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US 2009/0212721 A1Published application
Led drive circuit
OwnerYasuhiro MARUYAMAinventor
Life of this patent
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Abstract
An LED drive circuit includes a constant-current circuit that supplies a constant-current to an LED module to drive it; a thyristor; and a phase-angle control circuit which adjusts the ignition angle of the thyristor. The LED module, the constant-current circuit, and the thyristor are connected in series.
Claims9
An LED drive circuit comprising:
- a constant-current circuit supplying a constant current to an LED to drive the LED;
- a thyristor, triac, photothyristor, or phototriac;
- a phase-angle control circuit adjusting an ignition angle of the thyristor, triac, photothyristor, or phototriac,
- wherein the LED, the constant-current circuit, and the thyristor, triac, photothyristor, or phototriac are connected in series.
1 more element
Dependencies are inferred from the claim text.