R
Hello,
I wonder if one could build a pure sine inverter using a single stage DC-AC converter.
The classical implementation is to build a DC-DC converter (24V -> 350V in my case) then use a sPWM driven MOSFET full bridge to get the 230V AC output.
My question is: can I use a single full bridge stage (sPWM driven) to convert a 24V ("bus") input to a 230V AC output?
Actually, instead of driving the classical DC-DC (24V -> 350V) converter with a simple PWM signal, could I use a sine modulated PWM signal to get the AC output voltage directly?
I've seen this implementation in LF output transformer inverters; they convert 24V DC to 16V AC which feed a standard low frequency (50Hz) transformer to get the 230V AC output.
Now, if you feed it with 12V AC, math leads to 12 * (400/20) = 240V (AC). So I get 230V (2-3 kW) without modifing the welding transformer.
It that correct? Are the welding transformers a feasible solutions? I was thinking of a bigger transformer (10KVA) because their normal duty cycle it's about 10-20%, so for a continuous 2kW output I think it's a fair solution.
There comes in mind my previous idea: the use of a 1:1 ratio ferrite transformer in a sinePWM driven full bridge stage followed by a 50 Hz LLC filter to get the 230V AC output voltage - but I've never seen it implemented yet.
Anyway, I have another topology question: I have four smaller LF-transformer based UPS. May I build a bigger inverter using those LF transformers?
May I put them in parallel (primary/secondary) if they are almost identical (same manufacturer/model)?
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