Portable charging cable with in-line controller
A portable electric vehicle support equipment (EVSE) unit is formed as a cord of plural insulated conductors and a flexible outer sheath enclosing said plural insulated conductors. The cord includes an EVSE docking connector on a docking end of the cord and a utility plug on a utility end of the cord, said cord being divided into a docking section terminated at said docking connector and a utility section terminated at said utility connector. The cord further includes an in-line EVSE controller and a housing enclosing said controller, said housing sealed with said flexible outer sheath and disposed at an intermediate section of said cord between said docking and utility sections.
1. In an EVSE cord comprising a utility connector at one end, an EVSE docking connector at an opposite end, and an in-line EVSE controller coupled between said utility connector and said docking connector, a method of communicating digital data between said in-line controller and an external digital device, said method comprising:
coupling a serial port of a microprocessor of said in-line controller to a conductor of said cord that runs between said in-line controller and said docking connector; and
coupling a serial port of an external digital device to said conductor by connection to said docking connector.
2. The method of claim 1 wherein said external digital device comprises any one of a personal computer, a notebook computer, a cell phone, a personal digital assistant, or an interface tool dedicated to external connection with said docking connector.
3. The method of claim 1 further comprising:
downloading from said microprocessor to said digital device via said serial port an identification of firmware stored in said in-line controller;
determining whether said firmware has been superseded; and
uploading from said external digital device to said microprocessor via said serial port and via said conductor a current version of said firmware.
4. The method of claim 1 further comprising:
downloading, from said microprocessor to said external digital device, status data representative of conditions in or status of said EVSE cord; and
interpreting said status data and generating an image representing a meaning of said status data on a display of said digital device.
5. The method of claim 4 further comprising downloading said status data on a request-only basis.
6. The method of claim 4 further comprising downloading said status data as a constant stream.
7. The method of claim 1 further comprising:
downloading from said microprocessor via said serial port to an electric vehicle currently connected to said docking connector, digital device status data representative of conditions in or status of said EVSE cord; and
interpreting said status data and generating an image representing a meaning of said status data on a display of an electric vehicle.
8. The method of claim 1 further comprising:
sensing at a sensor in said in-line controller a utility voltage received through said utility connector;
determining which one of plural predetermined voltage ranges said utility voltage is closest to;
setting said one predetermined voltage range as the allowed voltage range; and
issuing a fault alarm whenever an output of said sensor indicates said utility voltage is outside said one predetermined range.
9. The method of claim 8 further comprising:
imposing a pulse signal on a control pilot conductor of said docking connector, wherein a duty cycle of said pulse signal is representative of a maximum current level; and
setting said duty cycle to a current level previously correlated to said one predetermined voltage range.