Electromecanico

250 to 5000 watts PWM DC/AC 220V Power Inverter
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Author:nickk
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This is my schematic design of a PulseWidth Modulator DC/AC inverter using the chip SG3524 .
I have built this design and using it as a backup to power up all my house when outages occur.

If you intend to build the circuitplease rate me so i know how many people benefit from the design, Thanks

Notes:

-The schematic circuit design is for a 250 watt output, while the pics are of my 1500 watts inverter that i built, toincrease the power of the circuit you have to add more of the Q7 and Q8 transistors in parallel, each pair you add will increase your power by 250 watts, ex: to get 750 watts of power from the inverter youneed to add 2 of Q7 and 2 of Q8 to the original design.

--If you increase the power transistors you have to enlarge the T2 transformer to match the new needs, the circuit's transformer is rated 25amps to handle 250 watts of 220v, for every 1 additional amp you need on the 220v side you have to increase 10 amps on the 12v side, of course there are limits to the thickness of the winding so if youneed more than 750 watts i recommend that you use a 24VDC supply instead of 12 volts:

DC voltage and Transformer "T2" winding recommendation:
Power     Supply     Winding
750w       12VDC    P:24V "12-0-12" / S:220V
1500w     24VDC     P:48V "24-0-24" / S:220V
2250w     36VDC     P:72V "36-0-36" / S:220V
3000w     48VDC     P:96V "48-0-48" / S:220V
3750w     60VDC     P:120V "60-0-60" /S:220V
4500w     72VDC     P:144V "72-0-72" / S:220V
5250w     84VDC     P:168V "84-0-84" / S:220V
*The transformer should be "center tapped" at the primary side.
**You can make the secondary110v if needed.
***The transformer in the pic is a custom made (48V center tapped / 220v ) 2000 watts, weights like 10 kilos.

--R1 is to set the PWM to 220v
--R2 is to set the frequency to 50 or...