CN105703611A - Voltage feedback circuit of flyback switching power supply and flyback switching power supply - Google Patents
Voltage feedback circuit of flyback switching power supply and flyback switching power supply Download PDFInfo
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- CN105703611A CN105703611A CN201610140720.7A CN201610140720A CN105703611A CN 105703611 A CN105703611 A CN 105703611A CN 201610140720 A CN201610140720 A CN 201610140720A CN 105703611 A CN105703611 A CN 105703611A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
Abstract
The present invention provides a voltage feedback circuit of a flyback switching power supply and the flyback switching power supply. According to the technical scheme of the voltage feedback circuit of the flyback switching power supply, a fourth pin (4) of a photoelectric coupler (P1) is connected to an input voltage (VCC) through a first resistor (R1) to ensure the photoelectric coupler (P1) to always run in the active region, so that the photoelectric coupler is prevented from being saturated. With the presence of an output voltage, the current is transmitted to the base electrode of a first triode (Q1) via a third pin (3) of the photoelectric coupler (P1). In this way, a base voltage for switching on the first triode (Q1) is generated. A feedback signal is amplified by the first triode (Q1), and the collector of the first triode (Q1) transmits the feedback signal to the feedback pin of a PWM IC. In this way, the feedback can be accelerated, and the response time is shortened. The generation of the pulsed beam concentrated area is avoided, and the audio noise problem is solved.
Description
Technical field
The present invention relates to power circuit technical field, particularly relate to voltage feedback circuit and the inverse-excitation type switch power-supply of a kind of inverse-excitation type switch power-supply。
Background technology
Power supply is the requisite ingredient of various electronic equipment, and can the quality of its performance be directly connected to the technical specification of electronic equipment and work safely and reliably。
The effect of power supply is that the High AC voltage of externally input is converted into the DC voltage that electronic equipment can be suitable for。Different according to operation principle, power supply is broadly divided into linear power supply and the big class of Switching Power Supply two。Wherein, Switching Power Supply utilizes the time ratio of the open and close of pulse width modulation (PulseWidthModulation, PWM) IC control transistor, maintains stable output voltage, has been widely used at present on various electronic equipment and instrument。
Inverse-excitation type switch power-supply refers to the Switching Power Supply using flyback high frequency transformer isolation input and output loop, has the advantages such as structure is simpler, less costly, device is less, in the ratio that small-power switching power-supply market share is very big。Existing inverse-excitation type switch power-supply is generally made up of PWMIC, transformator, rectification filtering module, voltage feedback module and switching device, its work process is: after the High AC voltage outside accessing, PWMIC sends pulse signal and controls the opening and closing of switching device, when switching device is opened, enter the primary coil of transformator after external alternating voltage is rectified and energy is stored；When switching device is closed, in transformer, the energy of storage is discharged by secondary coil, the backward load stabilization output DC voltage of effect of rectified filtration module。The voltage feedback module of inverse-excitation type switch power-supply accesses output voltage, when output voltage increases or reduces, produce feedback signal, feedback signal transmission is to the feedback pin of PWMIC, PWMIC adjusts pulse signal to control ratio switch time of switching device, output voltage values is made to be adjusted, regulated output voltage。
The Voltage Feedback function of the feedback module of inverse-excitation type switch power-supply is mainly completed by photoelectrical coupler。Photoelectrical coupler is the device carrying out transmitting telecommunication number with light for medium, generally luminous organ (infrared light-emitting diode) and light-receiving device (photosensitive semiconductor pipe) are encapsulated in same shell, when input power up signal, luminous organ emits beam, light-receiving device just produces photoelectric current after accepting light, flow out from outfan, it is achieved thereby that " electric light electricity " conversion。Fig. 1 show the circuit diagram of the voltage feedback module of a kind of existing inverse-excitation type switch power-supply, photoelectrical coupler P1 ' has four pins, wherein the first pin 1 ' receives the voltage signal Vout of power output end, LEDs ON internal for photoelectrical coupler P1 ' is made to produce corresponding light intensity, photosensitive semiconductor pipe internal for photoelectrical coupler P1 ' produces the photoelectric current of correspondence after receiving light, feedback pin by the 4th pin 4 ' output to PWMIC, PWMIC controls the waveform of output pulse according to feedback signal, adjust the switching frequency of switch element, thus adjusting output voltage。
