DC Converter Research Articles

A Closed-Loop Using Sampled-Data Controller for a New Nonisolated High-Gain DC–DC Converter

A Closed-Loop Using Sampled-Data Controller for a New Nonisolated High-Gain DC–DC Converter

A ZVS High Step-Up DC–DC Converter With Three-Winding Coupled-Inductor Assisted Voltage Multiplier Cell Suitable for Renewable Energy Systems

A ZVS High Step-Up DC–DC Converter With Three-Winding Coupled-Inductor Assisted Voltage Multiplier Cell Suitable for Renewable Energy Systems

A Novel Three-Port High-Gain DC–DC Converter for PV–Battery Stand-Alone System With Reduced Device Count

A Novel Three-Port High-Gain DC–DC Converter for PV–Battery Stand-Alone System With Reduced Device Count

A General Method for Analyzing Single-Switch Step- Up DC–DC Converters With Switched-Capacitor Cells and an Output Inductor

A General Method for Analyzing Single-Switch Step- Up DC–DC Converters With Switched-Capacitor Cells and an Output Inductor

New Integrated DC–DC Conversion System for Electric Vehicles

New Integrated DC–DC Conversion System for Electric Vehicles

Sliding Mode control of the of the Two Phases Interleaved DC DC Converter

Sliding Mode control of the of the Two Phases Interleaved DC DC Converter

A novel stochastic framework for optimal scheduling of smart cities as an energy hub

AbstractSmart cities consist of various energy systems and services that must be optimally scheduled to improve energy efficiency and reduce operation costs. The smart city layout comprises a power distribution system, a thermal energy system, a water system, and the private and public transportation systems. Additionally, several new technologies such as reconfiguration, regenerative braking energy of the metro, etc. are considered. This study is one of the first to consider all these technologies together in a smart city. The proposed power distribution system is a grid‐connected hybrid AC–DC microgrid. The biogeography‐based optimization algorithm was utilized to seek the best solution for scheduling micro‐turbines, fuel cells, heat pumps, desalination units, energy storage systems, AC–DC converters, purchasing power from the upstream, distributed energy resources, and transferring power amongst electric vehicle parking stations and metro for the next day. Also, the reduced unscented transformation layout was used to capture the system's uncertainty. The suggested layout is implemented on an enhanced IEEE 33‐bus test system to show the efficiency of the suggested method. The results show that costs and environmental pollution are reduced. By comparing the proposed smart city with other studies, the efficiency and completeness of the proposed smart city are shown.

Design and analysis of soft-switching isolated step-up/down DC–DC converter for fuel cell vehicles and EV battery charging applications

ABSTRACT With the increasing adoption of non-conventional energy sources, there is a significant demand for DC energy conversion systems as they play a crucial role in integrating power sources and loads that operate at different voltage levels. In this paper, a novel DC–DC converter topology is presented, which can efficiently perform Buck-boost operation with minimal duty cycle operation, making it an attractive option for DC energy conversion applications. Furthermore, its switching voltage stress is less than the voltage present at the output, allowing the use of low power rated devices. Additionally, the topology contains isolation between the load and source, which prevents circulating currents and protects the source from load harmonics. The proposed converter has the ability to achieve soft switching without using any extra circuitry. Moreover, the presented converter is evaluated against recently developed topologies in terms of active/passive components, gain, efficiency, and switching stress. Closed-loop analysis is done for the proposed converter using small-signal modeling. The converter is tested by subjecting it to a sudden step change at the input voltage from 20 V to 40 V in boost condition while maintaining a constant output voltage of 240 V. Additionally, load disturbances are introduced to assess the system’s robustness in closed-loop operation. In the laboratory, A 100-W prototype of the presented converter is built, which gives an efficiency of 95% at the rated load condition.

Design and Evaluation of Galvanic Isolation for Full Bridge DC to DC Converter

Design and Evaluation of Galvanic Isolation for Full Bridge DC to DC Converter

Design and analysis of an interleaved step-up DC–DC converter with enhanced characteristics

