Driving protection circuit for preventing bridge arm direct connection

Abstract

The invention discloses a driving protection circuit for preventing bridge arm direct connection, comprising a driving signal generation circuit, an upper half bridge driving circuit, a lower half bridge driving circuit, an interlocking circuit and a half bridge main circuit; the driving signal generation circuit is used for outputting generated upper half bridge driving signals and lower half bridge driving signals for; the upper half bridge driving circuit and the lower half bridge driving circuit comprise an upper half bridge driving unit and a lower half bridge driving unit; the upper half bridge driving unit and the lower half bridge driving unit perform isolation and amplification on the upper half bridge driving signal and the lower half bridge driving signal and output the signals through the upper half bridge driving output terminal and the lower half bridge driving output terminal; the interlocking circuit is used for performing interlocking protection on the upper half bridge and the lower half bridge according to the signals outputted by the upper half bridge output terminal and the lower half bridge output terminal of the upper half bridge output circuit and the lower half bridge output circuit; and the half bridge main circuit is used for preventing the bridge arm direction connection. The driving protection circuit for preventing bridge arm direction connection can prevent the IGBT from damage because of the bridge arm direct connection.

Description

technical field [0001] The invention relates to the technical field of drive protection circuits, in particular to an anti-bridge arm through drive protection circuit. Background technique [0002] In the main circuit of new energy grid-connected power generation and energy storage charge-discharge converters, such as half-bridge, full-bridge, and full-bridge shifted circuit topologies are widely used. If there is a direct connection between the upper and lower tubes, the bridge arm will be short-circuited. A large short-circuit current is formed, causing the switch tube to be damaged or even explode. [0003] The reasons for the straight-through of the bridge arm of the converter are as follows: digital processing chips such as DSP or MCU are affected by the stability of the power supply, which will cause program errors and generate wrong drive control signals; from DSP or MCU to the switch tube drive The wiring on the low-voltage side of the optocoupler may also be interf...

AI Technical Summary

Problems solved by technology

The way to detect the IGBT short circuit to block the bridge arm through is to remove the fault when the through fault has occurred, and the IGBT will pass a short-circuit current for a certain period of time, which will

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