mgarbuli
New member
Hello people!
I´m working in a quadratic boost converter, i need to boost a 60 Vdc power supply to 350 Vdc, output currente of 2 A.
I have found some papers in the net about that, and i designed a circuit like the picture.
The frequency is 50 kHz, controller TL 494 with maximum duty cicle of 65%.
With half load (1 A), the mosfet is very hot, the raise of temperature is very quickly (in few seconds the temperature is about 80 celsius degree). The maximum peak current in the drain is about 9 A and the current in the inductors is about 8,5 A. I have a large heatsink.
I have changed the gate resistors with values between 1R and 22R but it doesn´t make effect.
What can cause this problem? I believe that the problem is about a big current circulation but i can´t see where it is happening.
Thanks in advance!
Marcelo.
I´m working in a quadratic boost converter, i need to boost a 60 Vdc power supply to 350 Vdc, output currente of 2 A.
I have found some papers in the net about that, and i designed a circuit like the picture.
The frequency is 50 kHz, controller TL 494 with maximum duty cicle of 65%.
With half load (1 A), the mosfet is very hot, the raise of temperature is very quickly (in few seconds the temperature is about 80 celsius degree). The maximum peak current in the drain is about 9 A and the current in the inductors is about 8,5 A. I have a large heatsink.
I have changed the gate resistors with values between 1R and 22R but it doesn´t make effect.
What can cause this problem? I believe that the problem is about a big current circulation but i can´t see where it is happening.
Thanks in advance!
Marcelo.
Attachments
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Quadratic-boost-converter.png