US20160064137A1 - Capacitively balanced inductive charging coil - Google Patents

Capacitively balanced inductive charging coil Download PDF

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Publication number
US20160064137A1
US20160064137A1 US14/840,842 US201514840842A US2016064137A1 US 20160064137 A1 US20160064137 A1 US 20160064137A1 US 201514840842 A US201514840842 A US 201514840842A US 2016064137 A1 US2016064137 A1 US 2016064137A1
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US
United States
Prior art keywords
wire
winding
coil
layer
inductive coil
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Abandoned
Application number
US14/840,842
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English (en)
Inventor
Yehonatan Perez
Makiko K. Brzezinski
Karl Ruben F. Larsson
Christopher S. Graham
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Apple Inc
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Apple Inc
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Publication date
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Priority to US14/840,842 priority Critical patent/US20160064137A1/en
Assigned to APPLE INC. reassignment APPLE INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRZEZINSKI, MAKIKO K., PEREZ, YEHONATAN, GRAHAM, Christopher S., LARSSON, KARL RUBEN F.
Publication of US20160064137A1 publication Critical patent/US20160064137A1/en
Priority to US15/664,154 priority patent/US10998121B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/02—Casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H01F41/0687—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/06—Coil winding
    • H01F41/098—Mandrels; Formers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication

Definitions

  • the described embodiments relate generally to inductive energy transfer and, more particularly, to an inductive coil design that may reduce noise in portable electronic devices.
  • the portable electronic devices referred to above operate on battery power which is what allows them to be mobile. That is, no power cords or other paraphernalia which might interfere with, or restrict, user movement are required.
  • battery life may be a significant concern to a user in that it may limit the amount of time available for his or her mobility. Batteries require periodic recharging in order to maintain their power capabilities. Battery recharging requires power cords which may present certain limitations. Thus, the use of electric battery chargers, while suited for their intended purpose, may be limited in their usefulness and convenience.
  • Inductive charging is a method by which a magnetic field transfers electricity from an external charger to a mobile device such as a phone or laptop computer eliminating wired connection.
  • Induction chargers typically use an induction coil to create an alternating electromagnetic field and a second induction coil in the portable device takes power from the electromagnetic field and converts it back into electrical current to charge the battery. The two induction coils in proximity combine to form an electrical transformer.
  • inductive charging can result in unwanted electromagnetic effects.
  • a conventional coil winding may create unbalanced capacitance that can cause unwanted common mode noise on ground planes of portable electronic devices.
  • Common mode noise is generally a form of coherent interference that affects two or more elements of an electromagnetic device in a highly coupled manner. This unwanted noise is especially troublesome for portable electronic devices that include touch sensors which require low noise on ground planes for optimal operation. The result is that use of touch sensors and screens may be significantly negatively impacted while the portable electronic device is being charged with an inductive charging device. Thus, in some cases the portable electronic device may be effectively inoperable during inductive battery charging.
  • Embodiments described herein include improved coil constructions that can reduce unwanted capacitive losses and noise generated in the transmitter and receiver coils.
  • the windings of the coil are oriented such that the surface area of wire on each half of the coil is approximately equal in order that the capacitive effects produced by the coils are balanced and noise is thus substantially reduced.
  • the portable electronic device may be a transmitter device or a receiver device.
  • One embodiment may take the form of an inductive coil comprising: a length of electrically conductive wire forming at least one winding in a planar layer, the layer including a center point, the at least one winding comprising: a first half of the winding; and a second half of the winding contiguous with the first half; wherein the wire crosses itself at a an edge of the first and second halves.
  • Another embodiment may take the form of an inductive coil comprising: first and second adjacent coil layers formed from a single wire; wherein the first layer defines a plane bisected by a line through a center point of the plane, the line defining a first half and a second half of the at least one layer; the first layer comprises a plurality of windings made from a continuous length of wire that crosses itself; the wire forms a first winding of the at least one layer before crossing itself; and the wire forms a second winding of the at least one layer after crossing itself.
  • FIG. 1 is a perspective view of a portable electronic device and a separate charging device
  • FIG. 2 is a perspective view of a portable electronic device and a charging device shown with the devices inductively coupled;
  • FIG. 3 depicts a cross-sectional view of the portable electronic device taken along line 3 - 3 in FIG. 2 ;
  • FIG. 4 depicts a simplified block diagram of one example of an inductive charging system
  • FIG. 5 is a simplified circuit diagram of an inductive charging system
  • FIG. 6 is a top view of a spirally wound inductive coil
  • FIG. 7 is a top view of a capacitively balanced inductive coil according to one embodiment
  • FIG. 8 is a side sectional view of inductive charging and receiving coils according to one embodiment.
