CAPACITOR DISCHARGE CIRCUIT AND POWER CONVERTER

The present disclosure discloses a capacitor discharge circuit and a power converter. The capacitor discharge circuit includes a detection circuit and a discharge loop; the detection circuit has input ends electrically connected with input ends of an AC power supply, and an output end outputting a discharge detection signal to an input end of the discharge loop; the discharge loop is electrically connected with both ends of the capacitor that needs to be discharged and includes a switch unit and an energy consumption unit. When the AC power supply is disconnected, the discharge detection signal switches on the switch unit to conduct the discharge loop, such that the energy consumption unit discharges the capacitor that needs to be discharged. The present disclosure also provides a power converter including the capacitor discharge circuit. The present disclosure can reduce the power consumption caused by discharging the capacitor that needs to be discharged. 1. A capacitor discharge circuit , two ends of a capacitor that needs to be discharged being electrically connected with two input ends of an AC power supply respectively , and the capacitor discharge circuit being electrically connected with both ends of the capacitor that needs to be discharged , wherein the capacitor discharge circuit includes a detection circuit and a discharge loop;wherein:the detection circuit has input ends electrically connected with the input ends of the AC power supply, and an output end outputting a discharge detection signal to an input end of the discharge loop;the discharge loop is electrically connected with both ends of the capacitor that needs to be discharged, wherein the discharge loop includes a switch unit and an energy consumption unit, and ON or OFF of the switch unit is controlled by the discharge detection signal output from the output end of the detection circuit; andwhen the AC power supply is disconnected, the discharge detection signal output from the detection ...

VOLTAGE SWITCHING CIRCUIT AND POWER ADAPTER

Disclosed are a voltage switching circuit and a power adapter having the same. The voltage switching circuit comprises a first switching circuit having a first terminal receiving a first voltage from a first converter, and a second switching circuit having a first terminal receiving a second voltage from a second converter. Second terminals of the first and second switching circuits are electrically connected to form a switching terminal for outputting an output voltage. When the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off and then the second switching circuit is controlled to be turned on, and when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off. 1. A voltage switching circuit , comprising:a first switching circuit comprising a first switch, and having a first terminal electrically connected to a first output terminal of a first converter and receiving a first voltage outputted from the first converter; anda second switching circuit comprising a second switch, and having a first terminal electrically connected to a second output terminal of a second converter and receiving a second voltage outputted from the second converter,wherein a second terminal of the first switching circuit is electrically connected to a second terminal of the second switching circuit to form a switching terminal for outputting an output voltage, andwherein when the output voltage is required to be switched from the first voltage to the second voltage, the first switching circuit is controlled to be turned off, and then the second switching circuit is controlled to be turned on such that the output voltage is switched to the second voltage, andwherein when a voltage at the first terminal of the second switching circuit is higher than a preset voltage, the second converter is shut down or kept off. ...

CONNECTOR PROTECTION METHOD AND SYSTEM

The present disclosure provides a connector protection method in which the connector is used to connect a first device and a second device, and the method includes, a first detection unit of the first device detects a first parameter of the first device; a first controller of the first device obtains a second parameter from the second device through the communication line in the connector; and the first controller determines whether the connector is faulty based on the first parameter and the second parameter. 1. A method for implementing fault protection of the connector between a first device and a second device , comprising:detecting, by a first detection unit of the first device, a first parameter of the first device;receiving, by a first controller of the first device, a second parameter from the second device through a communication line of the connector; anddetermining, by the first controller of the first device, whether there is a connector fault based on the first parameter and the second parameter.2. The method according to claim 1 , wherein the first device is a load and the second device is a power supply.3. The method according to claim 2 , wherein the first controller of the first device outputs a fault signal claim 2 , and the second device continues to supply power claim 2 , if a difference between the first parameter and the second parameter is greater than a first threshold and less than a second threshold.4. The method according to claim 2 , wherein the first controller of the first device generates a fault signal and transmits the fault signal to a second controller of the second device claim 2 , and the second controller controls the second device to stop supplying power claim 2 , if a difference between the first parameter and the second parameter is greater than a second threshold.5. The method according to claim 2 , wherein the second device is a power adapter and the connector is a USB type-C connector.6. The method according to claim 1 , ...

Power adapter and electronic device comprising the power adapter

The present invention discloses a power adapter and an electronic device comprising the same. The power adapter comprises a housing, which has a plurality of end faces. The power adapter further comprises a power inlet socket, which is provided on any of the plurality of end faces. The end face on which the power inlet socket is provided, at least another one of the plurality of end faces, and the power inlet socket are formed as one body integrally.

