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Torque ripple and acoustic noise are two major drawbacks to switched reluctance motors. The abrupt change of phase current is main cause of acoustic noise, while both commutation and current wave shape are two major factors contributing to high torque ripple. In order to simultaneously reduce torque ripple and noise, a specific current modulation based on real inductance profile can be employed to...
The analysis of an isolated single-stage three-phase ac-dc converter with high power factor, based on the modularity of dc-dc SEPIC converters operating in discontinuous conduction mode is presented in this paper. The ac input is star-connected while the output of the modules are series connected. Doing so, the converter can provide a high step-up ratio and, consequently, besides high output voltage,...
This paper proposes a wire-bonded design with a unique double-end sourced structure for multi-chip paralleled SiC power modules. The proposed design achieved a reduced power-loop inductance of 7.2 nH, while inheriting the advantages of the conventional wire-bond technology. More importantly, the symmetrical structure of the proposed design brought consistent performances to the paralleled devices...
This paper presents a detailed parametric sensitivity analysis for a wireless power transfer (WPT) system in an electric vehicle application. Specifically, several key parameters for sensitivity analysis of a series-parallel (SP) WPT system are derived first based on analytical modeling approach, which includes the equivalent input impedance, active / reactive power, and DC voltage gain. Based on...
In this paper, the zero sequence circulating current in open winding (OW) permanent magnet synchronous machine (OW-PMSM) drives with common DC bus is systematically analysed for the first time. It is revealed that the zero sequence circulating current is affected by zero sequence back electromotive force (EMF), cross coupling voltages in zero sequence, from the machine side, pulse width modulation...
Due to the realization of zero voltage switching (ZVS) under the full load range, LLC resonant converter is widely adopted in the telecom, battery charger and several applications, characterized with high efficiency, high frequency and high power density, to realize DC conversion. Recently, by using Gallium Nitride (GaN) HFETS, switching frequency of LLC converters is further increased. However, ZVS...
This paper presents comprehensive analysis of a single-stage, isolated, high-frequency ac link based dc-ac converter suitable for PV microinverter applications controlled using phase modulation of the cycloconverter devices (secondary side modulation). A flyback-based regenerative clamp circuit is used for mitigating voltage-spikes on the secondary devices arising due to leakage inductance induced...
Torque ripple minimization of concentrated wound segmented rotor SRM is achieved through rotor segment designs. Compared to existing ripple minimization techniques the proposed method does not require current profiling, controller complexity or additional converter components. First, an FEA based semi-numerical machine model is developed to identify the torque ripple sources. Next, a new design of...
This paper presents a structured design method for half-bridge converters with higher-order lossless output filters, focusing on the popular LCL filters. The method builds on the theory of terminated ladder networks and on a control algorithm actively emulating the ladder network's termination. Given a desired transfer function, a normalized ladder network is accordingly synthesized and scaled to...
As a mid-range wireless power transfer (WPT) technology, magnetically coupled resonant (MCR) WPT has become a reseach focus in recent years. In this paper, an equivalent circuit model of 4-coil MCR WPT system was presented, along with the formulas of the output power and transmission efficiency. Besides, to comfirm whether spatial misalignments will influence the transmission characteristics of the...
Coasting is a fuel-saving driving mode that is usually active when the vehicle slows down. In an electric vehicle (EV), coasting can be achieved by letting the q-axis current to be set to zero. However, braking action often occurs at high speeds when the gas pedal is tipped off. That is, negative torque is produced while the q-axis current is equal to zero. Such a braking torque reduces the coasting...
In the field of permanent magnet synchronous motor (PMSM) self-sensing control, the initial rotor position estimation is always important, for which, the rotor magnetic polarity estimation is particularly a major task. This paper presents a robust rotor polarity estimation method based on the comprehensive utility of both magnetic saturation effect and rotor angular acceleration. The method can be...
This paper proposes a novel approach for calculating position-dependent inductance matrix of slotted permanent magnet synchronous motors (PMSMs) and advanced analytical models for machine voltage and torque. In a real PM machine, the slotted structure of the stator and rotor causes unintended variations in air-gap permeance and magneto-motive force (MMF). The proposed approach analyzes the effects...
A credit-card sized three-port dc-dc converter (TPC) has been designed and constructed. The TPC has three DC ports in one circuit, and DC power can be transferred without interference mutually. A dual active bridge converter (DAB) and a non-isolated bi-directional dc-dc converter (NBC) are integrated in the TPC by using a technique known as magnetic coupling inductor. Both thermal and soft-switching...
A 1200 V SiC MOSFET switches at much faster rate compared to a Si IGBT. As a consequence, SiC MOSFET experiences comparatively more ringing in device voltage and current due to the presence of parasitic inductance in the converter layout. Therefore, it is not straightforward to retrofit SiC MOSFETs in the converter layout of IGBTs where parasitic inductance appears in the range of 100 nH to 300 nH...
In this paper, an comprehensive impedance analysis is proposed to detect inter turn short circuit fault in PMSMs at start-up. This method requires a very small computational load (less than 5% CPU bandwidth) and is easy to implement. The procedure is performed at start-up during standstill mode, and hence agnostic to well-known issues caused by transients, load/speed level or controller coefficient...
SiC T-type LCL inverter can achieve smaller device loss than two-level topology, however its improvement on power density is limited by current ripple loss on magnetic components as switching frequency increases. This paper presents a paralleled-five-level (P5L) PV inverter which achieves better utilization of SiC devices than traditional T-type three-level (3L) LCL topology at higher switching frequency...
In this paper, based on a double-sided LCC compensation network, the leakage inductance equivalent model of the loosely coupled transformer (LCT) is built and the constant current (CC) output with load independent is analyzed in an inductive power transfer (IPT) system. This paper proposes four resonance conditions for achieving constant voltage (CV) output in various load conditions for the compensation...
This paper presents a design process of inducing self-inductances for the lowest power losses of magnetic pads in inductive power transfer (IPT) system. The total losses of the magnetic pads caused by winding coil, ferrite core, and aluminum shield are numerically calculated and achieved by finite element analysis (FEA) simulation. By plotting the total power losses depending on the coil turns of...
Plasma generation systems represent a particularly challenging load for radio-frequency power amplifiers owing to the combination of high operating frequency (e.g., 13.56 MHz) and highly variable load parameters. We introduce a dynamic matching system for Inductively Coupled Plasma (ICP) generation that losslessly maintains near-constant driving point impedance (minimal reflected power) across the...
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