Investigation on Non-contact Measurement of DC Voltage Using Inverse Piezoelectric Effect

A non-contact DC voltage measurement method based on the principle of electric field coupling and inverse piezoelectric effect was proposed to solve the invasiveness and safety issues of contact measurement techniques on the original circuit. An experimental measurement system was built using a piezoelectric ceramic buzzer as a sensing probe. The results show that the measurement system can achieve non-contact DC voltage measurement, with a relative measurement error ≤3.33 % in the measurement range of 4.5~25 V. The measurement method proposed in the article eliminates the mechanical structure part of the traditional measurement method and has good research and application prospects.