The transfer ratio (CTR) of general photoelectrical coupler is between 80% to 200%, and the multiple of amplification is less。Under the duty that inverse-excitation type switch power-supply is in underloading or zero load, owing to output voltage needs just to feed back to PWMIC through photoelectrical coupler, the response speed of feedback is slower, it may appear that pulsed beam current concentrated area, pulsed beam current concentration can produce audio-frequency noise, affects the quality of power supply。
Summary of the invention
It is an object of the invention to provide the voltage feedback circuit of a kind of inverse-excitation type switch power-supply, it is possible to Voltage Feedback is accelerated, shortening response time, it is to avoid pulsed beam current concentrated area occurs, thus avoiding the generation of audio-frequency noise。
The present invention also aims to provide a kind of inverse-excitation type switch power-supply, its Voltage Feedback speed is fast, and response time is short, it is possible to avoid the occurrence of audio-frequency noise。
For achieving the above object, present invention firstly provides the voltage feedback circuit of a kind of inverse-excitation type switch power-supply, the first resistance being electrically connected including: photoelectrical coupler and photoelectrical coupler and the first audion being electrically connected with photoelectrical coupler；
Described photo-coupler has the first pin, the second pin, the 3rd pin and the 4th pin, and described 4th pin and first resistance one end are connected, and described 3rd pin is connected with the base stage of described first audion；
One end of described first resistance is connected to the 4th pin of photoelectrical coupler, and the other end accesses input voltage；
The base stage of described first audion is connected with the 3rd pin of described photoelectrical coupler, grounded emitter, and colelctor electrode is connected with the feedback pin of the PWMIC of inverse-excitation type switch power-supply；
The output voltage of inverse-excitation type switch power-supply is entered by the first pin of photoelectrical coupler, and after voltage feedback circuit processes, feedback signal is transferred to the feedback pin of PWMIC by the colelctor electrode of described first audion。
The voltage feedback circuit of described inverse-excitation type switch power-supply also includes: the second resistance, the first diode, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 6th resistance, the 7th resistance, the 8th resistance and potential regulator；
One end of described second resistance is connected with the base stage of the 3rd pin of described photoelectrical coupler and the first audion, and the anode of the other end and the first diode is connected；
The anode of described first diode and the other end of the second resistance are connected, minus earth；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 3rd resistance, and the other end is connected with the first pin of described photoelectrical coupler；
One end of described 4th resistance is connected to the first pin of described photoelectrical coupler, and the other end is connected to the second pin of photoelectrical coupler；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 5th resistance, and the other end is connected to the second pin of photoelectrical coupler；
One end of described first electric capacity is connected to the second pin of photoelectrical coupler, and the other end is connected to the control pole of described potential regulator；
One end of described second electric capacity is connected to the second pin of photoelectrical coupler, and the other end is connected to one end of described 6th resistance；
One end of described 6th resistance is connected with described second electric capacity, and the other end is connected with the control pole of potential regulator；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 7th resistance, and the other end is connected to the control pole of described potential regulator；
One end of described 8th resistance is connected to the control pole of described potential regulator, other end ground connection；
