LED LIGHTING DEVICE

PROBLEM TO BE SOLVED: To provide an LED lighting device which can prevent an excess electric current from flowing through an LED at the time of turning-on control for the LED.SOLUTION: A control circuit 17, during turning-on control for an LED 22, controls a lighting circuit 20 in response to a dete...

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Bibliographische Detailangaben
Hauptverfasser:	TAKASAKA KEITARO, HASEGAWA JUNJI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY SEMICONDUCTOR DEVICES
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an LED lighting device which can prevent an excess electric current from flowing through an LED at the time of turning-on control for the LED.SOLUTION: A control circuit 17, during turning-on control for an LED 22, controls a lighting circuit 20 in response to a detection signal from an electric current detection part 23 so that the LED 22 has prescribed brightness, while controlling an output voltage from a DC/DC converter 25 in response to a detection signal from a voltage detection part 24. And, at the time of turning-off control for the LED 22, the control circuit 17 controls the DC/DC converter 25 so that an applied voltage to the LED 22 or the output voltage from the DC-to-DC converter 25 is equal to the voltage at the time of the turning-on control for the LED 22.