WO2015100805A1 - 反激式升压电路、led背光驱动电路及液晶显示器 - Google Patents

反激式升压电路、led背光驱动电路及液晶显示器 Download PDF

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Publication number
WO2015100805A1
WO2015100805A1 PCT/CN2014/070674 CN2014070674W WO2015100805A1 WO 2015100805 A1 WO2015100805 A1 WO 2015100805A1 CN 2014070674 W CN2014070674 W CN 2014070674W WO 2015100805 A1 WO2015100805 A1 WO 2015100805A1
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Prior art keywords
switching elements
ground
terminal
output
module
Prior art date
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Ceased
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PCT/CN2014/070674
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English (en)
French (fr)
Inventor
王照
曹丹
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to KR1020167020875A priority Critical patent/KR101838548B1/ko
Priority to GB1610371.5A priority patent/GB2535932B/en
Priority to US14/346,714 priority patent/US9232583B2/en
Priority to JP2016561052A priority patent/JP6219540B2/ja
Priority to DE112014006084.4T priority patent/DE112014006084B4/de
Priority to RU2016125812A priority patent/RU2635067C1/ru
Publication of WO2015100805A1 publication Critical patent/WO2015100805A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • 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
    • 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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • 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]

Definitions

  • the present invention relates to a flyback boosting circuit, an LED backlight driving circuit including the flyback boosting circuit, and the LED backlight driving circuit LCD monitor.
  • the backlight of a conventional liquid crystal display device uses a cold cathode fluorescent lamp (CCFL).
  • CCFL backlight due to the shortcomings of CCFL backlight, such as poor color reproduction ability, low luminous efficiency, high discharge voltage, poor discharge characteristics at low temperature, and long stable gradation time, a backlight technology using LED backlight has been developed.
  • the LED backlight is disposed opposite to the liquid crystal display panel, so that the LED backlight provides a display light source to the liquid crystal display panel.
  • the LED backlight drive circuit generally includes a boost circuit that converts the voltage supplied by the power supply module to a desired output voltage for supply to the LED unit.
  • One of the more widely used booster circuits is a flyback converter.
  • the flyback transformer is also called an inductive energy storage transformer. It is a type of circuit that is only stored during the main switch.
  • the flyback converter has the following features: (1) The circuit has a minimum of components; (2) The circuit has high reliability; (3) The circuit has the lowest cost.
  • a conventional flyback boosting circuit as shown in FIG. 1 includes a transformer, a MOSFET switch Q, and an output diode Do.
  • the transformer includes a primary coil P and a secondary coil S, and a secondary coil P and a primary coil S.
  • the turns ratio is K; the same name of the primary coil P is connected to the drain of the MOS switch Q, the other end of the primary coil P is connected to the input voltage Vin, the source of the MOS switch Q is connected to the ground, and the gate is connected by a pulse signal.
  • the input voltage Vin is also connected to the ground through a filter capacitor C; the same end of the secondary coil S is connected to the positive terminal of the output diode Do, and the other end is connected to the ground; the negative terminal of the output diode Do is also connected to the ground.
  • Fig. 2 is a current waveform diagram of the flyback booster circuit as described above.
  • DRV is a control signal for controlling MOS transistor Q to be turned on or off;
  • Ip is a current signal in primary coil P;
  • Is is a current signal in secondary coil S.
  • the turn-on time, Toff refers to the turn-off time of the MOS switch Q.
  • the parameters K and D need to be considered when designing the boost circuit. When the value of K is determined, the value of D needs to be designed to be greater than 50% to achieve boost. the goal of. In the existing circuit, a single primary coil and a single switching element are used. When the value of D is designed to be greater than 50%, a large amount of heat is generated during the opening process of the switching element, so the value of D is generally limited to 50% or less. The range of the output voltage Vout is limited.
  • a flyback boosting circuit includes a transformer, a switch module, a driving module, and an output diode, and the duty ratio of the switch module is D, where
  • the transformer includes n primary coils and one secondary coil, the switch module includes n switching elements, and the same-named ends of the n primary coils are respectively connected to the n switching elements in a one-to-one correspondence, the n primary The other ends of the coils are respectively connected to an input voltage, and the turns ratio of the secondary coils to each of the primary coils is K;
  • the driving modules respectively provide control signals to the n switching elements to control the n
  • the switching element sequentially turns on one of the times when the duty ratio is D, the sum of the duty ratios of the n switching elements is D
  • n 2 to 5.
  • the duty ratios of the n switching elements are equal.
  • the switching element is a MOS transistor, the drain of the MOS transistor is connected to the same end of the primary coil, the source is connected to the ground, and the gate is connected to the control signal.
  • the input voltage is connected to the ground through a filter capacitor.
  • Another aspect of the present invention provides an LED backlight driving circuit including a power module and a boosting circuit, wherein the boosting circuit converts a voltage supplied from the power module into a required output voltage to be supplied to the LED unit, wherein
  • the booster circuit is a flyback booster circuit as described above.
  • the LED unit is a plurality of LED strings connected in parallel, wherein each LED string comprises a plurality of LEDs connected in series; each LED string is electrically grounded through a resistor, wherein a negative end of each LED string and a resistor Connect, the other end of the resistor is electrically grounded.
  • a liquid crystal display including an LED backlight, wherein the LED backlight employs an LED backlight driving circuit as described above.
  • the transformer adopts a plurality of primary coils and a plurality of switching elements, and when the transformer performs energy conversion, it breaks through the limitation of the duty ratio of the current single switching element, effectively Reduce the problem of large heat generation of the switch module and increase the output voltage range.
  • FIG. 1 is a circuit diagram of a conventional flyback booster circuit.
  • 2 is a current waveform diagram of the flyback booster circuit shown in FIG. 1.
  • 3 is a circuit diagram of a flyback boost circuit provided by an embodiment of the present invention.
