Patent application number | Description | Published |
20100045108 | Power conversion architecture with zero common mode voltage - A controller for a power conversion system reduces common-mode voltage generated by the power conversion system by imposing a constraint on the control signals applied to the power conversion system. The power conversion system includes a plurality of switching devices that are responsive to control signals provided by the controller to selectively connect each output of the power conversion system to one of a plurality of inputs. The controller generates control signals based on a desired output of the power conversion system. In addition, the controller imposes a constraint on the control signals to reduce the common-mode voltage. The constraint is defined by assigning an integer value to each input of the power conversion system, and requiring that the selective connection of outputs to inputs must result in a sum of integer values equal to zero. | 02-25-2010 |
20110050184 | ACTIVE RECTIFICATION FOR A VARIABLE-FREQUENCY SYNCHRONOUS GENERATOR - An active rectifier controller decouples measurements of the phase and speed of a variable frequency synchronous generator from measurements of the AC output voltage. The active rectifier controller receives position information representative of the rotor position of the VFSG independent of a load connected to the VFSG that is used to determine the phase position and speed of the VFSG. Based on measurements of the generator speed and phase, the active rectifier controller controls the active rectifier to draw AC currents in-phase with the back-electromotive force (BEMF) voltage of the VFSG. | 03-03-2011 |
20110235376 | MULTI-LEVEL PARALLEL PHASE CONVERTER - A multi-level parallel phase power converter has a power source, a converter, and an electrical node. The converter includes multiple converter modules. Each of the converter modules has multiple multi-level power converters, a poly-phase interphase inductor, and a set of poly-phase power summing connections. The summed power of each of the multiple converter modules are connected together to form a single poly-phase power converter. | 09-29-2011 |
20120139354 | No Break Power Transfer for Power Generating System - A method for no break power transfer in a variable frequency power generating system, the power generating system comprising a first bus connected to a first generator and a second bus connected to a second generator includes configuring a power transfer device to output power that is synchronized to match a voltage and a frequency of the second bus to the second bus; reconfiguring the power transfer device to output power that is synchronized to match a voltage and a frequency of the first bus to the second bus; and closing a tie switch located between the first bus and the second bus. | 06-07-2012 |
20120300350 | GRADUALLY REDUCING RESISTIVE CLAMP - A voltage spike protection system minimizes a voltage spike by connecting a resistive clamp to a power source when the voltage spike is detected. The voltage spike detection system disconnects the resistive clamp after a portion of the voltage spike is dissipated. | 11-29-2012 |
20130027848 | COOLING AND CONTROLLING ELECTRONICS - A power electronics rack includes a switching chamber provided with one or more plate heat exchangers to receive a cooling fluid. A contactor chamber has contactors for connecting switches in the switching chamber to a magnetics chamber. The magnetics chamber receives at least one of a filter, an inductor or a transformer. The magnetics chamber receives cooling fluid which directly contacts the at least one of a filter, an inductor and a transformer for cooling. A common cooling circuit delivers cooling fluid to both the switching and magnetics chambers. The contactors may be reconfigured under certain conditions. | 01-31-2013 |
20130083574 | DUAL-INPUT NINE-PHASE AUTOTRANSFORMER FOR ELECTRIC AIRCRAFT AC-DC CONVERTER - A dual-input nine-phase autotransformer converts first and second three-phase AC inputs to a nine-phase AC output. The autotransformer includes input terminals for connection to a first three-phase AC input and a second three-phase AC input smaller than the first three-phase AC input. The autotransformer includes a first plurality of coils, a second plurality, and a third plurality of coils wound on respective phase legs of the autotransformer. The autotransformer includes a plurality of output terminals for providing a plurality of AC output voltages, and a plurality of internal terminals for connecting the first, second, and third plurality of coils in a configuration that provides a 40° phase shift in the AC outputs provided by the dual-input nine-phase autotransformer. | 04-04-2013 |
20130272040 | DUAL-INPUT 18-PULSE AUTOTRANSFORMER RECTIFIER UNIT FOR AN AIRCRAFT AC-DC CONVERTER - A dual-input 18-pulse autotransformer rectifier unit for more electric aircraft AC-DC converter uses an autotransformer with a nine-phase output to condition AC power prior to DC rectifying the AC power. | 10-17-2013 |
20140218065 | DETECTING EARLY FAILURES IN PRINTED WIRING BOARDS - A method includes characterizing the effects of an electric field on a first set of printed wiring boards (PWBs) by testing the first set of PWBs to generate test data, using the test data to determine a dielectric life curve of the first set of PWBs, and based on the dielectric life curve, defining a screening time and a screening voltage to screen for premature failures in a second set of PWBs due to electric fields. | 08-07-2014 |
20140292365 | ELECTRICAL CIRCUIT TESTING - An electronics system module includes a primary electrical circuit including input connectors and output connectors and a filter circuit connected between the primary electrical circuit and ground. The module also includes a switch element connected between the primary electrical circuit and ground. The switch element is configured to be engaged by a test connector to open the switch to disconnect the primary electrical circuit from ground. The test connector includes electrical connectors configured to connect to the input connectors and the output connectors of the primary electrical circuit. The switch element is configured to automatically close based on the test connector being disengaged from the switch element | 10-02-2014 |
20140300303 | SYSTEMS AND METHODS FOR ARC DETECTING AND EXTINGUISHING IN MOTORS - A system and method for arc detecting and extinguishing in motors includes a power input interface to a power source; an output interface to a motorized load to deliver power to the motorized load; a set of sensors configured to detect an arc condition in the motorized load; a set of switches switchable to provide a low-impedance pathway parallel to the arc condition in the motorized load; and a controller, coupled to the power input interface, the output interface, the set of sensors, and the set of switches, the controller being configured to switch the set of switches to disconnect the power source, and activate the low-impedance pathway based on the detection of the arc condition, thereby preventing unintentionally generated energy in the motorized load from sustaining the arc condition. | 10-09-2014 |