| 摘要 |
To improve RF-DC conversion efficiency even when input power is varied. Provided is a power receiving device (1) including: a plurality of antennas (11), a plurality of rectenna rectifying circuits (12) each of which is provided to correspond to each of the antennas (11) and each of which converts electromagnetic waves received by the corresponding antenna (11) into DC power and outputs the DC power; a connection switching circuit (13) which is provided between the plurality of rectenna rectifying circuits (12) and a load (20) and which performs switching between serial/parallel connection states of the output side of the plurality of rectenna rectifying circuits (12); a current sensor (14) which measures current flowing through the load (20); and a control section (15) which, on the basis of the current measured by the current sensor (14), selects a serial/parallel connection state of the rectenna rectifying circuits (12), the state enabling the RF-DC conversion efficiency to be maximized, and which controls the connection switching circuit (13) so that the rectenna rectifying circuits (12) is in the selected serial/parallel connection state. |
