This project is a simple boost converter that boosts a voltage of 6v DC to high-frequency AC and converted with a full bridge rectifying diodes with a capacitor at the output you can also adjust the voltage to your desired voltage, which can range from 5v to 100v dc depending on your usage and application and the funniest part of this project is that it doesn’t use any ic, the oscillator circuit is built using two transistor astable multivibrator circuit the frequency of the oscillator 20khz
So below are the components needed to make this project
- Mosfet irf3808
- All transistors are 2n2222a
- Pc817 optocoupler for feedback sensing
- variable resistor 33k
- capacitor are 102J 3pcs, 16v 470uf 2pcs, 400v 22uf, 50v 10uf
- Diodes are: bridge rectifier 2amps, 1n4007 zener diode 3.0v
- Led indicator 1pc
- chopped ferrite transformer primary turns = 4tns, secondary turns= 60tns , feedback wind turns = 10 turns
- Resistors are: 100k 1pc, 20k 2pcs, 500R 2pcs, 100R 1pc, 1k 2pcs
- Thick heat sink for MOSFET to prevent overheating
- Vero perf board
- Efficiency: The efficiency of the circuit can be increased by choosing the right component values, reducing the losses in the inductor and diode, and ensuring good thermal protection of the MOSFET.
- EMI/RFI: Switching converters can generate electromagnetic interference (EMI) and radio frequency interference (RFI). To reduce EMI/RFI, use the right filtering components and layout techniques.
- Safety: Switching converters can generate high voltages and currents that can be dangerous. Be sure to follow the right safety measures when building and testing the circuit.
In summary, building a DIY SMPS boost converter without an IC can be challenging, but it is possible with careful planning and assembly. It’s important to choose appropriate components, follow the schematic and assembly instructions carefully, and test the circuit thoroughly to ensure reliable operation.