new inverter concept

[noor007]

hi,
one of my friend is give me a idea that is it possible to use a buck-boost converter(micro-controller based)made a sine wave out put.the idea was for 5 ms we increase,after 5 ms we decrease amplitude & do the same thing at reverse phase.for final output we use a high pass filter to remove the carrier.if it is possible then form only boost part we made sine wave,we don't need bridge part.

please let me know it is possible or fiction.

thanks.

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sorry it will be low pass filter and 1 another thing if any one think is not possible then please explain why.

 

[Anna Conda]

This has been done numerous times over the past few decades, the enphase micro-inverters use this technology to "unfold" a "rectified" sine wave and feed it into the grid using an H bridge, it has been used for battery dischargers into the mains, however it is no good as a true inverter as it cannot handle reactive loads.

 

[kabeer02]

i will not advise you to do that because is not going to be efficient for even your personal uses

 

[mtwieg]

hi,
one of my friend is give me a idea that is it possible to use a buck-boost converter(micro-controller based)made a sine wave out put.the idea was for 5 ms we increase,after 5 ms we decrease amplitude & do the same thing at reverse phase.for final output we use a high pass filter to remove the carrier.if it is possible then form only boost part we made sine wave,we don't need bridge part.

please let me know it is possible or fiction.

thanks.

So the idea is to use a single ended DC-DC converter to generate a sine wave with a DC offset, then remove the DC offset with a blocking capacitor (effectively a highpass filter)?

Yes it's possible in theory, but that blocking capacitor would be very large and costly to tolerate such power levels. It wouldn't be a very practical design. When synthesizing AC voltages with SMPS, it is usually done with two amplifiers with a common DC bias, but the AC outputs out of phase by 180 degrees. The simplest form of this concept is the simple H bridge inverter, though it's not uncommon to see more complicated topologies used. The point is that driving the inverter from two sources with a common DC bias means that a high pass DC blocking filter is not necessary, which is a great advantage.

 

[noor007]

THX ,
everyone for comds.today i want to explain again.
normally grid tie inverter(12-220 volt/50Hz) what we do?

1st we boost 12v to 250 v,
2nd we rectifier it & filter.
3rd we use a h-bridge to make it 50 Hz ac.

but in this system is possible then what is happen.
we boost it using a set of pulse train.after that we use a LC filter to removed the carrier (high frequency part) .if we don't need to use H-Bridge part we can save a vary big amount of money.this same technology is using at low frequency iron core transformer(sine wave inverter). So there is a possibility at high frequency (ferrite core )

if any one have any link this related please shear with me .