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transformer selection for 250w inverter

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dave_j_fan:
i want to get an ei transformer for a hbridge driven inverter

my doubt is  for  250w 9,0v to 220v transformer what current needed?

for centertap design i understand 1/2 *(250/9)x0.15Amp is approximate current.1/2 because twocoils in CT.

So for HBridge invi with one coil,what is current needed assume15% loss.

also why there are many voltages in Ups trandformers
like 190 ,220,230

Zero999:
Please provide more information. What's an ei transformer?

The losses in transformers are primarily voltage, rather than current. The fully-loaded secondary voltage is lower, than the turns ratio, because of the voltage drop associated with the resistance of both primary and secondary windings. The current loss is an extra current being drawn due to the eddy and hysteresis losses and is relatively small.

dave_j_fan:
E I iron core.

not ferrite . so to get a good performance
what will be amp rating if we use 0-9v highcurrent side

NiHaoMike:
Pretty much every inverter transformer I have come across was custom made for the application.

--- Quote from: dave_j_fan on February 03, 2020, 01:23:25 pm ---E I iron core.

not ferrite . so to get a good performance
what will be amp rating if we use 0-9v highcurrent side

--- End quote ---
You won't be able to use a particularly high PWM frequency with laminated iron cores, there's a reason every modern 250W inverter uses ferrite cores. There's also powdered iron cores and amorphous iron cores, but there's no savings using those for a 250W inverter.

Zero999:
Oh, I see, the all lowercase confused me.

I believe he wants to use a low frequency power transformer, like an old school inverter. The problem is he also wants it to be cheap. A low frequency transformer is not a cheap option, which is to use a high frequency ferrite transformer, running at a much higher frequency and a rectifier and filter, to make a DC:DC converter, followed by an H-bridge to make an inverter. The extra cost of the more complex electronics will be outweighed by the smaller, lightweight transformer.

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