A Digital System for High-Speed Measurement of Capacitance under Transient Stress Impact

Multilayer ceramic capacitors (MLCCs) are often used in transient high stress impact scenarios, with a stress impact pulse width of sub milliseconds. In order to study the dynamic characteristics of MLCCs under impact stress, it is necessary to obtain the capacitance and its variation of MLCCs during the stress action time. This paper designs a digital system for high-speed capacitance measurement, which can obtain the transient voltage of MLCC and store it in non-volatile memory. A prototype was designed with a data conversion period of 160ns. The functionality of the prototype was verified through Hopkinson pressure bar impact experiment. The transient capacitance of MLCC was calculated based on the transient voltage value, achieving high-speed and accurate measurement of capacitance.