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放大电路的故障检测方法

   日期:2019-12-24     浏览:357    评论:0    
核心提示:选择万用表电压挡合适量程(这里选择电压20V挡),黑表笔接地,红表笔依次接到晶体管的基极、发射极和集电极。然后分别得到三个电压,即Ub、Ue和Uc,用这三个电压与正常值比较,通过分析推断,确定故障元器件。

放大电路的故障检测方法,具体如下:

1、测量电压法

四川快乐12XUANZEWANYONGBIAODIANYADANGHESHILIANGCHENG(ZHEILIXUANZEDIANYA20VDANG),HEIBIAOBIJIEDI,HONGBIAOBIYICIJIEDAOJINGTIGUANDEJIJI、FASHEJIHEJIDIANJI。RANHOUFENBIEDEDAOSANGEDIANYA,JIUb、UeHEUc,YONGZHEISANGEDIANYAYUZHENGCHANGZHIBIJIAO,TONGGUOFENXITUIDUAN,QUEDINGGUZHANGYUANQIJIAN。

YOUSHIXUYAOCELIANGUceHEUbe,YONGHEIBIAOBIJIEFASHEJI,HONGBIAOBIJIEJIDIANJI,CEDEDEJIEGUOWEIUce(Uce=Uc-Ue);YONGHEIBIAOBIJIEFASHEJI,HONGBIAOBIJIEJIJI,CEDEDEZHIWEIUbe(Ube=Ub-Ue)。YONGSUOCEDEDEJIEGUOYUZHENGCHANGZHIBIJIAO,TUIDUANCHUSUNHUAIYUANQIJIAN。DUIDIANLUDEJIANCEYIBANYONGCELIANGDIANYAFA,JIHUBUYONGCELIANGDIANLIUFA。

故障判断方法如下

四川快乐121)JIASHERb1KAILU,ZEJINGTIGUANJIJIMEIYOUPIANZHIDIANYA,JIUb=0,YOUCIYINQIUe=0,Ie=Ic=0,Uce=24V(DIANYUANDIANYA)。DANGYONGWANYONGBIAOJIANCEDAOUb=0,ERVCC=24VSHI,JIUKEYIHAOWUYIWENDIPANDINGRb1KAILU。

2)假设Rb2开路,则Ib通路发生改变,为VCC→Rb1→b-e结→Re→地,基极电流必然增大。此时Ic将增大,晶体管饱和(c-e结内阻很小,Uce低于0.1V)。Uc=Ue=7.2V,晶体管必然发热严重。

3)JIASHERcKAILU,RcKAILUBUHUIYINGXIANGDAOUb,ZHIHUIZAOCHENGIc=0,LILUNSHANGUcWEI0V,DANZAICELIANGDIANYASHI,JINGTIGUANDEb-cJIETONGGUOWANYONGBIAODENEIZUZHENGXIANGDAOTONG,CEDEYUUbYUEXIANGDENGDEDIANYA,SHIJICELIANGDEZHIDENGYUUb。RUOUeZHENGCHANG,KEDUANDINGRcKAILU。

4)JIASHEReKAILU,YEBUHUIYINGXIANGUb,YINIb=0,Ie=Ic=0,Uc=VCC,Ue=Ub。SHIJICELIANGDEJIEGUORUGUOSHIZHEIXIEZHI,JIUSHUOMINGReKAILU。

5)假设晶体管的b-e结击穿短路(Ube=0V),则Ub=正常值(5.6V),Ue=Ub,Uc=VCC;若b-e结断路,则Ib=0,Ub正常,Ue=Ub,Uc=VCC。

6)假设晶体管的c-e结击穿短路,不影响Ub和Ue,造成Uce=0V,Uc=Ue=7.四川快乐125V(即Rc与Re的串联分压值);若c-e结开路,Ub、Ue正常,Uc=VCC。

