In this application note, a theoretical derivation of ripple current to average current ratio, also called ripple factor, is introduced to get inductor size equation, which is helpful for capacitor design as well as the total converter design.
ApplicationNote王信雄AN009–Jul2014AN009©2014RichtekTechnologyCorporation1Buck转换器的电流纹波系数CurrentRippleFactorofaBuckConverter摘要电感和电容在Buck转换器中构成低通滤波器,此LC滤波器的转折频率总是设计得较低以便滤除开关纹波。常用的设计规则是,电感电流纹波被设计成电感平均电流的30%左右。本文引入表达电感...
Buck转换器的电流纹波系数 Application Note 王信雄 AN009 – Jul 2014 AN009 © 2014 Richtek Technology Corporation 1 1. 介绍 (2)2. 纹波系数 (3)3. 电感的面积积 (4)4. 一个设计示例 (6)5. 总结 (7)
The least efficiency and least ouput ripplevoltage is featured for force continuous mode with positive and negativecurrent through the inductor. The efficiency and ouput ripple voltage ofpulse skip mode with skipping some swithching pulse is between that oftwo modes above. The methods to calculate...
featuredforforcecontinuousmodewithpositiveandnegativecurrentthroughtheinductor.Theefficiencyandouputripplevoltageofpulseskipmodewithskippingsomeswithchingpulseisbetweenthatoftwomodesabove.ThemethodstocalculatetheinductanceinputcapitanceandoutputcapitancefortheBuckconverterfrom3.3Vto2.5Varegivenintheend.KeyWords:BurstMode...
Fig.8 Scal-unit curves of the average value of inductor current相较于两模式控制策略,该控制方式能够解决在输入输出电压接近时,变换器在Buck模式和Boost模式下频繁切换影响系统稳定运行的问题。而相较于传统的三模式控制策略,改进型三模式控制策略能够降低中间模式下电感电流的脉动和平均值,提高升降压模式下FSBB的...
A single-inductor multiple-output auto-Buck-Boost DC- DC converter with tail-current control[J]. IEEE Transa- ctions on Power Electronics, 2016, 31(11): 7857- 7875.[9] Wang Yao, Xu Jianping, Yin Gang. Cross-regulation suppression and stability analysis of capacitor current ripple ...
For the design of the buck converter, the current ripple in the inductor L and the output voltage ripple in the capacitor C are used as the design criterion. The inductance and capacitance values can be calculated following the expressions of the current and voltage ripples defining the values ...
This decrease in inductor current during TOFF is illustrated in Figure 3. The inductor current decrease during the OFF state is given by: V –V –I R O d L L V L(–) L TOFF This quantity, ∆ I (–), is also referred to as the inductor ripple current. L In ...
After that, considering the reverse slip output inductor current problem which makes the output current ripple larg 7、e, I present another method which can avoid the problem. Key words:Buck converter, soft switching, saber simulation目 录摘 要IABSTRACTII1 绪论11.1 研究背景11.2 研究的目的及意义...