CN102904431B - A kind of Switching Power Supply and constant voltage output controller thereof - Google Patents
A kind of Switching Power Supply and constant voltage output controller thereof Download PDFInfo
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Abstract
The present invention is applicable to field of switch power, provides a kind of Switching Power Supply and constant voltage output controller thereof.The present invention by adopting the constant voltage output controller comprising and start module, voltage comparison module, reference voltage generation module, power switch, voltage sample amplification module and pulse width modulation module in Switching Power Supply, simplify the circuit structure of Switching Power Supply, reduce cost, reliablely and stablely can export to realize constant voltage to load the output voltage property performance period modulation of output stage load driving circuits simultaneously, solve the complicated and problem that cost is high of the stability of a system that prior art exists and poor reliability, circuit structure.
Description
Technical field
The invention belongs to field of switch power, particularly relate to a kind of Switching Power Supply and constant voltage output controller thereof.
Background technology
At present, along with development and the renewal of switch power technology, Switching Power Supply has possessed the advantage that efficiency is high, volume is little and cost is low, so it has been widely used in various electronic equipment.Particularly in small household appliance (as electric cooker, soy bean milk making machine and electromagnetic oven), Switching Power Supply generally only needs to possess constant voltage output function.
Export to realize constant voltage in small household appliance, prior art provides a kind of BUCK-BOOST(Buck-Boost) switch power supply system, the controller of its inside is by detecting the feedback voltage of output stage, adjust inner switching frequency according to the change of feedback voltage in good time, and then realize constant voltage output.Aforesaid prior art exports although can realize constant voltage, but detect because it needs to increase the voltage of partial circuit to output stage, cause its circuit structure relative complex, and controller connecting pin position is many, packaging cost is high, cause controller cost to increase, reduce the antijamming capability of whole switch power supply system simultaneously, have impact on the stability of a system and poor reliability.
Summary of the invention
The object of the present invention is to provide a kind of constant voltage output controller of Switching Power Supply, be intended to solve the complicated and problem that cost is high of the stability of a system that prior art exists and poor reliability, circuit structure.
The present invention realizes like this, a kind of constant voltage output controller of Switching Power Supply, be connected with the input stage current rectifying and wave filtering circuit of Switching Power Supply and output stage load driving circuits, the input incoming transport civil power of described input stage current rectifying and wave filtering circuit, the output of described output stage load driving circuits is connected with load, and described constant voltage output controller comprises:
Input is connected with the output of described input stage current rectifying and wave filtering circuit, introduces direct current to start the startup module of described constant voltage output controller work when Switching Power Supply powers on from the output of described input stage current rectifying and wave filtering circuit;
Input is connected with the output of described startup module and the pressure feedback port of described output stage load driving circuits simultaneously, and the direct current power source voltage described startup module produced and reference voltage carry out exporting after voltage compare the voltage comparison module of corresponding comparative voltage;
The output of module is started described in input termination, first output and the second output are connected the reference voltage terminal of described startup module and the reference voltage terminal of described voltage comparison module respectively, for described startup module and described voltage comparison module provide the reference voltage generation module of reference voltage;
Input is connected with the output of described input stage current rectifying and wave filtering circuit, with specific switching frequency, the direct current that described input stage current rectifying and wave filtering circuit exports is carried out to the power switch of voltage modulated;
Input is connected with the output of described power switch, the input of output stage load driving circuits described in first output termination, voltage sample is carried out to the On current exported during described power switch conducting, and carried out by the voltage sampled amplifying the corresponding amplifier voltage of rear output, and described On current is exported to the voltage sample amplification module of described output stage load driving circuits simultaneously;
First input end and the second input are connected the output of described voltage comparison module and the second output of described voltage sample amplification module respectively, output connects the control end of described power switch, exports according to the clock signal of described comparative voltage, described amplifier voltage and inside the pulse width modulation module that the pulse signal with corresponding duty cycle of switching controls the switching frequency of described power switch.
Another object of the present invention is also to provide a kind of Switching Power Supply, and described Switching Power Supply comprises input stage current rectifying and wave filtering circuit, output stage load driving circuits and described constant voltage output controller;
The present invention by adopting the constant voltage output controller comprising described startup module, described voltage comparison module, described reference voltage generation module, described power switch, described voltage sample amplification module and described pulse width modulation module in Switching Power Supply, simplify the circuit structure of Switching Power Supply, reduce cost, reliablely and stablely can export to realize constant voltage to load the output voltage property performance period modulation of output stage load driving circuits simultaneously, solve the complicated and problem that cost is high of the stability of a system that prior art exists and poor reliability, circuit structure.
