As more and more new communication base stations are built, communication switching power supplies are needed to realize the conversion of AC power to DC power supply for communication loads. In this process, communication switching power supplies not only perform energy conversion functions, but also need to collect various electrical parameters, such as voltage, Various parameter indicators such as current, power, and electric energy ensure that the communication switching power supply can operate normally under safe conditions.
In order to ensure the safety of the communication switching power supply system of the communication base station, and at the same time, in order to facilitate the remote online monitoring of the equipment’s operating status and the environmental conditions of the equipment, it is also necessary to collect the environmental conditions in the communication switching power supply system, such as temperature sensors, humidity sensors, fire Sensors, water immersion sensors, access control sensors and other auxiliary safety monitoring and protection systems; the analog signals output by these sensors generally use 4-20mA current signals as data transmission, and the use of this analog signal has certain advantages.
The analog signal 4-20mA is a current signal type, and it adopts a two-wire acquisition method. This acquisition method is not easily affected by the interference of external environmental conditions. At the same time, when the upper limit of the current signal is selected as 20mA, which is lower than this threshold data, the spark energy caused by its on-off is safe enough, and will not cause the ignition of combustible gases and reduce the risk of fire; while the lower limit of the current signal is selected When 4mA is not lower than this threshold data, when the transmission line is disconnected due to a fault, the corresponding loop current drops to 0mA, so the current signal of 2mA is usually selected as the disconnection alarm value; this simple application serves as the overall The auxiliary function of the communication switching power supply system is relatively practical and reliable.
In addition to the communication switching power supply equipment in the communication base station, there are also equipment such as AC power distribution products, dynamic environment monitoring modules, etc. These devices are equipped with analog signal acquisition interfaces to facilitate the access or The signal access of collecting sensor devices realizes remote online real-time monitoring of the operation status of the entire communication base station, thereby improving the safety performance of the entire communication base station.