How are fast recovery diodes used in rectifier circuits?

 How are fast recovery diodes used in rectifier circuits?

fast recovery diodes are widely used in circuits, so how are fast recovery diodes used in rectifier circuits?

The rectifier circuit is very low frequency, so it only has requirements for the withstand voltage, as long as the withstand voltage can be satisfied, it must be replaced, and the fast recovery diode is also used for rectification, that is, in the secondary rectification part of the switching power supply, due to the high frequency,

Only the fast recovery diode can be used for rectification, otherwise the overall efficiency of the power supply will be reduced due to too much diode loss, and the diode will be burned in serious cases.

In addition, the price of the fast recovery diodes is much more expensive than the rectifier diode, and the higher the withstand voltage, the more expensive it is, so it is generally not used for the fast recovery diode. However, in the case of high-frequency rectification such as power output, the ordinary diode recovers in the conduction state

The complex is very slow, when the reverse voltage is rapidly added to it is still in the conduction state, the positive conduction in the PN junction accumulated carriers directly reverse phase flow, will produce a large reverse current, lose the "rectification" function, so it is necessary to use a fast recovery diodes.