WO2011003265A1 - 一种控制气体放电灯输出功率的方法及电子镇流器 - Google Patents

一种控制气体放电灯输出功率的方法及电子镇流器 Download PDF

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Publication number
WO2011003265A1
WO2011003265A1 PCT/CN2010/000338 CN2010000338W WO2011003265A1 WO 2011003265 A1 WO2011003265 A1 WO 2011003265A1 CN 2010000338 W CN2010000338 W CN 2010000338W WO 2011003265 A1 WO2011003265 A1 WO 2011003265A1
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Prior art keywords
gas discharge
discharge lamp
change
light decay
actual power
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PCT/CN2010/000338
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English (en)
French (fr)
Inventor
胡军
Original Assignee
Hu Jun
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Publication date
Application filed by Hu Jun filed Critical Hu Jun
Priority to EP10796642.6A priority Critical patent/EP2544513B1/en
Publication of WO2011003265A1 publication Critical patent/WO2011003265A1/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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting
    • 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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • 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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • 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

Definitions

  • the present invention relates to the field of illumination, and more particularly to a method of controlling the output power of a gas discharge lamp and an electronic ballast. Background technique
  • a gas discharge lamp is an electric light source that converts electrical energy into light by gas discharge.
  • gas discharge lamps There are many types of gas discharge lamps, and more are used: electric and arc discharge.
  • Huiguang is generally used for neon lights.
  • the arc discharge has a strong light output, and the illumination source uses an arc discharge.
  • Fluorescent lamps, energy-saving lamps, high-pressure mercury lamps, high-pressure sodium lamps, metal halide lamps, and xenon lamps are the most widely used lighting gas discharge lamps.
  • the gas discharge lamp has the following characteristics: 1
  • the radiation language is selective. By selecting an appropriate luminescent material, the radiation pupil can be concentrated at the desired wavelength, or several luminescent materials can be used simultaneously to obtain the best combined spectrum. 2 with high efficiency, they can convert 25 ⁇ 30% of input energy into light output. 3 Long life.
  • the service life is up to 10,000 hours or more than 20,000 hours. 4
  • the light output maintains good characteristics and can provide 60 ⁇ 80% of initial light output at the end of life.
  • Gas discharge lamps are used in a wide range of applications in industry, agriculture, medical and scientific research. In addition to being used as an illumination source, in photography, projection, photo printing, photocopying, lithography, chemical synthesis, plastic and rubber aging, fluorescence microscopy, optical oscilloscope, fluorescence analysis, UV detection, sterilization, medical, biological cultivation, solids Lasers and other aspects have a wide range of applications.
  • All kinds of gas discharge lamps are composed of a bulb, an electrode and a discharge gas, and the basic structure is similar.
  • a vacuum gas seal is connected between the bulb and the electrode, and the bulb is filled with a discharge gas.
  • the gas discharge lamp cannot be separately connected to the circuit, and must be connected to the circuit with an auxiliary device such as a trigger or a ballast to start and stabilize the operation.
  • the discharge of a discharge lamp typically applies a higher voltage than the supply voltage, sometimes up to several thousand volts or tens of thousands of volts.
  • Arc discharges generally have a negative volt-ampere characteristic, i.e., the voltage decreases with increasing current.
  • FIG. 1 shows a schematic diagram of a conventional gas discharge lamp with an electronic ballast, including: electromagnetic compatibility (EMI) filter, full bridge rectifier, power factor corrector (APFC), single chip microcomputer, half bridge inverter And some circuits such as fault detection, where: EMI filter is used to prevent the noise generated by the ballast from being transmitted back to the power line, full-bridge rectifier is used to convert the AC power to DC power, and the power factor corrector APFC circuit controls the AC input current and voltage. , produces a regulated DC bus voltage.
  • EMI electromagnetic compatibility
  • APFC power factor corrector
  • the single-chip microcomputer realizes the frequency modulation control to realize the functions of ignition, power control and fault detection of the gas discharge lamp.
