source:power adapter Popular:adapter release time:2021-09-02 09:16:52 Article author:sznbone
The life of the power adapter is as unpredictable as human beings, but many large data analysis reports have the concept of life expectancy. The same is true for power supply. There are many factors that affect its life, so the life of a general power supply is measured by the mean time between failures.
Between the service life of the direct power adapter and the use of components, the bucket effect is also satisfied. All devices have a specific service life to ensure the ultimate service life of the power supply. Generally speaking, key devices are subject to greater electrical stress, high heat is generated, and the internal temperature of the machine rises rapidly, and the temperature has a greater impact on the life of the device. Therefore, the final assessment of the life of the equipment is particularly important. So, which key components in our power adapter need special attention?
1. Electrolytic capacitor
The electrolytic capacitor is a temperature sensitive device in the power adapter device. From this perspective, the quality of electrolytic capacitors also determines the life of the power supply device to a certain extent, and the performance of AC-DC power adapter products is outstanding.
2. Main switch (MOS tube)
This kind of switching device is in a high-speed switching state and is affected by high-voltage stress and current stress. The heat caused by the switching loss will also accelerate the aging of the device, and it is also vulnerable to breakdown damage caused by external high-voltage interference.
3. High frequency power transformer
In the energy transmission process of high frequency transformer, internal loss will cause it to generate heat, and the heat generated will also affect the service life of the transformer material. Common faults of transformers include insulation breakdown, winding burnout, and copper wire breakage.
4. Multilayer ceramic capacitors
The capacitance of local SMD ceramic capacitors is prone to solder joint problems, which may be due to some stress and cracks. In order to minimize the possibility of occurrence, it is recommended to avoid using multiple ceramic capacitors in parallel.
5. Output rectifier diode
Diodes are mainly subjected to two main electrical stresses, including reverse voltage resistance and forward current, and diodes are also heating devices. In order to ensure the service life of the equipment, we will flow out enough margin in the design, and finally ensure the batch performance of the power adapter.
6. Photocoupler
As time goes by, the current transfer ratio (CTR) gradually decreases. In order to maintain the stability of the loop, the current of the LED will continue to increase and eventually reach the limit value, causing damage to the optical coupling.
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