What is the difference between a fast recovery diode and a normal diode?

What is the difference between a fast recovery diode and a normal diode?

fast recovery diode: the forward voltage drop is higher than that of ordinary diodes (0.5-2V), and the reverse withstand voltage is mostly below 1200V.

Ordinary diode: It has a forward voltage drop (0.4--1.0V), a very short reverse recovery time (2-10ns nanoseconds), a large reverse leakage current, and a low withstand voltage, generally lower than 150V, and is mostly used in low-voltage occasions.

fast recovery diode:

       fast recovery diode (FRD) is a kind of semiconductor diode with good switching characteristics and short reverse recovery time, which is mainly used in electronic circuits such as switching power supplies, PWM pulse width modulators, and frequency converters, as high-frequency integers

Flow diodes, freewheeling diodes, or damping diodes are used. The internal structure of the fast recovery diode is different from that of the ordinary PN junction diode, which belongs to the PIN junction diode, that is, the base region I is added between the P-type silicon material and the N-type silicon material to form a PIN silicon wafer. Because the base region is thin and the reverse recovery charge is small, the fast recovery diode has a short reverse recovery time, a low forward voltage drop, and a high reverse breakdown voltage (withstand voltage value).

A diode is a device with two electrodes among electronic components that allows current to flow in only one direction, and many are used to rectify the current flow. Varactor diodes (VAFIC diodes) are used as electronic tunable capacitors. The current directivity of most diodes is often referred to as "rectifying". The most common function of a diode is to allow only current to pass through a single direction (known as forward bias) and to block it in reverse direction (known as reverse bias).