WO2023005146A1 - 一种mini led驱动电源及mini led电视 - Google Patents

一种mini led驱动电源及mini led电视 Download PDF

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Publication number
WO2023005146A1
WO2023005146A1 PCT/CN2021/143153 CN2021143153W WO2023005146A1 WO 2023005146 A1 WO2023005146 A1 WO 2023005146A1 CN 2021143153 W CN2021143153 W CN 2021143153W WO 2023005146 A1 WO2023005146 A1 WO 2023005146A1
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WIPO (PCT)
Prior art keywords
resistor
capacitor
power supply
voltage
mini led
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PCT/CN2021/143153
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English (en)
French (fr)
Inventor
蔡胜平
周建华
陈赞添
魏豪
袁选
Original Assignee
深圳创维－Rgb电子有限公司
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Application filed by 深圳创维－Rgb电子有限公司 filed Critical 深圳创维－Rgb电子有限公司
Priority to EP21951718.2A priority Critical patent/EP4195194A4/en
Priority to US18/044,447 priority patent/US20230343273A1/en
Publication of WO2023005146A1 publication Critical patent/WO2023005146A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges

Definitions

  • This application relates to the field of power supply technology, in particular to a MINI LED driving power supply and a MINI LED TV.
  • Mini-LED TVs use a light source that is smaller than traditional LEDs.
  • Mini LEDs are about 200 microns wide, one-fifth the size of standard LEDs used in LCD panels. Since they are small enough, they can be more distributed on the entire screen. When there are enough LED backlights in a screen, the brightness control and color gradation of the screen can be controlled well enough, so the image quality provided will be better.
  • the power supply solutions used are also different.
  • the commonly used outputs are +12V and +28V.
  • the conversion output of +12V and +28V voltage on the traditional power board shares a transformer, as shown in Figure 1 and Figure 2, the +12V voltage and +28V voltage are bound to interact with each other during high-power output, resulting in unpredictable As a result, the development and debugging cycle increases.
  • the purpose of this application is to provide a MINI LED drive power supply and a MINI LED TV, which can effectively solve the problem of mutual influence between different voltages during high-power output.
  • a MINI LED drive power supply including a power board connected to the main board and the MINI LED screen, the power board includes a first conversion module and a second conversion module;
  • the first conversion module is connected to the main board and the second conversion module, and is used to output a power supply voltage to supply power to the main board after the power is turned on, and output the first voltage and The second voltage supplies power to the motherboard, and outputs the first power supply and high-voltage direct current to the second conversion module;
  • the second conversion module is connected to the MIN LED screen, and is used to convert the high-voltage direct current into a third voltage to the MINI LED screen according to the enable signal output by the main board and the first power supply, and turn on MINI LED screen.
  • the first conversion module includes a standby control unit and a first conversion unit
  • the first conversion unit is connected to the main board, and is used to output a power supply voltage to supply power to the main board after the power is turned on;
  • the standby control unit is respectively connected to the main board and the first conversion unit, and is used to control the first conversion unit to start according to the power-on/off signal output by the main board;
  • the first conversion unit is further configured to output the first voltage and the second voltage to supply power to the main board after startup, and output the high-voltage direct current and the first power supply to the second conversion module.
  • the second conversion module includes an enabling switching unit and a second conversion unit;
  • the enable switching unit is connected to the first conversion unit and the second conversion unit respectively, and is used to convert the first power supply into a second power supply and output it to the second power supply according to the enable signal output by the main board.
  • the second conversion unit is connected to the MINI LED screen, and is used to convert the high-voltage direct current into the third voltage to supply power to the MINI LED screen according to the second power supply.
  • the standby control unit includes a standby switching subunit and a step-down subunit;
  • the standby switching sub-unit is respectively connected to the main board and the first conversion unit, and is used to control the first conversion unit to start according to the power-on/off signal output by the main board;
  • the step-down sub-units are respectively connected to the main board and the first conversion unit, and are used to provide a feedback signal for the first conversion unit according to the power-on/off signal.
  • the first conversion unit includes a conversion subunit and a power supply subunit;
  • the conversion sub-units are respectively connected with the power supply unit and the main board, and are used to output a power supply voltage to supply power to the main board after the power supply is turned on, and to output the first voltage and the second voltage to supply power to the main board after startup, and outputting the high-voltage direct current to the second conversion unit;
  • the power supply subunit is configured to output the first power supply to the enabling switching unit according to the control signal output by the converting subunit.
  • the second conversion unit includes a main circuit LLC circuit and a main circuit LLC transformer;
  • the main LLC circuit is respectively connected to the enabling switching unit and the main LLC transformer, and is used to start the main LLC transformer according to the second power supply;
  • the main LLC transformer is connected to the MINI LED screen, and is used to convert the high-voltage direct current into a third voltage and output it to the MINI LED screen.
  • the enable switching unit includes a first diode, a second diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth Resistor, first triode, second triode, first capacitor, second capacitor, first Zener diode and first photocoupler;
  • the anode of the first diode is connected to the enable signal input terminal, the anode of the second diode is connected to the LED_ON signal terminal, and the cathode of the first diode is connected to the input terminal of the second diode.
  • the negative electrodes are all connected to one end of the first resistor, and the other end of the first resistor, one end of the second resistor and one end of the first capacitor are all connected to the base of the first triode, The emitter of the first triode, the other end of the first capacitor and the other end of the second resistor are all grounded, and the collector of the first triode and the first photocoupler
  • the second pin is connected, the first pin of the first photocoupler is connected to the first voltage input terminal through the third resistor, the third pin of the first photocoupler is connected to one end of the fourth resistor, The other end of the fourth resistor is connected to one end of the fifth resistor, the base of the second triode and the cathode of the first Zener diode, and the anode of the first Zener diode is connected to the first Zener diode.
  • the other end of the fifth resistor is grounded, the emitter of the first triode, one end of the second capacitor, and one end of the sixth resistor are all connected to the output end of the second power supply, and the second capacitor The other end is grounded, and the collector of the second triode, the fourth pin of the first photocoupler and the other end of the sixth resistor are all connected to the first power input end.
  • the standby switching subunit includes a third diode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a third triode, a third capacitor and a second Photocoupler;
  • the anode of the third diode is connected to the main board, the cathode of the third diode is connected to one end of the seventh resistor, the other end of the seventh resistor and one end of the eighth resistor and one end of the third capacitor are connected to the base of the third transistor, the emitter of the third transistor, the other end of the third capacitor and the other end of the eighth resistor are all grounded; the collector of the third triode is connected to the second pin of the second photocoupler, and the first pin of the second photocoupler is connected to the first voltage input terminal through the ninth resistor connection, the third pin of the second photocoupler is connected to the Auto_stb signal terminal, and the fourth pin of the second photocoupler is connected to the DVCC_1 signal terminal.
  • the step-down subunit includes a fourth diode, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fourth triode, a thirteenth resistor, a fourteenth resistor Resistor, fifteenth resistor, sixteenth resistor, seventeenth resistor, eighteenth resistor, nineteenth resistor, twentieth resistor, twenty-first resistor, twenty-second resistor, twenty-third resistor,
  • the anode of the fourth diode is connected to the main board, the cathode of the fourth diode is connected to one end of the eleventh resistor, the other end of the eleventh resistor, the twelfth One end of the resistor and one end of the fourth capacitor are connected to the base of the fourth transistor, the emitter of the fourth transistor, the other end of the fourth capacitor and the twelfth transistor
  • the other ends of the resistors are both grounded
  • the collector of the fourth triode is connected to one end of the thirteenth resistor, the other end of the thirteenth resistor is connected to one end of the fourteenth resistor, and the The other end of the fourteenth resistor is connected to one end of the fifteenth resistor, one end of the seventh capacitor, one end of the sixth capacitor, one end of the fifth capacitor, and one end of the eighteenth resistor , one end of the seventeenth resistor, one end of the eighth capacitor and one end of the twentieth resistor are all connected to one end of the fifth capacitor, the first pin of the voltage
  • a MINI LED television including the above-mentioned MINI LED driving power supply.
  • the application provides a MINI LED driving power supply and a MINI LED TV.
  • the MINI LED driving power supply includes a power board connected to the main board and the MINI LED screen, and the power board includes a first conversion module and a second conversion module.
