Reverse recovery time of fast recovery diode

Reverse recovery time of fast recovery diode

The definition of reverse recovery time (TR) of fast recovery diode is the time interval during which the current transitions from positive to a specified low value through zero. It is an important technical indicator for measuring the performance of high-frequency continuous current and rectifier devices. The waveform of the reverse recovery current is shown in Figure 1. 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.