Digital implementation of the feedforward loop of the asymmetrical half-bridge converter for LED lighting applications

Arias, Manuel; Fernández, Marcos; Rodriguez, Jose Evelio; Lamar, Diego G.; Sebastián, J.

doi:10.1109/ecce.2013.6647157

Cited by 7 publications

(3 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although these topologies have a low component count, they suffer from low efficiencies (<90%) and the inability to remove the bulk capacitor required in PFC. However, the removal of the bulk capacitor is not always possible in a single-stage without including more active components [10]- [14] or distorting the input current [15] [16]. This occurs due to the pulsating input power of the grid, which must be decoupled from the HB-LEDs in order to avoid the well-known flicker phenomenon.…”

Section: Introductionmentioning

confidence: 99%

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Castro¹,

Martin²,

Vázquez³

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

View full text Add to dashboard Cite

An ac-dc single-stage driver for High Brightness Light-Emitting Diodes with galvanic isolation is presented in this paper. The driver is based on a Dual Inductor Current-Fed Push-Pull converter with each inductor operating in Boundary Conduction Mode. The interleaving between the two inductors enables the converter to reduce the high input current ripple inherent to a BCM. Moreover, it is fully compliant with IEC 1000-3-2 Class C and it is able to achieve a high Power Factor. Its low component count, simplicity and overall outstanding characteristics make this current-fed topology suitable for medium power range HB-LED drivers in low cost applications. The proposed topology has been tested on a 100W prototype for the full range of the US single-phase line voltage, feeding several HB-LED strings, with an output voltage equivalent to 48V at full load. The prototype achieves a maximum efficiency of 92% with a 0.99 power factor, 8% THD at full load while guaranteeing good quality light.

show abstract

Section: Introductionmentioning

confidence: 99%

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Castro¹,

Martin²,

Vázquez³

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

Self Cite

View full text Add to dashboard Cite

show abstract

“…As LED light source is usually driven by a constant current, the quality of driver will affect the overall performance of the light source. Asymmetric half-bridge converter has features of high conversion efficiency, low voltage stress, constant frequency control, and a small capacitive filter [4], it has great advantages when applied to high-power LED driver [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Discrete-Time Modeling of High Power Asymmetric Half-Bridge LED Constant-Current Driver Controlled by Digital Current Mode

Qiao¹,

Wang²,

Wang³

et al. 2020

Preprint

View full text Add to dashboard Cite

The high-power Asymmetric half-bridge Converter (AHBC) LED constant current driver controlled by digital current mode is a fourth-order system. Static operating point, parasitic resistance, load characteristics, sampling effect, modulation mode and loop delay will have great influence on its dynamic performance. In this paper, the small-signal pulse transfer function of the driver is established by the discrete-time modeling method for the two operating points corresponding to the three modulation modes of the trailing edge, leading edge and double edge. And, the effects of parasitic parameters, delay effect, sampling effect and load effect are fully considered in modeling. For a large number of complex exponential matrix operations, the first order Taylor formula is used for approximate calculation after the coefficient matrix is obtained by substituting the data. Then, Matlab software is used to compare and analyze the discrete-time model and the discrete-average model. The results show that the proposed discrete-time model can more accurately characterize the resonant peak and high-frequency dynamic characteristics, and is very suitable for the design of high frequency digital controller.

show abstract

“…However, when the AHB converter is designed to operate over a wide range of input voltage to satisfy a hold-up time requirement, it has asymmetrical duty ratio in the nominal state that causes many problems [5]- [9]. First, it has a large dc-offset current in the transformer as shown in Fig.…”

mentioning

confidence: 99%

High-Efficiency Asymmetrical Half-Bridge Converter With a New Coupled Inductor Rectifier (CIR)

Han

Kim

Lee

et al. 2019

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

A conventional asymmetrical half-bridge (AHB) converter is one of the most promising topologies in low-power applications because of the zero-voltage switching (ZVS) of all switches and the small number of components. However, when it operates with an asymmetrical duty ratio, it has a large dc-offset current in the transformer, which increases the size and core loss of the transformer. Moreover, because the dc-offset current decreases ZVS energy for one of the half-bridge switches, it has low efficiency in a light load condition. In addition, because most of the output current is concentrated in high-voltage-rating diodes that have large forward voltage drops, large conduction loss occurs in the secondary rectifier. To solve these problems, a new AHB converter with a coupled inductor rectifier (CIR) is proposed in this paper. By adopting the CIR structure in the AHB converter, the proposed converter not only eliminates the dc-offset current in the transformer, but it also has equalized current stress in the rectifier diodes. As a result, the proposed converter achieves high efficiency in entire load condition, compared to an AHB converter with a full-bridge rectifier. The effectiveness and feasibility are verified with a 250-400 V input and 100 V/200 W output prototype.Index Terms-Asymmetrical half-bridge (AHB) converter, coupled inductor rectifier (CIR), dc-offset current, high efficiency, zero-voltage switching (ZVS). I. INTRODUCTIONA N ASYMMETRICAL half-bridge (AHB) converter shown in Fig. 1(a) is one of the most promising topologies for low-power applications, such as TV and LED drivers, because of its small number of components. In addition, all of the primary switches not only have zero-voltage switching (ZVS) capability, but also have clamped voltage stress [1]-[4].

show abstract

Digital implementation of the feedforward loop of the asymmetrical half-bridge converter for LED lighting applications

Cited by 7 publications

References 30 publications

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Discrete-Time Modeling of High Power Asymmetric Half-Bridge LED Constant-Current Driver Controlled by Digital Current Mode

High-Efficiency Asymmetrical Half-Bridge Converter With a New Coupled Inductor Rectifier (CIR)

Contact Info

Product

Resources

About