- Joined Nov 5, 2011
What is the formula to calculate power in a capacitor circiit?
Just to be clear, W in these equations is energy in Joules stored on the capacitor, not power (which is energy per unit time).W = 0.5*C*V^2 --> divide both sides by 0.5*V^2
W/(0.5*V^2) = C
C = 180J/ (0.5 * 450V^2) = 1777uF
Q = C*V = 0.8C
Yep, any R-C snubber used in a switcher has power dissipation in the snubber resistor given by:If the capacitor is being charged and discharged at a specific frequency (f) then the power dissipated in the charge and discharge circuit in watts is f*C*V^2.
It's also the power dissipated by an amplifier or digital circuit driving a capacitive load. Charging and discharging the stray capacitance on a circuit board or internally in an IC is the primary cause of power dissipation in CMOS circuits.Yep, any R-C snubber used in a switcher has power dissipation in the snubber resistor given by:
Freq x C x V (squared)
Doesn't matter what the Ohmic value of the resistor is, same power.
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by Robert Keim