  • the ignition trigger voltage on the electrode of the gas discharge lamp is controlled by the half-bridge inverter and the LC resonance circuit, and is more precisely controlled.
  • the pulse width modulation signal of the half bridge inverter can better control the light decay. Therefore, better control of the lamp current can also achieve control of the output power.
  • the PWM module in the microcontroller can provide higher or more accurate resolution, and has better linear frequency control, especially in the range of 30kHz ⁇ 120kHz. Inside. This ensures that sufficient pulse voltage is provided at the start-up to illuminate the gas discharge lamp while providing a stable operating current at steady state.
  • the frequency jitter technology By controlling the frequency jitter technology through programming software, a finer frequency stepping amplitude can be realized, the frequency resolution can be improved, the dynamic frequency jitter can be controlled to control the output power based on the lamp current, and the light attenuation of the light source can be controlled by using the tube voltage as a reference. Achieve the goal of automatic dimming and energy saving.
  • both digital control and analog control dimming electronic ballasts are equipped with ignited gas discharge lamps.
  • the light source is a new light source or a light aging aging light source
  • constant power control technology is used when working, that is, output power and The lamp power rating is consistent.
  • the constant power control principle of the electronic ballast is that the tube current decreases when the tube voltage rises, so that the lamp output
  • the power can always be controlled within the rated range, for example: lamp voltage 100V, lamp current 4A, the output power is 400W, when the tube voltage rises to 120V, the tube current drops to 3.34A, the output power is still 400W Therefore, this working principle is called constant power.
  • the present invention provides a method for controlling the power of a gas discharge lamp and an electronic ballast for power control by reducing the luminous flux caused by gas discharge light decay. Achieve energy savings and extend lamp life.
  • the present invention provides a method for controlling the power of a gas discharge lamp, comprising: detecting a change in a gas discharge light decay;
  • an embodiment of the present invention further provides an electronic ballast, including:
  • a light fading sampling module for detecting a change in a gas discharge light decay
  • a single chip microcomputer configured to determine, according to the light decay variation amount detected by the light decay sampling module, an actual power value corresponding to the matching of the gas discharge lamp;
  • the half bridge inverter is configured to adjust the output power of the gas discharge lamp according to the actual power value matched by the single chip microcomputer.
  • the embodiment of the invention has the following beneficial effects:
  • the electronic ballast can automatically realize the control of the working current and power of the gas discharge lamp, and the gas discharge lamp does not need to work at the rated power when the light decay occurs, thereby saving energy.
  • the invention can also greatly extend the life of the gas discharge lamp on the multi-section ftii.
  • FIG. 1 is a schematic structural view of a conventional gas discharge lamp with a dimming electronic ballast
  • FIG. 3 is a flow chart of a method for controlling the power of a gas discharge lamp in an embodiment of the present invention. detailed description
  • Gas discharge lamps are well received due to their high luminous efficiency, long life and good color rendering.
  • the pollution to the environment due to the use of constant power control methods in the prior art, the more the gas discharge lamp uses less light efficiency and the more power is used.
  • the invention solves the energy waste caused by the premature light decay and aging caused by the working characteristics of the gas discharge lamp and the working environment by developing the high performance digital light decay power control electronic ballast matched with the gas discharge lamp, and the light source is scrapped in advance. Waste of resources and environmental pollution. On the basis of more energy saving, the life of the light source is greatly prolonged, saving resources and reducing environmental pollution.
  • FIG. 2 is a schematic structural view of an electronic ballast gas discharge lamp in an embodiment of the present invention, which includes an electromagnetic compatibility filter, a full bridge rectifier, a power factor power factor corrector, a half bridge inverter, The single chip computer (MCU), the light decay sampling module and the gas discharge lamp, wherein: the light decay sampling module is mainly used for detecting the change of the gas discharge light decay; specifically, the change of the tube voltage according to the detection of the gas discharge lamp; Or detecting the amount of change in the tube current of the gas discharge lamp; or detecting the amount of change in the frequency of the inverter voltage where the gas discharge lamp is located.
