WO2015139437A1 - 一种oled驱动电源装置 - Google Patents

一种oled驱动电源装置 Download PDF

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Publication number
WO2015139437A1
WO2015139437A1 PCT/CN2014/087027 CN2014087027W WO2015139437A1 WO 2015139437 A1 WO2015139437 A1 WO 2015139437A1 CN 2014087027 W CN2014087027 W CN 2014087027W WO 2015139437 A1 WO2015139437 A1 WO 2015139437A1
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WIPO (PCT)
Prior art keywords
circuit
resistor
power
conversion module
main board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2014/087027
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English (en)
French (fr)
Inventor
戴奇峰
巢铁牛
蔡胜平
徐辉
韦宗旺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Skyworth RGB Electronics Co Ltd
Original Assignee
Shenzhen Skyworth RGB Electronics Co Ltd
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Publication date
Application filed by Shenzhen Skyworth RGB Electronics Co Ltd filed Critical Shenzhen Skyworth RGB Electronics Co Ltd
Priority to US14/770,051 priority Critical patent/US9603219B2/en
Priority to AU2014379985A priority patent/AU2014379985B2/en
Publication of WO2015139437A1 publication Critical patent/WO2015139437A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G09G3/22—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]
    • G09G3/3208—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] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/2003—Display of colours
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • 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]
    • H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/16—Controlling the light source by timing means
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—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

Definitions

  • the present invention relates to the field of power supply technologies, and in particular, to an OLED driving power supply device.
  • the existing OLED organic light emitting diode
  • OLED organic light emitting diode
  • LCD Liquid Crystal Display
  • LED Light-Emitting Diode
  • OLED is different from traditional LCD display. Because OLED adopts very thin organic material coating and glass substrate, no backlight is needed, no color filter and liquid crystal are needed, and when there is current, organic material (ie organic film) It will shine. Therefore, in recent years, OLED has rapidly become a hot spot for research by major display manufacturers around the world.
  • OLED-based display devices such as televisions, monitors, projectors, etc.
  • LCD or LED a stable and high-efficiency power module will be a key factor in the stable operation of OLED display devices and their practical value.
  • the power supply architecture used is also different, usually the power output is +12V voltage and +24V voltage. +12V voltage and +24V voltage on the traditional power supply board
  • the replacement output shares a transformer.
  • the different windings of the same transformer in Figure 1 output +12V and +24V respectively.
  • the same transformer outputs +24V to the same winding and draws +12V from the center.
  • the external input switch motor signal ON/OFF controls the PWM controller to start, converting the rectified DC (ie, the inputs in Figures 1, 2) through the transformer to a +12V voltage and a +24V voltage output.
  • OLED based displays have a faster response speed than other display schemes.
  • the +12V voltage is consistent with the +24V voltage when switching on and off, as shown in Figure 3.
  • the conversion of +12V voltage and +24V voltage will be turned on or off at the same time.
  • the +12V voltage, +24V voltage and the on/off signal ON/OFF rise simultaneously (phase When it is turned on); at time T2, the +12V voltage, +24V voltage and the on/off signal ON/OFF decrease simultaneously (equivalent to turn off).
  • the impact of the fast response characteristics of OLEDs can lead to unpredictable faults such as flower screens, so traditional power solutions are difficult to meet the requirements of OLEDs.
  • an object of the present invention is to provide an OLED driving power supply device, which solves the problem that when the OLED display is used, the existing power supply architecture sharing transformer causes the output to be unstable, and the switching machine timing is simultaneously broken to cause the flower screen. problem.
  • An OLED driving power supply device includes a power board connected to a main board and an OLED screen, wherein the power board includes: a standby circuit, a timing control module, a first conversion module, a second conversion module, and a PFC circuit;
  • the standby circuit is configured to supply power to the main board and the timing control module after the power is turned on; the timing control module starts the PFC circuit according to the switch signal fed back by the main board, and the PFC circuit outputs the high voltage direct current to the timing control module, the first conversion module, and a second conversion module; the timing control module starts the first conversion module and the second conversion module according to the high voltage direct current and the enable signal outputted by the PFC circuit, and the first conversion module converts the high voltage direct current into the first voltage to supply power to the main board, and the second conversion module
  • the method is used for converting the high voltage direct current into the second voltage to supply power to the main board and the OLED screen; the timing control module also controls the start timing of the first conversion module and the second conversion module, so that the switch signal and the enable signal are simultaneously stabilized and then the OLED is turned on. Screen.
  • the timing control module includes:
  • the switch timing control circuit is configured to output a first power source to start the PFC circuit according to the switch signal fed back by the main board, and supply the second power source according to the high voltage direct current output of the PFC circuit to the enable control circuit and the first conversion module;
  • the control circuit is configured to output a third power supply to the second conversion module according to the enable signal fed back by the main board;
  • the switch timing control circuit is connected to the PFC circuit, the enable control circuit, the first conversion module and the main board, and the enable control circuit is connected to the second conversion module.
  • the first conversion module includes:
  • a first PWM controller configured to start the first transformer according to the second power output of the switching timing control circuit
  • a first transformer configured to convert a high voltage direct current outputted by the PFC circuit into a first voltage, and output the power to the main board;
  • the first transformer is connected to the first PWM controller and the main board, and the first PWM controller is connected to the timing control module.
  • the second conversion module includes:
  • a second PWM controller configured to start the second transformer according to the third power output of the enable control circuit
  • a second transformer configured to convert the high voltage direct current outputted by the PFC circuit into a second voltage, and output the power to the main board;
  • the second transformer is connected to the second PWM controller and the main board, and the second PWM controller is connected to the timing control module.
  • the standby circuit is also used to turn on the power
  • the output operating voltage is output to the switch timing control circuit;
  • the switch timing control circuit includes:
  • a first power control sub-circuit configured to convert the operating voltage outputted by the standby circuit to the first power source according to the switch signal fed back by the main board to start the PFC circuit;
  • a second power control sub-circuit configured to convert the working voltage into a second power supply according to the high-voltage direct current output after the PFC circuit is started, to supply power to the enable control circuit and the first conversion module;
  • the first power control sub-circuit is connected to the standby circuit, the main board, the PFC circuit and the second power control sub-circuit, and the second power control sub-circuit is connected to the PFC circuit, the enable control circuit and the first conversion module.
  • the first power control sub-circuit includes: a first triode, a second triode, a third triode, a first optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode and a second diode; a base of the first transistor is connected to the main board, an emitter of the first transistor is grounded, and a set of the first triode
  • the electrode is connected to the second leg of the first optocoupler, the first leg of the first optocoupler is connected to the standby circuit, and the fourth leg of the first optocoupler is connected to the collector of the standby circuit and the second triode, the first optocoupler
  • the third leg is connected to one end of the first resistor, and the other end of the first resistor is connected to the base of the second transistor, the cathode of the first diode, and is also grounded through the second resistor, the first diode
  • the anode of the tube is grounded, the emitting of
  • the second power control sub-circuit includes: a fourth triode, a shunt reference source, and a voltage dividing resistor group; a base of the fourth triode is connected to a cathode of the shunt reference source, and a collector connection enable control circuit of the fourth triode And a control pole of the shunt reference source, the emitter of the fourth triode is connected to the first power control sub-circuit, the anode of the shunt reference source is grounded, the first end of the voltage dividing resistor group is connected to the PFC circuit, and the voltage dividing resistor The second end of the group is connected to the control pole of the shunt reference source, and the third end of the voltage dividing resistor group is grounded.
  • the first power control sub-circuit further includes a third diode, a fifth resistor, a sixth resistor, a first capacitor, and a seventh resistor; and a positive pole of the third diode Connecting the main board, the negative pole of the third diode is connected to one end of the fifth resistor, the other end of the fifth resistor is connected to the base of the first triode, and is also grounded through a sixth resistor, and the first capacitor is connected in parallel with the sixth resistor
  • the seventh resistor is connected between the standby circuit and the first leg of the first photocoupler.
  • the second power control sub-circuit further includes an eighth resistor and a ninth resistor; one end of the eighth resistor is connected to the emitter of the fourth transistor, and the other end of the eighth resistor Connect the negative pole of the shunt reference source to one end of the ninth resistor, and the other end of the ninth resistor to the base of the fourth triode.
  • the second power control sub-circuit further includes a fourth diode, a tenth resistor, a fifth diode, and a fourth capacitor; and a negative connection of the fourth diode is
  • the control circuit and the first conversion module are connected, the anode of the fourth diode is connected to the collector of the fourth transistor, the anode of the fifth diode is also connected through the tenth resistor, and the cathode of the fifth diode is connected to the shunt reference.
  • the control pole of the source, the fourth capacitor is connected between the control pole of the shunt reference source and the ground.
  • the second power control sub-circuit further includes a fifth capacitor, an eleventh resistor, and a sixth diode; and the fifth capacitor is connected to the second end of the voltage dividing resistor group, The negative pole of the six diode is connected to the control pole of the shunt reference source, and the anode of the sixth diode is connected to the second end of the voltage dividing resistor group through the eleventh resistor.
