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调速器|开关电源直流EMI滤波器的设计
发布时间 : 2018-06-06 10:17 浏览量 : 64

电子技术的迅速发展,对电子仪器和设备提出了更高的要求:性能上,更加安全可靠;功能上,不断增加;使用上,自动化程度越来越高;体积上,要日趋小型化。这使得具有众多优点的开关电源在计算机、通信、航天、彩色电视等方面得到了日益广泛的应用。但是,在开关稳压电源中,开关管工作在开关状态,其交变电压和电流会通过电路的元器件产生很强的尖峰干扰和谐振干扰。这些干扰严重地污染了市电电网,影响了邻近电子仪器及设备的正常工作;同时,由于这一缺点,使得开关电源无法应用于一些精密的电子仪器中,因此,尽量降低开关电源的电磁干扰,提高其使用范围,是从事开关电源设计必须考虑的问题[1]。

LVBOQIDESHEJIJISHIXIAN" onclick="get_larger(this)" src="http://files.chinaaet.com/images/20100914/73c6d3bc-47d8-4002-8b0a-45e227c8abf2.jpg" />

  BENWENYINGYONGLEERDUANKOUWANGLUODEYUANLI,DUIKAIGUANDIANYUANZHONGZHILIUEMILVBOQIJINXINGLEFENXI,JICHULEZHILIUEMILVBOQISHEJIDEYIBANFANGFAJIXIANGGUANCANSHUDEJISUANFANGFA。

  1 JIYUERDUANKOUWANGLUOZHILIUEMILVBOQIDESHEJI

  MUQIANGUANGFANSHIYONGDEKAIGUANDIANYUAN,WULUNDANQIAOSHI、TUIWANSHI、BANQIAOSHI、QUANQIAOSHIDOUKEYIGUINAWEITU1SUOSHIDEXINGSHI[2](YIDANXIANGWEILI)。

  YOUTU1KEYIKANCHU,TONGGUODUIZHILIUEMILVBOQIDEPEIZHI,KEYIGAIBIANDIANLUDEDENGXIAOZUKANG,JINERDADAOYUQIDELVBOXIAOGUO。

  ZHILIUEMILVBOQISHUANGDUANKOUWANGLUOMOXINGRUTU2SUOSHI。QIHUNHECANSHUFANGCHENGWEI

 

  SHIZHONG:g11WEISHURUDAONA;

  g22WEISHUCHUZUKANG;

  g12为反向电流增益

  g21WEIZHENGXIANGDIANYAZENGYI。

  YOUSHI(1)KEYIDENGXIAOCHURUTU3SUOSHIDEYUANLITU。

 

  ZHILIUEMILVBOQISHEJIBIXUMANZUYIXIAJIXIANGYAOQIU:

  1)YAOBAOZHENGLVBOQIZAILVBODETONGSHI,BUYINGXIANGDIANYUANDEDAIFUHENENGLI;

  2)DUIYUSHURUDEZHILIUFENLIANG,YAOQIULVBOQIJINLIANGBUZAOCHENGSHUAIJIAN;

  3)DUIYUXIEBOFENLIANG,LVBOQIYAOYOULIANGHAODELVBOXIAOGUO。

  JIEHEHUNHECANSHUFANGCHENGJIDENGXIAOYUANLITU,YOUYAOQIU1)ZHI,LVBOQIDESHURUDAONAHESHUCHUZUKANGYAOJINKENENGXIAO,JIg11=g22=0

 

  YOUYAOQIU2)ZHI,DIPINSHI,FANXIANGDIANLIUZENGYIg12HEZHENGXIANGDIANYAZENGYIg21SHEJIZHIYAOJINLIANGWEI1,ERSHURUDAONAHESHUCHUZUKANGYAOJINKENENGXIAO,YEJIg12=g21=1,g11=g22=0;

  YOUYAOQIU3)ZHI,GAOPINSHI,g11,g12,g21,g22DOUYAOJINKENENGDIXIAO。

  YISHANGDEFENXIJIELUNJIUSHIZHILIUEMILVBOQISHEJIDEYIBANFANGFAJILVBOXIAOGUODEPINGPANBIAOZHUN。

 

  2 SHILIFENXI

  LCLVBOQIHESIJIEZHILIUXIANLULVBOQISHIGONGCHENGSHIJIZHONGCHANGYONGDELVBOQI,XIAMIANJIUYISHANGMIANDEJIELUNFENXIQILVBOXIAOGUO。TU4WEILCLVBOQIYUANLITU。

