The first electric vehicles with an 800V battery have been on sale since the end of 2019.
These high-performance units make e-vehicles particularly fast - even when charging.
Charging for 20 minutes at an 800V High Power Charge station, around 80 percent of the battery is recharged again. However, there is no need for charging anxiety at 400V fast-charging stations, as the integrated high-voltage booster from Preh also enables charging there with up to 150kW of power.
This 800V not only results in high performance and short charging times, but with the Preh DC voltage converter, three lower voltages can also be generated, which supply important vehicle components. Strictly speaking, it is a multi-converter that transforms the 800V into three voltages: into 400V (for the air conditioning compressor) as well as into a bidirectional 48V voltage (for chassis roll stabilization) and into 12V for the on-board power supply. The 48V voltage is used to supply the roll stabilization of the vehicle and works bidirectionally. The voltage can be converted back from 48V to 800V due to recuperation.
DC/DC CONVERTER, PORSCHE TAYCAN
BOOSTER, PORSCHE TAYCAN
3.6 KW GENERIC ON-BOARD CHARGER
48V BATTERY MANAGEMENT
CONTROL UNIT, MERCEDES-BENZ, VARIOUS MODELS
3.6 KW ON-BOARD CHARGER, VOLVO, LYNK & CO, VARIOUS MODELS
11 KW ON-BOARD CHARGER, VOLVO TRUCKS AND BUSES, VARIOUS MODELS
Technical article about high voltage boosting and DC/DC conversion in SAE International:
Preh battery management expertise can also be found in hybrid vehicles. On the basis of many years of experience in developing and manufacturing battery management systems (BMS) for e-vehicles, similar advantages can also be used for hybrid vehicles with a 48V BMS battery management system. Battery cells' voltage and temperature are continuously monitored and, if there are deviations, balanced accordingly. This makes for a longer lifespan and optimal battery cell performance. This technology is used in series production in various four- and six-cylinder models at Mercedes-Benz.
The battery of every electric car can only be charged with direct current (DC). Although the global infrastructure is increasingly being expanded to include DC fast-charging stations, it is far behind the number of alternating current (AC) stations.
In a normal household there is always an alternating current (AC). The advantage here is that the voltage can be adjusted more favorably and with less loss than is the case with direct current (DC). This is useful for household appliances, for example, but is of no use at all in electric cars. This is because their batteries require a charge with a constant current and a constant direction. Without direct current, no electric car will charge.
Now the photovoltaic system on the roof, and therefore the wallbox in the garage, also supplies AC. To make AC charging possible, an on-board charger is required to convert the alternating current into direct current. “On board” means that the current transformer is installed in the vehicle.
Preh supplies on board chargers for various vehicles, but also for trucks and buses.
These can be modified or modularly expanded according to customer specifications, e.g. the 11 kW OBC for commercial vehicles can be combined for up to 44 kW.
Bidirectional applications are also possible for V2G (vehicle to grid) and V2L (vehicle to load).
