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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 21st July 2019, 06:26 PM   #1611
polaron is offline polaron  France
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Salas View Post
Measure Vgs on M1 & M2 plus Vbe on the BC transistors. Let me know the figures. To make sure none of those semis went bad during the stress.

Not beautiful!



M2 - 1V/5V
M1 - 0,1/5,9V
Q1 - 0,56/5,7V
Q2 - 0/0,6V
Q3 - 0,6/0,3V
Q4 - 3,3 - 0,5V


All must be changed, right?
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Old 21st July 2019, 07:28 PM   #1612
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Healthy M1 or M2 must generally have 3-6V Vgs, exact number depends on how much current runs through.

Healthy BC transistors must have 0.5-0.7V Vbe, again depends on how much current runs through.

All showing otherwise change.
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Old 21st July 2019, 07:45 PM   #1613
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Vgs is measured between Mosfet pins 1-3

Vbe is measured between pins 2 and 3 in BC transistors

Bridge diodes may show around 1V forward voltage drop between each one's pins. If they are running high current they may demand sinking. Especially when supplying a capacitor that is continually being replenished for delivery to a constant current load.
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Old 21st July 2019, 08:46 PM   #1614
polaron is offline polaron  France
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Salas SSLV1.3 UltraBiB shunt regulator
Fine!!!


M2, 3,95V ; M1, 5,73v ; Q1 and Q4, 0,56 ; Q2V and Q3, 6,2V !!!
Bridge diodes are a litle warm, completely normal.
Shunt is outputting 5volts.
The heatsink is warm.


Seams that everything is ok.
This was one more lesson for me.

Now, testing the other 2 remaining shnts, neg and pos. With 9volts secondaries!!!
Next post. Tomorrow, because I have to drill in the heatsinks and cut them.
Thanks again Salas.
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Old 21st July 2019, 09:01 PM   #1615
polaron is offline polaron  France
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Salas SSLV1.3 UltraBiB shunt regulator
The remaining shunts are tuned to draw 200mA.
This is more than three time less than the one that is tuned to 700mA. Voltage is the same.

This one has a big heatsink and it gets just warm, may be 30 degrees, acceptable.



I am sure that this calculations are not completely "linear", I mean not necessarily 100% proporcional, many values are not accurate, etc, but one half of this heatsink must be enough for each one of those two shunts drawing 200mA.


I would cut the identical heatsink in two, for those two shunts drawing 200mA.
Hope I'm being clear...but never mind, I will try it and put my fingers on it!
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Old 22nd July 2019, 01:50 AM   #1616
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Q2 Q3 Vbe much high or wrong types. Change them.
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Old 22nd July 2019, 07:38 AM   #1617
pistollero is offline pistollero  Portugal
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Is 24vac transformer ok for using Ubib to output 26vdc?
Tks
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Old 22nd July 2019, 07:55 AM   #1618
polaron is offline polaron  France
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Salas SSLV1.3 UltraBiB shunt regulator
pistollero,



I made a Ubib for 24vac, I use 18vac. It works perfectly.
It does not mean that 21 or 24 doesn't work...
Salas will give you the final answer.
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Old 22nd July 2019, 08:08 AM   #1619
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
The M1 CCS works with low voltage margin also, but not optimally. Proper choice for 24VDC output is 22VAC transformer. Next, for 26VDC output, a 24VAC transformer is good choice. Calculate as described in the guide:

"Transformers
You should choose enough secondary voltage for the rectified DC across C1 (Vin) to reach 5V higher (or more) than your Vout setting. Rectified DC=(VAC*1.414)-1.4V diodes drop. Use 9VAC for 5-7Vout, 12VAC for 8-10Vout, 15VAC for 11-15Vout, 18VAC for 16-19Vout and so on and so forth up to 33VAC max secondary not to burn a JFET. The reg works even with less than 5V difference because CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's parasitic capacitance."
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Old 22nd July 2019, 08:43 AM   #1620
pistollero is offline pistollero  Portugal
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Quote:
Originally Posted by Salas View Post
The M1 CCS works with low voltage margin also, but not optimally. Proper choice for 24VDC output is 22VAC transformer. Next, for 26VDC output, a 24VAC transformer is good choice. Calculate as described in the guide:

"Transformers
You should choose enough secondary voltage for the rectified DC across C1 (Vin) to reach 5V higher (or more) than your Vout setting. Rectified DC=(VAC*1.414)-1.4V diodes drop. Use 9VAC for 5-7Vout, 12VAC for 8-10Vout, 15VAC for 11-15Vout, 18VAC for 16-19Vout and so on and so forth up to 33VAC max secondary not to burn a JFET. The reg works even with less than 5V difference because CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's parasitic capacitance."
Thank you very much Salas.
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