电子镇流器控制器中压控方波发生器的实现方法

本文针对预热式荧光灯，提出一种应用于电子镇流器可实现荧光灯工作需要的频率变化曲线的CMOS压控方波发生电路。该电路应用于电子镇流器的低压控制部分，实现了荧光灯在预热、启动和工作各阶段的频率要求。频率特性曲线完全符合IR公司提出的荧光灯工作频率变化曲线。利用本文提出的方法也容易推广到其他需要电源频率随时间变化的场合。     

一种高性能、低成本、大功率高压钠灯用电子镇流器

<正> 前言 高压钠灯电子镇流器是在普通荧光灯电子镇流器基础上发展起来的,其原理与普通荧光灯电子镇流器是很接近的,都是一种高频交流交换器。但在电路上要比普通荧光灯电子镇流器复杂得多,其主要原因是: 1.高压钠灯工作于电弧放电状态,灯管内的气体压强受环境温度的影响很     

一种新型的荧光灯电子镇流器用振荡电路的简易实现方法

本文针对预热式荧光灯，提出了一种应用于电子镇流器的可以实现荧光灯工作需要的频率变化曲线的CMOS方波发生器电路。该电路用于电子镇流器的智能功率集成电路中的控制部分，不仅完成了荧光灯在预热、启动及正常发光各阶段的频率要求，而且具有结构简单、外接元件少、成本低、频率可调控等优点。利用本文提出的方法也容易推广到其它需要电源频率随时间变化的场合。     

基于FAN7711的电子镇流器原理与设计

介绍了FAN7711镇流器控制IC的主要特点及基于FAN7711的荧光灯电子镇流器原理与设计.     

40W双管荧光灯电子镇流器

目前市面上流行的40W及40W以上荧光灯电子镇流器存在的突出问题表现为性能低劣,可靠性与安全性差。事实已经证明,采用常规的电路和技术很难实现产品标准规定的有关荧光灯交流电子镇流器的性能要求和安全要求。三星公司推出的KA7531控制及驱动IC,为设计30W以上荧光灯电子镇流器提供了一切所必须的功能。     

电子镇流器设计与制作的关键问题及优化措施

介绍了绿色照明中的关键器件——常用荧光灯的电子镇流器,重点分析了电子镇流器的应用中值得关注的工作频率、电源滤波、预热启动、异常状态保护、结构设计以及器件匹配等问题,并提出优化措施;总体构思了未来性能优良的电子镇流器的功能结构。     

大功率紫外灯启动的模型预测控制策略

针对大功率紫外灯启动的电流控制问题,提出了一种基于模型预测实现电子镇流器的控制方法.首先建立了电子镇流器的数学模型,以该模型为基础构建了系统控制的预测模型,通过采样经过三相不控整流和滤波之后的直流电压值和Buck电路的电感电流值建立平均状态方程,以最优性能为指标,求解最优开关状态,对电子镇流器电路进行控制.仿真及实验表明该模型预测控制器在紫外灯点火启动过程中具有良好的动态性能,有效控制了电子镇流器.     

IR采用绿色芯片控制白光

国际整流器公司(IR)的两种新型IC可简化照明控制设计,并可提高灯的效率.IR2520D是一种耐用的自适应CFL(小型荧光灯)照明镇流器设计的核心件.该芯片可使镇流器的元件数量减少20%,与传统的电子镇流器设计相比,可提高镇流器的可靠性,并可补偿由于温度和老化而引起的电灯特性变化(见照片).     

新型荧光灯启动器和系列电子镇流器投产

新型荧光灯启动器和系列电子镇流器投产华东电子管厂开发的ＹＱ２２０／４－６５型荧光灯用启动器进行了设计生产一次性定型并投产，该启动器是预热式荧光灯的附件，它与目前市场上的同类产品性能相比，具有启动快（启动时间１５ｓ）、寿命长（６５００次）、安全可靠等特...     

简易电子镇流器

<正> 本文介绍的简易电子镇流器与电感镇流器相比,具有以下特点:(1)在额定电压下,节电效率高达30％以上,反光强度超过电感镇流器;(2)启动电压范围大,即使在小于100(?)的条件下,也能点亮荧光灯;(3)工作时无杂声无频闪,具有减少眼睛疲劳,保护视力的作用;(4)不用启辉器,一次启动时间小于1.5s,从而减少了瞬闪电压、电流对荧光灯的频繁冲击,相对延长了荧光灯的寿命三四倍;(5)体积小、重量轻、安装简便,应用范围广。 工作原理 该电子镇流器电路如图1所示。它由二极管、电容、滤波扼流圈组成。当a端交流电为正半周时,二极管VD2、     

数字控制金卤灯电子镇流器样机设计

本文基于金卤灯电子镇流器数字控制策略分析的基础上,对其电路拓扑的主电路和控制电路进行设计,即对PFC、DC/DC、DC/AC三级结构的主电路及控制电路模型和参数进行选择、设计,并研制了一台高功率因数低频方波输出的数字控制金卤灯电子镇流器,通过对实验结果分析验证了所提出的数字控制方案是可行的。     