Accompanying drawing explanation
Fig. 1 is the function structure chart of the constant voltage output controller of the Switching Power Supply that the embodiment of the present invention provides;
Fig. 2 is the exemplary circuit structure chart of the constant voltage output controller of the Switching Power Supply that the embodiment of the present invention provides;
Fig. 3 is the exemplary circuit structure chart of the Switching Power Supply that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention by adopting the constant voltage output controller comprising and start module, voltage comparison module, reference voltage generation module, power switch, voltage sample amplification module and pulse width modulation module in Switching Power Supply, simplify the circuit structure of Switching Power Supply, reduce cost, can reliablely and stablely export to realize constant voltage to load the output voltage property performance period modulation of output stage load driving circuits simultaneously.
Fig. 1 shows the modular structure of the constant voltage output controller of the Switching Power Supply that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
Input stage current rectifying and wave filtering circuit 200 and the output stage load driving circuits 300 of constant voltage output controller 100 and Switching Power Supply are connected, the input incoming transport civil power of input stage current rectifying and wave filtering circuit 200, the output of output stage load driving circuits 300 is connected with load 400, and constant voltage output controller 100 comprises:
Input is connected with the output of input stage current rectifying and wave filtering circuit 200, introduces direct current to start the startup module 101 of constant voltage output controller 100 work when Switching Power Supply powers on from the output of input stage current rectifying and wave filtering circuit 200;
Input is connected with the startup output of module 101 and the pressure feedback port of output stage load driving circuits 300 simultaneously, and direct current power source voltage startup module 101 produced and reference voltage carry out exporting after voltage compare the voltage comparison module 102 of corresponding comparative voltage;
Input termination starts the output of module 101, first output and the second output are connected the startup reference voltage terminal of module 101 and the reference voltage terminal of voltage comparison module 102 respectively, for startup module 101 and voltage comparison module 102 provide the reference voltage generation module 103 of reference voltage;
Input is connected with the output of input stage current rectifying and wave filtering circuit 200, with specific switching frequency, the direct current that input stage current rectifying and wave filtering circuit 200 exports is carried out to the power switch 104 of voltage modulated;
Input is connected with the output of power switch 104, the input of the first output termination output stage load driving circuits 300, voltage sample is carried out to the On current exported during power switch 104 conducting, and carried out by the voltage sampled amplifying the corresponding amplifier voltage of rear output, and described On current is exported to the voltage sample amplification module 105 of output stage load driving circuits 300 simultaneously;
First input end and the second input are connected the output of voltage comparison module 102 and the second output of voltage sample amplification module 105 respectively, output connects the control end of power switch 104, exports according to comparative voltage, the amplifier voltage of voltage sample amplification module 105 output and the clock signal of inside that voltage comparison module 102 exports the pulse width modulation module 106 that the pulse signal with corresponding duty cycle of switching controls the switching frequency of power switch 104.
Fig. 2 shows the exemplary circuit structure of the constant voltage output controller of the Switching Power Supply that the embodiment of the present invention provides, and for convenience of explanation, illustrate only part related to the present invention, details are as follows:
As one embodiment of the present invention, start module 101 and comprise:
First error amplifier EA1, N channel junction field-effect pipe J1, resistance R1 and resistance R2;
The in-phase input end of the first error amplifier EA1 is the reference voltage terminal starting module 101, the grid of the output termination N channel junction field-effect pipe J1 of the first error amplifier EA1, the drain electrode of N channel junction field-effect pipe J1 and source electrode are respectively the input and output that start module 101, the source electrode of the first termination N channel junction field-effect pipe J1 of resistance R1, second end of resistance R1 and the first end of resistance R2 are connected to the inverting input of the first error amplifier EA1 altogether, the second termination virtual signal ground of resistance R2.Wherein, the threshold voltage of N channel junction field-effect pipe J1 is-9V, and its source electrode provides power supply for the internal circuit of whole constant voltage output controller 100.
As one embodiment of the present invention, voltage comparison module 102 comprises:
Resistance R3, resistance R4, the second error amplifier EA2 and electric capacity C2;
The first end of resistance R3 is the input of voltage comparison module 102, second end of resistance R3 and the first end of resistance R4 are connected to the inverting input of the second error amplifier EA2 altogether, the second termination virtual signal ground of resistance R4, the in-phase input end of the second error amplifier EA2 and output are respectively reference voltage terminal and the output of voltage comparison module 102, between the output that electric capacity C2 is connected to the second error amplifier EA2 and virtual signal ground.
