本論文係以半橋式脈波相移電力轉換器為基礎，設計出零電壓柔性切換半橋式DC/DC電力轉換器(ZVS-PWM half-bridge DC/DC converter)，並推導其小訊號數學模式，利用IsSpice模擬與電路實作以驗證其理論推導之正確性。最後，再根據數學模式設計穩壓控制器，使得輸出電壓不受線電壓及負載變動的影響。
　　傳統半橋式電力轉換器，當兩個主開關皆為off時，開關寄生電容與變壓器漏電感產生共振，但因共振頻率過高(約為 )，若要達零電壓切換，則轉換器屬於變頻控制。脈波相移技術即是將傳統半橋式電力轉換器之其中一個開關驅動信號平移，使其靠近另一個開關驅動信號，在沒有額外加入其它元件的情況下，使一個開關達到零電壓切換，卻無法兼顧到另一個開關。
　　本論文所提出的新型半橋式轉換器，係於半橋式脈波相移電力轉換器中加入輔助開關，使共振暫停，達到定頻控制之目的。此外，兩個開關均可達到零電壓切換，故可提升轉換器效率 。
　　針對本論文所提出之零電壓柔性切換半橋式電力轉換器，吾人進行動作原理分析，再以平均化法，推導轉換器之小訊號數學模式，以研究其動態行為。相較於傳統半橋式電力轉換器，零電壓柔性切換半橋式電力轉換器具有較好的動態響應。為了達到輸出穩壓的目的，吾人依據數學模式，設計古典PI控制器。經由實作結果可知，在負載或線電壓變動下，所設計之控制器具有良好的穩壓效果。

　　In this thesis, based on the duty-cycle-shifted-PWM half-bridge (HB) converter, a ZVS-PWM half-bridge DC-DC converter is well designed. The ac small-signal mathematical model for the HB ZVS-PWM DC-DC converter is then derived. The theoretical analysis is verified by experiment and simulation of IsSpice. Finally, the controller is designed to achieve output voltage regulation. It is used to eliminate the effect of the variations of line voltage and load on the output voltage.
　　In the conventional HB converter, the oscillation between the MOSFET junction capacitance and transformer leakage inductance occurs when both switches turn off. In order to achieve ZVS, the converter is a variable frequency operation. The concept of this control scheme is shifting one of the two-channel symmetric PWM driving signals close to the other, while keeping the PWM control mode. As a result, ZVS is achieved for only one switch.
　　In this thesis, a novel half-bridge converter is proposed. The auxiliary switch is added to the HB duty-cycle-shifted PWM converter to create ZVS condition for both switches. It is a fixed frequency operation and the efficiency of the converter is improved to 93%.
　　The detailed circuit analysis for the proposed HB ZVS-PWM converter is also presented in this thesis. The small-signal model is then derived by the averaging method. Based on this model, the system dynamic behaviors can be investigated. As compared with the conventional HB converter, the HB ZVS-PWM converter exhibits better dynamic response. According to the small-signal mathematical model, a classical PI controller is designed to achieve output voltage regulation. The experimental responses show that the PI controller has a good regulation capacity under the variations of load and line voltage.

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