显示器电源电路

?????÷???????·
???????????????÷?????????????÷???????????????¤×÷?????è???á?????¨???±?÷?????????????·???????÷???????°?ì???ó???????????????????????á?ì?????·?¤×÷?????¨?????????????¤????????????????????????????±??????????????????????????÷??????????·??ú???????????¨?è???·?????à?±??????

???????????????????????±?÷???±?÷±??????????????????????÷???????÷?????¨???????????¨?±?÷?????????¨??±??????·?ò?÷?????·±??????¨???±?÷??????????°??????????í??·??????????÷???????????????????÷?????????????????????????÷???????ù±????????????÷?????????????????????????????÷??????±é????????????????????·??????ú?ú???????????÷????????????·????????÷???????????????????????????????????????????????????????÷???????????????·???????????????????÷?¤×÷?????????·?????ú×????????ù±????ó??

a???????????????????????????·??×÷??????°??????¨?????÷220V??????????±??????¨???±?÷???????????ò???±?????????¨?????ó???ò??????????±??????ó?±?????????·???????????¨??±????±?÷????????±??¤???????????·?????????????????¤×÷??

???°???????÷???????±?????????????÷130??260V????±????±???ò??????±???±????ó?±?????????÷???????ü?ò??????????×????????????????¨???±?÷??????????±???????

b?????¨?????????????±?÷???????ù?????÷??·????ù?¨×??ó?????±?÷??·???±????????¨???????????????????????¨?????ó???á???????¤????±??????????·?¤×÷???????¨??

C??????????±??¤???·????·??????????·?ò???÷?????????????????????÷?????????è????????±??¤???·???±???????????ó?±?????????????¤×÷????????????

d???????§?????????§???????á?????????????ú?????????????°?ì???·???¤×÷?·?????¤?????????×??????????

5??l?????????÷???????????ù±????í

?????????÷????????????????·???±??????ì???????¤???????????????????????????????§???????????????·?ò????????????????±ê???????ò????????????????????·?????????

?ü??×é??·??ò????5??l??l?ù????????????????±????÷?????÷???¨???·???????
??·????·?×é??????????±????÷??×÷??????220V???÷????????±??±?÷?????????????????÷?????????÷???¨???·??×÷?????????÷???????÷?????¨???ú?ú???????¨???????ó???????¨???±?÷??????×÷

?????????·???????????????÷???·??°??¨???÷?????¨???÷?????????÷?????????????¨???·??
°??????ò???????????¨?????????·???????????÷????????????????????????×÷???????ü???ü
?????ù???????????ò????±????é???°?±?÷?????·???¤×÷×?????±??¤?±?÷???????????¨??±???

?????????????÷?????????????????·???¤×÷???í?????????ò????????5??l??2?ù???????·
??×÷?¨???í??????????±???×è R????????×è Rl?à????????????????????????????????
Uout ??????????Uin???????????? Uout?? ILX RL?? Uin?? UR?? Uin??
ILX R?????????·????????±ê ?????±????????Uin?ò????Rl±????±??????±???????????????????Uout?ù±????¨??±???????
?????????????????????????????????????¨??????±ê?????±????????Uin±?????????????
?±??????????????????????Uout±????±???????é????????L?????÷Il????±?????±?????
????????????????????±???×è R????????IL X R????????????Uin?????????±????
RL±??? ????±????±??????Uout??IL??L??±????ò???ó???????÷IL??????????5??1??2?????·??????????
?±Uin??±????????????÷IL????????R???????·??×???×è???????????????÷IL???á????????
?ù??????????????×èL??Uout??±?????????????????????±?????????????±????????????¨??
??±???×èR??±??¤??????????±???

???????·????±???×è
R??×è???????ù?????????? Uin???¨???é???°??????????×è RL??±????é??×????÷?????ò??????×?????????????????5-l-3????×??????????·???????ò?????ü???ó?????ù???ù×???????±???·??ó???????÷?????·??????·?×é???????????????????????÷?????·?????????????????à?±?????????÷×è??????×è???ü??×è????±???·??ó?÷?????????÷?????·?÷?????????????????????????????÷???????±?????????ù?????÷·??ú±????±???ü??????????·??????????????§??×è??e??????±??????ò??????????±???×è???????????ù???·??×÷????????????????????????????±??????????????????ù????????·??????????????¨???é??????°??ü????±???·??ó?÷???????????????ù×?????????±???·??ó?÷?á?????????¨??±?????????????×÷??±?????±ê×???±???·??ó?÷??×÷?????????ù???????ù×?????×÷±???????????±??????á?????????????????÷?????·???????????????????????????????·??????±??·??·??????????·???ü???????????????è????????

?????ù???·?ì??????????????±???????????????±???·??ó???·?????????¨??±????ù×?????????±???·??ó??±???·??ó???·???????ó??????????·?????????????±????é?????????ó???????????????÷?????·?????????????÷????????±??ü????×è???????????????¨??±???

????????5??1??4???????÷???????????????ù±????·??????TI??????±????÷????????D1
??D4×é?????????÷???·??C1?????¨???????é??·??ò???????·?????????·??????Q1???????÷??????
Q2??±???·??ó????
R3??
R4×é?????????????ù???·??
RZ????????
ZD1?á???ù×??????????????????ó?????????????±
C1????????????
Uin?????ò???????????á?¨
RL???ó??????????????
Uout???????÷???±??
W1??·????????????ù????????????
Q2???ù??????
Ub2????????
Q2??·??????????ò??????????
ZD1??????×÷·???±?????±????ò??
Q2·????á???ò??????????
Q2???????????÷
IcZ??????
Q2????????????
UC2?????????÷????Q1?ù??????????????
Q1·????á????????????????
Uout??????????
Q1??·?????????±?????????
Q1·????á??????????????
Q1?ù?????÷
Ib1???????????????÷
Icl?????????????ò????
Q1??????????·???????????×èRoe???????????????ó????Uout???????????????????è????????????×???Uin??
RL?????¨·??§??±????±??????????Uout?ù±?±??????¨???±Uin???????òRL?????±???????à·???????Rce????????±???????????Uout???¨??±???

????????·??????????????????????????????ü???÷???????¤×÷??????·??ó?????????????ó?÷????±????????¨??????????·?????????????????uce??????uce??3V??????????uce?????????ó?????ó??????????????·??§???????±???á???ó???????·??±????÷???????????????????§??????Uce???????ò?????×???÷????????±????????????§??????×÷????????????????????
??????±?????±?????

???°???????????????????????????·????
LM78 X X?????????????¨???????? LM78 X X????°??ù????????×???·???9??????7805??7806??7809??7810??7812??7818??7824???ó??????×???±í???????????¨?????????ü????×??ó???????÷????
IA?????·??????°ü???÷???????ù×??????ù??±???·??ó??±??¤???·???·?????????????í??????°?·???????×é?????????????????????í?à???????????ü?????????ü???????????????è????????±??¤?????·???÷?????????·???????±?????è?????????????????è???÷??????·?·?±????????????¨???????????¨???°?????ì??????±ê????????
78 X X???????????????????????÷???ü??????????????????????????????

???????????????????÷???????????÷????
LM317?????????÷????????????