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| Two-Switch Electrolytic Capacitor-Less LED Driving Circuit Topology and Control Strategy |
| Lin Guoqing, Huang Yuanbin |
| Fujian Key Laboratory of New Energy Generation and Power Conversion Fuzhou University Fuzhou 350116 China |
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Abstract As the fourth generation lighting source, the Lighting Emitting Diode (LED) has gradually replaced conventional sources of light in various lighting fields due to its excellent qualities in luminous efficiency, service life, environmental protection, and production cost. Designing an LED driving power supply with a long service life, low device cost, high efficiency, and high reliability is urgent.
This paper proposes a two-switch electrolytic capacitor-less LED driving circuit topology, which integrates the auxiliary energy storage circuit into the flyback converter to suppress low-frequency ripples of the output current and remove the electrolytic capacitor in the LED driving power supply. This circuit only contains two switches and two diodes by sharing power switches and energy storage components, reducing circuit cost and improving the efficiency of the LED driving power supply. The auxiliary energy storage capacitor for balancing the input and output ripple power difference is isolated from the LED load. Thus, the energy storage capacitance can be reduced by increasing the energy storage capacitor’s average voltage or ripple value. The maximum capacitor value used in the entire LED driving power supply is reduced to 6.8uF, and the electrolytic capacitor is replaced by the film capacitor with smaller capacitance and longer life, which improves the service life and reliability of the LED driving power supply. Moreover, the auxiliary circuit without additional structures absorbs the voltage spike caused by the leakage inductance of its energy storage capacitor, reducing the voltage stress of the switch and enabling a wide AC input voltage range.
A control strategy for ripple suppression and minimum energy storage capacitor voltage is proposed. According to the relationship among the duty cycle of each switch, the auxiliary energy storage capacitor voltage, the output current, and the changing rules of the working duty cycle are obtained under the conditions that the two switches turn off at the same time when charging the auxiliary energy storage capacitor and turn on at the same time when discharging. The low-frequency ripple of the output current is suppressed by controlling the minimum value of the auxiliary energy storage capacitor voltage, and the efficiency of the LED driving power supply is further improved.
Based on the working principle of the circuit, the critical parameter design method is given, the selection principles of the energy storage capacitor value are determined, and the corresponding control strategy is proposed. Finally, a 35 W principle prototype is built. The results show that when the auxiliary energy storage capacitor and output filter capacitor are both 6.8 μF, the output current ripple of the prototype is less than 10% in the AC input voltage range of 90~264 V, the maximum efficiency reaches 87.8%, and the circuit power factors are higher than 0.95. The proposed circuit topology and control strategy achieve electrolytic capacitor-less, output current ripple suppression, high power factor, and wide AC input voltage range, which eliminates the impact of the electrolytic capacitor on the service life of the LED driving power supply.
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Received: 09 August 2023
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[1] 廖志凌, 阮新波. 半导体照明工程的现状与发展趋势[J]. 电工技术学报, 2006, 21(9): 106-111.
Liao Zhiling, Ruan Xinbo.Present status and developing trend of the semiconductor lighting[J]. Transactions of China Electrotechnical Society, 2006, 21(9): 106-111.
[2] Crawford M H.LEDs for solid-state lighting: per- formance challenges and recent advances[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2009, 15(4): 1028-1040.
[3] Lee S W, Do H L.A single-switch AC-DC LED driver based on a Boost-flyback PFC converter with lossless snubber[J]. IEEE Transactions on Power Electronics, 2017, 32(2): 1375-1384.
[4] 林通, 江平, 姚佳. 一种基于耦合电感的零电流纹波功率因数校正变换器[J]. 电工技术学报, 2022, 37(18): 4732-4744.
Lin Tong, Jiang Ping, Yao Jia.A zero current ripple tapped inductor power factor correction converter[J]. Transactions of China Electrotechnical Society, 2022, 37(18): 4732-4744.
