【经验】开关电源输入电容的容值及直流电压计算方法

时间： 2018-08-22 来源：世强

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很多工程师对于电容的用法都很清楚，电容可以滤波、旁路、去耦、储能。但是在选用电容的时候，我们都是凭借经验去选用相关的电容，对于电容的容值和直流电压的具体算法却不是很清楚。为了方便大家能更好地理解电容，我在这里给大家详细讲解开关电源的输入电容的容值和直流电压的算法。

市电经过桥式整流，再经过输入电容，其波形如下图所示（虚线和正弦波从Vmin上升到Vp的那段波形）：

电容的容值计算步骤如下所示：

1. 市电为正弦波V=Vp*，w=2Πf(f为市电的频率)

2. Pin=Po/η=(0.5CVp^2-0.5CVmin^2)/ Δt

3. Δt=t1+t2,t1=1/4f

Vmin=Vp*Sin(2Πft2)，t2=

一般Vmin=0.8Vp，Vp为输入电压最小时的峰值

4. 所以 C=2Po(1/4f+)/ (η(Vp^2-Vmin^2))

电容的最小和最大的DC电压计算步骤：

1. 一般电容的最大纹波电压ΔVdc(max)为√2*Vmin的10~15%，Vmin为输入的最小电压；

2. 利用最大的电压纹波，可由下式算出电容的最小和最大DC电压：

Vdc(min)= √2*Vmin-ΔVdc(max)

Vdc(max)= √2*Vmax，Vmax为输入的最大电压

由上述公式计算出电容容值和DC电压，这样选用输入电容的时候只要电容的容值大于或等于C，耐压值大于或等于Vdc(max)，可以快速选用合适的电容。

关于电源输入电压的电解电容，世强代理的Nippon Chemi-Con(黑金刚)有丰富的型号选择（PAG系列，KXL系列，KXJ系列等），如下图所示：

如果感兴趣的话可以登录以下网址https://www.sekorm.com/doc/previewDoc?docId=403538，这里有黑金刚铝电解电容的详细介绍。

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全部评论（7）

阿刁 Lv4. 资深工程师 2023-11-24

学习一下
吊个天 Lv7. 资深专家 2018-10-31

这资料
龙言无忌 Lv7. 资深专家 2018-10-26

了解一下
Jin Lv8. 研究员 2018-10-08

挺不错的！
会飞的狼 Lv7. 资深专家 2018-10-07

计算太复杂了，已经不会计算了。

有容乃大 Lv9. 科学家 2018-09-28

看看
terrydl Lv9. 科学家 2018-08-22

看看

没有更多评论了

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2023/6/12 - NIPPON CHEMI-CON - 数据手册代理服务技术支持现货查询批量订货查看更多版本

KMR Series Downsized snap-ins, 105°C LARGE CAPACITANCE ALUMINUM ELECTROLYTIC CAPACITORS

