1, capacity (Fala)
Inch: C = ( 0.224 × K · A) / T D
Metric: C = ( 0.0884 × K · A) / T D
2. Energy stored in the capacitor
E = 1â„2 CV 2
3, the linear charge of the capacitor
I = C (dV/dt)
4, the total impedance of the capacitor (ohms)
5, capacitive reactance (ohm)
XC = 1/(2Ï€fC)
6, phase angle Ф
Ideal capacitor: advanced current voltage 90o
Ideal inductor: hysteresis current voltage 90o
Ideal resistor: the same phase as the current voltage
7. Dissipation coefficient (%)
DF = tan δ (loss angle)
= ESR / X C
= (2Ï€fC)(ESR)
8, quality factors
Q = cotan δ = 1/ DF
9, equivalent series resistance ESR (ohms)
ESR = (DF) X C = DF/ 2Ï€fC
10, power consumption
11, power factor
PF = sin δ (loss angle) – cos Ф (phase angle)
12. Root mean square
13, kVA KVA (kW)
KVA = 2πfCV 2 × 10 -3
14, the temperature coefficient of the capacitor
TC = [ (C t – C 25 ) / C 25 (T t – 25) ] × 10 6
15, capacity loss (%)
16, the reliability of ceramic capacitors
17, the capacitance value in series
18, the capacitance value in parallel
C T = C 1 + C 2 + .... + C n
19. Againg Rate
AR = % ∆C / decade of time
The symbols in the above formula are as follows:
K = dielectric constant A = area T D = thickness of insulation layer V = voltage t = time R S = series resistance f = frequency L = inductance inductive coefficient δ = loss angle Ф = phase angle L 0 = service life L t = test Lifetime V t = test voltage V 0 = operating voltage T t = test temperature T 0 = operating temperature X , Y = effect index of voltage and temperature.
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