  • the light decay sampling module is mainly used for detecting the change of the gas discharge light decay; specifically, the change of the tube voltage according to the detection of the gas discharge lamp; Or detecting the amount of change in the tube current of the gas discharge lamp; or detecting the amount of change in the frequency of the inverter voltage where the gas discharge lamp is located.
  • the single chip microcomputer is mainly used to determine the actual power value corresponding to the output of the gas discharge lamp according to the amount of light decay detected by the light decay sampling module;
  • the microcontroller reduces the output power of the gas discharge lamp according to the detected amount of light decay, according to the output power, the actual power corresponding to the gas discharge lamp matching;
  • the proportional reduction of the output power on the gas discharge lamp can establish a proper proportional relationship according to the change of the light decay, so that the matching actual power coincides with the actual luminous flux corresponding to the gas discharge lamp.
  • the MCU is configured to output the corresponding actual power for the gas discharge lamp in the preset feature library according to the detected amount of light decay, and the preset feature library stores the gas discharge light.
  • the data in the preset feature library may be a series of data acquisition operations performed after sampling according to the characteristics of the gas discharge lamp, for example, in the case of a light decay change, when the gas discharge lamp tube pressure rises by 5 volts or 10 volts, Corresponding actual luminous flux.
  • the half-bridge inverter mainly adjusts the output power on the gas discharge lamp according to the actual power value matched by the microcontroller (MCU).
  • the half bridge inverter can adjust the output to the gas discharge lamp according to the matched actual power value) Input voltage, current, or both voltage and current.
  • the operating frequency of the electronic ballast of gas discharge lamp generally works at high frequency of 30KHZ - 120KHZ.
  • the starting voltage of the lamp peak-to-peak
  • the lamp voltage after stable operation effective Value
  • the sum of the lamp voltage and frequency signals output by the electronic ballast half-bridge high-frequency inverter is extremely unstable.
  • the conventional peak detection circuit or average is used as the lamp working environment and device heating.
  • the value detection circuit and the like have a large error in detecting the effective value of the lamp voltage. Therefore, the design of the acquisition accuracy of the light source light attenuation signal is the focus and difficulty of the present invention.
  • the working state of the gas discharge lamp it is found that when the working environment temperature of the gas discharge lamp is higher than 100 degrees (refer to the high pressure gas discharge lamp), the light decay occurs when the working temperature is higher than 80 degrees (refer to the low pressure gas discharge lamp). Phenomenon, when the light decay phenomenon occurs, the tube voltage and the tube current will change, and the voltage rises the tube current, which leads to the decrease of the light effect.
  • the cause of the premature fading of the light source is spring: 1.
  • the working environment temperature rises, 2 the electrode emission capacity is reduced, 3, long-term super power work.
  • the characteristics of the gas discharge lamp are detected to detect the change of the tube voltage and the tube current during the light decay to control the output power of the gas discharge lamp, so as to achieve the output power corresponding to the luminous flux of the light source when the light source is fading. In order to achieve energy saving and extend the life of the light source.
  • the tube voltage outputted by the half bridge inverter will increase accordingly, the tube current will decrease, and the brightness will be correspondingly reduced, so the gas is discharged through the light decay sampling module.
  • the light decay signal on the lamp is sampled.
  • the light decay sampling module When the tube voltage of the gas discharge lamp changes (the range of variation is 110V-160V for high pressure gas discharge lamp, 160V-200V for low pressure gas discharge lamp), the light decay sampling module will collect the collected The tube voltage is input to the measurement IC, and the measurement IC converts the disordered lamp light decay voltage signal into a corresponding RMS DC voltage and outputs it, and is amplified by two inverse proportional amplifiers and input to an analog-to-digital converter of the MCU (MCU).
  • MCU analog-to-digital converter of the MCU
  • the single-chip/ ⁇ -collected light-fading DC voltage is compared with the programmable analog comparator module in the microcontroller (programmable comparator reference tube voltage, as illustrated by 110V) According to the result of the comparison, the frequency of controlling the half bridge drive is changed correspondingly, thereby changing the power of the lamp.
