CN101082714A - 驱动大型lcd显示屏背光设备的逆变器 - Google Patents

驱动大型lcd显示屏背光设备的逆变器 Download PDF

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CN101082714A
CN101082714A CNA2007100917843A CN200710091784A CN101082714A CN 101082714 A CN101082714 A CN 101082714A CN A2007100917843 A CNA2007100917843 A CN A2007100917843A CN 200710091784 A CN200710091784 A CN 200710091784A CN 101082714 A CN101082714 A CN 101082714A
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inverter
main inverter
phase
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signal
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陈伟
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AMERICAN MONOLITHIC POWER Inc
Monolithic Power Systems Inc
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    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
    • 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
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • 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
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
    • H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
    • 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

Abstract

本发明涉及在大型LCD显示屏中，驱动背光的两个异相逆变器。将每个逆变器的灯电流调节到实质上相同的电平，从而保证了在没有任何电流平衡装置的情况下获得一致的灯亮度。在工作过程中，两个逆变器的开关频率同步，并且保持异相状态。

Description

驱动大型LCD显示屏背光设备的逆变器
技术领域
本发明涉及放电灯领域，更具体地，涉及高效率地提供电能，以驱动放电灯，例如，冷阴极荧光灯(CCFL)、外电极荧光灯(EEFL)和平面荧光灯(FFL)。
背景技术
通常，在大型的液晶显示器(LCD)应用中，需要较长的CCFL、EEFL或FFL。这些灯需要较高的驱动电压。一种驱动长放电灯的方法是使用单个逆变器。然而，这种方法很难获得均匀的灯亮度。首先，这种方法很难平衡各个灯的每一端的灯电流。有时候，在每个灯的末端增加电流平衡变压器来平衡每个灯的电流，以获得均匀的亮度。然而，这增加了额外的成本和系统复杂性。同样，当按照单端结构驱动所有的放电灯时，变压器次级绕组的额定电压可能会过高，使其制造成本超出合理的范围。
为了实现大型LCD显示屏的最佳性价比，需要改进驱动放电灯的系统和方法。
发明内容
根据本发明的第一方案，提出了一种驱动单个或多个放电灯的方法，包括：以主逆变器驱动所述放电灯的一端，以从逆变器驱动所述放电灯的另一端；其中所述从逆变器的输出电压与所述主逆变器的输出电压异相，并且将所述主逆变器与所述从逆变器的输出电流独立地调节到实质上相同的电平。
根据本发明的第二方案，提出了一种用于驱动单个或多个放电灯的系统，包括：主逆变器，驱动所述放电灯的一端；和从逆变器，驱动所述放电灯的另一端；其中所述从逆变器的输出电压与所述主逆变器的输出电压异相，并且将所述主逆变器与所述从逆变器的输出电流独立地调节到实质上相同的电平。
附图说明
