DC Converter Research Articles

A non‐isolated single‐input dual‐output DC–DC boost converter with high‐voltage gain

AbstractThis paper presents a new structure of a high step‐up DC–DC converter. The proposed converter has one input and two outputs with different voltage levels, suitable for applications that require multiple voltage levels such as photovoltaic systems, electric vehicles and DC microgrids. The proposed converter is expandable to more outputs and has a higher voltage conversion ratio compared to similar converters. The operational modes of the proposed converter are investigated and the conversion ratio of the converter is obtained. Additionally, small‐signal equations of the converter are derived, and using state‐space matrices, transfer functions of the converter are obtained and the controller is designed. Also, the proposed converter is compared with similar converters and power losses equations of the converter are derived. To investigate the converter's performance, simulations are done using MATLAB/Simulink software. Moreover, to validate the theoretical analysis, a laboratory prototype is implemented. The obtained results confirm the operation of the proposed converter.

Osprey optimization algorithm for MPPT of PV system with forward DC to DC converter under partial shading conditions

Abstract Electric power is required anywhere for multiple purposes to do various tasks. Production of electricity from renewable sources such solar energy is feasible solution for many problems. Photovoltaic modules are generally used to produce electricity through solar irradiance. However, a maximum power point tracking device (MPPTD) must be incorporated to Photovoltaic system to ensure its maximum utilization or best efficiency. A forward DC to DC circuit is selected to work as MPPTD in this paper. Many conventional algorithms including incremental conductance, perturb & observe are available to work effectively for MPPTD under uniform solar irradiances. However, non-uniform irradiances will be received by Photovoltaic modules where many are connected to form a power generation system due to trees, shading, dust, birds, clouds, etc Such phenomenon drags the system into Partial Shading Condition (PSC). Under PSC, conventional algorithms cannot identify the best location to harvest more energy. Hence, an optimization technique is required to operate Photovoltaic system at its outfit utilization during PSC. An optimization technique namely ‘Osprey Optimization Algorithm (OOA)’ is developed in this paper on MPPTD to harvest more energy during PSC. The comparison among OOA, Grey Wolf Optimization (GWO), Modified Invasive Weed Optimization (MIWO) and Whale Optimization Algorithm (WOA) is also included in this paper. The Hardware—in the—Loop is establish by using OPAL-RT technology to collect various results for presenting analysis under different operating conditions.

Design of 2.4 GHz RF to 1.33 V DC Conversion Circuit for Energy Harvesting

This paper presents the design of a circuit for energy harvesting that converts 2.4 GHz radio frequency (RF) to 1.33 V DC. The demand for self-sustainable low-power electronic devices requires power to be supplied continuously. The battery has a life circle and is not able to sustain for a long time. Therefore, radiofrequency (RF) is one of the energy sources that can be obtained at any desired voltage for no cost and is widely available. A voltage regulator, charge pump, and rectifier make up the suggested circuit. All circuits are designed using 0.13-μm CMOS process. To convert the antenna's 2.4 GHz RF voltage to DC voltage, an RF rectifier is needed. After the rectifier's DC voltage is increased by the charge pump, the voltage regulator regulates the DC output voltage to the intended output value. At the voltage regulator, the desired DC output voltage will be controlled. The simulation's outcome demonstrates that an RF-DC rectifier circuit operating at 2.4 GHz frequency and a 10 kΩ load resistor may provide a DC output voltage of 78.51 mV. Next, the charge pump increased the rectifier's output voltage to 1.39 V. Lastly, the voltage regulator controlled the charge pump's output to produce a steady DC output of 1.33 V.

A Non-Linear Control Technique for Single Phase qZSI

Quasi-Z-source inverters, or qZSIs, are a common type of inverter used in transformer-less systems because they can boost or buck input voltage without a requirement for a DC- DC converter. A transformer is not necessary for the qZSI's single-stage conversion to operate as a grid-tie converter. In transformer-less designs common mode current is the major problem, though, because there is no galvanic isolation. To reduce the common mode current, this article offers controlling the qZSI using a modified pulse width modulation (PWM) approach two additional semiconductor switches. The developed methodology provides a practical means of integrating solar photovoltaic systems into the grid. what the recommended topology's attributes should be: 1)It uses the phase-leg shoot through to boost the direct current and voltage to required level by eliminating the need for a second dc-dc converter. 2) Freewheeling is achieved while removing PWM deadtime by employing extra linked switches.