型号- EKMR401VSN271MP45S,EKMR181VSN122MP50S,EKMR201VSN561MQ25S,EKMR351VSN122MA50S,EKMR161VSN122MP50S,EKMR161VSN182MR35S,EKMR401VSN331MR30S,EKMR421VSN331MQ45S,EKMR401VSN471MA30S,EKMR451VSN681MA50S,EKMR161VSN102MQ30S,EKMR401VSN471MR40S,EKMR201VSN272MA45S,EKMR421VSN151MP30S,EKMR421VSN391MR40S,EKMR201VSN821MP40S,EKMR351VSN561MR35S,EKMR3B1VSN181MP25S,EKMR3B1VSN221MP30S,EKMR421VSN391MA30S,EKMR181VSN681MQ25S,EKMR181VSN102MP45S,EKMR3B1VSN122MA50S,EKMR421VSN271MQ40S,EKMR351VSN821MA40S,EKMR451VSN271MQ40S,EKMR401VSN121MP25S,EKMR3B1VSN391MP45S,EKMR351VSN331MP45S,EKMR421VSN121MP25S,EKMR351VSN391MR30S,EKMR3B1VSN471MQ40S,EKMR181VSN222MA40S,EKMR251VSN391MP30S,EKMR401VSN681MR50S,EKMR181VSN821MP40S,EKMR3B1VSN271MP35S,EKMR201VSN122MR35S,EKMR201VSN821MR25S,EKMR451VSN561MA40S,EKMR3B1VSN561MR35S,EKMR401VSN681MA40S,EKMR3B1VSN331MQ30S,EKMR421VSN561MA40S,EKMR201VSN102MR30S,EKMR201VSN182MR45S,EKMR401VSN471MQ50S,EKMR181VSN222MA35S,EKMR401VSN221MP35S,EKMR161VSN222MA35S,EKMR251VSN561MP40S,EKMR161VSN272MR50S,EKMR351VSN271MP35S,EKMR161VSN272MA40S,EKMR161VSN122MQ35S,EKMR251VSN152MR50S,EKMR451VSN221MR25S,EKMR161VSN102MP40S,EKMR401VSN331MA25S,EKMR451VSN331MA30S,EKMR351VSN561MQ50S,EKMR251VSN821MQ40S,EKMR451VSN471MA35S,EKMR3B1VSN102MA40S,EKMR181VSN222MR50S,EKMR351VSN221MQ25S,EKMR3B1VSN102MR50S,EKMR421VSN181MP35S,EKMR251VSN152MA40S,EKMR251VSN122MR45S,EKMR421VSN331MR35S,EKMR181VSN152MQ45S,EKMR351VSN681MR45S,EKMR401VSN221MQ30S,EKMR421VSN821MA50S,EKMR□□□VSN□□□M□□□S,EKMR201VSN821MQ35S,EKMR251VSN681MP45S,EKMR3B1VSN471MP50S,EKMR181VSN122MA25S,EKMR401VSN271MR25S,EKMR351VSN821MR50S,EKMR251VSN222MA50S,EKMR421VSN681MA45S,EKMR351VSN271MQ30S,EKMR201VSN102MQ40S,EKMR421VSN221MP45S,EKMR251VSN122MA35S,EKMR451VSN471MR45S,EKMR401VSN331MP50S,EKMR401VSN821MA50S,EKMR161VSN152MQ45S,EKMR351VSN391MA25S,EKMR161VSN152MR30S,EKMR401VSN271MP40S,EKMR161VSN102MR25S,EKMR421VSN181MQ30S,EKMR161VSN182MR40S,EKMR451VSN271MR30S,EKMR161VSN182MA30S,EKMR3B1VSN681MQ50S,EKMR181VSN561MP30S,EKMR351VSN471MQ45S,EKMR401VSN391MQ45S,EKMR181VSN182MA30S,EKMR251VSN561MR25S,EKMR451VSN271MQ45S,EKMR181VSN102MR25S,EKMR201VSN182MA35S,EKMR351VSN681MA35S,EKMR181VSN821MQ30S,EKMR401VSN181MP30S,EKMR201VSN122MQ45S,EKMR251VSN821MQ45S,EKMR351VSN331MR25S,EKMR351VSN151MP25S,EKMR3B1VSN821MA35S,EKMR3B1VSN391MR25S,EKMR451VSN101MP25S,EKMR451VSN561MA45S,EKMR451VSN331MQ50S,EKMR251VSN821MR30S,EKMR3B1VSN331MP40S,EKMR401VSN102MA50S,EKMR351VSN561MR40S,EKMR3B1VSN561MQ45S,EKMR3B1VSN821MR45S,EKMR181VSN182MR40S,EKMR351VSN391MP50S,EKMR251VSN102MR35S,EKMR421VSN271MP50S,EKMR161VSN821MP35S,EKMR251VSN561MQ30S,EKMR351VSN561MA30S,EKMR451VSN271MP50S,KMR,EKMR351VSN331MP40S,EKMR451VSN121MP30S,EKMR201VSN681MQ30S,EKMR3B1VSN471MA25S,EKMR201VSN102MP50S,EKMR181VSN471MP25S,EKMR3B1VSN271MQ25S,EKMR201VSN561MP30S,EKMR181VSN681MP35S,EKMR451VSN181MP40S,EKMR181VSN122MR30S,EKMR401VSN391MR35S,EKMR401VSN561MA35S,EKMR3B1VSN122MA45S,EKMR201VSN152MQ50S,EKMR161VSN152MA25S,EKMR251VSN122MR40S,EKMR181VSN102MQ35S,EKMR181VSN152MR35S,EKMR251VSN681MQ35S,EKMR451VSN151MQ25S,EKMR421VSN151MQ25S,EKMR401VSN561MR45S,EKMR251VSN471MP35S,EKMR451VSN271MA25S,EKMR161VSN222MR45S,EKMR421VSN271MA25S,EKMR451VSN221MQ35S,EKMR421VSN221MQ35S,EKMR401VSN331MQ40S,EKMR451VSN151MP35S,EKMR421VSN561MR50S,EKMR201VSN222MA40S,EKMR451VSN331MR35S,EKMR3B1VSN681MA30S,EKMR161VSN182MQ50S,EKMR201VSN222MR50S,EKMR181VSN222MR45S,EKMR251VSN331MP25S,EKMR421VSN221MR25S,EKMR3B1VSN681MR40S,EKMR401VSN821MA45S,EKMR401VSN271MQ35S,EKMR251VSN102MQ50S,EKMR201VSN122MA25S,EKMR181VSN122MQ40S,EKMR251VSN821MA25S,EKMR421VSN471MA35S,EKMR3B1VSN471MR30S,EKMR161VSN152MQ40S,EKMR421VSN221MP40S,EKMR161VSN821MQ25S,EKMR161VSN561MP25S,EKMR201VSN152MA30S,EKMR421VSN391MQ50S,EKMR251VSN182MA45S,EKMR451VSN221MP45S,EKMR401VSN181MQ25S,EKMR451VSN391MR40S,EKMR421VSN471MR45S,EKMR351VSN102MA45S,EKMR161VSN332MA45S,EKMR181VSN152MQ50S,EKMR451VSN181MQ30S,EKMR351VSN331MQ35S,EKMR451VSN471MR50S,EKMR3B1VSN391MQ35S,KMR SERIES,EKMR201VSN681MP35S,EKMR351VSN221MP30S,EKMR161VSN122MP45S,EKMR201VSN152MR40S,EKMR161VSN681MP30S,EKMR181VSN272MA45S,EKMR421VSN271MR30S,EKMR351VSN391MQ40S

