CN202395661U

CN202395661U - Switching stabilized-voltage power supply device based on full-bridge inversion technology

Info

Publication number: CN202395661U
Application number: CN2012200257680U
Authority: CN
Inventors: 姜艳秋; 赵岩; 梁燕华
Original assignee: Heilongjiang University of Science and Technology
Current assignee: Heilongjiang University of Science and Technology
Priority date: 2012-01-19
Filing date: 2012-01-19
Publication date: 2012-08-22
Anticipated expiration: 2022-01-19

Abstract

The utility model relates to a switching stabilized-voltage power supply device based on a full-bridge inversion technology, in particular to a switching stabilized-voltage power supply device, and aims to solve the problem that the conventional switching stabilized-voltage power supply has large ripples, low conversion efficiency and unstable output voltage. The switching stabilized-voltage power supply device comprises a rectification and filter circuit, a full-bridge inverter circuit, a high-frequency transformer rectification and filter circuit, a feedback circuit, a control circuit and a driving circuit, wherein an output end of the rectification and filter circuit is connected to a rectification and filter input end of the full-bridge inverter circuit; an output end of the full-bridge inverter circuit is connected to an input end of the high-frequency transformer rectification and filter circuit; an output end of the high-frequency transformer rectification and filter circuit is an output end of the switching stabilized-voltage power supply; a feedback output end of the high-frequency transformer rectification and filter circuit is connected with an input end of the feedback circuit; an output end of the feedback circuit is connected to a feedback input end of the control circuit; an output end of the control circuit is connected to an input end of the driving circuit; and an output end of the driving circuit is connected to a driving input end of the full-bridge converter circuit. The switching stabilized-voltage power supply device is suitable for the field of switching stabilized-voltage power supplies.

Description

Switching power supply device based on the full-bridge inverting technology

Technical field

The utility model relates to the switching power supply device.

Background technology

The quality of Switching Power Supply performance to the using electricity system influence greatly if Switching Power Supply job insecurity or unprotect function can cause using electricity system to break down, even is damaged power consumption equipment.

The switching power supply output ripple reaches 150mV at present, and output ripple is big; Simultaneously, conversion efficiency is merely 80%, and conversion efficiency is lower, and voltage regulation is 5%, and load regulation is 1%, and output voltage is unstable.

The utility model content

The purpose of the utility model is to have in order to solve present switching power supply that ripple is big, conversion efficiency is low, the output voltage problem of unstable, and a kind of switching power supply device based on the full-bridge inverting technology is provided.

Switching power supply device based on the full-bridge inverting technology; It comprises current rectifying and wave filtering circuit, full bridge inverter, high frequency transformation current rectifying and wave filtering circuit, feedback circuit, drive circuit and control circuit; The input of current rectifying and wave filtering circuit is the AC signal input of said switching power supply device; Be used to connect the 220V AC power; The signal output part of current rectifying and wave filtering circuit is connected the signal input part of full bridge inverter; The signal output part of full bridge inverter is connected the signal input part of high frequency transformation current rectifying and wave filtering circuit; The signal output part of high frequency transformation current rectifying and wave filtering circuit is the voltage regulation signal output of switching power supply device, and the voltage regulation signal output of high frequency transformation current rectifying and wave filtering circuit is connected the signal input part of feedback circuit, and the signal output part of feedback circuit is connected the feedback input end of control circuit; The control output end of control circuit is connected the signal input end of drive circuit, and the drive signal output of drive circuit is connected the driving signal input of full bridge inverter.

The utility model has been realized real-time feedback, adjustment, the stable output of circuit through feedback circuit, full bridge inverter, high frequency transformation current rectifying and wave filtering circuit and control circuit, and voltage output range is 0～24V; Output ripple is less than 50mV, prior art on year-on-year basis, and the utility model has reduced more than 3 times; Conversion efficiency is greater than 90%, prior art on year-on-year basis, and the utility model conversion efficiency has improved more than 10%; Voltage regulation is less than 2%, and load regulation is less than 0.5%, output voltage stabilization.

Description of drawings

Fig. 1 is the sketch map of the theory diagram of the utility model, and Fig. 2 is a kind of circuit theory diagrams of the utility model.

Embodiment

Embodiment one: combine Fig. 1 that this execution mode is described; The said switching power supply device of this execution mode based on the full-bridge inverting technology; It comprises current rectifying and wave filtering circuit 1, full bridge inverter 2, high frequency transformation current rectifying and wave filtering circuit 3, feedback circuit 4, drive circuit 5 and control circuit 6; The input of current rectifying and wave filtering circuit 1 is the AC signal input of said switching power supply device; Be used to connect the 220V AC power; The signal output part of current rectifying and wave filtering circuit 1 is connected the signal input part of full bridge inverter 2, and the signal output part of full bridge inverter 2 is connected the signal input part of high frequency transformation current rectifying and wave filtering circuit 3, and the signal output part of high frequency transformation current rectifying and wave filtering circuit 3 is the voltage regulation signal output of switching power supply device; The voltage regulation signal output of high frequency transformation current rectifying and wave filtering circuit 3 is connected the signal input part of feedback circuit 4; The signal output part of feedback circuit 4 is connected the feedback input end of control circuit 6, and the control output end of control circuit 6 is connected the signal input end of drive circuit 5, and the drive signal output of drive circuit 5 is connected the driving signal input of full bridge inverter 2.