In this paper, an interleaved DC–DC step-up converter with improved characteristics based on a voltage multiplier rectifier is presented. The proposed converter is presented and analyzed for two different operating duty regions including operating region 1 (0 < D ≤ 0.5), and operating region 2 (0.5 ≤ D < 1). This converter can be used in various applications such as energy storage, electric vehicles, and renewable energy systems. This converter is composed of two stages: an interleaved boost stage and a voltage multiplier rectifier stage, which collectively forms its general structure. The interleaved boost stage is a type of two-phase boost converter that transforms the input DC voltage into a high-frequency AC square waveform. This waveform can be readily filtered using smaller capacitors. The square-shaped voltage waveform from the interleaved boost stage is rectified and converted to a high DC voltage by the Voltage Multiplier Rectifier (VMR) stage. The operating regions, the evaluation of the steady-state condition, the voltage gain of the proposed converter's parasitic and ideal models as well as its losses and efficiency analysis have been evaluated. The proposed converter has an efficiency of 97% at the output power of 150 W. The proposed converter is simulated to convert a voltage of 25–159.5 V and to validate the mathematical relationships and simulation results, a laboratory prototype has been developed. The simulation and experimental results show the precision of the performance of the proposed interleaved boost converter.

35 kW isolated fuel-cell DC–DC converter design based on PWM resonant converter with hybrid switch structure

35 kW isolated fuel-cell DC–DC converter design based on PWM resonant converter with hybrid switch structure

Time‐optimal finite control set model predictive control of non‐isolated DC–DC converters

Time‐optimal finite control set model predictive control of non‐isolated DC–DC converters

Enhancing RF energy harvesting in smart cities with two port MIMO-UWB antenna design using machine learning algorithms

Abstract This work presents the two port ultra-wide band MIMO antenna with novel isolation structure and dual band RF Rectifier for 3.3 GHz and 4.65 GHz frequencies for RF energy harvesting applications. The anticipated antenna is systematically examined within the ultra-wideband (UWB) range from 3.1 GHz to 10.6 GHz design frequency with four different steps: Antenna 1, Antenna 2, Antenna 3 and Antenna 4 (optimal design) are chosen for comprehensive study. A unique isolation structure was developed between two identical elements separated by 10 mm, resulting in an enhanced isolation of −23.5 dB at 3.15 GHz, −27 dB at 5.8 GHz, −28 dB at 9.26 GHz and greater than −34 dB at 7.5 GHz. The suggested antenna resonates at UWB band and have fractional bandwidth of 118.66 % and a peak gain of 4.1 dB at 3.15 GHz, 3.68 dB at 5.8 GHz, 6.4 dB at 7.5 GHz and 3.2 dB at 9.26 GHz has been obtained. Radiation efficiencies of 92.5 %, 95 %, 90 % and 84.5 % at 3.15 GHz, 5.8 GHz, 7.5 GHz and 9.26 GHz were obtained respectively. The recommended MIMO performance is simulated using HFSS in terms of ECC, DG, MEG and CCL. The results adhere to specified requirements and confirmed by experimentation. An HFSS simulated dataset of reflection coefficient is used as input for the various ML algorithms namely, Support Vector Machine (SVM), Ensemble, k-nearest neighbors’ algorithm (KNN) and Gaussian Process Regression (GPR) models are trained with 80 % of the data and testing with 20 % of the data. The test results are compared and corresponding performance values of MAE, RMSE, MSE &amp; R 2 are 0.00029, 0.00197, 3.87e−6 and 1.0 validation results and corresponding test results are 0.00031, 0.00229, 5.20e−6 and 0.999. Finally, the proposed dual band rectifier with a shorted stub is tested for harvesting applications at 3.3 GHz and 4.65 GHz frequency and it attained RF to DC conversion efficiencies of 69 % and 55.40 % respectively.

Evaluation and improvement of wireless charging system with DC–DC converter for EV employing the fuzzy logic controller

Evaluation and improvement of wireless charging system with DC–DC converter for EV employing the fuzzy logic controller

PARTICLE SWARM OPTIMIZATION AND CFD ANALYSIS OF A HEAT SINK FOR FORCED CONVECTIVE COOLING OF A DC/AC INVERTER

Power inverters play a crucial role in converting DC voltage and current to AC voltage and current. Its efficient operation relies on effective thermal management of the semiconductor devices, such as the IRF 3205 MOSFET chip which facilitate the switching operations to prevent thermo-mechanical stress that could to failure. This research developed and optimize a heat sink for an IRF 3205 MOSFET chip in a 3.5 KVA power inverter, using the Particle Swarm Optimization technique and experimented with a 3.5 KVA 24 V power inverter operating a 1.5HP air-conditioning unit. The heat sink geometry has 26 fins, 4 mm fin thickness, 40 mm fin height, 3 mm fin spacing, 2 mm fin base thickness, 179 mm length, 80 mm width and a thermal resistance of 60.75 °C/W. The thermal performance was evaluated using ANSYS Computational Fluid Dynamics (CFD) and results showed maximum base temperature of 65.85°C and experimental temperature of 64°C after two hours of steady operation dissipating heat of 45W. The results from both numerical and experimental data demonstrate the effectiveness of the optimized heat sink in maintaining the chip's temperature below its maximum working threshold of 170°C.

