Overview of 12v switching power supply structure
Any switching power supply, in its basic circuit structure, must include an AC input module, an anti-interference circuit structure, a rectifier filter circuit structure, a startup circuit structure, and a switching transformer, etc., and it also has a voltage-stabilizing control circuit, as well as a pulse rectifier output circuit, etc., forming a more systematic switching power supply structure.
Common faults and maintenance mechanisms of 12v switching power supplies:
1. 12v switching power supply - input link fault inspection and maintenance
In the process of centralized inspection and calibration of switching power supplies, systematic control measures and inspection and verification should be established for the corresponding problems to ensure the optimization of its operating efficiency and overall management effect. For the inspection of the input link, it is necessary to check whether there is AC input. If there is no input, it is necessary to perform a circuit breaker analysis or wear analysis on the incoming line. Focus on observing whether there is an abnormal problem with the fuse, and also systematically integrate and inspect the damaged components. For the corresponding problems, replace the components in time to ensure that the output voltage is normal.
2. 12v switching power supply - filter circuit fault inspection and repair
To analyze the output of DC voltage, if there is no DC voltage output, it is necessary to use the resistance method to test the fuse structure, check its open circuit, and deal with the corresponding problems in a centralized manner. If there is an open circuit, it should be replaced in time. In addition, the resistance method should also be used to centrally measure the filter capacitor. If it is damaged, it needs to be replaced. Only when its capacitance parameters are close to infinity can it react normally temporarily. If the parameters drop suddenly or the circuit is broken, the abnormal components need to be replaced and the diodes need to be inspected. Only when the voltage is output in a regular manner can it be said that it is operating normally.
3. 12v switching power supply - feedback circuit fault inspection and repair
In the process of centralized inspection of the feedback circuit, it is necessary to ensure that the current oscillation is normal. In the case of power failure, the filter capacitor parameters are effectively identified, the discharge operation is implemented, and the winding resistance feedback system is effectively handled by the resistance method. If the current is small, there will be no open circuit problem. In the actual operation of the switching power supply, the most common problem is the desoldering of the switching transformer feedback winding. Therefore, it is necessary to conduct centralized inspection and processing of basic components such as feedback resistors, diodes, and feedback capacitors, and conduct comprehensive maintenance and replacement for corresponding problems to ensure regular operation. It is worth mentioning that when the switching power supply uses chips, due to its high cost, its regular operation status must be centrally checked.
4. 12v switching power supply-pulse rectifier output fault inspection and repair
In the process of analyzing the pulse rectifier structure, the resistors, capacitors, and diodes must be centrally checked and calibrated to ensure their convenience and effectiveness. In addition, in terms of stable control circuits, it is a common problem that the output voltage does not meet the actual requirements, and the photoelectric coupler will have abnormal light-emitting tubes. The problem needs to be effectively estimated and processed using the resistance method to ensure that the corresponding parameters and component structures operate normally. Only by ensuring that the estimated structure is in line with reality can the overall operating efficiency of the integrated circuit be improved.
In short, in the process of in-depth research on 12v switching power supplies, it is necessary to ensure the integrity of the inspection mechanism and control measures, and to combine the actual operating efficiency and management dimensions to improve the level of routine fault inspection and maintenance, and actively implement dynamic management models. After analyzing the working principle of the switching power supply in detail, it is necessary to conduct a comprehensive observation and use resistance method, voltage method and other measures to strengthen the inspection effect to ensure the normal operation of the switching power supply and lay a solid foundation for the optimized development of electronic equipment management.