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dc/ac 12V to 220V inverter ,i need electrical shematic?

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sloman

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small ferrite transformer

please,i need electrical shematic dc/ac inverter for transformator 300W ,for school project and i have only tvo days left to finished that project and i can`t find shematic for dc/ac. Please help mi !!!!!!!!!!!!
 

There are many inverter schematics linked with a search on Google. Some work and others don't.

One has its capacitors backwards and they blow up. Its transistors have avalanche breakdown through the capacitors that also blows them up when their polarity is correct. The transistors don't have enough base current for a powerful inverter.

Some inverters are square-wave, some are modified sine-wave and some are true sine-wave.
 
hi, u can use a osc. circuit to drive a push-pull amplifier. Using a transformer to change DC to AC.
 
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    hifni

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tvthang said:
hi, u can use a osc. circuit to drive a push-pull amplifier. Using a transformer to change DC to AC.
Click to expand...
It cannot be a sine-wave. Because then the amplifier will waste half the power from the battery making heat. It must be a square-wave or a modified square-wave.

Sine-wave inverters use a high frequency DC to DC stepup circuit using a small ferrite transformer, then a pulse-width-modulation circuit with a high frequency carrier to make stepped waves, then filter it with a small filter to smooth the steps.
 

Push pull amplifier oscilator WOW new stuff is born.:D
 

hi am wondering if anyone can help me.

Am building an high frequency switching inverter using the tl494,and using a H bridge,

can anyone assist me on how the H bridge converts dc back into ac, i mean how do i do this, and how do i get 50hz from this, many thanks

12vdc.....tl494...push-pull mosfets....transformer...bridge rectifier...h bridge...lc filter..

what i need to know is how to switch 2 on and 2 off at same time resulting in ac 220v 50hz, if u know
what i mean

this is a mod-sine wave btw

many thanks
 

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