Re: Converter 12v dc / 220v AC schematic.
Hi,
Using power transistors will cause plenty of heat. It's better that MOSFETs are used.
Take a look at this:
Added after 38 seconds:
But, if you're looking for something high performance, you should be using a PWM chip like SG3525/SG3526.
Added after 20 minutes:
Using four MOSFETs helps to use a lower cost transformer. If you use two MOSFETs, you'll need a transformer with centre-tapped 10v.
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KRYCHEK said:
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
Hi,
The setup will be:
12VDC > Inductor > Capacitor Bank > 12V DC Power
12V DC Power > TL494 > Push-Pull MOSFETs > Ferrite Transformer > Bridge Rectifier > Inductor > High Voltage DC Bus Output of around 300v for 220vac required output.
12V DC Power > 50Hz Oscillator > MOSFET Hi-side, Lo-side Driver > H-bridge > Inductor-Capacitor Filter > Required output voltage.
Hope that's cleared.
For 50Hz oscillator, I don't think you should use TL494 as it would be outside the specified frequency range in the datasheet. Instead use KA3525(!not SG3525) or SG3526. It has two outputs. Connect these to two hi,lo side MOSFET drivers(IR2110/IR2113/L6384/L6385/L6387).
Take a look at the circuit and carefully go through the datasheet of the hi/lo drivers.
I've done plenty of switching inverters like this. If you have any questions/queries, you can ask over here.
Hope this helps.
Tahmid.