Switch control apparatus

Mode of execution

The following, the shape of the embodiment of the invention.

(Aspect 1)

Figure 1 the invention is shown in section 1 the switch control device implementing shape of the wiring diagram, Figure 2 is shown in Figure 1 in the control device the switch of the control circuit to switch the movements of the component map. Figure 3 as shown in Figure 1 the switch in the control device the load state of the relative to the output of the control circuit to switch the movements of the component map.

As shown in Figure 1, the switch control device 2 has: the power supply is connected to an input 1 of the rectifying circuit extracts Internet 3 ; the rectification circuit 3 for filtering the output of the filtering capacitor 4 ; from the input side (5a) to the output side (5b) of the power, supply of the transformer 5 ; protection switch element 7 in order to prevent the switching element 7 of the control circuit 8 to the on/off control of oscillation (ringing) and for reduction of the buffer circuit 6 (snubber   circuit); the transformer 5 output of the 5b of the rectifying diode extracts Internet 9 ; the rectifier diode 9 to the output of the filter, with the output connected to the load 11 power supply filter capacitor 10 ; the load 11 the load state detection results to the control circuit 8 to the supply voltage terminal (the following, to VDD end) is subjected to feedback load state detection unit 12 ; and the control circuit 8 of the end is connected with GND and VDD of the capacitor 13. At start-up, from VIN end to the control circuit 8 of the end of the power supply VDD. A load state detection unit 12 of the output, also to the control circuit 8 of the end of the task of power supply VDD. Here, the power supply is connected to an input 1 set to AC power supply, the rectifying circuit is 3, but in the power supply 1 is set as the direct current power supply, does not need the rectifier circuit 3. Switch element 7 for the on/off control of the control circuit 8 has: the end is connected with VDD value of the triangular wave generating circuit 14 ; predetermined value according to the triangular wave generating circuit 14 and the output signal of the corresponding change of the upper limit value of the triangular wave and the triangular wave generating circuit 15 ; detecting flowing through the switch element 7 of the drain current of the current detection unit 16 ; by utilizing the changes in the output load state and the corresponding end of the voltage of the VDD, to adjust the drain current detecting unit 16 a detection reference level of the current detecting circuit 17 ; and triangular wave generating circuit according to the 15 the output signal of the (triangular wave) SAWTOOTH, to oscillation frequency, and according to the current detecting circuit 17 DCon the output signal, to turn on the duty ratio, in order to implement the switch element 7 on/off control of the on/off circuit 18.

Figure 2 (a) is shown in Figure 1 the switch control device for load state detection unit 12 is set to be the output of the load state if the output of the normal load state is a load state detection unit 12 to reduce the output of the (i.e., to the VDD power supply of lower end) of the, end of the with respect to the change of voltage VDD, a triangle wave generation circuit 15 SAWTOOTH the output signal, the overcurrent detection circuit 17 DCon the output signal, and the switching element 7 of the terminal voltage signal of GATE Vgate, Figure 2 (b) anti-shown in Figure 1 the switch control device for load state detection unit 12 is set to be the output of the load state if the output of the no-load or light-load state is a load state detection unit 12 with the output (i.e., to the VDD end of the supply power is increased and the rise in voltage VDD) of the, end of the with respect to the change of voltage VDD, a triangle wave generation circuit 15 SAWTOOTH the output signal, the overcurrent detection circuit 17 DCon the output signal, and the switch element 7 Vgate GATE end of the voltage signal. Figure 2 the MAXDC in that the switching element 7 of the maximum on-duty ratio.

In this case, the voltage VDD is reduced, the switch element 7 the oscillation frequency, but also the switch element 7 DCon the conduction duty ratio is increased, on the contrary, due to the rise in voltage VDD, the switch element 7 to reduce the frequency of oscillation of the, but also the switch element 7 DCon reduce the conduction duty ratio. Therefore, as shown in Figure 3, the change of state according to the output load, the switch element 7 and the frequency of oscillation of the corresponding changes in on duty ratio. Through this, the switch element 7 the frequency of oscillation of the dispersion, can reduce or alleviate the noise generated by the switch action.

Here, if it improves the load state detection unit 12 relative to the output load of the output of the the responsibility of the change of state, the change of the terminal voltage of the VDD relative to the output of the sensitivity of the change of state of the load, so can improve the switching element 7 and on the frequency of oscillation of the change of the duty ratio relative to the output of the sensitivity of the load state. On the other hand, if reducing load state detection unit 12 relative to the output load of the output of the the responsibility of the change of state, VDD end of the load relative to the output voltage change the sensitivity of the change of state is reduced, so also can reduce the switching element 7 and on the frequency of oscillation of the change of the duty ratio relative to the output of the sensitivity of the load state. Therefore, by adjusting the load state detection unit 12 relative to the output load of the output of the the responsibility of the change of state, to the reducing or alleviating the switch element 7 due to the noise generated by the switching action of the optimization.

