Control circuit and method for flyback converter

The invention relates to a control circuit of a flyback converter. The flyback converter comprises a transformer and a power switch connected with the primary side of the transformer. The control circuit switches the power switch to convert an input voltage of the transformer into an output voltage. The control circuit comprises a sampling and sustain circuit, a compensation circuit and a pulse width modulation circuit and is characterized in that the sampling and sustain circuit is used for obtaining the variable quantity of a sensing signal in the predetermined time, and the sensing signal is the function of the input voltage; the compensation circuit compensates a first feedback signal with the variable quantity of a inductance current signal to generate a second feedback signal changing with the input voltage, and the first feedback signal is the function of the output voltage; and the pulse width modulation circuit is used for determining the working time of the power switch according ...

Protective device and method of power source convertor

The invention provides a protective device of power source convertor. The power source convertor uses a PWM controller to generate a driver output to modulate duty ratio of the power source convertor; the PWM controller uses a current sensing input to implement current-limiting or power limit protecting function; the protective device comprises a comparer, a fixed time interval generator, a gate circuit and a time delay logic circuit, wherein, the comparer compares the current sensing input with a reference voltage to trigger a signal indicating zero sensing current; the fixed time interval generator generates a fixed time interval; the gate circuit shields the signal indicating zero sensing current in the period when the fixed time interval or the driver output is closed, is provided with an output for generating a signal indicating failure; and the time delay logic circuit is connected with the output of the gate circuit and closes the driver output after the signal indicating failure ...

Hospital service system and method

The invention discloses a hospital service system which comprises a plurality of department computers distributed in departments of a hospital, an HIS system, a PACS system, a report acquisition terminal, a cloud server and a digital report card, wherein the HIS system is connected with the department computers and the PACS system through the network; each department computer, the HIS system, the PACS system and the report acquisition terminal are connected with the cloud server through the hospital network; the report acquisition terminal accesses the cloud server according to patients' information in the digital report card and writes patents' inspection reports in the cloud server into the digital report card; communication between the department computers and the digital report card is established. By means of a service method of the hospital service system, all the treatment results and/ or prescriptions and inspection reports of patients are transmitted to the cloud server to be processed ...

Power supply management control device with reset latch protection function

The invention relates to a power supply management control device with reset latch protection function having the characteristics of remote control function, multiple protection function and PWM built-in. The control device can turn off a latch converter when error conditions such as over-voltage, under-voltage or over-power occur. However, under-voltage and over-power protection also occur when the input voltage Vin is decreased since AC interruption or input voltage is removed. Therefore, the invention also provides a device for resetting latch protection by sensing the input voltage Vin and the output voltage Vo.

Fast output short-circuit protection device and method used at primary side of semi-resonant converter

The invention discloses a fast output short-circuit protection device used at the primary side of a semi-resonant converter. The semi-resonant converter comprises a power switch which is switched by a control signal. The fast output short-circuit protection device is characterized by comprising a valley value detector and an output short-circuit judgment circuit, wherein the valley value detector is connected with the power switch and is used for detecting the voltage valley value of the power switch so as to generate a valley value signal, and the output short-circuit judgment circuit is connected with the valley value detector and is used for sending out a fault signal when the valley value signal is not received in an endurable period of time. The fast output short-circuit protection device and method used at the primary side of a semi-resonant converter provided by the invention have the advantage of rapid response when the semi-resonant converter is in an output short circuit state ...

Inspection report pushing system and method

The invention discloses an inspection report pushing system which comprises an image workstation, an HIS (hospital information system) and report acquisition equipment. The HIS is connected with the image workstation. The report acquisition equipment is provided with a controller, a card reader, a scanner and a graphic display. The graphic display is connected with the card reader and the scanner. The card reader and the scanner are connected to the controller. The HIS transmits an inspection report to a portable report card for saving according to the instruction of the controller. The portable report car is connected to the card reader in an inserted manner. The HIS is connected with the controller. The system has the advantages that a hospital only needs to complete the inspection report of a patient and saves the same in the HIS, follow-up inspection reports are completed by the pushing system, extra operators are not needed, manpower investment is reduced, whether to acquire the inspection ...

