Dynamic current limiting charging circuit
First Claim
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1. An apparatus comprising:
- a secondary charging coil receiver module configured to inductively receive a current, where the current charges a battery and powers a cellular transceiver and where the current received by the secondary charging coil is received from a primary coil of a power conversion system;
a secondary power control processor that modulates a load to transmit charge control packets to a power control processor of the power conversion system through the primary coil;
a current processor that measures an average current delivered through the secondary charging coil to the battery and associated electronics powered by the battery, the average current delivered includes an average of charging current and a peak transmitter current, the current processor is configured to calculate a current limit threshold value from the average current, and the threshold value includes the average current plus a predetermined incremental value; and
a current limiter that limits the charge current to the battery and transceiver based upon the average current, the current limiter configured to substantially minimize the dynamic loading of the transceiver from corrupting a modulated load that provides transmit charge control packets to the primary coil.
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Abstract
An apparatus is provided for an electronic device. The apparatus includes a dynamic electrical load, a secondary power coil receiver module that inductively receives a current from a primary coil of an power conversion system, a means for monitoring a current in the secondary receiver module being delivered to the dynamic load, a means for transmitting a power control signal to the power conversion system through the secondary charging coil, a current monitoring circuit that measures a current delivered to the dynamic load and a current limiter circuit that limits the current to the dynamic load based upon the measured charging current.
17 Citations
13 Claims
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1. An apparatus comprising:
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a secondary charging coil receiver module configured to inductively receive a current, where the current charges a battery and powers a cellular transceiver and where the current received by the secondary charging coil is received from a primary coil of a power conversion system; a secondary power control processor that modulates a load to transmit charge control packets to a power control processor of the power conversion system through the primary coil; a current processor that measures an average current delivered through the secondary charging coil to the battery and associated electronics powered by the battery, the average current delivered includes an average of charging current and a peak transmitter current, the current processor is configured to calculate a current limit threshold value from the average current, and the threshold value includes the average current plus a predetermined incremental value; and a current limiter that limits the charge current to the battery and transceiver based upon the average current, the current limiter configured to substantially minimize the dynamic loading of the transceiver from corrupting a modulated load that provides transmit charge control packets to the primary coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a power conversion system comprising a primary coil; and a portable electronic device comprising; a secondary charging coil receiver module configured to inductively receive a current that charges a battery, the battery powering a cellular transceiver and where the current received by the secondary charging coil is received from the primary coil of the power conversion system; a secondary power control processor that modulates a load of the secondary charging coil presented to the primary coil in order to transmit charge control packets to a power control processor of the power conversion system; a current processor that measures an average current delivered through the secondary charging coil to the battery and associated electronics powered by the battery, the average current delivered includes an average of charging current and a peak transmitter current, the current processor is configured to calculate a current limit threshold value from the average current, and the threshold value includes the average current plus a predetermined incremental value; and a current limiter that limits the charge current to the battery and transceiver based upon the average current, the current limiter configured to substantially minimize the dynamic loading of the transceiver from corrupting a modulated load that provides transmit charge control packets to the primary coil. - View Dependent Claims (10, 11, 12, 13)
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Specification