US 8,525,434 B2Granted

Method and apparatus for power driving

AssigneeMarvell World Trade Ltd.

InventorsDaniel Reed, Jinho Choi

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Abstract

Aspects of the disclosure provide a power circuit to provide electric energy with control and protection for driving a load, such as a light emitting diode (LED) array, and the like. The power circuit includes a converter, a voltage feedback module, a current feedback module and a controller. The converter is configured to receive electric energy from an energy source and to deliver the electric energy for driving the load. The voltage feedback module is configured to generate a first feedback signal based on a voltage of the delivered electric energy. The current feedback module is configured to generate a second feedback signal based on a current of the delivered electric energy. The controller is configured to receive the first feedback signal and the second feedback signal, and to control the converter to receive and deliver the electric energy based on the first feedback signal and the second feedback signal.

Claims18

Dependent claims

A power circuit, comprising:

a converter configured to receive electric energy from an energy source, and to deliver the electric energy for driving a load;
a voltage feedback module configured to generate a first feedback signal based on a voltage of the delivered electric energy;
a current feedback module configured to generate a second feedback signal based on a current of the delivered electric energy;
a combining unit configured to take as inputs the first feedback signal and the second feedback signal, and to output a feedback signal corresponding to the first feedback signal or the second feedback signal having a higher positive voltage at an input of the combining unit, wherein the combining unit comprises:
a first diode having a first anode receiving the first feedback signal and a first cathode;
and
a second diode having a second anode receiving the second feedback signal and a second cathode that is coupled with the first cathode to output the feedback signal corresponding to the first feedback signal or the second feedback signal having a higher positive voltage at the input of the combining unit;
and
a controller configured to receive the feedback signal from the combining unit and to control the converter to receive and deliver the electric energy based on the feedback signal.

6 more elements

A light emitting diode (LED) lighting device, comprising:

an LED array configured to emit light in response to received electric energy;
a converter configured to receive electric energy from an energy source, and to deliver the electric energy for driving the LED array;
a voltage feedback module configured to generate a first feedback signal based on a voltage of the delivered electric energy;
a current feedback module configured to generate a second feedback signal based on a current of the delivered electric energy;
a combining unit configured to take as inputs the first feedback signal and the second feedback signal, and to output a feedback signal corresponding to the first feedback signal or the second feedback signal having a higher positive voltage at an input of the combining unit, wherein the combining unit comprises:
a first diode having a first anode receiving the first feedback signal and a first cathode;
and
a second diode having a second anode receiving the second feedback signal and a second cathode that is coupled with the first cathode to output the feedback signal having a larger positive voltage at the input of the combining unit;
and
a controller configured to receive the feedback signal from the combining unit and to control the converter to receive and deliver the electric energy based on the feedback signal.

7 more elements

A method for driving a light emitting diode (LED) array, comprising:

generating a first feedback signal based on a voltage of electric energy delivered from a converter for driving the LED array;
generating a second feedback signal based on a current of the electric energy delivered to the LED array;
combining the first feedback signal and the second feedback signal in a combining unit, wherein the combining unit comprises:
a first diode having a first anode receiving the first feedback signal and a first cathode;
and
a second diode having a second anode receiving the second feedback signal and a second cathode that is coupled with the first cathode to output the feedback signal having a higher positive voltage at an input of the combining unit;
outputting from the combining unit a feedback signal corresponding to the first feedback signal or the second feedback signal having the higher positive voltage at the input of the combining unit;
and
controlling the converter to receive and deliver the electric energy based on the feedback signal output from the combining unit.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/884,255Filed 17 Sep 2010 · us provisional application
Priority: 7 Oct 2009
Published: US 2011/0080103 A17 Apr 2011
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H02M 3/33507
Using semiconductor devices only: with automatic control of the output voltage or current, e.g. flyback converters
H05B 45/385
Switched mode power supply [SMPS]: using flyback topology
Y02B 20/30
Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps: semiconductor lamps, e.g. solid state lamps [SSL] light…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or