| 摘要 |
<p>PURPOSE: A buck boost type led power supply apparatus is provided to stably and efficiently control currents by obtaining a power factor more than 0.9 without a separate power factor control circuit. CONSTITUTION: A rectifier part(100) rectifies an AC power source and outputs DC power source through first and second outputs. A voltage detecting part(200) detects an output voltage from the rectifier part. A first light emitting circuit part(300) is connected to a first output node of the rectifier part. A second light emitting circuit part(400) is serially connected between the first light emitting circuit part and the second output node. A switch circuit part(500) controls currents flowing through the second light emitting circuit part. [Reference numerals] (200) Voltage detecting part; (600) Current control part; (AA) Modified example</p> |
