Electric vehicle IGBT health monitoring system based on fiber grating sensor

Abstract

The invention discloses an electric vehicle IGBT health monitoring system based on a fiber grating sensor, which comprises a motor controller, an optical fiber demodulation system, a vehicle control unit, a thermal management system and an instrument, wherein the thermal management system is connected with a cooling channel of the motor controller, the motor controller comprises an IGBT power module assembly, a driving circuit module and a control circuit module, the IGBT power module assembly comprises a fiber grating sensor, six IGBT chips and six diodes, the fiber grating sensor comprises an optical fiber and an optical fiber connector, six fiber gratings are inscribed on the optical fiber, and the six fiber gratings are correspondingly pasted on the surfaces of the six IGBT chips respectively. According to the invention, after the IGBT power module assembly is operated for a long time, the IGBT thermal performance metamorphic degree can be evaluated, and the cooling water temperature target value of the thermal management system is rematched according to the metamorphic degree, so that a better heat dissipation environment is created for the steady-state operation of the IGBT power module assembly.

Description

technical field [0001] The invention belongs to the field of electric vehicle safety, and in particular relates to an electric vehicle IGBT health monitoring system based on a fiber grating sensor. Background technique [0002] With the continuous improvement of the performance of electric vehicles and the rapid development of autonomous driving technology, the requirements for the efficiency and reliability of electric vehicles are getting higher and higher. Insulated-gate bipolar transistors (IGBTs), as the core components of electric vehicle systems, are critical to their performance and reliability. For electric vehicles, due to the complex and changeable external environment and operating conditions, the operation of electric vehicles is uncertain, and the application environment of IGBTs is also more stringent. The main cause of IGBT failure is the rapid switching of high current and high voltage for a long time. This extreme working condition will make the operating ...

AI Technical Summary

Problems solved by technology

However, since the NTC sensor is arranged at a certain distance from the IGBT chip, the temperature collected by the NTC sensor cannot reflect the real temperature rise of the IGBT chip in the fastest and most accurate manner.

For example, Infineon's IGBT power module NTC sensor is arranged on the edge of the IGBT power module, which cannot reflect the junction temperature change of the IGBT chip in time

CN109443589A discloses a kind of IGBT module and the temperature monitoring system of IGBT module, it uses fiber grating to measure IGBT heating element temperature, can monitor the temperature of IGBT module in real time, but it does not relate to how to carry out electric vehicle IGBT health monitoring

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