Power and communications regulation for wireless power transfer

A wireless power receiver comprising:

• a wireless power receiving coil having an AC voltage induced thereacross when the wireless power transmitting coil is magnetically coupled to by a wireless power transmitting coil of a wireless power transmitter;
• a rectifier comprising a plurality of switching devices having an input that receives the AC voltage across the wireless power receiving coil and produces a rectifier output voltage;
• and
• wireless power receiver control circuitry that operates the switching devices of the regulator and communicates with the wireless power transmitter, wherein the wireless power receiver control circuitry further:
• monitors the rectifier output voltage and determines a rectifier voltage error by comparing the rectifier output voltage to a reference;
• responsive to the rectifier voltage error indicating a need for an increased wireless power transfer level, computing a power feedback parameter based on the rectifier voltage error in accordance with a first equation;
• responsive to the rectifier voltage error indicating a need for a decreased wireless power transfer level, computing the power feedback parameter based on the rectifier voltage error parameter in accordance with a second equation;
• and
• sends a communication packet including the power feedback parameter to the wireless power transmitter.

A wireless power receiver comprising:

• a wireless power receiving coil having an AC voltage induced thereacross by a wireless power transmitting coil of a wireless power transmitter when the wireless power transmitting coil is magnetically coupled to the wireless power receiving coil;
• a rectifier comprising a plurality of switching devices having an input that receives the AC voltage across the wireless power receiving coil and produces a rectifier output voltage;
• and
• wireless power receiver control circuitry that operates the switching devices of the regulator and communicates with the wireless power transmitter, wherein the wireless power receiver control circuitry determines whether the wireless power transfer system is power limited;
• and:
• responsive to the wireless power transfer system not being power limited, sends the control error packet according to a first communications loading control policy;
• and
• responsive to the wireless power transfer system being power limited, sends the control error packet according to a second communications loading policy.