Microprocessor-Based Universal Thyristor Switch and its Application to a PWM Inverter for Traction

Digital control of static power converters such as pulsewidth modulated (PWM) inverter realizes the precise waveform control which copes with interference problems by selective elimination of harmful harmonics not only in load voltage but also in source current. Moreover, software control has a great advantage in allowing such a flexible system design or adaptable modification of characteristics by only memory change or program revision with the hardware intact. In this paper, a novel system configuration technique using microprocessors is proposed.