Method and apparatus for charging batteries

Details Method and apparatus for charging batteries Method and apparatus for charging batteries

2007-04-10

2007-04-10

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Capacitor charging or discharging

Reexamination Certificate

active

10915096

ABSTRACT:
According to a first aspect of the invention a battery charger and method of charging a battery includes an input circuit that receive an ac input having a period of T seconds and provides a dc signal. A converter receives the first dc signal and provides a converter output across a dc bus having a peak voltage of V volts. An output circuit receives the dc signal and provides a battery charging signal having a power of P watts. A controller, controls the converter to provide power factor correction. A bus capacitor is connected across the dc bus and has a capacitance of at least (3PT)/(V2) farads, or a capacitance to store sufficient energy to maintain the available output power signal through the duration of mechanical transient. The capacitance may be at least (4PT)/(V2), (5PT)/(V2), or (5.5PT)/(V2). Multiple output circuits may be provided, connected either one at a time, or a number at a time.

REFERENCES:
patent: 5601741 (1997-02-01), Thommes
patent: 6236014 (2001-05-01), Ulrich
patent: 6329636 (2001-12-01), Geissler

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