CN203289341U - Flyback switch power supply circuit - Google Patents
Flyback switch power supply circuit Download PDFInfo
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- CN203289341U CN203289341U CN2013200072208U CN201320007220U CN203289341U CN 203289341 U CN203289341 U CN 203289341U CN 2013200072208 U CN2013200072208 U CN 2013200072208U CN 201320007220 U CN201320007220 U CN 201320007220U CN 203289341 U CN203289341 U CN 203289341U
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Abstract
本实用新型涉及一种反激开关电源电路。该反激开关电源电路包括：整流和电磁干扰滤波电路，在输入端处接收交流输入信号，对该交流输入信号进行整流和电磁干扰滤波，并在输出端处输出通过整流和电磁干扰滤波得到的信号；反激开关电路，该反激开关电路接收整流和电磁干扰滤波电路的输出信号，并且根据控制信号对该输出信号进行变压以输出变压后的信号；输出滤波电路，接收所述变压后的信号并对其执行整流和滤波以输出用于驱动负载的直流输出信号；反馈取样电路，对所述直流输出信号的电压进行采样以生成输出反馈信号；以及控制电路，根据所述输出反馈信号生成用于控制反激开关电路的所述控制信号。
The utility model relates to a flyback switching power supply circuit. The flyback switching power supply circuit includes: a rectification and electromagnetic interference filter circuit, which receives an AC input signal at the input end, performs rectification and electromagnetic interference filtering on the AC input signal, and outputs the rectified and electromagnetic interference filtering circuit at the output end. signal; a flyback switch circuit, the flyback switch circuit receives the output signal of the rectification and electromagnetic interference filter circuit, and transforms the output signal according to the control signal to output the transformed signal; the output filter circuit receives the transformed The compressed signal is rectified and filtered to output a DC output signal for driving a load; a feedback sampling circuit samples the voltage of the DC output signal to generate an output feedback signal; and a control circuit based on the output The feedback signal generates said control signal for controlling the flyback switching circuit.
Description
Technical field
The utility model technology relates to a kind of anti-switching power circuit that swashs structure, possesses the characteristics such as stand-by power consumption is low, efficiency is high, start-up time is short, the EMI radiation is low, and can meet various safety standards.
Background technology
Current era, human society face the pressure that energy resource consumption is excessive, environmental disruption is serious, and energy-saving and emission-reduction are extremely urgent.Electric equipment and electronic product, in order to reduce energy resource consumption, must be optimized its power supply changeover device, thereby realize higher conversion efficiency and lower static stand-by power consumption., in the middle low power field, instead swash structure and generally adopted because of with low cost, simplicity of design.On the market at the inverse-excitation type switch power-supply that uses, also there is further improved space in the technical indicators such as its conversion efficiency, stand-by power consumption at present., along with various new standard of energy, the appearance of safety standard, will higher specification requirement be proposed to existing power supply changeover device.
The utility model content
Made the utility model in order to address the above problem.The purpose of this utility model is to overcome present technical bottleneck, provides that a kind of conversion efficiency is high, stand-by power consumption is low, start-up time is short and lower-cost inverse.
According to an embodiment of the present utility model, a kind of reverse exciting switching voltage regulator circuit is provided, comprise: rectification and electromagnetic interference filter circuit, receive ac input signal at input end, this ac input signal is carried out rectification and EMI Filtering, and at output, export the signal that obtains by rectification and EMI Filtering; Anti-energizing switch circuit, this anti-energizing switch circuit receives the output signal of described rectification and electromagnetic interference filter circuit, and according to control signal, this output signal is carried out the signal of transformation after with the output transformation; Output filter circuit, receive the signal after described transformation and it carried out rectification and filtering is used for driving the direct-flow output signal of load with output; The feedback sample circuit, sample to generate output feedback signal to the voltage of described direct-flow output signal; And control circuit, generate the described control signal that is used for controlling described anti-energizing switch circuit according to described output feedback signal.
Solved aforementioned technical problem according to reverse exciting switching voltage regulator circuit of the present utility model, and had that conversion efficiency is high, stand-by power consumption is low, start-up time is short and the advantage such as cost is lower.
