Apparatus and method for magnetic charger IC for batteries...

Details Apparatus and method for magnetic charger IC for batteries... Apparatus and method for magnetic charger IC for batteries...

2005-09-30

2009-08-04

Ullah, Akm E (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

With charging

C320S111000, C320S137000, C320S140000, C323S282000

Reexamination Certificate

active

07570020

ABSTRACT:
A voltage regulation and battery charging system is provided. The system may include a switching regulator selection control circuit, two switching regulator controller circuits, two power transistors, a common synchronous transistor, a common LC circuit, and a battery charger circuit. The two switching regulator controller circuits may synchronously switch the two power transistors and the one common synchronous transistor. One of the switching regulator controller circuits may receive voltage from an AC adapter and the other may receive voltage from the battery. The first switching regulator controller circuit is employed to provide system power when the AC adapter is connected. When the battery is used to provide the system power, the second switching regulator controller circuit is used to down-convert the battery voltage to provide the system power.

REFERENCES:
patent: 5598089 (1997-01-01), Shintomi
patent: 5721481 (1998-02-01), Narita et al.
patent: 6157168 (2000-12-01), Malik
patent: 2003/0220026 (2003-11-01), Oki et al.
patent: 2004/0145348 (2004-07-01), Bucur et al.
patent: 2005/0057238 (2005-03-01), Yoshida
Texas Instruments Datasheet (2004) “Synchronous Switchmode, Li-Ion and Li-Pol Charge Management IC with Integrated Powerfets (bqSWITCHER™),” pp. 1-5.

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