  • the appropriate control tube current decreases for example: When the tube pressure rises by 10V, the power is automatically Drop 5W-20W (control high pressure gas Discharge lamp), when the tube pressure rises to 160V, the power drops by 30-120W. If the tube voltage continues to rise above 160V, the protection circuit will start to turn off the half-bridge inverter output. Or whenever the tube pressure rises 50-10V power drops 1-2W (control low-pressure gas discharge lamp). In this way, the automatic closed-loop control of the power of the light decay power can be achieved when the light source drops proportionally after the light source begins to decay.
  • the control of the output power of the gas discharge lamp can also be realized by detecting the current change on the gas discharge lamp and the frequency change of the inverter voltage under the condition of light failure.
  • the amount of change here does not require power adjustment of the gas discharge lamp when the light decays to a certain extent, and the power supply of the gas discharge lamp is stopped, so that the gas discharge lamp is already in the 4th waste. State, which does not properly provide illumination to the user.
  • the proportionally decreasing output power of the gas discharge lamp on the gas discharge lamp is proportionally reduced according to the detected amount of light decay, so that a proper proportional relationship can be established according to the change of the light decay, so that The matched actual output power is not much different from the actual emitted luminous flux corresponding to the gas discharge lamp.
  • the preset feature library stores a gas discharge light decay variation amount and The actual power value corresponding to the gas discharge lamp corresponding to the amount of change in light decay.
  • the pre-set operation for example, in the case of a change in light decay, the actual emitted luminous flux corresponding to the corresponding gas discharge lamp when the gas discharge lamp tube rises by 5 volts or 10 volts.
