Design of Micro Digital Power Analysis and Detection Device

A power analyzer is an instrument used to test the performance of electrical appliances and troubleshoot electrical faults. At present, the power analyzer on the market generally has the disadvantages of difficult to use, high energy consumption, expensive and so on. Therefore, a micro digital power analysis and detection device is proposed in this paper, which can solve the above problems well. This device uses STM32F407 as the core processor, combined with the OPA227,TLC2254A and other precision operational amplifiers to form the core part of the device. The transformer circuit in the device can collect the power signal of the electrical equipment, and convert the power signal into a low-level signal that can be collected by ADC through the conversion circuit and digital phase discriminator, and then transmit it to the MCU for FFT calculation and filtering processing. Finally, the parameters such as active power and total harmonic distortion (THD) are displayed on the screen, so as to analyze the performance and state of the electrical equipment. The experimental results show that the device has the advantages of low power consumption, less cost and simple use when the measurement parameters are accurate.