一款大功率降压型DCDC变换器的建模方法和控制的策略.docVIP

摘要 通信用燃料电池备用电源是一种新型的清洁能源，它不仅可以解决环保问题，同时改善了因为自然灾害导致电网供电中断，进而使通讯中断的难题，因此燃料电池备用电源成为各国研究的热门对象。DC/DC变换器单极点补偿网络和双极点-双零点补偿网络占空比大于50%种结构简单，线性度好的斜坡补偿电路采用UC3843完成峰值电流控制模式的设计DC/DC变换器；电压控制模式；电流控制模式；补偿网络；仿真 Abstract Fuel cells as backup power in the communications is a new type of clean energy, It can not only solve the environmental problem, while improving the Power supply interruption used by natural disasters, avoiding the interruption of communication, Therefore, the fuel cell backup power has became a hot national research. Because the fuel cell output characteristic soft and poor dynamic performance features make it directly as a power source is not appropriate, it must be equipped with power converters to regulate, control and management of power output to make load obtain stability of DC or AC power .In view of the fuel cell many obvious advantages, this paper studies a wide range of DC input, stable DC output, low-cost, high efficiency DC / DC converter. The paper first discusses major role of fuel cells in the communications industry, describes the background and significance of topics and points out the research work the author has done. Secondly, introduces buck converter topology, analysis critical condition of buck converter continuous mode and discontinuous mode. For the continuous mode of buck converter using the state space averaging method modeling analysis, use the knowledge of Automatic Control Theory derive open-loop transfer function of an ideal amplitude-frequency characteristic curve. Finally, according to the difference of buck converter open-loop amplitude-frequency characteristic curve and ideal open-loop frequency response curve design the voltage-controlled and current-controlled buck converter. In the voltage-controlled buck converter I design single-pole compensation network and double-pole double-zero compensation network. Respective, and use saber software simulate two compensation networks. In the current –controlled, I design peak current cont