Description of drawings
From below in conjunction with accompanying drawing to understanding better the utility model the description of embodiment of the present utility model, wherein:
Fig. 1 shows the structure according to the reverse exciting switching voltage regulator circuit of an embodiment;
Fig. 2 shows the structure according to the reverse exciting switching voltage regulator circuit of another embodiment;
Fig. 3 shows the connection example of thermal-shutdown circuit;
Fig. 4 shows the structure according to the reverse exciting switching voltage regulator circuit of another embodiment;
Fig. 5 shows the structure according to the reverse exciting switching voltage regulator circuit of another embodiment;
Fig. 6 shows the connection example of overshoot absorbing circuit;
Fig. 7 shows the connection example of drive circuit; And
Fig. 8 shows the connection example of power supply circuits.
Embodiment
Below will describe feature and the exemplary embodiment of the utility model various aspects in detail.Following description has provided many details, in order to provide complete understanding of the present utility model.Yet, it will be apparent to one skilled in the art that the utility model can in the situation that some details in not needing these details implement.To the description of embodiment, be below only in order by example of the present utility model is shown, to provide the clearer understanding of the utility model.The utility model never is limited to the following any concrete configuration that proposes, but has contained any modification, replacement and the improvement of coherent element or parts under the prerequisite that does not break away from spirit of the present utility model.
Circuit of the present utility model is based on the inverse-excitation type switch power-supply circuit exploitation.As shown in Figure 1, reverse exciting switching voltage regulator circuit of the present utility model comprises that AC(exchanges) input rectifying and EMI(electromagnetic interference) filter circuit 1, anti-energizing switch circuit 2, output filter circuit 3, feedback sample circuit 4, control circuit 5, power supply circuits 6, overshoot absorbing circuit 7, drive circuit 8 and output overvoltage testing circuit 9.
Rectification and EMI filter circuit 1 receive ac input signal at its input end, and this ac input signal is carried out rectification and EMI filtering, and at its output, export the signal that obtains by rectification and EMI Filtering.This ac input signal is for example common 220V AC signal, can certainly be other AC signal.When this ac input signal transmitted by live wire (L) and zero line (N claims again the neutral line), two inputs of rectification and EMI filter circuit 1 were connected respectively to L and N.
As shown in Figure 1, rectification and EMI filter circuit 1 comprise fuse FUSE, two-stage common mode filtering inductance, X capacitor C X, piezo-resistance MOV, rectifier bridge BD and output filter capacitor C1(the first electric capacity).For example defined in IEC60384-14, X electric capacity is to be connected on the input line two ends to be used for eliminating the electric capacity of differential mode interference.Two-stage common mode filtering inductance is for example to comprise the first order common mode filtering inductance of the first inductance L 1 and the second inductance L 2 and comprise the 3rd inductance L 3 and the second level common mode filtering inductance of the 4th inductance L 4.In the present embodiment, rectifier bridge BD consists of four diodes.
Particularly, the first end of fuse FUSE is connected to the first input end of rectification and EMI filter circuit 1, and the second end of fuse FUSE is connected to the first end of the first inductance L 1; The second end of the first inductance L 1 is connected to the first end (E point) of piezo-resistance MOV, X capacitor C X and the 3rd inductance L 3; The first end of the second inductance L 2 is connected to the second input of rectification and EMI filter circuit 1, and the second end of the second inductance L 2 is connected to the first end (F point) of piezo-resistance MOV, X capacitor C X and the 4th inductance L 4; The negative pole of the first diode in rectifier bridge BD and the positive pole of the second diode are connected to the second end of the 3rd inductance L 3, the negative pole of the second diode and the 3rd diode is connected to the first end of output filter capacitor C1, the negative pole of the positive pole of the 3rd diode and the 4th diode is connected to the second end of the 4th inductance L 4, and the positive pole of the first diode and the 4th diode is connected to the second end of output filter capacitor C1; And the first end of output filter capacitor C1 is connected to the output of rectification and EMI filter circuit 1, and the second end of output filter capacitor C1 is connected to ground.
