CN1209940A - 电路装置 - Google Patents

电路装置 Download PDF

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Publication number
CN1209940A
CN1209940A CN97191965.8A CN97191965A CN1209940A CN 1209940 A CN1209940 A CN 1209940A CN 97191965 A CN97191965 A CN 97191965A CN 1209940 A CN1209940 A CN 1209940A
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CN
China
Prior art keywords
lamp
circuit arrangement
discharge lamp
circuit
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN97191965.8A
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English (en)
Inventor
R·波拉斯
A·希尔格尔斯
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of CN1209940A publication Critical patent/CN1209940A/zh
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • H05B41/2821—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 single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822—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 single-switch converter or a parallel push-pull 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
    • H05B41/36—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
    • 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
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/02—High frequency starting operation for fluorescent lamp
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/05—Starting and operating circuit for fluorescent lamp

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

一种用于操作放电灯的电路装置,包括一个用于产生高频输入电压的振荡器(OSC);一个压电变换器(PT),具有与振荡器相连的输入端(I1,I2)和输出端(01,02)一个与压电变换器相连的负载电路(C,K1,K2),它包括和灯连接的端子,根据本发明的负载电路包括一个可调电容器(C)。该可调电容器形成一个非常简单的装置用于在一个大范围内控制放电灯的光输出。

Description

电路装置
本发明涉及一种用于操作放电灯的电路装置，包括：一个产生高频输入电压的振荡器；一个压电变换器，具有一个和振荡器相连的输入端并具有输出端；一个与压电变换器相连的负载电路，它包括和灯连接的端子。
本发明还涉及包括这样一个电路的液晶显示器。
这种电路由EP0706306 A2已知。已知的电路非常适合用于操作低压型水银放电灯，这种灯用于作为液晶显示器的背光。这种低压水银放电灯具有比较高的点燃电压和比较高的工作电压。一个和压电变换器相结合的电路的重要优点是在点燃和稳定工作期间，高频输入电压的频率可以保持在一个相同的值。这可以带来一个优点就是电路的结构可以相当简单。另一个优点是由于压电变换器一般较小，电路也就较小。已知电路的缺点是为了使灯变暗，它需要包括相对复杂的变暗电路。该相对复杂的变暗电路使整个电路装置昂贵和笨重。
本发明的目的是提供一个电路装置，其中的变暗电路相对简单，从而电路装置相对便宜并且体积相对较小的同时，灯可以在较宽范围内变暗。
在开头部分所述的根据本发明的电路，其特征在于负载电路包括一个可调节电容器。
这样有可能通过在小范围内调节可调电容的电容量，有效地影响电路装置提供给放电灯的功率值。以这种方式，可以使用一个简单的装置使放电灯在宽的范围内有效变暗。根据本发明的电路装置的另一个优点是可调电容器可以补偿在灯和/或用于灯连接的线路及端子中寄生电容产生的影响。已经发现，在相同电路装置的实施例之间存在的寄生电容稍有不同会引起在相同工作情况下，相同灯的输出光的显著不同。通过调节可调电容器的电容，这种效果可以被补偿。另一个优点是电路的效率可以通过调节电容器的电容量而有效地控制。
最好是，可调电容器连接到压电变换器的输出端。可以看出，当电路这样构成时，可调电容器用来在较大范围内使灯变暗。
采用Rosen型压电变换器的电路装置可以获得许多良好的效果。
根据本发明的电路装置的变暗装置完全满足低压水银放电灯的情况。特别是对于在液晶显示器中作为背光的低压水银放电灯更是如此。根据本发明的电路装置体积小，相对便宜并且包括灯的光输出调节装置，从而非常适合用于液晶显示器。
现在将参考附图描述本发明的一个实施例。
图1是根据本发明的连接有一个放电灯的电路装置的一个实施例的示意图；
图2表示在与放电灯并联的电容作用下，由图1所示电路向放电灯传送功率的量；
图3表示在与放电灯并联的电容作用下，表示图1电路装置的效率。
图1中的T1和T2是用于连接于电源的端子。T1和T2连接于振荡器OSC的相应输入端，以产生高频输入电压。压电变换器的输入端I1和I2连接到振荡器OSC的相应输出端。通过可调电容器C和放电灯La使输出端01和02连接。K1和K2是电灯连接端。可调电容器C和端子K1和K2一起形成负载电路。
图1所示的实施例的工作情况如下：
在端子T1和T2连接到电源的端子上时，振荡器OSC产生一个具有基本上恒定的高频输入电压，该恒定频率从压电变换器PT的第一谐振频率附近选择。高频输入电压出现在压电变换器的输入端I1和I2之间并且由压电变换器变换到相同频率的高频输出电压。该高频输出电压出现在输出端O1和O2上，从而出现在放电灯La和可调电容器C上。通过调节可调电容器的电容，调节提供给灯的功率，从而灯的光输出可以被控制。
在图2和图3所示的是由电路装置获得的定性数据，该电路装置包括由菲利普电子有限公司提供的长方形的Rosen型的压电变换器。压电变换器的尺寸为38mm×5mm×2mm并且由材料PXE43构成。由振荡器OSC产生的高频信号是频率为35KHz的正弦波。由该电路装置操作的灯是由菲利普电子公司提供的NDF-M6型低压水银放电灯。
图2表示在与放电灯并联的电容作用下向灯提供相对功率的图。这里相对功率表示功率(P2)除以由振荡器OSC产生的高频输入电压幅值的平方。该相对功率是沿垂直轴以A/V(安培/伏特)为单位表示的。与灯并联的电容器的电容(法拉)的对数沿水平轴表示。可以看出提供给灯的功率受与灯并联的电容影响很大并且在约45PF的值附近出现峰值。
图3表示在与灯并联的电容器的作用下电路装置的效率η以纵轴表示，与灯并联的电容器的电容的对数用横轴表示。可以看出在对应于高的相对功率下的提供给灯的电容器的电容值效率会骤然下降。图2和图3表示出如果在提供给灯的相对高功率的要求和电路装置的合理的效率要求同时满足的话，对于与灯相并联的电容器的选择是很有限的。实际上由于和灯并联的电容器的值由寄生电容和可调电容共同决定，通过调节可调电容的值来补偿寄生电容的影响是非常有益的。