  • 4 is a current waveform diagram of the flyback booster circuit shown in FIG.
  • FIG. 5 is a connection module diagram of an LED backlight driving circuit according to an embodiment of the present invention.
  • the concept of the present invention is to use a plurality of primary coils for energy conversion in a transformer, and a plurality of primary coils are respectively controlled by a plurality of switching elements to break through the existing single switching elements.
  • the duty cycle is limited to less than 50%, increasing the output voltage range.
  • the technical solution provided by the present invention is a flyback boosting circuit including a transformer, a switch module, a driving module, and an output diode, the transformer including a primary coil and a secondary coil, and a secondary coil and a primary coil.
  • the turns ratio of the primary coil is connected to the switch module, and the switch module controls the primary coil to be turned on or off, and the other end of the primary coil is connected to an input voltage;
  • the driving module provides a control signal for turning on or off the switch module, the duty ratio of the switch module is D; the same name end of the secondary coil is connected to the positive end of the output diode, and the other end is grounded
  • An output capacitor is further connected between the negative terminal of the output diode and the ground, and a negative terminal of the output diode provides an output voltage to the load;
  • the transformer has n primary coils P1 PPn
  • the switch module has n switching elements Q1 ⁇ Qn, and the same-name ends of the n primary coils are respectively connected with the n switching elements in one-to-one correspondence, the n
  • the other ends of the primary coils are respectively connected to the input voltage Vin, and the turns ratio of the secondary coils to each of the primary coils is K; the driving modules respectively provide control signals DRV1
  • the on-time of the single primary coil is divided into the sum of the on-times of the plurality of primary coils, that is, the turn-on time of each of the switching elements is reduced, and the problem of large heat generation of the switch module is effectively reduced;
  • the duty cycle D of the switch module can be designed to be more than 50%, which increases the range of the output voltage.
  • FIG. 3 is a circuit diagram of the flyback boosting circuit provided in this embodiment.
  • the present invention is specifically described by taking the value of n as a specific example. As shown in FIG.
  • the flyback boosting circuit 20 includes a transformer 21, a switch module 22, a driving module 23, and an output diode Do; wherein the transformer 21 has two primary coils P1, P2 and a secondary coil S, the switch module 22 includes two MOS transistors Q1, Q2; the winding directions of the two primary coils P1, P2 are opposite, that is, the same end of the two primary coils P1, P2 are respectively connected to two MOS transistors Ql
  • the drain of Q2 the other ends of the two primary coils P1, P2 are respectively connected to the input voltage Vin, the same end of the secondary coil S is connected to the positive end of the output diode Do, the other end is connected to the ground, and the secondary coil
  • the P1 and P2 turns ratios of S and each primary coil are both 1; an output capacitor Co is also connected between the negative terminal of the output diode Do and the ground, and the negative terminal of the output diode Do supplies an output voltage Vout to the load; MOS The sources of the transistors Q1 and Q2 are respectively connected
  • the input voltage Vin is also connected to ground through a filter capacitor C.
  • the duty ratio of the switch module 22 is D.
  • the control signals DRV1 and DRV2 provided by the driving module 23 respectively control the MOS transistors Q1 and Q2, and sequentially turn on the MOS transistors.
  • the following describes the operation of the flyback booster circuit as described above.
  • the primary coil and the secondary coil do not have current flowing at the same time, so as shown in FIG.
  • the illustrated flyback boosting circuit when one of the MOS transistors Q1, Q2 is turned on, a current flows in the primary winding P1 or P2, and the same-name end of P1 or P2 is low, and the secondary winding S The same name end is low, the output diode Do is turned off; when the M0S transistors Q1 and Q2 are simultaneously turned off, the same name of the secondary winding S is high, the output diode Do is turned on, and the output voltage Vout is supplied to the load and the output capacitance Co Charging, when the output diode Do of the next cycle is turned off, the output capacitor Co supplies a voltage to the load.
  • DRV1 is a control signal that controls whether MOS transistor Q1 is turned on or off
  • DRV2 is a control signal that controls MOS transistor Q2 to be turned on or off
  • Ipl is a current signal in primary coil P1
  • IP2 is a current signal in primary coil P2
  • Is is Current signal in the stage coil S.
  • the relationship between the input voltage and the output voltage is
  • the duty ratio D of the switch module can be split into the sum of the duty ratios D1 and D2 of the plurality of switching elements, so that the duty ratio of the switch module is limited when the duty ratio of the single switching element is limited to 50% or less. D can break the 50% limit. For example, when the duty cycle D of the switch module is designed to be 70%, D1 can be designed to be 30% and D2 is 40%; or D1 and D2 are both 35%; The circuit structure can reduce the opening time of a single switching element, effectively reducing the problem of large heat generation of the switching module; at the same time, increasing the range of the output voltage.
  • FIG. 5 is a connection module diagram of an LED backlight driving circuit provided by the embodiment. As shown in FIG.
  • the LED backlight driving circuit includes a power module 1 and a boosting circuit 2, and the boosting circuit 2 converts the input voltage Vin provided by the power module 1 into a required output voltage Vout and supplies it to the LED unit.
  • the booster circuit 2 is the flyback booster circuit 20 provided by the present invention.
  • the LED unit may be a plurality of LED strings in one or parallel connection, each LED string includes a plurality of LEDs connected in series; and each LED string is electrically grounded through a resistor, wherein the negative end of each LED string is The resistor is connected, and the other end of the resistor is electrically grounded.
  • the transformer adopts a plurality of primary coils and a plurality of switching elements, and breaks through the current peak current of a single primary coil when the transformer performs energy conversion.
  • the limitation and the limitation of the duty ratio of a single switching element effectively reduce the problem of large heat generation of the switching module and can increase the output voltage range; the circuit can be effectively applied to the LED backlight driving circuit.
  • the term "comprising”, “comprising”, or any other variants thereof is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal (AREA)

