Digitally programmable symmetrical power pulse generator using SiC power switches

Abstract

Design, realization, and characteristics of a power pulse generator using silicon carbide (SiC) power switches are presented. The generator is used to generate symmetrical output pulses with adjustable voltage, frequency, and other parameters. The generator is controlled by a microprocessor with an integrated FPGA. All generator parameters like switching frequency, duty cycle, dead times, output voltage, or maximum values of output voltage and current can be all digitally set from the PC over a serial line. The output voltage can be set in a 150 V - 600 V range for each pole, meaning Vpp is set between 300 V - 1200 V. Prototype of the proposed generator was constructed, using adjusted half-bridge topology for DC-DC converter and 3-level T-type topology for power stage, with SiC transistors and rectifier diodes. Finally, the prototype was tested with different values of output voltage and power up to 500 W.