Electronics > Projects, Designs, and Technical Stuff

Programmable AC source power stage - need insight

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homem_do_saco:
Hi everyone.

Does anyone knows how the power stage of a product such as https://www.bkprecision.com/products/power-supplies/9801-programmable-ac-power-source.html might be laid out? I was particularly puzzled at the steep glitches it`s capable of: https://youtu.be/fWWU3lhEgB8?t=300 (it`s a portuguese language review, but one gets the idea from the video).

Alternatively, can anyone point me to the service manual of this product?

Thanks.

jmelson:
Well, this instrument is DESIGNED to simulate a number of abnormal conditions, such as short power dropouts, the use of SCR dimmers, etc.  I think that was a lot of what the video showed.

Jon

homem_do_saco:
I`m puzzled in a "How do they do that?" way, not in a "Why do they do that?" way.

Specifically, would generating a low impedance, lower voltage waveform and feeding that to a step up transformer be the right way?

David Hess:
It is going to be something like a class-D output stage found in a switching audio power amplifier but with a current shunt and second error amplifier to support current limiting like in a constant voltage and constant current power supply.

homem_do_saco:

--- Quote from: David Hess on July 08, 2020, 07:45:02 pm ---It is going to be something like a class-D output stage found in a switching audio power amplifier but with a current shunt and second error amplifier to support current limiting like in a constant voltage and constant current power supply.


--- End quote ---

Thought about that, however, max voltage is 300V, so, that way, it must have +-300V power rails. On a DC power source, transformer taps reduce the wasted power on the transistor, but if the waveform is AC you go through all the possible voltages in each cycle.

It can be done using SCRs, but the waveform is too clean, I think, considering it also does 500Hz AC, so any low pass filtering would be above that.

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