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This review paper demonstrates a flexible nonintrusive current and voltage sensor tag with an interference reduction scheme for accurate electricity monitoring of the household appliances using typical SPT-2 18 AWG zip-cord power lines with wireless analysis using RF modem and ATmega16 microcontroller. Both current and voltage sensors with the design of a 50-turn inductive coil and two capacitive electrodes, respectively, in an area of 1.3 × 1 cm2 are fabricated on a 100-μm-thick flexible polyethylene terephthalate substrate as a sensor tag. The tag exhibits a sensitivity of 271.6 mV/A and 0.38 mV/V via active low-pass filter circuits for the current and voltage detection. A compensation circuit inputted with the signals of the voltage sensor is applied for the interference reduction of the current sensor electrically coupled with the power cord so that the current sensor can achieve better signal-to-noise ratio for measuring the loaded current of 1 A, 60 Hz on the power line.

Electricity Monitoring and Interference Reduction of Two-Wire Household Appliances Using Current and Voltage Sensor Tag