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ղ    Ϊҳ
Ʒ
> IGBTɢ >

IGBT|¼|ٷ|/ҳĵЧ·ģ

뵼ԿʹòͬĵЧ·ģ
·ģ
 ͼ 1: ·ģ (Continued fraction circuit,ҲCauerģ, Tģͻ)
·ģ(Continued fraction circuit)Ӧ˴ڲİ뵼ʵ֪ÿIJʱ|¼|ٷ|/ҳܹģȻ|¼|ٷ|/ҳҪ ÿϵ·ͼʮ鷳ÿһ㣨оƬоƬӲƬƬӲװ壩ӦRCԪʾ|¼|ٷ|/ҳ˴·ģ͵ĸڵܹÿϵڲ¶Դhttp://www.peropierrot.com/sr/297.html
 ֲ·ģ
ͼ 2: ֲ·ģ (Partial fraction circuit,ҲFosterģͻpiģ)
·ģͲͬ|¼|ٷ|/ҳֲ·ģ(Partial fraction circuit)RCֲϲӦ|¼|ٷ|/ҳڵûκӦֲøģΪϵ״Ѳõɢеõ˸ģڽ¶ȷֲ
ڱӦֲֲ·ģеϵеrһʾ
һӣ
ֲ·ģеϵ
迹߷̼Tj㹫ʽ
˲̬迹
ֲ·ģк빦P(t), Tcase IGBT ķģ
ͼ 3: ֲ·ģк빦P(t), Tcase IGBT ķģ
ʵӦɢƬ¶Ȳܼ򻯼Ϊ㶨ֵΪɢƬʱ䳣ڵʱ䲻Ƕ̵ԺԵڷǹ̶ĹҪTcase(t )в߽IGBTģɢƬģ
ǵȽ
·ģµ¶ʱõȽRt h δ֪ĵȽZt hȻھֲ·ģ|¼|ٷ|/ҳһԾĹ뵽IGBTʱͨȽ¶漴˽ʵвڵĽַԱ
1) ɢƬZth ͨõӦû¶TcaseɢƬ¶Ths|¼|ٷ|/ҳȽѾɢƬ¶ȲͲٵֿ|¼|ٷ|/ҳ
2) IGBTѾ֪빦P(t)¶Tcase(t)ֱӲõӶͼ3õ
IGBTɢƬþֲ·ģͻ·ģ
ûĻ|¼|ٷ|/ҳ|¼|ٷ|/ҳĿǰеIGBTɢƬȲ·ģͼ·ģͺ;ֲ·ģͶṩIGBTĽᵽɢƬΧȴݹҪIGBTɢƬģͺϲһͻҪĸģ͵رIGBTɢƬǷֱ
·ģеIGBT ɢƬ
ۺϵ·ģ
ͼ 4: ۺϵ·ģ
·ģͺģӵĸϲģʹȴݹϲ㴫—ڵ·еĵ—һʱӳٺ󵽴ﲢɢƬ·ģͿͨһľֲ·ģͱ任õ
ͨṹÿһϷԪģԿԽһģֻڰijһضɢƬʱǿܵΪɢƬIGBTĴ໥õӰҲӦʱIGBTRthjcӰ|¼|ٷ|/ҳʵеɢƬõɢƬһôͲͨʵʵɢƬнģ
ֲһֲ·ģ͵IJ|¼|ٷ|/ҳΪǻڲõĽԼṩZthjcΪƵֲ·ģͱ任Ϊ·ģпܵ任һRth/CֵںܶԲͬRthCȡֵ|¼|ٷ|/ҳұ任µ·ģеRCֵͽڵ㶼ûȷ|¼|ٷ|/ҳһ任õIJ·ģͶӦ·ģͻִ
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