Abstract

一种反激式升压电路（20），包括变压器（21）、开关模块（22）、驱动模块（23）以及输出二极管（Do），变压器（21）具有n个初级线圈（Pl、P2）和1个次级线圈（S），开关模块（22）具有n个开关元件（Ql、Q2）；n个初级线圈（P1、P2）的同名端分别与n个开关元件（Ql、Q2）一一对应连接，初级线圈（Pl、P2）的另一端连接输入电压（Vin）；次级线圈（S）的同名端连接到输出二极管（Do）的正端，另一端与地连接；输出二极管（Do）的负端与地之间连接有一输出电容（Co）；驱动模块（23）分别向n个开关元件（Ql、Q2）提供控制信号（DRV1、DRV2），以控制n个开关元件（Q1、Q2）在占空比为D的时间内依次开启其中的一个，n个开关元件（Ql、Q2）的占空比之和为D，其中，n为大于或等于2的整数。该反激式升压电路（20）能够有效地降低开关模块（22）发热量大的问题，并且能够提高输出电压的范围。

Description

反激式升压电路、 LED背光驱动电路及液晶显示器 技术领域 本发明涉及一种反激式升压电路、 包括所述反激式升压电路的 LED背光驱动 电路， 以及具备该 LED背光驱动电路的液晶显示器。
说
背景技术 随着技术的不断进步， 液晶显示设备的书背光技术不断得到发展。 传统的液 晶显示设备的背光源采用冷阴极荧光灯 （CCFL)。 但是由于 CCFL背光源存在色 彩还原能力较差、 发光效率低、 放电电压高、 低温下放电特性差、 加热达到稳 定灰度时间长等缺点， 当前已经开发出使用 LED背光源的背光源技术； 在液晶 显示设备中， LED背光源与液晶显示面板相对设置， 以使 LED背光源提供显示光 源给液晶显示面板。
LED背光源的驱动电路一般都包含有一升压电路， 该升压电路将电源模块提 供的电压转换成所需要的输出电压提供给 LED单元。 其中一种较为广泛应用的升 压电路为反激式变换器 (Flyback Converter) , 反激式变压器又称电感储能式变 压器， 它是一种在主开关管导通期间， 电路只储存而不传递能量， 在主开关管 关断期间， 才向负载传递能量的电路架构。 反激式变换器具有如下的特点： （1 ) 电路具有最少元件； （2 ) 电路具有高的可靠度； （3 ) 电路成本最低。
如图 1所示的一种现有的反激式升压电路， 包括变压器、 M0S开关管 Q以及 输出二极管 Do, 变压器包括初级线圈 P和次级线圈 S, 次级线圈 P与初级线圈 S 的匝数比为 K; 初级线圈 P的同名端连接到 M0S开关管 Q的漏极， 初级线圈 P的 另一端连接到输入电压 Vin, M0S开关管 Q源极与地连接，栅极由一脉冲信号 DRV 控制， 输入电压 Vin还通过一滤波电容 C与地连接； 次级线圈 S的同名端连接 到输出二极管 Do的正端， 另一端与地连接； 输出二极管 Do的负端与地之间还 连接有一输出电容 Co, 并且， 输出二极管 Do的负端向负载提供输出电压 Vout。
当 M0S开关管 Q被脉冲信号 DRV激励而开启时， 直流输入电压 Vin施加到变 压器的初级线圈 P上， 在变压器的次级线圈 S上感应出的电压使输出二极管 Do反 向偏置而阻断， 此时电源能量以磁能形式存储在初级线圈 P中； 当 MOS开关管 Q 关闭时， 初级线圈 P两端电压极性反向， 次级线圈 S上的电压极性颠倒， 使输出 二极管 Do导通， 储存在变压器中的能量释放给负载。 图 2是如上所述的反激式升 压电路的电流波形图。其中 DRV为控制 MOS晶体管 Q开启或关闭的控制信号； Ip 为初级线圈 P中的电流信号； Is为次级线圈 S中的电流信号。 在如图 1所示的电路 中， 输入电压和输出电压的关系为 V。ut = ^^，其中 K为次级线圈 S与初级线
1 - D
圈 P的匝数比， D为 MOS开关管 Q的占空比， D = Τοη ,Τοη是指 MOS开关管 Q
Ton + Toff
的开启时间， Toff是指 MOS开关管 Q的关闭时间， 在设计升压电路时需要考虑参 数 K和 D， 当 K的取值确定之后， D的取值需要设计为大于 50%才能实现升压的目 的。在现有的电路中， 采用单一初级线圈以及单一开关元件， 当将 D的取值设计 大于 50%， 开关元件的开启过程中产生大量热量， 因此 D的取值一般限制在 50% 以下， 这就限制了输出电压 Vout的范围。 发明内容 鉴于现有技术存在的不足， 本发明提供了一种能够有效地降低开关模块发 热量大的问题， 并且能够提高输出电压范围的反激式升压电路。 