The Drive Technology Research For High-Power IGBT

High-power IGBT in power electronic devices are faced with greater voltage stress and more harsh electromagnetic environmentAs the bridge of connecting the control circuit with power circuit,IGBT driver directly determines the IGBT working characteristics. So efficient and reliable IGBT driver can drive IGBT work in the ideal working condition and can crack the fault status. The paper proposed the driving conditions are required to meet the high power IGBT drive and protection requirements after research of the IGBT includes internal structure, operating characteristics and failure mechanism. In this paper,designed the high-power IGBT driver especially for package with IHM 130 x 140mm and Prime PACKTM separately based on analog circuits and FPGA.Firstly, this paper analysize the internal structure and the carrier movement characteristic, and in combination with the operatering characteristics and also make the research about the failture mechanism of IGBT, which is used for the selection of base of drive condition.The IGBT work characteristic is controlled by the drive voltage and the switch speed can be controlled by gate resistor; Based on feedback ideological designed the active clamp and di/dt feedback circuit to suppress peak voltage and optimized the key parameter of feedback loop.also the short-circuit fault protection is achieved by Uce sensing circuit and soft turn-off strategy,which effectively protect IGBT from thermal and voltage breakdown.Secondly,Designed the high power IGBT driver especially for the package with IHM 130 X 140mm based on analog circuit,which include DC/DC isolated auxiliary power, signal conditioning circuit, an auxiliary source under-voltage protection, short circuit protection based on VCE detection circuit, and through integrated active clamp circuit and di/dt feedback circuit realized turn-off voltage spike suppression.We simulate various application conditions to verify the effectiveness and reliability of the driver board in the double-pulse experiment platform and half-bridge experimental platform.On the base of the analog circuit driver, we applied FPGA as the core of the drive signal control system and optimized the signal sequence of drive and protection signal, which effective cracks the complexity of control circuit in analog circuit and improves the response speed of the driver. Paper proposes a dual N-MOSFET gate drive circuit structure, and with the soft turn-off circuit with the method by introducing a third gate drive circuit which greatly reduce the turn-off peak voltage value in short-circuit occasion.Finally with double-pulse experimental platform verified the effectness of active clamp circuit and short-circuit protection;also through simulate the high-power application with various switch frequence with the half-bridge experiment.The result indicates that the driver based on FPGA possesses fast response and excellent protection which can be applied to various industrial applications.