# US 11,308,871 B2 · OLED drive power supply and OLED television

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- Number: US 11,308,871 B2
- Document ID: US11308871B2
- Status: Granted
- Kind: B2
- Application number: 17/058,323
- Filed: 2019-06-28
- Published: 2021-07-08
- Granted: 2022-04-19
- Earliest claimed: 2018-09-07
- Assignees: Shenzhen Skyworth-Rgb Electronic Co., Ltd.
- Applicants: Shenzhen Skyworth-Rgb Electronic Co., Ltd
- Inventors: Shengping Cai; Zongwang Wei; Jianhua Zhou; Zhenyu Guo; Qifeng Dai
- Web page: https://patentgrep.com/patent/US11308871B2

## CPC

- G09G 3/3208: organic, e.g. using organic light-emitting diodes [OLED]
- H05B 45/60: Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
- 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)}
- H02M 1/4208: {Arrangements for improving power factor of AC input}
- H02M 1/4225: {using a non-isolated boost converter}
- H02M 3/015: {with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit}
- H02M 3/285: {Single converters with a plurality of output stages connected in parallel (parallel operation of a plurality of converters in DC distribution networks H02J1/10)}
- H05B 45/355: Power factor correction [PFC]; Reactive power compensation
- H05B 45/382: with galvanic isolation between input and output
- H05B 45/39: Circuits containing inverter bridges
- G09G 2330/02: Details of power systems and of start or stop of display operation
- G09G 2330/026: Arrangements or methods related to booting a display
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- 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)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

An OLED drive power supply includes a power supply board connected to a main board and OLED screen, the power supply board includes a power supply circuit, first conversion module, second conversion module and switch; after powering on, the power supply circuit starts the first conversion module to output high-voltage DC to second conversion module, output first voltage and second voltage to power main board, switch converts first voltage to first enabling voltage to power OLED screen; after preset time, main board outputs second enabling signal to power supply circuit, to control second conversion module to start and output second enabling voltage to power and light OLED screen, first conversion module comprises bridgeless PFC circuit and auxiliary path LLC control circuit integrated into same semiconductor chip encapsulation, and omitting specific standby circuit, circuit structure is simplified, area of power supply board is reduced, and production cost is reduced.

## Claims

### Claim 1

An OLED drive power supply, comprising: a power supply board connected with a mainboard and an OLED screen, wherein the power supply board comprises a power supply circuit, a first conversion module, a second conversion module and a switch; after powering on, the power supply circuit starts the first conversion module according to an on-off signal output from the mainboard, the first conversion module outputs a high-voltage direct current to the second conversion module, the first conversion module outputs a first voltage and a second voltage to supply power to the mainboard, and the switch converts the first voltage into a first enabling voltage before outputting to the OLED screen for power, according to a first enabling signal output from the mainboard; after a preset time, the mainboard outputs a second enabling signal to the power supply circuit, the power supply circuit controls the second conversion module to start according to the second enabling signal, the second conversion module converts the high-voltage direct current into a second enabling voltage to supply power to and light up the OLED screen; the first conversion module comprises a bridgeless PFC circuit and an auxiliary path LLC control circuit integrated in a same semiconductor chip package, the bridgeless PFC circuit starts and outputs a high-voltage direct current to the auxiliary path LLC control circuit, and the auxiliary path LLC control circuit converts the high-voltage direct current into the first voltage and the second voltage before outputting to the mainboard for power.

### Claim 2 (depends on 1)

The OLED drive power supply according to claim 1, wherein the power supply circuit comprises an on-off control circuit and an enabling switching circuit, the on-off control circuit outputs a first power to start the bridgeless PFC circuit according to the on-off signal output from the mainboard, and outputs a second power to the auxiliary path LLC control circuit for power, and outputs a third power to the enabling switching circuit for power according to the high-voltage direct current output from the bridgeless PFC circuit; the enabling switching circuit converts the third power into a fourth power before outputting to the second conversion module according to the second enabling signal output from the mainboard.

### Claim 3 (depends on 2)

The OLED drive power supply according to claim 2, wherein the auxiliary path LLC control circuit comprises an auxiliary path LLC controller and a first transformer, the auxiliary path LLC controller starts the first transformer according to the second power output from the on-off control circuit, and the first transformer converts the high-voltage direct current output from the bridgeless PFC circuit into the first voltage and the second voltage before outputting to the mainboard.

### Claim 4 (depends on 2)

The OLED drive power supply according to claim 2, wherein the second conversion module comprises a main LLC controller and a second transformer, the main path LLC controller starts the second transformer according to the fourth power output from the enabling switching circuit, and the second transformer converts the high-voltage direct current output from the bridgeless PFC circuit into the second enabling voltage to power the OLED screen.

### Claim 5 (depends on 2)

The OLED drive power supply according to claim 2, wherein the on-off control circuit comprises a first control sub-circuit and a second control sub-circuit, the first control sub-circuit outputs the first power to start the bridgeless PFC circuit according to the on-off signal output from the mainboard, and outputs the second power to the auxiliary path LLC control circuit, and the second control sub-circuit outputs the third power to the enabling switching circuit according to the high-voltage direct current output from the bridgeless PFC circuit.

