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With their intrinsic superiorities such as high breakdown electric field and high thermal conductivity, SiC MOSFETs are replacing Si IGBTs in power electronics applications. However, at higher voltages SiC MOSFETs are at early stage of development and are not commercialized yet. For the first time, this paper presents thorough static and dynamic performance characterization of 3.3 kV and 30 A discrete...
Lithium-ion batteries are characterized by having very good performance in terms of efficiency, lifetime, and self-discharge, which allowed them to become the major player in the electric vehicle applications. However, they were not able to totally overcome the EV range anxiety. Thus, research is carried out nowadays to develop batteries with even higher gravimetric energy density, which should allow...
Tracing current vs. voltage curve is an important part of the documentation of a Photovoltaic (PV) system to comply to the IEC 62446 standard. In order to get the high accuracy, the PV array would be subjected to an unspecified and large number of voltage perturbations often using specialized measuring instruments. In this paper, we explain how to minimize the tracing-time by performing a pre-defined...
This work proposes an Active Thermal Control (ATC) of power switches. Leveraging on the fact that thermal stress has wide impact on the system reliability, controlling thermal transients is supposed to lengthen the lifetime of electronic conversion systems. Indeed in some environments, such as transportation, reliability and lifetime are still obstacles to widespread adoption of electric and electronic...
In permanent magnet servo motors, each component has a certain temperature limit. For on-machine device with electronic components, like the high resolution optical encoder, the temperature limit is commonly less than 125°C. While for the motor body, the winding and the magnets usually have higher temperature limit. During continuous operation, the encoder temperature, rather than the winding or magnet...
Although the generation of 3D temperature maps has become a frequently used technique, not only in search and rescue applications but also during inspection tasks, the remote measurement of a surface's true temperature is still a huge challenge. In this work, we face the problem of creating corrected 3D temperature maps in unknown environments without prior knowledge of surface emissivities. Using...
In this paper are described some principles and new methods underlying the temperature adjustment in an laboratory electrical furnace. Due to high thermal inertia, classical Proportional-Integral-Derivative algorithms are difficult to be implemented when a high precision temperature adjustment is required. An original software algorithm written in C language performs the temperature control function,...
Permanent magnet synchronous machines (PMSMs) operation above based speed is typically achieved by injecting negative d-axis current to produce flux weakening. However, this increases permanent magnet (PM) losses, reducing therefore the machine efficiency. Previous studies have reported that PM loss increase in flux weakening operation is due to the increase of the airgap flux harmonic content. These...
A highly accelerated power cycling test platform using current source converter for SiC-MOSFET power modules is proposed. The control principles of delta and average junction temperatures are introduced. By using isolated thermal fibers, the junction temperature (Tj) variations can be monitored during the test process without removal of silicone gel. The power module is tested in the conditions of...
This paper proposes a novel technique that can significantly reduce the time required for induction machines full-load performance test by using the direct dynamometer tests of IEEE Std 112-B. The proposed technique needs only 30-min of a machine run under the full-load condition. The temperature-speed linear relationship is utilized in this research work to reduce the testing time. The accuracy of...
The reverse recovery characteristics of the body diodes of planar and double-trench SiC MOSFETs are experimentally analyzed in switching tests and compared. The body diode of the trench SiC MOSFET shows improved performance, so that using an anti-parallel SBD to suppress the reverse recovery behavior becomes unnecessary. Following the switching tests, the devices are operated in continuous mode in...
Interior permanent magnet synchronous machine drives are widely employed in electric traction systems and various industrial processes. However, prolonged exposure to high temperatures while operating can demagnetize the permanent magnets to the point of irreversible demagnetization. In addition, direct measurements with infrared sensors or contact-types sensors with wireless communication can be...
The performance of digital circuits can be improved by more efficient implementation. For certain circuits this can be done by using pass transistor logic. This paper compares pass transistor logic styles with the standard CMOS logic style. It will be shown that pass transistor logic is able to outperform the standard approach, not only by simulation but by measurements in silicon. Measurements have...
A single-point temperature control system is proposed and investigated in a continuous multi-section induction furnace to control the temperature of the metal load leaving the furnace. The furnace consists of at least three sections. The temperature is measured at a fixed point along the length of the second section on the surface of the workpiece and compared with the set temperature. The power of...
Research in the area of internet-of-things, cyberphysical-systems, and smart health often employ sensor systems at residences for continuous monitoring. Such research-oriented residential monitoring systems (RRMSs) usually face two major challenges, long-term reliable operation management and validation of system functionality with minimal human effort. Targeting these two challenges, this paper describes...
This paper treats several aspects of numerical simulations that involve heat transfer mechanisms at microscale. Two different simulation approaches are analyzed and their results are compared with experimental ones. The investigated case study is intended to be used as an example for approaching similar problems in the field of microscale systems, MEMS devices particularly.
Torque production capability of permanent magnet synchronous machines (PMSMs) depends on the permanent magnets (PM) magnetization state (MS). MS is a function of PM initial magnetization level, decreasing as temperature increases. Furthermore, excessive PM temperature can produce irreversible PM demagnetization. PM MS and temperature measurement/estimation is therefore important both for torque control...
In this paper a non-invasive thermometric system for the measurement of the temperature of fluids in pipes based on the dual heat flux method is presented. The proposed solution is a possible alternative to the employment of thermowells in industrial applications. The proposed sensing system, is based on the dual heat flux method, a technique used in biomedical field. The applicability of such a measurement...
Junction temperature is of great importance to safe operating area of IGBT modules. Various information of the IGBT operating state is reflected on electrical characteristics during turn-on transient. A unified extraction method for internal junction temperature via dynamic thermo-sensitive electrical parameters (DTSEP) during turn-on transient is proposed. Two DTSEP, turn-on delay time (tdon) and...
The paper deals with real-time estimation of the junction temperature of a SiC power MOSFET modules. The junction temperature of one device of the module is real-time estimated by measuring its current and on-state voltage at each time sample, and entering the temperature model of the device. The temperature model is obtained in a dedicated commissioning session, where the vON is measured at different...
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