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Reverse Recovery Time of a Diode
May 30, 2018

In modern pulse circuits, transistors or diodes are widely used as switches, or logic integrated circuits that are mainly composed of them. The diode used as a switch is mainly used to make use of its conduction(small resistance) and broken (high resistance) characteristics, that is, the switching effect of the diode on the forward and reverse currents. The difference between the diode and the general switch is that the "opening" and "closing" are determined by the polarity of the added voltage, and the "open" state has a small pressure drop Vf, and the "off" state has a tiny current of I0. When the voltage changes from positive to reverse, the current does not immediately become (-I0), but in a period of time Ts, the reverse current is always very large, and the diode does not turn off. After ts, the reverse current gradually becomes smaller. After tf time, the current of the diode becomes (-I0). TS is called storage time, and tf is called drop time. Tr=ts+tf is called reverse recovery time, and the above process is called reverse recovery process.