Output current sensing device and method used in primary side of flyback converter

Inverted high-pressure liquid storage tank for new energy vehicle

The invention discloses an inverted high-pressure liquid storage tank for a new energy vehicle. An inlet and an outlet are formed in the cover, the cover is arranged at the lower end of the tank body, a central pipe and an air outlet pipe are arranged in the tank body, the lower end of the central pipe is connected with the inlet, a first sealing assembly is arranged at the joint, the upper end of the central pipe extends towards the upper side of the tank body, a baffle is arranged on the central pipe in a sleeving mode, and a through hole is formed in the baffle. A drying bag is arranged on the central pipe, one end of the air outlet pipe is connected with the outlet, a second sealing assembly is arranged at the joint of the air outlet pipe and the air outlet pipe, a filter screen sleeve is arranged at the other end of the air outlet pipe, and a sealing ring is arranged between the filter screen sleeve and the air outlet pipe. Parts are more compact, the volume of parts in an automobile ...

Portable finger massage device

The utility model provides a portable finger massage device, the utility model relates to a massage device is for the problem of solving current finger massage equipment structure complicacy, function singleness, massage effect difference. A portable finger massage device which forms including controller, wire, elasticity hoop, hoop lid, flat linear oscillator, medical magnetite. Elasticity hoop can rely on elasticity to be returned to contract the joint on the finger, and the top of elasticity hoop is equipped with recess, inside flat linear oscillator, the medical magnetite of being equipped with of recess. The suitable for reading of recess is covered by the hoop cap seal. The controller passes through wire and flat linear oscillator electric connection, the wire goes out the elasticity hoop by the side by pass port of recess. The utility model is used for the finger massage.

Feedback circuit and control method for isolated power converter

The invention relates to a feedback circuit for an isolated power converter. The isolated power converter comprises a controller, and a power switch is switched so as to convert input voltage into output voltage. The feedback circuit is characterized by comprising a photo-coupler, a current-voltage converting circuit, a voltage source and a start-up circuit, wherein the current-voltage converting circuit is coupled to a second voltage source, and one of the first voltage and the second voltage is selected as a feedback signal for the controller. The feedback circuit and the control method for the isolated power converter have the advantage of ability of improving the underloading efficiency of the isolated power converter.

3D printer scraper device

The utility model discloses a scraper device of a 3D printer, which is characterized in that a front-back moving mechanism is arranged above a bracket, an up-down moving mechanism is connected with the front-back moving mechanism, and a scraper mechanism is arranged below the up-down moving mechanism; the first scraper and the second scraper are arranged below the up-down moving mechanism in parallel; the two ends of the first scraper are bent outwards, a filter screen is arranged in the middle of the first scraper, the bottom of the first scraper is perpendicular to the horizontal plane, a first blade made of a flexible material is arranged at the bottom of the first scraper, the thickness of the second scraper is 10 mm, and a second blade made of a tungsten steel material is arranged atthe bottom of the second scraper. The first scraper and the second scraper act in sequence, the printing quality is improved, the first scraper or the second scraper is directly detached and directlyreplaced ...

Temperature-compensation circuit for primary side feedback system and method of isolated power converter

The invention discloses a temperature-compensation circuit for a primary side feedback system and method of an isolated power converter. A forward bias voltage changing following the temperature change of a compensation diode which has a temperature characteristic as same as the temperature characteristic of an output diode is utilized to control an induced voltage of an auxiliary coil, so as to cancel out the change of an output voltage caused by the forward bias voltage changing following the temperature change of the output diode.

Examination and test report card for hospitals and application method thereof

The invention discloses an examination and test report card for hospitals. The examination and test report card for the hospitals comprises a card body, a chip and a plug interface, wherein the chip and the plug interface are embedded in the card body; the chip comprises a storage for storing examination and test reports and a data processor for reconstructing 3D medical images; the storage is connected with the data processor, and the data processor is used for conducting 3D medical reconstruction on the images transmitted by the storage. Since the chip has a large storage capacity and the memory function, diagnosis results of examinations and tests every time, all section images and all reconstructed 3D medical images can be stored in the chip; consequently, cost is lowered, and the information amount, the effect and the accuracy of the examination and test reports are guaranteed; besides, the examination and test report card for the hospitals is connected with a doctor workstation or ...

Flyback voltage regulator, control circuit thereof, primary side controller, secondary side controller

The invention provides a flyback voltage regulator which comprises a primary side coil, a secondary side coil, an auxiliary coil,a power switch coupled to the primary side coil, a primary side controller coupled to the auxiliary coil and the power switch, a diode which is coupled between the secondary side coil and a fixed potential terminal, a switch device which is coupled between the secondary side coil and the fixed potential terminal, and a secondary side controller which is coupled to the secondary side coil, the output voltage and the control end of the switch device. When current which flows through the secondary side coil is lower than a preset current value and output voltage is lower than a preset voltage value, the secondary side controller switches on the switch device such that the voltage of a second node coupled to the primary side controller is changed, if the voltage change of the second node exceeds a predetermined range, the primary side controller switches on the power ...

