Abstract: A power switching circuit provides temperature compensation for an insulated gate power switching device. A timing circuit determines a switch timing signal comprising desired on and off switching times of the switching device. A temperature monitor quantifies a device temperature. A gate drive profile generator generates a switching device drive signal according to the switch timing signal and having a dv/dt phase and a di/dt phase. The drive signal has a profile during the di/dt phase that is adjusted in response to the device temperature, and the drive signal has a profile during the dv/dt phase that is not adjusted in response to the device temperature.

Abstract: A power switching circuit provides temperature compensation for an insulated gate power switching device. A timing circuit determines a switch timing signal comprising desired on and off switching times of the switching device. A temperature monitor quantifies a device temperature. A gate drive profile generator generates a switching device drive signal according to the switch timing signal and having a dv/dt phase and a di/dt phase. The drive signal has a profile during the di/dt phase that is adjusted in response to the device temperature, and the drive signal has a profile during the dv/dt phase that is not adjusted in response to the device temperature.

Abstract: A vehicle includes an electric machine that provides propulsive force to the vehicle, and a power inverter that supplies power from a traction battery to the electric machine using a first and second switch configured as a half-bridge. The first switch has a first gate, a first gate lead coupled with the first gate and having a first inductance, and a second gate lead coupled with the first gate and having a second inductance greater than the first inductance.

Abstract: Routing of a gate signal for controlling a discrete power switching device (such as in an inverter for an electric vehicle drive) is configured to compensate for the common source inductance inherent in the switching device as a result of its integrated circuit packaging. The power device has a gate signal path via a gate pin and a power signal path via first and second power pins, wherein the gate signal path and the power signal path have a first mutual inductance. A circuit board apparatus provides a gate wiring loop juxtaposed with the power signal path, wherein the gate wiring loop and the power signal path have a second mutual inductance substantially canceling the first mutual inductance. The resulting reduction in common source inductance avoids the reductions in switching speed and the increased switching losses otherwise introduced by the common source inductance.

Abstract: A vehicle powertrain includes an IGBT and a gate driver. The IGBT is configured to energize an electric machine. The gate driver is configured to apply an off voltage less than a threshold voltage onto a gate of the IGBT while the IGBT is operating in a saturation mode, and in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage to reduce flyback from the electric machine. The gate driver may be configured to, in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage and below the threshold to reduce flyback from the electric machine.

Abstract: A capacitor comprising first and second end sprays respectively located at distal ends of a capacitor cell, a positive polarity bus bar extending from a first wound conductive layer of the capacitor cell adjacent to the first end spray, a negative polarity bus bar extending from a second wound conductive layer of the capacitor cell adjacent to the second end spray, and a capacitor film wrapped around an area between the first and second conductive layers.

Abstract: A vehicle powertrain includes an electric machine, an inverter including an IGBT having a gate configured to flow current through a phase of the electric machine, and a gate driver. The gate driver is configured to supply power onto the gate via a voltage regulated source, and in response to a collector current of the IGBT exceeding a previous steady state current through the phase, transition to a current regulated source to drive the gate. The gate driver may be configured to delay the transition by a predetermined time that is based on a difference between the previous steady state current and a reverse recovery peak current.

Abstract: An inverter for an electric vehicle comprises a phase leg having series-connected upper and lower transistors between a positive bus and a ground bus. Upper and lower gate drive circuits supply gate drive signals to the upper and lower transistors. Each gate drive circuit includes an active clamp for deactivating the upper and lower transistors. The transistors are comprised of semiconductor devices, each having respective gate, collector, and emitter terminals. Each pair of gate and emitter terminals is adapted to provide an enhanced common source inductance therebetween. Each gate terminal is adapted to be tied to a ground voltage of the drive circuits. Each respective active clamp is comprised of a p-channel MOSFET having a source terminal connected to the gate terminal of a respective transistor and having a drain terminal connected to the emitter terminal of the respective transistor bypassing the respective enhanced common source inductance.

Abstract: A vehicle powertrain includes an IGBT and a gate driver. The IGBT is configured to energize an electric machine. The gate driver is configured to apply an off voltage less than a threshold voltage onto a gate of the IGBT while the IGBT is operating in a saturation mode, and in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage to reduce flyback from the electric machine. The gate driver may be configured to, in response to expiration of a delay from a transition from saturation to linear mode, apply a voltage pulse above the off voltage and below the threshold to reduce flyback from the electric machine.

Abstract: A vehicle powertrain includes an IGBT that conducts current between a supply and load. The vehicle powertrain also includes a controller that applies voltage to a gate of the IGBT at a first level for a first duration that depends on a capacitance of the gate, and increases the voltage over a second duration based on a rate of change of the current falling below a threshold defined by a supply voltage for the load.

Abstract: A vehicle includes an electric machine, an IGBT, and a gate driver. The IGBT has a gate, an emitter, and a collector and is configured to flow an electric charge through a phase of the electric machine. The gate driver is configured to flow current onto the gate at a first level, and in response to a time integral of a voltage across the phase exceeding a predetermined level, transition from the first level to a second level less than the first level.

Abstract: A differential voltage probe for providing accurate measurement of differential voltage with high frequency components is disclosed that is further configured to accurately identify noise sources in EMI/EMC applications. The differential voltage probe is configured to provide the benefits of adequate differential voltage measurement bandwidth, galvanic isolation capability, high CMRR, flexible design to accommodate various requirements on voltage rating, loading effect, and frequency range of interest; and/or easy implementation and low cost. The differential voltage probe is able to achieve these optimized capabilities by implementing unique winding designs for transformer(s) used in the differential voltage probe circuit design.