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US 11,444,485 B2Granted
Inductive charging system with charging electronics physically separated from charging coil
AssigneeMojo Mobility, Inc.
InventorAfshin Partovi
Life of this patent
Estimating the term…
Abstract
An inductive charger where the charging surface or coil is separated from the drive or control electronics is described.
Claims33
An inductive charger for transmitting power to an inductive receivers of an electronic device for charging the electronic device, the inductive charger comprising:
- a metallic first enclosure having a non-metallic charging surface, the first enclosure comprising:
- an inductive charging coil comprising a spiral-shaped metallic Litz wire conductor that defines two charging coil terminals,
- wherein the inductive charging coil has a first side that faces the charging surface and a second side that faces away from the charging surface opposite the first side, and
- wherein the inductive charging coil is configured to transmit electromagnetic power by inductive power transfer through the charging surface of the enclosure with an alternating magnetic field at an operating frequency within a frequency range of 100 kHz to 1 MHz when an electronic device is positioned in proximity to the charging surface;
- and
- a soft magnetic shielding material positioned proximate the second side of the charging coil away from the charging surface;
- a metallic second enclosure physically separated from the first enclosure, the second enclosure comprising:
- a drive circuit and a resonant capacitor electrically coupled to the inductive charging coil in the first enclosure to drive the inductive charging coil with an alternating current;
- and
- a microcontroller electrically coupled to the drive circuit, wherein the microcontroller is configured to:
- detect a received communication of information in a current or voltage modulation of the inductive charger coil by the inductive receiver;
- and
- control the transmission of power during inductive power transfer;
- and
- an electrical cable that electrically couples the first enclosure and the second enclosure,
- wherein the cable comprises only two sets of twisted wires coupled to the two electrical terminals of the inductive charging coil to provide power and communication between the inductive charging coil in the first enclosure and the drive circuit and the microcontroller in the second enclosure, each set of twisted wires comprising multiple electrical wires to reduce electrical loss,
- wherein the cable further comprises a metallic electromagnetic shield coupled to an
- electrical ground that covers the two sets of twisted wires, and
- wherein the cable is at least ten centimeters in length.
16 more elements
An inductive charger for transmitting power to an inductive receiver of an electronic device for charging the electronic device, the inductive charger comprising:
- a metallic first enclosure having a non-metallic charging surface, the first enclosure further comprising:
- an inductive charging coil comprising a spiral-shaped metallic Litz wire conductor that defines two charging coil terminals,
- wherein the inductive charging coil has a first side that faces the charging surface and a second side that faces away from the charging surface opposite the first side, and
- wherein the inductive charging coil is configured to transmit electromagnetic power by inductive power transfer through the charging surface of the enclosure with an alternating magnetic field at an operating frequency within a frequency range of 100 kHz to 1 MHz when an electronic device is positioned in proximity to the charging surface;
- and
- a soft magnetic shielding material positioned proximate the second side of the charging coil away from the charging surface;
- a metallic second enclosure physically separated from the first enclosure, the second enclosure comprising:
- a drive circuit and resonant capacitor electrically coupled to the inductive charging coil in the first enclosure to drive the inductive charging coil with an alternating current;
- and
- a microcontroller electrically coupled to the drive circuit, wherein the microcontroller is configured to:
- detect a received communication of information in a current or voltage modulation of the inductive charger coil by the inductive receiver;
- and
- control the transmission of power during inductive power transfer;
- and
- a cable means for electrically coupling the first enclosure and the second enclosure,
- wherein the cable means comprises only two sets of twisted wires coupled to the two electrical terminals of the inductive charging coil to provide power and communication between the inductive charging coil in the first enclosure and the drive circuit and the microcontroller in the second enclosure, each set of twisted wires comprising multiple electrical wires to reduce electrical loss,
- wherein the cable means further comprises a metallic electromagnetic shield coupled to an electrical ground that covers the two sets of twisted wires, and
- wherein the cable means is at least ten centimeters in length.
15 more elements
An inductive charger for transmitting power to an inductive receiver of an electronic device for charging the electronic device, the inductive charger comprising:
- a metallic first enclosure having a non-metallic charging surface, the first enclosure comprising:
- an inductive charging coil comprising a spiral-shaped metallic Litz wire conductor that defines two charging coil terminals,
- wherein the inductive charging coil has a first side that faces the charging surface and a second side that faces away from the charging surface opposite the first side, and
- wherein the inductive charging coil is configured to transmit electromagnetic power by inductive power transfer through the charging surface of the enclosure with an alternating magnetic field at an operating frequency within a frequency range of 100 kHz to 1 MHz when an electronic device is positioned in proximity to the charging surface;
- and
- a shield layer comprising a polymer layer and a heat conducting material in front of the inductive charging coil for heat distribution positioned proximate the second side of the charging coil away from the charging surface;
- a metallic second enclosure physically separated from the first enclosure, the second enclosure comprising:
- a drive circuit and a resonant capacitor electrically coupled to the inductive charging coil in the first enclosure to drive the inductive charging coil with an alternating current;
- and
- a microcontroller electrically coupled to the drive circuit, wherein the microcontroller is configured to:
- detect a received communication of information in a current or voltage modulation of the inductive charger coil by the inductive receiver;
- and
- control the transmission of power during inductive power transfer;
- and
- a cable means for electrically coupling the first enclosure and the second enclosure,
- wherein the cable means comprises only two sets of twisted wires coupled to the two electrical terminals of the inductive charging coil to provide power and communication between the inductive charging coil in the first enclosure and the drive circuit and the microcontroller in the second enclosure, each set of twisted wires comprising multiple electrical wires to reduce electrical loss,
- wherein the cable means further comprises a metallic electromagnetic shield coupled to an electrical ground that covers the two sets of twisted wires, and
- wherein the cable means is at least ten centimeters in length.
15 more elements
Dependencies are inferred from the claim text.