The scope of the direct voltage of the utility model output is 0～24V; Conversion efficiency is greater than 90%; Output ripple is less than 50mV; Voltage regulation is less than 2%; Load regulation is less than 0.5%.

Embodiment two: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one said further qualification based on the current rectifying and wave filtering circuit 1 in the switching power supply device of full-bridge inverting technology; Said current rectifying and wave filtering circuit 1 is made up of transformer T1, rectifier bridge 1-1 and No. five capacitor C 5; The two ends of the primary coil of a transformer T1 are the AC signal inputs of said switching power supply device; Be used to connect the 220V AC power; The two ends of the secondary coil of a transformer T1 are connected to two AC signal inputs of rectifier bridge 1-1, and No. five capacitor C 5 is connected in parallel between two direct current signal outputs of said rectifier bridge 1-1.

Rectifier bridge 1-1 in this execution mode is composed in series by four diodes.

Embodiment three: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one or two said further qualifications based on the high frequency transformation current rectifying and wave filtering circuit 3 in the switching power supply device of full-bridge inverting technology; Said high frequency transformation current rectifying and wave filtering circuit 3 is made up of No. three transformer T3, No. nine diode VD9, No. ten diode VD10, an inductance coil L1, No. eight capacitor C 8 and 20 No. three resistance R 23; Two outputs of full bridge inverter 2 are connected to the two ends of the primary coil of No. three transformer T3; One end of the secondary coil of No. three transformer T3 connects the anode of No. nine diode VD9; The negative electrode of said No. nine diode VD9 connects the end of an inductance coil L1 and the negative electrode of No. ten diode VD10 simultaneously; The anode of said No. ten diode VD10 connects the other end of the secondary coil of No. three transformer T3; The other end of an inductance coil L1 connects an end of No. eight capacitor C 8 and an end of 20 No. three resistance R 23 simultaneously; The other end of a said inductance coil L1 is a signal output part of high frequency transformation current rectifying and wave filtering circuit 3; The centre tap of the secondary coil of No. three transformer T3 connects the other end of No. eight capacitor C 8 and the other end of 20 No. three resistance R 23 simultaneously, and the centre tap of the secondary coil of said No. three transformer T3 is another signal output part of high frequency transformation current rectifying and wave filtering circuit 3.

Embodiment four: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one, two or three said further qualifications based on the feedback circuit 4 in the switching power supply device of full-bridge inverting technology; Said feedback circuit 4 is made up of resistance R 1, No. two resistance R 2, No. three resistance R 3, voltage stabilizing didoe V1, No. two voltage stabilizing didoe VS2, No. two adjustable resistance RP2 and photoisolator PC2; One end of No. two resistance R 2 connects the end of No. two adjustable resistance RP2 and an end of a resistance R 1 simultaneously as a signal input part of feedback circuit 4; The other end of No. two resistance R 2 connects the negative electrode of No. two voltage stabilizing didoe VS2; The adjustable end that the other end of No. two adjustable resistance RP2 connects an end of No. three resistance R 3, No. two adjustable resistance RP2 simultaneously is connected the control end of a voltage stabilizing didoe V1; The other end of a resistance R 1 connects the input of photoisolator PC2; Another input of photoisolator PC2 connects the negative electrode of a voltage stabilizing didoe V1; The anode of No. two voltage stabilizing didoe VS2 is connected the other end of No. three resistance R 3 and the anode of a voltage stabilizing didoe V1 simultaneously as another signal input part of feedback circuit 4, and the collector output of photoisolator PC2 and emitter output are two feedback signal outputs of feedback circuit 4.

