Abstract : in recent years , with the successful application of hig h - frequency switching power supply in communication power , there are a lot of con trol circuits for power factor compensation now . in this article , the writer reco mmands a kind of practical and reliable control circuit 文摘:近几年来，高频开关电源成功地应用于通信电源上，而用于功率因数校正的控制电路有多种，现只介绍一种实用可靠的控制电路的功能、特点及控制方法
T / r module is a functional module for the new radar , that is active phase control array radar , and t / r nodule system - integrates high frequency switches , phase shifter , lna and power amplifier , etc . if using low cost thick film technology to manufacture t / r module , it will be benefit to accelerate the applicants and development of the active phase control array radar T r模块是实现新型雷达? ?有源相控阵雷达需求的功能模块，它系统地集成高频开关、限幅器、移相器、 lna及功放等。利用厚膜的廉价成膜工艺技术制作t r组件模块，则有利于加速有源相控阵雷达的应用与发展。
Secondly , the model of the high frequency switching mode power supply transformer with the lest loss and highest efficiency was set up . with the genetic algorithm and microsoft visual foxpro 6 . 0 , the optimization designing software of high frequency switching mode power supply transformer ? hfsmpst expert v1 . 0 was developed . then the sample of the high frequency switching mode power supply transformer was produced 接着本文建立了损耗最小、效率最高的高频开关电源变压器的设计模型，利用遗传算法和microsoftvisualfoxpro6 . 0开发了高频开关电源变压器优化设计软件hfsmpstexpertv1 . 0 ，研制了高频开关电源变压器样品并介绍了其工艺方法和流程，最后本文通过实验测试验证了设计的正确性，实现了预定的研究目标。
The twelve kinds of modes and equivalent circuits of this inverter with high frequency link within one high frequency switching period are carefully analyzed ; by using the state - space averaging approach , the inverter ’ s averaging model is presented , and the design criterion of key circuit parameters and the output characteristic curve are given ; the analyses of the system stabilization and the mathematic analyzes of the principle of high - frequency - link of this inverter have also be done . prototypes for 1kva 270v 10 % dc / 115v400hzac uni - polarity phase shifting controlled bi - directional voltage mode inverter with high frequency link is designed 以全桥桥式拓扑为例,论述了双向电压源型高频环节逆变器单极性移相控制的原理、逆变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逆变器平均模型,获得了这类逆变器的关键电路参数的设计准则和外特性曲线;分析了系统稳定性,并对逆变器高频环节原理进行了数学分析。
The design and realization of the switching source charger with phase - shifted zero - voltage - switching converter is discussed particularly , and a distributed system is designed to improve the dependability and expansibility . the nonlinear model about high frequency switching source charger is built and the way of realization of charger control system is analyzed 详细介绍了全桥移相零电压软开关高频开关电源模块的设计与实现，利用该模块设计了一种分布式充电机系统，提高了系统的可靠性和可扩展性。
There are three problems which must be solved in the construction of the 198 / 199 network , because of its high - speed and vast - region : simulcast interfering in the simulcast area ; communication interruption between paging zones ; signals of multi - frequencies switching invalidation between simulcast systems . the basic principles of the high - speed paging protocol ( flex ) and the iner - paging - network protocol ( ipnp ) are analyzed in the paper 由于广域高速寻呼网络的技术特点，在198 199网络的建设设计和运营中要着重解决三大技术问题，即：同播区内的同播干扰问题；寻呼区间的ipnp联网障碍；以及同播区间的flex多频漫游信号切换障碍。
The 1mhz fixed frequency switching allows for tiny external components and the regulation scheme is optimized to ensure low emi and low input ripple . an external resistor sets the full - scale led current , while two digital inputs control on / off and select amongst three levels of brightness . the circuit operates in 1x mode until just above dropout 工作在1mhz固定频率,采用线性调制模式使输入纹波大大减小;利用一个外部电阻可以设置满量程led电流;外接两个数字信号控制芯片开关并选择led三级亮度中的一级;具有过温、过压/欠压等保护功能,工作温度范围为- 40 + 85 。
High frequency switching technique is becoming more popular in the power electronics area , the high frequency power transistors are applied in the buck - boost type chopper system . the characteristics of power mosfet and insulated gate bipolar transistors ( igbt ) , some new kinds of power swithing devices , are deeply studied 高频开关技术是当今电力电子技术发展的方向，本文研究的buck - boost斩波系统中采用了高频功率器件，所以本文对新型开关器件? ?功率mos场效应管[ mosfet ]和绝缘门极晶体管[ igbt ]的特性进行了初步研究。
The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer , which consists of the phase accumulator , the sine look - up table , the digital to analog converter and the low band filter . it is of high frequency resolution , fast frequency switching speed , low phase noise , the ability to switch frequencies while maintaining constant phase , and the ability to producing arbitrary waveforms 直接数字频率合成器是一种全数字化的频率合成器，由相位累加器、波形rom 、 d a转换器和低通滤波器构成， dds技术具有频率分辨率高、频率切换速度快、频率切换时相位连续、输出相位噪声低和可以产生任意波形等优点。
The twelve kinds of modes and equivalent circuits within one high frequency switching period are carefully analyses . by using the state - space averaging approach , the converter ' s averaging model is presented , the output characteristic curve and design criterion of key circuit parameters such as output voltage , filtering inductance , common conduction time , uni - polarity spwm waveform ' s duty cycle etc are given 详细分析了这类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，获得了输出电压、滤波电感电流、共同导通时间、单极性spwm波占空比等关键电路参数的设计准则和变换器的外特性曲线。