Leakage circuit and method for reducing power consumption of electromagnetic interference filer

The invention discloses a leakage circuit and method for reducing power consumption of an electromagnetic interference filer. An AC (alternating current) power supply connected with the electromagnetic interference filer is rectified to generate full-wave signals; and the full-wave signals control a leakage switch to build or cut off a leakage path. The leakage circuit and method can cut off the leakage path during the AC power supply supplies power, thereby reducing the power consumption of a leakage resistor.

Extraction method and application of secondary essence polysaccharide

The invention discloses an extraction method and application of two-essence polysaccharide. The extraction method of the two-essence polysaccharide comprises the following steps: S1, mixing Chinese wolfberry fruit powder and rhizoma polygonati powder, and adding a first ethanol solution for reflux treatment to obtain degreased medicinal material powder; and S2, adding water into the degreased medicinal material powder according to a material-liquid ratio of 1g: (10-30) mL, performing soaking and ultrasonic treatment, performing suction filtration, collecting filtrate, concentrating, adding a second alcohol-ethanol solution, performing alcohol precipitation treatment, collecting precipitate, and drying to obtain the secondary essence polysaccharide, tests show that the two-essence polysaccharide prepared by the invention has excellent anti-oxidation and anti-fatigue effects, and has wide prospects in the fields of health care products, cosmetics and the like. In addition, the polysaccharide ...

Feedback circuit and control method for isolated power converter

The invention relates to a feedback circuit for an isolated power converter which comprises a controller; and the controller switches a power switch to convert input voltage into output voltage. The feedback circuit is characterized by comprising a photo-coupler, a current/voltage converting circuit, a voltage source and a start-up circuit, wherein the current/voltage converting circuit is coupled with a second voltage source; and one of the first voltage and the second voltage is selected as a feedback signal for the controller. By using the feedback circuit and control method for the isolated power converter, the underloading efficiency of the isolated power converter can be improved.

Wafer classification method and correlated production method

The invention is classification method for a wafer, comprising the steps: receiving a wafer deposited by a thin film; detecting the height distribution of the wafer; and classifying the wafer to a corresponding type according to the height distribution.

Control circuit and method for flyback power converter

The invention relates to a control circuit for a flyback power converter. The power converter comprises a transformer connected with a power switch, wherein the power switch is switched by a control signal so as to enable the transformer to convert an input voltage into an output voltage. The control circuit comprises a compensation circuit and a pulse width modulation circuit. The control circuitis characterized in that the compensation circuit compensates a first feedback signal by a sawtooth wave to generate a second feedback signal, and the first feedback signal is the function of the output voltage; and the pulse width modulation circuit generates the control signal according to the second feedback signal and a sensing signal, and the sensing signal is the function of the current which passes through the power switch.

Nursing device based on wrist ankle skill of handling needles

The utility model provides a nursing device based on wrist ankle skill of handling needles, the utility model relates to a nursing device exists function singleness, the poor problem of massage health care effect for solving current nursing device based on wrist ankle skill of handling needles. A nursing device based on wrist ankle skill of handling needles which constitutes and to inhale the bowl including air pump, trachea, elastic cord, six. The top of inhaling the bowl is equipped with the siphunculus, and the siphunculus is equipped with the opening. The elastic cord is equipped with four wale equidistance location lines, and the equidistance is equipped with six through -holes on the elastic cord, the siphunculus reveals the elastic cord by the through -hole, it bonds with the elastic cord colloidality to inhale the bowl. The air pump links to each other with the siphunculus of inhaling bowl top through the trachea, and the siphunculus can be pegged graft in the trachea.

System and method for monitoring program

The invention relates to a system for monitoring program, which comprises a two-dimensional orthogonal diagram and a marker, wherein the two-dimensional orthogonal diagram is provided with a first shaft which is related to the wafer measurement value of a wafer, and a second shaft which is related to the program total value of a set program, and the two-dimensional orthogonal diagram is provided with a sealing and annular control limit inside; and the marker displays the program total value and the wafer measurement value in the two-dimensional orthogonal diagram.

Special bearing press mounting equipment for clutch driving disc

The invention discloses special bearing press mounting equipment for a clutch driving disc. The special bearing press mounting equipment comprises a base, a press mounting mold and a hydraulic system, wherein the hydraulic system is connected onto a fixing frame; the press mounting mold is connected with a piston rod of the hydraulic system; a circular disc seat capable of rotating is arranged on the base; one disc seat can be positioned right under the press mounting mold through rotating the circular disc seat; one side of an upright post is provided with a conveying mechanism capable of conveying a bearing into the press mounting mold; an inner mold of the press mounting mold is arranged in the center of an outer mold in a sleeving way; the bottom end of the inner mold extends out from the outer mold. Compared with the prior art, the special bearing press mounting equipment has the advantages that the bearing and the clutch driving disc to be processed can be continuously provided by ...

