Abstract: An open-loop fluxgate-type current sensor is described. The current sensor includes a single winding around a core that combines drive and sense that is used as both an excitation source and a feedback element to measure current through a primary winding. The current sensor further includes an H-bridge driver to impress voltage to the single winding to cause current to saturate the core, the voltage being impressed with opposing polarities repeatedly causing the core to saturate at opposing polarities. The current sensor further includes an analog transconductance integrator that continuously integrates the current to infer magnetizing force being driven into the core at the opposing polarities. The current sensor further includes a microcontroller unit (MCU) that calculates residual current based on the inferred magnetizing force being driven into the core at the opposing polarities and cause remedial action to be taken when the calculated residual current exceeds a threshold.

Abstract: Dynamic allocation of power modules for charging electric vehicles is described herein. The charging system includes multiple dispensers that each include one or more power modules that can supply power to any one of the dispensers at a time. A dispenser includes a first power bus that is switchably connected to one or more local power modules and switchably connected to one or more power modules located remotely in another dispenser. The one or more local power modules are switchably connected to a second power bus in the other dispenser. The dispenser includes a control unit that is to cause the local power modules and the remote power modules to switchably connect and disconnect from the first power bus to dynamically allocate the power modules between the dispenser and the other dispenser.

Abstract: An integrated meter in an electric vehicle supply equipment (EVSE) is described. Input power is received at input terminal of the EVSE and carried through a conductor that passes through an opening of a current transformer coil of the meter. The input power is split into a main path and an auxiliary path. The main path is for charging an electric vehicle (EV). The auxiliary path provides power to the meter to the EVSE itself. The auxiliary path passes through the opening of the current transformation coil in a reverse direction before being passed to a power supply of the meter and to a power supply of the EVSE to remove any current not for charging the EV from current measurements. The meter calculates energy measurements that do not include current drawn by the meter and the EVSE and transmits them to a processor of the EVSE.

Abstract: Dynamic allocation of power modules for charging electric vehicles is described herein. A power cabinet includes multiple power modules that each are capable of supplying an amount of power to a dispenser. Multiple dispensers are coupled with the same power cabinet. A first power bus couples a first dispenser and switchably connects the power modules to the first dispenser; and a second power bus couples a second dispenser and switchably connects the power modules to the second dispenser. The power cabinet includes a control unit that is configured to cause the power modules to switchably connect and disconnect from the first power bus and the second power bus to dynamically allocate the power modules between the first dispenser and the second dispenser.

Abstract: Networked electric vehicle charging stations for charging electric vehicles are coupled with an electric vehicle charging station network server that performs authorization for charging session requests while the communication connection between the charging stations and the server are operating correctly. When the communication connection is not operating correctly, the networked electric vehicle charging stations enter into a local authorization mode to perform a local authorization process for incoming charging session requests.

Abstract: Automatically identifying an electric vehicle supply equipment (EVSE) is described. A receiver device receives wireless signals from EVSEs, where each wireless signal includes an identifier that is associated with the one of the EVSEs from which that wireless signal is received. The receiver device records signal strength values of the wireless signals and determines, based on the recorded signal strength values, which of the EVSEs is closest to the receiver device. The receiver device initiates a request for an action at the EVSE determined to be closest to the receiver device.

Abstract: An electric vehicle supply equipment (EVSE) includes a thermal management system that includes a dual-sided heatsink that includes a first side that faces internal ambient air of the EVSE and a second side that faces external ambient air. A first fan circulates the internal ambient air of the EVSE across the first side to reject heat from the internal ambient air into the first side. A first airflow guide guides the internal ambient air across the first side of the dual-sided heatsink. A second fan draws external ambient air that flows across the second side to reject heat from the second side out of the thermal management system. A second airflow guide guides the external ambient air across the second side. An airflow seal prevents the external ambient air and the internal ambient air from mixing.

Abstract: An electric vehicle charging station that uses a liquid cooled charging cable is described. The charging station includes a charging port that is configured to connect to a liquid cooled charging cable. The liquid cooled charging cable includes a cooling loop where a return side of the cooling loop is a warm side. The charging station includes a heat exchanger that transfers heat from the warm side of the cooling loop. The charging station includes a pump to pump a cool side of the liquid through the cooling loop. The charging station includes a module that causes the following to be performed in response to a startup sequence of the electric vehicle charging station: iteratively perform operations of operating the pump at increasing speeds and measuring corresponding pressure output until the speed of the pump is at its normal capacity.

Abstract: An electric vehicle supply equipment (EVSE) receives, from an electric vehicle (EV) connected to the EVSE, one or more electric vehicle (EV) operator-specific parameters that are specific to an EV operator, where the one or more EV operator-specific parameters affect charging service for the EV at the EVSE, and where the one or more EV operator-specific parameters are received automatically as a result of the EV being connected to the EVSE. The EVSE applies the one or more EV operator-specific parameters.