METHOD AND APPARATUS FOR CONTROLLING A FLYBACK CONVERTER

The present invention discloses a method and an apparatus for controlling a flyback converter, the flyback converter including a main switch, a transformer and an auxiliary switch. The method includes: obtaining a first voltage signal and a second voltage signal, the first voltage signal representing an input voltage of the flyback converter, and the second voltage signal representing an output voltage of the flyback converter; controlling turn-on of the auxiliary switch, wherein the turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal; and turning on the main switch at ZVS condition, wherein the main switch is turned on at the time delayed for a duration of a dead time after turning off of the auxiliary switch. 1. A method for controlling a flyback converter , the flyback converter including a main switch , a transformer and an auxiliary switch , the method comprising:obtaining a first voltage signal and a second voltage signal, the first voltage signal representing an input voltage of the flyback converter, and the second voltage signal representing an output voltage of the flyback converter;controlling turn-on of the auxiliary switch, wherein the turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal; andturning on the main switch at ZVS condition, wherein the main switch is turned on at the time delayed for a duration of a dead time after turning off of the auxiliary switch.2. The control method according to claim 1 , wherein the auxiliary switch is an active clamp switch for the flyback converter.3. The control method according to claim 1 , wherein the transformer further comprises an auxiliary winding claim 1 , andthe auxiliary switch is connected to the auxiliary winding in series.4. The control method according to claim 1 , wherein the flyback converter further comprises a synchronous rectifier switch claim 1 , ...

CONTROL METHOD AND CONTROL APPARATUS FOR FLYBACK CIRCUIT

The present invention discloses a control method and a control apparatus for a Flyback circuit. The Flyback circuit includes a primary switch, a secondary rectifier unit, a transformer and an output capacitor. The secondary rectifier unit includes a first terminal and a second terminal, which are electrically connected to the transformer and the output capacitor, respectively. In the control method for a Flyback circuit, after the secondary rectifier unit is controlled to be turned on once or twice according to the input voltage and/or output power of the Flyback, the primary switch is turned on to achieve the zero-voltage-switching. According to the invention, the zero-voltage-switching (ZVS) of the primary switch can be achieved under the entire input voltage range and the entire load range without adding additional power devices. 1. A control method for a Flyback circuit , the Flyback circuit including a primary switch , a secondary rectifier unit , a transformer and an output capacitor , wherein the secondary rectifier unit includes a first terminal and a second terminal , which are electrically connected to the transformer and the output capacitor , respectively , characterized by turning on the primary switch after the secondary rectifier unit is controlled to be turned on once or twice according to an input voltage or according to the input voltage and an output power of the Flyback , to achieve a zero-voltage-switching of the primary switch.2. The control method according to claim 1 , characterized by further comprising the following steps: comparing the input voltage of the Flyback circuit with a first threshold value; when the input voltage is greater than or equal to the first threshold value claim 1 , generating a judging result that the input voltage is high; and claim 1 , according to the judging result claim 1 , controlling the secondary rectifier unit to be turned on twice before the primary switch is turned on.3. The control method according to ...

Switching power supply and method for controlling voltage of bulk capacitor in the same

A switching power supply and a method for controlling a voltage of a Bulk capacitor in the switching power supply are provided. The switching power supply includes: a rectifying unit; a Bulk capacitor; a converter; a monitoring circuit; a control circuit, controlling discharging of the Bulk capacitor, being configured to perform controls such that the voltage across the Bulk capacitor maintains the peak value after the Bulk capacitor having been charged to a peak value of AC voltage, and to perform controls such that the Bulk capacitor discharges from a peak value when the instantaneous absolute value of the AC voltage is smaller than or equal to the preset voltage. Using the technical solution of the present disclosure, a discharging time of the Bulk capacitor can be shortened, and thereby the volume of the Bulk capacitor is reduced. Consequently, it is conducive to realize miniaturization of the switching power supply.

Pcb winding transformer and coil board thereof

The present disclosure discloses a PCB winding transformer and a coil board thereof. The PCB winding transformer comprises a coil board and a magnetic core. The coil board includes a primary coil and a secondary coil. The primary coil and the secondary coil are wound around a magnetic core column of the magnetic core. At least two via holes which correspond to the primary coil and the secondary coil respectively are disposed in the coil board. In the primary coil and the secondary coil, the via hole corresponding to the coil with less turns is disposed between an inner side of the coil with more turns and the magnetic core column.

Pcb winding transformer

The present disclosure discloses a PCB winding transformer. The PCB winding transformer includes a magnetic core and a coil board with a multilayer structure. The coil board includes a primary coil and a secondary coil wound around a magnetic core column of the magnetic core. The secondary coil is located in a first layer and a last layer, and the primary coil is located in intermediate layers. The number of turns of the secondary coil is less than that of the primary coil. At least one via hole for connecting the first layer and the last layer of the secondary coil is disposed in the coil board between an inner side of the primary coil and the magnetic core column.

