| 摘要 |
A control circuit coupled to a power line controlled by a dimmer having a switching device includes, for example, an active power factor correction circuit receiving power from a bridge rectifier and storage capacitor and drawing an average continuous current when the switching device is "on." An LED power driving circuit receives a controlled current from the active power factor correction circuit and generates an output current received by at least one LED outputting visible light. A positive voltage feedback circuit senses a feedback voltage across the LED, through the LED power driving circuit, and sends the feedback voltage to the active power factor correction circuit. A pump back power circuit is electrically coupled to the LED power driving circuit and applies a bias voltage to an output of the bridge rectifier to power the active power factor correction circuit when the switching device is "off."
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