- Tech know how online

on-board charger (OBC)

On-board chargers (OBC) are charging devices used to charge the batteries ofelectric vehicles

. They are

installed in the vehicles, ensure


authentication of

the e-vehicle at the charging

station, convert the alternating current


the charging station into direct current, provide communication

between the vehicle and the charging station and take over the battery management.In accordance with the standards of the automotive industry, on-board chargers are housed in metallic enclosures. The connectors to the charging station and the battery are extremely robust. Functionally, an on-board charger consists of a rectifier, which converts the single-phase alternating

currentor three-phase three-phase

current coming from the charging station into direct current, and a DC/DCconverter

, which provides the correct charging voltage for the batteries.OBC units have different power classes depending on the mains voltage

and the three-phase three-phase current. Common power classes are 3.6 kW at 230 V AC and 16 A AC. With three-phase supply, the power values are 11 kW and 22 kW. The charging times for the car batteries can be calculated from these values.

On-Board Charger (OBC), photo:

On-Board Charger (OBC), photo:

Via the built-in battery management system, On-Board Chargers ensure that the batteries are charged quickly and in a way that is gentle on the batteries. As far as communication between the charging station and the on-board charger is concerned, the latter are equipped with standardized communication protocols according to IEC 61851 and ISO 15118. They exchange charging parameters and information on payment procedures via the corresponding protocols. Some OBC units are smart and can also take over the energy feed into smart grids, namely when the car batteries take over buffer functions of the power grid.

Informationen zum Artikel
Englisch: on-board charger - OBC
Updated at: 19.09.2020
#Words: 269