source:power adapter Popular:adapter release time:2021-06-25 09:35:17 Article author:sznbone
There is a certain relationship between the service life of the power adapter and the components. Only when the service life of all components reach the specified service life can the ultimate service life of the power supply be guaranteed. So what are the key components in the power adapter that are particularly important? Let's follow the power adapter manufacturers to learn about it!
1. Electrolytic capacitor
The electrolytic capacitor is a temperature-sensitive device in the power adapter device. From this perspective, the quality of the electrolytic capacitor 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. Primary switch tube (MOS tube)
This type of switching device is in a high-speed switching state, and the voltage stress and current stress are high. The heat caused by the switching loss will also accelerate the aging of the device, and it is also susceptible to breakdown and damage due to external high voltage interference.
3. High frequency power transformer
During the energy transmission of high frequency transformer, internal loss will cause it to generate heat, and the heat emitted will also affect the life of the transformer material. Common transformer faults include insulation breakdown, winding burnout, and copper wire breakage.
4. Multilayer ceramic capacitors
SMD ceramic capacitors are prone to problems in the solder joints of the capacitors, which may crack due to some stress. In order to minimize the possibility of occurrence, it is recommended to avoid the parallel use of multiple ceramic capacitors.
5. Output rectifier diode
Diodes are mainly subjected to two major electrical stresses, including reverse withstand voltage and forward current. At the same time, diodes are also heating devices. In order to ensure the service life of this device, we will flow out enough margin during the design, and ultimately ensure the batch performance of the power adapter.
6. Photocoupler
The current transfer ratio (CTR) will gradually decrease over time. In order to keep the loop stable, the current of the light-emitting diode will continue to increase and eventually reach its limit value, causing damage to the optocoupler.
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