Power transmitting device having wire-free power transfer safety detection

A non-transitory machine-readable medium comprising one or more instructions, wherein execution of the instruction by a controller is to cause the controller to:

• provide power to a plurality of power transfer contacts based on a plurality of time periods having a frequency shifted such that a length of a second one of the time periods is different than a length of a first one of the time periods;
• disconnect power to the power transfer contacts during a plurality of test time durations;
• obtain data during the plurality of test time durations;
• and
• provide wire-free power transfer to a receiving device at times other than the test time durations.

A method of power transfer to a receiving device comprising:

• providing power to a plurality of power transfer contacts based on a plurality of time periods having a frequency shifted such that a length of a second one of the time periods is different than a length of a first one of the time periods;
• disconnecting power to the power transfer contacts during a plurality of test time durations;
• obtaining data during the plurality of test time duration;
• and
• providing wire-free power transfer to the receiving device at times other than the test time durations.

A wire-free power transfer system, comprising:

• a power receiving device and a power transmitting device,
• wherein the power receiving device comprises a plurality of power receiving conductive contacts to electrically couple the power receiving device to the power transmitting device, and
• wherein the power transmitting device comprises:
• a power driver to selectively provide power to a plurality of power transfer contacts, wherein the plurality of power transfer contacts are to provide power to the power receiving device via the plurality of power receiving conductive contacts, and
• a controller coupled to the power driver, the controller to:
• control the power driver to provide power to the plurality of power transfer contacts based on a plurality of time periods having a frequency shifted such that a length of a second one of the time periods is different than a length of a first one of the time periods,
• control the power driver to disconnect power from the power driver to the power transfer contacts during a plurality of test time durations,
• obtain data during the plurality of test time durations, and
• provide wire-free power transfer to the power receiving device at times other than the test time durations.