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This paper developed a novel quad-inverter configuration for multilevel six-phase asymmetrical open-winding AC converter. Proposal found to be suited for (low-voltage/high-current) applications such as AC tractions and ‘More-Electric Aircraft’ propulsion systems. Modular power circuit comprises of standard four three-phase voltage source inverter (VSI) and each connected to the open-end windings....
In this paper, a novel soft switching power factor correction (PFC) interleaved AC-DC boost converter is proposed. In the proposed novel converter, all of the semiconductor devices operate with soft switching. The main switches turn on with zero voltage transition (ZVT) and turn off with zero current transition (ZCT) without any extra voltage or current stresses. Auxiliary switch turns on with zero...
In this paper the asymmetrical pulse width modulation (APWM) is proposed for the control of galvanically isolated impedance-source series resonant DC/DC converters in the buck mode. Contrary to the variable frequency control, which is most widespread control technique of the series resonant converters, the APWM features fixed frequency operation and reduced circulation energy of the converter. This...
Gallium Nitride (GaN) based power devices have the potential to achieve higher efficiency and higher switching frequency than those possible with Silicon (Si) power devices. In literature, GaN based converters are claimed to offer higher power density. However, a detailed comparative analysis on the power density of GaN and Si based low power dc-dc flyback converter is not reported. In this paper,...
Aluminum electrolytic capacitors (AECs) are widely used in power electronic converters for filtering, buffering, bypass and storage purpose. Typical service life of AECs varies between 1,000 to 12,000 hours at rated condition. Operational life of these capacitor decreases due to various electrical and environmental parameters, thereby limiting the life of the converter system. Typically, capacitors...
The use of the coupled inductors in the multipulse matrix converter (MC) systems is described in the paper. The possible arrangements of the system are given together with the description of their operation parameters. Moreover, the influence of the system's topology on the output power quality is also presented. The invented converter structures evaluation results are given in the form of simulation...
In this paper the theory and simulation results of the series resonant inverter / converter are presented. In this work the authors carried out a detailed comparative analysis of results obtained using the method of AC analysis in the steady state for the first harmonic with the results of computer simulation. The AC analysis under certain conditions can lead to errors disqualifying this method. In...
This paper presents an experimental study of the half-bridge based on high voltage enhancement mode GaN high electron mobility transistors (HEMTs). It was tested with pure inductive load at various switching frequencies and power levels to verify gate driver and cooling system. All tests performed confirm excellent performance of the 650 V GaN HEMTs and the developed half-bridge stage may be applied...
The paper presents the control system and selected results of experimental tests of the ac/dc power converter consisting of 18-pulse diode rectifier on the basis of coupled reactors and a serial active power filter. Three configurations of the 150kVA converter were tested experimentally and compared: 18-pulse diode rectifier with and without additional grid reactor and the rectifier integrated with...
In this paper, a novel input-series output-parallel (ISOP) power electronics system is studied. It is made up of cells based on full soft-switching current-fed naturally clamped DC-DC converter topology. This system could be advantageous for power supply of high voltage remote systems with DC voltage, since parasitic inductance of the wire can be utilized as an energy storage. Three different approaches...
Aside from providing voltage and current of sufficient values, a gate driver of a SiC MOSFET must also be durable enough to keep operating properly in given place of a main circuit of a converter. A high-side SiC MOSFET constitutes a challenge to being driven properly, since a high-voltage potential becomes repetitively applied at an output of the gate driver. In order to limit a resulting flow of...
Multilevel inverters become more and more popular, especially in the medium or high voltage and high power applications. Unfortunately, some of inverter topologies require additional DC bus voltage balancing systems. This paper presents a novel approach to such systems, which is based on a multiple terminal DAB converter. Along with the voltage balancing function the proposed solution enables the...
This paper presents the research results of an optimized DC-DC voltage doubler based on a high-frequency resonant switched-capacitor (SC) topology. The converter utilizes a low weight PCB-type planar choke, and can be attractive for fuel cell-or battery-supplied systems which operate from low voltage where a voltage boost is needed. The optimization aims at minimizing power losses in the converter...
This paper presents a Model Predictive Control (MPC) of three-phase three-level Neutral-Point-Clamped (NPC) quasi-Impedance Source (qZS) inverter. This topology features a wide range of voltage gain that is suitable for applications in renewable energy based power systems where the output of the renewable energy sources varies widely with operating conditions such as wind speed, temperature, and solar...
This paper is devoted to analyses of the boost converter using electrothermal average models. The modified forms of electrothermal average models of the diode — transistor switch and the inductor dedicated for SPICE are shown. The value of parameters of the considered models are estimated on the basis of the catalogue data for the considered converter components. The computations were performed for...
This paper presents selected issues concerning realization of high precision high current source for special applications, where high demands of output parameters of such device are required. A new 80 kW prototype of modular high precision high current source is presented, where output current accuracy reaches 5×10−5. This paper presents also results of operation of the simulation model and of the...
A multi transformer flyback converter topology for supplying transistor drivers is presented. The topology presents some advantages over typical multi output single transformer, as reduction of effective leakage inductance, equal magnetic coupling between primary and secondary circuits and better isolation between outputs. Simulation study carried out in the LTSpice IV program and preliminary experimental...
A novel approach to the voltage source inverters (VSI) construction is presented in the paper. The invented inverter structures allow to operate several DC/AC converters in parallel resulting in lower voltage distortions at extremely low switching frequency. The research presented in the paper describes such a parallel operation of the VSI's which is possible thanks to the use of coupled inductors...
The new technology of wide band gap semiconductors is said to outperform up-to-date silicon devices. High voltage Gallium Nitride (GaN) transistors, now emerging in the market, have even three times shorter switching times and even four times smaller energy losses compared to the best in-class Si devices. In this paper the performance of a 650 V GaN SSFET is evaluated and compared with the newest...
Electric arc welding and cutting processes require delivery of the electrical power covering the broad range of the output voltage and the output current. Direct approach in the design to cover all required range leads to oversizing of the applied elements of the power conversion. The solution of the coverage the high voltage in the low current range, needed for the welding by means of the electrodes...
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