Current synchronous zero voltage switching resonant topology

Details Current synchronous zero voltage switching resonant topology Current synchronous zero voltage switching resonant topology

1994-08-05

1997-03-25

Wong, Peter S.

Electric power conversion systems

Current conversion

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

323235, 315307, H02M 3335

Patent

active

056150938

ABSTRACT:
A power converter circuit provides low conversion losses, low generated noise and output power controllability. The circuit includes a controller, at least two transistors and an output network that provides impedance matching and operating point stabilization functions. The output network also enables zero voltage switching of the transistors, thus reducing radiated noise and minimizing (and possibly eliminating almost completely) switching losses. The controller circuitry includes an oscillator which is capable of self synchronizing to the resonant frequency of the components of the output network. Power modulation (e.g., for dimming of a lamp) is accomplished simply by desynchronizing and increasing the oscillator frequency. Thus, the control architecture allows the use of external parts of lower precision and cost while providing dimming capability in a single stage.

REFERENCES:
patent: 3916283 (1975-10-01), Burrows
patent: 4307441 (1981-12-01), Bello
patent: 5475285 (1995-12-01), Konopka
patent: 5479337 (1995-12-01), Voigt
IEEE Publication, "Dual Switched Mode Piower Converter"; Pallab Midya & Fred H. Schlereth; p. 155 1989.
Int. J. Electronics, "New soft-switching inverter for high efficiency electronic ballast with simple structure" E.C. Nho, et al., 1991, vol. 71, No. 3, 529-541.

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