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Interleaved switching of parallel inverters has previously been proposed for efficiency/size improvements of grid connected three-phase inverters. This paper proposes a novel interleaving method which practically eliminates insulated gate bipolar transistor (IGBT) turn-on losses and drastically reduces diode reverse recovery losses. The reduction in switching losses are obtained by interleaving two...
Power semiconductor devices made with wide-bandgap (WBG) materials such as Silicon Carbide (SiC) are improving the energy conversion efficiency, power density, and switching performance of converters. This paper presents a comparative performance evaluation of Si IGBT, SiC JFET, and SiC MOSFET power devices implemented in an otherwise identical, non-isolated dc-dc boost converter. Switching characteristics...
This paper compares several multilevel topologies (3L-NPC, 3L-TNPC, 5L-ANPC and 5L-SMC converters) as an alternative to the 2L converter for low voltage applications, using low voltage IGBT modules. The comparative evaluations are made considering figures of merit such as the total losses and their power loss distribution, the amount of devices of each converter, the maximum output power, the harmonic...
There is a variety of converter topologies applicable for switched reluctance machine. The simplicity, reliability, and suitability are key factors to consider for converter selection for the motor. The selection of switching schemes is also of worth importance for either converter selection. This paper presents the calculation method of switching losses in asymmetrical H-bridge converter for the...
This paper proposes an active current source gate drive (ACSD) method based on voltage controlled current source(VCCS) feedback control strategy for high-power IGBTs. Unlike the common voltage source gate drive, the proposed ACSD method provides constant drive current to charge and discharge an IGBT. With a large gate drive current, high switching speed and low switching losses can be achieved in...
This paper evaluates the state of the art in switching and conductivity losses for ac drives fed from three-phase voltage source cascaded multilevel inverters. Cascaded multilevel inverters schemes having relevance for industrial application are described and their respective advantages and disadvantages are explained. Secondary effects such as the influence of current displacement factor, dependent...
In this paper, a comparative performance of a newly proposed standalone solar PV (Photo-Voltaic) power generating system is presented along with a conventional PV generating system. The new PV generating system is using isolated dc-dc Cuk converter which consists of a high frequency transformer and a conventional PV system consists of a line frequency transformer. Both these configurations are compared...
In this paper, an FPGA-based on-line switching loss measurement system for an advanced condition monitoring system is presented. For this purpose, an on-line measurement system for the semiconductor voltage and current transients integrated at the gate-driver voltage level is proposed. This system and the switching loss calculations are verified by experimental results.
Power density increase is one of the challenges of Wind Power Converters and the use of Silicon Carbide semiconductors is a promising solution due to the enhanced performance in terms of switching behaviour. This is demonstrated on an existing Wind Power Converter with a hybrid module of SiC based Diode and Silicon IGBT.
An advanced gate drive unit for 1.2 kV IGBT modules has been developed. It includes two main features: limitation of the collector-emitter voltage slope and of the collector-emitter peak voltage. This is achieved through a feedback loop with a capacitive/resistive voltage divider coupled to the gate-emitter voltage of the IGBT. For the studied case a reduction of the switching losses of around 25%...
This paper investigates the switching performance of six-pack SiC MOSFET and Si IGBT modules for motor drive applications. Both the modules have same packaging and voltage rating (1.2 kV). The three bridge legs of the modules are paralleled forming a single half-bridge configuration for achieving higher output power. Turn-on and turn-off switching energy losses are measured using a standard double...
The permanent demand on increasing output power and density of Medium Voltage Converters in different applications is pushing up the need of new devices with higher current rates in the market. Semiconductor manufacturers are evolving their technology in order to achieve higher current rates [1-4], especially based on higher junction temperature operation, new chip layout which enhances the thermal...
The switching frequency at which the inverter operates is an important parameter that significantly affects the operation of the inverter. In this paper, a new variable switching frequency algorithm is proposed in which the switching frequency is varied in response to the variation in the operating conditions. The proposed algorithm is based on multi-objective optimization problem formulation such...
The modular multilevel converter (MMC) is the most promising solution to connect HVDC grids to an HVAC one. The installation of new equipment in the HVDC transmission systems requires an economic study where the power losses play an important role. Since the MMC is composed of a high number of semiconductors elements, the losses estimation becomes complex. This paper proposes a simulation-based method...
In this paper, the effect of different stray inductances on the performance of various combinations of different types of IGBTs and freewheeling diodes was studied. Therefore, a fast switching IGBT4 HighSpeed was combined with either a SiC Schottky diode or a Si bipolar diode. It was analyzed how the switching losses are affected by the type of the freewheeling diode, the stray inductance and to what...
Recently the main requirements found in the market are further downsizing and higher efficiency of power conversion systems. Enhanced power density of the power modules will be the key to succeed. The increasing package reliability in higher junction temperature operation will be the major challenge. By further improvement of the chip characteristics and the development of new high reliability package...
This paper presents a modulation technique, which combines the known space-vector-pulse-width-modulation (SVPWM) and the discontinuous-pulse-width-modulation (DPWM). This enables the possibility to set the switching losses freely within a certain border band. A possible area of application is the reliability of IGBT-inverters modules, where junction temperature swings can be reduced by influencing...
In this paper the switching speed limits of high power IGBT modules are investigated. The limitation of turn-on and turn-off switching speeds of the IGBTs are experimentally detected in a pulse tester. Different dc-bus stray inductances are considered, as well as the worst case scenario for the blocking dc-link voltage. Switching losses are analyzed upon a considerable variation of resistor value...
Analytical methods of power semiconductor loss in a two-level inverter conventionally assume a sufficient number of switching pulses per electrical fundamental cycle. This paper presents a complete analytical expression of power loss even under an infrequent switching condition. The proposed formulae are demonstrated with HEPWM patterns.
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