Patent application number | Description | Published |
20090008993 | Hybrid electromechanical power transfer system - An electromechanical power transfer system that transfers power between a prime mover and a combination of multiphase alternating current (AC) and direct current (DC) electrical power systems, comprises: a dynamoelectric machine that has a rotor assembly coupled to the prime mover, a main stator with a multiphase alternating current (AC) winding coupled to a main stator bus and a control coil with a winding that varies the output of the main stator with the application of control coil current; a matrix converter coupled to the main stator bus for converting AC on the main stator bus to AC of a desired electrical frequency and potential on an AC system bus; an active rectifier coupled to the main stator bus for converting AC on the main stator bus to DC of a desired potential on a DC bus; and a system control unit for generating the control coil current with a level that regulates the output of the main stator on the main stator bus, controlling the output of the matrix converter to regulate the output of the AC system bus and controlling the output of the active rectifier to regulate the output of the DC bus. | 01-08-2009 |
20090016089 | Electromechanical power transfer system with even phase number dynamoelectric machine and three level inverter - An electromechanical power transfer system that converts direct current (DC) electrical power to variable mechanical power, comprises: a source of DC that has a neutral ground, a positive potential output with a level of electrical potential that is positive relative to the neutral ground and a negative potential output with a level of electrical potential that is negative relative to the neutral ground; a multiphase alternating current (AC) dynamoelectric machine with an even number of phases; and a neutral point clamped (NPC) inverter system that receives electrical power from the positive and negative potential outputs the DC source to generate multiphase AC power for the dynamoelectric machine with the same number of even phases that exhibits no common mode potential/noise. | 01-15-2009 |
20090284997 | METHOD TO CREATE PWM SWITCHING WITH NEAR ZERO COMMON MODE NOISE - A method for controlling a three-level inverter with a two-level inverter controller uses a conversion circuit to process the two-level control signals and output a set of three-level control signals. | 11-19-2009 |
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 |
20100283415 | Motor Drive System with Flux Regulated PM Generator - A method of generating and controlling power for an alternating current (AC) motor by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a variable low frequency alternating current (AC) motor control output for the motor; sensing desired motor control parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the motor control output. | 11-11-2010 |
20100284208 | POWER-CONVERSION CONTROL SYSTEM INCLUDING SLIDING MODE CONTROLLER AND CYCLOCONVERTER - A power-conversion control system includes an inverter, a cycloconverter, and a sliding mode controller. The inverter is operable to receive a DC voltage input and produce a first AC voltage output having a first frequency. The cycloconverter has a plurality of bidirectional switches, and is operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency. The sliding mode controller is operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition. The sliding mode controller is also operable to selectively adjust the frequency and amplitude of the second AC voltage. | 11-11-2010 |
20100295517 | POWER GENERATING SYSTEM WITH FLUX REGULATED GENERATOR - A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output. | 11-25-2010 |
20110121769 | MULTI-TASKING POWER PROCESSOR FOR A VEHICLE ELECTRIC SYSTEM - A multi-tasking power processor ( | 05-26-2011 |
20110221404 | SSPC WITH ACTIVE CURRENT LIMITING - A power distribution module has an input line to receive power from a DC power source. A switch selectively opens the input line and blocks supply of power from the input line to an output line to be connected to a DC load. A solid state power control controls a gate drive for the switch. The solid state power control is operable to distinguish between a pre-charge mode, at which current is rushing to supply a capacitor in the downstream DC load, and a short circuit mode, at which a short circuit exists. | 09-15-2011 |
20110227406 | CONTROL METHOD FOR ELECTRICAL ACCUMULATOR UNIT - A power generation system has a generator, a power converter, a power bus and an electrical accumulator. The electrical accumulator stores power when the generator generates excess power and supplements power from the generator when the generator generates insufficient power. | 09-22-2011 |
20110286141 | SSPC for Soft Start of DC Link Capacitor - A solid state power controller (SSPC) for soft start of a direct current (DC) link capacitor of a DC power distribution system includes a power input connected to a DC power source of the DC power distribution system; a plurality of power switches arranged in parallel, the plurality of power switches being connected to a power output of the SSPC, the power output being connected to the DC link capacitor; and an SSPC controller configured to: pulse width modulate the plurality of power switches with a phase-shifted sequence in a current limiting mode; determine whether soft start is complete; and in response to determining that the soft start is complete, turn on the plurality of switches at a maximum gate-source voltage. | 11-24-2011 |
20110304942 | SSPC With Dual Fault Detectors - A solid state power controller (SSPC) for a direct current (DC) electrical system includes a high bandwidth fault detector, the high bandwidth fault detector configured to detect a possible fault and place a power switch of the SSPC in saturation at a predetermined current limit; and a low bandwidth fault detector, the low bandwidth fault detector configured to determine whether the possible fault is a confirmed fault, and in the event the possible fault is determined to be the confirmed fault, turning off the power switch, or in the event the possible fault is determined not to be the confirmed fault, turning on the power switch at a minimum on-resistance. | 12-15-2011 |