  • the enabling control circuit includes a fifth triode, a sixth triode, a second optocoupler, a twelfth resistor, a thirteenth resistor, and a seventh diode;
  • the base of the fifth triode is connected to the main board, the emitter of the fifth triode is grounded, the collector of the fifth triode is connected to the second leg of the second optocoupler, and the first leg of the second optocoupler Connecting the standby circuit, the fourth pin of the second optocoupler is connected to the collector of the second power control sub-circuit and the sixth transistor, and the third leg of the second optocoupler is connected to one end of the twelfth resistor, the twelfth The other end of the resistor is connected to the base of the sixth triode, the cathode of the seventh diode, and is also grounded through the thirteenth resistor, the anode of the seventh diode is grounded, and the sixth transistor is emitted.
  • the pole is connected to the second
  • the OLED driving power supply device converts high voltage direct current into a first voltage to supply power to the main board through the first conversion module, and converts the high voltage direct current into a second voltage through the second conversion module to the main board and the OLED.
  • the screen power supply makes the first voltage and the second voltage independent of each other, avoids the situation that the existing power supply architecture shares the transformer and causes the mutual interference and influence of the lines, satisfies the requirements of the OLED on the output stability of the power supply, and improves the image quality effect of the OLED;
  • the timing control module controls the startup timing of the first conversion module and the second conversion module, so that the switch signal and the enable signal are simultaneously stabilized, then the OLED screen is illuminated, and the switching timing of the conventional power supply is changed, so that the power supply can adapt.
  • the OLED fast response feature solves the problem that the existing switch timing is turned on or off at the same time. The problem.
  • FIG. 1 is a schematic diagram showing output voltages of different windings of the same transformer in a conventional power supply architecture
  • FIG. 2 is a schematic diagram of the output voltage of the same winding of the same transformer in the existing power supply architecture
  • FIG. 3 is a timing diagram of a power switch in an existing power supply architecture
  • FIG. 4 is a schematic diagram of an application embodiment of an OLED driving power supply device according to an embodiment of the present invention.
  • FIG. 5 is a structural block diagram of a preferred embodiment of a power board according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a pin of a socket connected between a power board and a main board according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a pin of a socket connected between a power board and an OLED screen according to an embodiment of the present invention.
  • FIG. 8 is a circuit diagram of a switch timing control circuit according to an embodiment of the present invention.
  • FIG. 9 is a circuit diagram of an enable control circuit according to an embodiment of the present invention.
  • FIG. 10 is a timing diagram of a switch of an OLED driving power supply device according to an embodiment of the present invention.
  • the present invention provides an OLED driving power supply device.
  • the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
  • the OLED driving power supply device provided by the invention is suitable for a power supply driving in a display field such as a television, a monitor, an audio-visual, a rear projection, a plasma display or the like using an OLED (Organic Light Emitting Diode) as a display scheme.
  • the OLED driving power supply device provided by the present invention includes a power board 10 connected to the main board 20 and the OLED panel 30.
  • the power board 10 includes a standby circuit 110, a timing control module 120, a first conversion module 130, a second conversion module 140, and a PFC circuit 150.
  • the standby circuit 110 is connected to the timing control module 120 and the main board 20.
  • the power supply voltage (5V in this embodiment) is outputted to the CPU of the main board 20 and the timing control module 120 to supply power to the CPU.
  • the timing control module 120 is connected to the PFC circuit 150, the main board 20, the first conversion module 130, and the second conversion module 140.
  • the timing control module 120 starts the PFC circuit 150 according to the ON/OFF of the power-on/off signal fed back by the CPU.
  • the high voltage DC HV_DC is output to the timing control module, the first conversion module, and the second conversion module.
  • the timing control module 120 activates the first conversion module 130 and the second conversion module 130 according to the high voltage DC HV_DC and the enable signal ENA, and controls the startup timing of the first conversion module 130 and the second conversion module 140 to turn the switch signal ON/OFF.
  • the OLED screen is illuminated after the enable signal ENA is stabilized at the same time.
  • the first conversion module 130 and the second conversion module 140 are connected to the main board 20 and the PFC circuit 150. After the first conversion module 130 is started, the high voltage direct current HV_DC is converted into a first voltage (in this embodiment, a voltage of +12V). The motherboard 20 is powered. After the second conversion module 140 is started, the high voltage direct current HV_DC is converted into a second voltage (+20V in this embodiment) to supply power to the main board 20 and the OLED panel 30.
  • the timing control module 120 includes a switch timing control circuit 121 and an enable control circuit 122.
  • the switch timing control circuit 121 is connected to the PFC circuit 150, the enable control circuit 122, the first conversion module 130, and the main board 20.
  • the enable control circuit 122 is connected to the second conversion module 140.
  • the switch timing control circuit 121 activates the PFC circuit 150 according to the switch power signal ON/OFF outputted by the main board, and outputs the second power source VCC1 to the enable control circuit 122 and the first conversion module according to the high voltage DC HV_DC outputted by the PFC circuit 150. 130 power supply.
  • the enable control circuit 122 outputs the third power supply 20V_VCC to the second conversion module 140 according to the enable signal ENA fed back from the main board.
  • the standby circuit further outputs an operating voltage (about 25V) to the switch timing control circuit after the power is turned on to provide a conversion power of the first power source PFC_VCC and the second power source VCC1.
  • the switch timing control circuit specifically includes: a first power control sub-circuit 1211 and a second power control sub-circuit 1212.
  • the first power control sub-circuit 1211 is connected to the standby circuit 110, the main board, the PFC circuit 150, and the second power control sub-circuit 1212.
  • the second power control sub-circuit 1212 is connected to the PFC circuit 150, the enable control circuit 122, and the first Conversion module 1211.
  • the first power control sub-circuit 1211 converts the operating voltage VCC output by the standby circuit 110 into the first power source PFC_VCC according to the switch signal fed back from the main board to activate the PFC circuit 150.
  • the second power control sub-circuit 1212 is output after being activated according to the PFC circuit 150.
  • the high voltage DC HV_DC converts the operating voltage VCC into a second power source VCC1 to supply power to the enable control circuit and the first conversion module.
  • the embodiment uses an independent transformer and an independent PWM controller to convert the high voltage direct current into an independent +12V voltage and a +20V voltage output.
  • the first conversion module 130 includes a first PWM controller 131 and a first transformer 132
  • the second conversion module 140 includes a second PWM controller 141 and a second transformer 142.
  • the first PWM controller 131 is connected to the timing control module, and activates the first transformer 132 according to the second power source VCC1 outputted by the switch timing control circuit; the first transformer 132 is connected to the first PWM controller 131 and the main board, which outputs the PFC circuit.
  • the high voltage DC HV_DC is converted into a first voltage (ie, +12V), and the output is supplied to the motherboard.
  • the second PWM controller 141 is connected to the timing control module, which activates the second transformer 142 according to the third power source 20V_VCC outputted by the enable control circuit; the second transformer 142 is connected to the second PWM controller and the main board, which will connect the PFC circuit
  • the output high-voltage DC HV_DC is converted into a second voltage (ie, +20V), and the output is supplied to the main board.
  • an independent transformer is used to respectively output a first voltage (ie, +12V) and a second voltage (ie, +20V) for power supply.
  • the +12V and +20V are independent from each other at the root, and the two outputs and the PWM control are independent. Normal operation does not affect each other, thus avoiding interference between the two voltages.
  • the output of the two voltages is completely separated, when the single load changes, the voltage output of the other circuit is not affected, thereby further ensuring the stability of the normal operation of the system.
  • the organic film itself is driven by current to emit light, and the change of current causes the color of the picture. The change.
  • the output of the first voltage and the second voltage on the power board are independent of each other, so that the whole machine is stable and normal during operation, effectively improving the electrical performance of the product, improving the image quality experience of the OLED TV, and delaying the use of the OLED screen. life.
  • the standby circuit 110, the PFC circuit 150, the first PWM controller 131, and the second PWM controller 141 are all prior art, and the specific circuit structure thereof will not be described in detail herein.
  • the display part of the TV set in actual application is composed of a power board, a main board, a TO-CON board, and a sub board (the constant current board is also included in the LED TV).
  • the voltage and current required for the normal operation of these boards are provided by the power board.
  • Different boards have different functions and different power requirements.
  • Power consumption of the power board, main board, and screen body varies according to the size. Taking a 55-inch OLED TV as an example, the voltage supplied by the power board to the motherboard is +5V, +12V, and +20V, and the power board is directed to the OLED screen.
  • the body provides a voltage of +20V and a maximum current of about 10A.
  • a matching first socket is disposed on the power board 10 and the main board 20, and is connected to the first socket through a USB data line for connection.
  • the first socket pin is as shown in FIG. 6. 4 and FIG. 6, it can be concluded that the data exchanged between the power board 10 and the main board 20 includes: an enable signal ENA, a switch signal ON/OFF, a 5V power supply voltage, a +12V first voltage, and a +20V. The second voltage and ground GND.
