CN204030996U - A kind of reverse exciting switching voltage regulator circuit - Google Patents

A kind of reverse exciting switching voltage regulator circuit Download PDF

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Publication number
CN204030996U
CN204030996U CN201420272532.6U CN201420272532U CN204030996U CN 204030996 U CN204030996 U CN 204030996U CN 201420272532 U CN201420272532 U CN 201420272532U CN 204030996 U CN204030996 U CN 204030996U
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China
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circuit
pin
resistance
output
switching
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CN201420272532.6U
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Chinese (zh)
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吕华伟
何建鹏
黄晓敏
杨东泽
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昂宝电子(上海)有限公司
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Abstract

The utility model relates to a kind of reverse exciting switching voltage regulator circuit, comprise: current rectifying and wave filtering circuit, flyback switching circuit, output filter circuit, feedback sampling circuit, power supply circuits, drive circuit, input voltage power down detecting and X capacitance detecting and discharge circuit and control circuit, described control circuit comprises control chip, the first resistance, thermal-shutdown circuit and the second resistance, and described control chip comprises: drive pin; Output feedback pin; System protection pin, described system protection pin is connected with described flyback switching circuit via described the first resistance, and is connected to ground via thermal-shutdown circuit; Power supply input pin; Current sample pin, described current sample pin is connected with unearthed one end of the sampling resistor of the transformer primary avris of described flyback switching circuit via described the second resistance; High voltage startup pin, described high voltage startup pin and described input voltage power down detecting and X capacitance detecting and discharge circuit are connected; And chip lower margin.

Description

A kind of reverse exciting switching voltage regulator circuit

Technical field

The utility model technology relates to a kind of switching power circuit, particularly a kind of switching power circuit of novel flyback structure.

Background technology

Current era, it is excessive that human society faces energy resource consumption, the pressure that environmental disruption is serious, energy-saving and emission-reduction are extremely urgent, electric equipment and electronic product, for reducing energy resource consumption, must be optimized its power supply changeover device, realize higher conversion efficiency and lower static stand-by power consumption.In middle low power field, flyback structure is because with low cost, and simplicity of design is generally adopted, at present on the market at the inverse-excitation type switch power-supply using, and its conversion efficiency, also there is further improved space in the technical indicators such as stand-by power consumption.Along with various new standard of energy, the appearance of safety standard, will propose higher technical requirement to existing power supply changeover device.

Utility model content

The purpose of this utility model is to provide a kind of inverse that at least overcomes one of above-mentioned technical bottleneck.

According to reverse exciting switching voltage regulator circuit of the present utility model, comprising: current rectifying and wave filtering circuit (1), it is transfused to alternating current and carries out rectification and carry out EMI Filtering; Flyback switching circuit (2), it is connected with the output of described current rectifying and wave filtering circuit (1); Output filter circuit (3), it is connected with the output of described flyback switching circuit (2); Feedback sampling circuit (4), its output to described output filter circuit (3) is sampled; Power supply circuits (6), it is connected between control circuit (5) and described flyback switching circuit (2), to described control circuit power supply; Drive circuit (8), it is connected between described control circuit and described flyback switching circuit (2), and the break-make of described flyback switching circuit (2) is controlled; Input voltage power down detecting and X capacitance detecting and discharge circuit (9), the X electric capacity of two input and described current rectifying and wave filtering circuit (1) in parallel, output is connected with the high voltage startup pin (HV) of control chip (U1); Control circuit (5), described control circuit (5) comprises control chip (U1), the first resistance (Rovp), thermal-shutdown circuit (OTP) and the second resistance (Rocp), described control chip (U1) comprising: drive pin (GATE), described driving pin (GATE) is connected with described drive circuit (8); Output feedback pin (FB), described output feedback pin (FB) is connected with the output of described feedback sampling circuit (4); System protection pin (PRT), described system protection pin (PRT) is connected to described flyback switching circuit (2) via described the first resistance (Rovp) and carries out overvoltage protection with the tie point of described power supply circuits, and described system protection pin (PRT) carries out overheat protector via thermal-shutdown circuit (OTP) with being connected to; Power supply input pin (VDD), described power supply input pin (VDD) is connected with described power supply circuits (6), for powering to described control chip (U1); Current sample pin (CS), described current sample pin (CS) is connected with described flyback switching circuit (2) via described the second resistance (Rocp); High voltage startup pin (HV), described high voltage startup pin (HV) is connected with the output of described input voltage power down detecting and X capacitance detecting and discharge circuit (9); And chip lower margin (GND), described chip lower margin (GND) ground connection.

