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High Voltage Bench Power Supply Design
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001:
It is pitfall
Common power MOSFET is actually a bunch of many small devices in parallel
Any small transistor can be overloaded
So local damage is highly expected
BravoV:
Not sure if this fits you, 0-500V at 10ma -> EDN : Regulate a 0 to 500V, 10-mA power supply in a different way

I guess you need to modify to accommodate higher current.


H713:
Again, I'm hoping that by paralleling multiple devices I can cut down on the chances of the pass elements failing. I'm well within the DC SOA for the devices mentioned in earlier posts, and so long as I can work out a decent current limiting function the pass elements should never be subjected to the stresses that would cause them to fail. At the present time, I'm extremely busy and haven't had a lot of time to sit down and design a current limit circuit- the negative feedback loop in my current project (a push-pull 1625 power amplifier with a solid-state phase splitter) is taking longer than I anticipated to fine-tune, so this project has been pushed back a little. That is combined with the rather heavy workload that engineering majors are subjected to.

Also remember, as I mentioned, I will be cooling these devices VERY well, so it's not like they're going to be running at 60C or anything like that.

Lastly, I have no illusions that this is better than doing it with tubes. This is an application where tubes excel, but in my situation space limitations come into play.

The reason I want this to be a regulated supply, rather than just a transformer with a variac on the primary is that I sometimes use the bench supply when I want to take the power supply ripple and voltage sag out of the equation.

Wolfgang:

--- Quote from: BravoV on January 28, 2019, 09:04:32 am ---Not sure if this fits you, 0-500V at 10ma -> EDN : Regulate a 0 to 500V, 10-mA power supply in a different way

I guess you need to modify to accommodate higher current.



--- End quote ---

Hi,

I have build this but as expected it is very slow. You could speed this up by replacing the photcell coupler by a small transformer-based supply plus a normal optocoupler. This can also drive more current then. Furthermore, the BU208A could be replaced by a linear MOSFET, now available up to 2.5kV.
BravoV:

--- Quote from: Wolfgang on February 06, 2019, 09:36:56 am ---Hi,

I have build this but as expected it is very slow. You could speed this up by replacing the photcell coupler by a small transformer-based supply plus a normal optocoupler. This can also drive more current then. Furthermore, the BU208A could be replaced by a linear MOSFET, now available up to 2.5kV.

--- End quote ---

Mind share your circuit in schematic, as I have difficulty to visualize it.

Btw, you said very slow, do you mean the regulation ? How slow ?
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