Power converter

Details Power converter Power converter

1994-11-14

1998-01-27

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

315307, H02M 3335

Patent

active

057127719

ABSTRACT:
A power convertor has a partial series resonant convertor circuit for supplying power at a substantially constant level to a load of variable impedance, and a control circuit for controlling the operation of the convertor circuit. The control circuit includes sensing lines for sensing a variation in load impedance below a threshold value, and regulating means responsive to the sensing lines for reducing the power supplied to the load by lowering an input control signed to a voltage-controlled oscillator. The control circuit is arranged to operate the convertor circuit in a first normal load mode in which the impedance of the load is above the threshold value and a second reduced load mode in which the impedance of the load is below the threshold value so as to limit a rise in current through the load. The invention extends to a method of controlling a power convertor.

REFERENCES:
patent: 4346332 (1982-08-01), Walden
patent: 4820891 (1989-04-01), Tanaka et al.
"Electronic Welder With High-Frequence Resonant Inverter" L. Malesani et al. 1993 IEEE Industry Application Conference Record, pp. 1073-1080.
"The Partial Series resonant Converter: A New Zero Voltage Switching Converter With Good Light Load Efficiency", P.C. Theron et al, IEEE Industry Application Society 1993 Conference Record, pp. 835-840.

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