Main Structure and Working Principle of Prepaid Electricity Meter

Main structure and working principle of prepaid electricity meter

1. Main structure

The flame retardant ABS shell is adopted, which is strong, sealed and shielded.

2. Working principle diagram

The electric energy meter obtains the voltage sampling signal from the voltage divider, and the current sampling signal is obtained from the current divider. The voltage-current product signal is obtained through the multiplier. After frequency conversion, a count pulse whose frequency is proportional to the product of voltage and current is generated. Through frequency division, the stepper motor is driven to measure electricity.

3. Data processing

The electric energy metering pulse is sent to the CPU for processing by the photocoupler, and stored in the non-volatile EEPROM after the operation. The computer management information system, through the IC card reader, writes a certain amount of electricity and the IC card required for monitoring into the microprocessor system in the table, and after the CPU operation, prompts display, alarm, and cut-off status signals.