DC-DC conversion charging apparatus

Details DC-DC conversion charging apparatus DC-DC conversion charging apparatus

2005-01-11

2005-01-11

Tso, Edward H. (Department: 2838)

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Pulsed

Reexamination Certificate

active

06841973

ABSTRACT:
The present invention provides a method of charging a rechargeable device (108) and a charging apparatus wherein the rechargeable device (108) is connected to a battery connection port (107) and ground (106), an external DC source having an input voltage (114) is connected to an input resistor (101) of a charging apparatus, a current reference value (109) and a voltage reference value (110) are fed to a control unit (104), a duty cycle (d) is determined in accordance with the current reference value (109) and the voltage reference value (110) fed to the control unit (104), and, using the duty cycle (d), an output voltage (402, 403) applied to the rechargeable device (108) is switched between a minimum output voltage (404) and a maximum output voltage (405) dependent on the current reference value (109) an the voltage reference value (110) by means of a charging switch (103).

REFERENCES:
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patent: 5610499 (1997-03-01), Rogers
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patent: 5815382 (1998-09-01), Saint-Pierre et al.
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patent: 0 762 594 (1997-12-01), None
patent: 9419860 (1994-09-01), None
International Search Report PCT/EP01/04860 dated Jan. 2002.

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