power unit

October 05, 2001 Denis Rybakov wrote to Stepan Pologov about ·Power supply·
KF>>> 1. There are high-capacity capacitors in the 220 volt circuit,
SP>> In addition to filtering, they are used to create a zero, and they are designed
SP>> for 150 volts, and in the event of a short circuit on one of them there is a lot more.
DR> Well finally... And where do you buy this shit?
6 pieces with such air conditioners were delivered almost in a row.
DR> I have very
DR> decent air conditioners for 400V, 220 μf.
So it was assembled by a normal company, not the Chinese.
DR> Besides, I extremely doubt the fact you described, since
DR> theoretically, even in a _not_ emergency situation, the total
DR> voltage on the capacitors can be close to 380V, i.e.
DR> each of them should _at least_ be 200 volts, this is the most
DR> extreme case, although in this situation you can only hope
DR> in the Almighty that something is a little skewed somewhere.
I understand that this is so it should be, but the fact remains, and the power supply with such
condensers works quite well, but they bring them often, apparently precisely because of this.
SP>> They don’t burn out, but break through, and the base-collector goes to the breakdown,
SP>> which
DR> in a given mode almost instantly causes a breakdown
DR> base-emitter, but this very short period of time often
DR>enough to carry out the base circuits as well.
Perhaps, simply when the BC breaks down, the transyuk completely opens and the EB breakdown occurs, at the next moment the 2nd transducer opens, trying to short-circuit the
network voltage, and it has a EB breakdown.
SP>> leads to short circuit in circuit 220.
DR> as a consequence.
SP>> After the breakdown of the transistors, the conditions for its combustion are more than
SP>> favorable..
DR> Undoubtedly.
I think it’s time to finish this here, because This is off topic here.