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电源高频变压器的设计方法简介

亚博足彩 1、JISUANGAOPINBIANYAQICHUJIFENGZHIDIANLIUIpp

  YOUYUSHIDIANLIUBULIANXUXINGDIANYUAN,DANGGONGLVGUANDAOTONGSHI,DIANLIUHUIDADAOFENGZHI,CIZHIDENGYUGONGLVGUANDEFENGZHIDIANLIU。YOUDIANGANDEDIANLIUHEDIANYAGUANXIV=L*di/dtKEZHI:

  SHURUDIANYA:Vin(min)=Lp*Ipp/Tc

取1/Tc=f/Dmax,则上式为:
       
               Vin(min)=Lp*Ipp*f/Dmax

其中:   V in : 直流输入电压,V
   
      Lp  : 高频变压器初级电感值,mH
   
      Ipp : 变压器初级峰值电流,A
   
      Dmax: 最大工作周期系数
   
      f  : 电源工作频率,kHz

亚博足彩   ZAIDIANLIUBULIANXUDIANYUANZHONG,SHUCHUGONGLVDENGYUZAIGONGZUOPINLVXIADEMEIGEZHOUQINEICHUCUNDENENGLIANG,QIWEI:

                  Pout=1/2*Lp*Ipp2*f
将其与电感电压相除可得:

        Pout/Vin(min)=Lp*Ipp2*f*Dmax/(2*Lp*Ipp*f)
         
由此可得:

亚博足彩              Ipp=Ic=2*Pout/(Vin(min)*Dmax)

QIZHONG:Vin(min)=1.4*Vacin(min)-20V(ZHILIULIANBOJIERJIGUANYAJIANG)=232V,QUZUIDAGONGZUOZHOUQIXISHUDmax=0.45。ZE:

亚博足彩          Ipp=Ic=2*Pout/(Vin(min)*Dmax)=2*70/(232*0.45)=1.34A

DANGGONGLVGUANDAOTONGSHI,JIJIYAONENGCHENGSHOUCIDIANLIU。

2、QIUZUIXIAOGONGZUOZHOUQIXISHUDmin

  ZAIFANKUISHIDIANLIUBULIANXUDIANYUANZHONG,GONGZUOZHOUQIXISHUDEDAXIAOYOUSHURUDIANYAJUEDING。

              Dmin=Dmax/[(1-Dmax)*k+Dmax]

QIZHONG:k=Vin(max)/Vin(min)

亚博足彩    Vin(max)=260V*1.4-0V(ZHILIULIANBO)=364V,RUOYUNXU10%WUCHA,Vin(max)=400V。

亚博足彩    Vin(min)=232V,RUOYUNXU7%WUCHA,Vin(min)=216V。

YOUCIKEDE:

            k=Vin(max)/Vin(min)=400/216=1.85

      Dmin=Dmax/[(1-Dmax)*k+Dmax]=0.45/[(1-0.45)*1.85+0.45]=0.31

  YINCI,DANGDIANYUANDESHURUZHILIUDIANYAZAI216V~400VZHIJIANSHI,GONGZUOZHOUQIXISHUDJIEYU0.31~0.45ZHIJIAN。

3、JISUANGAOPINBIANYAQIDECHUJIDIANGANZHILp

亚博足彩          Lp=Vin(min)*Dmax/(Ipp*f)=216*0.45/(1.34*30*103)=2.4mH

4、JISUANCHURAOZUMIANJIAwHETIEXINYOUXIAOMIANJIAeDECHENGJIAw*Ae,XUANZETIEXINCHICUN。

  RUGUOWOMENZHIRAOCHUJIYUXIANJIASHANG,ZE:

亚博足彩              Aw*Ae=(6.33*Lp*Ipp*d2)*108/Bmax

QIZHONG:dWEIJUEYUANXIANDEZHIJING,BmaxXUANZEWEIBsat/2。

  ZAIFANKUISHIBIANYAQIZHONG,RUGUOCHUJIZHAN30%DERAOZUMIANJI,ZEQIYUDE70%WEICIJIHEJUEYUANKONGJIAN,YINCI,Aw*AeXUZAICHENGYI3BEI,WEILEANQUANQIJIAN,WOMENJIANGQITIGAOWEI4BEI。YINCI,

