Vehicle and vehicle control method

A vehicle, comprising:

• a first buck converter that performs a buck operation so that a first target voltage is generated, and outputs a stepped-down electric power to a first power line;
• a second buck converter that performs a buck operation so that a second target voltage is generated, and outputs a stepped-down electric power to the first power line;
• a third buck converter that performs a buck operation so that a third target voltage is generated, and outputs a stepped-down electric power to a second power line;
• a fourth buck converter that performs a buck operation so that a fourth target voltage is generated, and outputs a stepped-down electric power to the second power line;
• an auxiliary battery that is charged through the buck operation of the first to fourth buck converters;
• a controller that outputs the first to fourth target voltages to the first to fourth buck converters, respectively;
• a traction motor;
• a power converter that drives the traction motor;
• a power storage device;
• a charger that charges the power storage device with an electric power supplied from outside the vehicle;
• a first cooling system that cools the power converter;
• and
• a second cooling system that cools the charger, wherein
• the first buck converter is disposed inside the power converter,
• the second buck converter is disposed outside the power converter and the charger,
• the third buck converter is disposed inside the charger, and
• the fourth buck converter is disposed inside the power converter, wherein
• the controller:
• sets the first target voltage higher than the second target voltage when the controller causes the power converter to operate;
• and
• sets the third target voltage higher than the fourth target voltage when the controller causes the charger to operate.

A method of control of a vehicle,

• the vehicle including:
• a first buck converter that performs a buck operation so that a first target voltage is generated, and outputs a stepped-down electric power to a power line;
• a second buck converter that performs a buck operation so that a second target voltage is generated, and outputs a stepped-down electric power to the power line;
• an auxiliary battery that is charged with an electric power transmitted through the power line;
• a cooling system;
• and
• equipment that is cooled by the cooling system, wherein
• the first buck converter is disposed inside the equipment, and
• the second buck converter is disposed outside the equipment,
• the method, comprising:
• determining whether to cause the equipment to operate;
• and
• setting the first target voltage higher than the second target voltage when the equipment is caused to operate.