Non-isolated multi-input DC-DC converter with current sharing mechanism
TL;DR: A non-isolated multi-input DC-DC converter (MIC) topology is presented to integrate renewable energy sources (RES) with the load and is validated by conducting experimental results using a laboratory prototype.
Abstract: In this paper, a non-isolated multi-input DC-DC converter (MIC) topology is presented to integrate renewable energy sources (RES) with the load. The proposed MIC consists of two identical high gain...
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TL;DR: In this paper , the authors presented a solar photovoltaic energy harvesting system for charging the high voltage electric vehicle battery using a partial resonant inverter driven doubler rectifier circuit.
18 citations
TL;DR: In this article , the partially isolated multi-port DC-DC converter topography for renewable energy harvested in DC micro-grid is presented, where the model predictive control based MPC provides highly efficient operation, low static error, and better load regulation irrespective of the category.
14 citations
TL;DR: This paper analytically establishes properties of stability, output ripple, output voltage, and design for asymmetrical paralleled boost converters operating in DCM with simultaneous or phase delayed (sequential) triggering, resulting in an easy-to-implement configuration with acceptable efficiency.
Abstract: Paralleled boost asymmetric configurations operating in discontinuous conduction mode (DCM) are suitable for integrating dissimilar green energy generating sources and control algorithms in versatile scenarios where voltage step-up, low cost, stable operation, low output ripple, uncomplicated design, and acceptable efficiency are needed. Unfortunately, research has mainly been conducted on the buck, sepic, switched-capacitor, among other asymmetric configurations operating in continuous conduction mode (CCM), to the authors’ knowledge. For asymmetric boost type topologies, achieving simultaneous CCM is not a trivial task, and other problems such as circulating currents arise. Research for interleaved converters cannot be easily extended to asymmetric boost topologies due to the dissimilarity of control algorithms and types of sources and parallel stages. This paper analytically establishes properties of stability, output ripple, output voltage, and design for asymmetrical paralleled boost converters operating in DCM with simultaneous or phase delayed (sequential) triggering. A 300 W experimental design and the respective tests allow validation of such properties, resulting in an easy-to-implement configuration with acceptable efficiency.
4 citations
TL;DR: In this article, a non-isolated interleaved (NII) high step-up gain DC-DC converter is proposed for high power applications, which achieves high step up voltage gain without a h...
Abstract: This paper proposes a new Non-Isolated Interleaved (NII) high step-up gain DC-DC converter. This new topology aimed for high power applications, which achieves high step-up voltage gain without a h...
3 citations
TL;DR: In this paper , a new structure of a non-isolated multi-input converter is presented that is capable of generating high voltages to increase the efficiency of the converter, which uses a combination of a coupled inductor and a voltage multiplier cell.
Abstract: In this paper, a new structure of a non-isolated multi-input converter is presented that is capable of generating high voltages to increase the efficiency of the converter, which uses a combination of a coupled inductor and a voltage multiplier cell. By combining these two methods, it is possible to use switches with low voltage stress and therefore low conductivity. This type of structure is suitable for photovoltaic (PV) applications. The proposed converter has two distinct phases for each input, which can be used to properly control the energy received from each source using two separate phases. The performance of the proposed converter depends on the charging or discharging mode of the energy storage system (ESS). To design a high step-up non-isolated multi-input converter, first the structure and performance of the proposed converter are thoroughly investigated. The exact design method is presented for the correct operation of the converter and the simulation results for different modes of the converter operation are shown. Finally, in order to confirm the accuracy of the simulation results of the proposed converter, a laboratory sample of the proposed converter to supply a 400 W–400 V load is implemented and a comparison between the theoretical and practical results is performed.
2 citations
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TL;DR: In this article, the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on was introduced.
