基于单片机的直流稳压电源设计及其应用研究

age stabilizer is one of the commonly used equipment in electronic technology, widely used in teaching, research and other fields. Traditional DC voltage stabilizers are almost always adjusted by rotary switch, with low adjustment accuracy, difficult control, large size, complex structure, and frequent jumps, making them inconvenient to use. By integrating single-chip digital control technology into the design of the DC voltage stabilizer, a digital DC voltage stabilizer with digital display, digital input voltage regulation, and high voltage regulation accuracy can be designed. Moreover, through software programming, it is easy to implement function expansion. The current development of digital power supplies mainly focuses on higher digital control accuracy and resolution, better dynamic characteristics, better environmental performance, intelligence and high reliability, and a wider range of applications. In this design, AT89S51 is used as the main control chip to control the output voltage of the digital-to-analog conversion module DAC0832, and the output is amplified by the operational amplifier OPA552. Four keys are set to realize the increase and decrease of the voltage, and a digital display module is included. It can achieve an accuracy of 0.1V per step, with an output voltage range of 0~15V and a current of up to 200mA. Keywords: digital power supply; AT89S51; DAC0832; OPA552.