Design of Switching Power Supply based on UC3842

Based on UC3842 chip and using flyback topology, this paper designs a switching power supply. When the input voltage fluctuates, the power supply can regulate itself to provide stable and high-quality DC output voltage. This paper briefly introduces the working principle of switching power supply, analyzes the design of switching power supply with flyback topology junction, models and simulates it, and tests it to verify whether its actual performance is consistent with the design goal. Experiments show that the switching power supply designed in this paper has stable output voltage, high voltage regulation rate, meets the safety regulations, and has good practical value. Because the design in this paper focuses on Safety specifications and balanced consideration in all aspects, the efficiency of power supply in the actual test results is low, which is the deficiency of this design. It is expected to make a breakthrough in this aspect in the future.