A new topology for nonisolated multiport zero voltage switching dc‐dc converter

Self Cite

In this paper, an interleaved DC-DC step-up boost converter with high voltage conversion ratio and low voltage stresses on switches and diodes is proposed.The proposed converter has low average current passing through the diodes and switches and low input current ripple as a feature of interleaved converters. The voltage gain of the proposed converter can be increased by adding more diode-capacitor modules; therefore, the proposed converter has expandable structure. In addition, by implementing more diode-capacitor modules, the switching stresses would be more decreased. Also, to evaluate the performance of the proposed converter, it is compared with other similar presented circuits in the literature. The proposed converter is not only able to provide higher voltage gain but also has lower voltage stresses on switches and diodes.Consequently, switches and diodes with low voltage ratings can be selected.Theoretical analysis is provided in this study for each operation mode and the average current through the switches, diodes and inductors, voltage stresses on switches and diodes, voltage gain, and input current ripple are calculated. Finally, to demonstrate the accuracy performance of the proposed converter, a 450-W prototype is implemented practically.KEYWORDS diode-capacitor, high voltage gain, interleaved DC-DC converter, low input current ripple, low voltage stresses on switches

Section: Design Considerationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Expandable interleaved high voltage gain boost DC‐DC converter with low switching stress

Saadatizadeh

Heris

Babaei

et al. 2019

Self Cite

“…Nowadays, DC‐DC converters are popular power electronic‐based circuits that have attracted many researchers' and industries' interests in various applications . The switched‐capacitor (SC) converters are of the most important DC‐DC converters, which are increasingly used because of their capabilities and features like lower electromagnetic interference (EMI), lighter weight, lower cost, higher energy density, and the potential for full integration .…”

Section: Introductionmentioning

confidence: 99%

A zero‐current switching switched‐capacitor DC‐DC converter with reduction in cost, complexity, and size

Abbasi

Tousi

et al. 2019

Summary This paper presents a new step‐up switched‐capacitor (SC) DC‐DC converter which has many advantages such as reduction in investment cost, control complexity, number of components, voltage stress on components, and size over traditional topologies. In the proposed structure, power switches are reduced in number which in turn leads to the merits mentioned earlier and makes the converter more suitable for industrial applications. Furthermore, a previously introduced zero‐current switching (ZCS) method is used here which provides soft switching for the devices. There is also a reduction in the number of required inductors to achieve ZCS due to the decreased number of switches in the proposed converter. The proposed converter is validated by comprehensive simulation results in MATLAB Simulink environment and also precise experimental results which show the acceptable performance of the proposed topology.

“…However, high‐circulating current, the high voltage stress across the output diode, and low efficiency are the significant drawbacks in this method . In the other categories, the non‐isolated DC‐DC converters can be used to attain voltage step‐up or step‐down that leads to the reduction of size, weight, and volume associated to the increase of efficiency because of the lack of a high‐frequency transformer . If the conventional DC ‐ DC boost converter is used to attain the high output voltage, an extremely high duty ratio is needed.…”

Section: Introductionmentioning

confidence: 99%

P‐type non‐isolated boost DC‐DC converter with high voltage gain and extensibility for DC microgrid applications

Mohammadi

Farhadi‐Kangarlu

Rastegar

et al. 2019

Summary In this paper, the concept of converter design, using the least number of elements and achieving high voltage gain at the low duty cycle, is proposed for the microgrids. One of the important issues in the microgrids is boosting the low voltage output of sources to the utility voltage level. Therefore, the step‐up DC‐DC converters are widely used in these systems to attain the utility voltage. The benchmarking of the converters mainly in terms of the voltage gain, efficiency, the number of active and passive components, stresses on semiconductors, and simplicity is considered. In this paper, a new extendable non‐isolated boost DC‐DC converter is presented. Comparing the conventional boost converter, the basic structure of the proposed converter has a high voltage gain and reduced stress on the switch. To increase the voltage gain, the basic structure of the proposed converter can be easily extended. The modulation technique employed is high‐frequency pulse‐width modulation (PWM). The detailed analysis of the proposed converter in continuous current mode (CCM) and discontinuous current mode (DCM) is presented. The relations between currents and voltages and the voltage gain in CCM and DCM are obtained. Experimental results are carried out to verify theoretical concepts by using the hardware prototype.