Description
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In this video, we will design and build a current transformer (CT) for a switching power supply application. This CT is an important part of the overcurrent protection circuit used in high-frequency power electronics systems.
The system is based on a half-bridge topology using the IR2110 driver, which ensures stable and efficient operation of Mosfet switching at around 40kHz.
We will go through:
How to calculate and wind a current transformer step by step
How to select the correct burden resistor (R burden)
How to adjust the protection threshold for proper operation
Practical testing with a real load (24V 50W lamp)
Troubleshooting overcurrent shutdown issues
After tuning the protection circuit, the system operates normally and responds correctly when the load exceeds the preset limit.
This circuit is widely used in SMPS, inverter, and high-power switching applications, especially where accurate current sensing and protection are required.
🔧 Components used:
Toroidal ferrite core current transformer
Enamel copper wire (0.3mm)
Burden resistor (470Ω in final design)
Mosfet high-voltage devices (400V+) such as IRF840
Half-bridge driver circuit using IR2110
Filtering and rectifier stage
If you enjoy DIY power electronics projects, don’t forget to like, share, and subscribe for more videos about SMPS design, inverter circuits, and PCB development.
Thanks for watching!
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