A novel single-stage push-pull electronic ballast with high inputpower factor

A novel single-stage push-pull electronic ballast with high input power factor is presented in this paper. The proposed electronic ballast combines the front-end power-factor corrector and push-pull converter into a single-stage power converter. Compared to the single-stage class-D electronic ballast, the proposed circuit does not require an isolated driver. The control of the circuit is easier and the cost less. The circuit of the ballast is analyzed and the design guidelines are listed. The experimental results verify the theoretical derivation     

一种用于投影光源的高性能电子镇流器

提出了一种用于投影光源的高性能电子镇流器.主电路采用无源无损的缓冲电路,减小了由于续流二极管反向恢复所引起的开通损耗,提高了镇流器的效率.以数字控制器为核心,结合模拟方式的PWM控制,实现了恒功率控制.分析了镇流器的工作原理并给出了实验结果,实验结果表明该镇流器具有电路简单、可靠性高的优点,实验样机的效率达到了94%.     

一种E类驱动单级式电子镇流器的仿真研究

提出了一种E类驱动结构的谐振式电子镇流器,将E类结构和buck-boost功率因数校正结构整合成一种单级式电子镇流器。由于E类驱动式的谐振电路只需一个开关管,经过整合后的电路也只需一个控制电路和一个开关管,进一步降低了镇流器的成本提高了效率。文章分析了E类镇流器电路工作在最佳情况下的工作状态,仿真采用脉宽调制控制电路工作。     

A Novel Constant Power Control Circuit for HID Electronic Ballast

This paper presents a constant power control circuit for a three-stage high-intensity discharge (HID) electronic ballast. The three-stage electronic ballast is composed of a boost pre-regulator to achieve a high power factor, a DC/DC buck converter to regulate lamp current with constant lamp power, and a full-bridge inverter to drive the HID lamp with a low-frequency ac squarewave current. The buck converter operating in current mode utilizes current sense level-shift technique to achieve constant power output. The proposed constant power control circuit is easily designed and implemented for the three-stage HID electronic ballast. Finally, a laboratory prototype of a 70 W HID electronic ballast is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation (less than 0.6%).     

Single-switch electronic ballast with continuous input current charge pump power-factor correction

This paper presents a single-switch electronic ballast with continuous input current charge pump power-factor correction. The ballast circuit is composed of a series/parallel inverter, a charge pump power-factor corrector, and a dimming controller. The characteristics and design considerations of this ballast are discussed in this paper. Dimming control is achieved by varying the switching frequency. The frequency-modulation scheme is used to reduce the low-frequency output current ripple. A prototype of a 36WT8 fluorescent lamp ballast has been implemented and tested. Experimental results verify the analytical derivations.     

Single switch unity-power-factor dimmable fluorescent lamp ballastcircuit

The authors propose an electronic ballast circuit which is capable of achieving high power factor, high efficiency, dimming control, and freedom from lamp flickering. All these features are accomplished with a single-switch power circuit, and a low-cost control circuit. Experimental results are given     

250W高压钠灯电子镇流器的研究

为满足人们对绿色照明的要求,该文设计了节能、高功率因数及总谐波失真低的高压钠灯电子镇流器来替代传统的电感式镇流器,采用有源功率因数校正、恒功率控制、低频方波驱动的三级式结构的电路设计,并搭建了样机,实现了160V～265V宽电压输入,功率因数PF≥0.99,总谐波畸变因数THD≤9．1％,电路可靠工作,通过了电磁兼容传导干扰测试。     

A Novel Discrete Dimming Ballast for Linear Fluorescent Lamps

A novel discrete dimming ballast for linear fluorescent lamps is proposed in this paper. A proposed dimming control circuit is combined with a ballast module for multiple lamps to realize control of three discrete lighting levels. Compared with conventional step dimming or on– off control methods, the proposed discrete dimming method has the following advantages: 1) digital signal is generated by the dimming control circuit to control the lamps' turn- on and -off, which makes the system more reliable and integrated; 2) the proposed discrete dimming system replaces relays, which are necessary in conventional lamp on–off control, and therefore decreases the system cost; 3) the proposed dimming ballast can be installed by keeping the original wiring system. This makes the upgrading of a lighting system more effective and efficient; 4) the dimming control circuit also provides a good isolation for operating the low-voltage wall switches by hand safely. Both theoretical, simulation, and experimental results are in good agreement.      

Acoustic-Resonance-Free High-Frequency Electronic Ballast for Metal Halide Lamps

To avoid the acoustic resonance on operating metal halide lamps, an autofrequency-searching method is implemented on the high-frequency electronic ballast. The proposed method allows the use of a high-frequency electronic ballast, making the ballast able to adjust the operating frequency automatically as soon as the acoustic resonance is detected and, consequently, to locate it at a stable frequency. The electronic ballast achieves a high efficiency and a high power density through the employment of a high-frequency resonant inverter with an embedded buck-boost converter for power-factor correction and lamp power regulation. The control strategy is realized by a microprocessor along with the acoustic-resonance detection circuit. The operation of autofrequency searching is illustrated by the experiments on an electronic ballast designed for 70-W metal halide lamps.