Dimmer system and damper circuit thereof

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 emitter 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.

A dimming system, comprising:

• a phase dimmer for regulating a phase of an alternating current voltage to generate a modulated alternating current voltage;
• an electromagnetic interference filter electrically connected to the phase dimmer for filtering the electromagnetic interference signal generated by the phase dimmer;
• a converter electrically connected to the electromagnetic interference filter for transforming the modulated alternating current voltage into a modulated direct current voltage;
• a damper circuit electrically connected to the converter for dampening resonance generated by the electromagnetic interference filter when the phase dimmer activates;
• and
• a power converter electrically connected to the damper circuit for transforming the modulated direct current voltage;
• wherein the damper circuit comprises:
• 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.

A dimming system, comprising:

• a phase dimmer for regulating a phase of an alternating current voltage to generate a modulated alternating current voltage;
• an electromagnetic interference filter electrically connected to the phase dimmer for filtering the electromagnetic interference signal generated by the phase dimmer;
• a converter electrically connected to the electromagnetic interference filter for transforming the modulated alternating current voltage into a modulated direct current voltage;
• a damper circuit electrically connected to the converter for dampening resonance generated by the electromagnetic interference filter when the phase dimmer activates;
• and
• a power converter electrically connected to the damper circuit for transforming the modulated direct current voltage;
• wherein the damper circuit comprises:
• 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 emitter 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.