【成功案例】怎么设计和选型开关电源输出π型滤波器,降低电源输出纹波噪声
开关电源在带载运行时,由于MOSFET开关管的开关频率很高,会造成很高的电压尖峰和噪声纹波,电源输出噪声纹波过大的话,会造成输出负载的功率损耗和电压波动,严重者超过负载的电压承受范围使其损坏。那怎么才能设计和选型合适的滤波器降低电源输出纹波噪声?
本文结合开关电源设计项目为例,采用LAIRD公司的功率电感1XC0394-1T0-10和电解电容设计电源输出π型滤波器,降低电源输出纹波噪声,减少电磁干扰,为负载提供良好的功率电压环境。图1为电源输出π型滤波器原理图:
图1电源输出π型滤波器原理图
开关电源输出的正极经过滤波电感输出+15V,电解电容C20、C21,电感L5和无极性电容C22组成π型滤波器,为+15V输出电压滤波,降低电源输出纹波和噪声;发光二极管DL1B和电阻R27作为电源输出的指示灯,可以判定电源电压是否正常输出。
在本文结合开关电源设计项目中,电源输入电压额定值为110V,电源输出为+15V,开关频率为150KHz,最大输出功率为150W,输出电压纹波要求小于0.5V,满足-25℃~85℃环境工作温度范围。结合开关电源设计项目需求,按照以下步骤进行π型滤波器的选型设计:
1、计算π型滤波器电感值;
2、选择π型滤波器电感的额定电流;
3、选择π型滤波器电感的额定内阻;
4、选择π型滤波器电感的封装和工作温度范围。
1)计算π型滤波器电感值
开关电源项目输出功率为150W,开关频率为150KHz,所用效率90%,计算π型滤波器的截止频率25KHz。采用归一化LPF低通滤波器设计方法,特征阻抗为1Ω,且截止频率为1/(2π)的基准低通滤波器的数据,按照图2计算公式计算出π型滤波器的电感值范围为大于7.5uH。
图2电源输出π型滤波器计算公式
2)选择π型滤波器电感的额定电流
电感的额定电流为电感长时间运行时额定工作值,代表了电感的通流能力大小,开关电源的最大工作功率为150W,输出电压为15V,因此电感的额定工作电流最小为10A。
3)选择π型滤波器电感的额定内阻
电感的内阻DCR能够消耗电感流过电流的能量,内阻越大,电压输出压降越大,消耗功率越多,发热越严重。开关电源设计项目中,电压输出为15V,输出电压纹波要求小于0.5V,因此电感的内阻DCR必须小于0.05Ω。
4)选择π型滤波器电感的封装和工作温度范围
开关电源设计项目,需要满足高温70℃运行6h,85℃下运行15min的高温试验,因此选择电感必须能够在环境温度为85℃下长时间运行,并且要工作温度范围宽,从而能够降低由于系统发热带来的故障风险。要求其封装形式为插针或者贴片封装,占用PCB空间小,适合PCB焊接使用。
针对开关电源设计项目中对π型滤波器电感的上述设计要求,本文项目之初选择两家电感厂家Laird公司和Pulse厂家的产品参数进行对比,以便选择出合适项目用的π型滤波器电感。
图3两家电感参数对比
通过Laird公司的1XC0394-1T0-10与PULSE公司的PA4344.153NLT的参数对比可以得出:
1、电感1XC0394-1T0-10与PA4344.153NLT额定电流和工作温度参数相同,都能满足项目中额定电流大于10A和环境温度大于85℃的设计要求,并且留有裕量,可以避免输出功率波动带来的发热问题。
2、电感1XC0394-1T0-10与PA4344.153NLT电感量都大于项目中7.5uH的要求,两者峰封装形式不同,但插针和贴片封装都体积不大,不会占用PCB太大面积。
3、电感1XC0394-1T0-10相对于PA4344.153NLT的最大优势是内阻小,相对小了9.3mΩ,按照最大输出电流10A计算,少发热功率为0.93W。因此电感1XC0394-1T0-10内阻小,发热量和损耗功率小,使得开关电源的效率更高,而且能够降低温升带来的热故障,使得开关电源运行更加稳定。
综上通过两款电感产品参数对比分析,可见Laird公司的电感1XC0394-1T0-10各项参数都满足开关电源π型滤波器电感的设计需求,而且其最大优势是内阻小,性能优越,在开关电源可靠有效的使用。
图4电源输出π型滤波器测试波形
开关电源设计项目中,采用Laird公司的功率电感1XC0394-1T0-10设计电源输出π型滤波器,降低电源输出纹波噪声,减少电磁干扰,为负载提供良好的功率电压环境。而且电感1XC0394-1T0-10的最大优势是:内阻DCR特别小,只有0.0085Ω,输出电压压降小,消耗的功率也小,发热也小,非常适合开关电源项目中出输出滤波电感使用。
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产品 发布时间 : 2024-11-06
【选型】Laird(莱尔德) 完整的EMI及导热选型指南
