Patent application number | Description | Published |
20130063981 | MULTILEVEL CONVERTER AND A CONTROL METHOD FOR OPERATING A MULTILEVEL CONVERTER - A converter includes an active stage for converting an AC input voltage at an AC input into an intermediate DC voltage, and a DC/DC converter for transforming the intermediate DC voltage into an output DC voltage at a DC output. The DC/DC converter has a resonant transformer formed by a resonant circuit and a transformer. The converter also includes control unit configured to actively operate the active stage only based on an output DC voltage of the DC/DC converter, an input voltage, and an input current of the converter, and to operate the DC/DC converter in an open loop mode. A method for operating such a converter is also provided. | 03-14-2013 |
20140313789 | DISTRIBUTED CONTROLLERS FOR A POWER ELECTRONICS CONVERTER - A distributed controller module for controlling a power electronics building block of a power electronics converter includes a plurality of gate drivers for controlling power electronics switches of the power electronics building block, a first fiber optics communication interface for communication with a central controller module, a second fiber optics communication interface for communication with a second distributed controller module for controlling a second power electronics building block of the power electronics converter, and a processor unit for controlling the gate drivers and transmitting and receiving data via the first fiber optics communication interface and the second fiber optics communication interface. | 10-23-2014 |
20150180352 | CONTROLLING A MODULAR CONVERTER - A modular converter is disclosed which includes plural converter cells connected in series on a first side, and connected on a second side, wherein each converter cell includes an AC-to-DC converter connected to the first side and a DC-to-DC converter connected to the second side. Exemplary embodiments estimate power transferred by the modular converter; compare the transferred power with a threshold value; when the transferred power exceeds the threshold value, operate in a normal load operation mode; when the transferred power is below the threshold value, operate in a low load operation mode with reduced switching losses. | 06-25-2015 |
Patent application number | Description | Published |
20120302935 | DEVICES AND METHODS FOR FORMING A FISTULA - Described here are devices, systems and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter which may comprise a fistula-forming element. The fistula-forming element may comprise one or more electrodes, mechanical cutting elements, laser sources, or combinations thereof, and may be used to assist in fistula formation. In some instances, a system may comprise a second catheter, which may comprise a fistula-forming element. One or more of the catheters may comprise one or more markers, magnetic alignment elements, and/or one shape-changing elements. | 11-29-2012 |
20140107642 | DEVICES AND METHODS FOR FISTULA FORMATION - Described here are devices and methods for forming a fistula between two vessels. In some instances, the fistula may be formed between a proximal ulnar artery and a deep ulnar vein. The fistula may be formed using an electrode, and may be formed with a first catheter placed in a first blood vessel and a second catheter placed in a second blood vessel. In some instances, access to the proximal ulnar artery may be achieved through a brachial artery, and access to the deep ulnar vein may be achieved through a brachial vein. | 04-17-2014 |
20150080886 | DEVICES AND METHODS FOR FORMING A FISTULA - Described here are devices, systems and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter which may comprise a fistula-forming element. The fistula-forming element may comprise one or more electrodes, mechanical cutting elements, laser sources, or combinations thereof, and may be used to assist in fistula formation. In some instances, a system may comprise a second catheter, which may comprise a fistula-forming element. One or more of the catheters may comprise one or more markers, magnetic alignment elements, and/or one shape-changing elements. | 03-19-2015 |
20150313668 | DEVICES AND METHODS FOR FORMING A FISTULA - Described here are devices, systems and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter which may comprise a fistula-forming element. The fistula-forming element may comprise one or more electrodes, mechanical cutting elements, laser sources, or combinations thereof, and may be used to assist in fistula formation. In some instances, a system may comprise a second catheter, which may comprise a fistula-forming element. One or more of the catheters may comprise one or more markers, magnetic alignment elements, and/or one shape-changing elements. | 11-05-2015 |
Patent application number | Description | Published |
20160126988 | BROADBAND SUPERHETRODYNE RECEIVER WITH AGILE INTERMEDIATE FREQUENCY FOR INTERFERENCE MITIGATION - A broadband superheterodyne receiver. Embodiments include an input for receiving an RF signal including an RF data signal at a carrier frequency. An RF mixer coupled to the input shifts the RF data signal from the carrier frequency to an IF frequency. An IF band pass filter coupled to the mixer has a pass band, and band pass filters the signal near the IF frequency. A spectrum analyzer provides information representative of the spectral characteristics of the received RF signal around the RF data signal at the carrier frequency. An IF controller is coupled to the RF mixer and to the spectrum analyzer. The IF controller: (1) determines an interference-mitigating IF frequency within the pass band of the band pass filter that will result in attenuation of undesired portions of the RF signal, and (2) controls the RF mixer to shift the RF data signal to the interference-mitigating IF frequency. | 05-05-2016 |
