- 學位論文
應用磁滯電流控制法則於並聯半橋功因修正電路
Appling bang-bang current control for Half-Bridge power factor corrector
摘要
由於電子科技產品皆為非線性負載，使得輸入電源多含有高次諧波，或因負載過大而造成功率因數下降及輸入電流的諧波失真，因而在能源效率及功率因數的改善是相當重要的課題。一般電源系統在功率因數的改善是串接電感、並接電容於輸入端以改善電流波形，但所造成之諧波更容易損壞電子設備。而降低諧波、提升效率與功因之改善是我們在研究電源能量轉換所需追求的目標。 大部份主動式PFC應用於升壓型 Converter之功率因數改善，控制方法採定頻PWM控制、滑模時變控制、控制開關之Duty，而提高功率因數的方式是使電源電流與電源電壓同相位(In phase)。 本論文是應用時變磁滯電流控制並聯半橋功因修正電路(APLC)的直流電壓，並隨時適當修補輸入電流使之與輸入電壓同相位，以提升功率因數。 我們設計半橋二開關功率因數修正電路以修正命令電流斜率的變化，使輸入電流被限制於參考值的區間，並探討半橋功因修正電路之電容電壓對輸入電流波形與Buck負載之間的關係。 從本半橋功因修正電路實作中我們可以驗證修正電路之電容電壓、負載與輸入電流波形之間的關係，並驗證命令電流斜率為時變可修補輸入電流使之操作於不失真及低切換損失之最佳狀況。 關鍵字：功率因數修正電路、輸入電流斜率、磁滯電流控制
並列摘要
Electric products have nonlinear loads in the age of scientific, that include harmonics or heavy loading such that PF decrease and input current distorted. So, the energy performance and PF improvement are very important In general ways, that method of adding a series inductor or a parallel capacitor in the input terminal is used. But it is easy to damage equipments. Most of the active power factor correctors applying in boost converter to improve power factor using the control methods shuc as fixed frequency PWM control, sliding time variant control and MOSFET switching Duty. The paper of PF improvement is to make the input current and input voltage in phase. The subject of this thesis is applying bang-bang current controll in parallel half-bridge power factor correction circuit for adjusting the slop of command current , by measuring the peak slope of the command for the compensating current within reference values such that the input current and input voltage in phase to improve the power factor. It has been proven that the result of the input current slop is limited between the reference values for undistorted source current and a minimum switching loss. Keyword: bang-bang current controlled, power factor correction circuit, the slop of command current.