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Patent US10252627
Issued 2019-04-09
On Board Charger Input Current Limit Setting Based On Ac Input Circuit Voltage Response
This disclosure relates to the field of electric vehicles (EV) that run, at least in part, on an electric motor. Included on the EV is an on board charger (OBC) responsible for charging a battery supply based on electronic power received from a source. The OBC is configured to detect certain voltage or current characteristics during a charging operation of the battery supply, and adjust allowed operational limits for the OBC accordingly.
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- 1. An electric vehicle charging system comprising:
an interface configured to:
receive power from an electric vehicle charging station;
a power convertor configured to convert the power to a battery chargeable power supply; and a controller in communication with the interface and the power convertor, wherein the controller is configured to:
supply the battery chargeable power supply to a battery;
monitor the power received from the electric vehicle charging station;
determine whether a change in voltage of the power received from the electric vehicle charging station is greater than a predetermined voltage change limit;
when the change in voltage is determined to be greater than the predetermined voltage change limit, adjust a maximum current limit to a predetermined lower current limit value;
control a current within the electric vehicle charging system to be below the predetermined lower current limit value;
determine whether a current from the power received from the electric vehicle charging station is greater than the maximum current limit;
when the current of the power is determined to be greater than the maximum current limit, adjust the current limit to a predetermined lower current limit value; and
control the current within the electric vehicle charging system to be below the predetermined lower current limit value.
- 10. An electric vehicle charging method comprising:
receiving, through an interface, power from an electric vehicle charging station; supplying the power to a battery; monitoring, by a controller, the power received from the electric vehicle charging station; determining, by the controller, whether a change in voltage of the power received from the electric vehicle charging station is greater than a predetermined voltage change limit; when the change in voltage is determined to be greater than the predetermined voltage change limit, adjusting, by the controller, a maximum current limit to a predetermined lower current limit value; controlling, by the controller, a current within an on board charger to be below the predetermined lower current limit value; determining whether a current from the power received from the electric vehicle charging station is greater than the maximum current limit; when the current of the power is determined to be greater than the maximum current limit, adjusting the current limit to a predetermined lower current limit value; and controlling the current within the on board charger to be below the predetermined lower current limit value.
