The characteristics of adjustable switching power supply and the influence of components on the life of the power supply
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Adjustable switching power supply is an electronic instrument and equipment that converts power frequency power grid energy into a special form of high-voltage power supply. The life of the adjustable switching power supply and the components used meet the barrel effect, so the key components have a greater impact on it.
The aging of the transformer leads to the failure of the adjustable switching power supply
After the primary winding of the transformer is energized, the magnetic flux tested by the coil flows in the core. The core itself is a conductor, and an induced potential will be generated on the plane perpendicular to the magnetic field line. A closed loop is formed on the cross section of the core and a current is generated. vortex". This eddy current will increase the loss of the transformer and cause the core of the transformer to heat up. In addition, there is also resistance in the copper wire used for winding the transformer. When the current passes, a certain amount of power will be consumed. This part of the loss will become heat, resulting in a comprehensive increase in the temperature of the transformer during operation. As the temperature of the transformer rises, the coil will inevitably age. When the ageing deteriorates the insulation performance, it will weaken the impact resistance of the mains. It is extremely easy for the transformer to be broken down and the adjustable switching power supply to fail. Therefore, the selection of transformer components is crucial. 
Adjustable switching power supply transformer
Other components that have a greater impact on the life of the adjustable switching power supply
1. Electrolytic capacitor: electrolytic capacitor is also one of the more sensitive components to temperature;
2. MOS tube: The MOS tube is in a high-speed switching state, and the voltage stress and current stress are relatively high. The heat caused by its loss will also lead to accelerated aging of the MOS tube. At the same time, when the external high-voltage interference is large, the MOS tube is easily broken down. ;
3. Diode: The diode mainly bears two major electrical stresses, including reverse withstand voltage and forward current; 
Internal components of an adjustable switching power supply
The improvement of the life cycle of adjustable switching power supplies, in addition to the control of research and development and production, also need to pay attention to in the actual use of power supplies, such as operating temperature, humidity, etc., not elaborated here.
The advantages and disadvantages of adjustable switching power supply and linear power supply
1. Adjustable switching power supply
1. Advantages of adjustable switching power supply
1) Small size and light weight
2) High conversion efficiency, generally above 85%
3) Wide voltage input range and compatible with AC and DC input
4) The output voltage is continuously adjustable, easy to operate, and has a wider application range
2. Disadvantages of adjustable switching power supply
1) Higher output ripple voltage
2) The circuit is relatively complex and the cost is high 
Mesh shell type adjustable switching power supply
Second, linear power supply
1. Advantages of linear power supply
1) No high-frequency noise interference
2) Lower ripple voltage
3) Simple circuit structure, high reliability and easy maintenance
2. Disadvantages of linear power supply
1) It is bulky and difficult to transport and carry (same power, linear power supply is generally greater than or equal to 5 adjustable switching power supplies)
2) Higher conversion efficiency and serious loss
3) Adjustable switching power supply with limited voltage input range http: //
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Adjustable switching power supply ** http: // 