以下附图阐明了本发明的实施例。这些附图和实施例提供了本发明的一些范例，但本发明并不局限于这些范例。
图1示出了本发明的一个实施例。
图2示出了在一个大型LCD显示屏应用中实现本发明的一个实例。
具体实施方式
下面详细介绍在大型显示屏应用中，使用两个逆变器和相应的电路来获得均匀的灯亮度的系统和方法的实施例。在接下来的说明中，一些具体的细节(例如，实例电路和这些电路元件的实例值)都用于对本发明的实施例提供更好的理解。但是，本技术领域的普通技术人员可以理解，即使在缺少很多细节或者与其他方法、元件、材料等结合的情况下，也可以实现本发明。
通过结合具有代表性和示例性的系统、电路和方法，举例说明下列的实施例和方案。在不同的实施例中，减少或消除了上述问题，同时另外的实施例涉及其他的改进。
本发明涉及在大型显示器应用中、驱动放电灯从而实现均匀亮度的电路和方法。
本发明的系统具有两个异相逆变器。将每个逆变器的灯电流调节到实质上相同的电平，以保证不同的灯具有均匀的亮度。本发明不再需要额外的电流平衡装置。每一个逆变器都能够检测自己的故障状态，并将故障状态传达给另一个逆变器，从而保证得到适当的保护。在工作过程中，两个逆变器的开关频率同步，并且保持异相状态。在两个逆变器的开关频率达到实质上的同步之前，任何一个逆变器都不会开启。这防止了灯的异常输出波形。
图1为本发明系统的示意图。在系统中有两个逆变器。一个是主逆变器，另一个是从逆变器。主逆变器和从逆变器分别在其输出端产生高频、高压AC信号，分别驱动灯的一端。在灯的两端，AC信号的相位差实质上为180度的异相关系。将主逆变器和从逆变器的RMS输出电流调节到实质上相同的电平。
如图1所示，在主逆变器和从逆变器之间具有通信总线。通过这个通信总线，两个逆变器能够互相通信，从而达到实质上相同的输出电流、异相工作、以及当任一逆变器发生故障时的适当保护。图1中，每个逆变器模块均包括控制器、开关网络和能量储存单元。通常，两个逆变器模块中的开关网络和能量储存单元实质上相同；而两个逆变器模块中的控制器可以相同或不同。
图2示出了在一个简化的大型LCD显示屏应用中的本发明实施例。电路包括主逆变器和从属逆变器，两个逆变器都是全桥结构。然而，可以意识到逆变器还可以使用不同类型的已知结构、或者未来研发出的结构。每一个逆变器均包括由4个MOSFET开关(主逆变器中的M1、M2、M3和M4，从逆变器中的M1’、M2’、M3’和M4’)组成的全桥结构，变压器(主逆变器中的XFR，从逆变器中的XFR’)和谐振电容器(主逆变器中的C1、C2和C3，从逆变器中的C1’、C2’和C3’)。
每个逆变器分别感测其输出电压和电流。输出电压通过电容器分压器进行感测(主逆变器中的C1和C2，从逆变器中的C1’和C2’)，而电流是通过与次级绕组和电容器分压器的公共回路相串联的电阻器进行感测的(主逆变器中的Rs，从逆变器中的Rs’)。通过将每个逆变器的输出电流调节成实质上相同的基准电平(IREF)，可以获得均匀的灯亮度。主逆变器和从逆变器都可以检测故障状态，并在发生故障时，通过“故障”线路互相通信。例如，当检测出故障状态时，主逆变器或从逆变器可以使用FAULT线路来通知另外一个，从而采取适当的步骤。
从逆变器中的开关频率与其CLKIN引脚的输入同步(其中，CLKIN引脚从主控制器的CLKOUT引脚接收信号)，并与主逆变器中的开关频率保持异相状态。当检测出故障状态，或者两个开关频率不同步时，两个逆变器都不开启，或者它们的输出级均不产生开关波形。主逆变器还产生表示灯电流基准信号的IREF信号，并将该信号发送到从逆变器。所述IREF信号可以是PWM信号或DC电压信号。PWM信号是固定频率的方波信号，其占空比表示灯电流基准信号。当两个逆变器相距较远时，使用PWM信号产生的噪音较小。然而，PWM信号需要比DC电压信号更为复杂的电路。从逆变器接收来自主逆变器的IREF信号，并将其灯电流IREF调节到与主逆变器中的灯电流基本相同的电平上。尽管图2中所示的本发明实施例使用全桥结构，但是可以容易地将其延伸到其他类型的电路拓扑结构，例如半桥、推挽式和其他谐振逆变器拓扑。
在本发明中，介绍了一种具有两个逆变器(主逆变器和从逆变器)的系统，以便在大型显示屏应用中获得均匀的亮度。两个逆变器的开关频率实质上同步并具有180度的相移。将每个逆变器的灯电流调节为实质上相同的电平，以获得均匀的灯亮度。
上述本发明的说明书和应用仅仅是示例性的，并不用于限定本发明的范围。对公开的实施例进行变化和修改都是可能的，其他可行的选择性实施例和对实施例中元件的等同变化对本技术领域的普通技术人员而言是公知的。可以在不超出本发明的精神和保护范围前提下，对本发明所公开的实施例进行其他变化和修改。

