WO2018209823A1 - 一种基于llc的背光驱动控制电路 - Google Patents

一种基于llc的背光驱动控制电路 Download PDF

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Publication number
WO2018209823A1
WO2018209823A1 PCT/CN2017/096422 CN2017096422W WO2018209823A1 WO 2018209823 A1 WO2018209823 A1 WO 2018209823A1 CN 2017096422 W CN2017096422 W CN 2017096422W WO 2018209823 A1 WO2018209823 A1 WO 2018209823A1
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WIPO (PCT)
Prior art keywords
resistor
electrically connected
diode
llc
capacitor
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PCT/CN2017/096422
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English (en)
French (fr)
Inventor
余学坤
李文东
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深圳市华星光电技术有限公司
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Priority to US15/578,146 priority Critical patent/US10271392B2/en
Publication of WO2018209823A1 publication Critical patent/WO2018209823A1/zh

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Classifications

    • 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
    • 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
    • G09G3/36—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 using liquid crystals

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to an LED-based backlight driving control circuit.
  • LED backlight modules composed of 2-way or 4-way LED strips to reduce the backlight cost of LED TV sets.
  • the traditional application uses a two-way BOOST topology to realize constant current dimming control of the lamp string.
  • the traditional application uses a four-way BOOST topology to realize constant current dimming control of the lamp string.
  • boost inductor X2 boost MOSX2, Schottky diode X2, and output high voltage electrolysis X2.
  • boost inductor X4 boost MOSX4, Schottky diode X4, and output high voltage electrolysis X4.
  • the object of the present invention is to provide an LED-based backlight driving control circuit, which can reduce the power device, improve the working efficiency, and reduce the utility model by eliminating the BOOST architecture and directly driving the two LED backlight strips by using LLC resonance. The effect of system cost.
  • the invention provides an LLC-based backlight driving control circuit, which comprises: an LLC resonant conversion circuit for driving current for periodic conversion; a rectifying and filtering circuit for balancing LED light bar differential pressure balance; a control circuit for Constant current feedback is implemented by constant current feedback; two LED strips are provided for providing LED backlight illumination; the LLC resonant conversion circuit, the rectifying and filtering circuit, the two LED strips and the control circuit are sequentially connected And forming a loop circuit; the LLC resonant converter circuit inputs a supply current to the two LED strips; and obtains a current flowing through the sampling resistor to control the output duty ratio of the LLC resonant converter circuit, thereby controlling the output to the two LEDs The voltage of the light bar.
  • the LLC resonant converter circuit includes a first diode, a first capacitor, a second diode, an isolated driving transformer, an LLC upper and lower half bridge MOS transistor, a second capacitor, and an LLC resonant transformer.
  • the anode of the first diode is grounded, and the cathode of the first diode is electrically connected to one end of the first capacitor and the output end of the control circuit; the other end of the first capacitor is electrically connected To isolate one end of the driving transformer; the anode of the second diode is grounded, and the cathode of the second diode is electrically connected to one end of the isolating driving transformer and the output end of the control circuit;
  • One end is electrically connected to one end of the LLC upper and lower half-bridge MOS tube; the other end of the LLC upper and lower half-bridge MOS tube is electrically connected to one end of the LLC resonant transformer and one end of the second capacitor respectively; the other end of the second capacitor Electrically connected to one end of the LLC resonant transformer; the other end of the LLC resonant transformer is electrically connected to the input of the rectifying and filtering circuit.
  • the LLC upper and lower half-bridge MOS transistors include: a first resistor, a second resistor, a third resistor, a fourth resistor, a third diode, a fourth diode, and a fifth resistor.
  • a sixth resistor an LLC upper half bridge MOS transistor, and an LLC lower half bridge MOS transistor; one end of the first resistor is electrically connected to the 6-pin of the isolated driving transformer, and the other end of the first resistor is electrically connected to the third resistor respectively One end and a negative pole of the third diode; one end of the second resistor is electrically connected to the 4 pin of the isolating driving transformer, and the other end of the second resistor is electrically connected to one end of the fourth resistor and the negative pole of the fourth diode respectively
  • the third resistor is connected in parallel to the third diode; the fourth resistor is connected in parallel to the fourth diode; one end of the fifth resistor is electrically connected to the other end of the third resistor, the third diode anode, and the upper half of the LLC
  • the gate of the bridge MOS transistor and the other end of the fifth resistor are respectively electrically connected to the 5-pin of the isolation driving transformer, the source of the upper half-bridge MOS transistor of the LLC, and the
  • the rectifying and filtering circuit includes: a third capacitor, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a fourth capacitor, and a fifth a capacitor is electrically connected to an output end of the LLC resonant converter circuit, and the other end of the third capacitor is electrically connected to the fifth diode negative electrode and the sixth diode positive electrode, respectively;
  • One end of the fourth capacitor is electrically connected to the sixth diode negative pole, and is electrically connected to the two LED strips through the first connector, and the other end of the fourth capacitor is grounded; Connected to the seventh diode negative pole, and electrically connected to the two LED strips through the second connector, the other end of the fifth capacitor is electrically connected to the eighth diode anode and through the second connector Electrically connected to two LED strips.
  • the third capacitor is a light bar differential pressure balancing capacitor; the fifth diode, the sixth diode, the seventh diode, and the eighth diode are output bridges. a rectifier diode; the fourth capacitor and the fifth capacitor are output filter capacitors.
