红外反射式倒车雷达的设计与制作之令狐文艳创作

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令狐文艳创作

摘要

令狐文艳

本文主要介绍一种以一组基于红外发射与接收模块的倒车雷达电路。该电路由两部分构成，其中一部分是发射红外调制光的发射电路，主要是发射出红外调制光，另外一部分是红外接收、译码及发声电路。该电路工作时，发射装置发射的红外光反射回来被接收装置接受，接受后通过译码及发声电路，发出警报。发射电路组成了一个多谐振荡器，可以自由选定一个振荡频率。接收、译码电路这是这个设计的核心，内含红外专用集成电路CX20106，其内包含前放、载波选频、脉冲译码等电路，只有调整好其内的带通滤波器的中心频率 0与发射电路的发射频率一致，才能正常工作，此时，若红外接收管收到反射回的红外光，则IC2（CX20106）的输出呈低电位，使IC3触发呈置位状态（平时处低电位），为后级提供工作电压。IC4为语音集成电路，其内存语句为“嘟嘟，请注意”，为高电平触发，得电后把音频信号送给IC5

令狐文艳创作

（集成功率放大器LM386），经其放大后驱动喇叭发出报警语音。

关键词：红外光，倒车，报警

Abstract

This paper mainly introduced one kind device which built by infrared launches and the accepting blocks.The device including two blocks, one block is used to launch modulated infrared light , the other one is the infrared receive ,decoding and the sound producting.when this device is working, the launching device launch infrared light and the infrated is accepted by the receiving device, after decoding , the sound production electric circuit sends out the warning.The transmission circuit has composed a multivibrator which can be set frequency freely.The receive and decoding circuit is this design's kernal which

令狐文艳创作

including special-purpose integrated circuit CX20106 ,amplifer, the carrier chooser and pulse decoder.Only after adjusting the bandpass filter center frequency f0 to be consistent with the transmission circuit transmitting frequency, the device can work .when the infrared receiving tube receives the infrared light which reflects, IC2(CX20106)'s output assumes the low electric potential, causes IC3 to trigger be seted.IC4 is the IC for sounding,It's memory sentence is \high level triggering, after the electricity gived to IC5 (integration power amplifier LM386), the loudspeaker was actuated,then the warning would be sented.

Keyword：Infrared ray；Reverse the car; Alert

令狐文艳创作