MCP3909 and dsPIC33F 3-Phase Energy Meter Reference Design (MCP3909RD-3PH3)
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The MCP3909/dsPIC33F 3-Phase Energy Meter Reference Design is a fully functional energy meter with many advanced features such as harmonic analysis, per phase distortion information, sag detection, four quadrant energy measurement, and active and reactive power calculation. It uses Microchip’s powerful 16-bit dsPIC33F Microcontroller Unit (MCU).
The MCP3909/dsPIC33F 3-Phase Energy Meter Reference Design is unique in the fact that all calculations take advantage of the dsPIC33F DSP engine, and all output quantities are calculated in the frequency domain through the use of direct fourier transforms (DFT). This approach yields a large volume of outputs for a variety of meter designs, from simple active power only energy meters, to advanced energy meters requiring harmonic analysis. Another significant advantage of this design, is that the dsPIC firmware implements a quasi-synchronous sampling algorithm, eliminating the need for external zero-crossing detection and PLL circuit for the synchronization of ADC samples to line frequency. The line frequency is measured in software and corrected for measurement errors caused by frequency fluctuations in the power grid. This additional processing on the dsPIC reduces the overall meter cost by eliminating the requirement for a PLL circuit.
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