Full load to no-load control for a voltage fed resonant inverter

Details Full load to no-load control for a voltage fed resonant inverter Full load to no-load control for a voltage fed resonant inverter

1983-08-22

1985-09-10

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 17, 363 98, 363132, H02M 114

Patent

active

045410410

ABSTRACT:
A control for a voltage fed series resonant inverter includes controllable switch means which supplies square wave voltage signals to a resonant series circuit. The output of the inverter is coupled to a rectifier to provide dc power to a load. The control comprises summer means for comparing a commanded dc voltage to an actual dc output voltage and providing an error signal. An oscillator responsive to the error signal generates a frequency signal that is coupled to the controllable switch means to vary the frequency of the square wave voltage supplied to the resonant circuit. The duty cycle of the frequency signal is adjusted so that the frequency signal is provided in bursts during low load conditions thereby minimizing circulating currents while maintaining the output voltage with closed loop frequency control.

REFERENCES:
patent: 4446560 (1984-05-01), Gabor
patent: 4477868 (1984-10-01), Steigerwald

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