Abstract
At present, due to the small size, high power density, high efficiency, a variety of switching power supply is getting more and more widely used. With the improvement of automation degree of power system, especially the microcomputer of protection device, the program control of communication device and the requirement of power efficiency are also increasing. In order to solve the problem of high power consumption and unstable output of linear circuit in the process of energy conversion, this paper proposes a stable switching power supply based on SG3525 control. The constant voltage source USES PWM control principle to control the duty ratio of the switch tube to achieve the output voltage of 24V. Since the switch power supply design is usually based on the ideal state of the device, SABER simulation software is used to verify the feasibility of the circuit. At the same time, through physical verification, the circuit performance when the input voltage fluctuates. And test the load capacity and work efficiency of the circuit.
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