为了实现上述目的， 本发明采用了如下的技术方案： 一种反激式升压电路， 包括变压器、 开关模块、 驱动模块以及输出二极管， 所述开关模块的占空比为 D, 其中， 所述变压器包括 n个初级线圈和 1个次级线 圈， 所述开关模块包括 n个开关元件， 所述 n个初级线圈的同名端分别与所述 n 个开关元件一一对应连接， 所述 n个初级线圈的另一端分别连接到输入电压， 所述次级线圈与每一个初级线圈的匝数比均为 K;所述驱动模块分别向所述 n个 开关元件提供控制信号， 以控制所述 n个开关元件在占空比为 D的时间内依次 开启其中的一个， 所述 n个开关元件的占空比之和为 D; 所述次级线圈的同名端 连接到所述输出二极管的正端， 另一端与地连接； 所述输出二极管的负端与地 之间还连接有一输出电容， 并且， 所述输出二极管的负端向负载提供输出电； 其中， n为大于或等于 2的整数。 其中， n的取值为 2~5。 其中， n的取值为 2 其中， 所述 n个开关元件的占空比相等。 其中， 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极与初级线圈的 同名端连接， 源极与地连接， 栅极与所述控制信号连接。 其中， 所述输入电压通过一滤波电容与地连接。 本发明的另一方面是提供了一种 LED背光驱动电路， 包括电源模块以及升 压电路， 所述升压电路将所述电源模块提供的电压转换成所需要的输出电压提 供给 LED单元， 其中， 所述升压电路为如上所述的反激式升压电路。 其中， 所述 LED单元为并联的多个 LED串， 其中， 每个 LED串包括串联的 多个 LED; 每个 LED串分别通过一电阻电性接地， 其中， 每个 LED串的负端与电 阻连接， 电阻的另一端电性接地。 本发明的另一方面是提供一种液晶显示器， 所述液晶显示器包括 LED背光 源， 其中， 所述 LED背光源采用如上所述的 LED背光驱动电路。 本发明提供的反激式升压电路中， 其中的变压器采用了多个初级线圈以及 多个开关元件， 在变压器进行能量转换时， 突破了目前采用单一开关元件的占 空比的限制， 有效地降低开关模块发热量大的问题， 并且能够提高输出电压范 围。 附图说明 图 1是现有的一种反激式升压电路的电路图。 图 2是如图 1所示的反激式升压电路的电流波形图。 图 3是本发明一具体实施例提供的反激式升压电路的电路图。 图 4是如图 3所示的反激式升压电路的电流波形图。 图 5是本发明一具体实施例提供的 LED背光驱动电路的连接模块图。 具体实施方式 为了解决现有技术存在的问题， 本发明的构思是在变压器中采用多个初级 线圈进行能量转换， 多个初级线圈由多个开关元件分别控制， 以突破现有的单 一开关元件的占空比限制在 50%以下的问题， 提高输出电压范围。 基于以上构思， 本发明提供的技术方案为， 一种反激式升压电路， 包括变 压器、 开关模块、 驱动模块以及输出二极管， 所述变压器包括初级线圈和次级 线圈， 次级线圈与初级线圈的匝数比为 K; 所述初级线圈的同名端连接到所述开 关模块， 由所述开关模块控制所述初级线圈导通或断开， 所述初级线圈的另一 端连接到输入电压； 所述驱动模块提供一控制信号用于开启或关闭所述开关模 块， 所述开关模块的占空比为 D; 所述次级线圈的同名端连接到所述输出二极管 的正端， 另一端与地连接； 所述输出二极管的负端与地之间还连接有一输出电 容， 并且， 所述输出二极管的负端向负载提供输出电压； 其中， 所述变压器具有 n 个初级线圈 Pl~Pn， 所述开关模块具有 n 个开关元件 Ql~Qn， 所述 n个初级线圈的同名端分别与所述 n个开关元件一一对应连接， 所 述 n个初级线圈的另一端分别连接到所述输入电压 Vin,所述次级线圈与每一个 初级线圈的匝数比均为 K;所述驱动模块分别向所述 n个开关元件提供控制信号 DRVl-DRVn, 以控制所述 n个开关元件在占空比为 D的时间内依次开启其中的一 个， 所述 n个开关元件的占空比分别为 Dl~Dn， 并且 Dl+D2+〜+Dn=D; 其中， n 为大于或等于 2的整数。 在进行能量转换时， 通过将单一初级线圈的导通时间分为多个初级线圈的 导通时间之和， 即减少了每一个开关元件的开启时间， 有效地降低开关模块发 热量大的问题； 同时， 开关模块的占空比 D可以设计到 50%以上， 提高了输出电 压的范围。 比较优选的方案是，所述 n个开关元件的占空比相等，即 Dl=D2=〜=Dn=D/n。 比较优选的方案是， n的取值为 2~5。 更为优选的方案是， n的取值为 2。 更为优选的方案是， 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极 与初级线圈的同名端连接， 源极与地连接， 栅极与所述控制信号连接。 下面将对结合附图用实施例对本发明做进一步说明。 图 3是本实施例提供的反激式升压电路的电路图， 本实施例是以 n的取值 为 2作为具体例子对本发明进行具体说明的。 