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大功率弧焊逆变电源的IGBT保护技术_发动机散热器

发布时间:2019-12-20    信息来源:nanofib.com    作者:儒安机械

  弧焊逆变电源广泛应用于造船、机械、汽车、电力、化工、石油、轻工业、航天、国防工业等部门。近年来大功率电力电子器件IGBT以其独特的优点受到众多厂家的青睐,并逐步应用于现代弧焊逆变电源中。然而弧焊逆变电源工作环境恶劣,其负载决定了其工作电流变化剧烈,如果我们对IGBT性能和特点存在模糊认识并且在控制方法和保护技术等方面未采取有效的措施,则很有可能会损坏IGBT,从而使人们开始怀疑IGBT的质量是否真正符合资料上所列出的各项参数。本文针对以上问题介绍了一种应用电路硬件保护和单片机控制程序保护相结合的方法来对IGBT进行有效的保护。

2.IGBT DEGONGZUOYUANLI

2.1 IGBTJIEGOU

  IGBTJIEGOUSHANGYUMOSFETSHIFENXIANGSI,ZHISHIDUOLEYIGE

CENG,YINCHUZUOWEIFASHEJI,ZHAJI、JIDIANJIYUMOSFETWANQUANXIANGSI。QIJIANHUADENGXIAODIANLURUTU1SUOSHI。

大功率弧焊逆变电源的IGBT保护技术_发动机散热器


图1


  IGBT的工作原理:IGBT由栅极电压正负来控制。当加上正栅极电压时,绝缘栅下形成沟道,MOSFET导通,相当于

JIEDAOE,WEIPNPJINGTIGUANTIGONGLELIUDONGDEJIJIDIANLIU,CONGERSHIPNPGUAN(JIZHENGGEIGBT)DAOTONG。DANGJIASHANGFUZHAJIDIANYASHI,IGBTGONGZUOGUOCHENGXIANGFAN,XINGCHENGGUANDUAN。

2.2 IGBTANQUANGONGZUOQU

  ZAIIGBTKAIGUANGUOCHENGZHONG,DADIANLIUHEDADIANYADEZHONGDIEZAOCHENGZHUYAODEGONGHAO,TONGSHICHENGSHOUJIAOGAODEdi/dtHEdv/dtJIDIANLIUDIANYAYINGLI。TEBIESHIYUNXINGZAIPWMYINGKAIGUANZHUANGTAIXIA,ZHEISHIYINGXIANGKEKAOXINGDEZHONGYAOYUANYIN。WEILEBAOZHENGQIANQUANKEKAODEGONGZUO,BUJINYOUDIANLIUDIANYADEXIANZHI,HAIBIXUSHIQIDONGTAIGUOCHENGDEYUNXINGGUIJIZAIANQUANGONGZUOQUNEI。RUTU2SUOSHI,ZHENGPIANANQUANGONGZUOQUFBSOASHIZHIZHAJIJIAZHENGXIANGDIANYASHIDEANQUANGONGZUOQU,DUIYINGYUDAOTONGZHUANGTAI。SANTIAOBIANJIEFENBIEDUIYINGYUNXUDIANLIU、YUNXUDIANYAHEYUNXUGONGHAO。SUIZHEDAOTONGSHIJIANZENGZHANG,GONGHAOHEWENSHENGZENGJIA,ANQUANGONGZUOQUSUOXIAO。

大功率弧焊逆变电源的IGBT保护技术_发动机散热器

IGBTGUANDUANSHIWEIFANXIANGPIANZHI,DUIYINGANQUANGONGZUOQUWEIFANPIANANQUANGONGZUOQURBSOA。CHULEDIANLIUDIANYABIANJIEWAI,LINGYIBIANJIEWEIQIJIANGUANDUANHOUDEZHONGJIADIANYASHANGSHENGLV。YINCI,DIANYABIANHUALVYUEDA,ANQUANGONGZUOQUYUEXIAO。SHIJISHANG,ZHEIJIUSHIYINWEIIGBTDONGTAIQINGZHUXIAOYINGDEXIANZHIDEYUANGU。SUOYIZAIHUHANNIBIANDIANYUANDESHEJIZHONG,XIANZHIGUODIANLIUHEGUODIANYA、GAISHANQIJIANDEYUNXINGTEXINGYIJIJIANGDIGONGHAO,DOUYOUZHONGYAODEYIYI。ZAIBUTONGDEGONGZUOZHUANGTAIXIA,BAOZHENGIGBTZAIANQUANGONGZUOFANWEINEIBINGCHUYUJIAOHAOZHUANGTAIXIA,SHITIGAOZHENGJIKEKAOXINGDEGUANJIANJISHU。


