# US 2014/0191678 A1 · Power converter for an led assembly and lighting application

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- Number: US 2014/0191678 A1
- Document ID: US20140191678A1
- Status: Published application
- Kind: A1
- Application number: 14/208,074
- Filed: 2014-03-13
- Published: 2014-07-10
- Earliest claimed: 2008-07-11
- Assignees: Eldolab Holding B.V.
- Applicants: EldoLAB Holding B.V.
- Inventors: Petrus Johannes Maria Welten
- Web page: https://patentgrep.com/patent/US20140191678A1

## CPC

- H05B 45/48: having LEDs organised in strings and incorporating parallel shunting devices
- H05B 45/375: using buck topology
- H05B 45/382: with galvanic isolation between input and output
- H05B 45/3725: Switched mode power supply [SMPS]
- H05B 45/39: Circuits containing inverter bridges
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A power converter for an LED assembly includes a switched mode power supply arranged to power the LED assembly, an AC/DC converter arranged to provide a DC supply voltage to the switched mode power supply, and a control unit arranged to receive an input signal representing a required load voltage for powering the LED assembly. The control unit is arranged to control the AC/DC converter based on the input signal.

## Claims

### Claim 1

A power converter for an LED assembly, the power converter comprising:
a switched mode power supply arranged to power the LED assembly;
an AC/DC converter arranged to provide a variable DC supply voltage to an input terminal of the switched mode power supply, the switched mode power supply being configured to convert the variable DC supply voltage to a required load voltage for powering the LED assembly; and
a control unit arranged to receive an input signal representing a required load voltage for powering the LED assembly, the control unit being arranged to control the AC/DC converter, thereby controlling the variable DC supply voltage, in accordance with the required load voltage.

### Claim 2 (depends on 1)

The power converter according to claim 1, wherein the required load voltage is derived from an output signal of a sensor of the power converter.

### Claim 3 (depends on 1)

The power converter according to claim 1, wherein the required load voltage is derived from an output signal of a sensor of the LED assembly.

### Claim 4 (depends on 2)

The power converter according to claim 2, wherein the input signal comprises the output signal of the sensor.

### Claim 5 (depends on 3)

The power converter according to claim 3, wherein the input signal comprises the output signal of the sensor.

### Claim 6 (depends on 1)

The power converter according to claim 1 wherein the control unit is arranged to control the AC/DC converter to provide the variable DC supply voltage at a level substantially matching or proportional to the required load voltage.

### Claim 7 (depends on 1)

A Lighting application comprising:
a power converter according to claim 1; and
an LED assembly arranged to, in use, being powered by the switched mode power supply of the power converter, the LED assembly further comprising a sensor configured to provide an output signal representative of the required load voltage.

### Claim 8 (depends on 7)

The lighting application according to claim 7 wherein the input signal comprises the output signal of the sensor.

### Claim 9 (depends on 7)

The lighting application according to claim 7, wherein the control unit is further arranged to control a current, in use, provided by the switched mode power supply to the LED assembly.

### Claim 10 (depends on 7)

The lighting application according to claim 7, wherein the LED assembly comprises a chain of multiple LED units in series, each LED unit being provided with a parallel switching element that is controlled by the control unit.