Impedance Analysis of Digital Control Based DC–DC Converter for Both Single and Dual Control Loop

Impedance Analysis of Digital Control Based DC–DC Converter for Both Single and Dual Control Loop

An efficient interleaved Boost DC–DC converter with high-voltage gain based on switched capacitor

An efficient interleaved Boost DC–DC converter with high-voltage gain based on switched capacitor

Penggunaan Prototype DC Converter Untuk Peningkatan Kinerja Panel Surya 1000 Watt

Solar power plants (PLTS) are power plants that convert solar energy into environmentally friendly electrical energy. Reducing dependence on fossil fuel electricity and the increasingly expensive price of PLN electricity so that there is a need for alternative sources of renewable electricity, and the obstacle is the large investment in PLTS, including systems on-grid, off-grid, and hybrid. The use of sunlight in solar power plants is still limited to approximately 5 hours, the time range is from 10.00 to 14.30 WIB. To achieve the goal of extending the maximum period for collecting renewable energy, support can be provided by designing a prototype DC Converter, The design to be implemented uses the R&amp;D research method. This research method is carried out to produce a product, test the effectiveness of the product, and perfect the product according to the criteria for creating a new product through different stages. The DC converter prototype functions as a replacement solar Charge Controller (SCC) is low cost and its performance produces electricity from 08:00 to 16:00 WIB. The Inverter is 12V 1000 watts and the output voltage of a 270Wp solar panel is around 33V DC, so the DC conversion function will reduce the output voltage of the solar panel to 12V DC and the load used by 30%. Installed load 240 watts or 0.24 kWh. can be fully lit for an average of 7 hours. By using a DC converter prototype, savings can be achieved assuming the selling price of PLN electricity is Rp. 1,444.70,-/kWH is Rp. 72,812.88/month

A new soft‐switching high step‐up DC–DC converter with low voltage stress

AbstractThis paper proposes a new high step‐up DC–DC converter with zero input current ripple for renewable energy sources applications, such as fuel cells. In this topology, a coupled inductor and a multiplier cell are used to achieve high voltage gains. The power switch in this proposed circuit turns on under zero voltage switching conditions. An active switch limits the maximum voltage stress across the main power switch. Moreover, all circuit diodes of the converter turn off without a reverse recovery problem. A detailed analysis of a high‐gain step‐up DC–DC converter is studied along with improved efficiency. The ripple cancellation of the input stage of the converter is done by adding an input inductor and capacitor. By including the parasitic elements, an approximate loss analysis was performed in PSIM and found the maximum efficiency of ∼96% in simulation and ∼94% in hardware for 200 W power level design for 30 V input voltage. Later on, the converter laboratory hardware prototype can be developed with selected parameters, and finally, experimental results have been used to validate the properties of the converter.

Modeling and analysis of digital current‐mode controlled single‐inductor dual‐output DC–DC converter with different PWM modulation modes

SummaryCurrent‐mode control is extensively used in dc–dc converters as the merits of fast transient performance, simple control loop, and elimination of right‐half‐plane zeros for boost‐type dc–dc converters. In single‐inductor multiple‐output (SIMO) dc–dc converter, the inductor current would present different trends under different circuit parameters. Therefore, the control logic changes for different inductor current trends, and the corresponding modulations are absolutely different. In this paper, a digital current‐mode control technology for SIMO dc–dc converter is proposed to expend the convenience of current‐mode control with different inductor trends. Choosing continuous conduction mode (CCM) single‐inductor dual‐output (SIDO) dc–dc converter as the research object, the principles are analyzed under different pulse width modulation modes, and the corresponding control algorithms are derived. Moreover, the discrete iterative map model is established to analyze the stability of input and output voltages varying. The results show that not only the digital current‐mode controlled SIDO buck converter has fast load transient response and small cross‐regulation but also the input and output voltages will not affect the stability in the leading edge modulation, which is different from the corresponding analog current‐mode control technology. Finally, the experimental results verify the correctness of the theoretical analysis.