CN202713131U

CN202713131U - IPM (intelligent power module) isolation interlock drive circuit

Info

Publication number: CN202713131U
Application number: CN 201220386448
Authority: CN
Inventors: 李旭; 沈鸿
Original assignee: SHENZHEN ENCOM ELECTRIC TECHNOLOGIES Co Ltd
Priority date: 2012-08-06
Filing date: 2012-08-06
Publication date: 2013-01-30
Anticipated expiration: 2022-08-06

Abstract

The utility model discloses an IPM (intelligent power module) isolation interlock drive circuit. The circuit comprises three two-bridge-arm drive circuits of the same structure, and each two-bridge-arm drive circuit comprises an upper bridge drive circuit (10), a lower bridge drive circuit (11) and an interlock circuit (12). According to the utility model, a low-speed optical coupler is used for realizing the isolation transmission of the signals, a speed-up capacitor is used for improving the transmission speed of the circuit, a voltage-stabilizer tube is used for improving the anti-interference performance of the circuit, and double diodes are used for realizing the interlock of the upper bridge and the lower bridge. Thus, compared with the conventional IPM isolation drive circuit, the IPM isolation interlock drive circuit provided by the utility model has low cost, good anti-interference performance and high reliability.

Description

A kind of IPM isolation interlocking drive circuit

Technical field

The utility model relates to Intelligent Power Module (Intelligent Power Module, IPM) driving field, relates in particular to a kind of IPM isolation interlocking drive circuit.

Background technology

Along with the progress of power inverting switching technique with and the raising of integrated degree drive the IPM device that is protected in one and more and more be widely used in the occasion that frequency converter and household electrical appliances etc. need inversion so that carry.Generally, IPM drives signal with pulse-width modulation (Pulse Width Modulation, PWM) signal at a high speed as it, the drive end of IPM and forceful electric power output are altogether, because the obvious interference between the strong and weak electricity signal, can cause IPM up and down bridge the risk of opening is simultaneously arranged, have hidden danger.In the prior art, usually adopt optocoupler to realize the safety isolation of strong and weak electricity among the IPM.Because it is higher to drive the frequency of signal, so, need to adopt high speed photo coupling just can meet the demands, and the price of high speed photo coupling is very high, and the up and down bridge that can't avoid interference or device because of signal unusually to cause is open-minded simultaneously, affect equally the reliability of product.Therefore, existing IPM isolated drive circuit not only cost is high, and poor reliability.

The utility model content

The technical problems to be solved in the utility model is, provides that a kind of cost is low, the IPM of good reliability isolation interlocking drive circuit.

