A double ZVS-PWM active-clamping forward converter

Bascope, Rene P. T.; Barbi, I.

doi:10.1109/apec.1999.749744

Cited by 15 publications

(4 citation statements)

References 5 publications

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“…The main features of the equipment are high efficiency, high frequency, high power density, high power factor and high reliability and meet current development requirement of power supply. Finally, the future trend of the low power communication power supply is analyzed, and it is believed that the paper will give a significant reference to the people who are studying similar converters [1][2][3][4][5][6]. The gain of the carrier is controlled through a voltage loop with the output voltage fed back and compared with a reference voltage.…”

Section: Introductionmentioning

confidence: 99%

A Novel High Power Factor Soft-Switching Converter

Yue

Lin

2012

AMR

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A novel scheme of low power communication power supply with high power factor and soft-switching is presented, a power factor corrector and dc/dc converter of passive lossless soft-switching is based on a ML4803 IC control. DC/DC converter introduces a novel two-transistor forward soft-switching technique, which realizes zero-voltage turn-on and turn-off, with no additional switches. a communication power supply module is developed in this paper. It has the characteristics of rapid dynamic response, high power factor, high efficiency and small bulk ect.

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Section: Introductionmentioning

confidence: 99%

A Novel High Power Factor Soft-Switching Converter

Yue

Lin

2012

AMR

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“…Nevertheless, several clamping topologies presented in the last section have been successfully employed in isolated flyback and forward converters [21]. The forward_boost three-level design found in [21] can be expanded to fivelevel using forward_boost [22].…”

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confidence: 99%

Three-level zero-voltage switching pulse-width modulation DC–DC boost converter with active clamping

Rodrigues

Mussa

Barbi

et al. 2010

IET Power Electron.

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DC -DC step-up converters for high-output voltage applications typically demand high voltage devices, leading to high conduction and switching losses. This identified demand has motivated research on active clamping and multi-level topologies. On this context, this study presents the study of a novel DC -DC boost converter with three-level boost-type active clamping, zero-voltage switching (ZVS) soft-switching and constant frequency pulse-width modulation. As shown analytically and through experimental results, high efficiency and reduced voltage ratings for the power semiconductors are achieved, thus, making the topology suitable for converters requiring high-output DC voltage. Furthermore, a topological modification for achieving ZVS operation in all semiconductors and other types of switching cells for boost-type converters is introduced.

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“…Hybrid converters have become attractive in recent years because of their distributed power dissipation, better thermal management, and low current or voltage stresses [1]- [16]. Papers [1]- [3] proposed hybrid dc-dc converters with hybrid bridge rectifiers.…”

Section: Introductionmentioning

confidence: 99%

Two-Phase Hybrid Forward Convertor with Series-Parallel Auto-Regulated Transformer Windings and a Common Output Inductor

Wu¹,

Chen²

2013

Journal of Power Electronics

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For conventional interleaved two-phase forward converters with a common output inductor, the maximum duty cycle is 0.5, which limits the voltage range and increases the difficulty of the transformer's optimization. A new two-phase hybrid forward converter with series-parallel auto-regulated transformer windings is presented in this paper. With interleaved control signals for the two phases, the secondary windings of the transformers can work in series when the duty cycle is larger than 0.5, and they can work in parallel when duty cycle is lower than 0.5. Therefore, the maximum duty cycle is extended and the turns ratio of the transformer can be optimized. Duty cycle dependent auto-regulated windings result in the steady states of the converter being different in different duty cycle ranges (D>0.5 and D<0.5). Fortunately, the steady state gains of the proposed hybrid converter are identical at different duty cycle ranges, which means a stepless shift between two states. A prototype is built to verify the theoretical analysis. A conventional control loop is compatible for the whole input voltage range and load range thanks to the stepless shifting between the different duty cycle ranges.

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A double ZVS-PWM active-clamping forward converter

Cited by 15 publications

References 5 publications

A Novel High Power Factor Soft-Switching Converter

A Novel High Power Factor Soft-Switching Converter

Three-level zero-voltage switching pulse-width modulation DC–DC boost converter with active clamping

Two-Phase Hybrid Forward Convertor with Series-Parallel Auto-Regulated Transformer Windings and a Common Output Inductor

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