  • FIG. 9 is a flow chart illustrating a method of manufacturing an inductive coil according to one embodiment.
  • a suitable electronic device may be any portable or semi-portable electronic device that may receive energy inductively (“receiver device”)
  • a suitable docking device may be any portable or semi-portable docking station or charging device that may transmit energy inductively (“transmitter device”).
  • Embodiments described herein provide an inductive energy transfer system that transfers energy inductively from a transmitter device to a receiver device to charge a battery or to operate the receiver device. Additionally or alternatively, communication or control signals can be transmitted inductively between the transmitter and receiver devices.
  • energy, power, or signal(s) are meant to encompass transferring energy for wireless charging, transferring energy as communication and/or control signals, or both wireless charging and the transmission of communication and/or control signals.
  • FIG. 1 there is shown a perspective view of one example of an inductive energy transfer system 11 in an unmated configuration.
  • the illustrated embodiment shows a transmitter or charging device 12 that is configured to wirelessly pass energy to a receiver device, which may be a portable electronic device 13 .
  • system 11 depicts a watch as the portable electronic device, any electronic device may be configured for use with embodiments described herein.
  • Sample electronic devices that may be configured to incorporate inductive charging as described herein include: tablet computing devices; mobile phones; computers; health monitors; wearable computing devices (e.g., glasses, a watch, clothing or the like); and so on.
  • a wearable accessory such as electronic device 13 as depicted in FIG. 1
  • the communication interface(s) can provide electronic communications between the communications device and any external communication network, device or platform, such as but not limited to wireless interfaces, Bluetooth interfaces, Near Field Communication interfaces, infrared interfaces, USB interfaces, Wi-Fi interfaces, TCP/IP interfaces, network communications interfaces, or any conventional communication interfaces.
  • the wearable device may provide information regarding time, health, statuses of externally connected or communicating devices and/or software executing on such devices, messages, video, operating commands, and so forth (and may receive any of the foregoing from an external device), in addition to communications.
  • electronic device 13 may include a controller or other electronic components.
  • the controller may execute instructions and carry out operations associated with portable electronic devices as described herein. Using instructions (which may be retrieved from device memory), a controller may regulate the reception and manipulation of input and output data between components of the electronic device.
  • the controller may be implemented in a computer chip or chips. Various architectures can be used for the controller such as microprocessors, application specific integrated circuits (ASICs) and so forth.
  • the controller together with an operating system, may execute computer code and manipulate data.
  • the operating system may be a well-known system such as iOS, Windows, UNIX or a special purpose operating system or other systems as are known in the art.
  • the controller may include memory capability to store the operating system and data.
  • the controller may also include application software to implement various functions associated with the portable electronic device.
  • Electronic device 13 includes a housing 14 to enclose electronic, mechanical and structural components of electronic device 13 .
  • housing 15 may enclose electronic components of charging device 12 .
  • electronic device 13 may have a larger lateral cross section than that of the charging device 12 , although such a configuration is not required.
  • charging device 12 may have a larger lateral cross section than that of the receiver device.
  • the cross sections of the charging device and the receiving device may be substantially the same.
  • charging device 12 can be adapted to be inserted into a charging port (not shown) in the receiving device.
  • charging device 12 may be connected to a power source by a cord or connector 16 .
  • charging device 12 can receive power from a wall outlet, or from another electronic device through a connector, such as a USB connector. Additionally or alternatively, charging device 12 may be battery operated.
  • connector 16 may be electromagnetically connected by any suitable means.
  • Connector 16 may be removable and may include a connector that is sized to fit within an aperture or receptacle opening within housing 15 of charger device 12 .
  • Electronic device 13 may include a first interface surface 17 that may interface with, align or otherwise contact a second interface surface 18 of charging device 12 . While shown as substantially rounded (e.g., convex and concave, respectively), interfaces 17 , 18 may be rectangular, triangular, or have any other suitable shape in three dimensions or in cross-section. In some embodiments the shape of the interface surfaces 17 , 18 may facilitate alignment of the electronic device 13 and charging device 12 .
  • the second interface surface 18 of charging device 12 may be configured to have a particular shape that mates with a complementary shape of electronic device 13 as shown in FIG. 2 .
  • second interface surface 18 may include a concave shape that follows a selected curve of first interface surface 17 . That is, first interface surface 17 of electronic device 13 may include a convex shape following the same or substantially similar curve as the concave shape of the second interface surface 18 .
