Electricity: battery or capacitor charging or discharging – Battery or cell charging – With detection of current or voltage amplitude
Reexamination Certificate
2004-11-29
2008-07-29
Vu, Bao Q. (Department: 2838)
Electricity: battery or capacitor charging or discharging
Battery or cell charging
With detection of current or voltage amplitude
C320S163000
Reexamination Certificate
active
07405539
ABSTRACT:
The present invention provides a battery charger and a method for preventing an overshoot charging current during a mode transition. The battery charger includes a charging regulation circuit for outputting a charging current whose amount is regulated based on a regulation signal at a control terminal, a first current sensing unit for sensing a current level and outputting an error signal based on both the current level and a first reference signal, an operational amplifier for generating the regulation signal, and a reference voltage generator which includes an ADC for converting the error signal outputted by the current sensing unit to a digital signal, and a DAC for converting the digital signal to a reference voltage.
REFERENCES:
patent: 2005/0212489 (2005-09-01), Denning et al.
Microelectronic Circuits Fourth Edition by Sedra and Smith, Oxford University Press, 1998; pp. 862-863 and Fig. 10.34.
Hsu Winston
Mediatek Incorporation
Muralidar Richard V
Vu Bao Q.
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