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Jan's HV regulator
Jan's HV regulator
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Old 17th October 2019, 11:03 PM   #11
chede is offline chede  Germany
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Jan's HV regulator
Trying to understand as well. And I don‘t get circuit diagram and picture from #43 completely together yet ...
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Old 18th October 2019, 07:22 AM   #12
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by gerrittube View Post
Jan,

I’m trying to understand the hv regulator circuit. It’s impressive and I would like to build one, if I can find the right components. Do you have any thoughts on a PCB?

Regards, Gerrit
I have some PCBs available, as well as some of the HV parts.
On the 3D view you see three TO220 devices, but you would use only two in an actual circuit. But there are two possible positions for the pass device, either on the on-board heatsink for disspations up to 6 or 7 watts, or on the edge of the board for mounting on a chassis or larger heatsink. There is a note to that on the schematic.

Jan
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Last edited by jan.didden; 18th October 2019 at 07:27 AM.
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Old 18th October 2019, 07:30 AM   #13
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by chede View Post
Trying to understand as well. And I don‘t get circuit diagram and picture from #43 completely together yet ...
The error amplifier, the AD8031, drives the gate of the pass device.
That opamp gets two inputs. One is the output voltage, on the inv input. The other is the reference voltage, on the non-inv input. The difference between them drives the gate up or down.

Jan
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Old 18th October 2019, 08:00 PM   #14
gerrittube is offline gerrittube
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Hi Jan,

I’m interested in a PCB + some essential parts (Conrad for the rest?).
What can you offer?

Regards, Gerrit
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Old 18th October 2019, 08:06 PM   #15
chede is offline chede  Germany
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Jan's HV regulator
Hmmm ...
Reference voltage is provided by U1, the LT3092 ?
And the circuitry around Q8 steps down the difference between Vin and Vout to a safe voltage range for the op-amp ?

So I guess the regulator doesn‘t limit Vraw from climbing up too high when there‘s no load yet (tubes not fully heated up / bias servo still at too negative grid voltage). I have a PSU that‘s cLCC (or LCC), and without load the voltage keeps climbing. For this, I probably would combine the regulator with your HV delay circuit, right?

Regards, Claas
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Old 18th October 2019, 08:10 PM   #16
jan.didden is offline jan.didden  Europe
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The PCB I have, and the ref current source LM3092 (I can put that on the board if you are uncomfortable with SMD), the HV depletion mode IXTP08N100D2, the AD8031, the pass MOSFET FDP12N60NZ.
Let's say € 30 plus shipping.

R11 has to be selected depending on the necessary Vout at about 0.58V per kOhm. So for instance, for 250V, R11 should be ~430k. You can adjust the Vout +/-20% with VR1. Note that R11 must be selected for the full output voltage. Conrad or Mouser should have it.

I might also have a few of the HV film caps, C3, C4 and C6 but I need to check. I think they are about € 2,00 each.

Jan
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Old 18th October 2019, 08:17 PM   #17
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by chede View Post
Hmmm ...
Reference voltage is provided by U1, the LT3092 ?
And the circuitry around Q8 steps down the difference between Vin and Vout to a safe voltage range for the op-amp ?

So I guess the regulator doesn‘t limit Vraw from climbing up too high when there‘s no load yet (tubes not fully heated up / bias servo still at too negative grid voltage). I have a PSU that‘s cLCC (or LCC), and without load the voltage keeps climbing. For this, I probably would combine the regulator with your HV delay circuit, right?

Regards, Claas
The LT3092 is configured as a current source, about 580uA, and develops the reference voltage across R11.

A main feature is that the whole regulator circuit floats on Vout so there's no issue with dividing down high voltage. Also, it means that the loop gain is always the same no matter the Vout, so it is stable for any Vout.

Q8 etc steals some current from Vin to develop a small supply voltage for the opamp and the LT3092. By using a very low supply current opamp (typ 800uA) and a high brightness LED in series with the LT3092, the whole reg circuit runs at just a few mA.

That also means however that you must have a load that takes at least 3mA or so, you should not run it open load. But anything you hang off it will surely take more than 3mA.

Jan
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Old 18th October 2019, 08:23 PM   #18
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Hi Jan,

I would like to buy a PCB. I’m not familiar with SMD soldering, my Weller soldering station dates from before SMD. So if you could put it on the board that would be great. I’ll take the other parts from you as well, if possible, as far as you have them available. I see that the IXTP08N100D2 is not available from Conrad.

How can I make the payment to you? If necessary you can mail me at info AT winvis DOT nl.

Regards, Gerrit
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Old 18th October 2019, 08:47 PM   #19
jan.didden is offline jan.didden  Europe
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Quote:
Originally Posted by gerrittube View Post
Hi Jan,

I would like to buy a PCB. I’m not familiar with SMD soldering, my Weller soldering station dates from before SMD. So if you could put it on the board that would be great. I’ll take the other parts from you as well, if possible, as far as you have them available. I see that the IXTP08N100D2 is not available from Conrad.

How can I make the payment to you? If necessary you can mail me at info AT winvis DOT nl.

Regards, Gerrit
YGM.

I think I got the entire stock of the IXPT08N100D2 from Mouser a few months ago. ;-)

Jan
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Old 18th October 2019, 09:04 PM   #20
chede is offline chede  Germany
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Jan's HV regulator
I‘d like a board as well. Thank you very much for offering, and I would like to go with your offer of PCB and parts as spelled out in the first paragraph of #16.

My soldering station is simple as well, but I tried SMD soldering with the tiny JFETs for the BAF2018 line stage, and didn’t find it too bad. It actually was easier than expected. So I‘ll try this one, too

Would you contact me via PM for PayPal instructions or similar ?

Thanks in advance, best regards, Claas
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