- Microchip has released the reference design for its single-phase Anti-tamper energy meter kit
- The design concentrates on providing an advanced energy meter with anti-tamper monitoring.
Energy meters have a very important role to play in the power distribution business. The entire revenue generation is based on the energy consumption recorded by an energy meter. Any tampering with these meters directly affects the revenue generated by the company.
Single-phase anti-tamper energy meter
Microchip has released the reference design for its single-phase Anti-tamper energy meter kit. The MCP3911 and PIC18F85K90 Single-Phase Anti-Tamper Energy Meter is a fully functional single-phase meter with enhanced capabilities. It features functions such as battery backup, RTC and anti-tamper features.
The device features a real-time clock (RTC). It provides accurate data readings at any given instant of time. Unlike the clock generated by the microcontroller, it cannot be manipulated using high-frequency distortions. It also features an- inbuilt battery that is used as a reserved power source.
Measures channel voltage and current using dedicated drivers
According to the design, the developed device is rated at 5(60)A 220V 3200 imp/kWh IEC62053-22 Class 0.5 Energy Meter. The design features two different current channels. The current in these channels is measured with the MCP3911 device. The voltage of these channels is measured with the 12-bit SAR ADC. This ADC is integrated into the microcontroller. This design has two sensors for the current measurements: a current transformer and a shunt.
Uses tampering detection techniques
The design concentrates on providing an advanced energy meter with anti-tamper monitoring. This monitoring includes safety checks such as neutral monitoring, current circuit reversal, magnetic field disturbance and cover opening detection.
A dedicated software + UART communication
The PIC18F85K90 microcontroller directly drives the LCD that reduces the need for LCD drivers. It communicates with MCP2200 using UART communication protocol. It offers an isolated USB connection for meter calibrations. It also provides a method to calculate the overall device power.
This system calculates a number of energy characteristics such as active and reactive energy, active, reactive and apparent power, power factor, RMS current, RMS voltage and the line frequency. The Microchip Energy Meter Software is used to calibrate and monitor the system. The calibration can be done in either closed-loop or open-loop configuration. The design also features a low-cost capacitive power supply design.
This design is helpful in mitigating the theft threats related to the energy meters. The design incorporates all the design documents required for device development. All these files can be found here.