This help to prevent the device from conducting large negative current, which in turn reduce its reverse recovery charge and reverse recovery time.
3.
Most ordinary diodes, even " slow " power silicon diodes, are able to turn on very quickly, in contrast to their slow reverse recovery time.
4.
A certain amount of " reverse recovery time " t r ( on the order of tens of nanoseconds to a few microseconds ) may be required to remove the reverse recovery charge Q r from the diode.
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