Wireless power control system

Wireless power transmitting equipment, comprising:

• a wireless power transmitting coil;
• a wireless power transmitter circuit coupled to the wireless power transmitting coil and configured to provide alternating-current signals to the wireless power transmitting coil, wherein the wireless power transmitting coil is configured to wirelessly transmit power at a wireless power transmission level to wireless power receiving equipment when provided with the alternating-current signals, wherein the wireless power receiving equipment is movable relative to the wireless power transmitting coil;
• signal monitoring circuitry coupled to the wireless power transmitting coil that is configured to gather signal phase and amplitude measurements;
• and
• control circuitry configured to, while the wireless power receiving equipment is powering a load at the wireless power receiving equipment using the transmitted wireless power:
• receive, using the wireless power transmitting coil, wirelessly transmitted feedback information from the wireless power receiving equipment,
• control the wireless power transmitter circuit to perform a first adjustment of the wireless power transmission level based on the signal phase and amplitude measurements, and
• control the wireless power transmitter circuit to perform a second adjustment of the wireless power transmission level by computing a value dependent on the feedback information and the signal phase and amplitude measurements, wherein the second adjustment is subsequent to the first adjustment.

Wireless power transmitting equipment, comprising:

• a transmitting coil circuit comprising a wireless power transfer coil and a capacitor;
• a radio-frequency inverter that has an output that is coupled to the transmitting coil circuit and that is configured to provide alternating-current signals to the transmitting coil circuit, wherein the transmitting coil circuit is configured to transmit wireless power at a wireless power transmission level when the alternating-current signals are provided to the transmitting coil circuit;
• a current sensor;
• a voltage sensor;
• and
• control circuitry configured to:
• gather a current measurement from the current sensor and a voltage measurement from the voltage sensor,
• receive wirelessly transmitted information associated with a rectifier output voltage from wireless power receiving equipment that is movable relative to the wireless power transfer coil and that has a load that is powered by the wireless power,
• compute an effective load resistance of the load of the wireless power receiving equipment as a function of the wirelessly transmitted information, the current measurement, and the voltage measurement, and
• detect a fault condition associated with the wireless power receiving equipment based on the computed effective load resistance.