METHOD OF OVERCHARGE PREVENTION, CHARGER CIRCUIT, ELECTRONIC DEVICE, AND TIMEPIECE

Title:

METHOD OF OVERCHARGE PREVENTION, CHARGER CIRCUIT, ELECTRONIC DEVICE, AND TIMEPIECE

Document Type and Number:

WIPO Patent Application WO/1999/048184

Kind Code:

A1

Abstract:

A charger circuit includes first and second switch units that, depending on the voltage at one input terminal for receiving AC current, decide whether to connect between the other input terminal and a first power supply line; first and second diodes connected between the input terminals and a second power supply line; and a rechargeable device connected between the first and second power supply lines. The voltage of the charged device is detected, and the detected voltage is compared with a predetermined reference voltage. If the charged voltage exceeds the reference voltage, the generated current flowing from one of the input terminals is supplied to the other input terminal through a path that does not include the first and second diodes. Therefore, this charger circuit only requires a single comparator, and thus it becomes compact and consumes less power.

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Inventors:

FUJISAWA TERUHIKO (JP)

Application Number:

PCT/JP1999/001383

Publication Date:

September 23, 1999

Filing Date:

March 19, 1999

Export Citation:

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Assignee:

SEIKO EPSON CORP (JP)
FUJISAWA TERUHIKO (JP)

International Classes:

H02J7/02; (IPC1-7): H02J1/00; H02J7/00

Foreign References:

JPS63137541U	1988-09-09
JP2652057B2	1997-09-10

Other References: