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Due to the interaction between human and the power supply equipment, more and more Switch-mode power supplies (SMPS) require lower leakage current. In the AC-DC SMPS, the leakage current is mainly caused by the Y-capacitors. It is better to remove the Y-caps in this situation. But connecting Y-caps between the primary return line terminal and the secondary return line terminal is a very common method...
Open-end winding topology with a common DC source has path for zero-sequence current. Zero-sequence current needs to be suppressed because it does not contribute to the drive torque but has harmful effects such as loss and torque ripple. Both inverter and motor have sources of the zero-sequence component. The zero-sequence source on the inverter side is the voltage error due to dead time in switching...
In this paper, an integrated, reconfigurable DC-DC converter for plugin and hybrid Electric Vehicles (EV) is proposed. The converter integrates functionality for both EV powertrain and charging operation into a single unit. During charging, the proposed converter functions as a DAB converter, providing galvanic isolation. For powertrain operation, the converter functions as an interleaved boost converter...
Many high power converter systems are often connected to the medium voltage network using a step-up transformer. In such systems, the converter-side windings of the transformer can be configured as an open-end and multi-level voltage waveforms can be achieved by feeding these open-end windings from both ends using the dual-converter. An LCL filter with separate converter-side inductors for each of...
This paper presents the development and experimental performance of a 2-kW interleaved DC-capacitorless single-phase inverter. By utilizing an AC capacitor to absorb the ripple power pulsating at twice the line frequency, the proposed interleaved DC-capacitor-less single-phase inverter significantly reduced the total capacitor size. The adoption of SiC MOSFET with 216-kHz switching frequency and the...
In this paper, a new multi-purpose switched reluctance machine drive with charging capabilities is introduced. This topology satisfies propulsion requirements and allows single phase as well as three-phase AC charging. In charging mode, the machine windings are used as inductors and the zero torque condition is maintained by canceling out all tangential forces. Every component of the SRM drive is...
This paper presents a new three phase single tooth concentrated winding topology. With the new locally asymmetric configuration, each individual harmonic can be addressed, so operations with any number of pairs of poles are possible. Furthermore, the new arrangement of single coils presented here allows variations of winding characteristics such as winding factor, spectrum of the magnetomotive force...
Two low-power High-Speed Permanent Magnet Synchronous Machines (HS PMSM) are reviewed. The powers and speeds of the machines are 3.5 kW at 45 000 rpm and 11 kW at 31 200 rpm. Both machines under consideration have 6 slots and 2 poles and they are both using Tooth-Coil (TC) windings also known as non-overlapping concentrated windings. The rotors of the discussed machines consist of the diametrically...
This paper proposes ten alternative drive topologies with reduced number of controlled switches. The topologies are composed by three-level (3L) and two-level (2L) legs combinations. All of them aim to feed a three-phase machine based on the concept of open-end-winding (OEW). Conventional OEW configurations are considered for comparison purposes. The proposed topologies are named accordingly to the...
High step-up DC-DC converters are widely used in many industrial appliances and recently introduced in renewable energy systems and automotive applications due to their high voltage gain capability. Nevertheless, current high step-up converters often employ additional circuitry with the purpose of increasing the voltage gain. Consequently, the converter will be bulky, heavy and expensive, because...
This paper deals with the identification and analysis of an electric drive configuration at system level. In terms of efficiency and power density, the investigation is intended to enable a statement whether the ideal electric motor application is a direct drive or a combination with a gearbox in the drive gondola of a Do 128-6 aircraft. In this research, seven versions of electrical drive combinations...
The following work introduces the use of nine-switch converter in a multi-channel dual configuration for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when...
This paper further demonstrates the versatility of the Tapped Inductor Switcher (TIS) analysis method proposed in a previous paper. The aim is to extend the application of this modeling technique to converters containing multiple inductive elements. As a study case, a tapped inductor SEPIC derived dc/dc converter is considered. The study from this paper suggests that the SEPIC can be modeled by two...
This paper proposes two seven level asymmetric inverter with coupled inductors that enable a reduction in the number of controlled switching devices. However, the lack of redundant states and difference in the maximum pole voltages reduce the performance of the inverters due to higher winding currents and saturation of magnetic core. For mitigating those issues, a coupled inductor with elevated magnetizing...
In this paper, a modular inverter topology conceived by input series connection of H-bridge (ISHB) is presented and verified trough experimental results. The proposed converter is naturally appropriate for open-end split winding induction motor drive due to the galvanic isolation offered by the machine. Each sub-module is composed by a H-bridge inverter, which is characterized for a modulation with...
A low power and high step-down ratio insulated DC-DC converter applied to energy conversion of medium to low voltage is proposed, analyzed and evaluated in this paper. Among its many applications, this work focuses in a compact, simple and low cost galvanic insulation auxiliary power supply. The proposed converter is a multilevel Flyback derived from the Double-Ended topology and it uses the NPC (neutral...
The following work introduces the use of a dual three-phase converter with reduced number of switches in a back-to-back configuration for its application to an open-end-winding permanent magnet synchronous generator based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual three-phase voltage source converter capable of controlling two sets of three-phase variables...
This paper presents the modeling and control of a high voltage gain dc-dc converter based on the three-state switching cell (3SSC). Initially, the equivalent circuit must be obtained so that a mathematical modeling tool can be applied, which in this case is the PWM (Pulse Width Modulation) switch. From the small-signal analysis of the converter, it is possible to obtain the most relevant transfer...
In order to define which power converter topology is the most adequate one for a given application, several aspects must be analyzed, such as cost, efficiency, size, and volume of the chosen structure. This paper extends the concept of the commutated power to classical dc-dc high-frequency isolated converters e.g. the one-switch and two-switch forward converters. It allows determining which topology...
Multipulse rectifiers are one of the solutions for current harmonics mitigation. In this paper, a novel 20-pulse full-wave AC-DC converter based in two three-to-five phases delta/zigzag transformers connected in series is proposed. A theoretical investigation of the proposed rectifier operation is presented. Afterwards this structure is simulated to obtain more real operation results. A prototype...
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