In addition, rectification and EMI filter circuit 1 can also comprise the first resistance R 1 and the second resistance R 2 that is connected in series between E point and F point.Particularly, the first end of the first resistance R 1 is connected to the E point, and the second end of the first resistance R 1 is connected to the first end of the second resistance R 2, and the second end of the second resistance R 2 is connected to the F point.
Particularly, the first end of armature winding Np (B) is connected to the first end of power switch Q1, and the second end of armature winding Np (A point) is connected to the output of rectification and EMI filter circuit 1; The first end of secondary winding Ns is connected to the first input end of output filter circuit, i.e. the positive pole of the first diode D1, and the second end of secondary winding Ns is connected to the second input of filtering output circuit 3 (being connected in the present embodiment ground); The first end of auxiliary winding Na is connected to the input (H point) of power supply circuits, and the second end of auxiliary winding Na is connected to ground; The second end of power switch Q1 is connected to the first end of primary current sample resistance R7, and the control end of power switch Q1 is connected to the output (D point) of drive circuit 8; The second end of primary current sample resistance R7 is connected to ground.
Power switch Q1 is for example mos field effect transistor (MOSFET), and in the case, the first end of power switch Q1, the second end and control end are respectively drain electrode, source electrode and the grids of MOSFET.Can certainly adopt other power switch, for example diode or other switch that can turn on and off according to control signal.Power switch Q1 turns on and off according to the driving signal from drive circuit, makes and exists in power switch or do not have primary current, regulates thus the output of flyback transformer T.
Particularly, the positive pole of rectifier diode D1 is connected to the first end of secondary winding Ns and the first end of resistance R 10, the second end of resistance R 10 is connected to the first end of capacitor C 5, the second end of the negative pole of rectifier diode D1 and capacitor C 5 is connected to first output of the first end of filter capacitor C4 as output filter circuit 3, and the second end of filter capacitor C4 and the second end of secondary winding Ns link together as the second output of output filter circuit 3.The second output of output filter circuit 3 for example is connected to power supply ground.Two kinds of earth terminals have been shown in the circuit of Fig. 1, with the inverted triangle symbolic representation be for example with reference to ground, and what represent with three short-terms is power supply ground.These two kinds of earth terminals can be in different current potentials, as shown in feedback sample circuit 4 belows, can connect electric capacity between the two.In this article, unless explicit state, otherwise term " " be used in reference to for " with reference to ground ".
The voltage of the direct-flow output signal of 4 pairs of output filter circuits of feedback sample circuit, 3 outputs samples to generate output feedback signal, and the output feedback signal that will generate offers control circuit 5.Feedback circuit 4 adds that by three-terminal voltage-stabilizing a reference source (for example TL431) and optocoupler (being optical coupler) OC feedback resistance electric capacity forms, it is sampled to output voltage, by the TL431 loop adjustment, feed back in former limit control chip U1, thus the duty ratio of by-pass cock MOSFET.
As shown in Figure 1, feedback sample circuit 4 comprises three-terminal voltage-stabilizing a reference source, optocoupler OC, resistance R 11-R14 and capacitor C 6.Optocoupler OC comprises luminous tube D and photosensitive tube Q, and luminous tube D is for example light-emitting diode or any other luminous tube, and photosensitive tube Q is for example phototriode or any other photosensitive tube.in circuit shown in Figure 1, the first end of resistance R 11 and R14 is connected to the first output of output filter circuit 3, the second end of resistance R 11 is connected to the first end of resistance R 12 and R13 and the benchmark utmost point of three-terminal voltage-stabilizing a reference source, the second end of resistance R 12 is connected to power supply ground, the second end of resistance R 14 is connected to the first input end (for example positive pole of luminous tube) of optocoupler OC, the second end of resistance R 13 is connected to the first end of capacitor C 6, the second end of capacitor C 6 is connected to the negative pole of three-terminal voltage-stabilizing a reference source and the second input of optocoupler OC (for example negative pole of luminous tube), the positive pole of three-terminal voltage-stabilizing a reference source is connected to power supply ground, the first output of optocoupler OC (for example collector of photosensitive tube) is connected to the output feedback pin FB of the control chip in control circuit 5, the second output of optocoupler OC (for example emitter of photosensitive tube) is connected to ground.The output feedback signal that feedback sample circuit 4 generates outputs to control circuit 5 by the first output, i.e. output feedback pin FB.