如图 3所示， 该反激式升压电路 20包括包括变压器 21、 开关模块 22、 驱 动模块 23以及输出二极管 Do; 其中， 变压器 21具有 2个初级线圈 Pl、 P2以及 一个次级线圈 S， 开关模块 22包括 2个 MOS晶体管 Ql、 Q2; 2个初级线圈 Pl、 P2的绕线方向相反， 即 2个初级线圈 Pl、 P2的同名端分别连接到 2个 M0S晶体 管 Ql、 Q2的漏极， 2个初级线圈 Pl、 P2的另一端分别连接到输入电压 Vin, 次 级线圈 S的同名端连接到输出二极管 Do的正端， 另一端与地连接， 并且， 次级 线圈 S与每一个初级线圈的 Pl、 P2匝数比均为 1 ; 输出二极管 Do的负端与地之 间还连接有一输出电容 Co, 并且， 输出二极管 Do 的负端向负载提供输出电压 Vout; MOS晶体管 Ql、 Q2的源极分别与地连接， 栅极分别连接收驱动模块 23提 供的控制信号 DRV1、 DRV2; 驱动模块 23提供的控制信号 DRV1、 DRV2用于开启 或关闭 M0S晶体管 Ql、 Q2， 从而控制初级线圈 Pl、 P2导通或断开。 在本实施例中， 输入电压 Vin还通过一滤波电容 C与地连接。 在本实施例中， 开关模块 22的占空比为 D, 在占空比为 D的开启时间 Ton 内， 驱动模块 23提供的控制信号 DRV1和 DRV2分别控制 M0S晶体管 Ql、 Q2， 依 次开启 M0S晶体管 Ql、 Q2的时间为 Tonl、 Τοη2， 使得 MOS晶体管 Ql、 Q2的占 空比分别为 Dl、 D2， 本实施例中 Dl=D2=D/2; 在另外的一些实施例中， D1和 D2 也可以是不相等的， 只要满足 D1+D2=D即可。 下面介绍如上所述的的反激式升压电路的工作过禾 '王: 根据反激式升压电路电路原理， 初级线圈和次级线圈不会同时有电流流过， 所以在如图 3所示的反激式升压电路中， 当 M0S晶体管 Ql、 Q2的其中一个开启 时， 初级线圈 P1或 P2中有电流流过， 并且 P1或 P2的同名端为低电位， 此时 次级线圈 S的同名端为低电位， 输出二极管 Do截止； 当 M0S晶体管 Q1和 Q2同 时关闭时， 次级线圈 S的同名端为高电位， 输出二极管 Do导通， 向负载提供输 出电压 Vout并对输出电容 Co充电， 在下一个周期的输出二极管 Do截止时， 由 输出电容 Co向负载提供电压。 图 4是本实施例提供的反激式升压电路的电流波形图。其中 DRV1为控制 M0S 晶体管 Q1开启或关闭的控制信号； DRV2为控制 M0S晶体管 Q2开启或关闭的控 制信号； Ipl为初级线圈 P1 中的电流信号； IP2为初级线圈 P2中的电流信号； Is为次级线圈 S中的电流信号。 在本实施例提供的反激式升压电路中， 输入电压和输出电压的关系为
Vout = in * g = Vin * (Z)l+Z)2) > D的取值越大， 则输出电压 Vout的范围越大； 由于
1 - D \ - (D\ + D2) 开关模块的占空比 D可以拆分成多个开关元件的占空比 Dl、 D2 之和， 因此在单 个开关元件的占空比受限于 50%以下的情况下， 开关模块的占空比 D可以突破 50%的限制， 例如， 开关模块的占空比 D设计为 70%时， 可以设计 D1为 30%、 D2 为 40%; 或者是 D1和 D2均为 35%; 基于以上， 这种电路结构可以减小单个开关 元件的开启时间， 有效地降低开关模块发热量大的问题； 同时， 提高了输出电 压的范围。 图 5是本实施例提供的 LED背光驱动电路的连接模块图。 如图 5所示， 该 LED背光驱动电路包括电源模块 1以及升压电路 2， 所述升压电路 2将所述电源 模块 1提供的输入电压 Vin转换成所需要的输出电压 Vout提供给 LED单元 3， 其中， 所述升压电路 2为本发明提供的反激式升压电路 20。 其中的 LED单元可以为一个或并联的多个 LED串， 每个 LED串包括串联的 多个 LED; 并且， 每个 LED串分别通过一电阻电性接地， 其中， 每个 LED串的负 端与电阻连接， 电阻的另一端电性接地。 综上所述， 本发明提供的反激式升压电路中， 其中的变压器采用了多个初 级线圈以及多个开关元件， 在变压器进行能量转换时， 突破了目前采用单一初 级线圈的峰值电流的限制以及单一开关元件的占空比的限制， 有效地降低开关 模块发热量大的问题， 并且能够提高输出电压范围； 该电路能够有效的应用于 LED背光驱动电路中。 需要说明的是， 在本文中， 术语 "包括"、 "包含"或者其任何其他变体意 在涵盖非排他性的包含， 从而使得包括一系列要素的过程、 方法、 物品或者设 备不仅包括那些要素， 而且还包括没有明确列出的其他要素， 或者是还包括为 这种过程、 方法、 物品或者设备所固有的要素。 在没有更多限制的情况下， 由 语句 "包括一个…… " 限定的要素， 并不排除在包括所述要素的过程、 方法、 物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式， 应当指出， 对于本技术领域的普通 技术人员来说， 在不脱离本申请原理的前提下， 还可以做出若干改进和润饰， 这些改进和润饰也应视为本申请的保护范围。

