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This paper presents simulation and measurement loss determination results for different switching schemes in a frequency converter using CoolMOS transistors. Different Space Vector Modulation (SVM) schemes has been investigated. The simulation and measurement results show a close correlation. The losses in the MOSFETs have been determined with temperature measurement resulting in high accuracy. It...
Some current transformers can be very easily affected by dc component of primary current. The behavior of such transformers can be different in comparison with normal conditions. The errors of power measurements arise in order of units of percent and can be both positive and negative according to the type of load for some type of current transformers. The errors are mainly caused by change of phase...
In this paper, a novel converter, named negative-output KY buck-boost converter, is presented herein, which has no bilinear characteristics. First of all, the basic operating principles of the proposed converter are illustrated in detail, and secondly some simulated and experimental results are provided to verify its effectiveness.
This paper explores the simulation technique of the harmonic current under phase angle control of a universal motor. The harmonic current generates the damage-by-fire accident of the transformer and phase advance capacitor, both of which are connected to an electric power system. This problem has warranted new standards imposed by the IEC. Comparatively, the universal motor for vacuum cleaners is...
A new very high efficiency 10 kW isolated R4 boost converter for low-voltage high-power fuel cell applications is presented. Using a new concept for partially paralleling of isolated boost converters, only the critical high ac-current parts are paralleled. Four 2.5 kW power stages, consisting of full-bridge switching stages and power transformers, operate in parallel on primary side and in series...
This paper presents design and implementation of a bi-directional inverter, including a high frequency transformer, a push-pull switch configuration at the dc side, a cycloconverter at the ac side, and a dsPIC controller. The dc/ac conversion is achieved with a phase-shifted control strategy. In addition, this topology also can achieve an ac/dc conversion with the PFC function. In this circuit, the...
In recent years there has been much attention on the proportional plus resonant (P-R) current regulators for grid connected voltage-source converters (VSCs). Many strategies have been proposed for use of P-R controllers both in the stationary and in the synchronous reference frame that demonstrate VSC performance can be improved under non-ideal supply conditions such as supply asymmetry and supply...
In this paper, first, an equivalent scalar dynamic model for the three-phase brushless dc (BLDC) motor is derived to simplify the control of the electric vehicle (EV) drive. Then, an equivalent armature current sensing technique is proposed for synthesizing the three-phase line current by using the low-side switches of the inverter as current sensors. No additional current sensors are required and...
System-on-chip (SoC) mobile thin-film transistor (TFT) liquid-crystal display (LCD) drivers are, to a certain extent, inadequate to support portable devices that require higher driving currents for their high resolution and large LCD panels. In this paper, we will show how a simple boost converter can be designed and used in the display driver for high current demand TFT-LCD panels. The proposed driver...
The paper presents an investigation on the direct instantaneous torque control (DITC) of a 1-hp four-phase 8/6 switched reluctance motor (SRM). In the proposed technique, the instantaneous phase torque was estimated in real-time using a pre-stored look-up table of measured static torque, T(i, ??), where phase current and phase flux linkage were input parameters. Therefore, a high-resolution encoder...
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