基于可控开关电容的定频谐振式多路LED均流驱动器
|
摘要
多路LED并联可造成电流不均衡,利用电容阻抗匹配的均流方案因控制简单、易扩展而得到广泛应用,但伴随路数增加,均流效果锐减、无功损耗增大。同时,传统LED驱动常采用脉冲频率调制(PFM),从而造成高电磁干扰(EMI)的风险。基于此提出一种LED定频均流驱动拓扑,利用其上、下半桥叠加输出,缓解由容抗不匹配造成的均流失效及额外损耗,同时利用谐振单元中可控开关电容(SCC)模块完成定频控制下的LED大范围调光。LED驱动器中开关电路采用PWM,且均可实现软开关,转化效率高。设计12W的实验样机,实现四路LED均流调光,验证了所提LED驱动器的可行性。
The current sharing scheme of capacitive impedance matching has been widely used to eliminate current imbalance duo to simple control versus easy expansion.However,as the number of strings increases,the current sharing effect decreases,and the reactive loss increases.At the same time,traditional topologies using pulse frequency modulation(PFM) are bound to cause high electro magnetic interference(EMI).In this paper,a novel LED driver with the current sharing is proposed under constant frequency operation.The proposed converter can be derived by upper and lower half-bridge interleaved output,which greatly alleviates the unbalance of multiple LED and loss caused by capacitive mismatch.Meanwhile,LED wide range dimming with the constant frequency is achieved by using the switch-controlled capacitor(SCC) module of the resonant unit.Since the switching circuit adopts PWM and can realize soft-switching,the conversion efficiency of the machine is high.Finally,experimental prototype of 12 W was designed to realize 4-channel LED current-sharing dimming,which verified the feasibility of the LED driver.
The current sharing scheme of capacitive impedance matching has been widely used to eliminate current imbalance duo to simple control versus easy expansion.However,as the number of strings increases,the current sharing effect decreases,and the reactive loss increases.At the same time,traditional topologies using pulse frequency modulation(PFM) are bound to cause high electro magnetic interference(EMI).In this paper,a novel LED driver with the current sharing is proposed under constant frequency operation.The proposed converter can be derived by upper and lower half-bridge interleaved output,which greatly alleviates the unbalance of multiple LED and loss caused by capacitive mismatch.Meanwhile,LED wide range dimming with the constant frequency is achieved by using the switch-controlled capacitor(SCC) module of the resonant unit.Since the switching circuit adopts PWM and can realize soft-switching,the conversion efficiency of the machine is high.Finally,experimental prototype of 12 W was designed to realize 4-channel LED current-sharing dimming,which verified the feasibility of the LED driver.
引文
[1]Wang Yijie,Alonso J M,Ruan Xinbo.A review of LED drivers and related technologies[J].IEEETransactions on Industrial Electronics,2017,64(7):5754-5765.
[2]Liu Junfeng,Tian Hanlei,Liang Guozhuang,et al.Abridgeless electrolytic capacitor-free LED driver based on series-resonant converter with constant frequency control[J].IEEE Transactions on Power Electronics(Eaely Access),2018,DOI:10.1109/TPEL.2018.2847701.
[3]Wang Yijie,Guan Yueshi,Huang Jiaoping,et al.Asingle-stage LED driver based on interleaved Buck-Boost circuit and LLC resonant converter[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2015,3(3):732-741.
[4]Huang-Jen Chiu,Yu-Kang Lo,Jim-Ting Chen,et al.A high-efficiency dimmable LED driver for lowpower lighting applications[J].IEEE Transactions on Industrial Electronics,2010,57(2):735-743.
[5]张军明,谢小高,吴新科,等.DC/DC模块有源均流技术研究[J].中国电机工程学报,2005,25(19):31-36.Zhang Junming,Xie Xiaogao,Wu Xinke.Research on active current sharing methods for DC/DCconverters[J].Proceedings of the CSEE,2005,25(19):31-36.
[6]陈轶涵,任磊,邓翔,等.一种基于3次谐波注入的并联三相四桥臂逆变器均流控制策略[J].电工技术学报,2016,31(4):104-113.Chen Yihan,Ren Lei,Deng Xiang,et al.Current sharing control method for parallel three phase four leg inverter based on third harmonic injection[J].Transactions of China Electrotechnical Society,2016,31(4):104-113.
[7]Chen Xuebing,Huang Daocheng,Li Qiang,et al.Multichannel LED driver with CLL resonant converter[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2014,3(3):589-598.
[8]Zhang Junming,Wang Jianfeng,Wu Xinke.Acapacitor-isolated LED driver with inherent current balance capability[J].IEEE Transactions on Industrial Electronics,2012,59(4):1708-1716.
[9]陈为,王小博.一种具多路LED自动均流功能的反激式磁集成变换器[J].中国电机工程学报,2012,32(30):30-36.Chen Wei,Wang Xiaobo.A novel flyback converter with automatic current sharing for led-lighting systems dependent on integrated magnetic technique[J].Proceedings of the CSEE,2012,32(30):30-36.
