利用電壓箝制及柔性切換技術之電流源正弦電壓驅動電路

專利類型

發明

專利國別 (專利申請國家)

美國

專利申請案號

11/534,003

專利證號

US7,262,979

專利獲證名稱

利用電壓箝制及柔性切換技術之電流源正弦電壓驅動電路

專利所屬機關 (申請機關)

元智大學

獲證日期

2007/08/28

技術說明

本發明以電壓箝制及柔性切換技術，研製直流電壓轉換成交流正弦電壓之驅動電路，一般簡 稱反流器。主要應用於燃料電池、太陽光電能源、蓄電池以及不斷電設備之直流轉換成市電 交流電路。本發明運用電流源對輸出電容及負載直接高頻切換充電控制，以累積正弦波電壓 輸出，其特徵分述如下: 1.利用電壓箝制技術、半諧振特性以及控制電感電流於不連續模式，使得全部半導體開關及 二極體均有柔性切換特性，最高轉換效率大於95%。 2.本發明所運用之電壓箝制技術，可降低開功率半導體關元件之耐壓規格。 3.本發明所需之電感容量與體積小於一般電流源架構，可快速調整電流以供應負載所需。 4.本發明裝置之輸出端可省略濾波電感，電流源直接對輸出負載及濾波電容充電，因此可接 受各種電感性、電容性、非線性及瞬間變化之負載，且輸出電壓波形失真率及傅立葉頻譜分 析均優於傳統脈波寬度調變架構。 In this invention, a current-source sine wave voltage driving circuit via voltage-clamping and soft-switching techniques is investigated and is applied mainly to the fuel cell, solar energy, battery and uniterruptable power systems for inverting DC voltage into utility AC voltage. In general, it is called for short an inverter. The traditional voltage-source inverter is operated by the pulse-width-modulation (PWM) technique with an adequately designed inductance and capacitance filter to produce the fundamental AC sine wave. By this way, it limits the applied type of loads and the regulation ability under loads being varied suddenly. In the meanwhile, it has more waveform distortion and high- frequency harmonic components. This invention utilizes a controllable current source to supply the output capacitors and loads with high frequency switching for integrating the output sine wave voltage, and its specific characteristics are outlined as follows. 1) This scheme uses the voltage-clamping technique and quasi-resonant property, and controls the inductance current in discontinuous conduction mode so that all semiconductor switches and diodes have the soft- switching characteristics and the maximum convention efficiency is more than 95%. 2) The utilization of this voltage-clamping technique can reduce the voltage specification to be sustained by the switch devices. 3) The value and volume of inductors in the current source are smaller than those in a conventional current-source mechanism so that it can adjust the inductive current promptly to satisfy the requirement of the supplied loads. 4) The needless of the output filter inductors makes it suitable for various inductive, capacitive and nonlinear loads, even change abruptly, and the analyses of Fourier spectrum and voltage distortion are superior to the traditional PWM scheme.

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