A: grid drives pin GATE, and output is used for the control signal that turns on and off of power ratio control switch, and it is connected to the input (C point) of drive circuit 8;
B: output feedback pin FB, be used for receiving output feedback signal, be connected with the first output of optocoupler OC;
C: system protection pin RT, be used for system overheat protector or outer protection, it is connected to the first end of overheat protector (OTP) circuit, and the second end of OTP circuit is connected to ground;
D: power supply input pin VDD, be used for chip power supply, it is connected to output (G point) and resistance R 3 second ends of power supply circuits 6, and the first end of resistance R 3 is connected to the second end of resistance R 1 and the first end of resistance R 2;
E: current sample pin CS, be used for the voltage signal of sampling transformer primary side electric current on sample resistance, it is connected to the first end of resistance R 6 and the first end of capacitor C 3, and the second end of resistance R 6 is connected to the second end of power switch Q1, and the second end of capacitor C 3 is connected to ground;
F: output over-voltage protection pin Demag, receive the overvoltage protection signal, (auxiliary winding Na) obtains output voltage information for the demagnetization platform on the winding (secondary winding Ns) of powering by sampling, and when output overvoltage occurs, protect, it is connected to the second end of resistance R 8 and the first end of resistance R 9;
G: chip lower margin GND, the reference ground of chip, it is connected to ground; With
H: input undervoltage protection pin BO; be used for carrying out input voltage under-voltage protection; it is connected to the second end of resistance R 4, the first end of resistance R 5 and the first end of capacitor C 2, and the first end of resistance R 4 is connected to the second end of L4, and the second end of resistance R 5 and capacitor C 2 is connected to ground.
BO is input undervoltage protection pin, and by resistance R 4, R5 dividing potential drop detecting AC-input voltage, when low voltage, the input undervoltage protection can occur chip, stops driver output.Same BO also can detect the voltage on input electrochemical capacitor (C1) after the rectifier bridge rectification; as shown in Figure 2, the BO pin is connected to the first end of output filter capacitor C1 via R4, and this method of attachment can be detected input voltage equally; when under-voltage protection occurs, stop driver output.Note, for clear, omitted in Fig. 2 with Fig. 1 in identical label, these labels can obtain with reference to figure 1, Fig. 4 of back and Fig. 5 are also like this.
FB is output feedback pin, and the feedback signal of optocoupler is by in this pin input chip.CS is the current sample pin, and current sampling signal is by flowing into the CS pin after RC filtering.The signal that is received by FB and CS pin produces PWM output by the chip internal computing, is used for anti-energizing switch circuit 2 is carried out PWM.Demag is that output voltage detects pin, and by detecting the signal of output overvoltage testing circuit 9, if overpressure situation occurs in output, reporting system is closed.RT is the system protection pin, and by overheat protector (OTP) circuit detecting system temperature, when system temperature was too high, the input overheat protector occurred the notice chip, stops driver output.
The OTP circuit can comprise the series connection of negative temperature coefficient resister NTC and conventional, electric-resistance (that is, positive temperature coefficient resistor) R, and R and NTC can switches, and R also can save.Fig. 3 shows the connection example of OTP circuit, can certainly adopt other connection.
System protection pin RT can be multiplexed with and carry out overheat protector (OTP) and these the two kinds of protections of power supply overvoltage protection (VDD OVP), as shown in Figure 4 and Figure 5.In Fig. 4 or Fig. 5; control circuit 5 also comprises capacitor C 6, triode Q2, voltage stabilizing didoe D2 and resistance R 15; in the case; system protection pin RT is also connected to the collector of triode Q2; the base stage of triode Q2 is connected to the first end of capacitor C 6 and the positive pole of voltage stabilizing didoe D2; the second end of the emitter of triode Q2 and capacitor C 6 is connected to ground, and the negative pole of voltage stabilizing didoe D2 is connected to the first end of resistance R 15, and the second end of resistance R 15 is connected to power supply input pin VDD(G point).
