Fully Integrated Buck and Boost Converter as a High Efficiency, High-Power-Density Off-Line LED Driver

Abstract

In this article, a high-power-density off-line lightemitting diode (LED) driver is proposed. The proposed ac-dc driver is the novel integrated buck and boost converter (IBBC). Besides the high-power-density, the converter shows a high power factor (PF), and a low total harmonic distortion (THD). The IBBC is a two-stage driver that features just one controlled switch, which leads to high PF and low THD operation ensuring high efficiency, and size and cost reduction. Moreover, the switch current is minimized as it conducts the higher of the buck or boost converter, but not the addition of both as in other integrated converters. Moreover, for a further increase of the power-density, a magnetic integration is made by integrating the two inductors of both the buck and boost converters in one core. Thus, the proposed converter has been named as fully integrated buck and boost converter (FIBBC). In this paper, the IBBC is analyzed, and a design methodology is proposed. Also, this article presents a magnetic analysis of the novel FIBBC. In addition, a comparison between two prototypes is presented, one for the IBBC and another for the FIBBC, both of them supplying an LED luminaire of 46 V/ 0.575 A. The FIBBC shows a high PF equal to 0.994, very small THD of 10%, output current ripple of 6%, and efficiency of 92.62%, which represents a landmark on the efficiency of integrated converters. Index Terms-Fully integrated buck and boost converter (FIBBC), high efficiency light-emitting diodes (LEDs) driver, integrated converters, magnetic integration, off-line LED drivers, power factor correction. I. INTRODUCTIONL IGHT-EMITTING diodes (LEDs) were first developed in 1960s [1]. Nowadays, they have become one of the most popular lighting sources in a wide variety of applications.

A comprehensive review on various non-isolated power converter topologies for a light-emitting diode driver

“…The PF decreases for the increase in input voltage. A high power density offline LED was proposed to be integrated with a buck and boost converter, as shown in Figure 10C (Abdelmessih et al, 2020). The topology results in low THD and better PF with a single controlled switch.…”

Actual Reasons Involving Turn-Off Losses Improvement With Increasing Load and Gate Resistance in MOSFETs Enhanced With Kelvin Source

“…The design of efficient power converters is highly desirable to obtain environmental-friendly electric systems and reduce operating costs [1]- [3]. Power density increment is more and more required in many applications and from consumers [4]. The wide-bandgap (WBG) devices present good features that facilitate the achievement of these targets [5] [6].…”

Study of LED Grow Light Driver Circuit for Indoor Strawberry Cultures: A Class Experiment

“…Another important feature is that the drive unit generates less heat. Due to the low loss, the power dissipation is very low, theoretically, the Boost converter drive circuit is more than 90% efficient (Kimball et al, 2004;Sien et al, 2012;Abdelmessih et al, 2020).…”