基于STM32的矿用直流载波电话设计  

Design of Mine-Used DC Carrier Telephone Based on STM32

作　　者：吴克祥[1] 

机构地区：[1]池州职业技术学院机电技术系,安徽池州247000

出　　处：《电子器件》2015年第4期958-960,共3页Chinese Journal of Electron Devices

摘　　要：遵循矿用本质安全型电路的设计原则,结合煤矿井下通信的需要,提出了一种直流载波可拨号语音电话的设计方案,详细介绍了该电话的设计电路。该电话将咪头产生的语音信号放大后经LM567芯片调制成频率信号,经变压器耦合后再由12 V直流供电线路传送至其他语音终端,在各语音终端经LM567解调电路解调并由LM386放大,放大后的音频信号由扬声器输出。基于STM32单片机设计了拨号电路,拨号信息由CAN总线传送至各个电话终端。实测通话距离大于2 000 m,音量大于85 d B,效果良好。To abide by the design principles of mine intrinsically safe circuit,according to the need of underground communication in coal mine,a design scheme of DC carrier telephone was proposed which can directly dial. The design circuit of the telephone is introduced in detail. The telephone＇s voice signals are generated by the microphone. After enlarged then the voice signals are modulated to frequency signals by LM567 chip. The frequency signals are coupled by transformer and then transmitted by 12 V DC power supply line to the other voice terminals. In the voice terminal the signals are demodulated by LM567 demodulation circuit and enlarged by LM386,then the amplified audio signals are output from a speaker. The dialing circuit is designed based on the STM32 MCU. The dial information is transmitted to the other telephone terminals by CAN bus. The measured call distance is greater than 2 000 m,acoustic volume is larger than 85 d B,good results.

关 键 词：直流载波 电话 STM32 CAN总线 LM567 

分 类 号：TD65[矿业工程—矿山机电]