POWER CONVERTER AND METHOD OF CONTROL THEREOF

A flyback power converter includes a hybrid clamp circuit and a corresponding power management unit that substantially optimizes the performance of the flyback power converter in its entire line and load ranges. The clamp circuit, which is connected in parallel to a primary winding of the flyback transformer, includes a parallel combination of a capacitor and resistor that is connected in series with a parallel combination of a switch and a diode. By sensing the operating conditions, the power management circuit configures the clamp circuit either as a passive clamp or as an active clamp. In the passive-clamp configuration, the switch is kept turned off. In the active-clamp configuration, the switch operates with pulse-width modulation (PWM) which enables ZVS turn-on of the main switch. 1. A flyback power converter receiving an input voltage and providing an output voltage and an output current to a load , comprising:a transformer having a primary winding and a secondary winding, the output voltage and the output current being provided to the load from the secondary winding;a first switch coupled to the primary winding, the first switch coupling the input voltage across the primary winding when the first switch is turned on;a clamp circuit comprising first and second parallel circuits coupled to each other in series, wherein the first parallel circuit comprises a second switch and a clamp diode, and wherein the second parallel circuit comprises a clamp capacitor and a clamp resistor, such that the clamp circuit to provide an active clamp or a passive clamp, according to whether the second switch is closed or open;a controller for regulating the output voltage or the output current by periodically turning on and off the first switch; anda power management unit for enabling or disabling switching of the second switch based on the flyback power converter's operating conditions.2. (canceled)3. The flyback power converter of claim 1 , wherein the power management unit ...

Power adapter

A power adapter, includes: a transformer, including a primary winding and a secondary winding; a primary circuit, including a primary main switch, electrically coupled to the primary winding; a secondary circuit, including a first switch unit and a second switch unit; a first end of the first switch unit and a first end of the second switch unit are coupled to the secondary winding of the transformer, and a second end of the first switch unit and a second end of the second switch unit connected to a first output port and a second output port, respectively; a control circuit, configured to detect output voltages of the first output port and the second output port, and controlling the primary main switch, the first switch unit and the second switch unit to adjust the output voltages of the first output port and the second output port.

Magnetic device and method of manufacturing the same

A magnetic device comprises two base portions and magnetic pillars, wherein each of the two base portions has a first surface and the two first surfaces are faced to each other, and the magnetic pillars are disposed between the two first surfaces along a first direction, wherein, in the first direction, two of the magnetic pillars located at the outermost side of the base portion are a first corner pillar and a second corner pillar respectively, n of the magnetic pillars having the same cross-sectional area and located at the center position of the base portion are n center pillars, and cross-sectional area of the magnetic pillars are gradually increased from the first corner pillar to the center pillar closest to the first corner pillar, and from the second corner pillar to the center pillar closest to the second corner pillar.

CONTROL DEVICE, CONTROL METHOD OF POWER CONVERTER AND SWITCHING POWER SUPPLY

The disclosure relates to a control device, a control method of a power converter and a switching power supply using the control device. The control device of the power converter includes: a first control unit, which is coupled to the power converter to detect an output voltage of the power converter and is configured to generate a first control signal based on the output voltage; a variable resistor unit, which is connected to an output terminal of the first control unit to receive the first control signal and is configured to generate a resistance value based on the first control signal; and a second control unit, which is connected to the variable resistor unit and is configured to output a second control signal in order to control operations of a switch unit of the power converter. 1. A control device of a power converter , wherein the power converter comprises a switch unit , wherein the control device comprises:a first control unit, which is coupled to the power converter to detect an output voltage of the power converter and is configured to generate a first control signal based on the output voltage;a variable resistor unit, which is connected to an output terminal of the first control unit and is configured to generate a resistance value based on the first control signal; anda second control unit, which is connected to the variable resistor unit and is configured to output a second control signal to the switch unit in order to control operations of the switch unit.2. The control device according to claim 1 , wherein the power converter is a flyback converter claim 1 , a LLC resonant converter claim 1 , a forward converter claim 1 , a push-pull converter or a boost converter.3. The control device according to claim 1 , wherein the variable resistor unit comprises:a first switch element configured so that a control terminal thereof receives the first control signal, and the first switch element is configured to be turned on or off based on the first control ...

WINDING ASSEMBLY AND MAGNETIC ELEMENT

Present disclosure provides a winding assembly and a magnetic element. The winding assembly comprises a substrate with a central hole and a first winding disposed in the substrate, the first winding comprising two layers of coil wound around a central hole in the substrate; wherein, a second end of a first layer of coil away from the central hole is connected to a first end of a second layer of coil away from the central hole, and a first end of the first layer of coil close to the central hole and a second end of the second layer of coil close to the central hole serve as a starting-end and a finishing-end of the first winding, respectively. The magnetic element comprises a winding assembly and a magnetic core, and the winding assembly is sleeved on a magnetic leg of the magnetic core. 1. A winding assembly , comprising:a substrate with a central hole;a first winding disposed in the substrate, the first winding comprising two layers of coil wound around a central hole in the substrate; wherein,a second end of a first layer of coil away from the central hole is connected to a first end of a second layer of coil away from the central hole; anda first end of the first layer of coil close to the central hole and a second end of the second layer of coil close to the central hole serve as a starting-end and a finishing-end of the first winding respectively.2. The winding assembly according to claim 1 , wherein claim 1 , the second end of the first layer of coil away from the central hole and the first end of the second layer of coil away from the central hole are connected through a via hole.3. The winding assembly according to claim 1 , wherein claim 1 , the first end of the first layer of coil close to the central hole and the second end of the second layer of coil close to the central hole are connected to an external circuit or device.4. The winding assembly according to claim 1 , wherein claim 1 , the first layer of coil and the second layer of coil are formed by ...

