switch mode power supply troubleshooting

I still don't undertand Safety ground and System ground. I don't understand how a filter can block leakage current? The signal is AC so you could design a filter to cut-off before that frequency, but I believe its 60Hz and that would be blocking my incomming signal from hydro? Or would this filter be connected between ground and neutral? Or am I on the wrong track?Īfter reading hottip's post I'm wondering if the filter they are sending is to compensate for the filter that the switching power supply came with? So is the only way to stop the leakage current to dissconnect the EMI filter that the switch supply comes with? I ordered some of these 'EMI' filters from Sinpro becaause they claim it will reduce my leakage current from 4mA to 0.5mA. Thank you all this has been very informative. RE: Current Leakage Problwm with Switch Power Supply JimboJones21 (Electrical) Not the output (SYSTEM) ground(s) are connected to theĬhassis (SAFETY) ground is a noise issue only. The incoming supply ground, and that all equipment casesĪre connected to the same (SAFETY) ground. So, make sure the input filters have a ground path to Grounds are connected internally), and you have no Note that some SMPS manufacturers use aĬommon ground (the supply side and the converter output NO potential difference between case grounds until there Referenced to SAFETY ground (since this is the reference In general, most SMPS (switching supplies) incorporateĪ noise filter in the input circuit which should be Them at the same potential is usually a noise issue. Truly isolated SMPS, there should be NO, repeat NO, Ground and SYSTEM ground as a first step. Sounds like you need to distinguish between SAFETY

Switch mode power supply troubleshooting