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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 24th July 2012, 10:17 AM   #3101
RollE2k is offline RollE2k  Sweden
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Thanks for the fast answer! Will probably try this later on if i cant find a better placement for the PCB.
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Old 24th July 2012, 10:23 AM   #3102
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Make sure you got spare semis, since this is beyond prototypes team tested territory, and that extension cabling is inductive in a sensitive place.
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Old 24th July 2012, 01:57 PM   #3103
studiostevus is offline studiostevus  Netherlands
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Quote:
Originally Posted by studiostevus View Post
You are probably right, but usually PSUD2 is quite spot-on:

I am using a transformer from a reputable source in Germany, multiple members have used it before without problems.

The chokes are specified by the same source as 330Ohm. I have modeled this correctly in PSUD2.

I did some further calculation, and think I could live with 170V input voltage (then I could have 150V output voltage which would work in my application). However I still don't understand this extreme sagging...
Theoretically, if I would have been satisfied with a -say- 10mA@100V supply. I would be looking for 30mA CCS and 100V output voltage. Even that is not achievable now.... I can't get my CCS above 13mA...
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Old 24th July 2012, 03:11 PM   #3104
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
You got to debug then. Maybe your CCS is in oscillation in your layout version, maybe some semi is out. Use the scope in main nodes, look for Vgs, Vbe, to be healthy etc. Give the reg a feed from first cap of raw supply to see if something changes.
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Old 25th July 2012, 07:16 PM   #3105
Tfan69 is offline Tfan69  Italy
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Hello,
Did a little mistake when ordering part and bought dn2540 to92, so very little current flow... i have some dn2535 to220 on hand, can i use these? Vin is 280v...
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Old 25th July 2012, 09:51 PM   #3106
massimo is offline massimo  Italy
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How many T092 did you bought? Where are you located? We can exchange some if you don't need them...
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Old 26th July 2012, 01:17 AM   #3107
Tfan69 is offline Tfan69  Italy
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Hi Massimo, check your pm 's
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Old 27th July 2012, 10:48 AM   #3108
Tfan69 is offline Tfan69  Italy
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Massimo your pm folder is full, i cannot reply to your msg...
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Old 28th July 2012, 12:32 PM   #3109
kacernator is offline kacernator  Czech Republic
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Default Thermal Vout drift

Hi,

I have running SSHV1, cascoded version. Between cold startup and warmed up run, I have 30V of difference. I am using 2SK170GR. Can I do something to make the output voltage not to drift with temperature?

Thanks.
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File Type: png SSHV Regulator.png (10.1 KB, 327 views)
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Old 28th July 2012, 12:37 PM   #3110
merlin el mago is offline merlin el mago
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Measure the real resistance in the trimmer and substitute for a low ppm fixed resistor.
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