  • the life of the gas discharge lamp is too high in the working environment and the tube pressure will gradually increase in the later stage.
  • the inductive ballast circuit the inductive ballast The output characteristic is constant current output, the lamp current changes little, and the lamp power is increased, which accelerates the aging of the light source, which in turn causes the lamp voltage to be further increased, and the cycle makes the life of the light source fast.
  • the digital ballast power is used to control the electronic ballast, when the voltage of the gas discharge lamp increases, the lamp current decreases, and the lamp power also decreases, so that the gas discharge lamp can obtain a longer life and at the same time save energy. And the role of protecting the environment.

Description

一种控制气体放电灯输出功率的方法及电子镇流器 技术领域
本发明涉及照明领域， 尤其涉及一种控制气体放电灯输出功率的方法及电 子镇流器。 背景技术
气体放电灯是通过气体放电将电能转换为光的一种电光源。 气体放电灯的 种类很多，用得较多的是辉^：电和弧光放电。 辉 电一般用于霓虹灯。 弧光 放电有很强的光输出， 照明光源都采用弧光放电。 荧光灯、 节能灯、 高压汞灯、 高压钠灯、 金属卤化物灯、 氙气灯是应用最多的照明气体放电灯。 气体放电灯 具有以下特点： ①辐射光语具有可选择性。 通过选择适当的发光物质， 可使辐 射光镨集中于所要求的波长上， 也可同时使用几种发光物质， 以求获得最佳的 组合光谱。 ②具有高效率， 它们可以把 25 ~ 30 %的输入电能转换为光输出。 ③ 寿命长。 使用寿命长达 1万小时或 2万小时以上。 ④光输出维持特性好， 在寿 命终止时仍能提供 60 ~ 80 %的初始光输出。 气体放电灯在工业、 农业、 医疗卫 生和科学研究领域的用途极为广泛。 除作为照明光源之外， 在摄影、 放映、 晒 图、 照相复制、 光刻工艺、 化学合成、 塑料及橡胶老化、 荧光显微镜、 光学示 波器、 荧光分析、 紫外探伤、 杀菌消毒、 医疗、 生物栽培、 固体激光等方面都 有广泛应用。
各种气体放电灯都由泡壳、 电极和放电气体构成， 基本结构大同小异。 泡 壳与电极之间是真空气密封接， 泡壳内充有放电气体。 气体放电灯不能单独接 到电路中去， 必须与触发器、 镇流器等辅助电器一起接入电路才能启动和稳定 工作。 放电灯的启动通常要施加比电源电压更高的电压， 有时高达几千伏或几 万伏以上。 电弧放电一般都具有负的伏-安特性,即电压随电流的增加而减小。 在 恒定电源条件下， 为了保证光源稳定地工作， 电路中必须串联一具有正阻特性 的电路元件来平衡这种负阻特性， 稳定工作电流， 该元件称为镇流器或限流器。 图 1 示出了现有的带有电子镇流器气体放电灯结构示意图， 其包括： 电磁 兼容（EMI )滤波器、 全桥整流器、 功率因素校正器（APFC )、 单片机、 半桥逆 变器和故障检测等部分电路， 其中： EMI 滤波器用于阻止镇流器产生的噪声传 回电源线，全桥整流器用于将交流电源转换为直流电源， 功率因素校正器 APFC 电路控制交流电输入电流与电压， 产生经过调节的直流母线电压。 