  • the control circuit includes a seventh resistor and a controller; the seventh resistor is a current sampling resistor, and one end of the seventh resistor is electrically connected to one end of the controller, and passes through The first connector is electrically connected to the two LED strips, and the other end of the seventh resistor is grounded; the other end of the controller is electrically connected to the input end of the LLC resonant converter circuit.
  • the controller obtains the LED current value through the potential on the seventh resistor and adjusts the output signal of the controller to further adjust the output of the LLC resonant converter circuit.
  • the LLC-based backlight driving control circuit of the present invention optimizes the backlight driving topology and directly drives the two LED backlight strips by using LLC resonance to simplify the backlight driving architecture, improve system working efficiency, and reduce system cost.
  • FIG. 1 is a schematic diagram of module connection of an LLC-based backlight driving control circuit according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram showing a specific implementation of an LLC-based backlight driving control circuit according to an embodiment of the present invention.
  • the present invention provides a backlight driving control circuit based on LLC (Resonance Conversion Circuit), comprising: an LLC resonant conversion circuit 110 for driving current for periodic conversion; and a rectifying and filtering circuit 120 For balancing the balance of the LED strip pressure difference; a control circuit 140 for achieving constant current feedback by constant current feedback; two LED strips 130 for providing LED backlight illumination; the LLC resonant converter circuit 110, The rectifying and filtering circuit 120, the two LED strips 130 and the control circuit 140 are sequentially connected, and form a loop circuit; the LLC resonant converter circuit 110 inputs a supply current to the two LED strips 130; The current of the sampling resistor is used to control the output duty ratio of the LLC resonant converter circuit 110, thereby controlling the voltage output to the two LED strips 130.
  • LLC Resonance Conversion Circuit
  • the first capacitor C1 in the LLC resonant converter circuit 110 drives the current period in the upper and lower half-bridge MOS transistors of the LLC by isolating the driving transformer TS1 according to the current fed back by the control circuit 140. Alternate change. When the current is positive half cycle, the upper half bridge MOS transistor M1 is turned on; when the current is negative half cycle, the lower half bridge MOS transistor M2 is turned on.
  • the structural connection relationship of the LLC resonance conversion circuit 110 will be specifically described below.
  • the LLC resonant converter circuit 110 includes a first diode D1, a first capacitor C1, a second diode D2, an isolated drive transformer TS1, an upper and lower half-bridge MOS transistor, a second capacitor C2, and an LLC resonant transformer TS2.
  • the anode of the first diode D1 is grounded, and the cathode of the first diode D1 is electrically connected to one end of the first capacitor C1 and the output end of the control circuit 140; the other end of the first capacitor C1 Electrically connected to one end of the isolated driving transformer TS1 (such as the 1 pin of the isolated driving transformer TS1 in FIG.
  • the anode of the second diode D2 is grounded, and the cathode of the second diode D2 is electrically connected
  • the driving transformer TS1 such as the 2-pin of the isolated driving transformer TS1 in FIG. 2
  • the other end of the isolated driving transformer TS1 (such as the 5-pin of the isolated driving transformer TS1 in FIG. 2) Connected to one end of the LLC upper and lower half-bridge MOS tube; the other end of the LLC upper and lower half-bridge MOS tube is electrically connected to one end of the LLC resonant transformer TS2 (such as the 7-pin of the isolated drive transformer TS1 in FIG.
  • the isolating drive transformer TS1 is a 1:1:1 transformer
  • the first diode D1 and the second diode D2 are BAT54 type diodes
  • the first capacitor C1 is a 1 ⁇ F capacitor.
  • the first diode D1 and the second diode D2 are preferred components. Since the two driving of the control circuit 140 is electrically connected to the LLC upper half bridge MOS tube M1 and the LLC lower half bridge MOS tube M2 by isolating the driving transformer TS1 and the first capacitor C1, and possibly due to the risk factor of LC resonance Causes the drive voltage to be too high. Therefore, in the present embodiment, the first diode D1 and the second diode D2 are provided, thereby limiting the gate driving voltages of the upper half-bridge MOS transistor M1 and the lower half-bridge MOS transistor M2 of the LLC, thereby ensuring the entire The safety and stability of the circuit.
  • the LLC upper and lower half-bridge MOS transistors include: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third diode D3, and a fourth diode D4.
  • one end of the sixth resistor R6 is electrically connected to The other end of the fourth resistor R4, the cathode of the fourth diode D4 and the gate of the lower half bridge MOS transistor M2, and the other end of the sixth resistor R6 are electrically connected to the 3-pin of the isolation drive transformer TS1 and the lower half of the LLC.
  • the source of the MOS transistor M2 is grounded; the source of the upper half-bridge MOS transistor M1 of the LLC is electrically connected to the drain of the lower half-bridge MOS transistor M2 of the LLC; the drain electrical property of the upper half-bridge MOS transistor M1 of the LLC Connect to the PFC output port (ie PFC OUT).
  • the third diode D3 and the fourth diode D4 are 1N4148 type diodes; the LLC upper half bridge MOS tube M1 and the LLC lower half bridge MOS tube M2 are 12N60 type MOS tubes; the first resistor R1 and the second resistor R2 are resistors of 10 ohms, the third resistor R3 and the fourth resistor R4 are resistors of 47 ohms, the fifth resistor R5 and the sixth resistor R6 are resistors of 10 ohms; the second capacitor C2 is 33 nF/1000V Capacitance.
