Pull chain switch circuit device capable of stepless control of

Details Pull chain switch circuit device capable of stepless control of Pull chain switch circuit device capable of stepless control of

1997-09-10

1999-05-04

Paladini, Albert W.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307130, 338198, 315209R, 315362, 200 5115, H01H 322

Patent

active

059006820

ABSTRACT:
A pull chain switch circuit device for a stepless control of brightness of lighting fixtures of a ceiling fan is composed of a central control unit, a voltage stabilizing and rectifying unit, a pull chain switch, a protective unit, a zero crossing loop, and a gate unit. The input end of the voltage stabilizing and rectifying unit is connected with an alternating current source, whereas the output end of the voltage stabilizing and rectifying unit is connected with the central control unit. The pull chain switch has one end connected with the output end of the voltage stabilizing and rectifying unit. The protective unit is connected with the alternating current source and the central control unit. The zero crossing loop is connected with the alternating current source and the central control unit for detecting a time point at which the alternating current source becomes 0V. The gate unit is capable of being activated by a trigger signal transmitted by the central control unit at such time when the pull chain switch is pulled. The stepless control of brightness of lighting fixtures of the ceiling fan is brought about by a persistent pulling of the pull chain switch.

REFERENCES:
patent: 3643052 (1972-02-01), Marshall
patent: 4937513 (1990-06-01), Hoemann et al.
patent: 5488273 (1996-01-01), Chang
patent: 5546067 (1996-08-01), Schmidt et al.

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