在全球能源危机背景之下,作为最新一代照明电光源的发光二极管(Light Emitting Diode, LED)凭借其节能、环保、寿命长、体积小等优点在各个照明领域广受欢迎,并在不断开拓新的应用场 景[1-3]。IEC 61000-3-2 Class C标准对LED驱动电源的谐波和功率因数提出要求,LED驱动电源应具备功率因数校正(Power Factor Correction...
We deduced from these plots the carrier lifetime, differential diode resistance, diffusion capacitance, parasitic resistance, and the ideality factor of each diode. The parameters were then used in the equivalent circuit to calculate the modelled input impedance of the device which was then compared ...
Keywords:LLC;LEDdriver;resonantcircuit 0 引 言 1 LED驱动技术概述 随着IED(Light—EmittingDiode)技术的发展和 广泛应用,大功率LED(High—PowerLight-Emitting Diode)照明在能源危机日趋严重的今天越来越受到世 界各国的高度重视。LED由于具有高效节能、无汞毒 ...
LEDs consist of semiconducting material mixed with impurities to create a p-n function similar to a diode. Atoms in the n-type material have free electrons, and n-type materials have electron holes. A positive voltage on the p-side and a negative voltage on the n-side generate forward bias...
发光二极管(Lighting Emitting Diode,LED)具有光效高、无污染、寿命长等特点,成为第四代新光源[1-3]。LED驱动电源是整个照明系统中的核心部件,应具备功率因数高、效率高、成本低和寿命长等优点。LED驱动电源一般采用两级结构,如图1所示,包括适配器和驱动器。 图1 两级LED驱动电路结构Fig.1 Block diagram of conve...
1.A light-emitting diode (LED) drive circuit for controlling a leakage current, comprising an input circuit, a rectifier circuit, a power source control module, and an LED load module, which being successively coupled; wherein the LED drive circuit further comprises a leakage current proof contr...
发光二极管(LED,lightemittingdiode)凭借其高效节能、绿色环保、寿命长、可靠性高等优点得到了广泛应用,正在逐渐取代传统的白炽灯、荧光灯成为新一代照明光源。随着大功率白光LED在灯光装饰、背光源和照明中的普遍应用,大功率白光LED驱动芯片的需求也越来越大,因此开发与功率型LED配套的大功率LED驱动芯片具有十分广阔的...
The present invention relates to a Light Emitting Diode (LED) driving circuit; in particular, to a LED driving circuit driven by constant current. 2. Description of Related Art Referring to FIG. 1, which shows a prior art LED driving device. The LED driving device comprises a constant curren...
近期,美国国家标准协会ANSI发布了针对LED驱动电源、LED控制器的ANSI UL 8750-2018 Light Emitting Diode (LED) Equipment for Use in Lighting Products的安全标准更新,主要更新了Type IC LED 驱动电源、Wired Control Circuit 调光线路的安全隔离要求和解决方案。
8.The power supply circuit of claim 1, wherein the shunt current circuit comprises a zener diode having a cathode connected to the first output terminal of the constant current control circuit, and an anode connected to the ground. 9.The power supply circuit of claim 1, wherein the energy...