20160127009 | PRE-DISTORTION OF RECEIVE SIGNAL FOR INTERFERENCE MITIGATION IN BROADBAND TRANSCEIVERS - A broadband transceiver includes an input to receive an RF signal, an output to output an RF transmit signal, a receiver section coupled to the input, and a transmitter section coupled to the output. A processor coupled to the receiver section and the transmitter section determines and generates an inverse waveform that will result in attenuation of undesired portions of a received RF signal when summed with the received signal, including optionally at one or more of an RF stage and an IF stage. A summing junction coupled between the processor and receiver section sums the inverse waveform with the received signal. | 05-05-2016 |
20160127953 | DYNAMIC AND FLEXIBLE CHANNEL SELECTION IN A WIRELESS COMMUNICATION SYSTEM - A method for operating a downlink transmitter radio to automatically determine transmission parameters includes monitoring the spectral content of a range of frequencies, and identifying, based on the monitored spectral content, spectral characteristics associated with noise or interference. The downlink transmission channel carrier frequency and channel frequency bandwidth are determined based on the spectral characteristics of the interference together with operating requirements of the wireless transmission system. | 05-05-2016 |
20160128010 | SINGLE CARRIER FREQUENCY DOMAIN EQUALIZER TIME SYNCHRONIZATION IN A BROADBAND TRANSCEIVER - A method for operating a receiver in a wireless communication system to synchronize the receiver to a received signal. The received signal is preamble correlated to identify a preamble portion of the signal. Portions of the received signal near the identified preamble portion are processed to determine signal-distorting channel characteristics, such as multipath channel delay spread, of the channel over which the received signal propagated. A digital filter is configured based on the determined channel characteristics to compensate for the signal-distorting channel characteristics, and the received signal is filtered with the configured digital filter. The filtered received signal is second preamble correlated with a second preamble that is different than the first preamble to produce a second preamble correlation. The second preamble correlation is processed to identify delay in the filtered received signal. Portions of the filtered received signal are identified and processed based on the identified delay. | 05-05-2016 |
Patent application number | Description | Published |
20090121125 | Blind Extraction of Pure Component Mass Spectra from Overlapping Mass Spectrometric Peaks - A method of obtaining pure component mass spectra or pure peak elution profiles from mass spectra of a mixture of components involves estimating number of components in the mixture, filtering noise, and extracting individual component mass spectra or pure peak elution profiles using blind entropy minimization with direct optimization (e.g. downhill simplex minimization). The method may be applied to deconvolution of pure GC/MS spectra of overlapping or partially overlapping isotopologues or other compounds, separation of overlapping or partially overlapping compounds in proteomics or metabolomics mass spectrometry applications, peptide sequencing using high voltage fragmentation followed by deconvolution of the obtained mixture mass spectra, deconvolution of MALDI mass spectra in the separation of multiple components present in a single solution, and specific compound monitoring in security and/or environmentally sensitive areas. | 05-14-2009 |
20110135932 | Production of Sulfur-Free Nanoparticles by Yeast - A method of producing sulfur-free nanoparticles involves growing yeast in a growth medium containing a source of an element in a bio-reducible oxidation state (e.g. Se(V1), and, precipitating nanoparticles containing the element in a lower oxidation state (e.g. Se(O)) than the oxidation state of the element in the source. The method advantageously can provide substantially spherical nanoparticles at high production efficiencies. | 06-09-2011 |
20110168881 | PLASMA-BASED DIRECT SAMPLING OF MOLECULES FOR MASS SPECTROMETRIC ANALYSIS - A plasma-based dielectric barrier discharge (DBD) ion source is configured for flowing afterglow sampling and ionization of analytes. A method of direct sampling for mass spectrometric analysis includes providing an afterglow from a dielectric barrier discharge (DBD) plasma device, directing the afterglow with a flow of heated plasma support gas to a sample positioned externally to the DBD device, ionizing at least a portion of the sample with the afterglow and heated gas, and, analyzing ionized species from the sample in a mass spectrometer. A system for mass spectrometric analysis of a sample includes a mass spectrometer having an entrance aperture, and, a dielectric barrier discharge (DBD) ion source having a heated plasma support gas for directing DBD afterglow to a sample positioned between the DBD ion source and the entrance aperture of the mass spectrometer. | 07-14-2011 |
20110306147 | Method of Multiple Spiking Isotope Dilution Mass Spectrometry - A comprehensive approach for interpretation of the multiple spiking isotope dilution results is described herein. It has now been found that a method of multiple spiking isotope dilution analysis for mass spectrometry is possible using an approach that permits precise and simultaneous characterization of m substances from a sample even if species inter-conversion (degradation and formation) has occurred prior to separation. Advantageously, initial and final amounts of involved analytes, conversion extent, conversion degree and rate constants from the results of a single quantitation experiment may be obtained with the present method. In a particularly advantageous embodiment, uncertainty in the characterization of the substances may be estimated more accurately by also estimating increase in the uncertainty due to interconversion of the analytes. | 12-15-2011 |