Gm Global Technolgoy Operations, Inc.

Samantha Gunter Miller

Douglas S Cesiel

Chandra S Namuduri

Lei Hao

Chengwu Duan

A vehicle system includes a power inverter coupled to an AC bus having a neutral conductor, a switching device coupled between the neutral conductor and a ground conductor, a sensor configured to measure an impedance between the neutral and ground conductors, and a control module. The power inverter is configured to provide AC power to an output via the AC bus. The control module is configured to transmit a signal to open the switching device to create a floating neutral configuration between the power inverter and the output, receive a signal from the sensor indicative of the impedance, and in response to the impedance between the neutral conductor and the ground conductor being less than or equal to a threshold, transmit a signal to the power inverter to provide AC power to the output. Other example vehicle systems and control methods are also disclosed.

On-board vehicle inverter with selectable neutral bonding

A system for charging an electric vehicle in a facility includes a current sensor adapted to obtain an input current signal for a power source in the facility. An electric vehicle supply equipment (EVSE) is configured to charge the electric vehicle through the power source based at least partially on a control pilot signal. A controller has a processor and tangible, non-transitory memory on which instructions are recorded for dynamically adjusting the control pilot signal based on the input current signal. The control pilot signal is set to a predefined maximum when the input current signal is less than a main circuit breaker rating of the facility. The controller is configured to reduce the control pilot signal from the predefined maximum when the input current signal is at or above the main circuit breaker rating.

Dynamic load management for electric vehicle charging

An electrical system can include a rechargeable energy storage system (RESS) and a direct current to direct current (DC-DC) converter. The DC-DC converter is connected to the RESS and configured to connect to a DC charging station. The DC-DC converter is configured to selectively connect the RESS to the DC charging station such that a charging current is selectively provided to the RESS during a recharging operation.

Controlling a DC-DC converter for DC charging

A split-phase bidirectional on-board charger (OBC) has separate charging and discharging modes, and includes a switchgear block connectable to an offboard charging station during the charging mode, and to an external alternating current (AC) load during the discharging mode. The OBC includes first and second DC-AC converters connected to the switchgear block and DC-DC converter connected to the first and second DC-AC converters and a DC bus. During the charging mode, the DC-AC converters output a DC link voltage to the DC-DC converter. The DC-DC converter outputs a DC charging voltage or current to the DC bus when the link voltage reaches a predetermined value. During the discharging mode, the DC-AC converters receive a DC discharging voltage or current from the DC-DC converter and together selectively output a split-phase AC voltage through the switchgear block to the AC electrical load.

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Berkley, MI, United States of America

Samantha Gunter Miller