AG体育

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為開關電源選擇合適的電感

AG体育DIANGANSHIKAIGUANDIANYUANZHONGCHANGYONGDEYUANJIAN,YOUYUTADEDIANLIU、DIANYAXIANGWEIBUTONG,SUOYILILUNSHANGSUNHAOWEILING。DIANGANCHANGWEICHUNENGYUANJIAN,YECHANGYUDIANRONGYIQIYONGZAISHURULVBOHESHUCHULVBODIANLUSHANG, YONGLAIPINGHUADIANLIU。DIANGANYEBEICHENGWEIELIUQUAN,TEDIANSHILIUGUOQISHANGDEDIANLIUYOU“HENDADEGUANXING”。HUANJUHUASHUO,YOUYUCITONGLIANXUTEXING,DIANGANSHANGDEDIANLIUBIXUSHILIANXUDE,FOUZEJIANGHUICHANSHENGHENDADE DIANYAJIANFENG。

AG体育DIANGANWEICIXINGYUANJIAN,ZIRANYOUCIBAOHEDEWENTI。YOUDEYINGYONGYUNXUDIANGANBAOHE,YOUDEYINGYONGYUNXUDIANGANCONGYIDINGDIANLIUZHIKAISHIJINRUBAOHE, YEYOUDEYINGYONGBUYUNXUDIANGANCHUXIANBAOHE,ZHEYAOQIUZAIJUTIXIANLUZHONGJINXINGQUFEN。DADUOSHUQINGKUANGXIA,DIANGANGONGZUOZAI“XIANXINGQU”,CISHIDIANGANZHIWEIYICHANGSHU,BUSUIZHUDUANDIANYAYUDIANLIUERBIANHUA。DAN SHI,KAIGUANDIANYUANCUNZAIYIGEBUKEHUSHIDEWENTI,JIDIANGANDERAOXIANJIANGDAOZHILIANGGEFENBUCANSHU(HUOJISHENGCANSHU),YIGESHIBUKEBIMIANDERAOXIANDIANZU,LINGYIGESHIYURAOZHIGONGYI、CAILIAOYOUGUANDEFENBUSHI ZASANDIANRONG。ZASANDIANRONGZAIDIPINSHIYINGXIANGBUDA,DANSUIPINLVDETIGAOERJIANXIANCHULAI,DANGPINLVGAODAOMOUGEZHIYISHANGSHI,DIANGANYEXUBIANCHENGDIANRONGTEXINGLE。RUGUOJIANGZASANDIANRONG“JIZHONG”WEIYIGEDIANRONG, ZECONGDIANGANDEDENGXIAODIANLUKEYIKANCHUZAIMOUYIPINLVHOUSUOCHENGXIANDEDIANRONGTEXING。

AG体育DANGFENXIDIANGANZAIXIANLUZHONGDEGONGZUOZHUANGKUANGHUOZHEHUIZHIDIANYADIANLIUBOXINGTUSHI,BUFANGKAOLVXIAMIANJIGETEDIAN:

AG体育1. DANGDIANGANLZHONGYOUDIANLIUILIUGUOSHI,DIANGANCHUCUNDENENGLIANGWEI:

AG体育E=0.5×L×I2 (1)

2. ZAIYIGEKAIGUANZHOUQIZHONG,DIANGANDIANLIUDEBIANHUA(WENBODIANLIUFENGFENGZHI)YUDIANGANLIANGDUANDIANYADEGUANXIWEI:

V=(L×di)/dt (2)

YOUCIKEKANCHU,WENBODIANLIUDEDAXIAOGENDIANGANZHIYOUGUAN。

3. JIUXIANGDIANRONGYOUCHONG、FANGDIANDIANLIUYIYANG,DIANGANQIYEYOUCHONG、FANGDIANDIANYAGUOCHENG。DIANRONGSHANGDEDIANYAYUDIANLIUDEJIFEN(AN·MIAO)CHENGZHENGBI,DIANGANSHANGDEDIANLIUYUDIANYADEJIFEN(FU·MIAO)CHENGZHENGBI。ZHIYAODIANGANDIANYABIANHUA,DIANLIUBIANHUALVdi/dtYEJIANGBIANHUA;ZHENGXIANGDIANYASHIDIANLIUXIANXINGSHANGSHENG,FANXIANGDIANYASHIDIANLIUXIANXINGXIAJIANG。

AG体育JISUANCHUZHENGQUEDEDIANGANZHIDUIXUANYONGHESHIDEDIANGANHESHUCHUDIANRONGYIHUODEZUIXIAODESHUCHUDIANYAWENBOERYANFEICHANGZHONGYAO。

CONGTU1KEYIKANCHU,LIUGUOKAIGUANDIANYUANDIANGANQIDEDIANLIUYOUJIAOLIUHEZHILIULIANGZHONGFENLIANGZUCHENG,YINWEIJIAOLIUFENLIANGJUYOUJIAOGAODEPINLV,SUOYITAHUITONGGUOSHUCHUDIANRONGLIURUDI,CHANSHENGXIANGYINGDESHUCHUWENBODIANYAdv=di×RESR。ZHEGEWENBODIANYAYINGJINKENENGDI,YIMIANYINGXIANGDIANYUANXITONGDEZHENGCHANGCAOZUO,YIBANYAOQIUFENGFENGZHIWEI10mV~500mV。

