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## 71M6534 Datasheet(PDF) 55 Page - Maxim Integrated Products

 Part No. 71M6534 Description Exceeds IEC 62053/ANSI C12.20 Standards Download 132 Pages Scroll/Zoom 100% Manufacturer MAXIM [Maxim Integrated Products] Direct Link https://www.maximintegrated.com/en.html Logo

## 71M6534 Datasheet(HTML) 55 Page - Maxim Integrated Products

 55 / 132 pageFDS_6533_6534_00471M6533/G/H and 71M6534/H Data SheetRev 2552 Functional Description2.1 Theory of OperationThe energy delivered by a power source into a load can be expressed as:∫=tdttItVE0)()(Assuming phase angles are constant, the following formulae apply: P = Real Energy [Wh] = V * A * cos φ* t Q = Reactive Energy [VARh] = V * A * sin φ * t S = Apparent Energy [VAh] =22QP +For a practical meter, not only voltage and current amplitudes, but also phase angles and harmonic contentmay change constantly. Thus, simple RMS measurements are inherently inaccurate. A modern solid-stateelectricity meter IC such as the Teridian 71M6533 and 71M6534 functions by emulating the integral operationabove, i.e. it processes current and voltage samples through an ADC at a constant frequency. As long asthe ADC resolution is high enough and the sample frequency is beyond the harmonic range of interest, thecurrent and voltage samples, multiplied with the time period of sampling will yield an accurate quantity forthe momentary energy. Summing up the momentary energy quantities over time will result in accumulatedenergy.Figure 18: Voltage, Current, Momentary and Accumulated EnergyFigure 18 shows the shapes of V(t), I(t), the momentary power and the accumulated power, resulting from50 samples of the voltage and current signals over a period of 20 ms. The application of 240 VAC and 100 Aresults in an accumulation of 480 Ws (= 0.133 Wh) over the 20 ms period, as indicated by the accumulatedpower curve. The described sampling method works reliably, even in the presence of dynamic phaseshift and harmonic distortion.-500-400-300-200-100010020030040050005101520Current [A]Voltage [V]Energy per Interval [Ws]Accumulated Energy [Ws]