Embodiment five: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one, two, three or four said further qualifications based on the control circuit 6 in the switching power supply device of full-bridge inverting technology; Said control circuit 6 is made up of control chip UC3875, No. four resistance R 4, No. five resistance R 5, No. six 6, No. 7 resistance R of resistance R 7, No. eight resistance R 8, No. nine resistance R 9, No. ten resistance R 10, No. three adjustable resistance RP3, No. nine capacitor C 9, No. ten capacitor C 10,15, ten No. six capacitor C 16 of 14, ten No. five capacitor C of 13, ten No. four capacitor C of 12, ten No. three capacitor C of 11, ten No. two capacitor C of ride on Bus No. 11 capacitor C and ten No. seven capacitor C 17; + 15V power supply connects an end of ten No. three capacitor C 13 and an end of ten No. four capacitor C 14 simultaneously; The other end of ten No. three capacitor C 13 connects control chip UC3875 the 11st pin; The other end of ten No. four capacitor C 14 connects the 10th pin of control chip UC3875; The 12nd pin of control chip UC3875 is connected with 20 pins+15V power supply ground; The collector output of photoisolator PC2 is through the 18th pin of No. four resistance R 4 connection control chip UC3875; The 1st pin of control chip UC3875 is+the 5V reference voltage input; Said the 1st pin connects an end of No. six resistance R 6 and an end of No. nine capacitor C 9 simultaneously; The other end of said No. six resistance R 6 connects the 4th pin of control chip UC3875 and an end of No. five resistance R 5 simultaneously; The other end of No. nine capacitor C 9 is connected with the other end of No. five resistance R 5+15V power supply ground simultaneously; The emitter output of photoisolator PC2 is connected the end of No. three adjustable resistance RP3; The adjustable end of said No. three adjustable resistance RP3 connects the 3rd pin of control chip UC3875 and an end of No. ten capacitor C 10 simultaneously; The other end of No. ten capacitor C 10 is connected the 2nd pin of control chip UC3875 through No. 7 resistance R 7; The other end of No. three adjustable resistance RP3 connects an end of ride on Bus No. 11 capacitor C 11, an end of ten No. two capacitor C 12 connects+15V power supply ground simultaneously; The other end of ride on Bus No. 11 capacitor C 11 is connected the 19th pin of control chip UC3875, and the other end of ten No. two capacitor C 12 is connected the 6th pin of control chip UC3875, and the 7th pin of control chip UC3875 connects an end of No. eight resistance R 8 and an end of ten No. five capacitor C 15 simultaneously; The 15th pin of control chip UC3875 connects an end of No. nine resistance R 9 and an end of ten No. six capacitor C 16 simultaneously; The 16th pin of control chip UC3875 connects an end of No. ten resistance R 10 and an end of ten No. seven capacitor C 17 simultaneously, and the other end of the other end of the other end of No. eight resistance R 8, ten No. five capacitor C 15, the other end of No. nine resistance R 9, the other end of ten No. six capacitor C 16, No. ten resistance R 10 and the other end of ten No. seven capacitor C 17 are connected+15V power supply ground simultaneously, and the 14th pin of control chip UC3875, the 13rd pin, the 9th pin and the 8th pin are four control signal output ends of control circuit 6.

Embodiment six: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one, two, three, four or five said further qualifications based on the drive circuit 5 in the switching power supply device of full-bridge inverting technology; Said drive circuit 5 is made up of 19, two No. ten resistance R of 18, ten No. nine resistance R of 17, ten No. eight resistance R of 16, ten No. seven resistance R of 15, ten No. six resistance R of 14, ten No. five resistance R of 13, ten No. four resistance R of 12, ten No. three resistance R of 11, ten No. two resistance R of ride on Bus No. 11 resistance R 20,28,20 No. nine resistance R of 27,20 No. eight resistance R of 26,20 No. seven resistance R of 25,20 No. six resistance R of 24,20 No. five resistance R of 22,20 No. four resistance R of 21,20 No. two resistance R of two ride on Bus No. 11 resistance R 29, No. six capacitor C 6, No. seven capacitor C 7, No. four transformer T4, No. five transformer T5, No. five triode VT5, No. six triode VT6, No. seven triode VT7, No. eight triode VT8, No. nine triode VT9, No. ten triode VT10, ride on Bus No. 11 triode VT11, ten No. two triode VT12, ride on Bus No. 11 diode VD11, ten No. two diode VD12, ten No. three diode VD13, ten No. four diode VD14, ten No. five diode VD15, ten No. six diode VD16, ten No. seven diode VD17 and ten No. eight diode VD18; The 14th pin of control chip UC3875 connects an end of ride on Bus No. 11 resistance R 11 and an end of ten No. two resistance R 12 simultaneously; The other end of ride on Bus No. 11 resistance R 11 is connected the base stage of No. five triode VT5; The other end of ten No. two resistance R 12 is connected the base stage of No. nine triode VT9; + 15V power supply connects the collector electrode of No. five triode VT5 and the negative electrode of ride on Bus No. 11 diode VD11 simultaneously; The emitter of No. five triode VT5 connects the negative electrode of the emitter of No. nine triode VT9, the anode of diode VD11, ten No. two diode VD12 and an end of No. six capacitor C 6 simultaneously, and the collector electrode of No. nine triode VT9 is connected with the anode of ten No. two diode VD12+15V power supply ground;

The 13rd pin of control chip UC3875 connects an end of ten No. three resistance R 13 and an end of ten No. four resistance R 14 simultaneously; The other end of ten No. three resistance R 13 is connected the base stage of No. six triode VT6; The other end of ten No. four resistance R 14 is connected the base stage of No. ten triode VT10; + 15V power supply connects the collector electrode of No. six triode VT6 and the negative electrode of ten No. three diode VD13 simultaneously; The emitter of No. six triode VT6 connects the negative electrode of the emitter of No. ten triode VT10, the anode of diode VD13, ten No. four diode VD14 and an end of 20 No. eight resistance R 28 simultaneously, and the collector electrode of No. ten triode VT10 is connected with the anode of ten No. four diode VD14+15V power supply ground simultaneously;