As one embodiment of the present invention, reference voltage generation module 103 is conventional band-gap reference circuit.
As one embodiment of the present invention, power switch 104 is high pressure NMOS field effect transistor M1, and the grid of high pressure NMOS field effect transistor M1, drain electrode and source electrode are respectively the control end of power switch 104, input and output.Power switch 104 can also be that other possess the semiconductor device of switching characteristic in other embodiments of the present invention, as insulated gate bipolar transistor (IGBT, and technotron (JFET, JunctionFieldEffectTransistor) InsulatedGateBipolarTransistor).
As one embodiment of the present invention, voltage sample amplification module 105 comprises resistance R5 and amplifier OPA1, the first end of resistance R5 and the second end are respectively input and first output of voltage sample amplification module 105, the first end of the in-phase input end connecting resistance R5 of amplifier OPA1, the inverting input of amplifier OPA1 and second end of resistance R5 are connected to virtual signal ground altogether, and the output of amplifier OPA1 is the second output of voltage sample amplification module 105.
As one embodiment of the present invention, pulse width modulation module 106 comprises:
Comparator COMP1, d type flip flop TRG1, clock generation circuit 1061, first inverter INV1, the second inverter INV2 and the 3rd inverter INV3;
The in-phase input end of comparator COMP1 and inverting input are respectively first input end and second input of pulse width modulation module 106, the reseting controling end RB of the output termination d type flip flop TRG1 of comparator COMP1, the input D of d type flip flop TRG1 connects the output of the 3rd inverter INV3, the input termination virtual signal ground of the 3rd inverter INV3, the clock end FOSC of d type flip flop TRG1 connects the output of clock generation circuit 1061, the input of the first inverter INV1 is connected with the input of the second inverter INV2 with the output Q of d type flip flop TRG1 respectively with output, the output of the second inverter INV2 is the output of pulse width modulation module 106.Wherein, clock generation circuit 1061 can be ring oscillator or relaxation oscillator.
In actual applications, constant voltage output controller 100 can be integrated in a chip according to said structure and annexation, and the first output of the input of start-up circuit 101 and output and voltage sample amplification module 105 is respectively as three pins of constant-voltage controller, chip pin can be reduced like this, improve integrated level, three pin packaging structures of TO92 or SOT89-3 can be adopted, thus effectively reduce packaging cost.
The embodiment of the present invention additionally provides a kind of Switching Power Supply, and this Switching Power Supply comprises constant voltage output controller 100, input stage current rectifying and wave filtering circuit 200 and output stage load driving circuits 300.
Fig. 3 shows the exemplary circuit structure of the Switching Power Supply that the embodiment of the present invention provides, the wherein circuit structure of constant voltage output controller 100 and consistent shown in Fig. 2, do not repeat them here, for the circuit structure of input stage current rectifying and wave filtering circuit 200 and output stage load driving circuits 300, then details are as follows:
As one embodiment of the present invention, input stage current rectifying and wave filtering circuit 200 comprises rectifier diode D1 and filter capacitor C1, the anode of rectifier diode D1 and negative electrode are respectively input and the output of input stage current rectifying and wave filtering circuit 200, between the negative electrode that filter capacitor C1 is connected to rectifier diode D1 and ground.
As one embodiment of the present invention, output stage load driving circuits 300 comprises:
Electric capacity of voltage regulation C3, sustained diode 2, energy storage inductor L1, sustained diode 3 and electric capacity of voltage regulation C4;
The first end of electric capacity of voltage regulation C3 and the first end of energy storage inductor L1 are respectively pressure feedback port and the input of output stage load driving circuits 300, the negative electrode of sustained diode 2 connects the first end of electric capacity of voltage regulation C3, second end of electric capacity of voltage regulation C3 and the negative electrode of sustained diode 3 are connected to the first end of energy storage inductor L1 altogether, the anode of sustained diode 3 connects the first end of electric capacity of voltage regulation C4, and the first end of electric capacity of voltage regulation C4 is the output of output stage load driving circuits 300, second end of second end of electric capacity of voltage regulation C4 and the anode of sustained diode 2 and energy storage inductor L1 is connected to ground altogether.
In embodiments of the present invention, the output of load 400 is connected with second end of electric capacity of voltage regulation C4, and the difference of the input terminal voltage Von of load 400 and its output end voltage Vop is the required output voltage Vout realized of Switching Power Supply.
