Bootstrap-supply MOSFET (metal oxide semiconductor field effect transistor)/IGBT (insulated gate bipolar translator) driver circuit having negative voltage

Abstract

The invention discloses a bootstrap-supply MOSFET (metal oxide semiconductor field effect transistor) / IGBT (insulated gate bipolar translator) driver circuit having negative voltage. The bootstrap-supply MOSFET / IGBT driver circuit comprises an upper power tube M1 driving circuit and a lower power tube M2 driving circuit, wherein the upper power tube M1 driving circuit comprises a bootstrap supply circuit, an upper push-pull driving circuit, an upper negative voltage generating circuit and an upper protection circuit; the lower power tube M2 driving circuit comprises a low-voltage DC stabilized power supply, a lower push-pull driving circuit, a lower negative voltage generating circuit and a lower protection circuit. The bootstrap-supply MOSFET / IGBT driver circuit has the advantages as follows: because a negative voltage circuit cannot be effectively added on the basis of the conventional bootstrap supply, the problems that an upper bridge arm MOSFET / IGBT cannot be reliably turned off, and in case of a large load, upper and lower bridge arms are directly connected, equipment are burnt down finally are solved; the simplicity of the circuits is ensured, and meanwhile, a reliable turn-off of power tubes is ensured.

Description

technical field [0001] The invention relates to a drive device for a converter IGBT or MOSFET gate circuit, in particular to a bootstrap power supply MOSFET / IGBT drive circuit with negative voltage. Background technique [0002] The performance of the power converter is largely limited by the switching performance of the power switch tube MOSFET / IGBT (MOSFET: Metal-Oxide-Semiconductor-Field-Effect Transistor; IGBT: Insulated Gate Bipolar Transistor), so the drive of MOSFET / IGBT Circuits play an important role in power electronic systems. The improvement of the driving circuit of the power tube is mainly from the following aspects: [0003] (1) Reduce the switching time, thereby improving the efficiency of the power conversion system, such as active drive lines. [0004] (2) To improve the reliability of the circuit, the negative pressure is used to ensure the reliable shutdown of the switch tube, and the feedback of the detection signal of overvoltage, overcurrent, etc., s...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the above problems, and proposes a bootstrap power supply MOSFET / IGBT drive circuit with negative voltage, which effectively solves the problem that the traditional bootstrap power supply cannot effectively increase the negative voltage circuit, which causes the upper bridge arm MOSFET / IGBT It cannot be turned off reliably, and when the load is heavy, it is easy to cause the upper and lower bridge arms to pass through, and eventually burn the equipment; it not only ensures the simplicity of the circuit, but also ensures the reliable shutdown of the power tube

Images