Capacitor switching inrush current is too large

How does inrush current affect a capacitor bank?

The inrush current affects the whole system from the power source to the capacitor bank, and especially the local bus voltage which initially is depressed to zero. When the switch closes to insert the second capacitor bank, the inrush current affects mainly the local parallel capacitor bank circuits and bus voltage.

How do you calculate inrush current in a capacitor?

The amount of inrush current into the capacitors is determined by the slope of the voltage ramp, expressed as Equation 1: Where IINRUSH is the amount of inrush current caused by a capacitance, C is the total capacitance, dV is the change in voltage during ramp up and dt is the rise time during voltage ramp up.

How does voltage affect inrush current?

As the voltage increases, an inrush of current flows into the uncharged capacitors. Inrush current can also be generated when a capacitive load is switched onto a power rail and must be charged to that voltage level. The amount of inrush current into the capacitors is determined by the slope of the voltage ramp as described in

What happens if a switch closes to insert a second capacitor?

When the switch closes to insert the second capacitor bank, the inrush current affects mainly the local parallel capacitor bank circuits and bus voltage. What would cause a Restrike when Switching Capacitors? grounded cct.

What happens if a capacitor is left uncharged?

When power is initially applied to the system, charging these capacitors can result in an inrush current which can exceed the nominal load current. If left unaddressed, this can cause voltage rails to fall out of regulation, resulting in the system entering an undesired state.

How to reduce power supply dip due to inrush current?

Power-Supply Dip Due to Inrush Current You can reduce inrush current by increasing the voltage rise time on the load capacitance and slowing down the rate at which the capacitors charge. All TI load switches feature a controlled output slew rate to mitigate inrush current. Figure 3 shows the typical application circuit for a load switch. Figure 3.