考慮傳導性電磁干擾之返馳式轉換器強健設計

電磁相容(Electro-Magnetic Compatibility, EMC)包括電磁干擾 (Electro-Magnetic Interference, EMI)及電磁耐受度(Electro-Magnetic Susceptibility, EMS)測試。電磁干擾是指由外部來源產生的干擾，其通過電磁感應，靜電耦合或傳導影響電路。並且干擾可能降低電路的性能或甚至阻止其功能作用。就電子設備而言，其功率零組件與控制電路時常設計在一個機殼內，有時還會與電力電子系統相連，且當輸入(Input)/輸出(Output)之連接線的距離較長時，因而產生較大的近場輻射與電磁傳導干擾。本文研究是對電源供應器所產生的電磁干擾用強健參數設計法做設計優化。其目的是找出能降低傳導性電磁干擾的對策及組合。對此干擾問題，有很多影響因素。因解決此問題的參考資料有限，且大多以試誤法或經驗法則的方式進行改善，不但研發時間長，成本高且系統較不具穩健性。因此本文對此問題做一個有規則性的測試及分析，來減少工程師開發的時間，並且能快速的找到一組最佳化的參數來降低電磁傳導干擾問題。本論文將田口方法運用在印表機中的電源供應器模組，此電源供應器模組做為系統分析測試的電源架構為返馳式轉換器電源架構，本文對此架構之應用優化傳導干擾。對電源所產生的電磁傳導干擾問題選出四個主因子及信號與干擾因子進行實驗，得到最具強健性的因子組合。將新的組合重新驗證後，與原設計相比，得到更低的電磁干擾。本研究可提供相關有應用到電源供應器所產生的傳導干擾問題方面的設計參考。若正確的將田口方法應用在類似的問題，能快速且有效建立系統的強健性。

關鍵字

田口方法；返馳式電源；傳導性電磁干擾

並列摘要

Electro-Magnetic Compatibility (EMC) includes Electro-Magnetic Interference (EMI) and Electro-Magnetic Susceptibility (EMS) tests. Electromagnetic interference means a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. The disturbance may degrade the performance of the circuit or even stop it from functioning. From the view point of electronic equipment, power components and control circuits are often designed in a casing, sometimes connected to the power electronic system. When the input/output connection cable distance is long, the generating near-field radiation and electromagnetic conduction interference are large. This thesis optimizes the design of the electromagnetic interference produced by the power supply with the robust parameter design method. The purpose is to find out the countermeasures and combinations that can reduce the conduction of electromagnetic interference. There are many influence factors to this interference problem. Because the reference data to solve this problem are limited, and most of the methods are trial error or rule of thumb, not only is the research and development time long, but the cost is high and the system is less robust. Therefore, this thesis makes a regularity test and analysis of this problem to reduce the time of engineers for development, and can quickly find a set of optimized parameters to solve electromagnetic conduction interference problems. In this thesis, the Taguchi method is applied to the power supply module of the printer product, this power supply module for system analysis and testing of the power supply topology is a flyback converter topology, this thesis optimizes conduction interference for this topological application. Four main factors and signal and noise factors were selected for the electromagnetic conduction interference problem caused by the power supply. The most robust combination of factors was obtained. The new combination was re-verified, and the electromagnetic interference was lower than the original design. This study provides design references for conduction interference issues that are applied to power supply. If the Taguchi method is applied correctly to similar problems, the robustness of the system can be established quickly and effectively.