According to above-mentioned reverse exciting switching voltage regulator circuit, wherein, described flyback switching circuit (2) is being connected in series of flyback transformer, switching tube, primary current sampling resistor, described power supply circuits (6) are connected with auxiliary group of winding of described flyback transformer, described drive circuit (8) is connected with the grid of described switching tube, and described the second resistance (Rocp) is connected with unearthed one end of described primary current sampling resistor.

According to above-mentioned reverse exciting switching voltage regulator circuit, wherein, in the time that described switching tube is connected, the output of described feedback sampling circuit (4) is imported into described output feedback pin (FB), the current sampling signal of described flyback switching circuit (2) flow into described current sample pin (CS) via described the second resistance (Rocp), and described control chip (U1) is exported drive pulse signal based on above-mentioned two sampled signals by described driving pin (GATE).

According to above-mentioned reverse exciting switching voltage regulator circuit; wherein; have when described flyback switching circuit (2) switching tube cut-off time; described control chip (U1) flows out electric current from described current sample pin (CS); this outflow electric current is at the upper voltage that produces of described the second resistance (Rocp); for overcurrent protection compensation, the resistance value of described the second resistance (Rocp) is adjustable.

According to above-mentioned reverse exciting switching voltage regulator circuit, wherein, in the time of described switching tube cut-off, described control chip (U1) detects concussion voltage via described drive circuit (8) from described flyback switching circuit (2), to calculate the demagnetization time in inside based on this concussion voltage.

According to above-mentioned reverse exciting switching voltage regulator circuit; wherein; described thermal-shutdown circuit (OTP) is the tandem compound of diode and negative temperature coefficient resister (NTC); the anode of diode is connected with described system protection pin (PRT), and described system protection pin (PRT) is ground connection via described thermal-shutdown circuit (OTP).

According to above-mentioned reverse exciting switching voltage regulator circuit; wherein; described thermal-shutdown circuit (OTP) also has the 3rd resistance, and described the 3rd resistance is connected in series at cathode side and described diode, the described negative temperature coefficient resister (NTC) of described diode.

According to above-mentioned reverse exciting switching voltage regulator circuit, wherein, also there is overshoot absorbing circuit (7), described overshoot absorbing circuit (7) is connected to the two ends of the former limit winding of described flyback transformer.

According to above-mentioned reverse exciting switching voltage regulator circuit; wherein; one end of described the first resistance (Rovp) is connected to described system protection pin (PRT); the other end is connected to the auxiliary winding of described flyback transformer and the tie point of described power supply circuits (6); described system protection pin (PRT) detects the output voltage signal being obtained by the electric current of ramp metering chip (U1) by described the first resistance (Rovp); to carry out overvoltage protection, shutdown system in the time that overvoltage occurs in output.

According to above-mentioned reverse exciting switching voltage regulator circuit; wherein; in the time that described switching tube turn-offs; described system protection pin (PRT) is connected to the tie point of described the first resistance (Rovp) and described thermal-shutdown circuit (OTP); described the first resistance (Rovp), described diode, described negative temperature coefficient resister (NTC) are connected successively; detect the resonance information of information of voltage, demagnetization information and the transformer primary side winding of auxiliary group of winding by the signal of described system protection pin, the detecting of demagnetizing.

