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Inrush-current limiter circuits (ICL) with Triacs and ...
AN4606. Application note Inrush-current limiter circuits (ICL) with Triacs and Thyristors (SCR). and controlled bridge design tips Introduction At application start-up, a high current can be sunk from the mains due to transient energy demand to start the system. Such inrush current could come from motor start-up, DC. capacitor charge or the low value of resistor impedance at cold temperature. A high inrush current can cause several issues for the system like component failure (fuse, bridge diode, etc.) but also represents an excessive current stress on the power grid compared to the nominal current sensed in steady state. Indeed, if nothing is implemented to limit the inrush current, the start-up current can easily be 10 to 20 times higher than the steady-state current. The power grid wires and other current protection components have then to be rated to deliver such high current for a short time.
March 2016 DocID027054 Rev 2 1/26 26 AN4606 Application note Inrush-current limiter circuits (ICL) with Triacs and Thyristors (SCR) and controlled bridge design tips
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