Elmos has introduced a chip set that will maintain a car's voltage when the engine is halted as part of its stop-start functionality.

The German semiconductor maker said the chip set will help vehicles save fuel and improve their CO2 balance.

The start-stop chip set consists of a multiphase boost converter and a synchronous buck converter. The boost converter is started as soon as the engine is running and the generator is supplying power. The unit is charged in just a few seconds and provides an intermediate circuit voltage of 24-48V, Elmos said.

When the engine stops and the on-board voltage drops to the level of the battery voltage, the bypass is removed and the functional units receive their supply voltage from the buck converters. Those receive their input voltage out of the energy storage.