20120043815 | ACTIVE FILTERING ELECTRICAL ACCUMULATOR UNIT - A power generation system has a generator, a power bus and an electrical accumulator unit. The electrical accumulator unit includes an independent controller that actively filters transients from the power bus. | 02-23-2012 |
20120043822 | MODULAR ELECTRICAL ACCUMULATOR UNIT - A modular electrical accumulator unit includes multiple electrical accumulator unit modules, which are operated in conjunction with each other to form a single electrical accumulator unit. | 02-23-2012 |
20120043938 | METHOD FOR CONTROLLING AN ELECTRIC ACCUMULATOR UNIT - A power system has a generator, a variable load, and an electrical accumulator unit. The electrical accumulator unit stores power when the generator generates excess power, and supplements power from the generator when the generator generates insufficient power. | 02-23-2012 |
20120043944 | METHOD AND APPARATUS FOR AVERAGE CURRENT CONTROL - A method and apparatus for controlling a converter circuit within the electrical accumulator unit based on a comparison between an actual average converter current and a desired average converter current. | 02-23-2012 |
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 |
20130021712 | OVERVOLTAGE PROTECTION METHOD AND DEVICE - An example, overvoltage protection device includes a switch and a surge protection device that is selectively activated by actuating the switch. The switch is actuated in response to a voltage. An example method of absorbing an overvoltage includes sensing a voltage, and selectively activating a surge protection device in response to the sensed voltage. | 01-24-2013 |
20130279216 | COMPENSATING RIPPLE ON PULSE WITH MODULATOR OUTPUTS - A ripple compensation apparatus comprises a ripple detection unit to detect a ripple on a dual DC bus, a waveform generation unit to generate a modulated waveform based on a base waveform and the detected ripple, and a multi-phase control signal generation unit to receive the modulated waveform and to generate at least one pulse width modulated control signal based on the modulated waveform. | 10-24-2013 |
20140103650 | DUAL-DC BUS STARTER/GENERATOR - A system includes a starter/generator that receives AC power in a start mode, and generates AC power in a generate mode; and an inverter/converter circuit that converts the generated AC power from the starter/generator to DC power for a dual-DC bus during the generate mode, and converts DC power to AC power for the starter/generator during the start mode, wherein the inverter/converter circuit denies power flow from the dual-DC bus to the starter/generator during the generate mode. | 04-17-2014 |
20140104900 | SYSTEM AND METHOD FOR CONNECTING THE MIDPOINT OF A DUAL-DC BUS TO GROUND - A system includes a power source that provides alternating current (AC) power and is connected to system ground; a dual-DC bus that provides direct current (DC) power to a load, and comprises a positive line, a negative line, and a midpoint line; an active rectifier that converts AC power from the power source to DC power for the dual-DC bus; and an impedance circuit connected between the midpoint of the dual-DC bus and the system ground that provides impedance for third harmonic common-mode current. | 04-17-2014 |
20140104901 | EMI FILTERING FOR ACTIVE RECTIFIER POWER SYSTEMS - A system for filtering electromagnetic interference (EMI) includes a power source that provides alternating current (AC) power; a load; an active rectifier that converts AC power from the power source to direct current (DC) power for the load; and a filter connected between the power source and the active rectifier, wherein the filter comprises at least one notch filter that filters selected frequencies of EMI generated by the active rectifier. | 04-17-2014 |
20140334208 | SYNCHRONOUS RECTIFICATION IN THE THREE-LEVEL INVERTER-CONVERTER TOPOLOGIES - A power module for a three-level power inverter/converter that employs synchronous rectification for use in a uni-directional active rectifier mode to reduce static losses and enhance efficiency across the circuit. Each synchronous rectifier can be a silicon carbide (SiC) power MOSFET connected in parallel with a SiC power diode, for example. | 11-13-2014 |
20140369092 | METHOD OF REDUCING INPUT CURRENT DISTORTION IN A RECTIFIER - A method is disclosed for reducing input current harmonic distortion in a Vienna-type active rectifier that includes the steps of sensing voltage values from upper and lower halves of a DC bus associated with the rectifier, determining an average of the sensed voltage values, calculating upper and lower scale factors by dividing the sensed voltage values with the averaged sensed voltage value, rescaling a reference signal from a controller using the upper and lower calculated scale factors, and forward feeding the rescaled reference signal from the controller to a pulse width modulator to obtain a gate driver signal for power semiconductor switches of the rectifier. | 12-18-2014 |
20140369101 | METHOD OF DERIVING SWITCH CURRENT SIGNALS IN A RECTIFIER - A method of deriving synchronous switch currents for a three-phase Vienna-type active rectifier that includes the step of generating gate driver signals for each phase of the rectifier by pulse width modulation, wherein the gate driver signals include a top gate driver signal, a clamp gate driver signal and a bottom gate driver signal, and the step of deriving synchronous switch current signals from the gate driver signal, wherein the synchronous switch current signals include a top gate switch current signal, a clamp gate switch current signal and a bottom gate switch current signal. | 12-18-2014 |