白光LED在照明应用中的阵列方式及匹配

介绍了白光LED照明中的电学特性及驱动电源的输出形式,主要分析了不同结构的LED阵列方式的特点、使用优势,以及在照明应用中与驱动电源的输出匹配的要求。     

白光发光二极管在照明应用中的阵列方式及匹配

白光发光二极管(LED)在照明应用中具有突出的技术优势,被誉为新一代照明光源的代表。文章主要介绍了白光发光二极管(LED)照明自身的光学特性、电学特性以及驱动电源的输出形式,并在各自相互比较的基础上探讨了不同结构LED阵列的构成方式、工作特点、使用优势,以及与驱动电源的输出匹配等相关问题。此外介绍了照明应用中的要求和注意事项。     

从LED封装探究户外照明灯具的系统设计

LED用于户外照明,特别是道路照明已在近两年得到快速的示范应用和推广,LED技术的成熟度和相关器件、产品的性能在应用过程中取得了很大的提升。然而,就LED目前的光效与现有传统照明灯具的光效相比还有较大差距,LED户外照明灯具作为一个系统,LED本身的可靠性和稳定性,驱动电源的性能和匹配程度,配光曲线的基本要求以及机械设计的合理性等都制约着整灯作为一个整体LED照明系统的性能体现。本文从LED封装技术和工艺的提升和改善,通过内量子和外量子效率的提升使得LED初始光效尽可能的提高,并探究LED户外照明灯具系统更趋合理的设计,而进一步提升整灯的系统性能。     

大功率发光二极管照明交流驱动电源架构及光源匹配

伴随着技术的发展,在采用交流市电工作的通用照明领域,大功率的发光二极管(LED)照明将具有更为优越的技术和经济优势。通常认为光源功率在数十瓦至数百瓦范围的就是大功率LED光源。主要应用于城市的主次干道、高架桥、隧道、高大车间等需要大量光输出的照明场合。此外,基于功率型1W白光LED的技术已经成熟,所具有的性能一致、发热量低、光效率高、易于散热、易于变化组合、易于控制及价格低廉等特点,已经为主流芯片在大功率LED照明方面得到了广泛的应用。通过研究大功率LED照明交流驱动电源的架构,探讨关于多颗LED的阵列方式以及匹配等相关问题,以满足大功率光输出的要求。其中对驱动电源的电路架构和输出匹配将重点探讨,并提出利用合理的LED阵列方式以达到使驱动电源输出功率分散、主要功率元件承受的应力较小、电路成本低以及易于实现等优势。     

LED灯在室外景观照明中的应用

LED是节能的光源,该丈结合LED灯的基本发光原理、主要优点,说明了在城市室外景观照明中应用的优势,并根据其作用分类介绍了LED为光源的各种灯具的性能指标及其使用场合,指出虽然LED灯在景观照明中存在一些问题,但随着制造技术的发展,作为一种绿色照明技术,LED灯必然在室外景观照明得到广泛应用。     

PT4107通用型高亮LED驱动IC

PT4107是一款针对高功率LED照明的PWM恒流控制器,输入电压既町以是传统的110V／220V交流电,义可以是不低于18V的直流电。该芯片采用峰值电流检测方式,为大功率LED提供恒定的供电电流,并具有数字脉冲调光和线性调光功能．整体供电效率可达88％,且可靠性高,主要用于离线式LED驱动、LED日光灯、LED环境照明、LED交通信号灯等电路中。     

光伏LED照明驱动电路普适性控制器的研究

光伏电池的输出电压变动范围大,而LED在工作时对电压电流的稳定性要求较高,必须使用与之匹配的驱动电路。结合光伏电池的输出特点,在分析不同驱动电路的基础上,设计了一种具有普适性的LED照明驱动控制器,该控制器能自动适应光伏电池输出电压的大幅变化和LED负载的变化,适用于不同LED负载的驱动。其适应性强,调节范围大,在LED照明领域具有较好的应用前景。     

