DC POWER SUPPLY DEVICE AND LED LAMP SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a DC power supply device which improves the circuit efficiency of a lighting circuit while controlling an LED stably.

SOLUTION: A DC power supply device includes: a DC power supply circuit 37 for boosting a power supply voltage from a power supply section 36; and a lighting circuit 38 supplying a load with a DC voltage in which an output voltage of the DC power supply circuit 37 is stepped down. The DC power supply device includes a control circuit 39 that controls the lighting circuit 38 in accordance with at least any one of the voltage and current of an LED 25, and in addition, that controls the DC power supply circuit 37 so that an output voltage is in a predetermined constant ratio relative to the voltage of the LED 25.

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