A Modified Asymmetrical Half-Bridge Flyback Converter for Step-Down AC–DC Applications

Huang, Ying-Hsuan; Li, Chia-Hao; Chen, Yaow-Ming

doi:10.1109/tpel.2019.2940322

Cited by 33 publications

(14 citation statements)

References 26 publications

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“…But it should be noted that their efficiency and THD value are based on the reported values in the original paper since they could not operate with bulk capacitor voltage less than input peak voltage. The implementation price of [9, 27] and [34] are high since they apply more than one switch and require isolated gate drive. Also due to the number of the magnetic components, [35] has high price.…”

Section: Comparison With Other Structuresmentioning

confidence: 99%

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High performance single stage power factor correction circuit

Ghazali

Adib

2021

IET Power Electronics

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Here, a new single stage single switch soft switching PFC (power factor correction) converter is presented and analysed. The proposed converter combines buck AC‐DC converter and forward DC‐DC converter and applies an auxiliary circuit to eliminate input current dead angle. Furthermore, soft switching is attained and switching losses are eliminated resulting in high efficiency. Another merit of the proposed converter is the partial direct transmission of input power to the output that helps to improve efficiency. Experimental results are presented which justify the above mentioned points and show less than 5% THD in the nominal load. Comparison with other similar single stage PFC converters is performed and shows the proposed converter provides the lowest THD while high efficiency is attained.

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Section: Comparison With Other Structuresmentioning

confidence: 99%

“…The structure introduced in [33] is proper for high power multi string LED driver when isolation is not necessary. In [34], very good structure is introduced which uses two switches and it is proper for medium power applications. In [35] the introduced structure completely eliminates all sources of switching losses.…”

Section: Introductionmentioning

confidence: 99%

High performance single stage power factor correction circuit

Ghazali

Adib

2021

IET Power Electronics

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“…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

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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.

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“…Moreover, the resonant nature of the dc-dc stage is neglected. Another application of the AHBFC, integrated with a DCM-operated Buck-type rectifier, was proposed in [28] and [29] for high power factor ac-dc applications. While the solution in [28] presents the typical dead zone in the line current of buck-type rectifiers, the circuit proposed in [29] achieves a better power factor by introducing a series-connected energy buffer, as was done in [22].…”

mentioning

confidence: 99%

“…Another application of the AHBFC, integrated with a DCM-operated Buck-type rectifier, was proposed in [28] and [29] for high power factor ac-dc applications. While the solution in [28] presents the typical dead zone in the line current of buck-type rectifiers, the circuit proposed in [29] achieves a better power factor by introducing a series-connected energy buffer, as was done in [22]. However, both schemes present high conduction losses of the input stage, being the input current forced to flow through the series combination of a diode and a switch, besides the two input bridge diodes.…”

mentioning

confidence: 99%

An Isolated Soft-Switched High-Power-Factor Rectifier Based on the Asymmetrical Half-Bridge Flyback Converter

Spiazzi

Buso

2022

IEEE Trans. Ind. Electron.

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This article presents the analysis and design of a high-power-factor rectifier that integrates a discontinuous conduction mode operated Boost input cell with an asymmetrical half-bridge flyback converter (AHBFC). The particular connection of the dc-dc stage with the boost cell makes the dc link voltage decrease at light load, thus naturally limiting the switches' voltage stress. A suitable design procedure is described that accounts for the resonant nature of the AHBFC, and allows to calculate all converter parameters to meet the design specifications and to achieve zero-voltage turn-ON for the switches in any operating condition, considering both input voltage and load variations. The theoretical analysis is validated by experimental results taken on a 160 W rated prototype, working at the nominal switching frequency f s = 400 kHz, with a line voltage rms value ranging from 85 to 135 V.

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A Modified Asymmetrical Half-Bridge Flyback Converter for Step-Down AC–DC Applications

Cited by 33 publications

References 26 publications

High performance single stage power factor correction circuit

High performance single stage power factor correction circuit

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

An Isolated Soft-Switched High-Power-Factor Rectifier Based on the Asymmetrical Half-Bridge Flyback Converter

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