A kind of IPM isolation interlocking drive circuit, it includes two identical brachium pontis drive circuits of three line structures, every road two brachium pontis drive circuits include bridge drive circuit on, should include the first optocoupler by upper bridge drive circuit, the one RC circuit, the first voltage-stabiliser tube and PNP pipe, the anodic bonding of luminous tube has a front end power supply in the first optocoupler, its negative electrode is connected with one first current-limiting resistance, the other end of this first current-limiting resistance is upper bridge pwm signal input, the grounded emitter of photosensitive tube in the first optocoupler, its collector electrode is connected to the anode of the first voltage-stabiliser tube by a RC circuit, the negative electrode of the first voltage-stabiliser tube links to each other with the base stage of a PNP pipe and the tie point of the two also is connected to a rear end power supply by one first pull-up resistor, the emitter of the one PNP pipe is connected to the rear end power supply, its current collection is very gone up bridge pwm signal output and is passed through one first resistance to earth (R4) ground connection, described the first optocoupler is the low speed optocoupler, a described RC circuit includes the second current-limiting resistance and is parallel to the first speed-up capacitor of the second current-limiting resistance, and this first speed-up capacitor is used for accelerating the ON/OFF speed of a PNP pipe; Bridge drive circuit once, it includes the second optocoupler, the 2nd RC circuit, the second voltage-stabiliser tube and the 2nd PNP pipe, the anodic bonding front end power supply of luminous tube in described the second optocoupler, its negative electrode is connected with one the 3rd current-limiting resistance, the other end of the 3rd current-limiting resistance is lower bridge pwm signal input, the grounded emitter of photosensitive tube in the second optocoupler, its collector electrode is connected to the anode of the second voltage-stabiliser tube by the 2nd RC circuit, the negative electrode of the second voltage-stabiliser tube links to each other with the base stage of the 2nd PNP pipe and the tie point of the two also is connected to the rear end power supply by one second pull-up resistor, the emitter of the 2nd PNP pipe is connected to the rear end power supply, its current collection very descends bridge pwm signal output and passes through one second resistance to earth ground connection, described the second optocoupler is the low speed optocoupler, described the 2nd RC circuit includes the 4th current-limiting resistance and is parallel to the second speed-up capacitor of the 4th current-limiting resistance, and this second speed-up capacitor is used for accelerating the ON/OFF speed of the 2nd PNP pipe; One interlock circuit, it includes the first diode and the second diode, the anode of this first diode connects bridge pwm signal output, negative electrode connects the anode of the second voltage-stabiliser tube, it is used for the high level signal of the upper bridge pwm signal output of feedback and vises the second voltage-stabiliser tube as clamp voltage, to make the 2nd PNP pipe be off state, the anode of this second diode connects lower bridge pwm signal output, negative electrode connects the anode of the first voltage-stabiliser tube, it is used for the high level signal of the lower bridge driving of feedback signal output part and vises the first voltage-stabiliser tube as clamp voltage, is off state to make the 2nd PNP pipe.

In the disclosed a kind of IPM isolation interlocking drive circuit of the utility model, utilize cheap low speed optocoupler to realize the isolation transmission of signal, utilize speed-up capacitor to improve the transmission rate of circuit, utilize voltage-stabiliser tube to improve the antijamming capability of circuit, realize the up and down interlocking of bridge with double diode again.Therefore, the utility model is compared existing IPM isolated drive circuit, and not only with low cost but also antijamming capability is strong, good reliability.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

For a more detailed description to the utility model below in conjunction with drawings and Examples.

The disclosed a kind of IPM isolation interlocking drive circuit of the utility model, it includes two identical brachium pontis drive circuits of three line structures, and as shown in Figure 1, every road two brachium pontis drive circuits include:

Bridge drive circuit 10 on one, it includes the first optocoupler U1, the one RC circuit 100, the first voltage-stabiliser tube Z1 and PNP pipe T1, the anodic bonding of luminous tube has a front end power supply VCC among the first optocoupler U1, its negative electrode is connected with one first current-limiting resistance R1, the other end of this first current-limiting resistance R1 is upper bridge pwm signal input PWM1 IN, the grounded emitter of photosensitive tube among the first optocoupler U1, its collector electrode is connected to the anode of the first voltage-stabiliser tube Z1 by a RC circuit 100, the negative electrode of the first voltage-stabiliser tube Z1 links to each other with the base stage of PNP pipe T1 and the tie point of the two also is connected to a rear end power vd D by one first pull-up resistor R3, the emitter of the one PNP pipe T1 is connected to rear end power vd D, its current collection is very gone up bridge pwm signal output PWM2 OUT and is passed through one first resistance to earth R4 ground connection, the first optocoupler U1 is the low speed optocoupler, the one RC circuit 100 includes the second current-limiting resistance R2 and is parallel to the first speed-up capacitor C1 of the second current-limiting resistance R2, and this first speed-up capacitor C1 is used for accelerating the ON/OFF speed of PNP pipe T1.