Furthermore, if the switch element 7 and the control circuit 8 is formed into a component of the semiconductor device, can be attempted to realize the switching control device miniaturization and high reliability. This kind of situation in the latter of the whole implementation can also be said that in is the same.

(Aspect 2)

Figure 4 is the switch control device, is that the Figure of this invention said section 2 aspect 1 of the present invention as shown in section 1 implementation of the switch control device for load state detection unit 12, the same effect as obtained, a detailed description therefore is omitted.

A load state detection unit 12 has: an output voltage detecting circuit 19 ; photo-coupler 20 ; transformer 5 the auxiliary winding 5c; the auxiliary winding and 5c is connected with the rectifying diode 21 and filter capacitor 22. By using an output voltage detection circuit 19 VOUT detection output voltage, the voltage of the desired the above situation, with the photo-coupler (photocoupler) 20 from the filtering capacitor 22 to the control circuit 8 of the end of the power supply VDD, VDD voltage rise. On the contrary, the desired voltage of the following situation, voltage drop VDD end. Through such, can realize the invention section 1 implementation the action of the switch control device.

(Aspect 3)

Figure 5 is map action of said section of the invention 3 the implementation of the switch control device, Figure 6 is shown in Figure 5 in the switch control device for the load state relative to the output of the control circuit of the switch element. The control circuit 8 has the light load detection circuit 23, the light-load detecting circuit 23 and is connected with VDD, when the no-load or light load, interruption or stop using the on/off circuit 18 of the switching element 7 the on/off control, in addition, with this invention the section 1 control device for the implementation of the switch of the same shape, therefore, the following only by the load detection circuit 23 of the effect produced.

If the reflected output voltage VDD to the load state of the internal the specified voltage or more, the light carries the examination circuit 23 detects the output load is the no-load state or the light load state, the use of on/off circuit 18 of the switching element 7 on/off control of the interruption or stop.

Through such, can reduce the power consumption of the no-load or light load.

Here, by making the light load detection circuit 23 with the inside of the hysteresis characteristic of the specified voltage, thereby stably control the switching element on/off control of the interruption or stop.

(Aspect 4)

Figure 7 is the switch control device, is to make the Figure of said section of the present invention 4 aspect 5 of the present invention shown in the section 3 the implementation of the switch control device of the drain current detection unit 16 through the switch element 7 to measure the break-over voltage, because the same effect obtained, therefore description is omitted.

(Aspect 5)

Figure 8 is map action of said section of the present invention 5 the switch control device implementing shape, Figure 9 that Figure 8 of the switch control device for use in a switching element control circuit. In the switch control device, to the control circuit 8 except setting VDD end, in addition to load state detection unit 12 of the output of the FB end of the input. Here, Figure 5 of the present invention shown in section 3 form the implementation of the switch of the control circuit in the control device 8 is connected with VDD of the circuit of the, in fig. 8 section of the present invention 5 switch control device for implementation in the end is connected with the FB. VIN end of the power supply, VDD end as a control circuit 8 to the supply voltage terminal, is always controlled to a certain. Therefore, with respect to the load state detection unit 12 of the output signal of the switch control, and the effect (noise reducing or alleviating effect, and no-load and light load, the power consumption reducing effect) with the map 5 shown in section of the present invention 3 implementation is the same as the switch control device.

In this case, due to the drop of the terminal voltage FB, and the switch element 7 the oscillation frequency, but also the switch element 7 DCon the conduction duty ratio is increased. On the contrary, due to the rise of the voltage FB end, the switch element 7 to reduce the frequency of oscillation of the, but also the switch element 7 DCon reduce the conduction duty ratio. Therefore, as shown in Figure 3, the change of state according to the output load, the switch element 7 and the frequency of oscillation of the corresponding changes in on duty ratio. Through this, the switch element 7 the frequency of oscillation of the dispersion, can reduce or alleviate the noise generated by the switch action.

(Aspect 6)

Figure 10 is section of the invention shown in 6 the form of implementation of the switch control device, Figure 11 is shown in Figure 10 in the switch control device using control circuit to switch the movements of the component map.