单片机实现 频率调制控制实现气体放电灯的启辉、 功率控制、 故障检测等功能， 气体放电 灯管电极上的启辉触发电压是由半桥逆变器和 LC谐振电路控制的，更精确地控 制半桥逆变器的脉宽调制信号就能够更好地控制光衰。 因此， 更好地控制灯电 流也就能实现对输出功率的控制，单片机中的 PWM模块能够提供更高或更精确 的分辨率， 同时具有更好的线性频率控制， 特别是在 30kHz ~ 120kHz范围内。 这样就既可以保证在启动时提供足够的脉冲电压点亮气体放电灯， 同时又可在 稳定状态时提供稳定的工作电流。 通过编程软件控制频率抖动技术， 可实现更 精细的频率步进幅度， 提高频率分辨率从而实现动态频率抖动以灯电流为基准 控制输出功率， 以管电压为参考基准控制光源的光衰量， 从而达到自动调光节 能的目的。
目前国内外无论是数字控制还是模拟控制调光电子式镇流器在配套点燃气 体放电灯时， 不论光源是新光源还是光衰老化光源在工作是时都采用恒功率控 制技术， 即输出功率与灯功率额定值相符合， 由于气体放电灯的工作特性是在 光源开始老化时灯管电压升高， 电子式镇流器的恒功率控制原理是当管电压上 升时管电流减少， 这样灯的输出功率就可始终控制在额定范围内， 比如： 灯管 电压 100V, 灯管电流 4A， 此时输出功率为 400W, 当管电压上升至 120V时， 管电流就下降为 3.34A, 输出功率仍为 400W, 故称此工作原理为恒功率。 而此 时气体放电灯光衰老化之后其支撑的实际发出的光通量已经大大降低， 当其工 作在额定功率时反而会加快气体放电灯的老化， 与此同时老化光源仍然消耗额 定的电能造成浪费。 发明内容
鉴于上述现有技术所存在的问题， 本发明提供了一种控制气体放电灯功率 的方法及电子镇流器， 通过对气体放电灯光衰造成的光通量下降进行功率控制 实现节能和延长光源寿命。
为了解决上述问题， 本发明提出了一种控制气体放电灯功率的方法， 包括: 检测气体放电灯光衰变化量；
根据所述检测到的光衰变化量为所述气体放电灯匹配所对应的实际功率
相应的， 本发明实施例还提供了一种电子镇流器， 包括：
光衰采样模块， 用于检测气体放电灯光衰变化量；
单片机， 用于根据所述光衰采样模块检测到的光衰变化量为所述气体放电 灯匹配所对应的实际功率值；
半桥逆变器， 用于根据单片机匹配的实际功率值调节所述气体放电灯上的 输出功率。
实施本发明实施例， 具有如下有益效果： 通过电子式镇流器能够自动实现 对气体放电灯工作电流及功率的控制， 在光衰发生时气体放电灯无需工作在额 定功率下， 从而节约了能源， 为实现照明节能智能化管理提供了硬件支持。 根 据气体放电灯自身工作特性及工作环境影响产生的过早光衰及老化， 直接导致 了光源的提前 4艮废， 并造成了资源浪费及对环境污染的情况下。 本发明在多节 能的^ ftii上还可大大延长气体放电灯的寿命。 附图说明
图 1为现有的带有调光电子镇流器的气体放电灯的结构示意图；
图 2为本发明实施例中带有电子镇流器的气体放电灯的结构示意图;
图 3为本发明实施例中控制气体放电灯功率的方法流程图。 具体实施方式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
气体放电灯以其光效高、 寿命长、 显色性好等优点而备受瞩 但受现有 技术的制约及气体放电灯外部工作环境及内部工作环境的影响， 100 %的气体放 电灯并未能达到设计寿命就提前报废了， 这对有限的社会资源造成极大的浪费 的同时还加大了对环境的污染， 由于现有技术中采用恒功率控制方法， 导致气 体放电灯越用光效越低同时越用越费电。 本发明通过开发与其配接的高性能数 字光衰功率控制电子式镇流器， 解决了根据气体放电灯自身工作特性及工作环 境影响产生的过早光衰及老化导致的能源浪费， 光源提前报废对资源浪费及对 环境污染的问题。 在多节能的基础上大大延长了光源的寿命， 在节约了资源同 时降低了对环境的污染。
图 2中示出了本发明实施例中的带有电子镇流器气体放电灯的结构示意图， 其包括了电磁兼容滤波器、 全桥整流器、 功率因素功率因素校正器、 半桥逆变 器、 单片机（MCU ) 、 光衰采样模块和气体放电灯， 其中： 光衰采样模块主要 是用于检测气体放电灯光衰变化量； 具体的， 可以根据检测所述气体放电灯所 在的管电压变化量； 或者检测所述气体放电灯所在的管电流变化量； 或者检测 所述气体放电灯所在的逆变电压频率变化量等方式来实现。
单片机（MCU ) 主要是用来根据光衰采样模块检测到的光衰变化量为气体 放电灯输出匹配所对应的实际功率值；
