LED ILLUMINATOR AND LED LIGHTING SYSTEM

PROBLEM TO BE SOLVED: To provide an LED lighting apparatus which can adjust both the luminance and chromaticity of an LED by using the voltage or current supplied from a power supply via two electric wires.SOLUTION: The LED lighting apparatus includes: a first LED 60a and a second LED 60b differing...

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1. Verfasser:	TAKEDA RITSU
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an LED lighting apparatus which can adjust both the luminance and chromaticity of an LED by using the voltage or current supplied from a power supply via two electric wires.SOLUTION: The LED lighting apparatus includes: a first LED 60a and a second LED 60b differing in chromaticity; a switching unit which, while monitoring the length of the on-time of the power periodically supplied from two lengths of power feeder cable 20, switches the control modes of the first LED 60a and the second LED 60b between a first mode and a second mode on condition that a state in which the length of the on-time does not change continues for more than a threshold; a first control unit which determines the total amount of a mean current to be supplied to the first LED 60a and a mean current to be supplied to the second LED 60b according to the length of the on-time of power in the first mode; and second control means which determines a ratio of the mean current to be supplied to the first LED 60a to the mean current to be supplied to the second LED 60b according to the length of the on-time of power in the second mode.