IGBT (insulated gate bipolar transistor) driver, signal processing method, motor control system and vehicle

Abstract

The invention discloses an IGBT (insulated gate bipolar transistor) driver, a signal processing method, a motor control system and a vehicle. The IGBT driver comprises an IGBT driving signal input circuit, a driving signal isolating circuit and a multi-IGBT output circuit which are connected in sequence, wherein the IGBT driving signals generated by the IGBT driving signal input circuit are addedto the multi-IGBT output circuit via the driving signal isolating circuit so as to drive each IGBT in the multi-IGBT output circuit to output signals. The IGBT driver also comprises a power source isolating circuit, wherein the power source isolating circuit comprises isolated output circuits individually corresponding to the IGBTs and a common output circuit corresponding to the whole of multiple IGBTs. The invention has the beneficial effects of achieving whole drive of multiple IGBTs and reducing the PCB area of the drive and protection circuit.

Description

technical field [0001] The present invention relates to IGBT driving, and specifically relates to an IGBT driver, a signal processing method, a motor control system and a vehicle. Background technique [0002] The function of the IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) drive circuit is to convert the switching signal from the microcontroller into a drive signal with sufficient power to ensure that the IGBT is turned on and off reliably. At the same time, the IGBT drive circuit also provides safe electrical isolation for the voltage between the microcontroller and the power transistors. In addition, in order to ensure that the IGBT is correctly and effectively protected when an overcurrent or short circuit fault occurs, the protection function is generally integrated into the drive circuit. Therefore, the performance of the IGBT driver is directly related to the reliability of the entire inverter system. The specific performance is mainly...

AI Technical Summary

Problems solved by technology

The invention adopts the input signal processing circuit with CPLD as the core, and overcomes the problem that the processing circuit is too complicated to be composed of separate logic devices

[0005] However, the circuit improvement of the above-mentioned driver only involves the improvement of a single driver, and currently in many applications, it involves the simultaneous use of multiple IGBTs, such as figure 1 As shown, the simultaneous use of multiple existing IGBTs generally chooses one of the above methods for single drive, for example, in figure 1 In the circuit shown, each phase of the three-phase bridge circuit is provided with its own power isolation circuit and fault isolation circuit for upper and lower bridge signals, and the front end is provided with its own PWM input signal processing, fault processing unit and pair of Unit for DC / DC conversion of power input

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