  • a conversion module, the first conversion module is connected to the main board and the second conversion module, and is used to output a power supply voltage to supply power to the main board after the power is turned on, and to output the first A voltage and a second voltage supply power to the main board, and output the first power supply and high-voltage direct current to the second conversion module;
  • the second conversion module is connected to the MIN LED screen for output according to the main board
  • the enable signal and the first power supply convert the high-voltage direct current into a third voltage to the MINI LED screen, light up the MINI LED screen, and convert the first voltage and the third voltage separately, so that the third voltage Whether the output of the output is working normally will not affect the working state of the other line, thus avoiding the interference problem between the lines.
  • Fig. 1 and Fig. 2 are the structural schematic diagrams of existing driving power supply
  • FIG. 3 is a schematic diagram of the architecture of the MINI LED drive power supply provided by this application.
  • Fig. 4 is the circuit diagram of enabling the switching unit in the MINI LED driving power supply provided by the present application.
  • Fig. 5 is the circuit diagram of the standby switching subunit in the MINI LED drive power supply provided by the present application.
  • FIG. 6 and Figure 7 are circuit diagrams of the step-down subunit in the MINI LED drive power supply provided by the present application.
  • FIG. 8 is a circuit diagram of the power supply unit in the MINI LED drive power provided by the present application.
  • FIG. 9 is a schematic diagram of the switching sequence of the MINI LED drive power provided by this application.
  • This application provides a MINI LED drive power supply and a MINI LED TV, which can effectively solve the problem of mutual influence between different voltages during high-power output.
  • the MINI LED drive power provided by this application can also be applied to display-related power drives such as OLEDs, LED monitors, audio-visual education, and rear-projection plasmas.
  • a kind of MINI LED drive power comprises the power board that is connected with mainboard 10 and MINI LED screen 20, and described power board includes first conversion module 31 and second conversion module 32;
  • the conversion module 31 is connected with the main board 10 and the second conversion module 32, and is used to output a power supply voltage to supply power to the main board 10 after the power supply is turned on, and according to the power-on/off signal output by the main board 10 (this embodiment ON_OFF in this embodiment) outputs the first voltage (+12V in this embodiment) and the second voltage (+20V in this embodiment) to supply power to the motherboard 10, and outputs the first power supply and high voltage direct current to the second Conversion module 32;
  • the second conversion module 32 is connected with the MIN LED screen, and is used to convert the high-voltage direct current into a third voltage according to the enabling signal output by the mainboard 10 and the first power supply (this implementation In the example, it is +28V) to the MINI LED screen 20 to light the MINI LED screen 20; this application converts the first voltage and the
  • the first conversion module 31 includes a standby control unit (not shown in the figure) and a first conversion unit (not shown in the figure), the first conversion unit is connected with the main board 10 for After the power is turned on, the output power supply voltage (10V in this embodiment) is used to supply power to the main board 10, and the standby control unit is connected to the main board 10 and the first conversion unit respectively, and is used to switch according to the output of the main board 10.
  • the standby control unit is connected to the main board 10 and the first conversion unit respectively, and is used to switch according to the output of the main board 10.
  • the first conversion unit is controlled by a machine signal to start, and the first conversion unit is also used to output the first voltage and the second voltage to supply power to the motherboard 10 after startup, and output the high-voltage direct current and the first power supply to the
  • the second conversion module 32 is described; specifically, after the AC power is connected, the power supply board outputs 10V to supply power to the main board 10, and after the main board 10 works normally, a switch signal is given to the power board, so that the power board outputs the first voltage to supply power to the main board 10 , the main board 10 is in a stable working state, so as to subsequently control the work of the second conversion module 32, so that the second conversion module 32 outputs a third voltage to the MINI LED screen 20, and then controls the MINI LED screen 20 to light up.
  • the second converting module 32 includes an enabling switching unit 321 and a second converting unit 322; the enabling switching unit 321 is connected to the first converting unit and the second converting unit respectively.
  • the conversion unit 322 is connected to convert the first power supply (PWM_VCC in this embodiment) into a second power supply (VCC_27V in this embodiment) according to the enable signal output by the main board 10 and output it to the second power supply.
  • the second conversion unit 322 is connected to the MINI LED screen 20, and is used to convert the high-voltage direct current into the third voltage to supply power to the MINI LED screen 20 according to the second power supply, thereby realizing The lighting of the MINI LED screen 20;
  • the voltage outputs of the first conversion module 31 and the second conversion module 32 in this embodiment are independent of each other, and the output of one voltage does not interfere with the output of the other voltage, thereby effectively avoiding circuit
  • the interference problem between each channel because each output is completely separated, when the load of one channel changes, it will not affect the output of the other channel, which ensures the normal and stable operation of the system.
  • the independent output voltage on the power board makes the whole machine It is stable and normal when working, which can effectively improve the electrical performance of the product, improve the picture quality experience of MINI LED TV, and delay the service life of the screen.
  • the standby control unit includes a standby switching subunit 311 and a step-down subunit 312; the standby switching subunit 311 is connected to the main board 10 and the The first conversion unit is connected, and is used to control the startup of the first conversion unit according to the switch signal output by the main board 10; the step-down sub-unit 312 is connected to the main board 10 and the first conversion unit respectively, and is used to Provide a feedback signal for the first conversion unit according to the power-on/off signal; after the standby switching subunit 311 receives a high-level power-on/off signal, exit the standby module to wake up the first conversion unit, so that the The first conversion unit exits the standby module and enters the working mode.
  • the step-down subunit 312 will also provide a feedback signal to the first conversion unit according to the high-level switch signal, so that the first conversion unit In normal operation, the first voltage and the second voltage are output to supply power for the motherboard 10 , thereby ensuring the stable operation of the motherboard 10 .
  • the first conversion unit includes a conversion sub-unit 3121 and a power supply sub-unit 3122; the conversion sub-unit 3121 is respectively connected to the power supply sub-unit 3122 and the main board 10 for After the power supply is turned on, output the power supply voltage to supply power to the motherboard 10, and output the first voltage and the second voltage to supply power to the motherboard 10 after starting, and output the high-voltage direct current to the second conversion unit 322; the power supply The electronic unit 3122 is configured to output the first power supply to the enabling switching unit 321 according to the control signal output by the conversion subunit 3121, and then provide electric energy for the enabling switching unit 321, ensuring that the enabling switching unit 321 can provide electric energy for the operation of the second converting unit 322 .
  • the second conversion unit 322 includes a main LLC circuit 3221 and a main LLC transformer 3222, and the main LLC circuit 3221 is connected to the enabling switching unit 321 and the main LLC transformer 3222 respectively.
  • the LLC transformer 3222 is connected to start the main LLC transformer 3222 according to the second power supply, and the main LLC transformer 3222 is connected to the MINI LED screen 20 to convert the high voltage direct current into a third voltage Output to the MINI LED screen 20, the main LLC circuit 3221 starts the main LLC transformer 3222 after receiving the second power output from the enabling switching unit 321, then the main LLC transformer 3222 will After the high-voltage direct current is converted, the third voltage is output to the MINI LED screen 20, so that the MINI LED screen 20 is lit, and the driving process of the MINI LED screen 20 is completed.
  • the conversion subunit 3121 includes a bridgeless PFC circuit, an auxiliary LLC circuit and an auxiliary LLC transformer 3211 integrated in the same semiconductor chip package, wherein the chip model of the integrated bridgeless PFC circuit and LLC controller is U_MD6751,
  • the bridgeless PFC circuit outputs high-voltage direct current to the auxiliary LLC circuit after starting, and after the auxiliary LLC circuit controls the LLC transformer to start, the auxiliary LLC transformer 3211 converts the high-voltage direct current into the first voltage and the second voltage to supply power to the main board 10 ;
  • the bridgeless PFC circuit also outputs high-voltage direct current to the second conversion module 32, so that the main circuit LLC transformer 3222 in the second conversion module 32 outputs the third voltage to supply power to the MINI LED screen 20, thus the present application
  • the architecture of the MINI LED drive power supply uses independent conversion circuits, and uses different transformers to output different voltages, thereby reducing the mutual interference between outputs.