The other end of No. six capacitor C 6 is connected the end of the same name of the primary coil of No. four transformer T4, and the other end of 20 No. eight resistance R 28 is connected the other end of the primary coil of No. four transformer T4;

The 9th pin of control chip UC3875 connects an end of ten No. five resistance R 15 and an end of ten No. six resistance R 16 simultaneously; The other end of ten No. five resistance R 15 is connected the base stage of No. seven triode VT7; The other end of ten No. six resistance R 16 is connected the base stage of ride on Bus No. 11 triode VT11; + 15V power supply is connected the collector electrode of No. seven triode VT7 and the negative electrode of ten No. five diode VD15 simultaneously; The emitter of No. seven triode VT7 connects the negative electrode of the anode of the emitter of ride on Bus No. 11 triode VT11, ten No. five diode VD15, ten No. six diode VD16 and an end of No. seven capacitor C 7 simultaneously, and the collector electrode of ride on Bus No. 11 triode VT11 is connected with the anode of ten No. six diode VD16+15V power supply ground simultaneously;

The 8th pin of control chip UC3875 connects an end of ten No. seven resistance R 17 and an end of ten No. eight resistance R 18 simultaneously; The other end of ten No. seven resistance R 17 is connected the base stage of No. eight triode VT8; The other end of ten No. eight resistance R 18 is connected the base stage of ten No. two triode VT12; + 15V power supply connects the collector electrode of No. eight triode VT8 and the negative electrode of ten No. seven diode VD17 simultaneously; The emitter of No. eight triode VT8 is connected the negative electrode of the anode of the emitter of ten No. two triode VT12, ten No. seven diode VD17, ten No. eight diode VD18 and an end of 20 No. nine resistance R 29 simultaneously, and the collector electrode of ten No. two triode VT12 is connected with the anode of ten No. eight diode VD18+15V power supply ground simultaneously;

The other end of No. seven capacitor C 7 is connected the end of the same name of the primary coil of No. five transformer T5, and the other end of 20 No. nine resistance R 29 is connected the other end of the primary coil of No. five transformer T5;

Said No. four transformer T4 have two secondary coils, and the end of the same name of a secondary coil connects an end of ten No. nine resistance R 19, and the other end of said secondary coil connects an end of 20 No. four resistance R 24 as first via drive signal S1 output; The other end of said ten No. nine resistance R 19 connects the other end of 20 No. four resistance R 24 as the first via drive signal G1 output of drive circuit 5;

The end of the same name of another secondary coil of said No. four transformer T4 connects an end of 20 No. five resistance R 25 as the second tunnel drive signal S2 output; The other end of said secondary coil connects an end of two No. ten resistance R 20, and the other end of said two No. ten resistance R 20 connects the other end of 20 No. five resistance R 25 as the second tunnel drive signal G2 output of drive circuit 5;

Said No. five transformer T5 have two secondary coils, and the end of the same name of a secondary coil connects an end of two ride on Bus No. 11 resistance R 21, and the other end of said secondary coil connects an end of 20 No. six resistance R 26 as Third Road drive signal S3 output; The other end of said two ride on Bus No. 11 resistance R 21 connects the other end of 20 No. six resistance R 26 as the Third Road drive signal G3 output of drive circuit 5;

The end of the same name of another secondary coil of said No. five transformer T5 connects an end of 20 No. seven resistance R 27 as the four tunnel drive signal S4 output; The other end of said secondary coil connects an end of 20 No. two resistance R 22, and the other end of said 20 No. two resistance R 22 connects the other end of 20 No. seven resistance R 27 as the four tunnel drive signal G4 output of drive circuit 5.

Embodiment seven: this execution mode is described referring to Fig. 2.This execution mode is to execution mode one said further qualification based on the full bridge inverter 2 in the switching power supply device of full-bridge inverting technology; Said full bridge inverter 2 is made up of metal-oxide-semiconductor D1, No. two metal-oxide-semiconductor D2, No. three metal-oxide-semiconductor D3, No. four metal-oxide-semiconductor D4, No. five diode VD5, No. six diode VD6, No. seven diode VD7, No. eight diode VD8, capacitor C 1, No. two capacitor C 2, No. three capacitor C 3 and No. four capacitor C 4; One end of No. five capacitor C 5 is connected with the negative electrode of the drain electrode of an end of the negative electrode of the drain electrode of a metal-oxide-semiconductor D1, No. five diode VD5, a capacitor C 1, No. three metal-oxide-semiconductor D3, No. seven diode VD7 and an end of No. three capacitor C 3 simultaneously; The source electrode of a metal-oxide-semiconductor D1 is connected with the negative electrode of the drain electrode of the other end of the anode of No. five diode VD5, a capacitor C 1, No. two metal-oxide-semiconductor D2, No. six diode VD6 and an end of No. two capacitor C 2 simultaneously, and the source electrode of a said metal-oxide-semiconductor D1 is an output of full bridge inverter 2;

