Abstract: To solve the compatibility problem of AC and DC power supply of the sensor,A linear regulated power supply suitable for the sensor is designed,which can be powered by both 24 VDC and 220 VAC.At the same time,multiple protection functions of input overvoltage protection,output overvoltage protection and output current limiting protection are possessed,which greatly improves the universality and safety of the sensor.The working principle of each part of the power supply,as well as the optimization and adjustment methods for specific parameters,are described from the aspects of theoretical design and simulation analysis.Finally,the correctness of the design is verified by experimental tests.

Key words: Linear regulated power supply, AC/DC power supply, Overvoltage protection, Current limiting protection