  • the enable switching unit 321 includes a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 , the fifth resistor R5, the sixth resistor R6, the first transistor Q1, the second transistor Q2, the first capacitor C1, the second capacitor C2, the first Zener diode ZD1 and the first photocoupler OP1;
  • the anode of the first diode D1 is connected to the enable signal input end, the anode of the second diode D2 is connected to the LED_ON signal end, and the cathode of the first diode D1 is connected to the second diode
  • the negative poles of the tube D2 are all connected to one end of the first resistor R1, and the other end of the first resistor R1, one end of the second resistor R2 and one end of the first capacitor C1 are all connected to the first three
  • the base of the transistor Q1 is connected, the emitter of
  • the first triode Q1 is turned on, so that the conduction amount of the first photocoupler OP1 increases, and the base of the second diode D2 obtains a voltage difference, and the first diode D2 is saturated and turned on.
  • the power supply is converted into a second power supply to the main LLC circuit 3221, and then the main LLC transformer 3222 is activated by the main LLC circuit 3221, and the main LLC transformer 3222 converts high-voltage direct current into a third voltage for the MINI LED screen 20 , so that the MINI LED screen 20 is lit.
  • the standby switching subunit 311 includes a third diode D3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a third transistor Q3 , a third capacitor C3 and a second photocoupler OP2; the anode of the third diode D3 is connected to the motherboard 10, and the cathode of the third diode D3 is connected to one end of the seventh resistor R7 , the other end of the seventh resistor R7, one end of the eighth resistor R8, and one end of the third capacitor C3 are all connected to the base of the third transistor Q3, and the third transistor The emitter of Q3, the other end of the third capacitor C3 and the other end of the eighth resistor R8 are all grounded; the collector of the third triode Q3 is connected to the second end of the second photocoupler OP2 Pin connection, the first pin of the second photocoupler OP2 is connected to the first voltage input terminal
  • the step-down subunit 312 includes a fourth diode D4, an eleventh resistor R11, a twelfth resistor R12, a fourth capacitor C4, and a fourth transistor Q4 , the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the Twenty-first resistor R21, twenty-second resistor R22, twenty-third resistor R23, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, regulator U1,
  • One end of the capacitor C8 and one end of the twentieth resistor R20 are both connected to one end of the fifth capacitor C5, the first pin of the voltage regulator U1 is connected to one end of the eighteenth resistor R18, and the The other end of the sixth capacitor C6 is connected to one end of the twenty-second resistor R22, the other end of the twenty-second resistor R22, one end of the twenty-third resistor R23, the ninth capacitor C9 One end, the other end of the seventh capacitor C7 and the second pin of the voltage regulator U1 are all connected to the second pin of the third photocoupler OP3, and the other end of the fifth capacitor C5 is connected to the second pin of the third photocoupler OP3.
  • One end of the sixteenth resistor R16 is connected, the other end of the sixteenth resistor R16 is connected to the other end of the seventeenth resistor R17, the other end of the eighth capacitor C8 is connected to the nineteenth resistor
  • One end of R19 is connected, the other end of the nineteenth resistor R19, the other end of the twentieth resistor R20 and one end of the twenty-first resistor R21 are all connected to electricity, and the twenty-first resistor R21 is connected to The other end, one end of the twenty-third resistor R23 and the first pin of the third photocoupler OP3 are connected to the OVP_1 signal end, the other end of the fifteenth resistor R15, the eighteenth resistor
  • the other end of R18, the other end of the ninth capacitor C9 and the third pin of the voltage regulator U1 are all grounded, and the third photocoupler OP3
  • the third pin of the OP3 and the anode of the second Zener diode ZD2 are grounded, the fourth pin of the third photocoupler
  • the fourth transistor Q4 is saturated and turned on, and the thirteenth transistor Q4 is turned on in saturation.
  • the resistor R13 and the fourteenth resistor R14 are connected in parallel with the fifteenth resistor R15, so that the current flowing through the voltage regulator U1 increases, and the conduction of the third photocoupler OP3 increases, then the step-down subunit 312 exits the standby module at this time.
  • a feedback signal will be sent to the conversion subunit 3121, then the bridgeless PFC circuit in the conversion subunit 3121 starts to work, the output voltage of 10V becomes 12V, and the conversion subunit 3121 also outputs the first power supply and high voltage DC Give the second conversion module 32, so that light MINI LED screen 20.
  • the power supply unit 3122 includes a fifth diode D5, a sixth diode D6, a third Zener diode ZD3, a twenty-fourth resistor R24, and a twenty-fifth resistor R25 , the twenty-sixth resistor R26, the twenty-seventh resistor R27, the twenty-eighth resistor R28, the twenty-ninth resistor R29, the thirtieth resistor R30, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14, the fifth transistor Q5, the sixth transistor Q6 and the seventh transistor Q7; the other end of the twenty-fourth resistor R24 is connected to the first
  • the collector of the fifth triode Q5 is connected to one end of the twenty-fifth resistor R25 and one end of the tenth capacitor C10, and the other end of the tenth capacitor C10 is connected to the catho
  • One end of the twenty-seventh resistor R27, one end of the eleventh capacitor C11 are connected to the emitter of the seventh transistor Q7, and the other end of the eleventh capacitor C11 is connected to the sixth transistor Q7.
  • the emitter of Q6, one end of the twenty-ninth resistor R29 and one end of the twelfth capacitor C12 are all grounded, the other end of the twenty-seventh resistor R27 and one end of the twenty-eighth resistor R28 are connected to the base of the seventh transistor Q7, the other end of the twenty-eighth resistor R28 is connected to the collector of the sixth transistor Q6, and the other end of the twenty-sixth resistor R26
  • One end, the other end of the twelfth capacitor C12 and one end of the thirtieth resistor R30 are all connected to the base of the sixth transistor Q6, and the collector of the seventh transistor Q7 is connected to the One end of the thirteenth capacitor C13 is connected to the anode of the sixth diode D6,
  • the power board After the AC power is connected, the power board outputs 10V to supply power to the main board 10.
  • a high-level ON/OFF signal is provided to the power board, the third transistor Q3 is turned on, and the bridgeless PFC starts to work, and the rectified The voltage is boosted to 400V high-voltage direct current, and a high-level VCC2_CTRL signal is output to control the sixth transistor Q6 and the seventh transistor Q7 to be turned on, supplying the first power provided by the electronic circuit to enable the switching unit 321 .
  • the switch signal ON/OFF is high, the step-down sub-circuit starts to switch to the normal working mode. After about T1, the output voltage of the first conversion module 31 gradually rises from 10V to 12V and 20V.
  • the +12V voltage output of the power board is stable to supply power to the main board 10, and the 20V voltage output of the power board is stable after T5 time.
  • the main board 10 sends a high-level ENA signal to the power supply board after an interval of about T3.
  • the enabling switching unit 321 starts to work, and converts the first power supply to The second power supply is output to the main road LLC circuit 3221, and then the main road LLC circuit 3221 starts the main road LLC transformer 3222 to output +28V, and the MINI LED screen 20 will be lit up, and after a time of T4, the stable output is reached, and the MINI LED screen 20 is lit. Therefore, it takes at least 36ms to turn on from +12V to +28V.
  • the main board 10 on the screen receives the standby signal
  • the main board 10 outputs a low-level ENA signal to the power board to enable the switching unit 321 to stop working and no longer output the second power supply, so the power board turns off the +28V output.
  • the main board 10 pulls the ON/OFF signal low.
  • the standby switching subunit 311 triggers the bridgeless PFC circuit to stop working according to the low-level ON/OFF signal and enters the standby state.
  • the flat ON/OFF signal provides a feedback signal, so that the output voltage 12V of the conversion subunit 3121 drops to 10V to supply power to the mainboard 10, which is equivalent to providing 10V voltage for the mainboard 10 during standby; after T7 time, the output voltage of 20V stops Output, the whole machine enters the standby state, and the T6 time is not less than 30ms.
  • This application boosts the AC input voltage to 400V DC high voltage by adopting an independent transformer and PFC+LLC integrated control module, converts the high voltage DC into independent +12V and +28V, and adjusts the power supply through the signal given by the main board Switching sequence, +12V and +28V switch output separately, and controlled by ON/OFF signal at the same time.
  • +28V supplies power to the screen alone
  • another control signal ENA is set up. The screen will be lit only when the ON/OFF and ENA signals are turned on at the same time, so as to control the timing of power on and off, similar to MINI The timing of the LED screen 20 matches.
