【经验】去除和降低隔离开关电源噪声的方法
在恶劣或强电子干扰环境中,比如工业环境和生产装配线等等,在这些系统中,机械设备、高频设备、火花机等等会产出各种干扰和噪声从而影响其它电源的正常工作。出于对净化电源的要求, 比如对电源质量要求比较高的精密仪器设备特别是传感器和微弱信号采集的要求,采用直流隔离电源是普通和常用的办法。
直流(或噪声)隔离电源首先是开关电源,纹波和噪声是它的基本问题。如何有效的减少和降低纹波和噪声是直流(或噪声)隔离电源必须面对和解决的问题。SLKOR将在本文针对这一问题在实验的基础上对去除和降低隔离开关电源噪声的方法做了分析和讨论。图1是一款Flyback隔离电源的原理图,图2给出了500mA电流输出时的噪声测试结果。
图1:Flyback 隔离电源。
图2:噪声测试
如果在隔离的两个电源之间增加一个交流通路,则等效于一个低通滤波器。图3给出了带有交流通路的噪声测试结果。从结果可以看出尖峰和高频噪声被减弱。
图3:带有交流通路噪声测试
LC低通滤波器是降低噪声常用和有效的方法。LC虽然可以有效的去除和减弱纹波但同时也会引入新的噪声,这种噪声主要表现为高频尖峰,其大小与输出电流、LC电感和寄生电容等等有关。
图4:带有LC低通滤波器的噪声测试
在开关电源之后跟随一个线性稳压电源(LDO)同样可以有效的去除和减弱纹波,取决于LDO的性能同样也会引入新的噪声。如图5A/B。
图5A:带有LDO的噪声测试
图5B:带有LDO和交流通路的噪声测试
综上所述,本文讨论了3种去除和降低隔离开关电源噪声的方法,通过这些方法有效的改善电源产品,取得了良好的效果。电源噪声是一个复杂的系统工程,它不仅涉及到噪声理论, 电路设计,电子测量,更依赖于PCB的布板,走线等等工艺过程,这些在此不作讨论。
对于大多数的应用,上述方法基本可以满足,比如数字电路和一般性模拟电路。但对于要求更高的电源比如μV/nA级信号测量,高精密半导体激光器电源和高精度AD/DA转换,仅仅依靠上述方法是不够的。综合多种方法的优化设计可以进一步的改进电源的噪声,图6A/B给出这种电源的测试结果。
图6A超级低噪声电源的噪声测试【8MHz 带宽】
图6B超级低噪声电源的噪声测试【10Hz-100KHz 带宽】
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本文由奶爸工程师转载自SLKOR,原文标题为:隔离电源与噪声,本站所有转载文章系出于传递更多信息之目的,且明确注明来源,不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
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【经验】三种去除和降低隔离开关电源噪声的方法
本文讨论了三种去除和降低隔离开关电源噪声的方法,通过这些方法有效的改善了电源产品,取得了良好的效果。电源噪声是一个复杂的系统工程,它不仅涉及到噪声理论,电路设计,电子测量,更依赖于PCB的布板,走线等等工艺过程。
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SLKOR(萨科微)功率器件/二极管/三极管/电源管理芯片/霍尔传感器/光耦选型指南
目录- 公司简介 场效应管/IGBT单管 单向/双向可控硅 稳压二极管 三极管 运算放大器/达林顿晶体管阵列/整流桥 霍尔传感器 光耦 石英晶体谐振器
型号- BZT52C43S,SS110,MCR00-8,SMCJ440CA,SL11N65CF,MC34063S,ZMM200,PC817,SL2310,SL3400,SL1629SH,SL252030MXXX,RS1A,RS1M,DB107S,GBU4005,1N4148WS,SMF5.0CA,DSK32,SL40T120FL,SL1625SH,MMBT4401,LM317,SL36N120A,SL75T65FL,SL50328MXXX,MMSZ5259B,SL22N120A,SL2301,BT151,GBP210,SL2302,BT169D,SL49SM8M20P-20,1SMB5921B,SL1613SH,S2MF,SL49SM12M20P-20,2N7002,SL201624MXXX,BTA26-800,SL322540MXXX,S3AB,SL4949,GBU610,BFG520,SL252016MXXX,BZT52B2V4,BZT52B43,SL1605SH,ZM4727,1SMA4777A,SL1609SH,BTA41-800,GBU6005,SL21N65CF,SL25T120FL,BTA24-800,SD05C,SL4275,ULN2003,SL1613TH,ES2A,SS525,6N137,6N136,SL15N65CF,WE05DF-BS,ULN2803,BT138-800,2SC3357,SL78LXX,LM2575,6N135,ZMM2V0,LM2576,BZT52C2V4S,US1A,SMF5.0A,SMAJ170A,SL10N120A,S5MB,RS2A,RS2M,MMBT5551,US1M,SL80N120A,S8550,S2AF,SMBJ5.0C,M1,SS22,BSS123,M7,SS310,ABS210,MMBT3904,MMBT3906,SMF58CA,BT137-800,MM1Z39B,ABS201,SMCJ440A,SMAJ5.0CA,BTA12-600,BAV99,SS32,SMBJ5.0,SL1623SH,SMBJ170CA,SL201612MXXX,BSS138,SL322512MXXX,1SMB5956B,ES2J,FR101,SS12,SL3N170AP,1SS181,FR107,SMF58A,78MXX,SL50T65FL,SM15C,SL1619SH,LL4148,MM1Z2V2B,SMAJ5.0A,MMBTA05,SL14N120A,BC817,SS8050,DB201S,SL1615SH,S1A,LM321,S5AB,SMCJ5.0CA,DSK310,GBU410,SS210,BCP51,SL40T65FL,BCP53,S8050,S1M,B772,SMBJ170A,SL28N65A,MMBT2222A,SLM601,BTA16-800,AMS1117-XX,ZM4761,TL431,SS52,NUP2105LT1G,DB101S,SL322524MXXX,SL1603SH,IRF640,SD12C,S9013,GBP2005,SL3407,BZT52C39,SL7N65CD,SMCJ5.0A,BZT52C2V4,SL50N120A,S3MB,MMSZ5221B,SS8550,SL3415,SMAJ170CA,GBLC05CI,BAV21W,DB207S,LM358S,SL80N65CT,1SMA4728A
The Ideal Replacement/Alternative Equivalent Solution for ST BTA16-800BWRG - SLKOR BTA16-800B
With its multiple advantages, the SLKOR bta16-800b has become the ideal substitute for the STMicroelectronics BTA16-800BWRG, offering a better option for the development and innovation of the electronics industry.
