The service life of power adapter mainly depends on the service life of electronic components. As long as one component is broken, it will affect the normal use of power adapter.
1. chip IC
There is no core component in the power supply of the chip. It is recommended to select a first-line brand to ensure that the performance, process and cost are balanced. We generally choose to use AC-DC power adapter chips made by Ambo, silige and simfriend
2. electrolytic capacitor
Electrolytic capacitors are temperature sensitive devices in power adapter devices. From this point of view, the quality of electrolytic capacitors also determines the service life of power supply devices to a certain extent. AC-DC power adapter products are outstanding
3. primary switch tube (MOS tube)
This kind of switching device is in high-speed switching state and is subject to high voltage stress and current stress The heating caused by switching loss will also accelerate the aging of the device, and it is also vulnerable to external high voltage interference and breakdown damage
4. high frequency power transformer
During the energy transmission of high frequency transformer, the internal loss will lead to its heating, and the heat emitted will also affect the service life of transformer materials Common transformer faults include insulation breakdown, winding burnout, copper wire breakage, etc
5. multilayer ceramic capacitor
The solder joint of the chip ceramic capacitor is prone to problems, which may crack due to some stress In order to minimize the possibility of occurrence, it is recommended to avoid using multiple ceramic capacitors in parallel
6. output rectifier diode
The diode mainly bears two major electrical stresses, including reverse withstand voltage and forward current. At the same time, the diode is also a heating device In order to ensure the service life of this device, we will make enough allowance in the design to finally ensure the batch performance of the power adapter
7. Optocoupler
The current transfer ratio (CTR) will gradually decrease with the passage of time. In order to maintain the stability of the loop, the current of the LED will continue to increase and eventually reach its limit value, resulting in damage to the optocoupler
In the selection of power adapters for electronic products, it is also necessary to consider the actual use environment and the electrical requirements for them to select appropriate power adapters. For industrial products, due to the harsh use environment and long service time, it may sometimes work 24 hours a day, so it is necessary to select a large margin to meet their needs Generally, for the optional power supply, 10-15% or even more will be reserved for the overall power, while for industrial products, it will be greater than this value It is similar to that a horse can pull a thousand kilograms, but if it is a long distance, it will pull a little less to ensure that the horse will not die of fatigue Therefore, whether it is an aircraft, automobile or ship, it is a truth that the engine with greater than the maximum horsepower will be selected when it is selected
The use and maintenance of the power adapter is also one of the factors that affect its service life. We should not cover the power adapter with sundries, but ensure its heat dissipation and cooling. We should not put the power adapter in a humid or even water environment. As we all know, electronic products are taboo about water, and the power adapter is no exception. Of course, the overall waterproof is done, which is another matter
The value of power adapter lies not only in itself, but also in the process level and design level to ensure batch quality For service life, the overall designer of the product shall reasonably select the power adapter, and the user shall maintain the service process It is also one of the factors to ensure the longest service life of the power adapter What consumers need is the safety, reliability and long service life of the power adapter, so as to reduce the production and maintenance costs of the product
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