ÄÚÈÝ·¢²¼¸üÐÂʱ¼ä : 2025/10/1 22:02:48ÐÇÆÚÒ» ÏÂÃæÊÇÎÄÕµÄÈ«²¿ÄÚÈÝÇëÈÏÕæÔĶÁ¡£
¿ª¹ØµçÔ´Éè¼Æ±¨¸æ
Ò»¡¢ ϵͳÔÀíÓëÀíÂÛ·ÖÎö¼ÆËã
±¾ÎÄÒÔUC3842ΪºËÐÄ¿ØÖƲ¿¼þ£¬Éè¼ÆÒ»¿îDC36V~60VÊäÈ룬DC6.5V/4AÊä³öµÄµ¥¶Ë·´¼¤Ê½¿ª¹ØÎÈѹµçÔ´¡£¿ª¹ØµçÔ´¿ØÖƵç·ÊÇÒ»¸öµçѹ¡¢µçÁ÷Ë«±Õ»·¿ØÖÆÏµÍ³¡£±ä»»Æ÷µÄ·ùÆµÌØÐÔÓÉË«¼«µã±ä³Éµ¥¼«µã£¬Òò´Ë£¬ÔöÒæ´ø¿í³Ë»ýµÃµ½ÁËÌá¸ß£¬Îȶ¨·ù¶È´ó£¬¾ßÓÐÁ¼ºÃµÄƵÂÊÏìÓ¦ÌØÐÔ¡£Æäµç·ÔÀíͼÈçͼ1Ëùʾ¡£
T113£º3£º7C12.2nR15KUH20ÊäÈëµçѹ £º36~60VDCR243KC31000u16VC41000u16VC51000u16VFR105IFR630C225V22uR522C60.1u1R1340KC7100pF2COMPVREF8U1R410KR30.1/2WFR105R7470R8150R620K£¨µ÷ÖÁ16K×óÓÒ£©VFBUC1VCC7PC817R10C10C83ISENOUT63470p1KR14C92.2nF4RT/CTR1520KGND5R11C121k100pF22.7K2.2nFC11D20.01uF1£¨µ÷ÖÁ1K×óÓÒ£©TL431R910K
ͼ1µç·ÔÀíͼ
1¡¢¼òÒª½éÉܯ乤×÷ÔÀí£º
±¾µç·ÓÐÈý²¿·Ö×é³É£ºÖ÷µç·£¬¿ØÖƵ緺ͱ£»¤µç·¡£ÆäÖÐÖ÷µç·²ÉÓõÄÊÇ
µ¥¶Ë·´¼¤Ê½µç·£¬ËüÊÇÉý½µÑ¹±ä»»Æ÷µÄÍÆÑݲ¢¼Ó¸ôÀë±äѹÆ÷¶øµÃ¡£´Ëµç·µÄÓŵãÊÇ£ºµç·¼òµ¥£¬ÄܸßЧÌṩֱÁ÷Êä³ö£¬ÇÒËüÊÇËùÓеçÂ·ÍØÆËÖÐÊäÈëµçѹ·¶Î§×î¿íµÄ¡£Õâ¶ÔÓÚÊäÈë»·¾³¶ñÁÓ·¢ÈȸºÔØÊ±±È½ÏºÃµÄ¡£ËüµÄȱµãÊÇ£ºÊä³öÎÆ²¨½Ï´ó£¬µ«Õâ¿ÉÒÔͨ¹ýÔÚÊä³ö¶ËÔö¼ÓÒ»¼¶LCÂ˲¨Æ÷À´¼õÐ¡ÎÆ²¨¡£ÕâÖÖµç·ͨ³£ÊʺÏÓ¦ÓÃÔÚÊä³ö¹¦ÂÊÔÚ250WÒÔÏ£¬µçѹºÍ¸ºÔصĵ÷ÕûÂÊÔÚ5%~8%×óÓҵĵç·ÖС£·´¼¤Ê½µç·ҲÓеçÁ÷Á¬ÐøºÍµçÁ÷¶ÏÐøÁ½ÖÖ¹¤×÷ģʽ£¬µ«ÖµµÃ×¢ÒâµÄÊÇ·´¼¤Ê½µç·¹¤×÷ÓÚµçÁ÷Á¬ÐøÄ£Ê½Ï»áÏÔÖø½µµÍ´ÅоµÄÀûÓÃÂÊ£¬ËùÒÔ±¾ÎÄÉè¼Æµç·¹¤×÷ÔÚµçÁ÷¶ÏÐøÄ£Ê½Ï¡£
