The development of microprocessor provides a new method for switching mode power supply control - digital control . digital control has many advantages such as repeatability , durability , adaptability and so on 微电子集成技术的发展为电力电子控制技术提供了新的思路,由六十年代的分立元件发展到后来的集成电路、大规模集成电路、微处理器等,为功率变换的控制带来了极大的方便。
The more functions there are , the more power losses they disspate . thus they require the battery power supply system ’ s size smaller , weight lighter and efficiency higher . to meet these requirements , high efficiency dc - dc switching mode power supply is adopted 目前的手机等各种高效便携式电子产品日趋小型化,并且随着功能的不断增多其功耗也随之增大,因此要求其电池供电系统体积更小、重量更轻、效率更高,从而须采用高效率的dc - dc电源。
With the development of power electronics , switching mode power supply ( smps ) must have higher frequency , higher power density , higher efficiency , higher power factor ( pf ) and higher reliability . to be practicability , the circuit must be simple and small 随着电力电子技术的不断发展,要求开关电源有更高的频率、更高的功率密度、更高的效率、更高的功率因数和更高的可靠性,同时还要求其电路相对简洁,并有较小的体积,这样才更具实用性。
In the following section , the thesis demonstrated the robustness of the proposed method in the computation of radiated electromagnetic fields of switched mode power supplies by means of a numerical study on the electromagnetic fields of an electric dipole antenna 应用本文开发基于pml吸收边界条件三维时域有限差分计算软件,计算了电偶极子天线的三维辐射电磁场,并将计算结果与解析解进行了对比分析,验证了时域有限差分法计算高频开关电源辐射电磁干扰的有效性。
Abstract : this paper describes the operation characteristics of metal halide high indensity discharge lamp . it is to developped the switching mode power supply of light source in multimedia projector on color lcd application on high pwm convertortechnique , the circiut diagram and experimental results are given 文摘:简述金属卤化物高强度气体放电灯的特性,应用高频pwm开关变换技术,研究成功彩色液晶多媒体投影机光源用开关电源供电系统,给出原理电路和试验结果。