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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 24th June 2018, 06:54 PM   #5871
poty is offline poty  Russian Federation
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Quote:
Originally Posted by anystereo View Post
I would do the PSUD2, but i don't know the open load numbers for either of these and I will end up with wishful thinking.
PSUD allows to enter the ohmic resistances of windings to count the open load numbers. The resistances can be measured or obtained from manufacturers' web sites (Hammond has them definitely).
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Old 13th July 2018, 06:54 PM   #5872
Tfan69 is offline Tfan69  Italy
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HI! possibly this has been answered dozens of times.. so forgive me but this thread is gigantic!
A ready available 2sk117 alternative from common industrial suppliers like farnell, digikey etc?
Thanks
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Old 13th July 2018, 08:13 PM   #5873
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
2SK880GRTE85LF

Its SMD you need a SOT-23 adapter mini board to make it through hole
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Old 15th July 2018, 10:51 AM   #5874
Tfan69 is offline Tfan69  Italy
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thanks!
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Old 20th July 2018, 11:58 AM   #5875
savu is offline savu  Ireland
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Hi Salas,

I have designed a PCB and built SSHV2 and I have a problem with it. I can't properly change the output voltage from R11 due to D3.
If I eliminate D3, everything is all good.
I have read as much as this this thread as my time allows and I found out about the schottky MBR1100.
I don't have this on hand... can I use any schottky rated at 100Vdc minimum and 2A?

Attached some pictures of my build.

Best regards,
Silviu
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Old 21st July 2018, 04:27 PM   #5876
poty is offline poty  Russian Federation
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Have you checked the D3? Have you solder it in the right direction (anode-cathode)?
You can use any power diode here. I'd use 5A or more though.
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Old 23rd July 2018, 11:44 AM   #5877
savu is offline savu  Ireland
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Hi Poty,

I placed a schottky rated at 100Vdc, 2A. I did not get a chance to check it. Hope it's ok... thanks for the advice
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Old 23rd July 2018, 03:41 PM   #5878
jaz_12 is offline jaz_12  Poland
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Hi all :-)

first of all very thank you all for this project and all helpful information. I just finished my pcb version of Salas. IRF 450 instead of 840. Everything works fine, but I have few questions:

Vin 304.96VDC
Vout on dummy load 207,3VDC (stable after just few minutes); my target
Rdummy 11,47k Idummy 18,07mA
Vacross 10,26ohm 0,2252V --> I 22,5mA
Vgs IRF450 3,09V

Nothing is hot, first DN2540 has normal temperature (warm), IRF450 TO-3 case with typical heat sink little bit warm.

Is 98V not too big? Should I drop more volts on filter section?
IRF450 was used. Wrong choice?
You said 20mA own cosumption, here much more less or I cannot make proper calculation.

Any suggestion?
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Old 23rd July 2018, 04:07 PM   #5879
poty is offline poty  Russian Federation
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You should increase the current through DN2540 definitely.
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Old 23rd July 2018, 05:46 PM   #5880
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by jaz_12 View Post

Is 98V not too big? Should I drop more volts on filter section?
IRF450 was used. Wrong choice?
You said 20mA own cosumption, here much more less or I cannot make proper calculation.

Any suggestion?
Regarding 98V drop across reg you may use less after you will up the CCS current if the DN MOSFET will become too hot. Depends on sinking.
It looks like you have good sinking for the DN but little for the 450.
IRF450 is slower (more pF) but robust and if stable not too bad for a substitute.
Calculation is easy. I_load+I_own=Set CCS. Although the reg can work to very few own mA, at about own 20mA it shows good output impedance. The more own (shunt) mA the better performance but will also warm up both MOSFETS more. You must make a practical decision.
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