耦合電感搭配C-W切換電容式升壓型直交流逆轉換器之設計與實作

本文提出耦合電感搭配Cockcroft-Walton(C-W)切換電容式(CICWSC)升壓型直交流逆轉換器之設計與實作，並結合相位產生器與正弦脈衝寬度調變(sinusoidal pulse-width-modulation, SPWM)控制器，以進行高功率升壓轉換及調節，電力電路由三部份所組成 (i)耦合電感升壓電路 (ii)C-W倍壓電路結合切換電容 (iii) 半橋式直流轉換器藉由二個開關及二個電容所組成，並由正弦脈衝寬度調變控制器控制開關實現正弦波輸出，所以該電路穩態時電壓範圍:+[(n+1)/(1-D)]VS～-[(n+1)/(1-D)]VS的直流-交流轉換器，其中D是耦合電感充電的工作周期，n是耦合電感的匝數比。當D=0.5、n=2時，最大輸出電壓可以到達電壓源VS的6倍壓。此外，SPWM使用於閉迴路之中，進而增加該電路調節能力，以進行不同輸出電壓/負載(輸出電壓之峰值或頻率/負載之大小變化)之實現能力。最後，本文所提出的CICWSC之升壓型逆轉換器是使用SPICE來模擬該電路之工作，所有的靜態與動態之模擬與數據量測結果來顯示逆轉換器的輸出，最後亦實作出電路，以證實本文所提出轉換器之可行性。

關鍵字

考克饒夫－瓦耳頓；升壓型直交流逆轉；正弦脈頻調變；耦合電感

並列摘要

A coupled-inductor Cockcroft-Walton-switched- capacitor (CICWSC) inverter is proposed by combining a non- overlapping circuit and sinusoidal pulse-width-modulation (SPWM) controller for boost DC-AC conversion and closed- loop regulation. The power part is composed of three sub- circuits, including: (i) coupled-inductor booster (CI booster), (ii) Cockcroft-Walton- switched-capacitor doubler (CWSC doubler), and (iii) half-bridge DC-link, so as to obtain an AC output range:+[(n+1)/(1-D)]VS～-[(n+1)/(1-D)]VS,where D is the duty cycle and n is the turn ratio of coupled-inductor. Practically, the maximum output voltage can reach 6 times voltage of source VS while D=0.5, n=2. Here, the SPWM is employed to enhance regulation capability for the different output amplitude and frequency, as well as robustness to source/loading variation. Finally, the closed-loop CICWSC inverter is designed and simulated by SPICE for some cases: steady-state and dynamic responses. All results are illustrated to show the efficacy of the proposed scheme.