Isolated Voltage Sensor Using Ring Resonator for Battery Power Management

The electrostatic ring resonator is newly applied for measuring the voltage in a highly isolated manner. The principle is the resonant frequency shift caused by the electrical field. The ring resonator is for increasing the natural frequency and Q. The realized values are 100kHz and 320, they are more than 4- and 2-times increase compared to the previous translation type resonator. The measurement over 380V matches with the need.