Karma Automotive LLC

L3harris Technologies, Inc.

Lixin Tang

Geng Niu

Xiaohang Yu

Uzzal Islam

Harshith Kulai

Alexander N Smith

Michael Kelleghan

In an embodiment, voltage fault detection is performed for alternating current (AC) multi-phase power systems based on a reconstructed or virtual voltage signal derived from voltage samples captured in a shortened sample window to reduce fault detection time. The embodiment of the present disclosure constructs the virtual voltage signal (emulating the root mean square (RMS) voltage of any of the phases) from the voltage samples captured from signals of the multi-phase power system. The embodiment of the present disclosure employs a shortened sample window of T/2/N (N is the number of phases ≥3) to capture the voltage samples, thereby reducing measurement and fault detection delay. The virtual voltage signal is used determine root mean square (RMS) voltage for voltage fault detection.

Multi-phase AC voltage fault detection based on virtual voltage

An apparatus comprising: a first circuit and a second circuit of a circuit configured to operate in a first mode and a second mode in which the first circuit dissipates more power than the second circuit and the second circuit dissipates more power than the first circuit, respectively; a coolant conduit with a first port and a second port and along which the first circuit and the second circuit are located nearer the first port and the second port, respectively; and a conduit switch network configured to deliver colder coolant to the first port or the second port, depending on which mode is active, such that the colder coolant flows through the coolant conduit and initially encounters whichever of the first circuit and the second circuit dissipates more power, then encounters whichever of the first circuit and the second circuit is not dissipating more power.

Reversible cooling apparatus for systems with variable heat distribution

An apparatus comprises: a first power source to generate first voltages; a power switch to supply the first voltages to a load as load voltages or not supply the first voltages to the load; first sensors to sense first sensed voltages based on the first voltages, and load sensors to sense the load voltages to produce sensed load voltages; and a controller to: upon detecting a failure of the first sensors, identify a faulty sensed voltage of the first sensed voltages caused by the failure based on at least the first sensed voltages and whether the power switch supplies or does not supply the first voltages to the load; compute a reconstructed sensed voltage to replace the faulty sensed voltage based on healthy sensed voltages of the first sensed voltages that are not faulty; and monitor the healthy sensed voltages and the reconstructed sensed voltage.

Fault-tolerant control for static transfer switch system

A method of applying three-phase power to a transformer having limbs including a first limb, a second limb, and a third limb respectively wound with primary windings that include a first winding, a second winding, and a third winding, includes: generating alternating current (AC) voltages (AC voltages) including a first AC voltage, a second AC voltage, and a third AC voltage; initially not applying the AC voltages to the primary windings; monitoring a relative voltage between the first AC voltage and the second AC voltage; and based on results of monitoring, implementing a power-on sequence of sequentially applying various ones of the AC voltages to corresponding ones of the primary windings until all of the AC voltages are applied to all of the primary windings in a manner that balances flux across the limbs during and after the power-on sequence.

Start sequence method and apparatus for three-phase transformers

An electrical drive system for a vehicle. The system includes a plurality of electric propulsion motors and a plurality of corresponding inverter circuits. The system also includes an auxiliary motor for driving an auxiliary device located in the vehicle. The auxiliary motor is connected to the propulsion motors and is driven by the inverter circuits. The system does not include a separate inverter for driving the auxiliary motor.

Electric motor drive system for a vehicle

The present disclosure relates to systems and configurations for phase-shift autotransformers and multi-pulse rectifiers. A phase-shift autotransformer includes a wiring configuration for first, second and third magnetic cores, the wiring configuration including primary input and phase-shift windings. The primary input windings are configured to provide a first and second primary input inductances, and phase-shift windings of the wiring configuration are configured to provide multiple inductances for each phase-shift winding. A multi-pulse rectifier is provided including a phase-shifting autotransformer, a diode bridge rectifier configuration coupled to output of the autotransformer and a filtering capacitor coupled to the diode bridge rectifier. Other embodiments are directed to use of the multi-use rectifier system with vehicle charging station, such as an Electric Vehicle Supply Equipment (EVSE).

Phase-shift autotransformer, multi-pulse rectifier systems and fast charging

An inverter assembly for an electric vehicle. The inverter assembly includes three inverters driving at least one wheel of the vehicle. Each inverter has a different phases angle relative to the other inverters in order to minimize current ripple and reduce the capacitor size to allow a smaller package for the inverter assembly.

Inverter system for an electric vehicle

A combined bi-directional converter and an auxiliary power module circuit for an 800V battery of an electric vehicle. The converter providing a stepped voltage of 400V with a duty ratio of 50 percent. The combined circuit comprises a high voltage side and a low voltage side. A transformer provides an interface between the high voltage side and the low voltage side. The combined circuit comprises a buck and boost mode.

Combined converter circuit

A switched reluctance motor for an electric vehicle. The switched reluctance motor includes an inverter with switchable windings to control the inductance of the motor. The motor also includes a high speed and low speed mode corresponding to the inductance of the motor. The inverter may include parallel switches, selectively running current to the windings in order to control the inductance.

Switched reluctance motor control

A segmented electrical drive system comprising a DC power bus comprising a DC voltage supply and a capacitor in parallel, an inverter comprising a plurality of inverter segments, a motor including a plurality of stator winding segments each connected to an inverter segment, and a controller. The controller receives a control signal and sends a switching signal to each of the inverter segments, wherein the switching signal is based on a discontinuous space vector pulse width modulation (DSVPWM) scheme for a segmented inverter. The DSVPWM scheme includes a set of reverse sawtooth carrier signals that are at an optimal phase shift angle with respect to each other.

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Irvine, CA, United States of America

Lixin Tang