Power converter

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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Details

363131, 323222, H02M 307

Patent

active

052629317

ABSTRACT:
A power converter has a resonant circuit composed of a serially connected inductor and capacitor. The resonant circuit is selectively connected to a DC voltage source, thereby establishing a charge cycle. The DC voltage source is normally derived from an AC voltage source by means of a rectifier and a filter capacitor. A second capacitor is selectively connected to the resonant circuit, thereby establishing a discharge cycle. The second capacitor is never connected with the resonant circuit simultaneously with the DC voltage source. The second capacitor serves as an output capacitor which maintains a substantially constant voltage. The second capacitor is connected to an external load. A control circuit synchronizes the charge transfers to the resonant frequency of the resonant circuit. The control circuit further measures the output voltage to determine if the second capacitor should be engaged in a discharge cycle in order to maintain its constant voltage. A regulated local power supply is provided to supply the control circuit with DC power. The DC power is derived from an AC voltage source. The local power supply is implemented in solid state.

REFERENCES:
patent: 3719859 (1973-03-01), Frantz
patent: 4184197 (1980-01-01), Cuk et al.
patent: 4346431 (1982-08-01), Steigerwald
patent: 4424558 (1984-01-01), N'Guyen Uyen
patent: 5027263 (1991-06-01), Harada
patent: 5181170 (1993-01-01), Huang et al.

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