Alarm system having phase-sensitive bridge circuit

作者： Kiyoshi Sone , Keishin Tsuchiya , Kazuhito Saito , Takeshi Abe , Ichiro Yoshihara

DOI:

关键词: Reservoir capacitor 、 Electrical engineering 、 Thyristor 、 AC/AC converter 、 Zero cross circuit 、 AC adapter 、 Phase-fired controllers 、 Engineering 、 AC power 、 Electronic engineering 、 Thyristor drive

摘要: An alarm system for detecting a dangerous condition such as the increase in content of or presence toxic inflammable gas air and giving warning signal. The comprises an AC power supply, full-wave rectifier connected to supply rectifying alternating current from source into direct current. bridge circuit includes sensor element at least one branch. operational amplifier is supplied with receives input signal which output delivered through DC blocking capacitor. A thyristor parallel its control gate amplifier, main electrodes series indicator actuable when triggered conduction state. Such triggering occurs voltage reverses phase by 180°, i.e., resistance varies exists.