The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jasmin Smajic - One of the best experts on this subject based on the ideXlab platform.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
Emmanuel Vincent - One of the best experts on this subject based on the ideXlab platform.
-
Underdetermined instantaneous audio Source separation via local Gaussian modeling
2009Co-Authors: Emmanuel Vincent, Simon Arberet, Rémi GribonvalAbstract:Underdetermined Source separation is often carried out by modeling time-Frequency Source coefficients via a fixed sparse prior. This approach fails when the number of active Sources in one time-Frequency bin is larger than the number of channels or when active Sources lie on both sides of an inactive Source. In this article, we partially address these issues by modeling time-Frequency Source coefficients via Gaussian priors with free variances. We study the resulting maximum likelihood criterion and derive a fast non-iterative optimization algorithm that finds the global minimum. We show that this algorithm outperforms state-of-the- art approaches over stereo instantaneous speech mixtures.
-
musical Source separation using time Frequency Source priors
IEEE Transactions on Audio Speech and Language Processing, 2006Co-Authors: Emmanuel VincentAbstract:This article deals with the Source separation problem for stereo musical mixtures using prior information about the Sources (instrument names and localization). After a brief review of existing methods, we design a family of probabilistic mixture generative models combining modified positive independent subspace analysis (ISA), localization models, and segmental models (SM). We express Source separation as a Bayesian estimation problem and we propose efficient resolution algorithms. The resulting separation methods rely on a variable number of cues including harmonicity, spectral envelope, azimuth, note duration, and monophony. We compare these methods on two synthetic mixtures with long reverberation. We show that they outperform methods exploiting spatial diversity only and that they are robust against approximate localization of the Sources.
Michael Schueller - One of the best experts on this subject based on the ideXlab platform.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
Sunjoo Hong - One of the best experts on this subject based on the ideXlab platform.
-
a low power 2 4 ghz current reused receiver front end and Frequency Source for wireless sensor network
IEEE Journal of Solid-state Circuits, 2007Co-Authors: Taeksang Song, Hyoungseok Oh, Euisik Yoon, Sunjoo HongAbstract:In this paper, we present a receiver front-end and a Frequency Source suitable for wireless sensor network applications, in which power consumption is severely restricted under several milliwatts. For such an extremely low-power receiver, current-reusing and Frequency multiplying schemes are proposed for both the RF front-end and Frequency Source. The proposed front-end achieves a conversion gain of 30.5 dB and a noise figure of 10.2 dB at the 10-MHz intermediate Frequency (IF), taking only 500-muA bias current from a 1.0-V supply voltage. The measured phase noise of the fabricated Frequency Source is -115.83 dBc/Hz at 1 MHz offset from a 2.2-GHz center Frequency, taking 840 muA from a 0.7-V supply. The front-end performance is compared with the previously reported low-power front-ends operating in similar Frequency ranges
Giuliano Gatti - One of the best experts on this subject based on the ideXlab platform.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
-
development of a pulsed high Frequency Source for testing cellulosic insulation material for high voltage solid state transformer applications
IEEE International Conference on High Voltage Engineering and Application, 2018Co-Authors: Michael Schueller, Giuliano Gatti, Schmitt Ph, S Jaufer, Krause Ch, Richard Christen, Jasmin SmajicAbstract:Solid state transformers (SSTs) are believed to play a major role in the near future due to their additional features compared to conventional transformers. SSTs are a combination of power electronics and a conventional transformer. The function of this device is to commute the signal into the kHz range before it is transformed to another voltage with the conventional transformer within the SST. Many different topologies for the power electronic part in SST applications have been implemented and presented in literature. Many newer publications use SiC MOSFETs due to their high achievable blocking voltage and fast switching speed. The transforming element in SST applications, where a higher amount of power is needed, will still be a conventional transformer with conventional insulation. Thus the oil paper insulation system has to be investigated experimentally in respect of the higher Frequency stress. For these investigations a Source is needed that can deliver voltage stress which is present in SST applications. Thus a pulsed high Frequency (HF) Source had to be developed to be able to test and study the insulation in detail. In this publication we show the development and function of such a pulsed HF Source for voltages up to 5 kV. Also first measurement results of tests at 20 kHz and 40 kHz are presented and compared with 50 Hz measurements.
