Trailing-edge-phase-controlled light modulating circuit
OwnerYung Pun Chenginventor
Life of this patent
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Abstract
A single-pole (two-wire system) phase-controlled trailing-edge light-modulating circuit comprises a full-bridge rectification circuit, a power supply circuit, a light-modulating control circuit, and a voltage detection circuit. The light-modulating control circuit utilizes a CMOS chip and controls a field effect transistor by detecting specific voltage level to perform a trailing-edge phase control action for modulating light output of resistively and/or capacitively loaded light bulbs, e.g. LED light bulbs. The light-modulating control circuit connects to various lighting loads in series. In addition, the triggering circuit and the power supply circuit of are independent to avoid mutual restrictions to each other that might affect the adjustment of the maximum conduction phase angle.
Claims6
A single pole two-wire system phase control trailing edge light modulating circuit, characterized in that:
- a full-bridge rectification circuit;
- a power supply circuit;
- a light-modulating control circuit;
- a voltage detection circuit;
- and
- an active switch;
- wherein the full-bridge rectification circuit has one input terminal connected to a Live wire and another input terminal connected to a light-emitting load which is further connected to a neutral wire;
- the power supply circuit, the voltage detection circuit and the active switch are all connected in parallel between a positive output terminal and a negative output terminal of the full-bridge rectification circuit;
- three inputs of the light-modulating control circuit are connected to the negative output terminal of the full-bridge rectification circuit, an output terminal of the power supply circuit, and an output terminal of the voltage detection circuit, respectively;
- and an output terminal of the light-modulating control circuit is connected to an input terminal of the active switch.
Dependencies are inferred from the claim text.