本文主要為研製一可偵測間距與負載之單級高功因非接觸供電系統，將升壓式轉換器操作在不連續導通模式，達到自發性功因校正之功能。結合半橋串聯諧振式轉換器，將開關切換頻率操作在諧振頻率之上，達到零電壓切換，減少開關切換損失。此外，提出間距與負載偵測機制，利用電磁耦合的原理，設計一個可同時傳輸能量與訊號之非接觸供電系統，將訊號迴授至一次側微控制器。實驗證實，在不同間距與負載，間距訊號線圈和鐵心間距有關，負載訊號線圈和輸出負載有關，利用一次側變頻方式控制二次側輸出電壓穩定，系統之功因可達到0.986以上並且符合IEC 1000-3-2 Class-D之諧波規範。本文所提之可偵測間距與負載之單級高功因非接觸供電系統具有架構簡單、低成本、高功因與低諧波干擾等優點。 In this thesis, a single-stage non-contact power system having high power factor with gap and load detection is porposed. The boost converter is operated in discontinuous conduction mode (DCM) for achieving power factor correction(PFC). In order to achieve zero-voltage switching and reduce the switching loss, with half-bridge series resonant converter, the switching frequency is designed to be higher than the resonant frequency. Furthermore, this study proposed the gap and load detection mechanisms, based on electromagnetic theory. The designed non-contact power system, is able to transfer energy and signal simultaneously. Under variation of gap and load, experimental results verify that the signal of gap detection core is related to the gap and the signal of load detection core is related to the output, by varing the primary switchting frequency to controll the output voltage . The proposed system successfully meets IEC 1000-3-2 Class-D requirements and power factor can be achieved up to 0.986. The proposed single-stage non-contact power system having high power factor with gap and load detection has the advantages of simple structure, low component count, high power factor and low harmonic.