  • the third resistor R3, the fourth resistor R4, the third diode D3, and the fourth diode D4 form a discharge circuit.
  • the gate and source of the LLC upper and lower half-bridge MOS transistors have parasitic capacitances (Cgs), so the gate voltages of the LLC upper and lower half-bridge MOS transistors are not Will be quickly reduced to zero, there is still a period of conduction.
  • the discharge circuit since the discharge circuit is disposed, the parasitic capacitances of the gate and the source of the upper and lower half-bridge MOS transistors of the LLC are discharged through the third diode D3 and the fourth diode D4, thereby reducing Misleading risks.
  • the rectifying and filtering circuit 120 includes: a third capacitor C3, a fifth diode D5, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a fourth capacitor.
  • C4 and a fifth capacitor C5 one end of the third capacitor C3 is electrically connected to the output end of the LLC resonant converter circuit 110, and the other end of the third capacitor C3 is electrically connected to the anode of the fifth diode D5 and a sixth diode D6 positive electrode;
  • one end of the fourth capacitor C4 is electrically connected to the negative pole of the sixth diode D6, and is electrically connected to the first LED strip through the first connector CON1 (not shown)
  • the other end of the fourth capacitor C4 is grounded; one end of the fifth capacitor C5 is electrically connected to the cathode of the seventh diode D7, and is electrically connected to the second LED strip through the second connector CON2 ( The other end of the fifth capacitor C5 is electrically connected to the anode of
  • the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 are capacitors of 1 ⁇ F/250 V; the fifth diode D5, the sixth diode D6, and the seventh diode D7 and The eighth diode D8 is a 600V/4A type diode.
  • the third capacitor C3 may be a light bar differential pressure balancing capacitor; the fifth diode D5, the sixth diode D6, the seventh diode D7, and the eighth diode D8.
  • the fourth capacitor C4 and the fifth capacitor C5 are output filter capacitors.
  • the third capacitor C3 since the third capacitor C3 is provided, the voltage difference between the two LED strips 130 is balanced by the capacitor. When the voltages of the two LED strips 130 are exactly the same, the third electric charge is charged and discharged, and the voltage on the third capacitor C3 is zero; when the two LED strips 130 have a voltage difference, if the second LED strip is When the voltage of the third capacitor C3 is greater than the first LED strip, the voltage of the third capacitor C3 is left negative right positive, and when the first LED strip is turned on, the energy is stored in the third capacitor C3 of the light bulb differential balance.
  • the light bar pressure difference balances the third capacitor C3 and simultaneously releases energy; when the voltage of the second LED strip is smaller than the first LED strip, the third capacitor C3 is left positive Right negative, when the first LED light bar is turned on, the light bar pressure difference balances the third capacitor C3 and simultaneously releases energy.
  • the energy storage is balanced with the light bar pressure difference third. Capacitor C3.
  • the control circuit 140 includes a seventh resistor R7 and a controller 141; the seventh resistor R7 is a current sampling resistor, and one end of the seventh resistor R7 is electrically connected to one end of the controller 141 and passes through the first connection.
  • the controller CON1 is electrically connected to the two LED strips 130, and the other end of the seventh resistor R7 is grounded.
  • the other end of the controller 141 is electrically connected to the input end of the LLC resonant converter circuit 110.
  • the current is input from one end of the transformer (such as pin 7 of the LLC resonant transformer TS2 in FIG. 2), and the secondary current is from the other end (such as the 10 pin of the LLC resonant transformer TS2 in FIG. 2).
  • Output turn on the seventh diode D7, charge the fifth capacitor C5, and simultaneously turn on the first LED strip through the first connector, and at this time the third capacitor C3 discharges and flows back to the LLC resonant transformer TS2
  • One end (such as the 9-pin of the LLC resonant transformer TS2 in Figure 2).
  • the secondary current flows out from the other end of the LLC resonant transformer TS2 (such as pin 9 of the LLC resonant transformer TS2 in FIG. 2), charging the third capacitor C3, and flowing through the sixth two.
  • the pole tube D6 charges the fourth capacitor C4, and turns on the second LED strip through the second connector, and the current flowing through the second LED strip passes through the seventh resistor R7 to the ground, and passes through the eighth diode D8.
  • a periodic loop is formed which implements the first LED strip and the second LED strip.
  • the positive half cycle of the LLC resonant transformer TS2 is the same as the current of the negative half cycle, so that only one of the LED strips can be sampled to ensure that the other LED strip has the same current. Constant current.
  • the circuit of the present invention does not use BOOST for boosting, there is no problem of serious loss, that is, high cost.
  • the controller 141 obtains the LED current value through the potential on the seventh resistor R7 and adjusts the output signal of the controller 141 to further adjust the output of the LLC resonance conversion circuit 110. That is, when the voltage value on the seventh resistor R7 is detected, the controller 141 changes the output of the LLC resonance varying circuit accordingly to change the gain of the entire loop, achieving constant current of the LED.
  • the controller 141 outputs a signal to lower the output duty ratio of the isolated driving transformer TS1;
  • the controller 141 outputs another signal to increase the output control ratio of the isolated drive transformer TS1 when the voltage is less than or equal to. That is, the output duty ratio of the isolated drive transformer TS1 is controlled by the controller 141.
