CN1538793A - 用于lcd屏的电源 - Google Patents

用于lcd屏的电源 Download PDF

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CN1538793A
CN1538793A CNA2003101017800A CN200310101780A CN1538793A CN 1538793 A CN1538793 A CN 1538793A CN A2003101017800 A CNA2003101017800 A CN A2003101017800A CN 200310101780 A CN200310101780 A CN 200310101780A CN 1538793 A CN1538793 A CN 1538793A
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supply system
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CN100342755C (zh
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林永霖
柳达
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O2Micro International Ltd
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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
    • H05B41/26—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
    • H05B41/2827—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 specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
    • 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
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • 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

本发明给出了一种用于多个灯管的LCD屏的电源系统。一方面，该电源系统包括用来驱动多个对应CCFL的多个变压器。每个变压器的初级线圈相互串联，从而减小每个变压器上的电压。对于长CCFL的LCD屏，本发明给出了一种包括用来驱动多个对应CCFL的多个变压器。每个变压器的初级线圈相互串联，并且每个灯管与变压器的两个次级线圈相连，从而减少长CCFL灯管存在的问题。在任意一个实施例中，电源都从一个高电压直流电转换为给灯管供电的高电压交流电。

Description

用于LCD屏的电源
技术领域
本发明涉及一种用于LCD屏显示器的电源，更具体的，涉及一种给LCD屏电视机(LCDTV)的多个冷阴极荧光灯供电的背光电源。
技术背景
图1所示为一种LCD屏的常规电源系统10。在该常规系统中，110V/220V交流电源通过一个整流器电路或功率因素校正电路12转换为一个高直流电压。然后，该高直流电压通过一个直流/直流(DC/DC)转换器14降压后，可以为一些电子设备提供例如5V和12V的低电玉，这些电子设备包括微控制器、存储器、TFT驱动器、图解和冷阴极荧光灯(CCFLs)。逆变器16再把低直流电压转换为一个高交流电压从而给LCD屏18的CCFL供电。直流/直流转换器14和直流/交流逆变器16的多次电压转换会影响转换效率并在系统中产生热量。对于大LCD屏，比如LCD电视中的，大部分的电能都消耗在CCFL上。因此，提高用于CCFL的逆变器的效率就很重要。
图2所示为一种提高逆变器系统效率的常规电路20，其中，高直流电压直接送入直流/交流转换器16′。这减少了直流/直流转换器的中间步骤，从而提高了总效率。
