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US 2024/0162830 A1Published application
Direct drive leds using floating switches in 3-phase or single-phase rectifier circuit
AssigneeInvent10 Limited
InventorKam Wah SIU
Life of this patent
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Abstract
Embodiments of the invention provide a 3-phase rectifying circuit that may produce a DC voltage with much less ripple compared to a single-phase rectifying circuit. In one aspect, the circuit or switch of embodiments of the invention may provide a filtered DC voltage to drive a LED string formed by multiple LED units.
Claims14
A circuit for one or more light emitting diode (LED) units comprising:
- a single phase or a 3-phase alternating current (AC) voltage as a power source;
- a rectifier for converting the single phase or 3-phase AC voltage into a ripple DC voltage;
- an inductor for limiting a current in the circuit, wherein the inductor is configured to filter the ripple DC voltage;
- one or more switch connecting in parallel with the one or more LED units in the circuit;
- a controller for sensing a LED voltage and a LED current to compute a LED power;
- wherein the controller is configured to regulate a LED forward voltage as a function of a deviation from a nominal voltage value;
- and
- wherein the controller is configured to energize or de-energize the one or more switch to adjust the LED power back to the nominal voltage value.
5 more elements
A system for one or more light emitting diode (LED) units comprising:
- a single phase or a 3-phase alternating current (AC) voltage as a power source;
- a rectifier for converting the single phase or 3-phase AC voltage into a ripple DC voltage;
- an inductor for limiting a current in the circuit, wherein the inductor is configured to filter the ripple DC voltage;
- one or more switch connecting in parallel with the one or more LED units in the circuit;
- a controller for sensing a LED voltage and a LED current to compute a LED power;
- wherein the controller is configured to regulate a LED forward voltage as a function of a deviation from a nominal voltage value;
- and
- wherein the controller is configured to energize or de-energize the one or more switch to adjust the LED power back to the nominal voltage value.
5 more elements
Dependencies are inferred from the claim text.