数控直流线性稳压电源设计与改进
Design and Improvement of Digital Controlled DC Linear Stabilized Power Supply

线性稳压电源采用STM32单片机作为主控芯片，使用内部数模转换DAC控制方法，以功率管线性电路为核心电路，实现直流线性稳压电源。单片机输出模拟电压之后，经过OP07运算放大器以及跟随器控制功率管TIP122的基极电压，进而控制输出电压。电路使用高精度采样芯片ADS1256采集直流电压反馈至单片机通过PID算法调节DAC输出的电压大小。经实际研究，改进了减少输出电压纹波的方法。本电源输出电压较为稳定，负载调整率在1%以下。本电源在市电供电时能够输出稳定0~9.9 V可调的直流电压，支持预设电压值以及电流限流值，并设有过流短路保护、输出波形改变功能，输出的电压纹波不超过30 mV。
The linear stabilized power supply adopts STM32 single-chip microcomputer as the main control chip, uses the internal digital-to-analog conversion DAC control method, and uses the power tube linear circuit as the core circuit to realize the DC linear stabilized power supply. After the single-chip microcomputer outputs the analog voltage, the OP07 operational amplifier and follower control the base voltage of the power tube TIP122, and then control the output voltage. The circuit uses the high-precision sampling chip ADS1256 to collect the DC voltage and feedback it to the single-chip microcomputer to adjust the voltage output by the DAC through the PID algorithm. After actual research, the method of reducing the output voltage ripple has been improved. The output voltage of this power supply is relatively stable, and the load regulation rate is below 1%. This power supply can output a stable 0~9.9 V adjustable DC voltage when power is supplied, supports preset voltage values and current limit values, and is equipped with over-current short-circuit protection; output waveform change functions, and the output voltage ripple is not More than 30 mV.