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The symmetrical compensation is widely used in inductive power transfer (IPT) system due to the advantages of achieving good coupling coefficient when the coils are perfectly aligned and easy to design. This paper investigates a general tuning method for voltage-fed symmetrical higher-order resonant networks for achieving load-independent transconductance. With the proposed tuning method, a resonant...
This paper introduces a 97% efficiency medium voltage (MV) Solid State Transformer (SST) based on two-level single stage (TLSS) topology and 15 kV SiC MOSFETs. Series resonant converter (SRC) is implemented as the main stage and is identified as a current source (CS) SRC for the first time. Equivalent resonant frequency of the proposed CS-SRC is analyzed in both time domain and frequency domain. Resonant...
A control strategy to manage the circulating current content in a Modular Multilevel Converter in direct AC-AC topology is proposed in this article. The converter is connected in three-phase YDY configuration which forms a closed delta path for free current circulation while keeping outsider waveforms with low THD content. Circulating current correction becomes necessary face to any kind of unbalance...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
Contactless power transfer (CPT) is an emerging topic which relies in high frequency resonant inverters to transfer power from a transmitter to a physically separated receiver inductively. Capacitive compensations on both the primary and secondary sides of a loosely coupled transformer are usually employed in recent researches in order to enhance the power transfer capability and the system efficiency...
The dc-dc conversion will play an important role in multi-terminal dc networks and dc grids. This paper presents two isolated resonant modular multilevel converters (IRMMCs) to fulfill the large step-ratio conversion for medium voltage dc (MVDC) networks. The conventional resonant modular multilevel converters (RMMCs) suffer the common problems of non-isolation and high current stress, which are solved...
Inductive coupled power transfer (ICPT) is an emerging technology that may create new applications for wireless power charging. However, low efficiency is one of the main obstructing factors for promoting this technology. In this paper, a method of resonant frequency optimization based on resonant current calculation at the secondary side of the system is proposed to achieve higher efficiency. In...
In this paper, the design of a proportional resonant (PR) controller for the packed U cell (PUC) 5 level inverter is presented. The objective of the presented work is to present a better solution for current control in grid connected application of the investigated topology. A suitable LCL filter is designed along with the PR control scheme for grid connection. Simulation is performed in MATLAB®/Simulink...
This paper proposes a switched capacitor based non-isolated zero voltage switching (ZVS) bi-directional dc-dc converter. By implementing a switched capacitor loop, it can provide high step up and step down gain. The converter is operated in continuous current mode (CCM) mode where all the power transistors are soft switched by means of dedicated auxiliary resonant networks. Each network consists of...
Power electronic traction transformer (PETT) is an emerging technology for traction applications. LLC resonant converter is an attractive option for isolated DC/DC stage because of its high efficiency. However, there will be inevitable twice-line frequency ripple on the resonant current due to the singlephase power fluctuation. On the other hand, parameter mismatch between modules can result in power...
Inductive power transfer (IPT) is widely used for the contactless charging system. In an underwater environment, it's also a feasible way to the underwater vehicles for battery charging. In this paper, a novel design process of IPT system is implemented. Serial-serial (SS) topology is selected for the application due to the constant output voltage in a non-resonant state even with a various load....
An alternative implementation of asymmetric cascaded H-bridge (ACHB) inverter is presented in this work. The presented ACHB inverter is using a single DC source. The main bridge is directly connected to the DC source (such as, battery, fuel cell or photovoltaic array). And the auxiliary bridges are fed by isolated series resonant converter (SRC). Voltage of the auxiliary bridge is balanced by controlling...
Hybrid and resonant switched-capacitor (SC) converters have the potential to achieve higher power densities than conventional dc-dc converters. This work presents an interleaved, 20 V to 120 V, resonant SC converter which could be used in applications that benefit from high power density and efficiency. The resonant topology of this SC converter enables a compact and efficient design that minimizes...
Contactless Capacitive Power Transfer (CPT) is one of the emerging fields in the area of wireless power transfer. The system is fairly analogues to the inductive power transfer system. The CPT systems was primarily used for low power and small distance applications due to the development of unsafe voltages across the capacitive interface. However, the use of new compensation networks have enabled...
In electromagnetic resonance based wireless inductive power transfer (WIPT) system, voltage gain is determined by the coil inductances and the coupling coefficient of the power transmitting coils and frequency of operation. In this paper, voltage gain of an electromagnetic resonance based series-parallel compensated WIPT system is analyzed. Different control schemes are discussed to achieve high efficiency...
Gallium Nitride (GaN) HFETS are an enabling technology for high-density converter design. This paper proposes a three-level dc-dc converter with dual outputs based on enhancement-mode GaN devices, intended for use as a battery charger in aircraft applications. The charger can output either 28 V or 270 V, selected with a jumper, which meets the two most common dc bus voltages in airplanes. It operates...
This paper presents a multi-port isolated DC-DC converter for DC applications. A three-port structure is presented, characterized with full bidirectional power flow and simple control. Galvanic isolation is achieved by means of a multi-winding medium frequency transformer which is a part of a resonant LLC converter. To provide controllable power exchange with external DC ports, two out of three ports...
Inductive power transfer (IPT) is used to transfer the power over relatively large air gap using the resonant phenomena. The use of IPT in the railway transportations enhances the system performance in terms of reducing the on board energy requirements, minimizing the visual pollution, and reducing the infrastructure. The main challenge in IPT is to transfer efficiently the power from the primary...
Anasymmetric PWM controlled LLCC LED driverwith capacitor connected in series with secondary windingof the transformer is proposed. Due to the presence of the secondary side resonant capacitor, the DC bias of the magnetizing current can be eliminated when asymmetric PWM control is employed. Because the switching frequency is fixed regardless of the load variation, the efficiency of light load is improved...
In this paper thorough analysis of Series-Parallel resonant inductive coupling (SPRIC) has been presented using two-port network theory. Characteristic of SPRIC has been derived and plotted against load variation and frequency variation in MATLAB. Concept of forced resonance and natural resonance has been discussed. Important expressions such as current transfer ratio, voltage transfer ratio, maximum...
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