Hello!
I have an SMPS design, that I use pretty often. I designed it with EasyEDA and ordered the PCB via JLCPCB. The problem is, that when I power it up (by connecting it to a 20V DC laptop charger), it makes a huge spark. I guess its because the inrush current, since it has 4x470uf low esr caps on the main voltage line.
It works otherwise, but the sparking is annoying and I want to reduce it. I was thinking about having an inrush current limiting circuit on the main line, however, I am pretty dumb, and I don't know how to make it. I was thinking about an NTC thermistor (because that seemed to be the easiest way), but I couldn't find one that can carry 5A current, that my PSU needs from the 20V source.
Do you have any ideas? Maybe someone that can give me a good schematic?
Thanks in advance.
I have an SMPS design, that I use pretty often. I designed it with EasyEDA and ordered the PCB via JLCPCB. The problem is, that when I power it up (by connecting it to a 20V DC laptop charger), it makes a huge spark. I guess its because the inrush current, since it has 4x470uf low esr caps on the main voltage line.
It works otherwise, but the sparking is annoying and I want to reduce it. I was thinking about having an inrush current limiting circuit on the main line, however, I am pretty dumb, and I don't know how to make it. I was thinking about an NTC thermistor (because that seemed to be the easiest way), but I couldn't find one that can carry 5A current, that my PSU needs from the 20V source.
Do you have any ideas? Maybe someone that can give me a good schematic?
Thanks in advance.