Battery charger

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries

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Details

320 23, 320 36, 363132, H02J 704

Patent

active

050436503

ABSTRACT:
An isolated battery charger suitable for charging lead-acid batteries includes a high-frequency power conditioner that rectifies source current to a DC value and chops the current at a comparatively high frequency, e.g., 25 KHz, using a pair of MOSFET switches (138 and 140) to provide power pulses to the primary of a step-down transformer (T.sub.1). The output of the step-down transformer (T.sub.1) is presented to an enhancement mode MOSFET (206) in series circuit with the battery (B) to be charged with the gate bias of the MOSFET controlled in response to the sensed voltage of the battery to provide current to the battery as a function of its charge. Control circuitry is provided to limit charging to a small `trickle` level in the event the battery (B) is fully discharged to increase its charge level prior to initiating the full charge current. The provision of a voltage converter (100) operating at a relatively high frequency allows use of a lightweight and compact transformer (T.sub.1) that nonetheless provides a high current for charging.

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"Automatic Battery Charger"-ELEKTOR (Jul./Aug. 1979) 1, vol. 51/52, No. 7-8 (2 pages).
Elektor, No. 60, Apr. 1980, Canterbury GB--"Automatic Battery Charger".
N. T. I. S. Tech Notes, Feb. 1987, Springfield, VA., U.S.A.--p. 150 W. T. McLyman--"Ferroresonant Flux-Coupled Battery Charger" (NASA Tech Brief).

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