Overshoot absorbing circuit 7 is connected between 2 of A, B in circuit, drive circuit 8 is connected to the C(grid and drives pin GATE in circuit), between 2 of D, power supply circuits 6 are connected to G(power supply input pin VDD in circuit), between 2 of H, respectively can be as shown in Figure 1, Figure 2, Fig. 4 or mode shown in Figure 5 connect, and, according to different system requirements, can change.
The first end of overshoot absorbing circuit 7 is connected with the second end (A point) of armature winding Np, and the second end of overshoot absorbing circuit 7 is connected with the first end (B point) of armature winding Np.Overshoot absorbing circuit 7 (that is, between its first end and the second end) between 2 of A, B can have multiple connection, and Fig. 6 shows seven kinds of connection examples, can certainly adopt other connection.Fig. 6 leftmost side shows the symbolic representation of Transient Suppression Diode (TVS), connection shown in Figure 6 like this comprises following several (order of ordering to B from the A point, i.e. order from the first end of overshoot absorbing circuit 7 to the second end): (1) is in parallel with electric capacity and resistance, then the series opposing diode; (2) series connection of forward TVS and backward diode; (3) with forward TVS, resistance and Capacitance parallel connection, series opposing diode then; (4) with forward TVS and resistance parallel connection, then series opposing diode; (5) with forward TVS and Capacitance parallel connection, series opposing diode then; (6) with resistance and Capacitance parallel connection, then series resistance and backward diode; And (7) with resistance and Capacitance parallel connection, then series opposing diode and resistance.
The input of power supply circuits 6 (H point) is connected to the first end of auxiliary winding Na, and the output of power supply circuits 6 (G point) is connected to for electrical input VDD.Between 2 of G, the H of power supply circuits 6 in circuit, multiple connection can be arranged, for example shown in Figure 8 comprise following several: the positive pole of (1) diode is connected to the H point, the negative pole of diode is connected to the first end of resistance and filter capacitor (for example electrochemical capacitor), the second end of resistance and the first end of another electric capacity are connected to the G point, and the second end of filter capacitor and another electric capacity is connected to ground; (2) first end of resistance is connected to the H point, and the positive pole of diode is connected to the second end of resistance, and the negative pole of diode and the first end of filter capacitor are connected to the G point, and the second end of filter capacitor is connected to ground; (3) positive pole of diode is connected to the H point, and the negative pole of diode and the first end of filter capacitor are connected to the G point, and the negative pole of filter capacitor is connected to ground; And the positive pole of (4) diode is connected to the H point, and the negative pole of diode is connected to the first end of resistance, and the second end of resistance and the first end of filter capacitor are connected to the G point, and the second end of filter capacitor is connected to ground.
Output voltage detecting circuit (9) comprises two divider resistance R8 and R9, chip is carried out dividing potential drop after signal enter the Demag pin.Particularly, the first end of resistance R 8 is connected to the input of power supply circuits 6, and the second end of resistance R 8 and the first end of resistance R 9 are connected to output over-voltage protection pin Demag, and the second end of resistance R 9 is connected to ground.
Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art will be appreciated that, can carry out various modifications, combination and change to these specific embodiments, and can not break away 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 symbol in accompanying drawing should be considered to, rather than restrictive, unless concrete indication is separately arranged.For example, each benchmark ground can be in same potential, perhaps adopts as the case may be different potentials.After having read the utility model, the substitutions and modifications to circuit structure that those skilled in the art recognize include in scope of the present utility model.
