一种基于555定时器和可控硅的自动呼救器设计

A design of automatic rescue beacon based on 555 timer and silicon controlled rectifier

目的:设计制作一种佩戴者突然倒地时,可以自动发出呼救信号,以便被人及时发现,得到急救的自动电子呼救器,而且该呼救器可以克服水银开关带来的中毒风险,呼救器报警后不受体位的影响。方法:采用9 V干电池供电,以集成电路NE555为核心,在携带呼救器人员倒地瞬间,利用位置开关触发可控硅接通电路持续报警。结果:制作出了可在倒地后不受体位影响,可持续发出呼救信号,直至救助人员关闭开关后停止呼救的自动电子呼救器。结论:该呼救器设计合理、价格低廉,尤其适合心脑血管疾病和癫痫等突发疾病患者和老人随身携带,克服了以前呼救器利用水银开关的风险和携带者体位变化时呼救器停止报警的缺点,具有良好的推广应用价值。

Objective To design an automatic rescue beacon which can send out alarm sound automatically in the case of sudden faint so that the patients can be found in time and receive emergency treatment, and simultaneously overcomes the risk of poisoning caused by mercury and wouldn＇t be affected by the carrier＇s position change. Methods The core part of the designed device was based on integrate circuit NE555, and the power was supplied by the dry battery of 9 V. Silicon controlled rectifier was triggered by the position switch as soon as the sudden faint takes place, and then the circuit was connected and sent out alarm sound. Results The designed automatic rescue beacon sent out continuous alarm sound for help until the rescuers shut down the power switch, and the carrier＇s position change didn＇t stop the rescue beacon from alarming. Conclusion The device has the advantages of reasonable design and low price, and is easy to carry, especially for the elderly and patients with cardiovascular disease, epileptic and other sudden diseases. The rescue device wouldn＇t stop the alarm because of carrier position changes and doesn＇t has the risk caused by mercury switch. The designed device is worthy of popularization and application.