| 摘要 |
PURPOSE: An LED differential driving apparatus is provided to directly output differential power of a transformer to an LED after performing a rectifying process of a diode, thereby changing an LED driving current in a control part. CONSTITUTION: An LED part(800) comprises a plurality of LEDs(810,820). A control part(600) regularly controls a current provided to the LED part by receiving current feedback from the LED part. A rectifier part(200) rectifies an AC power source(100) A power efficiency correction part(900) controls the power efficiency of the rectified power source in the rectifier part according to a control signal of the control part. A switching part(400) switches output power of the rectifier part or power efficiency correction part according to the control signal of the control part. A transformer(500) converts power applied by the switching part according to a predetermined winding ratio. A synthesizing part(700) synthesizes current in both ends outputted from the transformer.
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