Electronic wristwatch with generator

Details Electronic wristwatch with generator Electronic wristwatch with generator

1989-01-24

1991-03-19

Roskoski, Bernard

Horology: time measuring systems or devices

Power supply details

Electrical

368203, G04B 100, G04C 300

Patent

active

050016857

ABSTRACT:
An electronic wristwatch including an a.c. generator having an output which is rectified using a half-wave rectifier. The half-wave rectified output of the generator is stored in a capacitor serving as a secondary power supply. Booster circuitry is operable for increasing and decreasing the voltage of the secondary power supply which is then applied across an auxiliary capacitor used for powering the wristwatch. Additional circuitry provides a suitable voltage across the auxiliary capacitor for driving the watch when the voltage across the secondary power supply is at or below a predetermined level. A pair of detecting circuits detect the maximum and minimum permissible voltage levels of the secondary power supply and auxiliary capacitor.

REFERENCES:
patent: 4208869 (1980-06-01), Hanaoka
patent: 4634953 (1987-01-01), Shoji et al.
patent: 4653931 (1987-03-01), Takeda
patent: 4730287 (1988-03-01), Yoshino et al.
patent: 4785435 (1988-11-01), Inoue et al.

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