TONGGUODUIUb、Uc、UeCELIANG,YONGZHEISANGESHUJUYUZHENGCHANGZHIBIJIAO,KEFENXITUIDUANCHUSUNHUAIYUANQIJIAN。ZAIXUDUODIANLUZHONG,ZAIRb1HEReSHANGHAIBINGJIELEDIANRONGQI。DIANRONGQIKAILUBUYINGXIANGZHILIUPIANZHI,DANKENENGHUIYINGXIANGDAOXINHAODEOUHE,SHIXINHAODEFUDUJIANXIAO、FANGDALIANGBUGOUHUOZHECHANSHENGGANRAODENG。RUOSHIDIANRONGQILOUDIANHUOJICHUANDUANLU,GUZHANGQINGKUANGYUSHANGSHUDIANZUSUNHUAIQINGKUANGXIANGSI。

2、模拟检测法

MONIJIANCEFAJIUSHIRENWEIDIJIDIANLUJIAYIGEXINHAO,JIANCHADIANLUSHIFOUZHENGCHANGDEYIZHONGJIANCHAFANGFA。MONIJIANCEFADEYUANLI:DUANLUb-eJIE,SHIIbRENWEIDIDENGYU0,IcYEJIUDENGYU0,JINGTIGUANJIEZHI,UcSHENGGAODAODIANYUANDIANYAZHI。

JUTIJIANCEFANGFA:ZAIJIANCEUcDIANYADETONGSHI,SHUNJIANDUANLUJINGTIGUANDEb-eJIE,GUANCHAUcSHIFOUBIANHUA,RUOBIANHUA,ZEDIANLUZHENGCHANG;FOUZEGAIDIANLUYOUGUZHANG。

3、测量电阻法

四川快乐12CELIANGDIANZUFASHIYONGWANYONGBIAODIANZUDANGYICIJIANCHAGEGEDIANZUYIJIJINGTIGUANSHIFOUZHENGCHANG。ZHEIZHONGFANGFAYINBUTONGDIAN,JIANCHASHIBIJIAOANQUAN。DANYINDIANLUZHONGHAIBINGJIEYOUQITAYUANQIJIAN,SUOCEDIANZUZHIWANGWANGBUZHUNQUE,SHIJICEDEDEZHIPIANXIAO,YOUSHIXUYAOCHAIXIAYUANQIJIANDEYIZHIYINJIAO,CAINENGCECHUSHIJIZHI。

放大电路的故障分析方法

RUTUSUOSHIDEDIANLUWEILI,SHUOMINGGONGJIDIANJIFANGDAQIDIANLUDEGUZHANGFENXIFANGFA。

 

TISHI:GONGJIDIANJIFANGDAQIDIANLUZHONGDESANJIGUANJIDIANJIJIEZHILIUGONGZUODIANYA+vDUAN,ZAICELIANGSANJIGUANJIDIANJIZHILIUGONGZUODIANYASHIYAOZHUYIZHEIYIDIAN,YIMIANCHANSHENGCUOWUDEPANDUAN。

关于这一共集电极放大器电路的故障分析说明如下:

1、DANGDIANZUR1KAILUSHI,VT1JIDIANJIDIANYADENGYU+v,YUDIANLUGONGZUOZHENGCHANGSHIXIANGTONG,DANSHIJIDIANJIDIANLIUDENGYULING;DIANZUR1FASHENGQITAGUZHANGSHI,VT1JIDIANJIZHILIUDIANYADOUDENGYU+v,ZHEISHIYINWEIGONGJIDIANJIFANGDAQIDIANLUZHONGDESANJIGUANMEIYOUJIDIANJIFUZAIDIANZU,ZHEIYIDIANYUGONGFASHEJIFANGDAQIDIANLUBUTONG,YINGYINQIZHUYI。

四川快乐122、DANGR2KAILUSHI,VT1MEIYOUZHILIUGONGZUODIANLIU;DANGR2DUANLUSHI,VT1FASHEJIDIANYAWEILING(ZHEIYIDIANYUGONGFASHEJIFANGDAQIDIANLUXIANGTONG),DANSHIMEIYOUJIAOLIUXINHAOSHUCHU,ZHEIYIDIANYUGONGFASHEJIFANGDAQIDIANLUBUXIANGTONG。


 
标签: 电路 电压
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