亚博足彩              Aw*Ae=4*(6.33*Lp*Ipp*d2)*108/Bmax

CISHIZHISHIGUSUAN,ZUIHOUTIEXINHEXIANJIADEXUANZESHIKEYIGAIBIANDE。

亚博足彩   JIASHEXUANZERAOZURAOXIANDEDIANLIUMIDUWEI400c.m/A,ZE400c.m/A*1.34A=536(c.m),WOMENCANKAOMEIGUOXIANGUI(AWG),QUNO.22AWGDAOXIAN,QIZHIWEI0.028IN。WOMENXUANZETDK H7C1CAILIAODEE-EXINGTIEXIN,TAZAI100℃SHI,Bsat=3900G,Bmax=Bsat/2=1950G,KEDE:

       Aw*Ae=4*(6.33*Lp*Ipp*d2)*108/Bmax
          =4*(6.33*2.4*103*1.34*0.0282)*108/1950
          =3.27cm4

亚博足彩   YOUTDKMULUZHONGKECHADEEE42*42*15DETIEXINHEXIANJIAAw*Ae=1.83cm2*1.83cm2=3.33cm4,YINCI,WOMENXUANYONGCITIEXIN。

5、JISUANKONGQIJIANXIZHANGDULg

亚博足彩   ZAIFANKUISHIDIANYUANBIANYAQIZHONG,CITONGZHIZAIDIYIXIANGXIANZHONGBIANHUA,DIANLIUCITONGLIANGBUHUICHUXIANFUZHI。WEIFANGZHIBIANYAQIBAOHE,KEYICAIYONGDATIJITIEXINHUOZAICITONGLUJINGSHANGSHIYONGKONGQIJIANXI,WEIJIANSHAODIANYUANTIJI,WOMENCAIYONGJIANXIFA,SHICIZHIHUILUBIANDEPINGTAN,ZAIXIANGTONGDEZHILIUPIANYAXIAKEJIANGDIGONGZUODECITONGMIDU。

  ZAICITONGLUJINGSHANG,KONGQIJIANXIHUICHANSHENGJIAODADECIZU,YINCI,BIANYAQISUOCUNCHUDEDABUFENNENGLIANGSHIZAIKONGQIJIANXIZHONG,KONGQIJIANXITIJIWEIVg,ZHANGDUWEILg。YOU,

             1/2*Lp*Ipp2=1/2*Bmax*H*Vg*108

                  Vg=Ae*Lg

                u0H=Bmax/(0.4*π)

亚博足彩                 u0 :KONGQICIDAOLV=1

KEDE:

亚博足彩    Lg=0.4*π*Lp*Ipp2*108/(Bmax2*Ae)=0.4*π*2.4*10-3*1.342*108/(19502*1.82)=0.078cm

亚博足彩 YINCI,WOMENZAIE-ETIEXINZHONGXINZHUFENGE0.078cmDEJIANXI。

6、JISUANBIANYAQICHUJIXIANQUANNp

       Np=Lp*Ipp*108/(Ae*Bmax)=2.4*10-3*1.34*108/(1.82*1950)=90(T)

亚博足彩 7、JISUANBIANYAQICIJIXIANQUANNs

亚博足彩   ZAISHURUDIANYAZUIXIAO、GONGZUOZHOUQIZUIDASHI,JISUANBIANYAQICIJIXIANQUANNs。

亚博足彩         Vout+Vd=Vin(min)*Dmax/(1-Dmax)*Ns/Np    (VdSHIZHENGLIUGUANYAJIANG)

        Ns=Np*(Vp+Vd)*(1-Dmax)/(Vin(min)*Dmax)
         =90*(5+1)*(1-0.45)/(232*0.45)
         =2.84(T)

QUZHENGSHUWEI3QUAN。

  DIANYUANSHURUDIANLIUWEI14A,400c.m/A*14A=5600(c.m),KAOLVDAOJIFUXIAOYINGHESHENGCHANZUOYEFANGBIAN,WOMENCAIYONG1400c.m,4TIAOXIANBINGLIANLIANSHIYONG,AWG NO:18JIKE。

亚博足彩   GAOPINBIANYAQIDESHEJIFANGFAHENDUO,XIWANGCILIDUIDAJIAYOUSUOBANGZHU。

亚博足彩