电梯五方对讲系统设计—毕业设计_精品.doc

电梯用五方对讲系统设计 摘 要 本文主要包括以下的内容，系统具有的特点，能够满足用户需要，适合于 关键词：  Round-lift system design with five parties Abstract Some manufacturers supply to the lift several well-known brands(including Hitachi Elevator,OTIS elevators, MITSUBISHI escalators) walkie-talkie have their own shortcomings, such as interference at the scene, calls voice was not clear enough. In the relatively large area, as compared monitoring households far from the center, a smart wiring distance, call signal attenuation, leading to the small voice calls. If simply will power amplifier input signal amplification, also is likely to result in distortion, it tends to create ascillation , is even more unacceptable side tone too large. Under the above circumstances, the proposed lift some improvement with Round-system design to meet the design requirements of human nature. This paper includes the following elements： linear amplifier and amplifier Magnification raise as much as possible in the circumstances without losing the power amplifier output signal with greater peak peak, this can reduce transmission relatively interference in the process. Through the audio input and output coupling transformer, impedance matching, achieving maximum power output. Increased output impedance, this can reduce the attenuation on the line. Fixed points after consecutive alarm function. Circuit again in the cook ascillation protection ﹑ Consumers side of the sound function. Keywords：voice clarity; long transmission distance; ascillation protection; Consumers side of the sound function.  目录 1 绪论 1 1.1概述 1 1.2对讲机使用现状 1 1.3 课题来源 2 1.4 控制系统简介 2 1.5功能描述 2 2 主机电路的设计 3 2.1主机电路原理的设计与实现 3 2.1.1用JRC4556功率放大器实现主机送话 4 2.1.2功率放大电路 4 2.1.3系统送话受话组成的原理 5 2.2内部电源控制电路 7 2.3振铃报警电路 7 2.4来电指示电路 9 2.5选择通话与通话指示电路 9 2.6主机的检验与小结 13 3分机电路的设计 14 3.1分机电路原理的设计与实现 14 3.2功率放大电路 15 3.2.1 TDA2822简介 15 3.2.2输出功率放大设计 16 3.2.3输入功率放大设计 17 3.3分机的电源供给控制电路 18 3.4分机控制电路设计 18 3.5啸叫保护电路 19 3.6分机设计的检验与小结 20 4 对讲系统组成 21 4.1监控母机单独与机房主机的控制 21 4.1.1监控母机与机房主机 21 4.1.2监控母机