Author(s)

Dongwen Yan, Xinyan Hu

Corresponding Author

Dongwen Yan

ABSTRACT

: In order to meet the demand of open and customized power supply in teaching experiment, taking PIC single chip microcomputer as the monitoring center, an adjustable voltage stabilized power supply of Buck circuit is designed, which integrates PID control, voltage monitoring and temperature monitoring. The switch tube of the Buck circuit is moved to the lower branch to simplify the drive circuit; the operational amplifier circuit is used for voltage sampling transformation to improve the anti-interference ability of the feedback signal; in order to improve the voltage steady-state control accuracy, two improved strategies are designed, namely the output voltage average filter and the PID control quantity scale transformation. The simulation and experimental results show that when the input voltage and load change greatly, it can be quickly stabilized on the preset value, and has high steady-state accuracy.

KEYWORDS

PIC single chip microcomputer; Buck circuit; PID control; stabilized power supply; temperature monitoring; average filtering