如图3、图3A和图4所示，一个高直流电压转换为一个交流信号需要一个低匝数比的变压器接到CCFL。图3所示为一种逆变器电路，该逆变器电路建立在一个半桥式电路(两个开关)上，并且包括一个逆变器控制器32，该逆变器控制器驱动开关34和36给变压器38提供必需的电压。逆变器控制器32和半桥式电路都是本领域所公知的。图3A所示为一种Class D式逆变器电路，图4所示为一种全桥式(四个开关)逆变器电路，它们都是本领域所公知的。图4所示电路还示出了反馈线路，这在本论述中不重要。因为变压器的尺寸是根据CCFL的应用情况来选择的，驱动CCFL的次级线圈通常是由负载需求确定的。然而，在高电压输入的情况下，初级线圈的线圈匝数比5V到10V的低电压输入驱动的变压器的线圈匝数大很多，这就增加了变压器的复杂度和成本。
发明内容
一方面，本发明给出了一种用于LCD屏的电源系统，包括：
一个能控制多个开关，从而把一个直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收高电压交流信号的变压器，并且上述每个变压器都产生一个高电压正弦信号，每个变压器都有一个初级线圈和至少一个次级线圈，每个初级线圈相互串联且都流过同一高电压交流信号；和
一个包括多个冷阴极荧光灯管的LCD屏，每个灯管都由一个对应的上述变压器的次级线圈供电。
另一方面，本发明给出了一种用于LCD屏的电源系统，包括：
一个能控制多个开关，从而把一个直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收高电压交流信号的变压器，并且上述每个变压器都产生一个高电压正弦信号，其中每个变压器都有一个初级线圈和至少一个次级线圈，每个初级线圈相互串联且都流过同一高电压交流信号；和
一个包括多数冷阴极荧光灯管的LCD屏，每个灯管都由至少两个对应的上述变压器的次级线圈供电。
这里给出的任何实施例中，电源都可以从一个高直流电压信号转换为一个用来给灯管供电的高交流电压。
值得本领域的技术人员重视的是，虽然下面的详细描述是基于给出的最佳实施例，但是本发明并不仅仅局限于这些实施例。反而，本发明涉及范围广泛，其范围仅由相应权利要求限定。
本发明的其他特征和优点将在下面的详细描述过程中得到充分体现，详细描述中请参照附图及其相关数据、元件标号。
附图说明
图1所示为一种用于LCD屏的常规电源系统框图；
图2所示为另一种用于LCD屏的常规电源系统框图；
图3所示为一种用于LCD屏的常规逆变器电路框图；
图3A所示为另一种用于LCD屏的常规逆变器电路框图；
图4所示为另一种用于LCD屏的常规逆变器电路框图；
图5所示为本发明的用于LCD屏的逆变器电路的一个典型实施例；
图5A所示为本发明的用于LCD屏的逆变器电路的另一个典型实施例；
图6所示为本发明的逆变器电路中的变压器和LCD屏的一种电路框图；
图7所示为本发明的逆变器电路的中变压器和LCD屏的另一种电路框图；
图8所示为本发明的LCD电源系统的详细电路图；
图9所示为本发明的逆变器电路中的变压器和LCD屏的又一种电路框图；和
图10所示为另一种每个CCFL都用两个控制器和两个逆变器电路驱动的驱动电路。
具体实施例
LCD屏电视中通常都采用多个CCFL来给LCD屏提供充足亮度，例如，根据LCD屏的尺寸大小而定的4至32个CCFL。一方面，本发明在电源转换过程中，变压器的初级线圈是相互串联的。
图5所示为本发明的一个用于LCD屏的逆变器电路50的典型实施例。在该典型实施例中，变压器T1和T2的初级线圈串联在一起。因此，每个初级线圈上的线圈电压为跨在整个线圈上的输入电压(VAB)的一半。与图4的变压器初级线圈相比，该方法能使线圈匝数减少为原来的一半。在图5所示的半桥式电路中，把变压器的初级线圈相串联，这使得每个线圈上的电压减小为输入电压的四分之一。当采用半桥式电路时，每个线圈上的电压为输入电压的1/2N(其中N为串联的变压器的个数)。当然，图4所示电路中也可以改用一个全桥式电路，此时，当N个变压器的初级线圈相串联时，每个初级线圈上的电压减小为输入电压的1/N。图5A所示为一个Class D逆变器电路，因为变压器的初级线圈也是相串联的，所以它与上述图5所示的电路具有相同的优点。
图6所示为本发明逆变器电路中的变压器和LCD屏的电路框图52。在该图中，上述原理扩展为：在图5所示的A点和B点之间，用四个初级线圈T1、T2、T3、和T4相串联，来给四个CCFL灯管供电。同样，该电路可以扩展为图7所示，用N个变压器给N个CCFL灯管供电。
因为每个初级线圈相串联，在开关电路(例如，半桥式、全桥式或Class D式的开关电路)闭合、断开期间，流经每个变压器初级线圈的电流是相同的。图5、6和7中，开关电路连在A点和B点之间。这种结构进一步改善了每个驱动CCFL的变压器次级线圈的电流平衡。