  • the power board 10 and the OLED screen 30 are also respectively provided with a matching second socket, which is inserted into the second socket through the USB data line for connection.
  • the second socket pin is as shown in FIG. 7. Referring to FIG. 4 and FIG.
  • the data exchanged between the power board 10 and the OLED screen includes: a second voltage of +20V and a ground GND.
  • the OLED screen is illuminated by a second voltage of +20V.
  • the main board 20 and the OLED screen are also connected through a socket and a USB data line.
  • the main board 20 transmits a first voltage of +12 V to supply power to the relevant control circuit of the OLED screen, and controls the content display of the OLED screen through the data Data.
  • the socket pins can be appropriately increased or decreased, which is subject to the actual voltage requirements.
  • the power-on/off timing of the power supply is also adjusted by the power-on/off signal and the enable signal ENA fed back by the CPU on the main board.
  • the OLED screen is illuminated only when the switch signal ON/OFF and the enable signal ENA are simultaneously turned on, so that the OLED driving power supply device provided by the embodiment can meet the timing requirements of the OLED screen.
  • the switch timing is adjusted by the switch timing control circuit and the enable control circuit.
  • the first power control sub-circuit 1211 includes: a first transistor Q1, a second transistor Q2, a third transistor Q3, and a first photocoupler U1.
  • the first power control sub-circuit 1212 includes a fourth transistor Q4, a shunt reference source T, and a voltage dividing resistor group 1210.
  • the base of the first transistor Q1 is connected to the main board (for inputting the switch signal ON/OFF), the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to the first optocoupler
  • the second leg of U1 ie, the negative pole of the LED
  • the first leg of the first optocoupler U1 ie, the anode of the LED
  • the fourth leg ie, the collector of the phototransistor
  • the third leg of the first photocoupler U1 ie, the emitter of the phototransistor
  • the other end of the first resistor R1 is connected to the base of the second transistor Q2, the cathode of the first diode D1, and is also open
  • the second resistor R2 is grounded, the anode of the first diode D1 is grounded, the emitter of the second transistor Q2 is connected to the collector of the third transistor Q3, one end of the third resistor R3, and the fourth The emitter of the transistor Q4, the other end of the third resistor R3 is connected to the base of the third transistor Q3, the cathode of the second diode D2, and is also grounded through the fourth resistor R4, the second two
  • the anode of the pole tube D2 is grounded, the emitter of the third transistor Q3 is connected to the PFC circuit (for outputting the first power source PFC_VCC), and the base of the fourth transistor Q4 is connected to the cathode K of the shunt reference source T,
  • the collector of the four transistor Q4 is connected to the control circuit, the first conversion module, and the control electrode VRE of the
  • the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all NPN transistors, and the fourth transistor Q4 is a PNP transistor.
  • the first diode D1 and the second diode D2 are Zener diodes that can protect the second transistor Q2 and the third transistor Q3.
  • the shunt reference source T is of the type TL431 and has a turn-on voltage of 2.5V.
  • the model of the first photocoupler U1 is PC817.
  • the voltage dividing resistor group 1210 is composed of a plurality of series resistors.
  • the first voltage dividing resistor Ra, the second voltage dividing resistor Rb, the third voltage dividing resistor Rc, and the fourth voltage dividing resistor Rd are sequentially connected in series.
  • the fifth voltage dividing resistor Re is sequentially connected in series.
  • One end of the first voltage dividing resistor Ra (corresponding to the first end of the voltage dividing resistor group 1210) is connected to a PFC circuit for inputting a high voltage DC HV_DC, and one end of the fifth voltage dividing resistor Re (corresponding to the voltage dividing resistor group 1210) Third
  • the connection point of the fourth voltage dividing resistor Rd and the fifth voltage dividing resistor Re (corresponding to the second end of the voltage dividing resistor group 1210) is connected to the control electrode VRE of the shunt reference source T.
  • the first power control sub-circuit 1211 further includes a filter voltage dividing circuit composed of a third diode D3, a fifth resistor R5, a sixth resistor R6, and a first capacitor C1, and a current limiting circuit.
  • the seventh resistor R7 The anode of the third diode D3 is connected to the main board, the cathode of the third diode D3 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the base of the first transistor Q1.
  • the sixth resistor R6 is grounded, and the first capacitor C1 is connected in parallel with the sixth resistor R6.
  • the partial voltage of the fifth resistor R5 and the sixth resistor R6 is the turn-on voltage at the base of the first transistor Q1, which determines the conduction state of the first transistor Q1, and the first capacitor C1 is opposite to the guide.
  • the pass voltage is smoothed and filtered to improve the stability of the on state.
  • the seventh resistor R7 is connected between the standby circuit and the first leg of the first photocoupler U1.
  • the switch timing control circuit further includes two polar capacitors, that is, a second capacitor C2 and a third capacitor C3, and the anode of the second capacitor C2 is connected to the second transistor Q2.
  • the emitter, the cathode of the second capacitor C2 is grounded; the anode of the third capacitor is connected to the emitter of the third transistor Q3, and the cathode of the third capacitor C3 is grounded.
  • the second power control sub-circuit 1212 further includes an eighth resistor R8 and a ninth resistor R9 for setting a bias voltage and adjusting an on state of the fourth transistor Q4.
  • One end of the eighth resistor R8 is connected to the emitter of the fourth transistor Q4, and the eighth power
  • the other end of the resistor R8 is connected to one end of the negative electrode K of the shunt reference source T and the ninth resistor R9, and the other end of the ninth resistor R9 is connected to the base of the fourth transistor Q4.
  • the group value of the eighth resistor R8 and the ninth resistor R9 determines the voltage value of the second power source VCC1.
  • the second power control sub-circuit 1212 further includes a fourth diode D4 for blocking and filtering, for performing the feedback control to divide the reference source T continuously.
  • the cathode of the fourth diode D4 is connected to the enable control circuit and the first conversion module, and the anode of the fourth diode D4 is connected to the collector of the fourth transistor Q4, and is also connected through the tenth resistor R10.
  • the anode of the pole D5, the cathode of the fifth diode D5 is connected to the gate VRE of the shunt reference source T, and the fourth capacitor C4 is connected between the gate VRE of the shunt reference source T and the ground.
  • the second power control sub-circuit 1212 further includes a fifth capacitor C5 for filtering, an eleventh resistor R11 for current limiting, and a sixth for alternating current. Diode D6.
  • the fifth capacitor C5 is connected to the second end of the voltage dividing resistor group (ie, in parallel with the fifth voltage dividing resistor Re), and the cathode of the sixth diode D6 is connected to the control electrode VRE of the shunt reference source T, the sixth diode
  • the positive electrode of D6 is connected to the second end of the voltage dividing resistor group 1210 through the eleventh resistor R11.
  • the enable control circuit includes a fifth transistor Q5, a sixth transistor Q6, a second photocoupler U2, a twelfth resistor R12, a thirteenth resistor R13, and a seventh diode. D7; the base of the fifth transistor Q5 is connected to the main board (for input enable signal ENA), the emitter of the fifth transistor Q5 is grounded, and the collector of the fifth transistor Q5 is connected to the second optocoupler
  • the second leg of U2 ie, the negative pole of the LED
  • the first leg of the second photocoupler U2 ie, the positive pole of the LED
  • the fourth pin of the second optocoupler U2 ie, the collector of the phototransistor
  • the collector of the transistor Q6 the third leg of the second photocoupler U2 (ie, the emitter of the phototransistor) is connected to one end of the twelfth
  • the fifth transistor Q5 and the sixth transistor Q6 are both NPN transistors.
  • the seventh diode D7 is a Zener diode and can protect the sixth transistor Q6. Adjusting the resistance values of the twelfth resistor R12 and the thirteenth resistor R13 can affect the conduction state of the sixth transistor Q6, thereby controlling the voltage value of the third power source 20V_VCC.
  • the enable control circuit further includes an eighth diode D8, a fourteenth resistor R14, a fifteenth resistor R15 and a sixth capacitor C6.
  • the anode of the eighth diode D8 is connected to the main board (for input enable signal ENA), the cathode of the eighth diode D8 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the fifth.
  • the base of the transistor Q5 is also grounded through a fifteenth resistor R15, which is connected in parallel with the fifteenth resistor R15.
  • the divided voltage of the fourteenth resistor R14 and the fifteenth resistor R15 is the turn-on voltage of the fifth transistor Q5, which determines the conduction state of the fifth transistor Q5, and the sixth capacitor C6 is turned on.
  • the voltage is smoothed and filtered to improve the stability of the on state.
  • the standby circuit 110 After the external power is externally connected to the OLED driving power supply device, the standby circuit 110 outputs a power supply voltage of +5 V to supply power to the CPU of the main board and the first leg of the first photocoupler U1. At the same time, the standby circuit 110 also outputs an operating voltage VCC (about 25 V) to supply power to the collectors of the fourth pin and the second transistor Q2 of the first photocoupler U1.