The pole that controls of described potential regulator is connected to the common port of the first electric capacity, the 6th resistance, the 7th resistance and the 8th resistance, plus earth, and negative electrode connects the second pin of described photoelectrical coupler。
Described photoelectrical coupler is made up of the luminous organ being encapsulated in same shell and light-receiving device。
Described luminous organ is Light-Emitting Diode, described light-receiving device is photosensitive triode, the anode of Light-Emitting Diode is as the first pin of photoelectrical coupler, negative electrode is as the second pin of photoelectrical coupler, the emitter stage of photosensitive triode is as the 3rd pin of photo-coupler, and the colelctor electrode of photosensitive triode is as the 4th pin of photo-coupler。
The present invention also provides for a kind of inverse-excitation type switch power-supply, and including voltage feedback circuit, described voltage feedback circuit includes: the first resistance that photoelectrical coupler and photoelectrical coupler are electrically connected and the first audion being electrically connected with photoelectrical coupler；
Described photo-coupler has the first pin, the second pin, the 3rd pin and the 4th pin, and described 4th pin and first resistance one end are connected, and described 3rd pin is connected with the base stage of described first audion；
One end of described first resistance is connected to the 4th pin of photoelectrical coupler, and the other end accesses input voltage；
The base stage of described first audion is connected with the 3rd pin of described photoelectrical coupler, grounded emitter, and colelctor electrode is connected with the feedback pin of the PWCIC of inverse-excitation type switch power-supply；
The output voltage of inverse-excitation type switch power-supply is entered by the first pin of photoelectrical coupler, and after voltage feedback circuit processes, feedback signal is transferred to the feedback pin of PWMIC by the colelctor electrode of described first audion。
The voltage feedback circuit of described inverse-excitation type switch power-supply also includes: the second resistance, the first diode, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity, the second electric capacity, the 6th resistance, the 7th resistance, the 8th resistance and potential regulator；
One end of described second resistance is connected with the base stage of the 3rd pin of described photoelectrical coupler and the first audion, and the anode of the other end and the first diode is connected；
The anode of described first diode and the other end of the second resistance are connected, minus earth；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 3rd resistance, and the other end is connected with the first pin of described photoelectrical coupler；
One end of described 4th resistance is connected to the first pin of described photoelectrical coupler, and the other end is connected to the second pin of photoelectrical coupler；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 5th resistance, and the other end is connected to the second pin of photoelectrical coupler；
One end of described first electric capacity is connected to the second pin of photoelectrical coupler, and the other end is connected to the control pole of described potential regulator；
One end of described second electric capacity is connected to the second pin of photoelectrical coupler, and the other end is connected to one end of described 6th resistance；
One end of described 6th resistance is connected with described second electric capacity, and the other end is connected with the control pole of potential regulator；
The output voltage of inverse-excitation type switch power-supply is accessed in one end of described 7th resistance, and the other end is connected to the control pole of described potential regulator；
One end of described 8th resistance is connected to the control pole of described potential regulator, other end ground connection；
The pole that controls of described potential regulator is connected to the common port of the first electric capacity, the 6th resistance, the 7th resistance and the 8th resistance, plus earth, and negative electrode connects the second pin of described photoelectrical coupler。
Described photoelectrical coupler is made up of the luminous organ being encapsulated in same shell and light-receiving device。
Described luminous organ is Light-Emitting Diode, described light-receiving device is photosensitive triode, the anode of Light-Emitting Diode is as the first pin of photoelectrical coupler, negative electrode is as the second pin of photoelectrical coupler, the emitter stage of photosensitive triode is as the 3rd pin of photo-coupler, and the colelctor electrode of photosensitive triode is as the 4th pin of photo-coupler。