  QIHUNHECANSHUFANGCHENGWEI

 

  DUIYUZHILIUFENLIANG,YOUYUfQUXIANGYU0,DUIYINGYOUω=2πfQUXIANGYU0;XIANRANg11=g22=0;g12=g21=1。

  DUIYUXIEBOFENLIANG,

 

  KAOLVDAODANGωL>10SHI,XIANRANYOUg11=g12=g21=g22=0。FENXIXITONGDESHURUDAONAHESHUCHUZUKANG,YAOBAOZHENGSHURUDAONAg11QUXIANGYU0,BIRANSHIDELQUZHIHENDA;YAOBAOZHENGSHUCHUZUKANGg22QUXIANGYU0,BIRANSHIDECQUZHITONGYANGHENDA,ZHEIJIGONGCHENGSHIJIYINGYONGDAILAILEJUXIANXING,ZHEIYEZHENGSHILCLVBOQIDEQUEDIAN。

 

  ZAIGONGCHENGSHIJIZHONGGUANGFANYINGYONGDESIJIEZHILIUXIANLULVBOQIQIYUANLITURUTU5SUOSHI。

  QIHUNHECANSHUFANGCHENGWEI

 

  RUGUOLINGz=1/L1sg,ZEKEYIQIUDEXIANGYINGDECANSHURUXIA:

  g11=gz;g12=g21=z;g22=-L1sz。

  下面分析此滤波器电压传递函数的幅频特性,滤波器的电压传递函数为

 

  JIANGCANSHUgDAIRU,YINGYONGMATLABZUOCHUQIDUISHUFUPINTEXINGQUXIANRUTU6SUOSHI。

  XIANRAN,ZAIDIPINDUANSHUCHUDIANYADESHUAIJIANJIAOXIAO,GAOPINDUANDELVBOXIAOGUOBIJIAOMINGXIAN。

  YOUYISHANGFENXIKEYIKANCHU,YOUYUCIDIANLUYUANJIANCANSHUDEXUANZEFANWEIJIAOKUAN,YINCIJIAORONGYISHEJICHUMANZUSHEJIYAOQIU,QIESHIYONGYUGONGCHENGSHIJIDELVBOQI。ZUOZHEYIJIANGCIDIANLUYINGYONGDAOLEWEIZHANGSHAMOUHUOHUTIYUappSUOSHEJIDEKAIGUANDIANYUANZHONG。

  SHEJIYAOQIUWEI:

  1)SHURU1000VDEJIANFENGDIANYA,ZUIDACHANSHENG20ADIANLIU;

  2)LVBOQISHUCHUDIANLIUCONG0~25ABIANHUASHI,ZAOCHENG513VDIANYABODONGBUCHAOGUO2%。

 

 

  JUCISHEJIYAOQIUKEDEDAOSHEJIYUNXUZHIWEI:

  g11=20/1000=0.02;

  g22=U/I=(513*2%)/25=0.4。

  ZUIZHONGXUANDINGDECANSHUZHIWEI:

  L1=500μH;L2=140μH;R0=0.3Ω;

  C1=470μF;C2=40μF。

  JIANGZHEIZUCANSHUZHIDAIRUSHI(3)DEDAO:

  g=5;z=0.003;

  g11=gz=0.015;g12=g21=0.003;g22=0.2。

  JIARUCILVBOQIQIANHOUKAIGUANDIANYUANSHUCHUDIANYABOXINGRUXIATU7SUOSHI。

开关电源直流EMI滤波器的设计及实现

  3 JIEYU

  BENWENYINGYONGERDUANKOUWANGLUOYUANLI,DUIKAIGUANDIANYUANEMILVBOQIDESHEJIYAOQIUJINXINGLEFENXIZONGJIE,DECHULE3TIAOSHEJIYAOQIU,TASHIHEYURENHELVBOQIDESHEJI。CONGGAISHEJIYAOQIUCHUFA,KEYIDUIXIANYOUDEKAIGUANDIANYUANEMILVBOQIXINGNENGJINXINGFENXI。BENWENJICHULEYIGEYINGYONGGAIYAOQIUSHEJICHUDEEMILVBOQI,BINGYONGZAILEGONGCHENGSHIJI,YUNXINGJIEGUOBIAOMINGGAIYUANLILILUNXINGYUSHIJIANXINGJUNJIAOHAO,JUYOUTONGYONGXING。

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