3.IGBTDEBAOHUCUOSHI

  YOUYUQIJIEGOUHEANQUANGONGZUOQUZHIIGBTDEKEKAOYUFOUZHUYAOYOUYIXIAYINSUJUEDING:

  1、ZHAJIYUFASHEJIDIANYA

  2、JIDIANJIYUFASHEJIDIANYA

  3、LIUGUOJIDIANJIDEDIANLIU

  4、IGBTDEJIEWEN

  YISHANGDESIGEYINSUZAIGONGZUOHUANJINGELIEDEHUHANNIBIANDIANYUANZHONGDOUSHIXUYAOZHUYIDE,YOUQISHIDIERXIANGHEDISANXIANGSHIWOMENZAISHEJIBAOHUDIANLUZHONGZHONGDIANKAOLVDENEIRONG。

3.1 IGBTZHAJIDEBAOHU

  IGBTDEZHAJI-FASHEJIQUDONGDIANYA   

DEBAOZHENGDIANYAWEI           

,YINCIZAIIGBTDEQUDONGDIANLUYINGDANGSHEZHIZHAJIYAXIANFUDIANLU;LINGWAIYOUYUHANJIEDIANYUANSHEBEIGONGZUOHUANJINGFEICHANGELIE,ZAIYUNSHUHUOZHENDONGGUOCHENGZHONGKENENGHUISHIZHAJIHUILUDUANKAI,ZHEISHIRUGUODIANYUANSHEBEIKAISHIGONGZUO,ZESUIZHEJIDIANJIDIANWEIDEBIANHUA,YOUYUZHAJIYUYUJIDIANJIHEFASHEJIZHIJIANJISHENGDIANRONGDECUNZAI,SHIDEZHAJIDIANWEISHENGGAO,JIDIANJI-FASHEJIJIANYOUDIANLIULIUGUO。ZHEISHIRUOJIDIANJIHEFASHEJICHUYUGAOYAZHUANGTAISHI,HUISHIIGBTFARE,JIYIYINQIIGBTSUNHUAI。WEIFANGZHICILEIQINGKUANGFASHENG,KEZAIIGBTDEZHAJIYUFASHEJIJIANBINGJIEYIZHI    DEDIANZU,CIDIANZUYINGJINLIANGKAOJINZHAJIYUFASHENJI。RUTU3SUOSHI。

大功率弧焊逆变电源的IGBT保护技术_发动机散热器


图3


3.2 集电极与发射极的过压保护

  HUHANNIBIANDIANYUANJINRUHANJIEZHUANGTAISHI,SHUCHUDUANJICONGKONGZAIZHUANRUJIEJINDUANLUZHUANGTAI,ZHEISHIYAOQIUSHUCHUDIANLIUBIXUCHUYUSUOXUYAODEHENGDINGZHUANGTAI。LILUNSHANG,CAIYONGHENGLIUBIHUANKONGZHIXITONGJIKEYIKONGZHIDIANYUANDEDUANLUDIANLIU,DANSHIJIDUANLUSHI,SHUCHUDIANYAHENDI,JIIGBTDEGONGZUOMAIKUANHENZHAI,CAINENGBAOZHENGSHUCHUDIANLIUHENGDING,ZHEIJIUZAOCHENGLEIGBTZAIHENDUANDEDAOTONGQIJIAN,XISHOUDIANRONGWEIFENFANGDIANERMASHANGGUANDUAN,QIEYINFENBUDIANGANHELOUGANDEYINGXIANG,IGBTDEGUANDUANSHIZAICHENGSHOUJIAOGAODEFANYAXIAJINXINGDE,JIYISHIIGBTSUNHUAI,WEILESHIIGBT GUANDUANGUODIANYANENGDEDAOYOUXIAODEYIZHIBINGJIANSHAOGUANDUANSUNHAO,XUYAOJIIGBTZHUDIANLUSHEZHIGUANDUANHUANCHONGXISHOUDIANLU。IGBTDEGUANDUANHUANCHONGXISHOUDIANLUFENWEICHONGFANGDIANXINGHEFANGDIANZUZHIXING,CONGXISHOUGUODIANYADENENGLISHANGLAISHUO,CHONGFANGDIANXINGXIAOGUOJIAOHAO,SUOYIKEZAIHUHANNIBIANDIANYUANZHONGDEIGBTGUOYABAOHUHUANCHONGDIANLUKECAIYONGTU4SUOSHIHUANCHONGXISHOUDIANLU:

大功率弧焊逆变电源的IGBT保护技术_发动机散热器


图4

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