Dual mode battery chargers for portable electronic devices and r

Details Dual mode battery chargers for portable electronic devices and r Dual mode battery chargers for portable electronic devices and r

1997-08-27

1999-09-07

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Diverse charging or discharging rates for plural batteries

320140, H02J 700

Patent

active

059492163

ABSTRACT:
A dual mode battery charger includes an input that accepts a DC power signal, and a switch that switches the DC power signal from the input responsive to a control signal to generate a charging signal for the battery. A dual mode controller generates the control signal so that during a high current charging mode the switch is closed, and so that during a low current charging mode the switch is switched at a duty-cycle of less than 100 percent. In addition, a filter filters the charging signal to reduce a ripple portion thereof. Related methods and electronic devices are also discussed.

REFERENCES:
patent: 4684870 (1987-08-01), George et al.
patent: 5717309 (1998-02-01), Cho

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