  • the LLC resonant transformer TS2 is configured by a primary turns (NP), a secondary turns (NS), and a leakage inductance (LR, which is parasitic in the LLC resonant transformer TS2 and regulated by the coupling of the primary and secondary windings).
  • NP primary turns
  • NS secondary turns
  • LR leakage inductance

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Abstract

一种基于LLC的背光驱动控制电路，包括：一LLC谐振变换电路(110)，用于驱动电流进行周期变换；一整流滤波电路(120)，用于平衡LED灯条压差平衡；一控制电路(140)，用于通过恒流反馈实现恒流反馈；两路LED灯条(130)，用于提供LED背光光亮；LLC谐振变换电路(110)、整流滤波电路(120)、两路LED灯条(130)和控制电路(140)依次连接，形成一循环回路； LLC谐振变换电路(110)向两路LED灯条(130)输入供电电流；通过获取流经采样电阻（R7）的电流以控制LLC谐振变换电路(110)的输出占空比，进而控制输出至两路LED灯条(130)的电压。

Description

一种基于LLC的背光驱动控制电路 技术领域
本发明涉及液晶显示领域，尤其涉及一种基于LLC的背光驱动控制电路。
 背景技术
随着LED发光效率的不断提高，越来越多的大尺寸LED电视机已采用2路或4路的LED灯条所构成的LED背光模组，以降低LED电视机的背光成本。
对于大尺寸2路灯条的背光方案，传统的应用是采用两路BOOST拓扑，实现灯串恒流调光控制。对于大尺寸4路灯条的背光方案，传统的应用是采用四路BOOST拓扑，实现灯串恒流调光控制。
然而，对于两路BOOST的系统而言，背光部分至少需要的功率器件为：升压电感X2，升压MOSX2，肖特基二极管X2，输出高压电解X2。同样，对于四路BOOST的系统而言，背光部分至少需要的功率器件为：升压电感X4，升压MOSX4，肖特基二极管X4，输出高压电解X4。由此，功率器件的增加，意味着系统成本的上升。另外，功率器件的增加会导致损耗增加，进一步影响系统的工作效率。且，电源板PCB面积需要增大，以支持更多数量的元器件。
有鉴于此，现有技术有待改进和提高。
 技术问题
本发明的目的在于，提供一种基于LLC的背光驱动控制电路，其通过省去BOOST架构，并采用LLC谐振直接驱动2路LED背光灯条方式，从而达到减少功率器件，提高工作效率，并降低系统成本的效果。
 技术解决方案
本发明提供一种基于LLC的背光驱动控制电路，其包括：一LLC谐振变换电路，用于驱动电流进行周期变换；一整流滤波电路，用于平衡LED灯条压差平衡；一控制电路，用于通过恒流反馈实现恒流反馈；两路LED灯条，用于提供LED背光光亮；所述LLC谐振变换电路、所述整流滤波电路、所述两路LED灯条和所述控制电路依次连接，并形成一循环回路；所述LLC谐振变换电路向两路LED灯条输入供电电流；通过获取流经采样电阻的电流以控制LLC谐振变换电路的输出占空比，进而控制输出至两路LED灯条的电压。
在本发明的一实施例中，所述LLC谐振变换电路包括第一二极管、第一电容、第二二极管、隔离驱动变压器、LLC上下半桥MOS管、第二电容及LLC谐振变压器；所述第一二极管的正极接地，所述第一二极管的负极分别电性连接至所述第一电容的一端及控制电路输出端；所述第一电容的另一端电性连接至隔离驱动变压器的一端；所述第二二极管的正极接地，所述第二二极管的负极分别电性连接至隔离驱动变压器的一端及控制电路输出端；所述隔离驱动变压器的另一端电性连接至LLC上下半桥MOS管的一端；所述LLC上下半桥MOS管的另一端分别电性连接至LLC谐振变压器的一端及第二电容的一端；所述第二电容的另一端电性连接至LLC谐振变压器的一端；所述LLC谐振变压器的另一端电性连接至整流滤波电路输入端。
在本发明的一实施例中，所述LLC上下半桥MOS管包括：第一电阻、第二电阻、第三电阻、第四电阻、第三二极管、第四二极管、第五电阻、第六电阻、LLC上半桥MOS管及LLC下半桥MOS管；第一电阻的一端电性连接至隔离驱动变压器的6脚，第一电阻的另一端分别电性连接至第三电阻的一端及第三二极管的负极；第二电阻的一端电性连接至隔离驱动变压器的4脚，第二电阻的另一端分别电性连接至第四电阻的一端及第四二极管的负极；第三电阻并联于第三二极管；第四电阻并联于第四二极管；第五电阻的一端分别电性连接至第三电阻的另一端、第三二极管正极及LLC上半桥MOS管的栅极，第五电阻的另一端分别电性连接至隔离驱动变压器的5脚、LLC上半桥MOS管的源极、LLC下半桥MOS管的漏极；第六电阻的一端分别电性连接至第四电阻的另一端、第四二极管正极及LLC下半桥MOS管的栅极，第六电阻的另一端分别电性连接至隔离驱动变压器的3脚、LLC下半桥MOS管的源极并接地；所述LLC上半桥MOS管的源极电性连接至LLC下半桥MOS管的漏极；所述LLC上半桥MOS管的漏极电性连接至PFC输出口。
