PWM design for lighting condition

Time:2014/9/23  keywords:LED Street Light


         LED Street Light   dimming technology at present mainly adopts two ways: analog dimming, and the tone light.Using pulse width modulation (PWM) to set up the cycle and the duty may be the most simple implementation method of digital dimming.   From the perspective of the prospects of driver IC, LED street light adopts analog dimming is facing a serious challenge, this is the precision of output current.Almost every LED drivers are used to identify the current a series resistance.Identify current voltage (VSNS) through compromise low energy loss and high signal-to-noise ratios selected.Drive the tolerance, migration and delay resulted in a relatively fixed error.To reduce the output current in a closed loop system must reduce VSNS.This will in turn reduce the precision of output current, in the end, the output current cannot be specified, control or guarantee.Generally speaking, relative to the analog dimming, PWM dimming can improve the precision of the linear control light output to the lower. About the company: E-Lite Semiconductor, Inc. is a veteran solid-state lighting company specializing in high quality, ultra-bright LED Lighting product design and manufacturing for commercial and industrial applications. As a leading innovator in high performance LED lighting technology, the company has extensive technical expertise in optical design, thermal management, materials compatibility and automated manufacturing processes. All of E-Lite’s LED lighting products are CE and RoHS compliant, UL/ETL certified, and DLC accredited for US and Canadian market. with more information , please visit our website www.elitesemicon.com



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