Transformerless clock circuit with duplex optoelectronic display

Details Transformerless clock circuit with duplex optoelectronic display Transformerless clock circuit with duplex optoelectronic display

1986-08-28

1987-10-06

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With electro-optical display

368204, 340811, G04C 1900, G04B 100

Patent

active

046979301

ABSTRACT:
A transformerless power supply and display energizing circuit for a clock circuit with a duplex optoelectronic display driven by a low voltage integrated clock circuit having positive and negative voltage input terminals and the duplex display having a first terminal connected to a first common cathode and a second terminal connected to a second common cathode of the display for energizing it. The transformerless circuit is powered from an AC source. An impedance, which may be either resistive or reactive, reducing the AC voltage to a level suitable for the integrated clock circuit. The transformerless circuit generates synchronous DC level-shifted pulse trains for driving the positive input terminal of the integrated clock circuit alternately between a first voltage and a reference voltage while synchronously driving the display first terminal between said first voltage and a voltage of equal amplitude and opposite polarity. The display second terminal is held at the reference voltage.

REFERENCES:
patent: 3602795 (1971-08-01), Gunn
patent: 4063234 (1977-12-01), Arn et al.
patent: 4109180 (1978-08-01), Ogle et al.
patent: 4201039 (1980-05-01), Marion
patent: 4595861 (1986-06-01), Simopoulos et al.
TMS 3450NL LED Duplex Digital Radio Clock Integrated Circuit, pp. 143-156, date unknown.

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