METHOD FOR PROVIDING A POWER SUPPLY FOR AT LEAST ONE ELECTRICALLY HEATABLE CATALYST OF A MOTOR VEHICLE SITUATED IN AN EXHAUST GAS TRACT, AND A MOTOR VEHICLE COMPRISING AT LEAST ONE ELECTRICALLY HEATABLE CATALYST SITUATED IN AN EXHAUST GAS TRACT OF THE MOTOR VEHICLE

A method for providing a power supply for at least one electrically heatable catalyst of a motor vehicle situated in an exhaust gas tract, wherein the motor vehicle comprises a first battery, by means of which a first voltage Uis generated, and a second battery, by way of which a second voltage Uis generated, wherein the at least one catalyst during a start phase immediately following the start of an internal combustion engine of the motor vehicle is supplied by a power Pprovided by the first battery such that the voltage Uof the first battery is imposed on the at least one catalyst, wherein the at least one catalyst is additionally supplied during the start phase by a power Pprovided by the second battery such that the voltage Uof the second battery is transformed by a DC converter to the value of the voltage Uwhich is imposed on the at least one catalyst.