Gate Drive Power Supply for On-board Marx Circuit Using only Charging Path of Marx Capacitor

This paper proposes a gate drive power supply method for a Marx circuit with high-voltage output. The conventional gate drive power supply method has a disadvantage that the gate drive requires expensive and huge DC-DC converters to secure the insulation distance because of the high-voltage operation of the Marx circuit. In this paper, the gate drive power is supplied through a transformer inserted into the charging path of the Marx capacitor in order to overcome these problems. The inserted transformer also plays a role in suppressing the rush current during the charging operation of the Marx circuit. The proposed power supply method reduces the gate circuit volume and improves efficiency. In this paper, the parameter design for obtaining the desired gate drive power is explained. Then, it is verified that a driving power of 1 W or more is obtained by simulation and prototype. The charging current flowing during charging is suppressed by 75%, and the loss during charging was reduced.