According to inverse-excitation type switch power-supply circuit of the present utility model, realize the functions such as overvoltage protection, overheat protector, overcurrent protection compensation, demagnetization detection, power down protection, possess stand-by power consumption low; efficiency is high; the features such as start-up time is short, and EMI radiation is low, and can meet various safety standards

brief description of the drawings

Fig. 1 is the schematic diagram of the reverse exciting switching voltage regulator circuit that relates to of the utility model;

Fig. 2 is the circuit for illustrating that OVP and OTP protection timesharing detect;

Fig. 3 is the figure that the concrete connection of OTP circuit is shown;

Fig. 4 is the figure that 2 methods of attachment of absorbing circuit AB are shown;

Fig. 5 is the figure that the method for attachment of drive circuit CD point-to-point transmission is shown;

Fig. 6 shows and shows overcurrent protection Circuit tuning and the drive circuit schematic diagram as demagnetization testing circuit;

Fig. 7 is the figure that the method for attachment of power supply circuits GH point-to-point transmission is shown;

Fig. 8 is the oscillogram of the voltage of corresponding position when demagnetization detects and OCP compensates;

Fig. 9 is the schematic diagram of input voltage power down circuit for detecting, X capacitance detecting and discharge circuit.

Embodiment

Feature and the exemplary embodiment of the utility model various aspects will be described in detail below.Many details have been contained in description below, to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can implement some details in these details in the case of not needing.Below the description of embodiment is only used to by illustrating that example of the present utility model provides the clearer understanding of the utility model.The utility model is never limited to any concrete configuration proposing below, but under the prerequisite that does not depart from spirit of the present utility model, has covered any amendment, replacement and the improvement of coherent element or parts.

The utility model circuit is developed based on inverse-excitation type switch power-supply circuit, and Fig. 1 is the schematic diagram of the reverse exciting switching voltage regulator circuit that relates to of the utility model.With reference to accompanying drawing, the utility model is described.Reverse exciting switching voltage regulator circuit comprises AC input rectifying, EMI (electromagnetic interference) filter circuit 1, flyback switching circuit 2, output filter circuit 3, feedback sampling circuit 4, control circuit 5, power supply circuits 6, overshoot absorbing circuit (also referred to as absorbing circuit) 7, drive circuit 8 and input voltage power down (Brownout) detecting and X capacitance detecting and discharge circuit 9.

Below, describe in detail according to each circuit unit included in the inverse-excitation type switch power-supply circuit of the utility model embodiment.Wherein:

Rectification, EMI filter circuit 1 comprise that fuse FUSE, two-stage common mode filtering inductance, X electric capacity (CX1), piezo-resistance MOV, rectifier bridge, output filter capacitor part form, and are transfused to alternating current and carry out rectification and carry out EMI Filtering.

Flyback switching circuit 2 is connected with the output of described current rectifying and wave filtering circuit 1, and comprises flyback transformer T, switch MOS FET pipe (field-effect transistor), primary current sample resistance.

Output filter circuit 3 is connected with the output of described flyback switching circuit 2, comprises output rectifier diode, two major parts of filter capacitor.On rectifier diode, be parallel with resistance capaciting absorpting circuit (hereinafter referred to as RC absorbing circuit), RC absorbing circuit can be adjusted as required or not use.In addition, for different output ripple requirements, output filter circuit can increase π type filter circuit or common mode filtering circuit.

Feedback sampling circuit 4 is sampled to the output of described output filter circuit 3, comprise that voltage stabilizing circuit (for example TL431), photoelectrical coupler (hereinafter to be referred as light lotus root) and feedback resistance electric capacity form, output voltage is sampled, by TL431 loop adjustment, feed back in the control chip of former limit by-pass cock MOSFET pipe duty ratio.

Control circuit 5 is a pwm chip and necessary peripheral auxiliary element as its main devices of control module.This pwm chip is for example the control chip of OB2282 or similar functions, and this pwm chip comprises 8 pin altogether, respectively:

1. grid drives pin GATE, for the switch of control switch pipe (MOSFET), is connected with drive circuit.In the time that driving is closed, this pin is also multiplexing in demagnetization measuring ability.

2. output feedback pin FB, is connected with the output of described feedback sampling circuit 4, is connected with light lotus root, by light lotus root, feedback signal is inputted to chip.

3. system protection pin PRT, for system overheat protector, (OVP) protection of outside output overvoltage and demagnetization and Valley-Switching detecting.System protection pin PRT is output over-voltage protection and excess temperature (OTP) Protective signal multiplex pin; connect flyback switching circuit 2 by Rocp resistance (detecting output over-voltage protection resistance);; be connected to the joint of auxiliary group of winding and power supply circuits; flow into chip current for the demagnetization platform of powering on winding by sampling and obtain output voltage information, in the time there is output overvoltage, protect.

