Humidity alarm circuit and device

• Main Authors: LIU DEFU, ZHANG JINSHAN, GUO ZHONGGAO, YAO FEI, LAN QIANHUI, GUAN HUISHAN
• Format: Patent
• Language: Chinese; English
• Published: 04.05.2021
• Subjects: ALARM SYSTEMS; ORDER TELEGRAPHS; PHYSICS; SIGNALLING; SIGNALLING OR CALLING SYSTEMS

The invention discloses a humidity alarm circuit and device, which belong to the technical field of humidity monitoring. The humidity alarm circuit comprises a partial pressure detection circuit, a reference circuit, a comparison amplification circuit and an alarm circuit. The partial pressure detection circuit comprises a humidity-sensitive element, and the voltage of the humidity-sensitive element changes along with the humidity of the environment where the humidity-sensitive element is located. The reference circuit is used for outputting reference voltage. The comparison amplification circuit is used for judging the magnitude relation between the voltage of the humidity-sensitive element and the reference voltage and controlling the alarm circuit to give an alarm when the voltage of the humidity-sensitive element is larger than the reference voltage. According to the humidity alarm circuit, the magnitude relation between the voltage of the humidity-sensitive element and the reference voltage is judged thr