Prepaid Meter

Prepaid Energy Meters are based on the principle of microcontroller application. The Microcontroller will accept the number of units recharged by the concerned department person, counts the number of units consumed by the customer and as soon as the customer exceeds the recharged amount, it will disconnect the power supply to the customer until the next recharge. Whenever the number of units in microcontroller becomes zero, microcontroller sends a signal to “Contact Maker Breaker circuit” which is nothing but the relay and this relay cuts off the power supply to the consumer until next recharge. Figure: Block diagram of on line pre paid energy meter