级联式DC-DC隔离变换器的研究
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摘要
Buck三电平变换器与正激级变换器级联构成的级联式DC-DC变换器,该拓扑电路结构具有输出整流电压受输入电压波动影响小的特点,因此适用于宽输入电压波动范围大的场合。该拓扑电路利用中间二极管实现了对正激级高频变压器磁通复位;通过分析该电路周期内的工作过程并试制了一台450-750 V输入,多路输出的样机,并给出了当输入电压520V时实验相关波形。采用该拓扑结构,节省铜材料,减小变压器体积,动态特性好。
The cascaded DC-DC converter composed of Buck three-level converter and forward converter,has the characteristic with a small influence on the output rectifier voltage, so it is very suitable for wide input voltage fluctuation range. The flux reset of forward high frequency transformer is realized by using intermediate diode in the circuit. The process of the circuit working period of a prototype of 450-750 V input and multiple output is analyzed. The experimental waveforms are introduced at input voltage of 520 V. It is showed that copper saving, volume reduction and better dynamic characteristics are reached with the cascade topology.
The cascaded DC-DC converter composed of Buck three-level converter and forward converter,has the characteristic with a small influence on the output rectifier voltage, so it is very suitable for wide input voltage fluctuation range. The flux reset of forward high frequency transformer is realized by using intermediate diode in the circuit. The process of the circuit working period of a prototype of 450-750 V input and multiple output is analyzed. The experimental waveforms are introduced at input voltage of 520 V. It is showed that copper saving, volume reduction and better dynamic characteristics are reached with the cascade topology.
引文
[1]张占松,蔡宣三.开关电源的原理与设计(修订版).北京:电子工业出版社, 2004.
[2]黄剑峰,马皓. Buck与推挽级联式DC/DC变换器的研究.电力电子技术, 2008, 42(6):30-32.
[3]任小永,阮新波.适用于高压输入低压输出的两级式变换器.中国电机工程学报, 2005, 25(23):153-157.
[4]阮新波.三电平直流变换器及其软开关技术.北京:科学出版社, 2006:41-46, 81-88.
[5]钟小芬,吴捷.基于SG3525电压调节芯片的PWM Buck三电平变换器.电源应用技术,2004,7(7):411-415.
[2]黄剑峰,马皓. Buck与推挽级联式DC/DC变换器的研究.电力电子技术, 2008, 42(6):30-32.
[3]任小永,阮新波.适用于高压输入低压输出的两级式变换器.中国电机工程学报, 2005, 25(23):153-157.
[4]阮新波.三电平直流变换器及其软开关技术.北京:科学出版社, 2006:41-46, 81-88.
[5]钟小芬,吴捷.基于SG3525电压调节芯片的PWM Buck三电平变换器.电源应用技术,2004,7(7):411-415.