Claims

权 利 要 求 书
1、 一种反激式升压电路， 包括变压器、 开关模块、 驱动模块以及输出二极 管， 所述开关模块的占空比为 D, 其中， 所述变压器包括 n个初级线圈和 1个次级线圈， 所述开关模块包括 n个开 关元件， 所述 n个初级线圈的同名端分别与所述 n个开关元件一一对应连接， 所述 n个初级线圈的另一端分别连接到输入电压， 所述次级线圈与每一个初级 线圈的匝数比均为 K; 所述驱动模块分别向所述 n个开关元件提供控制信号， 以控制所述 n个开 关元件在占空比为 D的时间内依次开启其中的一个， 所述 n个开关元件的占空 比之和为 D; 所述次级线圈的同名端连接到所述输出二极管的正端， 另一端与地连接； 所述输出二极管的负端与地之间还连接有一输出电容， 并且， 所述输出二极管 的负端向负载提供输出电； 其中， n为大于或等于 2的整数。
2、 根据权利要求 1所述的反激式升压电路， 其中， n的取值为 2~5。
3、 根据权利要求 1所述的反激式升压电路， 其中， n的取值为 2。
4、 根据权利要求 1所述的反激式升压电路， 其中， 所述 n个开关元件的占 空比相等。
5、 根据权利要求 4所述的反激式升压电路， 其中， 所述开关元件为 M0S晶 体管， 所述 M0S 晶体管的漏极与初级线圈的同名端连接， 源极与地连接， 栅极 与所述控制信号连接。
6、 根据权利要求 3所述的反激式升压电路， 其中， 所述 2个开关元件的占 空比相等； 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极与初级线圈的 同名端连接， 源极与地连接， 栅极与所述控制信号连接。
7、 根据权利要求 5所述的反激式升压电路， 其中， 所述输入电压通过一滤 波电容与地连接。
8、 一种 LED背光驱动电路， 包括电源模块以及升压电路， 所述升压电路将 所述电源模块提供的电压转换成所需要的输出电压提供给 LED单元， 其中， 所 述升压电路包括变压器、 开关模块、 驱动模块以及输出二极管， 所述开关模块 的占空比为 D, 其中， 所述变压器包括 n个初级线圈和 1个次级线圈， 所述开关模块包括 n个开 关元件， 所述 n个初级线圈的同名端分别与所述 n个开关元件一一对应连接， 所述 n个初级线圈的另一端分别连接到输入电压， 所述次级线圈与每一个初级 线圈的匝数比均为 K; 所述驱动模块分别向所述 n个开关元件提供控制信号， 以控制所述 n个开 关元件在占空比为 D的时间内依次开启其中的一个， 所述 n个开关元件的占空 比之和为 D; 所述次级线圈的同名端连接到所述输出二极管的正端， 另一端与地连接； 所述输出二极管的负端与地之间还连接有一输出电容， 并且， 所述输出二极管 的负端向负载提供输出电； 其中， n为大于或等于 2的整数。
9、 根据权利要求 8所述的 LED背光驱动电路， 其中， n的取值为 2~5。
10、 根据权利要求 8所述的 LED背光驱动电路， 其中， n的取值为 2。
11、 根据权利要求 8所述的 LED背光驱动电路， 其中， 所述 n个开关元件 的占空比相等。
12、根据权利要求 1 1所述的 LED背光驱动电路，其中，所述开关元件为 M0S 晶体管， 所述 M0S 晶体管的漏极与初级线圈的同名端连接， 源极与地连接， 栅 极与所述控制信号连接。
13、 根据权利要求 10所述的 LED背光驱动电路， 其中， 所述 2个开关元件 的占空比相等； 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极与初级线 圈的同名端连接， 源极与地连接， 栅极与所述控制信号连接。
14、 根据权利要求 12所述的 LED背光驱动电路， 其中， 所述输入电压通过 一滤波电容与地连接。