Below in conjunction with operation principle, the above-mentioned Switching Power Supply with constant voltage output controller 100 is described further:
When high pressure NMOS field effect transistor M1 conducting, charging energy-storing is carried out by high pressure NMOS field effect transistor M1 and resistance R5 to energy storage inductor L1 by the direct current exported after rectifier diode D1 and the process of filter capacitor C1 rectifying and wave-filtering, the now voltage VA of the first end of energy storage inductor L1 equal with the cathode voltage VDC of rectifier diode D1 (ignoring the conduction voltage drop of high pressure NMOS field effect transistor M1 herein), and sustained diode 2 and sustained diode 3 are all oppositely ended, electric capacity of voltage regulation C2 and electric capacity of voltage regulation C3 discharges electric energy respectively to the first end of resistance R3 and load 400; When high pressure NMOS field effect transistor M1 ends, it is that electric capacity of voltage regulation C4 and electric capacity of voltage regulation C3 charge that energy storage inductor L1 discharges electric energy, and sustained diode 2 and sustained diode 3 all conductings, now, the relational expression of the voltage VA of the first end of energy storage inductor L1 and the input terminal voltage Von of load 400 is as follows:
VA=＝Von-Vdf1（1）
Wherein, Vdf1 is the conduction voltage drop of sustained diode 3.
The relational expression of the voltage VB of the first end of electric capacity of voltage regulation C3 and the output end voltage Vop of load 400 is as follows:
VB=Vop-Vdf2（2）
Wherein, Vdf2 is the conduction voltage drop of sustained diode 2, and in embodiments of the present invention, the conduction voltage drop of sustained diode 2 and sustained diode 3 is identical, i.e. Vdf1=Vdf2.
Relational expression (1) and relational expression (2) are carried out subtracting each other and can be obtained following formula:
VB-VA=Vop-Von（3）
Wherein, VB-VA is exactly the voltage difference VDD between the first end of resistance R3 and second end (being namely virtual signal ground) of resistance R5, Vop-Von is exactly the required output voltage Vout realized of Switching Power Supply, therefore, the relation between output voltage Vout and VDD as shown in the formula:
VDD=Vout（4）
Then only need by constant voltage output controller 100 control voltage difference VDD constant, constant control can be realized to output stage voltage difference Vout, thus reach the object realizing constant voltage output to load 400.
At the beginning of Switching Power Supply powers on, the voltage of the source electrode of N channel junction field-effect pipe J1 is approximately zero, the output output low level of the first error amplifier EA1 is to the grid of N channel junction field-effect pipe J1, then N channel junction field-effect pipe J1 conducting, it (is in fact exactly improve voltage difference VDD that the drain electrode of N channel junction field-effect pipe J1 makes the voltage of its source electrode raise from the negative electrode introducing direct current of rectifier diode D1, this end is also internal electrical source and the feedback end of constant-voltage controller 100), now constant voltage output controller 100 starts to start work, as the reference voltage VJ that the voltage obtained after the voltage of the source electrode of N channel junction field-effect pipe J1 is by resistance R1 and resistance R2 dividing potential drop accesses higher than the in-phase input end of the first error amplifier EA1, first error amplifier EA1 exports the grid of zero level (be namely zero level relative to virtual signal) to N channel junction field-effect pipe J1, namely the source voltage of N channel junction field-effect pipe J1 equals voltage difference VDD(is VDD relative to virtual signal), then N channel junction field-effect pipe J1 is less than the absolute value of the threshold voltage of technotron J1 and ends because of the absolute value of its grid-source voltage difference, now constant voltage output controller 100 completes electrifying startup.
Constant voltage output controller 100 is after electrifying startup, the source voltage (i.e. VDD) of N channel junction field-effect pipe J1 inputs to the inverting input of the second error amplifier EA2 by the voltage VI obtained after resistance R3 and resistance R4 dividing potential drop, then the relational expression of VI and VDD is as follows:
Meanwhile, the in-phase input end of reference voltage generation module 103 output reference voltage VR to the second error amplifier EA2.When VI is greater than VR, the output voltage VF of the second error amplifier EA2 is low level, and along with the reduction of VI, VF can increase gradually, when the output voltage of Switching Power Supply tends towards stability, then VI=VR, the relation that can be obtained output voltage Vout and VR by relational expression (4) and relational expression (5) is as follows:
From relational expression (6), when Switching Power Supply realizes constant voltage output, output voltage Vout is shown below:
As can be seen from relational expression (7), output voltage Vout is constant.
