Electronic timepiece having a voltage conversion circuit

Details Electronic timepiece having a voltage conversion circuit Electronic timepiece having a voltage conversion circuit

1979-08-07

1980-09-09

Jackmon, Edith S.

Horology: time measuring systems or devices

With calendar indicator

Setting or resetting

340752, 368 10, 368 66, G04B 1924, G08B 2100

Patent

active

042211115

ABSTRACT:
An electronic timepiece having a voltage conversion circuit for providing a different supply voltage from the timepiece battery voltage, detection means for detecting a condition in which a drive signal of relatively high voltage must be applied to an electromagnetic transducer of the timepiece, which is driven intermittently, switching means controlled by the detection means for selecting either the battery voltage or the converted voltage, and a circuit containing a capacitor which is charged by the output voltage of the switching means while the electromagnetic transducer is not being driven, and is discharged by supplying power to the transducer when the latter is driven, so that drive power is supplied to the transducer from, in effect, a low impedance source.

REFERENCES:
patent: 3855781 (1974-12-01), Chihara et al.
patent: 3992868 (1976-11-01), Tamaru et al.

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