Light-emitting diode drive device and light-emitting diode illumination control method

• Main Authors: MUGURUMA SHUJI, OGURA WATARU, WATANABE TERUO
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2012
• Subjects: 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

Disclosed is a light-emitting diode drive device that improves the utilization efficiency and power factor of LEDs while maintaining power supply efficiency. Said light-emitting diode drive device is provided with: a rectification circuit (2) that can be connected to an AC power supply and rectifies the AC voltage from said AC power supply into a pulsed voltage; a first LED block (11) comprising a plurality of light-emitting diodes, a second LED block (12) comprising a plurality of light-emitting diodes, and a third LED block (13) comprising a plurality of light-emitting diodes, connected sequentially in series to the output side of the rectification circuit (2); a first switching means that turns a first bypass path (BP1), which bypasses the second LED block (12), on or off on the basis of the amount of power supplied to the first LED block (11); and a second switching means that turns a second bypass path (BP2), which bypasses the third LED block (13), on or off on the basis of the amount of power supplied