Systems, devices, and methods for wireless power transfer from power source system to medical implant

A wirelessly powered medical implant system comprising:

• a power source system including:
• an automatic gain controller to receive input power, automatically adjust the input power based on a feedback signal with an offset phase delay, and provide the adjusted input power as output power;
• a source resonator to generate, based on the output power, a magnetic field to transmit wireless power via the magnetic field, and provide the feedback signal;
• an offset phase delay circuit to receive the feedback signal from the source resonator, generate the offset phase delay, and include the offset phase delay with the feedback signal;
• and
• a source controller to control the input power based on a power signal to limit the received power based on a threshold;
• and
• a medical implant including:
• an implant resonator to receive the transmitted wireless power via the magnetic field;
• and
• one or more sensors to respond to a stimulus of the medical implant using the received power,
• wherein the feedback signal is based on inductive coupling of the magnetic field between the source resonator and the implant resonator.

A wirelessly powered medical implant system comprising:

• a power source system including:
• an automatic gain controller to receive input power, automatically adjust the input power based on a feedback signal with an offset phase delay, and provide the adjusted input power as output power;
• a source resonator to generate, based on the output power, a magnetic field to transmit wireless power via the magnetic field, and provide the feedback signal, wherein the source resonator includes:
• a resonant tank circuit,
• a switch to drive the resonant tank circuit, and
• a switch protector to limit power to the switch;
• and
• an offset phase delay circuit to receive the feedback signal from the source resonator, generate the offset phase delay, and include the offset phase delay with the feedback signal;
• and
• a medical implant including:
• an implant resonator to receive the transmitted wireless power via the magnetic field;
• and
• one or more sensors to respond to a stimulus of the medical implant using the received power,
• wherein the feedback signal is based on inductive coupling of the magnetic field between the source resonator and the implant resonator.