Title:
OVERCHARGE PROTECTION, CHARGER, ELECTRONIC DEVICE AND TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/1999/060684
Kind Code:
A1
Abstract:
A method of preventing overcharge of a capacitor connected to a bridge rectifier circuit that comprises a first switch connected between a first AC input terminal and a first power supply line, a second switch connected between a second AC input terminal and the first power supply line, a third switch connected between the first input terminal and the second power supply line, and a fourth switch connected between the second input terminal and the second power supply line. The first and second switches, or the third and fourth switches, are turned on at the same time, so that a closed-loop for the AC power supply can be formed without short-circuiting the capacitor. Since voltage drops during overcharge protection, low-voltage circuit components can be used, thus facilitating manufacture of ICs. In addition, the voltage drop due to short braking on the generator rotor reduces noises produced by the generator coils and rotor.
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Inventors:
FUJISAWA TERUHIKO (JP)
Application Number:
PCT/JP1999/002582
Publication Date:
November 25, 1999
Filing Date:
May 18, 1999
Export Citation:
Assignee:
SEIKO EPSON CORP (JP)
FUJISAWA TERUHIKO (JP)
FUJISAWA TERUHIKO (JP)
International Classes:
H02M7/219; (IPC1-7): H02J1/00; H02J7/00
Foreign References:
| JPS63137541U | 1988-09-09 | |||
| JPH027834A | 1990-01-11 | |||
| JPH04138030A | 1992-05-12 |
Other References:
See also references of EP 1017146A4
Attorney, Agent or Firm:
Kawasaki, Kenji (Yaesumasuya Building 2-16, Nihonbashi 3-chome Chuo-ku Tokyo, JP)
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