TL494 Inverter & High Voltage Switching Power Supply | 1kW | ElectroBUFF

1KW Inverter & High Voltage DC Switching Power Supply using TL494

Circuit Diagram:

TL494 inverter & High Voltage SMPS 

YouTube Video Tutorial:

https://youtu.be/FMLPmfUZ678?si=vVHpRarkmfz1MkJZ

Project Working Principle:

The circuit is composed of :

High frequency Push-Pull Oscillator driver made up of the TL494 PWM IC and the various biasing components. The output frequency is set at about 50kHz by the timing resistor connected to Rt pin 6 and the timing capacitor connected to Ct pin 5.

tl494 frequency formula calculation

tl494 push pull oscillator output

Current amplifier made up of the BJT pairs of BD139 and BD140. They basically relieve the tl494 the burden of supplying the higher current needed to switch the power Mosfet ON and OFF very quickly.

Power Mosfet Switches which operate as push-pull inverter drivers. They conduct current back and forth from the power supply through the ferrite power transformer primary windings. Use high quality Mosfets as indicated on the schematics. Don't forget to mount them on proper sized heat sinks and include forced air cooling via a fan if possible.

Mosfet switching 1

Mosfet switching 2

Ferrite Power Transformer. It transfers energy between its windings, the low voltage input power supply is stepped up to a higher voltage depending on the winding rations between the primary and secondary windings. Choose the core size accordingly to the required power. 

ferrite power transformer choice

Ferrite transformer Chart table

Rectifier Diodes and filter capacitors. At the secondary side, the high frequency AC is rectified to DC and smoothened by a capacitor to obtain high voltage DC.

Diodes

TL494 Inverter PCB

pcb 3D view top layer

pcb 3D view bottom layer

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