Power supply device for vehicles has converter for converting energy between first and second voltages operated depending on load current, current at output terminal of second battery

摘要

The device has a first battery (12) for supplying power at a first voltage, a second battery (13) for supplying power at a second voltage to a load, a converter (120) between the two batteries for converting energy between the first and second voltages and a controller for operating the converter depending on a first current through the load and a second current at an output terminal of the second battery. .