Sine wave Inverter Project

[faizanbrohi]

Please post all yor comments regarding a sine wave inverter here.

a Class D amplifier schematic would be fruitfull

 

[faizanbrohi]

Since Class D Ampilifiers are cold amps or have 100% theoratical efficiency with upto 94% practical efficiency . it is very much suitable for a sine wave inverter design , however i was able to look up a site which is open source class D Amplfier Site

http://hem.passagen.se/johanps/index.htm

Please take a look

 

[audioguru2]

To make 230VAC with a sinewave, the output of the amplifier must be 650Vp-p.
So it is practical to make a class-D amplifier with a low output voltage but a high output current then stepup the voltage with a transformer.

 

[faizanbrohi]

please take a look at the link i posted above , i think it is a simple and effective design. but i can't find how much power it is delivering

 

[audioguru2]

please take a look at the link i posted above , i think it is a simple and effective design. but i can't find how much power it is delivering

The archive notes say 102W into 8 ohms or 180W into 4 ohms. It quickly got very warm with 180W output and so the mosfets need better heatsinking.
Efficiency was about 86%.
Note that its power supply is positive and negative 50VDC. About eight 12V car batteries in series would power it.

 

[faizanbrohi]

hmm i think probably it would be nice to use a bigger 12V battery and use a DC-DC Converter

 

[audioguru2]

hmm i think probably it would be nice to use a bigger 12V battery and use a DC-DC Converter

Then you are making a class-D car amplifier that doesn't have as much power as the ones you can buy.

 

[faizanbrohi]

Cannot we shape the wave of a square wave output to sine wave

 

[faizanbrohi]

I mean to say the output from the transformer that is square wave. and it is shaped to sine wave

 

[audioguru2]

Cannot we shape the wave of a square wave output to sine wave?

Sure, you can use a couple of RC lowpass filters or an LC tuned circuit. Then the load must be a high impedance so no power can be drawn.

 

[faizanbrohi]

Can you suggest a circuit for the waveshaper , that you were saying using the RC filters

 

[faizanbrohi]

and how powerful they should be to withstand 220V ac at the output and a power of 500W

 

[audioguru2]

Can you suggest a circuit for the waveshaper , that you were saying using the RC filters

I said that if a wave-shaper is used at the output then the load must be a high impedance which takes no power output.

 

[faizanbrohi]

So can we make multiple cascaded Class D amplfier IC you suggested and make it  upto 1000W or the Class D amplfier i gave , can we ???

 

[audioguru2]

So can we make multiple cascaded Class D amplfier IC you suggested and make it

 

[faizanbrohi]

So making a transistorized Class D amplifier can be a good choice , the one i showed you

 

[faizanbrohi]

Cascaded can be done in a transistorized circuit

 

[faizanbrohi]

Audio Guru Please i need your help in the Stereo power amp 2x40W = 80W the topic i have started . i have done the PCB and its layout , a schematic from the PCB layout can be really appreciated , please , thanks  :

 

[audioguru2]

This thread talks about sine-wave inverters, not the amplifier in your other thread.