| 引用本文: | 邾玢鑫,程 杉,谭 超.ZVS隔离型高增益DC／DC变换器[J].电力自动化设备,2015,35(5): |
| ZHU Binxin,CHENG Shan,TAN Chao.ZVS isolated high step-up DC／DC converter[J].Electric Power Automation Equipment,2015,35(5): |
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| 摘要: |
| 将传统的L型电流输入隔离型DC／DC变换器与一种DCM（Diode-Capacitor Multiplier）电压增益单元相结合，提出了一种新型ZVS隔离型高增益DC／DC变换器。在继承传统L型电流输入隔离型DC／DC变换器输入电流纹波小、变压器匝数比低等优点的基础上，所提变换器可通过调节DCM增益单元数来调节变换器的输入输出增益比；通过有源箝位电路和漏感的结合，开关均实现了零电压开通，二极管均实现了零电流关断，二极管的反向恢复损耗得到了抑制；借助于所提DCM增益单元，二极管的电压应力以及变压器的绝缘等级得到了有效降低；所有二极管的电压、电流应力均相等，便于散热设计。对变换器的工作原理和性能特点进行了理论分析，并建立了一台输入24 V、输出400 V、功率为200 W的实验样机。实验测试样机最高效率可达95%，验证了理论分析的有效性和正确性。 |
| 关键词: 变换器 电流输入 隔离 高增益 DCM ZVS |
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| 基金项目:国家自然科学基金资助项目（51407104）；三峡大学科学基金资助项目（KJ2014B010） |
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| ZVS isolated high step-up DC／DC converter |
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ZHU Binxin, CHENG Shan, TAN Chao
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School of Electrical Engineering and Renewable Energy，China Three Gorges University，Yichang 443002，China
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| Abstract: |
| A ZVS isolated high step-up DC／DC converter is proposed，which combines L-type current-fed isolated DC／DC converter with DCM（Diode-Capacitor Multiplier） cells. The advantages of L-type converter are inherited，such as smaller input current ripple，lower transformer turn-ratio，etc.；the step-up conversion ratio can be easily adjusted by changing the number of DCM cells；all switches are turned on at zero-voltage，all diodes are turned off with zero-current and the diode reverse-recovery loss is suppressed by combining the active clamp circuit with the inductance leakage；the voltage stress of diode and the insulation class of transformer are lowered due to the DCM cells；all diodes have the same current and voltage stresses to simplify the thermal design. The working principle and performance of the proposed converter are theoretically analyzed and a prototype of 24 V input voltage，400 V output voltage and 200 W output power is established. The highest efficiency of the prototype reaches 95 %，verifying the effectiveness and correctness of the theoretical analysis. |
| Key words: electric converters current-fed isolation high step-up DCM ZVS |
