How to solve the problem that the switching power supply fails?

      In general, a blown fuse indicates a problem with the internal wiring of the power supply. Due to the high voltage and high current of the power supply, the fluctuations and surges of the power grid will cause the current in the power supply to increase instantaneously and the fuse will be blown. The key points should be to check the rectifier diode of the power input terminal, high-voltage filter electrolytic capacitor, inverter power switch tube, etc., check whether these components have breakdown, open circuit, damage, etc.

      When a circuit fails or is abnormal, the current is constantly rising, and the increased current may damage some important devices or valuable devices in the circuit, and may also burn the circuit or even cause a fire. If the fuse is correctly placed in the circuit, then the fuse will cut off the current when the current abnormally rises to a certain height and a certain time, thereby protecting the safe operation of the circuit.

      Therefore, each fuse has a rated specification, and the fuse will blow when the current exceeds the rated specification. When a current between the conventional non-fuse current and the rated breaking capacity specified by the relevant standard acts on the fuse, the fuse should be able to operate satisfactorily without jeopardizing the surrounding environment. The expected fault current of the circuit in which the fuse is placed must be less than the rated breaking capacity current specified by the standard. Otherwise, continuous arcing, ignition, fuse burning, melting together with the contact, unidentifiable fuse mark, etc. may occur when the fuse is blown. phenomenon. Of course, the breaking capacity of inferior fuses does not meet the requirements of the standard, and the hazards will also occur when used.