Article 2: What is the difference between rectifier diodes and fast recovery diodes? Power circuit selection is no longer wrong

Many hardware engineers are unable to distinguish between the usage scenarios of ordinary rectifier diodes and fast recovery diodes when designing power supplies, resulting in issues such as circuit flicker, heating, tube explosion, and low efficiency. The core difference between the two lies in reverse recovery time, switching speed, and applicable frequency. diode

Ordinary rectifier diodes (1N4007, 1N5408, etc.): have a long reverse recovery time, are only suitable for 50Hz mains rectification, have extremely low cost and high voltage resistance, and are not suitable for high-frequency switching power supplies. If used in high-frequency circuits, it will cause serious switching losses, severe heating, and even burning.

Fast recovery diode: TRR has a short reverse recovery time and fast switching speed, specifically suitable for high-frequency switching power supplies, inverters, charging stations, industrial power supplies, and other mid to high frequency rectification scenarios, balancing voltage resistance and speed.

Selection Summary:

Power frequency mains rectification, low-frequency circuit → choose ordinary rectifier diode

Switching power supply, high-frequency rectification, inverter circuit → Fast recovery diode must be selected

Low voltage high-frequency fast charging, small volume equipment → Priority Schottky diode

Reasonably matching diode types is the core key to power stability, temperature rise, and efficiency, and it is also the detail that is most prone to pitfalls in mass production projects. diode