一种新型单开关直流高增益变换器

发布时间：2018-08-13 08:47

【摘要】：针对传统Boost电路电压增益有限及变压器、耦合电感等升压电路存在漏感的问题,提出一种无变压器、无耦合电感的新型单开关高增益变换器,将2个电压升举单元引入Boost拓扑,提高了电压增益且降低了开关管、二极管电压应力,同时在电压升举单元中加入小电感,在不影响效率的情况下,抑制开关管开通瞬间的尖峰电流。详细分析了新型变换器在一个开关周期内不同模态下的工作状况,建立了系统的直流稳态模型,给出变换器的电压增益比及功率器件的电压应力。仿真和实验结果表明,当开关管占空比为65%时,电压增益约为14.88,且开关管与二极管在同等输出电压情况下,其电压应力小于传统Boost。该变换器输出电压高,输入电流纹波小,开关管电压电流应力低,且电感电流一直处于连续模式。
[Abstract]:Aiming at the problem of leakage inductance in traditional Boost circuit with limited voltage gain and transformer and coupling inductance, a new type of single-switch high-gain converter without transformer and coupling inductance is proposed. Two voltage lift units are introduced into Boost topology. The voltage gain is increased and the voltage stress of the switch tube and diode is reduced. At the same time, the small inductance is added to the voltage lift unit, which can restrain the peak current of the switch tube at the moment of switching on without affecting the efficiency. The operating conditions of the new converter in different modes during a switching cycle are analyzed in detail. The DC steady-state model of the system is established. The voltage gain ratio of the converter and the voltage stress of the power device are given. The simulation and experimental results show that the voltage gain is about 14.88 when the duty cycle is 65, and the voltage stress of the switch is smaller than that of the conventional boost at the same output voltage as the diode. The output voltage of the converter is high, the ripple of input current is small, the voltage and current stress of switch tube is low, and the inductance current is in continuous mode all the time.
【作者单位】：中国矿业大学电气与动力工程学院;
【基金】：江苏省“六大人才高峰”高层次人才资助项目(ZNDW-004)~~
【分类号】：TM46

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