Abstract :
A new high-frequency DC/DC power converter, suitable for application in the kilowatt range, is presented. The topology is based on a half bridge series resonant power converter, i.e., having only two switches. Resonance occurs only for a part of each switching cycle, and a discrete energy pulse is transferred to the load every half cycle, rendering a variable frequency controller for controlling the output power. The power converter features zero-voltage turn-on, and snubbed turn-off at reduced current for the switching devices, and zero current commutation of the rectifier diodes, making it suitable for IGBT switches operating at a switching frequency higher than 20 kHz. The efficiency of the power converter is very high under full load and low load conditions, while the dynamic output voltage range is two times larger than that of the conventional half-bridge series resonant power converter
Keywords :
DC-DC power convertors; bipolar transistor switches; bridge circuits; circuit resonance; circuit testing; commutation; insulated gate bipolar transistors; network analysis; power bipolar transistors; power semiconductor switches; resonant power convertors; switching circuits; HF DC/DC power converter; IGBT switches; discrete energy pulse; dynamic output voltage range; efficiency; full load; half-bridge series resonant power converter; low load; output power control; rectifier diode; snubbed turn-off; switching cycle; switching frequency; variable frequency controller; zero current commutation; zero-voltage turn-on; Bridge circuits; Diodes; Frequency; Power generation; Rectifiers; Resonance; Switches; Switching converters; Topology; Zero voltage switching;
