EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: Cirro on November 16, 2022, 11:14:41 am
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Hi All,
I am currently trying to teach myself about single phase active rectifiers (voltage source based) however I am having a hard time understanding how to generate a PWM pattern for the MOSFET's.
I have been playing around with the switching pattern on simulation software (PLECS). I have attached an image of my sim below, component values and inputs are shown.
The load voltage is also attached.
My question to you guys is how do I go about controlling an active rectifier, additionally can people sign post me to some useful resources, I've found it incredibly hard to find any explanations out there on this topic! Any help would be greatly appreciated!
Regards,
Cirro
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The MOSFETs are not PWMed. Look at the diodes in parallel with them. The MOSFET should be turned on when the current flows in the direction, when the diode will conduct and turn off again, when it reverses.
FETD and FETD2 need to have their gate voltages higher than the peak mains voltage to turn on properly.
Why are you doing this? It's not worth it for such a high voltage. The MOSFETs will need to be very expensive and over-rated to have lower conduction losses than silicon diodes. It's only worth doing for very low voltages, under 24V, or so.