| CPC H02J 50/10 (2016.02) [G06K 19/0704 (2013.01); H02J 7/0013 (2013.01); H02J 50/40 (2016.02); H02J 50/402 (2020.01); H02J 50/90 (2016.02); H02J 7/007 (2013.01)] | 34 Claims |
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1. A system for providing power inductively to a portable device comprising a battery and an inductive receiver unit including a receiver coil and a receiver circuit, the system comprising:
a first primary coil that is substantially planar, substantially spiral shaped, and substantially parallel to a charging surface of the system for providing power inductively to the portable device;
a first drive circuit, including a field-effect transistor (FET) driver, a capacitor, and a FET switch, coupled to a DC voltage input and coupled to the first primary coil, wherein the first drive circuit is configured to apply an alternating electrical current to the first primary coil to generate a magnetic field in a direction substantially perpendicular to the plane of the first primary coil and the charging surface of the system to provide power inductively to the portable device;
a first sense circuit to monitor current flow through the first primary coil during operation of the first drive circuit to sense a modulation of the current in the first primary coil from modulation of an induced current in the receiver coil; and
a communication and control circuit, including a micro control unit coupled to the first drive circuit and the first sense circuit, configured to:
detect, through the first sense circuit, communication of information in the modulation of the current in the first primary coil;
operate the first drive circuit at an operating frequency and a duty cycle to inductively transfer sufficient power to the inductive receiver unit to activate and power the receiver circuit to enable the receiver circuit to communicate the information in the modulation of the current in the first primary coil, wherein the communication of information includes information to enable the communication and control circuit to configure the provision of power inductively to the portable device, wherein the received communication of information includes:
information corresponding to a voltage or current at an output of the receiver circuit induced by the first primary coil;
a unique identification code;
a charge algorithm profile; and
a power requirement;
operate the first drive circuit according to the power requirement and charge algorithm profile to provide the power from the first primary coil to the receiver coil to power the receiver unit and charge the battery of the portable device, wherein to charge the battery of the portable device the communication and control circuit is further configured to:
receive additional information in the modulation of the current in the first primary coil from the modulation of the induced current in the receiver coil corresponding to the voltage or current at the output of the receiver circuit while charging the battery of the portable device;
regulate in a closed loop feedback manner the voltage or current at the output of the receiver circuit in accordance with the received additional information corresponding to the voltage or current at the output of the receiver circuit by adjusting at least one of the operating frequency, the duty cycle, and a DC voltage at the DC voltage input of the first drive circuit during charging of the battery of the portable device;
monitor for continued presence of the portable device and completion of the charging of the battery of the portable device based on the communication from the receiver circuit and detected by the communication and control circuit through the first sense circuit; and
if the portable device is no longer present or charging is complete, stop operation of the first drive circuit for the provision of power inductively to the portable device.
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