Level shift circuit

Abstract

The invention provides a level shift circuit for controlling on-off of a power tube. The level shift circuit comprises a narrow pulse generator which outputs a first narrow pulse signals according to a rising edge of low-pressure duty ratio signals and outputting second narrow pulse signals according to a falling edge of the input low-pressure duty ratio signals; a level shift module which reverses the first narrow pulse signals and lifts level to somewhere between the positive electrode of a floating power supply and the ground to obtain first high-level reverse signals and reverses the second narrow pulse signals and lifts level to somewhere between the positive electrode of the floating power supply and the ground to obtain second high-level reverse signals; a signal latch register which outputs high-pressure duty ratio signals according to the first high-level reverse signals and the second high-level reverse signals; and a driving-grade circuit which controls the opening and closing of the power tube according to the high-pressure duty ratio signals and has an input end accessed to the high-level duty ratio signals and an output end connected with the grid of the power tube. According to the invention, the short-pulse driving capability is large, level shift is rapidly realized, the level shift time is shortened, and power consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of control of high-voltage devices, in particular to a level shift circuit suitable for floating power supply rails. Background technique [0002] The level shift circuit converts the low-voltage control signal into a high-voltage control signal, and realizes the control of the low-voltage logic on the high-voltage power output stage. ) and FLASH memory circuits have been widely used. In the field of control technology for high-voltage devices, the control circuit and high-voltage output drive circuit can be integrated to achieve high withstand voltage, high current, and high precision. [0003] A conventional level shift circuit converts a low-voltage control signal into a high-voltage control signal for driving an output-stage NMOS (should be an NMOS) tube operating under high voltage. As a key circuit connecting the control circuit and the output driver stage, the level shift circuit requires fast respo...

AI Technical Summary

Problems solved by technology

In the prior art, Zener tubes are usually used as clamping components in level shift circuits. This structure has the problems of high cost and high process requirements.

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