How is the reverse recovery time defined for fast recovery diodes? — SUNMATE

How is the reverse recovery time defined for fast recovery diodes?

The definition of reverse recovery time (TR) for fast recovery diodes is the time interval between the forward conversion of current through zero to a specified low value. It is an important technical indicator for measuring the performance of high-frequency continuous current and rectifier devices.

In the fast recovery diode, IF is the forward current and IRM is the maximum reverse recovery current. Irr is the reverse recovery current, usually specified as Irr=0.1IRM. When t ≤ t0, the forward current I=IF. When t>t0, the forward voltage on the rectifier suddenly changes to the reverse voltage, resulting in a rapid decrease in forward current. At t=t1, I=0. Then the reverse current IR flows through the rectifier component, and the IR gradually increases; Reaching the maximum reverse recovery current IRM value at time t=t2.

Afterwards, under the action of forward voltage, the reverse current gradually decreases and reaches the specified value Irr at t=t3. The reverse recovery process from t2 to t3 is similar to the capacitor discharge process. It can be seen that parameters such as reverse recovery time form a gap compared to fast recovery diodes and ordinary rectifier diodes.