  • Charging device 12 and electronic device 13 can be positioned with respect to each other using one or more alignment mechanisms, as shown in FIG. 3 .
  • one or more magnetic devices 60 , 61 may be included in charging device 12 and/or electronic device 13 and used to align the devices.
  • one or more actuators in the charging device 12 and/or electronic device 13 can be used to move one or both the devices with respect to one another to facilitate alignment.
  • alignment features such as protrusions and corresponding indentations in the housings 14 , 15 of the charging device 12 and/or electronic device 13 , may be used to align the charging device 12 and/or electronic device 13 .
  • FIG. 3 depicts a side cross-sectional view of the inductive energy transfer system taken along line 3 - 3 in FIG. 2 .
  • both charging device 12 and electronic device 13 can include electronic, mechanical, and/or structural components.
  • the illustrated embodiment of FIG. 3 omits many electronic, mechanical, and structural components for ease of illustration.
  • FIG. 3 shows one example inductive energy transfer system in a mated and aligned configuration.
  • Electronic device 13 includes one or more receiver coils 19 having one or more windings.
  • charging device 12 includes one or more transmitter coils 21 having one or more windings.
  • Transmitter coil 21 may transmit energy to receiving coil 19 in electronic device 13 .
  • Receiver coil 19 may receive energy from the charging device 12 and may use the received energy to perform or coordinate one or more functions of the electronic device 13 , and/or to replenish the charge of a battery (not shown) within electronic device 13 .
  • the receiver coil 19 and transmitter coil 21 may have any number of rows, columns, windings, and so on.
  • transmitter and receiver coils can be implemented with any suitable type of inductor and each coil can have any of a number of shapes and dimensions.
  • transmitter coils 21 and receiver coils 19 can have the same number of windings or a different number of windings.
  • the transmitter 19 and receiver 21 coils are surrounded by an enclosure to direct the magnetic flux in a desired direction (e.g., toward the other coil). The enclosures are omitted in FIG. 3 for ease of illustration.
  • FIG. 4 is a schematic diagram illustrating one simplified example of an inductive charging system configuration.
  • a charging device 12 includes power unit and control circuitry 23 .
  • Transmitting coil 21 generates a magnetic field 20 .
  • a mobile device includes a battery pack 10 which includes a battery 25 and associated control circuitry 26 .
  • Receiving coil 19 captures magnetic field 20 from charging device 12 .
  • Receiving coil 19 has an electrical current induced therein when receiving coil 19 is positioned adjacent to transmitting coil 21 and battery charging device 12 is energized.
  • Transmitting coil 21 is energized by applying a current thereto, which creates magnetic flux lines 20 that allow receiving coil 19 to receive voltage when in sufficient proximity to the transmitting coil. Voltage received in receiving coil 19 may induce current therein, which may charge battery 25 after being rectified in control circuitry 26 . As discussed above, charging coil 21 and receiving coil 19 should be in sufficiently close proximity to enable charging coil 21 to induce the electrical current in receiving coil 19 through magnetic flux 20 .
  • Charging device 12 typically includes power input 16 .
  • Charger device 12 typically includes control circuitry 23 , which may be a switching power supply to boost voltage and/or frequency of current on the charger coil 21 .
  • A/C current conducted through coil 21 may create magnetic flux lines 20 that will allow receiving coil in the vicinity to receive voltage and that voltage may induce current in receiving coil 19 .
  • receiving coil 19 may be of sufficient size to accept induced voltage from charging coil 21 at a voltage level and frequency sufficient to allow it to charge a battery 25 and still power other functions of the electronic device.
  • the current induced in receiving coil 19 may be rectified by control circuitry 26 prior to be provided to battery 25 .
  • Coil geometry in inductive charging systems can generate parasitic or unwanted capacitance, as represented by capacitors 24 a and b. These capacitors are shown in phantom because they do not exist in actuality, but represent a parasitic capacitive effect produced by coils 19 and 21 as will be discussed herein.
  • Capacitance is inversely proportional to distance such that a greater separation results in less capacitance so that conductors in close proximity generally may have higher capacitance between them.
  • This stray capacitance is typically small unless the conductors are close together, cover a large area, or both. For example, stray capacitance may exist between the parts of an inductor winding simply because of the conductive wires' proximity to each other. When a potential difference exists across the windings of an inductor, the coils may act like the plates of a capacitor and store charge.
  • parasitic capacitances may be generated by coils 19 and 21 . Further, if the coils are conventionally wound, the parasitic capacitances may be unbalanced. That is, the capacitance represented by capacitor 24 a may be larger than the capacitance represented by capacitor 24 b. This unbalanced capacitance can generate unwanted noise in the receiving device 13 , which may interfere with the operation of various features and functions of portable electronic device 13 such as capacitive touch sensing, biometric sensing, force sensing and other functionalities.
