Very Reliable 60Watt (12Volt – 220Volt) Inverter Circuit Using IC 4047

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.

Best Circuit of 60Watt Inverter

Best Circuit of 60Watt Inverter using IC 4047

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.

  • Input
  • Oscillator
  • Driver
  • Output

Input Section

The input section of the circuit consists of a 12 volt battery and a switch. The 12Volt power supply is fed to the circuit.

Oscillatory Section

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.

Driver Section

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).

Output Section

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.

Best 60Watt Inverter

60Watt Inverter

Component List

  • 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)
  • Fuse
  • 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)

Comments (18)

  1. Rajinder Dhandwal

    Reply

    It is the best described circuit that i have seen on the internet. You do it very nicely. Keep it up.

  2. Mohammad Ijaz

    Reply

    What company transformer would you recommend for this inverter. I am using 12V transformer but it is getting heated up.

    • Reply

      Thank you for your comment. Please use 12-0-12 Guru Transformer with a minimum of 3 Ampere rating. You can buy it online or from your local electronic component store.

  3. jagat singh

    Reply

    thank you sartaj for this circuit. it works. thank you for detailed explanation on this best inverter circuit. it is working fine even without heat sink. can you please advice if it is fine if i don’t use heat sink. thank you in advance

    jagat

    • Reply

      Yes. It is the best inverter circuit on the net and has been tried and tested under many test conditions. It works flawlessly. You just cannot ignore the use of HEAT SINK in this circuit. When the full load of 60Watt is drawn the transistors will heat up substantially and may burn if not properly heat-sinked. It is highly recommended that you use heat sink. You may find transistors NOT getting heated when there is no load… if that’s the case, then be warned they might heat up on the connectivity of load. So do not ignore the use of heat sink.

      Thank you for trying this circuit.

  4. Anil Sharma

    Reply

    Can you please let me know the wattage of all the resistors? Also what is the role of IC . Can I avoid it some way?

  5. Rishi Garg

    Reply

    What other things can be derived from this inverter apart from a regular 60watt lamp. Can you please specify also, how do i increase the wattage of the inverter upto 500 watt minimum. Can this ciruit handle such load?

    • Reply

      This best inverter circuit can be used to easily run Battery Chargers, Ceiling Fan, Tubelight, Water Purifier, Digital Clocks, Small Coolers, Small Motors… and more. Also, please note this circuit cannot derive a load of 500 Watt. and this cannot be changed to handle 500 Watt loads. For that you need to redesign the circuit to handle larger loads. The scope of that type of inverter is beyond the Q&A section here.

  6. Amir Durrani

    Reply

    Does this circuit give 50hz frequency? What is the recommended battery for this inverter also can use larger battery on this small circuit?pls reply

    • Reply

      Yes. The circuit can be calibrated to give accurate 50Hz frequency. You can use 2 batteries in parallel to increase the time of duration of inverter backup. But, please ensure that the load never goes above 60 Watt. Please note double battery in parallel does not give you leverage to use higher wattage of load… it only makes your load run much longer. Hope it is clear now.

      Thank you for such question.

  7. Sona Singh

    Reply

    Can you please specify the replacement for 4047 ic. The equivalent ic.

  8. Javed Hassan

    Reply

    Can i use 2 x 12. Volt batteries to power up the inverter for long hours or will the transistors heat up?
    Please do reply as soon as possible.
    Thank you
    Javed Hassan (bangladesh)

    • Reply

      Yes. You can use 2 x 12 Volt batteries to power up the inverter. Please note the load at the output should not go beyond 60Watt load. It will double the usage period and will not over heat the transistors.

      Hope it helps.

  9. Harsha vardhan

    Reply

    Ur circuit is awesome and can i use higher Ah battery in order to use for more time with out exceeding 60 watt load .If yes what is the range of ah minim to max of a battery which we can use with respective time ,and can i use one single high Ah battery and two same circuits each for different load which is below 60watt load of different devices.

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