在本发明的一实施例中，所述整流滤波电路包括：第三电容、第五二极管、第六二极管、第七二极管、第八二极管、第四电容及第五电容；所述第三电容的一端电性连接至LLC谐振变换电路的输出端，所述第三电容的另一端分别电性连接至第五二极管负极及第六二极管正极；所述第四电容的一端电性连接至第六二极管负极，并通过第一连接器电性连接至两路LED灯条，所述第四电容的另一端接地；所述第五电容的一端电性连接至第七二极管负极，并通过第二连接器电性连接至两路LED灯条，所述第五电容的另一端电性连接至第八二极管正极及通过第二连接器电性连接至两路LED灯条。
在本发明的一实施例中，所述第三电容为灯条压差平衡电容；所述第五二极管、第六二极管、第七二极管、第八二极管为输出桥式整流二极管；所述第四电容和第五电容为输出滤波电容。
在本发明的一实施例中，所述控制电路包括第七电阻和一控制器；所述第七电阻为电流采样电阻，第七电阻的一端电性连接至所述控制器的一端，并通过第一连接器电性连接至两路LED灯条，第七电阻的另一端接地；所述控制器的另一端电性连接至LLC谐振变换电路的输入端。
在本发明的一实施例中，所述控制器通过第七电阻上的电位获得LED电流值并调节控制器的输出信号，以进一步调节LLC谐振变换电路的输出。
 有益效果
本发明所述基于LLC的背光驱动控制电路通过优化背光驱动拓扑，并采用LLC谐振直接驱动2路LED背光灯条方式，以简化背光驱动架构，提高系统工作效率，并降低系统成本。
 附图说明
图1为本发明一实施例的基于LLC的背光驱动控制电路的模块连接示意图；
图2为本发明所述实施例的基于LLC的背光驱动控制电路的具体实施电路图。
 本发明的最佳实施方式
下面结合附图对本发明提供的基于LLC的背光驱动控制电路的具体实施方式做详细说明。
参见图1和图2所示，本发明提供一种基于LLC（谐振转换电路）的背光驱动控制电路，其包括：一LLC谐振变换电路110，用于驱动电流进行周期变换；一整流滤波电路120，用于平衡LED灯条压差平衡；一控制电路140，用于通过恒流反馈实现恒流反馈；两路LED灯条130，用于提供LED背光光亮；所述LLC谐振变换电路110、所述整流滤波电路120、所述两路LED灯条130和所述控制电路140依次连接，并形成一循环回路；所述LLC谐振变换电路110向两路LED灯条130输入供电电流；通过获取流经采样电阻的电流以控制LLC谐振变换电路110的输出占空比，进而控制输出至两路LED灯条130的电压。
具体而言，在本发明的一实施例中，所述LLC谐振变换电路110中的第一电容C1根据控制电路140反馈的电流通过隔离驱动变压器TS1来驱动LLC上下半桥MOS管中的电流周期性交替变换。当电流为正半周期时导通LLC上半桥MOS管M1；当电流为负半周期时导通LLC下半桥MOS管M2。以下将具体说明LLC谐振变换电路110的结构连接关系。
所述LLC谐振变换电路110包括第一二极管D1、第一电容C1、第二二极管D2、隔离驱动变压器TS1、LLC上下半桥MOS管、第二电容C2及LLC谐振变压器TS2；所述第一二极管D1的正极接地，所述第一二极管D1的负极分别电性连接至所述第一电容C1的一端及控制电路140输出端；所述第一电容C1的另一端电性连接至隔离驱动变压器TS1的一端（如图2中隔离驱动变压器TS1的1脚）；所述第二二极管D2的正极接地，所述第二二极管D2的负极分别电性连接至隔离驱动变压器TS1的一端（如图2中隔离驱动变压器TS1的2脚）及控制电路140输出端；所述隔离驱动变压器TS1的另一端（如图2中隔离驱动变压器TS1的5脚）电性连接至LLC上下半桥MOS管的一端；所述LLC上下半桥MOS管的另一端分别电性连接至LLC谐振变压器TS2的一端（如图2中隔离驱动变压器TS1的7脚）及第二电容C2的一端；所述第二电容C2的另一端电性连接至LLC谐振变压器TS2的一端（如图2中隔离驱动变压器TS1的8脚）；所述LLC谐振变压器TS2的另一端电性连接至整流滤波电路120输入端。在本实施例中，隔离驱动变压器TS1为1：1：1的变压器，第一二极管D1和第二二极管D2采用BAT54型二极管，第一电容C1为1μF的电容。
其中，第一二极管D1和第二二极管D2为优选元件。由于控制电路140的两路驱动通过隔离驱动变压器TS1、第一电容C1而电性连接至LLC上半桥MOS管M1和LLC下半桥MOS管M2，且因LC谐振的危险因素的存在而可能造成驱动电压过高。因此，在本实施例中，设置有第一二极管D1和第二二极管D2，从而限制LLC上半桥MOS管M1和LLC下半桥MOS管M2的栅极驱动电压，进而保证整个电路的安全稳定性。
