AC Resonant charger with charge rate unrelated to primary power

Details AC Resonant charger with charge rate unrelated to primary power AC Resonant charger with charge rate unrelated to primary power

1979-12-07

1982-05-11

Gellner, Michael L.

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

With rectification or derectification

307109, 307151, 363 87, 363129, 320 1, H02M 7155

Patent

active

043295959

ABSTRACT:
An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input. A full-wave rectifier couples the secondary winding of the transformer to the load so that the load capacitance is always charged with the same polarity.

REFERENCES:
patent: 3154695 (1964-10-01), Mac Gregor et al.
patent: 3541421 (1970-11-01), Buchman
patent: 3593105 (1971-10-01), Brohaugh
patent: 3611097 (1971-10-01), Joslyn
patent: 3772601 (1973-11-01), Smith
patent: 3772613 (1973-11-01), Smith
patent: 3806829 (1974-04-01), Duston et al.
patent: 3860864 (1975-01-01), Fitz
patent: 3896396 (1975-07-01), Whitehouse et al.
patent: 3921035 (1975-11-01), Holmes
patent: 4099807 (1978-07-01), Barnes

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