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The industrial control equipment switching power supply is one of a series of Chengliang power supplies, and its advantages are outstanding and widely used. Industrial control equipment switching power supply life and the use of components to meet the barrel effect, so the impact of key components on it is more significant.

After the primary winding of the transformer is energized, the magnetic flux tested by the coil flows in the core, and the core itself is a conductor, and an induced potential is generated on a plane perpendicular to the magnetic line, forming a closed loop on the cross section of the core and generating a current, called " vortex". This eddy current will increase the transformer wear and heat the core of the transformer. In addition, there is also a resistance to the copper wire used in the winding transformer. When the current passes, a certain amount of power is consumed, and this part of the loss becomes heat, which causes the temperature of the transformer to rise during operation. As the temperature of the transformer rises, the coil will inevitably age. When the aging to the insulation performance is reduced, the impact resistance against the mains is weakened, and the transformer is easily broken down, and the switching power supply of the industrial control equipment fails. Therefore, the selection of transformer components is crucial.

Other components that have a major impact on power life:

1. Electrolytic capacitor: Electrolytic capacitor is also one of the components sensitive to temperature;

2, MOS tube: MOS tube is in high-speed switching state, the voltage stress and current stress are high, the heat caused by the loss will also lead to accelerated aging of the MOS tube, and 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. The life cycle of the switching power supply is improved. In addition to controlling the R&D and production, it is also necessary to pay attention to the actual use of the power supply, such as work. Temperature, humidity, etc., are not explained here.

Industrial control equipment switching power supply advantages: 1) small size, light weight 2) high conversion efficiency, generally above 85% 3) wide voltage input range, and compatible with AC and DC input 4) continuous adjustable output voltage, easy to operate, suitable for a wider range

Industrial control equipment switching power supply disadvantages: 1) high output ripple voltage 2) relatively complex circuit, high cost

Linear power supply advantages: 1) no high frequency noise interference 2) lower ripple voltage 3) simple circuit structure, high reliability, easy maintenance

Disadvantages of linear power supply: 1) bulky, difficult to transport and handle) 2) high conversion efficiency, serious loss 3) limited voltage input range