Beneficial effects of the present invention: the voltage feedback circuit of inverse-excitation type switch power-supply provided by the invention and inverse-excitation type switch power-supply, the 4th pin arranging photoelectrical coupler accesses input voltage by the first resistance, phototriode is made to turn on, guarantee that photoelectrical coupler works at active area all the time, it is prevented that its generation is saturated；When there being output voltage, electric current is made to be transferred to the base stage of the first audion by the 3rd pin of photoelectrical coupler by the effect of photoelectrical coupler, produce the base voltage making the first triode conducting required, feedback signal can be amplified by the first audion, and by the colelctor electrode of the first audion, feedback signal is sent to the feedback pin of PWMIC, it is possible to accelerate feedback, shorten response time, avoid the occurrence of pulsed beam current concentrated area, solve audio-frequency noise problem。
Accompanying drawing explanation
In order to be able to be further understood that inventive feature and technology contents, refer to the detailed description below in connection with the present invention and accompanying drawing, but accompanying drawing only provides reference and use is described, be not used for the present invention is any limitation as。
In accompanying drawing,
Fig. 1 is the circuit diagram of the voltage feedback module of existing inverse-excitation type switch power-supply；
Fig. 2 is the circuit diagram of the voltage feedback circuit of the inverse-excitation type switch power-supply of the present invention。
Detailed description of the invention
For further setting forth the technological means and effect thereof that the present invention takes, it is described in detail below in conjunction with the preferred embodiments of the present invention and accompanying drawing thereof。
Refer to Fig. 2, present invention firstly provides the voltage feedback circuit of a kind of inverse-excitation type switch power-supply, the first resistance R1 being electrically connected including: photoelectrical coupler P1 and photoelectrical coupler and the first audion Q1 being electrically connected with photoelectrical coupler P1。
Optical coupling utensil P1 has the first pin the 1, second pin the 2, the 3rd pin 3 and the 4th pin 4, and the 4th pin 4 is connected with one end of the first resistance R1, the 3rd pin 3 with the base stage of the first audion Q1 be connected。
Photoelectrical coupler P1 is made up of the luminous organ being encapsulated in same shell and light-receiving device, and in the present embodiment, luminous organ is preferably Light-Emitting Diode, and light-receiving device is preferably photosensitive triode。Wherein the anode of light emitting diode is as first pin 1 of photoelectrical coupler P1, the negative electrode of light emitting diode is as second pin 2 of photoelectrical coupler P1, the emitter stage of phototriode is as the 3rd pin 3 of photo-coupler P1, and the colelctor electrode of phototriode is as the 4th pin 4 of photo-coupler P1。
One end of first resistance R1 is connected to the 4th pin 4 of photoelectrical coupler, and the other end accesses input voltage VCC。
The base stage of the first audion Q1 is connected with the 3rd pin 3 of described photoelectrical coupler P1, grounded emitter, and colelctor electrode is connected with the feedback pin of the PWMIC of inverse-excitation type switch power-supply。
The voltage feedback circuit of this inverse-excitation type switch power-supply also includes: the second resistance R2, the first diode D1, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the second electric capacity C2, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and potential regulator IC1。
Specifically, one end of the second resistance R2 is connected with the 3rd pin 3 of described photoelectrical coupler P1 and the base stage of the first audion Q1, and the anode of the other end and the first diode D1 is connected；The anode of the first diode D1 and the other end of the second resistance R2 are connected, minus earth；The output voltage Vout of inverse-excitation type switch power-supply is accessed in one end of 3rd resistance R3, and the other end is connected with first pin 1 of described photoelectrical coupler P1；One end of 4th resistance R4 is connected to first pin 1 of photoelectrical coupler P1, and the other end is connected to second pin 2 of photoelectrical coupler P1；The output voltage Vout of inverse-excitation type switch power-supply is accessed in one end of 5th resistance R5, and the other end is connected to second pin 2 of photoelectrical coupler P1；One end of first electric capacity C1 is connected to second pin 2 of photoelectrical coupler P1, and the other end is connected to the control pole of potential regulator IC1；One end of second electric capacity C2 is connected to second pin 2 of photoelectrical