CN2269672Y

CN2269672Y - High voltage high frequency high power chopper

Info

Publication number: CN2269672Y
Application number: CN 96213867
Authority: CN
Inventors: 原怀西; 王成桥; 王利勇; 曲明玉
Original assignee: NO 15 INST NO 1 RESEARCH I CHI
Current assignee: NO 15 INST NO 1 RESEARCH I CHI
Priority date: 1996-06-25
Filing date: 1996-06-25
Publication date: 1997-12-03
Anticipated expiration: 2006-06-25

Abstract

The utility model relates to a high voltage, high frequency and high power chopper used for the voltage regulation for a dc power supply. The utility model is composed of an input peak suppressing circuit, a chopping switch circuit, an output filter, a pulse width modulating and driving circuit, and a protective circuit. The utility model is characterized in that the chopping switch circuit is formed by connecting two or more than two insulated gate bipolar transistors (IGBT) in series. The utility model has the advantages of high service voltage, high chopping frequency, large output power, small size, high efficiency, no noise and operational reliability. The utility model is suitable for a stationary type subway auxiliary power supply.

Description

The high voltagehigh frequency high-power chopper

The utility model relates to the chopper that a kind of DC power supply pressure regulation is used, particularly a kind of high voltagehigh frequency high-power chopper.

Existing high-power chopper is made up of input filter circuit, chopping switch, pulse-width modulation circuit, drive circuit, output filter and protective circuit etc., and wherein chopping switch is made of turn-off thyristor (GTO) or single igbt (IGBT).Though it is big that employing GTO makes the withstand voltage height of chopper, the power of chopping switch, its chopping frequency is low, generally is no more than 2MHz, make the output filter volume and weight after the copped wave increase like this, noise is big, and closed-loop adjustment speed is slow, and control circuit of chopping complexity, efficient are low; Single IGBT is fast as the chopper switching speed of chopping switch, chopping frequency is high though adopt, and that it is withstand voltage is low, power is little, does not satisfy the needs of high-power.

The purpose of this utility model is to overcome the deficiency of above-mentioned chopper, and a kind of chopping frequency height, operating voltage height, efficient height, big, the noiseless of power and the high voltagehigh frequency high-power chopper of reliable operation are provided.

The purpose of this utility model reaches by following measure: it by the input spike suppress circuit, copped wave main switch circuit, output filter, PWM pulse-width modulation and drive circuit, protective circuit is formed, its characteristics are: the chopping switch circuit by on two or plural insulated gate bipolar transistor (IGBT) be composed in series successively.The input high voltage of chopper suppresses to enter the chopping switch circuit of being made up of two or more IGBT behind the circuit through the input spike, by the high-power square-wave voltage of its output high voltagehigh frequency, through the needed smooth dc voltage of output after the output filter filtering; Draw two paths of signals from the output filter output, one the tunnel enters PWM pulse-width modulation and drive circuit, make that each IGBT is under high frequency situations in positive and negative square-wave signal control chopping switch circuit of its output variable-width, turn-on and turn-off play the negative feedback regulating action simultaneously; Another road signal is controlled PWM through protective circuit, makes copped wave output under overcurrent and overpressure situation, is effectively protected, and protective circuit also monitors the input of chopping switch simultaneously, and chopper also is protected under the under-voltage and overpressure situation in input

In order to guarantee that the voltage that the chopping switch circuit is born at each IGBT of moment of stable state and high frequency switching equates, between the source electrode of each IGBT and drain electrode, all be connected to all and press, absorb circuit.

The utility model compared with prior art has following advantage:

1. the utility model is owing to adopt a plurality of IGBT series connection, and therefore, operating voltage height, chopping frequency height, power are big, and volume is little, and ripple is little, noiseless, and the efficient height, the output ripple voltage is little, and governing speed is fast.

2. all press, absorb circuit and fast protection circuit owing to adopting, therefore, whole chopper functional reliability height.

Below in conjunction with accompanying drawing and enforcement side the utility model is further described.

Fig. 1 is a theory diagram of the present utility model;

Fig. 2, Fig. 3 are electrical schematic diagram of the present utility model.

