Improved small-signal analysis for the phase-shifted PWM power converter
Improved small-signal analysis for the phase-shifted PWM power converter
复制标题
改进了相移 PWM 功率转换器的小信号分析
DOI：
10.1109/tpel.2003.809539
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发表时间：
2003
影响因子：
6.7
通讯作者：
D. Torrey
中科院分区：
文献类型：
--
作者：
M. Schutten;D. Torrey
基于闭环逐周期分析法建立了一种新的零电压开关（ZVS）移相PWM（PSPWM）全桥功率变换器小信号模型。本文推导了小信号响应方程。PSPWM转换器有一个隐含的“压摆间隔”，使得转换器动态特性难以使用传统的平均技术进行分析。在连续导通模式操作下并且使用电压模式控制的转换器控制到输出传递函数不呈现与输出L-C滤波器相关联的二阶极点，使得其不同于常规PWM转换器。该模型将输出L-C滤波器分解为两个真实的极点，其中一个极点保持在与工作条件无关的恒定频率。特征极点仅取决于转换器开关频率和电感值。该特征极点对于理解PSPWM转换器的自然和强制响应至关重要。新的小信号模型被证明是在良好的协议与实验结果。
A closed form cycle by cycle analysis forms the basis for a new zero-voltage switching (ZVS) phase-shifted PWM (PSPWM) full bridge power converter small-signal model. The paper derives the small-signal response equations. The PSPWM converter has an implicit "slew interval," making the converter dynamics difficult to analyze using traditional averaging techniques. The converter control to output transfer function under continuous conduction mode operation and using voltage-mode control does not exhibit a second order pole associated with the output L-C filter, making it different from a conventional PWM converter. This new PSPWM converter model shows that the output L-C filter is separated into two real poles, with one pole held at constant frequency independent of operating conditions. A characteristic pole depends only upon the converter switching frequency and inductor values. This characteristic pole is fundamental to understanding the PSPWM converter natural and forced responses. The new small-signal model is shown to be in excellent agreement with experimental results.