The source electrode of No. three metal-oxide-semiconductor D3 is connected with the negative electrode of the drain electrode of the other end of the anode of No. seven diode VD7, No. three capacitor C 3, No. four metal-oxide-semiconductor D4, No. eight diode VD8 and an end of No. four capacitor C 4 simultaneously, and the source electrode of said No. three metal-oxide-semiconductor D3 is another output of full bridge inverter 2;

The other end of No. five capacitor C 5 is connected with the anode of the source electrode of the other end of the anode of the source electrode of No. three metal-oxide-semiconductor D3, No. six diode VD6, No. two capacitor C 2, No. four metal-oxide-semiconductor D4, No. eight diode VD8 and the other end of No. four capacitor C 4 simultaneously;

The grid of a metal-oxide-semiconductor D1 is connected the first via drive signal output G1 of drive circuit 5 as the first via driving signal input G1 of full bridge inverter 2, and the source electrode of a metal-oxide-semiconductor D1 is connected the first via drive signal output S1 of drive circuit 5 as the first via driving signal input S1 of full bridge inverter 2;

The grid of No. two metal-oxide-semiconductors (D2) is connected the second tunnel drive signal output G2 of drive circuit 5 as the second tunnel driving signal input G2 of full bridge inverter 2, and the source electrode of No. two metal-oxide-semiconductor D2 is connected the second tunnel drive signal output S2 of drive circuit 5 as the second tunnel driving signal input S2 of full bridge inverter 2;

The grid of No. three metal-oxide-semiconductor D3 is connected the Third Road drive signal output G3 of drive circuit 5 as the Third Road driving signal input G3 of full bridge inverter 2, and the source electrode of No. three metal-oxide-semiconductor D3 is connected the Third Road drive signal output S3 of drive circuit 5 as the Third Road driving signal input S3 of full bridge inverter 2;

The grid of No. four metal-oxide-semiconductor D4 is connected the four tunnel drive signal output G4 of drive circuit 5 as the four tunnel driving signal input G4 of full bridge inverter 2, and the source electrode of No. four metal-oxide-semiconductor D4 is connected the four tunnel drive signal output S4 of drive circuit 5 as the four tunnel driving signal input S4 of full bridge inverter 2.

The described technical scheme of the utility model is not limited to the described concrete structure of above-mentioned each execution mode, can also be the reasonable combination of the said technical characterictic of above-mentioned each execution mode.

Claims

1. based on the technological switching power supply device of full-bridge inverting; It is characterized in that it comprises current rectifying and wave filtering circuit (1), full bridge inverter (2), high frequency transformation current rectifying and wave filtering circuit (3), feedback circuit (4), drive circuit (5) and control circuit (6); The input of current rectifying and wave filtering circuit (1) is the AC signal input of said switching power supply device; Be used to connect the 220V AC power; The signal output part of current rectifying and wave filtering circuit (1) is connected the signal input part of full bridge inverter (2); The signal output part of full bridge inverter (2) is connected the signal input part of high frequency transformation current rectifying and wave filtering circuit (3); The signal output part of high frequency transformation current rectifying and wave filtering circuit (3) is the voltage regulation signal output of switching power supply device, and the voltage regulation signal output of high frequency transformation current rectifying and wave filtering circuit (3) is connected the signal input part of feedback circuit (4), and the signal output part of feedback circuit (4) is connected the feedback input end of control circuit (6); The control output end of control circuit (6) is connected the signal input end of drive circuit (5), and the drive signal output of drive circuit (5) is connected the driving signal input of full bridge inverter (2).

2. according to the said switching power supply device of claim 1 based on the full-bridge inverting technology; It is characterized in that current rectifying and wave filtering circuit (1) is made up of a transformer (T1), rectifier bridge (1-1) and No. five electric capacity (C5); The two ends of the primary coil of a transformer (T1) are the AC signal inputs of said switching power supply device; Be used to connect the 220V AC power; The two ends of the secondary coil of a transformer (T1) are connected to two AC signal inputs of rectifier bridge (1-1), and No. five electric capacity (C5) are connected in parallel between two direct current signal outputs of said rectifier bridge (1-1).

3. according to the said switching power supply device of claim 2 based on the full-bridge inverting technology; It is characterized in that high frequency transformation current rectifying and wave filtering circuit (3) is made up of No. three transformers (T3), No. nine diodes (VD9), No. ten diodes (VD10), an inductance coil (L1), No. eight electric capacity (C8) and 20 No. three resistance (R23); Two outputs of full bridge inverter (2) are connected to the two ends of the primary coil of No. three transformers (T3); One end of the secondary coil of No. three transformers (T3) connects the anode of No. nine diodes (VD9); The negative electrode of said No. nine diodes (VD9) connects an end of an inductance coil (L1) and the negative electrode of No. ten diodes (VD10) simultaneously; The anode of said No. ten diodes (VD10) connects the other end of the secondary coil of No. three transformers (T3); The other end of an inductance coil (L1) connects an end of No. eight electric capacity (C8) and an end of 20 No. three resistance (R23) simultaneously; The other end of a said inductance coil (L1) is a signal output part of high frequency transformation current rectifying and wave filtering circuit (3); The centre tap of the secondary coil of No. three transformers (T3) connects the other end of No. eight electric capacity (C8) and the other end of 20 No. three resistance (R23) simultaneously, and the centre tap of the secondary coil of said No. three transformers (T3) is another signal output part of high frequency transformation current rectifying and wave filtering circuit (3).

