Conventional matrix converters (MCs) have limited voltage gain that is less than 0.866, whether for direct MC (DMC) or indirect (IMC). Existing Z-source (ZS)/discontinuous quasi-Z-source (qZS) DMCs and ZS IMCs achieved larger 0.866 gain; however, the former inherited complex commutation from DMC, latter involved a network in dc link led to non-all-silicon solution. In this paper, discontinuous qZS networks of existing ZS/qZS are used an IMC topology simplifying having high gain, but they...

It is comparatively easy to make computers exhibit adult-level performance on intelligence tests or playing checkers, and difficult give them the skills of a one-year-old when it comes perception dexterity. More than 15 years after was first stated, Moravec's paradox still holds true today. Fueled by vigorous research in machine learning, gap has consistently narrowed side. However, most fine manual motor displayed toddler are, date, far beyond what robots can do. that many valuable tasks...

This paper presents a switching bi-directional buck-boost converter (SBBBC) for vehicles-to-grid (V2G) system. The topology can provide an energy flow path exchange between the Li-battery/supercapacitor (SC) hybrid storage system (HESS) of electric vehicle and grid. not only has capability, but also function management. In this paper, state-space averaging method is used to analyze stability in boost buck modes. control strategy given according state charge (SOC) ensure that output voltage...

Through coupling the impedance network between grid and conventional indirect matrix converter (IMC), LC-filter-integrated quasi-Z-source (qZS) IMC overcomes 0.866 voltage gain limitation of also avoids input filter that is required to mitigate current harmonics qZS converters. This paper further investigates boosting LC filtering function IMC. The gain, function, parameters design are presented using a small-signal model circuit analysis. Simulation experimental results validate built...

Considering the helicity of Archimedean spiral coils, this paper proposes accurate expressions mutual inductance and their numerical calculation methods, which can be applied in wireless power transmission field, etc. Accurate are deduced respectively for two coils that coaxial, laterally misaligned, or non-parallel, calculations performed using Gaussian integration as well. In case coaxial results verified by 3D finite element method (3D FEM) compared with gained traditional approximates to...

Tunnel-structured Na_0.54Mn_0.50Ti_0.51O₂nanorods have been synthesized by a facile molten salt method.

Summary A new type of three‐phase quasi‐Z‐source indirect matrix converter (QZS‐IMC) is proposed in this paper. It uses a unique impedance network for achieving voltage‐boost capability and making the input current continuous conduction mode (CCM) to eliminate filter. The complete modulation strategy operate QZS‐IMC. Meanwhile, closed‐loop DC‐link peak voltage control proposed, estimated by measuring both capacitor voltages. With technique, high‐performance output can be achieved with an...

In this paper, by investigating an SIR epidemic model with nonlinear incidence, we present a new technique for proving the global stability of endemic equilibrium, which consists introducing variable transformation and constructing more general Lyapunov function. For obtain following results. The disease-free equilibrium is globally stable in feasible region as basic reproduction number less than or equal to unity, greater unity. generality illustrated considering certain incidences SIS SIRS models.

Purpose – The paper aims to propose a new type of three-phase quasi-Z-source indirect matrix converter (QZSIMC) extend the voltage gain for application in induction motor drives. Design/methodology/approach A unique H-shape network is connected between source and traditional achieve boost buck single-stage power conversion. complete space vector modulation (SVM) method proposed control QZSIMC. output amplitude can be boosted by shoot-through front-end rectifier, so whole system's extended....

Abstract A novel control scheme is presented to eliminate the negative effects of communication disturbances, which introduces active disturbance rejection (ADRC) in strategy design achieve objectives restoration bus voltage and sharing power even presence disturbances delays communication. Simultaneously, its dynamic decoupling feature used realise between voltage, so that proposed controller only exchanges information with neighbours, reducing burden simplifying structure. The performance...

Summary Quasi‐Z source indirect matrix converter (IMC) combines both advantages of conventional IMC and quasi‐Z inverter, for example, no direct current (DC) link capacitor, compact all‐silicon power converter, bidirectional flow, input factor controllable, high voltage gain; moreover, it does not require additional filter, because continuous network integrates LC filter function. However, there is literature to disclose common mode (CMV) issue IMC. In this paper, the first time, CMV...

This study proposes a traveling wave ultrasonic motor with metal/polymer-matrix material compound stator. The stator is composed of metal ring and polymer-matrix teeth. resonance frequency the different structural dimensions was analyzed by finite element method. From results, structure parameters were obtained. effects density elastic modulus tooth on also investigated. A viscoelastic contact model built to explore state between rotor. Considering density, tribological properties, prepared...

Due to the popularity of plug-in electric vehicles (PEV)and development converter technology, electric-drive-reconstructed onboard converter(EDROC)is widely used in charging system which can work vehicle grid(V2G) mode or grid vehicle(G2V) mode. In this article, an EDROC for V2G/G2V energy management is proposed. The uses permanent magnet synchronous motor as a inductor without additional equipment. Meanwhile, article proposes hierarchical and corresponding control strategy with proposed...

This paper proposes a three-phase quasi-Z-source matrix converter based induction motor adjustable-speed drives. The unique impedance network is utilized to overcome the limitation of voltage gain traditional converter. can provide buck-boost function by controlling shoot-through duty ratio and modulation index. Analysis base on state-space equation shows relationship among boost factor as well gain. Also, proposed speed control method able change from zero rated with full load torque....

Summary This paper presents a new topology of the input current continuous switch boost inverter (ICCSBI) and perturbation observation with hysteresis comparator method. Because traditional needs to join dead time avoid short circuit, will cause distortion output current. And is not suitable for photovoltaic power generation because it buck converter. The ICCSBI structure improves booster which refers Z‐source inverter. It can get higher voltage than Meanwhile, only retains advantages but...

The phase-shift modulation (PSM) brings wider voltage-gain range compared with pulse-frequency (PFM) control to the LLC resonant converter in particular occasions such as battery charging converters. Current researches have less discussion about current transfer gain especially at low range. switching frequency is much increased and high circulating occurs under voltage range, which large error fundamental harmonic approximation analysis. This work has proposed a numerical derivation method...

The short circuit problem is a difficult issue in LLC converter. This paper derives the state-plane trajectory of full-bridge converter based on analysis and characteristics performance are provided under mode. Two types control scheme for power switches, respectively phase-shift frequency-boost frequency-drop method, deduced By designing state variables, two schemes would achieve controllable current output while maintain advantage ZVS. Comparing with traditional solution increasing...