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+/- 30 kV(60 kV) LAB HV powersupply with custom flyback transformers, variable

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Patrick
Sun Apr 03 2016, 05:12PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		can we get a peek at the voltage feed back schematic ?
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Erlend^SE
Sun Apr 03 2016, 05:57PM
Erlend^SE Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
 		Sure,
but it's basically a internal 300 MOhm resistor, combined with a 2 kohm external resistor to ground(or other known voltage).

The resistor circuit converts 0-30 kV into 0-2V, that can then be meassured by a microcontroller.

I can PM you the schematic (or even design files) if you want, but the circuit for the whole board is somewhat big).

be warned: If you are not used to op-amps, the op-amp signal buffers is likely to confuse you.
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Patrick
Sun Apr 03 2016, 08:42PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		ok a simple voltage divider with op-amp. so do you have a capacitor on the HV side ?
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Erlend^SE
Sun Apr 03 2016, 08:47PM
Erlend^SE Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
Patrick wrote ...

ok a simple voltage divider with op-amp. so do you have a capacitor on the HV side ?

Well.. both yes & no

There is no HV capacitor in the transformer itself, but the output cable is shielded with grounded shield.
And it's unavoidable that the cable will work as output capacitor, so I plan to use it to my advantage. Cutting the cable down in length is out of question!

The op-amp is just voltage follower, it should have zero effect on the divider itself, but gives the signal to the rest of the board (microcontroller) lower impedance.

My transformers are made for 12/24V bridge, but most other transformers are designed to run in flyback from something in the 70-150V range, with a 1000V-1500V transistor.
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Proud Mary
Mon May 30 2016, 07:17PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		Many designers tasked to produce a 30 kV@10mA supply would choose to have the 30 kV tripled up from a 10 kV secondary, and I wondered why you had chosen not to do this.
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Erlend^SE
Mon May 30 2016, 08:43PM
Erlend^SE Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
Proud Mary wrote ...

Many designers tasked to produce a 30 kV@10mA supply would choose to have the 30 kV tripled up from a 10 kV secondary, and I wondered why you had chosen not to do this.

Mostly since I don't want a circuit with all those capacitors.

Also, it would take quite some isolation, and that can be messy.

I just want a tiny power-supply module, that is very controllable.
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