¿ØÖƵç·ÊÇ¿ª¹ØµçÔ´µÄºËÐIJ¿·Ö£¬¿ØÖƵĺûµÖ±½ÓÓ°Ïìµç·µÄÕûÌåÐÔÄÜ£¬ÔÚÕâ¸öµç·ÖвÉÓõÄÊÇÒÔUC3842ΪºËÐĵķåÖµµçÁ÷ÐÍË«±Õ»·¿ØÖÆÄ£Ê½¡£¼´ÔÚÊä³öµçѹ±Õ»·µÄ¿ØÖÆÏµÍ³ÖÐÔö¼ÓÖ±½Ó»ò¼ä½ÓµÄµçÁ÷·´À¡¿ØÖÆ¡£µçÁ÷ģʽ¿ØÖÆ¿ÉÒÔʹϵͳµÄÎȶ¨ÐÔÔöÇ¿£¬Îȶ¨ÓòÀ©´ó£¬¸ÄÉÆÏµÍ³µÄ¶¯Ì¬ÐÔÄÜ£¬Ïû³ýÁËÊä³öµçѹÖÐÓÉÊäÈëµçѹÒýÈëµÄµÍÆµÎÆ²¨¡£
±£»¤µç·ÊÇ¿ª¹ØµçÔ´Öбز»¿ÉÉٵIJ¹³ä£¬ÔÚÕâ¸öµç·ÖÐÒýÈëÁËÊäÈë¹ýÁ÷±£»¤¡¢Êä³ö¹ýÁ÷±£»¤¡¢Êä³ö¹ýѹ±£»¤¡¢¹ýÈȱ£»¤µÈ¡£ÆäÖÐÊäÈë¹ýÁ÷±£»¤ÊÇͨ¹ýÔÚÔ±ßÒýÈëÈ¡Ñùµç×èR14£¬½Óµ½UC3842µÄ3½Å£¬µ±R14Éϵĵçѹ³¬¹ý1V£¬»á¹Ø¶ÏPWMµÄÊä³ö´Ó¶øÆðµ½±£»¤×÷Óã¬Êä³ö¹ýѹ±£»¤ÊÇͨ¹ýÊä³öµçѹ·ÖѹºóË͵½Îó²î·Å´óÆ÷µÄ·´Ïà¶Ë£¬ºÍµçѹ»ù×¼±È½Ï´Ó¶øÀ´¿ØÖÆR9µÄµçѹ£¬À´¿ØÖÆUC3842µÄÊä³öÕ¼¿Õ±È£¬´ïµ½Êä³öµçѹÎÈѹµÄ×÷Óá£C6ÓÃÀ´Â˳ýоƬ·´À¡ÍøÂçµ÷½ÚÎó²î±È½ÏÆ÷µÄÊä³ö¶Ë£¨1½Å£©µÄ¸ßƵµü¼ÓÐźš£R5Ϊ¿ª¹Ø¹ÜµÄÇý¶¯µç×裬һ°ãÔÚ10¡«100¦¸È¡Öµ£¬±¾µç·ȡ22¦¸¡£R5Ô½´ó£¬¿ª¹Ø¹Üµ¼Í¨Ô½Âý,¿ª¹Ø¹ÜÉϵÄËðºÄÒ²Ô½´ó¡£ R4È¡10k¦¸×óÓÒ£¬Ö÷ÒªÊÇ·ÀÖ¹MOS¹ÜÕ¤¼«Ðü¿Õ¡£C10¡¢R10Æð¶ÔÈý¶ËÎÈѹ¹ÜTL431 ÄÚ²¿·Å´óÆ÷½øÐÐÏàλ²¹³¥µÄ×÷Óá£C7¡¢R13ÊÇUC3842Îó²î·Å´óÆ÷µÄ²¹³¥ÍøÂç¡£
µ±ÏµÍ³ÊäÈëµçѹʱ£¬µç·ÏÈÓÉÆô¶¯µç×èR2£¨43k¦¸£©ÌṩÆô¶¯µçÁ÷ºó£¬ÓÉ×ÔÀ¡ÏßȦ¡¢¶þ¼«¹ÜFR107¡¢C2¹¹³É¸¨ÖúµçÔ´, ,ʹUC3842µÄ7½Åµçѹ´ïµ½16Vʱ£¬Ê¹UC3842 Æô¶¯²¢ÓÐÊä³ö, ʹMOS ¿ª¹Ø¹Üµ¼Í¨, ÄÜÁ¿´æÖüÔÚ±äѹÆ÷T 1ÖÐ.