Power supply for pulsed magnets with magnetic energy recovery current switch

摘要

In this paper, we propose a power supply with magnetic energy recovery current switch for pulsed magnets, such as the synchrotron accelerator bending magnets, magnetizer. The switch which consists of four MOSFET elements and one capacitor, generates a fast pulsed current with low voltage, and it improves the power factor. The switch absorbs the magnetic energy stored in the inductance of the load into the capacitor. And in next time on, it regenerates the energy to the load. In addition, this switch operates in zero-voltage switching and zero-current switching, and the switching loss is very small. In order to turn on the load current at high speed in the circuit with an inductance, high voltage of several times higher than the voltage which maintains steady current. Therefore, by adopting this switch in the power source for pulsed power supply, high-speed pulsed current is efficiently generated by recovering the magnetic energy which has been stored in the inductance to the load in the next time on. As an application of DC circuit, a semiconductor Marx-generator which generates the high voltage pulse composed of a multistage magnetic energy recovery is described.