Abstract: This paper introduces the use of the voltage multiplier technique applied to the classical non-isolated dc-dc converters in order to obtain high step-up static gain, reduction of the maximum switch voltage, zero current switching turn-on. The diodes reverse recovery current problem is minimized and the voltage multiplier also operates as a regenerative clamping circuit, reducing the problems with layout and the EMI generation. These characteristics allows the operation with high static again and high efficiency, making possible to design a compact circuit for applications where the isolation is not required. The operation principle, the design procedure and practical results obtained from the implemented prototypes are presented for the single-phase and multiphase dc-dc converters. A boost converter was tested with the single-phase technique, for an application requiring an output power of 100 W, operating with 12 V input voltage and 100 V output voltage, obtaining efficiency equal to 93%. The multiphase technique was tested with a boost interleaved converter operating with an output power equal to 400 W, 24 V input voltage and 400 V output voltage, obtaining efficiency equal to 95%.
702 citations
"Non-isolated multi-input DC-DC conv..." refers background or methods in this paper
...As the operation of VMC stage is well understood from Prudente et al. (2008), the operation of Converters 1 and 2 alone is discussed in detail....
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...Therefore, gain extension cells like capacitor-diode voltage multiplier (Prudente et al., 2008), switched-inductor (Zhu et al....
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...Therefore, gain extension cells like capacitor-diode voltage multiplier (Prudente et al., 2008), switched-inductor (Zhu et al., 2017), switched-capacitor (Ye et al., 2017), voltage-doubler (Hu & Gong, 2014) and voltage-lift technique (Chen et al., 2014) are adopted in conjunction with CBC to meet…...
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TL;DR: In this paper, a figure of merit called droop index (DI) is introduced in order to improve the performance of dc microgrid, which is a function of normalized current sharing difference and losses in the output side of the converters.
Abstract: This paper addresses load current sharing and cir- culating current issues of parallel-connected dc-dc converters in low-voltage dc microgrid. Droop control is the popular technique for load current sharing in dc microgrid. The main drawbacks of the conventional droop method are poor current sharing and drop in dcgrid voltage due tothe droop action. Circulating current issue will also arise due to mismatch in the converters output voltages. In this work, a figure of merit called droop index (DI) is introduced in order to improve the performance of dc microgrid, which is a function of normalized current sharing difference and losses in the output side of the converters. This proposed adaptive droop con- trol method minimizes the circulating current and current sharing difference between the converters based on instantaneous virtual resistance Rdroop .U singRdroop shifting, the proposed method also eliminates the tradeoff between current sharing difference and voltage regulation. The detailed analysis and design procedure are explained for two dc-dc boost converters connected in paral- lel. The effectiveness of the proposed method is verified by detailed simulation and experimental studies.
343 citations
TL;DR: In this paper, a single-switch high step-up nonisolated dc-dc converter integrating coupled inductor with extended voltage doubler cell and diode-capacitor techniques is presented.
Abstract: The high-voltage gain converter is widely employed in many industry applications, such as photovoltaic systems, fuel cell systems, electric vehicles, and high-intensity discharge lamps. This paper presents a novel single-switch high step-up nonisolated dc-dc converter integrating coupled inductor with extended voltage doubler cell and diode-capacitor techniques. The proposed converter achieves extremely large voltage conversion ratio with appropriate duty cycle and reduction of voltage stress on the power devices. Moreover, the energy stored in leakage inductance of coupled inductor is efficiently recycled to the output, and the voltage doubler cell also operates as a regenerative clamping circuit, alleviating the problem of potential resonance between the leakage inductance and the junction capacitor of output diode. These characteristics make it possible to design a compact circuit with high static gain and high efficiency for industry applications. In addition, the unexpected high-pulsed input current in the converter with coupled inductor is decreased. The operating principles and the steady-state analyses of the proposed converter are discussed in detail. Finally, a prototype circuit is implemented in the laboratory to verify the performance of the proposed converter.
282 citations
"Non-isolated multi-input DC-DC conv..." refers methods in this paper
...…like capacitor-diode voltage multiplier (Prudente et al., 2008), switched-inductor (Zhu et al., 2017), switched-capacitor (Ye et al., 2017), voltage-doubler (Hu & Gong, 2014) and voltage-lift technique (Chen et al., 2014) are adopted in conjunction with CBC to meet the required high voltage gain....