為開關電源升壓降壓電路選擇合適的電感

TU1:KAIGUANDIANYUANZHONGDIANGANDIANLIU。

WENBODIANLIUDEDAXIAOTONGYANGHUIYINGXIANGDIANGANQIHESHUCHUDIANRONGDECHICUN,WENBODIANLIUYIBANSHEDINGWEIZUIDASHUCHUDIANLIUDE10%~30%,YINCIDUIJIANGYAXINGDIANYUANLAISHUO,LIUGUODIANGANDEDIANLIUFENGZHIBIDIANYUANSHUCHUDIANLIUDA5%~15%。

 

降壓型開關電源的電感選擇

WEIJIANGYAXINGKAIGUANDIANYUANXUANZEDIANGANQISHI,XUYAOQUEDINGZUIDASHURUDIANYA、SHUCHUDIANYA、DIANYUANKAIGUANPINLV、ZUIDAWENBODIANLIU、ZHANKONGBI。XIAMIANYITU2WEILISHUOMINGJIANGYAXINGKAIGUANDIANYUANDIANGANZHIDEJISUAN,SHOUXIANJIASHEKAIGUANPINLVWEI300kHz、SHURUDIANYAFANWEI12V±10%、SHUCHUDIANLIUWEI1A、ZUIDAWENBODIANLIU300mA。

為開關電源升壓降壓電路選擇合適的電感
AG体育 圖2:降壓型開關電源的電路圖。

ZUIDASHURUDIANYAZHIWEI13.2V,DUIYINGDEZHANKONGBIWEI:D=Vo/Vi=5/13.2=0.379 (3)

QIZHONG,VoWEISHUCHUDIANYA、ViWEISHUCHUDIANYA。DANGKAIGUANGUANDAOTONGSHI,DIANGANQISHANGDEDIANYAWEI:

V=Vi-Vo=8.2V (4)

AG体育DANGKAIGUANGUANGUANDUANSHI,DIANGANQISHANGDEDIANYAWEI:

AG体育V=-Vo-Vd=-5.3V (5)

dt=D/F (6)

BAGONGSHI2/3/6DAIRUGONGSHI2DECHU:

AG体育SHENGYAXINGKAIGUANDIANYUANDEDIANGANXUANZE

DUI YUSHENGYAXINGKAIGUANDIANYUANDEDIANGANZHIJISUAN,CHULEZHANKONGBIYUDIANGANDIANYADEGUANXISHIYOUSUOGAIBIANWAI,QITAGUOCHENGGENJIANGYAXINGKAIGUANDIANYUANDEJISUANFANGSHIYIYANG。YITU3WEILIJINXINGJISUAN,JIASHEKAIGUANPINLVWEI 300kHz、SHURUDIANYAFANWEI5V±10%、SHUCHUDIANLIUWEI500mA、XIAOLVWEI80%,ZEZUIDAWENBODIANLIUWEI450mA,DUIYINGDEZHANKONGBIWEI:

AG体育D=1-Vi/Vo=1-5.5/12=0.542 (7)

為開關電源升壓降壓電路選擇合適的電感
圖3:升壓型開關電源的電路圖。

AG体育KAIGUANGUANDAOTONGSHI,DIANGANQISHANGDEDIANYAWEI:

AG体育V=Vi=5.5V (8)

AG体育DANGKAIGUANGUANGUANDUANSHI,DIANGANQISHANGDEDIANYAWEI:

AG体育V=Vo+Vd-Vi=6.8V (9)

BAGONGSHI6/7/8DAIRUGONGSHI2DECHU:

AG体育QING ZHUYI,SHENGYADIANYUANYUJIANGYADIANYUANBUTONG,QIANZHEDEFUZAIDIANLIUBINGBUSHIYIZHIYOUDIANGANDIANLIUTIGONG。DANGKAIGUANGUANDAOTONGSHI,DIANGANDIANLIUJINGGUOKAIGUANGUANLIURUDI,ERFUZAIDIANLIUYOUSHUCHUDIANRONGTIGONG,YINCISHU CHUDIANRONGBIXUYOUZUGOUDADECHUNENGRONGLIANGLAITIGONGZHEYIQIJIANFUZAISUOXUDEDIANLIU。DANZAIKAIGUANGUANGUANDUANQIJIAN,LIUJINGDIANGANDEDIANLIUCHULETIGONGGEIFUZAI,HUANGEISHUCHUDIANRONGCHONGDIAN。

一 般而言,電感值變大,輸出紋波會變小,但電源的動態響應也會相應變差,所以電感值的選取可以根據電路的具體應用要求來調整以達到最理想效果。開關頻率的提 高可以讓電感值變小,從而讓電感的物理尺寸變小,節省電路板空間,因此目前的開關電源有往高頻發展的趨勢,以適應電子產品的體積越來越小的要求

 

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