在本实施例中，所述LLC上下半桥MOS管包括：第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4、第三二极管D3、第四二极管D4、第五电阻R5、第六电阻R6、LLC上半桥MOS管M1及LLC下半桥MOS管M2；第一电阻R1的一端电性连接至隔离驱动变压器TS1的6脚，第一电阻R1的另一端分别电性连接至第三电阻R3的一端及第三二极管D3的负极；第二电阻R2的一端电性连接至隔离驱动变压器TS1的4脚，第二电阻R2的另一端分别电性连接至第四电阻R4的一端及第四二极管D4的负极；第三电阻R3并联于第三二极管D3；第四电阻R4并联于第四二极管D4；第五电阻R5的一端分别电性连接至第三电阻R3的另一端、第三二极管D3正极及LLC上半桥MOS管M1的栅极，第五电阻R5的另一端分别电性连接至隔离驱动变压器TS1的5脚、LLC上半桥MOS管M1的源极、LLC下半桥MOS管M2的漏极；第六电阻R6的一端分别电性连接至第四电阻R4的另一端、第四二极管D4正极及LLC下半桥MOS管M2的栅极，第六电阻R6的另一端分别电性连接至隔离驱动变压器TS1的3脚、LLC下半桥MOS管M2的源极并接地；所述LLC上半桥MOS管M1的源极电性连接至LLC下半桥MOS管M2的漏极；所述LLC上半桥MOS管M1的漏极电性连接至PFC输出口（即PFC OUT）。其中，在本实施例中，第三二极管D3和第四二极管D4为1N4148型二极管；LLC上半桥MOS管M1和LLC下半桥MOS管M2为12N60型MOS管；第一电阻R1和第二电阻R2为10欧的电阻，第三电阻R3和第四电阻R4为47欧的电阻，第五电阻R5和第六电阻R6为10K欧的电阻；第二电容C2为33nF/1000V的电容。
在上述LLC上下半桥MOS管中，第三电阻R3、第四电阻R4、第三二极管D3、第四二极管D4形成一放电电路。在现有技术中，如果在LLC上下半桥MOS管关断时，LLC上下半桥MOS管的栅极和源极有寄生电容（Cgs），于是，LLC上下半桥MOS管的栅极电压不会迅速降低至零，还存在一段时间进行导通。而在本发明实施例中，由于设置有放电电路，因此，LLC上下半桥MOS管的栅极和源极的寄生电容通过第三二极管D3和第四二极管D4进行放电，从而降低误导通的风险。
继续参见图所示，所述整流滤波电路120包括：第三电容C3、第五二极管D5、第六二极管D6、第七二极管D7、第八二极管D8、第四电容C4及第五电容C5；所述第三电容C3的一端电性连接至LLC谐振变换电路110的输出端，所述第三电容C3的另一端分别电性连接至第五二极管D5负极及第六二极管D6正极；所述第四电容C4的一端电性连接至第六二极管D6负极，并通过第一连接器CON1电性连接至第一路LED灯条（图未示），所述第四电容C4的另一端接地；所述第五电容C5的一端电性连接至第七二极管D7负极，并通过第二连接器CON2电性连接至第二路LED灯条（图未示），所述第五电容C5的另一端电性连接至第八二极管D8正极及通过第二连接器CON2电性连接至第二路LED灯条。其中，在本实施例中，第三电容C3、第四电容C4和第五电容C5为1μF/250V的电容；第五二极管D5、第六二极管D6、第七二极管D7和第八二极管D8为600V/4A型二极管。
在本实施例中，所述第三电容C3可以为灯条压差平衡电容；所述第五二极管D5、第六二极管D6、第七二极管D7、第八二极管D8为输出桥式整流二极管；所述第四电容C4和第五电容C5为输出滤波电容。
在此电路中，由于设置有第三电容C3，因此通过该电容来平衡两路LED灯条130的电压差。当两路LED灯条130的电压完全一样时，第三电蓉充放电平衡，第三电容C3上的电压为零；当两路LED灯条130有电压差时，若第二路LED灯条的电压大于第一路LED灯条时，则第三电容C3电压为左负右正，则在导通第一路LED灯条时，同时储能于灯条压差平衡第三电容C3中，在导通第二路LED灯条时，灯条压差平衡第三电容C3同时释放能量；当第二路LED灯条的电压小于第一路LED灯条时，则第三电容C3为左正右负，则在导通第一路LED灯条时，灯条压差平衡第三电容C3同时释放能量，在导通第二路LED灯条时，同时储能于灯条压差平衡第三电容C3中。
所述控制电路140包括第七电阻R7和一控制器141；所述第七电阻R7为电流采样电阻，第七电阻R7的一端电性连接至所述控制器141的一端，并通过第一连接器CON1电性连接至两路LED灯条130，第七电阻R7的另一端接地；所述控制器141的另一端电性连接至LLC谐振变换电路110的输入端。
进一步，结合图1和图2将对本实施例中的电路实现恒流控制的工作原理进行解释。
