Sharp Kabushiki Kaisha Corporation

Hakko Corporation

Shogo Fukuda

Tomoyuki Ichiza

Toshimasa Ogawa

This LED lighting device makes a maximum current to minimum current flowing in an LED a target proportion regardless of LED driving circuit performance and without erroneous operation. An LED lighting device () is provided with: an LED circuit () that includes at least one LED (-); a bypass means () inserted in parallel with the LEDs (-); and an LED driving circuit () that supplies current by duty control to the LEDs (-) and the bypass means (). When a prescribed minimum current flows in the LED circuit (), the LED driving circuit () supplies current in which a portion of current flowing in the bypass means () is added to this minimum current and carries out control of the added current by a switching element (TR) connected in series to the LED circuit () and the bypass means ().

Growing community of inventors

Osaka, Japan

Shogo Fukuda