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Switched-capacitor (SC) DC-DC converters have gained attention based on their ability to offer a low-cost high-efficiency power conversion, and allow a thin and compact module packaging [1]. However, the SC DC-DC converter offers high efficiency only in a limited input/output voltage range, since it is inherently based on a discrete conversion ratio, which is different from an inductor-based DC-DC...
This paper analyses the performance of photovoltaic (PV) system in different climatic conditions and proposes an optimal topology to improve the tracking efficiency conditions. The maximum operating point is determined by the intersection point of its characteristic curves which is not always same due to losses in the system. DC-DC converters together with maximum power point tracking systems (MPPT)...
This paper explains modelling design and control of a bidirectional dc-dc converter for EV applications. The provision for energy regeneration is achieved by using half bridge non isolated dc-dc converter. Small signal modelling of the system is done by the state space averaging technique. A PI controller has been implemented for the speed control. The soft switching technique has also been incorporated...
In recent time GaN FETs have started its way on the electronics market. As the parameters of this type of semiconductors is superior to the classic Si and SiC elements the use of classic topologies like boost converter got the opportunity to set higher frequencies, better efficiency and therefore better power density. Better efficiency gives an advance in pay-off time as there is smaller amount of...
Partially shaded problem in multi-string PV panels is a major challenge because it reduces the value of generated power from PV panel. In this paper, a new cascaded high step-up DC-DC-AC converter based on SEPIC converter is proposed for partially shaded multi-string PV panels. To solve the challenge of partially shaded in PV system, a SEPIC dc-dc converter is connected for each string and the duty...
A transformer-less DC-DC Modular Multi-level Converter (DC-DC-MMC) topology based on H-bridge cells is proposed in this paper. The suggested DC-DC-MMC can be used to either control the power flow in a HVdc grid or interconnect HVdc lines with different voltage levels. Branch energy and current control loops are presented as well as a cell capacitor voltage balancing strategy. Finally, the operation...
This paper presents a multiport galvanically isolated LLC resonant DC-DC converter suitable for DC applications. A three-port structure is analyzed, with full bidirectional power flow capabilities, simple control and behavior similar to that expected from a DC transformer. Each port is equipped with half-bridge modules accompanied with tuned resonant tank, partly realized with elements of a multi-winding...
In this paper, two types of isolated converter topologies for the implementation of the galvanic isolation of a low-voltage DC network is discussed. Advantages and problems of the topologies are compared and a selection for the suitable topology for two conversion ratios, 1:1 and 2:1 is carried out. The selection is carried out by comparing the life-cycle costs of the converters if used in the low...
In this paper, a three-port soft switching DC-DC converter based on the bidirectional version of the three-state switching cell (3SSC) and dual active bridge (DAB). The converter features high voltage gain and current reduced stress in the converter primary switches. The soft switching curves are presented, showing that all active switches are designed to operate in Zero Voltage Switching (ZVS), depending...
The continuous increased installation of solar photovoltaic (PV) systems have made possible the interest in their development, oriented to reach a high efficiency system. There are four traditional configurations of grid-connected PV systems depending of the size of the plant,each of them has different efficiency values due to the inherent associated problems. The large-scale PV plants have problems...
This paper proposes an association of two ZVS-PWM three-phase current-fed push-pull DC-DC converters. The ZVS-PWM three-phase current fed push-pull DC-DC converter is already known in literature and can be used to reduce the volume, weight and consequently the cost in many applications when compared to single phase topologies. The proposed association allows the division of the input current between...
In this paper a novel multi-purpose converter for electric vehicles (EVs) is proposed. This topology, optimized for a full electric drive, satisfies propulsion requirements and allows single phase as well as three-phase AC charging. As compared with the onboard integrated chargers on the market today, this topology enables significant cost, weight and volume reductions. The proposed topology is theoretically...
This paper presents an electrorefining plant operating with a photovoltaic dc-dc direct power interface. Different PV dc-dc power configurations are presented as alternative to partially feed the electrorefining process. The proposed power configuration is based on a multi-string dc-dc conversion system to achieve maximum power point tracking on each string, the electrorefining plant is fed through...
We introduce a fully integrated step-down self-oscillating switched-capacitor DC-DC converter that delivers near-threshold (NT) output voltages. The converter is built in 28 nm UTBB FD-SOI and occupies 0.0104 mm2. Back-gate biasing is utilized to increase the load power range. Measurements show a peak efficiency of 87%, self start-up capability, and a minimum efficiency of 75% for 79 nW to 200 μW...
The issues of a single-inductor multiple-output DC-DC converter were studied. Poor cross regulation, low efficiency, low current capability, and large ripple are the major disadvantages of the single-inductor multiple-output converter compared with a conventional DC-DC converter. Several studies to overcome these problems are introduced in this paper.
This paper presents a hardware based comparison of buck-boost converter topologies in MPPT applications. Buck-boost converters perform perfectly compared with the other DC-DC converter topologies without voltage conversion limitations. Comparative analyzes of classical buck-boost, sepic and cúk converters are made in terms of tracking capability, number of components that are used for power stage...
Quazi Z-Source inverter (qZSI) is a promising inverter topology that can buck or boost input voltage without a DC-DC converter and hence can be used in transformerless configuration. This is a high efficiency solution because of single stage processing and conversion. In this paper a novel modified qZSI topology is proposed and new modulation technique is presented to reduce common mode leakage current...
This paper proposes the use of a transformer-less DC-DC Modular Multilevel Converter (MMC) topology, based on cascaded H-bridge converters, for power flow control in High Voltage Direct Current (HVDC) grids used to connect off-shore wind power plants to on-shore grids. An energy based approach is used to regulate the DC voltage of H-bridge modules. Results for the operation of the DC-DC MMC supplying...
This paper presents a fully integrated capacitive DC-DC converter with a wide input voltage range. The folding Dickson converter is used to implement four discrete voltage conversion ratios, capable of operating over a wide input voltage range. A subconverter is added, enabling four additional voltage conversion ratios, improving the input voltage resolution from Vout to 1 Vout. This way, the extra...
In this paper, a new DC-DC switched-capacitor converter with the potential of output voltage regulation is presented for photovoltaic applications. The proposed topology consists of an extended high voltage gain converter along with a buck converter. The extended high voltage gain converter is operated with a fixed conversion gain whereas the buck converter is controlled to do the maximum power point...
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