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In my recent spare time i have been stripping down a solar PV inverter to better understand how it operates and performs. So far i have identified most of the components and what they do, however i have discovered some quite large components that i believe could be a type of choke. They are not mounted on the PCB`s.
Can anyone offer me any advice on what these components do within the inverters and are they a perishable part. They look very robust.
The inverter I have been looking at is a small single phase domestic unit of 3.6kW.
There will be inductors, both for EMC, and as part of the inverter proper.
Photos added - I hope.
These are situated in the very top part of the inverter.
Without seeing how they were wired in there are a number of places in an inverter design that such reactors may be used, but commonly for un-gapped cores they will be in series with the AC output, to take the edges off what would otherwise be a very square switching waveform, and make it a bit more sinusoidal before it joins the outbound mains.
The highly simplified circuit here so simplified it has none of the electronics that creates the switching waveform, may illustrate this.
The upper two appear to be split bobbin construction, and may be transformers or chokesor if in series with the output, then they may be current monitoring as well as chokes. - how many wires go to each one?
The ferrite ring (well more of a tube to be honest ) at the top is an EMC feature, and as a number of wires share the core, it is presumably acting to raise the common-mode inductance.
Do come back if this is at the wrong level and makes no sense, or if you would like more information - happy to help.
That is really helpful thank you.
The top have 2 wires each coming from them.