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An Auto-Balancing Scheme for Non-Contact AC Voltage Measurement

A simple, low-cost and non-contact type AC voltage measurement unit is presented here. The non-contact voltage sensor is designed to provide an output voltage that is directly proportional to the RMS value of unknown voltage being measured by the probe. The output is independent of the coupling capacitance between the probe and the insulated wire/cable under measurement. This is accomplished by a new, specially designed self-balancing signal conditioning circuit. This approach allows the sensor output to achieve less sensitivity to the variability of the probe to wire capacitances, good linearity and high accuracy over a range of voltage (0-300V) being measured. A prototype of the proposed probe and signal conditioning circuit has been designed, developed and tested in the laboratory. The result obtained established the practicality of the proposed scheme.