  • VCC about 25 V
  • the switch timing control circuit of the power board is provided with a switch signal ON/OFF (active high, equivalent to the start signal), so that the first transistor Q1 is saturated and turned on.
  • the conduction amount of the first photocoupler U1 is increased, the phototransistor is turned on to increase the base voltage of the second transistor Q2, and the second transistor Q2 is turned on to make the base of the third transistor Q3 As the voltage rises, the third transistor Q3 is also saturated.
  • the working voltage VCC is sequentially stepped down by the second transistor Q2 and the third transistor Q3, and then the first power source PFC_VCC is output to supply power to the PFC circuit.
  • the PFC circuit of the power board starts to work, and a high voltage DC HV_DC (higher than 380V) is generated and fed back to the first end of the voltage dividing resistor group 1210.
  • the high voltage DC HV_DC is divided by the voltage dividing resistor group 1210 to a voltage higher than 2.5V to the control pole VRE of the shunt reference source T, and the shunt reference source T is turned on to make the base of the fourth triode Q4 extremely low, fourth Transistor Q4 is turned on.
  • the working voltage VCC is sequentially stepped down by the second transistor Q2 and the fourth transistor Q4, and then the second power source VCC1 is output to the first conversion module, and the first conversion module converts the second power source VCC1 into a first voltage of +12V.
  • ENA active high, equivalent to the dot screen
  • the enable control circuit of the power supply board receives the enable signal ENA
  • the fifth transistor Q5 is turned on, the conduction amount of the second photocoupler U2 is increased, and the base voltage of the sixth transistor Q6 is increased.
  • Transistor Q6 is saturated and conducting.
  • the second power source VCC1 passes through the sixth triode
  • the third power supply 20V_VCC is output to the second conversion module, and the second conversion module converts the third power supply 20V_VCC into a second voltage of +20V to supply power to the main board and the OLED panel.
  • the OLED screen will be illuminated at this time.
  • the motherboard also delivers a second voltage of +20V to the power amplifier circuit (this is a prior art and will not be described in detail herein).
  • the first transistor Q1 When the switch signal ON/OFF is low (equivalent to the shutdown signal), the first transistor Q1 is turned off to turn off the first photocoupler U1, and the second transistor Q2 and the third transistor Q3 are turned off sequentially.
  • the PFC circuit stops working, then no high voltage DC HV_DC is generated, the fourth transistor Q4 is also cut off, no second power supply VCC1 is output, and the first conversion module stops working, resulting in no first voltage output.
  • the enable signal ENA When the enable signal ENA is at a low level (equivalent to a screen off), the fifth transistor Q5 is turned off to turn off the second photocoupler U2, and the sixth transistor Q6 is also turned off.
  • the third power supply 20V_VCC becomes a low level, so that the second conversion module stops working, and the second voltage without +20V supplies power to the OLED screen, and the OLED screen is turned off.
  • FIG. 1 A schematic diagram of the timing of the switching machine obtained after performing circuit simulation on the OLED driving power supply device is shown in FIG.
  • the first conversion module 130 is controlled to output a first voltage of +12 V to the main board 20.
  • the main board 20 starts to work, and after the T2 time, the main board 20 sends the data Data to the OLED screen 30. Since there is no second voltage of +20V at this time, the OLED screen is not lit yet.
  • the main board 20 feeds back the enable signal ENA to the power board 10.
  • the second converter module 140 is controlled to output a second voltage of +20V to the main board and the OLED screen. After the time of T4, the second voltage reaches a stable output, OLED The screen is lit and the data display screen is recognized. The voltage is turned on from +12V to +20V and is turned on for at least 36ms (T1+T2+T3+T4).
  • the main board When the power is turned off, the main board sends a low level enable signal ENA (equivalent to the off signal) to the power board, the power board stops outputting the second voltage of +20V, and the OLED screen is turned off.
  • ENA low level enable signal
