Transformer fed with pulsating DC

Asj

Jan 23, 2012
10
If transformer fed with pulsating DC what will happen . As far as DC pulse width is small nothing major will happen . Core will get magnetise and you have demagnetise the core by reversing the polarity

Asj

Jan 23, 2012
10
If Dc pulse is fed to transformer will there be any voltage transformation to secondary of transformer.

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
The most important thing is that (presuming the core isn't saturated) you will get an AC voltage on the secondary and some (possibly significant) heating of the transformer.

You may or may not magnetise the core, it depends on the material it is made up of.

davenn

Moderator
Sep 5, 2009
14,315
hi Asj

welcome to the forums

if you notice this is the introductions section of the forum
have a look in the main https://www.electronicspoint.com/ part of the forums and see which section would be the most suitable area to post you question in.
Its more likely to get an answer than when posted in here

cheers
Dave

Harald Kapp

Moderator
Moderator
Nov 17, 2011
13,828
Hello Asj,
pulsating DC can be thoought of as DC with overlaid AC. Since the transformer is unable to transfer the DC part of the signal from its primary coil to the secondary, the DC part will only heat the transformer.
You could block the DC by adding a series capacitor to the primary coil. Thus only the AC component of the signal is seen by the transformer. The size of the capacitor depends on factors like frequency of the signal, inductance of the transformer coil, power to be transmitted etc.

Regards,
Harald

Asj

Jan 23, 2012
10
Transformer

what will happen if i apply Dc pulse to secondary shorted transformer ? What width will be safe ? Wiil transformer go into saturation?

Resqueline

Jul 31, 2009
2,848
It depends on the transformer and the resistances and leakage inductances involved.
It'll saturate as fast as the leakage inductance and resistance will allow it to.
We're talking µ-seconds for a ferrite transformer.
Use a fast current sensing circuit to stop.

Asj

Jan 23, 2012
10
If i Apply Dc pulse to secondary shorted transformer how will the current waveform look like ? And since i am removing voltage iimediately so the Energy that is there in Inductor need to be taken care off.How this can be done?

Last edited:

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
Asj, I've combined these three threads because they're all substantially about the same thing.

Asj

Jan 23, 2012
10
When Dc pulse is applied at rising edge of Pulse the current will start flowing in primary of winding then after certain time secondary of transformer will come in parallel to primary and current will shoot up , but will come down at negative edge of pulse , and current will flow only in primary .

G
Replies
2
Views
1K
R.Legg
R
Replies
5
Views
130
Replies
8
Views
174
Replies
13
Views
200
Replies
4
Views
309