Charging circuit for an analog electronic timepiece

Details Charging circuit for an analog electronic timepiece Charging circuit for an analog electronic timepiece

1988-09-20

1989-11-21

Muska, Vit W.

Horology: time measuring systems or devices

Chronological

With supplemental power source

368160, 368204, 320 21, G04B 100, H01M 1046

Patent

active

048827177

ABSTRACT:
A chargeable analog electronic timepiece chargeable by an external A.C. voltage source includes a step motor which includes a driving coil. A motor driving circuit coupled to both terminals of the coil receives the A.C. voltage and selectively applies a charge to the coil for either driving the motor or charging a chargeable battery. A charge control circuit controls a period in which the switching circuit charges the chargeable battery and drives the motor. A PN junction placed in parallel to the switching circuit rectifies the A.C. voltage during charging of the secondary battery so that a single motor coil may drive the watch hands as well as charge the battery and a diode of the switching circuit may be utilized as the rectifier.

REFERENCES:
patent: 3922588 (1975-11-01), Kunzel
patent: 4644246 (1987-02-01), Knapen

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