H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 3/335 (2006.01)
Patent
CA 2097421
A DC-to-DC converter (10) is operated in accordance with a predetermined primary circuit ON time (tON) and a sensed predetermined secondary circuit current level (IS) to provide improved charging performance and extended battery life. En- ergy is stored in the primary (14) of a coupled inductor (12) when power in the primary, provided by a battery (20) having an internal impedance (24) which varies over the battery's lifetime, is switched ON for a predetermined time tON. Upon expira- tion of time tON, power is switched OFF, whereupon stored energy is transferred to the secondary (16) via a flyback type process, thus charging a storage capacitor (28). A preventing means (56) prevents a premature switching ON of power in the primary (14) subsequent to the expiration of time tON. The energy storage cycle repeats when current (IS) sensed in the sec- ondary decreases below a predetermined minimum current threshold (IMIN).
Dunsmore Clay Allen
Ludden Christopher Anthony
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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