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    高频开关电源电路原理分析

    亚博电子竞猜2018-08-27 10:45:39

    开关电源微介绍

    开关电源具有体积小、效率高的一系列优点。已广泛应用于各种电子产品中。然而,由于控制电路复杂,输出纹波电压高,开关电源的应用也受到限制。它

    DIANYUANXIAOXINGHUADEGUANJIANSHIDIANYUANDEXIAOXINGHUA,YINCIBIXUJINKENENGDIJIANSHAODIANYUANDIANLUDESUNHAO。DANGKAIGUANDIANYUANGONGZUOZAIKAIGUANZHUANGTAISHI,KAIGUANDIANYUANDEKAIGUANSUNHAOBUKEBIMIANDICUNZAI,SUNHAOSUIZHEKAIGUANPINLVDEZENGJIAERZENGDA。LINGYIFANGMIAN,KAIGUANDIANYUANZHONGDEBIANYAQIHEDIANKANGQIDENGCIXINGYUANJIANHEDIANRONGYUANJIANDESUNHAOSUIZHEPINLVDEZENGJIAERZENGJIA。TA

    在目前市场上,开关电源中的功率晶体管大多是双极型晶体管,开关频率可以达到几十kHz,MOSFET开关电源的开关频率可以达到几百kHz。必须使用高速开关器件来提高开关频率。对于开关频率高于MHz的电源,可以使用谐振电路,这被称为谐振开关模式。它可以大大提高开关速度。原则上,开关损耗为零,噪声非常小。这是一种提高开关电源工作频率的方法。采用谐振开关模式的兆赫变换器。
    亚博电子竞猜 开关电源可以通过高频开关模式很好的解决这一问题。对于高频开关电源而言,AC输入电压可以在进入变压器之前升压(升压前一般是50-60 KHz)。随着输入电压的升高,变压器以及电容等元器件的个头就不用像线性电源那么的大。这种高频开关电源正是我们的个人PC以及像VCR录像机这样的设 备所需要的。需要说明的是,我们经常所说的“开关电源”其实是“高频开关电源”的缩写形式,和电源本身的关闭和开启式没有任何关系的。

    开关电源分类介绍

    开关电源具有多种电路结构:(1)根据驱动方式,存在自激和自激。它

    2)GENJUDC/DCBIANHUANQIDEGONGZUOFANGSHI:(1)DANDUANZHENGJIHEFANJI、TUIWANSHI、BANQIAOSHI、QUANQIAOSHIDENG;2)JIANGYASHI、SHENGYASHIHESHENGYASHI。TA

    亚博电子竞猜 (3)GENJUDIANLUDEZUCHENG,YOUXIEZHENHEFEIXIEZHEN。TA

    亚博电子竞猜 (4)GENJUKONGZHIFANGSHIFENWEI:MAIKUANDIAOZHI(PWM)、MAICHONGPINLVDIAOZHI(PFM)、PWMHEPFMHUNHE。(5)GENJUDIANYUANGELIHEFANKUIKONGZHIXINHAOOUHEFANGSHI,CUNZAIGELI、FEIGELIHEBIANYAQIOUHE、GUANGDIANOUHEDENGWENTI。ZHEIXIEZUHEKEYIXINGCHENGGEZHONGKAIGUANMOSHIDIANYUAN。YINCI,SHEJIZHEXUYAOGENJUGEZHONGMOSHIDETEDIAN,YOUXIAODIJIEHEQILAI,SHENGCHANCHUGAOZHILIANGDEKAIGUANWENYADIANYUAN,YIMANZUXUYAO。

    开关电源原理解析

    亚博电子竞猜 XIATU3HE4MIAOSHUDESHIKAIGUANDIANYUANDEPWMFANKUIJIZHI。TU3MIAOSHUDESHIMEIYOUPFC(Power Factor Correction,GONGLVYINSUXIAOZHENG) DIANLUDELIANJIADIANYUAN,TU4MIAOSHUDESHICAIYONGZHUDONGSHIPFCSHEJIDEZHONGGAODUANDIANYUAN。

    电源


     

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    亚博电子竞猜 WEILERANGDUZHENENGGOUGENGHAODELIJIEDIANYUANDEGONGZUOYUANLI,YISHANGWOMENTIGONGDESHIFEICHANGJIBENDETUJIE,TUZHONGBINGWEIBAOHANQITAEWAIDEDIANLU,BIRUSHUODUANLUBAOHU、DAIJIDIANLUYIJIPGXIN HAOFASHENGQIDENGDENG。DANGRANLE,RUGUONINHAIXIANGLEJIEYIXIAGENGJIAXIANGJINDETUJIE,QINGKANTU5。RUGUOKANBUDONGYEMEIGUANXI,YINWEIZHEIZHANGTUBENLAIJIUSHIWEINEIXIEZHUANYEDIANYUANSHEJIRENYUANKANDE


    电路

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    KUISONGPWMKONGZHIDIANLUDEHUILUFUZESUOYOUXUYAODEDIAOJIEGONGNENG。RUGUOSHUCHUDIANYACUOWUSHI,PWMKONGZHIDIANLUJIUHUIGAIBIANGONGZUOZHOUQIDEKONGZHIXINHAOYISHIYINGBIANYAQI,ZUIZHONGJIANGSHUCHUDIANYAXIAOZHENGGUOLAI。ZHEIZHONGQINGKUANGJINGCHANGHUIFASHENGZAIPCGONGHAOSHENGGAODESHI,CISHISHUCHUDIANYAQUYUXIAJIANG,HUOZHEPCGONGHAOXIAJIANGDESHI,CISHISHUCHUDIANYAQUYUSHANGSHENG。

    ZAIKANXIAYIYESHI,WOMENYOUBIYAOLEJIEYIXIAYIXIAXINXI:

    ★ZAIBIANYAQIZHIQIANDESUOYOUDIANLUJIMOKUAICHENGWEI“primary”(YICICE),ZAIBIANYAQIZHIHOUDESUOYOUDIANLUJIMOKUAICHENGWEI“secondary”(ERCICE);

    ★CAIYONGZHUDONGSHIPFCSHEJIDEDIANYUANBUJUBEI110 V/ 220 VZHUANHUANQI,TONGSHIYEMEIYOUDIANYABEIYAQI;

    亚博电子竞猜 ★DUIYUMEIYOUPFCDIANLUDEDIANYUANERYAN,RUGUO110 V / 220 VBEISHEDINGWEI110 VSHI,DIANLIUZAIJINRUZHENGLIUQIAOZHIQIAN,DIANYUANBENSHENJIANGHUILIYONGDIANYABEIYAQIJIANG110 VTISHENGZHI220 VZUOYOU;

    ★PCDIANYUANSHANGDEKAIGUANGUANYOUYIDUIGONGLVMOSFETGUANGOUCHENG,DANGRANYEYOUQITADEZUHEFANGSHI,ZHIHOUWOMENJIANGHUIXIANGJIE;

    ★BIANYAQISUOXUBOXINGWEIFANGXINGBO,SUOYITONGGUOBIANYAQIHOUDEDIANYABOXINGDOUSHIFANGXINGBO,ERFEIZHENGXIANBO;

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