聚积科技推出新LED产品线

LED驱动IC厂商深圳市聚积科技有限公司为拓展产品线,今年强打LED照明领域,将积极推出新产品完整并强化产品线,而针对LED建筑照明应用,聚积科技也正式推出新款40V内建电源管理功能的三信道恒流LED驱动器,主打LED建筑照明、LED窗帘灯、LED灯条、LED招牌广告字、LED霓虹灯等应用。     

浅谈LED灯具的驱动工作原理

近年来,LED照明灯具得到飞跃式的发展,LED作为绿色环保的清洁光源得到广泛的认可。LED光源使用寿命长、节能省电、应用简单方便、使用成本低,因而照明领域得到广泛的应用。据欧司朗光学半导体公司2008年调查统计,全球每年家庭照明灯座出货量约为500亿个。     

情景照明系统的LED混色技术研究（上）

本文从色度学和LED混色原理出发,分析研究了三原色理论、颜色匹配和LED光源在情景照明系统混色技术中的应用,为空间内情景照明系统的设计提供了理论基础。     

一种适用于TRIAC调光器的原边恒流控制LED驱动电路

高亮度LED用于家用照明是未来的发展方向,并已开始作为产品应用。传统家用双向可控硅（TRIAC）调光器适合调节白炽灯和卤素灯这类电阻性负载,当用其对普通LED驱动等开关电源负载调光时会产生闪烁的问题,更不能实现宽范围的调光控制。文中设计了一种适用于双向可控硅（TRIAC）调光器的原边恒流控制低成本LED驱动电路,详细介...     

A buck-boost integrated high gain non-isolated half-bridge series resonant converter for solar PV/battery fed multiple load LED lighting applications

Solar photovoltaic (SPV) or battery fed multiple load LED lighting applications are gaining importance these days, which require independent voltage regulation and dimming control. Half-bridge resonant converters are mostly used due to their simple structure. In this paper, a buck-boost integrated high gain non-isolated symmetrical half-bridge series resonant converter is proposed for multiple load LED lighting applications. With the aid of integrated buck-boost operation, the output voltage can be regulated below and above the nominal input voltage effectively and can produce twice the gain as compared with classical half-bridge converters. Frequency modulation is implemented for output voltage regulation. Pulse width modulation (PWM) dimming has been adopted for illumination control. The proposed driver results in several advantages such as low cost, compact size, improved efficiency due to soft-switching, simple control, independent dimming, and effective operation for multiple loads. Thus, the proposed non-isolated driver configuration is well suited for SPV/battery fed multiple load LED lighting applications. The proposed configuration is tested with single LED load of 22 W and dual-LED loads of 22 W and 43 W. There is an excellent consensus between the simulation and the experimental outcomes.     

A single‐stage LED lamp driver with low DC bus voltage for general lighting applications

In this paper, we study the feasibility of a single‐stage lighting LED lamp driver with low DC bus voltage. The operating principles and design considerations for the LED lamp driver in this study are analyzed and discussed in detail. A laboratory prototype has been built and tested. Using the prototype, high efficiency, high‐power factor and LED current control were achieved using a wide AC input voltage range from 90 to 270 V. Copyright © 2010 John Wiley & Sons, Ltd.     

High Power Factor Light-emitting Diode Driver on Digital Signal Processor Without Electrolytic Capacitor for High-power Lighting

Abstract—Electrolytic capacitor is a key factor that limits the life-time of the driver in a high-power light-emitting diode (LED) lighting. This article presents a high-power LED lighting driver on a digital signal processor without an electrolytic capacitor. The driver is composed of three stage circuits. The first stage is the boost power factor correction converter to achieve a high power factor. As it does not use an electrolytic capacitor, the output voltage ripple is larger, which directly affects the overall performance of the LED driver. Consequently, it must be optimized through the second and third stages. The second stage is the two-output LLC (Double inductance and capacitance) resonant converter, which is driven by a digital signal processor. This stage provides galvanic isolation and reduces voltage. The third stage is the two-input buck converter based on digital signal processor control that reduces the low-frequency ripple generated from the first two stages. Moreover, the regulation of each LED string current is achieved at this stage. The simulation and experimental results show that this LED lighting driver can achieve a high power factor and good constant current characteristics.     