  • parasitic capacitance introduces interference (e.g., noise) in portable electronic device 13 . That is, the parasitic stray capacitance may cause large voltage swings which interfere with the capacitive sensing functions because these functions use ground reference. The stray capacitance may cause a ground differential between the transceiver 12 and receiver 13 portions of the inductive charging function thereby changing the ground reference for the capacitive sensing function.
  • interference e.g., noise
  • FIG. 6 A top view of a conventional wire winding coil 27 for an inductive charging device is shown in FIG. 6 , although the distance between windings of the coil is increased to simplify viewing and comprehension of the figure.
  • a single length of wire 28 is spirally wound in conventional inductive coil 27 such that the radius of each winding of wire 28 increases from center point 30 .
  • lines 34 - 34 and 35 - 35 extend though center point 30 of coil 27 , which generally lies in a plane.
  • a winding is defined as one revolution of wire 28 , beginning and ending at the intersection of a bisecting radius extending from a center point of coil 27 , such as one half of line 34 - 34 of any other line passing through the center of the coil.
  • wire 28 intersects line 34 at a given point on the line.
  • a single coil winding starts at the point of intersection, continues around the coil and through the line 34 , and ends where wire 28 intersects that same line 34 for the third time.
  • Wire 28 has a cross sectional surface dimension 33 taken through a center point of the wire.
  • the length of wire times the half the wire width 33 times 2 pi yields a surface area of the wire, so a longer wire length has a greater surface area.
  • the wire surface area generally is proportional to the capacitance of the wire, so the greater the surface area, the greater the capacitance.
  • the right side 35 of coil 27 When viewed along line 34 - 34 , the right side 35 of coil 27 includes more wire surface area than on left side 36 . This is primarily due to the increased length of the wire in outer winding 37 , as opposed to the smaller corresponding winding of the opposing side. That is, the length of wire 28 in each half of a winding increases as the radial distance from center 30 increases. Similarly, when viewed along line 38 - 38 , lower half 39 of coil 27 contains more wire than upper half 41 and thus the surface area of wire 28 is greater. Such imbalance exists from each half of coil 27 no matter whether along lines 34 - 34 or 35 - 35 or along any other axis bisecting center point 29 .
  • coil 42 one embodiment of a coil 42 is shown in which wire 28 is wound so as to substantially equalize the surface area of wire 28 included on each half of the coil 42 .
  • coil 42 consists of a single length of wire wound in one or more windings to form the coil.
  • wire 28 may be wound such that each winding of the coil is substantially circular and presents substantially the same surface area on each side of a line bisecting the center 29 (when viewed from above, e.g., in the orientation of FIG. 7 ).
  • This equalization of surface area is accomplished by winding wire 28 to pass over or under itself to form the other half of the winding.
  • wire 28 passes over and under itself to form coil 42 with substantially circular and balanced windings.
  • a line 45 drawn through center 30 of coil 42 results in the upper half 46 and lower half 47 of coil 42 containing approximately the same length of wire 28 .
  • the capacitance generated by each half of coil 42 is equalized and parasitic capacitance resulting from imbalance between the halves is substantially eliminated.
  • FIG. 7 includes wire 28 passing over itself at every winding turn (a “crossing”), for ease of manufacture and in other embodiments one or more conventional spiral windings may be interspersed with the circular windings described in this embodiment.
  • only every second, third, fourth, or so on winding may include a crossing. That is, conventional spiral wound windings (for example, as shown in FIG. 6 ) may be alternated or interspersed with the winding shown in FIG. 7 to provide a balanced or near-balanced capacitance.
  • capacitors 24 a and 24 b may also reduce stray capacitance in a coil and thus reduce common mode noise.
  • the capacitance represented by capacitors 24 a and 24 b is substantially equalized in these embodiments thus reducing or eliminating unwanted common mode noise.
  • These embodiments may result in improved manufacturability and a reduction in the size of the resultant coil.
  • coil 42 in FIG. 7 is shown substantially circular it may be any symmetric geometry such as a square provided the surface area of wire 28 on adjacent halves of a winding, when viewed from above, are approximately equal.
  • FIG. 8 a side view of a receiver coil 19 and transceiver coil 21 is shown, again with the distance between adjacent wires exaggerated.
  • two layers of windings may be adjacent as shown in FIG. 8 and there may be parasitic capacitance generated between those windings.
  • coil 19 includes two winding layers 48 and 49 .
