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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 29th March 2011, 01:08 PM   #1691
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Quote:
Originally Posted by albertli View Post
Sorry, the attachment didn't go with it.
Basically I follow the new version with some changes. R1-56R, R3/56K and R5-100k. I go with CLC and split into 2 RC 180v to the regs. I'm aiming at 150v 9 mA.

Albert
They have used it before on #26 in its thread with good feedback commentary. Make R3 33K 5W for 180V input. Measure 3x1.9Vf Leds @ 5mA so the 56R will give around 40mA for average Vgs. At this input voltage skip the big protection Zener, use only the small ones at the gates if any. Good luck and let us know.
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Old 29th March 2011, 02:06 PM   #1692
dvb projekt is offline dvb projekt  Germany
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Simplistic Mosfet HV Shunt Regs
Hi Salas,

could you short explain whats the benefit of the lower R3 value?
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Old 29th March 2011, 02:51 PM   #1693
albertli is offline albertli  Canada
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Quote:
Originally Posted by Salas View Post
They have used it before on #26 in its thread with good feedback commentary. Make R3 33K 5W for 180V input. Measure 3x1.9Vf Leds @ 5mA so the 56R will give around 40mA for average Vgs. At this input voltage skip the big protection Zener, use only the small ones at the gates if any. Good luck and let us know.
Salas,
Thanks for your response.
What if I use a isolation transformer then I might have 170v input, the R3 33K stays the same? Use small zeners at the gates, I thought you suggest the D1 1n5383B can be smaller and the D5,6,7and 8 remain the same 1n4742a. Can I use same 90v for D1 or ??
Albert
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Old 29th March 2011, 03:03 PM   #1694
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
33K stays the same with 170V DCin. Small 0.5W 10V-12V types Zeners will all do for gates protection. IRF9610 is a 200V part so you can be secure without D1 even with your voltages.
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Old 30th March 2011, 01:52 AM   #1695
albertli is offline albertli  Canada
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Quote:
Originally Posted by Salas View Post
33K stays the same with 170V DCin. Small 0.5W 10V-12V types Zeners will all do for gates protection. IRF9610 is a 200V part so you can be secure without D1 even with your voltages.
Salas,
Thanks.
So I only need 4 12v for the purpose.
Will let you know but might take a while, for I just start ordering parts.
Albert
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Old 30th March 2011, 02:07 AM   #1696
Salas is offline Salas  Greece
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OK.
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Old 30th March 2011, 05:06 AM   #1697
dvb projekt is offline dvb projekt  Germany
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Simplistic Mosfet HV Shunt Regs
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Originally Posted by dvb-projekt View Post
Hi Salas,

could you short explain whats the benefit of the lower R3 value?
bump
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Old 30th March 2011, 05:47 AM   #1698
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
That value gets to be adjusted for feeding the Leds healthier like in average 200-300V SSHV if some builds are lower or higher DCin.
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Old 31st March 2011, 07:13 AM   #1699
manamanam is offline manamanam  Greece
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Hi,

I 'm getting ready to move to simpler simplistic version of Salas HV shunt.
300Vin, 260Vout. If i want to aim for 60mA, is there any other change except lowering R1?
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Old 31st March 2011, 07:14 AM   #1700
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by manamanam View Post
Hi,

I 'm getting ready to move to simpler simplistic version of Salas HV shunt.
300Vin, 260Vout. If i want to aim for 60mA, is there any other change except lowering R1?
R1 =33R, you can get 60ma!
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