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In Reply to: RE: PSUD2 how to input a CLCLC filter? posted by DAK on January 31, 2017 at 19:01:43
Place your mouse pointer on Load to highlight it, right click and select insert, then insert C filter. Place mouse pointer on Load and right click again and insert, then insert RC filter. Repeat for more stages.
Edits: 01/31/17Follow Ups:
The rectifier IFRM OF .75A has been exceeded with a value of.9a
lower the value of the first C
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
.
It is also a good idea to include a bleeder resistor in the "Load" position of the power supply to drain the capacitors for safety reasons when you build a power supply. With a bleeder resistor in place, any energy stored in the capacitors will discharge when the power is turned off, so that the capacitors cannot accidentally shock or even kill you, depending on the voltage and charge.
The bleeder resistor will add to the power supply current draw so the bleeder resistor current needs to be added to your circuit current requirement in order to properly model your power supply.
Use a resistor as a load or change it to a constant current load.
To change the resistive load place your mouse over the resistor and right click then left click on edit.
To change the load to a constant current one, place the mouse over where it says load and right click and click change.
Example,
If you have a 400vdc supply and your circuit draws 100ma. then voltage divided by current = 4000 ohms
Or just set the constant current load at 100ma.
BTW The program does come with a Help file. You could just look this up for yourself.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
.
Just click OK, click on I(D1) and then zoom in (left click on the wave form and drag) and look to see if the peak repetitive current is being exceeded every time or if was just on start up.I posted the following info on the other thread,
It's not the value of the first cap per se.
It's the value of the repetitive peak charging current that happens at twice the line frequency.
The more resistance in the secondary the more capacitance you can get away with.
If you use a low DCR power transformer then you will be forced to use a low value first cap.
If you use a critical value input choke then you can use as big of a cap after the choke as you want.
BTW All of this information is on the datasheets. When the datasheet shows 4uf (or whatever) that assumes the required DCR is present in the secondary of the power transformer. If there is less than the required DCR then you can get into trouble with less than the stated 4uf (or whatever).
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 02/01/17
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