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High Voltage Supply Topologies

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sabu31

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Hi,

What are the typical semiconductor based topologies used for high voltage pulsed power supplies typically output of 40kV-50KV for Pulse Electric Field (PEF) application. The average power is 500W to 1kW with pulse duration of 2 microsecond frequency of 1000Hz. Is there any references/books on such types of topologies.
 

Well first of all, what you're describing is more of a power amplifier than a power supply.

Depends specifically on the waveform you want to produce. Using a step-up transformer on the output certainly makes the design much simpler, but puts restrictions on the waveform shape (must be AC-coupled).

If the waveform just needs to be a quick transition between two voltage levels, and you don't need to control the edges of the waveform very precisely, you could probably just use hard-switching semiconductors instead of an analog amplifier circuit.
 

Thanks for the reply.

What topologies can be used. Can we use Push Pull topology for such high voltage rating or what are other possible topologies structures.
 

usually a step up to a 1kV cap, then fast discharge into a suitable low loss step up Tx, with wave shaping after that ....

multiple ("n") caps and firing ckts to allow cap recharge in time for the next/n pulse ...
 

I doubt that transformers are a reasonable way to achieve the source parameters mentioned in post #1. You would consider a 50 kV DC supply and cascaded transistor switches. If push-pull or single ended depends on the load impedance and intended pulse shape. With a dominant real load, single ended may work, otherwise push pull.

Alternatively a Marx generator topology could be considered, reducing the DC supply voltage by a cascade factor.
 

A purpose-built transformer could easily make a 2us, 50kV pulse. And IMO it's easier than balancing a cascade of a couple dozen high voltage semiconductors. The waveform wouldn't be as clean as what you could achieve with a direct high voltage driver, but it's not clear what the OP's needs are.
 

    E

    Easy peasy

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Hi all,

The waveform needs to be bipolar and flat top. I found two paper regarding the system. However, since these are in academic papers and relatively recent, I am not sure if I can validate and use for actual implementation.

One of the papers suggest a capacitor charging circuit followed by inverter with a high voltage transformer.

What could be simplest and robust method to implement and which have been adopted by industries for high voltage application.
 

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