The SAE J1772 Charging Adapter

This post gives a brief overview of the SAE J1772 Charging Adapter, a component of EV charging that allows EV owners to connect their vehicles to chargers and supply their batteries with power to travel.

Charging adapters connect the electric vehicle to a charging station in order to feed the battery with a direct current (DC). The charging station supplies an alternating current, which the on-board AC-DC converter turns into a direct current so that the battery can benefit from it. SAE J1772 charging adapters work with almost all Level 1 (120 volt) and Level 2 (240 volt) stations, and have recently been integrated to fit some DC Fast Charging stations. There is no federal law requiring a standardized Level 1 and Level 2 charging adapter, but most manufacturers of EVs have incorporated the J1772 adapter into their charging ecosystem.

The connector has five pins for AC Line 1, AC Line 2, Proximity Pilot, Control Pilot, and a Ground Pin.

This is the design layout of the Type 1 connector and its 5 pins, with the DC Fast charging implements below.

The connector is meant to withstand up to 10,000 connections and disconnections, which means a lifespan of 27 years assuming one connect-disconnect cycle per day, according to Electric Vehicles News.