Line or low voltage AC dimmer circuits with compensation for...

Details Line or low voltage AC dimmer circuits with compensation for... Line or low voltage AC dimmer circuits with compensation for...

2011-01-18

2011-01-18

Patel, Rajnikant B (Department: 2838)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S194000, C323S239000, C307S115000

Reexamination Certificate

active

07872428

ABSTRACT:
TRIAC or SCR based dimmer circuits with temperature compensation features to enable them to also function properly with outdoor line or low voltage AC light fixtures. The TRIAC's or the SCR's operate as static switches that are ideal for driving directly resistive loads, such as incandescent lamps, in line or low voltage AC dimmer circuits. The performance of this type of a circuit is very temperature dependent but it can be compensated for temperature related changes in the output or load RMS voltage by means of preventing variations in the trigger angle the circuit is running at. Temperature compensation is achieved by means of zener diodes being incorporated in the trigger circuit section of a TRIAC or an SCR based dimmer circuit.

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General Electric, “SCR Manual”, 5th Edition 1972, pp. 91-92, 189-200, 231-240, 419-423.

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