»ùÓÚµ¥Æ¬»úµÄdÀ๦·ÅÉè¼Æ

±àºÅ£º

±ÏÒµÉè¼ÆËµÃ÷Êé

Ìâ Ä¿£º »ùÓÚµ¥Æ¬»úµÄDÀ๦·ÅÉè¼Æ Ôº £¨Ïµ£©£º¹ðÁÖµç×ӿƼ¼´óѧְҵ¼¼ÊõѧԺ ר Òµ£º µç×ÓÐÅÏ¢¹¤³Ì ѧÉúÐÕÃû£º ÀÇå ѧ ºÅ£º 010113304650 Ö¸µ¼½Ìʦ£º ÍõÓ¾ü

Ö° ³Æ£º ½² ʦ

ÌâÄ¿ÀàÐÍ£º ÀíÂÛÑо¿ ʵÑéÑо¿ ¡Ì ¹¤³ÌÉè¼Æ ¹¤³Ì¼¼ÊõÑо¿ Èí¼þ¿ª·¢

2013 Äê 10 ÔÂ 25 ÈÕ

¹ðÁÖµç×ӿƼ¼´óѧ±ÏÒµÉè¼Æ£¨ÂÛÎÄ£©±¨¸æÓÃÖ½

µÚ 1 Ò³ ¹² 3 Ò³

Õª Òª

Êý×Ö¹¦·ÅÓÉÓÚÆäЧÂʸߡ¢Ò×ÓëÊý×ÖÒôÔ´¶Ô½ÓµÈÓÅµã¶øÔÚÏÖʵÉú»îÖоßÓÐÔ½À´Ô½¹ã·ºµÄÓ¦Óᣱ¾Éè¼Æ»ùÓÚµ¥Æ¬»úÖÆ×÷ÁËÒ»¿îDÀ๦·Å¡£¹¦·ÅϵͳÀûÓõ¥Æ¬»úµÄADת»»¹¦Äܽ«ÊäÈëµÄÒôƵÐźÅת»»ÎªÕ¼¿Õ±ÈËæÄ£ÄâÐźŵçѹ±ä»¯µÄPWMÐźţ¬¾­¹¦ÂÊ·Å´óÆ÷·Å´óËæÊäÈëÒôƵ±ä»¯µÄPWMÐźţ¬ÔÙÓɵÍͨÂ˲¨Æ÷°ÑPWM²¨ÐÎÖеÄÉùÒôÐÅÏ¢½âµ÷³öÀ´¡£ÏµÍ³ÒÔÄÚ´øADת»»Æ÷µÄ8051Äں˵¥Æ¬»úSTC12C5410ADΪÒôƵ²É¼¯ºËÐÄ,Óɵ¥Æ¬»úÄÚ²¿Ë㷨ת»»³ÉSPWMÐźš£ÏµÍ³µÄ·Å´ó²¿·Ö²ÉÓù¦ÂÊÐ͸ßËÙMOSFETD¿ª¹Ø¹Ü×é³ÉÍÆÍì·Å´óµç·£¬Ö÷ÒªÓÃÀ´PWMÐźŷŴó,×îºóÀûÓÃLCµÍͨÂ˲¨Æ÷¶ÔÂö³åÐźŽøÐÐÆ½»¬´¦Àí£¬»¹Ô­³öÉùÒôµçÐźţ¬×îºóͨ¹ýÑïÉùÆ÷À´×ª»»Êä³ö·Å´óÁ˵ÄÉùÒôÐźš£¾­ÊÔÑéÑéÖ¤£¬±¾ÎÄÖÆ×÷µÄDÀ๦·Å£¬¾ßÓй¦ºÄµÍ¡¢³É±¾µÍ¡¢µç·¼òµ¥¡¢ÒôÖʽϺõÈÓŵ㡣

¹Ø¼ü´Ê£ºÊý×Ö¹¦·Å£»STC12C5410AD£»ÍÆÍì·Å´ó£» PWM£»µÍͨÂ˲¨Æ÷

¹ðÁÖµç×ӿƼ¼´óѧ±ÏÒµÉè¼Æ£¨ÂÛÎÄ£©±¨¸æÓÃÖ½

µÚ 2 Ò³ ¹² 3 Ò³

Abstract

Digital power amplifier because of its advantages of high efficiency, easy to dock with the digital audio source and has more and more widely used in real life. This design based on single chip microcomputer made a class D power amplifier. Power amplifier system using MCU AD conversion function converts input audio signal duty cycle change with analog signal voltage PWM signal, the PWM power amplifier amplification change with the input audio signal, and then by the low-pass filter demodulation of the PWM waveform sound information. System with the AD converter within 8051 kernel microcontroller STC12C5410AD as the core audio collection, internal algorithm converts the SPWM signal by single-chip microcomputer. Amplification part of the system of using power type high-speed MOSFETD switching tube push-pull amplifier circuit, mainly used for PWM signal amplification, finally using LC low pass filter to smooth the pulse signal, the reduction of noise signals, finally through the speaker to the transformation output amplified voice signal. Verified by test, this paper made of class D power amplifier, has low power consumption, low cost, simple circuit, good sound quality, etc.