coupler P1, and the other end is connected to one end of described 6th resistance R6；One end of 6th resistance R6 is connected with the second electric capacity C2, and the other end is extremely connected with the control of potential regulator IC1；The output voltage Vout of inverse-excitation type switch power-supply is accessed in one end of 7th resistance R7, and the other end is connected to the control pole of described potential regulator IC1；One end of 8th resistance R8 is connected to the control pole of potential regulator IC1, other end ground connection；The pole that controls of potential regulator IC1 is connected to the common port of the first electric capacity C1, the 6th resistance R6, the 7th resistance R7 and the eight resistance R8, plus earth, and negative electrode connects second pin 2 of described photoelectrical coupler P1。
The output voltage Vout of inverse-excitation type switch power-supply is entered by first pin 1 of photoelectrical coupler P1, and after voltage feedback circuit processes, feedback signal is transferred to the feedback pin of PWMIC by the colelctor electrode of the first audion Q1, completes Voltage Feedback work。
Especially, it should be noted that, owing in the 4th pin 4 i.e. photoelectrical coupler P1 of photoelectrical coupler P1, the colelctor electrode of photosensitive triode accesses input voltage VCC by the first resistance R1, the phototriode in photoelectrical coupler P1 is made to turn on, it is able to ensure that photoelectrical coupler P1 works at active area all the time, does not occur saturated。
When output voltage Vout produces, output voltage Vout enters in voltage feedback circuit through the 3rd resistance R3 and the seven resistance R7, dividing potential drop through the 3rd resistance R3, output voltage Vout transmits the first pin 1 to photoelectrical coupler P1, dividing potential drop through the 7th resistance R7, output voltage Vout transmission makes potential regulator IC1 turn on to the control pole of potential regulator IC1, voltage ground by second pin 2 of photoelectrical coupler P1, in photoelectrical coupler P1, the anode of light emitting diode produces voltage difference with negative electrode and turns on and send the optical signal corresponding with output voltage Vout, phototriode in optical signals photoelectrical coupler P1 receives, feedback current is transferred to the base stage of the first audion Q1 by photoelectrical coupler P1 through the emitter stage of the 3rd i.e. phototriode of pin 3, produce the base voltage that the first audion Q1 conducting is required, and make the first audion Q1 conducting, owing to the amplification of audion can to 100 to 200 times, feedback signal can be amplified by the base stage of the first audion Q1, and by the colelctor electrode of the first audion Q1, feedback signal is sent to the feedback pin of PWMIC, in this way, accelerating potential feeds back, shorten response time, utilize the voltage feedback circuit of the inverse-excitation type switch power-supply of the present invention, pulsed beam current concentrated area can be avoided the occurrence of, solve audio-frequency noise problem。
Based on same inventive concept, the present invention also provides for a kind of inverse-excitation type switch power-supply, and it includes the voltage feedback circuit of above-mentioned inverse-excitation type switch power-supply as described in Figure 2 so that Voltage Feedback speed is fast, and response time is short, it is possible to avoid the occurrence of audio-frequency noise。No longer it is repeated voltage feedback circuit describing herein。
In sum, the voltage feedback circuit of the inverse-excitation type switch power-supply of the present invention and inverse-excitation type switch power-supply, the 4th pin arranging photoelectrical coupler accesses input voltage by the first resistance, makes phototriode turn on, guarantee that photoelectrical coupler works at active area all the time, it is prevented that its generation is saturated；When there being output voltage, electric current is made to be transferred to the base stage of the first audion by the 3rd pin of photoelectrical coupler by the effect of photoelectrical coupler, produce the base voltage making the first triode conducting required, feedback signal can be amplified by the first audion, and by the colelctor electrode of the first audion, feedback signal is sent to the feedback pin of PWMIC, it is possible to accelerate feedback, shorten response time, avoid the occurrence of pulsed beam current concentrated area, solve audio-frequency noise problem。
The above, for the person of ordinary skill of the art, it is possible to conceive according to technical scheme and technology and make other various corresponding changes and deformation, and all these change and deform the protection domain that all should belong to appended claims of the present invention。