  • +12V and +28V are independent of each other from the root, and whether the output and feedback adjustment circuits of each channel work normally will not affect the working state of the other channel, thereby avoiding The problem of interference between lines is eliminated. Since the outputs of each channel are completely separated, when the load of one channel changes, it will not affect the output of the other channel, which ensures the normal and stable operation of the system. The independence of the output voltage on the power board makes the whole machine work stably and normally. It can effectively improve the electrical performance of the product, improve the picture quality experience of MINI LED TV, and delay the service life of the screen.
  • the present application also provides a MINI LED TV correspondingly, which includes the above-mentioned MINI LED driving power supply. Since the MINI LED driving power supply has been described in detail above, it will not be described in detail here.
  • the present application provides a MINI LED drive power supply and a MINI LED TV.
  • the MINI LED drive power supply includes a power board connected to the main board and the MINI LED screen, and the power board includes a first conversion module and a second conversion module.
  • the first conversion module is connected to the main board and the second conversion module, and is used to output a power supply voltage to supply power to the main board after the power is turned on, and to output a first voltage according to a switch signal output by the main board and the second voltage to supply power to the main board, and output the first power supply and high-voltage direct current to the second conversion module;
  • the second conversion module is connected to the MIN LED screen for enabling output according to the main board
  • the signal and the first power supply convert the high-voltage direct current into a third voltage to the MINI LED screen, light up the MINI LED screen, and convert the first voltage and the third voltage separately, so that the output of the third voltage Whether it works normally will not affect the working state of the other line, thus avoiding the interference problem between lines.

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Abstract

一种MINI LED驱动电源及MINI LED电视，MINI LED驱动电源包括与主板（10）和MINI LED屏（20）连接的电源板，电源板包括第一转换模块（31）和第二转换模块（32），第一转换模块（31）在接通电源后输出电源电压给主板（10）供电，并根据主板（10）输出的开关机信号输出第一电压和第二电压给主板（10）供电，以及输出第一电源和高压直流至第二转换模块（32）；第二转换模块（32）根据主板（10）输出的使能信号和第一电源将高压直流转换成第三电压至MINI LED屏（20），点亮MINI LED屏（20），通过将第一电压和第三电压单独转换输出，使得第三电压的输出是否正常工作都不会影响到另一路的工作状态，从而避免了线路之间的干扰问题。

Description

一种MINI LED驱动电源及MINI LED电视
优先权
本申请要求申请日为2021年7月28日，申请号为202110855542.7的中国专利优先权，本申请结合了上述专利的技术方案。
技术领域
本申请涉及电源技术领域，特别涉及一种MINI LED驱动电源及MINI LED电视。
背景技术
大多数液晶电视的背光源使用的是LED(发光二极管)，而Mini-LED电视采用的是一种比传统LED体积更小的光源。Mini LED的宽度约为200微米，是LCD面板中使用的标准LED尺寸的五分之一。由于它们的体积足够小，因此可以更多的分布整块屏幕上。当一个屏幕内拥有足够多的LED背光，画面的明暗控制、色彩色阶等就可以被控制的足够好，因而提供的图像质量也会更好。
为了实现高质量图像，在MINI LED电视机的电源设计中，对电源输出电压纹波，输出电压精度有较高要求。
根据屏幕的尺寸及整机功耗不同，采用的电源解决方案也不尽相同，常用的输出有+12V和+28V。传统的电源板上+12V与+28V电压的转换输出共用了一个变压器，如图1和图2所示，在大功率输出时+12V电压与+28V电压之间势必会相互影响，产生不可预知的结果，使得研发调试周期增长。
因而现有技术还有待改进和提高。
申请内容
鉴于上述现有技术的不足之处，本申请的目的在于提供一种MINI LED驱动电源及MINI LED电视，能够有效解决大功率输出时不同电压之间相互影响的问题。
为了达到上述目的，本申请采取了以下技术方案：
一种MINI LED驱动电源，包括与主板和MINI LED屏连接的电源板，所述电源板包括第一转换模块和第二转换模块；
所述第一转换模块与所述主板和所述第二转换模块连接，用于在接通电源后输出电源电压给所述主板供电，并根据所述主板输出的开关机信号输出第一电压和第二电压给所述主板供电，以及输出第一电源和高压直流至所述第二转换模块；
所述第二转换模块与所述MIN LED屏连接，用于根据所述主板输出的使能信号和所述第一电源将所述高压直流转换成第三电压至所述MINI LED屏，点亮MINI LED屏。
所述的MINI LED驱动电源中，所述第一转换模块包括待机控制单元和第一转换单元；
所述第一转换单元与所述主板连接，用于在接通电源后输出电源电压为所述主板供电；
所述待机控制单元分别与所述主板和所述第一转换单元连接，用于根据主板输出的开关机信号控制所述第一转换单元启动；
所述第一转换单元还用于在启动后输出第一电压和第二电压给主板供电，并输出所述高压直流和所述第一电源至所述第二转换模块。
所述的MINI LED驱动电源中，所述第二转换模块包括使能切换单元和第二转换单元；
所述使能切换单元分别与所述第一转换单元和所述第二转换单元连接，用于根据所述主板输出的使能信号将所述第一电源转换成第二电源输出至所述第二转换单元；