As shown in Figure 10, the switch control device 2 has: the power supply is connected to an input 1 of the rectifying circuit extracts Internet 3 ; the rectification circuit 3 for filtering the output of the filtering capacitor 4 ; from the input side (5a) to the output side (5b) of the power, supply of the transformer 5 ; protection switch element 7 in order to prevent the switching element 7 of the control circuit 8 to the on/off control of the extent of reduction in generated by the oscillation of the buffer circuit 6 ; the transformer 5 output of the 5b of the rectifying diode extracts Internet 9 ; the rectifier diode 9 to the output of the filter, with the output connected to the load 11 power supply filter capacitor 10 ; as the load state detection unit 12 detects the load state on the basis of the output of the filtering capacitor to corresponding changes in the 4 the voltage waveform (with reference to Figure 11 (a)), and to the control circuit 8 of the transmission of signal VJ end of the input voltage detection circuit 12 ; detecting load 11 of the output voltage, and to the control circuit 8 to the supply voltage terminal (the following, the end of the VDD) for the feedback of the output voltage detection unit 25 ; and the control circuit 8 of the end is connected with GND and VDD of the capacitor 13. At start-up, from VIN end to the control circuit 8 of the end of the power supply VDD. The output voltage detection unit 25 assume also the output to the control circuit 8 of the end of the task of power supply VDD. Here, the power supply is connected to an input 1 set to AC power supply, the rectifying circuit is 3, but in the power supply 1 is set as the direct current power supply, does not need the rectifier circuit 3. Switch element 7 for the on/off control of the control circuit 8 has: VJ end is connected with the predetermined value of the triangular wave generating circuit 14 ; predetermined value according to the triangular wave generating circuit 14 and the output signal of the corresponding change of the upper limit value of the triangular wave and the triangular wave generating circuit 15 ; in accordance with the load state of the corresponding changes in the voltage of the VDD output end of the switch element 7 DCon the conduction duty cycle adjustment signal the conduction duty ratio decision circuit 24 ; and triangular wave generating circuit according to the 15 SAWTOOTH to provide the output signal of the oscillation frequency, and the on-duty ratio decision circuit 24 DCon to provide the output signal of the duty ratio in order to be implemented on the switch element 7 on/off control of the on/off circuit 18.

Figure 11 (a) the output shown in the load state from the no-load to the heavy load at the time of the change is proportional to the input voltage VIN VJ end of the voltage waveform. Figure 11 (b) will be shown with the output load of VJ to corresponding changes in the change of state of the specified value by utilizing the end voltage of the triangular wave generating circuit 14 is set to the upper limit value of the triangular wave, thus in the on-duty ratio decision circuit 24 output signal DCon as shown in Figure 11 (b) at the time of the change indicated by the triangular wave generating circuit 15 is the output signal of the load relative to the output SAWTOOTH the change of the change of state. Figure 11 (c) is shown according to fig. 11 (b) and shown in signal SAWTOOTH DCon signal generated, the switch element 7 of the maximum conduction duty ratio signal MAXDC, and switching element 7 Vgate GATE end of the voltage signal.

In this case, due to the drop of the terminal voltage VJ, and the switch element 7 the oscillation frequency, but also the switch element 7 DCon the conduction duty ratio is increased. On the contrary, due to the rise of the voltage VJ end, the switch element 7 to reduce the frequency of oscillation of the, but also the switch element 7 DCon reduce the conduction duty ratio. Therefore, and Figure 3 the invention bamboo bed mat 1 implementation the action of the switch control device for the same, the change of state according to the output load, the switch element 7 and the frequency of oscillation of the corresponding changes in on duty ratio. Through such, or can be reduced to reduce the switching element 7 of the noise generated by the switch action.

(Aspect 7)

Figure 12 is the switch control device, is that the Figure of this invention said section 7 implementation 10 of the present invention shown in section 6 implementation of the switch control device of the output voltage detection unit 25, to obtain the same effect as a result, a detailed description therefore is omitted.

The output voltage detection unit 25 has: an output voltage detecting circuit 19 ; photo-coupler 20 ; transformer 5 the auxiliary winding 5c; the auxiliary winding and 5c is connected with the rectifying diode 21 and filter capacitor 22. By using an output voltage detection circuit 19 VOUT detection output voltage, the voltage of the desired the above situation, with the photo-coupler 20 from the filtering capacitor 22 to the control circuit 8 of the end of the power supply VDD, VDD voltage rise. On the contrary, the desired voltage of the following situation, voltage drop VDD end. Through such, can realize the invention section 6 implementation of the switch control device.

(Aspect 8)

Figure 13 is the switch control device, is that the Figure of this invention said section 8 implementation 10 of the present invention shown in section 6 implementation of the switch control device for load state detection unit 12 that is, the input voltage detection circuit, to obtain the same effect as a result, a detailed description therefore is omitted.