[10]郝瑞祥,雷浩东,贺涛,等.一种具有自动均压均流特性的组合式LLC谐振变换器[J].电工技术学报,2016,31(20):151-160.Hao Ruixiang,Lei Haodong,He Tao,et al.Acombined LLC resonant converter with voltage and current auto-balance capability[J].Transactions of China Electrotechnical Society,2016,31(20):151-160.
[11]Wu Xinke,Hu Chen,Zhang Junming.Series-parallel autoregulated charge-balancing rectifier for multioutput light-emitting diode driver[J].IEEE Transactions on Industrial Electronics,2013,61(3):1262-1268.
[12]Wong C S,Loo K H,Lai Y M,et al.Accurate capacitive current balancing in multistring LEDlighting systems based on switched-capacitor-controlled LCC resonant network[J].IEEE Transactions on Power Electronics,2016,32(3):2167-2179.
[13]Chi S W,Loo K H,Iu H C,et al.Independent control of multicolour-multistring LED lighting systems with fully switched-capacitor-controlled LCC resonant network[J].IEEE Transactions on Power Electronics,2018,23(5):4293-4305.
[14]俞忆洁,张方华,倪建军.对称跨接电容型LED均流电路[J].电工技术学报,2014,29(8):196-203.Yu Yijie,Zhang Fanghua,Ni Jianjun.Symmetrical crossing capacitor current sharing circuit for multistring LEDs[J].Transactions of China Electrotechnical Society,2014,29(8):196-203.
[15]唐亚鹏,曲小慧,韩洪豆,等.基于LCLC恒流网络的LED自均流电路[J].中国电机工程学报,2016,36(2):516-523.Tang Yapeng,Qu Xiaohui,Han Hongdou,et al.Amulti-string LED driver with constant-current output and automatic balancing[J].Proceedings of the CSEE,2016,36(2):516-523.
[16]Martins M,Perdig?o M S,Mendes A M S,et al.Analysis,design,and experimentation of a dimmable resonant-switched-capacitor LED driver with variable inductor control[J].IEEE Transactions on Power Electronics,2017,32(4):3051-3062.
[17]曾君,孙伟华,刘俊峰.基于可控开关电容充放电平衡的多路LED驱动器[J].电工技术学报,2017,32(12):1-9.Zeng Jun,Sun Weihua,Liu Junfeng.Multi-channel LED driver based on charging and discharging balance of switch-controlled capacitor[J].Transactions of China Electrotechnical Society,2017,32(12):1-9.
[18]Gu W J,Harada K.A new method to regulate resonant converters[J].IEEE Transactions on Power Electronics,1988,3(4):430-439.
[19]Hu Zhiyuan,Qiu Yajie,Wang Laili,et al.An interleaved LLC resonant converter operating at constant switching frequency[J].IEEE Transactions on Power Electronics,2014,29(6):2931-2943.
[20]唐雄民,张淼,章云,等.一种具有自动均流特性的简易非隔离型多路LED串驱动电路[J].电工技术学报,2013,28(7):218-225.Tang Xiongmin,Zhang Miao,Zhang Yun,et al.Asimple non-isolated driver with inherent current balancing mechanism for multi-channel LEDstrings[J].Transactions of China Electrotechnical Society,2013,28(7):218-225.
[21]Martins M,Perdigao M S,Mendes A M S,et al.Analysis,design and experimentation of a dimmable resonant-switched-capacitor LED driver with variable inductor control[J].IEEE Transactions on Power Electronics,2017,32(4):3051-3062.
[22]Almeida P S,Soares G M,Pinto D P,et al.Integrated SEPIC Buck-Boost converter as an off-line LEDdriver without electrolytic capacitors[C]//IEEE International Conference on Industrial Electronics Society,Montreal,Canada,2012:4551-4556.
[23]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]Liu Junfeng,Tian Hanlei,Liang Guozhuang,et al.Abridgeless electrolytic capacitor-free LED driver based on series-resonant converter with constant frequency control[J].IEEE Transactions on Power Electronics(Eaely Access),2018,DOI:10.1109/TPEL.2018.2847701.
[3]Wang Yijie,Guan Yueshi,Huang Jiaoping,et al.Asingle-stage LED driver based on interleaved Buck-Boost circuit and LLC resonant converter[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2015,3(3):732-741.
[4]Huang-Jen Chiu,Yu-Kang Lo,Jim-Ting Chen,et al.A high-efficiency dimmable LED driver for lowpower lighting applications[J].IEEE Transactions on Industrial Electronics,2010,57(2):735-743.
[5]张军明,谢小高,吴新科,等.DC/DC模块有源均流技术研究[J].中国电机工程学报,2005,25(19):31-36.Zhang Junming,Xie Xiaogao,Wu Xinke.Research on active current sharing methods for DC/DCconverters[J].Proceedings of the CSEE,2005,25(19):31-36.
