Patent ID: 8994212
Filing Date: 2015-03-31
Classification: H02J,H02M,Y02T

Abstract:
1. An electric power supply apparatus comprising: a first electric power supply that is connected between a first node and a second node; a second electric power supply that is connected between a third node and a fourth node; a switch circuit having at least four input terminals, each of which is connected to the first node, the second node, the third node, and the fourth node, and having at least two output terminals; an electric load that is connected between the two output terminals; a reactor that is provided at least any one of between the first electric power supply and one of the first node and the second node, and between the second electric power supply and one of the third node and the fourth node; a voltage control section that alternately switches between: (A) a series state in which a voltage between both ends of the reactor is increased by connecting the first node with the fourth node, connecting the second node with a first output terminal, and connecting the third node with a second output terminal, to form a current loop that connects the first electric power supply, the second electric power supply, and the reactor in series with the electric load, and (B) a parallel state in which the voltage between both ends of the reactor is decreased by connecting the first node and the third node with the second output terminal, and connecting the second node and the fourth node with the first output terminal, to connect the first electric power supply and the second electric power supply in parallel with the electric load, and that performs, by the alternate switching, a voltage adjustment control which controls a voltage applied to the electric load to fall within a voltage range between a first voltage that is the voltage of the first electric power supply or the voltage of the second electric power supply and a second voltage that is the sum of the voltage of the first electric power supply and the voltage of the second electric power supply; and an electric motor as the electric load, wherein the voltage control section comprises, as an operation mode, a parallel mode that sets a first switch and a third switch to be closed and a second switch to be open, to connect the first electric power supply and the second electric power supply in parallel with the electric motor.