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There are two common-mode voltages (CMVs) in a system composed of dual Y shift 30° six-phase electric machine and power converter, which bring detrimental effects on the system. To suppress the amplitude and changing frequency of CMV, a method with six-phase space vector pulse width modulation (SVPWM) is presented. The six intermediate vectors which become zero vectors in o1-o2 and z1-z2 planes are...
Inductive Power Transfer (IPT) systems have been more and more popular as they offer numerous advantages over conventional wired power transfer systems in terms of convenience, safety, isolation, and flexibility. This paper presents an overview of power converter topologies as well as modulation strategies for IPT systems. Besides, a brief introduction to the overview of fundamental components in...
The work presented in this paper focuses on the power flow control and study of three-limb high frequency transformer enabled three port Dual Active Bridge(DAB) converter, using 1200V and 1700V SiC devices. The advantage of using three-limb transformer is given by the low inter-winding parasitic capacitances due to placement of windings on different limbs and elimination of inter-winding insulations...
The paper considers the issues of enhancing immunity of the variable frequency electric drives (VFDs) с to short-term power supply interruptions. It proposes the concept of electric drives of the frequency converter-two-speed asynchronous motor system with switching structures. It is proved that development of VFDs with supply from two inputs is reasonable as they almost exclude simultaneous failures...
This paper presents a single stage, bi-directional multi-level converter topology with a multi-winding medium frequency transformer (MFT) isolation to interface a low voltage DC with a 3-phase high voltage grid. The proposed topology can be used for integrating 3-ph utility grid with various low voltage renewables like solar photovoltaic, fuel cells etc. The transformer secondary windings in each...
On load, transformer primary tap changing is not common in high frequency converters. This paper investigates a new converter topology to drive primary tapped transformers. The ideas that have been introduced previously are simply implemented into existing converter topologies which have been modified to accommodate a primary tapped transformer. The effects of efficiency with variation of source voltage...
In designing switch mode power supply (SMPS), the desirable feature is to have an efficient and compact design. The main idea is to increase the switching frequency and reduce the bulky magnetic parts of the converter. This leads to a compact size, less weight, reduced cost and increased power density of the converter. This paper presents a high frequency full bridge DC to DC converter, using a multilayer...
In order to solve the problems existed in the field of high power applications such as voltage stresses and harmonic interferences of the two-level AC / AC converter, a new kind of high frequency isolated half-bridge three-level AC / AC direct converter is proposed, which can convert one alternating voltage with instability distortion to another regulated constant frequency sinusoidal voltage. The...
This paper presents a modular AC-AC converter with high frequency AC link. It is constructed from connecting multiple current mode AC-AC converters with high frequency AC link in series at the input sides and parallel at the output sides (ISOP). This topology allows the use of low voltage power switch. Control strategy and operation principle of the converter are investigated. Four operation modes...
This paper briefly reviewed the technical characteristics about the Switched Reluctance Drive system(SRD) and the application history of related products. A comparison was made for the technical characteristics between SRD and AC variable frequency speed regulation system. In the end, some new products of SRD were introduced.
This paper presents a novel three-phase ac/ac power converter topology with a high frequency ac-link for adjustable speed PWM ac drives. Such drives find applications in electric power generation from renewable energy sources like wind. This converter has a single power conversion stage with bidirectional power flow capability. The high frequency transformer provides voltage transformation, isolation,...
The paper presents an innovative off-line low profile converter design that delivers 750 W of power at 95%-96% efficiency for nominal input range, using variable frequency topology with high frequency zero voltage switching (ZVS) and zero current switching (ZCS) for primary switchers. Theoretical considerations and practical results are presented for high frequency and high voltage soft-switching...
The diesel-electric drive system of an industrial truck is extended with an energy storage subsystem utilizing ultra-capacitors thus establishing a reliable technical solution with a great energy saving potential. A bidirectional three-phase DC-DC converter is proposed to charge the ultra-capacitors during the regenerative braking of the electric drive and to discharge them when peak power is demanded...
A circuit topology of the forward-mode three-level AC/AC converter is proposed. The kind of circuit topologies are constituted of multilevel converter, high frequency transformer, output cycloconverter, and output filters. The converter has the advantages such as concise circuit structure, two-stage power conversions, bidirectional power flow, high frequency electrical isolation, three-level voltage...
A high intercept points, cost-effective, and power-efficient switching FET double balanced mixer (DBM) is reported. The Switching FET DBM demonstrated in this work offers input intercept points (IIP3) and conversion loss typically 44 dBm and 8.5 dB respectively with 15 dBm LO power for the frequency band (RF: 900-2150 MHz, LO: 850-1950 MHz, IF: 50-200 MHz). The measured interport isolation is typically...
A new family of rectification topologies are proposed in this paper for future low-voltage high-current applications. The proposed rectification technique has N filter inductors to share the output load current. Compared with the conventional center-tapped and current doubler rectifiers, it has higher current capability and better thermal management can be achieved. Besides, the inductor magnetic...
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