Filter circuit of high-voltage drive circuit and high-voltage drive circuit

Abstract

The invention discloses a filter circuit of a high-voltage drive circuit and a high-voltage drive circuit. The filter circuit comprises a first inverter, a second inverter, a first delayed filter circuit, a second delayed filter circuit, a first NOR gate, and a second NOR gate. The first inverter receives a first level shifting signal and outputs a first inverting signal; the second inverter receives a second level shifting signal and outputs a second inverting signal; the first delayed filter circuit receives the first inverting signal and the second inverting signal respectively and outputs a first short time-delay signal and a second short time-delay signal; and the second delayed filter circuit receives the second inverting signal and the first inverting signal respectively and outputs a first long time-delay signal and a second long time-delay signal. The first NOR gate receives the first short time-delay signal and the first long time-delay signal and outputs a first NOR signal; and the second NOR gate receives the second short time-delay signal and the second long time-delay signal and outputs a second NOR signal. According to the filter circuit, the capability of filtering differential mode noises is enhanced while the common-mode noises are filtered and the noise filter efficiency is improved.

Description

technical field [0001] The invention relates to the field of high-voltage integrated circuits, in particular to digital-analog hybrid filter technology in high-voltage integrated circuits, and in particular to a filter circuit and a high-voltage drive circuit of a high-voltage drive circuit. Background technique [0002] High-voltage integrated circuit (HVIC) is a gate drive circuit with functions such as various protection circuits, low-voltage control circuits, and high-voltage power devices. It combines power electronics with semiconductor technology and significantly improves the integration and stability of the whole machine. , has the advantages of high integration density, small size, fast speed, and low power consumption. It gradually replaces traditional discrete devices and is increasingly used in MOSFETs (Metal-Oxide-Semiconductor or Field-Effect Transistor, metal-oxide layer -Semiconductor-field effect transistor), IGBT (Insulated Gate Bipolar Transistor, insulat...

AI Technical Summary

Problems solved by technology

In the level shift circuit, the turn-off speed of NMOS transistor N1 and NMOS transistor N2 is relatively slow, and the turn-on speed is relatively fast, so that the response time difference between different flipping threshold inverter circuits is small, so that only a small or even no output voltage can be generated. Differential mode filter time

It is understandable that if the NMOS transistor N1 and NMOS transistor N2 cannot filter out the differential mode noise when they are turned on quickly, it will affect the driving of the MOSFET or IGBT by the high voltage drive circuit

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