Power supply device and abnormality determination method for power supply device

A power supply device in which a plurality of converters, each converting a DC voltage by performing switching using a switching element, are connected in parallel, and that are configured to supply, to a load, a sum of output power from the converters, obtained by turning ON respective switching elements of the converters in phases that are different from one another, the power supply device comprising:

• a control device configured to:
• turn ON/OFF the switching element of only a given converter out of the converters, for a predetermined period of time, so as to change a current that is to be supplied to the load to a predetermined current;
• and
• determine, upon the driving means turning ON/OFF the switching element, whether or not a difference between the current to be supplied to the load and the predetermined current is greater than a predetermined threshold value.

An abnormality determination method for a power supply device in which a plurality of converters, each converting a DC voltage by performing switching using a switching element, are connected in parallel, and that are configured to supply to a load, a sum of output power from the converters, obtained by turning ON respective switching elements of the converters in phases that are different from one another, the abnormality determination method being for determining whether or not the converters are abnormal, the abnormality determination method comprising:

• turning ON/OFF the switching element of only a given converter out of the converters, for a predetermined period of time, so as to change a voltage (or a current) that is to be supplied to the load to a predetermined voltage (or a predetermined current);
• determining whether or not a difference between the voltage (or the current) to be supplied to the load and the predetermined voltage (or the predetermined current) is greater than a predetermined threshold value;
• and
• determining that the given converter is abnormal upon determining that the difference is greater than the predetermined threshold value.