Abstract：Due to the leakage inductance of the transformer, voltage spikes exist across the bridge arm in single-stage full-bridge PFC converter. It seriously affects the normal operation of the converter. To solve this problem, the forming mechanism of voltage spikes across bridge arm and the principle of active clamp circuit absorbing voltage spikes are analyzed. Accordingly, the forming mechanism of drain-source voltage spikes of clamp switch is analyzed, and the method that upper switches of bridge arms are operating in ZVS mode is hence proposed. Regarding the voltage spikes across bridge arm cannot be absorbed during input current zero crossing stage, the method of keeping clamp switch off is this stage is proposed. To avoid the inrush current of clamp switch during input current zero crossing, an improved active clamp circuit is proposed. The analysis and the proposed methods are verified by the simulation and experimental results.
[1] 胡玮, 康勇, 周小宁, 等. 一种零电压转换双升压有源功率因数校正变换器[J]. 电工技术学报, 2014, 29(10): 113-121. Hu Wei, Kang Yong, Zhou Xiaoning, et al.A zero- voltage transition dual Boost power factor correction converter[J]. Transactions of China Electrotechnical Society, 2014, 29(10): 113-121. [2] 杨俊伟, 史旺旺. 交流电流直接控制的单相PWM整流器非线性控制策略[J]. 电力系统保护与控制, 2015, 43(20): 114-118. Yang Junwei, Shi Wangwang.Nonlinear control strategy for direct AC current control in single-phase PWM rectifier[J]. Power System Protection and Control, 2015, 43(20): 114-118. [3] 陈裕成. 双Boost PFC变换器输出电压纹波的研究[J]. 电气技术, 2015, 16(6): 48-51. Chen Yucheng.Research on output voltage ripple of doubler Boost PFC[J]. Electrical Engineering, 2015, 16(6): 48-51. [4] 韦徵, 陈新, 陈杰, 等. 三相PFC整流器改进的单周期控制策略[J]. 电工技术学报, 2014, 29(6): 196-203. Wei Zheng, Chen Xin, Chen Jie, et al.Research of improved one-cycle control strategy of three-phase PFC rectifier[J]. Transactions of China Electro- technical Society, 2014, 29(6): 196-203. [5] 侯兆然. 基于虚拟磁链定向的PWM整流器控制方法研究[J]. 电力系统保护与控制, 2014, 42(21): 105-109. Hou Zhaoran.Research on control method of PWM rectifier based on virtual flux orientation[J]. Power System Protection and Control, 2014, 42(21): 105-109. [6] 周群, 董政, 杨平, 等. 具有快动态响应和低输出电压纹波次型Boost PFC变换器[J]. 电工技术学报, 2015, 30(10): 249-257. Zhou Qun, Dong Zheng, Yang Ping, et al.Quadratic Boost PFC converter with fast dynamic response and low output voltage ripple[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 249-257. [7] 贲洪奇, 王大庆, 孟涛, 等. 基于辅助绕组的单级桥式PFC变换器纹波抑制策略[J]. 电工技术学报, 2013, 28(4): 58-64. Ben Hongqi, Wang Daqing, Meng Tao, et al.Output voltage ripple suppression scheme of single-stage full-bridge PFC converter basic on auxiliary winding[J]. Transactions of China Electrotechnical Sosiety, 2013, 28(4): 58-64. [8] Duarte J, Lima L R, Oliveira L, et al.Single-stage high power factor step-up/step-down isolated AC/DC converter[J]. IET Power Electronics, 2012, 5(8): 1351-1358. [9] Meng T, Ben H, Wang X.A passive flyback auxiliary circuit with integrated transformer suitable for three- phase isolated full-bridge Boost PFC converter[J]. IEEE Transactions on Power Electronics, 2016, 31(7): 4995-5003. [10] Hang L J, Liu X W, Lu Z Y, et al.Investigation of key technique for high efficiency and high power density single-stage power factor correction AC/DC converter[C]//IEEE Power Electronics Specialists Conference, Orlando, FL, 2007: 2912-2917. [11] Zhu L.A novel soft-commutating isolated Boost full- bridge ZVS-PWM DC/DC converter for bidirectional high power applications[J]. IEEE Transactions on Power Electronics, 2006, 21(2): 422-429. [12] Mousavi A, Das P.A comparative study of a new ZCS DC/DC full-bridge Boost converter with a ZVS active-clamp converter[J]. IEEE Transactions on Power Electronics, 2012, 27(3): 1347-1358. [13] Trong N Q, Chiu H J, Lo Y K, et al.Modified current-fed full-bridge isolated power factor correction converter with low-voltage stress[J]. IET Power Elec- tronics, 2014, 7(4): 861-867. [14] Meng T, Ben H, Zhu L, et al.Improved passive snubbers suitable for single-phase isolated full-bridge boost power factor correction converter[J]. IET Power Electronics, 2014, 7(2): 279-288. [15] Watson R, Lee F C.A soft-switched, full-bridge boost converter employing an active-clamp circuit[C]//IEEE Power Electronics Specialists Conference, Baveno, 1996: 1948-1954. [16] Ahmed O A, Bleijs J.Optimized active-clamp circuit design for an isolated full-bridge current-fed DC-DC converter[C]//4th International Conference on Power Electronics Systems and Applications, Hong Kong, 2011: 1-7. [17] Prasanna U R, Rathore A K.New modulation technique for hybrid softswitching and low duty ratio operation of active-clamped current-fed full-bridge isolated DC/DC converter[C]//IEEE International Conference on Power Electronics, Bengaluru, 2012: 1-6. [18] 贲洪奇, 金祖敏. 一种新型零电流零电压开关功率因数校正全桥变换器[J]. 中国电机工程学报, 2004, 24(6): 162-166. Ben Hongqi, Jin Zumin.A novel zero-current and zero-voltage-switching full-bridge converter with power factor correction[J]. Proceedings of the CSEE, 2004, 24(6): 162-166. [19] Mousavi A, Das P.ZVS and ZCS DC-DC PWM full-bridge fuel cell converters[C]//Applied Power Electronics Conference and Exposition (APEC), Palm Springs, CA, 2010: 564-570. [20] Anurag A, Bal S, Chitti Babu B.A detailed comparative analysis between two soft switching techniques used in PV applications[C]//2012 Annual IEEE India Conference (INDICON), Kochi, 2012: 1234-1239.
2018, Vol. 33 
