Control system for wireless power charging and alignment

A method of charging an implantable device, the method comprising:

• measuring a set of electrical parameters of the implantable device;
• determining a present electromagnetic (“EM”) field value at the implantable device based on a first subset of electrical parameters of the set of electrical parameters of the implantable device;
• determining a target EM field value at the implantable device based on a second subset of electrical parameters of the set of electrical parameters of the implantable device, the first subset of electrical parameters being distinct from the second subset of electrical parameters;
• and
• transmitting the present EM field value and the target EM field value to a wireless charger for controlling an EM field driver of the wireless charger.

A method of aligning a charger for an implantable device, the method comprising:

• outputting, at the charger, a beacon electromagnetic (“EM”) field;
• receiving a present beacon EM field value and a target EM field value from the implantable device, the present beacon EM field value being based on the beacon EM field;
• determining that, at a present location of the charger, the charger can produce a charging EM field capable of outputting sufficient power to charge the implantable device based on (i) a maximum electrical parameter of the charger, (ii) the present beacon EM field value, (iii) the target EM field value, (iv) a beacon electrical parameter of the charger corresponding to the beacon EM field;
• and
• generating a notification based on determining that the charger can produce the charging EM field.

A charger system, comprising:

• a wireless field driver that produces an electromagnetic (“EM”) field;
• a signal receiver;
• and
• a controller in communication with a wireless charger, the controller comprising;
• a processor configured to execute processor executable instructions stored in a non-transitory computer-readable medium configured to cause the processor to:
• receive a present EM field value from an implantable device;
• receive a target EM field value from the implantable device;
• determine a power setting for the wireless field driver based on the present EM field value and the target EM field value;
• and
• transmit the power setting to the signal receiver for controlling a power input of the wireless field driver.

A method of estimating an electromagnetic (“EM”) field at an implantable device, comprising:

• determining a rectifier voltage at a rectifier of the implantable device;
• determining a rectifier current at the rectifier of the implantable device;
• comparing the rectifier voltage and the rectifier current to an electrical model of the implantable device to estimate a present EM field value, the electrical model of the implantable device representing a relationship between the rectifier voltage, the rectifier current, and a present EM field value;
• and
• providing the present EM field value to a wireless charger for controlling an EM field emitted by the wireless charger.

An implantable device comprising:

• an EM field receiving coil that receives a charging EM field, the EM field receiving coil electrically connected to a rectifier circuit;
• a first antenna;
• and
• a processor that:
• receives one or more electrical signals from the rectifier circuit and a battery of the implantable device;
• determines a present EM field value based on the one or more electrical signals;
• determines a target EM field value based on the one or more electrical signals;
• and
• transmits, using the first antenna, the present EM field value and the target EM field value to a second antenna of a wireless charger.