图8所示为本发明的一种典型LCD电源系统100的详细电流框图。该电源包括一个驱动半桥式电路中的两个开关54和56的逆变器控制器52，如上述图5所示。该逆变器控制器52包括用来控制连在电路上CCFL供电状况的电压和电流反馈。根据上述的原理和描述，每个CCFL由如图所示的串联的一个初级线圈变压器供电(例如，T1，T2...T(n-1)，Tn，Tx；其中n代表偶数个灯管，x代表奇数个灯管)。
电流反馈是由图示电路中的灯管1和2导出的反馈电路60产生的。该典型电流反馈电路60包括一个光耦合器和一个调节器64。调节器放大电流反馈信号CFB，光耦合器62再把反馈信号传送给控制器52。同样，电压反馈信息也是由电压反馈电路70产生的。该典型实施例中，从电路中每个灯管采集的电压反馈信息产生一个电压反馈信号VB。
图8所示的详细电路中还包括其它与本发明不直接相关的电路。例如，一个脉宽调制PWM控制器58产生直流电源信号(例如，12V和5V)给其它与LCD显示器相连的元件(例如储存器、微控制器等)供电。同样，如上所述，功率因数校正PFC模块12可以采用任何传统和/或常规电路来产生一个高直流电压。
另一方面，本发明给出了一种驱动长CCFL灯管的电路。LCD电视中采用的CCFL灯管的尺寸通常比便携式设备中的LCD显示器的CCFL灯管长。而驱动长CCFL变得更困难。例如，如图3、3A和4所示，驱动任何长约60厘米以上的灯管的常规方法需要在CCFL上加一个高频的高电压(通常在1000伏有效值左右)，此时CCFL的一侧电位接近于底盘地。由于CCFL和底盘之间存在泄流路径，这些驱动方法通常会使CCFL灯管的一侧变黑。长灯管约为75至80cm或更长，并且长灯管通常意味着有一个泄漏电容，从而影响灯管电极之间的电子漂移。
为了解决该问题，本发明给出了一种不同的驱动技术。如图9所示，一根长灯管可以由两个相位极性相反的变压器驱动。图9中，CCFL1由T1次级线圈的正极和T2次级线圈的负极驱动(正负极是由变压器产生的正弦电源信号的半个周期表示的)。实际上，CCFL1的中心为近似零电势。例如，每个变压器输出500伏有效值时，其电压和机械空间就安全要求范围而言就会减小很多。
另一方面，上述驱动技术也可以改进为如图10所示。图10所示为一种用两个控制器202和204与两个逆变器电路206和208来驱动一个CCFL的驱动电路200。两个逆变器电路通过一个同步信号210彼此相连，因此控制器控制各自的逆变器电路，从而产生如图所示近似180度相位差的近似正弦信号。这确保灯管能在每半个周期接收到来自每个逆变器的全部电压，而不存在电源信号抵消。当然，该电路还可以包括电压和/或电流反馈来控制灯管的供电状况。
本发明的逆变器控制器可以是包括用来调节传送至灯管功率的减光电路(例如，脉冲模式、模拟式和/或相位式)的常规逆变器控制器。能控制半桥式、全桥式、Class D式和/或其它逆变器电路的逆变器控制器都是本领域所公知，并且都与本发明等同。例如，在此引作参考的美国专利No.6,259,615和No.5,615,093都分别披露了用于全桥式和半桥式逆变器电路的逆变器控制器。逆变器控制器还可以采用由02Micro国际有限公司生产的，例如No.OZ960、OZ961、OZ965、OZ970、OZ971、OZ972或OZ9RR。
另外，对于本领域技术人员显而易见的是，如图所示的LCD屏包括能产生一个表示灯管负载上电压和/或电流情况的电压和/或电流反馈信号的电路。在此所述的逆变器控制器还能接收该反馈信息从而调整供给灯管负载上的电压和/或电流。在典型实施例中，电流反馈可以是：图5和5A中的两个灯管中的一个产生的，或者图6、7和8中的N个灯管中的两个灯管产生。图9中，电流反馈控制信号是由没与灯管相连的变压器次级线圈部分产生的。在该情况下，流至灯管电流的每半个周期都得到监控。同样，电压反馈控制信号可以由本领域熟知的方法产生。
在典型实施例中，通过逆变器控制器的控制使得变压器和电源相连。该逆变器控制器把一个高电压直流信号源转换为一个高电压交流信号(方波)。接着，变压器把高电压交流信号转换为高电压正弦电源给灯管供电。当然，本发明也可以用一个低电压直流电源，此时变压器将把电压提高到一个适当的电压来驱动灯管。本领域的技术人员将知道许多对本发明的改进，所有的这些改进都认为是在本发明的精神之内，都受限于本发明的权利要求。