System protection pin can connect an OTP protective circuit to ground, realizes overheat protector in realizing output over-voltage protection, and OTP protection does not interfere with each other with OVP protection, can realize respectively or simultaneously this function.

Except this pin of above function also can be used for detecting the demagnetization time and carry out Valley-Switching detecting.

4. the input pin VDD that powers, is connected with power supply circuits 6, for chip power supply.

5. current sample pin CS, for the voltage signal of transformer primary side electric current on sample resistance of sampling, this pin closes to have no progeny at MOSFET pipe simultaneously and flows out an electric current, for compensating output overcurrent protection (OCP) threshold value.

6. high voltage startup pin HV, be connected with the output of input voltage power down detecting and X capacitance detecting and discharge circuit 9, pull out electro-detection and the detection of X capacitor discharge for high voltage startup, power down (Brownout) detection, input plug, be connected with the output of input voltage power down detecting and X capacitance detecting and discharge circuit 9.

7. chip lower margin GND, the reference ground of chip.

Here, current sample pin CS flows into this pin after current sampling signal is by RC filtering.Output feedback pin FB and current sample pin CS produce PWM (pulse duration adjustment) output by chip internal computing.

System protection pin PRT is that output voltage detects and the multiplexing pin of temperature detection, by Rovp resistance detection output voltage signal, if overvoltage protection (OVP), system closing occur in output.Detect output over-voltage protection (OVP) resistance R ovp one end and be connected to system protection pin PRT and OTP joint, the other end is connected to the tie point of power supply circuits and auxiliary group of winding.

Fig. 2 is the circuit for illustrating that OVP and OTP protection timesharing detect.

In the circuit shown in Fig. 2; Rovp resistance one end is connected to auxiliary winding; the other end is received OTP circuit; in the time that switch MOS FET pipe turn-offs; on system protection pin PRT, can detect the resonance information of information of voltage, demagnetization information and the transformer primary side winding of auxiliary group of winding; use the circuit shown in Fig. 2 except realizing the detecting of demagnetization time, also can be used for detecting resonance the lowest point, former limit, realize quasi-resonance (QR) Valley-Switching.

This circuit and common QR resonance chip are different, the main distinction is that common QR chip demagnetization detecting is to realize by electric resistance partial pressure, and connect a diode except increasing in the middle of pwm chip OB2282 divider resistance, also can use a negative temperature coefficient resister NTC to realize dividing potential drop.

Fig. 3 is the figure of the concrete connection of OTP circuit, negative temperature coefficient resister (thermo-sensitive resistor) NTC, resistance R and diode are connected to ground, the voltage variation with temperature producing on the branch road of negative temperature coefficient resister (thermo-sensitive resistor) NTC, resistance R and diode series connection by the reference current flowing out, carry out detecting system temperature, in the time that system temperature is too high, chip can be inputted overheat protector, stops driver output.Wherein, resistance R and negative temperature coefficient resister NTC and diode can switches, and R also can save, connection as shown in Figure 3, but be not limited in three kinds of methods of attachment of Fig. 3.

Fig. 4 is the figure that 2 methods of attachment of absorbing circuit AB are shown, Fig. 5 is the figure that the method for attachment of drive circuit CD point-to-point transmission is shown, Fig. 7 is the figure that the method for attachment of power supply circuits GH point-to-point transmission is shown.

Absorbing circuit 7 is connected to A, B 2 points in circuit, can connect by the whole bag of tricks as shown in Figure 4.Drive circuit 8 is connected between control circuit 5 and described flyback switching circuit 2, and control circuit 5 is powered, and is connected to C (grid drives pin GATE), D 2 points in circuit, can connect by the whole bag of tricks as shown in Figure 5.Power supply circuits 6 are connected to G (power supply input pin VDD), H 2 points in circuit, can connect by the whole bag of tricks as shown in Figure 7, the connection of above-mentioned absorbing circuit 7, drive circuit 8, power supply circuits 6 is not limited to, shown in diagram, can change according to different system requirements.

Fig. 6 shows overcurrent protection Circuit tuning and the drive circuit schematic diagram as demagnetization testing circuit.Fig. 8 is the oscillogram of the voltage of corresponding position when demagnetization detects and OCP compensates.

