Patent ID: 8710758
Filing Date: 2014-04-29
Classification: H02M,H05B

Abstract:
1. A damper circuit for dampening resonance generated by an electromagnetic interference filter when a phase dimmer activates, the damper circuit comprising: a capacitor comprising a first terminal and a second terminal; and a bipolar junction transistor comprising a control terminal, a collector terminal, and an emitter terminal, wherein the bipolar junction transistor is operable to receive a control signal through the control terminal thereof to operate in the amplified area, and the collector terminal of the bipolar junction transistor is electrically connected to the second terminal of the capacitor, wherein the first terminal of the capacitor is operable to receive the resonance generated by the electromagnetic interference filter, and the bipolar junction transistor and the capacitor operate together to dampen the resonance generated by the electromagnetic interference filter when the bipolar junction transistor operates in the amplified area.