DC-DC converter in watch system

Details DC-DC converter in watch system DC-DC converter in watch system

1975-07-14

1977-03-29

Jackmon, E. S.

Electricity: power supply or regulation systems

Remote sensing

321 2, 323 17, 323 22T, 323DIG1, G04C 360, G05F 158

Patent

active

040141659

ABSTRACT:
A solid state watch having a DC to DC power converter responsive to timekeeping signals for powering a liquid crystal display. The power converter comprises a one-shot multivibrator responsive to an oscillatory timing signal from the timekeeping circuitry for generating a series of one-shot pulses having controlled width. A switching regulator is coupled to the one-shot multivibrator and converts a relatively low DC supply voltage into a relatively high DC output voltage in response to the oscillatory input signal. The switching regulator has temperature compensating feedback for compensating the output of the regulator in accordance with liquid crystal display characteristics with respect to ambient temperature changes.

REFERENCES:
patent: 3818484 (1974-06-01), Navamura et al.
patent: 3828547 (1974-08-01), Fujita

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