4. according to the said switching power supply device of claim 3 based on the full-bridge inverting technology; It is characterized in that feedback circuit (4) is made up of a resistance (R1), No. two resistance (R2), No. three resistance (R3), a voltage stabilizing didoe (V1), No. two voltage stabilizing didoes (VS2), No. two adjustable resistances (RP2) and photoisolator (PC2); One end of No. two resistance (R2) connects an end of No. two adjustable resistances (RP2) and an end of a resistance (R1) simultaneously as a signal input part of feedback circuit (4); The other end of No. two resistance (R2) connects the negative electrode of No. two voltage stabilizing didoes (VS2); The other end of No. two adjustable resistances (RP2) connects an end of No. three resistance (R3) simultaneously, the adjustable end of No. two adjustable resistances (RP2) is connected the control end of a voltage stabilizing didoe (V1); The other end of a resistance (R1) connects an input of photoisolator (PC2); Another input of photoisolator (PC2) connects the negative electrode of a voltage stabilizing didoe (V1); The anode of No. two voltage stabilizing didoes (VS2) is connected the other end of No. three resistance (R3) and the anode of a voltage stabilizing didoe (V1) simultaneously as another signal input part of feedback circuit (4), and the collector output of photoisolator (PC2) and emitter output are two feedback signal outputs of feedback circuit (4).

5. according to the said switching power supply device of claim 4 based on the full-bridge inverting technology; It is characterized in that control circuit (6) is made up of control chip UC3875, No. four resistance (R4), No. five resistance (R5), No. six resistance (R6), No. 7 resistance (R7), No. eight resistance (R8), No. nine resistance (R9), No. ten resistance (R10), No. three adjustable resistances (RP3), No. nine electric capacity (C9), No. ten electric capacity (C10), ride on Bus No. 11 electric capacity (C11), ten No. two electric capacity (C12), ten No. three electric capacity (C13), ten No. four electric capacity (C14), ten No. five electric capacity (C15), ten No. six electric capacity (C16) and ten No. seven electric capacity (C17); + 15V power supply connects an end of ten No. three electric capacity (C13) and an end of ten No. four electric capacity (C14) simultaneously; The other end of ten No. three electric capacity (C13) connects control chip UC3875 the 11st pin; The other end of ten No. four electric capacity (C14) connects the 10th pin of control chip UC3875; The 12nd pin of control chip UC3875 is connected with 20 pins+15V power supply ground; The collector output of photoisolator (PC2) connects the 18th pin of control chip UC3875 through No. four resistance (R4); The 1st pin of control chip UC3875 is+the 5V reference voltage input; Said the 1st pin connects an end of No. six resistance (R6) and an end of No. nine electric capacity (C9) simultaneously; The other end of said No. six resistance (R6) connects the 4th pin of control chip UC3875 and an end of No. five resistance (R5) simultaneously; The other end of No. nine electric capacity (C9) is connected with the other end of No. five resistance (R5)+15V power supply ground simultaneously; The emitter output of photoisolator (PC2) is connected an end of No. three adjustable resistances (RP3); The adjustable end of said No. three adjustable resistances (RP3) connects the 3rd pin of control chip UC3875 and an end of No. ten electric capacity (C10) simultaneously; The other end of No. ten electric capacity (C10) is connected the 2nd pin of control chip UC3875 through No. 7 resistance (R7); The other end of No. three adjustable resistances (RP3) connects an end of ride on Bus No. 11 electric capacity (C11), an end of ten No. two electric capacity (C12) connects+15V power supply ground simultaneously; The other end of ride on Bus No. 11 electric capacity (C11) is connected the 19th pin of control chip UC3875, and the other end of ten No. two electric capacity (C12) is connected the 6th pin of control chip UC3875, and the 7th pin of control chip UC3875 connects an end of No. eight resistance (R8) and an end of ten No. five electric capacity (C15) simultaneously; The 15th pin of control chip UC3875 connects an end of No. nine resistance (R9) and an end of ten No. six electric capacity (C16) simultaneously; The 16th pin of control chip UC3875 connects an end of No. ten resistance (R10) and an end of ten No. seven electric capacity (C17) simultaneously, and the other end of the other end of the other end of the other end of No. eight resistance (R8), ten No. five electric capacity (C15), the other end of No. nine resistance (R9), ten No. six electric capacity (C16), the other end of No. ten resistance (R10) and ten No. seven electric capacity (C17) is connected+15V power supply ground simultaneously, and the 14th pin of control chip UC3875, the 13rd pin, the 9th pin and the 8th pin are four control signal output ends of control circuit 6.

