Minebea Company, Limited

Hideharu Kanamitsu

Shinichi Suzuki

Yoshihiro Nakamura

Hiroshi Imada

Masataka Suzuki

A power-supply device includes a rectifying unit configured to rectify a phase-controlled AC voltage; a current limiting unit including a current limiting resistor, which limits an input current flowing from the rectifying unit at rise of a rectified voltage outputted from the rectifying unit; and an adjustment unit configured to cause the current limiting unit to limit the input current flowing from the rectifying unit until a predetermined time period has elapsed after an input of the AC voltage to the rectifying unit is started.

Power supply device and illumination device

Implemented are a switching power supply device and a light-emitting diode lighting device in which a variation in load current can be suppressed against a wide range of variation in AC voltage. The configuration of the switching power supply device and the light-emitting diode lighting device includes: a rectifier unit which rectifies AC input voltage and outputs pulsating-current voltage; a power converting unit which receives the pulsating-current voltage and supplies a predetermined load current to a load; a current detecting unit which detects the load current; a drive control unit which controls the power converting unit to regulate the load current to a constant level; and an input voltage detecting unit which detects a variation in the AC input voltage. The drive control unit controls the power converting unit depending on the variation in the AC input voltage detected by the input voltage detecting unit.

Growing community of inventors

Fukuroi, Japan

Hideharu Kanamitsu