基于能量信息协同调控的LED智能调光技术

LED Intelligent Dimming Strategy with Power and Signal Dual Modulation

针对当前LED照明系统对智能化的迫切需求和对成本的高度敏感,而现有智能化调控方案在成本和可靠性等方面存在不足等问题,提出一种基于电力电子变换器能量信息协同调控的LED智能调光技术。该技术基于电力电子变换器驱动的LED线性调光照明系统,采用四进制差分相移键控(Quaternary differential phase shift keying,QDPSK)对公共直流母线上的开关纹波进行信息调制,从而在不额外增加硬件成本的条件下,实现四进制数字信号的调制、耦合与传输。从通信视角解构了DC/DC变换器的基本工作原理,揭示了LED调光系统中能量信息协同调控的实现方法,并以隧道LED照明系统的智能调光为例,围绕系统结构、通信协议、噪声干扰、通信速率等方面展开了具体分析。最后,搭建试验平台验证了所提方法的可行性。

With the urgent demand to intelligence and the highly sensibility to cost for LED lighting systems,and the existing intelligent LED control strategies face the issues of high cost and low reliability,a power electronic converter-based power and signal dual modulation method is proposed for LED intelligent dimming.It is based on power electronics-driven LED linear dimming system,adopting quaternary differential phase shift keying(QDPSK)to modulate ripples on the common power bus.Therefore,quaternary signal modulation,coupling and transmission are achieved without extra hardware.The basic principle of DC/DC power converter is studied from communication perspective,and reveals the implementation method of power and signal dual modulation in LED dimming systems.A tunnel LED intelligent dimming system is analyzed as an example from perspectives of the system structure,communication protocols,power noises,and communication rate.Finally,an experimental prototype is constructed to verify the feasibility of the proposed method.