´Ëʱ,ÓÉÓÚ¶þ´Î²à¸÷·ÕûÁ÷¶þ¼«¹Ü·´ÏòÆ«ÖÃ,¹ÊÄÜÁ¿²»ÄÜ´«µ½T 1 µÄ¶þ´Î²à, T 1 µÄÒ»´Î²àµçÁ÷ͨ¹ýµç×èR14 ¼ì²â²¢ÓëUC3842 ÄÚ²¿ÌṩµÄ1V »ù×¼µçѹ½øÐбȽÏ, µ±´ïµ½ÕâÒ»µçƽʱ,¿ª¹Ø¹Ü¹Ø¶Ï, ËùÓбäѹÆ÷µÄÈÆ×鼫ÐÔ·´Ïò, Êä³öÕûÁ÷¶þ¼«¹ÜÕýÏòÆ«ÖÃ, ´æÖüÔÚT 1 ÖеÄÄÜÁ¿´«Êäµ½Êä³öµçÈÝÆ÷ÖС£Æô¶¯½áÊøºó, ·´À¡ÏßȦµÄµçѹÕûÁ÷ºó¾È¡Ñùµç×è·Öѹ»ØË͵½Îó²î·Å´óÆ÷µÄ·´Ïò¶Ë(½Å2) ºÍUC3842 ÄÚ²¿µÄ2.5V»ù×¼µçѹ×÷±È½ÏÀ´µ÷ÕûÇý¶¯Âö³å¿í¶È, ´Ó¶ø¸Ä±äÊä³öµçѹÒÔʵÏÖ¶ÔÊä³öµÄ¿ØÖÆ¡£ÕâÑù, ÄÜÁ¿Öܶø¸´Ê¼µØ´æÖüÊÍ·Å, ¸øÊä³ö¶ËÌṩµçѹ¡£
2¡¢µç·Ö÷Òª²ÎÊýµÄÉè¼Æ
1£©¡¢·´¼¤±äѹÆ÷Éè¼Æ
±äѹÆ÷µÄÉè¼Æ¼ÆËãÊÇÕû¸öµçÔ´Éè¼ÆµÄ¹Ø¼ü£¬ËüµÄÉè¼ÆºÃ»µÖ±½ÓÓ°ÏìµçÔ´ÐÔÄÜ¡£ ÒÑÖªÒªÇó
ÊäÈëµçѹ£ºVmin=36VDC Vmax=60VDC Êä³öµçѹ£ºVo=6.5V Êä³öµçÁ÷£ºIo=4A
£¨1£©¹¤×÷ƵÂʺÍ×î´óÕ¼¿Õ±ÈÈ·¶¨
Ñ¡¶¨¿ª¹ØÆµÂÊf=100kHz£¬ÔòÖÜÆÚT?10us¡£ÒòΪ¿íÊäÈË·¶Î§£¬²ÉÓõçÁ÷¶ÏÐøÄ£Ê½¡£ÔÚ¿íµçѹÊäÈËʱµ±ÊäÈëµçѹΪ×îСʱȡ×î´óÕ¼¿Õ±ÈDmax?0.42,¸´Î»Õ¼¿Õ±ÈDr?0.45£¬±£Ö¤Õû¸öÊäÈëµçѹ·¶Î§ÏÂ(D?Dr)?1¡£
£¨2£©¼ÆËã±ä±È£º ±ä±È¿ÉÓÉÏÂʽ¼ÆËãµÃµ½£º
L1Ui'?Dn??'?T L2Uo?Dr'ʽÖÐ?TΪ±äѹÆ÷ЧÂÊ£¬Ui'ºÍUoΪ±äѹÆ÷³õ¼¶µçѹºÍ´Î¼¶µçѹ£»Ò»°ã±äѹÆ÷
ЧÂÊ?T=0.95~0.98£¬°üº¬µ¼ÏßÍËðºÄ¡¢´ÅоËðºÄÒÔ¼°Â©¸ÐÒýÆðµÄ¼®Î»ËðºÄ£¬ÕâÀïÈ¡?T=0.95¡£
'?Uo?U2, U2Êä³öUi'min?Uimin?Us£¬UsΪÊäÈ˵ç·ËùÓÐѹ½µ£¬ÕâÀïÈ¡1V; Uoµç·ÖÐËùÓÐѹ½µ£¬°üÀ¨ÕûÁ÷Æ÷ѹ½µ¡¢µçÁ÷È¡Ñùµç×èѹ½µºÍÏß·ѹ½µµÈ£¬ÕâÀïÈ¡1V¡£ÓÚÊÇÓУº
L1Ui'?D35?0.42 n??'?T?0.95?4.36
L2Uo?Dr7.5?0.45£¨3£©´Î¼¶µç¸ÐÁ¿L2ºÍ³õ¼¶µç¸ÐÁ¿L1
L2??Uo'Dr?2fPo'2'£¬Ê½ÖÐPoΪ±äѹÆ÷Êä³ö¹¦ÂÊ¡£´úÈëÊý¾ÝµÃ£º 2L2??Uo'Dr?2fPo'(7.5?0.45)2??1.9uH 2?100?103?7.5?4
¸ù¾Ý±ä±ÈµÃµ½³õ¼¶µç¸ÐÁ¿L1Ϊ
L1?n2L2?4.362?1.9?36.1uH