Simple High Voltage Regulator

[FaustoP]

Thank you very much Tibi

 

[iTiberius]

I had to wait few months for DN2540 to arrive and today finished to test this regulator. Is rock stable and ultra low noise. More measurements will come, but is very promising.


Regards,
Tibi

 

[iTiberius]

Test setup:
- input 240Vac
- output 170Vdc
- output load 5 x 560ohm = 2k8
- current limited at 60mA trough R7 = 10ohm

Results:
- under full load output dropped to 168,8Vdc
- noise 272uVpp
- mosfet reached 75C with a very small heatsink
- load reached over 98C

Regards,
Tibi

 

[iTiberius]

Just observed that just bringing my phone close to the scope this add a lot of noise spikes.
Here is output noise without any load ~0.8mVpp

Regards,
Tibi

 

[iTiberius]

My scope have around ~100uVpp noise with input grounded, so my measurements are polluted by this.

Regards,
Tibi

 

[jackinnj]

Without feedback, it's a high impedance design. AC Sweep with DC current of 25mA (R7 is adjusted to 1uOhm)

 

[iTiberius]

OK 😀
I forgot to mention that the schematic tested is this one Simple High Voltage Regulator

Latest KiCad files are at post 20 - > Simple High Voltage Regulator

Regards,
Tibi

 

[diyiggy]

@tvicol,
Hi, thank you for your SHVR. Minimal size and parts number and very usefull. I like a lot also the picture on the transparent plastic bag...sorta of made it quiet a la Dexter 🙂
I have please some question as a noob. What is please the trimpot model and value you used ? I would like to drop 10V from 300 V input after rectification.
220k was elevated with the wire for cooling purpose ?

 

[v4lve lover]

I have designed a more complex but similar regulator using the TL431 chip, it works great.

 

[jan.didden]

Nice circuit. Did you get around to doing any measurements, like Zout, noise?

Jan

 

[v4lve lover]

I still have one partly assembled boards if you want to have the honours.

Sim was very good, but my licence for multisim has expired.

Attached Gerbers and Schematic

 

[iTiberius]

@tvicol,
Hi, thank you for your SHVR. Minimal size and parts number and very usefull. I like a lot also the picture on the transparent plastic bag...sorta of made it quiet a la Dexter 🙂
I have please some question as a noob. What is please the trimpot model and value you used ? I would like to drop 10V from 300 V input after rectification.
220k was elevated with the wire for cooling purpose ?

Thank you !

For test I have used a potentiometer available in my lab.
220K resistors are elevated because I was playing with different values.

I have redesigned the boards to include a discrete e-choke.
And for this project, I have a newly designed Saligny HVHF MKIII made on a 4 layer pcb.
New SHVR boards arrived and this regulator will be added to His masters noise phono.
I'll add more pictures and source/gerber files in the next days.

Regards,
Tibi

 

[diyiggy]

Thanks Tibi for the answer,
What is the pot value advised please ?

 

[iTiberius]

As in schematic, 5k.

Regards,
Tibi

 

[diyiggy]

Many thanks Tibi 🙂

 

[iTiberius]

New boards, new tests. This time with synchronous rectifier, noise is under 300uV at 330Vdc out, no load.
Next thing is to include gyrator (e-choke) and make more measurements.



Regards,
Tibi

 

[esl 63]

Amazing! 300uV is quite sufficient.. no need to overkill 🙂

 

[cyclones]

Hi! maximum current that will flow in the circuit (at 180V) ?

 

[iTiberius]

Considering 180Vdc output and 200Vdc after rectifier, you may go for 500mA.
For this R7=12ohm and Q3 will dissipate 10W. A large heatsink will be needed.

Regards,
Tibi

 

[cyclones]

How to calculate current ? formula plz !
for example output 180V DC / 180mA
Thank you!