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Inverter dead-time effects have been investigated in detail in the past for three-phase drives supplied from a three-phase voltage source inverter (VSI). A similar study has never been conducted in conjunction with multi-phase (more than three phases) drives, supplied from multi-phase VSIs. Regardless of the type of ac machine and its number of phases, the power supply of the drive is typically a...
In several IGBT applications, power cycling capability of the modules determines the lifetime of the device under given conditions. Modern power modules are manufactured in typical structures; in focus are standard modules with Al2O3 ceramics. Weak points regarding the module lifetime are the substrate solder joint, the chip solder and the bond wires. Typical failure mechanisms of these interconnection...
The family of intelligent IPS-drivers was invented to drive high power IGBT modules with blocking voltages up to 6,500 V. They may be used use in industrial drives, power supplies, transportation, renewable energies as well as induction heating applications. The IPS- drivers decrease the switching losses and offer a reliable protection for high power IGBT modules. Varying the software enables an easy...
Induction heating is an effective method for metal heating. One of the unique applications of induction heating, there is a superheated steam generator. We propose a novel superheated steamer having both advantages for cooling of induction coil and for warming of water in advance. In the paper, the structure and behavior of proposed steamer driven by high frequency inverter are described, and its...
A gate drive circuit for a silicon carbide (SiC) JFET is introduced from the standpoint of application to power conversion circuit. This gate drive circuit enables normally-on JFETs as close as normally-off devices at high switching frequency. The voltage and current responses of the implemented circuit are discussed under loads at the switching frequencies over 1 MHz.
In IGBTs avalanche breakdown usually sets on in the edge termination structure. In consequence of electrical crosstalk, the destruction mechanism in very thin devices is confined to the neighboring cells in the active part of the chip. Thus, in order to achieve the largest possible safe-operating area, design optimization has to focus on the edge termination structure and the neighboring active cells...
With its new SineFormertrade EPCOS is introducing a fully new output filter technology for frequency converters. In contrast to conventional filter topologies the new SineFormertrade simultaneously converts the phase-to-phase voltage into a sinusoidal signal, damps the common mode currents and also forms the conductor-to-ground voltage to sine shaped voltage. This offers users a number of key benefits...
This paper presents research motivated by industrial demand for special traction drive topology devoted to minimization of traction transformer weight against topology with classical 50 Hz traction transformer. The main attention has been given to the control strategy of the special traction drive topology for AC power systems. The proposed converter control algorithm of innovative traction topology...
This paper proposes an electronic device that emulates the electric power generated by complete wind systems in order to test alkaline water electrolysers under real operating conditions typical of wind regimes. This Wind Emulator has a rated power of 10 kW. It is first validated by means of experimental tests in order to probe its performance concerning quickness, accuracy and reliability. Afterwards,...
This paper presents a new approach for hardware in the loop testing of voltage source inverters for drive applications. For this purpose the inverter is not connected to a real machine, but to a second power inverter instead, which acts like an electrical machine. Thereby the inverter under test can operate in its normal mode, which in the most of the cases is a field oriented current control with...
This work is intended to describe the origin of EMI from a state of the art flyback power supply and to explain some experimental techniques with current and near field probes useful to pass EMC regulations, to optimize a design or, simply, to better understand the culprits of the problem. The dialogue (poster) session in EPE09 is appropiated to show the technique in a practical way to delegates interested...
While supercapacitors offer high power density, high cycling capability and mechanical robustness, voltage and current ripple from downstream PWM converters can result in their overcharging or heating resulting in their lifetime reduction. This paper discusses how a simple novel design scheme of using a very low value series inductance significantly increases capacitor lifetime.
This paper presents research motivated by industrial demand for special traction drive topology devoted to minimization of traction transformer weight of traction vehicles. The main attention has been given to the special traction drive topology for AC power systems: input high voltage trolley converter (single phase) - middle frequency transformer (single phase) - output converter (single phase voltage-source...
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