当LLC谐振变压器TS2处于正半周期时，电流由变压器的一端（如图2中LLC谐振变压器TS2的7脚）输入，次级电流由其另一端（如图2中LLC谐振变压器TS2的10脚）输出，导通第七二极管D7，给第五电容C5充电，同时通过第一连接器导通第一LED灯条，而此时第三电容C3放电并流回LLC谐振变压器TS2的另一端（如图2中LLC谐振变压器TS2的9脚）。当LLC谐振变压器TS2处于负半周期时，次级电流由LLC谐振变压器TS2的另一端（如图2中LLC谐振变压器TS2的9脚）流出，给第三电容C3充电，同时流经第六二极管D6给第四电容C4充电，并通过第二连接器导通第二LED灯条，流经第二LED灯条的电流经过第七电阻R7到地后，经过第八二极管D8回到LLC谐振变压器TS2的另一端（如图2中LLC谐振变压器TS2的10脚），形成一周期环路，该周期环路实现了第一LED灯条和第二LED灯条。也就是说，在一个周期内，LLC谐振变压器TS2的正半周期和负半周期的电流一样，因而只需对其中一路LED灯条的电流进行采样，即可保证另一路LED灯条有同样的恒定电流。且，由于本发明所述电路未采用BOOST进行升压，因此不会产生严重的损耗即成本高的问题。
根据上文所述，所述控制器141通过第七电阻R7上的电位获得LED电流值并调节控制器141的输出信号，以进一步调节LLC谐振变换电路110的输出。也就是说，当通过检测第七电阻R7上电压值，所述控制器141相应地改变LLC谐振变化电路的输出，以改变整个环路的增益，实现LED的恒流。当采样电阻（即第七电阻R7）上所获得的电压大于一预设阈值时，所述控制器141输出一信号，以使隔离驱动变压器TS1的输出占空比降低；当采样电阻上所获得的电压小于或等于时，所述控制器141输出另一信号，以使隔离驱动变压器TS1的输出占控比升高。亦即，所述隔离驱动变压器TS1的输出占空比是受到控制器141的控制。
当隔离驱动变压器TS1的输出占空比发生改变时，LLC谐振变压器TS2的输出电压也相应地进行了微调改变。其中，LLC谐振变压器TS2通过其设置的初级匝数（NP）、次级匝数（NS）及漏感（LR，其寄生于LLC谐振变压器TS2中，并通过初次级绕组的耦合来调节）来改变LLC谐振变压器TS2输出至两路LED灯条130的电压。
另外，通过上述实施方式来有效地解决现有技术中两路BOOST拓扑恒流调光控制系统所存在的问题。本发明上述实施方式基于相同的工作原理也同样适用于四路LED背光驱动控制电路，具体方案在此不再赘述。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (8)

  1. 一种基于LLC的背光驱动控制电路，其中，所述电路包括：
    一LLC谐振变换电路，用于驱动电流进行周期变换；
    一整流滤波电路，用于平衡LED灯条压差平衡；
    一控制电路，用于通过恒流反馈实现恒流反馈；
    两路LED灯条，用于提供LED背光光亮；
    所述LLC谐振变换电路、所述整流滤波电路、所述两路LED灯条和所述控制电路依次连接，并形成一循环回路；所述LLC谐振变换电路向两路LED灯条输入供电电流；通过获取流经采样电阻的电流以控制LLC谐振变换电路的输出占空比，进而控制输出至两路LED灯条的电压；
    其中，所述LLC谐振变换电路包括第一二极管、第一电容、第二二极管、隔离驱动变压器、LLC上下半桥MOS管、第二电容及LLC谐振变压器；所述第一二极管的正极接地，所述第一二极管的负极分别电性连接至所述第一电容的一端及控制电路输出端；所述第一电容的另一端电性连接至隔离驱动变压器的一端；所述第二二极管的正极接地，所述第二二极管的负极分别电性连接至隔离驱动变压器的一端及控制电路输出端；所述隔离驱动变压器的另一端电性连接至LLC上下半桥MOS管的一端；所述LLC上下半桥MOS管的另一端分别电性连接至LLC谐振变压器的一端及第二电容的一端；所述第二电容的另一端电性连接至LLC谐振变压器的一端；所述LLC谐振变压器的另一端电性连接至整流滤波电路输入端；所述LLC上下半桥MOS管包括：第一电阻、第二电阻、第三电阻、第四电阻、第三二极管、第四二极管、第五电阻R5、第六电阻、LLC上半桥MOS管及LLC下半桥MOS管；第一电阻的一端电性连接至隔离驱动变压器的6脚，第一电阻的另一端分别电性连接至第三电阻的一端及第三二极管的负极；第二电阻的一端电性连接至隔离驱动变压器的4脚，第二电阻的另一端分别电性连接至第四电阻的一端及第四二极管的负极；第三电阻并联于第三二极管；第四电阻并联于第四二极管；第五电阻的一端分别电性连接至第三电阻的另一端、第三二极管正极及LLC上半桥MOS管的栅极，第五电阻的另一端分别电性连接至隔离驱动变压器的5脚、LLC上半桥MOS管的源极、LLC下半桥MOS管的漏极；第六电阻的一端分别电性连接至第四电阻的另一端、第四二极管正极及LLC下半桥MOS管的栅极，第六电阻的另一端分别电性连接至隔离驱动变压器的3脚、LLC下半桥MOS管的源极并接地；