目录- 导热垫片 导热硅脂T-grease 导热电绝缘材T-gard 相变材料T-pcm EMI材料
型号- 5000,TPCM 920,3000,210,TPCM200SP,2500,T-PUTTY502,TPCM910,TPCM588,TPCM583,TPCM780,K52,TPCM5816,TPCM905C,880,T-FLEX200VO,980,T-FLEX600,300X,1500,TPCMHP105,T-FLEX500,500,228,T-PLI-200
【选型】Laird(莱尔德)微波射频吸波材料选型指南(中文)
目录- ECCOSORB微波吸波材料 ECCOSORB腔体谐振 ECCOSORB远场环境 ECCOSORB近场环境 ECCOSTOCK低损耗低介电常数 微波射频吸波材料参考范例
型号- PP,ECCOSORB JCP PBT 252,ECCOSTOCK,LS,ECCOSORB CRS,HR,ECCOSTOCK HIK500F,ECCOSORB JCS,ECCOSORB MF-PP,FFP,ECCOSORB QR-13AF,0005,ECCOSORB SF,ECCOSTOCK 0005,FLEX LOK,GDS,MF,ECCOSTOCK PP,ECCOSORB 5GMEF1,ECCOSORB FGM,BSR,QR-13AF,ECCOSTOCK SH,MMI,LOK,AN,FGM,ECCOSORB MF-PPS,ECCOSORB AN,MF XX,JCS,ECCOSTOCK HIK,5GHIF1,ECCOSORB MF-TPE,ECCOSTOCK FLEX-LOK,ECCOSORB CFS-8480,ECCOSORB MCS,ECCOSORB MF500F,CFS,ECCOSORB,MF500F,SF,ECCOSTOCK FFP,SH,ECCOSORB HR,ECCOSTOCK LOK,ECCOSORB LS,ECCOSORB MF-PA,ECCOSORB MMI,NS1000,5GMEF1,ECCOSORB BSR,HIK,CR,ECCOSORB GDS,JCP PBT 252,ECCOSORB 5GHIF1,ECCOSORB CR,NS 1000,MCS
解析开关电源的工作原理及特性
开关电源(Switching Power Supply, SPS)通过将输入电源转换为所需的输出电压和电流,使用开关元件来调节电流,并利用电感和电容进行滤波和稳压。本文TOPPOWER详细介绍了开关电源的工作原理及特性。
技术探讨 发布时间 : 2024-08-30
【选型】Laird(莱尔德) 电感选型指南
目录- 电感部件号命名法说明 铁氧体EMI贴片磁珠 Ferrite EMI表面贴装技术(SMT)磁珠总成 共模和差模说明 共模扼流圈系列 共模扼流圈 低频共模扼流圈 共模阵列 CAN-BUS共模扼流圈系列 程数和匝数 绕线式SMT功率共模扼流圈 绕线式DIP功率共模扼流圈 共模扼流圈系列 差模EMI滤波器 EMI滤波器阵列 差模滤波器等效电路 铁氧体贴片电感 多层功率贴片电感
型号- LI1806E800R-10,CPI1008K1R5R-10,LF1206A302R-10,28C0236-0JW-10,LI0402E800R-10,HZ0603C601R-10,HI0805P390R-10,MI0805K601R-10,IC1206B821R-10,MI1206L501R-10,HZ0603B751R-10,IC0603B820R-10,MI0805L301R-10,LI0603E151R-10,IC0805B222R-10,CM 41,LF1206E152R-10,CMX1211Z601B-10,MI0603J601R-10,CM 45,CM 44,CM0805A371R-10,28L0138-80R-10,HZ0805D102R-10,IC0805B102R-10,HI2220R181R-10,CM1812C282R-10,29F0428-0T0-10,29F0430-2SR-10,CM0805B361R-10,CF BEADS,CM5740Z171R-10,MI0805K110R-10,CM0805C161R-10,CM2824E352R-10,MI0603L221R-10,IC0805A333R-10,CM5740Z171B-10,CM2021Y330R-10,29F0818-0SR-10,LI0402E190R-10,CMX1616Z401B-10,IC0805A472R-10,CM4440Z121R-10,HZ0402A152R-10,HZ0603A102R-10,CPI0806KR68R-10,MI0402L100R-10,IC0603A152R-10,HI1206T500R-10,CMX1616Y222B-10,LI0805H151R-10,CM 