具体的， 该单片机（MCU )根据所述检测到的光衰变化量按照比例降低所 述气体放电灯上的输出功率， 根据所述输出功率为所述气体放电灯匹配所对应 的实际功率； 这里的按照比例降低气体放电灯上的输出功率可以根据光衰变化 情况来建立合适的比例关系， 使其匹配的实际功率与气体放电灯所对应的实际 发出的光通量相吻合。
或者， 该单片机（MCU )根据所述检测到的光衰变化量在预设的特征库中 为所述气体放电灯输出匹配所对应的实际功率， 该预设的特征库中存储有气体 放电灯光衰变化量以及与所述光衰变化量所对应的所述气体放电灯所对应的实 际输出功率值。 该预设的特征库中的数据可以是根据气体放电灯特性采样后而 完成的一系列数据的采集运算， 比如在光衰变化情况下， 气体放电灯管压每上 升 5伏或者 10V时， 其所对应的实际发出的光通量。
半桥逆变器主要是根据单片机（MCU ) 匹配的实际功率值来调节气体放电 灯上的输出功率。
具体的， 该半桥逆变器可以根据匹配的实际功率值调节输出到气体放电灯） 上的输入电压、 电流、 或者同时调节电压和电流。
气体放电灯电子镇流器的工作频率一般工作在高频 30KHZ - 120KHZ左右， 启动时灯管（峰 -峰值）启动电压通常都在 500V ~ 6kV的启动触发电压， 稳定工 作后灯管电压（有效值）却在 100V— 200V之间 （国家标准）。 但电子镇流器半 桥高频逆变器输出的灯电压及频率信号的和幅度都极不稳定， 随着灯管工作环 境和器件发热会发生显著变化， 采用常规的峰值检波检测电路或平均值检波电 路等方法来检测灯管电压的有效值会有较大的误差， 因此， 光源光衰信号的采 集精度设计是本发明的重点和难点。 通过对气体放电灯工作状态的观察发现当 气体放电灯的工作环境温度高于 100度（指高压气体放电灯）， 自身工作温度高 于 80度（指低压气体放电灯）时就开始出现光衰现象， 当出现光衰现象时管电 压及管电流都会出现变化， 既管电压上升管电流下降， 从而导致光效下降， 导 致光源早衰的原因有春种： 1、 工作环境温度的升高， 2、 电极发射能力下降， 3、 长期超功率工作。 在实施本发明过程中， 才 M居气体放电灯的特性来检测光衰 时管电压及管电流的变化量来控制气体放电灯的输出功率， 以达到输出功率与 光源光衰时的光通量相对应， 从而达到节能及延长光源寿命的目的。
在实施本发明实施例中， 当光源开始发生光衰现象时半桥逆变器输出的管 电压会相应升高， 管电流会减少， 亮度同时相应减低， 因此通过光衰采样模块 来对气体放电灯上的光衰信号的进行采样，当气体放电灯的管电压发生变化（变 化范围为， 高压气体放电灯 110V-160V, 低压气体放电灯 160V-200V )时， 光衰 采样模块将采集到的管电压输入至测量 IC, 测量 IC将杂乱的灯管光衰电压信号 转换为对应的有效值直流电压后输出， 经过两个反向比例放大器放大后输入到 单片机（MCU )的模数转换器（ Analog-to-digital Converter ) 中， 单片 /^采集 到的光衰直流电压， 利用单片机中的可编程模拟比较器模块（可编程比较器参 考管电压， 如以 110V为例进行说明）进行比较， 根据比较的结果对应改变控制 半桥驱动的频率， 从而改变灯的功率。 灯功率的变化主要根据半桥逆变器的输 出电压 Vof和输出电流 Iof的反馈值决定， 即： PL=VofxIof, 当管电压 V超过基准 参考电压 110V上限时， 单片机将改变驱动半桥逆变器开关管栅极的频率， 开关 管的输出电流就会变小， 灯功率就会按比例下降。 每当光衰发生时管压会升高， 管电流下降为了与光衰发生时管压与光通量的变化基本对应， 适当的控制管电 流的下降， 比如： 当管压每上升 10V， 功率就自动下降 5W-20W (控制高压气体 放电灯）， 当管压上升至 160V时功率下降 30- 120W,管电压如继续上升超过 160V 后保护电路将启动关闭半桥逆变器输出。 或每当管压上升 50-10V功率下降 1-2W (控制低压气体放电灯）。 这样就可以实现当光源在开始发生光衰后光通量下 降时功率也按比例下降从而达到光衰功率的自动闭环控制。 当然， 在本发明实施例过程中也可以通过检测光衰情况下气体放电灯上的 电流变化情况以及逆变电压的频率变化来实现对气体放电灯输出功率的控制。
相应的， 本发明实施例中还示出了一种自动控制气体放电灯功率的方法， 包括如下步骤：
S301 : 检测气体放电灯光衰变化量；
具体的， 可以根据检测所述气体放电灯所在的电压变化量； 或者
检测所述气体放电灯所在的电流变化量； 或者
检测所述气体放电灯所在的逆变电压频率变化量。
需要说明的是， 这里的变化量在光衰到一定的程度时， 其不在需要对气体 放电灯进行功率调节了， 其停止对气体放电灯的供电， 因此时的气体放电灯已 经处于 4艮废状态， 其不能正常的为用户提供照明。
