多层陶瓷电容器直流偏置大信号电学响应测量及建模OA

State-of-the-art electrical response models for multilayer ceramic capacitors(MLCCs)are predominantly based on direct current(DC)-biased small-signal with low alternating current(AC)portions.These modes fail to meet the rigorous design requirements of high-density,high-efficiency power electronic converters due to considerable deviations when applied to large-signal operating scenarios.Comprehensive measurement and accurate modeling of MLCC electrical responses under DC-biased large-signal conditions are performed.First,a temperature-varying DC-biased large-signal measurement platform was developed,integrated with a custom-designed AC/DC superimposed power supply.This source delivered adjustable voltage waveforms from 0 V to 400 V,with a total harmonic distortion of less than 1%within a continuous frequency range from 10 kHz to 100 kHz.Second,a Sawyer-Tower circuit was employed to systematically measure the electrical responses of MLCCs under various DC biases,excitation frequencies,and ambient temperature conditions.Wide-temperature,frequency-dependent DC-biased hysteresis loops were acquired,from which key electrical parameters such as capacitance and equivalent series resistance were extracted.Finally,high-precision electrical response models for MLCCs under DC-biased large-signal operation were established via automatic feature engineering,yielding an average relative error of only 5.5%against experimental measurements.This work paves the way for the precise deployment of MLCCs and the rigorous design of high-density,high-efficiency power electronic converters.