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TL;DR: The proposed multi- inputs non-isolated DC/DC converter with high-voltage transfer gain benefits from various advantages such as reduced semiconductor current stress, no limitation for switching duty cycle and wide control range of different input powers.
Abstract: A new multi-input non-isolated DC/DC converter with high-voltage transfer gain is proposed in this study. The presented converter consists of the conventional buck–boost and boost converters. All the stages except the last stage are buck–boost converters. The last stage is the conventional boost converter. The proposed multi-input high-voltage gain converter benefits from various advantages such as reduced semiconductor current stress, no limitation for switching duty cycle and wide control range of different input powers. The presented converter can even operate when one or some power input fail to provide energy to the load. The steady-state operation and dynamic modelling of the suggested converter are analysed thoroughly. Experimental results are also provided to verify the feasibility of the presented converter.
165 citations
"Non-isolated multi-input DC-DC conv..." refers background in this paper
...The MIC proposed in Banaei et al. (2014) operates from two sources....
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...The voltage gain for the converter in Banaei et al. (2014) varies from 3 to 5 while the converter presented in Kumar & Jain (2013b) operates with a voltage conversion ratio in the range of 2 to 5. The converter proposed in Vargil Kumar & Veerachary (2014) has lowvoltage gain of 6. The converter presented in Hou et al. (2016) has a moderate voltage gain ranging between 8 and 12....
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...The voltage gain for the converter in Banaei et al. (2014) varies from 3 to 5 while the converter presented in Kumar & Jain (2013b) operates with a voltage conversion ratio in the range of 2 to 5. The converter proposed in Vargil Kumar & Veerachary (2014) has lowvoltage gain of 6. The converter presented in Hou et al. (2016) has a moderate voltage gain ranging between 8 and 12. The output voltage of converters presented in Banaei et al. (2014), (Deihimi et al., 2017; Haghighian et al., 2017; Hema Rani et al., 2019; Mohammadi et al., 2019) and Kumar & Jain (2013b) reduce if any one of the input sources is unavailable....
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...The voltage stress across switches for the converter presented in (Banaei et al., 2014; Mohammadi et al., 2019) is half of its output voltage and for the converter presented in Kumar & Jain (2013b) is 70% of its output voltage....
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...The voltage gain for the converter in Banaei et al. (2014) varies from 3 to 5 while the converter presented in Kumar & Jain (2013b) operates with a voltage conversion ratio in the range of 2 to 5. The converter proposed in Vargil Kumar & Veerachary (2014) has lowvoltage gain of 6. The converter presented in Hou et al. (2016) has a moderate voltage gain ranging between 8 and 12. The output voltage of converters presented in Banaei et al. (2014), (Deihimi et al....
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TL;DR: In this article, the authors present some of the recent trends in the development of multi-input and multi-output DC-DC converters, their operational principles, merits and demerits are studied.
Abstract: Power electronics DC–DC converters are being widely used in various applications like hybrid energy systems, hybrid vehicles, aerospace, satellite applications and portable electronics devices. In the recent past, a lot of research and development has been carried out to enhance the reliability, efficiency, modularity and cost effectiveness of these converters. A number of new topologies have been proposed and new characteristics of power conversion have been defined. DC–DC converters have made a successful transition from single input–single output to multiinput–multioutput converters. These converters are now able to interface different level inputs and combine their advantages to feed the different level of outputs. Research is continued to bring down the cost and reduce the number of components while keeping the continuous improvement in the areas like reliability and efficiency of the overall system. The study of different multiinput DC–DC converter topologies suggests that there is no single topology which can handle the entire goals of cost, reliability, flexibility, efficiency and modularity single handed. This paper presents some of the recent trends in the development of multiinput and multioutput DC–DC converters. Methods to synthesize multiinput converters, their operational principles, merits and demerits are studied.
151 citations