Switching circuit

Details Switching circuit Switching circuit

1984-06-11

1986-06-10

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307 38, 307157, 307241, H03K 1772, H03K 17969

Patent

active

045945152

ABSTRACT:
A switching circuit for controlling the lamp and fan speed on a common household vent hood includes first, second and third flip-flops, the outputs of which are optically coupled to first, second and third triacs. When each of the flip-flops have a specified output (high or low), its associated triac will be triggered so as to provide AC power to its respective load (lamp, low-speed fan and high-speed fan). Not only are each of the logic means optically isolated from the AC power being supplied to the load, but that portion of the circuit which generates DC voltages required by the remainder of the circuit is transformer coupled to a source of AC power. Thus, the user is afforded complete safety when using the switching circuit.

REFERENCES:
patent: 4287939 (1981-09-01), Pohl et al.
patent: 4361798 (1982-11-01), Tolmie, Jr.

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