POWER SUPPLY DEVICE

To drive a constant-current drive light source load and a constant-voltage drive light source load.SOLUTION: A power supply device (10) comprises: a voltage converter (2) that drives a light source load (20) configured by at least one LED (201) by performing any one of a constant-current operation and a constant-voltage operation; a current detector (3) that detects an output current flowing from the voltage converter (2) to the light source load; a voltage detector (4) that detects an output voltage applied by the voltage converter (2) to the light source load (20); and a controller (5) that determines whether the light source load (20) is a constant-current drive load or a constant-voltage drive load on the basis of the detection current of the current detector (3) or the detection voltage of the voltage detector (4), and when it is determined that the light source load (20) is the constant-current drive load, makes the voltage converter (2) perform the constant current operation, and when it is determined that the light source load (20) is the constant-voltage drive load, makes the voltage converter (2) perform the constant voltage operation.SELECTED DRAWING: Figure 1 【課題】定電流駆動型光源負荷および定電圧駆動型光源負荷を駆動する。【解決手段】電源装置（１０）は、定電流動作および定電圧動作のいずれか一方を行うことによって少なくとも１つのＬＥＤ（２０１）で構成される光源負荷（２０）を駆動する電圧変換部（２）と、電圧変換部（２）から光源負荷に流す出力電流を検出する電流検出部（３）と、電圧変換部（２）が光源負荷（２０）に印加する出力電圧を検出する電圧検出部（４）と、電流検出部（３）の検出電流または電圧検出部（４）の検出電圧に基づいて、光源負荷（２０）が定電流駆動型負荷および定電圧駆動型負荷のいずれであるかを判定し、光源負荷（２０）が定電流駆動型負荷であると判定すると、電圧変換部（２）を定電流動作させる一方、光源負荷（２０）が定電圧駆動型負荷であると判定すると、電圧変換部（２）を定電圧動作させる制御部（５）と、を備える。【選択図】図１