Make Home Electricity Meter To Cut Bills!

Upasana Dewan

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For a domestic or small commercial environment, single-phase electricity meters help to cut down costs of a three-phase distribution network. Read on to view some ready-to-use single-phase meter reference designs which can calculate accurate energy bills for you. Furthermore, these designs come with many advanced features such as tamper detection which allow continued operation during power failure, LCD display for accurate calibration, and connectivity interfaces like RS-232, I2C and USB. Take a look!

Single Phase E-Meter for Low Cost and Power Needs based on PIC18F87J72:

electricity meter microchip

Here is a smart single-phase meter reference design that meets the cost and power requirements of a single-phase system. To cut down cost, the design uses a shunt for the current sensor in place of expensive current transformers. The design uses a PIC18F87J72 MCU with Analog Front End to drive the LCD and calculate the parameters like active/ reactive powers, RMS currents and voltages, forward/reverse energies, and more. To meet accuracy requirements, a Microchip’s energy meter software is provided to quickly calibrate and monitor the meter with the help of MCU. Click here to download the reference design.

Low-cost Single-Phase E-Meter with Tamper Detection:

e meter nxp

This is a simple and low-cost single-phase meter reference design that calculates active and reactive energy in both phase and neutral channels using a 32-bit MCU. A shunt resistor is used as a transducer for phase current sensing and a current transformer is used for neutral current sensing. The design includes tamper detection and can detect neutral missing with a current transformer and can log power-failure event with a built-in RTC. The Kinetis 32-bit ARM MCU with AFEs implements Discrete Fourier transformation (DFT) for accurate measurements. Click here to know more about the reference design.

Single-Phase E-Meter for Residential Metering with I2C:

The following reference design is a cost-optimised, high-performance single-phase meter for residential metering with two wire installations. It can be used in smart-grid applications by connecting to Zigbee network using the I2C interface. The design features a Kinetis MK30X256 ARM MCU for active and reactive power measurements that are displayed on a built-in LCD. The design includes cost-effective voltage sensing using an inexpensive resistor divider. The system can switch to low-power mode with the help of an in-built RTC operated by a 3V battery. The BOM of the system is kept low.Click here for detailed reference design.

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