Ryobi Gen Sine Wave Test

[DaveInDenver]

You may be right that it's not a native speaker but he may be trying to explain that it's a high frequency inverter.

These are sort of the concepts.

A regular inverter (typically marketed as pure sine if its modulated & heavily filtered):


A high frequency inverter:


The advantage to this is a HF transformer will be a lot smaller than one you'd have to use at low frequency. It would generate an intermediate AC in the ~50KHz range that is rectified, stored in Lf/Cf and a low frequency AC output generated. IOW, DC->AC->DC->AC. Not completely sure what he might mean in 3-phases other than he's referring to the alternator.

In either case the transformer is necessary for galvanic isolation (safety) and so that you can earth the output.

Reference (graphics used without approval): https://www.researchgate.net/public...r-less_Inverter_for_Photovoltaic_Applications

 

[DaveInDenver]

Actually re-reading that statement, it's probably not a HF inverter but just an alternator & rectifier (e.g. "AC/DC") for the inverter ("to AC"). It's probably a relatively clean PWM inverter and probably does not have a transformer at all.

 

[dwh]

I agree, I think he's just attempting to descibe the normal AC to DC to AC conversion that all inverter generators do.

 

[DaveInDenver]

Indeed, probably nothing exceptional.