Patent ID: 9231428
Filing Date: 2016-01-05
CPC Classification: H02J

Claim Text:
1. A low-power wireless charging apparatus comprising: a plurality of primary coils; a plurality of drivers configured to periodically and sequentially transmit receiver detect signals for detecting receivers connected to the plurality of primary coils, respectively; a sensor configured to detect a current and a voltage according to a magnetic field changed by one or more of the plurality of primary coils by the receiver detect signals transmitted through the plurality of drivers; a comparator configured to compare the current and voltage detected by the sensor with pre-set values; a low-power auxiliary control device configured to generate a wake-up signal when one or more receivers are present; and a main control device configured to turn on upon receiving the wake-up signal generated by the low-power auxiliary control unit, and controllable to generate a wireless power signal for charging a corresponding receiver and transmit the generated wireless power signal.