| 摘要 |
The present invention relates to a power supply apparatus for an LED light source, in which the power supply apparatus for supplying driving power to a high efficiency LED light source has a power factor compensating function that improves power efficiency. To accomplish this, the power supply apparatus for an LED light source according to the present invention comprises a power factor compensation control circuit which includes a step-up transformer, and which compensates for a power factor of commercial alternating current power and outputs power; a charging capacitor, in which the power output from the power factor compensation control circuit is stored; a resonant switching circuit which switches power output from the charging capacitor, and supplies the voltage level required by a load side; a rectifying circuit which rectifies the voltage output from the resonant switching circuit into a predetermined direct current voltage; an LED power switching circuit which switches the voltage rectified by the rectifying circuit, and supplies the switched voltage to the load side; a voltage control circuit which senses the voltage output from the rectifying circuit, and controls a switching frequency of the resonant switching circuit to control the size of the voltage output from the rectifying circuit; and an oscillation circuit which supplies oscillation output to the LED power switching circuit to switch the supplied output by a predetermined frequency.
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