CN1953631A - 一种适合冷阴极荧光灯背光应用的直流/交流电源装置 - Google Patents

一种适合冷阴极荧光灯背光应用的直流/交流电源装置 Download PDF

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CN1953631A
CN1953631A CNA200510114121XA CN200510114121A CN1953631A CN 1953631 A CN1953631 A CN 1953631A CN A200510114121X A CNA200510114121X A CN A200510114121XA CN 200510114121 A CN200510114121 A CN 200510114121A CN 1953631 A CN1953631 A CN 1953631A
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voltage
inverter
power device
piezoelectric transformer
current
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董晓鹏
张军明
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AMERICAN MONOLITHIC POWER Inc
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AMERICAN MONOLITHIC POWER Inc
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Priority to CNA200510114121XA priority Critical patent/CN1953631A/zh
Priority to US11/582,916 priority patent/US7825605B2/en
Publication of CN1953631A publication Critical patent/CN1953631A/zh
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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
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

本发明涉及一种直流/交流电源变换装置，适合用作冷阴极荧光灯(CCFL)背光电源，其特征是输入包括一个直流/直流转换装置，一个全桥结构或者半桥结构的逆变器，通过一个压电变压器输出交流。前级的直流/直流转换装置实现预稳压功能，可以在很宽的输入电压范围内保证系统的高效率。

Description

一种适合冷阴极荧光灯背光应用的直流/交流电源装置
技术领域
本发明涉及一种直流/交流电源变换装置。
背景技术
本直流/交流电源变换装置主要针对冷阴极荧光灯(CCFL)应用场合，包括一个前级直流/直流转换、一个逆变器以及一个压电变压器。CCFL作为平板显示器的背光，目前被广泛应用。CCFL需要一个交流高压来启动，这个电压一般是正常工作电压的3倍左右。当CCFL正常工作时，其工作电压一般是交流300-600V(有效值)。
由于便携式设备，如笔记本电脑等，一般由直流/电池供电，需要一个专门的直流/交流电源变换装置作为背光电源给CCFL供电。由于电池充放电的关系，其直流输入电压的范围很宽，如9V-20V、5V-12V等。同样由于电池供电的关系，背光电源作为较大的功率消耗设备，效率的高低直接影响电池使用时间和系统成本。而且随着便携式设备的轻、薄方向的发展，对体积的要求也非常严格。因此这个直流/交流电源变换装置必须适合宽输入电压范围、高效率以及小尺寸。
目前传统的CCFL背光电源采用传统的磁变压器，在EMI干扰和耐压等方面需要特别注意，而且，限制了尺寸和高度的进一步缩小，在轻、薄方向发展会存在一定的限制。新型的压电变压器由于采用压电转换技术，在EMI和耐压方面相对传统的磁变压器有明显的优势，而且其尺寸和高度相对传统磁变压器更小，适合更小体积的应用。压电变压器目前在CCFL背光电源的应用范围正在逐步扩大。
在压电变压器本身的谐振点附近，可以得到很高的升压比和很高的转换效率，如图1所示。但是在偏离谐振点时，其升压比下降，效率也会同时下降。目前的采用压电变压器的背光电源为了适应宽输入电压的需要，同时为了获得恒定的工作电流，一般采用调节开关频率的方法来调节输出，在输入电压上升的时候，开关频率升高，压电变压器的升压比下降，从而稳定输出，如从图1所示的工作点A转变到图1所示的工作点B。因此，在整个宽输入电压范围内，不能获得高的效率。一般随着电压的升高，其转换效率随着下降。输入电压范围越宽，效率变化越大。
发明内容
鉴于上述，本发明的目的是提供一种结构简单，在宽输入电压范围条件下，提高采用压电变压器的CCFL背光电源效率的直流/交流变换装置。
本发明的直流/交流变换装置包括一个前级的直流/直流转换装置[A]，一个逆变器[B]、一个压电变压器[PT]和一个输入电感，其特征是通过前级的直流/直流转换装置来稳定逆变器的输入电压，实现宽的输入电压范围，
附图说明
图1是现有的压电变压器在主谐振点附近的典型电压增益与频率关系图。
图2是本发明一实施例的直流/交流变换装置的系统框图。
图3A是本发明一实施例的直流/直流转换装置[A]的升降压型电路图。
图3B是本发明一实施例的直流/直流转换装置[A]的降压型电路图。
图3C是本发明一实施例的直流/直流转换装置[A]的升压型电路图。
图4A是本发明一实施例的逆变器[B]的全桥结构图。
图4B是本发明一实施例的逆变器[B]的半桥结构图。
图4C是本发明一实施例的逆变器[B]的串电容的半桥结构图。
具体实施方式
以下结合附图对本发明做详细的描述：
参照图2，本发明的前级直流/直流转换装置[A]可以是一个降压型的(BUCK)电路，或者是一个升压型(BOOST)电路，或者是一个升降压型的(BUCK-BOOST)电路，如图3A至3C所示。图中所示的开关管可以是MOS管、三极管或者其他任何开关器件。前级的直流/直流转换装置[A]输入接系统的直流输入，其输入变化范围可以很宽。其输出电压通过内部的反馈控制，被稳定在一个电压值，或者稳定在一个合理的、相对较小的电压范围内。
逆变器[B]的输入电源就是前级直流/直流转换装置的输出电压。逆变器的输出通过一个电感接到压变压器[PT]的两端，压电变压器的输出直接驱动负载。图4A至4C是逆变器[B]的三种结构，一种是全桥结构，一种是传统半桥结构，一种是串电容的半桥结构。
通过前级直流/直流转换装置的稳压功能，很宽的输入电压范围被稳定在一个电压值(或者是一个较小的范围)，后级的逆变器的转换效率得到提高。同时，采用前级的直流/直流转换装置，在要求的效率下可以进一步扩大输入电压的范围，可以扩大单一压电变压器品种的应用范围，进一步降低系统的成本。
综上可见，本发明通过加入一个前级的直流/直流转换装置，可以提高在宽输入电压变化范围下，采用压电变压器的CCFL背光电源的转换效率。同时可以进一步扩大单一压电变压器品种的应用范围，适合标准化和大规模生产，有助于进一步降低成本，与现有单级的技术相比有明显的优点。

