二次型Boost变换器工作模式及输出电压纹波分析

发布时间：2018-04-12 23:39

本文选题：二次型Boost变换器 + 临界电感值　；参考：《电工技术学报》2014年08期

【摘要】：根据二次型Boost变换器输入电感和储能电感的工作模式,划分了二次型Boost变换器的工作模式区域,并分析了不同能量传输模式时输出电压的纹波特性。根据储能电感电流谷值与输出电流的关系,分析了二次型Boost变换器在开关管关断期间的能量传输模式:完全电感供能模式(CISM)和不完全电感供能模式(IISM),得出了CISM与IISM的临界电感值和临界工作条件。当储能电感工作于连续导电模式(CCM)时,二次型Boost变换器既可以工作于CISM,也可以工作于IISM;当储能电感工作于不连续导电模式(DCM)时,二次型Boost变换器只能工作于IISM。对于给定输入电感、负载、电容和开关频率的二次型Boost变换器,当储能电感工作于CCM-CISM模式时,输出电压纹波最小,输出电压纹波仅由开关管导通期间输出电容电压的下降幅度决定,与储能电感无关;而当储能电感工作于DCM-IISM模式时,输出电压纹波最大,输出电压纹波随着储能电感的减小而增大。最后,通过试验装置验证了理论分析的正确性。
[Abstract]:According to the operating modes of input inductors and energy storage inductors of quadratic Boost converters, the operating mode regions of quadratic Boost converters are divided, and the ripple characteristics of output voltages in different energy transmission modes are analyzed.According to the relation between the current valley value of the energy storage inductor and the output current,The energy transfer modes of the secondary Boost converter during switching off are analyzed, which are the full inductance energy supply mode and the incomplete inductance energy supply mode. The critical inductance values and critical operating conditions of CISM and IISM are obtained.When the energy storage inductor works in the continuous conduction mode, the secondary Boost converter can work both at CISM and the IISM, and when the energy storage inductor works in the discontinuous conductive mode, the secondary Boost converter can only work on the IISM.For a quadratic Boost converter with a given input inductor, load, capacitance and switching frequency, the output voltage ripple is minimum when the energy storage inductor works in CCM-CISM mode.The output voltage ripple is determined only by the drop of the output capacitor voltage during the switching on period, and has nothing to do with the energy storage inductor, but when the energy storage inductor works in DCM-IISM mode, the output voltage ripple is the largest.The output voltage ripple increases with the decrease of the energy storage inductance.Finally, the correctness of the theoretical analysis is verified by the experimental device.
【作者单位】：西南交通大学电气工程学院;
【基金】：国家自然科学基金(51177140,61371033) 四川省青年科技基金(2013JQ0033)资助项目
【分类号】：TM46

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