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In the design of compact, power dense electrical machines found in automotive and aerospace applications it may be preferable to accept a degree of eddy current loss within the winding to realise a low cost high integrity winding. Commonly adopted techniques for analysing AC effects in electrical machine windings tend only to be applicable where the conductor dimensions are smaller than the skin depth...
This paper demonstrates the impact of modulation schemes on the power capability of a high-power converter with low pulse ratios. This IGCT converter uses a five-level Neutral-Point-Clamped H-bridge topology. It is concluded that phase-shifted carrier modulators are not attractive for such converters at low pulse ratios due to the poor THD (Total Harmonic Distortion) performance and poor power capability...
Modular multilevel converters have several attractive features such as high voltage capability and scalability, the excellent quality of the output voltage waveforms, a modular structure and the utilisation of standard components. Despite of all these benefits, the main drawback of this converter is the control system complexity due to the multiple external and internal control objectives. One of...
This paper presents an alternative solid-state topology for fault current limiting and interrupting device (FCLID) that is suitable for low-voltage distribution networks. The switching frequency of the proposed topology in the fault mode has been significantly decreased. Single phase prototype of the original and proposed FCLID are developed and experiments are carried out. The results show that the...
Currently, there is immense incentives-driven research, in the automotive industry to develop Plug-In Electric Vehicles (PIEVs) to reduce the green-house gas emissions and to comply with the Kyoto accord. Isolated High frequency AC-DC converters are a major component to transfer power from utility mains to the traction battery packs which store energy for the EV motors propulsion. The front-end AC/DC...
A general-purpose control algorithm is proposed for permanent magnet (PM) synchronous machine drives based on the principles of Direct Flux Vector Control. The algorithm does not require regulators tuning, and it is tailored to different machines automatically via identification of the stator resistance and flux linkage tables. The model parameters are identified via a preliminary self-commissioning...
In this paper, a new approach is presented for integrating the function of onboard battery charging into the traction drive system and accessory dc-dc converter of a plugin electric vehicle (PEV). The idea is to utilize the segmented traction drive system of a PEV as the frond converter of the charging circuit and the transformer and high voltage converter of the 14 V accessory dc-dc converter to...
Power factor correction (PFC) converter consumes a large part of volume of power supply. Typical switching frequency of commercial PFC converter is usually not higher than several hundred kHz. Increasing the switching frequency of PFC converter to MHz by using GaN devices can greatly reduce the size and increase power density of power supply. In order to eliminate the high turn-on loss of cascode...
This paper presents a board-level integrated silicon carbide (SiC) MOSFET power module for high temperature and high power density applications. Specifically, a silicon-on-insulator (SOI) based gate driver capable of operating at 200 °C ambient temperature is designed and fabricated. The sourcing and sinking current capability of the gate driver are tested under various ambient temperatures. Also,...
One solution for increasing output power in general purpose inverters is raising the operation temperature of Insulated Gate Bipolar Transistor (IGBT) modules by junction max temperature (Tjmax) =175°C against conventional Tjmax=150°C. However, the main problem for Tjmax=175°C operation is decreased the power cycling (P/C) capability caused by higher temperature. In this paper, we investigated the...
The information of the remaining useful lifetime (RUL) of insulated-gate bipolar transistors (IGBTs) is useful for effective maintenance of a power converter before the failure of a device. Thermo-mechanical stresses are the major cause to the aging of the weak points of the packaging that determines the lifetime of an IGBT module. Traditionally, the RUL of an IGBT module is simply predicted based...
Design of a Switched Reluctance Machine (SRM) for off-road hybrid electric vehicle applications is presented in this paper. SRMs are ideally suited for this application for their low cost, fault tolerance and reliable operations. A methodology to get an optimized design for meeting the torque-speed requirements is developed. The process aims in determining the best speed at which the SRM would start...
A novel TRIAC dimming LED driver that can control the brightness of LED arrays for a wide range of source voltage variation is proposed. Contrary to conventional PWM LED drivers, proposed LED driver uses TRIAC as a main switch, which inherently guarantees zero current switching and proven to be quite reliable. These characteristics can significantly improve switching loss and provide a long lifetime,...
Because of sequential cycling of series/parallel-cell configured battery pack, cell's degradation in the battery pack is absolutely inevitable. Then, in order to prevent an additional degradation of the pack, an accurate knowledge of state-of-charge (SOC) estimator for deteriorated pack is essential. Thus, in this approach, a data-driven SOC estimation method based on the merged sliding-mode observer...
The characteristics of commercially available silicon carbide power devices and packaging technologies have been measured up to 350°C in order to obtain their reliability and suitability for use in a hybrid electric vehicle application. Electro-thermal simulations of representative power module packaging structures, using measured conduction losses, revealed the respective temperature profiles of...
In an open-winding machine, the three-phase stator currents can be controlled to contain the same harmonic current components like the third harmonics. This paper introduces a new harmonic current excitation principle in synchronous machines based on open winding controls. Unlike existing harmonic excitation technologies which utilizing the third harmonic components of rotor magnetic fields, this...
The recently proposed Hexverter topology belongs to the group of modular multilevel direct AC/AC converters. For its operation, a so-called adjacent compensating power is essential. This paper introduces a new method for composing the adjacent compensating power, which optimises the efficiency. The importance of the adjacent compensating power for branch energy control is shown and the differences...
This paper introduces a high step-up ratio isolated dc-dc circuit which can be used as an interface between 20 V-40 V PV panels and high voltage dc system, up to 1000 V. By combining the switched inductor (SL) and quasi switched capacitor (QSC) structures with the traditional isolated full bridge circuit, the 50 times boost ratio is realized with small turns ratio. In this case, the leakage inductance...
This paper has introduced a new uni-directional five-level rectifier, which has less number of devices than the conventional five-level rectifiers. The power output capability of this rectifier is limited and is a function of dc-link voltage and inductance, which is derived in the paper. This paper has also proposed a control method to regulate the dc-link neutral point voltage and flying capacitor...
A novel ZVS range control technique using an auxiliary series transformer for a Dual Active Bridge (DAB) DC-DC converter is proposed. The auxiliary transformer fed with an additional H-bridge at the secondary, adds a phase-controlled voltage in series with the main converter voltage either at the primary or secondary. This addition helps to control the reactive power flowing through the main converters...
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