【摘 要】
：
Light emmiting diode (LED) lighting is becoming more and more popular in both commercial and residential lighting system for its energy-efficiency and environmental-friendly merits.For high end lighti
【机 构】
：
Silergy Corp.,90 Wensan Road,Hangzhou Institute o
论文部分内容阅读
Light emmiting diode (LED) lighting is becoming more and more popular in both commercial and residential lighting system for its energy-efficiency and environmental-friendly merits.For high end lighting system,dimming and color control are always required,which are known as smart lighting.In this paper,a cost-effective power factor corrected (PFC) flyback pre-regulator is presented for smart lighting application.To reduce system cost,it adopts primary side regulation (PSR) control,thus eliminates secondary side output sensing and opto-coupler in conventional isolated flyback PFC control circuitry.For PSR control,the output voltage is reflected to the auxiliary winding only during the secondary side diode conducting period.It is difficult to sense the output voltage when the secondary side diode conduction time is short,even more difficult during the light load and valley of input voltage.Adaptive blanking time (ABT) control is proposed to avoid fault sensing and keep precise output regulation under those circumstances.A 36w demonstration board with this control method was built.Test results showed that output voltage regulation is better than that without ABT control.Power factor (PF) of 0.96 and 7.6% of total harmonic distortion (THD) under 220V rms input,and PF of 0.99 and THD of 11.2% under 110V rms has been achieved.With the proposed idea,the IEC61000-3-2 THD control standard for lighting system is implemented in a low-cost way.
其他文献
地球静止轨道(GEO)卫星由于独特的高轨和静地特性,在通信、气象、侦察、导航定位、授时、跟踪与数据中继以及科学研究等方面发挥着越来越重要的作用,地球静止轨道卫星的自主定轨技术已经成为我国迫切需要发展的航天新技术之一.针对利用星地观测数据对GEO卫星实现定轨存在观测几何差的问题,本文提出了一种基于优化PDOP值星间链路的GEO卫星自主定轨方法.首先,基于建立的仿真场景分析了MEO卫星与GEO卫星所建
For the sake of steadily tracking carrier signal under high dynamic or low C/N0 (Carrier to Noise Power Ratio) environments,during various tracking loop structure of GNSS (Global Navigation Satellite
Indoor location based servicedemandsprecisevertical height information and its degree of distinguishing in the vertical position should be decimeter,so that we can precisely recognize the building flo
Pulse navigation signal is usually utilized to carry navigation in-formation instead of continuous signal by pseudolite navigation systems such as LOCATA,whose carrier tracking methods commonly use tr
The aerospace TT&C system plays an important role in tracking space-craft,and it is necessary for maintaining its good performance and precision.This paper focuses on the application of BDS in the pre
Earth Orientation Parameters (EOP) is essential for spacecraft navigation missions,such as deep space navigation and GNSS navigation mission,directly affecting navigation accuracy of spacecraft.Firstl
In this paper,a high-performance compact rubidium frequency standard (CRFS) has been successfully developed,of which the frequency stability (Allan variance) reached 3E-12/τ0.5(τ=1s~1000s) and frequen
Based on the correlation coefficient between the time series of the GPS network,extracting the common mode error(CME) using principal component analysis(PCA) in Crustal Movement Observation Network of
Three different LED intelligent lighting architectures are analyzed and four interoperability support elements are extracted.Three levels of lighting interoperation modes that can be utilized in LED i
Sidereal filtering is effectiveto mitigatemultipath errors from observations or coordinates by taking advantage of the sidereal repeatability of GPS multipath signals.However,the characteristics of BD