Hot answers tagged

3

It seems there are catastrophes and there are incidents of leakage current that may cause issues. I don't have any stats. A catastrophe is an average power (MVA) transformer that blows up every month around the world due to insufficient Condition Based Monitoring. (CBM) for H2 and other pyrotechnic gases dissolved gas in the oil. The UK uses a much higher ...


2

The multiple 1 MΩ resistors are part of the isolation barrier between the mains and the low-voltage side of the chip. Clearance and creepage are not an issue at the pins, because the chip itself prevents the voltages on those pins from getting too far from ground potential. The suggested layout doesn't show the resistors, but I assume that they would ...


1

I don't know what power factor requirements there are for such small appliances, but the cap is almost certainly there for EMI suppression, not for power factor. There's a good chance that it's 220nF because the company that designed it in has a standard input circuit, and that's it. If it were there to correct power factor, it would be there to ...


1

Class-X and Class-Y capacitors are safety-certified capacitors generally designed and used in AC line filtering in many electronic device applications. These safety capacitors are also known by other names, including EMI/RFI suppression capacitors and AC line filter safety capacitors. (EMI stands for electromagnetic interference and RFI stands for radio-...


Only top voted, non community-wiki answers of a minimum length are eligible