Chloride masterguard power systems limited shanghai ( renamed from siemens telcom power supply limited shanghai ) , is a jv affiliated to chloride group which is a world leader in the field of power systems , which is specialized in producing high frequency switching power supply systems at advanced technology level 上海科瑞曼士德电源系统集成有限公司(原上海西门子通信电源有限公司)是从属于在电源系统领域处于世界领先地位的英国科瑞集团,是生产具有高科技水平的高频开关型交流/直流整流电源系统的合资企业。
By the development of high frequency switch , low frequency transformer has been withdrawn from many domains . but in the domain of ups , linear power amplifier and the inverter output low frequency ac , for the purpose of isolation and change voltage , there is no choice but to use low frequency transformer 高频开关技术的发展，使工频变压器从许多领域中退了出来，但是在需要隔离的ups不间断电源、数码线性功率放大器、要求输出低频正弦波的dc ac变换器等许多领域中，为了隔离或变换电压的需要，以至不得不保留了低频变压器。
The twelve kinds of modes and equivalent circuits of voltage mode ac - ac mode ac / ac converters with high frequency link within one high frequency switching period are carefully analyses . by using the state - space averaging approach , the converter ' s averaging model is presented , and the design criterion of key circuit parameters and the output characteristic curve are given 以全桥桥式拓扑为例，论述了单极性移相控制的原理、单极性移相控制电压源交?交型高频环节ac ac变换器在一个高频开关周期内的十二个工作模式及其等效电路。采用状态空间平均法建立了变换器平均模型，获得了关键电路参数的设计准则和变换器的外特性曲线。
First in this thesis , calculation methods and work states of five high frequency switching mode power supply transformers in circuit form had been studied systematically . then the optimum square - approach - method was used to fix the pcv - f - bm curve of the pc40 magnetic core material . the values of m1 , m2 and m3 in the high frequency formula pcv = m1 * bm2 * fm3 can be gotten and the experience values of these parameters during the traditional design was modified 首先本文系统研究了五种电路形式的高频开关电源变压器的工作状态及其计算方法，然后用最佳平方逼近法对pc40磁芯的pcv f bm曲线进行拟合，求得了高频下磁芯损耗pcv = m1 * bm2 * fm3公式中的m1 、 m2 、 m3值，修正了传统设计中对这三个参数的经验取值。
Based on the relevant theoretical researches , the loss property of the magnetic core material and winding were analyzed in this thesis . and 500 khz high frequency switching mode power supply transformer was made of pc40 magnetic core material for the first time in this thesis , which has good application perspective and can lead to enormous economic profits 本文在理论研究的基础上，仔细分析了磁芯材料及绕组的损耗特性，首次采用pc40磁芯材料设计了500khz高频开关电源变压器，这在工程上有良好的应用前景和经济效益。
Chloride masterguard power systems limited shanghai - cmps ( renamed from siemens telcom power supply limited shanghai ) , is a jv affiliated to chloride group which is a world leader in the field of power systems , which is specialized in producing high frequency switching power supply systems at advanced technology level 上海科瑞曼士德电源系统集成有限公司(原上海西门子通信电源有限公司)是从属于在电源系统领域处于世界领先地位的英国科瑞集团,是生产具有高科技水平的高频开关型交流/直流整流电源系统的合资企业。
Direct digital synthesizing is a new frequency synthesizing technology , which adopts phase increment controlled by digital . it has so many virtues such as high frequency relution , fast frequency switching ability , continuous phase , low phase noise and integration easily for its numberic operation that has been adopted widly 直接数字合成dds ( directdigitalsynthesize )是新一代的频率合成技术，它采用数字控制信号的相位增量技术，具有频率分辨率高(可达mhz至hz量级) ，频率切换快(可达几十ns量级) ，频率切换时相位连续和相位噪声低以及全数字化易于集成等优点而被广泛采用。
