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功率开关管功耗计算方法_发动机转速

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

KAITONGSHIDIANLIUDEZUIXIAOZHIIon-min(A) 0.222

KAITONGSHIDIANLIUDEZUIDAZHIIon-max(A) 0.644

GUIGESHUSHANGDEDAOTONGDIANZURon-resistance(homn) 3

2) 开关管由开通到关断的功耗测试

YOUKAITONGDAOGUANDUANDESHIJIANToff-rise(nS) 100 (CELIANGDIANYABOXINGDESHANGSHENGSHIJIAN,DANWEIns)

YOUKAITONGDAOGUANDUANDIANYADEZUIDAZHIVoff-max(V) 288

YOUKAITONGDAOGUANDUANDIANLIUDEZUIDAZHIIoff-max(A) 0.637

3) 开关管由关断到导通时的功耗测试

YOUGUANDUANDAODAOTONGDESHIJIANTon-fall(nS) 47 (CELIANGDIANYABOXINGDEXIAJIANGSHIJIAN,DANWEIns)

YOUGUANDUANDAODAOTONGDIANYADEZUIDAZHIVon-max(V) 198

YOUGUANDUANDAODAOTONGDIANLIUDEZUIDAZHIIon-max(A) 0.491

4) 周期时间的测量

KAIGUANZHOUQISHIJIANTperiod(uS) 11.6762

KAIGUANGUANDEKAIGUANSUNHAOPswitch(W) 0.327087666

KAIGUANGUANDEDAOTONGSUNHAOPon-resistance(W) 0.477385448

KAIGUANGUANDEZONGGONGHAOPloss(W) 0.804473114

5) 温度降额的计算

JIEDIANDAOBIAOMIANDEREZURjc(℃/W) 10

KAIGUANGUANDEZUIGAOGONGZUOWENDUTmax-spec(℃) 150

GAOWENCEDEDEKAIGUANGUANBIAOMIANWENDUTmax(℃) 81.8 89.8

KAIGUANGUANDESHIJIWENDUJIANGE(%) 59.9

计算公式:

Ploss=Pswitch+Pon-resistance

Pswitch=(1/6*Voff-max*Ioff-max*Toff-rise+1/6*Von-max*Ion-max*Ton-fall)/Tperiod

Pon-resistance=(0.5*(Ion-min+Ion-max))^2*Ton/Tperiod

JIANGE(%)=(Tmax+Rjc*Ploss)/Tmax-spec*100%

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