J. Melkebeek

Learn More
To supply a high voltage load from a low voltage source (e.g. battery pack) often a converter is required with a high conversion ratio. Boost converter topologies with coupled inductors have emerged displaying a high efficiency, a low overall component count, a simple topology, and the need for only a single low-voltage active switch. However, in some(More)
Resonant techniques like zero-voltage switch (ZVS) and zero-current switch (ZCS) are widely applied to raise the switching frequency and efficiency of converters. An important subclass of converters using resonant techniques, is formed by ZVS half- and full-bridge converters. While different varieties of this subclass of converters have been reported, the(More)
Power factor correction (PFC) converters with low harmonic input resistance are desirable loads to support the reduction of the harmonic distortion on the feeding grid. Therefore, a novel control strategy is proposed. Whereas previously proposed controllers tried to obtain a resistive behavior of the converter with a constant input impedance for all(More)
The authors present a fixed switching frequency pulse width modulated (PWM) inverter based induction motor direct torque control. The proposed method controls motor torque and stator flux amplitude and is developed in discrete time to allow implementation on microcontrollers or digital signal processors (DSP). The proposed control requires knowledge of a(More)
Zero-crossing distortion in modern rectifiers and inverters may have different causes: the commutation dead time, the use of diode bridge rectifiers, discontinuities in the PWM-generation. In this paper, another cause of zero-crossing distortion is analysed: when a security dead time is inserted between the gate signals of two switches in the same leg, some(More)
A novel two-phase zero-voltage switching boost power converter is proposed. The proposed converter overcomes some limitations of the DC/DC resonant-type converter, such as high circulating energy, limited ZVS load range and complex transformer. The turn-on instant of the switches comes after zero-voltage detection of the voltage across them and there is no(More)
It has been demonstrated in the literature that saturation in electrical machines leads to a flux linkage between orthogonal axis windings. Hence this magnetic coupling should be included in the mathematical model for the (small signal) dynamic analysis of the saturated machines. In salient-pole-type machines, the assumed saturation models do not answer the(More)
The amount of non-linear and unbalanced loads (such as adjustable speed drives and personal computers) connected to the electric power system is steadily growing. As a result, the power quality i.e. the reliability of the energy supply and the quality of the voltage waveform, may be severely degraded. Especially in the case of resonances, severe voltage(More)
This paper introduces an improved zero-voltage and zero-current-switching half bridge (ZV-ZCS HB) DC/DC converter for medium and high-power applications. The soft switching is obtained by adding only small capacitors. The operation principle and design procedure are presented together with an analysis of the total losses in the switch. By using the proposed(More)
  • 1