Electronic watch and method of driving the same

Horology: time measuring systems or devices – Chronological – With supplemental power source

Patent

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Details

368204, 320 21, G04B 100, H01M 1046

Patent

active

057989850

ABSTRACT:
An electronic watch comprises a power supply 1 for generating electric energy by using external energy, a booster portion 2 having at least two booster circuits for sequentially repeating charging by the power supply 1 and boosting and discharging a charged voltage, a storage portion 3 for storing a charge discharged by the booster portion 2, a clock output portion 6 connected to an output terminal of the storage portion 3 and also connected to the power supply 1 by way of a reverse-blocking diode 8 for blocking the stored voltage from reversely flowing to the power supply 1, and a first voltage comparator portion 4 serving as a control portion, wherein the first voltage comparator portion 4 outputs a control signal for switching between charging and discharging of each booster circuit constituting the booster portion 2. Accordingly, effective charging can be made without being influenced by an internal resistance of the power supply 1, thereby reducing the variation of the stored voltage.

REFERENCES:
patent: 4397563 (1983-08-01), Ichinose
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

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