6. according to the said switching power supply device of claim 5 based on the full-bridge inverting technology; It is characterized in that drive circuit (5) is made up of ride on Bus No. 11 resistance (R11), ten No. two resistance (R12), ten No. three resistance (R13), ten No. four resistance (R14), ten No. five resistance (R15), ten No. six resistance (R16), ten No. seven resistance (R17), ten No. eight resistance (R18), ten No. nine resistance (R19), two No. ten resistance (R20), two ride on Bus No. 11 resistance (R21), 20 No. two resistance (R22), 20 No. four resistance (R24), 20 No. five resistance (R25), 20 No. six resistance (R26), 20 No. seven resistance (R27), 20 No. eight resistance (R28), 20 No. nine resistance (R29), No. six electric capacity (C6), No. seven electric capacity (C7), No. four transformers (T4), No. five transformers (T5), No. five triodes (VT5), No. six triodes (VT6), No. seven triodes (VT7), No. eight triodes (VT8), No. nine triodes (VT9), No. ten triodes (VT10), ride on Bus No. 11 triode (VT11), ten No. two triodes (VT12), ride on Bus No. 11 diode (VD11), ten No. two diodes (VD12), ten No. three diodes (VD13), ten No. four diodes (VD14), ten No. five diodes (VD15), ten No. six diodes (VD16), ten No. seven diodes (VD17) and ten No. eight diodes (VD18); The 14th pin of control chip UC3875 connects an end of ride on Bus No. 11 resistance (R11) and an end of ten No. two resistance (R12) simultaneously; The other end of ride on Bus No. 11 resistance (R11) is connected the base stage of No. five triodes (VT5); The other end of ten No. two resistance (R12) is connected the base stage of No. nine triodes (VT9); + 15V power supply connects the collector electrode of No. five triodes (VT5) and the negative electrode of ride on Bus No. 11 diode (VD11) simultaneously; The emitter of No. five triodes (VT5) connects the emitter of No. nine triodes (VT9), the anode of diode (VD11), the negative electrode of ten No. two diodes (VD12) and an end of No. six electric capacity (C6) simultaneously, and the collector electrode of No. nine triodes (VT9) is connected with the anode of ten No. two diodes (VD12)+15V power supply ground;

The 13rd pin of control chip UC3875 connects an end of ten No. three resistance (R13) and an end of ten No. four resistance (R14) simultaneously; The other end of ten No. three resistance (R13) is connected the base stage of No. six triodes (VT6); The other end of ten No. four resistance (R14) is connected the base stage of No. ten triodes (VT10); + 15V power supply connects the collector electrode of No. six triodes (VT6) and the negative electrode of ten No. three diodes (VD13) simultaneously; The emitter of No. six triodes (VT6) connects the emitter of No. ten triodes (VT10), the anode of diode (VD13), the negative electrode of ten No. four diodes (VD14) and an end of 20 No. eight resistance (R28) simultaneously, and the collector electrode of No. ten triodes (VT10) is connected with the anode of ten No. four diodes (VD14)+15V power supply ground simultaneously;

The other end of No. six electric capacity (C6) is connected the end of the same name of the primary coil of No. four transformers (T4), and the other end of 20 No. eight resistance (R28) is connected the other end of the primary coil of No. four transformers (T4);

The 9th pin of control chip UC3875 connects an end of ten No. five resistance (R15) and an end of ten No. six resistance (R16) simultaneously; The other end of ten No. five resistance (R15) is connected the base stage of No. seven triodes (VT7); The other end of ten No. six resistance (R16) is connected the base stage of ride on Bus No. 11 triode (VT11); + 15V power supply is connected the collector electrode of No. seven triodes (VT7) and the negative electrode of ten No. five diodes (VD15) simultaneously; The emitter of No. seven triodes (VT7) connects the emitter of ride on Bus No. 11 triode (VT11), the anode of ten No. five diodes (VD15), the negative electrode of ten No. six diodes (VD16) and an end of No. seven electric capacity (C7) simultaneously, and the collector electrode of ride on Bus No. 11 triode (VT11) is connected with the anode of ten No. six diodes (VD16)+15V power supply ground simultaneously;

The 8th pin of control chip UC3875 connects an end of ten No. seven resistance (R17) and an end of ten No. eight resistance (R18) simultaneously; The other end of ten No. seven resistance (R17) is connected the base stage of No. eight triodes (VT8); The other end of ten No. eight resistance (R18) is connected the base stage of ten No. two triodes (VT12); + 15V power supply connects the collector electrode of No. eight triodes (VT8) and the negative electrode of ten No. seven diodes (VD17) simultaneously; The emitter of No. eight triodes (VT8) is connected the emitter of ten No. two triodes (VT12), the anode of ten No. seven diodes (VD17), the negative electrode of ten No. eight diodes (VD18) and an end of 20 No. nine resistance (R29) simultaneously, and the collector electrode of ten No. two triodes (VT12) is connected with the anode of ten No. eight diodes (VD18)+15V power supply ground simultaneously;

The other end of No. seven electric capacity (C7) is connected the end of the same name of the primary coil of No. five transformers (T5), and the other end of 20 No. nine resistance (R29) is connected the other end of the primary coil of No. five transformers (T5);

