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IGBT fault indication circuit

A fault indication and indication circuit technology, applied in the field of IGBT applications, can solve the problems of inconvenient for inverter users to find the cause of faults, no intuitive indication of fault information, etc., and achieve the effect of convenient inspection

Active Publication Date: 2014-11-19
ANHUI ANKAI AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to protect the IGBT, when a short circuit or overcurrent fault occurs, the IGBT drive circuit will generate a fault signal. In the existing inverter, this fault signal is detected by software. When the fault signal is detected, the software will block the drive of the IGBT. signal or enable signal to achieve the purpose of protecting the IGBT, but there is no visual indication of fault information on the hardware, which is extremely inconvenient for the user of the inverter to find the cause of the fault

Method used

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  • IGBT fault indication circuit
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  • IGBT fault indication circuit

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Embodiment Construction

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

[0017] Such as figure 1 As shown, an IGBT fault indication circuit, an IGBT fault indication circuit, includes a fault signal 1, a first logic circuit 2, a second logic circuit 3, an indication circuit 4 and a clamping circuit 5, and the fault signal 1 and the first logic circuit The input end of the circuit 2 is connected, the output end of the first logic circuit 2 is connected with the input end of the indicating circuit 4 through the second logic circuit 3, the output end of the first logic circuit 2 is connected with the input end of the indicating circuit 4 through the clamping circuit 5 connected.

[0018] The first logic circuit 2 is composed of a first Schmitt trigger U1A and a first resistor R1, one end of the first resistor R1 is connected to the output end of the first Schmitt trigger U1A, and the other end of the first resistor R1 Connected to th...

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Abstract

The invention provides an IGBT fault indication circuit, which comprises a fault signal, a first logic circuit, a second logic circuit, an indication circuit and a clamp circuit, wherein the fault signal is connected with the input end of the first logic circuit; the output end of the first logic circuit is connected with the input end of the indication circuit via the second logic circuit; and the output end of the first logic circuit is connected with the input end of the indication circuit via the clamp circuit. According to the IGBT fault indication circuit, within the millisecond or even microsecond when over current fault or short circuit fault happens to the IGBT, fault happening can be intuitively recorded on the hardware, and checking for the fault reason is facilitated.

Description

[0001] technical field [0002] The invention relates to the field of IGBT application technology, in particular to an IGBT fault indication circuit. [0003] Background technique [0004] IGBT is the main power device of modern inverters and other power electronic equipment. Because of its high operating frequency, low driving power, and fast switching speed, it has been widely used, especially in high-power applications. In order to protect the IGBT, in the event of a short circuit or overcurrent fault, the IGBT drive circuit will generate a fault signal. In the existing inverter, this fault signal is detected by software. When the fault signal is detected, the software will block the drive of the IGBT. signal or enable signal to achieve the purpose of protecting the IGBT, but there is no visual indication of fault information on the hardware, which is extremely inconvenient for the user of the inverter to find the cause of the fault. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26
Inventor 赵圣宝陈顺东吴成加李韧王军蔡金
Owner ANHUI ANKAI AUTOMOBILE