High-voltage side grid drive circuit resistant to power supply noise interference

Abstract

A high-voltage side grid drive circuit resistant to power supply noise interference comprises a floating power supply VB-VS, a dual pulse generating circuit, a high-voltage level shift circuit, a noise filtering circuit including a random detuning noise filtering circuit, an RS (reset-set) trigger and an output drive circuit. A common-mode noise filtering circuit is connected onto the random detuning noise filtering circuit, a first output end and a second output end of the common-mode noise filtering circuit are connected with a first input end and a second input end of the random detuning noise filtering circuit, and the common-mode noise filtering circuit comprises six NAND gates and four inverters and is capable of effectively filtering power supply common-mode noises generated during floating of the high-voltage side power supply VB, so that false triggering of the high-voltage side circuit caused by common-mode noise interference is avoided. The common-mode noise filtering circuit adopting a pure digital circuit and without a passive device is simple in structure, and suitable for application of chips of the high-voltage side grid drive circuit, a half-bridge drive circuit and an intelligent power module and the like.

Description

technical field [0001] The invention relates to the technical field of high-voltage-side gate drive circuits in power electronics technology, in particular to the application of high-voltage-side gate drive circuits, half-bridge drive circuits, and intelligent power modules and other chips. Background technique [0002] With the development of power electronics technology, high-voltage integrated circuits have significantly improved the integration and stability of the whole machine by integrating low-voltage control circuits, various protection circuits, and high-voltage power devices. Fast, low power consumption and other advantages, has played a very important role in the national economy. The half-bridge driver chip is a high-voltage integrated circuit that adopts advanced floating power supply mode. It is a monolithic integration of high-voltage electronic devices and traditional logic circuits or analog circuits that play a control role. In recent years, it has gradual...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the prior art of anti-common-mode noise interference of the high-voltage side gate drive circuit, and provides a high-voltage side gate drive circuit with a simple structure and a pure digital circuit that resists power supply noise interference, effectively eliminating the high-voltage side gate drive circuit Common mode noise and random offset noise interference caused by power supply VB floating

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