Patent application number | Description | Published |
20130141950 | POWER CONVERTER AND INTEGRATED DC CHOKE THEREFOR - A power conversion system and a DC link choke therefore are presented, in which a continuous core structure is provided with first and second legs around which four or more windings are located, with one or more shunt structures providing a magnetic flux path between intermediate portions of the first and second legs. | 06-06-2013 |
20140042817 | METHOD AND APPARATUS FOR BYPASSING CASCADED H-BRIDGE (CHB) POWER CELLS AND POWER SUB CELL FOR MULTILEVEL INVERTER - Bypassing methods and apparatus are presented along with power cells and sub cells for multilevel inverters in which DC current flow into a DC link capacitance is interrupted and a bypass switch is closed across a power cell or sub cell output to selectively bypass a power stage of a multilevel inverter. | 02-13-2014 |
20140265596 | METHOD AND APPARATUS FOR ISLANDING DETECTION FOR GRID TIE CONVERTERS - Methods and apparatus are presented for unintentional islanding detection for grid tie converters in which the phase angle disturbance is introduced by modification of grid side converter switching control signals and a mismatch of reactive power between generation and the grid load is formed upon the occurrence of unintentional islanding, where the applied phase disturbance is determined according to two pre-defined curves to form an equivalent positive feedback at different frequencies to prevent the converter from forming an island at a new stable frequency after the grid is disconnected. | 09-18-2014 |
20140268928 | POWER CELL BYPASS METHOD AND APPARATUS FOR MULTILEVEL INVERTER - Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass. | 09-18-2014 |
20140268953 | ACTIVE FRONT END POWER CONVERTER WITH BOOST MODE DERATING TO PROTECT FILTER INDUCTOR - Methods and apparatus are presented for controlling a power converter to protect input filter inductors from overheating, in which an active front end (AFE) rectifier is operated in a boost mode to provide a boosted DC voltage at a derated output current value selected according to the DC bus voltage boost amount corresponding to a maximum load condition for which the filter inductors will not overheat. | 09-18-2014 |
20140268954 | METHODS AND APPARATUS FOR CONTINUOUS AND DISCONTINUOUS ACTIVE RECTIFIER BOOST OPERATION TO INCREASE POWER CONVERTER RATING - Power conversion systems and operating methods are presented in which an active front end rectifier is operated in a boost mode using discontinuous pulse width modulation in a first range of DC bus voltage boost amount, and continuous space vector pulse width modulation is used in a second range, with the ranges being correlated to output derating with respect to filter inductor magnetics in the first range and to rectifier switching loss derating and the second range. | 09-18-2014 |
20150097571 | APPARATUS AND METHOD FOR AUTOMATIC GROUND FAULT LOCATION DETERMINATION IN HIGH RESISTANCE GROUNDED MOTOR DRIVE SYSTEM - A PLC or other industrial controller programmed to locate ground faults in a networked high resistance grounded multi-drive system through network communications messaging to automatically place networked motor drives in various operational states to isolate individual drives for ground fault identification testing and selectively identify individual drives as suspected ground fault locations. | 04-09-2015 |
20150098257 | MULTIFUNCTION POWER CONVERTER WITH OPTION FOR INTEGRATED MAGNETICS - Power converter modules and parallel conversion systems are presented in which the modules are provided in a rollable enclosure having AC and DC electrical connections, and an interior including a switching circuit with switching devices individually connected between a corresponding AC node and a corresponding DC node for operation as either a rectifier or an inverter and an internal filter circuit with inductors individually connected between a corresponding AC node of the switching circuit and a corresponding AC electrical connection, with a built-in blower or fan to cool the filter circuit during operation. | 04-09-2015 |
20150145462 | METHOD AND APPARATUS FOR CURRENT AUTO BALANCING FOR PARALLEL CONVERTER SYSTEMS - Parallel converter current imbalance control apparatus and methods in which individual converter AC currents are measured for each phase, and the AC voltage control modulation indices associated with the converters having the highest and lowest AC currents for a given phase are adjusted to counteract current imbalance between the converters. | 05-28-2015 |