  • the main board 20 emits a low-level switch signal ON/OFF (low level is equivalent to the shutdown signal), and the power board stops outputting the first voltage of +12V, and the whole machine enters the standby state.
  • the T6 time is not less than 30 ms. In this way, the OLED screen and the motherboard are not simultaneously turned on, and the problem of the flower screen is avoided.
  • the OLED driving power supply device provided by the present invention, after the AC power supply is connected, firstly outputs a 5V power supply voltage to the CPU of the main board by the standby circuit of the power supply board, and the feedback switch machine signal is turned ON/OFF after the CPU works normally.
  • the switching timing control circuit of the power board outputs the first power source PFC_VCC to start the PFC circuit, and the high voltage DC outputted by the PFC circuit causes the switching timing control circuit to output the second power source VCC1 to perform the +12V voltage conversion to the first conversion module, and simultaneously to enable the control circuit.
  • Power supply after the power board outputs +12V voltage to the motherboard, the main board then feedbacks the enable signal ENA to the enable control circuit, so that it outputs the third power supply 20V_VCC to the second conversion module for +20V voltage conversion, and the power board outputs +20V voltage point.
  • the enable signal ENA to the enable control circuit
  • the two voltage outputs and the control are independent of each other, and do not affect each other, thereby avoiding the prior art sharing.
  • the transformer causes interference between the two voltages.
  • the output of the two voltages is completely separated, when the single load changes, the voltage output of the other circuit is not affected, so that the whole machine is stable and normal during operation. Effectively improve the electrical performance of the product, improve the image quality experience of OLED TV, and delay the service life of OLED screen.
  • the invention outputs the +20V voltage to simultaneously illuminate the OLED screen after the shutdown signal and the enable signal are simultaneously stabilized, and changes the timing of the switching of the conventional power supply, so that the power supply can adapt to the fast response characteristics of the OLED, and solves the existing switching sequence.
  • the break causes the problem of the flower screen.

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Abstract

本发明公开了一种OLED驱动电源装置，包括与主板和OLED屏连接的电源板，电源板包括待机电路、时序控制模块、第一转换模块、第二转换模块和PFC电路，待机电路连接时序控制模块和主板，时序控制模块连接PFC电路、主板、第一转换模块和第二转换模块，第一转换模块和第二转换模块均连接主板和PFC电路。本发明通过第一转换模块、第二转换模块分别将高压直流转换成第一电压、第二电压给主板和OLED屏供电，使第一电压和第二电压相互独立，满足了OLED对电源输出稳定性的要求，提高其画质效果；时序控制模块使开关机信号和使能信号同时稳定后才点亮OLED屏，改变了传统电源的开关机时序，使电源能够适应OLED快响应特性。

Description

一种OLED驱动电源装置 技术领域
本发明涉及电源技术领域，特别涉及一种OLED驱动电源装置。
背景技术
现有的OLED(organic light emitting diode，有机发光二极管)具有自发光、结构简单、超轻薄、宽视角、低功耗及可实现柔性显示等特性，在画质、响应速度、功耗、厚度及可视角度等方面都优于传统的LCD(Liquid Crystal Display，液晶显示器)、LED(Light-Emitting Diode，发光二极管)。同时，OLED与传统的LCD显示方式不同，由于OLED采用非常薄的有机材料涂层和玻璃基板，无需背光灯，无需彩色滤光片及液晶，当有电流通过时，有机材料(即有机薄膜)就会发光。故而近年来OLED迅速成为全球各大显示厂商研究的热点。随着OLED技术的逐渐成熟，以OLED为主的显示设备(如电视机、监视器、投影仪等)将逐步取代传统的LCD或LED。而一款性能稳定，高效率的电源模块，将是OLED显示设备能否稳定工作，体现其实用价值的关键性因素。
以智能电视为例，现有的智能电视机的电源设计中，根据屏幕的尺寸及整机功耗不同，采用的电源架构也不尽相同，通常电源输出+12V电压和+24V电压。传统的电源板上+12V电压与+24V电压的转 换输出共用一个变压器，例如图1中同一变压器的不同绕组分别输出+12V电压和+24V电压。图2中同一变压器同一绕组输出+24V电压，并从中心抽出+12V电压。外部输入开关机信号ON/OFF控制PWM控制器启动，将整流后的直流(即图1、2中的输入)通过变压器转换成+12V电压和+24V电压输出。当大功率输出时，由于共用一个变压器，+12V电压与+24V电压之间会相互影响，使电源输出不稳定导致不可预知的结果，使得研发调试周期增长。同时，共用变压器的方案增加了调整电路的负担，使得电源板上损耗增加，降低输出效率，严重时甚至影响整机工作的稳定性，降低使用寿命。并且共用变压器的方案对变压器的工艺设计要求更为严格。由于OLED是通过电流驱动有机薄膜，使有机薄膜发光，OLED响应速度较之LED快了许多，在画面的色彩变化过程会导致电流的迅速变化，若是共用同一变压器，迅速变化的电流极有可能影响到+12V电压的输出，产生不可预知的结果，造成系统的稳定性下降，也给研发调试过程带来困难，延长开发周期；并且，电流的微小波动有可能影响OLED的显示效果甚至其使用寿命，因此，对电源的输出、特别是电流的稳定性就有更为苛刻的要求。
另外，基于OLED显示相对于其它显示方案，具有更快的响应速度。在传统的电源架构中，+12V电压与+24V电压在开关机时的时序一致，如图3所示。当给电源板一个开关机信号ON/OFF时，+12V电压与+24V电压的转换将同时打开或同时关断。如图3所示，在时间T1，+12V电压、+24V电压与开关机信号ON/OFF同时上升(相 当于打开)；在时间T2，+12V电压、+24V电压与开关机信号ON/OFF同时下降(相当于关断)。OLED的快响应特性的影响会导致出现花屏等不可预知的故障，因而传统的电源方案很难满足OLED的要求。
发明内容
鉴于上述现有技术的不足之处，本发明的目的在于提供一种OLED驱动电源装置，以解决采用OLED显示时，现有电源架构共用变压器导致输出不稳定、开关机时序同时开断导致花屏的问题。
为了达到上述目的，本发明采取了以下技术方案：
一种OLED驱动电源装置，包括与主板和OLED屏连接的电源板，其中，所述电源板包括：待机电路、时序控制模块、第一转换模块、第二转换模块和PFC电路；
所述待机电路用于接通电源后输出电源电压给主板和时序控制模块供电；时序控制模块根据主板反馈的开关机信号启动PFC电路，PFC电路输出高压直流给时序控制模块、第一转换模块和第二转换模块；时序控制模块根据PFC电路输出的高压直流、使能信号启动第一转换模块和第二转换模块，第一转换模块将高压直流转换成第一电压给主板供电，第二转换模块，用于将高压直流转换成第二电压给主板和OLED屏供电；时序控制模块还控制第一转换模块和第二转换模块的启动时序，使开关机信号和使能信号同时稳定后点亮OLED屏。
所述的OLED驱动电源装置中，所述时序控制模块包括：
开关时序控制电路，用于根据主板反馈的开关机信号输出第一电源启动PFC电路，根据PFC电路输出的高压直流输出第二电源给使能控制电路和第一转换模块供电；
使能控制电路，用于根据主板反馈的使能信号输出第三电源给第二转换模块供电；
