What do the Q and D values of a capacitor mean and why are they important?

Due to the existence of these parasitic parameters, the total impedance of the real part rather than the ideal capacitive device consists of two parts, the real part and the imaginary part, expressed as: If the leakage between the electrodes can be ignored, i.e. the impedance of Rp is infinite (or much larger than the impedance of Ls(ESL) Rs(ESR) C with respect to the capacitance C), then the equivalent circuit above can be further simplified to the following ternary model (as shown). where ESL is the equivalent series inductance Ls and ESR is the equivalent series resistance Rs. From this simplified circuit model, the total impedance of the capacitive device can be obtained as a function of frequency, as shown. Due to the existence of the equivalent series inductance LS, as the signal frequency f increases, the capacitive reactance XC of the capacitor C decreases, while the inductive reactance XL of the equivalent series inductance Ls of opposite polarity increases. At some frequency f0, XC = -XL. At this time, the total impedance of the capacitive device |Z|=Rs, we call this frequency point f0 as the self-resonant frequency (SRF). When it is less than the SRF frequency, the device has capacitive characteristics. Inductance characteristics The Q value is equivalent to the reciprocal of the D value. The loss angle is the D value: generally the D value of the electrolysisMore info please click