A general method for rectifier diode selection

A general method for rectifier diode selection

How to select rectifier diode in electronic circuits, and what are the general selection techniques?

   1. When selecting rectifier devices, calculate the current and voltage parameter requirements first. However, in practical applications, considering various factors such as power grid fluctuations, calculation errors, product use places, shell materials, heat dissipation materials and space, for safety considerations, rectifier devices with calculation parameters of about 1.2-2-3 times are usually selected.

   2. Considering the problem of power consumption of the rectifier device itself, in the case of the same current and voltage, the rectifier device with small VF and IR can reduce the power consumption of the device and improve efficiency.

   3. In addition, excessive Trr will also cause excessive recovery time, resulting in superimposed power consumption and delay. At the same time, the reverse recovery time directly affects the maximum operating frequency of the rectifier device, so the high-frequency rectifier device has strict requirements for Trr, resulting in the development of fast recovery rectifier diode, Schottky and other devices with smaller Trr.

   4. Therefore, the rectifier device at the input (front end) has more low frequency, the requirements for diode Trr are relatively low, and the output end (back end) has higher requirements for Trr, and fast recovery diodes or Schottky rectifier diode are mostly used, and even MOS products are used as rectifier devices.