In the upper bridge drive circuit 10, the first optocoupler U1 is low speed optocoupler with low cost, also be connected with a RC circuit 100 with the first speed-up capacitor C1 at the outlet side of optocoupler, this first speed-up capacitor C1 is for the electric charge of the PNP pipe T1 base stage accumulation of releasing, to shorten the saturation time that moves back of PNP pipe T1, improve it and open speed, make bridge drive circuit 10 have good transmission rate.Simultaneously, when the photosensitive tube conducting among the first optocoupler U1, the anode of the first voltage-stabiliser tube Z1 is dragged down, because the reverse breakdown characteristics of the first voltage-stabiliser tube Z1, and both end voltage is just understood conducting after reaching the voltage stabilizing value, so any interference signal in the circuit all because making the first voltage-stabiliser tube Z1 reverse breakdown can not open PNP pipe T1, has improved the antijamming capability of circuit.Therefore, this circuit is not only with low cost but also antijamming capability is strong.

Once the bridge drive circuit 11, it includes the second optocoupler U2, the 2nd RC circuit 110, the second voltage-stabiliser tube Z2 and the 2nd PNP pipe T2, the anodic bonding front end power supply VCC of luminous tube among the second optocoupler U2, its negative electrode is connected with one the 3rd current-limiting resistance R5, the other end of the 3rd current-limiting resistance R5 is lower bridge pwm signal input PWM2 IN, the grounded emitter of photosensitive tube among the second optocoupler U2, its collector electrode is connected to the anode of the second voltage-stabiliser tube Z2 by the 2nd RC circuit 110, the negative electrode of the second voltage-stabiliser tube Z2 links to each other with the base stage of the 2nd PNP pipe T2 and the tie point of the two also is connected to rear end power vd D by one second pull-up resistor R7, the emitter of the 2nd PNP pipe T2 is connected to rear end power vd D, its current collection very descends bridge pwm signal output PWM2 OUT and passes through one second resistance to earth R8 ground connection, the second optocoupler U1 is the low speed optocoupler, the 2nd RC circuit 110 includes the 4th current-limiting resistance R6 and is parallel to the second speed-up capacitor C2 of the 4th current-limiting resistance R6, and this second speed-up capacitor C2 is used for accelerating the ON/OFF speed of the 2nd PNP pipe T2.

Lower bridge drive circuit 11 is identical with upper bridge drive circuit 10 structures, and the second optocoupler U2 adopts low speed optocoupler with low cost equally, utilizes simultaneously the transmission rate of the second speed-up capacitor C2 raising circuit, improves the antijamming capability of circuit with the second voltage-stabiliser tube Z2 again.

One interlock circuit 12, it includes the first diode D1 and the second diode D2, the anode of this first diode D1 connects bridge pwm signal output PWM1 OUT, negative electrode connects the anode of the second voltage-stabiliser tube Z2, it is used for the high level signal of the upper bridge pwm signal output PWM1 OUT of feedback and vises the second voltage-stabiliser tube Z2 as clamp voltage, is off state to make the 2nd PNP pipe T2.The anode of this second diode D2 meets lower bridge pwm signal output PWM2 OUT, negative electrode connects the anode of the first voltage-stabiliser tube Z1, be used for the lower bridge of feedback and drive the high level signal of signal output part and vise the first voltage-stabiliser tube Z1 as clamp voltage, be off state to make the 2nd PNP pipe T2.

In the interlock circuit 12, when upper bridge pwm signal output PWM1 OUT output high level, the first diode D1 conducting, the anode of the second voltage-stabiliser tube Z2 is high level state, because the negative electrode of the first voltage-stabiliser tube Z2 is connected to rear end power vd D by pull-up resistor R7, the second voltage-stabiliser tube Z2 is ended, at this moment because its two ends are high level state, the 2nd PNP pipe T2 turn-offs, and makes lower bridge pwm signal output PWM2OUT lock in low level state.Similarly, during instantly bridge pwm signal output output high level, also can upper bridge pwm signal output PWM1 OUT be locked in low level state by the second diode D2.Therefore, interlock circuit 12 has been realized upper

bridge drive circuit

10 and 11 interlockings of lower bridge drive circuit have been improved the reliability of two brachium pontis drive circuits.

