Analysis, design and implementation of a new zero-voltage-switching interleaved asymmetrical half-bridge converter using an integrated transformer

Taheri, M.; Milimonfared, Jafar; Bayat, Hamid Reza; Fathi, S. H.

doi:10.1049/iet-pel.2011.0354

Cited by 11 publications

(14 citation statements)

References 18 publications

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“…Hence, the duty cycle D of the proposed converter is initially chosen to be 0.65, which is an average value of 0.6 and 0.7. By substituting this value, (25) and the system specifications shown in Table II, into (7), N 2 can be expressed as…”

Section: Section Of Turns Ratio and Duty Cyclementioning

confidence: 99%

“…Besides, because of this circuit structure, the corresponding output current ripple is higher than that of the traditional forward converter. Moreover, some half-bridge-type isolated converters are presented [21][22][23][24][25]. In [25], a half-bridge-type converter, which integrates the forward and flyback converters by sharing a single core, is presented.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, some half-bridge-type isolated converters are presented [21][22][23][24][25]. In [25], a half-bridge-type converter, which integrates the forward and flyback converters by sharing a single core, is presented. Although this converter combines the forward and flyback converters, it still possesses the behavior of the non-pulsating output current of the forward converter.…”

Section: Introductionmentioning

confidence: 99%

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Isolated high voltage‐boosting converter derived from forward converter

Hwu

Jiang

Chien

2015

Circuit Theory & Apps

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SUMMARYA novel isolated high voltage-boosting converter, derived from the traditional forward converter, is presented in this paper. As compared with the traditional forward converter, the demagnetizing winding of the transformer in the proposed converter is used not only to demagnetize but also to improve the voltage conversion ratio. Therefore, the duty cycle is not limited, and the utilization of the transformer, also called coupled inductor, can be increased also. Furthermore, the proposed converter maintains the advantage of possessing a non-pulsating output current, leading to a small output voltage ripple. Moreover, by applying one additional voltage-boosting winding to the transformer, the voltage conversion ratio can be significantly improved. In addition, an active clamp circuit is employed in the proposed converter to reduce the voltage stress of the main switch, caused by the leakage inductance in the transformer, and the switches can achieve zero-voltage switching. Finally, the analysis of operating principles, choice of the turns, turns ratio, core size, and each wire size of the coupled inductor are described in detail, and the experimental results with a prototype with 12-V input voltage, 100-V output voltage, and 100-W output power are provided to verify the feasibility and effectiveness of the proposed converter.

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Section: Section Of Turns Ratio and Duty Cyclementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isolated high voltage‐boosting converter derived from forward converter

Hwu

Jiang

Chien

2015

Circuit Theory & Apps

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“…When the dimming range is large, the voltage of the dc-link capacitor changes greatly. Generally, the methods of symmetrical pulse-width modulation (PWM) or asymmetrical pulse-width modulation (ASPWM) are often used to control the active switches to regulate LED power [16][17][18][19]. When both control schemes are compared, the voltage across the dc-link capacitor of the PWM scheme is higher than that of the ASPWM one [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the methods of symmetrical pulse-width modulation (PWM) or asymmetrical pulse-width modulation (ASPWM) are often used to control the active switches to regulate LED power [16][17][18][19]. When both control schemes are compared, the voltage across the dc-link capacitor of the PWM scheme is higher than that of the ASPWM one [18,19]. Although the ASPWM scheme always incurs noticeable dc-offset current in the transformer, resulting in increasing transformer core loss [20], the dc-offset current can be easily eliminated by connecting a dc-balance capacitor in series with the primary winding.…”

Section: Introductionmentioning

confidence: 99%

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

et al. 2020

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This paper proposes a dimmable light-emitting diode (LED) driver featuring a high power factor and zero-voltage switching on (ZVS). The circuit is obtained by integrating a boost converter and a dc-dc converter with half-bridge topology. The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM). The LEDs are dimmed by the control scheme of asymmetrical pulse-width modulation (ASPWM). The developed circuit eliminates the inherited dc-offset current of the transformer in a conventional asymmetrical half-bridge converter by introducing a balance capacitor. Both active switches can operate at ZVS by freewheeling the boost inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance. The circuit operation is analyzed in detailed, and mathematical equations are derived. Finally, a 115-W prototype circuit for driving high brightness LEDs was built and tested. The experimental results verify the feasibility of the proposed LED driver with satisfactory performance. It can achieve a high power factor and ZVS operation.

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A new integrated high step‐up quasi‐resonant flyback‐forward converter

Dobakhshari

Taheri

Banaiemoghadam

et al. 2018

Circuit Theory & Apps

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SummaryThis study presents a new high step‐up, high efficiency, flyback‐forward converter. The proposed converter employs 2 transformers, operating in flyback and forward modes at different intervals, to achieve the high voltage gain. In favor of high power density, transformers have been installed on 1 core. Furthermore, all switches are turned on under zero voltage switching condition, and all diodes are turned off under zero current switching condition. Also, the proposed converter utilizes resonant operation that leads to a reduction in switching loss, turning the converter to a highly efficient one. A 150‐W prototype has been implemented to verify the theoretical analysis, and a complete analysis has been done to investigate the effect of transformers integration.

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Analysis, design and implementation of a new zero-voltage-switching interleaved asymmetrical half-bridge converter using an integrated transformer

Cited by 11 publications

References 18 publications

Isolated high voltage‐boosting converter derived from forward converter

Isolated high voltage‐boosting converter derived from forward converter

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

A new integrated high step‐up quasi‐resonant flyback‐forward converter

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