具諧波回授隨機脈寬調變換流器之設計

本文以具諧波回授之隨機諧波取樣脈寬調變(Random Harmonics Sampling Pulse Width Modulation ,RHSPWM)方式，用以降低低階諧波及側頻(Side Bands)所造成的噪音。一般馬達驅動使用正弦脈寬調變(Sinusoidal Pulse Width Modulation ,SPWM)方式，會使諧波能量集中於側頻；且切換頻率在20 kHz以下的機械振動和電磁干擾因素而產生擾人的噪音。然而隨機脈波寬調變設計，可有效降低切換頻率所產生的噪音。實驗以冷氣壓縮機驗證正弦脈波寬調變之諧波回授模式，使側頻能量分散於有限頻帶，進而降低聲音分貝(dB)值。

關鍵字

隨機脈寬；諧波能量；傅立葉分析

並列摘要

A modulation scheme for random harmonics sampling pulse width modulation (RHSPWM) inverter with harmonic feedback is proposed in this thesis to eliminate low-order harmonic and reduce the side-band harmonic acoustic noises. For motor driven by sinusoidal pulse width modulation (SPWM) inverter, the energy is concentrated on side-band harmonic which results in annoying noises due to mechanical vibration with inverter switching frequency below 20 kHz and electromagnetic interference (EMI) problems for electrical system. The proposed RHSPWM inverter is designed to reduce the uncomfortable acoustic noise and noise volume with the switching frequency. A compressor for air-conditioner is used for experiment to verify the proposed SPWM with harmonic feedback. The results show that the side-band harmonic are spread-out and normalized and the acoustic noise volume (in db) is reduced as well.

並列關鍵字

random pulse width ； harmonic energy ； fourier analysis

參考文獻

[1] 林國豐，“高雄國際機場不同運量情境之航空噪音影響分佈模擬及評估”，國立中山大學環境工程研究所碩士論文，2005 。

Google Scholar

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