Patent ID: 8907647

Claim:
A control device of a transformer that boosts or drops an output voltage of a DC power supply and provides the output voltage to a load, the control device comprising: a switching controller which performs switching control of the transformer; a load power deriving unit which derives load power; a transformer loss decrease amount deriving unit which derives a decrease amount of loss generated in the transformer assuming the switching controller performs intermittent control of the transformer, based on the load power derived by the load power deriving unit and a transformer ratio of the transformer, wherein the amount of loss generated in the transformer is decreased when changing from ordinary control of the transformer to intermittent control of the transformer; a load loss increase amount deriving unit which derives an increase amount of loss generated in the load assuming the switching controller performs the intermittent control of the transformer, wherein the amount of loss generated in the load is increased when changing from ordinary control of the transformer to intermittent control of the transformer; and a control command unit which instructs the switching controller to perform the intermittent control of the transformer under at least one condition that the decrease amount of transformer loss derived by the transformer loss decrease amount deriving unit is larger than the increase amount of load loss derived by the load loss increase amount deriving unit.