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I have a general question: How inductor limits the Inrush current to a Electrical load

Posted by: dinu.paulson on

Question: How inductor limits the Inrush current to a Electrical load                 My understanding is : when the rate of  current flow  trough inductor is changed that will induce a voltage in the inductor and it ll oppose the change in current. During start-up of electrical load, It can take huge amount of current called inrush current. Since inductor oppose the change of current it can be used as a inrush current limiter. Time varying voltage in the inductor is given by .  
                        V= L di/dt
                               Suppose the inrush current rating is 100Amps/200uS. 230V AC inductive load.  the inrush concern is nearly eliminated as the peak inrush will be less than 10A                 What all thins I have to consider to design to pick a inductor value..? Thanks in advance

Comments

Submitted by PI-Tucker on 07/17/2012

An inductor merely limits the rate of rise of current, but not the peak current., unless you consider that it connects to a bulk capacitor.


All the series resistances (e.g. input EMI filter, thermistor, bridge diodes, AC mains standard output impedance), and capacitance of the bulk capacitor all play a role.  Then the inductance will have an effect on peak current.

 

Try running a simulation, where at time t=0, Vinput= 320V.