Natural properties of Schottky diodes and fast recovery diodes

Schottky diodes and fast recovery diodes are both fast diodes. In general, how do these two types of diodes work? Popularize the natural properties of Schottky diodes and fast recovery diodes.

Schottky diode is a diode made of a barrier layer formed by the contact between metal and semiconductor. Its main characteristics are small forward conduction voltage drop (about 0.45V), short reverse recovery time, and low switching loss. However, the current problem with Schottky diodes is that their voltage resistance is relatively low and their reverse leakage current is relatively large. The general level of voltage resistance for Schottky diodes used in power conversion circuits is below 150V, with an average current of below 100A and a reverse recovery time of 10-40ns.

The working principle of Schottky diodes and fast recovery diodes is the same as that of ordinary diodes, but due to the longer reverse recovery time of ordinary diodes in the switching state, about 4-5ms, they cannot meet the requirements of high-frequency switching circuits.

Fast diodes are mainly used in high-frequency rectification circuits, high-frequency switching power supplies, high-frequency impedance capacitance absorption circuits, inverter circuits, etc. Their reverse recovery time can reach 10ns.

Schottky diodes are ideal for use in high-frequency and low-voltage circuits. At present, fast recovery diodes are mainly used as rectifying components in inverter power supplies, limiting and embedding in high-frequency circuits.

From this, it can be seen that there is still a significant difference between Schottky diodes and fast recovery diodes. So in the selection process, it is still necessary to choose according to different types.