TDK: well equipped for 48V
Some attractive advantages are offered by 48V technology for vehicles: It helps to reduce overall fuel consumption, reduces the environmental impact and can even improve the engine performance. The central component for this is a powerful buck-boost converter. With its power inductors and aluminium electrolytic capacitors, TDK offers key passive components for this purpose.
In view of the growing demands to reduce fuel consumption and CO2
emissions, 48V technology
offers attractive advantages. They are not a replacement for existing 12V architectures, but rather represent more of an extension to the 12V systems for handling powerful loads and is coupled to these systems by means of a buck-boost converter.
Efficient coupling by means of buck-boost converter
The most important component of a combined 12/48V system is the buck-boost converter which permits the
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As an alternative to the SMD types, the EPCOS ERU 33 types with their PTH terminations can also be used
bidirectional flow of energy between the two voltage levels. Figure 1 (right) shows the circuit diagram of such a converter.
TDK has developed two new series of EPCOS power inductors for the storage and smoothing chokes in the converters. The ERU 27 series of inductors, for example, are SMD components. They are characterised by their high current capabilities and very compact footprint of just 30mm x 27.8mm (Figure 2, right). Their insertion height is 15.5mm or 20.3mm, depending on their inductance value. This compact design is made possible by the use of a flat winding that offers a high volume fill factor. The inductors are available in six versions covering an inductance range of 3.5µH to 15µH. Their saturation current varies between 19A and 49A.
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