VME system based technique for IGBT Switching and Current Control

IGBT switching and current control technique has been developed using VME system. This technique uses VME digital input and output (DIO) card, IP330 analog in (AI) module and VME interrupt programming. This technique has been successfully used in switching and current control of IGBT based power supply of Radial Control Coil (RCC) of SST-1. The gate pulse trigger interface is of TTL type. With IGBT driver circuit, VME DIO card and IP330 AI module can be used for hysteresis band control of IGBT power circuit. Time response of DIO card is analyzed in isolation and along with feedback processing and status monitoring. DIO card pulse trigger rise and fall time along with feedback processing have been analyzed in detail to ensure 10 kHz switching range of IGBT. DIO card used for switching of IGBT has a very low-rise time of 30 ns and fall time of 170 ns. It alone can provide very high switching at TTL voltage interface. With appropriate driver circuit interface, VME system can be used for switching and current control of any IGBT based power supply using hysteresis band control technique. Feedback current is acquired using IP330 analog in module. Reference current (Iref) is provided through FO link interface in digital format. IP330 acquires feedback (I
_fback
) signal at acquisition rate of 10kHz with external clock trigger. Interrupt base processing has been programmed in VME system. Interrupt is generated through IP330 module after acquisition of all converted channels. Combination of VME DIO and VME IP330 Analog In module a feedback current and switching techniques have been successfully developed. Time response of VME modules and interrupt programming, results of output voltage waveforms at RCC power supply and MATLAB simulation are presented in this paper.