所述第二转换单元与所述MINI LED屏连接，用于根据所述第二电源将所述高压直流转换为所述第三电压给MINI LED屏供电。
所述的MINI LED驱动电源中，所述待机控制单元包括待机切换子单元和降压子单元；
所述待机切换子单元分别与所述主板和所述第一转换单元连接，用于根据所述主板输出的开关机信号控制所述第一转换单元启动；
所述降压子单元分别与所述主板和所述第一转换单元连接，用于根据所述开关机信号为所述第一转换单元提供反馈信号。
所述的MINI LED驱动电源中，所述第一转换单元包括转换子单元和供电子单元；
所述转换子单元分别与所述供电子单元和所述主板连接，用于在接通电源后输出电源 电压为所述主板供电，并在启动后输出第一电压和第二电压给主板供电，以及输出所述高压直流至所述第二转换单元；
所述供电子单元用于根据所述转换子单元输出的控制信号输出所述第一电源至所述使能切换单元。
所述的MINI LED驱动电源中，所述第二转换单元包括主路LLC电路和主路LLC变压器；
所述主路LLC电路分别与所述使能切换单元和所述主路LLC变压器连接，用于根据所述第二电源启动所述主路LLC变压器；
所述主路LLC变压器与所述MINI LED屏连接，用于将所述高压直流转换成第三电压输出至所述MINI LED屏。
所述的MINI LED驱动电源中，所述使能切换单元包括第一二极管、第二二极管、第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻、第一三极管、第二三极管、第一电容、第二电容、第一稳压二极管和第一光电耦合器；
所述第一二极管的正极与使能信号输入端连接，所述第二二极管的正极与LED_ON信号端连接，所述第一二极管的负极和所述第二二极管的负极均与所述第一电阻的一端连接，所述第一电阻的另一端、所述第二电阻的一端和所述第一电容的一端均与所述第一三极管的基极连接，所述第一三极管的发射极、所述第一电容的另一端和所述第二电阻的另一端均接地，所述第一三极管的集电极与所述第一光电耦合器的第2脚连接，所述第一光电耦合器的第1脚通过所述第三电阻连接第一电压输入端，所述第一光电耦合器的第3脚与所述第四电阻的一端连接，所述第四电阻的另一端与所述第五电阻的一端、所述第二三极管的基极和所述第一稳压二极管的负极连接，所述第一稳压二极管的正极和所述第五电阻的另一端接地，所述第一三极管的发射极、所述第二电容的一端和所述第六电阻的一端均与第二电源输出端连接，所述第二电容的另一端接地，所述第二三极管的集电极、所述第一光电耦合器的第4脚和所述第六电阻的另一端均与第一电源输入端连接。
所述的MINI LED驱动电源中，所述待机切换子单元包括第三二极管、第七电阻、第八电阻、第九电阻、第十电阻、第三三极管、第三电容和第二光电耦合器；
所述第三二极管的正极与所述主板连接，所述第三二极管的负极与所述第七电阻的一端连接，所述第七电阻的另一端、所述第八电阻的一端和所述第三电容的一端均与所述第三三极管的基极连接，所述第三三极管的发射极、所述第三电容的另一端和所述第八电阻的另一端均接地；所述第三三极管的集电极与所述第二光电耦合器的第2脚连接，所述第二光电耦合器的第1脚通过所述第九电阻与第一电压输入端连接，所述第二光电耦合器的第3脚与Auto_stb信号端连接，所述第二光电耦合器的第4脚与DVCC_1信号端连接。
所述的MINI LED驱动电源中，所述降压子单元包括第四二极管、第十一电阻、第十二电阻、第四电容、第四三极管、第十三电阻、第十四电阻、第十五电阻、第十六电阻、第十七电阻、第十八电阻、第十九电阻、第二十电阻、第二十一电阻、第二十二电阻、第二十三电阻、第五电容、第六电容、第七电容、第八电容、第九电容、稳压器、第三光电耦合器和第二稳压二极管；
所述第四二极管的正极与所述主板连接，所述第四二极管的负极与所述第十一电阻的一端连接，所述第十一电阻的另一端、所述第十二电阻的一端和所述第四电容的一端均与所述第四三极管的基极连接，所述第四三极管的发射极、所述第四电容的另一端和所述第十二电阻的另一端均接地，所述第四三极管的集电极与所述第十三电阻的一端连接，所述第十三电阻的另一端与所述第十四电阻的一端连接，所述第十四电阻的另一端与所述第十五电阻的一端、所述第七电容的一端、所述第六电容的一端、所述第五电容的一端和所述第十八电阻的一端连接，所述第十七电阻的一端、所述第八电容的一端和所述第二十电阻的一端均与所述第五电容的一端连接，所述稳压器的第1脚与所述第十八电阻的一端连接，所述第六电容的另一端与所述第二十二电阻的一端连接，所述第二十二电阻的另一端、所述第二十三电阻的一端、所述第九电容的一端、所述第七电容的另一端和所述稳压器的第2脚均与所述第三光电耦合器的第2脚连接，所述第五电容的另一端与所述第十六电阻的一端连接，所述第十六电阻的另一端和所述第十七电阻的另一端均接电，所述第八电容的另一端与所述第十九电阻的一端连接，所述第十九电阻的另一端、所述第二十电阻的另一端和所述第二十一电阻的一端均接电，所述第二十一电阻的另一端、所述第二十三电阻的一端和所述第三光电耦合器的第1脚均与OVP_1信号端连接，所述第十五电阻的另一端、 所述第十八电阻的另一端、所述第九电容的另一端和所述稳压器的第3脚均接地，所述第三光电耦合器的第3脚和所述第二稳压二极管的正极均接地，所述第三光电耦合器的第4脚和所述第二稳压二极管的负极与FB_2信号端连接。
一种MINI LED电视，包括上述的MINI LED驱动电源。
相较于现有技术，本申请提供的一种MINI LED驱动电源及MINI LED电视，MINI LED驱动电源包括与主板和MINI LED屏连接的电源板，所述电源板包括第一转换模块和第二转换模块，所述第一转换模块与所述主板和所述第二转换模块连接，用于在接通电源后输出电源电压给所述主板供电，并根据所述主板输出的开关机信号输出第一电压和第二电压给所述主板供电，以及输出第一电源和高压直流至所述第二转换模块；所述第二转换模块与所述MIN LED屏连接，用于根据所述主板输出的使能信号和所述第一电源将所述高压直流转换成第三电压至所述MINI LED屏，点亮MINI LED屏，通过将将第一电压和第三电压单独转换输出，使得第三电压的输出是否正常工作都不会影响到另一路的工作状态，从而避免了线路之间的干扰问题。
附图说明
图1和图2为现有的驱动电源的架构示意图；
图3为本申请提供的MINI LED驱动电源的架构示意图；
图4为本申请提供的MINI LED驱动电源中使能切换单元的电路图；
图5为本申请提供的MINI LED驱动电源中待机切换子单元的电路图；
图6和图7为本申请提供的MINI LED驱动电源中降压子单元的电路图；
图8为本申请提供的MINI LED驱动电源中供电子单元的电路图；
图9为本申请提供的MINI LED驱动电源的开关机时序示意图。
具体实施方式
本申请提供一种MINI LED驱动电源及MINI LED电视，能够有效解决大功率输出时不同电压之间相互影响的问题。
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
本申请提供的MINI LED驱动电源除在MINI LED电视领域使用外，还可以应用于OLED、LED监视器、电教、背投等离子等显示相关的电源驱动。
请参阅图3，本申请提供的一种MINI LED驱动电源包括与主板10和MINI LED屏20连接的电源板，所述电源板包括第一转换模块31和第二转换模块32；所述第一转换模块31与所述主板10和所述第二转换模块32连接，用于在接通电源后输出电源电压给所述主板10供电，并根据所述主板10输出的开关机信号(本实施例中为ON_OFF)输出第一电压(本实施例中为+12V)和第二电压(本实施例中为+20V)给所述主板10供电，以及输出第一电源和高压直流至所述第二转换模块32；所述第二转换模块32与所述MIN LED屏连接，用于根据所述主板10输出的使能信号和所述第一电源将所述高压直流转换成第三电压(本实施例中为+28V)至所述MINI LED屏20，点亮MINI LED屏20；本申请通过将第一电压和第三电压单独转换输出，另外将第三电压单独给屏体供电，使得第三电压的输出是否正常工作都不会影响到另一路的工作状态，从而避免了线路之间的干扰问题。
进一步地，所述第一转换模块31包括待机控制单元(图中未示出)和第一转换单元(图中未示出)，所述第一转换单元与所述主板10连接，用于在接通电源后输出电源电压(本实施例中为10V)为所述主板10供电，所述待机控制单元分别与所述主板10和所述第一转换单元连接，用于根据主板10输出的开关机信号控制所述第一转换单元启动，所述第一转换单元还用于在启动后输出第一电压和第二电压给主板10供电，并输出所述高压直流和所述第一电源至所述第二转换模块32；具体来说，接通交流电后，由电源板输出10V给主板10供电，主板10工作正常之后给电源板一个开关机信号，使得电源板输出第一电压给主板10供电，主板10稳定之后工作状态，以便于后续控制所述第二转换模块32的工作，使得第二转换模块32输出第三电压给到MINI LED屏20体，进而控制MINI LED屏20体点亮。
