What are the functions of fast recovery diodes in circuits?

What are the functions of fast recovery diodes in circuits?

The fast recovery diodes belongs to the high-frequency rectifier diode in the rectifier diode, and the reason why it is called the fast recovery diodes is because the ordinary rectifier diode generally works at low frequency (such as the mains frequency is 50Hz), and its working frequency is lower than 3kHz.

A rectifier diode is a semiconductor device used to convert alternating current into direct current. The most important characteristic of diodes is their unidirectional conductivity. In a circuit, current can only flow in from the positive pole of the diode and out from the negative pole. Usually it contains a PN junction with two terminals, a positive and a negative. The carriers in the P region are holes, and the carriers in the N region are electrons, forming a certain barrier between the P region and the N region. When the P region is positive relative to the N region, the potential barrier is lowered

Stored carriers are generated near both sides of the barrier and can pass high currents with a low voltage drop (typically 0.7V), which is called the forward conduction state. If the opposite voltage is added, then the barrier increases, and it can withstand a high reverse voltage, and a very small reverse current (called reverse leakage current) flows, which is called the reverse blocking state. The rectifier diode has obvious unidirectional conductivity, so that the fast recovery diode can achieve high-frequency rectification.