Title:
充電回路及び時計回路
Document Type and Number:
Japanese Patent JP3948530
Kind Code:
B2
Abstract:
Charging a storage cell requires the electromotive force exerted at a photogenerating cell in addition to the voltage equal to or higher than the forward on voltage developed at an backflow preventing diode. Therefore, the charging is inefficient. Moreover, the area of the backflow preventing diode must be large in consideration for a current supply from the photogenerating cell at a high intensity of illumination. A charging circuit, constructed using a differential amplifier, which has a power supply therefor separated from another power supply, is used as a direction-of-current detecting circuit that detects the direction of current from a voltage difference between two different power supplies. Consequently, a switch is logically turned on or off depending on whether charging or non-charging is under way. Thus, on voltage to be developed during charging is lowered. Moreover, the size or area of a transistor that acts as a logical circuit is made smaller than that of the backflow preventing diode. Furthermore, the energy of a storage cell included in the charging circuit is hardly consumed in any states.
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Inventors:
Aihara Katsuyoshi
Takaaki Nozaki
Yoshiki Iwakura
Takaaki Nozaki
Yoshiki Iwakura
Application Number:
JP2003555646A
Publication Date:
July 25, 2007
Filing Date:
December 10, 2002
Export Citation:
Assignee:
Citizen Holdings Co., Ltd.
International Classes:
H02J7/35; G04C10/00; G04C10/02; G04G19/00; H01M10/44
Domestic Patent References:
| JP56107743A | ||||
| JP59008246U | ||||
| JP52080871A | ||||
| JP11069649A | ||||
| JP54082039A | ||||
| JP8251818A |
Attorney, Agent or Firm:
Atsushi Aoki
Jun Tsuruta
Tetsuro Shimada
Tomohiro Minamiyama
Masaya Nishiyama
Jun Tsuruta
Tetsuro Shimada
Tomohiro Minamiyama
Masaya Nishiyama