Zero voltage switching differential inverters

Koushki, Behnam; Safaee, Alireza; Jain, Praveen; Bakhshai, Alireza

doi:10.1109/apec.2015.7104606

Cited by 10 publications

(7 citation statements)

References 13 publications

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“…Unlike classical voltage source inverter (VSI), which produces an AC output voltage always lower than the DC input one, the main feature of a boost inverter is that it generates an AC output voltage larger than the DC input one by properly determining the duty cycle [32,33]. Most of the inverters use hard switching, by adding a simple series LC circuit, a zero voltage switching (ZVS) is achieved in a single-phase differential inverter [34].…”

Section: Differential Boost Invertermentioning

confidence: 99%

Active power decoupling for differential boost inverter with linear and nonlinear loads using inverse model approach

Gholizade‐Narm

Tahani

2022

The Journal of Engineering

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In this paper, a novel control system structure is introduced for generating a sinusoidal wave on the differential boost inverter terminals using inverse model approach.To address the high-frequency resonance issues, an active damping technique is proposed. Proportional-resonant controllers are designed for tracking and harmonic rejection. Pulling direct and constant current from photovoltaic panels as the DC source is essential in maximum power point tracking. Therefore, a decoupling controller is utilised to suppress current oscillations. An innovative combination of tracking controller, harmonic rejector, and decoupling controller is proposed in order to provide a sinusoidal voltage output for linear and nonlinear loads with low total harmonic distortion. The proposed method reduces the number of controllers by half compare to conventional methods. In addition to simulation, experimental results show the effectiveness of the proposed method. INTRODUCTIONNowadays, using green energy is a necessity for the world to reduce air pollution. Among all green energies, photovoltaic (PV) plays a crucial role. Lots of researches have been performed on the extracting maximum energy of photovoltaic panels, so-called maximum power point tracking (MPPT) [1][2][3][4][5]. The main output result of MPPT is to determine the value of a panel current and voltage to pull maximum energy. The output voltage and current of PVs are DC. Since many loads and grids are AC, therefore, to use this energy, applying a DC/AC inverter is unavoidable. On the other hand, the output voltage is low. Hence, it is necessary to be boosted. Two major approaches are used to convert the panel's DC voltage into usable AC. The first and most common approach benefits of two stages [6-8]. In the first stage, a DC/DC boost converter is used. This stage, not only boosts the voltage, but also performs decoupling task. In the second stage, the DC signal is inverted to AC. This AC wave may be connected to loads (Standalone: SA) or grid (Grid connected: GC) [6, 7, 9-14]. The second approach uses just one stage, in which boosting and inverting are accomplished in this stage, simultaneously. Several topologies are introduced This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Differential Boost Invertermentioning

confidence: 99%

Active power decoupling for differential boost inverter with linear and nonlinear loads using inverse model approach

Gholizade‐Narm

Tahani

2022

The Journal of Engineering

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“…The DC component values are equal for all phases, and it is cancelled by the differential connection, which is responsible for the voltage stress, while the AC component appearing on the output voltage of each converter are combined to create the sinusoidal AC voltage of the inverter. The diverse characteristics of the DC-DC converters give rise to many differential inverters as previously shown [83][84][85][86][87][88][89][90][91][92][93]. Two-stage voltage source inverters (VSI) can be implemented using both single-input and multi-input configurations.…”

Section: Three-phase Differential Invertermentioning

confidence: 99%

Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications

et al. 2020

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Microinverters are an essential part of the photovoltaic (PV) industry with significant exponential prevalence in new PV module architectures. However, electrolyte capacitors used to decouple double line frequency make the single-phase microinverters topologies the slightest unit in this promising industry. Three-phase microinverter topologies are the new trend in this industry because they do not have double-line frequency problems and they do not need the use of electrolyte capacitors. Moreover, these topologies can provide additional features such as four-wire operation. This paper presents a detailed discussion of the strong points of three-phase microinverters compared to single-phase counterparts. The developed topologies of three-phase microinverters are presented and evaluated based on a new classification based on the simplest topologies among dozens of existing inverters. Moreover, the paper considers the required standardized features of PV, grid, and the microinverter topology. These features have been classified as mandatory and essential. Examples of the considered features for classifications are Distributed Maximum Power Point Tracking (DMPPT), voltage boosting gain, and four-wire operation. The developed classification is used to identify the merits and demerits of the classified inverter topologies. Finally, a recommendation is given based on the classified features, chosen inverter topologies, and associated features.

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“…Alternatively, an impressive inverter topology based on buck, boost, or buck-boost DC-DC modules is presented and known as differential inverter. It shows noteworthy success in the power electronics industry due to their modularity, single-stage, and bidirectional power conversion with step-up/down ability [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29]. Further, unlike the abovementioned single-stage inverter topologies, differential inverters provide galvanic isolation between source and load by integrating small HFT.…”

Section: Introductionmentioning

confidence: 99%

“…The control has been implemented by sliding mode theory. Later, single, and three-phase differential inverters based on boost, buck, buck-boost, Cuk, SEPIC and flyback DC-DC modules have been presented extensively in literature following the same approach [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29].…”

Section: Introductionmentioning

confidence: 99%

Differential Inverters: A General Design Procedure Integrating a Novel Power Losses Modeling Approach for Utilized DC-DC Modules at Different Modulation Schemes

Shawky

Aly²,

Rodríguez³

2023

IEEE Access

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Differential inverters develop the PWM of internal DC-DC modules by correlating fundamental frequency of load with high switching frequency to maintain inherent characteristic operation and achieve pure higher/lower AC output voltage with smaller size. However, no generalized design method applicable for many DC-DC modules topologies has been demonstrated up till now, to realize efficient differential inverter with accurate power loss prediction. Consequently, a generic design process utilizing one parameter (modulation index gain) as well as new power losses modeling for all elements, such as switching devices, inductors, capacitors, and extra, are proposed in this paper. Novel decoupling between both operational frequencies through a two-stage calculation algorithm is the main attractive feature where, all losses are calculated based on the switching frequency of DC-DC modules then all losses are averaged accordingly over fundamental frequency. Doing this obtains RMS currents in terms of actual duty cycle and other parameters without adding complex mathematics at various PWM schemes, such as SVMS, CMS and DMS. The proposed work is simultaneously employed for many DC-DC modules topologies and verified in simulation and experiments using 0.7kW 50kHz isolated SEPIC-based DC-DC modules, as a case study. The error into actual duty cycle is decreased from 5.19% to 2.47% in the case of CMS at different power ratings. Further, it is reduced to 2.64% and 1.86% for SVMS and DMS, respectively. Finally, smart foretelling of power loss in each element of differential inverter is considered crucial for future efficiency improvement.

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Zero voltage switching differential inverters

Cited by 10 publications

References 13 publications

Active power decoupling for differential boost inverter with linear and nonlinear loads using inverse model approach

Active power decoupling for differential boost inverter with linear and nonlinear loads using inverse model approach

Classification of Three-Phase Grid-Tied Microinverters in Photovoltaic Applications

Differential Inverters: A General Design Procedure Integrating a Novel Power Losses Modeling Approach for Utilized DC-DC Modules at Different Modulation Schemes

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