Dual voltage power supply system with 48 volts (BMW presentation)

As convened, here is a snapshot of Ottmar Sirch's presentation on 48 volt. This paper is scheduled during CESA 2012.
As an introduction, our expert from BMW reminds that the continuous increase of functionality for comfort, safety, driver assistance and infotainment systems as well as the insertion of innovations raise the requirements. In combination with the electrification of powertrain functions and ancillary units for CO2 reductions these requirements drive today´s vehicle power supply to its limits.

Then, Mr Sirch gives examples : Start-Stop-Function, Brake Energy Recuperation und electrification of mechanical driven systems as well as superpositioning of high power loads. The demand of electric energy and power as well as the cycling of accumulators have increased significantly.

In the future, OEMS will need High Power Recuperation (> 5 kW), Extended Start-Stop-Functions, E-Assist/E-Boost, eTurboCharge, as well as Electrification of ancillary units (electric climate compressor, electrification of chassis control systems) and new functions (front screen heating, electrohydraulic valve control)

As a conclusion, displacing all high power loads and implementation of new high power functions can reduce the requirements to the DC/DC converter and the 12-V-battery significantly.

Ottmar Sirch (BMW) to discuss 48 volt at CESA 2012

CESA speaker

Top expert from BMW, Ottmar Sirch will make a presentation on 48 volt in Paris, during CESA 2012. He's focusing on dual voltage as the responsible for the Predevelopment of Vehicle Electrical Power Supply Systems.
In Munich, the predevelopment projects cover all subjects of electrical power supply in vehicles with combustion engines as well as Hybrid and Electric vehicles.
Mr Sirch came to SIA office in Suresnes, near Paris to share his vision for 48 v, a few days ago.

The presentation has been attended by Gérard Maniez (Freescale), Guy Convenant (Valeo), Uwe Dausch (Valeo), Jean-Yves Stineau (Renault), Oliver Nass (ESG Group), Daniel Benchetrite (Valeo), Gérard Saint-Léger (Renault), Dominique Lenoir (Renault), Franck Briault (PSA Peugeot Citroën), Eric Dequi (PSA Peugeot Citroën), Thierry Seynaeve (ESG Group) and Jean-François Léon (Valeo).

Who is Ottmar Sirch ? 
Since 11 years, he is Project Manager in the Electrics/Electronics Department at the Center of Research and Development. He was responsible for the HVAC Control Electronics of the 1 series and 3 series from 2001 to 2005. In 2005 he took over the responsibility for predevelopment of hybrid vehicle power supply systems for the 1st and 2nd generation. Since 4 years now, he's Project Manager for Predevelopment.

Resume 
Ottmar Sirch received his Dipl.-Ing. Univ. degree in Electrical Engineering at the Technical University of Munich in 1985. During his main study period he focused on semiconductor technologies. He did his Dipl.-Ing. thesis on CMOS Latch-up in 1985. Afterwards he was working 16 years in the semiconductor industry at Siemens Semiconductor Group (from 1999 Infineon Technologies) in several fields and positions (CMOS technology development for VLSI-Logic, Physical Failure Analysis of Integrated Ciruits for Quality and Reliability Strategic and Technical Sales and Marketing for Automotive Semiconductors) He joined BMW Group in 2001.

Other 
Additionally, Ottmar Sirch is chairing the conference “Electrics/Electronics in Hybrid and Electric Vehicles and electrical Energy Management” of Haus der Technik e.V. Essen since 2008.

Next, we will give some details about BMW's vision on 48 v.