[5] 孙凯, 贲洪奇, 孟涛, 等. 一种具有宽输出调压范围与低电压应力的单级无桥隔离型PFC变换器[J]. 电工技术学报, 2022, 37(8): 1991-2005.
Sun Kai, Ben Hongqi, Meng Tao, et al.A single-stage bridgeless isolated PFC converter with wide output voltage range and low voltage stress[J]. Transactions of China Electrotechnical Society, 2022, 37(8): 1991-2005.
[6] 王舒, 阮新波, 姚凯, 等. 无电解电容无频闪的LED驱动电源[J]. 电工技术学报, 2012, 27(4): 173-178.
Wang Shu, Ruan Xinbo, Yao Kai, et al.A novel LED driver without electrolytic capacitor and flicker[J]. Transactions of China Electrotechnical Society, 2012, 27(4): 173-178.
[7] Zhang Yiwen, Jin Ke.A single-stage electrolytic capacitor-less AC/DC LED driver[C]//2014 Inter- national Power Electronics and Application Con- ference and Exposition, Shanghai, China, 2015: 881-886.
[8] 曾君, 刘锋, 刘俊峰. 一种单极式多模态宽范围输入电压无电解电容LED驱动器[J]. 中国电机工程学报, 2020, 40(8): 2628-2638.
Zeng Jun, Liu Feng, Liu Junfeng.A single-stage flexible mode electrolytic capacitor-free LED driver over a wide range of input voltage[J]. Proceedings of the CSEE, 2020, 40(8): 2628-2638.
[9] 王立乔, 陈建医, 程超然, 等. 单级单相无电解电容Buck-Boost逆变器[J]. 电工技术学报, 2023, 38(24): 6768-6781.
Wang Liqiao, Li Zhanyi, Liu Le, et al.A single-stage Buck-Boost inverter with non-electrolytic capacitor[J]. Transactions of China Electrotechnical Society, 2019, 34(20): 4295-4305.
[10] 李中奇, 郭明乾, 朱晓楠, 等. 一种能量分配与能量回馈型的单级式无电解电容LED驱动器[J]. 中国电机工程学报, 2021, 41(24): 8600-8610.
Li Zhongqi, Guo Mingqian, Zhu Xiaonan, et al.A single stage electrolytic-capacitor-less LED driver based on energy channeling method and energy feedback method[J]. Proceedings of the CSEE, 2021, 41(24): 8600-8610.
[11] Abdelmessih G Z, Alonso J M, da S Spode N, et al. High-efficient electrolytic-capacitor-less offline LED driver with reduced power processing[J]. IEEE Transactions on Power Electronics, 2022, 37(2): 1804-1815
[12] Gu Linlin, Ruan Xinbo, Xu Ming, et al.Means of eliminating electrolytic capacitor in AC/DC power supplies for LED lightings[J]. IEEE Transactions on Power Electronics, 2009, 24(5): 1399-1408.
[13] Lamar D G, Sebastian J, Arias M, et al.On the limit of the output capacitor reduction in power-factor correctors by distorting the line input current[J]. IEEE Transactions on Power Electronics, 2012, 27(3): 1168-1176.
[14] 顾琳琳, 阮新波, 姚凯, 等. 采用谐波电流注入法减小储能电容容值[J]. 电工技术学报, 2010, 25(5): 142-148.
Gu Linlin, Ruan Xinbo, Yao Kai, et al.A harmonic current injection to reduce storage capacitance[J]. Transactions of China Electrotechnical Society, 2010, 25(5): 142-148.
[15] 倪建军, 张方华, 俞忆洁. 无电解电容的高功率因数AC-DC LED驱动器[J]. 电工技术学报, 2012, 27(12): 79-86, 93.
Ni Jianjun, Zhang Fanghua, Yu Yijie.High power factor AC-DC LED drivers without electrolytic capcitors[J]. Transactions of China Electrotechnical Society, 2012, 27(12): 79-86, 93.
[16] Hui S Y R, Li S N, Tao X H, et al. A novel passive off-line light-emitting diode (LED) driver with long lifetime[C]//2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Palm Springs, CA, USA, 2010: 594-600.