Simultaneously, the two ends of resistance R5 can form sampled voltage when high pressure NMOS field effect transistor M1 conducting, the sampled voltage at resistance R5 two ends amplifies the rear inverting input exporting comparative voltage VS to comparator COMP1 by amplifier OPA1, then comparator COMP1 controls the operating state of d type flip flop TRG1 by comparing the corresponding level signal of rear output to the input voltage VF of its in-phase input end and the input voltage VS of inverting input, when VS is greater than VF, comparator COMP1 output low level is to the reseting controling end RB of d type flip flop TRG1, when VS is less than VF, comparator COMP1 exports the reseting controling end RB of high level to d type flip flop TRG1, therefore, the pulse signal ON making comparator COMP1 output one have low and high level change that varies in size of both VS and VF, when the trailing edge of the clock signal that the clock end FOSC of d type flip flop TRG1 inputs arrives and pulse signal ON is high level, the output Q of d type flip flop TRG1 exports high level and carries out dual anti-phase rear drive high pressure NMOS field effect transistor M1 conducting through the first inverter INV1 and the second inverter INV2, after NMOS field effect transistor M1 conducting, the electric current flowing through resistance R5 increases gradually, therefore the VS voltage that voltage sample amplification module 105 produces also increases gradually, when VS is greater than VF, comparator COMP1 output low level is to the reseting controling end RB of d type flip flop TRG1, then d type flip flop TRG1 directly from its output Q output low level through the first inverter INV1 and the second inverter INV2 carry out dual anti-phase after high pressure NMOS field effect transistor M1 is closed, therefore, by pulse signal ON with by d type flip flop TRG1, the duty cycle of switching of the logic drive circuit multicycle ground repetitive control high pressure NMOS field effect transistor M1 that the first inverter INV1 and the second inverter INV2 is formed, realize modulating again and again the output voltage of whole Switching Power Supply is tended towards stability, final realization exports the constant voltage of load.
The embodiment of the present invention by adopting the constant voltage output controller comprising and start module, voltage comparison module, reference voltage generation module, power switch, voltage sample amplification module and pulse width modulation module in Switching Power Supply, simplify the circuit structure of Switching Power Supply, reduce cost, reliablely and stablely can export to realize constant voltage to load the output voltage property performance period modulation of output stage load driving circuits simultaneously, solve the complicated and problem that cost is high of the stability of a system that prior art exists and poor reliability, circuit structure.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a Switching Power Supply, it comprises input stage current rectifying and wave filtering circuit, output stage load driving circuits and constant voltage output controller, input stage current rectifying and wave filtering circuit and the output stage load driving circuits of described constant voltage output controller and Switching Power Supply are connected, the input incoming transport civil power of described input stage current rectifying and wave filtering circuit, the output of described output stage load driving circuits is connected with load, it is characterized in that, described constant voltage output controller comprises:
Input is connected with the output of described input stage current rectifying and wave filtering circuit, introduces direct current to start the startup module of described constant voltage output controller work when Switching Power Supply powers on from the output of described input stage current rectifying and wave filtering circuit;
Input is connected with the output of described startup module and the pressure feedback port of described output stage load driving circuits simultaneously, and the direct current power source voltage described startup module produced and reference voltage carry out exporting after voltage compare the voltage comparison module of corresponding comparative voltage;
The output of module is started described in input termination, first output and the second output are connected the reference voltage terminal of described startup module and the reference voltage terminal of described voltage comparison module respectively, for described startup module and described voltage comparison module provide the reference voltage generation module of reference voltage;
Input is connected with the output of described input stage current rectifying and wave filtering circuit, with specific switching frequency, the direct current that described input stage current rectifying and wave filtering circuit exports is carried out to the power switch of voltage modulated;
Input is connected with the output of described power switch, the input of output stage load driving circuits described in first output termination, voltage sample is carried out to the On current exported during described power switch conducting, and carried out by the voltage sampled amplifying the corresponding amplifier voltage of rear output, and described On current is exported to the voltage sample amplification module of described output stage load driving circuits simultaneously;
First input end and the second input are connected the output of described voltage comparison module and the second output of described voltage sample amplification module respectively, output connects the control end of described power switch, exports according to the clock signal of described comparative voltage, described amplifier voltage and inside the pulse width modulation module that the pulse signal with corresponding duty cycle of switching controls the switching frequency of described power switch;
Described output stage load driving circuits comprises:
Electric capacity of voltage regulation C3, sustained diode 2, energy storage inductor L1, sustained diode 3 and electric capacity of voltage regulation C4;
The first end of described electric capacity of voltage regulation C3 and the first end of described energy storage inductor L1 are respectively pressure feedback port and the input of described output stage load driving circuits, the negative electrode of described sustained diode 2 connects the first end of described electric capacity of voltage regulation C3, second end of described electric capacity of voltage regulation C3 and the negative electrode of described sustained diode 3 are connected to the first end of described energy storage inductor L1 altogether, the anode of described sustained diode 3 connects the first end of described electric capacity of voltage regulation C4, and the first end of described electric capacity of voltage regulation C4 is the output of described output stage load driving circuits, second end of second end of described electric capacity of voltage regulation C4 and the anode of described sustained diode 2 and described energy storage inductor L1 is connected to ground altogether.
