Interleaved Buck Converter Applied to High-Power HID Lamps Supply: Design, Modeling and Control

Abstract

As the output current levels of power converters increase, interleaved topologies become widely used. A well-known topology is the interleaved buck converter (IBC), which presents as main characteristic an inherent low ripple output current source behavior in addition to high efficiency and small volume. At the same time, it is necessary to drive high-intensity discharge (HID) lamps with nearly constant current/power and low-frequency square-wave shape due to HID lamp voltage source characteristics and their acoustic resonance issue. This way, an IBC can be advantageous for supplying such lamps, particularly in high power levels where efficiency and volume become more critical parameters. The goal of this paper is a proposal of an electronic ballast based on a two-cell IBC for high-power HID lamps, with current control loop, voltage sensing, and constant power. A dc model based on averaged state-space technique is obtained for the ballast, as well as an ac model based on small-signal disturbances. A complete concept with a digitally implemented closed loop has been developed and a prototype has been built, successfully achieving performance targets. This paper describes the most relevant aspects of the complete design and presents results both experimental and from simulation in MATLAB/Simulink software.Index Terms-Closed loop, electronic ballasts, high-power highintensity discharge (HID) lamps, interleaved converters, modeling, state-space averaging technique. She is currently a Researcher at the Centre of Competence for Distributed Electric Power Technology (KDEE) based at the University of Kassel. Her interests are mainly, but not limited to, power electronics applications such as renewable energy systems, electric vehicles, lighting systems, and piezoelectric applications.

Multileg Interleaved Buck Converter for EV Charging: Discrete-Time Model and Direct Control Design

“…The model of the buck converter is obtained using the average modeling technique described in [14,24], while the droop control design method is used to model the battery as a power load R [13,25]. This simplified model, compared to other dynamical models, such as Thévenin or non-linear models [26], is generally used in the design of the controller since the product of its voltage and current vary very slowly with respect to the converter dynamics [27].…”

“…Several state-space models of DC/DC interleaved buck converters (IBCs) such as [14] can be found in the literature. However, as highlighted in [12], none of them use duty-cycles as input signals.…”

Research on a Modeling and Control Strategy for Interleaved Boost Converters with Coupled Inductors

“…The state-space averaging method is a popular approach for DC-DC converter modeling [16][17][18]. For interleaved DC-DC converters, the process of small-signal modeling has been proposed in [19][20][21][22][23]. A small-signal model of the interleaved boost using the state-space averaging method was developed by D. Maksimovic and A.…”

“…al. used the state-space averaging method to analyze the operation of a two-phase interleaved buck converter in a high-power, high-intensity discharge lamp supply [21]. However, the above literature used discrete inductors, which differ from the small-signal modeling process of DC-DC converters with coupled inductors.…”