Precautions for selecting a switching power supply-Shenzhen Xinlixun Technology Co., Ltd.

Precautions for selecting a switching power supply

2023-11-17

1. When selecting a switching power supply, precautions should be taken: 1) Select appropriate input voltage specifications; 2) Choose the appropriate power. In order to increase the lifespan of the power supply, a model with an additional 30% output power rating can be selected. 3) Consider load characteristics. If the load is a motor, light bulb, or capacitive load, and the current is high at the moment of starting, a suitable power source should be selected to avoid overload. If the load is a motor, voltage reversal during shutdown should be considered. 4) In addition, it is necessary to consider the working environment temperature of the power supply and the presence of additional auxiliary cooling equipment. In case of excessively high ambient temperature, the power supply needs to be derated for output. The derating curve of environmental temperature on output power. 5) Select various functions according to the application requirements: protection functions: overvoltage protection (OVP), overvoltage protection (OTP), overload protection (OLP), etc. Application functions: signal function (normal power supply, power supply failure), remote control function, telemetry function, parallel function, etc. Special functions: Power Factor Correction (PFC), No Power Cut (UPS) 6) Select the required safety regulations and electromagnetic compatibility (EMC) certification. 2. Precautions for using a switching power supply: 1) Before using the power supply, first determine whether the input and output voltage specifications match the nominal value of the power supply used; 2) Before powering on, check whether the input and output leads are connected correctly to avoid damaging the user\'s equipment; 3) Check whether the installation is secure, whether there is contact between the installation screws and the power board components, and measure the insulation resistance between the shell and the input and output to avoid electric shock; 4) To ensure the safety of use and reduce interference, please ensure that the grounding terminal is reliably grounded; 5) The power supply with multiple outputs is generally divided into main and auxiliary outputs, and the main output characteristics are better than the auxiliary output. Generally, the main output is the power supply with high output current. To ensure the output load adjustment rate and output dynamics, it is generally required to carry at least 10% of the load on each circuit. If the auxiliary road is used instead of the main road, the main road must be equipped with appropriate false loads. Please refer to the specifications of the corresponding model for details; 6) Please note that frequent switching of the power supply will affect its lifespan; 7) The working environment and load level can also affect its lifespan.

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