300 V DC Power Supply

[Sinewave]

Has anyone got any ideas or circuits for a 300 volt DC power supply?

I've got a few ideas buzzing around my head about using the peak value of the mains voltage (240v) and rectifying it, possibly using a 1:1 transformer for isolation.

Any ideas/diagrams from any known working similar projects would be welcome.

 

[(*steve*)]

The safest way is to use a small boost converter.

What are you using the 300v for? How much current is required?

 

[kellys_eye]

Regulated?

 

[Minder]

UK 230 gives you ~320VDC, you could regulate or if not needed, use a buck-boost transformer to drop the 20v.
Or if using a toroidal Txfmr easy to take a few turns off.
M.

 

[kellys_eye]

I have the schematic of a DC-DC boost converter that connects to your bog-standard lab PSU and allows the variation of 0-30V from the lab supply to become 0-300V for 'other purposes'.

This facility allows you to use the over-current protection of the lab supply for safety purposes.

 

[Sinewave]

UK 230 gives you ~320VDC, you could regulate or if not needed, use a buck-boost transformer to drop the 20v.
Or if using a toroidal Txfmr easy to take a few turns off.
M.

That's along the lines I was thinking...

 

[Sinewave]

I have the schematic of a DC-DC boost converter that connects to your bog-standard lab PSU and allows the variation of 0-30V from the lab supply to become 0-300V for 'other purposes'.

This facility allows you to use the over-current protection of the lab supply for safety purposes.

That would be most welcome if I could get a copy from you please?

 

[Terry01]

What sort of things would you use 300V for in hobby stuff or is that amount of V for other things?

 

[kellys_eye]

That would be most welcome if I could get a copy from you please?

 

[Minder]

A suitable design would be based on whether you want regulation or not?
M.

 

[Sinewave]

Thanks. That looks interesting. Is that transformer a one off or does it need to be specially made? Have you built one of these?

 

[Sinewave]

A suitable design would be based on whether you want regulation or not?
M.

Doesn't need to be, but a bonus if it is.

 

[Minder]

Then it is optional, depends how much effort you want to put into it.
What is the application it is needed for?
M.

 

[Sinewave]

Then it is optional, depends how much effort you want to put into it.
What is the application it is needed for?
M.

It's for bench/lab work.

 

[kellys_eye]

Is that transformer a one off or does it need to be specially made?

Read the article - the transformer is hand wound but not many turns so easily made and the core can be 'practically' any ferrite material.

 

[Jeff Leites]

Check out the power supply sections of the guitar amp projects at ax84.com

 

[Engineer_Paul]

Has anyone got any ideas or circuits for a 300 volt DC power supply?

I've got a few ideas buzzing around my head about using the peak value of the mains voltage (240v) and rectifying it, possibly using a 1:1 transformer for isolation.

Any ideas/diagrams from any known working similar projects would be welcome.

How close to 300v does it need to be regulated, how much current. If you are looking for cheap, there is nothing cheaper than buying a ready made module and adapting it for low current. for many amps that is a different story, then it is better off with a transformer and a buck converter, as that is a bunch of power to dissipate if you are going to use a linear regulator. I have in the past used the 480v main and a motor driver to get a regulated current output and using a welding choke with a freewheel resistor network to stop the oscillations. All depends on what you are going to use it for, as a tube circuit is again different, as that would be something such as a 6080 tube with a vr tube such as a 0b2 for reference.

 

[Terry01]

Holy €¥@£ neeb!!! Will 300v few Amp supply not need tied down good to the bench? That's a fair old jolt is it not?

 

[kellys_eye]

Holy €¥@£ neeb!!! Will 300v few Amp supply not need tied down good to the bench? That's a fair old jolt is it not?

You're not kidding - fatal voltages/currents. Only those familiar with working with such need apply!

For most experimental purposes the currents required to drive a decent valve (tube) design would be fatal if inappropriately used so precautions are VERY necessary - I won't list them, it's wise to go find out for yourself so you 'learn' the risks involved.

When you've had a jolt from a high voltage supply you learn respect VERY quickly indeed....

 

[(*steve*)]

When you've had a jolt from a high voltage supply you learn respect VERY quickly indeed...

Or you learn nothing ever again... (Just say'n)