Hello,
In Vietnam now with no psud on my android tablet.
Trying to help another member with making a choke input supply.
To keep it simple.
One secondary winding, 4 sbyv28-200 diodes forming a bridge rectifier, 20 Henry choke with 60 ohm dcr and a 2200 microfarad cap after that another lc network.
Right now we dont know the exact current being drawn by the circuit. I expect there is a cap, taking some extra current after being used long time to close to its maximum voltage.
We will need around 36 volt dc on the 2200 cap when current drawn is around 75 mA.
We will need around 37,5 volt on the same cap with 150 mA
Normally i enter a little higher ac in the software than the datasheet.
So for 44 volt 260 mA i will enter 47 volt and for 40 volt 300mA i will enter 43 volt.
Can someone run a few simulations with 75 and 150 mA load to check if the transformers i mention give about the right voltage on the first cap.
Thanks in advance, Eduard
In Vietnam now with no psud on my android tablet.
Trying to help another member with making a choke input supply.
To keep it simple.
One secondary winding, 4 sbyv28-200 diodes forming a bridge rectifier, 20 Henry choke with 60 ohm dcr and a 2200 microfarad cap after that another lc network.
Right now we dont know the exact current being drawn by the circuit. I expect there is a cap, taking some extra current after being used long time to close to its maximum voltage.
We will need around 36 volt dc on the 2200 cap when current drawn is around 75 mA.
We will need around 37,5 volt on the same cap with 150 mA
Normally i enter a little higher ac in the software than the datasheet.
So for 44 volt 260 mA i will enter 47 volt and for 40 volt 300mA i will enter 43 volt.
Can someone run a few simulations with 75 and 150 mA load to check if the transformers i mention give about the right voltage on the first cap.
Thanks in advance, Eduard
Hello,
I think about Hammond 229b88 with secundairies in parallel to get 44 volts 260 mA or 229b40 with secondairies in series to create 40 volts 300mA
I know you have to enter the unloaded value. And my friend live with 220 volts so voltage will be a little lower
I expect to need something close to these two to end up with the dc voltages in mentioned in my post.
Thanks in advance.
Greetings,Eduard
I think about Hammond 229b88 with secundairies in parallel to get 44 volts 260 mA or 229b40 with secondairies in series to create 40 volts 300mA
I know you have to enter the unloaded value. And my friend live with 220 volts so voltage will be a little lower
I expect to need something close to these two to end up with the dc voltages in mentioned in my post.
Thanks in advance.
Greetings,Eduard
Hello,
T1 will be 42 or 46 volt and something like 2 ohm
There is no comparable low voltage drop diode in the list?
L2 and C2 are not needed for simulation because they can be calculated and it will be a different choke anyway
Current tap will be 75 or 150 mA
Like i wrote with 75mA current we need around 36 on the cap
With 150 mA it should be around 37,5 .
It could well be that with that extra we will need the 44 volt model for sure.
If there is no low drop diode to be chosing we can just add a total of 2 volts dc?
Greetings,Eduard and thanks again
T1 will be 42 or 46 volt and something like 2 ohm
There is no comparable low voltage drop diode in the list?
L2 and C2 are not needed for simulation because they can be calculated and it will be a different choke anyway
Current tap will be 75 or 150 mA
Like i wrote with 75mA current we need around 36 on the cap
With 150 mA it should be around 37,5 .
It could well be that with that extra we will need the 44 volt model for sure.
If there is no low drop diode to be chosing we can just add a total of 2 volts dc?
Greetings,Eduard and thanks again
Hello
Thank you very much .
So probably it would be more sensible to go for a 48 volt transformer. OR get to know the exact running taken by the circuit.
I can't read the data from the last graphic on my phone very good but going to low voltage drop we could win around 1,5 volts dc extra on the first cap.
Greetings, Eduard
Thank you very much .
So probably it would be more sensible to go for a 48 volt transformer. OR get to know the exact running taken by the circuit.
I can't read the data from the last graphic on my phone very good but going to low voltage drop we could win around 1,5 volts dc extra on the first cap.
Greetings, Eduard