Electronics > Power/Renewable Energy/EV's

Simple , cheap , portable inverter is poor?

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Faringdon:
Hi,
The attached, LTspice and PNG, shows a very simple low power portable inverter schem. Not pure sine, but
most loads are a bridge rect followed by a smoothing cap, then an SMPS, ..so that doesnt need a 50Hz sine anyway.
The AC "thing" is  necessary, but only so that one half of the bridge rect doesnt possibly burn out.
Probably a waste of time though, a simple cascaded booster from 12V to 350V  would suffice, but there you go.

Anyway, the ground of the 350VDC supply would be the same ground as the 12V battery, which is likely to be earth
ground. So the connections to the external SMPS are going to be pinging up and down like mad by 350V.

As such, i am sure you would agree this setup is not good?

Jeroen3:

--- Quote from: Faringdon on March 18, 2024, 09:35:13 pm ---Anyway, the ground of the 350VDC supply would be the same ground as the 12V battery

--- End quote ---
No. That should not be the case. The 350V should be from an isolated DC-DC converter stage.

*op identity notice*

jpanhalt:
Is there a purpose in analyzing poor designs that so far as we know do not exist commerce?  And even if they did, then what?

Faringdon:

--- Quote ---The 350V should be from an isolated DC-DC converter stage.
--- End quote ---

In this case, the input is likely to be from a battery...since its a portable inverter...so as such the battery is already isolated.
However, in many systems, someone  may earth the battery ground.

Also, the use of an inverter in this bridge form, is poor, since the attached shows that the outputs of this inverter are banging hellishly up and down with respect to the battery (input) ground.

jonpaul:
FTSS TROLL...IGNORE GARBAGE

j

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