Automatic gain control for communications demodulation in wireless power transmitters

A wireless power transmission system that is configured to deliver wireless power to a wireless power receiver system comprising a receiver antenna, the wireless power transmission system comprising:

• a transmission antenna configured to (i) receive an AC signal, (ii) generate an alternating electromagnetic field for delivering the wireless power to the wireless power receiver system, and (iii) couple with the receiver antenna via the alternating electromagnetic field;
• at least one sensor configured to monitor the AC signal to detect modifications to a voltage of the AC signal that are caused by the wireless power receiver system modifying the alternating electromagnetic field;
• a demodulation circuit configured to:
• receive, as input from the at least one sensor, detected modifications to the voltage of the AC signal;
• based on the detected modifications to the voltage of the AC signal, detect a change in a voltage of a wireless power signal that is indicative of incoming data in-band of the AC signal;
• based on detecting the change in the voltage of the wireless power signal that is indicative of incoming data in-band of the AC signal, set a threshold for change in voltage by providing instructions to a first digital potentiometer, the threshold for change in voltage indicative of a data alert;
• determine if the change in the voltage of the wireless power signal meets or exceeds the threshold for change in voltage;
• generate an alert if the change in voltage of the wireless power signal meets or exceeds the threshold for change in voltage;
• and
• output a plurality of data alerts, the plurality of data alerts indicative of the incoming data in-band of the AC signal that is related to operations of a wireless power receiver system that is coupled with the wireless power transmission system;
• a transmitter controller configured to (i) receive the plurality of data alerts and (ii) decode the plurality of data alerts to decode a data signal represented by the wireless power receiver system modifying the alternating electromagnetic field.