IGBT (Insulated Gate Bipolar Translator) driving circuit and motor controller

Abstract

The invention discloses an IGBT (Insulated Gate Bipolar Translator) driving circuit and a motor controller. The IGBT driving circuit comprises a positive busbar, a negative busbar, an output busbar, an upper bridge IGBT tube and a lower bridge IGBT tube, the upper bridge IGBT tube is arranged between the positive busbar and the output busbar, the lower bridge IGBT tube is arranged between the negative busbar and the output busbar, the IGBT driving circuit further comprises a first overvoltage protection circuit and a second overvoltage protection circuit, the first overvoltage protection circuit is connected with the output busbar and the upper bridge IGBT tube, the upper-bridge IGBT charging module is used for charging a gate capacitor of the upper-bridge IGBT according to the upper-bridge induced voltage between the output busbar and the upper-bridge IGBT; and the second overvoltage protection circuit is connected with the negative busbar and the lower bridge IGBT tube and is used for charging the gate capacitor of the lower bridge IGBT tube according to the lower bridge induced voltage between the negative busbar and the lower bridge IGBT tube. The IGBT driving circuit mainly utilizes the induced voltage generated by the stray inductance of the busbar to delay the turn-off time of the IGBT tube, so as to reduce the potential overvoltage risk of the IGBT tube at the turn-off moment, effectively protect the IGBT tube, ensure the clamping effect, and have low device cost.

Description

technical field [0001] The invention relates to the technical field of automotive electronic design, in particular to an IGBT drive circuit and a motor controller. Background technique [0002] The popularization of new energy vehicles is the theme of the current development of the automotive industry. As the core component of the motor controller, its functional safety design has received more and more attention. The IGBT driver chip is the core device of the motor controller, and generally has its own desaturation overcurrent protection function, but in the case of overvoltage, an additional overvoltage protection circuit is generally required to achieve overvoltage protection. Due to the stray inductance between the collector (hereinafter referred to as C pole) and the emitter (hereinafter referred to as E pole) of the IGBT, the rapidly changing current at the moment the IGBT is turned off generates an induced voltage, which is superimposed on the bus voltage terminal, th...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide an IGBT drive circuit and a motor controller to solve the problem that the active clamp circuit in the IGBT drive circuit cannot take into account both cost and clamp effect

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