| 主权项 |
1. An apparatus for collecting wireless energy, the apparatus comprising:
an antenna configured to generate an alternating current (AC) voltage from a radio wave; and a collection circuit configured to generate a direct current (DC) voltage corresponding to the AC voltage, determine whether the DC voltage is lower than a preset value due to impedance mismatching, and change an internal impedance, including an internal resistance via a control signal if it is determined that the DC voltage is lower than the preset voltage, until the DC voltage is increased to a value equal to or higher than the preset voltage, wherein the collection circuit comprises:
a rectifier configured to output the DC voltage by rectifying the AC voltage,an impedance transformer connected to the antenna and the rectifier, and configured to change the internal impedance, including an internal resistance of the collection circuit according to the control signal;a detector configured to detect the DC voltage output from the rectifier; anda controller configured to determine whether the detected DC voltage is lower than the preset voltage, to produce the control signal; andchange the impedance of the impedance transformer by sending the control signal to the impedance transformer, if it is determined that the detected DC voltage is lower than the preset voltage. |
