Simplistic Mosfet HV Shunt Regs - Page 170

Salas · 29th March 2011, 01:08 PM

Quote:

Originally Posted by albertli

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.

dvb-projekt · 29th March 2011, 02:06 PM

Hi Salas,

could you short explain what´s the benefit of the lower R3 value?

albertli · 29th March 2011, 02:51 PM

Quote:

Originally Posted by Salas

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

Salas · 29th March 2011, 03:03 PM

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.

albertli · 30th March 2011, 01:52 AM

Quote:

Originally Posted by Salas

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

Salas · 30th March 2011, 02:07 AM

OK.

dvb-projekt · 30th March 2011, 05:06 AM

Quote:

Originally Posted by dvb-projekt

Hi Salas,

could you short explain what´s the benefit of the lower R3 value?

bump

Salas · 30th March 2011, 05:47 AM

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.

manamanam · 31st March 2011, 07:13 AM

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?

quanghao · 31st March 2011, 07:14 AM

Quote:

Originally Posted by manamanam

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!

29th March 2011, 02:06 PM	#1692
dvb-projekt diyAudio Member Join Date: Feb 2009 Location: Willich, Germany Blog Entries: 31	Hi Salas, could you short explain what´s the benefit of the lower R3 value? __________________ Reference TDA1541A DAC project PCB´s / Tube-I-zator PCB / SSHV-Shunt PCB Stock status in my Blog

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29th March 2011, 03:03 PM	#1694
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

30th March 2011, 02:07 AM	#1696
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	OK.

30th March 2011, 05:47 AM	#1698
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.