Output current sensing device and method used in primary side of flyback converter

The invention discloses an output current sensing device used in a primary side of a flyback converter. The converter comprises a primary side coil, a secondary side coil, and a power switch which is connected with the primary side coil and is used for controlling the switching of signals to generate an induction current on the secondary side coil. The invention is characterized in that the output current sensing device comprises a sampling and maintaining circuit, a detector, a buffer and a low pass filter, wherein the buffer is connected with the sampling and maintaining circuit and the detector, and generates a fourth signal according to a second signal and a third signal, the period and operating time of the fourth signal are same as those of the third signal, and the peak value is determined by the second signal; and the low pass filter is connected with the butter and filters the fourth signal to generate a sensing signal related to the output current of the flyback converter. The ...

Three-end type conversion circuit and relevant flyback type, voltage-boosting type and voltage-reducing type voltage stabilizers

The invention brings forward one of three-end type conversion circuits. The three-end type conversion circuit comprises a first voltage input end which is used for receiving first voltage; a second voltage input end which is used for receiving working voltage; a grounding end; a power switch which is coupled between the first voltage input end and the grounding end; a starting circuit which is used for generating a starting signal according to the first voltage; a clock pulse signal generator which is used for generating a clock pulse signal according to the working voltage; an error detector which is used for generating an error signal via comparison of the working voltage and reference voltage; and a control signal generator which is used for generating a control signal according to the error signal and the clock pulse signal so that switching operation of the power switch is controlled. The first voltage input end, the second voltage input end and the grounding end are the only three ...

Radiating structure for expanding laminated plate framework

The invention provides a radiating structure for expanding a laminated plate framework. In the radiating structure, a host plate and a first expanding plate are fixed by a fixing element arranged on aheat absorbing substrate so that a heating element arranged on the host plate or the first expanding plate can be directly adhered to a heat absorbing surface of the heat absorbing substrate to absorb the heat energy of the heating element and a radiating plate extended on the lateral side of the heat absorbing substrate radiates the heat energy absorbed by the heat absorbing substrate to effectively reduce the space occupied thereby, and the radiating structure can solve the problems that the prior radiating structure cannot be effectively applied in the heat energy dissipation of processingthe heating element between the host plate and the expanding plate in the expanding laminated plate framework because of large space occupied by the prior radiating structure and generates assembly tolerance ...

Pulse width modulation controller and method used for reducing output ripples

The invention relates to a pulse width modulation controller and a method which are used for reducing output ripples. The method comprises the following steps that: the current of a power switch of a switching type power source supply is detected, so that current sensing signals can be obtained; and the level of the current sensing signals is adjusted according to the switching frequency of the power switch, so that the work time of the power switch can be changed, and therefore, output ripples of the switching type power source supply which are caused by jiggering frequency can be decreased.

Device and method for controlling temperature gain

This invention discloses a device and method for controlling temperature gain; the device dynamically controls heaters installed around electronic components to heat by sensing temperature of work environment and generating a control signal and a PWM (Pulse Width Modulation) signal according to the temperature of the work environment, thus the stability of the electronic element can be improved when the temperature of the work environment is over-low.

Device and method for improving standby time efficiency of charger and ultra-low standby power charger

The invention provides a device for improving standby time efficiency of a charger, wherein, the charger contains two connection pins for connecting batteries, and a switching power switch for a voltage converter and a power controller. The device is characterized by comprising a power monitoring circuit and an optical coupler, wherein, the power monitoring circuit is connected with the two connection pins and generates a control signal according to the voltage and the current detected from the power monitoring circuit; and the optical coupler is connected with the power monitoring circuit for converting the control signal into an enabling signal and transmitting the enabling signal to the power controller so as to enable or switch off the power controller. The device and a method for improving the standby time efficiency of the charger, and the ultra-low standby power charger have the advantage of reducing power consumption during the standby period.