CONTROL DEVICE AND CONTROL METHOD

A control device applied to a flyback converter including an auxiliary switch includes: a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero-voltage switching of a primary-side switch of the flyback converter with variable outputs. 1. A control device , applied to a flyback converter comprising an auxiliary switch , comprising:a current detector configured to detect an amplitude of a current of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; anda comparator controller configured to compare the amplitude of the negative magnetizing current obtained by the current detector with a reference value, and turn off the auxiliary switch according to a comparison result.2. The control device according to claim 1 , wherein the auxiliary switch comprises any one selected from a group comprising a synchronous rectifier claim 1 , a clamp switch claim 1 , a switch connected in parallel with a secondary-side rectifier of the flyback converter claim 1 , and a switch connected in series with an auxiliary winding of the flyback converter.3. The control device according to claim 2 , wherein the auxiliary switch comprises the synchronous rectifier claim 2 , and the comparator controller is configured to detect the amplitude of the current of the flyback converter by detecting an amplitude of a current flowing through the synchronous rectifier by means of a current transformer claim 2 , a sampling resistor claim 2 , or on-state resistance of the synchronous rectifier.4. The control device according to claim 2 , wherein the ...

CONTROL DEVICE AND CONTROL METHOD

A control device, which is applied to a flyback converter including an auxiliary switch, includes: an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter; and an on-time controller, configured to output a control signal to turn on the auxiliary switch, and turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs. 1. A control device , applied to a flyback converter , the flyback converter comprising an auxiliary switch , the control device comprising:an on-time setter, configured to set an on-time threshold according to a reference value and an output voltage of the flyback converter; andan on-time controller, configured to output a control signal to turn on the auxiliary switch, and to turn off the auxiliary switch when on-time of the auxiliary switch reaches the on-time threshold.2. The control device according to claim 1 , wherein the flyback converter comprises a Resistor Capacitor Diode (RCD) clamp flyback converter or an active clamp flyback converter.3. The control device according to claim 1 , wherein the auxiliary switch comprises any one selected from a group comprising a synchronous rectifier claim 1 , a clamp switch claim 1 , a switch connected in parallel with a secondary-side rectifier of the flyback converter claim 1 , and a switch connected in series with an auxiliary winding of the flyback converter.4. The control device according to claim 1 , wherein the on-time controller is configured to output the control signal according to a timing start signal.5. The control device according to claim 4 , wherein the on-time controller comprises a timer and an auxiliary switch controller;wherein the timer is configured to receive the timing start signal, and generate a timing signal when ...

Control device and control method

A control device applied to a flyback converter including an auxiliary switch includes: an output voltage integrator, configured to integrate an output voltage of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller, configured to compare the obtained amplitude of the negative magnetizing current with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs.

CONVERTER AND METHOD FOR CONTROLLING THE SAME

A method for controlling converter such as a Flyback converter is disclosed. A load of the Flyback converter varies between zero and a peak value. The method includes: a load detecting step for detecting the load; and an operating mode control step for controlling the Flyback converter to switch between two or more of a continuous conduction mode, a valley conduction mode and a burst mode according to the load. A converter such as a Flyback converter is also provided. 1. A method for controlling a Flyback converter , comprising:a load detecting step for detecting a load at an output of the Flyback converter, wherein the load varies between zero and a peak value, the Flyback converter comprises a switch; andan operating mode control step for controlling the Flyback converter to switch between two or more of a continuous conduction mode, a valley conduction mode and a burst mode according to the detected load.2. The control method according to claim 1 , wherein the operating mode control step further comprises:a continuous conduction mode control sub-step for controlling the Flyback converter to switch to the continuous conduction mode when the load is not less than a first threshold;a valley conduction mode control sub-step for controlling the Flyback converter to switch to the valley conduction mode when the load is less than the first threshold and greater than a second threshold, the first threshold being greater than the second threshold; anda burst mode control sub-step for controlling the Flyback converter to switch to the burst mode when the load is not greater than the second threshold.3. The method of claim 1 , wherein claim 1 , the load detecting step comprises detecting the load by detecting an output voltage or an output current at the output of the Flyback converter.4. The method of claim 3 , wherein claim 3 , the load detecting step comprises detecting the load by detecting an output voltage or an output current at the output of the Flyback converter so ...

Flyback converter and control method thereof

A flyback converter includes: a transformer, including a primary winding and a secondary winding; a primary side switch electrically coupled to the primary winding; a feedback circuit, configured to detect an output voltage of a load and output a feedback voltage signal; a current detecting circuit, configured to sample current flowing through the primary side switch and output a current signal; and a control circuit, coupled to the feedback circuit and the current detecting circuit and configured to respectively receive the feedback voltage signal and the current signal, and output a switch control signal to the primary side switch; and wherein the control circuit configured to control a switching frequency of the primary side switch to increase with increase of an output power, and an increasing speed of the switching frequency to decrease with the increase of the output power.