21,HZ0603A222R-10,MI0603K300R-10,CM3032V201R-10,MI0805K400R-10,CM5740Z241B-10,MI1206K260R-10,CH 05,DA1206D301R-10,CM1206A601R-10,CPI0805F2R2R-10,HI0805P121R-10,MI1206L601R-10,MI0603J102R-10,28L0138-10R-10,HR2220P601R-10,CMX1616Z162B-10,28L0138-40R-10,HZ1206C202R-10,IC0603A821R-10,CM3822R201R-10,IC0603B181R-10,HI0603R300R-10,IC0805A223R-10,IC1206A103R-10,CPI0806J1R0R-10,CM4732V301R-10,MI0402K121R-10,HI2220P251R-10,29F0418-0SR-10,MI0805M221R-10,35F0121-1SR-10,CMX1211Z181B-10,HZ0402A182R-10,HZ1206E601R-10,CM 22 ARRAY,CMX1616Z112B-10,CPI1008KR82R-10,CF0805D670R-10,LF CM,HI0805Q310R-10,IC0603A102R-10,CM 05,MI0603K181R-10,MI0603J600R-10,CC2824E513R-10,CM3440Z171B-10,HI1612X560R-10,IC0805A821R-10,HI0805O121R-10,HI2220Q401R-10,MI0603J471R-10,HI0603N330R-10,CMX1211,CMX1616Z171B-10,HZ0402A601R-10,IC0805A183R-10,HZ0402B102R-10,HI0805R121R-10,CM3440Z171R-10,CM4545Z131R-11,CM4545Z131R-10,CH0805D900R-10,LI0603G121R-10,HZ0603D102R-10,CM3822R151R-10,CPI0805H1R2R-10,CPI1008K1R2R-10,LI0402E300R-10,LI0402E750R-10,CM2824E182R-10,IC0603B470R-10,28C0236-0EW-10,LI1812D121R-10,CM3032V121R-10,29F0430-4SR-10,IC1206B153R-10,CPI0806J1R8R-10,LI1206H151R-10,CM4545Z131B-10,HZ0603C651R-10,HI0805T500R-10,CC2824D225R-10,IC0805B331R-10,CF0504C121R-10,CMX1211X132B-10,29F0818-1SR-10,CC1812,LI0603G221R-10,LI1806C151R-10,CF0805D900R-10,HZ0805B252R-10,CPI0806KR82R-10,CC2824E105R-10,IC0805A272R-10,MI1206L391R-10,CMX1211Z321B-10,CM5441Z101B-10,CPI1008J4R7R-10,LF0805A252R-10,IC1206A333R-10,HR2220V801R-10,IC0805C680R-10,LI1806E101R-10,HZ0603A182R-10,LI0402B800R-10,28C0236-0BS-10,CM5022R201R-10,MI0805L601R-10,CF0805C221R-10,CC2824E253R-10,CC2824J502R-10,CPI0805G1R5R-10,CM2722R201R-10,HI0603O700R-10,LI0402C470R-10,IC0603A182R-10,29F0330-2SR-10,CPI0805E4R7R-10,CM2545X171R-10,HI2220P171R-10,29F0528-0T0-10,MI0603M121R-10,HZ0805G471R-10,HZ1206D102R-10,LI0603D301R-10,CM0805D900R-10,IC0603A103R-10,IC0805A822R-10,MI1206K900R-10,CM3822R800R-10,CM4732V201R-10,CC2824E474R-10,HI1806N910R-10,28F0181-1SR-10,CC2824E113R-10,CM5022R151R-10,HI1206T161R-10,LI0805H400R-10,HI2220R151R-10,CM2824B103R-10,CPI0805H1R0R-10,LI0805G201R-10,CPI1008K1R0R-10,MI0603L301R-10,DA1206E300R-10,IC0805A153R-10,CPI1008J2R2R-10,LI0402E600R-10,HI3312X101R-10,CM3032V301R-10,MI1806J800R-10,HI1206N800R-10,MI0805L331R-10,HZ1806K102R-10,CM 