本文建立了一個具負載與間距偵測之非接觸式供電系統，利用諧振的方式將能量透過變壓器耦合傳送至負載端，為了系統的穩定與性能的控制，負載與間距變化情形是必須曉得的，由於非接觸式結構上的分離，要確切的瞭解目前負載與間距狀況並不容易。本文係針對非接觸式供電系統之負載與間距變化情形提出一種偵測機制，設計一個具有能量與訊號同時傳輸的非接觸式供電系統，利用電磁耦合的原理，將能量線圈與訊號線圈透過一、二次側鐵心作傳輸，在傳遞能量的同時運用鐵心本身耦合的物理特性，將訊號取出傳送至微控制器作控制。在能量傳輸部分，使用半橋式串連諧振電路，將操作頻率操作在諧振頻率之上，使功率開關達到零電壓切換，以減少切換損失。在訊號傳輸部分，主要是從一、二次側鐵心上設計負載訊號線圈與間距訊號線圈，運用鐵心本身磁場大小與磁場方向的分佈，再經由本文所設計之負載與間距偵測電路，將訊號迴授至一次側微控制器，以控制整個非接觸式供電系統。實驗證實，本文所提出具負載與間距偵測之非接觸式供電系統，負載訊號線圈與輸出負載有關，間距訊號線圈與鐵心間距有關。隨著負載與間距的不同，輸出電壓可由一次側操作頻率來控制達到二次側輸出穩壓的效果。非接觸式供電系統可發展到電動刮鬍刀、手機、電動車、人工心臟等應用。 In this thesis, we design a non-contact power system with load and gap detection. The primary uses the resonant way to transfer energy to the load by transformer coupling. In order to stabilize the system output and performance, it has to detect the core gap and load. Unfortunately, it is not easy to realize due to the separation of the non-contact structure. This thesis proposes a new detective mechanism to detect the variations of load and gap in non-contact power system. Based on electromagnetic theory, we design a non-contact power system, which is able to transfer energy to the secondary and to feedback energy and signal transfer from the secondary. Moreover, it also uses core self-coupling effect to transfer the energy and signal to the microcontroller through primary and secondary. In order to decrease the power transfer loss, we design a half-bridge series resonant circuit, operating at higher frequency than resonant frequency to achieve zero-voltage switch. In terms of signal transfer, we design a coil to detect both load and gap signals. Then, signals are fed back to the primary controller to control the whole non-contact power system. Experiment results show that: 1) the signal of load detect core is related to the load output and 2) the signal of gap detect core is related to the gap. It is easy to control the output voltage by adjusting the primary operating frequency under variations of load and gap. This non-contact power system is applicable to electric shaver, cell phone, electric car, and artificial heart applications.