Claims (6)

1．一种用于操作放电灯的电路装置，包括：
一个用于产生高频输入电压的振荡器；
一个压电变换器，具有一个和振荡器相连的输入端并具有输出端；
一个与压电变换器输出端相连的负载电路，它包括和灯连接的端子；
其特征在于，负载电路包括一个可调电容器。
2．根据权利要求1所述的电路装置，其特征在于，高频输入电压频率基本为恒定值。
3．根据权利要求1或2所述的电路装置，其特征在于，可调电容器连接到压电变换器的输出端。
4．根据前面所述的一个或多个权利要求所述的电路装置，其特征在于，压电变换器为Rosen型。
5．根据前面所述的一个或多个权利要求所述的电路装置，其特征在于，放电灯是低压水银放电灯。
6．一种液晶显示装置装有根据前面所述的一个或多个权利要求所述的电路装置。
CN97191965.8A 1996-12-02 1997-11-06 电路装置 Pending CN1209940A (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96203406.2 1996-12-02
EP96203406 1996-12-02

Publications (1)

Publication Number Publication Date
CN1209940A true CN1209940A (zh) 1999-03-03

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CN97191965.8A Pending CN1209940A (zh) 1996-12-02 1997-11-06 电路装置

Country Status (5)

Country Link
US (1) US5910711A (zh)
EP (1) EP0880820A2 (zh)
JP (1) JP2000505237A (zh)
CN (1) CN1209940A (zh)
WO (1) WO1998025441A2 (zh)

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DE69922634T2 (de) * 1998-10-21 2005-12-15 Matsushita Electric Industrial Co., Ltd., Kadoma Schaltung zur steuerung von piezoelektrischen transformatoren
GB9825298D0 (en) 1998-11-18 1999-01-13 Microlights Ltd An electronic ballast
GB9825299D0 (en) * 1998-11-18 1999-01-13 Microlights Ltd Improvements to electrical lamps
GB9825296D0 (en) * 1998-11-18 1999-01-13 Microlights Ltd A improvement to electrical lamps
WO2001014945A1 (en) 1999-08-20 2001-03-01 Texas Instruments Incorporated Control circuit for piezo transformer based fluorescent lamp power supplies
US6639367B2 (en) 2002-02-27 2003-10-28 Texas Instruments Incorporated Control circuit employing preconditioned feedback amplifier for initializing VCO operating frequency
US7336041B2 (en) * 2004-12-06 2008-02-26 Vicente Aldape Ayala Automatic light dimmer for electronic and magnetic ballasts (fluorescent or HID)
US11027235B2 (en) 2015-03-30 2021-06-08 General Electric Technology Gmbh Method and apparatus for reagent recovery in a flue gas processing system

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US3691410A (en) * 1969-09-29 1972-09-12 Denki Onkyo Co Ltd Method of operating piezoelectric transformers
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JP2778554B2 (ja) * 1995-10-12 1998-07-23 日本電気株式会社 圧電トランス駆動回路

Also Published As

Publication number Publication date
EP0880820A2 (en) 1998-12-02
WO1998025441A3 (en) 1998-07-23
WO1998025441A2 (en) 1998-06-11
US5910711A (en) 1999-06-08
JP2000505237A (ja) 2000-04-25

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