The forward converter: from the classic to the contemporary

Tan, F.D.

doi:10.1109/apec.2002.989344

Cited by 112 publications

(46 citation statements)

References 10 publications

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“…In order to make the comparison clear, the key variables of equations (7) and (8) are both the input voltage V in in that the input voltages are the same for different converters and the duty cycles and turn ratios are different. According to (7) and (8), the ripples between the two schemes are plotted in Fig.7. ( )…”

Section: B Output Current Ripplesmentioning

confidence: 99%

“…The current ripple of the parallel hybrid forward converter is described in (7). Equation (8) shows the current ripple of the proposed hybrid rectifier with two intervals divided according to the input voltages range corresponding to case 1 and case 2.…”

Section: B Output Current Ripplesmentioning

confidence: 99%

“…However, these combining methods are not suitable for Half-Wave Rectifiers (HWR), which are combined with forward topologies. The forward converters have attracted some attention in that they have less components and simple control [7]- [22]. Literature [12] provided a comprehensive comparison between a parallel hybrid forward converter with one output inductor and the conventional two-phase interleaved forward converter for dc-dc telecom power conversion applications.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: B Output Current Ripplesmentioning

confidence: 99%

Section: B Output Current Ripplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Single-switch forward converter is widely used due to the advantage of simple structure and low cost [1]. But it has disadvantage of high voltage stress of switch, in order to overcome the disadvantage, dual-switch forward topology is proposed.…”

Section: Introductionmentioning

confidence: 99%

Improved soft switching dual switch forward converter

Zhao

2007

IEICE Electron. Express

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An improved soft switching dual-switch forward converter topology is proposed in this paper. Compared with conventional dualswitch forward converter, the proposed converter employs an auxiliary switch and a clamp capacitor to instead of two reset diodes. Therefore, its duty cycle can exceed 0.5 to achieve wide range input voltage, also soft switching can be achieved for all switches. Especially, voltage stress across main switches can be clamped at 1/2 V in , voltage stress across auxiliary switch can be clamped at V in . In addition, due to clamp capacitor series with the transformer, duty ratio can be extended with equation. Thus, as a kind of better cost-effective approach, it is very attractive for high input, wide range and high efficiency application.

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“…However, the conversion efficiency of the converter will not be greatly improved. In recent years, active-clamping techniques have been proposed for both types of converters [2]- [14] to absorb the energy stored in the leakage inductance and to suppress the voltage spikes on the switch. Furthermore, in the forward converter, it completes the energy reset process.…”

Section: Introductionmentioning

confidence: 99%

Analysis, Design and Implementation of a New Chokeless Interleaved ZVS Forward-Flyback Converter

Taheri

Milimonfared²,

Namadmalan³

et al. 2011

Journal of Power Electronics

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This paper presents an interleaved active-clamping zero-voltage-switching (ZVS) forward-flyback converter without an output choke. The presented topology has two active-clamping circuits with two separated transformers. Because of the interleaved operation of the converter, the output current ripple will be reduced. The proposed converter can approximately share the total load current between the two secondaries. Therefore, the transformer copper loss and the rectifier diodes conduction loss can be decreased. The output capacitor is made of two series capacitors which reduces the peak reverse voltage of the rectifier diodes. The circuit has no output inductor and few semiconductor elements, such that the adopted circuit has a simpler structure, a lower cost and is suitable for high power density applications. A detailed analysis and the design of this new converter are described. A prototype converter has been implemented and experimental results have been recorded with an ac input voltage of 85-135Vrms, an output voltage of 12V and an output current of 16A.

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The forward converter: from the classic to the contemporary

Cited by 112 publications

References 10 publications

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

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

Improved soft switching dual switch forward converter

Analysis, Design and Implementation of a New Chokeless Interleaved ZVS Forward-Flyback Converter

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