40 ARRAY,CPI0806J1R5R-10,HZ0603B471R-10,IC0603A681R-10,CM2545X171B-10,HZ0805E601R-10,HI0805N600R-10,CPI0805JR47R-10,HZ0603B102R-10,CM0805B501R-10,HZ0805B272R-10,29F0418-1SR-10,IC0805B332R-10,LI0805G301R-10,MI0805J102R-10,HI2220R301R-10,LI0603B201R-10,HZ0603A252R-10,CM2824E702R-10,IC0603A472R-10,LI0402C221R-10,LI0805H121R-10,HI0805N310R-10,HI1806T600R-10,HI2220T101R-10,CPI0806KR47R-10,28C0236-0DW-10,DA1206D600R-10,CM0805C221R-10,CC2824,29F0303-0T0-10,CPI0806J3R3R-10,HZ1206E152R-10,MI0603K471R-10,CC2824B475R-10,HI2220P701R-10,CC2824E471R-10,28L0138-70R-10,CPI0805E3R3R-10,DA1206B601R-10,CM0805C601R-10,IC1206B331R-10,CPI0805G1R8R-10,35F0121-0SR-10,CM5441Z161B-10,CM1206C161R-10,HZ0805D152R-10,28C0236-0BW-10,IC1206A332R-10,CPI0806J1R2R-10,CPI1008KR68R-10,HI2220P601R-10,CPI0805JR68R-10,MI1812K121R-10,CM 32 ARRAY,HI0805R800R-10,IC0805A681R-10,CMX1616X282B-10,HI1206N680R-10,HZ0603B112R-10,HI2220P551R-10,CC1812C513R-10,CPI1008K1R8R-10,CM5022R800R-10,CMX1211Y801B-10,LI0402B301R-10,28L0138-50R-10,HI0805N221R-10,28F0121-1SR-10,IC0805C470R-10,LF1206C202R-10,CPI0805IR82R-10,DA1206B102R-10,IC1206A472R-10,MI1206K601R-10,CM6032V201R-10,HI0603N300R-10,HZ0603A152R-10,CM4440Z111R-10,HI0603P600R-10,HZ0603C152R-10,LI0603G800R-10,IC0805B101R-10,CM5441Z161R-10,CMX1211Z680B-10,HI1812T800R-10,MI0603J680R-10,28F0121-0SR-10,HZ0805C202R-10,CM6032V301R-10,CPI0806J2R2R-10,CM3421Y600R-10,CPI0806J4R7R-10,HI1206N101R-10,LI0402D121R-10,LI0805H750R-10,29F0328-0T0-10,DA1206C121R-10,MI1206K310R-10,LI0402C220R-10,HR2220V701R-10,CM2722R151R-10,IC0805A103R-10,CPI1008KR47R-10,CM2722R800R-10,LI1206H121R-10,CMX1616Z701B-10,CF0504C900R-10,HI2220P271R-10,CF0805D121R-10,CPI1008J3R3R-10,IC1206B183R-10,LI0603E470R-10,CMX1211W182B-10,IC0805B182R-10,HI1206P121R-10,HI1812V101R-10,29F0429-0T0-10,IC0805B122R-10,HZ0805B222R-10,MI1210K600R-10,29F0318-1SR-10,CF0805D181R-10