Claims (13)
1. reverse exciting switching voltage regulator circuit comprises:
Rectification and electromagnetic interference filter circuit, receive ac input signal at input end, and this ac input signal is carried out rectification and EMI Filtering, and at output, export the signal that obtains by rectification and EMI Filtering;
Anti-energizing switch circuit, this anti-energizing switch circuit receives the output signal of described rectification and electromagnetic interference filter circuit, and according to control signal, this output signal is carried out the signal of transformation after with the output transformation;
Output filter circuit, receive the signal after described transformation and it carried out rectification and filtering is used for driving the direct-flow output signal of load with output;
The feedback sample circuit, sample to generate output feedback signal to the voltage of described direct-flow output signal; And
Control circuit, generate the described control signal that is used for controlling described anti-energizing switch circuit according to described output feedback signal.
2. reverse exciting switching voltage regulator circuit as claimed in claim 1, wherein, described anti-energizing switch circuit comprises flyback transformer, power switch and primary current sample resistance, wherein said flyback transformer comprises armature winding, secondary winding and auxiliary winding, the first end of described armature winding is connected to the first end of described power switch, the second end of described armature winding is connected to the output of described rectification and electromagnetic interference filter circuit, the second end of described power switch is connected to the first end of described primary current sample resistance, the second end of described primary current sample resistance is connected to ground.
3. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein, described power switch is mos field effect transistor, and the first end of described power switch, the second end and control end are respectively drain electrode, source electrode and the grid of described mos field effect transistor.
4. reverse exciting switching voltage regulator circuit as claimed in claim 2, also comprise the overshoot absorbing circuit, the first end of this overshoot absorbing circuit is connected with the second end of described armature winding and its second end is connected with the first end of described armature winding, and described overshoot absorbing circuit comprises one of following connection between its first end and the second end: (1) is in parallel with electric capacity and resistance, then the series opposing diode; (2) series connection of forward TVS and backward diode; (3) with forward TVS, resistance and Capacitance parallel connection, series opposing diode then; (4) with forward TVS and resistance parallel connection, then series opposing diode; (5) with forward TVS and Capacitance parallel connection, series opposing diode then; (6) with resistance and Capacitance parallel connection, then series resistance and backward diode; And (7) with resistance and Capacitance parallel connection, then series opposing diode and resistance, and wherein TVS represents Transient Suppression Diode.
5. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein, described output filter circuit comprises output rectifier diode and filter capacitor, the positive pole of described output rectifier diode is connected to the first end of described secondary winding, the negative pole of described output rectifier diode is connected to first output of the first end of described filter capacitor as described output filter circuit, and the second end of described filter capacitor and the second end of secondary winding link together as the second output of described output filter circuit.
6. reverse exciting switching voltage regulator circuit as claimed in claim 2, wherein, described rectification and electromagnetic interference filter circuit comprise fuse, the first order and second level common mode filtering inductance, X electric capacity, piezo-resistance, rectifier bridge, output filter capacitor and the first resistance and the second resistance, described first order common mode filtering inductance comprises that the first inductance and the second inductance and second level common mode filtering inductance comprise the 3rd inductance and the 4th inductance, described rectifier bridge consists of four diodes, and
the first end of described fuse is connected to the first input end of described rectification and electromagnetic interference filter circuit, the second end of described fuse is connected to the first end of described the first inductance, the second end of described the first inductance is connected to described piezo-resistance, the first end of X electric capacity and the 3rd inductance, the first end of described the second inductance is connected to the second input of described rectification and electromagnetic interference filter circuit, the second end of described the second inductance is connected to described piezo-resistance, the first end of X electric capacity and the 4th inductance, the negative pole of the first diode in described rectifier bridge and the positive pole of the second diode are connected to the second end of described the 3rd inductance, the negative pole of the second diode and the 3rd diode is connected to the first end of described output filter capacitor, the negative pole of the positive pole of the 3rd diode and the 4th diode is connected to the second end of described the 4th inductance, the positive pole of the first diode and the 4th diode is connected to the second end of described output filter capacitor, the first end of described output filter capacitor is connected to the output of described rectification and electromagnetic interference filter circuit, the second end of described output filter capacitor is connected to ground, the first end of described the first resistance is connected to the first end of described piezo-resistance, the second end of described the first resistance is connected to the first end of described the second resistance, and the second end of described the second resistance is connected to the second end of described piezo-resistance.
