Horology: time measuring systems or devices – Power supply details
Patent
1996-01-29
1997-03-25
Miska, Vit W.
Horology: time measuring systems or devices
Power supply details
368204, G04B 100
Patent
active
056151780
ABSTRACT:
A compact and thin electronic control timepiece having a long duration time for indicating highly accurate time. The flow of an AC electromotive force induced in a coil in a generator powered by a power spring is supplied to a step-up circuit in an IC. The step-up circuit boosts the rectified electromotive force doubling to charge in a smoothing capacitor as storage power. A step-up control circuit generates a step-up control signal for controlling the step-up operation of the step-up circuit. A cycle comparing circuit compares a reference cycle signal from an oscillation circuit and a detected cycle signal synchronized with the rotational cycle of the generator, generates a cycle correction signal for eliminating a time difference between both signals, and outputs the signal to a load control circuit. The load control circuit in turn changes a load current on the generator by appropriately selecting a load resistor for changing switching elements within an internal circuit, controls the amount of an electromagnetic brake corresponding to a current amount flowing through the load resister and thereby governs the speed of the rotation cycle of the generator.
REFERENCES:
patent: 4441825 (1984-04-01), Morokawa
patent: 4730287 (1988-03-01), Yoshino et al.
patent: 4939707 (1990-07-01), Nagao
patent: 5001685 (1991-03-01), Hayakawa
patent: 5130960 (1992-07-01), Hayakawa
patent: 5278806 (1994-01-01), Affolter
Takahashi Osamu
Takakura Akira
Miska Vit W.
Seiko Epson Corporation
Seiko Instruments Inc.
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