I am aware of many ways a load can be controlled in terms of its current demand, however, does any know how EV charging demand is controlled. If I understood that many EVs have a 3.6KW or 7KW setting but nothing onboard that would adjust current demand. How is close control likely to be effected?
This standard specifies the protocol used by Mode 3 and Mode 4 chargers to communicate with the vehicle - although for Mode 4 chargers, the basic functions are extended as discussed in BS EN 61851-23 and BS EN 61851-24. Some functions are optional for both vehicle and charging point. Some charge points are indeed set up to deliver only one or more fixed power levels, others have more fine control available. Because the control is digital, even in the most advanced chargers, the steps are discrete.
In the most basic systems (where there is no CAN bus or similar comms) the pilot's pulse width communicates the amount of power available for charging.
The vehicle will determine whether or not it draws current if the charging point (EVSE) can't deliver enough power - with many vehicles on the market, the threshold of temporarily curtailing charging is often around 10 A.
This standard specifies the protocol used by Mode 3 and Mode 4 chargers to communicate with the vehicle - although for Mode 4 chargers, the basic functions are extended as discussed in BS EN 61851-23 and BS EN 61851-24. Some functions are optional for both vehicle and charging point. Some charge points are indeed set up to deliver only one or more fixed power levels, others have more fine control available. Because the control is digital, even in the most advanced chargers, the steps are discrete.
In the most basic systems (where there is no CAN bus or similar comms) the pilot's pulse width communicates the amount of power available for charging.
The vehicle will determine whether or not it draws current if the charging point (EVSE) can't deliver enough power - with many vehicles on the market, the threshold of temporarily curtailing charging is often around 10 A.