15、 根据权利要求 8所述的 LED背光驱动电路， 其中， 所述 LED单元为并 联的多个 LED串， 其中， 每个 LED串包括串联的多个 LED; 每个 LED串分别通过 一电阻电性接地， 其中， 每个 LED 串的负端与电阻连接， 电阻的另一端电性接 地。
16、 一种液晶显示器， 包括 LED背光源， 其中， 所述 LED背光源的驱动电 路包括电源模块以及升压电路， 所述升压电路将所述电源模块提供的电压转换 成所需要的输出电压提供给 LED单元， 其中， 所述升压电路包括变压器、 开关 模块、 驱动模块以及输出二极管， 所述开关模块的占空比为 D, 其中， 所述变压器包括 n个初级线圈和 1个次级线圈， 所述开关模块包括 n个开 关元件， 所述 n个初级线圈的同名端分别与所述 n个开关元件一一对应连接， 所述 n个初级线圈的另一端分别连接到输入电压， 所述次级线圈与每一个初级 线圈的匝数比均为 K; 所述驱动模块分别向所述 n个开关元件提供控制信号， 以控制所述 n个开 关元件在占空比为 D的时间内依次开启其中的一个， 所述 n个开关元件的占空 比之和为 D; 所述次级线圈的同名端连接到所述输出二极管的正端， 另一端与地连接； 所述输出二极管的负端与地之间还连接有一输出电容， 并且， 所述输出二极管 的负端向负载提供输出电； 其中， n为大于或等于 2的整数。
17、 根据权利要求 16所述的液晶显示器， 其中， n的取值为 2。
18、 根据权利要求 16所述的液晶显示器， 其中， 所述 n个开关元件的占空 比相等； 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极与初级线圈的同 名端连接， 源极与地连接， 栅极与所述控制信号连接。
19、 根据权利要求 17所述的液晶显示器， 其中， 所述 2个开关元件的占空 比相等； 所述开关元件为 M0S晶体管， 所述 M0S晶体管的漏极与初级线圈的同 名端连接， 源极与地连接， 栅极与所述控制信号连接。
20、 根据权利要求 18所述的液晶显示器， 其中， 所述输入电压通过一滤波 电容与地连接。
PCT/CN2014/070674 2013-12-30 2014-01-15 反激式升压电路、led背光驱动电路及液晶显示器 Ceased WO2015100805A1 (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108540114A (zh) * 2018-06-08 2018-09-14 南京国博电子有限公司 一种高功率射频开关

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104410269A (zh) * 2014-12-24 2015-03-11 陆俊 一种直流电源转换电路及装置
CN106507549A (zh) * 2016-12-29 2017-03-15 重庆奥海辉龙大数据有限公司 Led驱动电源及系统
CN106787704B (zh) * 2017-02-08 2023-10-27 广州致远电子股份有限公司 一种用于高耐压重叠式dc-dc变换器的电源启动系统
CN107493014A (zh) * 2017-09-11 2017-12-19 无锡华汇金泽电子科技有限公司 一种大功率输出的反激式电路
CN109640463B (zh) * 2019-02-25 2020-12-25 福州大学 一种混合式反激led驱动电路和准谐振控制方法
CN113436571B (zh) * 2020-03-18 2022-10-18 海信视像科技股份有限公司 显示装置及供电电路

