Power MeterTechnical RequirementsVoltage-Sensing CircuitDesign ExplanationSlide 5Simulation ResultsPower Meter Power Meter ECE 4512 Senior Design IDepartment of Electrical & Computer EngineeringMississippi State UniversityTechnical Requirements•Voltage-sensing circuit (0 to 120 Vrms)•Current-sensing circuit (0 to 30 A)•Power Measurement Range (0 to 3600 W)•Display (4-digit LCD)•Power Factor Calculation (DS87C520 Microcontroller)•Energy Measurement (0 to 86.4 kWhrs)•Power (9 V Battery)•Tolerance (+/- 3%)•Size & Packaging (Plastic enclosure – 4” x 8” x 1.5” (W x L x D))Voltage-Sensing CircuitDesign Explanation12RR))(*21(1234VVRRVo IDA (Instrumental Differential Amplifier)•High-input impedance•Filtered noise•Overall gain of 1 calculated as follows:Design ExplanationSimulation Results Voltage Input (Vp-p) Vo (Vp-p) Vo Scaled by 36 Percent error (%)180 5.0103 180.371 0.206170 4.7319 170.348 0.205160 4.4536 160.33 0.206150 4.1752 150.307 0.205140 3.8969 140.288 0.206130 3.6185 130.266 0.205120 3.3402 120.247 0.206110 3.0618 110.225 0.205100 2.7835 100.206 0.20690 2.5052 90.1872
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