Circuit for reducing current to light emitting diode of opticall

Details Circuit for reducing current to light emitting diode of opticall Circuit for reducing current to light emitting diode of opticall

1981-11-19

1983-10-25

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307254, 307299B, 307297, H03K 342, H03K 301

Patent

active

044121407

ABSTRACT:
A circuit is disclosed for reducing the average light emitting diode (LED) current required to latch an output triac. A ring oscillator coupled to a logic means provides a current pulse to the LED that triggers the optically coupled output triac early during each half sinewave. A biasing means for determining the current pulse duration is coupled between the ring oscillator and a.c. and d.c. input terminals.

REFERENCES:
patent: 3826930 (1974-07-01), Perry
patent: 3842259 (1974-10-01), Bruning
patent: 4323794 (1982-04-01), Hoehn
patent: 4344003 (1982-08-01), Harmon et al.

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