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The design and implementation of high precision and stable AC current supply plays an important role in the use of various electronic devices. In order to achieve the design requirements of high output accuracy, good stability and low uncertainty, STM32F407 Microcontroller Unit is used as the control core in hardware, high-precision current is generated through digital-analog conversion circuit, and closed-loop adjustment control system is realized with I/V conversion and sampling circuit. Based on the fast Fourier transform theory, the device adopts the technology of surface-source integration and uses liquid crystal display configuration screen as the human-computer interaction medium. The experimental results show that its accuracy can reach 5/10,000, its stability can reach 5/100,000, and its uncertainty can reach 1/1,000. It is suitable for various high-precision occasions.

Design of high precision AC current power supply based on STM32F407