Research and design of a green mode switching power supply - News - Global IC Trade Starts Here.

Full range of MOS power ICs

Domestic switch needle KG-300K with a needle head diameter of 3.0mm, normally open switch needle

0805 green, 0805 emerald green

L0504-Murata common mode inductor, 90Ω impedance, 150mA

Abstract: This paper proposes a design for a low-power green-mode switching power supply. The power supply employs a two-stage converter to shape the input current waveform and rapidly adjust the output voltage. Advanced power control technologies such as transition mode active power factor correction, quasi-resonant variable frequency control for power isolation conversion, and synchronous rectification are utilized to minimize the overall power loss of the supply, enhance system efficiency, and reduce harmonic pollution. Test results demonstrate that the switching power supply achieves the goals of green design and meets the demands of high-performance applications.
Keywords: green mode; power factor correction; switchboard power consumption; system efficiency

0 Introduction Medium and small power switching power supplies are extensively used in various electronic products such as measurement and control instruments, communication equipment, educational tools, and entertainment devices due to their superior performance. As environmental and energy concerns grow increasingly significant, there is heightened public demand for environmentally friendly electronic products, particularly those with low power consumption and high efficiency. Designing a green-mode power supply that is pollution-free, consumes minimal energy, and operates efficiently has become a focal point in switching power supply technology research.
This paper explores a medium and small power switching power supply, applying advanced power control technologies like transition mode active power factor correction, quasi-resonant variable frequency power isolation conversion control, and synchronous rectification to achieve the goal of designing a green switching power supply.

1 System Structure and Working Principle The switching power supply structure under study, as depicted in Figure 1, features a two-stage PFC (Power Factor Correction) architecture. It consists of a DC/DC converter comprising a PFC pre-converter, an isolated converter, and a synchronous rectification circuit, along with a detection and protection circuit. After the AC voltage is rectified, it is fed into the PFC pre-converter for power factor correction conversion. Subsequently, the power supply control circuit manages the isolated converter to transform the DC voltage into a high-frequency AC pulse voltage. The pulse voltage is then rectified by a synchronous rectifier and filtered by a filter circuit to produce the desired DC output.
[3][4]