Referring to accompanying drawing 1; 2; 3; the utility model suppresses circuit 1 by the input spike; chopping switch circuit 2; output filter 3; PWM pulse-width modulation and drive circuit 4; protective circuit 5 is formed; whole chopper adopts PID to regulate; wherein import spike and suppress circuit 1 by XL1; C1; C2; V1 forms; it is on the copped wave main switch circuit 2 formed of K1-K3 that its output is received by three IGBT; between the source electrode of K1-K3 and drain electrode all and be connected to all to press and absorb circuit; all press and absorb circuit by static voltage sharing R2; R4; R6; and transient peak absorbs circuit R1; R3; R5; V2; V3; V4; C4; C5; C6 forms; the source electrode of K3 is received by XL2; C7; the input of the output filter 3 that C3 forms; pulse width modulator and drive circuit 4 are by pulse width modulating chip IC14 and peripheral circuit; three special driving chip IC11-IC13 and peripheral circuit are formed; the output of three chip for driving IC11-IC14 meets the grid D1-D3 of K1-K3 respectively, and protective circuit 5 is by input voltage sensor LV1; output voltage sensor LV2; output current transducer LA1; voltage comparator ic 1; IC2; retainer IC3; IC4; inverter ic 7; IC8; relay S1; S2; with door IC9; compositions such as electronic switch IC10.

Pulse width modulating chip IC 14 of the present utility model is according to the size of the output voltage that is recorded by output voltage sensor LV2, the square-wave signal of output distinct pulse widths, drive special driving chip IC11-IC13 and export positive and negative square-wave signal, the duty ratio of control K1-K3 conducting and shutoff makes output voltage stabilization.All pressing of steady operation and K1-K3 conducting and shutdown moment by all pressing the absorption circuit to guarantee.

When input voltage just often, the sampled signal of LV1 through IC1 relatively, comparative result keeps through IC3, IC4, and is anti-phase through IC7, IC8 again, makes the coil of relay S1, S2 be low level, its normally-closed contact closure, IC14 work, thus chopper is also worked.When input was under-voltage, the sampled signal of LV1 compared through IC1, and the result keeps through IC3, IC4, after IC7, IC8 are anti-phase, making relay S1 is high level, and S2 is a low level, the S1 adhesive, and S2 is failure to actuate, because the normally-closed contact of S1 and S2 makes the IC14 dead electricity for series connection, chopper quits work.When the input overvoltage, making relay S1 is low level, and S2 is a high level, and S1 is failure to actuate, the S2 adhesive, and chopper quits work; When output voltage, electric current just often, LA1, LV2 sampled signal through IC2 relatively after, the equal output low level of IC5, IC6, electronic switch IC10 disconnects, IC14 operate as normal, chopper work.When output overvoltage, the LV2 sampled signal through IC2 relatively after, IC6 exports high level, electronic switch closes, IC14 the 4th pin is a high level, so IC14 stops to send out a pulse, chopper is quit work.When output overcurrent, the LA1 sampled signal through IC2 relatively after, IC5 exports high level, electronic switch IC10 closure, IC14 the 4th pin is a high level, stops to send pulse, chopper quits work.Behind output overcurrent, the overvoltage protection, rework, press reset key S3, the non-end of R of IC5, IC6 is set to low level, electronic switch IC10 disconnects, and the 4th pin of IC14 is a low level, chopper work.

Claims

1. high voltagehigh frequency high-power chopper that the DC power supply pressure regulation is used; be made up of input spike inhibition circuit, chopping switch circuit, output filter, PWM pulse-width modulation and drive circuit, protective circuit, it is characterized in that: the chopping switch circuit is composed in series by two or more insulated gate bipolar transistors (IGBT).

2. chopper according to claim 1 is characterized in that: all be connected to all to press between the source electrode of each IGBT and drain electrode and absorb circuit.

3. chopper according to claim 2 is characterized in that: each all presses the absorption circuit to be made up of the static state voltage equipoise absorption resistance and the RCD transient peak absorption circuit that are attempted by between IGBT grid, the drain electrode.

4. chopper according to claim 1; it is characterized in that: protective circuit is a fast protection circuit; it is by input voltage sensor; output voltage sensor; the output current transducer; retainer; two relay compositions that the contact is connected in series mutually; the output of input voltage sensor is successively through voltage comparator; retainer; link to each other with the relay that two contacts are connected in series mutually; the output of second relay connects pulse width modulator and drive circuit, and the output of output voltage sensor and output current transducer is respectively successively through voltage comparator; retainer; and electronic switch is also received on the pulse width modulator.

5. chopper according to claim 1 is characterized in that: the input spike suppresses circuit by the LC filter, form with the fast diode and the high frequency capacitance of inductance L reverse parallel connection.

6. chopper according to claim 1 is characterized in that: pulse width modulator adopts the TL494 chip, and drive circuit adopts fast driving chip M57958L.