Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1997-03-20
1998-12-29
Elms, Richard T.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
327457, H01H 4700
Patent
active
058545190
ABSTRACT:
The present invention teaches a dimmer which incorporates an alternating current (AC) trigger which exhibits asymmetrical electrical characteristics. This eliminates the undesirable snap on hysteresis effect associated with conventional dimmers utilizing symmetrical AC triggers such as diacs and silicon bilateral switches (SBS). One embodiment of the present invention utilizes a zener diode to create the asymmetry. During one polarity of the AC source, the breakover voltage of the trigger is increased, forcing the trigger to breakover at a time later in the AC cycle than it would otherwise have with a symmetric trigger. This compensates for charge dumping of the phase control capacitor into the gate of the triac which would otherwise cause the snap on hysteresis effect.
REFERENCES:
patent: 4006368 (1977-02-01), Ichikawa
patent: 4914327 (1990-04-01), Dekker
patent: 5619081 (1997-04-01), Gershen et al.
patent: 5668496 (1997-09-01), Rebordosa
Gershen Bernard J.
Krajci Edward J.
Lombardi Alfred J.
Shafir Yevgeny
Elms Richard T.
Leviton Manufacturing Co. Inc.
Sutton Paul J.
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