Inverter circuit is one of the most common circuits on the internet with various types of combinations of components yielding moderate to very good output. However, on various facebook groups and pages I have come across various junk circuits that can literally make a hole in your pocket and will not work. Such rouge circuits will not only make a serious dent on your hard earned money but will also hurt your moral. It takes time and patience to make circuits and you would not want to waste it on useless circuits – would you? Further, a rouge circuit may give you an unexpected shock.
Here is another one of my ‘Class Project’ – ‘60 Watt Inverter’ that I have developed for a friend of mine. It is working nicely.
It is wired around IC 4047 and 2 MOSFET IRFZ44N transistors and the output from the circuit is capable of deriving a load of upto 60 Watts. A 60 Watt load can be powered for 4-5 hours continuously for 1 battery cycle. This circuit is very reliable in rendering a constant output. So just try it.
The Inverter Circuit presented here has 4 Sections.
The input section of the circuit consists of a 12 volt battery and a switch. The 12Volt power supply is fed to the circuit.
The oscillatory section of the inverter circuit here consists of a 1MΩ Preset, 0.1uf Capacitor and the heart of this section is a CMOS Monostable/Astable Multivibrator IC 4047. Oscillatory frequency generated from the IC is determined by adjusting 1MΩ Preset (connected between pin 2 and pin 3) and with the value of capacitor. 0.1uf capacitor (connected between pin 1 and pin 3) can help IC oscillate to a frequency of upto 10khz, however, we need 50hz/60hz for the inverter circuit to operate satisfactorily. This can be done by adjusting the preset. I recommend if you have an access to an oscilloscope then use it to calibrate. The output from the IC is achieved on pin 11 and pin 10.
When the output on pin 11 is high then the output on the pin 10 is low and vice versa – generating two square waves (one on each pin). These output pins oscillates based on the values of capacitor and preset adjustment. The outputs from these two pins are fed to the driver section of the circuit.
The driver section uses 2 MOSFETS transistors IRFZ44N. The outputs from pin 10 and pin 11 (of 4047) are fed to the gates of these two transistors (via 220ohm resistors) and the Drain (D) out from the transistors are fed to the Transformer’s 12V secondary windings (in this case). These transistors will oscillate alternatively based on the inputs from the IC hence driving Transformer – which will further induce electricity to the secondary coil ( which actually is primary 220V side of the transformer 😀 – don’t be confused we are using transformer is a reverse order).
The output section consist of 12-0-12V transformer. Which will take the square waves generated by the IC and amplified by the transistors to a 220V output on the secondary coil (the 220V winding side). The output from the output will be able to derive a load of upto 60Watt for 3-5 hours without any hiccup.
The circuit is well tried and works nicely. Hope you like my efforts.
- Resistors: 220Ω x 3
- Variable Preset: 1MΩ
- Transformer: 12-0-12 (3 Amp)
- Transistors: IRFZ44N (MOSFET) x 2
- Heat Sink for Transistors
- IC 4047 (with a 14 pin Base)
- Switch: SPST (10Amp)
- Capacitor: 0.1µf
- 12 Volt Battery
- General Purpose PCB
- 220V Bulb Holder
- 60W Bulb (to test max output) or LED bulb
Price: Rs. 400/- (excluding battery)