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Programmable AC source power stage - need insight

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Dave:
Crowbars are intended to protect a DC power supply in the event of a fault that might damage the supply. It sacrifices a fuse to protect the rest of the supply.
This is intended as a last resort protection, not for normal operation. Having a reactive load on an AC supply is normal operation.

There's no need to waste any energy, you can just push the excess back into the mains network.

David Hess:

--- Quote from: homem_do_saco on July 09, 2020, 04:57:57 pm ---
--- Quote from: David Hess on July 08, 2020, 09:32:35 pm ---Special provisions also have to be made for 4 quadrant operation with reactive loads because power can flow backwards into the power supply.
--- End quote ---

Like a crowbar if voltage or current gets over some limit, for example?

Other than that, the waveform error amplifier would take care of loads with lower power factor, wouldn`t it?
--- End quote ---

During half of the AC cycle when powering a reactive load, power flows back into the power supply.  This will increase ripple on the DC bus which powers the half bridge.  In some cases, some way to limit the maximum voltage on the DC bus may be needed.

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