| CPC H02J 50/10 (2016.02) [G06F 1/1683 (2013.01); H02J 7/00041 (2020.01); H02J 7/0013 (2013.01); H02J 7/0047 (2013.01); H02J 7/00714 (2020.01); H02J 50/05 (2016.02); H02J 50/12 (2016.02); H02J 50/402 (2020.01); H02J 50/70 (2016.02); H02J 50/80 (2016.02); H02J 50/90 (2016.02); H02J 2300/22 (2020.01)] |
| AS A RESULT OF REEXAMINATION, IT HAS BEEN DETERMINED THAT: |
| The patentability of claims 1, 5, 12 and 21 is confirmed. |
| Claims 2-4, 6-11, 13-20 and 22-30 were not reexamined. |
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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 and substantially parallel to a charging surface of the system for providing power inductively to the portable device;
a first drive circuit, including a PET driver, a capacitor, and a PET switch, coupled to a DC voltage input and coupled to the first primary coil, wherein during operation the first drive circuit is configured to apply an alternating electrical current to the first primary coil at an operating frequency and duty cycle to generate an alternating 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, wherein the operating frequency is within a range of frequencies (i) that are near a resonance frequency of a circuit comprising the first primary coil and the capacitor, (ii) such that increasing values of the operating frequency within the range of frequencies would correspond to a lower voltage or current induced in an output of the receiver circuit and (iii) that allow activation and powering of the receiver unit and charging the battery of the portable device;
a first sense circuit, including a low pass filter and an amplifier, coupled to the first primary coil to detect communication of information induced in the first primary coil by the receiver coil; and
a communication and control circuit, including a micro-controller coupled to the first drive circuit and the first sense circuit, configure to:
detect, through the first sense circuit, a received communication of information in the first primary coil;
operate the first drive circuit to inductively transfer power from the first primary coil to the receiver coil to activate and power the receiver unit to enable the receiver circuit to communicate the information detected in the first primary coil via the first sense circuit, wherein the received communication of information includes information to enable the communication and control circuit to configure the inductive transfer of power to the portable device, wherein the received communication of information includes:
information corresponding to a voltage or current induced by the first primary coil at the output of the receiver circuit;
a unique identification code; and
a power requirement; and
operate the first drive circuit according to the power requirement 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 first primary 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 age 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 while charging 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 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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