A Carrier-Phase Control Suitable for Conducted EMI Noise Reduction in a Multiple-Converter System

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  • 複数の電力変換装置から構成されるシステムにおける雑音端子電圧低減に適したキャリア位相制御法
  • フクスウ ノ デンリョク ヘンカン ソウチ カラ コウセイ サレル システム ニ オケル ザツオン タンシ デンアツ テイゲン ニ テキシタ キャリア イソウ セイギョホウ

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Abstract

Conducted EMI noise flowing from the power converters to AC utility line is regulated by international commissions such as International Electrotechnical Commission (IEC). For adherence to the IEC regulations, EMI filters should be used in power electronics equipment.<br>This paper proposes a method for analyzing the conducted EMI noise in multiple power converters connected to the same power line. In this method, the phase difference between sub-harmonic modulated carrier signals at each power converter is taken into account. The phase difference among the power converters determines the EMI noise level in a multiple-converter system, as is evident from the analysis of the waveform of the common-mode current. In addition, EMI noise suppression using a carrier-phase control is a proposed. In order to reduce volume of the EMI filter effectively, the phase difference θ should be set to 360/nN°; here, n is a high-order harmonic component at around 150kHz, and N is the number of power converters. Therefore, the conducted EMI noise can be reduced effectively with the help of the proposed phase control.

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