This article explains three common problems of rectifier diodes

“Common problem of rectifier diodes: What should I do if the fast recovery rectifier diode is too hot?

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Common problem of rectifier diodes: What should I do if the fast recovery rectifier diode is too hot?

Answer: The fast recovery rectifier diode is very hot, even if you replace the faster recovery rectifier diode with a higher power, it is still very hot. In this case, it is recommended that you use an ultra-fast recovery rectifier diode, because the current signal frequency is higher, and the current is Effective value, there may be high frequency components in the signal, and the current peak value is far more than the 2A you measured. This will cause the diode peak power to be extremely high, and the fast recovery rectifier diode cannot keep up, so the fast recovery rectifier diode tube will become very difficult. hot.

Common problem of rectifier diode 2: How to calculate the power consumption of rectifier diode?

Answer: It is not very meaningful to calculate the power consumption of a rectifier diode. It is recommended that you consult the relevant specifications and pay attention to the key parameters of inrush current and average current, because the voltage across the large electrolysis is 0 at the moment of power-on, and the diode or bridge can be passed at this time. The current is extremely large. It is necessary to pay attention to whether it is within the allowable range in the specification, and when it is working normally, when the diode or bridge heats up, the allowable average current will drop. This is the same in the specification. . Of course, the DIYER has a large margin when selecting bridges, and there is generally no problem. Therefore, there is a key parameter of inrush current and average current that is very important;

Common questions about rectifier diodes 3: What are the common parameters of rectifier diodes?

Answer: The commonly used parameters of rectifier diodes include: maximum average rectified current IF, maximum reverse working voltage VR, maximum reverse current IR, breakdown voltage VR, maximum working frequency fm, reverse recovery time tre, zero-bias capacitor CO7 Parameters. It is worth noting that due to the limitation of the manufacturing process, even the same type of diode has a large dispersion of its parameters.