A gate drive circuit without static power consumption

Abstract

A gate drive circuit without static power consumption belongs to the technical field of electronic circuits. The floating power supply ground module is used to generate floating power supply ground signals and high-side reset signals; the low-voltage-high-voltage level shift module is used to level-shift the low-voltage drive signal of the previous stage to the high-voltage side to control the high-side power tube; The low-voltage level shift module is used to feed back the signal of the high side of the floating power supply to the low side, and the input stage in the low-voltage-high voltage level shift module is closed through the logic control module, thereby ensuring that the gate drive circuit provided by the present invention has no static Power consumption; the drive output module uses the high-side drive output unit and the low-side drive output unit to respectively drive the high-side power transistor and the low-side power transistor, and the logic control module provides logic control. The invention does not have static power consumption, and at the same time, it well solves the problem of gate-source withstand voltage.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to a gate drive circuit without static power consumption. Background technique [0002] Gate drive circuits are involved in many chips, such as DC / DC converters, LED drivers, motor drivers, and Class D audio amplifiers. The traditional gate drive circuit is the level shifter (level shift) + inverter cascaded driving method, such as figure 1 As shown, this driving method has the following two disadvantages: [0003] 1. The circuit has static power consumption, which is not suitable for low power consumption systems. [0004] 2. The gate-source withstand voltage of the MOS tube. Since the cascade drive of the inverter is used, the withstand voltage between the gate and the source of the MOS tube must be greater than the power supply voltage, which will be limited by the process. [0005] Therefore, it is necessary to design a gate drive circuit with low static power consumption and ...

AI Technical Summary

Problems solved by technology

[0006] In view of the above disadvantages, the present invention provides a gate drive circuit without static power consumption, which is driven by a floating power supply mode, and the high-side power tube HMP and the low-side power tube HMN are driven separately, which is a good solution The problem of gate-source withstand voltage

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