2022/5/9 - NIPPON CHEMI-CON - 数据手册代理服务技术支持现货查询批量订货

KHV 系列基板自立型铝电解电容器

型号- KHV,KHV 系列

2024/10/30 - NIPPON CHEMI-CON - 商品及供应商介绍代理服务技术支持现货查询批量订货

【产品】大容量卡扣式铝电解电容器系列，容值范围100~3300μF

KMR系列是NIPPON CHEMI-CON公司推出的一系列卡扣式铝电解电容器，额定电压为160~450Vdc，主要适用于开关电源，逆变器控制等应用场合。

2018-04-19 - 新产品代理服务技术支持现货查询批量订货

LHX 系列基板自立型铝电解电容器

型号- LHX,LHX 系列

2024/10/29 - NIPPON CHEMI-CON - 商品及供应商介绍代理服务技术支持现货查询批量订货

【选型】根据输入输出平滑应用特性的铝电解电容器选型指导

黑金刚电解电容器虽然主要是作为电源的平滑用途而被广泛使用，但根据用途的不同，在制品选择上的侧重点也不同。本文介绍了根据各种特性选择与其相称的铝电解电容器。

2018-11-28 - 器件选型代理服务技术支持现货查询批量订货

KHE 系列基板自立型铝电解电容器

型号- KMZ系列,KMR,KMW,KHE 系列,KHE,KMZ

2023/4/6 - NIPPON CHEMI-CON - 商品及供应商介绍代理服务技术支持现货查询批量订货查看更多版本

KHV Series LARGE CAPACITANCE ALUMINUM ELECTROLYTIC CAPACITORS Downsized snap-ins, 105℃