S302: 根据所述检测到的光衰变化量为所述气体放电灯输出匹配所对应的 实际功率值；
具体的是根据所述检测到的光衰变化量按照比例降低所述气体放电灯上的 的按照比例降低气体放电灯上的输出功率是可以根据光衰变化情况来建立合适 的比例关系， 使其匹配的实际输出功率与气体放电灯所对应的实际发出的光通 量相差不大。
或者根据所述检测到的光衰变化量在预设的特征库中为所述气体放电灯匹 配所对应的实际功率比较值， 所述预设的特征库中存储有气体放电灯光衰变化 量以及与所述光衰变化量所对应的所述气体放电灯所对应的实际功率值。 该预 釆集运算， 比如在光衰变化情况下， 气体放电灯管压每上升 5伏或 10V时， 其 所对应的气体放电灯所对应的实际发出的光通量。
S303: 根据所述匹配的实际功率值调节所述气体放电灯上的输出功率。 具体的，
或输入电流。
实施本发明实施例， 根据气体放电灯工作特性， 气体放电灯寿命在工作环 境温度过高及后期管压会逐步升高， 这时在传统电感式镇流器电路中， 电感式 镇流器的输出特性为恒流输出， 灯电流变化很少， 使灯功率提高， 这会加速光 源的老化， 进而又促使灯管电压进一步提高， 如此循环使光源寿命快速寿终。 而使用数字光衰功率控制电子式镇流器时， 当气体放电灯管电压提高时， 灯电 流下降， 灯功率也随之下降， 使气体放电灯能获得更长的寿命， 同时也起到节 能及保护环境的作用。
以上所揭露的仅为本发明一种较佳实施例而已， 当然不能以此来限定本发 明^又利范围， 因此依本发明权利要求所作的等同变化， 仍属本发明所涵盖的 范围。

Claims

权 利 要 求 书
1、 一种控制气体放电灯输出功率的方法， 其特征在于， 包括：
检测气体放电灯光衰变化量；
根据所述检测到的光衰变化量为所述气体放电灯匹配所对应的实际功率 值；
根据所述匹配的实际功率值调节所述气体放电灯上的输出功率。
2、 如权利要求 1所述的方法， 其特征在于， 所述检测气体放电灯光衰变化 量包括：
检测所述气体放电灯所在的电压变化量； 或者
检测所述气体放电灯所在的电流变化量； 或者
检测所述气体放电灯所在的逆变电压频率变化量。
3、 如权利要求 2所述的方法， 其特征在于， 所述根据所述检测到的光衰变 化量为所述气体放电灯匹配所对应的实际功率值包括：
根据所述检测到的光衰变化量按照比例降低所述气体放电灯上的输出功 率， 根据所述输出功率为所述气体放电灯匹配所对应的实际功率。
4、 如权利要求 2所述的方法， 其特征在于， 根据所述检测到的光衰变化量 为所述气体放电灯匹配所对应的实际功率值包括：
根据所述检测到的光衰变化量在预设的特征库中为所述气体放电灯匹配所 对应的实际功率， 所述预设的特征库中存储有气体放电灯光衰变化量以及与所 述光衰变化量所对应的所述气体放电灯所对应的实际功率值。
5、 如权利要求 1至 4任一项所述的方法， 其特征在于， 所述 据所述匹配 的实际功率值调节所述气体放电灯上的输出功率包括：
根据所述匹配的实际功率值调节所述气体放电灯上的输入电压和 /或输入电 流。
6、 一种电子镇流器， 其特征在于， 包括：
光衰采样模块， 用于检测气体放电灯光衰变化量；
单片机， 用于根据所述光衰采样模块检测到的光衰变化量为所述气体放电 灯匹配所对应的实际功率值；
半桥逆变器， 用于 4艮据单片机匹配的实际功率值调节所述气体放电灯上的 输出功率。
7、 如权利要求 6所述的电子镇流器， 其特征在于， 所述光衰采样模块用于 检测所述气体放电灯所在的电压变化量； 或者检测所述气体放电灯所在的电流 变化量； 或者检测所述气体放电灯所在的逆变电压频率变化量。
8、 如权利要求 7所述的电子镇流器， 其特征在于， 所述单片 艮据所述检 测到的光衰变化量按照比例降低所述气体放电灯上的输出功率， 根据所述输出 功率为所述气体放电灯匹配所对应的实际功率。
9、 如权利要求 7所述的电子镇流器， 其特征在于， 所述单片 W艮据所述检 率， 所述预设的特征库中存储有气体放电灯光衰变化量以及与所述光衰变化量 所对应的所述气体放电灯所对应的实际功率值。
10、 如权利要求 6至 9任一项所述的方法， 其特征在于， 所述半桥逆变器
Figure imgf000011_0001
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CN101600287A (zh) 2009-12-09

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