POWER SUPPLY DEVICE OF AN ELECTRICAL SYSTEM OF A MOTOR VEHICLE HAVING A HIGH POWER CHARGE

摘要

The invention relates to a device for supplying power to an electrical system (10) of a motor vehicle comprising an electric heating resistor (18).The invention is characterized in that the power supply device comprises, in addition to a first battery (B1), a second battery (B2), a first relay (RE1), a second relay (RE2) and an electronic control circuit (24) for supplying electric control signals of the relays (RE1, RE2) in accordance with the temperature of the heating element, the position of the master key and the voltages at the terminals of the electrical system (10). The invention can notably be used for heating the catalyst container before the engine is started.