Power supply device, automatic steering vehicle, and power supply method

A power supply device provided in an automatic steering vehicle having a vehicle body, and a bogie including a running wheel allowing the vehicle body to run on a track and a steering device capable of automatically steering the running wheel, the power supply device comprising:

• a primary power supply system that supplies power to a motor that rotationally drives the running wheel;
• a voltage converter unit that converts a voltage by supplying a part of the power of the primary power supply system;
• a secondary power supply system that supplies the power converted by the voltage converter unit to the steering device;
• a primary backup power supply capable of supplying the power to the voltage converter unit when the voltage of the power detected by the primary power supply system is smaller than a predetermined value;
• and
• a secondary backup power supply that is provided in the secondary power supply system to supply the power to the steering device,
• wherein the secondary backup power supply is capable of supplying the power to the steering device when the voltage of the power detected by the voltage converter unit is smaller than a predetermined value,
• wherein the steering device includes an actuator that steers the running wheel and a sensor for determining an amount of operation of the actuator,
• the secondary power supply system includes a steering system that supplies the power to the actuator and a sensor system that supplies the power to the sensor, and
• the secondary backup power supply is provided in each of the steering system and the sensor system.