Increasing Efficiency and Power Factor for Power Supplies Using Parallel Flyback Converter
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ORIGINAL ARTICLE
Increasing Efficiency and Power Factor for Power Supplies Using Parallel Flyback Converter Tamer F. Megahed1,2 Received: 11 May 2020 / Revised: 5 August 2020 / Accepted: 5 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Increasing of ac/dc power supply, losses, and harmonic problems arise and power factor decrease due to the presence of the converter. Therefore, a fast, accurate and high-power supply performance became mandatory. In this paper, a new topology of dual flyback converters operated in parallel is introduced to increase the power factor, decrease the total current harmonic distortion and reduce the losses. The first flyback converter is utilized as dc/dc stage used to regulate the output voltage by adjusting the duty cycle. While the second flyback converter is utilized as ac/dc stage, it is also used for the power factor correction and reducing the harmonics. The second flyback converter generates the input current to be in phase with the input voltage by regulating the variable frequency and switching period keeping the switching on-time fixed. This topology improves the voltage regulation even if the input voltage is reduced by approximately 60%, small circuit size, improving power factor, reducing the total harmonic distortion, and increased efficiency. Finally, a small-scale prototype platform that has the ability to deal with universal input 80–260 Vrms, enhancing the supply performance, is carried out. The measurements have verified the theoretical analysis to check the effectiveness of the proposed system. Keywords Flyback converter · Total harmonic distortion · Power factor correction
1 Introduction
1.1 Related Works
A widespread using of renewable energy systems, smart devices, electric vehicles, electrical appliances, industrial applications and lighting systems, led to large-scale use of ac/dc power supply. Generally, this reduces the power factor (PF), increases the total harmonic distortion (THD), increases the losses, leads to overheating in transformers, existence a current in the neutral conductor, increases the possibility of occurring electrical resonances in the power system, and a distortion of the line voltage via the line impedance [1].
Recently several circuits have been developed for the power factor correction (PFC). A high-PF LED driver is introduced in [2] by redesigning the converter parameters to increase the efficiency of the integrated buck-flyback converter. Flyback converter modeling of a cascade switching structure is proposed in [3] to achieve startup time in the deeply dimmed phase-cut LED driver. A stable power converter design for LED lamps using a converter currentcontrolled is introduced in [4]. Low dynamic resistance has been used to drive the current in the LED. Authors in [5] discussed the power quality mainly harmonics and the voltage sags which generated from the LED lamps converter. The harmonic distortion in this research was reduced by combining different types of LED lamps. Authors in [6, 7] introduced
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