Multiple‐Input and Multiple‐Output–Based Cascaded Boost Hybrid Interlink Converter

ABSTRACTThe multiple‐input and multiple‐output (MIMO) DC–DC converters offer various advantages such as improved efficiency and reduced component count. However, the preference of these converters over other types of converters is dependent on the specific application and requirements. Various types of boost‐derived MIMO DC–DC converters are discussed in the literature. However, these converters are either nonisolated or isolated types. In the paper, a MIMO‐based cascaded boost hybrid interlink converter (CBHIC) has been proposed. The proposed converter includes four DC–DC boost converters that are supplied power by two input DC sources. The boosted DC output of these converters can be used independently or in a cascaded manner depending upon the requirement of the load. Further, the cascaded action of these four boost converters leads to the production of two high‐frequency AC outputs. By using bridge rectifiers and high‐frequency transformers, high‐frequency AC voltages are converted into DC. Therefore, two isolated DC output voltages can be achieved using CBHIC. The complementary operation of the cascaded boost converters results in reduction of source current ripples. The design, operating modes, and performance evaluation of the proposed CBHIC have been included in the paper. To validate the efficacy of the proposed CBHIC, a lab prototype of 400 W is prepared. The rms value of high‐frequency AC output voltage at each is isolated port is 141 V. The CBHIC exhibits an efficiency of 94.3 at 400 W. The operation of the converter during voltage control mode is further explored and its dynamic response is studies with the help of experimental results. The obtained simulation and experimental results validate the effectiveness of the proposed converter.

High gain DC–DC converter based on magnetic integration

High gain DC–DC converter based on magnetic integration

Analysis of Control Strategy Based on P&G Algorithm for the Switching Component of Wireless Solar Power Transfer

Previous researchers have studied wireless power transfer (WPT), while the current study focused on converting DC voltage to AC voltage on the transmitting coil and transferring it to the receiving coil. Previous studies did not discuss the control technique to drive the switching component on the converter circuit, especially the change controller in DC voltage and current affecting the WPT performance. This paper discussed a control strategy based on the P&O algorithm for driving MOSFETs on the half H-bridge inverter of a wireless solar power transfer (WSPT) system. This system is constructed by PV modules as the main DC voltage source, a control strategy based on the perturb and observe (P&O) algorithm, a half H-bridge inverter, and a transmitting and receiving circuit. The WSPT system was modelled using MATLAB SIMULINK with various solar irradiance, and its performance was assessed. The results show that the change in the total output voltage and power of PV modules can be controlled by the P&O algorithm as the signal input of the PWM generator applied to drive the MOSFETs. There are no transient values of voltage waveform on the transmitting and receiving circuit when the transient total output voltage of PV modules occurs. It indicates that the P&O algorithm can effectively manage the PWM generator for its input signal, including the total output voltage and current produced by PV modules.

High Step-Up Three-Port DC–DC Converter With Few Limitations in Performance Suitable for Stand-Alone Renewable Energy Applications

High Step-Up Three-Port DC–DC Converter With Few Limitations in Performance Suitable for Stand-Alone Renewable Energy Applications

An Isolated DC–DC Converter Using a Cross-Coupled Shoot-Through-Free Class-D Oscillator With Low EMI Emissions

An Isolated DC–DC Converter Using a Cross-Coupled Shoot-Through-Free Class-D Oscillator With Low EMI Emissions

Overview of Main Electrolyzer Technologies and Power Electronic Converter Topologies for Enabling Hydrogen Production Through Water Electrolysis

ABSTRACTThis manuscript offers an in‐depth exploration of electrolysis, focusing on the various types of electrolyzers and providing a detailed analysis of their respective advantages and disadvantages. Additionally, it presents a comprehensive review of DC–DC and AC–DC converters, highlighting their essential roles in green hydrogen production and explaining their functionality and applications in detail. Furthermore, the manuscript examines the diverse power electronic systems used in green hydrogen production, underscoring the crucial importance of converters. The investigation also covers effective strategies for integrating these technologies, with the goal of optimizing the green hydrogen production process. This study aims to significantly advance knowledge in sustainable technologies, emphasizing the pivotal role of power electronics in electrolysis, fostering the generation of renewable energy, and reinforcing the commitment to a greener and more sustainable future.

