Inrush current/Switch-ON surge is the maximal instantaneous input current drawn by an electrical device when first turned on. Inrush current is much higher than the load’s steady-state current and that’s the source of many problems such as fuse blowing up, load failure, load’s lifetime reduction, sparks at the switch contacts … etc. I tried to address this problem with an easy, however effective solution. I have introduced two circuits for both AC and DC loads.
They're nice circuits, practical and useful. Nice work. Have you considered doing a DC one with a linear ICL circuit, using a current source, capacitor and MOSFET? They are also useful when inrush current level and/or required rise time fit together...
They're nice circuits, practical and useful. Nice work. Have you considered doing a DC one with a linear ICL circuit, using a current source, capacitor and MOSFET? They are also useful when inrush current level and/or required rise time fit together...
Thanks. may I ask you to explain a bit? You can control the current limit (inrush level) by changing the power resistor and also the delay for the relay activation
I just meant that in certain cases, the solution I mentioned is also an option, no switching in and out of devices and it is smaller: (two NPNs, one PMOS, two resistors and one capacitor) when a small voltage drop, the PMOS Rds(on), is not an issue that will affect circuit functionality. Every solution has pros and cons.
I just meant that in certain cases, the solution I mentioned is also an option, no switching in and out of devices and it is smaller: (two NPNs, one PMOS, two resistors and one capacitor) when a small voltage drop, the PMOS Rds(on), is not an issue that will affect circuit functionality. Every solution has pros and cons.