Claims (8)
1. the voltage feedback circuit of an inverse-excitation type switch power-supply, it is characterized in that, including: the first resistance (R1) that photoelectrical coupler (P1) and photoelectrical coupler (P1) are electrically connected and the first audion (Q1) being electrically connected with photoelectrical coupler (P1)；
Described photo-coupler (P1) has the first pin (1), the second pin (2), the 3rd pin (3) and the 4th pin (4), described 4th pin (4) is connected with one end of the first resistance (R1), and described 3rd pin (3) is connected with the base stage of described first audion (Q1)；
One end of described first resistance (R1) is connected to the 4th pin (4) of photoelectrical coupler, and the other end accesses input voltage (VCC)；
The base stage of described first audion (Q1) is connected with the 3rd pin (3) of described photoelectrical coupler (P1), grounded emitter, and colelctor electrode is connected with the feedback pin of the PWMIC of inverse-excitation type switch power-supply；
The output voltage (Vout) of inverse-excitation type switch power-supply is entered by first pin (1) of photoelectrical coupler (P1), after voltage feedback circuit processes, feedback signal is transferred to the feedback pin of PWMIC by the colelctor electrode of described first audion (Q1)。
2. the voltage feedback circuit of inverse-excitation type switch power-supply as claimed in claim 1, it is characterized in that, also include: the second resistance (R2), the first diode (D1), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the first electric capacity (C1), the second electric capacity (C2), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8) and potential regulator (IC1)；
One end of described second resistance (R2) is connected with the base stage of the 3rd pin (3) of described photoelectrical coupler (P1) and the first audion (Q1), and the anode of the other end and the first diode (D1) is connected；
The anode of described first diode (D1) and the other end of the second resistance (R2) are connected, minus earth；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 3rd resistance (R3), and the other end is connected with first pin (1) of described photoelectrical coupler (P1)；
One end of described 4th resistance (R4) is connected to first pin (1) of described photoelectrical coupler (P1), and the other end is connected to second pin (2) of photoelectrical coupler (P1)；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 5th resistance (R5), and the other end is connected to second pin (2) of photoelectrical coupler (P1)；
One end of described first electric capacity (C1) is connected to second pin (2) of photoelectrical coupler (P1), and the other end is connected to the control pole of described potential regulator (IC1)；
One end of described second electric capacity (C2) is connected to second pin (2) of photoelectrical coupler (P1), and the other end is connected to one end of described 6th resistance (R6)；
One end of described 6th resistance (R6) is connected with described second electric capacity (C2), and the other end is connected with the control pole of potential regulator (IC1)；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 7th resistance (R7), and the other end is connected to the control pole of described potential regulator (IC1)；
One end of described 8th resistance (R8) is connected to the control pole of described potential regulator (IC1), other end ground connection；
The control pole of described potential regulator (IC1) is connected to the common port of the first electric capacity (C1), the 6th resistance (R6), the 7th resistance (R7) and the 8th resistance (R8), plus earth, negative electrode connects second pin (2) of described photoelectrical coupler (P1)。
3. the voltage feedback circuit of inverse-excitation type switch power-supply as claimed in claim 1, it is characterised in that described photoelectrical coupler (P1) is made up of the luminous organ being encapsulated in same shell and light-receiving device。
4. the voltage feedback circuit of inverse-excitation type switch power-supply as claimed in claim 3, it is characterized in that, described luminous organ is Light-Emitting Diode, described light-receiving device is photosensitive triode, the anode of Light-Emitting Diode is as first pin (1) of photoelectrical coupler (P1), negative electrode is as second pin (2) of photoelectrical coupler (P1), the emitter stage of photosensitive triode is as the 3rd pin (3) of photo-coupler (P1), and the colelctor electrode of photosensitive triode is as the 4th pin (4) of photo-coupler (P1)。
5. an inverse-excitation type switch power-supply, it is characterized in that, including voltage feedback circuit, described voltage feedback circuit includes: the first resistance (R1) that photoelectrical coupler (P1) and photoelectrical coupler (P1) are electrically connected and the first audion (Q1) being electrically connected with photoelectrical coupler (P1)；
