# US 8,569,976 B2 · Time division modulation with average current regulation for independent control of arrays of light-emitting diodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,569,976 B2 - Document ID: US8569976B2 - Status: Granted - Kind: B2 - Application number: 13/585,781 - Filed: 2012-08-14 - Published: 2012-12-06 - Granted: 2013-10-29 - Earliest claimed: 2006-11-21 - Assignees: Point Somee Limited Liability Company - Applicants: Anatoly Shteynberg; Harry Rodriguez - Inventors: Anatoly Shteynberg; Harry Rodriguez - Web page: https://patentgrep.com/patent/US8569976B2 ## CPC - H05B 45/38: using boost topology - H05B 45/22: using optical feedback - H05B 45/24: using electrical feedback from LEDs or from LED modules - H05B 45/46: having LEDs disposed in parallel lines - H05B 45/48: having LEDs organised in strings and incorporating parallel shunting devices - H05B 45/3725: Switched mode power supply [SMPS] - 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 Method and computer-readable medium embodiments provide for sourcing current to a series of light-emitting diodes in a plurality of series of light-emitting diodes. A method comprises generating a current, sequentially and separately switching the current to each of the series of light-emitting diodes in the plurality of series of light-emitting diodes for a corresponding period of time, and predicting an output voltage across a selected series of light-emitting diodes using a plurality of parameters stored in a memory. ## Claims ### Claim 1 A method of providing power to a series of light-emitting diodes in a plurality of series of light-emitting diodes, the method comprising: generating an input DC current having an average current; determining the average current of the input DC current based on a plurality of corresponding input DC currents through the plurality of series of light-emitting diodes; determining a total period for switching the input DC current to all of the series of light-emitting diodes in the plurality of series of light-emitting diodes; determining a corresponding period of time for switching the input DC current to a selected corresponding series of light-emitting diodes based on a ratio of the corresponding input DC current for the selected corresponding series of light-emitting diodes to the average current; and sequentially and separately switching the input DC current to each of the series of light-emitting diodes in the plurality of series of light-emitting diodes for the determined corresponding period of time. ### Claim 2 (depends on 1) The method of claim 1, further comprising: switching no current to all remaining series of light-emitting diodes while switching the input DC current to a selected series of light-emitting diodes in the plurality of series of light-emitting diodes. ### Claim 3 (depends on 1) The method of claim 1, wherein the average current of the input DC current is determined to be substantially equal to a sum of the plurality of corresponding input DC currents through the plurality of series of light-emitting diodes. ### Claim 4 (depends on 3) The method of claim 3, wherein the corresponding time period for switching the input DC current to a selected corresponding series of light-emitting diodes is determined to be substantially equal to a proportion of the total period determined according to the ratio of the corresponding input DC current for the selected corresponding series of light-emitting diodes to the average current. ### Claim 5 (depends on 1) The method of claim 1, further comprising: storing, as a look-up table, a plurality of parameters corresponding to the plurality of series of light-emitting diodes. ### Claim 6 (depends on 5) The method of claim 5, further comprising: predicting an output voltage across a selected series of light-emitting diodes in the plurality of series of light-emitting diodes based on the stored plurality of parameters. ### Claim 7 (depends on 6) The method of claim 6, further comprising: measuring a corresponding output voltage for each series of light-emitting diodes in the plurality of series of light-emitting diodes. ### Claim 8 (depends on 7) The method of claim 7, further comprising: updating the predicted output voltage across a selected series of light-emitting diodes in the plurality of series of light-emitting diodes based on the corresponding measured output voltage. ### Claim 9 (depends on 1) The method of claim 1, further comprising: determining an input voltage. ### Claim 10 (depends on 1) The method of claim 1, further comprising: determining a peak input DC current. ### Claim 11 (depends on 1) The method of claim 1, further comprising: determining a corresponding output voltage for each series of light-emitting diodes in the plurality of series of light-emitting diodes. ### Claim 12 (depends on 1) The method of claim 1, further comprising: measuring a corresponding current through each series of light-emitting diodes in the plurality of series of light-emitting diodes. ### Claim 13 (depends on 12) The method of claim 12, further comprising: determining a corresponding period of time for switching the input DC current to a selected series of light-emitting diodes based on a comparison of the measured corresponding current to a predetermined current for the selected series of light-emitting diodes. ### Claim 14 (depends on 1) The method of claim 1, further comprising: determining a corresponding period of time for switching the input DC current to a selected series of light-emitting diodes based on an integer multiple of a period of switching. ### Claim 15 (depends on 1) The method of claim 1, further comprising: switching the input DC current to a selected series of light-emitting diodes in the plurality of series of light-emitting diodes if the input DC current is substantially zero. ### Claim 16 (depends on 1) The method of claim 1, further comprising: in response to a first input, adjusting an output brightness of the plurality of series of light-emitting diodes by modifying each corresponding period of time of current switching to each of the series of light-emitting diodes. ### Claim 17 (depends on 1) The method of claim 1, further comprising: in response to a second input, adjusting an output color of the plurality of series of light-emitting diodes by modifying a corresponding period of time of current switching to at least one of the series of light-emitting diodes in the plurality of series of light-emitting diodes.