20150229257 | DOUBLE FED INDUCTION GENERATOR (DFIG) CONVERTER AND METHOD FOR IMPROVED GRID FAULT RIDETHROUGH - A double fed induction generator (DFIG) converter, methods and computer readable mediums are presented in which rotor side current spikes are attenuated by selectively activating at least one series damping circuit to conduct current through a series damping circuit resistance coupled in series between one or more DFIG rotor leads and a grid side converter in response to a grid fault occurrence or a grid fault clearance, and selectively bypassing the series damping circuit resistance after activating the series damping circuit. | 08-13-2015 |
20150318791 | MOTOR DRIVE WITH SILICON CARBIDE MOSFET SWITCHES - Motor drive power conversion systems are provided including a rectifier and a switching inverter, wherein the switching devices of the rectifier, the inverter and/or of a DC/DC converter are silicon carbide switches, such as silicon carbide MOSFETs. Driver circuits are provided for providing bipolar gate drive signals to the silicon carbide MOSFETs, including providing negative gate-source voltage for controlling the off state of enhancement mode low side drivers and positive gate-source voltage for controlling the off state of enhancement mode high side drivers. | 11-05-2015 |
20150355259 | FILTER CAPACITOR DEGRADATION IDENTIFICATION USING MEASURED AND EXPECTED VOLTAGE - Methods and apparatus are presented for detecting degrading filter capacitors in motor drives or other power converters, in which an expected DC equivalent voltage and a measured DC equivalent voltage are computed according to sampled filter circuit currents and voltages, and compared to selectively identify filter capacitor degradation conditions in a power converter filter circuit. | 12-10-2015 |
20150355262 | APPARATUS AND METHOD FOR AUTOMATIC GROUND FAULT LOCATION DETERMINATION IN HIGH RESISTANCE GROUNDED MOTOR DRIVE SYSTEM - Methods an apparatus are presented for identifying ground fault locations in multi-drive systems in which individual drives perform self-diagnosis for detected faults based on an identified fault signal frequency while the system drives continue operation, and a ground fault location system identifies suspected drives and individually confirms or exonerates individual drives by selective command speed adjustment while the drives remain operational within system tolerance ranges. | 12-10-2015 |
20160006367 | METHODS AND POWER CONVERSION SYSTEM CONTROL APPARATUS TO CONTROL IGBT JUNCTION TEMPERATURE AT LOW SPEED - Methods, apparatus and computer readable mediums are presented for controlling a multiphase inverter in which third harmonic injection pulse width modulation (THIPWM) is used for generating inverter switching control signals at or above a non-zero threshold inverter output frequency, and high frequency injection discontinuous pulse width modulation (HFIDPWM) is used for inverter output frequencies below the threshold, where the threshold frequency corresponds to a threshold period less than or equal to the thermal impedance time constant of the inverter switching devices, and the injected high frequency component for HFIDPWM corresponds to a common mode period less than the thermal impedance time constant to mitigate thermal stress on the inverter switches and low speed inverter output derating. | 01-07-2016 |
20160111967 | POWER CELL BYPASS METHOD AND APPARATUS FOR MULTILEVEL INVERTER - Multilevel inverters, power cells and bypass methods are presented in which a power cell switching circuit is selectively disconnected from the power cell output, and a bypass which is closed to connect first and second cell output terminals to selectively bypass a power stage of a multilevel inverter, with an optional AC input switch to selectively disconnect the AC input from the power cell switching circuit during bypass. | 04-21-2016 |
