Power distribution
AssigneeGreengage Lighting Ltd
InventorPhilip John Rimmer
Life of this patent
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Abstract
Several aspects of power distribution systems are described. One aspect relates to apparatus for providing a direct current to a load comprising one or more light emitting diodes. The apparatus comprises: a rectifier operatively connectable to a secondary winding of a transformer whose primary winding is for carrying a high-frequency alternating current; a first capacitor operatively connectable to the secondary winding; and a second capacitor operatively connectable, at least partly via the rectifier, to the secondary winding. The first and second capacitors together provide a reactance referred to the primary winding which substantially compensates for the reactance of the primary winding.
Claims19
Apparatus for providing a direct current to a load, at first and second main outputs, the apparatus comprising:
- a synchronous rectifier operatively connectable to a secondary winding of a transformer whose primary winding is for carrying high-frequency alternating current;
- the synchronous rectifier having first and second outputs;
- wherein the synchronous rectifier comprises first and second switches and a control circuit comprising:
- a further secondary winding of the transformer, a control port configured to control the first and second switches of the synchronous rectifier and thereby to turn the synchronous rectifier on and off, and a subcircuitry configured to provide a voltage to the control port;
- wherein the first and second rectifier outputs are directly connected to the first and second main outputs respectively:
- wherein the subcircuitry is connected to the first and second main outputs.
A power modifier comprising:
- first and second inputs and first and second outputs;
- a first current path including a winding which forms the primary winding of a transformer connecting the first input to the first output;
- and
- a second current path connecting the second input to the second output;
- a third current path connecting the first current path to the second current path at a point intermediate to the primary winding and the first output, the third current path including first and second switches in series,
- wherein the power modifier is configured to periodically close the first and second switches thus connecting the first and second current paths, thereby periodically interrupting the second current and reducing an average thereof.
Dependencies are inferred from the claim text.