2. Switching Power Supply as claimed in claim 1, it is characterized in that, described startup module comprises:
First error amplifier, N channel junction field-effect pipe J1, resistance R1 and resistance R2;
The in-phase input end of the first error amplifier is the reference voltage terminal of described startup module, the grid of N channel junction field-effect pipe J1 described in the output termination of described first error amplifier, the drain electrode of described N channel junction field-effect pipe J1 and source electrode are respectively input and the output of described startup module, the source electrode of N channel junction field-effect pipe J1 described in first termination of described resistance R1, second end of described resistance R1 and the first end of described resistance R2 are connected to the inverting input of described first error amplifier altogether, the second termination virtual signal ground of described resistance R2.
3. Switching Power Supply as claimed in claim 1, it is characterized in that, described voltage comparison module comprises:
Resistance R3, resistance R4, the second error amplifier and electric capacity C2;
The first end of described resistance R3 is the input of described voltage comparison module, second end of described resistance R3 and the first end of described resistance R4 are connected to the inverting input of described second error amplifier altogether, the second termination virtual signal ground of described resistance R4, the in-phase input end of described second error amplifier and output are respectively reference voltage terminal and the output of described voltage comparison module, between the output that described electric capacity C2 is connected to described second error amplifier and virtual signal ground.
4. Switching Power Supply as claimed in claim 1, it is characterized in that, described power switch is high pressure NMOS field effect transistor M1, and the grid of described high pressure NMOS field effect transistor M1, drain electrode and source electrode are respectively the control end of described power switch, input and output.
5. Switching Power Supply as claimed in claim 1, it is characterized in that, described voltage sample amplification module comprises resistance R5 and amplifier, the first end of described resistance R5 and the second end are respectively input and first output of described voltage sample amplification module, the in-phase input end of described amplifier connects the first end of described resistance R5, the inverting input of described amplifier and second end of described resistance R5 are connected to virtual signal ground altogether, and the output of described amplifier is the second output of described voltage sample amplification module.
6. Switching Power Supply as claimed in claim 1, it is characterized in that, described pulse width modulation module comprises:
Comparator, d type flip flop, clock generation circuit, the first inverter, the second inverter and the 3rd inverter;
The in-phase input end of described comparator and inverting input are respectively first input end and second input of described pulse width modulation module, the reseting controling end of d type flip flop described in the output termination of described comparator, the output of the 3rd inverter described in the input termination of described d type flip flop, the input termination virtual signal ground of described 3rd inverter, the clock end of described d type flip flop connects the output of described clock generation circuit, the input of described first inverter is connected with the input of the second inverter with the output of described d type flip flop respectively with output, the output of described second inverter is the output of described pulse width modulation module.
7. Switching Power Supply as claimed in claim 1, it is characterized in that, described input stage current rectifying and wave filtering circuit comprises rectifier diode D1 and filter capacitor C1, the anode of described rectifier diode D1 and negative electrode are respectively input and the output of described input stage current rectifying and wave filtering circuit, between the negative electrode that described filter capacitor C1 is connected to described rectifier diode D1 and ground.
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| CN101989074A (en) * | 2009-07-31 | 2011-03-23 | 成都芯源系统有限公司 | Switch adjusting circuit and method |
| CN202444416U (en) * | 2011-11-16 | 2012-09-19 | 深圳市明微电子股份有限公司 | Starting device without starting resistance |
| CN202872629U (en) * | 2012-10-15 | 2013-04-10 | 深圳市明微电子股份有限公司 | Switching power supply and constant voltage output controller thereof |
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| CN102904431A (en) | 2013-01-30 |
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