Sunday, January 22, 2012
HW 1 Reverse Recovery in a boost converter
It is stated that "The diode remains forward biased... until the end of interval ta." Does this mean that all of the current through the diode during the tb interval should be considered to be stored in the diode junction and recovered during the next switching event?
Subscribe to:
Post Comments (Atom)
4 comments:
I think if you write a KCL equation at the node and considering that the inductor current is constant, then the current of the diode ( Figure 2) determines the switch current ...
you would have a current over-shoot for the switch current ...
I agree with what both of you have posted. The stored charge in the diode junction is recovered during the FET turn-on, acting like an additional current at the node where i_L, i_T, and i_D meet, resulting in an overshoot of the i_T current waveform. Lectures 8 and 9 of ECEN 5797 were helpful.
Good comments. On the original post, please be careful: it would be wrong to state that "current ... should be considered to be stored..." Current cannot be stored. Charge can be stored.
Post a Comment