一种线性大功率LED驱动电路设计

可靠而稳定的驱动电路是LED照明的关键.运用LED线性驱动芯片NUD4001设计了LED线性驱动电路.驱动3个2W的LED发光,驱动电流达600 mA.分析了电路的工作原理,并重点提出了包括LED驱动部分和PWM调光部分的详细设计方案.并对电路进行了相关参数的测试.结果表明,该驱动电路具有PWM线性度良好,性能稳定,纹波电流小,体积紧凑等优点.适用于各种LED照明场合.     

高功率因数谐振式无桥型LED驱动电源

针对传统 LED 驱动电源交流输入侧整流二极管导通损耗大的问题,提出了一种高功率因数谐振式无桥型 LED 驱动电源。该驱动电源利用谐振网络实现了正负极性增益,即无论是正电压输入还是负电压输入,负载端均可以实现正电压输出,进而实现了无桥输入。同时,利用谐振电容电荷平衡实现了各输出支路均流,解决了并联 LED 串的均流驱动问题。该驱动电源中的双向有源开关仅采用一个控制信号,简化了控制电路。本文对该 LED 驱动电源的工作模态及工作特性进行了理论分析。该驱动电源具有结构简单、输出升降压、电气隔离等优点。最后,搭建了一台 98W 的实验样机,验证了理论分析的正确性及可行性。     

一种高效低纹波调光LED驱动频闪的研究

随着LED照明行业及LED驱动电源技术的发展,具有调光功能的LED驱动电源在LED照明中的应用越来越多,对其调光性能的要求也越来越高.通过对一种高效低纹波调光LED驱动频闪实现方式进行研究,使其既满足LED低纹波电流的要求,又能使LED灯在调光过程中无闪烁、亮度变化均匀柔和,并且可适应不同的调光曲线要求.     

A universal‐input high‐power‐factor power supply without electrolytic capacitor for multiple lighting LED lamps

The AC–DC power supply for LED lighting application requires a long lifetime while maintaining high‐efficiency, high power factor and low cost. However, a typical design uses electrolytic capacitor as storage capacitor, which is not only bulky but also with short life span, thus hampering performance improvement of the entire LED lighting system. In this article, a SEPIC‐derived power factor correction topology is proposed as the first stage for driving multiple lighting LED lamps. Along with a relatively large voltage ripple allowable in a two‐stage design, the proposal of LED lamp driver is able to eliminate the electrolytic capacitor while maintaining high power factor and high efficiency. To further increase the efficiency of LED driver, we introduced and used the twin‐bus buck converter as the second‐stage current regulator with Pulse Width Modulation (PWM) dimming function. The basic operating principle and the deign consideration are discussed in detail. A 50‐W prototype has been built and tested to verify the proposal. Copyright © 2011 John Wiley & Sons, Ltd.     

An efficient full-bridge resonant converter for light emitting diode (LED) application with simple current control

New power control is introduced in the full-bridge dc-dc converter to drive an LED lamp in this paper. LEDs are semiconductor devices that behave like a constant voltage load with low equivalent series resistance (ESR). Hence, they require precise control for current regulation. In the proposed driver, the LED lamp is driven by two voltage sources connected in series through a series resonant circuit. It processes the majority of lamp power through the full-bridge diode rectifier and supplies small power through a center-tapped rectifier. The LED lamp current is controlled at the selected operating current by using center-tapped rectifier output voltage. In addition, pulse-width modulation (PWM) dimming is implemented. The proposed topology features zero-voltage switching (ZVS), regulation of lamp current, dimming operation, and high efficiency. The working principle, performance, and prototype validation are given for the proposed LED driver.