便携式瓦斯报警器模块设计研究

Design on a novel portable gas alarm module

传统便携式瓦斯报警器电路中,比较器的基准电压是稳定的,常见的便携式瓦斯报警器电路包含比较器电路和振荡电路两部分。一种特殊结构的便携式瓦斯报警器模块电路,基准电压通过反向二极管连接滞回比较器的反相端,瓦斯体积质量信号通过反向二极管连接滞回比较器同相端,瓦斯体积质量升高,比较器的基准与输入角色换位,使得比较器兼具比较和振荡功能,比较器的输出电压极性不断发生变化,形成多谐振荡,推动喇叭实施报警。这种新颖的瓦斯报警器电路也可以对其他各种环境诸如水位、温度、压力等实施报警。

In the traditional portable gas alarm circuit,the reference voltage of the comparator is generally stable,so the common portable gas alarm circuit includes two parts:comparator circuit and oscillation circuit.A portable gas alarm module circuit with unusual structure was designed,and the reference voltage was connected to the reverse phase of the comparator via reverse diode.The signal of gas density was connected to the same phase of the hysteretic comparator via the reverse diode,the gas density increased.The role of reference and input of the comparator was interchanged,thus the new comparator was of the function of comparison and oscillation.The polarity of the output voltage of the comparator changed continuously so as to form multi-resonance oscillation and impel the horn to give an alarm.The novel gas alarm circuit could also alarm for water lever,temperature and pressure etc.