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The on-state resistance Ron of GaN devices can be affected by charge trapping as well as temperature effects. For the reliable application of the devices it is useful to distinguish between these two effects and understand the cause of power losses. In this work, three state-of-the-art GaN power transistors are investigated. An obvious Ron increase by trapping occurs in the GaN normally-off devices,...
In this paper, an 1.2 kW thermoelectric generation system (TEG) for industrial waste heat energy recovery is developed and implemented. To achieve better performance, a novel hybrid maximum power point tracking (MPPT) method is also proposed. Comparing with conventional perturb and observe (P&O) technique and variable-step P&O method, the presented MPPT method can improve the tracking speed...
In this work, the static and dynamic characteristics of a new double-trench SiC MOSFET are experimentally investigated and compared to two different available commercial SiC MOSFETs. The SiC devices are applied in a ZVZCS Phase-Shifted Full-Bridge converter which uses the parasitic leakage inductance of the transformer to achieve soft switching. A practical method to break down the converter losses...
This paper presents a novel algorithm for in situ efficiency estimation for induction motors operating with distorted unbalanced voltages. The proposed technique utilizes the genetic algorithm, IEEE Form F2-Method F1 calculations, large motor test database and a new stray-load loss formula. The technique is evaluated by testing 3 small- and medium-sized induction motors with 11 different combinations...
This paper analyzes two novel methods of torque ripple testing and efficiency evaluation for three-phase induction motor. A high-precision torque sensor and a digital filter are used to observe torque ripple and measure torque value of the induction motor. By using indirect efficiency measurement, temperature influences on the resistance are taken into account and the torque on the shaft could be...
This paper presents a methodology for analysing ac winding loss effects which can be significant when considering high-power density, high-efficiency and high-speed machine designs. A combination of finite element analysis (FEA) and experimental measurement has been employed to evaluate the components that contribute to the overall winding power loss. A number of conductor profiles and conductor arrangements...
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