[17] Lam J C W, Jain P K. A high power factor, elec- trolytic capacitor-less AC-input LED driver topology with high frequency pulsating output current[J]. IEEE Transactions on Power Electronics, 2015, 30(2): 943-955.
[18] 杨洋, 阮新波, 叶志红. 无电解电容AC/DC LED驱动电源中减小输出电流脉动的前馈控制策略[J]. 中国电机工程学报, 2013, 33(21): 18-25.
Yang Yang, Ruan Xinbo, Ye Zhihong.A feed-forward scheme to reduce output current ripple of an electrolytic capacitor-less AC/DC LED driver[J]. Proceedings of the CSEE, 2013, 33(21): 18-25.
[19] Wang Shu, Ruan Xinbo, Yao Kai, et al.A flicker-free electrolytic capacitor-less AC-DC LED driver[J]. IEEE Transactions on Power Electronics, 2012, 27(11): 4540-4548.
[20] Camponogara D, Ferreira G F, Campos A, et al.Off-line LED driver for street lighting with an optimized cascade structure[C]//2012 IEEE Industry Applications Society Annual Meeting, Las Vegas, NV, USA, 2012: 1-6.
[21] 王立乔, 王海旭, 崔舒敏, 等. 串联型功率解耦型无电解电容PFC电路[J]. 中国电机工程学报, 2019, 39(17): 5195-5204, 5300.
Wang Liqiao, Wang Haixu, Cui Shumin, et al.A new series compensation control strategy of power factor corrector without electrolytic capacitor by power decoupling[J]. Proceedings of the CSEE, 2019, 39(17): 5195-5204, 5300.
[22] 汪飞, 李林, 钟元旭, 等. 反激式三端口无电解电容LED驱动电路拓扑[J]. 中国电机工程学报, 2017, 37(12): 3574-3582, 3686.
Wang Fei, Li Lin, Zhong Yuanxu, et al.Flyback- based three-port converters for electrolytic capacitor- less LED drivers[J]. Proceedings of the CSEE, 2017, 37(12): 3574-3582, 3686.
[23] Valipour H, Rezazadeh G, Zolghadri M R.Flicker- free electrolytic capacitor-less universal input offline LED driver with PFC[J]. IEEE Transactions on Power Electronics, 2016, 31(9): 6553-6561.
[24] 汪飞, 钟元旭, 阮毅. AC-DC LED驱动电源消除电解电容技术综述[J]. 电工技术学报, 2015, 30(8): 176-185.
Wang Fei, Zhong Yuanxu, Ruan Yi.A review of eliminating electrolytic capacitor in AC-DC light- emitting diode drivers[J]. Transactions of China Electrotechnical Society, 2015, 30(8): 176-185.
[25] 张艺文, 金科. 一种单级式高功率因数无电解电容AC/DC LED驱动电源略[J]. 中国电机工程学报, 2015, 35(22): 5851-5858.
Zhang Yiwen, Jin Ke.A single-stage electrolytic capacitor-less AC/DC LED driver with high input power factor[J]. Proceedings of the CSEE, 2015, 35(22): 5851-5858.
[26] Chen Wu, Ron Hui S Y. Elimination of an electrolytic capacitor in AC/DC light-emitting diode (LED) driver with high input power factor and constant output current[J]. IEEE Transactions on Power Electronics, 2012, 27(3): 1598-1607.
[27] Krein P T, Balog R S.Cost-effective hundred-year life for single-phase inverters and rectifiers in solar and LED lighting applications based on minimum capacitance requirements and a ripple power port[C]// 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition, Washington, DC, USA, 2009: 620-625.
[28] Shan Zhenyu, Chen Xiaomei, Jatskevich J, et al.AC-DC LED driver with an additional active rectifier and a unidirectional auxiliary circuit for AC power ripple isolation[J]. IEEE Transactions on Power Electronics, 2019, 34(1): 685-699. |
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2024, Vol. 39 
