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US 8,710,766 B2Granted
LED driving circuit, LED illumination appliance, LED illuminator, and LED illumination system
AssigneeSharp Kabushiki Kaisha
InventorsAtsushi Kanamori, Hirohisa Warita, Takeshi Murata
Life of this patent
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Abstract
Provided is an LED driving circuit (4), including: an impedance detecting section (7) for detecting an impedance value of a phase-control type dimmer (2); and an impedance adjusting section (6) for adjusting an impedance of the LED driving circuit (4) based on the impedance value detected by the impedance detecting section (7).
Claims12
An LED driving circuit connectable to a phase-control type dimmer, for inputting an alternating voltage to drive an LED, the LED driving circuit comprising:
- impedance detecting means for detecting an impedance value of the phase-control type dimmer;
- impedance adjusting means for adjusting an impedance of the LED driving circuit based on the impedance value detected by the impedance detecting means;
- and
- a current detecting means for detecting a current value of a current flowing through the impedance adjusting means;
- wherein the impedance detecting means outputs an adjustment signal for adjusting the impedance to the impedance adjusting means,
- the adjustment signal comprises a signal indicating the impedance value detected by the impedance detecting means;
- and
- the impedance adjusting means determines an adjusted impedance value based on the adjustment signal and the detected current value, detected by the current detecting means of the current flowing through the impedance adjusting means.
5 more elements
Dependencies are inferred from the claim text.