System and method for automatically enabling rapid charging of a

Details System and method for automatically enabling rapid charging of a System and method for automatically enabling rapid charging of a

1996-09-23

1998-06-09

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Multi-rate charging

320163, 320164, H02J 700, H02J 704

Patent

active

057640351

ABSTRACT:
A system and method for automatically enabling rapid charging of a battery in a portable phone when a battery charger is connected to the portable phone is disclosed. The system includes a battery charger circuit having an input for receiving an input voltage from the battery charger, a sense resistor through which a rapid charging current from the battery charger input voltage is generated, a charge switch connected to the sense resistor which receives the battery charger circuit input, a trickle resistor connected in parallel to the charge switch through which a slow charging current from the battery charger input voltage is generated, wherein the rapid charging current is generated when the charge switch is closed and the trickle charging current is generated when the charge switch is open, and an output for supplying the generated charging current to the battery. The system also includes at least one voltage regulator having an input connected to the battery and an output for supplying a voltage to circuitry of the portable phone for controlling the battery charger circuit, as well as a circuit for selectively enabling the voltage regulator depending on the battery voltage. In this system, the rapid charging current may be supplied to the battery from the battery charging circuit only when the voltage regulator is enabled.

REFERENCES:
patent: 3854082 (1974-12-01), Nasby et al.
patent: 4992720 (1991-02-01), Hata
patent: 5130634 (1992-07-01), Kasai
patent: 5185565 (1993-02-01), Uchida
patent: 5254931 (1993-10-01), Martensson
patent: 5304917 (1994-04-01), Somerville
patent: 5382893 (1995-01-01), Dehnel
patent: 5402055 (1995-03-01), Nguyen

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