This circuit includes two MOSFETs IRF540N and one BC549 transistor and some resistors. By varying the 20k pot adjust the frequency of the output wave. The output frequency depends on the capacitor C1, 20k potentiometer, and R1 resistor. The 555 timer IC generates a square wave of 50/60Hz frequency. Make Sure the battery ampere-hour should be enough to drive the 100watt load on the output.Īdjust VR 20k (pot.) to get 50 or 60Hz frequency. The transformer steps up the voltage to 240V. So, PWM of 50Hz or 60Hz is produced which drives the transistors to change the voltage w.r.t time because Transformers work on AC. Some resistors and capacitors are used to do this function. Working of 12v to 230v inverter circuit diagram using 555 IC:ĥ55 IC is a timer which is used to generate time delay with great accuracy. Differences in transformers, transistors, parts substitutions or anything else not on this page may cause it to not function.For more details on ic 555, you can download the datasheet below the article. Regular electrolytics will overheat and explode. You must use tantalum capacitors for C1 and C2. Since this basic inverter project produces 120 VAC, you must include a fuse and build the project in a case.ĥ. Remember, when operating at high wattages, this circuit draws huge amounts of current. The 2N3055’s in the parts list can only handle 15 amps each.ģ. Remember to use high current transistors for Q1 and Q2. Enamel covered magnet wire works great for this. The guage of the wire will depend on how much current you plan to have the transformer supply. Now, wind on 12 turns of wire, twist a loop (center tap), and wind on 12 more turns. Now, remove the old 2000 V secondary, being careful not to damage the primary. If you want, you can test the transformer, but they are usually still good. Remove the transformer, being careful not to touch the large high voltage capacitor that might still be charged. The bigger the microwave the bigger transformer. Go to a local TV repair shop and dig through the dumpster until you get the largest microwave you can find. These transformers are rated at about 1KW and are perfect. The easiest and least expensive way to get a large T1 is to re-wind an old microwave transformer. Larger transformers and more powerful transistors can be substituted for T1, Q1 and Q2 for more power.Ģ. With Q1,Q2=2N3055 and T1= 15 A, the inverter can supply about 300 watts. Q1 and Q2, as well as T1, determine how much wattage the inverter can supply. 24V, Center Tapped Transformer (see “Notes”)ġ.

Inverter generator schematic diagram