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High Power High Frequency Supply

High Power High Frequency Supply

(OP)
Hello,
I am wondering if anyone knows of any manufacturer (anywhere in the world) that can produce a high voltage, high frequency power supply of the following specifications:

20-35kV peak
2-5 kW output
40-60kHz ouptut

single phase or three phase input it doesn't matter.

Thank you

RE: High Power High Frequency Supply

Not that I know of. Note that you're asking for rise times in the order of 3600V/µs (calculated as a rise and a fall of 30kV @ 60kHz), which is quite a bit faster than what the latest power electronics in the field typically achieves (around 1000V/µs). I suspect such a power supply would require some fairly specialised design, if it is indeed possible.

RE: High Power High Frequency Supply

What do the Tesla Coil enthusiasts use?

RE: High Power High Frequency Supply

(OP)
Yes, good point liteyear. I believe the design would call for a PWM ouput of a couple hundred volts sent into a step up transformer. I think I also encounter major core saturation problems.
Tesla coils use an air cored resonant transformer where the voltage increase is a function not of the turns ratio but of the ratio of L2/L1. It has very loose coupling and is highly inefficient. I am looking for efficiency in the range of >80%.
I wonder if this is even possible?

RE: High Power High Frequency Supply

"...20-35kV peak, 2-5 kW output, 40-60kHz..."

On the order of 245k ohms load. Piezoelectric transducer?

Try contacting those in the field of high power, underwater sonar systems.

RE: High Power High Frequency Supply

Power level at this frequency is not a problem; main problem is voltage. I think there are not a commercial product for such voltage but there are with output of hundred volts. Using such PSU with a special design step-up transformer may be a solution.

RE: High Power High Frequency Supply

(OP)
Thanks for the responses. Yes, iop995, I agree with you, and the solution will be utilizing a specially designed step up that can handle the high frequency and voltages. It will most likely have to be a very large ferrite core. I have only seen it done once and it was done by a solid state tesla coil enthusiast. By any means, I am curious if anyone knows of any manufacturer that could either tailor their production methods towards this, or are already suited to produce such a product?

Thanks.

RE: High Power High Frequency Supply

(OP)
Thanks VE1BLL

RE: High Power High Frequency Supply

The more I've thought about this post, the more its made me think that what you're looking for is more of a power amplifer or transmitter than a power supply. Low-frequency power transmitters are used for special heating applications, and even the (obsolete and dismantled) Loran system used high-power tube transmitters at around 88 kHz. The advantage of a tube-based amplifer is that the plate voltage may already be at 1kv to 3kv, so a special transformer on the output will not need a high turns ratio.

Check with Instruments for Industry (www.ifi.com). They make some standard amplifers in this frequency range and may be the kind of company that can make a modified standard product for your application.

RE: High Power High Frequency Supply

NWL (nwl.com) has a line of high-voltage switching DC supplies which includes a high-frequency inverter stage. They could probably provide a solution.

What is the application?

RE: High Power High Frequency Supply

(OP)
Thank you Comcokid and JaPaBo for the links.

RE: High Power High Frequency Supply

I would be contacting induction heater manufacturers.

RE: High Power High Frequency Supply

Interesting specs you got there. This is one of those rare instances where a fully resonant switchmode topology makes sense, both because the sinusoidal voltages (and/or currents) will be easier to handle vis-a-vis EMI, corona, etc., and because you can use the resonant tank to do voltage multiplication rather than rely entirely on the transformer turns ratio. Also, resonant topologies need leakage inductance in the transformer to function, and a high voltage secondary will, without exception, have very high leakage inductance (as a result of the thick insulation on the wire as well as the need for inter-layer margin tape).

What is the load, exactly, or is that Top Sekeret [sic]?

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