LED Intelligent Dimming Strategy with Power and Signal Dual Modulation

doi:10.11985/2024.01.021

Abstract

Abstract:

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.

Key words: LED intelligent dimming, power and signal dual modulation, QDPSK modulation, DC/DC converter

CLC Number:

TM46

SHANG Wenyang, WANG Ruichi, LIN Zhengyu, WU Jiande, HE Xiangning. LED Intelligent Dimming Strategy with Power and Signal Dual Modulation[J]. Journal of Electrical Engineering, 2024, 19(1): 196-205.

Figures/Tables 17

References 42

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前一符号状态			此刻到达的码元			当前符号状态
${{\varphi }_{n-1}}$/(°)	${{c}_{n-1}}$	${{d}_{n-1}}$	${{a}_{n}}$	${{b}_{n}}$	$\Delta {{\varphi }_{n}}$/(°)	${{\varphi }_{n}}$/(°)	${{c}_{n}}$	${{d}_{n}}$
315	0 0		0 0		90	45	0 1
			0 1		0	315	0 0
			1 1		270	225	1 0
			1 0		180	135	1 1
45	0 1		0 0		90	135	1 1
			0 1		0	45	0 1
			1 1		270	315	0 0
			1 0		180	225	1 0
135	1 1		0 0		90	225	1 0
			0 1		0	135	1 1
			1 1		270	45	0 1
			1 0		180	315	0 0
225	1 0		0 0		90	315	0 0
			0 1		0	225	1 0
			1 1		270	135	1 1
			1 0		180	45	0 1

前一载波/(°)	当前载波/(°)
前一载波/(°)	45	135	225	315
45	0	1	1	0
135	1	0	0	1
225	1	0	0	1
315	0	1	1	0

参数	数值
输入电压/V	24
输出电压/V	48
满载功率/W	50
开关频率f₀(非通信)/kHz	62.5
开关频率f₁(通信)/kHz	50
码元周期/μs	160
信号传输距离/m	2
通信速率/kbps	12.5
控制器	TI TMS320F28035
接收端采样窗口长度/μs	160
接收端采样频率/kHz	500