Key words: Digital power amplifier; STC12C5410AD; Push-pull amplifier; PWM. Low pass filter

¹ðÁÖµç×ӿƼ¼´óѧ±ÏÒµÉè¼Æ£¨ÂÛÎÄ£©±¨¸æÓÃÖ½

µÚ 3 Ò³ ¹² 3 Ò³

Ŀ ¼

1 Ð÷ÂÛ ........................................................ 1

1.1 ¿ÎÌâ±³¾° .............................................................. 1 1.1.1 DÀ๦·Å·¢Õ¹Àú³Ì .................................................... 1 1.1.2 DÀ๦·ÅµÄĿǰÏÖ×´ .................................................. 2 1.2 ±¾Éè¼ÆÖ÷ÒªÑо¿¹¤×÷ .................................................... 2 1.3 ±¾Éè¼ÆµÄ½á¹¹ .......................................................... 3

2 ÒôƵ¹¦·ÅÓëSTC12C5410ADµ¥Æ¬»ú¼ò½é ........................... 3

2.1 ÒôÏäµÄÌØÕ÷¼°ÐÔÄÜ ...................................................... 3 2.1.1 ÉùÒôµÄÌØÕ÷ .......................................................... 3 2.1.2 ÒôÏìµÄ½á¹¹¼°²ÎÊý .................................................... 3 2.1.3 ·Å´óÆ÷µÄ¼¼ÊõÖ¸±ê .................................................... 3 2.2 ¹¦ÂÊ·Å´óÆ÷¼ò½é ....................................................... 4 2.2.1 AÀ๦ÂÊ·Å´óÆ÷ ...................................................... 4 2.2.2 BÀ๦ÂÊ·Å´óÆ÷ ...................................................... 5 2.2.3 ABÀ๦ÂÊ·Å´óÆ÷ ..................................................... 6 2.2.4 DÀ๦ÂÊ·Å´óÆ÷ ...................................................... 7 2.3 DÀ๦·ÅµÄÔ­Àí ........................................................ 7 2.3.1 DÀ๦·ÅµÄ¹¤×÷Ô­Àí .................................................. 7 2.3.2 DÀ๦·ÅµÄÓŵã ...................................................... 9 2.4 STC12C5410ADµ¥Æ¬»ú¼ò½é .............................................. 10

3 »ùÓÚµ¥Æ¬»úDÀ๦ÂÊ·Å´óÆ÷ϵͳ×ÜÌåÉè¼Æ ........................ 11

3.1 ϵͳ×ÜÌåÉè¼Æ·½°¸ ..................................................... 11 3.2 Ó²¼þϵͳ²¿·Ö ......................................................... 11 3.5 DÀ๦·Å ............................................................. 14 3.3 Èí¼þϵͳ²¿·Ö ......................................................... 15

4 ÕûÌåϵͳÓŵãºÍ´æÔÚÎÊÌâ¼°¸Ä½ø ............................... 18

4.1 ÕûÌåÉè¼ÆÓŵã ......................................................... 18 4.2 ´æÔÚÎÊÌâ¼°¸Ä½ø ....................................................... 18 4.3 Ó²¼þ°²×°ºÍµ÷ÊÔ ....................................................... 18

5 ×ܽá ....................................................... 18

ÖÂл ............................................................................................................................................................... 21 ¸½Â¼ ............................................................................................................................................................... 22

