i need help designing a current source that can produce up to 50Amps CONSTANT current for a power cycling test rig. Input voltage is up to 10V.
I have decided to replace the diode and switch in the buck converter with MOSFETs and (out of phase) synchronous pwm buck controller, due to the fact that i'm working with low-voltages. I'm having difficulty selecting the correct pwm controller and the MOSFETs as the gate voltages and gate charges have to be correlated and should also be able to stand for 50Amps current...
the current is measured using hall effect sensors (replacing resistors so that i don't mess with the voltage again!) and compared with a reference current. the feedback loop is all included in the pwm controller so the challenge for me is to measure the current and send the relevant data to the comparator.
with assumptions and calculations i have decided the inductor value to be 2μH...if that should help in anyway. i have to make this inductor by myself too!
suggestions and ideas are welcome !! =) i need to work on this fast....thanks alot!
I have decided to replace the diode and switch in the buck converter with MOSFETs and (out of phase) synchronous pwm buck controller, due to the fact that i'm working with low-voltages. I'm having difficulty selecting the correct pwm controller and the MOSFETs as the gate voltages and gate charges have to be correlated and should also be able to stand for 50Amps current...
the current is measured using hall effect sensors (replacing resistors so that i don't mess with the voltage again!) and compared with a reference current. the feedback loop is all included in the pwm controller so the challenge for me is to measure the current and send the relevant data to the comparator.
with assumptions and calculations i have decided the inductor value to be 2μH...if that should help in anyway. i have to make this inductor by myself too!
suggestions and ideas are welcome !! =) i need to work on this fast....thanks alot!
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