| 摘要 |
A circuit comprising an LED light source and a power supply arranged to power to the LED light source, said power supply comprising: an AC/DC converter arranged to convert an AC voltage into a DC voltage; a power converter comprising a transformer (123) and a power factor corrector, wherein the power factor corrector is arranged to control the transformer to generate a regulated power from the voltage provided by the AC/DC converter, and to supply the regulated power to the LED light source, the regulated power including a LED light source voltage and a LED light source current; a voltage sensor arranged to provide a sensed voltage indicative of a magnitude of the LED light source voltage, a current sensor arranged to provide a sensed current indicative of a magnitude of the LED light source current, and a feedback controller arranged to provide a feedback signal to the power converter based on the sensed voltage and sensed current; wherein the generation of the regulated power is controlled by the feedback signal. |