¹ðÁÖµç×ӿƼ¼´óѧ±ÏÒµÉè¼Æ£¨ÂÛÎÄ£©±¨¸æÓÃÖ½ µÚ 1 Ò³ ¹² 23 Ò³

1 Ð÷ÂÛ

1.1 ¿ÎÌâ±³¾°

ÔÚ¹ýÈ¥¼¸Äê£¬Ëæ×Å¿ÆÑ§¼¼ÊõµÄÈÕÐÂÔÂÒ죬µç×ÓÉ豸Ҳ¿ªÊ¼¸üл»´ú£¬¶øËæ×ÅÈËÃǶÔÉú»îÆ·ÖÊÒªÇóµÄÌá¸ß£¬ÒôƵÖÊÁ¿µÄºÃ»µÒ²³ÉΪÁËÈËÃǹØ×¢µÄ½¹µã¡£Èç½ñÐí¶àµç×Ó²úÆ·É϶¼Ôö¼ÓÁËÒôƵÉ豸£¬¶øÏÖÔÚµÄÏû·ÑÀàµç×ÓÉ豸ÉÏ´øÓÐÒôƵÒÔ³ÉΪÖ÷Á÷£¬ÈçMP3¡¢Æ½°åµçÄԵȡ£Ëæ×ÅÕâÀàЯ´øÓÐÒôƵÉ豸µÄµç×Ó²úÆ·µÄ·¢Õ¹£¬ÒôƵÉè±¸Ò²ËæÖ®·¢Õ¹£¬¼´ÈËÃǶÔÒôƵÐÔÄܵÄÒªÇó²»¶ÏÌá¸ß£¬ÐèÒªÒôƵÉ豸²»¶ÏµÄÌá¸ß£¬Æä»ù±¾ÒªÇóÊÇÔÚ¸üµÍµÄ¸ºÔØ×迹ºÍ¸ü¸ßÊä³ö¹¦ÂÊÏÂʵÏÖ¸üºÃµÄÒôÖÊ¡£¶ø¹¦ÂÊ·Å´óÆ÷ÊǶÔÒôƵ·Å´óµÄÉ豸£¬ÊǸ߱£ÕæÒôƵ·Å´ó´¦ÀíµÄºËÐIJ¿·Ö¡£Ò»°ã¶øÑÔ£¬AÀà¡¢BÀà¡¢ABÀà·Å´óÆ÷ÄÜÓ¦¸¶ÕâЩÉ豸ÔçÆÚµÄÐÔÄܺÍÒªÇóºÍ³É±¾ÒªÇ󣬵«ÏßÐÔ¹¦ÂÊ·Å´óÆ÷ÒÔ²»ÄÜÊÊÓ¦Èç½ñÏû·ÑÕßµÄÉú»îÐèÇó£¬Òò´ËÔÚÔöÇ¿ÒôƵ¹¦ÄܵÄÏû·ÑÆ·ÁìÓò£¬DÀ๦·ÅÕýÔÚÏòÏÈǰµÄÏßÐÔ¹¦·Å·¢ÆðÌôÕ½ £¬DÀàÒôƵ¹¦·Å´óÆ÷µÄЧÂÊÔ¶±ÈÄÇЩÏßÐÔ¹¦·Å¸ßµÄ¶à£¬ÀíÂÛÉÏÄÜ´ïµ½100%£¬¶øÊµ¼ÊÉÏÒ²ÄÜ´ïµ½85%ÒÔÉÏ£¬Èç½ñÒÔ¾­¿ª·Å³öÎÞÐèÊä³öÂ˲¨µÄDÀ๦ÂÊ·Å´óÆ÷¼¯³ÉоƬ£¬Ê¹µÃÒôƵ¹¦·ÅµÄµç·¸ü¼Ó¼òµ¥£¬Òò¶ø´ïµ½Á˼õСÌå»ýµÄЧ¹û£¬ÕâÑùµÄÌØµãÉèÖ®¸üÊÊÓÃÓÚ±ãЯ´øÊ½µç×ÓÉ豸ÖС£Èç½ñµÄLCD£¨Liquid Crystal Display£¬Òº¾§ÏÔʾÆ÷£©µçÊÓ»ú¡¢µÈÀë×ÓµçÊÓÒÔ¼°ÐÂÐÍPCµÈÐí¶àÖÕ¶ËÉ豸¾ùÒªÇóÌṩ¸ü¸ßµÄÊä³öЧÂÊ£¬¶ø²»ÊÇÔö¼Ó³É±¾£¬Í¬Ê±Òª±£³ÖÔ­ÓеÄÌå»ýÉõÖÁ¸üСµÄÌå»ý£¬ÕâÑùÔ­ÓÃÓÚ´ó¹¦ÂʵÄDÀ๦·Å½«Öð²½Ó¦Óõ½Ð¡¹¦ÂʵıãЯ´øÊ½²úÆ·ÖС£Æä¹¤×÷ÌØµãÊǹ¤×÷µçѹµÍ¡¢Êä³ö¹¦ÂÊ´ò¡¢×ª»¯Ð§Âʸߡ¢¹¦ºÄС¡¢ÔªÆ÷¼þ·âװС¡£ÕâÑùµÄÇ÷ÊÆ¼Ó´óÁ˶ÔDÀ๦·ÅµÄÒªÇó£¬Ê¹Ö®ÔÚ¶Ìʱ¼äÄڵĵõ½µÄ³¤×ã·¢Õ¹¡£²¢ÇÒÈç½ñÐí¶àDÀ๦·ÅÒÔ½øÈëÁËÔ­À´ÓÉÏßÐÔ¹¦·ÅÕ¼ÁìµÄÊг¡¡£Ïû·ÑÊг¡ÉÏÊÊÓÃDÀ๦ÂÊ·Å´óÆ÷µÄÔ­ÒòÖ÷ÒªÔ­ÒòÊÇÆäЧÂʸߣ¬ÕýÊÇÓÉÓÚÆäЧÂʸ߶øÊ¹Æä·¢ÈÈÁ¿Ô¶Ô¶µÍÓÚ´«Í³µÄÏßÐÔ¹¦·Å¡£DÀ๦·ÅÄÜ´ïµ½85%µÄЧÂÊÊÇÒòΪÆäÓ뿪¹ØµçÔ´µÄ¹¤×÷·½Ê½ÏàËÆ£¬ÆäÖÐMOSFETҪô¹¤×÷ÔÚ±¥ºÍ̬,Ҫô¹¤×÷ÔÚ½ØÖ¹Ì¬£¬Òò´Ë¿ÉÒÔ¼õÉÙ¿ª¹Ø¹Ü¾§Ìå¹ÜµÄ¹¦ºÄËðʧ£¬´Ó¶øÔöÇ¿ÁË·Å´óÆ÷µÄЧÂÊ£¬ÔÙ´ÎÒ²ÐèҪ˵Ã÷µÄÊÇÔÚ¿ª¹ØÊ±¼äºÍ·Ç¿ª¹ØÊ±¼äÖÐ×Ü»áÓÐÒ»¶¨µÄËðºÄ£¬ÎÞÂÛÈç½ñµÄ¼¼ÊõÈçºÎ·¢´ïÒ²²»ÄÜʵÏÖij¸ö»úÆ÷Äܽ«Ð§ÂÊ´ïµ½100%¡£ÕæÊÇÆä¿ª¹ØÌØÐÔ£¬Éè·Å´óÆ÷ʵÏÖÁ˸ßЧÂʵÄת»»¡£Ò²¾ÍÊÇ˵DÀ๦·ÅµÄЧÂÊÊÇÈç½ñÒÑ¿ª·¢³öÀ´µÄ¹¦ÂÊ·Å´óÆ÷ÖÐЧÂÊ×î¸ßµÄ¹¦ÂÊ·Å´óÆ÷¡£ÏÂÃæ¾Í½«¶ÔDÀ๦·ÅµÄ·¢Õ¹Ê·×öһϼòÒª½éÉÜ¡£ 1.1.1 DÀ๦·Å·¢Õ¹Àú³Ì