    所述LLC上半桥MOS管的源极电性连接至LLC下半桥MOS管的漏极；所述LLC上半桥MOS管的漏极电性连接至PFC输出口；所述整流滤波电路包括：第三电容、第五二极管、第六二极管、第七二极管、第八二极管、第四电容及第五电容；所述第三电容的一端电性连接至LLC谐振变换电路的输出端，所述第三电容的另一端分别电性连接至第五二极管负极及第六二极管正极；所述第四电容的一端电性连接至第六二极管负极，并通过第一连接器电性连接至两路LED灯条，所述第四电容的另一端接地；所述第五电容的一端电性连接至第七二极管负极，并通过第二连接器电性连接至两路LED灯条，所述第五电容的另一端电性连接至第八二极管正极及通过第二连接器电性连接至两路LED灯条；所述控制电路包括第七电阻和一控制器；所述第七电阻为电流采样电阻，第七电阻的一端电性连接至所述控制器的一端，并通过第一连接器电性连接至两路LED灯条，第七电阻的另一端接地；所述控制器的另一端电性连接至LLC谐振变换电路的输入端；所述控制器通过第七电阻上的电位获得LED电流值并调节控制器的输出信号，以进一步调节LLC谐振变换电路的输出。
  2. 一种基于LLC的背光驱动控制电路，其特征在于，包括：
    一LLC谐振变换电路，用于驱动电流进行周期变换；
    一整流滤波电路，用于平衡LED灯条压差平衡；
    一控制电路，用于通过恒流反馈实现恒流反馈；
    两路LED灯条，用于提供LED背光光亮；
    所述LLC谐振变换电路、所述整流滤波电路、所述两路LED灯条和所述控制电路依次连接，并形成一循环回路；
    所述LLC谐振变换电路向两路LED灯条输入供电电流；通过获取流经采样电阻的电流以控制LLC谐振变换电路的输出占空比，进而控制输出至两路LED灯条的电压。
  3. 根据权利要求2所述的背光驱动控制电路，其特征在于，所述LLC谐振变换电路包括第一二极管、第一电容、第二二极管、隔离驱动变压器、LLC上下半桥MOS管、第二电容及LLC谐振变压器；
    所述第一二极管的正极接地，所述第一二极管的负极分别电性连接至所述第一电容的一端及控制电路输出端；
    所述第一电容的另一端电性连接至隔离驱动变压器的一端；
    所述第二二极管的正极接地，所述第二二极管的负极分别电性连接至隔离驱动变压器的一端及控制电路输出端；
    所述隔离驱动变压器的另一端电性连接至LLC上下半桥MOS管的一端；
    所述LLC上下半桥MOS管的另一端分别电性连接至LLC谐振变压器的一端及第二电容的一端；
    所述第二电容的另一端电性连接至LLC谐振变压器的一端；
    所述LLC谐振变压器的另一端电性连接至整流滤波电路输入端。
  4. 根据权利要求3所述的背光驱动控制电路，其特征在于，所述LLC上下半桥MOS管包括：第一电阻、第二电阻、第三电阻、第四电阻、第三二极管、第四二极管、第五电阻、第六电阻、LLC上半桥MOS管及LLC下半桥MOS管；
    第一电阻的一端电性连接至隔离驱动变压器的6脚，第一电阻的另一端分别电性连接至第三电阻的一端及第三二极管的负极；
    第二电阻的一端电性连接至隔离驱动变压器的4脚，第二电阻的另一端分别电性连接至第四电阻的一端及第四二极管的负极；
    第三电阻并联于第三二极管；第四电阻并联于第四二极管；
    第五电阻的一端分别电性连接至第三电阻的另一端、第三二极管正极及LLC上半桥MOS管的栅极，第五电阻的另一端分别电性连接至隔离驱动变压器的5脚、LLC上半桥MOS管的源极、LLC下半桥MOS管的漏极；
    第六电阻的一端分别电性连接至第四电阻的另一端、第四二极管正极及LLC下半桥MOS管的栅极，第六电阻的另一端分别电性连接至隔离驱动变压器的3脚、LLC下半桥MOS管的源极并接地；
    所述LLC上半桥MOS管的源极电性连接至LLC下半桥MOS管的漏极；
    所述LLC上半桥MOS管的漏极电性连接至PFC输出口。
  5. 根据权利要求2所述的背光驱动控制电路，其特征在于，所述整流滤波电路包括：第三电容、第五二极管、第六二极管、第七二极管、第八二极管、第四电容及第五电容；
    所述第三电容的一端电性连接至LLC谐振变换电路的输出端，所述第三电容的另一端分别电性连接至第五二极管负极及第六二极管正极；
    所述第四电容的一端电性连接至第六二极管负极，并通过第一连接器电性连接至两路LED灯条，所述第四电容的另一端接地；
    所述第五电容的一端电性连接至第七二极管负极，并通过第二连接器电性连接至两路LED灯条，所述第五电容的另一端电性连接至第八二极管正极及通过第二连接器电性连接至两路LED灯条。
  6. 根据权利要求5所述的背光驱动控制电路，其特征在于，所述第三电容为灯条压差平衡电容；所述第五二极管、第六二极管、第七二极管、第八二极管为输出桥式整流二极管；所述第四电容和第五电容为输出滤波电容。
  7. 根据权利要求2所述的背光驱动控制电路，其特征在于，所述控制电路包括第七电阻和一控制器；
    所述第七电阻为电流采样电阻，第七电阻的一端电性连接至所述控制器的一端，并通过第一连接器电性连接至两路LED灯条，第七电阻的另一端接地；
    所述控制器的另一端电性连接至LLC谐振变换电路的输入端。
  8. 根据权利要求7所述的背光驱动控制电路，其特征在于，所述控制器通过第七电阻上的电位获得LED电流值并调节控制器的输出信号，以进一步调节LLC谐振变换电路的输出。
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