Claims (7)

1.一种适合冷阴极荧光灯背光应用的直流/交流电源装置，包括一个直流/直流转换器[A]、逆变器[B]和一个压电变压器[PT]，其特征是：
直流/直流转换器[A]将宽范围变化的输入电压转换为一相对稳定的电压，该稳定电压再与逆变器[B]的输入端连接；
逆变器[B]将输入直流电压变换为脉冲电压；
压电变压器[PT]与一个电感串联后接到逆变器的输出端。
2.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的直流/直流转换器[A]是一个降压型，升压型或升降压型的直流/直流转换装置，其功能为将宽范围变化的直流电压转换为相对稳定的直流电压。
3.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的直流/直流转换器[A]的输出电压为一稳定电压或一窄范围变化的直流电压。
4.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的逆变器[B]是全桥或半桥拓扑结构，其功能是将直流电压转换为交流脉冲电压信号。
5.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的逆变器[B]使用宽范围调制的控制方式或使用定占空比的控制方式。
6.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的逆变器[B]使用的调制频率可以进行微调，并可以自动跟踪压电变压器[PT]的最优工作频率。
7.按照权利要求1所述的直流/交流电源装置，其特征在于，所述的压电变压器[PT]为对称结构或非对称结构。
CNA200510114121XA 2005-10-17 2005-10-17 一种适合冷阴极荧光灯背光应用的直流/交流电源装置 Pending CN1953631A (zh)

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US11/582,916 US7825605B2 (en) 2005-10-17 2006-10-17 DA/AC convert for driving cold cathode fluorescent lamp

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