Transformerless LED digital alarm clock

Horology: time measuring systems or devices – Power supply details – Electrical

Patent

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Details

368241, 368250, G04B 100, G04C 300, G04C 1700, G04C 2100

Patent

active

061479357

ABSTRACT:
A transformerless LED digital display clock circuitry using AC line voltage as a primary source of power is disclosed. The AC line voltage is substantially reduced to around 10 volts or less and then rectified to provide DC power to the quartz analog clock. Also included is a NiCad battery circuitry used as a power backup and to allow for occasional but high current using devices. The LED digital display is made up of four separate "digit" displays each independently controlled by four separate cathode outputs from a microprocessor.

REFERENCES:
patent: 4198629 (1980-04-01), Marion
patent: 4201039 (1980-05-01), Marion
patent: 4697930 (1987-10-01), Roberts et al.

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