The working principle of the prepayment energy meter

The prepayment energy meter consists of two main functions: one is the electric energy metering part, which uses a special integrated electric energy metering chip(prepayment energy meter) to calculate the sampling signals of voltage and current, generate metering pulses representing electric energy, which are directly used for electric energy error verification, and count electric energy to the functional processing part of MCU at the same time; The second is the microprocessor MCU control part, which calculates the electric energy according to the electric energy pulse of the metering part, exchanges data through the RF card interface, displays with a wide temperature range LCD, and controls the magnetic holding relay according to the set parameters to control the user's power consumption.