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Analysis of the causes of rectifier diode damage

A rectifier diode is a semiconductor device used to convert alternating current to direct current, which has significant unidirectional conductivity and can be made from materials such as semiconductor germanium or silicon. So in general, what are the causes of rectifier diode damage?

rectifier diode damage cause analysis:

1. Insufficient lightning protection and overvoltage protection

Even with lightning protection and overvoltage protection devices, rectifier diode can be damaged by lightning strikes or overvoltage if they work unreliably.

2. Harsh operating conditions

In an indirect operation generator set, the generator runs at high speed for a long time due to incorrect calculation of the speed ratio, or the diameter ratio of the two pulleys does not meet the speed ratio requirements. In addition, the rectifier works at a higher voltage for a long time, accelerating aging and causing breakdown.

3. Poor management

The operator is not responsible and does not understand the changes in the external load (especially between midnight and 6 am the next morning). or external load failure, operator or failure to take timely measures. These can lead to overvoltage, where therectifier diode can break down and be damaged.

4. Poor installation or manufacturing

Since the generator set operates under high vibration for a long time, the rectifier diode is also under this interference. In addition, the operating speed of the generator set is not uniform, so the operating voltage of the rectifier diode also fluctuates. This greatly accelerates the aging and damage of the rectifier diode.

5. The diode specification and model are inappropriate

If the replaced rectifier diode does not meet the required parameters, or if the wiring is wrong, the rectifier diode will break down and damage.

6. The safety margin is too small

The overvoltage and overcurrent safety margin of rectifier diode is too small to withstand spikes in the excitation circuit.