KR970002429Y1 - Power module destruction checking circuit of invertor - Google Patents

Abstract

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Description

Inverter power module destruction prevention circuit

1 is a power module destruction prevention circuit diagram of the present invention inverter.

* Explanation of symbols for main parts of the drawings

A: Micom C1, C2: Capacitor

TR1-TR6: Transistor PC1-PC7: Photocoupler

D1, D2: Diode

The present invention relates to a power module destruction prevention circuit of an inverter, and more particularly, to prevent the destruction of a power module by allowing a transceiver of a power module to be turned on with a predetermined delay time at the time of initial driving of a high power drive inverter. The present invention relates to a power module destruction prevention circuit.

In the case of the conventional inverter, the upper transistor and the lower transistor of the power module are sequentially turned on by the respective control signals output from the microcomputer to drive the load.

However, in the case of the inverter, the upper module and the lower transistor of the inverter are simultaneously controlled and turned on due to a malfunction of the microcomputer due to an abnormal voltage (overvoltage) or external noise that is instantaneously input during initial driving, thus destroying the transistor. Had a problem let go.

Therefore, an object of the present invention is to prevent the transistor of the power module from being destroyed by the simultaneous turn-on of the power module by causing the upper and lower transistors of the power module to be sequentially turned on with a predetermined delay during the initial operation of the inverter. have.

In order to achieve the above object, the present invention provides a microcomputer for outputting a predetermined controlled signal,

An upper and lower driving unit which receives a control signal from the micom and outputs a driving signal while turning on;

In the inverter consisting of a power module for driving the motor at high power while receiving a drive signal from the upper and lower drive unit, turn, off,

Upper and lower charging means for charging the power applied to the upper and lower drive unit,

It is characterized by consisting of a switching means for supplying and cutting off power to the lower drive unit by the upper and lower charging means.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a power module destruction prevention circuit diagram of the present invention,

A microcomputer for outputting a predetermined controlled signal,

An upper and lower driving part configured to receive a control signal from the microcomputer (A) and to turn on and off and output a driving signal;

In the inverter consisting of a power module consisting of upper and lower transistors (TR1-TR6) for driving the motor (M) with a large power while receiving a drive signal from the upper and lower drive unit,

Upper charging means which is a capacitor (C1) for charging power applied to the upper driving part of the upper and lower driving parts;

Light emitting means for emitting light by the charging voltage of the upper charging means;

Switching means which is a photocoupler (PC7) composed of a light receiving means for applying a drive signal to the lower drive while turning on, when receiving the signal emitted from the light emitting means;

It is composed of a lower charging means that is a capacitor (C2) for outputting the driving power while charging the voltage applied when the switching means is turned on.

In the drawings, reference numerals D1 and D2 denote diodes.

Referring to the effect of the present invention is configured as described above are as follows.

First, while the power is applied to the inverter, the microcomputer (A) controls the input signal and outputs the controlled signal through the output port to drive the motor (M).

The voltage signal output from the microcomputer (a) is charged through the diode D1 to the capacitor C1, which is a charging means, and the switching means connected to the rear end of the capacitor C1 until the charging is completed. It is not applied to the light emitting means of the light emitting means does not emit light.

Subsequently, when the charging of the capacitor C1 of the charging means is completed, the voltage signal of the capacitor C1 is applied to the light emitting means of the switching means so that the light emitting means emits light, and the voltage signal is the upper driving part of the upper and lower driving parts. The photo coupler PC1 is turned on, and the transistor TR1 of the power module connected to the rear stage is turned on.

On the other hand, when the light emitting means of the switching means is driven, the light emitting signal of the light emitting means is applied to the light receiving means of the switching means, so that the light receiving means is turned on so that the voltage signal applied from the microcomputer through the diode D2 is The capacitor C2 of the charging means is charged. At this time, the photocoupler PC4 of the lower driving part is not turned on until the capacitor C2 is completely charged, and the capacitor C2 is charged after a predetermined time has elapsed. When this is completed, the photocoupler PC4, which is the lower driving part of the upper and lower driving parts, is turned on, thereby driving the motor M because the transistor TR4 of the power module C is turned on.

In the above process, the upper and lower driving units are driven in sequence, and in this case as well, the voltage signal output from the microcomputer (C) is lowered until the charging of the capacitor C1 of the upper driving unit is completed. By disabling the driving unit, if the upper driving unit is not driven so that the abnormal operation and initial voltage of the microcomputer (A) are applied, the lower driving unit is not operated and the upper and lower driving units are not driven at the same time.

As described above, the present invention charges an applied signal with a condenser, and when the charging is completed, drives the upper driving part and drives the lower driving part using light emitting and receiving means, thereby allowing the upper and lower transistors of the power module to be driven. At the same time, it can be prevented from being turned on, and the upper and lower driving parts and the upper and lower transistors of the power module are prevented from being turned on at the same time by the malfunction of the microcomputer due to external noise and overvoltage during the initial driving, thereby preventing the transistor from destroying the power module. .

Claims (3)

A microcomputer that outputs a predetermined controlled signal, a top and bottom drive unit that receives a control signal from the micom, and turns on and outputs a driving signal, and a power module that drives the motor at high power while turning on and off a drive signal from the top and bottom drive units; An inverter comprising: upper and lower charging means for charging power applied to the upper and lower driving parts, and switching means for supplying and cutting off power to the lower driving part by the upper and lower charging means. Prevention circuit. 2. The power module destruction prevention circuit of an inverter according to claim 1, wherein the upper and lower charging means comprise capacitors (C1) and (C2). 2. The power module destruction prevention circuit of an inverter according to claim 1, wherein said switching means comprises a photo coupler (PC7).