Design of microarc oxidation supply and study of switching losses and positive snubber

Abstract

According to microarc oxidation characteristics and energy saving requirements, a square wave pulse current supply with positive lossy snubber was designed in this paper. The supply exhibits the following advantages: (a) The main circuit uses a kind of unit-parallel structures, so it can gain higher output current amplitude which can be adjusted to load variety. (b) Inductance components were used to transform energy and so these units can output sharper pulse-form constant current. (c) By applying soft-switching technology, security of switching component was increased and switching losses was reduced. (d) Pulse width modulation (PWM) method was used, that can regulate the amplitude, frequency and duty cycle of output pulse current independently. In this paper, the simulation without and with snubber was carried out; the effects of snubber on the switching losses of power component and supply were examined. A novel positive lossless snubber with absorption transformer was proposed.