International Journal of Electrical and Electronics Research ISSN 2348-6988 (online) Vol. 8, Issue 1, pp: (33-41), Month: January - March 2020, Available at: www.researchpublish.com
Flyback based three-port electroless capacitor LED drive power 1
Jiaqi Gao, 2Chunkai Chen, 3Lianlian Yang, 4Binbin Du 1,2,3,4
Electronic and Information Engineering
1,2,3,4
TianGong University, Tianjin, China
Abstract: LEDs are widely used in all walks of life due to their good performance. But its core part, the driving power, is the key to ensuring long-term stable and efficient operation of the lighting system. Therefore, solving the defects of electrolytic capacitors in LED driving power and extending the working life of LED driving power is of great significance to the development and popularization of LED lighting systems. This article uses a transformerisolated Fly-back PFC circuit and a small-capacity CBB capacitor to balance the input power. Combining dualinput and dual-output converters, a three-port converter is constructed, and three power transmission paths are realized through power transmission between three ports. When the input power is greater than the output power, the energy storage capacitor stores excess energy; conversely, the energy storage capacitor releases energy to the load circuit to balance the input power and output power. Among them, the DC / DC converter implements the PFC function, and the energy storage capacitor performs power transmission through charging and discharging, balancing the pulsating power between the input power and the output power to achieve a constant power output, thereby reducing the ripple current and achieving a flicker-free purpose. Keywords: AC/DC drive power, Fly-back converter, Buck circuit, three-port converter.
1. INTRODUCTION In recent years, people around the world have paid close attention to issues such as energy shortages and environmental pollution. Energy saving and emission reduction have become an important promotion. Lighting is an important aspect of human energy consumption. How to improve the efficiency of electric light sources effectively is of great significance in alleviating energy and environmental problems.[1] LED will gradually replace traditional light sources in the next ten years and become the new light source with the most development potential due to its excellent characteristics of environmental protection, high efficiency and energy saving.[2] However, the life of electrolytic capacitors in the traditional AC/DC LED drive power supply on the market is short, which severely limits the life of LED lamps. According to research, electrolytic capacitor failure is the most common in the failure of LED driving power. The heating effect of the light bulb causes the temperature in the driving device to be relatively high, which accelerates the volatilization of the medium inside the electrolytic capacitor, thereby reducing the life of the electrolytic capacitor. The short-lived electrolytic capacitors cause waste of LED lighting systems and increase in manufacturing costs. Therefore, solving the defects of electrolytic capacitors in LED driving power and increasing the stable working time of LED driving power are of great significance to the development and popularization of LED lighting systems.[3]
2. PROPOSED METHOD 2.1 Design ideas Optimizing the topology is mainly to select the appropriate auxiliary network for organic integration according to different PFC converters. The methods to achieve energy balance include: parallel auxiliary network topology, using integrated auxiliary network topology, adding energy storage elements such as inductors and small capacitors, etc. [6]. For example, an additional auxiliary energy storage element is used to reduce the power pulsation difference ĪE. When the input power is greater than the output power, the excess energy is stored in the energy storage inductor. When the
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