所述开关时序控制电路连接PFC电路、使能控制电路、第一转换模块和主板，所述使能控制电路连接第二转换模块。
所述的OLED驱动电源装置中，所述第一转换模块包括：
第一PWM控制器，用于根据开关时序控制电路输出的第二电源启动第一变压器；
第一变压器，用于将PFC电路输出的高压直流转换成第一电压、输出给主板供电；
所述第一变压器连接第一PWM控制器和主板，所述第一PWM控制器连接时序控制模块。
所述的OLED驱动电源装置中，所述第二转换模块包括：
第二PWM控制器，用于根据使能控制电路输出的第三电源启动第二变压器；
第二变压器，用于将PFC电路输出的高压直流转换成第二电压、输出给主板供电；
第二变压器连接第二PWM控制器和主板，所述第二PWM控制器连接时序控制模块。
所述的OLED驱动电源装置中，所述待机电路还用于接通电源 后输出工作电压给开关时序控制电路；所述开关时序控制电路包括：
第一电源控制子电路，用于根据主板反馈的开关机信号将待机电路输出的工作电压转换为第一电源来启动PFC电路；
第二电源控制子电路，用于根据PFC电路启动后输出的高压直流将所述工作电压转换为第二电源给使能控制电路和第一转换模块供电；
所述第一电源控制子电路连接待机电路、主板、PFC电路和第二电源控制子电路，所述第二电源控制子电路连接PFC电路、使能控制电路和第一转换模块。
所述的OLED驱动电源装置中，所述第一电源控制子电路包括：第一三极管、第二三极管、第三三极管、第一光耦、第一电阻、第二电阻、第三电阻、第四电阻、第一二极管和第二二极管；所述第一三极管的基极连接主板，第一三极管的发射极接地，第一三极管的集电极连接第一光耦的第2脚，所述第一光耦的第1脚连接待机电路，第一光耦的第4脚连接待机电路和第二三极管的集电极，第一光耦的第3脚连接第一电阻的一端，所述第一电阻的另一端连接第二三极管的基极、第一二极管的负极、还通过第二电阻接地，所述第一二极管的正极接地，所述第二三极管的发射极连接第三三极管的集电极、第三电阻的一端和第二电源控制子电路，所述第三电阻的另一端连接第三三极管的基极、第二二极管的负极、还通过第四电阻接地，所述第二二极管的正极接地，第三三极管的发射极连接PFC电路。
所述的OLED驱动电源装置中，所述第二电源控制子电路包括： 第四三极管、分流基准源和分压电阻组；所述第四三极管的基极连接分流基准源的负极，第四三极管的集电极连接使能控制电路、第一转换模块和分流基准源的控制极，第四三极管的发射极连接第一电源控制子电路，所述分流基准源的正极接地，所述分压电阻组的第一端连接PFC电路，分压电阻组的第二端连接分流基准源的控制极，分压电阻组的第三端接地。
所述的OLED驱动电源装置中，所述第一电源控制子电路还包括第三二极管、第五电阻、第六电阻、第一电容和第七电阻；所述第三二极管的正极连接主板，第三二极管的负极连接第五电阻的一端，第五电阻的另一端连接第一三极管的基极、还通过第六电阻接地，所述第一电容与第六电阻并联，所述第七电阻连接在待机电路与第一光耦的第1脚之间。
所述的OLED驱动电源装置中，所述第二电源控制子电路还包括第八电阻和第九电阻；所述第八电阻的一端连接第四三极管的发射极，第八电阻的另一端连接分流基准源的负极与第九电阻的一端，第九电阻的另一端连接第四三极管的基极。
所述的OLED驱动电源装置中，所述第二电源控制子电路还包括第四二极管、第十电阻、第五二极管和第四电容；所述第四二极管的负极连接使能控制电路和第一转换模块，第四二极管的正极连接第四三极管的集电极、还通过第十电阻连接第五二极管的正极，第五二极管的负极连接分流基准源的控制极，第四电容连接在分流基准源的控制极与地之间。
所述的OLED驱动电源装置中，所述第二电源控制子电路还包括第五电容、第十一电阻和第六二极管；所述第五电容连接分压电阻组的第2端，第六二极管的负极连接分流基准源的控制极，第六二极管的正极通过第十一电阻连接分压电阻组的第2端。
所述的OLED驱动电源装置中，所述使能控制电路包括第五三极管、第六三极管、第二光耦、第十二电阻、第十三电阻和第七二极管；所述第五三极管的基极连接主板，第五三极管的发射极接地，第五三极管的集电极连接第二光耦的第2脚，所述第二光耦的第1脚连接待机电路，第二光耦的第4脚连接第二电源控制子电路和第六三极管的集电极，第二光耦的第3脚连接第十二电阻的一端，所述第十二电阻的另一端连接第六三极管的基极、第七二极管的负极、还通过第十三电阻接地，所述第七二极管的正极接地，所述第六三极管的发射极连接第二转换模块。
相较于现有技术，本发明提供的OLED驱动电源装置，通过第一转换模块将高压直流转换成第一电压给主板供电，通过第二转换模块将高压直流转换成第二电压给主板和OLED屏供电，使第一电压和第二电压相互独立，避免了现有电源架构共用变压器导致线路相互干扰、影响的情况，满足了OLED对电源输出稳定性的要求，提高了OLED的画质效果；同时，由时序控制模块控制第一转换模块和第二转换模块的启动时序，使开关机信号和使能信号同时稳定后才点亮OLED屏，改变了传统电源的开关机时序，使得电源能够适应OLED快响应特性，解决了现有开关机时序同时打开或关断导致花屏 的问题。
附图说明
图1为现有的电源架构中同一变压器不同绕组分别输出电压的示意图；
图2为现有的电源架构中同一变压器同一绕组输出电压的示意图；
图3为现有的电源架构中电源开关机时序示意图；
图4为本发明实施例提供的OLED驱动电源装置应用实施例的示意图；
图5为本发明实施例提供的电源板较佳实施例的结构框图；
图6为本发明实施例提供的电源板和主板之间连接的插座引脚示意图；
图7为本发明实施例提供的电源板和OLED屏之间连接的插座引脚示意图；
图8为本发明实施例提供的开关时序控制电路的电路图；
图9为本发明实施例提供的使能控制电路的电路图；
图10为本发明实施例提供的OLED驱动电源装置的开关机时序示意图。
具体实施方式
本发明提供一种OLED驱动电源装置，为使本发明的目的、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发明进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。
本发明提供的OLED驱动电源装置适用于采用OLED(有机发光二极管)作为显示方案的电视、监视器，电教，背投，等离子显示等显示领域的电源驱动。请参阅图4，本发明提供的OLED驱动电源装置包括与主板20和OLED屏30连接的电源板10。所述电源板10包括待机电路110、时序控制模块120、第一转换模块130、第二转换模块140和PFC电路150。所述待机电路110连接时序控制模块120和主板20，其在接通电源后输出电源电压(本实施例中为5V)给主板20的CPU和时序控制模块120供电，使CPU正常工作。所述时序控制模块120连接PFC电路150、主板20、第一转换模块130和第二转换模块140，时序控制模块120一方面根据所述CPU反馈的开关机信号ON/OFF启动PFC电路150。PFC电路150工作后输出高压直流HV_DC给时序控制模块、第一转换模块和第二转换模块。时序控制模块120根据高压直流HV_DC和使能信号ENA启动第一转换模块130和第二转换模块130，并控制第一转换模块130和第二转换模块140的启动时序，使开关机信号ON/OFF和使能信号ENA同时稳定后点亮OLED屏。所述第一转换模块130和第二转换模块140均连接主板20和PFC电路150。第一转换模块130启动后将所述高压直流HV_DC转换成第一电压(本实施例中为+12V电压)给 主板20供电。第二转换模块140启动后将高压直流HV_DC转换成第二电压(本实施例中为+20V)给主板20和OLED屏30供电。
其中，所述时序控制模块120包括开关时序控制电路121和使能控制电路122；所述开关时序控制电路121连接PFC电路150、使能控制电路122、第一转换模块130和主板20，所述使能控制电路122连接第二转换模块140。开关时序控制电路121根据主板反馈的开关机信号ON/OFF输出第一电源PFC_VCC启动PFC电路150，根据PFC电路150输出的高压直流HV_DC输出第二电源VCC1给使能控制电路122和第一转换模块130供电。使能控制电路122根据主板反馈的使能信号ENA输出第三电源20V_VCC给第二转换模块140供电。
具体实施时，所述待机电路还在接通电源后输出工作电压(约25V)给开关时序控制电路，以提供第一电源PFC_VCC和第二电源VCC1的转换电源。请继续参阅图4，所述开关时序控制电路具体包括：第一电源控制子电路1211和第二电源控制子电路1212。所述第一电源控制子电路1211连接待机电路110、主板、PFC电路150和第二电源控制子电路1212，所述第二电源控制子电路1212连接PFC电路150、使能控制电路122和第一转换模块1211。
第一电源控制子电路1211根据主板反馈的开关机信号将待机电路110输出的工作电压VCC转换为第一电源PFC_VCC来启动PFC电路150。第二电源控制子电路1212根据PFC电路150启动后输出 的高压直流HV_DC将所述工作电压VCC转换为第二电源VCC1给使能控制电路和第一转换模块供电。
为了解决现有电源架构中共用变压器影响电源稳定性的问题，本实施例采用独立的变压器、独立的PWM控制器分别将高压直流转换成独立的+12V电压和+20V电压输出。请一并参阅图5，所述第一转换模块130包括第一PWM控制器131和第一变压器132，所述第二转换模块140包括第二PWM控制器141和第二变压器142。
所述第一PWM控制器131连接时序控制模块，根据开关时序控制电路输出的第二电源VCC1启动第一变压器132；第一变压器132连接第一PWM控制器131和主板，其将PFC电路输出的高压直流HV_DC转换成第一电压(即+12V)、输出给主板供电。
所述第二PWM控制器141连接时序控制模块，其根据使能控制电路输出的第三电源20V_VCC启动第二变压器142；所述第二变压器142连接第二PWM控制器和主板，其将PFC电路输出的高压直流HV_DC转换成第二电压(即+20V)、输出给主板供电。
本实施例采用独立的变压器分别输出第一电压(即+12V)和第二电压(即+20V)进行供电，+12V与+20V之间从根源上相互独立，该两路输出以及PWM控制是否正常工作都不会相互影响，从而避免了两路电压之间的干扰问题。并且，由于两路电压的输出完全分离，当单路负载变化时也不会对另一路的电压输出产生影响，从而进一步保证了系统正常工作的稳定性。尤其是对于OLED屏，基于OLED是通过电流驱动有机薄膜本身来发光，电流的变化会导致其画面色彩 的变化。本实施例将电源板上输出第一电压和第二电压的相互独立，使得整机在工作时稳定正常，有效地提高了产品的电性能，提高OLED电视的画质体验，延缓OLED屏的使用寿命。