Claims (29)

1.一种高电压LCD电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个高电压直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收所述高电压交流信号的变压器，并且每个所述变压器都产生一个高电压正弦信号，所述每个变压器都有一个初级线圈和一个次级线圈，所述每个初级线圈相互串联且都流过同一高电压交流信号；和
一个包括多个冷阴极荧光灯管的LCD屏，每个所述灯管都由一个对应的所述变压器的次级线圈供电。
2.根据权利要求1所述的电源系统，其特征在于：所述开关按全桥式电路结构排列，所述逆变器控制器能控制所述全桥式电路。
3.根据权利要求1所述的电源系统，其特征在于：所述开关按半桥式电路结构排列，所述逆变器控制器能控制所述半桥式电路。
4.根据权利要求1所述的电源系统，其特征在于：所述开关按Class-D式电路结构排列，并且所述逆变器控制器能控制所述Class-D式电路。
5.根据权利要求1所述的电源系统，其特征在于：还包括产生一个表示供给至少一个所述灯管的电流的电流反馈信号电路，并且所述逆变器控制器接收所述电流反馈信号从而调整传输给至少一个灯管的电流。
6.根据权利要求1所述的电源系统，其特征在于：还包括产生一个表示供给至少一个所述灯管的电压的电压反馈信号电路，并且所述逆变器控制器接收所述电压反馈信号从而调整传输给至少一个灯管的电压。
7.一种高电压LCD电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个高电压直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收所述高电压交流信号的变压器，并且每个所述变压器都产生一个高电压正弦信号，所述每个变压器都有一个初级线圈和一个次级线圈，所述每个初级线圈相互串联且都流过同一高电压交流信号；
一个包括多个冷阴极荧光灯管的LCD屏，每个所述灯管都由所述变压器的至少两个对应次级线圈供电。
8.根据权利要求7所述的电源系统，其特征在于：所述灯管连接在一个第一次级线圈正极和一个第二次级线圈负极之间。
9.根据权利要求7所述的电源系统，其特征在于：所述开关按全桥式电路结构排列，所述逆变器控制器能控制所述全桥式电路。
10.根据权利要求7所述的电源系统，其特征在于：所述开关按半桥式电路结构排列，所述逆变器控制器能控制所述半桥式电路。
11.根据权利要求7所述的电源系统，其特征在于：所述开关按Class-D式电路结构排列，所述逆变器控制器能控制所述Class-D式电路。
12.根据权利要求7所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电流的电流反馈信号电路，并且所述逆变器控制器接收所述电流反馈信号从而调整传输给至少一个灯管的电流。
13.根据权利要求7所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电压的电压反馈信号电路，并且所述逆变器控制器接收所述电压反馈信号从而调整传输给至少一个灯管的电压。
14.一种用于LCD屏的电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收所述高电压交流信号的变压器，并且每个所述变压器都产生一个高电压正弦信号，其中每个所述变压器都有一个初级线圈和一个次级线圈，所述每个初级线圈相互串联且都流过同一高电压交流信号；
一个包括多个冷阴极荧光灯管的LCD屏，所述灯管由所述变压器的次级线圈供电。
15.一种高电压LCD电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个直流信号转换为一个高电压交流信号的逆变器控制器；
多个接收所述高电压交流信号的变压器，并且每所述个变压器都产生一个高电压正弦信号，其中每个所述变压器都有一个初级线圈和一个次级线圈，所述每个初级线圈相互串联且都流过同一高电压交流信号；
一个包括多个冷阴极荧光灯管的LCD屏，每个所述灯管都由所述变压器至少两个对应的次级线圈供电。
16.根据权利要求15所述的电源系统，其特征在于：所述灯管连接在一个第一次级线圈正极和一个第二次级线圈负极之间。
17.一种高电压LCD电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个直流信号转换为一个交流信号的逆变器控制器；
多个变压器次级线圈，每个所述次级线圈由所述交流信号产生一个高电压正弦信号；和
一个包括多个冷阴极荧光灯管的LCD屏，每个所述灯管都由一个对应的所述变压器的次级线圈供电。
18.根据权利要求17所述的电源系统，其特征在于：所述开关按全桥式电路结构排列，所述逆变器控制器能控制所述全桥式电路。
19.根据权利要求17所述的电源系统，其特征在于：所述开关按半桥式电路结构排列，所述逆变器控制器能控制所述半桥式电路。
20.根据权利要求17所述的电源系统，其特征在于：所述开关按Class-D式电路结构排列，并且所述逆变器控制器能控制所述Class-D式电路。
21.根据权利要求17所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电流的电流反馈信号电路，并且所述逆变器控制器接收所述电流反馈信号从而调整传输给至少一个灯管的电流。
22.根据权利要求17所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电压的电压反馈信号电路，并且所述逆变器控制器接收所述电压反馈信号从而调整传输给至少一个灯管的电压。
23.一种高电压LCD电源系统，其特征在于：所述电源系统包括：
一个能控制多个开关，从而把一个直流信号转换为一个交流信号的逆变器控制器；
多个变压器次级线圈，每个所述次级线圈由所述交流信号产生一个高电压正弦信号；和
一个包括多个冷阴极荧光灯管的LCD屏，每个所述灯管都由所述变压器的至少两个对应次级线圈供电。
24.根据权利要求23所述的电源系统，其特征在于：所述灯管连接在一个第一次级线圈正极和一个第二次级线圈负极之间。
25.根据权利要求23所述的电源系统，其特征在于：所述开关按全桥式电路结构排列，所述逆变器控制器能控制所述全桥式电路。
26.根据权利要求23所述的电源系统，其特征在于：所述开关按半桥式电路结构排列，所述逆变器控制器能控制所述半桥式电路。
27.根据权利要求23所述的电源系统，其特征在于：所述开关按Class-D式电路结构排列，所述逆变器控制器能控制所述Class-D式电路。
28.根据权利要求23所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电流的电流反馈信号电路，并且所述逆变器控制器接收所述电流反馈信号从而调整传输给至少一个灯管的电流。
29.根据权利要求23所述的电源系统，其特征在于：所述电源系统还包括产生一个表示供给至少一个所述灯管的电压的电压反馈信号电路，并且所述逆变器控制器接收所述电压反馈信号从而调整传输给至少一个灯管的电压。
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US7075245B2 (en) 2006-07-11
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US7425949B2 (en) 2008-09-16
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US7550928B2 (en) 2009-06-23
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US20060202635A1 (en) 2006-09-14
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TW200426749A (en) 2004-12-01
US8179053B2 (en) 2012-05-15

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