電力変換回路の伝導妨害波予測を目的とした線形等価回路モデルの検討: デュアルポートLISNを用いたモデル構築

摘要

電子機器の省エネ化が進むなかで電力変換回路から発生する伝導妨害波の低減設計が重要となっている。伝導妨害波は規制値内に収めらければならない。本報告では、IC/LSIのEMCマクロモデルであるLECCSモデルをベースに構築した伝導妨害波を予測するための線形等価回路モデルについて述べる。またモデル構築のために作製したDual Port LISN(DP-LISN)についても報告する。今回はEUTに卓上IHを使用した。線形等価回路モデルの定数はDP-LISNの負荷抵抗を切り替えることで10組の負荷条件で伝導妨害波電圧を測定し、それらの最小二乗近似により決定した。構築した線形等価回路モデルを用いて伝導妨害波電圧シミュレーションを行い、その結果、シミュレーションによる伝導妨害波強度の周波数変化は実測結果と一致した。%A reduction design of conducted disturbance from power converter circuits is becoming more important as electronic devices are requiring much more power efficiency. Conducted disturbance must meet domestic and international regulations. In this paper, a linear equivalent circuit model on the basis of a EMC macro-model of IC/LSI, LECCS model, is investigated to predict the conducted disturbance of power converter circuits. The du-al-port LISN (DP-LISN) constructed to provide the model is also reported. In the study, an commercial table-top induction heater is used as the equipment under test. Conducted disturbance voltages were measured with 10 different load pairs of the DP-LISN. Model parameters were then determined by the least square method with the conducted disturbance voltages measured. We simulated conducted disturbance voltages for evaluation by use or the linear equivalent circuit model as an evaluation of the model. As comparing simulated and measured disturbance voltages, the spectrum of the conducted disturbance voltages agreed with each other in their envelopes.