What’s the function of ultrafast recovery diode?

What’s the function of ultrafast recovery diode?

   With the development of electronic components, diodes are also one of them. ultrafast recovery diode (fred for short) are semiconductor diodes with good switching characteristics and ultra-short reverse recovery time. They are often used as switches for high-frequency inverter devices. The devices are used as freewheeling, absorbing, clamping, isolating, output and input rectifiers, so that the functions of switching devices can be fully utilized.

     It is mainly used in electronic circuits such as switching power supplies, PWM pulse width modulators, and frequency converters, as high-frequency rectifier diodes, freewheeling diodes, or damping diodes. The fast recovery diode adopts gold-doped, simple diffusion and other processes in the manufacturing process, which can obtain high switching speed and high withstand voltage at the same time. At present, fast recovery diodes are mainly used as rectifying elements in inverter power supplies.

     With the development of power electronics technology in the direction of high frequency and modularization, in-line ultra-fast recovery as a high-frequency device has also been vigorously developed, and has been widely used in various high-frequency inverter devices and chopper speed control devices. , Play the role of high-frequency rectification, freewheeling, absorption, isolation and clamping, which is very important for the development of my country's high-frequency inverter welding machine, high-frequency switching electroplating power supply, high-frequency high-efficiency switching power supply, high-frequency fast charging power supply, high-frequency Frequency conversion devices and power factor correction devices will play a role in promoting.

     High-frequency inverter devices that are highly efficient, energy-saving, power-saving and material-saving, and can improve product quality and labor productivity will gradually replace thyristor power frequency power supplies that are currently being mass-produced, bulky, low-efficiency, and seriously pollute the grid. The replacement cycle of my country's power electronic products will play a decisive role.

     When choosing a fast recovery diode, first consider the matching between the frequency of the project position and the recovery time of the device, and then select the withstand voltage device model with a peak voltage that is more than 30% more, and finally consider that the forward voltage drop value of the corresponding position current of the project is within the appropriate range of matching.

     Fast recovery diode package almost covers the whole series of in-line and SMD: TO-220AB (iron seal), ITO-220AB (plastic seal), TO-247, DO-41, DO-15, DO-27, R-6 , Chip: SMA, SMB, SMC, SMAF, SMBF, SOD123FL, TO-277, TO-252, TO-263 and other packages.