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In this paper a 5kW step-down converter for low-voltage high-current application is presented using normally-off SiC JFETs as high voltage power switches, operating with efficiency close to 98%. Different low voltage side rectification solutions and loss estimations are also presented. As results show higher power density and efficiency can be achieved in medium- or high-power DC-DC applications by...
The paper presents the energy saving potential of induction machines by using variable rotor flux instead of commonly used constant flux. The efficiency optimized rotor flux depends on the actual load and speed of the motor. At low load it has to be decreased with reference to a pre-calculated lookup table. This table can be included in a field oriented speed control structure as reference value of...
Providing racing sailboats with renewable energy sources deals with boat performances, reliability and skipper's security. In this study, an innovative solution is presented to feed a sailboat with green energy by using a hydro-generator. This paper also interests on energetic efficiency and presents the close relationship with control strategy. A new control strategy for HG is proposed and experimentally...
Due to the challenge for sensorless control of concentrated windings (CW) interior permanent magnet synchronous machines (IPMSMs), this paper presents the analysis of a novel stator IPMSM for sen-sorless control based on high-frequency rotating voltage signal injection method. The topology of the machine is introduced and the new IPMSM has the advantage of less space harmonics. The sensorless control...
In this paper, an online filtering technique advantage is presented to improve the decoupling method already used on energy management for electric vehicles and hybrid electric vehicles. The most widely used power sources in electric vehicles and hybrid electric vehicles are batteries, super-capacitors and fuel cells. Several studies have been made on these type of power sources and concludes that...
In this paper, an ohmic heater circuit is proposed using low cost, low volume, high power factor, high efficiency, and high frequency power inverters. In order to reduce switching losses while keeping operation frequency high, the well-known techniques of zero-voltage switching (ZVS) and phase shifting control are described and used. A low frequency control loop is proposed as a way of getting low...
This paper points out the generic matrix approach to design Pulse Width Modulation strategies of three-phase Voltage Source Inverters. This well-known problem has infinitely many solutions, and many modulation methods already exist. This mathematical approach deserves to be explored by its rigor and must identify known but also new solutions.
The article introduces an off-line power supply, using the ALTAIR05T-800, an innovative all-primary controller, by STMicroelectronics. Using the proprietary patented all-primary sensing feedback technique, the IC is capable of providing accurate output voltage regulation and tight output current regulation, thus eliminating the need for any secondary side component. The proposed power supply is able...
This paper presents an optimal current control for the hybrid excitation synchronous motor in electric vehicle application. The whole electric propulsion system is modeled including the battery and converters. The control aims to meet the torque and speed requirements while insuring minimal copper and iron losses as well as inverter and chopper losses. Extended Lagrange multipliers optimization method...
In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by...
This paper deals with the control of a haptic device which is used in a generator mode to produce electricity from a user's walking movements in a handheld device, like a mobile phone for instance. We first present the design principle of such a device. Then, a design is presented, which allows haptic feedback and energy harvesting to be produced with a same device. It is based on a piezoelectric...
The paper deals with the fundamental research for the design of an electric drive system for a sailplane in cooperation with the oldest and one of the largest sailplane manufactures Alexander Schleicher1. The realizability of this purpose is checked by a system perspective of the electric drive system. Different approaches are considered, e.g. a system with a gear, a downsized motor or an air drag...
The recent developments in electric vehicles philosophy and technology requires that they be able of charging anywhere, but also be capable of delivering their storage energy back to the grid. Therefore, autonomous energy management decision support technologies such as Energy Box, have earned prominence along with the latest electric vehicles chargers developments. These technologies increase the...
Smart grids feature distributed energy resources interfaced to the grid by means of switching power converters. Synergistic control of these units can considerably increase the distribution efficiency and power quality by limiting the unbalance, reactive, and harmonic currents flowing through distribution lines. This can be achieved by a distributed control and communication architecture which implements...
The low cruising range of full electric vehicles retards the triumph of electric mobility. An optimal braking energy recovery can help to enlarge the range. For this paper, the recuperation energy of a currently available electric car is measured during brake applications with different deceleration values and for several states of charge of the traction battery. The test results are analysed to give...
The paper deals with the influence on the power quality of various new technologies of household appliances and measurement of their energy efficiency. Using a virtual power quality analyzer, which enables measurement of all power components according the newest power models and definitions, series of measurements were performed. Details of the measurement of harmonics generation by different domestic...
Railway traffic increases and electricity market liberalization constrain the railway actors to consider new solutions to handle the energy consumption. Hence, a technology change in the railway electrical systems is considered through the integration of renewable energy sources and storage units. In this context, a relevant methodology is proposed here for optimal design and operation analysis of...
Multiphase induction heating is a powerful solution for industrial metal heating. An innovative and optimized combination of the supply currents which is presented in this paper, looks for improving the temperature profile. The resonant inverter and inductor losses of this given structure are calculated for each optimized solution and lead to a maximization of the efficiency.
In this paper we present a guide to choose an energy efficient configuration of a pump drive system in an early stage of design process based on an user-defined load profile. All subsystem models are briefly presented, including different control methods (speed and throttle control) and single or cascaded pump drives. These models are based on free accessible parameters of data sheets. The analysis...
This paper presents a high voltage DC-DC converter topology for bi-directional energy transfer between a low voltage DC source and a high voltage capacitive load. The topology is a bi-directional flyback converter with variable switching frequency control during the charge mode, and constant switching frequency control during the discharge mode. The converter is capable of charging the capacitive...
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