Dimming Method for R/G/B/WW Light Emitting Diode Based on Four Channels’ Pulse Width Modulation

Huijuan Tian; Jianxin Liu; Zhen Hong; Hui Zhang

doi:10.3788/AOS201838.0423002

Acta Optica Sinica, Volume. 38, Issue 4, 0423002(2018)

Dimming Method for R/G/B/WW Light Emitting Diode Based on Four Channels’ Pulse Width Modulation

Huijuan Tian^1,2、*, Jianxin Liu^2,3, Zhen Hong^2,3, and Hui Zhang^1,2

¹ Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology, School of Electrical Engineering and Automation, Tianjin Polytechnic University, Tianjin 300387, China

² Engineering Research Center of Ministry of Education on High Power Solid State Lighting Application System, Tianjin 300387, China

³ School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China

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Figures & Tables(7)

Fig. 1. Relative spectral power distribution of R/G/B/WW LED sources

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Fig. 2. Schematic graph of driving circuit of R/G/B/WW LED source module

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Fig. 3. Testing system of R/G/B/WW LED source module

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Fig. 4. Lighting effect photos of R/G/B/WW LED module. (a) VCCT=3000 K; (b) VCCT=5000 K; (c) VCCT=7000 K

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Table 1. Parameters of R/G/B/WW LED module in the experiment
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Table 1. Parameters of R/G/B/WW LED module in the experiment
x y Luminous flux /lm Peak wavelength /nm Power /W
Red LED 0.6831 0.3114 186.42 631 4.02
Green LED 0.1868 0.6971 291.36 522 3.69
Blue LED 0.1501 0.0311 57.103 451 3.28
WW LED 0.4314 0.4082 613.58 V_CCT/K CRI 6.14
3132 83.5

Table 2. Contrast between the set and measured values at luminous flux ф=300 lm

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Table 2. Contrast between the set and measured values at luminous flux ф=300 lm

Set CCT /K	Measured CCT /K	Relative error of CCT /%	Measured luminous flux ф /lm	Relative error of luminous flux ф/%	Set CRI	Measured CRI	Relative error of CRI /%
2900	2890	0.34	303.40	1.13	96.1	96.0	0.10
3200	3213	0.41	302.73	0.91	96.0	96.0	0.00
3600	3605	0.14	300.86	0.29	96.1	96.0	0.10
4000	3977	0.58	299.23	0.26	96.1	96.0	0.10
4400	4366	0.77	297.84	0.72	96.0	95.9	0.10
4800	4757	0.90	297.86	0.71	95.9	95.9	0.00
5200	5191	0.17	295.62	1.46	94.8	94.7	0.11
5600	5552	0.86	295.75	1.42	94.7	94.6	0.11
6000	5956	0.73	294.49	1.84	94.6	94.5	0.11
6400	6349	0.80	295.20	1.60	94.4	94.4	0.00
6800	6733	0.99	294.10	1.97	94.3	94.3	0.00
7200	7162	0.53	293.69	2.10	94.3	94.2	0.11
7600	7591	0.12	293.28	2.24	94.2	94.1	0.11

Table 3. Contrast between the set and measured values at VCCT=5000 K

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Table 3. Contrast between the set and measured values at VCCT=5000 K

Measured CCT /K	Relative error of CCT /%	Set luminous flux ф /lm	Measured luminous flux ф /lm	Relative error of luminous flux ф /%	Measured CRI
5098	1.96	150	152.95	1.97	94.6
5010	0.20	200	200.35	0.17	94.6
4989	0.22	250	247.77	0.89	95.7
4952	0.96	300	295.84	1.39	95.7
4922	1.56	350	344.26	1.64	95.8
4922	1.56	400	391.93	2.02	95.8
4905	1.90	450	442.06	1.76	95.8
4908	1.84	500	490.03	1.99	95.8
4893	2.14	550	540.98	1.64	95.9
4867	2.66	600	591.28	1.45	95.9
4867	2.66	650	642.41	1.17	95.9
4867	2.66	700	692.00	1.14	95.9
4853	2.94	750	742.05	1.06	96.0
4863	2.74	800	791.58	1.05	96.0
4956	0.88	850	810.09	4.70	96.0
5070	1.40	851	824.18	3.15	95.0
5098	2.94	851	824.18	4.70	96.0

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Huijuan Tian, Jianxin Liu, Zhen Hong, Hui Zhang. Dimming Method for R/G/B/WW Light Emitting Diode Based on Four Channels’ Pulse Width Modulation[J]. Acta Optica Sinica, 2018, 38(4): 0423002

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