ÔÚÒôÏìÁìÓòÀïÈËÃÇÒ»Ö±¼áÊØ×ÅAÀ๦·ÅµÄÕ󵨡£ÈÏΪAÀ๦·ÅÉùÒô×îΪÇåÐÂ͸Ã÷£¬¾ßÓкܸߵı£Õæ¶È¡£µ«ÊÇ£¬AÀ๦·ÅµÄµÍЧÂʺ͸ßËðºÄÈ´ÊÇËüÎÞ·¨¿Ë·þµÄÏÈÌìÍç¼²¡£BÀ๦·ÅËäȻЧÂÊÌá¸ßºÜ¶à£¬µ«Êµ¼ÊЧÂʽöΪ50%×óÓÒ£¬ÔÚСÐͱãЯʽÒôÏìÉ豸ÈçÆû³µ¹¦·Å¡¢±Ê¼Ç±¾µçÄÔÒôƵϵͳºÍרҵ³¬´ó¹¦Âʹ¦·Å³¡ºÏ£¬ÈÔ¸ÐЧÂÊÆ«µÍ²»ÄÜÁîÈËÂúÒâ¡£ËùÒÔ£¬Ð§Âʼ«¸ßµÄDÀ๦·Å£¬ÒòÆä·ûºÏÂÌÉ«¸ïÃüµÄ³±Á÷ÕýÊÜן÷·½ÃæµÄÖØÊÓ¡£ ÓÉÓÚ¼¯³Éµç·¼¼ÊõµÄ·¢Õ¹£¬Ô­À´Ó÷ÖÁ¢Ôª¼þÖÆ×÷µÄºÜ¸´Ôӵĵ÷ÖÆµç·£¬ÏÖÔÚÎÞÂÛÔÚ¼¼ÊõÉÏ»¹ÊÇÔÚ¼Û¸ñÉϾùÒѲ»³ÉÎÊÌâ¡£¶øÇÒ½üÄêÀ´Êý×ÖÒôÏì¼¼ÊõµÄ·¢Õ¹£¬ÈËÃÇ·¢ÏÖDÀ๦·ÅÓëÊý×ÖÒôÏìÓкÜ

ÁªÏµ¿Í·þ£º779662525#qq.com(#Ìæ»»Îª@) ËÕICP±¸20003344ºÅ-4