DC VOLTAGE CONVERTER & HIGH-VOLTAGE BOOSTER

SOLUTIONS FOR 800V ELECTRIC VEHICLES

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. Thanks to the integrated high-voltage booster from Preh, charging is also possible at any 400V fast charging station with up to 150kW power - for extra fast charging, anywhere. 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.

800 Volt technology from Preh

Technical article about high voltage boosting and DC/DC conversion in SAE International:

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Please to see this video.

Please to see this video.

Electric vehicles

High voltage
Battery management

Undervoltage and overvoltage, temperature fluctuations or different manufacturing tolerances can shorten the service life of battery cells in electric vehicles. This is why Preh's high-voltage battery management systems (BMS) constantly monitor the voltage and temperature of each individual battery cell. 

In addition, a high-precision current sensor designed according to the ASIL C standard achieves a measurement accuracy of 1.0 percent even after ten years with an initial calibration of 0.1 percent. For optimum battery performance and a longer service life, BMS compensates any differences in charge or temperature that occur.<br/> <br/> The remaining range can also be precisely determined. In addition to fundamental performance aspects, service life and remaining range for e-vehicles, Preh's systems also have a two-stage safety concept.

Hybrid vehicles

48V battery management system 

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.

Reliable, safe, modular

GENERIC on-board charger from Preh

Electric vehicle batteries are charged with direct current (DC).
Since only alternating current (AC) can be sourced from standard charging stations, wall boxes and household outlets, an OnBoard Charger (OBC) is required to convert the voltage to DC.
Preh supplies OBCs for various passenger cars, but also for trucks and buses.
These can be modified according to customer specifications or even expanded on a modular basis, e.g., the 11 kW OBC for commercial vehicles can be combined up to 44 kW.

Please to see this video.