  • Transceiver coil 21 also includes two winding layers 50 and 51 .
  • parasitic capacitance may also be generated between layers of a single transmit or receive coil, or between layers of the two coils.
  • any given layer has a higher parasitic capacitance with a nearer coil than it does with a further coil, presuming all characteristics of the layers are equal.
  • a capacitance 24 a between coil layer 48 and layer 50 is typically lower than a capacitance 24 b between coil layer 49 and layer 50 .
  • capacitance may be related to both the surface area of the conductor and the distance between conductors.
  • the single length of wire 28 forming coil 19 alternates in a serpentine fashion within adjacent winding layers 48 and 49 .
  • the same is true for the wire 28 forming winding layers 50 and 51 of transceiver coil 21 .
  • adjacent windings are shown with + and / symbols while the order in which the windings are formed by a wire (e.g., the path of the wire) is shown by the series of arrows. That is, the arrows show the order in which windings are formed by the wire.
  • This alternating winding may substantially or fully balance the capacitance between winding layers 48 and 49 and between layers 50 and 51 to substantially reduce common mode noise between those layers and between all other combinations of layers in the transmit and receive coils. The same is true for embodiments having more or fewer layers and more or fewer windings.
  • wire 28 may form windings in a stair-step pattern alternating between layers, and then between adjacent windings.
  • the wire may alternate vertically from adjacent coil layer 50 to coil layer 51 , then horizontally in layer 51 between adjacent windings, then back horizontally to layer 50 . This pattern may also help in balancing capacitance between layers and/or coils.
  • windings of continuous length of wire 28 alternate in each half winding such that the length of wire in each winding is approximately equal on each half of a winding.
  • the winding embodiment of FIG. 7 may be combined with the winding embodiments of FIG. 8 for coils containing multiple winding layers such as 48 / 49 and 50 / 51 shown in FIG. 8 .
  • stray capacitance is reduced or eliminated because capacitance within and between coils is balanced or near-balanced, thereby substantially eliminating parasitic capacitances 24 a, 24 b.
  • step 54 a rotating mandrel is utilized.
  • An electrically conductive wire length is wrapped on the mandrel in step 55 .
  • This wrapping may include wrapping the continuous wire length such that in each half winding the wire passes over itself to form substantially circular windings as described with respect to FIG. 7 .
  • step 56 the wire is translated in conjunction with the step of wrapping to alternate the continuous wire length in alternate windings for a multiple winding layer coil.
  • the embodiments described with respect to both FIGS. 7 and 8 may be achieved. That is the continuous length of wire 28 may be translated over or under itself within a winding as described with respect to FIG.
  • step 55 or step 56 can be eliminated to form a coil winding in accordance with either embodiment of FIG. 7 or FIG. 8 . That is, if step 55 is eliminated, then a multiple winding layer coil may be produced but the continuous wire length is not alternated in each half winding as described with respect to FIG. 7 . If step 56 is eliminated, then a single winding layer coil may be produced with the continuous wire length alternating in each half winding. In any of the above embodiments, in step 57 the wrapped wire is formed into an inductive coil structure to be incorporated into a portable electronic device.
  • transceiver coil 21 and receiver coil 19 have been described as in a generally circular shape, it should be expressly understood that embodiments disclosed herein may be employed with coils of other geometric shapes. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
US14/840,842 2014-09-02 2015-08-31 Capacitively balanced inductive charging coil Abandoned US20160064137A1 (en)

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US14/840,842 US20160064137A1 (en) 2014-09-02 2015-08-31 Capacitively balanced inductive charging coil
US15/664,154 US10998121B2 (en) 2014-09-02 2017-07-31 Capacitively balanced inductive charging coil

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US201462044957P 2014-09-02 2014-09-02
US14/840,842 US20160064137A1 (en) 2014-09-02 2015-08-31 Capacitively balanced inductive charging coil

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JP (1) JP3212150U (zh)
KR (1) KR200490687Y1 (zh)
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EP3391917A1 (de) * 2017-04-21 2018-10-24 Berlin Heart GmbH Einrichtung zum steuern einer implantierbaren herzpumpe und herzpumpeneinrichtung
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TWI631582B (zh) 2018-08-01
US10998121B2 (en) 2021-05-04
JP3212150U (ja) 2017-08-31
KR20170001383U (ko) 2017-04-17
US20170338029A1 (en) 2017-11-23
DE212015000212U1 (de) 2017-04-12
TW201619986A (zh) 2016-06-01
CN207884624U (zh) 2018-09-18
WO2016036758A1 (en) 2016-03-10

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