# US 8,853,953 B2 · High efficiency LED power supply

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- Number: US 8,853,953 B2
- Document ID: US8853953B2
- Status: Granted
- Kind: B2
- Application number: 13/881,082
- Filed: 2011-10-24
- Published: 2013-08-22
- Granted: 2014-10-07
- Earliest claimed: 2010-10-23
- Assignees: Technelec Ltd
- Applicants: Charles Pollock; Helen Pollock
- Inventors: Charles Pollock; Helen Pollock
- Web page: https://patentgrep.com/patent/US8853953B2

## CPC

- H05B 45/44: with an active control inside an LED matrix
- H02J 4/00: Circuit arrangements for mains or distribution networks not specified as AC or DC; Circuit arrangements for mains or distribution networks combining AC and DC sections or sub-networks (arrangements using intermediate DC-AC-DC conversion H02J1/002; arrangements using high-voltage DC [HVDC] links H02J3/36)
- H05B 45/3725: Switched mode power supply [SMPS]
- H05B 45/375: using buck topology
- H05B 45/38: using boost topology
- H05B 45/385: using flyback topology
- H05B 45/39: Circuits containing inverter bridges
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY

## Abstract

There is an increasing need for simple and low cost power supplies to control loads such as battery chargers and LEDs. It is the object of this invention to provide an alternative method for the control of current in such loads with very high efficiency and to reduce the variation of load current with supply voltage. This invention is particularly relevant to LED power supplies or battery chargers and provides an electronic power supply for the control of an electrical load connected to an electrical source, the electrical load comprising a main load with at least one LED and an auxiliary load with at least one LED, the electronic power supply comprising a series compensation block connected in series with the main load and the voltage source, the series compensation block providing a voltage in opposition to the voltage source by directly controlling the power delivered to the auxiliary load and indirectly controlling the power converted in the main load.

## Claims

### Claim 1

An electronic power supply for the control of an electrical load, the electrical load comprising a main load containing at least one LED and an auxiliary load containing at least one LED, the electronic power supply comprising a series compensation block connected in series with the main load and an electrical source, wherein the series compensation block develops a voltage in opposition to the electrical source while controlling the power delivered to the auxiliary load.

### Claim 2 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block directly controls the power delivered to the auxiliary load and indirectly controls the power converted in the main load.

### Claim 3 (depends on 1)

An electronic power supply according to claim 1 wherein the electrical source is a voltage source.

### Claim 4 (depends on 1)

An electronic power supply according to claim 1 wherein the main load contains an LED string with two or more LEDs connected in series.

### Claim 5 (depends on 1)

An electronic power supply according to claim 1 wherein the auxiliary load contains an LED string with two or more LEDs connected in series.

### Claim 6 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains an LCL series-parallel resonant circuit.

### Claim 7 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains a step down dc to dc converter.

### Claim 8 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains a step up dc to dc converter.

### Claim 9 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains a step up-down dc to dc converter.

### Claim 10 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains a dc to dc converter without magnetic isolation.

### Claim 11 (depends on 1)

An electronic power supply according to claim 1 wherein the series compensation block contains a dc to dc converter with magnetic isolation.

### Claim 12

An electronic power supply for the control of an electrical load, the electrical load comprising a main load and an auxiliary load, at least one of the main load or the auxiliary load containing one or more batteries, the electronic power supply comprising a series compensation block connected in series with the main load and an electrical source, wherein the series compensation block provides-develops a voltage in opposition to the electrical source while controlling the power delivered to the auxiliary load.