LTspice AC/DC convertor

[mading2018]

I noticed that I got so high (power w) losses in the diodes, that it is not reasonable (I think). Do I need to change my diodes in the rectifier bridge?
And in that case, which one would suit me best? It seems that I do not know what to select...

For 4 A - Diode 1 - 212 W, Diode 2 - 728u, Diode 3 - 332uW and Diode 4 - 212 W.

 

[alec_t]

The inrush current effect during the first quarter-cycle of the mains is what you are seeing. Two of the diodes of the bridge (D1 and D4) are subject to this but the other two are not. Since the mains phase position at power-up of a real circuit is not predictable, any of the diodes could be affected in practice, so all diodes should be the same type. An inrush-limiting NTC resistor could be used in series between the mains source and the bridge.

 

[mading2018]

An inrush-limiting NTC resistor

Aha I see. Is it enough to connect a regular resistor, lets say 1kohm or something. Or do I need to find a NTC resistor?
Do you know where I can find it?

--edit--
Hmm, I think I found something here. Would this work, if I used the parameters and the RNTC-resistor.

 

[alec_t]

Here's a link to some real-life limiters. You would select one based on the continuous current it needs to handle. You may be lucky and find a relevant spice model that works. Your sim in post #103 seems to grind to a halt.

 

[mading2018]

You may be lucky and find a relevant spice model that works.

Is it okay if simplify it by using a resistor instead, it seems hard to find one in LTspice :/

 

[alec_t]

A model of an NTC type would be better. The Yahoo LTS User Group may have one.

 

[mading2018]

I checked there, it seems they have one NTC file, but is an asy. file. Do you know how I can convert it or implement this type of file to my circuit?

I have seen somewhere that I should maybe write a SPICE directive as ".include something?"