The schematic diagram when dotted arrow of Fig. 6 illustrates drive circuit as demagnetization testing circuit.Drive circuit 8 closes to have no progeny at switch MOS FET pipe and can be used as demagnetization testing circuit, because after grid drives pin GATE to close and demagnetizes and finish, transformer primary side inductance and MOSFET junction capacitance form resonance, in the time that resonance occurs, electric capacity and arrow as shown in phantom in Figure 6, and shown in Fig. 8, concussion voltage is managed drain electrode by MOSFET and is coupled on grid driving pin GATE with the junction capacitance of grid, chip internal is detected this concussion voltage, this concussion voltage is as shown in the voltage schematic diagram of the driving pin GATE of Fig. 8, chip internal can calculate the demagnetization time by this concussion voltage.This demagnetization time coordination internal algorithm circuit can be realized overcurrent protection accurately (OCP) function.

Except the built-in protection of OCP accurately loop, the outside that pwm chip OB2282 also can realize OCP protection regulates.Shown in arrow as shown in solid line in Fig. 6, this outside regulates carries out as follows: after grid drives pin GATE to close, chip internal flows out an electric current from current sample pin CS, on Rocp resistance, produce a voltage by this electric current, this voltage is detected by chip internal, this voltage is as shown in the CS of Fig. 8, for compensating output OCP threshold value, so can regulate OCP threshold value by the resistance value that regulates Rocp resistance.

Fig. 9 is the schematic diagram of input voltage power down circuit for detecting, X capacitance detecting and discharge circuit 9.

Pwm chip OB2282 high voltage startup pin HV is connected with the negative electrode of two diodes by resistance, after plug-in, electric current flows into chip by diode and resistance, to power supply input pin VDD place capacitor charging, when VDD place, capacitance voltage reaches after rated voltage, chip enable work.When normal work; high voltage startup pin HV is by the AC-input voltage at the electric circuit inspection X electric capacity two ends shown in Fig. 9; when voltage is during lower than chip data table (datasheet) set point, there is power down (brownout) protection, stop grid and drive pin GATE output.Pull out after electricity, AC wave shape disappears.Chip is coordinated and can be detected above-mentioned phenomenon by the circuit shown in Fig. 9 and internal circuit, and moves by X capacitor discharging circuit after detecting, and bleeds off fast X capacitive charge storage, meets safety demand.

Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art all understand, can carry out various amendments, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present utility model that limited by claims or its equivalent.In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, instead of restrictive, unless separately there is concrete instruction.Make to separate or the ability of combination while not knowing when term is also contemplated as, the combination of assembly or step also will be considered to record.

Claims (10)