【选型】Laird(莱尔德) 磁珠/磁环选型指南(中文)
目录- 铁氧体材料阻抗对比 设计和选择的经验法则 高频柱状磁芯 高频分离,可拆卸磁芯 宽带柱状磁芯 宽带分离,可拆卸磁芯 宽带磁芯参考图表 低频柱状磁芯 宽带带状可弯曲线缆磁芯 宽带可拆卸带状和弯曲线缆磁芯 铁氧体 EMI 圆盘和方盘 用于无线充电的铁氧体板 柔性铁氧体片 磁芯样本套件列表
型号- 28B1225-000,28S2022-0M0,MHLL5040-000,28B0390-200,28R0592-010,MP1040-300,MSLL5040-200,28B0375-000,HFB143064-000,28R0610-000,28S2011-0P0,28R0852-500,MHLL6060-300,28B0592-000,28R1775-000,28A2024-0A0,28A2024-0A2,28R1953-000,LFB259128-000,28B0591-200,28A5131-0A2,28B1000-000,HFB170070-100,MP2170-1M0,28R1236-000,28R2170-000,28R0315-200,MULL6060-300,28B0250-100,28B1225-100,28R0480-000,28B0870-100,28R1518-000,28A2307-0A2,28B0734-000,28B0375-100,28B0999-000,LFB310190-000,HFB143064-100,28B0394-000,28B0315-100,28R1127-200,MP1040-200,MULL5040-000,28R1340-200,28B0629-000,HFB123049-000,28A0640-0A,HFB075024-000,28B0452-000,28R0614-100,28S2011-0M0,28A2809-0A2,28S2827-210,33P3839-0M0,HFB150070-200,28B0157-100,28A2025-0A,MSLL12060-000,28R1418-000,HFA150068-0A2,MM0650-100,HFB170070-000,28B0631-000,28R0900-100,28A3851-0A2,28R1779-000,28B0339-000,MHLL,28B1250-000,28R0480-100,28R2000-200,28A0434-0A2,28R1417-000,28R1240-010,28A0807-0A2,MP0433-000,HFB0473-200,HFA163090-0A2,28B0315-000,28B0625-000,MP1040-100,28R1340-100,33P2098-0M0,HFB123049-100,28A2025-0A2,28B1540-000,28A2738-0A2,28B0384-000,LFB143064-100,28R1261-100,28B0886-20H,28B0563-100,MP1496-000,28R0492-100,28R1227-100,28R0669-000,28S2022-0P0,28A2025-0A0,28B0631-100,28R0898-100,28A1507-0A2,HFB157070-000,LFB159079-000,28R1450-100,MP0315-200,28B0395-000,28B1225-300,28S0670-000,28B0485-000,28B1020-100,28B0625-100,28R1101-000,MULL12060-200,28R1127-000,28B0562-300,28R1022-000,28R1517-000,HFB259128-100,MP0350-000,28R1476-100,MULL5040-200,HFA100049-0A2,28B1142-100,28R0614-300,28B0686-000,28R0983-000,28A2432-0A2,28B0570-000,LFB143064-000,28A0640-0A2,LFB250150-000,28A0392-0A,28B0563-200,28B0141-000,28B0453-000,28A0350-0B2,LFB090050-000,HFA259131-0A2,28A0640-0A0,28A2029-0A2,MSLL12060-200,MSLL6060-300,28A2029-0A0,28S2001-0,28R1102-100,28B0268-000,28A2913-0A2,HFB160093-300,28B0470-000,LFB220140-000,MULL,28R1319-000