The overall structure of this design is roughly composed of a main control module, a current signal sampling module, a power module and a serial port output module. The main control chip in this article uses a microcontroller model STM32F103RC. Under the premise of ensuring the accuracy of current sampling, the structure is as simple as possible, avoiding complex and changeable circuit layout, making it more convenient to make PCB boards, and the cost is relatively low. Among them, in the design of the sampling and conditioning circuit, a current transformer is used to sample the current signal.
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