SLKOR-霍尔传感器选型表
SLKOR提供如下参数的霍尔传感器选型,VDD(V):1.6~5.5,IDD(A):1.6及3.3,FO(Hz):5和20及多种封装形式,如SOT-23,TO-92S和SOT-523不等
产品型号
|
品类
|
Polarity
|
VDD(V)
|
IDD(A)
|
TA(℃)
|
BOP(Gs)
|
BRP(Gs)
|
FO(Hz)
|
Output Type
|
Package
|
SL1603TH
|
霍尔传感器
|
全极
|
1.6~5.5
|
3.3
|
-40~85
|
±46
|
±34
|
20
|
CMOS
|
SOT-23
|
选型表 - SLKOR 立即选型
SLKOR-可控硅选型表
SLKOR提供如下参数的可控硅选型,Vᴅʀᴍ(V):400~1600,Iᴛ₍ʀᴍs)(A):0.8~80,Vɢᴛ(V):0.7~1.5及多种不同的封装选择,如TO-220,TO-3P和ITO-247不等
产品型号
|
品类
|
Vᴅʀᴍ(V)
|
Iᴛ₍ʀᴍs)(A)
|
Iɢᴛ(μA)
|
Vɢᴛ(V)
|
Tᴊ(℃)
|
Package
|
MCR100-6
|
单向可控硅
|
400
|
0.8
|
≤200
|
0.7~0.8
|
125
|
TO-92/SOT-23
|
选型表 - SLKOR 立即选型
SLKOR稳压二极管MM1W18,稳压范围16.8至19.2V,额定功率高达1000mW
在电子电路中,稳压二极管作为关键的电压保护元件,扮演着至关重要的角色。MM1W18作为一款高性能的稳压二极管,凭借其出色的稳压性能、高功率承受能力和极低的反向电流,成为了众多电子工程师的必选器件。本文SLKOR将详细介绍MM1W18的产品概述、性能特点、应用领域、市场前景以及故障预防措施,为读者提供全面的了解和参考。
SLKOR三极管选型表
SLKOR提供如下参数的三极管选型,Iᴄ(A):-3~5;Vᴄʙᴏ(V):-500~700,Vᴄᴇᴏ(V):-400~450及多种不同的封装尺寸,如:SOT-23,SOT-363和SOT-89不等
产品型号
|
品类
|
Polarity
|
Iᴄ(A)
|
Vᴄʙᴏ(V)
|
Vᴄᴇᴏ(V)
|
Vᴇʙᴏ(V)
|
Vᴄᴇ(sat)(V)
|
Package
|
S8050
|
三极管
|
NPN
|
0.5
|
40
|
25
|
5
|
0.6
|
SOT-23/TO-92
|
选型表 - SLKOR 立即选型
Slkor萨科微18V稳定电压值的稳压二极管MM3Z18,广泛应用于信号限幅电路等领域
萨科微稳压二极管MM3Z18的总功耗最大值为300mW。表明该二极管在正常工作条件下可以承受较大的功率负荷,适用于需要处理较大电流的电路。该器件采用了适用于表面安装设计的小型塑料封装。表面安装技术(SMT)是现代电子制造中广泛使用的一种技术,具有组装密度高、可靠性高、抗振能力强等优点。小型塑料封装则意味着二极管占用空间小,便于在集成度高、空间有限的电路板上安装使用。
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满足150W内适配器、PD快充、氮化镓快充等主流产品测试需要;并可查看被测开关电源支持协议,诱导多种充电协议输出,结合电子负载和示波器进行高精度测试。测试浪涌电流最大40A。支持到场/视频直播测试,资深专家全程指导。
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可定制平板变压器、主变压器的开关频率2MHz以内、输入电压1400V以内、输出电压1400V以内,50%以上的产品采用自动化生产,最快3天提供样品、7天交货。
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