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A switching power supply is a widely used type of power supply that converts electrical energy from the grid to provide a steady, reliable supply of power to electronic devices and electrical circuits. This article will introduce the basic structure and function of switching power supply, as well as how to use and maintain switching power supply. The basic structure of a switching power supply usually includes components such as a transformer, a rectifier circuit, a filter circuit, a voltage stabilizing circuit, and a protection circuit. The rectifier circuit is responsible for converting the AC input from the grid into DC, and the filter circuit is used to reduce current fluctuations and ripples, thereby ensuring the stability of the power output. The voltage regulator circuit can ensure the accuracy and stability of the output voltage, while the protection circuit can prevent abnormal conditions such as short circuit, overload and overvoltage of the power supply. The first step in using a switching power supply is to properly connect the input and output ports. The input port is usually connected to the grid, while the output port is connected to electronic equipment and electrical lines. During the connection process, it is necessary to pay attention to the matching of voltage and current, as well as the polarity direction of the output port. When turning on and off the switching power supply, it is necessary to follow the operation steps in the manual. When the power supply starts, it needs to warm up for a few seconds, and then check whether the output voltage and current meet the requirements. If not, you need to adjust or check whether the connection is correct. When turning off the power, you need to turn off the electronic equipment and electrical circuits of the output port first, and then follow the steps in the manual to turn off the operation. At the same time, it is also very important to maintain the switching power supply. For each switching power supply in use, it needs to be cleaned, maintained and inspected regularly. Especially in harsh operating environments, it is also necessary to replace filters and radiators, which are susceptible to contamination and wear, in a timely manner. In summary, switching power supplies are a powerful type of power supply. During use, attention should be paid to the correct connection and operation steps to ensure the accuracy and stability of the output voltage and current. At the same time, regular maintenance and inspection can also ensure the normal operation of the power supply and prolong its service life.