METHOD AND APPARATUS FOR CONTROLLING A FLYBACK CONVERTER

The present invention discloses a method and an apparatus for controlling a flyback converter, the flyback converter including a main switch, a transformer, and an auxiliary switch. The method includes: obtaining a first voltage signal and a second voltage signal, the first voltage signal representing an input voltage of the flyback converter, and the second voltage signal representing an output voltage of the flyback converter; controlling turn-on of the auxiliary switch, wherein the turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal; and turning on the main switch at ZVS condition, wherein the main switch is turned on at the time delayed for a duration of a dead time after turning off of the auxiliary switch. 1. A method for controlling a flyback converter , the flyback converter including a main switch , a transformer , and an auxiliary switch , the method comprising:obtaining a first voltage signal and a second voltage signal, wherein the first voltage signal relates to an input voltage of the flyback converter, and the second voltage signal relates to an output voltage of the flyback converter;controlling turn-on of the auxiliary switch, wherein a turn-on time period of the auxiliary switch is determined according to the first voltage signal and the second voltage signal, wherein the turn-on time period of the auxiliary switch increases when a voltage of the first voltage signal is increasing and wherein the turn-on time period of the auxiliary switch increases when a voltage of the second voltage signal is decreasing; andturning on the main switch at zero voltage switching condition, wherein the main switch is turned on at a time delayed for a duration of a dead time after turning off of the auxiliary switch.3. The control method according to claim 1 , wherein the auxiliary switch is an active clamp switch for the flyback converter.4. The control method according to claim 1 , wherein ...

Detecting method for an operating state of a power supply and a detecting apparatus

The present application provides a detecting method of an operating state of a power supply and a detecting apparatus, where the power supply includes a primary circuit, a transformer and a secondary circuit. The secondary circuit includes a secondary current detecting unit, a temperature detecting unit and a secondary controlling unit. Firstly the secondary current detecting unit detects a current value of the secondary circuit, then the secondary controlling unit compares the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature detecting unit detects a temperature value of the power supply and the secondary controlling unit determines the operating state of the power supply according to the acquired temperature value of the power supply.

Control device, control method of power converter and switching power supply

Converter and method for controlling the same

A method for controlling converter such as a Flyback converter is disclosed. A load of the Flyback converter varies between zero and a peak value. The method includes: a load detecting step for detecting the load; and an operating mode control step for controlling the Flyback converter to switch between two or more of a continuous conduction mode, a valley conduction mode and a burst mode according to the load. A converter such as a Flyback converter is also provided.

Control device and control method

A control device applied to a flyback converter including an auxiliary switch includes: an output voltage integrator, configured to integrate an output voltage of the flyback converter to obtain an amplitude of a negative magnetizing current of the flyback converter; and a comparator controller, configured to compare the obtained amplitude of the negative magnetizing current with a reference value, and turn off the auxiliary switch according to a comparison result. According to the present disclosure, it is able to achieve zero voltage switching of a primary-side switch of the flyback converter with variable outputs.

Power adapter

Switching power supply and method for controlling voltage of bulk capacitor in the same

A switching power supply and a method for controlling a voltage of a Bulk capacitor in the switching power supply are provided. The switching power supply includes: a rectifying unit (23); a Bulk capacitor (27, C_bulk); a converter (24); a monitoring circuit (25); a control circuit (26), controlling discharging of the Bulk capacitor, being configured to perform controls such that the voltage across the Bulk capacitor maintains the peak value after the Bulk capacitor having been charged to a peak value of AC voltage, and to perform controls such that the Bulk capacitor discharges from a peak value when the instantaneous absolute value of the AC voltage is smaller than or equal to the preset voltage. Using the technical solution of the present disclosure, a discharging time of the Bulk capacitor can be shortened, and thereby the volume of the Bulk capacitor is reduced. Consequently, it is conducive to realize miniaturization of the switching power supply.

Adapter and control method thereof

The present disclosure relates to an adapter. The adapter includes an input port (IN), a first output port (OUT1) and a second output port (OUT2), and the adapter further includes: a rectifier circuit (110) having an input terminal being connected to the input port (IN) of the adapter; a bus capacitor (120) connected to an output terminal of the rectifier circuit in parallel; a first flyback converter (131) having an input terminal connected to the bus capacitor and an output terminal coupled to the first output port (OUT1); and a second flyback converter (132) having an input terminal connected to the bus capacitor and an output terminal coupled to the second output port (OUT2).

Power converter and method of control thereof

A flyback power converter includes a hybrid clamp circuit and a corresponding power management unit that substantially optimizes the performance of the flyback power converter in its entire line and load ranges. The clamp circuit, which is connected in parallel to a primary winding of the flyback transformer, includes a parallel combination of a capacitor and resistor that is connected in series with a parallel combination of a switch and a diode. By sensing the operating conditions, the power management circuit configures the clamp circuit either as a passive clamp or as an active clamp. In the passive-clamp configuration, the switch is kept turned off. In the active-clamp configuration, the switch operates with pulse-width modulation (PWM) which enables ZVS turn-on of the main switch.

