A Zero-Voltage and Zero-Current Switching Interleaved Two-Switch Forward Converter With Passive Auxiliary Resonant Circuit

Chu, Enhui; Bao, Jiaqi; Xie, Haolin; Hui, Guotao

doi:10.1109/tpel.2019.2944890

Cited by 13 publications

(12 citation statements)

References 21 publications

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“…In recent years, many types of research have been performed, and different challenges about the mentioned issues are discussed in previous studies. [8][9][10][11][12][13][14][15][16][17][18][19][20] But the isolated high step-down converters have not been researched satisfactorily. Many different types of isolated topologies could be used for high step-down converters, but the voltage stress on the transformer's primary side elements is high.…”

Section: Introductionmentioning

confidence: 99%

Analysis and implementation of an isolated high step‐down converter with interleaved output for low voltage applications

Sani

Banaei

Hosseini

2022

Circuit Theory & Apps

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This paper proposes a new isolated high step‐down dc‐dc converter with a more extensive output range and high efficiency. The interleaved output and ZVS‐ZCS switching for all semiconductors have made the converter appropriate for high output current applications. An auxiliary inductor is used to achieve the ZVS (zero‐voltage switching) and ZVZCS (zero‐voltage zero‐current switching) condition, which charges and discharges the parallel snubber capacitors of the power switches at different modes of operation. Therefore, the switching losses of semiconductor components are reduced significantly, which results in enhanced efficiency. Moreover, the connection of an auxiliary capacitor in series with the transformer has prevented the probability of DC‐current saturation. The proposed converter could be controlled with duty‐cycle or switching frequency variations. However, the output voltage control with the switching frequency variations gives an extended range of output voltage compared with the other presented converters. Moreover, a coupled inductor is used to relate the output gain with the turn ratios, which causes a more extensive range for output voltage gain. Finally, the theoretical analysis is given and is compared with a 140 W experimental prototype, which converts a higher input voltage 300v to 7.5 V of the output voltage.

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Section: Introductionmentioning

confidence: 99%

Analysis and implementation of an isolated high step‐down converter with interleaved output for low voltage applications

Sani

Banaei

Hosseini

2022

Circuit Theory & Apps

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“…The applications such as photovoltaic energy systems and uninterrupted power supplies (UPS) require the dc-dc bidirectional converter (BDC) with the wide power range to interface energy storage systems such as battery to the high voltage dc bus [1][2][3][4][5]. Increasing the power density, decreasing the weight and cost of bidirectional converters which are provided by increasing the switching frequency [6][7][8]. An important barrier to increasing the switching frequency is switching losses.…”

Section: Introductionmentioning

confidence: 99%

An improved wide ZVS soft‐switching range PWM bidirectional forward converter for low power applications with simple control circuit

Bahrami

Allahyari

Adib

2022

IET Power Electronics

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This paper presents a new PWM (Pulse Width Modulation) ZVS (Zero Voltage Switching) bidirectional forward DC‐DC converter. The proposed bidirectional forward converter uses two main switches and employs the leakage inductance of the transformer to transfer the power. Two auxiliary capacitors are paralleled with the main switches to provide the ZVS soft‐switching condition and to reset the transformer core. Having two main switches, one transformer, and two auxiliary capacitors makes the proposed converter simple and low cost. Compared with the main counterpart, the proposed converter uses PWM which is really simple relative to the phase shift voltage matching control approach. Moreover, to provide the ZVS soft switching conditions, the magnetizing inductance value should be large which decreases the circulating current and increases the efficiency significantly in both boost and buck directions especially at the low power. The ZVS soft‐switching conditions can be maintained from low power to full load. The operating modes of the proposed converter along with the design approach and the stress analysis are completely considered. To verify the theoretical results, a prototype is constructed and the theoretical results are compared with the experimental results.

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“…The conventional unidirectional forward (CUF) converter has some problems such as hard switching, the switch voltage spike caused by the transformer leakage inductance, and an additional circuit for the core reset. To remove problems, many topologies are proposed in the literature [13–27]. In [13, 14], auxiliary circuits employ the additional switch, diode, capacitor, and inductor to provide the turn‐on ZCS condition.…”

Section: Introductionmentioning

confidence: 99%

“…Several zero‐voltage switching (ZVS) unidirectional forward converters are proposed in [16–27]. In [16, 17], an additional diode must be added in the main power path to provide the ZVS soft‐switching condition, which increases conduction losses.…”

Section: Introductionmentioning

confidence: 99%

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Simple low‐cost ZVS bidirectional forward converter with phase shift control and voltage matching for low power applications

Bahrami

Ghavideljaliseh

Adib

2020

IET power electron.

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In this study, a new zero‐voltage switching (ZVS) output inductor‐less bidirectional forward (OILBF) converter is presented. The OILBF has two diodes less than the conventional forward converter and is convenient for low‐power bidirectional applications. Moreover, the OILBF converter uses the leakage inductance of transformer as the forward inductor. In the proposed OILBF, two capacitors paralleled with main switches realise ZVS conditions for main switches in both directions without any auxiliary switches. Also, the reset of the converter transformer is done without any additional circuit. The proposed converter structure due to employing simultaneously OILBF topology with the simple auxiliary soft‐switching circuit is simple and low cost. The ZVS soft‐switching range is from light load to full load which enhances the converter efficiency. Phase shift is applied with the proposed converter. The proposed converter is completely analysed and its design approach is considered. Finally, an experimental prototype is implemented to verify theoretical results.

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A Zero-Voltage and Zero-Current Switching Interleaved Two-Switch Forward Converter With Passive Auxiliary Resonant Circuit

Cited by 13 publications

References 21 publications

Analysis and implementation of an isolated high step‐down converter with interleaved output for low voltage applications

Analysis and implementation of an isolated high step‐down converter with interleaved output for low voltage applications

An improved wide ZVS soft‐switching range PWM bidirectional forward converter for low power applications with simple control circuit

Simple low‐cost ZVS bidirectional forward converter with phase shift control and voltage matching for low power applications

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