,MP0591-200,HFB095051-200,28S2001-0P0,HFA187102-0A2,28B0773-050,HFB152034-000,28A2026-0A2,28B0375-400,28S2012-0M0,28B0384-200,28B0472-090,28R1127-500,28B0473-200,28R3149-000,28B0562-200,28B0735-300,28B0616-000,MP1496-0M0,28B1142-000,MP0512-200,28B0686-100,28B0825-000,MHLL12060-200,HFB123049-300,28R0945-000,28A0593-0A2,28B0474-000,28A5776-0A2,28R1457-400,28R0880-000,28R0453-200,LFB180100-000,28B2000-100,28B0250-700,28B0590-000,28B0500-100,LFB290190-000,28R1102-000,28R0756-000,28S2001-2A2,28A0392-0A0,28A0392-0A2,28R1862-000,MM0787-200,28R0984-000,MULL12060-000,HFA150066-0A2,28A4155-0A2,28B0672-000,28B0296-000,28S2011-0,28B0562-100,28B0686-200,28B0473-000,MP3940-0M0,28R1261-200,28R0453-300,28B0563-000,28R1025-000,MP2106-0M0,28B1122-100,28R0898-200,HFA100035-0A2,HFB159079-100,28S2022-0,LFB127079-000,28R1262-000,LFB360230-300,MSLL,MM1400-300,28A2029-0A,28B0870-000,MHLL5040-200,MM0787-100,28R2170-100,HFB143064-200,MSLL5040-000,MP1040-3M0,28B0275-000,28A0592-0A2,LFB095051-000,28R1128-100,28B0562-000,28B2400-000,MHLL12060-000,MP2126-0M0,HFB187102-100,28R1779-100,28S2001-0M0,28A2736-0A2,MP0590-200,28R1141-010,MP0760-100,28B0500-300,HFB160093-200,MM1400-200,LFB187102-000,28R0756-200,28R1103-000,HFB095051-100,28A3039-0A2,28B0434-000,28B0375-300,28R0984-200,28B1531-000,28A2024-0A,28A2005-0A2,28R1127-400,HFB100035-000,28R1128-200,28B1417-200,28B0735-000,HFB143064-300,28R1024-000,28B0355-000,28R1654-010,28B1122-300,28R0825-000,28S2023-0M0,LFB174095-000,28R1496-000,28R1262-200,28R0394-000
关于开关电源常见的故障及解决办法
开关电源作为一种电源转换设备在生活中随处可见,而一般人很少会知道它的基本常识和作用有哪些。开关电源是一种小型便携式电源转换设备,一般由外壳、开关、电源变压器和整流电路组成。可分为交流输出型和直流输出型,一般有插墙式和桌面式两种类型。 当在开关电源的使用当中,久而久之出现一些故障也是在所难免的,本文将分享开关电源使用中常见故障和解决办法。
设计经验 发布时间 : 2024-08-28
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可定制射频隔离器/环行器(10M-40GHz),双工器/三工器(30MHz/850MHz-20GHz),滤波器(DC-20GHz),功分器,同轴负载,同轴衰减器等射频器件;可定制频率覆盖DC~110GHz,功率最高20KW。
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使用FloTHERM和Smart CFD软件,提供前期热仿真模拟、结构设计调整建议、中期样品测试和后期生产供应的一站式服务,热仿真技术团队专业指导。
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