7. reverse exciting switching voltage regulator circuit as claimed in claim 1, wherein, described feedback sample circuit comprises three-terminal voltage-stabilizing a reference source, optocoupler, the 11 to the 14 resistance and the 6th electric capacity, the first end of described the 11 resistance and the 14 resistance is connected to the first output of described output filter circuit, the second end of described the 11 resistance is connected to the first end of the 12 resistance and the 13 resistance and the benchmark utmost point of described three-terminal voltage-stabilizing a reference source, the second end of described the 12 resistance is connected to power supply ground, the second end of described the 14 resistance is connected to the first input end of described optocoupler, the second end of described the 13 resistance is connected to the first end of described the 6th electric capacity, the second end of described the 6th electric capacity is connected to the negative pole of described three-terminal voltage-stabilizing a reference source and the second input of described optocoupler, the positive pole of described three-terminal voltage-stabilizing a reference source is connected to power supply ground, the first output of described optocoupler is to the described output feedback signal of described control circuit output, the second output of described optocoupler is connected to ground.
8. reverse exciting switching voltage regulator circuit as claimed in claim 6; wherein; described control circuit comprises pulse width modulation controlled chip, the 3rd to the 6th resistance, the second and the 3rd electric capacity and thermal-shutdown circuit, and described pulse width modulation controlled chip comprises following eight pin:
(A) grid drives pin, and its output is used for controlling the described control signal that turns on and off of described power switch;
(B) output feedback pin, it receives described output feedback signal;
(C) system protection pin, it is connected to the first end of described thermal-shutdown circuit, and the second end of described thermal-shutdown circuit is connected to ground;
(D) power supply input pin, it is used for chip power supply, and is connected to the second end of described the 3rd resistance, and the first end of described the 3rd resistance is connected to the second end of described the first resistance;
(E) current sample pin, it is connected to the first end of the 6th resistance and the first end of the 3rd electric capacity, and the second end of described the 6th resistance is connected to the second end of described power switch, and the second end of described the 3rd electric capacity is connected to ground;
(F) output over-voltage protection pin, it is used for receiving the overvoltage protection signal;
(G) chip lower margin, it is connected to ground; With
(H) input undervoltage protection pin; it is connected to the second end of the 4th resistance, the first end of the 5th resistance and the first end of the second electric capacity; the first end of described the 4th resistance is connected to the second end of described the 4th inductance or the first end of described output filter capacitor, and the second end of described the 5th resistance and the second electric capacity is connected to ground.
9. reverse exciting switching voltage regulator circuit as claimed in claim 8, wherein, described thermal-shutdown circuit comprises negative temperature coefficient resister and the conventional, electric-resistance that is connected in series, and perhaps only comprises negative temperature coefficient resister.
10. reverse exciting switching voltage regulator circuit as claimed in claim 8, wherein, described control circuit also comprises the 6th electric capacity, triode, voltage stabilizing didoe and the 15 resistance, described system protection pin is also connected to the collector of described triode, the base stage of described triode is connected to the first end of described the 6th electric capacity and the positive pole of described voltage stabilizing didoe, the second end of the emitter of described triode and described the 6th electric capacity is connected to ground, the negative pole of described voltage stabilizing didoe is connected to the first end of described the 15 resistance, the second end of described the 15 resistance is connected to described power supply input pin.
11. reverse exciting switching voltage regulator circuit as claimed in claim 8, also comprise drive circuit, this drive circuit receives described control signal, and generate the driving signal that is used for driving described power switch according to described control signal, wherein the input of this drive circuit is connected to described grid and drives pin, and the output of this drive circuit is connected to the control end of described power switch, and described drive circuit comprises one of following connection in turn between its input and output: the resistance that (1) is independent; (2), with backward diode and resistance series connection, then both going up a resistance in parallel; (3), with resistance and backward diode series connection, then both going up a resistance in parallel; And (4) are in parallel with backward diode and resistance.
