Patent ID: 9269989
Filing Date: 2016-02-23
CPC Classification: H01M,H02J,Y02E

Claim Text:
1. An electric power supply system which supplies electric power to a load which is connected thereto, the electric power supply system comprising: a secondary battery which stores electric power generated by a power generator using natural energy; a first switch unit which disconnects and connects a charge path between the power generator and the secondary battery; and a control unit which controls the disconnection and the connection of the charge path by the first switch unit, wherein in the first switch unit, the disconnection and the connection of the charge path are controlled also by an output voltage of the power generator, wherein the control unit detects an output voltage of the secondary battery, compares the detected output voltage to a predetermined reference voltage, and judges whether the detected output voltage is higher or lower than the reference voltage, and the control unit controls the disconnection and the connection of the charge path by the first switch unit when the control unit judges that the output voltage of the secondary battery is higher than the reference voltage, and wherein the first switch unit includes a control terminal which is connected to an output terminal of the power generator or to the control unit to receive a control instruction from the power generator or the control unit, and the electric power supply system further comprises a second switch unit which switches between a connection of the control terminal of the first switch unit and the output terminal of the power generator and a connection of the control terminal of the first switch unit and the control unit based on a result of judgment by the control unit.