| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED drive device, constructed compactly at low cost, which controls an LED load with constant current, and an LED lighting apparatus. <P>SOLUTION: The LED drive device comprises a power conversion section of insulated type, composed of a transformer having a primary and a secondary winding and a switching element connected to the primary winding, which supplies electric power to an LED load via the primary winding; a feedback section, connected to the secondary winding, which includes a control information detection part for detecting control information and a voltage detection part for detecting information on the winding voltage of the secondary winding; and a control section which controls on/off of the switching element. The feedback section outputs a feedback signal having control information based on on/off control and the winding voltage information superposed one on top of another. The control section exerts on/off control based on the feedback signal. <P>COPYRIGHT: (C)2013,JPO&INPIT |
