Automotive Battery And Component Technologies Address Start-Stop Design Challenges

by David Jacquinod, International Rectifier, El Segundo, Calif., How2Power Today, Sep 28 2012

Focus:
Start-stop systems have become one of the most rapidly adopted “hybrid” technologies as vehicle manufacturers look to meet targets for improved fuel efficiency and lower pollutant emissions while keeping costs down. However, effective implementation of these systems poses challenges for the designer, ranging from how to maintain a stable electricity supply to key systems during shut-off and restart operation to selecting components that will cope with the harsh automotive environment. At a system level, issues such as starter-motor technology and limitations on lead-acid batteries also need to be considered. This article looks at key challenges facing automotive designers when implementing start-stop systems and discusses new and emerging technologies meant to address these challenges. These technologies include the absorptive glass mat (AGM) battery, the integrated starter-alternator, and automotive-qualified power MOSFETs and gate-driver ICs. Requirements for the MOSFETs and gate drivers in the load switch application in start-stop systems are discussed. Examples MOSFETs (the 24-V AUIRF1324S-7L and 40-V AUIRF3004-7L) and a gate driver (the AUIR3240S) from International Rectifier are discussed. In discussing the AUIR3240S, the author describes its operation in detail as this device was specifically developed to support start-stop operation.

What you’ll learn:

• How to understand unique design challenges and technology options associated with development of start-stop systems for hybrid vehicles

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