Article Details

Title · Authors · Abstract · Keywords · DOI · References

Design of an 18 W Universal-Input Flyback Switching Power Supply

TAN Minghong1, CHEN Hao2, ZHANG Wei1,3, HU Lang2

(1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China; 2. Jihua Laboratory, Foshan 528255, China; 3. School of Electronics and Electrical Engineering, Zhaoqing University, Zhaoqing 526061, China)

Section：Electronic Engineering · Vol. 2026, Issue 18 · Pages：40-44,52 · 2096-4706（2026）18-0040-06 · CLC number：TM46；TP303 · Document code：A · DOI：10.19850/j.cnki.2096-4706.2026.18.008

Abstract

To meet the demand for global mains compatibility of low-power isolated switching power supplies, this paper designs a flyback switching power supply with a wide input range from 90 V to 264 V AC and an output of 12 V DC/1.5 A. On the basis of a conventional design, a DC bus voltage calculation method constrained by the input capacitor is introduced, and the full design flow from magnetic core selection to winding parameter determination is completed. A physical prototype is then fabricated and tested. The test results show that the designed power supply operates stably over the full input voltage range, with high output accuracy, low ripple, and satisfactory efficiency, achieving a full-load efficiency above 86%. It provides a useful reference for the development of similar low-power, wide-input-voltage flyback power supplies.

Keywords

Flyback converter; wide input voltage; switching power supply; DCM

References

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Funding

2024 Guangdong Province Joint Training Graduate Demonstration Base (202488); Shenzhen Hengyunchang Vacuum Technology Co., Ltd. Technology Development Project (202425)

About the authors

Tan Minghong (1999-), male, Han ethnicity, from Zhongshan, Guangdong, master's student, research interests include power electronics technology; Chen Hao (1992-), male, Han ethnicity, from Guangzhou, Guangdong, senior engineer, master's student, research interests include power electronics technology; Corresponding author: Zhang Wei (1968-), male, Han ethnicity, from Wuhan, Hubei, professor, master's supervisor, doctoral student, research interests include optoelectronic devices; Hu Lang (1965-), male, Han ethnicity, researcher, doctoral student, research interests include power electronics technology.