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ղ    Ϊҳ
Ʒ
> IGBTɢ >

IGBT¶밲ȫ

Դhttp://www.peropierrot.com/
IGBT
|¼|ٷ|/ҳ|¼|ٷ|/ҳģ
IGBTIGBTֺFWDֹIGBTԴڲIGBTͷܣFWD|¼|ٷ|/ҳоƬ|¼|ٷ|/ҳǸԷĵĺϼƼΪIGBT|¼|ٷ|/ҳ巢ⷢĿɷΪ̬ͽ|¼|ٷ|/ҳݽɱ|¼|ٷ|/ҳ
IGBTһ뿪Ҫڣ

1IGBTڵͨʱб͵ѹ-Vcesat
2IGBTڿʱпܺ-EonEoff

IGBTĵĸԴ|¼|ٷ|/ҳVcesatɵͨEonEoffɿ
ͨ + = IGBT

FWDҲΪ

1ͨʱͨѹVf
2ڷָĹзָܺģErec

VfɵͨErecɿ
ͨ + = FWD
VcesatEon|¼|ٷ|/ҳEoffVfErecIGBT/FWDоƬļ|¼|ٷ|/ҳIGBT/FWDоƬͬVcesatEon|¼|ٷ|/ҳEoffVfErecҲͬ
IGBTĿɷΪ̬ĺͶ̬о̬İ̬ͨĺͶ̬̬ģģͨĺ͹ضڹضʱ|¼|ٷ|/ҳĵԼ|¼|ٷ|/ҳѹ|¼|ٷ|/ҳ˻СԺԲ˼㾲̬ĵʱԲǶ̬ƽ˵ľ̬һָ̬ͨ|¼|ٷ|/ҳ

IGBT-IGBTͨģ
IGBTͨڱ״̬IGBT伫ѹԼڱ͵ѹVcesat
IGBTָ̬ͨIGBTͨڵͨѹVcesat
VcesatIcĹϵͼĽԷʾ
Vcesat = Vt0 + Rce * Ic
IGBTĵͨģ
Pcond = d * Vcesat * IcdΪIGBTĵͨռձ
IGBT͵ѹĴСͨĵIcоƬĽTjżѹVgeй
IGBT͵ѹֵVcesat|¼|ٷ|/ҳ
ӢIGBTµı͵ѹֵ
1Tj=252Tj=125ΪIc,nom(ıƵ)VGE=+15V
IGBT-IGBTģ
IGBT֮ԴڿܺΪڿͨ͹ضϵ˲͵ѹص
ſƵʵеıҲñȽϴİͨĺ͹ضڸͨضʱģͨӵؽ͵ѹٶʱַõͬʱ迼ʵʵο֮IJ
VceӽEonEoffɽƵؿIcVceȣ
Eon = EON * IC/IC,NOM * Vce /
Eoff = EOFF * IC/IC,NOM * Vce /
IGBTĿģ
PSW = Fsw * (Eon + Eoff)fSWΪƵ|¼|ٷ|/ҳ
IGBTܺĵĴС뿪ʱĵIcѹVceоƬĽ£Tjй|¼|ٷ|/ҳ
IGBTܺĵֵEon|¼|ٷ|/ҳEoff
ӢIGBTµĿֵܺ
1Tj=252Tj=125ΪIC,NOM(|¼|ٷ|/ҳıƵ)|¼|ٷ|/ҳ
IGBT-FWDģ
ָFWDĹ|¼|ٷ|/ҳͨתΪϵ˲|¼|ٷ|/ҳ|¼|ٷ|/ҳΪͨٻָΪ״̬
Vrӽ|¼|ٷ|/ҳErecɽƵؿIfVrȣ
Erec = EREC * If /IF,NOM * Vr/
FWDĿģ
Prec = fSW * ErecfSWΪƵ
FWDָܺĵĴСͨʱĵIf|¼|ٷ|/ҳ仯dif/dtѹVrоƬĽ£Tjй
|¼|ٷ|/ҳIGBTָܺĵֵEREC
ӢIGBTµķֵָܺ
1Tj=252Tj=125ΪIF,NOM|¼|ٷ|/ҳıƵ|¼|ٷ|/ҳ
IGBT-С᣺
IGBT:
ͨģ

1IGBTоƬй
2йأ|¼|ٷ|/ҳIGBTռձȳTj߶|¼|ٷ|/ҳ
3йأVgeӶС

ģ

1IGBTоƬй
2빤йأ뿪ƵѹTj߶
3йأRg|¼|ٷ|/ҳżضϵѹӶС|¼|ٷ|/ҳ

FWD:
ͨģ

1FWDоƬй
2빤йأFWDռձȳ|¼|ٷ|/ҳ

ģ

1FWDоƬй
2빤йأ뿪ƵѹTj߶

ϵͳܵģ
IGBTܵPTrΪ̬ͨ뿪֮ܵPDΪ̬ͨĺͿ֮ԱƵΪ|¼|ٷ|/ҳϵͳܵPtotΪ6IGBT6֮
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