What is a fast recovery diode? The basic structure, characteristics, principles, applications, installation, fault analysis, and development history of fast recovery diodes 2

3、 Principle:

The working principle of fast recovery diodes is similar to that of ordinary pn junction diodes. Under forward bias conditions, the p-type side is connected to the positive electrode and the n-type side is connected to the negative electrode, narrowing the depletion region and allowing current to flow through the pn junction. Under reverse bias conditions, the depletion region widens and the current is blocked. The key characteristic of a fast recovery diodes is its ability to quickly stop current flow after reverse bias. When the voltage polarity suddenly changes, the minority carriers stored in the pn junction need to be cleared in order to cut off the current. Fast recovery diodes accelerate this process through optimized design, achieving the goal of quickly recovering to the cutoff state.

4、 Application:

Fast recovery diodes are widely used in various electronic and power electronic devices due to their fast switching characteristics:

1. Switching power supply: As a rectifier device in power converters, it provides efficient energy conversion.

2. Inverter: Used in solar inverters and other types of inverters to convert direct current into alternating current.

3. Motor control: Used in motor drive circuits to achieve precise motor speed and torque control.

4. Welding machine: As the main rectifier component in welding machines, it provides stable DC output.

5. Communication equipment: Used in power management of RF power amplifiers to ensure clear signal transmission.

6. Vehicle charger: Used for efficient energy management and conversion in electric vehicle chargers.diodes