# US 10,504,475 B2 · Power supply device and display device including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,475 B2 - Document ID: US10504475B2 - Status: Granted - Kind: B2 - Application number: 15/495,057 - Filed: 2017-04-24 - Published: 2017-10-26 - Granted: 2019-12-10 - Earliest claimed: 2016-04-25 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Dae-sik Lee; Jongjae Lee; Sujin Kim; Yanguk Nam - Web page: https://patentgrep.com/patent/US10504475B2 ## CPC - G09G 3/3666: {with the matrix divided into sections} - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - G09G 3/3677: {suitable for active matrices only} - G09G 3/3688: {suitable for active matrices only} - H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 3/1584: {with a plurality of power processing stages connected in parallel} - G09G 2310/04: Partial updating of the display screen - G09G 2310/061: for resetting or blanking - G09G 2330/021: Power management, e.g. power saving - G09G 2330/023: using energy recovery or conservation - G09G 2330/025: Reduction of instantaneous peaks of current - H02M 1/0009: {Devices or circuits for detecting current in a converter} - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - 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) ## Abstract A power supply device includes n power supply circuits connected in parallel and a controller to control a number of the operating power supply. The controller includes n detectors, a comparator, and an on/off controller. The n detectors are respectively connected to the n power supply circuits. The n detectors receive feedback current from the number of operating power supply circuits. The comparator compares the feedback current with predetermined first and second reference currents and outputs first, second, and third state signals. The on/off controller determines the number of the operating power supply circuits according to a cumulative number of each of the first to third state signals during a predetermined window section, and controls a on/off state of the power supply circuits according to the determined number. ## Claims ### Claim 1 A power supply device, comprising: n power supply circuits connected in parallel, where n is a natural number of 2 or more; and a controller configured to control a number of operating power supply circuits among the n power supply circuits, wherein the controller includes: n detectors respectively connected to the n power supply circuits, the n detectors are configured to receive a feedback current from the number of operating power supply circuits among the n power supply circuits; a comparator configured to compare the feedback current with predetermined first and second reference currents and output first, second, and third state signals; and an on/off controller configured to determine the number of the operating power supply circuits according to a cumulative number of each of the first to third state signals during a predetermined window section and to control on/off of the power supply circuits according to the determined number, wherein: the window section includes a plurality of unit sections, each of the n detectors is configured to calculate an average current of each of the plurality of unit sections based on the feedback current, the comparator is configured to output the first state signal when the average current of each of the plurality of unit sections is greater than the first and second reference currents, the comparator is configured to output the second state signal when the average current of each of the plurality of unit sections is between the first and second reference currents, and the comparator is configured output the third state signal when the average current of each of the plurality of unit sections is less than the first and second reference currents. ### Claim 2 (depends on 1) The power supply device as claimed in claim 1, wherein: each of the n detectors is configured to receive the feedback current from a corresponding power supply circuit, during a high section of a switching signal, to control operation of the corresponding power supply circuit. ### Claim 3 (depends on 1) The power supply device as claimed in claim 1, wherein: when the number of the first state signals accumulated during the window section is largest, the number of the operating power supply circuits is increased; when the number of the second state signals accumulated during the window section is largest, the number of the operating power supply circuits is not changed; and when the number of the third state signals accumulated during the window section is largest, the number of the operating power supply circuits is decreased. ### Claim 4 (depends on 1) The power supply device as claimed in claim 1, wherein: when the cumulative numbers of at least two signals of the first to third state signals are equal, priority is to be given in an order of the first, second, and third state signals. ### Claim 5 (depends on 2) The power supply device as claimed in claim 2, wherein the controller includes an overcurrent protector to compare the feedback current to a predetermined third reference current and to turn off the operating power supply circuit when the feedback current is greater than the third reference current. ### Claim 6 (depends on 5) The power supply device as claimed in claim 5, wherein a magnitude of the third reference current is to be set according to the number of the operating power supply circuits. ### Claim 7 (depends on 5) The power supply device as claimed in claim 5, wherein an operation period of the overcurrent protector is shorter than the unit section. ### Claim 8 A display device, comprising: a display panel to display an image; a driver to drive the display panel; and a power supply to supply a driving voltage to the driver, wherein the power supply includes: n power supply circuits connected in parallel, where n is a natural number of 2 or more, and a controller configured to control a number of operating power supply circuits among the n power supply circuits, wherein the controller includes: n detectors respectively connected to the n power supply circuits, the n detectors are configured to receive a feedback current from the number of operating power supply circuits among the n power supply circuits; a comparator configured to compare the feedback current with predetermined first and second reference currents to output first, second, and third state signals; and an on/off controller configured to determine the number of the operating power supply circuits according to the cumulative number of each of the first to third state signals during a predetermined window section and to control an on/off of the power supply circuits according to the determined number, wherein: the window section includes a plurality of unit sections, each of the n detectors is configured to calculate an average current of each of the plurality of unit sections based on the feedback current, the comparator is configured to output the first state signal when the average current of each of the plurality of unit sections is greater than the first and second reference currents, the comparator is configured to output the second state signal when the average current of each of the plurality of unit sections is between the first and second reference currents, and the comparator is configured to output the third state signal when the average current of each of the plurality of unit sections is less than the first and second reference currents. ### Claim 9 (depends on 8) The display device as claimed in claim 8, wherein: each of the n detectors is configured to receive the feedback current from a corresponding power supply circuit, during a high section of a switching signal, to control operation of the corresponding power supply circuit. ### Claim 10 (depends on 9) The display device as claimed in claim 9, wherein each of the plurality of unit sections corresponds to one frame section where the display panel displays an image. ### Claim 11 (depends on 10) The display device as claimed in claim 10, wherein the driver includes: a data driver to supply a data signal to the display panel; a gate driver to supply a gate signal to the display panel; and a signal control unit is to generate a prediction signal to set the unit section based on a vertical start signal to start operation of the gate driver. ### Claim 12 (depends on 11) The display device as claimed in claim 11, wherein: the prediction signal includes an active section where the data driver is to operate and a blank section where the data driver is not to operate; and the on/off controller is to change an on/off state of the power supply circuits during the blank section. ### Claim 13 (depends on 8) The display device as claimed in claim 8, wherein: when a number of the first state signals accumulated during the window section is largest, the number of the operating power supply circuits is increased; when a number of the second state signals accumulated during the window section is largest, the number of the operating power supply circuits is not changed; and when a number of the third state signals accumulated during the window section is the largest, the number of the operating power supply circuits is decreased. ### Claim 14 (depends on 8) The display device as claimed in claim 8, wherein: when the cumulative numbers of at least two signals of the first to third state signals are equal, priority is to be given in an order of the first, second, and third state signals. ### Claim 15 (depends on 8) The display device as claimed in claim 8, wherein the controller includes an overcurrent protector to compare the feedback current with a predetermined third reference current and to turn off the operating power supply circuit when the feedback current is greater than the third reference current. ### Claim 16 (depends on 15) The display device as claimed in claim 15, wherein a magnitude of the third reference current is set according to the number of the operating power supply circuits.