High-voltage side gate driving circuit capable of resisting common-mode noise interference

Abstract

The invention provides a high-voltage side gate driving circuit capable of resisting common-mode noise interference. The high-voltage side gate driving circuit mainly comprises a high-voltage level displacement circuit, a voltage conversion clamping circuit, a logic filtering circuit, an RS (Radio Sensing) trigger and an output drive stage circuit, wherein the high-voltage level displacement circuit converts a pulse generation signal at a low side to a high-voltage pulse signal at a high side; the voltage conversion clamping circuit is used for ensuring that double paths of noise signals output to the logic filtering circuit have the same time sequence, so as to prevent an inaccurate narrow pulse signal from being generated due to time mismatching; the logic filtering circuit filters a common-mode noise signal generated after passing through the voltage conversion clamping circuit, so that only a pulse signal in normal work is remained; and a square wave signal is output after the pulse signal passes through the output drive stage circuit, and an external high-side power tube is driven.

Description

technical field [0001] The invention relates to the technical field of high-voltage gate drive capable of resisting common-mode noise interference, and in particular to a design of a common-mode noise elimination circuit used in a half-bridge drive chip applied in the field of motor drive to prevent drive tubes from being misoperated. Background technique [0002] The drive circuit plays a very important role in many fields such as motors, automation control, and lighting. It can reduce the size of the product, improve reliability, increase stability, and improve efficiency. [0003] In recent years, with the enhancement of people's awareness of energy conservation and environmental protection, a variety of power electronic devices have emerged, which has led to the vigorous development of power integrated circuits that drive these devices, realizing the real "weak current" control of "strong current". Because of its small size, low cost, energy saving, high efficiency and i...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the common-mode noise suppression problem of the high-voltage gate drive chip, the present invention provides a high-voltage side gate drive circuit that can effectively avoid generating false trigger signals and is resistant to common-mode noise interference. The present invention can ensure reliable anti-interference of the overall circuit At the same time, it does not affect the normal working condition of the circuit, and at the same time improves the reliability of the system application

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