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A new switched capacitor (SC) converter for powering miniature sensor systems with wide load current and output voltage ranges is proposed in this paper. By adopting a multiple-ratio SC stage and reconfigurable stage interconnect scheme, the proposed converter offers fine granularity of conversion ratios, which improves efficiency for light load operation. The multiple-leaf structure for switch size...
This paper presents comparison of GaN based switched-tank converter (STC) and traditional cascaded voltage divider (CVD) dc-dc converter for data center applications. The operation principle of two kinds of converters are presented. And simulations with Saber are both conducted to verify the proposed comparison, respectively. The system volume and efficiency are fully compared via GaN based device...
This paper presents a flyback converter based partial power processing structure for battery energy storage system (BESS). It combines both of the battery balancing functionality and power stage regulation functionality into one system. The proposed BESS only have one control variable which is the common duty cycle for all the flyback converters. It is used for the voltage or current regulation. There...
A novel isolated high step-up gain DC-DC conversion system for HVDC grid-connected PV power generation applications is proposed in this paper. The proposed system has a distributed MPPT and centralized step-up DC-DC configuration. By employing distributed MPPT converter, high power losses caused by partial shading of the PV arrays can be reduced significantly. Modular scheme is adopted for the centralized...
In this paper, the essential reason of causing the dual-side reactive currents in the isolated dual active bridge (DAB) DC-DC converter is revealed. It is because that the output voltages of the two H-bridge converters of the DAB converter can not keep their polarities the same as the inductor current all the time. The constraint between the two inner phase shifts and the outer phase shift is determined...
This paper reports on the design, control and modelling of a novel Multi-Input-Multi-Output Boost Converter topology. The converter hub can integrate renewable energy sources such as wind turbines, photovoltaic arrays, fuel cells, etc. for provision of different output voltage levels. The advantage of energy sources integration is that the required output voltage levels could be made up from a range...
In recent years, wireless sensor network technique develops rapidly, but its operation life is still limited by the energy storage element. Thus, if ambient energy can be harvested to supply the sensors, the operation life can be increased and the cost can be reduced. A boost converter for indoor photovoltaic energy harvesting with low power consumption is proposed in this work. For harvesting energy...
This paper analyzes the performance of three different topologies namely parallel, serial and variable-structure circuit of switched-diode-capacitor voltage accumulator (SDCVA). The converters are modelled in MATLAB/Simulink environment. Simulation is carried out to investigate the performance of the converters and the results are discussed. The optimum topology is identified based on the voltage...
This work introduces and discusses the issues of several common startup techniques for boost dc-dc converters. Moreover, basic operating principle of boost converters and three kinds of startup techniques will be briefly introduced in this work, and then an improved method is presented. The mathematical models of two chosen startup methods are built, and MATLAB simulation is used for comparison. In...
This paper presents a differential current compensation technique for partially shaded PV string. The proposed technique integrates an input parallel output series (IPOS) configuration of DC-DC flyback converters with distributed digital voltage mode control. PV modules in the string are interfaced with IPOS configuration of flyback converters. Each dedicated converter is regulated at the MPP voltage...
The paper proposes a two input Switched Inductor Hybrid Buck-SEPIC DC-DC converter (TIHBSC) topology, for Low Voltage DC-grid (LVDG) applications. The projected topology is capable of providing extra bucking with one source. On account of excessive stepping down of the input dc voltage the converter uses additional energy storage components and hence it belongs to fifth order family. Power flow is...
This paper aims at design and implementation of light weight, smaller size, highly efficient and reliable single output DC-DC converter for defence application. To achieve miniaturization of the converter high switching frequency is selected, which in turn reduces the mass, size of magnetic and output filter components‥ To overcome the limitation of 50% duty cycle in auxiliary winding reset forward...
This paper describes design and development of Pulsed Power DC-DC converter called Pulsed Power Supply Unit for Transmit/Receive Integrated Module of L-band SAR. This paper presents topology selection, design challenges and use of bias winding for feedback. Novel feature of this design is that by using bias winding for feedback overall efficiency is improved and excellent regulation of Tx outputs,...
Applications of the multi-input converters are becoming popular due to their conformity to renewable energy systems. This paper proposes a new topology of double-input boost converters with continuous input current, which is intended to be used for renewable power sources. The topology is derived from two dc-dc converter configurations: boost dc-dc converter and Y-source dc-dc converter. In the proposed...
This paper proposes the SPG (Solar Photovoltaic Generator) fed dual output boost converter utilized for water pumping employing a switched reluctance (SR) motor. The dual output boost converter is used here to provide the balanced voltages to a midpoint converter which is used as a power converter for SRM drive. The control algorithm eliminates the startup problem associated with a midpoint converter...
In this work, several dc-dc converter topologies are examined for GaN-based, single-input, multi-output, large step-down applications; namely 200V∼400V dc distribution systems in modern defense, aeronautical, and datacenter industries. Many critical loads in these larger systems are supplied by 48V, 24V, 12V, or lower voltage sources, requiring a significant step-down of the main dc bus voltage. Due...
A multilevel soft-switching DC-DC converter with only one resonant cell for medium voltage conversion is proposed in this paper. Two control strategies for the converter are analyzed and compared. For the proposed converter, all dc capacitors can achieve voltage self-balanced under open loop control. All switches and diodes operate in soft-switching condition without sacrificing reliability. Finally,...
Multi-input converters (MIC) are gaining more popularity due to its capability for integrating multiple sources. A MIC diversifies the energy from multiple sources of different I–V characteristics in a single stage. Energy diversification from integrated sources in regulated manner is very challenging and being researched in recent years. In this paper a power management and control scheme for multi-input...
Z-source inverters eliminate the need for front-end DC-DC boost converters in applications with limited DC voltage such as solar PV, fuel cell. Quasi Z-source inverters offer advantages over Z-source inverter, such as continuous source current and lower component ratings. In this paper, switching table based Direct Torque Control (DTC) of induction motor fed by quasi Z-Source Inverter (qZSI) is presented...
To interconnect solar photovoltaic (PV) with the single phase grid, DC/AC inverters are used as interface. For tracking maximum power from each solar PV string, DC/DC converters are connected between solar PV strings and inverters. This ensures each strings operates at its maximum power output irrespective of variation in solar radiation among different strings. Conventionally, DC-DC converter used...
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