Patent application number | Description | Published |
20130278229 | THERMAL STRESS REDUCTION IN AIRCRAFT MOTOR CONTROLLERS - A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode. | 10-24-2013 |
20140250910 | THERMAL STRESS REDUCTION IN AIRCRAFT MOTOR CONTROLLERS - A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode. | 09-11-2014 |
20140253005 | THERMAL STRESS REDUCTION IN AIRCRAFT MOTOR CONTROLLERS - A thermal stress reduction method includes ramping an electric power generator to start an aircraft engine, for a time period associated with the aircraft engine start sequence toggling a three-level inverter switch array to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode. | 09-11-2014 |
20140306452 | INTERLEAVED MOTOR CONTROLLERS FOR AN ELECTRIC TAXI SYSTEM - Embodiments of the disclosure include an electric taxi system including a generator configured to provide an AC power source and a main controller configured to generate one or more PWM control signals. The electric taxi system also includes a plurality of motor controllers connected in parallel to the generator, wherein each of the plurality of motor controllers receives one of the one or more PWM control signals. The electric taxi system further includes a plurality of motors, wherein each of the plurality of motors are coupled to one of the plurality of motor controllers. | 10-16-2014 |
20150042437 | BOBBINS FOR GAPPED TOROID INDUCTORS - A bobbin for spacing windings around an inductor core includes an interior spacer defining an exterior surface for coupling interior spacer with an annular inductor core and an interior facing surface opposing the exterior surface for receiving inductor windings. The interior spacer has a thickness profile between the exterior and interior facing surfaces for spacing the windings inward from the inductor core to reduce magnetic fringe flux effects on the windings. An inductor body includes an inductor core coupled to bobbin. A wound inductor includes windings wrapped around the inductor body formed by the inductor core and bobbin. | 02-12-2015 |
20150343911 | POWER CONVERTERS - A power converter includes a first set of transistors electrically connected in series, a second set of transistors electrically connected in series, and an AC link. The second set of transistors is electrically connected in parallel with the first set of transistors to form an H-bridge. The AC link is electrically connected between the first and second sets of transistors. A plurality of H-bridges are connected in parallel and a three-wire DC bus is electrically connected to the H-bridges. | 12-03-2015 |
20150349660 | SOLID-STATE INVERTERS WITH VOLTAGE-BALANCED SWITCHES - A phase leg for a multilevel inverter includes a positive DC lead, a first outer MOSFET connected to the positive DC lead, a first inner IGBT connected to the first outer MOSFET, a second inner IGBT connected to the first inner IGBT, and a second outer IGBT connected to the second inner IGBT. The first and second outer MOSFETs are superjunction MOSFETs voltage balanced by the first and second IGBTs for reducing voltage stress in the solid-state switch phase leg when the superjunction MOSFET and the IGBT are conducting current from the DC lead to the AC lead. | 12-03-2015 |
20150357930 | SYSTEMS AND METHODS FOR CONTROLLING ACTIVE RECTIFIERS - A method of controlling a rectifier includes receiving a gain factor, receiving a ramp interval, and generating a rectifier switch control voltage. The rectifier switch control voltage is an over-modulated rectifier switch control voltage generated by a pulse width modulator using the gain factor. The amount of over-modulation in the rectifier switch control voltage is decreased during the ramp interval for reducing transient voltage overshoot events at the start of active rectification. | 12-10-2015 |