Building and Experimenting with a Forward Converter
Ғылым және технология
Let's build a forward converter! In this video I'll briefly explain how it works and the theory behind it. Then I wind a transformer and build the circuit.
I also see if we can improve it by putting the demagnetizing coil on the secondary side.
The turns ratio of the transformer are about: N1 = 25, N2 = 20, Ndemag = 18. I lost count while making it so this is approximate. In general always use N1 = Ndemag!
Thanks for watching!
0:00 Intro
0:32 Explanation
1:59 Winding the transformer
3:10 Testing the circuit
5:04 Secondary demagnetization
6:49 Conclusion
Music: Kevin MacLeod - Space Jazz
#electricalengineering #mosfet #powerelectronics #forwardconverter
Пікірлер: 7
Very cool, i love switch-mode converter experiments and have done some myself. I have to try this!
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I don't know what you mean by the "step-down nature of the converter" at 5:58 because moving the de-energizing coil to the secondary side of the coil made the transformer a "step-up transformer", did it not? This is the way it appears to me, as omitting the de-energizing coil would make the transformer neither step-up nor step-down, but rather an isolation transformer, would it not?
@5VLogic
7 ай бұрын
So, the forward converter is a step-down (assuming a 1:1 transformer ratio) because it behaves like a buck converter (with the classic input-side demagnetizing). We can intuitively verify this by observing the voltage on the L1, D3, D5 node to be a square wave with amplitude = Uin and duty cycle Once we move the demagnetizing winding to the output, it becomes a forward and flyback combined. This makes it potentially a step-up.
very nice, thank you for posting. I guess you are using NE555, but can you pls share the frequency and duty cycle? thank you
@5VLogic
7 ай бұрын
The frequency is about 60kHz while I vary the duty cycle as visible on the oscilloscope bottom trace (~30% ~70%)