The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.

Claims

1. an IPM isolation interlocks drive circuit, and it includes two identical brachium pontis drive circuits of three line structures, it is characterized in that, every road two brachium pontis drive circuits include:

Bridge drive circuit (10) on one, it includes the first optocoupler (U1), the one RC circuit (100), the first voltage-stabiliser tube (Z1) and PNP pipe (T1), the anodic bonding of luminous tube has a front end power supply (VCC) in the first optocoupler (U1), its negative electrode is connected with one first current-limiting resistance (R1), the other end of this first current-limiting resistance (R1) is upper bridge pwm signal input (PWM1 IN), the grounded emitter of photosensitive tube in the first optocoupler (U1), its collector electrode is connected to the anode of the first voltage-stabiliser tube (Z1) by a RC circuit (100), the base stage that the negative electrode of the first voltage-stabiliser tube (Z1) and a PNP manage (T1) links to each other and the tie point of the two also is connected to a rear end power supply (VDD) by one first pull-up resistor (R3), the emitter of the one PNP pipe (T1) is connected to rear end power supply (VDD), its current collection is very gone up bridge pwm signal output (PWM2OUT) and is passed through one first resistance to earth (R4) ground connection, described the first optocoupler (U1) is the low speed optocoupler, a described RC circuit (100) includes the second current-limiting resistance (R2) and is parallel to first speed-up capacitor (C1) of the second current-limiting resistance (R2), and this first speed-up capacitor (C1) is used for accelerating the ON/OFF speed of PNP pipe (T1);

Bridge drive circuit (11) once, it includes the second optocoupler (U2), the 2nd RC circuit (110), the second voltage-stabiliser tube (Z2) and the 2nd PNP pipe (T2), the anodic bonding front end power supply (VCC) of luminous tube in described the second optocoupler (U2), its negative electrode is connected with one the 3rd current-limiting resistance (R5), the other end of the 3rd current-limiting resistance (R5) is lower bridge pwm signal input (PWM2 IN), the grounded emitter of photosensitive tube in the second optocoupler (U2), its collector electrode is connected to the anode of the second voltage-stabiliser tube (Z2) by the 2nd RC circuit (110), the base stage that the negative electrode of the second voltage-stabiliser tube (Z2) and the 2nd PNP manage (T2) links to each other and the tie point of the two also is connected to rear end power supply (VDD) by one second pull-up resistor (R7), the emitter of the 2nd PNP pipe (T2) is connected to rear end power supply (VDD), its current collection very descends bridge pwm signal output (PWM2OUT) and passes through one second resistance to earth (R8) ground connection, described the second optocoupler (U1) is the low speed optocoupler, described the 2nd RC circuit (110) includes the 4th current-limiting resistance (R6) and is parallel to second speed-up capacitor (C2) of the 4th current-limiting resistance (R6), and this second speed-up capacitor (C2) is used for accelerating the ON/OFF speed of the 2nd PNP pipe (T2);

One interlock circuit (12), it includes the first diode (D1) and the second diode (D2), the anode of this first diode (D1) connects bridge pwm signal output (PWM1 OUT), negative electrode connects the anode of the second voltage-stabiliser tube (Z2), it is used for the high level signal of the upper bridge pwm signal output (PWM1 OUT) of feedback and vises the second voltage-stabiliser tube (Z2) as clamp voltage, to make the 2nd PNP pipe (T2) be off state, the anode of this second diode (D2) connects lower bridge pwm signal output (PWM2 OUT), negative electrode connects the anode of the first voltage-stabiliser tube (Z1), it is used for the high level signal of the lower bridge driving of feedback signal output part and vises the first voltage-stabiliser tube (Z1) as clamp voltage, is off state to make the 2nd PNP pipe (T2).