Described photo-coupler (P1) has the first pin (1), the second pin (2), the 3rd pin (3) and the 4th pin (4), described 4th pin (4) is connected with one end of the first resistance (R1), and described 3rd pin (3) is connected with the base stage of described first audion (Q1)；
One end of described first resistance (R1) is connected to the 4th pin (4) of photoelectrical coupler, and the other end accesses input voltage (VCC)；
The base stage of described first audion (Q1) is connected with the 3rd pin (3) of described photoelectrical coupler (P1), grounded emitter, and colelctor electrode is connected with the feedback pin of the PWCIC of inverse-excitation type switch power-supply；
The output voltage (Vout) of inverse-excitation type switch power-supply is entered by first pin (1) of photoelectrical coupler (P1), after voltage feedback circuit processes, feedback signal is transferred to the feedback pin of PWMIC by the colelctor electrode of described first audion (Q1)。
6. inverse-excitation type switch power-supply as claimed in claim 5, it is characterized in that, described voltage feedback circuit also includes: the second resistance (R2), the first diode (D1), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the first electric capacity (C1), the second electric capacity (C2), the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8) and potential regulator (IC1)；
One end of described second resistance (R2) is connected with the base stage of the 3rd pin (3) of described photoelectrical coupler (P1) and the first audion (Q1), and the anode of the other end and the first diode (D1) is connected；
The anode of described first diode (D1) and the other end of the second resistance (R2) are connected, minus earth；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 3rd resistance (R3), and the other end is connected with first pin (1) of described photoelectrical coupler (P1)；
One end of described 4th resistance (R4) is connected to first pin (1) of described photoelectrical coupler (P1), and the other end is connected to second pin (2) of photoelectrical coupler (P1)；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 5th resistance (R5), and the other end is connected to second pin (2) of photoelectrical coupler (P1)；
One end of described first electric capacity (C1) is connected to second pin (2) of photoelectrical coupler (P1), and the other end is connected to the control pole of described potential regulator (IC1)；
One end of described second electric capacity (C2) is connected to second pin (2) of photoelectrical coupler (P1), and the other end is connected to one end of described 6th resistance (R6)；
One end of described 6th resistance (R6) is connected with described second electric capacity (C2), and the other end is connected with the control pole of potential regulator (IC1)；
The output voltage (Vout) of inverse-excitation type switch power-supply is accessed in one end of described 7th resistance (R7), and the other end is connected to the control pole of described potential regulator (IC1)；
One end of described 8th resistance (R8) is connected to the control pole of described potential regulator (IC1), other end ground connection；
The control pole of described potential regulator (IC1) is connected to the common port of the first electric capacity (C1), the 6th resistance (R6), the 7th resistance (R7) and the 8th resistance (R8), plus earth, negative electrode connects second pin (2) of described photoelectrical coupler (P1)。
7. inverse-excitation type switch power-supply as claimed in claim 5, it is characterised in that described photoelectrical coupler (P1) is made up of the luminous organ being encapsulated in same shell and light-receiving device。
8. inverse-excitation type switch power-supply as claimed in claim 7, it is characterized in that, described luminous organ is Light-Emitting Diode, described light-receiving device is photosensitive triode, the anode of Light-Emitting Diode is as first pin (1) of photoelectrical coupler (P1), negative electrode is as second pin (2) of photoelectrical coupler (P1), the emitter stage of photosensitive triode is as the 3rd pin (3) of photo-coupler (P1), and the colelctor electrode of photosensitive triode is as the 4th pin (4) of photo-coupler (P1)。
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| CN201610140720.7A CN105703611A (en) | 2016-03-11 | 2016-03-11 | Voltage feedback circuit of flyback switching power supply and flyback switching power supply |
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| CN107968573A (en) * | 2017-12-07 | 2018-04-27 | 深圳市华星光电技术有限公司 | Circuit of reversed excitation |
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