Claims (18)

1.一种驱动单个或多个放电灯的方法，包括：
以主逆变器驱动所述放电灯的一端，以从逆变器驱动所述放电灯的另一端；其中所述从逆变器的输出电压与所述主逆变器的输出电压异相，并且将所述主逆变器与所述从逆变器的输出电流独立地调节到实质上相同的电平。
2.根据权利要求1所述的方法，还包括：
从所述主逆变器向所述从逆变器发送电流基准信号；其中所述电流基准信号代表所述主逆变器中的灯电流基准信号；以及
接收所述电流基准信号，并将所述从逆变器中的灯电流调节到与所述主逆变器中的灯电流实质上相同。
3.根据权利要求2所述的方法，其中所述电流基准信号是脉冲宽度调制PWM信号或DC电压信号。
4.根据权利要求1所述的方法，其中当所述主逆变器或所述从逆变器中发生故障时，同时关断所述主逆变器和所述从逆变器。
5.根据权利要求1所述的方法，还包括：
从所述主逆变器向所述从逆变器发送相位信号，其中所述相位信号代表所述主逆变器的开关频率和相位信息；以及
接收所述相位信号，对所述从逆变器进行调节，使得所述从逆变器的电压输出与所述主逆变器的电压输出实质上成180度的异相关系。
6.根据权利要求5所述的方法，其中只有在所述主逆变器和所述从逆变器中的开关频率实质上同步并且成180度的异相关系时，才同时开启所述主逆变器和所述从逆变器。
7.根据权利要求1所述的方法，其中所述主逆变器和所述从逆变器是全桥结构。
8.根据权利要求1所述的方法，其中所述主逆变器和所述从逆变器是半桥结构。
9.根据权利要求1所述的方法，其中所述主逆变器和所述从逆变器是推挽式结构。
10.一种用于驱动单个或多个放电灯的系统，包括：
主逆变器，驱动所述放电灯的一端；和
从逆变器，驱动所述放电灯的另一端；
其中所述从逆变器的输出电压与所述主逆变器的输出电压异相，并且将所述主逆变器与所述从逆变器的输出电流独立地调节到实质上相同的电平。
11.根据权利要求10所述的系统，其中所述主逆变器向所述从逆变器发送电流基准信号，所述从逆变器接收所述电流基准信号，并将其灯电流调节成与所述主逆变器的灯电流基本相同；其中所述电流基准信号代表所述主逆变器中的灯电流基准信号。
12.根据权利要求11所述的系统，其中所述电流基准信号是脉冲宽度调制PWM信号或DC电压信号。
13.根据权利要求10所述的系统，其中当所述主逆变器或所述从逆变器中发生故障时，同时关断所述主逆变器和所述从逆变器。
14.根据权利要求10所述的系统，其中所述主逆变器向所述从逆变器发送相位信号，所述从逆变器接收所述相位信号，并将其电压输出调节成与所述主逆变器的电压输出实质上成180度的异相关系；其中所述相位信号代表所述主逆变器的开关频率和相位信息。
15.根据权利要求14所述的系统，其中只有在所述主逆变器和所述从逆变器中的开关频率实质上同步并且成180度的异相关系时，才同时开启所述主逆变器和所述从逆变器。
16.根据权利要求10所述的系统，其中所述主逆变器和所述从逆变器是全桥结构。
17.根据权利要求10所述的方法，其中所述主逆变器和所述从逆变器是半桥结构。
18.根据权利要求10所述的方法，其中所述主逆变器和所述从逆变器是推挽式结构。
CNA2007100917843A 2006-04-11 2007-04-11 驱动大型lcd显示屏背光设备的逆变器 Pending CN101082714A (zh)

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