Development of 100 kV/25 mA high voltage DC power supply with lower ripple

High voltage DC power supply is widely used in research and application areas of electron beam. Recently the method of decreasing ripple is a research hotspot due to the ripple of high voltage is the very key factor to quality of beams. This paper studies a novel circuit topology, which is comprised of a high bridge converter and a double polarity Cockcroft-Walton circuit with unsymmetrical capacitors. The experimental results show that the ripple is lower than 0.06% when the output voltage and current are 100 kV and 25 mA, respectively. Meanwhile the storage energy of high voltage units is only 0.85 of traditional circuit.