Predictive Synchronous Rectification Control Scheme for Resonant DC–DC Converters for Battery Charging and Telecom Application

Predictive Synchronous Rectification Control Scheme for Resonant DC–DC Converters for Battery Charging and Telecom Application

A Novel DC–DC Converter for Electrolyzer With Low Ripple and High Step Down

A Novel DC–DC Converter for Electrolyzer With Low Ripple and High Step Down

A Three-Switch AC–DC Converter With Buck/Boost Ability, Low Leakage Current, and Continuous Input/Output Currents

A Three-Switch AC–DC Converter With Buck/Boost Ability, Low Leakage Current, and Continuous Input/Output Currents

High Voltage Gain Three-Level DC–DC Converter With Switched-Capacitor Technique for DC Wind Farms

High Voltage Gain Three-Level DC–DC Converter With Switched-Capacitor Technique for DC Wind Farms

High-Voltage Wide Output Range Isolated DC–DC Converter for Micro-Newton Ion Thruster

High-Voltage Wide Output Range Isolated DC–DC Converter for Micro-Newton Ion Thruster

Extended Phase Shift Control of a Novel Bidirectional DC–DC Converter With Direct Power Transfer

Extended Phase Shift Control of a Novel Bidirectional DC–DC Converter With Direct Power Transfer

Data-Driven Modeling of DC–DC Power Converters

This article presents a data-driven methodology for modeling DC–DC power electronic converters. Using the proposed methodology, the dynamics of a converter can be captured, thereby eliminating the need for explicit theoretical modeling methods. This approach only requires the acquisition of fundamental measurements: currents through inductors and voltages across capacitors. The acquired data are used to construct a linear difference system, which is algebraically manipulated to form a state–space representation of the converter under analysis. Three DC–DC converter topologies were analyzed, and their resulting models were tested and compared with simulation data, yielding an average error deviation of approximately 2% for current signals and 4% for voltage signals, demonstrating precise tracking of the actual dynamics. The proposed data-driven methodology could simplify the implementation of adaptive control strategies in larger-scale solutions or in the interconnection of multiple converters.

Expandable Three-Port DC–DC Converter With Notable Properties and Without Effective Limitations Suitable for Off-Grid Applications

Expandable Three-Port DC–DC Converter With Notable Properties and Without Effective Limitations Suitable for Off-Grid Applications

Hybrid switched‐capacitor‐based boost DC–DC converter with reduced voltage stress

AbstractThis article presents the new hybrid switched‐capacitor (SC)‐based transformerless DC–DC converter with a high step‐up capability and common ground features. The proposed hybrid SC‐based converter provides low voltage stress across semiconductor devices to utilize MOSFETs with lower Rdson and low voltage ratings. In addition, the diodes in SC cells with low voltage stress can reduce the reverse recovery power loss of the converter. Thus, the overall efficiency of the proposed hybrid SC‐based converter can be increased. The converter circuit, operating principle, and design guidelines of the proposed hybrid SC‐based converter are discussed. To confirm the performance of the proposed hybrid SC‐based converter, a detailed comparison study with the conventional hybrid SC converter is also presented. Finally, a laboratory prototype with 200 W and 25 to 200 V is set up to verify the effectiveness of the proposed hybrid SC‐based converter.

Parametric correction in the control system of the electric propulsion of autonomous underwater vehicles affected by random inputs

The paper deals with the problem of controlling a DC propulsion motor of an autonomous underwater vehicle using a bidirectional non-isolated DC-DC converter. An automatic speed control system with a parametric controller was developed in the Matlab / Simulink package. To reduce energy conversion stages, dc-dc converters are often used to control dc motors AUV. The result of the work is an adaptive control system for the speed of the AUV propeller, which would provide high accuracy for a wide range of speeds and at the same time limit the maximum current and voltage at the armature. The indicators of the quality of performance in various modes of operation were determined, maps of the controller settings were compiled, and parametric correction was introduced. The operation of the system is analyzed and drawbacks are eliminated, such as voltage surges when switching from one speed to another, a decrease in overshoot and settling time. The performance of the system is analyzed under the conditions of random inputs from the propeller. The description of the laboratory stand for the study of the control system is given. A description of the laboratory study of the operation of the "DC converter—engine" system under conditions of random fluctuations in the moments on the motor shaft is given. It is shown that the proposed system has shown itself well under laboratory conditions and the experimental results are consistent with modeling in Matlab / Simulink.