BAE Systems Controls Inc.

A laminated DC busbar, a DC backplane and a DC busbar system with super low inductance is provided. Semiconductor switches may be connected to respective laminated DC busbars. The DC busbar system comprises a DC backplane and at least two laminated DC busbars respectively connected to semiconductor switches. The round-trip inductance between semiconductor switches connected to two adjacent laminated DC busbars via the DC backplane is less than about 7.5 nH

A cabling system having a shielded cable for connecting an inverter and an electric machine is provided. The conductive shielding is connectable, either directly or indirectly, to the chassis of the inverter and the chassis of the electric machine such as indirectly, via a cable connector chassis. The cabling system further comprise high pass filter which comprises capacitance electrically connected to the conductive shielding configured to attenuated current less than a predetermined frequency from coupling to the conductive shielding. The attenuation is achieved via a frequency dependent current limiting impedance of the capacitance. The current less than the predetermined frequency is caused by torque producing current and/or flux modifying current. The cable connector chassis may comprise at least one high pass filter to connect serially with at least one cable inserted therein, respectively.

A laminated DC busbar, a DC backplane and a DC busbar system with super low inductance is provided. Semiconductor switches may be connected to respective laminated DC busbars. The DC busbar system comprises a DC backplane and at least two laminated DC busbars respectively connected to semiconductor switches. The round-trip inductance between semiconductor switches connected to two adjacent laminated DC busbars via the DC backplane is less than about 7.5 nH.

A portable energy charging system and method for remote, isolated, and mobile energy charging for aerospace or aircraft vehicles which cannot be coupled to stationary (transmissions lines based) vehicle charge systems. The aircraft charging method includes connecting a portable energy source to an energy storage system in the aircraft vehicle and transferring an amount of energy from the portable energy source to the energy storage system in the aircraft. The charging system monitors, using one or more sensor devices, one or more charge condition parameters associated with the charging conditions at said energy storage system of the aircraft vehicle when receiving energy transferred from said portable energy source and detects any condition when a monitored parameter is a value exceeding a threshold level value. In response to detecting a condition when a monitored parameter is of a value exceeding a threshold level value, the charging system responsively initiates a correction.

Methods and systems for arc detection are described. A controller can receive a bus voltage of a direct current (DC) bus connected to an energy source. The controller can determine whether the received bus voltage is less than a bus voltage threshold. The controller can, in response to determining the received bus voltage being less than the bus voltage threshold, determine an occurrence of an arc event in an apparatus that includes the DC bus and the energy source.

A distributed control system includes an electronic control unit to establish secure communication with a distributed control module. Upon determination that a previously negotiated session key is stored on the electronic control unit, the electronic control unit transmits encrypted communications with the distributed control module using the previously negotiated session key, negotiates a new session key with the distributed control module, and stores the new session key. Upon determination that the previously negotiated session key is not stored on the electronic control unit, the electronic control unit negotiates the new session key with the distributed control module. After negotiating the new session key with the distributed control module, the electronic control unit ceases transmission of unencrypted communications with the distributed control module, transmits encrypted communications with the distributed control module using the new session key, and stores the new session key.

Charging apparatus and systems are provide for charging an energy storage system in respective vehicles using grid power where the vehicles are connected to the same transformer. The apparatus and system coordinate the charging and may use field weakening techniques to reduce a peak line-line voltage when a need is determined based on a minimum energy storage system voltage of the vehicles connected to the same transformer.

An AC busbar for connecting at least three phases from a semiconductor switching unit to a load is provided. The AC busbar parallelly connects the at least three phases and provides current balancing. The AC busbar has a terminal-side conductor mechanically connectable to each AC terminal of the semiconductor switching unit and a load-side conductor positioned between the terminal-side conductor and the load. A distance between the terminal-side conductor and the load-side conductor is such that a difference in an inductance between a connection point for a respective AC terminal of each phase and a common point on a middle of the load-side conductor is less than a predetermined percentage with respect to an average of the respective inductances.

Apparatuses and techniques for reducing backlash between components in a transmission system are provided. The apparatuses and techniques provide a controllable torque over a target range of motion of a component in the transmission system. This eliminates the play at the interfaces between components and forces the components to maintain a controlled contact between the interfacing surfaces.

A distributed control system includes an electronic control unit to establish secure communication with a distributed control module. Upon determination that a previously negotiated session key is stored on the electronic control unit, the electronic control unit transmits encrypted communications with the distributed control module using the previously negotiated session key, negotiates a new session key with the distributed control module, and stores the new session key. Upon determination that the previously negotiated session key is not stored on the electronic control unit, the electronic control unit negotiates the new session key with the distributed control module. After negotiating the new session key with the distributed control module, the electronic control unit ceases transmission of unencrypted communications with the distributed control module, transmits encrypted communications with the distributed control module using the new session key, and stores the new session key.