# US 12,120,790 B2 · Two-stage power supply architecture with flyback/LLC and buck converter for led display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,790 B2 - Document ID: US12120790B2 - Status: Granted - Kind: B2 - Application number: 17/514,909 - Filed: 2021-10-29 - Published: 2023-02-02 - Granted: 2024-10-15 - Earliest claimed: 2021-07-30 - Assignees: Texas Instruments Incorporated - Applicants: Texas Instruments Incorporated - Inventors: Yang Wu - Web page: https://patentgrep.com/patent/US12120790B2 ## CPC - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H05B 45/375: using buck topology - H02M 1/008: {Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators} - H02M 1/4208: {Arrangements for improving power factor of AC input} - H02M 3/01: {Resonant DC/DC converters} - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 3/1588: {comprising at least one synchronous rectifier element (H02M3/1582, H02M3/1584 take precedence)} - H02M 3/33569: {having several active switching elements (H02M3/3353 takes precedence)} - H05B 45/385: using flyback topology - 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 ## Abstract In an example, a system includes a single-output flyback/LLC converter adapted to be coupled to an alternating current (AC) power supply. The system also includes a buck regulator coupled to the single-output flyback/LLC converter. The system includes a first LED including an anode coupled to the single-output flyback/LLC converter and a cathode coupled to the buck regulator. The system also includes a second LED including an anode coupled to the single-output flyback/LLC converter and a cathode coupled to a ground terminal. ## Claims ### Claim 1 A system, comprising: a single-output voltage converter having a converter output and first and second converter inputs, wherein the first converter input is adapted to be coupled to an alternating current (AC) power supply, and the second converter input is coupled to a ground terminal; a buck regulator having first and second buck inputs and a buck output, wherein the first buck input is coupled to the converter output, and the second buck input is coupled to the second converter input; a first light emitting diode (LED) having a first anode and a first cathode, wherein the first anode is coupled to the converter output, and the first cathode is coupled to the buck output; and a second LED having a second anode and a second cathode, wherein the second anode is coupled to the converter output, and the second cathode is coupled to the second converter input and the ground terminal. ### Claim 2 (depends on 1) The system of claim 1, further comprising a third LED having a third anode and a third cathode, wherein the third anode is coupled to the converter output, and the third cathode is coupled to the second converter input and the ground terminal. ### Claim 3 (depends on 2) The system of claim 2, wherein the first LED is a red LED, the second LED is a green LED, and the third LED is a blue LED. ### Claim 4 (depends on 1) The system of claim 1, wherein the buck regulator is configured to provide a first voltage to the first LED, and the single-output voltage converter is configured to provide a second voltage to the second LED. ### Claim 5 (depends on 4) The system of claim 4, wherein the second voltage is greater than the first voltage. ### Claim 6 (depends on 1) The system of claim 1, wherein the buck regulator is configured to sink current from the first LED. ### Claim 7 (depends on 1) The system of claim 1, wherein the buck regulator is a synchronous buck regulator. ### Claim 8 A system, comprising: a single-output voltage converter having a converter output and first and second converter inputs, wherein the first converter input is adapted to be coupled to an alternating current (AC) power supply, and the second converter input is coupled to a ground terminal; a buck regulator having first and second buck inputs and a buck output, wherein the first buck input is coupled to the converter output, and the second buck input is coupled to the second converter input and the ground terminal; a first light emitting diode (LED) having a first anode and a first cathode, wherein the first anode is coupled to the buck output, and the first cathode is coupled to the ground terminal; and a second LED having a second anode and a second cathode, wherein the second anode is coupled to the converter output, and the second cathode is coupled to the second converter input and the ground terminal. ### Claim 9 (depends on 8) The system of claim 8, further comprising a third LED having a third anode and a third cathode, wherein the third anode is coupled to the converter output, the third cathode is coupled to the second converter input and the ground terminal, the first LED is a red LED, the second LED is a green LED, and the third LED is a blue LED. ### Claim 10 (depends on 8) The system of claim 8, wherein the buck regulator is configured to source current to the first LED. ### Claim 11 (depends on 8) The system of claim 8, wherein the buck regulator is a synchronous buck regulator. ### Claim 12 A system, comprising: a single-output voltage converter having a converter output and first and second converter inputs, wherein the first converter input is adapted to be coupled to an alternating current (AC) power supply, the second converter input is coupled to a ground terminal, and the single-output voltage converter is configured to provide a first voltage at the converter output; a buck regulator having first and second buck inputs and a buck output, wherein the first buck input is coupled to the converter output, the second buck input is coupled to the second converter input, and the buck regulator is configured to provide a second voltage at the buck output; a first load having first and second load terminals, wherein the first load terminal is coupled to the converter output, and the second load terminal is coupled to the second buck input and the ground terminal; and a second load having third and fourth load terminals, wherein the third load terminal is coupled to the converter output, and the fourth load terminal is coupled to the buck output. ### Claim 13 (depends on 12) The system of claim 12, wherein the first load is coupled between the converter output and the ground terminal, and the first load terminal is coupled to the third load terminal. ### Claim 14 (depends on 12) The system of claim 12, wherein the first load is coupled between the converter output and the ground terminal, and the second load is coupled between the converter output and the buck output. ### Claim 15 (depends on 12) The system of claim 12, wherein the first load and the second load are arrays of light emitting diodes (LEDs). ### Claim 16 (depends on 12) The system of claim 12, wherein the buck regulator is configured to sink current from the second load. ### Claim 17 (depends on 12) The system of claim 12, wherein the buck regulator is configured to source current to the second load. ### Claim 18 (depends on 12) The system of claim 12, wherein the first load is a blue or green light emitting diode (LED), and the second load is a red LED. ### Claim 19 (depends on 12) The system of claim 12, wherein the buck regulator is a synchronous buck regulator.