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IGBT over-current detection circuit, chip and electronic equipment

A technology of overcurrent detection and electronic equipment, which is applied in the field of circuits, can solve the problem that the IGBT short circuit protection circuit is not suitable for RB-IGBT overcurrent protection, and achieve the effect of avoiding damage

Active Publication Date: 2020-06-09
ZHANGZHOU KEHUA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the embodiment of the present invention provides an IGBT overcurrent detection circuit, chip and electronic equipment to solve the problem that the traditional IGBT short circuit protection circuit in the prior art is not suitable for RB-IGBT overcurrent protection

Method used

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  • IGBT over-current detection circuit, chip and electronic equipment
  • IGBT over-current detection circuit, chip and electronic equipment
  • IGBT over-current detection circuit, chip and electronic equipment

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Embodiment Construction

[0030] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0031] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0032] The embodiment of the present invention provides an IGBT overcurrent detection circuit, such as image 3 As shown, the IGBT overcurrent detection circuit may include a controller U, a current limiting resistor R1, a transistor Q1 and a voltage dividing resistor ...

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Abstract

The invention is suitable for the technical field of circuits, and provides an IGBT over-current detection circuit, a chip and electronic equipment. The IGBT over-current detection circuit comprises acontroller, a current-limiting resistor, a switching device, a divider resistor and a divider resistor. The current-limiting resistor is connected between an IGBT driving signal output end of the controller and a first end of the switching device, and a first end of the switching device is further connected with an IGBT over-current detection signal input end of the controller; a second end of the switching device passes through the divider resistor and then serves as a detection end of the IGBT over-current detection circuit, and is used for being connected with a collector electrode of theIGBT to be detected. The IGBT over-current detection circuit, the chip and the electronic equipment provided by the embodiment of the invention can be used for the over-current protection of the RB-IGBT, and the problem that a traditional IGBT short-circuit protection circuit in the prior art is not suitable for the over-current protection of the RB-IGBT is solved.

Description

technical field [0001] The invention belongs to the field of circuit technology, and in particular relates to an IGBT overcurrent detection circuit, chip and electronic equipment. Background technique [0002] figure 1 The traditional IGBT (Insulated Gate Bipolar Transistor, IGBT for short) short-circuit protection circuit is shown, and its working process is briefly described as follows: [0003] (1) When the IGBT is turned off, S is turned on, the current source is bypassed by S, the non-inverting terminal of the comparator is clamped at 0 potential, and no short-circuit fault signal is output. Diode D blocks the influence of the IGBT collector high voltage on the detection circuit. [0004] (2) When the IGBT is turned on, S is turned off, and the current source forms a loop through the diode D and the IGBT. Since the tube voltage drop Vce is very low when the IGBT is saturated and turned on, the non-inverting terminal of the comparator is clamped at a low potential and...

Claims

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Application Information

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IPC IPC(8): G01R31/26H02H7/20
CPCG01R31/2608H02H7/20
Inventor 陈坤裕李育刚曾奕彰应秋菊
Owner ZHANGZHOU KEHUA TECH CO LTD
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