A power adapter

A power adapter, includes: a transformer (TR), including a primary winding and a secondary winding; a primary circuit, including a primary main switch (Q1), electrically coupled to the primary winding; a secondary circuit, including a first switch unit (SI) and a second switch unit (S2); a first end of the first switch unit and a first end of the second switch unit are coupled to the secondary winding of the transformer, and a second end of the first switch unit and a second end of the second switch unit connected to a first output port (OUT1) and a second output port (OUT2), respectively; a control circuit (340), configured to detect output voltages of the first output port and the second output port, and controlling the primary main switch, the first switch unit and the second switch unit to adjust the output voltages of the first output port and the second output port.

Hybrid flyback circuit and control method

A hybrid flyback circuit is provided and includes an upper switch, a lower switch, a transformer, a resonant circuit, a current sampling circuit and a control unit. The control unit includes an output voltage feedback unit, a peak current comparison unit controlling the upper switch to turn off when a sampling voltage corresponding to the current sampling signal is equal to the first voltage feedback signal, a first dead time delay unit controlling the lower switch to turn on after a first dead time starting from the turn-off time of the upper switch, a negative peak current feedback unit for generating a second voltage feedback signal, a conduction control unit controlling the lower switch to turn off, and a second dead time delay unit controlling the upper switch to turn on after a second dead time starting from the turn-off time of the lower switch.

Hybrid flyback circuit and control method

A hybrid flyback circuit is provided and includes an upper switch, a lower switch, a transformer, a resonant circuit, a current sampling circuit and a control unit. The control unit includes an output voltage feedback unit, a peak current comparison unit controlling the upper switch to turn off when a sampling voltage corresponding to the current sampling signal is equal to the first voltage feedback signal, a first dead time delay unit controlling the lower switch to turn on after a first dead time starting from the turn-off time of the upper switch, a negative peak current feedback unit for generating a second voltage feedback signal, a conduction control unit controlling the lower switch to turn off, and a second dead time delay unit controlling the upper switch to turn on after a second dead time starting from the turn-off time of the lower switch.

Detecting method for an operating state of a power supply and a detecting apparatus

The present application provides a detecting method of an operating state of a power supply and a detecting apparatus, where the power supply includes a primary circuit, a transformer and a secondary circuit. The secondary circuit includes a secondary current detecting unit, a temperature detecting unit and a secondary controlling unit. Firstly the secondary current detecting unit detects a current value of the secondary circuit, then the secondary controlling unit compares the current value of the secondary circuit with a preset current threshold. When the current value of the secondary circuit is less than or equal to the preset current threshold, the temperature detecting unit detects a temperature value of the power supply and the secondary controlling unit determines the operating state of the power supply according to the acquired temperature value of the power supply.

PCB winding transformer and coil board thereof

The present disclosure discloses a PCB winding transformer and a coil board thereof. The PCB winding transformer comprises a coil board and a magnetic core. The coil board includes a primary coil and a secondary coil. The primary coil and the secondary coil are wound around a magnetic core column of the magnetic core. At least two via holes which correspond to the primary coil and the secondary coil respectively are disposed in the coil board. In the primary coil and the secondary coil, the via hole corresponding to the coil with less turns is disposed between an inner side of the coil with more turns and the magnetic core column.

Totem-pole power factor correction circuit

A totem-pole PFC circuit is provided. The totem-pole PFC circuit includes an inductor, a first bridge arm and a second bridge arm. The first bridge arm includes a first switch and a second switch connected in series. A first middle node connected between the first and second switches is coupled to a first terminal of an AC power source through the inductor. The second bridge arm connected to the first bridge arm in parallel includes a third switch and a fourth switch connected in series. A second middle node connected between the third and fourth switches is coupled to a second terminal of the AC power source. When a polarity of the AC power source is changed, a change time of a voltage on the second middle node is longer than a preset time not less than 20 μs.

電力変換器及びその制御方法

【課題】全ライン及び負荷範囲にわたってフライバックコンバータの性能を最適化する。【解決手段】フライバック電力変換器２００は、ハイブリッド型クランプ回路２２０と、それに対応する、フライバック電力変換器の性能をその全ライン及び負荷範囲で大幅に最適化する電力管理ユニット２６２とを備える。クランプ回路は、フライバックトランス２０１の一次巻線に並列に接続されて、スイッチ２０５及びダイオード２０４の並列組み合わせに対して直列に接続されたコンデンサ２０２及び抵抗２０３の並列組み合わせを含む。動作条件を検出することにより、電力管理ユニットは、クランプ回路をパッシブクランプまたはアクティブクランプのいずれかとして構成する。パッシブクランプ構成では、スイッチはオフに、アクティブクランプ構成ではメインスイッチのＺＶＳターンオンを可能にするパルス幅変調（ＰＷＭ）制御下でオンオフされる。【選択図】図２

Converter adaptable to wide range output voltage and control method thereof

The invention discloses a converter adaptable to a wide range output voltage and a control method thereof. The converter comprises a PWM half-bridge circuit. The control method comprises the steps of: controlling the PWM half-bridge circuit to enter into a discontinuous conduction mode by regulating a switching frequency; when the PWM half-bridge circuit is operated in the discontinuous conduction mode, oscillation occurs among the output inductor, a magnetizing inductor of the transformer and a parasitic capacitor of the PWM half-bridge circuit, and when a center point voltage of the primary switching bridge arm reaches a valley or a peak, turning on the corresponding power switch. The invention reduces switching loss by controlling the corresponding power switch in the PWM half-bridge circuit to turn on when a voltage across the power switch is oscillated to valley.

