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

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This paper proposes a two-input transformerless DC-DC converter. The proposed converter has large voltage conversion ratio with low-voltage and current stress on semiconductors and low input current ripple. It can transfer energy as two-phase converter with three and four input voltage sources to increase the availability of the input voltage of the converter. Despite the capability of extending the number of the input sources up to four, the range of operating duty cycle for the switches and the voltage conversion ratio are remained the same as the values for two-input topology of the proposed converter. By increasing diode-capacitor (D-C) cells in upper and lower modules, not only the amount of transferred energy will be increased, but also the voltage stress on semiconductors would be decreased. In this paper, theoretical analysis for continuous current mode (CCM), analysis under discontinuous current mode (DCM), voltage gain and voltages and currents of all of the elements are calculated. Finally, the performance of the proposed converter is confirmed by implemented prototype which converts two 40-V input voltages to output voltage of 600 V with the power of 400 W.high-voltage gain, low-voltage stress on semiconductors, non-isolated converter, two phase dc-dc converter | INTRODUCTIONDC-DC boost converters have different applications, such as, photovoltaic cells, fuel cells, electrical vehicles, hybrid renewable energy systems, uninterruptable power supplies (UPS), battery energy supplies and so on. [1][2][3][4][5][6] There are several methods to improve the input voltage level in dc-dc boost converters. The first approach to achieve high ranges of voltages in conventional boost converters is to apply wider ranges of duty cycles close to unity. 7 However, through this method, several drawbacks, such as large voltage spikes on semiconductor components, may occur; consequently, the conduction losses would be increased. Therefore, there must be some components added to the conventional dc-dc boost converters to obtain higher ranges of voltages. In Liu et al., Babaei et al., Wu et al., Cheng et al. and Babaei and Saadatizadeh,[8][9][10][11][12] several dc-dc converters with high voltage gain are presented which have coupled inductors in their structures like flyback converters or converters with transformers. The converters with transformers in their structures are isolated which enhance their safety comparing to non-isolated converters. Even though, by increasing secondary turns ratio of the couple inductor in the implemented circuit, the voltage conversion ratio of the converter would be

Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

Multi‐input multi‐phase transformerless large voltage conversion ratio DC/DC converter

Saadatizadeh

Heris

Sabahi

2021

Self Cite

“…15 It is also designed to interface three different voltage sources by using three switches. In Saadatizadeh et al , 16 an interleaved DC-DC step-up boost converter with high voltage conversion ratio and low voltage stresses on switches and diodes has been presented to eliminate the input current ripple and to reduce the average current passing through the diodes and switches. The diode-capacitor modules incorporated with the interleaved topology help to increase the voltage gain and to reduce the switching stress.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of PV based modified SEPIC converter fed hybrid electric vehicle (PV‐HEV)

Natchimuthu

Muniraj²,

Mark

2020

This paper presents a high gain modified three-port dual boost single-ended primary-inductor converter (SEPIC) converter operated hybrid photovoltaic (PV)/battery electric vehicle to improve the power transfer capability and efficiency of the power conversion stage. The proposed three-port dual boost high gain SEPIC converter accepts wide voltage range of input then the conventional single stage SEPIC converter. The three-winding high frequency coupling transformer integrates the two input sources and step-up the input voltage. The theoretical and experimental analyses are presented to validate the performance of the proposed modified SEPIC converter in boosting the wide range of input voltage. A 6 kW, 12 to 600 V of experimental model has been developed and tested. The efficiency obtained from the designed model is around 94.11%. K E Y W O R D SDC-DC power conversion, high boost dual input SEPIC converter, hybrid electric vehicle (HEV), hybrid PV/battery, PV array, three-port converter, voltage source inverter (VSI)

“…Several types of interleaved dc-dc topologies were proposed, developed, and carefully studied, among them are unidirectional and bidirectional dc-dc converters for wide range in industrial application, for instance, electric vehicles, photovoltaic, fuel cells, renewable sources, hybrid systems, and battery power supplies. [1][2][3][4][5][6][7][8][9][10] The conventional dc-dc buck converter is widely used because of its practical function (output voltage reduction) and the simplicity of the topology, which is characterized without isolation and the low number of components. On the other hand, it is not suitable in applications that require a voltage gain above 0.8, due to the need of the operations with very high duty cycle values (duty cycle higher than 80%).…”

Section: Introductionmentioning

confidence: 99%

“…The published researches and extensive developments of interleaved dc–dc nonisolated converters for application in high and low power density have prominently displayed an intensive expansion in recent years. Several types of interleaved dc–dc topologies were proposed, developed, and carefully studied, among them are unidirectional and bidirectional dc–dc converters for wide range in industrial application, for instance, electric vehicles, photovoltaic, fuel cells, renewable sources, hybrid systems, and battery power supplies 1–10 …”

Section: Introductionmentioning

confidence: 99%

Four‐phase interleaved DC–DC step‐down converter using coupled inductor for high power application

Kattel

Mayer

Oliveira

et al. 2020

The objective of this manuscript is to analyze and design a new interleaved dc-dc buck-type converter based on the conventional interleaved topologies. The proposed converter consists of small size filters, few component numbers, and low current and voltage ripple compared with interleaved dc-dc converter family. Furthermore, detailed comparisons are made concerning the operating mode, the component numbers, dc voltage gain, voltage stresses, output inductor current ripple, rated power, and efficiency. The presented converter might replace the conventional dc-dc step-down voltage converter stage of poor power quality and low energy density, such as the one used in high power ac-dc battery chargers and dc sources, among others. Experimental results conducted on a 4.8-kW laboratory prototype are presented to validate the theoretical study and prove the effectiveness of the proposed topology. The maximum efficiency level reaches 97.2% at rated power. K E Y W O R D S battery charger, coupled inductor, interleaved dc-dc converter, no-isolated dc-dc converter, stepdown dc-dc converter