In this thesis , basic principles and some key points of a current mode dc - dc converter were given firstly . then , the whole chip diagram was proposed according to the design specification and the whole chip operational principle was introduced 接着从设计要求的角度出发提出了整体电路的架构设计,阐述了整体工作原理,并根据整体电路的功能要求完成了子电路的设计与仿真。
Aimed at the single - chip switching mode power supply circuits , which presently have wide applications in portable devices , control circuits applied in a high efficiency boost dc - dc converter for driving white leds have been designed in this thesis 论文针对现在广泛应用于便携式设备的单片开关电源电路,分析和设计了一种驱动白光led的高效升压dc - dc转换电路中的控制电路。
A new type 270v input / single phase 115v output aviation static inverter ( asi ) is researched in this paper . adapting a modularized scheme , the asi is constructed by four isolated dc - dc converters and a cascade inverter 本文研究270v输入/单相115v输出航空静止变流器,采用一种模板化的方案,静止变流器由多路隔离直流电源和级联逆变器构成,本文重点研究其中的直流变换环节。
However , these converters become more complicate . phase - shift bi - directional dc - dc converter is attractive since it operates with fixed frequency , has small voltage and current stress and can realize zvs without auxiliary switches 相移控制双向dc - dc功率变换器因具有功率器件电压,电流应力小,定频工作和无须增加辅助器件即可实现功率器件的零电压开关条件等优点而受到关注。
Bi - directional dc - dc converters can easily control the transfer of power between two dc sources , and will be widely used in applications as fuel cell vehicles , aerospace systems , and new power generation system which utilize clean energy 高功率密度双向dc - dc功率变换器能够高效率、灵活地实现对电能双向流动的控制,将广泛地应用在混合动力汽车、航天供电系统、新能源再生能源发电等系统中。
For the portable electronic products powered from batteries , the implementation technique of pwm current mode in dc / dc converter is studied in this thesis and a boost dc - dc converter using 0 . 6um bcd technology is designed 本论文是与一家境外公司合作的项目,基于使用电池供电的便携式电子产品的应用背景,研究了升压型dc / dc变换器的实现技术,设计了一种pwm电流控制模式的升压型dc - dc变换器控制ic 。
Recently , a new scientific idea that nizn takes place of mnzn is born . it is helpful for increasing the work frequency of dc - dc converter . therefore , the relative researches are becoming the hotspot and bottleneck . the statement above are the background and objective of the paper 近年来,一个新的科学思想诞生,即能否用电阻率高达106 cm的nizn铁氧体替代mnzn铁氧体材料,同时使开关电源频率上限向10mhz迈进。
The mathematical and circuit analyses of the converter show that the output current of the dc - dc converter tends to be saturated with the gradually increasing product of the operation frequency and the capacitor capacitance in the case of a determinate effective loop resistance 分别用matlab和pspice从理论和电路两个方面进行的仿真研究都表明：在等效同路电阻一定的情况下， dc - dc变换器的输出电流随工作频率和电容容量乘积的增大而趋于饱和。
This paper makes a detailed analysis as to the fundamental circuits and fundamental principles of boost dc - dc converter , spwm inverter and ac voltage adjustment circuit in the power supply . at the same time , the paper introduces the choice of the parameters and the design of control 本文分别对逆变电源中的boost升压斩波电路、 spwm逆变电路以及斩控式交流调压电路从基本拓扑结构和工作原理上进行了详尽阐述，同时介绍了各功能模块的参数选取和控制设计。
1 . nizn ferrite was developed for using in mini high frequency dc - dc converters and inductors . we measured and analysed the parameters of the nizn ferrite , which we concern about when designing the dc - dc converter . 2 . the low loss sample of nizn ferrite were chosen for design - optimization of the high frequency transformer . based on the relevant theoretical researches , the loss properties of the magnetic core material and winding were analyzed in this thesis 因此,以nizn功率铁氧体材料为开关电源芯材为基础,并优化各种开关电源的设计已成为国际上的热点和技术瓶颈,本论文正是以上述背景为研究目标而开展工作的,主要进行的工作和创新有: 1 .对研制的新型高频低功耗的功率nizn材料进行参数的测试,并针对dc - dc变换器设计关心的参数对芯材特性进行了分析,选择在特定频率下,功耗较小的nizn材料磁芯样品作为变压器优化设计的预备磁芯。