1. a reverse exciting switching voltage regulator circuit, comprising:
Current rectifying and wave filtering circuit (1), it is transfused to alternating current and carries out rectification and carry out EMI Filtering;
Flyback switching circuit (2), it is connected with the output of described current rectifying and wave filtering circuit (1);
Output filter circuit (3), it is connected with the output of described flyback switching circuit (2);
Feedback sampling circuit (4), its output to described output filter circuit (3) is sampled;
Power supply circuits (6), it is connected between control circuit (5) and described flyback switching circuit (2), to described control circuit power supply;
Drive circuit (8), it is connected between described control circuit and described flyback switching circuit (2), and the break-make of described flyback switching circuit (2) is controlled;
Input voltage power down detecting and X capacitance detecting and discharge circuit (9), the X electric capacity of two input and described current rectifying and wave filtering circuit (1) in parallel, output is connected with the high voltage startup pin (HV) of control chip (U1);
Control circuit (5); described control circuit (5) comprises control chip (U1), the first resistance (Rovp), thermal-shutdown circuit (OTP) and the second resistance (Rocp), and described control chip (U1) comprising:
Drive pin (GATE), described driving pin (GATE) is connected with described drive circuit (8);
Output feedback pin (FB), described output feedback pin (FB) is connected with the output of described feedback sampling circuit (4);
System protection pin (PRT), described system protection pin (PRT) is connected to described flyback switching circuit (2) via described the first resistance (Rovp) and carries out overvoltage protection with the tie point of described power supply circuits, and described system protection pin (PRT) carries out overheat protector via thermal-shutdown circuit (OTP) with being connected to;
Power supply input pin (VDD), described power supply input pin (VDD) is connected with described power supply circuits (6), for powering to described control chip (U1);
Current sample pin (CS), described current sample pin (CS) is connected with described flyback switching circuit (2) via described the second resistance (Rocp);
High voltage startup pin (HV), described high voltage startup pin (HV) is connected with the output of described input voltage power down detecting and X capacitance detecting and discharge circuit (9); And
Chip lower margin (GND), described chip lower margin (GND) ground connection.
2. reverse exciting switching voltage regulator circuit as claimed in claim 1, wherein,
Described flyback switching circuit (2) is being connected in series of flyback transformer, switching tube, primary current sampling resistor, described power supply circuits (6) are connected with auxiliary group of winding of described flyback transformer, described drive circuit (8) is connected with the grid of described switching tube, and described the second resistance (Rocp) is connected with unearthed one end of described primary current sampling resistor.
3. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
In the time that described switching tube is connected, the output of described feedback sampling circuit (4) is imported into described output feedback pin (FB), the current sampling signal of described flyback switching circuit (2) flow into described current sample pin (CS) via described the second resistance (Rocp), and described control chip (U1) is exported drive pulse signal based on above-mentioned two sampled signals by described driving pin (GATE).
4. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
Have when described flyback switching circuit (2) switching tube cut-off time; described control chip (U1) flows out electric current from described current sample pin (CS); this outflow electric current is at the upper voltage that produces of described the second resistance (Rocp); for overcurrent protection compensation, the resistance value of described the second resistance (Rocp) is adjustable.
5. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
In the time of described switching tube cut-off, described control chip (U1) detects concussion voltage via described drive circuit (8) from described flyback switching circuit (2), to calculate the demagnetization time in inside based on this concussion voltage.
6. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
Described thermal-shutdown circuit (OTP) is the tandem compound of diode and negative temperature coefficient resister (NTC); the anode of diode is connected with described system protection pin (PRT), and described system protection pin (PRT) is ground connection via described thermal-shutdown circuit (OTP).
7. reverse exciting switching voltage regulator circuit as claimed in claim 6, wherein,
Described thermal-shutdown circuit (OTP) also has the 3rd resistance, and described the 3rd resistance is connected in series at cathode side and described diode, the described negative temperature coefficient resister (NTC) of described diode.
8. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
Also have overshoot absorbing circuit (7), described overshoot absorbing circuit (7) is connected to the two ends of the former limit winding of described flyback transformer.
9. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein,
One end of described the first resistance (Rovp) is connected to described system protection pin (PRT); the other end is connected to the auxiliary winding of described flyback transformer and the tie point of described power supply circuits (6); described system protection pin (PRT) detects the output voltage signal being obtained by the electric current of ramp metering chip (U1) by described the first resistance (Rovp); to carry out overvoltage protection, shutdown system in the time that overvoltage occurs in output.
10. reverse exciting switching voltage regulator circuit as claimed in claim 6, wherein,
In the time that described switching tube turn-offs; described system protection pin (PRT) is connected to the tie point of described the first resistance (Rovp) and described thermal-shutdown circuit (OTP); described the first resistance (Rovp), described diode, described negative temperature coefficient resister (NTC) are connected successively; detect the resonance information of information of voltage, demagnetization information and the transformer primary side winding of auxiliary group of winding by the signal of described system protection pin, the detecting of demagnetizing.
CN201420272532.6U 2014-05-26 2014-05-26 A kind of reverse exciting switching voltage regulator circuit CN204030996U (en)

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CN201420272532.6U CN204030996U (en) 2014-05-26 2014-05-26 A kind of reverse exciting switching voltage regulator circuit
TW103212376U TWM488805U (en) 2014-05-26 2014-07-11 Reverse-exciting switch power supply circuit with low cost and multiple protection function

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CN106686831A (en) * 2017-02-24 2017-05-17 上海晶丰明源半导体股份有限公司 Output open circuit protection circuit and silicon controlled dimming LED drive system and method
CN106899198B (en) * 2017-03-30 2019-04-09 北京精密机电控制设备研究所 A kind of feedback winding multiplex circuit of high frequency transformer
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