Anti-noise interference self-adaptive reset narrow pulse generation circuit

Abstract

The invention discloses an anti-noise interference self-adaptive reset narrow pulse generation circuit. A self-adaptive reset circuit, a discharge pulse circuit, an either-or selection circuit, a voltage comparator and a level signal and self-adaptive current signal generation circuit are additionally arranged on the basis of a traditional setting and resetting circuit; a self-adaptive reset signal output by the self-adaptive reset circuit and a reset signal output by the traditional reset circuit jointly serve as input signals of the alternative selection circuit, and when the width of generated common-mode dv / dt noise is larger than or equal to the width of an input pulse, the voltage comparator controls the either-or selection circuit to select a self-adaptive reset signal and a setting signal output by the traditional setting circuit to jointly form a driving signal of a post-stage high-voltage level shift circuit; on the contrary, the reset signal output by the traditional reset circuit and the setting signal output by the traditional setting circuit are selected to jointly form the driving signal of the post-stage high-voltage level shift circuit.

Description

technical field [0001] The invention relates to a two-way narrow pulse generating circuit for driving a high-voltage level shift circuit, in particular to an anti-noise interference adaptive reset narrow pulse generating circuit, which belongs to the technical field of analog integrated circuits (drive chips). Background technique [0002] Most of the power electronic chips or integrated circuit driver chip systems on the market now have two narrow pulse generator circuits. This circuit uses RC delay technology to generate two pulses on the rising and The narrow pulse signal is output to the high-voltage level shift circuit. The narrow pulse generating circuit belongs to one of the typical circuits of high voltage integrated (HVIC). This type of HVIC has a wide range of applications in LCD display, motor drive, and other consumer electronics and industrial control fields, all of which require high-voltage and low-voltage compatible processes, and use high-voltage LDMOS devi...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the noise interference problem existing in the above-mentioned prior art, the present invention provides an adaptive reset narrow pulse generating circuit that resists noise interference, and outputs the adaptive current signal to the adaptive current signal through the level signal and the adaptive current signal generating circuit. The reset circuit realizes a reset pulse signal adaptive to the input pulse signal IN, which can avoid common-mode dv / dt interference noise and filter out the reset pulse signal

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