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210492A (ja) * 2000-01-28 2001-08-03 Olympus Optical Co Ltd ストロボ充電回路
CN1575083A (zh) * 2003-05-26 2005-02-02 三菱电机株式会社 高亮度放电灯的点灯装置以及其点灯方法
CN101833929A (zh) * 2010-05-11 2010-09-15 福建捷联电子有限公司 一种液晶显示器单串led灯管推挽式直流高压驱动电路
CN201757975U (zh) * 2010-05-11 2011-03-09 福建捷联电子有限公司 一种液晶显示器单串led灯管推挽式直流高压驱动电路
WO2012155325A1 (en) * 2011-05-16 2012-11-22 Intersil Americas Inc. Dc/dc power converter with wide input voltage range

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03137710A (ja) * 1989-10-24 1991-06-12 Fujitsu General Ltd 高圧発生回路
JPH03226268A (ja) * 1990-01-31 1991-10-07 Hitachi Ltd スイツチングレギユレータ
US5563780A (en) * 1993-12-08 1996-10-08 International Power Systems, Inc. Power conversion array applying small sequentially switched converters in parallel
US5903448A (en) * 1997-08-20 1999-05-11 Lucent Technologies Inc. Four quadrant flyback converter, method of operation thereof and power plant employing the same
JP3588429B2 (ja) * 1999-11-30 2004-11-10 東芝テック株式会社 電力変換装置
JP4644950B2 (ja) * 2001-01-16 2011-03-09 大平電子株式会社 スイッチング電源装置
GB2377094B (en) * 2001-06-29 2003-07-30 Paul Morris Power converter
JP2003199345A (ja) * 2001-12-26 2003-07-11 Fiderikkusu:Kk スイッチング電源装置
US6940233B2 (en) * 2002-10-03 2005-09-06 Analog Microelectronics, Inc. Method and system of driving a CCFL
US7777422B2 (en) * 2005-08-24 2010-08-17 Mitsubishi Electric Corporation DC/DC converter device and discharge lamp lighting device
JP5103728B2 (ja) * 2005-11-24 2012-12-19 ウシオ電機株式会社 放電ランプ点灯装置
JP4785586B2 (ja) * 2006-03-23 2011-10-05 アルパイン株式会社 Ｌｅｄバックライト駆動装置
JP5148934B2 (ja) * 2007-06-20 2013-02-20 京セラ株式会社 マルチフェーズ型ｄｃ−ｄｃコンバータ
US8537572B2 (en) * 2007-09-28 2013-09-17 Enphase Energy, Inc. Method and apparatus for providing power conversion using an interleaved flyback converter with automatic balancing
KR100966339B1 (ko) * 2008-06-11 2010-06-28 삼성전기주식회사 조명 구동장치
WO2010014991A1 (en) * 2008-08-01 2010-02-04 Pixtronix, Inc. Circuits for control of light sources in displays
JP2010041814A (ja) * 2008-08-05 2010-02-18 Toyota Industries Corp 電源装置
US8120273B2 (en) * 2008-10-28 2012-02-21 Visteon Global Technologies, Inc. Light control system with PWM duty cycle control using current signal feedback
JP5006863B2 (ja) * 2008-11-25 2012-08-22 三菱電機株式会社 スイッチング電源装置
JP5903273B2 (ja) * 2009-02-26 2016-04-13 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． 共振コンバータ
CN101848574A (zh) * 2009-03-27 2010-09-29 北京京东方光电科技有限公司 发光二极管背光源的驱动装置和亮度调整方法
JP2011024306A (ja) * 2009-07-14 2011-02-03 Sharp Corp スイッチング電源装置
US8299730B2 (en) * 2010-02-09 2012-10-30 Power Integrations, Inc. Integrated on-time extension for non-dissipative bleeding in a power supply
CN102545670A (zh) * 2010-12-24 2012-07-04 章伟康 微逆变器功率级新型拓扑结构
KR101315207B1 (ko) * 2011-04-07 2013-10-08 (주) 이이시스 대기전력을 최소화하기 위한 플라이백 방식의 교류-직류 컨버터를 이용한 전원장치
JP6092604B2 (ja) * 2012-12-10 2017-03-08 ローム株式会社 Ｄｃ／ｄｃコンバータおよびその制御回路、それを用いた電源装置、電源アダプタおよび電子機器
CN203102817U (zh) * 2013-03-14 2013-07-31 深圳市华星光电技术有限公司 一种led背光驱动电路、背光模组和液晶显示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001210492A (ja) * 2000-01-28 2001-08-03 Olympus Optical Co Ltd ストロボ充電回路
CN1575083A (zh) * 2003-05-26 2005-02-02 三菱电机株式会社 高亮度放电灯的点灯装置以及其点灯方法
CN101833929A (zh) * 2010-05-11 2010-09-15 福建捷联电子有限公司 一种液晶显示器单串led灯管推挽式直流高压驱动电路
CN201757975U (zh) * 2010-05-11 2011-03-09 福建捷联电子有限公司 一种液晶显示器单串led灯管推挽式直流高压驱动电路
WO2012155325A1 (en) * 2011-05-16 2012-11-22 Intersil Americas Inc. Dc/dc power converter with wide input voltage range

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108540114A (zh) * 2018-06-08 2018-09-14 南京国博电子有限公司 一种高功率射频开关

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