Patent ID: 8648564
Filing Date: 2014-02-11
Classification: H02J

Abstract:
1. A power transmitting device on which a power receiving device can be placed, the power receiving device charging a built-in battery by using wirelessly received power, the power transmitting device comprising: a power supply unit comprising a power input terminal and configured to generate a transmission power by using power supplied to the power input terminal; a power transmitting coil configured to wirelessly transmit the transmission power to the power receiving device; a first switch, once the first switch being turned on by receiving a switch-on control, the first switch electrically connecting an external power supply and the power input terminal until the first switch being turned off next time by receiving a switch-off control, and once the first switch being turned off by receiving the switch-off control, the first switch electrically disconnecting the external power supply and the power input terminal until the first switch being turned on next time by receiving the switch-on control; a piezoelectric element disposed at a position at which a weight of the placed power receiving device can be detected, and the piezoelectric element configured to generate a detection power according to the weight of the placed power receiving device; and a first switch controller configured to generate a starting power by the detection power and switch the first switch to on by using the starting power.