### Claim 6 (depends on 5)

The OLED drive power supply according to claim 5, wherein the first control sub-circuit comprises a second diode, a first Zener diode, a second Zener diode, a second triode, a third triode, a fourth triode, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a second optical coupler; an anode of the second diode connects to the mainboard, a cathode of the second diode connects to one end of the twelfth resistor, one end of the fourth capacitor and a base of the second triode through the eleventh resistor, another end of the twelfth resistor, another end of the fourth capacitor and an emitter of the second triode are all grounded; a third pin of the second optical coupler connects to one end of the sixteenth resistor, an anode of the first Zener diode and a base of the third triode through the fifteenth resistor; a fourth pin of the second optical coupler connects to a collector of the third triode and the auxiliary path LLC control circuit; an emitter of the third triode connects to a collector of the fourth triode and one end of the eighteenth resistor; another end of the eighteenth resistor connects to one end of the seventeenth resistor, a base of the fourth triode and a cathode of the second Zener diode; another end of the sixteenth resistor, an anode of the first Zener diode, another end of the fifth capacitor, another end of the seventeenth resistor, an anode of the second Zener diode and one end of the sixth capacitor are all grounded; an emitter of the fourth triode connects to the bridgeless PFC circuit, the second control sub-circuit and another end of the sixth capacitor.

### Claim 7 (depends on 6)

The OLED drive power supply according to claim 6, wherein the second triode, the third triode and the fourth triode are all NPN triodes.

### Claim 8 (depends on 5)

The OLED drive power supply according to claim 5, wherein the second control sub-circuit comprises a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a fifth triode, a third diode, a fourth diode, a fifth diode, a seventh capacitor, an eighth capacitor, a ninth capacitor and a second shunt reference source; an emitter of the fifth triode connects to the first control sub-circuit, further connects to one end of the twentieth resistor and a negative electrode of the second shunt reference source through the nineteenth resistor; a base of the fifth triode connects to a negative electrode of the second shunt reference source through the twentieth resistor; a collector of the fifth triode connects to an anode of the fifth diode, further connects to an anode of the third diode through the twenty-first resistor, a cathode of the fifth diode connects to the enabling switching circuit; a cathode of the third diode connects to a cathode of the fourth diode, a feedback pin of the second shunt reference source, and further getting grounded through the seventh capacitor; a positive electrode of the second shunt reference source is grounded; an anode of the fourth diode connects to one end of the twenty-third resistor, one end of the eighth capacitor, one end of the ninth capacitor and one end of the twenty-fourth resistor through the twenty-second resistor; another end of the twenty-third resistor, another end of the eighth capacitor and another end of the ninth capacitor are all grounded; another end of the twenty-fourth resistor connects sequentially to the twenty-fifth resistor, the twenty-sixth resistor and the twenty-seventh resistor in series, before connecting to the bridgeless PFC circuit.

### Claim 9 (depends on 8)

The OLED drive power supply according to claim 8, wherein the fifth triode is a PNP triode.

### Claim 10 (depends on 2)

The OLED drive power supply according to claim 2, wherein the enabling switching circuit comprises a sixth diode, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a tenth capacitor, a sixth triode, a seventh triode, a third Zener diode and a third optical coupler; an anode of the sixth diode connects to the mainboard, a cathode of the sixth diode connects to one end of the twenty-ninth resistor, one end of the tenth capacitor and a base of the sixth triode through the twenty-eighth resistor, another end of the twenty-ninth resistor, another end of the seventh resistor and an emitter of the sixth triode are all grounded; a collector of the sixth triode connects to a second pin of the third optical coupler, and a first pin of the third optical coupler connects to the on-off control circuit through the thirtieth resistor, a third pin of the third optical coupler connects to one end of the thirty-second resistor, a cathode of the third Zener diode and a base of the seventh triode through the thirty-first resistor, a fourth pin of the third optical coupler connects to the on-off control circuit and a collector of the seventh triode; and an emitter of the seventh triode connects to the second conversion module, while another end of the thirty-second resistor and an anode of the third Zener diode are both grounded.

### Claim 11 (depends on 10)

The OLED drive power supply according to claim 10, wherein the sixth triode and the seventh triode are both NPN triodes.

### Claim 12 (depends on 1)

The OLED drive power supply according to claim 1, wherein the auxiliary path LLC control circuit further comprises a standby step-down circuit, applied for controlling a magnitude of the first voltage and the second voltage output to the mainboard according to the on-off signal.

### Claim 13 (depends on 12)

The OLED drive power supply according to claim 12, wherein the standby step-down circuit comprises a first diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a first triode, a first shunt reference source and a first optical coupler; an anode of the first diode connects to the mainboard, a cathode of the first diode connects to one end of the second resistor, one end of the first capacitor and a base of the first triode through the first resistor; another end of the second resistor, another end of the first capacitor and an emitter of the first triode are all grounded; a collector of the first triode connects to one end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor, a feedback pin of the first shunt reference source, one end of the second capacitor, one end of the third capacitor and one end of the seventh resistor through the third resistor; another end of the fourth resistor connects to the mainboard, another end of the seventh resistor connects to the OLED screen and one end of the tenth resistor; another end of the fifth resistor, another end of the sixth resistor and a positive electrode of the first shunt reference source are all grounded; a negative electrode of the first shunt reference source connects to another end of the second capacitor, one end of the eighth resistor, one end of the ninth resistor and a second pin of the first optical coupler; another end of the eighth resistor connects to another end of the third capacitor; another end of the ninth resistor connects to another end of the tenth resistor and a first pin of the first optical coupler; a third pin of the first optical coupler is grounded, and a fourth pin of the first optical coupler connects to the mainboard.

### Claim 14 (depends on 13)

The OLED drive power supply according to claim 13, wherein, a model of the first optical coupler is BPC-817C.

### Claim 15 (depends on 1)

An OLED television, wherein comprising the OLED drive power supply according to claim 1.