Soft-switching Ps-pwm Dc-dc Converter for Arc Welding
نویسنده
چکیده
Soft-switching DC-DC converter using Phase-Shifted Pulse Width Modulation (PS-PWM) on secondary side of highfrequency transformer is described in the paper. The converter consists of a full-bridge inverter fitted with fast IGBT transistors. The output power of the converter is controlled by rectifier made up of two snap-off diodes in series with MOSFET transistors which is connected on secondary side of high-frequency power transformer. This topology can easily achieve soft-switching operation also under low commutating current. The conduction losses are substantially reduced compared with conventional soft-switching DC/DC converters. The converter has been designed for arc welding with output power of 1.5 kW and switching frequency of 50 kHz.
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