Magnetic core

Magnetic core

Flyback circuit and control method of clamping switch of flyback circuit

A flyback circuit and a control method of a clamping switch of the flyback circuit are provided. The flyback circuit includes a transformer, a main switch, a clamping capacitor, a clamping switch, and a secondary rectifier unit. The transformer includes primary and secondary windings with a turns ratio of K. The main switch and the primary winding are connected in series to receive an input voltage. The clamping switch and the clamping capacitor are connected in series and then connected to the primary winding in parallel. The secondary rectifier unit and the secondary winding are connected in series to provide an output voltage to a load. The control method includes: when a product of K and the output voltage is greater than or equal to the input voltage, controlling the clamping switch to turn on M times during N consecutive switching cycles of the main switch, where 1=<M<N.

Winding assembly and magnetic assembly

The present invention provides a winding assembly and a magnetic assembly. The winding assembly comprises a first coil and a circuit board, and the first coil is embedded inside the circuit board; wherein the first coil comprises a conductive wire with at least one turn, and a height of the conductive wire in a direction perpendicular to the circuit board is not less than a width of the conductive wire in a direction parallel to the circuit board. The magnetic assembly comprises a first winding assembly and a magnetic core; wherein the first winding assembly comprises a first coil and a first circuit board, and the first coil comprises a conductive wire with at least one turn, the first coil is embedded inside the first circuit board, the first winding assembly is assembled with the magnetic core.

Converter adaptable to wide range output voltage and control method thereof

The application discloses a converter adaptable to a wide range output voltage and a control method thereof. The converter includes a PWM half-bridge circuit. The control method includes: causing the PWM half-bridge circuit to enter into a DCM by regulating a switching frequency; in each switching period, extending conduction time or turning on a corresponding synchronous rectifier once again for a predetermined time before the first power switch and the second power switch are turned on, to realize zero voltage switching (ZVS) of the first power switch and the second power switch. The application realizes ZVS of the primary power switches, thereby reducing loss.

Flyback power converter and control method thereof

A control method for a flyback power converter is provided. Firstly, a flyback power converter is provided. The flyback power converter includes a transformer, a leakage inductance energy recovery circuit and a control unit. Then, a delayed turn-off time period is defined by the control unit. Then, a detection signal related to a current flowing through the leakage inductance energy recovery circuit is detected. If the detection signal is greater than or equal to a first set value, a switch element of the leakage inductance energy recovery circuit is turned on. If the detection signal is lower than or equal to a second set value, the second switch element is turned off after the delayed turn-off time period.

Winding assembly and magnetic element

Present disclosure provides a winding assembly and a magnetic element. The winding assembly includes a circuit board with a central hole and a first winding wound around the central hole in the circuit board; the first winding includes N turns of coil on at least two wiring layers; a second end of at least one turn of coil on a first wiring layers is connected to a first end of next turn of coil at corresponding position on a second wiring layer of the circuit board. The magnetic element includes a magnetic core and a winding assembly sleeved on a magnetic leg.

Winding assembly and magnetic assembly

Switching power converter and control method thereof

A switching power converter and a control method thereof are provided. First, a switching power converter is provided. The switching power converter includes a main switch and an auxiliary circuit electrically connected in parallel to the main switch, and the auxiliary circuit includes an auxiliary switch and an auxiliary capacitor electrically connected in series. Afterwards, a load state of the switching power converter is detected. When the load state of the switching power converter is light, the auxiliary switch is controlled to turn off for maintaining a capacitance of a first equivalent capacitor between a drain and a source of the main switch at a low threshold. When the load state of the switching power converter is heavy, the auxiliary switch is controlled to turn on for maintaining the capacitance of the first equivalent capacitor at a high threshold.

Winding assembly and magnetic element

Present disclosure provides a winding assembly and a magnetic element. The winding assembly includes a circuit board with a central hole and a first winding wound around the central hole in the circuit board; the first winding includes N turns of coil on at least two wiring layers; a second end of at least one turn of coil on a first wiring layers is connected to a first end of next turn of coil at corresponding position on a second wiring layer of the circuit board. The magnetic element includes a magnetic core and a winding assembly sleeved on a magnetic leg.

Power adapter with limited power source function and control method thereof

A power adapter includes a transformer, an output terminal, a secondary side circuit and a secondary side controller including an operational amplifier. The secondary side circuit includes a first switch, a second switch and a sampling resistor. The first switch is connected with a secondary winding of the transformer and the second switch. The second switch is connected with the output terminal. The sampling resistor is connected between the secondary winding and the output terminal for acquiring a sampling voltage. The operational amplifier generates a voltage difference value according to the result of comparing a reference voltage value with a feedback voltage value. When the sampling voltage is lower than a first voltage level and the voltage difference value is greater than a second voltage level, the second switch is turned off under control of the secondary side controller.

