Compact Digital High Voltage Charger

The high voltage (HV) charger for modulators and accelerators is investigated with classical resonant circuit working at over 30 kHz and zero-current-switching (ZCS) condition, which charges the loads more accurately for the increased voltage steps by working in higher frequency. The compact charger is composed by low voltage (LV) control panel and HV transformer, which can work in the modes of DC charging or bursts whenever necessary. Comparing with conventional pulse width modulation (PWM) method, the switch losses of power devices are significantly decreased by above ZCS soft switch approach used in the resonant circuit. The experimental setup with above topology is tested at 69 kHz. The high speed IGBT drivers, which cut the turn-on and turn-off times of the commercial drivers from 1μs to 0.1μs, are developed and implemented in about system.