Electrical performance of X7R MLCC under large signals
In order to better apply multilayer ceramic capacitors(MLCC)under high power,it is necessary to evaluate the electrical performance of MLCC under large signals.By measuring the capacitance,the sampling resistance and the effective AC voltage after series connection with the voltammetry method,the phase difference between the capacitor and the sampling resistor was obtained,the capacitance and dielectric loss of the capacitor were calculated,and the data map for large signal operation of MLCC was established.The results show that when the AC voltage is constant,the capacitance increases with the increase of the bias voltage.When the AC voltage is small,the loss almost does not change with the change of the bias voltage.Under high DC bias,the capacitance and dielectric loss increase with the increase of the AC voltage.Under certain bias voltages,the capacitance does not change with the change of the AC voltage within a wide range.The capacitance could keep constant when the bias voltage and the AC voltage are changed at the same time.As a result,the contradiction between the existing electrical parameters of the materials or components and practical application requirements can be partially solved.
large signalbiasAC voltageMLCCcapacitordielectric loss
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