瓦斯报警器的电路设计  

Circuit design of gas alarm

作　　者：贾洁[1] 王玉巧[1] 

机构地区：[1]黄河科技学院,河南郑州450063

出　　处：《电子设计工程》2014年第1期94-96,共3页Electronic Design Engineering

基　　金：郑州市嵌入式系统应用技术重点实验室建设项目(121PYFZX177)

摘　　要：本电路首先将220V交流电变为12V直流电压来为整机供电,并应用气敏传感器MQ-2把瓦斯气体浓度这一非电量转换为电信号,再经由运算放大器μA709将该信号与门限电压比较,由电压比较器转化为数字信号并控制由LM555数模集成电路组成的双稳态触发电路最后应用继电器来控制报警电路和通风设备,从而实现报警。The power supply 220 V AC into 12 V DC in all circuit. It was application of gas sensors with MQ-2 that converte the concentration of the gas-electricity to electrical signals, through μA709 of operational amplifiers and the signal voltage compare with the threshold, the voltage by comparison with control into a digital signal from analog integrated circuit components LM555 The bistable trigger circuit, a further relay to control the alarm circuits and ventilation equipment, thus realizing the police.

关 键 词：瓦斯 气敏传感器 μA709 LM555 报警 

分 类 号：TN-9[电子电信]