Said No. four transformers (T4) have two secondary coils, and the end of the same name of a secondary coil connects an end of ten No. nine resistance (R19), and the other end of said secondary coil connects an end of 20 No. four resistance (R24) as first via drive signal S1 output; The other end of said ten No. nine resistance (R19) connects the other end of 20 No. four resistance (R24) as the first via drive signal G1 output of drive circuit (5);

The end of the same name of another secondary coil of said No. four transformers (T4) connects an end of 20 No. five resistance (R25) as the second tunnel drive signal S2 output; The other end of said secondary coil connects an end of two No. ten resistance (R20), and the other end of said two No. ten resistance (R20) connects the other end of 20 No. five resistance (R25) as the second tunnel drive signal G2 output of drive circuit (5);

Said No. five transformers (T5) have two secondary coils, and the end of the same name of a secondary coil connects an end of two ride on Bus No. 11 resistance (R21), and the other end of said secondary coil connects an end of 20 No. six resistance (R26) as Third Road drive signal S3 output; The other end of said two ride on Bus No. 11 resistance (R21) connects the other end of 20 No. six resistance (R26) as the Third Road drive signal G3 output of drive circuit (5);

The end of the same name of another secondary coil of said No. five transformers (T5) connects an end of 20 No. seven resistance (R27) as the four tunnel drive signal S4 output; The other end of said secondary coil connects an end of 20 No. two resistance (R22), and the other end of said 20 No. two resistance (R22) connects the other end of 20 No. seven resistance (R27) as the four tunnel drive signal G4 output of drive circuit (5).

7. according to the said switching power supply device of claim 6 based on the full-bridge inverting technology; It is characterized in that full bridge inverter (2) is made up of a metal-oxide-semiconductor (D1), No. two metal-oxide-semiconductors (D2), No. three metal-oxide-semiconductors (D3), No. four metal-oxide-semiconductors (D4), No. five diodes (VD5), No. six diodes (VD6), No. seven diodes (VD7), No. eight diodes (VD8), an electric capacity (C1), No. two electric capacity (C2), No. three electric capacity (C3) and No. four electric capacity (C4); One end of No. five electric capacity (C5) is connected with the drain electrode of a metal-oxide-semiconductor (D1), the negative electrode of No. five diodes (VD5), an end of an electric capacity (C1), the drain electrode of No. three metal-oxide-semiconductors (D3), the negative electrode of No. seven diodes (VD7) and an end of No. three electric capacity (C3) simultaneously; The source electrode of a metal-oxide-semiconductor (D1) is connected with the anode of No. five diodes (VD5), the other end of an electric capacity (C1), the drain electrode of No. two metal-oxide-semiconductors (D2), the negative electrode of No. six diodes (VD6) and an end of No. two electric capacity (C2) simultaneously, and the source electrode of a said metal-oxide-semiconductor (D1) is an output of full bridge inverter (2);

The source electrode of No. three metal-oxide-semiconductors (D3) is connected with the anode of No. seven diodes (VD7), the other end of No. three electric capacity (C3), the drain electrode of No. four metal-oxide-semiconductors (D4), the negative electrode of No. eight diodes (VD8) and an end of No. four electric capacity (C4) simultaneously, and the source electrode of said No. three metal-oxide-semiconductors (D3) is another output of full bridge inverter (2);

The other end of No. five electric capacity (C5) is connected with the source electrode of No. three metal-oxide-semiconductors (D3), the anode of No. six diodes (VD6), the other end of No. two electric capacity (C2), the source electrode of No. four metal-oxide-semiconductors (D4), the anode of No. eight diodes (VD8) and the other end of No. four electric capacity (C4) simultaneously;

The grid of a metal-oxide-semiconductor (D1) is connected the first via drive signal output G1 of drive circuit (5) as the first via driving signal input G1 of full bridge inverter (2), and the source electrode of a metal-oxide-semiconductor (D1) is connected the first via drive signal output S1 of drive circuit (5) as the first via driving signal input S1 of full bridge inverter (2);

The grid of No. two metal-oxide-semiconductors (D2) is connected the second tunnel drive signal output G2 of drive circuit (5) as the second tunnel driving signal input G2 of full bridge inverter (2), and the source electrode of No. two metal-oxide-semiconductors (D2) is connected the second tunnel drive signal output S2 of drive circuit (5) as the second tunnel driving signal input S2 of full bridge inverter (2);

The grid of No. three metal-oxide-semiconductors (D3) is connected the Third Road drive signal output G3 of drive circuit (5) as the Third Road driving signal input G3 of full bridge inverter (2), and the source electrode of No. three metal-oxide-semiconductors (D3) is connected the Third Road drive signal output S3 of drive circuit (5) as the Third Road driving signal input S3 of full bridge inverter (2);

The grid of No. four metal-oxide-semiconductors (D4) is connected the four tunnel drive signal output G4 of drive circuit (5) as the four tunnel driving signal input G4 of full bridge inverter (2), and the source electrode of No. four metal-oxide-semiconductors (D4) is connected the four tunnel drive signal output S4 of drive circuit (5) as the four tunnel driving signal input S4 of full bridge inverter (2).