Lithium-ion battery charger input pre-regulator

Details Lithium-ion battery charger input pre-regulator Lithium-ion battery charger input pre-regulator

2005-02-22

2005-02-22

Tibbits, Pia (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

With detection of current or voltage amplitude

Reexamination Certificate

active

06859016

ABSTRACT:
A battery charger for charging a battery from a power source is provided. The battery charger includes a current sense circuit in series with the power source and the battery. A linear preregulator includes a first controlled switch coupled to the power source to generate a regulated output. The first controlled switch is responsive to a preregulator control signal, varying the first controlled switch impedance so that the regulated output is generated. A control circuit is powered by the preregulator regulated output. The control circuit generates the preregulator control signal and a charger control signal. A second controlled switch is coupled between the regulated output and the battery. The impedance of the second controlled switch is varied in response to the charger control signal so that a regulated flow of charge is supplied to the battery.

REFERENCES:
patent: 6057666 (2000-05-01), Dougherty et al.
patent: 6097351 (2000-08-01), Nishida
patent: 6118254 (2000-09-01), Faulk

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