300w power inverter using TL494 with feedback

300w power inverter using TL494 with a feedback system. This inverter working based on a high frequency. It’s working based on about 30-50khz. So the EI33, or EE35 ferrite core transformer.

300watts inverter PCB layout

The inverter working based on the switching ic of TL494. the ic will generate the high-frequency pulses (about 30khz). The pulses will be amplified by the MOSFET of IRF3205 and pass through the transformer and the Fast diodes will be rectified and give the power output.

TL494 ic pinout

List of components

• EE35 transformer – 1
• TL494 ic – 1
• IRF3205 – 2
• 4700uf/25v – 1
• 1000uf/400v – 1
• fast diode – 4
• 8550 transistor – 2
• 4148 diode – 2
• 50k preset pot – 1
• 10R resistor – 2
• 10K resistor- 3
• 20k resistor -2
• 2.2k resistor – 1
• 1k resistor – 1
• 333 pf capacitor – 1
• 102pf capacitor – 1
• 470k resistor – 1
• 10uf/25v capacitor – 2

Download PCB layout

Transformer winding

Take EI33 or EE35 high-frequency transformer (ferrite core) The primary winding should be 3+3 turns with 18 swg copper wire or 3 combined 22swg wires. Secondary turns with 22swg wire of 90 turns.

Input voltage

Use 12 volt 20A battery to get 300watts output,

Adjust the preset to set the output voltage to 240 voltage by measuring with a voltmeter.

Use IRF3205 or IRFZ44, in my recommendation use IRF3205 because of the high power handling capacity of the MOSFET. comparing with the two mosfets the irf3205 is the best choice. use a proper heat sink for heat dissipation. large heatsinks will reduce the overheating issues. use thermal past for protecting each MOSFET from a short circuit.

if you have any doubts in this article just comment here I will resolve the issues as soon as possible.