20160126861 | ADJUSTABLE PWM METHOD TO INCREASE LOW SPEED STARTING TORQUE AND INVERTER VOLTAGE MEASUREMENT ACCURACY - Methods, control apparatus and computer readable mediums are presented for controlling a switching inverter in which a controller selectively suspends PWM carrier signals to provide inverter switching control signals using zero vectors in response to a maximal pulse width value for a present PWM half cycle being greater than a threshold value, and accumulates a present output control value for individual output phases for use in a subsequent PWM half cycle for selective effective reduction in switching frequency for low-speed operation while maintaining high frequency control loop sampling. | 05-05-2016 |
Patent application number | Description | Published |
20160121566 | RUBBER V-BELT YARN BLANK COATING AND CUTTING DEVICE - A rubber V-belt yarn blank coating and cutting device is described herein. The rubber V-belt yarn blank coating and cutting device is numerically controlled and includes a frame and a base compound rubber leading-out device, a base compound rubber conveying device, and a base compound rubber coating and cutting mechanism sequentially disposed on the frame. The base compound rubber coating and cutting mechanism includes a driving roller and a driven tensioning roller disposed on the frame and further includes grouped round cutting knives and a squeezing roller. The squeezing roller is positioned between the driving roller and the driven tensioning roller, and the grouped round cutting knives with a sliding mechanism are disposed above the squeezing roller. The coating and cutting device in the present invention is simple in structure, high in cutting precision, labor efficiency and operational safety, and convenient to mount. | 05-05-2016 |
20160121567 | RUBBER V-BELT EXTRUSION MOLDING APPARATUS AND METHOD - Rubber V-belt extrusion molding apparatus and method are described herein. The rubber V-belt extrusion molding apparatus includes an extrusion device, a conveying belt, a cooling device, a storage device, a detection device, a rubber coating and cutting device, and a canvas wrapping device. A material is extruded by the extrusion device to form base compound rubber. The conveying belt conveys the base compound rubber. The cooling device cools the base compound rubber on the conveying belt. The storage device stores the base compound rubber cooled by the cooling device and conveys the base compound rubber to the rubber coating and cutting device. The detection device detects the cooled base compound rubber before storing. The rubber coating and cutting device coats a yarn blank with the base compound rubber conveyed by the storage device to form a yarn core. The canvas wrapping device wraps the yarn core with a rubberized canvas. | 05-05-2016 |
Patent application number | Description | Published |
20140179325 | METHOD AND SYSTEM FOR SUPPORTING FAST RECOVERY OF USER EQUIPMENT - A method for supporting fast recovery of a User Equipment (UE) includes performing, by a serving base station, UE context synchronization for one or more other base stations in a related small cell cluster when a UE accesses the serving base station, performing, by a base station that the UE performs a radio resource control (RRC) connection re-establishment, the RRC connection re-establishment for the UE according to UE context saved in a synchronization process. The present also discloses another method and system for supporting UE fast recovery. By applying the technical solution disclosed by the present disclosure, when the UE moves in a small cell scenario, the UE can be recovered quickly in the case of a failure, so as to avoid the UE returns to an idle mode, avoid data loss, guarantee business continuity, and improve UE experience. | 06-26-2014 |
20150282152 | METHOD FOR ALLOCATING AGGREGATE MAXIMUM BIT RATE OF UE, METHOD FOR ALLOCATING AGGREGATE BIT RATES OF NON-GBR SERVICES AND BASE STATIONS - A method for allocating an aggregate maximum bit rate (AMBR) of a user equipment (UE) includes obtaining, by a master base station (MeNB), the AMBR of the UE (UE-AMBR), and obtaining, by the MeNB, information for allocating an AMBR of a secondary base station (SeNB), and allocating, the AMBR of the SeNB according to the information, wherein a sum of the AMBRs of the MeNB and the SeNB is not greater than the UE-AMBR. A method for coordinating aggregate bit rates of non-GBR services between base stations includes sending, by an SeNB, information for allocating an aggregate maximum bit rate (AMBR) of the SeNB to an MeNB, and receiving, by the SeNB, the AMBR allocated by the MeNB. | 10-01-2015 |