型号- EKHV3H1VSN221MP30S,EKHV401VSN301MP40S,EKHV3H1VSN311MQ30S,EKHV351VSN661MA30S,EKHV3H1VSN331MR25S,EKHV351VSN461MP50S,EKHV3H1VSN691MR40S,EKHV351VSN631MA30S,EKHV3H1VSN471MA25S,EKHV351VSN1C2MA50S,EKHV401VSN421MQ40S,EKHV401VSN132MA60S,EKHV3H1VSN611MA30S,EKHV3H1VSN841MR50S,EKHV401VSN351MQ35S,EKHV401VSN541MR35S,EKHV401VSN401MR30S,EKHV3H1VSN241MQ25S,EKHV351VSN122MR60S,EKHV3H1VSN102MA45S,EKHV401VSN931MA45S,EKHV3H1VSN601MQ50S,EKHV401VSN551MQ50S,EKHV401VSN681MR45S,EKHV3H1VSN132MA55S,EKHV401VSN541MA30S,EKHV3H1VSN451MQ40S,EKHV3H1VSN591MA30S,EKHV401VSN411MA25S,EKHV351VSN821MA35S,EKHV351VSN181MP25S,EKHV3H1VSN1A2MA45S,EKHV3H1VSN631MR40S,EKHV401VSN301MR25S,EKHV3H1VSN102MR55S,EKHV3H1VSN381MQ35S,EKHV401VSN841MR50S,EKHV3H1VSN741MR45S,EKHV351VSN351MP40S,EKHV351VSN791MQ60S,EKHV3H1VSN431MP50S,EKHV401VSN441MP55S,EKHV401VSN671MA35S,EKHV351VSN411MQ35S,EKHV401VSN201MP30S,EKHV401VSN341MR25S,EKHV351VSN681MR40S,EKHV351VSN571MR35S,EKHV3H1VSN1A2MR60S,EKHV351VSN102MR55S,EKHV351VSN391MR25S,EKHV401VSN161MP25S,EKHV3H1VSN152MA60S,EKHV3H1VSN521MQ45S,EKHV401VSN1A2MR60S,EKHV401VSN841MA40S,EKHV3H1VSN531MR35S,EKHV401VSN981MA45S,EKHV401VSN491MR35S,EKHV401VSN781MR50S,EKHV3H1VSN1D2MA55S,EKHV351VSN901MR50S,EKHV3H1VSN731MA35S,EKHV351VSN861MR45S,EKHV3H1VSN171MP25S,EKHV351VSN241MP30S,EKHV351VSN1F2MA60S,EKHV401VSN591MR40S,KHV SERIES,EKHV351VSN571MP60S,EKHV351VSN971MR50S,EKHV351VSN331MQ30S,EKHV□□□VSN□□□M□□□S,EKHV351VSN641MQ50S,EKHV401VSN491MP60S,EKHV351VSN721MQ55S,EKHV3H1VSN1B2MA50S,EKHV401VSN1A2MA50S,EKHV351VSN112MA45S,EKHV401VSN641MR40S,EKHV351VSN501MA25S,EKHV351VSN511MP55S,EKHV3H1VSN471MR30S,EKHV3H1VSN941MR55S,EKHV351VSN511MR30S,EKHV401VSN112MA50S,EKHV401VSN871MR55S,EKHV351VSN1B2MA45S,EKHV351VSN112MR55S,EKHV3H1VSN581MR35S,KHV,EKHV401VSN431MA25S,EKHV401VSN1C2MA55S,EKHV351VSN621MR35S,EKHV3H1VSN381MP45S,EKHV401VSN941MR55S,EKHV351VSN981MA40S,EKHV401VSN441MR30S,EKHV351VSN1E2MA55S,EKHV401VSN251MP35S,EKHV401VSN351MP45S,EKHV3H1VSN371MR25S,EKHV3H1VSN451MA25S,EKHV351VSN142MA55S,EKHV401VSN621MQ55S,EKHV351VSN791MR45S,EKHV401VSN122MA55S,EKHV3H1VSN741MQ60S,EKHV351VSN112MR60S,EKHV3H1VSN531MP60S,EKHV401VSN971MR60S,EKHV401VSN681MQ60S,EKHV3H1VSN1E2MA60S,EKHV401VSN142MA60S,EKHV401VSN701MA35S,EKHV351VSN291MP35S,EKHV3H1VSN321MP40S,EKHV3H1VSN671MQ55S,EKHV351VSN741MR40S,EKHV401VSN291MQ30S,EKHV351VSN351MR25S,EKHV3H1VSN911MA40S,EKHV351VSN461MR30S,EKHV351VSN401MP45S,EKHV351VSN162MA60S,EKHV401VSN481MQ45S,EKHV351VSN561MQ45S,EKHV401VSN741MR45S,EKHV3H1VSN801MR45S,EKHV351VSN931MA40S,EKHV351VSN261MQ25S,EKHV3H1VSN481MP55S,EKHV401VSN571MA30S,EKHV3H1VSN271MP35S,EKHV3H1VSN122MA50S,EKHV401VSN221MQ25S,EKHV3H1VSN911MR50S,EKHV351VSN132MA50S,EKHV401VSN801MA40S,EKHV3H1VSN871MA40S,EKHV3H1VSN112MR60S,EKHV351VSN781MA35S,EKHV3H1VSN761MA35S,EKHV401VSN391MP50S,EKHV351VSN481MA25S,EKHV3H1VSN431MR30S,EKHV351VSN491MQ40S

2024/9/25 - NIPPON CHEMI-CON - 数据手册代理服务技术支持现货查询批量订货