需要理解的是，所述待机电路110、PFC电路150、第一PWM控制器131、第二PWM控制器141均为现有技术，此处对其具体电路结构不作详述。
以电视机为例，实际应用中电视机的显示部分由电源板、主板、TO-CON板、副板组成(在LED电视中还有恒流板)。这些板正常工作所需的电压电流都是由电源板提供，不同的板子功能不同，对电源的要求也不一样。电源板、主板、屏体正常工作时的功耗根据尺寸的不同而不同，以55寸OLED电视为例，电源板向主板提供的电压有+5V、+12V和+20V，电源板向OLED屏体提供的电压为+20V，最大电流约10A左右。
因此，本实施例在所述电源板10与主板20上各设置有一匹配的第一插座，通过USB数据线插入第一插座中进行连接，所述第一插座引脚如图6所示。结合图4与图6可以得出，电源板10与主板20之间交互的数据包括：使能信号ENA、开关机信号ON/OFF、5V的电源电压、+12V的第一电压、+20V的第二电压以及地GND。同理，电源板10与OLED屏30上也各设置有一匹配的第二插座，通过USB数据线插入第二插座中进行连接，所述第二插座引脚如图7所示。结合图4与图7可以得出，电源板10与OLED屏之间交互的数据包括：+20V的第二电压以及地GND。OLED屏由+20V的第二电压来点亮。 主板20与OLED屏之间也通过插座和USB数据线连接，主板20传输+12V的第一电压给OLED屏的相关控制电路供电，并通过数据Data来控制OLED屏的内容显示。具体实施时，插座引脚可适当增减，以实际电压需求为准。
进一步地，本实施例还通过主板上的CPU反馈的开关机信号ON/OFF和使能信号ENA来调整电源的开关机时序。只有当开关机信号ON/OFF与使能信号ENA同时打开时OLED屏才会被点亮，使本实施例提供的OLED驱动电源装置能满足OLED屏的时序要求。具体实施时，由开关时序控制电路和使能控制电路来调整开关机时序。
请一并参阅图8和图9，所述第一电源控制子电路1211包括：第一三极管Q1、第二三极管Q2、第三三极管Q3、第一光耦U1、第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4、第一二极管D1和第二二极管D2。所述第一电源控制子电路1212包括：第四三极管Q4、分流基准源T和分压电阻组1210。
所述第一三极管Q1的基极连接主板(用于输入开关机信号ON/OFF)，第一三极管Q1的发射极接地，第一三极管Q1的集电极连接第一光耦U1的第2脚(即发光二极管的负极)，所述第一光耦U1的第1脚(即发光二极管的正极)连接待机电路(用于输入5V的电源电压)，第一光耦U1的第4脚(即光敏三极管的集电极)连接待机电路和第二三极管Q2的集电极，第一光耦U1的第3脚(即光敏三极管的发射极)连接第一电阻R1的一端，所述第一电阻R1的另一端连接第二三极管Q2的基极、第一二极管D1的负极、还通 过第二电阻R2接地，所述第一二极管D1的正极接地，所述第二三极管Q2的发射极连接第三三极管Q3的集电极、第三电阻R3的一端和第四三极管Q4的发射极，所述第三电阻R3的另一端连接第三三极管Q3的基极、第二二极管D2的负极、还通过第四电阻R4接地，所述第二二极管D2的正极接地，第三三极管Q3的发射极连接PFC电路(用于输出第一电源PFC_VCC)，所述第四三极管Q4的基极连接分流基准源T的负极K，第四三极管Q4的集电极连接使能控制电路、第一转换模块和分流基准源T的控制极VRE(用于输出第二电源VCC1)，所述分流基准源T的正极A接地，所述分压电阻组1210的第一端连接PFC电路(用于输入高压HV_DC)，分压电阻组1210的第二端连接分流基准源T的控制极VRE，分压电阻组1210的第三端接地。
本实施例中，所述第一三极管Q1、第二三极管Q2、第三三极管Q3均为NPN三极管，第四三极管Q4为PNP三极管。所述第一二极管D1和第二二极管D2为稳压二极管，能保护第二三极管Q2和第三三极管Q3。所述分流基准源T的型号为TL431，其导通电压为2.5V。所述第一光耦U1的型号为PC817。
所述分压电阻组1210由多个串联电阻组成，本实施例中包括依次串联的第一分压电阻Ra、第二分压电阻Rb、第三分压电阻Rc、第四分压电阻Rd和第五分压电阻Re。所述第一分压电阻Ra的一端(相当于分压电阻组1210的第一端)连接用于输入高压直流HV_DC的PFC电路，第五分压电阻Re的一端(相当于分压电阻组1210的第三 端)接地，第四分压电阻Rd和第五分压电阻Re的连接点(相当于分压电阻组1210的第2端)连接分流基准源T的控制极VRE。
具体实施时，所述第一电源控制子电路1211还包括由第三二极管D3、第五电阻R5、第六电阻R6和第一电容C1组成的滤波分压电路，以及用于限流的第七电阻R7。所述第三二极管D3的正极连接主板，第三二极管D3的负极连接第五电阻R5的一端，第五电阻R5的另一端连接第一三极管Q1的基极、还通过第六电阻R6接地，所述第一电容C1与第六电阻R6并联。第五电阻R5和第六电阻R6的分压即为第一三极管Q1基极上的导通电压、其决定了第一三极管Q1的导通状态，第一电容C1对所述导通电压进行平滑滤波处理，能提高导通状态的稳定性。所述第七电阻R7连接在待机电路与第一光耦U1的第1脚之间。
所述第一电阻R1、第二电阻R2、第三电阻R3和第四电阻R4的阻值决定了第二三极管Q2和第三三极管Q3的导通状态，从而控制第一电源PFC_VCC的压值。为了稳定第一电源PFC_VCC的输出，所述开关时序控制电路还包括两个极性电容、即第二电容C2和第三电容C3，所述第二电容C2的正极连接第二三极管Q2的发射极，第二电容C2的负极接地；所述第三电容的正极连接第三三极管Q3的发射极，第三电容C3的负极接地。
本实施例中，所述第二电源控制子电路1212还包括用于设置偏置电压，调整第四三极管Q4的导通状态的第八电阻R8和第九电阻R9。所述第八电阻R8的一端连接第四三极管Q4的发射极，第八电 阻R8的另一端连接分流基准源T的负极K与第九电阻R9的一端，第九电阻R9的另一端连接第四三极管Q4的基极。第八电阻R8和第九电阻R9的组值决定了第二电源VCC1的压值。
为了稳定第二电源VCC1的输出，所述第二电源控制子电路1212还包括用于隔直、滤波的第四二极管D4，用于进行回差控制分流基准源T持续导通的第十电阻R10、第五二极管D5和第四电容C4。所述第四二极管D4的负极连接使能控制电路和第一转换模块，第四二极管D4的正极连接第四三极管Q4的集电极、还通过第十电阻R10连接第五二极管D5的正极，第五二极管D5的负极连接分流基准源T的控制极VRE，第四电容C4连接在分流基准源T的控制极VRE与地之间。
为了确保分流基准源T导通的稳定性，所述第二电源控制子电路1212还包括用于滤波的第五电容C5，用于限流的第十一电阻R11和用于隔交流的第六二极管D6。所述第五电容C5连接分压电阻组的第2端(即与第五分压电阻Re并联)，第六二极管D6的负极连接分流基准源T的控制极VRE，第六二极管D6的正极通过第十一电阻R11连接分压电阻组1210的第2端。
如图9所示，所述使能控制电路包括第五三极管Q5、第六三极管Q6、第二光耦U2、第十二电阻R12、第十三电阻R13和第七二极管D7；所述第五三极管Q5的基极连接主板(用于输入使能信号ENA)，第五三极管Q5的发射极接地，第五三极管Q5的集电极连接第二光耦U2的第2脚(即发光二极管的负极)，所述第二光耦U2的第1脚 (即发光二极管的正极)连接待机电路(用于输入5V的电源电压)，第二光耦U2的第4脚(即光敏三极管的集电极)连接第四三极管Q4的集电极和第六三极管Q6的集电极，第二光耦U2的第3脚(即光敏三极管的发射极)连接第十二电阻R12的一端，所述第十二电阻R12的另一端连接第六三极管Q6的基极、第七二极管D7的负极、还通过第十三电阻R13接地，所述第七二极管D7的正极接地，所述第六三极管Q6的发射极连接第二转换模块(用于输出第三电源20V_VCC)。
本实施例中，所述第五三极管Q5、第六三极管Q6均为NPN三极管。所述第七二极管D7为稳压二极管，能保护第六三极管Q6。调整第十二电阻R12和第十三电阻R13的阻值能影响第六三极管Q6的导通状态，从而控制第三电源20V_VCC的压值。
为了滤除外部输入的使能信号ENA的干扰、平滑其波形，所述使能控制电路还包括第八二极管D8、第十四电阻R14、第十五电阻R15和第六电容C6。所述第八二极管D8的正极连接主板(用于输入使能信号ENA)，第八二极管D8的负极连接第十四电阻R14的一端，第十四电阻R14的另一端连接第五三极管Q5的基极、还通过第十五电阻R15接地，所述第六电容C6与第十五电阻R15并联。第十四电阻R14和第十五电阻R15的分压即为第五三极管Q5的导通电压、其决定了第五三极管Q5的导通状态，第六电容C6对所述导通电压进行平滑滤波处理，能提高导通状态的稳定性。
请继续参阅图4-图9。当所述OLED驱动电源装置外接交流电后，所述待机电路110输出+5V的电源电压给主板的CPU和第一光耦U1的第1脚供电。同时，待机电路110还输出工作电压VCC(约25V)给第一光耦U1的第4脚和第二三极管Q2的集电极供电。CPU正常工作后，给电源板的开关时序控制电路提供一个开关机信号ON/OFF(高电平有效，相当于开机信号)，使第一三极管Q1饱和导通。此时第一光耦U1的导通量增加，其光敏三极管导通使第二三极管Q2的基极电压升高，第二三极管Q2导通使第三三极管Q3的基极电压升高，第三三极管Q3也饱和导通。工作电压VCC依次经过第二三极管Q2、第三三极管Q3降压后输出第一电源PFC_VCC给PFC电路供电。
电源板的PFC电路开始工作，生成高压直流HV_DC(高于380V)反馈给分压电阻组1210的第一端。高压直流HV_DC经过分压电阻组1210分压为高于2.5V的电压给分流基准源T的控制极VRE，分流基准源T导通使第四三极管Q4的基极为低电平，第四三极管Q4导通。则工作电压VCC依次经过第二三极管Q2、第四三极管Q4降压后输出第二电源VCC1给第一转换模块，第一转换模块将第二电源VCC1转换成+12V的第一电压给主板，使主板正常工作后反馈使能信号ENA(高电平有效，相当于点屏)给电源板。
电源板的使能控制电路接收到使能信号ENA之后，第五三极管Q5导通，使第二光耦U2导通量增加，第六三极管Q6的基极电压升高，第六三极管Q6饱和导通。则第二电源VCC1经过第六三极管 Q6降压后输出第三电源20V_VCC给第二转换模块，第二转换模块将第三电源20V_VCC转换成+20V的第二电压给主板和OLED屏供电。此时OLED屏才会被点亮。具体实施时主板还将一路+20V的第二电压输送至功放电路(此为现有技术，此处不作详述)。
当开关机信号ON/OFF为低电平时(相当于关机信号)，第一三极管Q1截止使第一光耦U1关闭，第二三极管Q2、第三三极管Q3依次截止，此时无第一电源PFC_VCC输出，PFC电路停止工作，则无高压直流HV_DC产生，第四三极管Q4也截止，无第二电源VCC1输出，第一转换模块停止工作导致无第一电压输出。
