Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1990-12-26
1992-03-31
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 315241P, 3541451, H02M 3335, H05B 4132
Patent
active
051013355
ABSTRACT:
A DC-to-DC converter is operated in accordance with a predetermined primary circuit ON time and a sensed predetermined secondary circuit current level to provide improved charging performance and extended battery life. Energy is stored in the primary of a coupled inductor when power in the primary, provided by a battery having an internal impedance which varies over the battery's lifetime, is switched ON for a predetermined time t.sub.ON. Upon expiration of time t.sub.ON, power is switched OFF, whereupon stored energy is transferred to the secondary via a flyback type process, thus charging a storage capacitor. A preventing means prevents a premature switching ON of power in the primary subsequent to the expiration of time t.sub.ON. The energy storage cycle repeats when current sensed in the secondary decreases below a predetermined minimum current threshold.
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Dunsmore Clay A.
Ludden Christopher A.
Balconi-Lamica Michael J.
Eastman Kodak Company
Wong Peter S.
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