| 引用本文: | 郑连清,王学亮,李 鹍,丁茂桃.脉冲移位PWM控制ZCS电流型半桥变换器[J].电力自动化设备,2011,31(4): |
| ZHENG Lianqing,WANG Xueliang,LI Kun,DING Maotao.ZCS current-fed half-bridge DC／DC converter with duty-cycle-shifted symmetrical PWM control[J].Electric Power Automation Equipment,2011,31(4): |
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| 摘要: |
| 提出一种改进的电流型零电流半桥电路拓扑。与传统的电流型半桥电路相比，该拓扑电路增加了一个由辅助开关管、二极管以及电容组成的辅助支路，采用脉冲移位PWM控制方法，避免了直流偏磁的产生，使开关占空比在一定范围内可调的情况下实现主功率开关管和辅助开关管的零电流开关（ZCS），同时实现了整流二极管的软换流，使得整流二极管反向电压等于输出电压。在分析该变换器的工作原理基础上，研究了其工作特性，进行了对主开关管实现ZCS条件的讨论和对电流占空比丢失的分析，并且基于Saber仿真软件对该电路进行了仿真验证。结果验证了电路分析的正确性和设计的可行性。 |
| 关键词: 直流变换器 电流型半桥 零电流开关 脉冲移位PWM控制 |
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| ZCS current-fed half-bridge DC／DC converter with duty-cycle-shifted symmetrical PWM control |
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ZHENG Lianqing, WANG Xueliang, LI Kun, DING Maotao
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State Key Laboratory of Power Transmission Equipment & System Security and New Technology，Chongqing University，Chongqing 400044，China
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| Abstract: |
| An improved ZCS（Zero Current Switching） current-fed half-bridge DC／DC converter is presented. Compared with conventional current-fed half-bridge topology，an auxiliary branch consisting of an auxiliary switch，a diode and a capacitor is added. The duty-cycle-shifted symmetrical PWM control is applied to avoid magnetic bias；the adjustable duty-cycle to realize the ZCS of main and auxiliary switches；and the soft commutation of rectifier diode to make its reverse voltage equal to output voltage. Its operational principle is illustrated. The conditions to realize ZCS and the loss of duty cycle are analyzed. Simulations with Saber indicate the correctness of circuit analysis and the feasibility of design. |
| Key words: DC／DC converter current-fed half-bridge ZCS duty-cycle-shifted symmetrical PWM control |
