modular EV power LLC Back to Homepage
SAE J1772 Overview based on the NEW 2010 version of SAE J1772
I have been interested in public charging and the SAE J1772 standard which will define a standard connector and protocol for a long time.
The 2010 version of J1772 became available in the middle of 2010. SAE J1772 is a copyrighted standard published by SAE International.
The big changes were the new connector; minor changes to the pilot signal and eliminating the DC Charging options.
Typical operation would be:
· Plugs mate.
· +12 is sent out the control pilot pin by the charger.
· The vehicle limits this with a resistor and diode
· The charger starts the +12/-12 signal with the PWM signal indicating usable current.
· When the vehicle charger has set its current limit to that level or less, it adds a second resistor changing the control pilot voltage.
The voltage values determine if ventilation is required.
· The charger responds by supplying the power as long as the connection is maintained and ventilation can be complied with.
· The vehicle is to monitor the PWM for changes indicating different current availabilities.
· Removing the resistors or the PWM signal ends the charging.
Level 1 is 115 Volt power from a standard 5P-15 plug 6 to 16 amps.
Level 2 is 208 to 240 volts, 6-80 amps. The PWM specification now goes to 80 amps and there are places for special charging rates using external controls. The PWM pilot signal is backwards compatible to the 2001 version.
There are five pins in the new connector. One id ground and the other 2 large ones are the power contacts. One of smaller pins is the pilot signal described above that tells how much current is available and causes the charging Electric Vehicle Service Equipment, EVSE, to provide power. The other small pin is the proximity pin and is used by the vehicle side to determine if it is plugged in and if the latch is open or closed.
It appears that wireless communications, ZigBee, WiFi, or something like On Star will be used to transfer account information if charging is not free or V2G is applied.
Yazaki 30 Amp UL listed connector and cable set
REMA prototype Inlet Coupler Our Inlet Coupler based on the new SAE J1772:2010 standard
go to the J177:2001 old style connector page
© modular EV power LLC, all rights reserved, 2010
SAE J1772:2010(tm) is a trademarked standard of the Society of Automotive Engineers.