[6]陈轶涵,任磊,邓翔,等.一种基于3次谐波注入的并联三相四桥臂逆变器均流控制策略[J].电工技术学报,2016,31(4):104-113.Chen Yihan,Ren Lei,Deng Xiang,et al.Current sharing control method for parallel three phase four leg inverter based on third harmonic injection[J].Transactions of China Electrotechnical Society,2016,31(4):104-113.
[7]Chen Xuebing,Huang Daocheng,Li Qiang,et al.Multichannel LED driver with CLL resonant converter[J].IEEE Journal of Emerging&Selected Topics in Power Electronics,2014,3(3):589-598.
[8]Zhang Junming,Wang Jianfeng,Wu Xinke.Acapacitor-isolated LED driver with inherent current balance capability[J].IEEE Transactions on Industrial Electronics,2012,59(4):1708-1716.
[9]陈为,王小博.一种具多路LED自动均流功能的反激式磁集成变换器[J].中国电机工程学报,2012,32(30):30-36.Chen Wei,Wang Xiaobo.A novel flyback converter with automatic current sharing for led-lighting systems dependent on integrated magnetic technique[J].Proceedings of the CSEE,2012,32(30):30-36.
[10]郝瑞祥,雷浩东,贺涛,等.一种具有自动均压均流特性的组合式LLC谐振变换器[J].电工技术学报,2016,31(20):151-160.Hao Ruixiang,Lei Haodong,He Tao,et al.Acombined LLC resonant converter with voltage and current auto-balance capability[J].Transactions of China Electrotechnical Society,2016,31(20):151-160.
[11]Wu Xinke,Hu Chen,Zhang Junming.Series-parallel autoregulated charge-balancing rectifier for multioutput light-emitting diode driver[J].IEEE Transactions on Industrial Electronics,2013,61(3):1262-1268.
[12]Wong C S,Loo K H,Lai Y M,et al.Accurate capacitive current balancing in multistring LEDlighting systems based on switched-capacitor-controlled LCC resonant network[J].IEEE Transactions on Power Electronics,2016,32(3):2167-2179.
[13]Chi S W,Loo K H,Iu H C,et al.Independent control of multicolour-multistring LED lighting systems with fully switched-capacitor-controlled LCC resonant network[J].IEEE Transactions on Power Electronics,2018,23(5):4293-4305.
[14]俞忆洁,张方华,倪建军.对称跨接电容型LED均流电路[J].电工技术学报,2014,29(8):196-203.Yu Yijie,Zhang Fanghua,Ni Jianjun.Symmetrical crossing capacitor current sharing circuit for multistring LEDs[J].Transactions of China Electrotechnical Society,2014,29(8):196-203.
[15]唐亚鹏,曲小慧,韩洪豆,等.基于LCLC恒流网络的LED自均流电路[J].中国电机工程学报,2016,36(2):516-523.Tang Yapeng,Qu Xiaohui,Han Hongdou,et al.Amulti-string LED driver with constant-current output and automatic balancing[J].Proceedings of the CSEE,2016,36(2):516-523.
[16]Martins M,Perdig?o M S,Mendes A M S,et al.Analysis,design,and experimentation of a dimmable resonant-switched-capacitor LED driver with variable inductor control[J].IEEE Transactions on Power Electronics,2017,32(4):3051-3062.
[17]曾君,孙伟华,刘俊峰.基于可控开关电容充放电平衡的多路LED驱动器[J].电工技术学报,2017,32(12):1-9.Zeng Jun,Sun Weihua,Liu Junfeng.Multi-channel LED driver based on charging and discharging balance of switch-controlled capacitor[J].Transactions of China Electrotechnical Society,2017,32(12):1-9.
[18]Gu W J,Harada K.A new method to regulate resonant converters[J].IEEE Transactions on Power Electronics,1988,3(4):430-439.
[19]Hu Zhiyuan,Qiu Yajie,Wang Laili,et al.An interleaved LLC resonant converter operating at constant switching frequency[J].IEEE Transactions on Power Electronics,2014,29(6):2931-2943.
[20]唐雄民,张淼,章云,等.一种具有自动均流特性的简易非隔离型多路LED串驱动电路[J].电工技术学报,2013,28(7):218-225.Tang Xiongmin,Zhang Miao,Zhang Yun,et al.Asimple non-isolated driver with inherent current balancing mechanism for multi-channel LEDstrings[J].Transactions of China Electrotechnical Society,2013,28(7):218-225.
[21]Martins M,Perdigao M S,Mendes A M S,et al.Analysis,design and experimentation of a dimmable resonant-switched-capacitor LED driver with variable inductor control[J].IEEE Transactions on Power Electronics,2017,32(4):3051-3062.
[22]Almeida P S,Soares G M,Pinto D P,et al.Integrated SEPIC Buck-Boost converter as an off-line LEDdriver without electrolytic capacitors[C]//IEEE International Conference on Industrial Electronics Society,Montreal,Canada,2012:4551-4556.
[23]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.