进一步地，请一并参阅图4，所述第二转换模块32包括使能切换单元321和第二转换 单元322；所述使能切换单元321分别与所述第一转换单元和所述第二转换单元322连接，用于根据所述主板10输出的使能信号将所述第一电源(本实施例中为PWM_VCC)转换成第二电源(本实施例中为VCC_27V)输出至所述第二转换单元322；所述第二转换单元322与所述MINI LED屏20连接，用于根据所述第二电源将所述高压直流转换为所述第三电压给MINI LED屏20供电，进而实现了MINI LED屏20体的点亮；本实施例中的第一转换模块31和第二转换模块32的电压输出相互独立，其中一路电压的输出并不干扰另一路电压的输出，从而有效避免了线路之间的干扰问题；由于各路输出完全分离，当单路负载变化时不会对另一路的输出产生影响，这就保证了系统正常稳定的工作，电源板上输出电压的独立，使得整机在工作时稳定正常，可以有效提高产品的电性能，提高MINI LED电视的画质体验，延缓屏体的使用寿命。
进一步地，请一并参阅图5、图6和图7，所述待机控制单元包括待机切换子单元311和降压子单元312；所述待机切换子单元311分别与所述主板10和所述第一转换单元连接，用于根据所述主板10输出的开关机信号控制所述第一转换单元启动；所述降压子单元312分别与所述主板10和所述第一转换单元连接，用于根据所述开关机信号为所述第一转换单元提供反馈信号；所述待机切换子单元311接收到高电平的开关机信号之后，退出待机模块唤醒所述第一转换单元，使得所述第一转换单元退出待机模块进入工作模式，与此同时所述降压子单元312也会根据高电平的开关机信号给所述第一转换单元提供一个反馈信号，使得所述第一转换单元正常工作输出第一电压和第二电压为主板10供电，进而确保所述主板10的稳定工作。
进一步地，请一并参阅图8，所述第一转换单元包括转换子单元3121和供电子单元3122；所述转换子单元3121分别与所述供电子单元3122和所述主板10连接，用于在接通电源后输出电源电压为所述主板10供电，并在启动后输出第一电压和第二电压给主板10供电，以及输出所述高压直流至所述第二转换单元322；所述供电子单元3122用于根据所述转换子单元3121输出的控制信号输出所述第一电源至所述使能切换单元321，进而为所述使能切换单元321提供电能，确保所述使能切换单元321能够为所述第二转换单元322的工作提供电能。
进一步地，请继续参阅图3，所述第二转换单元322包括主路LLC电路3221和主路LLC变压器3222，所述主路LLC电路3221分别与所述使能切换单元321和所述主路LLC变压器3222连接，用于根据所述第二电源启动所述主路LLC变压器3222，所述主路LLC变压器3222与所述MINI LED屏20连接，用于将所述高压直流转换成第三电压输出至所述MINI LED屏20，所述主路LLC电路3221接收到所述使能切换单元321输出的第二电源后启动所述主路LLC变压器3222，那么所述主路LLC变压器3222将所述高压直流电进行转换后输出第三电压至MINI LED屏20，使得MINI LED屏20点亮，完成MINI LED屏20的驱动过程。
进一步地，所述转换子单元3121包括集成在同一半导体芯片封装中的无桥PFC电路和辅路LLC电路以及辅路LLC变压器3211，其中该集成有无桥PFC电路和LLC控制器的芯片型号为U_MD6751，所述无桥PFC电路在启动后输出高压直流电至辅路LLC电路，由辅路LLC电路控制所述LLC变压器启动之后，由辅路LLC变压器3211将高压直流电转换成第一电压和第二电压给主板10供电；其中，所述无桥PFC电路还将高压直流电输出给第二转换模块32，以便于第二转换模块32中的主路LLC变压器3222输出第三电压给MINI LED屏20供电，由此本申请中的MINI LED驱动电源的架构中采用了相互独立的转换电路，采用了不同的变压器输出不同的电压，进而降低了输出之间的相互干扰。
进一步地，请继续参阅图4，所述使能切换单元321包括第一二极管D1、第二二极管D2、第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4、第五电阻R5、第六电阻R6、第一三极管Q1、第二三极管Q2、第一电容C1、第二电容C2、第一稳压二极管ZD1和第一光电耦合器OP1；所述第一二极管D1的正极与使能信号输入端连接，所述第二二极管D2的正极与LED_ON信号端连接，所述第一二极管D1的负极和所述第二二极管D2的负极均与所述第一电阻R1的一端连接，所述第一电阻R1的另一端、所述第二电阻R2的一端和所述第一电容C1的一端均与所述第一三极管Q1的基极连接，所述第一三极管Q1的发射极、所述第一电容C1的另一端和所述第二电阻R2的另一端均接地，所述第一三极管Q1的集电极与所述第一光电耦合器OP1的第2脚连接，所述第一光电耦合器OP1的第1脚通过所述第三电阻R3连接第一电压输入端，所述第一光电耦合器OP1的第3脚 与所述第四电阻R4的一端连接，所述第四电阻R4的另一端与所述第五电阻R5的一端、所述第二三极管Q2的基极和所述第一稳压二极管ZD1的负极连接，所述第一稳压二极管ZD1的正极和所述第五电阻R5的另一端接地，所述第一三极管Q1的发射极、所述第二电容C2的一端和所述第六电阻R6的一端均与第二电源输出端连接，所述第二电容C2的另一端接地，所述第二三极管Q2的集电极、所述第一光电耦合器OP1的第4脚和所述第六电阻R6的另一端均与第一电源输入端连接；当主板10稳定工作之后，所述主板10输出使能信号(本实施例中为BL_EN)至所述使能切换单元321，此时，第一三极管Q1导通，使得第一光电耦合器OP1导通量增加，第二二极管D2的基极获得电压差，饱和导通，将第一电源转换成第二电源给主路LLC电路3221，之后由主路LLC电路3221启动所述主路LLC变压器3222，所述主路LLC变压器3222将高压直流电转换成第三电压给到MINI LED屏20，使得MINI LED屏20被点亮。
进一步地，请继续参阅图5，所述待机切换子单元311包括第三二极管D3、第七电阻R7、第八电阻R8、第九电阻R9、第十电阻R10、第三三极管Q3、第三电容C3和第二光电耦合器OP2；所述第三二极管D3的正极与所述主板10连接，所述第三二极管D3的负极与所述第七电阻R7的一端连接，所述第七电阻R7的另一端、所述第八电阻R8的一端和所述第三电容C3的一端均与所述第三三极管Q3的基极连接，所述第三三极管Q3的发射极、所述第三电容C3的另一端和所述第八电阻R8的另一端均接地；所述第三三极管Q3的集电极与所述第二光电耦合器OP2的第2脚连接，所述第二光电耦合器OP2的第1脚通过所述第九电阻R9与第一电压输入端连接，所述第二光电耦合器OP2的第3脚与Auto_stb信号端连接，所述第二光电耦合器OP2的第4脚与DVCC_1信号端连接；接通交流电后，电源板通过转换子单元3121输出+10V电压给主板10供电，主板10正常工作后，给电源板提供一个开关信号，此时待机切换子单元311接收到开关信号后，第三三极管Q3饱和导通，第二光电耦合器OP2导通量增加，DVCC1信号端给Auto_stb信号端供电，唤醒待机模式，使得转换子单元3121退出待机模式，进入工作状态，由此完成待机子单元待机模式的环形过程。
进一步地，请继续参阅图6和图7，所述降压子单元312包括第四二极管D4、第十一 电阻R11、第十二电阻R12、第四电容C4、第四三极管Q4、第十三电阻R13、第十四电阻R14、第十五电阻R15、第十六电阻R16、第十七电阻R17、第十八电阻R18、第十九电阻R19、第二十电阻R20、第二十一电阻R21、第二十二电阻R22、第二十三电阻R23、第五电容C5、第六电容C6、第七电容C7、第八电容C8、第九电容C9、稳压器U1、第三光电耦合器OP3和第二稳压二极管ZD2；所述第四二极管D4的正极与所述主板10连接，所述第四二极管D4的负极与所述第十一电阻R11的一端连接，所述第十一电阻R11的另一端、所述第十二电阻R12的一端和所述第四电容C4的一端均与所述第四三极管Q4的基极连接，所述第四三极管Q4的发射极、所述第四电容C4的另一端和所述第十二电阻R12的另一端均接地，所述第四三极管Q4的集电极与所述第十三电阻R13的一端连接，所述第十三电阻R13的另一端与所述第十四电阻R14的一端连接，所述第十四电阻R14的另一端与所述第十五电阻R15的一端、所述第七电容C7的一端、所述第六电容C6的一端、所述第五电容C5的一端和所述第十八电阻R18的一端连接，所述第十七电阻R17的一端、所述第八电容C8的一端和所述第二十电阻R20的一端均与所述第五电容C5的一端连接，所述稳压器U1的第1脚与所述第十八电阻R18的一端连接，所述第六电容C6的另一端与所述第二十二电阻R22的一端连接，所述第二十二电阻R22的另一端、所述第二十三电阻R23的一端、所述第九电容C9的一端、所述第七电容C7的另一端和所述稳压器U1的第2脚均与所述第三光电耦合器OP3的第2脚连接，所述第五电容C5的另一端与所述第十六电阻R16的一端连接，所述第十六电阻R16的另一端和所述第十七电阻R17的另一端均接电，所述第八电容C8的另一端与所述第十九电阻R19的一端连接，所述第十九电阻R19的另一端、所述第二十电阻R20的另一端和所述第二十一电阻R21的一端均接电，所述第二十一电阻R21的另一端、所述第二十三电阻R23的一端和所述第三光电耦合器OP3的第1脚均与OVP_1信号端连接，所述第十五电阻R15的另一端、所述第十八电阻R18的另一端、所述第九电容C9的另一端和所述稳压器U1的第3脚均接地，所述第三光电耦合器OP3的第3脚和所述第二稳压二极管ZD2的正极均接地，所述第三光电耦合器OP3的第4脚和所述第二稳压二极管ZD2的负极与FB_2信号端连接；所述转换子单元3121在所述待机切换子单元311的控制下进入工作状态，与此同时，所述降压子单元312中在接收到开 