A load state detection unit 12 is the input voltage detection circuit 2 VIN resistance by dividing the input voltage, so that the partial pressure of a voltage to the control circuit 8 VJ end of the output. Through such, can realize the invention section 6 implementation of the switch control device.

(Aspect 9)

Fig. 14 is section of this invention 9 switch control device for implementation. The control circuit 8 has the light load detection circuit 23, the light-load detecting circuit 23 and is connected with VDD, when the no-load or light load, interruption or stop using the on/off circuit 18 of the switching element 7 the on/off control, in addition, because the section of this invention 6 implementation is the same as the switch control device, therefore, the following only by the load detection circuit 23 of the effect produced.

If the reflected output voltage VDD to the load state of the internal the specified voltage or more, the light carries the examination circuit 23 detects the output load is the no-load state or the light load state, the use of on/off circuit 18 of the switching element 7 on/off control of the interruption or stop.

Through such, can reduce the power consumption of the no-load or light load.

Here, by making the light load detection circuit 23 with the inside of the hysteresis characteristic of the specified voltage, thereby stably control the switching element on/off control of the interruption or stop.

(Aspect 10)

Figure 15 is section of the invention 10 the implementation of the switch control device, to the control circuit 8 is provided in addition to the end of the VDD, the output of the voltage detection circuit 19 of the output of the FB end of the input. Here, Figure 14 shown in section of the present invention 9 implementation in the switch of the control circuit of the control device 8 is connected with VDD end of the circuit, in the Figure 15 section of the present invention 10 switch control device for implementation with FB end is connected, power is supplied from the VIN, VDD end as a control circuit 8 to the supply voltage terminal, is always controlled to a certain. Therefore, because the relative to the output voltage detection circuit 19 of the output signal of the switching element 7 of the switch control and conduction duty ratio control, and that the effect, and Figure 14 shown in section of the present invention 9 the switch control device implementing shape is the same, so description is omitted.

(Aspect 11)

Fig. 16 is section of the present invention 11 switch control device for implementation. Figure 16 the switch control device shown in 2 the polarity of the output is the voltage of the (+) a step-down chopper, with: the power supply is connected to an input 1 of the rectifying circuit extracts Internet 3 ; the rectification circuit 3 for filtering the output of the filtering capacitor 4 ; the switch element 7 ; for the switch element 7 of the on/off control of the control circuit 8 ; the regeneration diode 26 ; coil 27 ; filter capacitor 10 ; in order to connect the load 11 for controlling an output voltage of a desired voltage and detecting an output voltage, and outputs the detection results to the control circuit 8 of the feedback FB end of a load state detection unit 12 ; and the control circuit 8 of the end is connected with GND and VDD of the capacitor 13. At start-up, from VIN end, and movement to the control circuit 8 of the end of the power supply VDD, VDD end as a control circuit 8 to the supply voltage terminal, is always controlled to a certain. Here, the power supply is connected to an input 1 set to AC power supply, the rectifying circuit is 3, but in the power supply 1 is set as the direct current power supply, does not need the rectifier circuit 3. Due to the switch element 7 for the on/off control of the control circuit 8 and Figure 8 section of the present invention 5 the switch of the implementation of the control device in the control circuit 8 a is the same, using the inputted signal FB end of the switch element 7 the on/off control of the same action, the effect of the description is therefore omitted, as shown below for only the action of the control device by the switch.

In Figure 16 the switch control device 2 is connected with the output of the load 11 of the power supply, the switching element 7 is turned on, is the switch element 7 through the coil 27 to the filter capacitor 10 to realize the power supply, and at the time of disconnection of the switching element, is through the coil 27 of the back EMF in the regenerative diode 26 and a coil 27 and filter capacitor 10 to the filtering capacitor in the loop 10 to realize the power supply. If the filter capacitor 10 to the two ends of the the voltage of the desired voltage, the load state detection unit 12 to the control circuit output signal of 8 transfer the FB, adjustment to the output supply of the power, so that the output voltage reaches a desired voltage.

(Implementation 12)

Figure 17 shows the invention section 12 of the switch control device implementing shape. Figure 16 section of the present invention 11 implementation of the switch control device in the form of the filtering capacitor 4 negative (-) end of the filter capacitor 10 of the end is connected with the negative (-), and this different is, the section 12 of the filtering capacitor implementation 4 negative (-) end of the filter capacitor 10 is connected with the positive (+) end, so as to be able to make the output voltage of the negative polarity (-) of the step-down chopper. As the movements and the switch control device of the present invention to obtain the effect of section 11 implementing shape is the same as the switch control device, therefore, omitted.