基于仿真的PWM功率变换器混叠效应研究

COM.P.EL.98. Record 6th Workshop on Computer in Power Electronics (Cat. No.98TH8358) Pub Date : 1998-07-19 DOI:10.1109/CIPE.1998.779678

V. Thottuvelil, G. Verghese

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引用次数: 7

摘要

首先利用开关电路仿真产生电路波形，然后利用fft分析其频谱含量，探讨了脉宽调制功率变换器中的混叠效应。对电压模式控制下开环运行的基本PWM升压变换器的研究结果表明，在接近开关频率或其谐波的频率处扰动控制信号或输入电压会在低差频处产生显著的混叠分量。仿真结果强化了对小信号频率响应信息在混叠显著的频率范围内的局限性的关注。给出了对观测结果进行分析的关键步骤。

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Simulation-based exploration of aliasing effects in PWM power converters

Aliasing effects in pulse-width-modulated power converters are explored by first using switched-circuit simulation to generate circuit waveforms and then analyzing their spectral content using FFTs. The results for a basic PWM boost converter running open-loop under voltage-mode control show that perturbing the control signal or input voltage at frequencies close to the switching frequency or its harmonics can give rise to significant aliased components at the low difference frequency. The simulation results reinforce the concerns raised in regarding the limitations of small-signal frequency-response information in frequency ranges where aliasing is significant. The key steps in analyzing the observed simulation results is also presented.

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COM.P.EL.98. Record 6th Workshop on Computer in Power Electronics (Cat. No.98TH8358)

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