With the rapid development of the telecommunications industry, the overall scale of telecommunications networks continues to expand, and the network structure is becoming increasingly complex and advanced. As a communication support system, the market demand for basic power supply systems for communications is increasing year by year, and the importance of its power source is becoming increasingly prominent. The efficient, safe, and orderly normal operation of the huge telecommunications network has put forward increasingly stringent requirements on the quality of the communication power supply system, and has promoted the development of communication power supply towards high efficiency, high frequency, modularization, and digitalization. Based on a broad understanding of the industry status and research hotspots of communication power supplies, this paper deeply studies the basic principles and related technologies of switching power supplies, focusing on the analysis of the basic principles of switching power supply power factor technology and phase-shifted full-bridge soft switching PWM technology, and on this basis, designs a 48V/25A communication power supply module commonly used in communication rooms. The power supply module consists of two-stage circuits of power factor correction and DC/DC conversion, and uses some of the latest technologies to improve the performance of the power supply. For example, soft switching technology is introduced in the circuit topology, and the zero voltage turn-on of the switch tube is realized by using a phase-shifted full-bridge soft-switching PWM converter, which reduces the power device loss and improves the power supply efficiency; a high-performance DSP chip is used to realize digital PWM control of the power supply, which overcomes the defects of general single-chip controllers that cannot produce PWM outputs with high enough frequency and precision and cannot complete single-cycle control due to limited operating frequency; intelligent control technology is introduced to replace the traditional PID algorithm with a fuzzy adaptive PID control algorithm, which improves the dynamic performance of the switching power supply. The whole paper takes power supply design as the main line, and on the basis of a detailed analysis of the circuit principle, the main circuit parameter design, auxiliary circuit design, control loop design, simulation research, and software implementation of the system are carried out.
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