Electronic watch and method of charging the same

Details Electronic watch and method of charging the same Electronic watch and method of charging the same

1997-01-06

1998-11-10

Roskoski, Bernard

Horology: time measuring systems or devices

Power supply details

Electrical

368205, G04B 100, G04C 300

Patent

active

058354573

ABSTRACT:
The electronic watch according to the invention comprises an energy source 1 (power supply), storage circuit 3, clock output unit 4, constant voltage circuit 5, voltage detection circuit 6, switching circuit 8, and control unit. The energy source 1 transforms external energy into electric energy and supplies a power supply voltage. The storage circuits 3 stores the power supply voltage or a booster voltage of the power supply voltage and thereby supplies a storage voltage. The clock output unit has a watch system and a condenser of a small capacitance, receives any of the power supply voltage or the booster voltage, and the storage voltage, and supplies a plurality of logic signals. The constant voltage circuit 5 generates a reference voltage from the clock voltage. The voltage detection circuit 6 compares the power supply voltage or booster voltage, storage voltage, and clock voltage selectively with a voltage set on the basis of the reference voltage and supplies a voltage detection signal. The switch circuit 8 is provided with a plurality of switches for controlling charging times of the storage circuit and the clock output unit. The control unit controls the switching circuit 8 by a plurality of pulse width variable switch control signals corresponding to a plurality of the logic signals and the voltage detection signal.

REFERENCES:
patent: 4730287 (1988-03-01), Yoshino et al.
patent: 4785435 (1988-11-01), Inoue et al.

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