Power factor correction circuit

The present invention discloses a power factor correction circuit. The power factor correction circuit includes: a first bridge arm having a first switch and a second switch; a second bridge arm having a third switch and a fourth switch; a first inductor and a second inductor; a first capacitor and/or a second capacitor connected with a common point between the second inductor and the first inductor; and a third capacitor and/or a fourth capacitor, the third capacitor connected in parallel to the third switch based on an arrangement of the second capacitor and having a capacitance value same as that of the second capacitor, the fourth capacitor connected in parallel to the fourth switch based on an arrangement of the first capacitor and having a capacitance value same as that of the first capacitor.

Totem-pole power factor correction circuit

A totem-pole PFC circuit is provided. The totem-pole PFC circuit includes an inductor, a first bridge arm and a second bridge arm. The first bridge arm includes a first switch and a second switch connected in series. A first middle node connected between the first and second switches is coupled to a first terminal of an AC power source through the inductor. The second bridge arm connected to the first bridge arm in parallel includes a third switch and a fourth switch connected in series. A second middle node connected between the third and fourth switches is coupled to a second terminal of the AC power source. When a polarity of the AC power source is changed, a change time of a voltage on the second middle node is longer than a preset time not less than 20 μs.

Charging system and control method

The present disclosure provides a control method of a charging system. The control method includes: providing a charging chip, wherein the charging chip is configured to charge a chargeable device, and the charging chip performs a wake-up task with a wake-up period during a standby mode; performing a plurality of wake-up subtasks in the wake-up task; and according to the priority of each of the plurality of wake-up subtasks, setting a corresponding working cycle of each wake-up subtasks, wherein the charging chip performs each of the wake-up subtasks with the corresponding working cycle, and the wake-up subtasks with different priorities have different working cycles.

Flyback power converter and control method thereof

A flyback power converter includes a transformer, a voltage clamping circuit, a main switch element and a control circuit. The voltage clamping circuit includes a first capacitor and a clamping switch element. The first capacitor is electrically connected with a primary winding of the transformer. The clamping switch element is electrically connected between the capacitor and the primary winding. The control circuit detects a capacitor voltage of the first capacitor and a current flowing through the clamping switch element. If the capacitor voltage is greater than a reference voltage, the clamping switch element is turned on. If the capacitor voltage is not greater than the reference voltage and the current flowing through the clamping switch element is lower than a reference current value, the clamping switch element is turned off.

Power conversion circuit and power supply device

The invention discloses a power conversion circuit and a power supply device. The power conversion circuit is applied to a power supply device, comprising: an AC/DC conversion circuit, wherein a DC side of the AC/DC conversion circuit has a first reference potential point; a first common-mode inductor; a DC/DC conversion circuit including a primary circuit having a second reference potential point, a secondary circuit and a transformer; wherein a first terminal of the first common-mode inductor is connected to the DC side of the AC/DC conversion circuit, and a second terminal of the first common-mode inductor is connected to the primary circuit of the DC/DC conversion circuit; the first reference potential point or the second reference potential point is connected to an electric field shield.

Control method and control apparatus for flyback circuit

The present invention discloses a control method and a control apparatus for a Flyback circuit. The Flyback circuit includes a primary switch, a secondary rectifier unit, a transformer and an output capacitor. The secondary rectifier unit includes a first terminal and a second terminal, which are electrically connected to the transformer and the output capacitor, respectively. In the control method for a Flyback circuit, after the secondary rectifier unit is controlled to be turned on once or twice according to the input voltage and/or output power of the Flyback, the primary switch is turned on to achieve the zero-voltage-switching. According to the invention, the zero-voltage-switching (ZVS) of the primary switch can be achieved under the entire input voltage range and the entire load range without adding additional power devices.

Switching power supply and method for controlling voltage of bulk capacitor in the switching power supply

A switching power supply includes: a rectifying unit; a Bulk capacitor; a converter; a monitoring circuit; a control circuit, controlling discharging of the Bulk capacitor, being configured to perform controls such that the voltage across the Bulk capacitor maintains the peak value after the Bulk capacitor having been charged to a peak value of AC voltage, and to perform controls such that the Bulk capacitor discharges from a peak value when the instantaneous absolute value of the AC voltage is smaller than or equal to the preset voltage. A method for controlling a voltage of a Bulk capacitor in the switching power supply includes detecting an instantaneous absolute value of the AC voltage; comparing the detected instantaneous absolute value of the AC voltage with a preset voltage; and controlling discharging and charging state of the Bulk capacitor according to comparison results.

Control device and control method of power converter and switching power supply using the same

The disclosure relates to a control device, a control method of a power converter and a switching power supply using the control device. The control device of the power converter includes: a first control unit, which is coupled to the power converter to detect an output voltage of the power converter and is configured to generate a first control signal based on the output voltage; a variable resistor unit, which is connected to an output terminal of the first control unit to receive the first control signal and is configured to generate a resistance value based on the first control signal; and a second control unit, which is connected to the variable resistor unit and is configured to output a second control signal in order to control operations of a switch unit of the power converter.