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ud?¨????·??????¨???????ù???¨?±?÷???????? ud=(1/2??)u2sin??td(??t)=(0.45u2)[1+cos??)/2]-------------??1 ??????????????????×èRd?????±?÷???????????????????????ù????±??????ó?????????????±?÷????Ud?????????????????????÷???????ù???? ?÷??Rd???±?÷???÷Id?? Id=(Ud/Rd)=0.45(u2/Rd)??[(1+cos??)/2]--------------------------??2 Ud?????§???¨?ù·??ù?????? -------------------------------------??3 ?÷??Rd?????÷???§????

I=U/Rd=(U2/Rd)

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cos?×=P/S=

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?? 0?? 30?? 60?? 90?? 120?? 150?? 180?? Ud/U I/Id cos?× 0.45 1.57 0.707 0.42 1.66 0.698 0.338 1.88 0.635 0.225 2.22 0.508 0.113 2.87 0.302 0.03 3.99 0.12 0 - 0

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t1?±??????ug1??T1???¨?????÷?¨?·?????????ù????uT1=0,ud=u2,uT2=-u2??u2?????±??T1×????????? ??°????? t2?±??????ug2??T2???¨?????÷?¨?·?????é???ù????uT2=0??ud=-u2,ut1=u2??u2?????±T2×????????? 2???÷???????? ????3??????ud?¨????·??????¨????·ù????°??¨???÷????±????ù??Rd?????±?÷????Ud: Ud=0.9U2[(1+cos??)/2]--------------------------??6 ?±?÷???÷Id: Id=Ud/Rd=0.9(u2/Rd)??[(1+cos??)/2]-------------??7 ???????§??U??

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cos?×=

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±???Ud/U,I/Id??cos?×??????±?????????±í?????à???????ú??????4 ±í???? Ud/U??I/Id??cos?×??????????±í

?? 0?? 30?? 60?? 90?? 120?? 150?? 180?? Ud/U I/Id cos?× 0.9 1.112 1 0.84 1.179 0.985 0.676 1.335 0.896 0.45 1.575 0.717 0.226 1.97 0.426 0.06 2.835 0.169 0 - 0

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