New -type waist function exercise rehabilitation equipment

The utility model discloses a new -type waist function exercise rehabilitation equipment, fxed support plate, overarm brace are installed to its frame, and the overarm brace includes two crossbeam square tube pipes, and fxed support plate installs the activity pivot, and it is upward distolateral that activity pivot upper end extends to fxed support plate, and the tip is distolateral under passing the clearance of two crossbeam square tubes pipes and extending to the overarm brace under the activity pivot, and the adjustable attenuator that is fixed in the overarm brace is installed to the tip under the activity pivot, install driving motor between fxed support plate and the overarm brace, driving motor's power output shaft installs a conical tooth wheel, and the 2nd conical tooth wheel is installed at activity pivot middle part, and the frame corresponds driving motor and installs motor push mechanism, the distolateral waist mounting of installing before the frame, the last distolateral ...

Head governor vessel massage device

The utility model provides a head governor vessel massage device, the utility model relates to a massage device though relate to the massage of head governor vessel for solving current head massage device, is mostly to massage a few acupuncture points on the human bodys on the governor vessel, can not realize that the head governor vessel follows the problem through massaging. A head governor vessel massage device which forms including elasticity hoop, massage shell, two massage heads, two medical magnetites, control module, battery, button, flat linear oscillator. The middle part of massage shell is equipped with logical groove, and the size in logical groove permits the elasticity hoop to peg graft at logical inslot, and massages the shell and can move on the elasticity hoop under the exogenic action. The bottom of massage shell is equipped with two massage heads, the inside of massage head studs with medical magnetite. The inside of massage shell is equipped with control module, battery ...

Portable head massage appearance

The utility model provides a portable head massage appearance, the utility model relates to a head massage appearance, for solving the bulky of current head massage appearance, weight is overweight, hand -carries inconveniently, wears the overhead uncomfortable problem of bringing out the neck illness even of sensation of making us for a long time more. The utility model discloses the top end of the hairpin body is equipped with three recess, and miniature lithium battery, flat linear oscillator, controller set up respectively from left to right in three recess, the button setting on the outer wall of the hairpin body, button and controller electric connection, miniature lithium battery and controller electric connection, the equipartition sets up seven spouts in the internal segmental arc of hairpin that controller and flat linear oscillator electric connection, the central angle of the hairpin body correspond, sets up a rubber convex body in every spout, is equipped with a magnetite in ...

System and method for monitoring program

The invention relates to a system for monitoring program, which comprises a two-dimensional orthogonal diagram and a marker, wherein the two-dimensional orthogonal diagram is provided with a first shaft which is related to the wafer measurement value of a wafer, and a second shaft which is related to the program total value of a set program, and the two-dimensional orthogonal diagram is provided with a sealing and annular control limit inside; and the marker displays the program total value and the wafer measurement value in the two-dimensional orthogonal diagram.

Radiating structure for expanding laminated plate framework

The invention provides a radiating structure for expanding a laminated plate framework. In the radiating structure, a host plate and a first expanding plate are fixed by a fixing element arranged on a heat absorbing substrate so that a heating element arranged on the host plate or the first expanding plate can be directly adhered to a heat absorbing surface of the heat absorbing substrate to absorb the heat energy of the heating element and a radiating plate extended on the lateral side of the heat absorbing substrate radiates the heat energy absorbed by the heat absorbing substrate to effectively reduce the space occupied thereby, and the radiating structure can solve the problems that the prior radiating structure cannot be effectively applied in the heat energy dissipation of processing the heating element between the host plate and the expanding plate in the expanding laminated plate framework because of large space occupied by the prior radiating structure and generates assembly tolerance ...

Soft body protection method and apparatus thereof

This invention discloses a kind of software protection method and apparatus. It stores a part of the software to a computer, another part of the software to a software protection apparatus. Both the computer and software protection apparatus store a login certificate. So when the software startup, it can make sure whether the software can start by authenticating the accordance of the two login certificates. When executing the software, it can issue a calling instruction that corresponding to the other part of software to the software protection apparatus, which calculates according to the calling instruction, and sends back the calculation result to computer. After the execution of software, the software protection apparatus can random check to ensure the cooperation between software protection apparatus and computer, so to increase the protection effect of software.

Power-factor correction circuit of power converter

The invention provides a power-factor correction circuit of a power converter. The power converter comprises a primary coil, a secondary coil, a sensing coil and a power switch. The power-factor correction circuit comprises a zero-current detection circuit, an error detection circuit, a slope signal generation circuit, a comparison circuit and a triggering circuit. The zero-current detection circuit is used for detecting sensing signals of the sensing coil so as to generate detection signals. According to reference signals, the error detection circuit generates error signals corresponding to output voltage signals or output current signals. The slope signal generation circuit is used for generating slope signals. The comparison circuit is used for comparing the slope signals and the error signals. According to the detection signals and the comparison signals, the triggering circuit generates controls signals to control the power switch and controls a slope signal generation circuit to adjust ...