Power supply system and power supplying method for detecting a short circuit in the feedback

A power supply system for receiving power from a main power supply and powering a load, the power supply system comprising:

• first and second power supply lines to respectively connect positive and negative electrode terminals of the load with the main power supply;
• first and second voltage detection lines, each of which has opposing first and second ends, the first ends of the first and second voltage detection lines being connected to the respective first and second power supply lines;
• a feedback controller connected to the second ends of the respective first and second voltage detection lines, the feedback controller being configured to:
• detect a voltage between the positive and negative electrode terminals of the load via the first and second voltage detection lines;
• and
• perform feedback control by controlling an input voltage input to the load based on the detected voltage between the positive and negative electrode terminals of the load;
• first and second inspection power supplies respectively disposed on first and second wirings respectively connected to the first and second voltage detection lines,
• the first and second inspection power supplies being selectively activated,
• the first inspection power supply supplying power and providing a first potential difference to the first voltage detection line from the first power supply line when actuated,
• the second inspection power supply supplying power and providing a second potential difference to the second voltage detection line from the second power supply line when actuated;
• and
• a power supply controller to control the power supply system,
• wherein
• when a selected one of the first and second inspection power supplies is activated to provide a corresponding one of the first and second potential differences to a corresponding one of the first and second voltage detection lines, the power supply controller recognizes a short circuit occurring in the selected one of the first and second voltage detection lines when determining that a difference between a preset voltage and an inspection voltage is a threshold value or more, the inspection voltage being caused between the first and second voltage detection lines with the corresponding one of the first and second potential differences being provided to the selected one of the first and second voltage detection lines.