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Old 09-25-2011, 02:26 PM   #5 (permalink)
thingstodo
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Quote:
Originally Posted by IamIan View Post
Most such inverters are not designed to operate in a series synchronized system like that ... care is needed else the magic smoke escapes.

How practical it may or may not be will depend greatly on the design of the DC-DC stage ( may not work like that at all ) , the person doing it, and how such this option compares with other alternatives for time and $.
I would be surprised if the original designers had envisioned this as a possible end use. I'm trying to be careful.

There are two 'boards', the boost converter that takes 12V and makes 150V, and the output inverter that takes 150VDC and makes 120V AC modified sine wave.

I'm breaking into the DC between the stages, so I'm trying to be paranoid about isolation. The DC has some ripple. The DC 'bus' capacitors take up a lot of room - I have no schematic so it's difficult to determine if it's safe to series these inverters.

The input terminals appear to be isolated from the DC bus - and +, the case/heat sink, and the output AC. Similarly, the DC bus - and + appear isolated from the case/heat sink. The DC bus is not isolated from the output AC.
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