12. reverse exciting switching voltage regulator circuit as claimed in claim 8, also comprise power supply circuits, the input of these power supply circuits is connected to the first end of described auxiliary winding, and its output is connected to described for electrical input, described power supply circuits comprise one of following connection between its input and output: the positive pole of (1) diode is connected to input, the negative pole of this diode is connected to the first end of resistance and filter capacitor, the second end of this resistance and the first end of another electric capacity are connected to output, and the second end of this filter capacitor and another electric capacity is connected to ground; (2) first end of resistance is connected to input, and the positive pole of diode is connected to the second end of this resistance, and the negative pole of this diode and the first end of filter capacitor are connected to output, and the second end of this filter capacitor is connected to ground; (3) positive pole of diode is connected to input, and the negative pole of this diode and the first end of filter capacitor are connected to output, and the negative pole of this filter capacitor is connected to ground; And the positive pole of (4) diode is connected to input, and the negative pole of this diode is connected to the first end of resistance, and the second end of this resistance and the first end of filter capacitor are connected to output, and the second end of this filter capacitor is connected to ground.
13. reverse exciting switching voltage regulator circuit as claimed in claim 12; also comprise the output overvoltage testing circuit; this output overvoltage testing circuit comprises the 8th resistance and the 9th resistance; the first end of described the 8th resistance is connected to the input of described power supply circuits and the first end of described auxiliary winding; the second end of described the 8th resistance and the first end of described the 9th resistance are connected to described output over-voltage protection pin, and the second end of described the 9th resistance is connected to ground.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200072208U CN203289341U (en) | 2013-01-07 | 2013-01-07 | Flyback switch power supply circuit |
| TW102207002U TWM463003U (en) | 2013-01-07 | 2013-04-17 | Flyback switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200072208U CN203289341U (en) | 2013-01-07 | 2013-01-07 | Flyback switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203289341U true CN203289341U (en) | 2013-11-13 |
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ID=49545683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200072208U Expired - Lifetime CN203289341U (en) | 2013-01-07 | 2013-01-07 | Flyback switch power supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203289341U (en) |
| TW (1) | TWM463003U (en) |
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| CN104092383A (en) * | 2014-07-01 | 2014-10-08 | 浙江海得新能源有限公司 | High-voltage input auxiliary power supply circuit and working method thereof |
| CN104167780A (en) * | 2014-07-30 | 2014-11-26 | 广州益维电动汽车有限公司 | Continuous controllable isolating type active driving equalizing charging module and charging system with same |
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| CN105406721A (en) * | 2015-12-18 | 2016-03-16 | 深圳市赢新光电发展有限公司 | Input under-voltage protection circuit and switching power supply |
| CN106208748A (en) * | 2016-09-05 | 2016-12-07 | 深圳市艾特智能科技有限公司 | Switching power circuit |
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| CN109039089A (en) * | 2018-08-21 | 2018-12-18 | 珠海瑞捷电气股份有限公司 | The isolating switch power of super wide voltage input |
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| CN109560537A (en) * | 2017-09-27 | 2019-04-02 | 深圳光峰科技股份有限公司 | A kind of optocoupler overvoltage crowbar and associated appliance |
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-
2013
- 2013-01-07 CN CN2013200072208U patent/CN203289341U/en not_active Expired - Lifetime
- 2013-04-17 TW TW102207002U patent/TWM463003U/en not_active IP Right Cessation
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| CN112834810A (en) * | 2021-01-04 | 2021-05-25 | 基合半导体（宁波）有限公司 | Commercial power voltage detection circuit and detection method applied to flyback isolation power supply |
| CN114244177A (en) * | 2021-12-20 | 2022-03-25 | 黑龙江雨谷科技有限公司 | High-voltage pulse switch power supply |
| CN115037161A (en) * | 2022-07-01 | 2022-09-09 | 广东开利暖通空调股份有限公司 | Switching power supply protection circuit and power supply system |
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|---|---|
| TWM463003U (en) | 2013-10-01 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20131113 |