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HuiXin Electronic2017/6/9 16:31:12

Huixin gives a brief introduction of Fast Recovery Diode

  Fast Recovery Diode( FRD for short ) is a semiconductor diode with well switching feature and short reverse recovery time. It is mainly used in circuits such as switch power supply, PWM, frequency transformer, high frequency rectifier diode, freewheeling diode and damping diode. The inner structure of Fast Recovery Diode is different from the general PN junction because FRD belongs to PIN junction diode which means an extra base region “I” was added between P silicon and N silicon. Due to this thin base region, the reverse recovery charge is limited, therefore, the reverse recovery time of FRD becomes so quick that it not only reduces the TRR figure but also decreases the forward transient voltage drop, and that enables the diode to bear high reverse working voltage. The reverse recovery time of FRD is usually several hundred ns and the forward voltage drop is 0.6V. Forward current could be several Amp or several thousand Amp and the peak reverse voltage changes from several V to thousands of V. Applying the technique of gold doping and diffusion enables Fast Recovery Diode to gain fast switching speed and high degree of voltage withstanding. At present FRD is often employed as rectifying component in inverter power supply.

Huixin gives a brief introduction of Fast Recovery Diode

  When the voltage on both electrodes of the diode transforms from forward to reverse, the response time is usually short. On the contrary, when voltage transforms from reverse to forward, the response time could be long, which is called reverse recovery time. Swift reverse recovery time is demanded if the diodes are used for high frequency rectifying. At this moment, A Fast Recovery Diode, or the swifter Superfast Recovery Diode is needed. The most swift diode at reverse recovery responsing is Schottky Barrier Diode but its technical theory is different from the diodes that mentioned above.

  Fast Recovery Diode has low forward voltage drop but high reverse breakdown voltage. As for the package, the most common type 5-20A Fast Recovery Diodes are packaged in TO-220FP, large power FRDs that are over 20A are manufactured in plastic TO-3P with metal cooling pin on top of it, while those that are below 5A are produced in plastic DO-41, DO-15 or DO-27.

Huixin gives a brief introduction of Fast Recovery Diode

  Generally speaking, Fast Recovery Diode would be preferred in high frequency rectifying or freewheeling circuit. As for the output of power supply, considering the rather low frequency, the FRD is needless and general diode is accepted.


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