Development of High-power High-voltage Dc Power Supply Based on Series Resonant

High-power high-voltage dc power supply has been developed based on series resonant converter technology for a MW class RF amplifier. For low-voltage ripple, an IGBT inverter consisting of 1400 V-600 A devices is drives with a maximum switching frequency of 31.2 kHz. A performance test was carried out using an RF amplifier. We examined this power supply under two different conditions. One was with a voltage of 10 kV under a 1-sec rectangular-wave output current. The voltage ripple was 21 VPP with a peak current output of 92 A. The other was with the same voltage under a 24-msec half-sine wave output current. The voltage deviation was 150 VPP during the 24-msec half-sine wave output. A protection test for a short circuit in the RF amplifier was also examined. The test wire was not fuse. Therefore it was proved that this dc power supply can protect RF amplifier from a short circuit fault without a crowbar circuit. These experiments showed that the dc power supply had a low voltage ripple and high-speed response, thus verifying that it performed well for the MW class RF amplifier.