【经验】如何计算反激式开关电源的输出电容参数？
在反激式开关电源的设计中，输出电压纹波的大小将直接影响着负载电路的供电稳定性，减小纹波最有效的方法就是滤波电路，可通过电抗器和电容器来实现，输出电容的作用是滤除电流纹波使之变得平滑趋于直流的恒流特性，理论上容量越大滤波效果越好，但容量太大就变成了容性负载，所以要匹配起足够的负载工作就可以了。
如上图所示，L1和C1构成了一个滤波电路，其中C1就是输出电容，下面将通过一个实际需求进行输出电容的参数计算；
要求：为一个输出电压Vo=12V，输出功率为Po=24W的反激式开关电源选择一款合适的输出电容，使得输出电压纹波Vp-p小于100mV，其中开关电源的主频率为f=100kHz；
首先根据Vo、Po得出输出电流值Io=Po/Vo=2A，然后再根据纹波电流的要求，即Vp-p=Z*Io，得出输出阻抗Zo=Vp-p/Io=50mΩ；
其中输出阻抗Zo由输出电容的ESR及在电路中表现出的容抗Xc两部分组成，即Zo=Xc+ESR，根据经验值，可以将2/3的总阻抗分配给ESR，其余的1/3分配给容抗Xc，由此可得出ESR=2/3*Zo=33.33mΩ，Xc=16.67mΩ；
根据Xc=1/(2π*f*C)得出输出电容的容值计算公式C=1/(2π*f*Xc)=95.52uF，可根据实际情况选择100uF的电容；最后再进行耐压值的选择。
在12V的输出电路中，理论上选择16V耐压值的电容即可，但是为了保证在使用时突发状况下的安全性及使用寿命，推荐使用耐压值为25V的电容。这样我们就完成了整个输出电容参数的设计计算，即电容量C=100uF、ESR＜16.67mΩ，耐压值Vr=25V。
世强代理的KENDEIL品牌电解电容，高品质，低ESR，是开关电源输出电解电容的优秀选择，且其高耐压，纹波电流高达100A，在85℃工作温度下，寿命长达10万小时的优良特性可以满足各种工况下的高标准电容要求。
通过上面的介绍相信大家已经掌握了反激式开关电源的输出电容的设计计算方法，如有问题可留言互动交流或联系世强400-887-3266。
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目录- COMPANY PRESENTATION TECHNICAL INFORMATION CAPACITORS ACCESSORIES
型号- 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
Kendeil aluminium electrolytic screw type capacitors PRODUCT CHANGE
型号- K91,K71,K92,K61,K72,K42,K41,K11,K22,K21,K02,K01,K04,K03,K07
【产品】小型化尺寸的铝壳防浪涌电容器K93＆K94，具有低ESR特性，最大电容值为15000μF
肯德尔通过将低ESR与小型化尺寸这两个特点结合起来，推出了最新的螺钉端子类型系列的电解电容器：K93和K94。专为专业/工业应用而设计，如开关电源，高纹波电流转换器，电机驱动器。
产品 发布时间 : 2022-12-28
钽电容的漏电流是不是相比电解电容小很多？一般是多大的？电解电容的漏电流呢？
恰恰相反，一般情况钽电解电容比电解电容漏电流大些，一般的漏电流为0.04 Cr Vr μA，其中漏电流IL= K* Cr Vr，单位是μA，K是常数，不同厂家K值的标定也不一样，世强代理的Kendeil 铝电解电容漏电流ILmax= 0.003 Cr Vr μA，K值为0.003，同类产品已经是非常小的了。
技术问答 发布时间 : 2017-09-20
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整体外形尺寸小至0.6*0.3*0.3mm (DFN0603)，工作电压范围覆盖2.5V~36V，电容值低至0.2pF，浪涌能力最高可达240安培，静电等级可达空气放电、接触放电±30KV。提供免费浪涌测试仪、静电测试仪测试。
提交需求>
可定制OGS一片式电容屏，G+G电容屏，G+F电容屏，G+F+F电容屏，尺寸范围：1”~21”，单层产品厚度：0.55mm~2mm，可按客户要求在产品上附加防反射，防指纹，多色丝印，钻孔磨边，2.5D导圆角等工艺。
最小起订量： 1000 提交需求>
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