How to use fast recovery diodes in rectifier circuits?

Date:2024-09-30 Categories:Product knowledge Hits:218 From: Guangdong Youfeng Microelectronics Co., Ltd(YFW)


Fast recovery diodes are widely used in circuits. So, how to use fast recovery diodes in rectifier circuits?
Due to its low frequency, rectifier circuits only require withstand voltage. As long as the withstand voltage can be met, they can definitely be used as substitutes. Fast recovery diodes are also used for rectification in the secondary rectification part of switching power supplies,
Only fast recovery diodes can be used for rectification, otherwise the overall efficiency of the power supply will be reduced due to excessive diode losses, and in severe cases, the diodes may be burned out.
In addition, the price of fast recovery diodes is much higher than that of rectifier diodes, and the higher the withstand voltage, the more expensive it is, so it is generally not recommended to use fast recovery diodes. However, in high-frequency rectification scenarios such as power output, ordinary diodes recover when they are in a conducting state
The recovery is very slow. When the reverse voltage is rapidly applied, it is still in a conducting state. The carriers accumulated in the PN junction during forward conduction flow directly in reverse, generating a large reverse current and losing its "rectification" function. Therefore, a fast recovery diode must be used

 



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