Generally, there are about two reasons for the crash of the power supply during use. The first may be the overload protection caused by the instantaneous overload of the load. It is recommended to increase the output power of the power supply or modify the overload design; the second is that the temperature rise is too high, and the over-temperature protection occurs. phenomenon. All of these situations will cause the power supply to crash due to entering the protection state, and the power supply will resume normal after the situation is removed.

Matters needing attention when choosing switching power supply

Select the appropriate input voltage specification;
Choose the right power. In order to increase the life of the power supply, a model with a 30% more output power rating can be selected.
Consider the load characteristics. If the load is a motor, a light bulb or a capacitive load, and the current is large at the moment of power-on, a suitable power supply should be selected to avoid overload. If the load is a motor, the voltage backflow should be considered when stopping.
In addition, the working environment temperature of the power supply needs to be considered, and whether there is additional auxiliary heat dissipation equipment, and the output of the power supply with excessively high ambient temperature needs to be derated. The derating curve of ambient temperature versus output power.
Select the required safety regulations and electromagnetic compatibility (EMC) certification.
Choose various functions according to application requirements:
Protection function: over voltage protection (OVP), over temperature 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), uninterrupted power (UPS)

Precautions for using switching power supply

Before using the power supply, first determine whether the input and output voltage specifications are consistent with the nominal value of the power supply used;
Before powering on, check whether the input and output leads are connected correctly to avoid damage to the user equipment;
Check whether the installation is firm, whether the mounting screws are in contact with the power board components, and measure the insulation resistance between the casing and the input and output to avoid electric shock;
In order to ensure the safety of use and reduce interference, please ensure that the grounding terminal is reliably grounded;
Multi-output power supplies are generally divided into main output and auxiliary output. The main output characteristics are better than the auxiliary output. In general, the main output is the main output with large output current. In order to ensure the output load adjustment rate and output dynamics and other indicators, it is generally required that each channel carry at least 10% load. If the auxiliary road is used instead of the main road, the main road must be added with appropriate dummy load. For details, please refer to the specifications of the corresponding model;
Please note: Frequent switching of the power supply will affect its life;
The working environment and the degree of loading will also affect its life.