Triac-based, low voltage AC dimmer

Details Triac-based, low voltage AC dimmer Triac-based, low voltage AC dimmer

2007-02-20

2007-02-20

Tran, Thuy Vinh (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

C315S299000, C315S362000

Reexamination Certificate

active

11043298

ABSTRACT:
A two-wire triac-based low voltage AC dimmer adapted for configuration in series with a typically incandescent lighting load. An external step-down transformer provides a source of low AC voltage, and a separate, electrically isoated loop circuit utilizing a step-up transformer converts a portion of the low AC voltage into a corresponding high AC voltage used to trigger the gate of a triac. An on/off arrangement that serves to lock the triac in its blocking may optionally be provided. A shunting resistor connected across the triac serves to dissipate static charge buildup that may otherwise falsely trigger the triac to its on state. A phi filter provides a smoother and more regulated triggering pulse to the triac, thereby minimizing or eliminating flickering and undesirable extinguishing of the incandescent lighting load at low brightness settings.

REFERENCES:
patent: 3763396 (1973-10-01), Shilling
patent: 3821634 (1974-06-01), Sabolic
patent: 4271386 (1981-06-01), Lee
patent: 4323835 (1982-04-01), Lee
patent: 4891562 (1990-01-01), Nuckolls et al.
patent: 2003/0161164 (2003-08-01), Shannon et al.

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