Power device drive circuit with detection function

A technology for power devices and drive circuits, applied in the field of power device drive circuits, can solve the problem that the abnormal conduction state of power devices cannot be effectively detected, and achieves the effect of ensuring practicability and adaptability, simple and reliable circuits, and preventing damage.

Active Publication Date: 2013-04-24
XINFENGGUANG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general protection circuit is to collect the Vcesat (conduction voltage drop) voltage to detect the current of the power electronic device and realize the overcurrent protection, but it cannot effectively detect the abnormal conduction state of the power device when the driving signal is low.

Method used

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Such as figure 1 As shown, the circuit diagram of the power device drive circuit with detection function of the present invention is given, which is divided into two parts: an overcurrent detection circuit and a drive signal feedback circuit. The driving circuit of the present invention has two sets of isolated power supplies, which are signal side power supply and driving side power supply respectively, the signal side power supply is Vcc_+5V, GND; the signal side power supply is Vcc_+15V, Vcc_-10V and Vcc_0V.

[0018] The overcurrent detection circuit is composed of a diode D1, a Zener tube Z1, a triode T1, a photocoupler IC2, and resistors R2, R3, R4 and R5; the anode and cathode of the Zener tube Z1 shown are respectively connected to the base of T1, D1 The anode of Z1 is connected to the anode of the power device, the cathode of Z1 is conne...

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Abstract

The invention discloses a power device drive circuit with detection function. An overcurrent detection circuit comprises a diode D1, a voltage-regulator tube Z1, a triode T1 and a photoelectric coupler IC2, wherein the cathode and the anode of the voltage-regulator tube Z1 are respectively connected with the anode of the diode D1 and the base of the triode T1; and the collector of a secondary phototriode of the photoelectric coupler IC2 forms output signals SC of the overcurrent detection circuit. A drive signal feedback circuit comprises a diode D2, a voltage-regulator tube Z2, a triode T3 and a photoelectric coupler IC3, wherein the collector of a secondary phototriode of the photoelectric coupler IC3 forms output signals FS of the drive signal feedback circuit. According to the invention, the circuit can judge whether power devices have overcurrent or are abnormally conducted or cut off and timely protects the power devices so that the power devices are prevented from being damaged because of wrong conduction and wrong cutoff. The circuit has the characteristics of low cost, simplicity, reliability and strong anti-jamming capability, has strong adaptability and generalization, and can be used as an optimal circuit for driving high-power power electronic devices at present.

Description

technical field [0001] The present invention relates to a power device driving circuit with detection function, more specifically, to a power device driving circuit which can effectively detect the overcurrent, abnormal conduction and cut-off of the device. Background technique [0002] With the development and maturity of power electronic technology, high-power power electronic devices, such as IGBT, IGCT, IEGT, Mosfet, etc., are increasingly applied to industrial products. [0003] The current power electronic device technology and manufacturing process have reached a very high level, but the effective guarantee of reliable application of power electronic devices depends entirely on the design of the drive circuit and protection circuit. At present, the general protection circuit is to collect Vcesat (conduction voltage drop) voltage to detect the current of power electronic devices and realize overcurrent protection, but it cannot effectively detect the abnormal conducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/567H03K17/082
Inventor 张长元胡顺全魏学森郭少明郭延冲石广保
Owner XINFENGGUANG ELECTRONICS TECH CO LTD
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