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A kind of LLC resonant converter with voltage-doubling rectifier technology is studied in this paper. The converter has not only a general LLC half-bridge resonant converter being easy to obtain ZVS for primary side switches and ZCS for secondary side diodes, a high efficiency of this topology, but also advantages that the transformer structure is simple in which one winding is involved on its secondary...
This paper presents the analysis and design of a boost converter with bipolar Dickson voltage multiplier. The bipolar Dickson voltage multiplier offers high gain with low stress on both capacitors and switches. Connecting bipolar Dickson cell to a boost converter yields several benefits such as an overall high static voltage gain and at the same time reduces the required inductance that ensures operation...
In the case of the presence of ferroresonance in distribution transformer due to a faulty switching operation, ferroresonance signals should be discriminated among its initiations due to opened single-phase, opened two-phases, and opened three-phases, so that ferroresonance mitigation can be conducted appropriately. However, the performance of mitigation system itself is highly determined by its accuracy...
The focus of this paper is on power flow control in the asymmetric quad-active-bridge (QAB) converter and its limitations imposed by uneven values of parasitic elements in the isolation transformer. The QAB converter under study is intended for solid-state transformer applications in asymmetric configuration, where one of the ports is placed at the low voltage side and rated for the threefold power...
A control strategy for a conventional Lundell alternator and an active-rectifier using different modulation schemes was proposed in previous work. The modulation techniques examined indicated that the system could operate more efficiently than a passive rectifier over a certain speed and power range. This paper extends the modulation scheme analysis using a SVM scheme with six commutations per switching...
The advancements in wide-band-gap (WBG) devices are enabling applications of power electronics converters coupled directly to medium voltage and incorporating galvanic insulation within the converter using high-frequency solid-state transformers. This paper presents the design and the characterization results of a SiC H-bridge converter suitable for up to 100 kVA single-phase ac-dc modular solid-state...
GaN-FETs are attractive switching devices for their fast switching capability. However, they often suffer from the oscillatory false triggering, i.e. a series of self-sustaining repetitive false triggering induced after a fast switching. The purpose of this paper is to derive a design instruction to prevent this phenomenon. According to the previous study, the oscillatory false triggering was found...
The efficiency of wireless power transfer (WPT) system is strongly influenced by the lateral misalignment between the transmitting coil and the receiving coil. To solve this problem, this paper proposed a multi-coil switching coupler to increase the coil lateral misalignment tolerance, in which the transmitter consists of thirteen hexagon coils, including three power supply areas and each area consists...
This paper presents a multilevel modular step-down DC-DC switched-capacitor converter that utilizes soft switching resonant operation. Previous versions of traditional multilevel modular switched-capacitor dc-dc converters (MMSCC) have a low switching device voltage rating. Moreover, capacitor voltage stress increases proportionally as the voltage conversion ratio increments. Significant advantage...
Based on the dynamic behavior of IGBT and diode, this paper proposed an experimental method for extracting stray inductance of bus bars without high bandwidth current measurement. The experiment is implemented by a double pulse test of the 4.5kV/3000A HVIGBTs. The stray inductance extraction results of several methods were analyzed and compared, verifying the accuracy of the proposed method.
SiC-MOSFETs have attracting increasing attention because of their outstanding characteristics that contributes to high efficiency and high power density of power converters. However, compared to conventional Si-IGBTs, SiC-MOSFETs are susceptible to false triggering, because they tend to generate large switching noise due to ultrafast switching capability and have a lower threshold voltage in high...
1700V SiC modules were built with next-generation SiC MOSFETs, with 25°C RDSON per MOSFET cut approximately 50% from existing commercial SiC MOSFETs. Additionally, the external SiC anti-parallel diode was eliminated in favor of using the SiC MOSFET body diode during the dead time. The resulting 1700V SiC module used only 32% of the SiC chip area, yet reduced the 25°C module RDSON from 8mΩ to 5mΩ,...
One of the primary requirements of dual active bridge (DAB) dc-dc converters is to operate under zero voltage switching (ZVS), to reduce switching losses and increase operating efficiency. However, three-phase DAB converters are known to have limited capability to operate in ZVS, particularly at low power levels, because of their inherent two-level six-step phase shifted square wave modulation strategy...
This paper proposes a transformer based self-starting boost converter for thermoelectric energy harvesting, which operates even when polarity inversion of thermoelectric generator (TEG) occurs. TEG is used to convert thermal energy into electrical energy. Due to the Seebeck effect, an open circuit voltage of the TEG is proportional to the number of thermocouples in series and to the temperature difference...
This paper presents a single-stage soft-switching high-frequency link isolated converter for bidirectional motor drive applications. The ‘minimal’ topology is based on the recently proposed soft-switching solid-state transformer (S4T) with a single current-source power conversion stage. This single stage approach reduces total switch rating, provides sinusoidal input and output voltages, and uses...
High power multi-level converters are deemed as the mainstay power conversion technology for renewable energy systems including the PV farm, energy storage system and electrical vehicle charge station. This paper is focused on the modeling and design of coupled and integrated magnetics in three-level DC/DC converter with multi-phase interleaved structure. The interleaved phase legs offer the benefit...
This paper investigates a multilevel inverter composed of series/parallel-connected H-bridges. The presented structure can be used for applications in which is intended to use semiconductor switches with low voltage and low current rating. A comprehensive system model to control the circulating current, an overall control strategy to adjust the output voltage with constant magnitude and frequency,...
The permanent-magnet (PM) motors are widely used in many industrial drives. Accurate knowledge of machine parameters, such as inductance is essential for efficient and optimal control of the machine. There are numerous methods proposed in the literature for online as well as off line learning of machine parameters. They differ in accuracy and measurement techniques. This paper proposes an online measurement...
Among various converters, the LLC electric current resonant converter attracts attention because of high power density, low noise and high efficiency. However, this converter cannot apply the analysis of averaging method, and impossible to derivate the transfer function, so designing is difficult. In this study, we devised a method to derive a frequency response characteristic with a transfer function...
This paper proposes a novel Dual Active Bridge (DAB) converter, which has an auxiliary inductor and a bi-directional switch connected in parallel to a transformer in order to achieve zero voltage switching (ZVS) over a wide load range and a wide battery voltage variation. In the proposed converter, the equivalent magnetizing inductance is changed by switching the auxiliary inductance depending on...
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