Systems and methods for multi-mode battery charging

Details Systems and methods for multi-mode battery charging Systems and methods for multi-mode battery charging

2011-08-23

2011-08-23

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

C320S141000, C320S143000, C320S162000

Reexamination Certificate

active

08004248

ABSTRACT:
Various systems and methods for battery charging are disclosed herein. As just one example, a battery charger is disclosed that includes a current feedback loop that has a pulse width modulated current control output, and a voltage feedback loop that has a pulse width modulated voltage control output. In addition, the battery charger includes a transition circuit with a digital phase/frequency detector. The digital phase/frequency detector is operable to detect a duty cycle difference between the pulse width modulated current control output and the pulse width modulated voltage control output. Further, the transition circuit is operable to transition between application of a substantially current charge control to a charging node to application of a substantially constant voltage to the charging node based at least in part on the difference in duty cycle.

REFERENCES:
patent: 5990666 (1999-11-01), Sekiya et al.
patent: 6222347 (2001-04-01), Gong
patent: 2005/0134220 (2005-06-01), Brohlin et al.

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