当使能信号ENA为低电平时(相当于关屏)，第五三极管Q5截止使第二光耦U2关闭，第六三极管Q6也截止。第三电源20V_VCC变成低电平，从而使第二转换模块停止工作，无+20V的第二电压给OLED屏供电，OLED屏关闭。
对所述OLED驱动电源装置进行电路仿真后得到的开关机时序示意图如图10所示。根据上述电路的工作原理可知：电源板10接收到主板20反馈的开关机信号ON/OFF后，控制第一转换模块130输出+12V的第一电压给主板20。大约T1时间后第一电压稳定，主板20开始工作，在T2时间后主板20向OLED屏30发送数据Data，由于此时还没有+20V的第二电压，OLED屏还没有点亮。再间隔大约T3时间后主板20反馈使能信号ENA给电源板10，使能控制电路接到使能信号ENA后，控制第二转换模块140输出+20V的第二电压给主板和OLED屏。历过T4的时间后第二电压达到稳定输出，OLED 屏被点亮，开始识别数据Data显示画面。从+12V电压开启到+20V电压开启至少间隔了36ms的时间(T1+T2+T3+T4)。
关机时，主板向电源板发出低电平的使能信号ENA(相当于关闭信号)，电源板停止输出+20V的第二电压，OLED屏关闭。再间隔时间T6时间后主板20发出低电平的开关机信号ON/OFF(低电平相当于关机信号)，电源板再停止输出+12V的第一电压，整机进入待机状态。本实施例中T6时间不少于30ms。这样启闭OLED屏与主板不会同时进行，避免出现花屏的问题。
综上所述，本发明提供的OLED驱动电源装置，接通交流电源后，先由电源板的待机电路输出5V的电源电压给主板的CPU供电，CPU正常工作后反馈开关机信号ON/OFF启动电源板的开关时序控制电路，输出第一电源PFC_VCC启动PFC电路，PFC电路输出的高压直流使开关时序控制电路输出第二电源VCC1给第一转换模块进行+12V电压转换，同时给使能控制电路供电；电源板输出+12V电压给主板后，主板再反馈使能信号ENA给使能控制电路，使其输出第三电源20V_VCC给第二转换模块进行+20V电压转换，电源板输出+20V电压点亮OLED屏。
由于所述第一二转换模块和第二转换模块采用独立的变压器分别输出+12V电压和+20V电压，该两路电压输出以及控制均相互独立，不会相互影响，从而避免了现有技术共用变压器导致两路电压之间的干扰问题。并且，由于两路电压的输出完全分离，当单路负载变化时也不会对另一路的电压输出产生影响，使得整机在工作时稳定正常， 有效地提高了产品的电性能，提高OLED电视的画质体验，延缓OLED屏的使用寿命。
同时，本发明在关机信号和使能信号同时稳定后才输出+20V电压来点亮OLED屏，改变了传统电源的开关机时序，使得电源能够适应OLED快响应特性，解决了现有开关机时序同时开断导致花屏的问题。
可以理解的是，对本领域普通技术人员来说，可以根据本发明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发明所附的权利要求的保护范围。

Claims (14)

  1. 一种OLED驱动电源装置，包括与主板和OLED屏连接的电源板，其特征在于，所述电源板包括：待机电路、时序控制模块、第一转换模块、第二转换模块和PFC电路；
    所述待机电路用于接通电源后输出电源电压给主板和时序控制模块供电；时序控制模块根据主板反馈的开关机信号启动PFC电路；PFC电路输出高压直流给时序控制模块、第一转换模块和第二转换模块；时序控制模块根据PFC电路输出的高压直流、使能信号启动第一转换模块和第二转换模块，第一转换模块将高压直流转换成第一电压给主板供电，第二转换模块将高压直流转换成第二电压给主板和OLED屏供电；时序控制模块还控制第一转换模块和第二转换模块的启动时序，使开关机信号和使能信号同时稳定后点亮OLED屏。
  2. 根据权利要求1所述的OLED驱动电源装置，其特征在于，所述第一转换模块包括：
    第一PWM控制器，用于根据开关时序控制电路输出的第二电源启动第一变压器；
    第一变压器，用于将PFC电路输出的高压直流转换成第一电压、输出给主板供电；
    所述第一变压器连接第一PWM控制器和主板，所述第一PWM控制器连接时序控制模块。
  3. 根据权利要求1所述的OLED驱动电源装置，其特征在于，所述第二转换模块包括：
    第二PWM控制器，用于根据使能控制电路输出的第三电源启动第二变压器；
    第二变压器，用于将PFC电路输出的高压直流转换成第二电压、输出给主板供电；
    第二变压器连接第二PWM控制器和主板，所述第二PWM控制器连接时序控制模块。
  4. 一种OLED驱动电源装置，包括与主板和OLED屏连接的电源板，其特征在于，所述电源板包括：待机电路、时序控制模块、第一转换模块、第二转换模块和PFC电路；
    所述待机电路用于接通电源后输出电源电压给主板和时序控制模块供电；时序控制模块根据主板反馈的开关机信号启动PFC电路；PFC电路输出高压直流给时序控制模块、第一转换模块和第二转换模块；时序控制模块根据PFC电路输出的高压直流、使能信号启动第一转换模块和第二转换模块，第一转换模块将高压直流转换成第一电压给主板供电，第二转换模块将高压直流转换成第二电压给主板和OLED屏供电；时序控制模块还控制第一转换模块和第二转换模块的启动时序，使开关机信号和使能信号同时稳定后点亮OLED屏，
    所述时序控制模块包括：
    开关时序控制电路，用于根据主板反馈的开关机信号输出第一电源启动PFC电路，根据PFC电路输出的高压直流输出第二电源给使能控制电路和第一转换模块供电；
    使能控制电路，用于根据主板反馈的使能信号输出第三电源给第 二转换模块供电；
    所述开关时序控制电路连接PFC电路、使能控制电路、第一转换模块和主板，所述使能控制电路连接第二转换模块。
  5. 根据权利要求4所述的OLED驱动电源装置，其特征在于，所述第一转换模块包括：
    第一PWM控制器，用于根据开关时序控制电路输出的第二电源启动第一变压器；
    第一变压器，用于将PFC电路输出的高压直流转换成第一电压、输出给主板供电；
    所述第一变压器连接第一PWM控制器和主板，所述第一PWM控制器连接时序控制模块。
  6. 根据权利要求4所述的OLED驱动电源装置，其特征在于，所述第二转换模块包括：
    第二PWM控制器，用于根据使能控制电路输出的第三电源启动第二变压器；
    第二变压器，用于将PFC电路输出的高压直流转换成第二电压、输出给主板供电；
    第二变压器连接第二PWM控制器和主板，所述第二PWM控制器连接时序控制模块。
  7. 根据权利要求4所述的OLED驱动电源装置，其特征在于，所述待机电路还用于接通电源后输出工作电压给开关时序控制电路；所述开关时序控制电路包括：
    第一电源控制子电路，用于根据主板反馈的开关机信号将待机电路输出的工作电压转换为第一电源来启动PFC电路；
    第二电源控制子电路，用于根据PFC电路启动后输出的高压直流将所述工作电压转换为第二电源给使能控制电路和第一转换模块供电；
    所述第一电源控制子电路连接待机电路、主板、PFC电路和第二电源控制子电路，所述第二电源控制子电路连接PFC电路、使能控制电路和第一转换模块。
  8. 根据权利要求4所述的OLED驱动电源装置，其特征在于，所述第一电源控制子电路包括：第一三极管、第二三极管、第三三极管、第一光耦、第一电阻、第二电阻、第三电阻、第四电阻、第一二极管和第二二极管；所述第一三极管的基极连接主板，第一三极管的发射极接地，第一三极管的集电极连接第一光耦的第2脚，所述第一光耦的第1脚连接待机电路，第一光耦的第4脚连接待机电路和第二三极管的集电极，第一光耦的第3脚连接第一电阻的一端，所述第一电阻的另一端连接第二三极管的基极、第一二极管的负极、还通过第二电阻接地，所述第一二极管的正极接地，所述第二三极管的发射极连接第三三极管的集电极、第三电阻的一端和第二电源控制子电路，所述第三电阻的另一端连接第三三极管的基极、第二二极管的负极、还通过第四电阻接地，所述第二二极管的正极接地，第三三极管的发射极连接PFC电路。
  9. 根据权利要求4所述的OLED驱动电源装置，其特征在于， 所述第二电源控制子电路包括：第四三极管、分流基准源和分压电阻组；所述第四三极管的基极连接分流基准源的负极，第四三极管的集电极连接使能控制电路、第一转换模块和分流基准源的控制极，第四三极管的发射极连接第一电源控制子电路，所述分流基准源的正极接地，所述分压电阻组的第一端连接PFC电路，分压电阻组的第二端连接分流基准源的控制极，分压电阻组的第三端接地。
  10. 根据权利要求8所述的OLED驱动电源装置，其特征在于，所述第一电源控制子电路还包括第三二极管、第五电阻、第六电阻、第一电容和第七电阻；所述第三二极管的正极连接主板，第三二极管的负极连接第五电阻的一端，第五电阻的另一端连接第一三极管的基极、还通过第六电阻接地，所述第一电容与第六电阻并联，所述第七电阻连接在待机电路与第一光耦的第1脚之间。
  11. 根据权利要求9所述的OLED驱动电源装置，其特征在于，所述第二电源控制子电路还包括第八电阻和第九电阻；所述第八电阻的一端连接第四三极管的发射极，第八电阻的另一端连接分流基准源的负极与第九电阻的一端，第九电阻的另一端连接第四三极管的基极。
  12. 根据权利要求9所述的OLED驱动电源装置，其特征在于，所述第二电源控制子电路还包括第四二极管、第十电阻、第五二极管和第四电容；所述第四二极管的负极连接使能控制电路和第一转换模块，第四二极管的正极连接第四三极管的集电极、还通过第十电阻连接第五二极管的正极，第五二极管的负极连接分流基准源的控制极，第四电容连接在分流基准源的控制极与地之间。
  13. 根据权利要求9所述的OLED驱动电源装置，其特征在于，所述第二电源控制子电路还包括第五电容、第十一电阻和第六二极管；所述第五电容连接分压电阻组的第2端，第六二极管的负极连接分流基准源的控制极，第六二极管的正极通过第十一电阻连接分压电阻组的第2端。
  14. 根据权利要求9所述的OLED驱动电源装置，其特征在于，所述使能控制电路包括第五三极管、第六三极管、第二光耦、第十二电阻、第十三电阻和第七二极管；所述第五三极管的基极连接主板，第五三极管的发射极接地，第五三极管的集电极连接第二光耦的第2脚，所述第二光耦的第1脚连接待机电路，第二光耦的第4脚连接第二电源控制子电路和第六三极管的集电极，第二光耦的第3脚连接第十二电阻的一端，所述第十二电阻的另一端连接第六三极管的基极、第七二极管的负极、还通过第十三电阻接地，所述第七二极管的正极接地，所述第六三极管的发射极连接第二转换模块。
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