关信号后，第四三极管Q4饱和导通，第十三电阻R13和第十四电阻R14与第十五电阻R15并联，使得流过稳压器U1的电流增加，第三光电耦合器OP3的导通量增加，那么此时降压子单元312退出待机模块，同时会给到转换子单元3121一个反馈信号，那么转换子单元3121中的无桥PFC电路开始工作，输出的10V电压变成12V，且所述转换子单元3121还输出第一电源和高压直流给第二转换模块32，以便于点亮MINI LED屏20。
进一步地，请继续参阅图8，所述供电子单元3122包括第五二极管D5、第六二极管D6、第三稳压二极管ZD3、第二十四电阻R24、第二十五电阻R25、第二十六电阻R26、第二十七电阻R27、第二十八电阻R28、第二十九电阻R29、第三十电阻R30、第十电容C10、第十一电容C11、第十二电容C12、第十三电容C13、第十四电容C14、第五三极管Q5、第六三极管Q6和第七三极管Q7；所述第二十四电阻R24的另一端与所述第五三极管Q5的集电极、所述第二十五电阻R25的一端和所述第十电容C10的一端连接，所述第十电容C10的另一端和所述第五二极管D5的负极接地，所述第五二极管D5的正极与所述第三稳压二极管ZD3的正极连接，所述第三稳压二极管ZD3的负极、所述第二十五电阻R25的另一端和所述第二十六电阻R26的一端均与所述第五三极管Q5的基极连接，所述第二十六电阻R26的另一端、所述第五三极管Q5的发射极均与所述第二十七电阻R27的一端、所述第十一电容C11的一端和所述第七三极管Q7的发射极连接，所述第十一电容C11的另一端、所述第六三极管Q6的发射极、所述第二十九电阻R29的一端和所述第十二电容C12的一端均接地，所述第二十七电阻R27的另一端和所述第二十八电阻R28的一端均与所述第七三极管Q7的基极连接，所述第二十八电阻R28的另一端与所述第六三极管Q6的集电极连接，所述第二十六电阻R26的另一端、所述第十二电容C12的另一端和所述第三十电阻R30的一端均与所述第六三极管Q6的基极连接，所述第七三极管Q7的集电极和所述第十三电容C13的一端连接所述第六二极管D6的正极，所述第六二极管D6的负极和所述第十四电容C14的一端均连接所述第一电源输出端，所述第十四电容C14的另一端接地，所述第十三电容C13的另一端接地，所述第三十电阻R30的另一端连接所述转换子单元3121(本实施例中为连接VCC2_CTRL信号端)；当所述转换子单元3121工作之后所述转换子单元3121控制VCC2_CTRL信号端为高电平，使得所述第六三极管Q6和第七三 极管Q7导通，进而输出第一电源至所述使能切换单元321，为所述使能切换单元321的工作提供电能。
进一步地，本申请提供的MINI LED驱动电源的开关机时序示意图如图9所示，以下结合图3至图9对本申请提供的MINI LED驱动电源开机过程和待机过程进行详细说明：
接通交流电后，电源板输出10V给主板10供电，正常工作后，给电源板提供一个高电平的ON/OFF信号，第三三极管Q3导通，无桥PFC开始工作，将整流后的电压升压至400V的高压直流，并且输出高电平VCC2_CTRL信号控制第六三极管Q6和第七三极管Q7导通，供电子电路为使能切换单元321提供的第一电源。同时当开关机信号ON/OFF为高时，此时降压子电路开始切换为正常工作模式，约T1时间后第一转换模块31的输出电压由10V逐渐先后上升至12V和20V，经过在T2时间，电源板+12V电压输出稳定给主板10供电，经过T5时间后电源板20V电压输出稳定。为了点亮屏幕，再间隔大约T3的时间后主板10给电源板发出高电平的ENA信号，接到高电平的ENA信号后，使能切换单元321启动开始工作，将第一电源转换为第二电源输出至主路LLC电路3221，然后主路LLC电路3221启动主路LLC变压器3222输出+28V，MINI LED屏20才会被点亮，历经T4的时间后达到稳定输出，MINI LED屏20被点亮。从而由+12V开启到+28V开启间隔了至少36ms的时间。
当屏上主板10接收到待机信号时，主板10向电源板输出低电平的ENA信号，使能切换单元321停止工作，不再输出第二电源，那么电源板关闭+28V输出。再间隔时间T6后主板10将ON/OFF信号拉低，此时待机切换子单元311根据低电平的ON/OFF信号触发无桥PFC电路停止工作进入待机状态，同时降压子电路根据低电平的ON/OFF信号提供一个反馈信号，使得转换子单元3121的输出电压12V电压下降至10V给主板10供电，相当于待机时为主板10提供10V的电压；再经过T7时间，输出电压20V停止输出，整机进入待机状态，T6时间不少于30ms。
本申请通过采用独立的变压和PFC+LLC一体化控制模块将交流输入电压升压至400V直流高压，高压直流转换成独立的+12V与+28V，并通过主板10给出的信号调整电源的开关机时序，+12V与+28V单独转换输出，并同时受ON/OFF信号的控制。另外，由于+28V 是单独给屏体供电，因而设立了另一控制信号ENA，只有当ON/OFF与ENA信号同时打开时屏体才会被点亮，从而控制电源开关机的时序，与MINI LED屏20的时序相匹配。由于采用了独立的PWM控制器和独立的变压器，+12V与+28V之间从根源上相互独立，每一路的输出及反馈调整电路是否正常工作都不会影响到另一路的工作状态，从而避免了线路之间的干扰问题。由于各路输出完全分离，当单路负载变化时不会对另一路的输出产生影响，这就保证了系统正常稳定的工作，电源板上输出电压的独立，使得整机在工作时稳定正常，可以有效提高产品的电性能，提高MINI LED电视的画质体验，延缓屏体的使用寿命。
本申请还相应提供一种MINI LED电视，其包括如上所述的MINI LED驱动电源，由于上文已对所述MINI LED驱动电源进行了详细描述，此处不作详述。
综上所述，本申请提供的一种MINI LED驱动电源及MINI LED电视，MINI LED驱动电源包括与主板和MINI LED屏连接的电源板，所述电源板包括第一转换模块和第二转换模块，所述第一转换模块与所述主板和所述第二转换模块连接，用于在接通电源后输出电源电压给所述主板供电，并根据所述主板输出的开关机信号输出第一电压和第二电压给所述主板供电，以及输出第一电源和高压直流至所述第二转换模块；所述第二转换模块与所述MIN LED屏连接，用于根据所述主板输出的使能信号和所述第一电源将所述高压直流转换成第三电压至所述MINI LED屏，点亮MINI LED屏，通过将将第一电压和第三电压单独转换输出，使得第三电压的输出是否正常工作都不会影响到另一路的工作状态，从而避免了线路之间的干扰问题。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些改变或替换都应属于本申请所附的权利要求的保护范围。

Claims (15)

  1. 一种MINI LED驱动电源，包括与主板和MINI LED屏连接的电源板，其中，所述电源板包括第一转换模块和第二转换模块；
    所述第一转换模块与所述主板和所述第二转换模块连接，用于在接通电源后输出电源电压给所述主板供电，并根据所述主板输出的开关机信号输出第一电压和第二电压给所述主板供电，以及输出第一电源和高压直流至所述第二转换模块；
    所述第二转换模块与所述MIN LED屏连接，用于根据所述主板输出的使能信号和所述第一电源将所述高压直流转换成第三电压至所述MINI LED屏，点亮MINI LED屏。
  2. 根据权利要求1所述的MINI LED驱动电源，其中，所述第一转换模块包括待机控制单元和第一转换单元；
    所述第一转换单元与所述主板连接，用于在接通电源后输出电源电压为所述主板供电；
    所述待机控制单元分别与所述主板和所述第一转换单元连接，用于根据主板输出的开关机信号控制所述第一转换单元启动；
    所述第一转换单元还用于在启动后输出第一电压和第二电压给主板供电，并输出所述高压直流和所述第一电源至所述第二转换模块。
