| 引用本文: | 刘和平,李金龙,苗轶如,彭东林,周 群,何莹莹,许建平,张 斐.无传感器混合式LLC电路同步整流数字控制策略[J].电力自动化设备,2015,35(1): |
| LIU Heping,LI Jinlong,MIAO Yiru,PENG Donglin,ZHOU Qun,HE Yingying,XU Jianping,ZHANG Fei.Digital synchronous rectification control of sensorless hybrid LLC circuit[J].Electric Power Automation Equipment,2015,35(1): |
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| 无传感器混合式LLC电路同步整流数字控制策略 |
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刘和平1, 李金龙2, 苗轶如3, 彭东林4, 周 群5, 何莹莹6, 许建平6, 张 斐6
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1.重庆大学 输配电装备及系统安全与新技术国家重点实验室，重庆 400044;2.重庆大学 输配电装备及系统安全与新技术国家重点实验室，重庆 400045;3.重庆大学 输配电装备及系统安全与新技术国家重点实验室，重庆 400046;4.重庆理工大学 机械检测技术与装备教育部工程研究中心，重庆 400054;5.四川大学 电气信息学院，四川 成都 610065;6.西南交通大学 电气工程学院 磁浮技术与磁浮列车教育部重点实验室，四川 成都 610031
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| 摘要: |
| 详细分析了混合式LLC电路移相模式下的开关损耗，以损耗最小为依据确定了混合控制的最优转换点。根据混合式LLC电路整流电流为近似正弦断续的特点，提出一种与LLC谐振控制共享电压检测且无需额外传感器的同步整流控制策略。该策略采用最优梯度滞环比较算法，可较好实现混合式LLC电路同步整流的数字控制，具有良好的调节速度和精确度。以一个36 ～ 72 V输入、3.3 V／20 A输出的实验样机验证了所提理论的正确性和可行性。 |
| 关键词: 同步整流 无传感器 LLC电路 混合控制 最优控制 数字控制 谐振 |
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| 基金项目:基金项目：国家自然科学基金资助项目（51127001） |
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| Digital synchronous rectification control of sensorless hybrid LLC circuit |
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LIU Heping,LI Jinlong,MIAO Yiru,PENG Donglin,ZHOU Qun,HE Yingying,XU Jianping,ZHANG Fei
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1.State Key Laboratory of Power Transmission Equipment & Power System Security and New Technology，Chongqing University，Chongqing 400044，China;2.Engineering Research Center of Mechanical Testing Technology and Equipment of Ministry of Education，Chongqing University of Technology，Chongqing 400054，China;3.School of Electrical Engineering and Information，Sichuan University，Chengdu 610065，China;4.Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle，Ministry of Education，School of Electrical Engineering，Southwest Jiaotong University，Chengdu 610031，China
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| Abstract: |
| The switching loss of hybrid LLC circuit in phase-shift mode is analyzed and the optimal converting point of hybrid control is determined according to the minimum loss. As the rectifying current of the LLC circuit is approximately sinusoidal and intermittent，a strategy of synchronous rectification control is proposed，which shares the voltage detection with the LLC resonant control and does not need additional sensors. It adopts the optimal gradient hysteresis comparison algorithm to realize the digital synchronous rectification control of LLC circuit，with better regulation speed and accuracy. An experiment with a prototype of 36~72 V input and 3.3 V／20 A output verifies the correctness and feasibility of the proposed theory. |
| Key words: synchronous rectification sensorless LLC circuit hybrid control optimal control digital control resonance |
