| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a guide light lighting device 1 having a good power efficiency by preventing voltage variation of an LED from causing voltage variation of a control circuit 5. <P>SOLUTION: A first rectifying and smoothing circuit 2 rectifies an AC voltage of a commercial power supply and delivers a DC voltage. A first DC/DC converter 3 steps down a DC voltage delivered from the first rectifying and smoothing circuit 2 and delivers the DC voltage to an LED module 4 and a control circuit 5. The first DC/DC converter 3 comprises an output transformer 12, a second rectifying and smoothing circuit 13 and a third rectifying and smoothing circuit 14. The output transformer 12 has a first winding on the input side, and has a second winding and a third winding wound with a reverse polarity for the direction of the second winding on the output side. The second rectifying and smoothing circuit 13 delivers the output voltage from the second winding part to the LED module 4, and the third rectifying and smoothing circuit 14 delivers the output voltage from the third winding part to the control circuit 5. <P>COPYRIGHT: (C)2012,JPO&INPIT |