  3. 根据权利要求2所述的MINI LED驱动电源，其中，所述第二转换模块包括使能切换单元和第二转换单元；
    所述使能切换单元分别与所述第一转换单元和所述第二转换单元连接，用于根据所述主板输出的使能信号将所述第一电源转换成第二电源输出至所述第二转换单元；
    所述第二转换单元与所述MINI LED屏连接，用于根据所述第二电源将所述高压直流转换为所述第三电压给MINI LED屏供电。
  4. 根据权利要求2所述的MINI LED驱动电源，其中，所述待机控制单元包括待机切换子单元和降压子单元；
    所述待机切换子单元分别与所述主板和所述第一转换单元连接，用于根据所述主板输出的开关机信号控制所述第一转换单元启动；
    所述降压子单元分别与所述主板和所述第一转换单元连接，用于根据所述开关机信号为所述第一转换单元提供反馈信号。
  5. 根据权利要求3所述的MINI LED驱动电源，其中，所述第一转换单元包括转换子单元和供电子单元；
    所述转换子单元分别与所述供电子单元和所述主板连接，用于在接通电源后输出电源电压为所述主板供电，并在启动后输出第一电压和第二电压给主板供电，以及输出所述高压直流至所述第二转换单元；
    所述供电子单元用于根据所述转换子单元输出的控制信号输出所述第一电源至所述使能切换单元。
  6. 根据权利要求3所述的MINI LED驱动电源，其中，所述第二转换单元包括主路LLC电路和主路LLC变压器；
    所述主路LLC电路分别与所述使能切换单元和所述主路LLC变压器连接，用于根据所述第二电源启动所述主路LLC变压器；
    所述主路LLC变压器与所述MINI LED屏连接，用于将所述高压直流转换成第三电压输出至所述MINI LED屏。
  7. 根据权利要求3所述的MINI LED驱动电源，其中，所述使能切换单元包括第一二极管、第二二极管、第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻、第一三极管、第二三极管、第一电容、第二电容、第一稳压二极管和第一光电耦合器；
    所述第一二极管的正极与使能信号输入端连接，所述第二二极管的正极与LED_ON信号端连接，所述第一二极管的负极和所述第二二极管的负极均与所述第一电阻的一端连接，所述第一电阻的另一端、所述第二电阻的一端和所述第一电容的一端均与所述第一三极管的基极连接，所述第一三极管的发射极、所述第一电容的另一端和所述第二电阻的另一端均接地，所述第一三极管的集电极与所述第一光电耦合器的第2脚连接，所述第一光电耦合器的第1脚通过所述第三电阻连接第一电压输入端，所述第一光电耦合器的第3脚与所述第四电阻的一端连接，所述第四电阻的另一端与所述第五电阻的一端、所述第二三极管的基极和所述第一稳压二极管的负极连接，所述第一稳压二极管的正极和所述第五电阻的另一端接地，所述第一三极管的发射极、所述第二电容的一端和所述第六电阻的一端均与第二电源输出端连接，所述第二电容的另一端接地，所述第二三极管的集电极、所述第一 光电耦合器的第4脚和所述第六电阻的另一端均与第一电源输入端连接。
  8. 根据权利要求4所述的MINI LED驱动电源，其中，所述待机切换子单元包括第三二极管、第七电阻、第八电阻、第九电阻、第十电阻、第三三极管、第三电容和第二光电耦合器；
    所述第三二极管的正极与所述主板连接，所述第三二极管的负极与所述第七电阻的一端连接，所述第七电阻的另一端、所述第八电阻的一端和所述第三电容的一端均与所述第三三极管的基极连接，所述第三三极管的发射极、所述第三电容的另一端和所述第八电阻的另一端均接地；所述第三三极管的集电极与所述第二光电耦合器的第2脚连接，所述第二光电耦合器的第1脚通过所述第九电阻与第一电压输入端连接，所述第二光电耦合器的第3脚与Auto_stb信号端连接，所述第二光电耦合器的第4脚与DVCC_1信号端连接。
  9. 根据权利要求4所述的MINI LED驱动电源，其中，所述降压子单元包括第四二极管、第十一电阻、第十二电阻、第四电容、第四三极管、第十三电阻、第十四电阻、第十五电阻、第十六电阻、第十七电阻、第十八电阻、第十九电阻、第二十电阻、第二十一电阻、第二十二电阻、第二十三电阻、第五电容、第六电容、第七电容、第八电容、第九电容、稳压器、第三光电耦合器和第二稳压二极管；
    所述第四二极管的正极与所述主板连接，所述第四二极管的负极与所述第十一电阻的一端连接，所述第十一电阻的另一端、所述第十二电阻的一端和所述第四电容的一端均与所述第四三极管的基极连接，所述第四三极管的发射极、所述第四电容的另一端和所述第十二电阻的另一端均接地，所述第四三极管的集电极与所述第十三电阻的一端连接，所述第十三电阻的另一端与所述第十四电阻的一端连接，所述第十四电阻的另一端与所述第十五电阻的一端、所述第七电容的一端、所述第六电容的一端、所述第五电容的一端和所述第十八电阻的一端连接，所述第十七电阻的一端、所述第八电容的一端和所述第二十电阻的一端均与所述第五电容的一端连接，所述稳压器的第1脚与所述第十八电阻的一端连接，所述第六电容的另一端与所述第二十二电阻的一端连接，所述第二十二电阻的另一端、所述第二十三电阻的一端、所述第九电容的一端、所述第七电容的另一端和所述稳压器的第2脚均与所述第三光电耦合器的第2脚连接，所述第五电容的另一端与所述第十六电阻的 一端连接，所述第十六电阻的另一端和所述第十七电阻的另一端均接电，所述第八电容的另一端与所述第十九电阻的一端连接，所述第十九电阻的另一端、所述第二十电阻的另一端和所述第二十一电阻的一端均接电，所述第二十一电阻的另一端、所述第二十三电阻的一端和所述第三光电耦合器的第1脚均与OVP_1信号端连接，所述第十五电阻的另一端、所述第十八电阻的另一端、所述第九电容的另一端和所述稳压器的第3脚均接地，所述第三光电耦合器的第3脚和所述第二稳压二极管的正极均接地，所述第三光电耦合器的第4脚和所述第二稳压二极管的负极与FB_2信号端连接。
  10. 根据权利要求5所述的MINI LED驱动电源，其中，所述转换子单元包括集成在同一半导体芯片封装中的无桥PFC电路和辅路LLC电路以及辅路LLC变压器，所述无桥PFC电路在启动后输出高压直流电至所述辅路LLC电路，由所述辅路LLC电路控制所述LLC变压器启动之后，由所述辅路LLC变压器将高压直流电转换成所述第一电压和所述第二电压给所述主板供电。
  11. 根据权利要求10所述的MINI LED驱动电源，其中，所述无桥PFC电路还将高压直流电输出给所述第二转换模块，以便于所述第二转换模块中的所述主路LLC变压器输出所述第三电压给MINI LED屏供电。
  12. 根据权利要求10所述的MINI LED驱动电源，其中，所述半导体芯片的型号为U_MD6751。
  13. 根据权利要求5所述的MINI LED驱动电源，其中，所述供电子单元包括第五二极管、第六二极管、第三稳压二极管、第二十四电阻、第二十五电阻、第二十六电阻、第二十七电阻、第二十八电阻、第二十九电阻、第三十电阻、第十电容、第十一电容、第十二电容、第十三电容、第十四电容、第五三极管、第六三极管和第七三极管；
    所述第二十四电阻的另一端与所述第五三极管的集电极、所述第二十五电阻的一端和所述第十电容的一端连接，所述第十电容的另一端和所述第五二极管的负极接地，所述第五二极管的正极与所述第三稳压二极管的正极连接，所述第三稳压二极管的负极、所述第二十五电阻的另一端和所述第二十六电阻的一端均与所述第五三极管的基极连接，所述第二十六电阻的另一端、所述第五三极管的发射极均与所述第二十七电阻的一端、所述第十 一电容的一端和所述第七三极管的发射极连接，所述第十一电容的另一端、所述第六三极管的发射极、所述第二十九电阻的一端和所述第十二电容的一端均接地，所述第二十七电阻的另一端和所述第二十八电阻的一端均与所述第七三极管的基极连接，所述第二十八电阻的另一端与所述第六三极管的集电极连接，所述第二十六电阻的另一端、所述第十二电容的另一端和所述第三十电阻的一端均与所述第六三极管的基极连接，所述第七三极管的集电极和所述第十三电容的一端连接所述第六二极管的正极，所述第六二极管的负极和所述第十四电容的一端均连接所述第一电源输出端，所述第十四电容的另一端接地，所述第十三电容的另一端接地，所述第三十电阻的另一端连接所述转换子单元。
  14. 根据权利要求13所述的MINI LED驱动电源，其中，所述第三十电阻的所述另一端连接VCC2_CTRL信号端，当所述转换子单元工作之后所述转换子单元控制所述VCC2_CTRL信号端为高电平，使得所述第六三极管和第七三极管导通，进而输出第一电源至所述使能切换单元，为所述使能切换单元的工作提供电能。
  15. 一种MINI LED电视，其中，包括如权利要求1-14任意一项所述的MINI LED驱动电源。
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