# US 2011/0080103 A1 · Method and apparatus for power driving > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2011/0080103 A1 - Document ID: US20110080103A1 - Status: Published application - Kind: A1 - Application number: 12/884,255 - Filed: 2010-09-17 - Published: 2011-04-07 - Earliest claimed: 2009-10-07 - Assignees: Marvell World Trade Ltd. - Inventors: Daniel REED; Jinho CHOI - Web page: https://patentgrep.com/patent/US20110080103A1 ## CPC - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H05B 45/385: using flyback topology - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - 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 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. ## Claims ### Claim 1 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; and a controller 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. ### Claim 2 (depends on 1) The power circuit of claim 1, wherein the converter further comprises: a transformer having a primary winding on a receiving path and a secondary winding on a delivering path; and a switch configured to switch on the receiving path to receive and store the electric energy and to switch off the receiving path to allow the delivering path to deliver the stored electric energy to the load; and the controller configured to control a turn-on time of the switch based on the first feedback signal and the second feedback signal. ### Claim 3 (depends on 2) The power circuit of claim 2, wherein the voltage feedback module further comprises: a voltage divider configured to generate the first feedback signal by dividing the voltage of the delivered electric energy on the delivering path. ### Claim 4 (depends on 3) The power circuit of claim 3, wherein the current feedback module further comprises: a sensing module configured to generate the second feed back signal as a function of a load current. ### Claim 5 (depends on 4) The power circuit of claim 4, wherein the sensing module comprises: a resistor coupled with the load in series. ### Claim 6 (depends on 5) The power circuit of claim 5, wherein the sensing module further comprises: a scaling circuit configured to scale a voltage drop on the resistor. ### Claim 7 (depends on 4) The power circuit of claim 4, wherein the controller is configured to reduce the turn-on time when a dominant feedback signal of the first feedback signal and the second feed back signal is larger than a limit. ### Claim 8 (depends on 7) The power circuit of claim 7, wherein the controller further 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 dominant feedback signal. ### Claim 9 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; and a controller 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. ### Claim 10 (depends on 9) The LED lighting device of claim 9, wherein the converter further comprises: a transformer having a primary winding on a receiving path and a secondary winding on a delivering path; a switch configured to switch on the receiving path to receive and store the electric energy and to switch off the receiving path to allow the delivering path to deliver the stored electric energy to the LED array; and the controller configured to control a turn-on time of the switch based on a dominant feedback signal of the first feedback signal and the second feedback signal. ### Claim 11 (depends on 10) The LED lighting device claim 10, wherein the voltage feedback module further comprises: a voltage divider configured to generate the first feedback signal by dividing the voltage of the delivered electric energy. ### Claim 12 (depends on 11) The LED lighting device of claim 11, wherein the current feedback module further comprises: a sensing module configured to generate the second feed back signal as a function of the current of the delivered electric energy. ### Claim 13 (depends on 12) The LED lighting device of claim 12, wherein the sensing module comprises: a resistor coupled with the LED array in series. ### Claim 14 (depends on 13) The LED lighting device of claim 13, wherein the sensing module further comprises: a scaling circuit configured to scale a voltage drop on the resistor. ### Claim 15 (depends on 12) The LED lighting device of claim 12, wherein the controller is configured to reduce the turn-on time when the dominant feedback signal of the first feedback signal and the second feed back signal is larger than a threshold. ### Claim 16 (depends on 15) The LED lighting device of claim 15, wherein the controller further 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 dominant feedback signal. ### Claim 17 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; and controlling the converter to receive and deliver the electric energy based on the first feedback signal and the second feedback signal. ### Claim 18 (depends on 17) The method of claim 17, wherein controlling the converter to receive and deliver the electric energy based on the first feedback signal and the second feedback signal, further comprises: selecting a dominant feedback signal of the first feedback signal and the second feedback signal; and controlling a turn-on time of a switch that couples a receiving path to receive electric energy and to store the received electric energy in a transformer based on the dominant feedback signal, the transformer having a primary winding on the receiving path and a secondary winding on a delivering path. ### Claim 19 (depends on 18) The method of claim 18, wherein generating the first feedback signal based on the voltage of electric energy delivered from the converter for driving the LED array further comprises: dividing a voltage on the delivering path. ### Claim 20 (depends on 18) The method of claim 18, wherein generating the second feedback signal based on the current of the electric energy delivered to the LED array, further comprises: sensing a voltage drop on a resistor that is coupled with the LED array in series.