Wireless charging transmitter and method

Abstract

A wireless charging transmission apparatus is described herein that is configured to effect wireless charging of a portable electronic device from a wireless charger across a gap. The apparatus includes a coil structure that includes a receiver coil, a transmitter coil, and a bridge that electrically connects the receiver coil and the transmitter coil across the gap. The coil structure can be received within a housing that can provide storage space or that can incorporate an extendable grip accessory.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Provisional Application No. 62 / 959,471, filed January 10, 2020, the entire disclosure of which is incorporated herein by reference.

[0002] The present disclosure relates generally to chargers for electronic devices, and more particularly to wireless chargers for portable electronic devices. [Background technology]

[0003] Wireless charging of portable electronic devices such as smartphones is becoming increasingly popular. In use, the electronic device is placed on a charging station and an electromagnetic field transfers power from the charging station to the electronic device via electromagnetic induction or resonance. The power is then used by the electronic device to charge its battery. Many factors affect the efficiency of power transfer, including the materials and space between the coils of the charging station and the electronic device.

[0004] Portable electronic devices can also be housed in protective covers or cases to protect the device from damage, provide a grip for handling the device, and / or provide a stand to support the device on a surface. In such cases, the effective size of the device is increased. Additionally, expandable devices and accessories that can be attached directly to the device or the case that protects the device are used for a variety of functions including supporting the device on a surface and providing an expandable grip for handling the device. Expandable devices have decorative buttons that can display logos, decals, symbols, or other artistic renderings. However, all of these covers, cases, devices, and accessories can increase the material and space between the charging station and the coil of the electronic device. Summary of the Invention [Means for solving the problem]

[0005] A wireless power transmitter is described herein and configured to transfer power from a transmitter coil for charging to a receiving coil in a portable electronic device. The wireless power transmitter includes a receiver coil, a transmitter coil, a bridge electrically connecting the receiver and transmitter coils across a gap therebetween and transferring power received at the receiver coil to the transmitter coil, and a housing having an upper portion for receiving the receiver coil and a lower portion for receiving the transmitter coil.

[0006] According to one or more embodiments, the bridge may be an electrical pathway extending between edges of the receiver and transmitter coils, and / or the housing may include a coupling extending between the upper and lower portions and receiving the bridge therethrough, and a storage area disposed between the upper and lower portions, the storage area having an opening for access thereto. In one or more embodiments, the wireless power transmitter may include a retainer extending within the storage area and retaining contents inserted within the storage area; the wireless power transmitter may include a shield extending along the upper and lower portions and / or the coupling to shield the storage area; and / or the storage area may include a plurality of side walls extending between the upper and lower portions, and the opening is a lateral opening.

[0007] According to one or more embodiments, the bridge can be a connector coil having a helical configuration that is selectively expandable in an axial direction. In one or more embodiments, the connector coil can be electrically connectable to the transmitter coil at a radially outer portion thereof and to the receiver coil at a substantially central portion thereof, and / or the housing can include an expandable sidewall extending between upper and lower housing portions, the connector coil being disposed within the expandable sidewall. The expandable sidewall can have a frusto-conical configuration, and / or the upper portion of the housing can be a button mounted to an end of the expandable sidewall.

[0008] According to any of the above aspects, the receiver coil can be embedded in an upper portion of the housing and the transmitter coil can be embedded in a lower portion of the housing; and / or the lower portion of the housing can include one or more walls configured to engage the portable computing device and couple the housing to the portable computing device.

[0009] According to another aspect of the present disclosure, a method for transmitting charging power from a transmitting coil of a wireless power source to a receiving coil of a portable electronic device in use is described, the method including: receiving power from the transmitting coil with a receiver coil of a wireless power transmission apparatus; transmitting the power to the transmitter coil of the wireless power transmission apparatus via a bridge across a gap between the receiver coil and the transmitter coil; and transmitting the power to the receiving coil of the portable electronic device with the transmitter coil of the wireless power transmission apparatus. In this form, the receiver coil is disposed within an upper portion of a housing of the wireless power transmission apparatus, and the transmitter coil is disposed within a lower portion of the housing.

[0010] According to one or more aspects, transferring power to a transmitter coil of a wireless power transmission device via a bridge across a gap between the receiver coil and the transmitter coil may include transferring power to the transmitter coil of the wireless power transmission device via an electrical path extending between edges of the receiver coil and the transmitter coil. In one or more aspects, the method may include receiving an item in a storage area of ​​the housing disposed between the upper and lower portions, the storage area having an opening for access thereto. In yet another aspect, the method may include shielding the storage area with a shielding member extending along the upper and lower portions.

[0011] According to one or more aspects, transferring power to a transmitter coil of a wireless power transmission device through a bridge spanning a gap between the receiver coil and the transmitter coil can include transferring power to the transmitter coil of the wireless power transmission device through a connector coil having opposite ends electrically connecting the transmitter coil and the receiver coil, the connector coil having a helical structure that is selectively expandable in an axial direction. In one or more aspects, the method can include expanding a sidewall of the housing extending between an upper and lower portion thereof, the connector coil being disposed within the expandable sidewall, and expansion of the sidewall causes expansion of the connector coil in the axial direction.

[0012] According to any aspect above, the method can include coupling a lower portion of the housing to the portable computing device. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of a portable electronic device and a wireless charger.

[0014] [Diagram 2]FIG. 2 is a cross-sectional view of a wireless charging transfer device constructed in accordance with the principles of the present disclosure for charging a portable electronic device across a gap from a wireless charger.

[0015] [Diagram 3] 3 is a perspective view of a coil structure constructed in accordance with the principles of the present disclosure for the wireless charging transmission device of FIG.

[0016] [Figure 4] FIG. 4 is a cross-sectional view of a wireless charging transmission device constructed in accordance with the principles of the present disclosure for charging a portable electronic device across a gap from a wireless charger, with the extendable grip accessory in a folded state.

[0017] [Diagram 5] FIG. 5 is a cross-sectional view of a wireless charging transmission device with an extendable grip accessory in an extended state.

[0018] [Figure 6] FIG. 6 is a perspective view of a coil structure constructed in accordance with the principles of the present disclosure for the wireless charging transfer device of FIG.

[0019] [Figure 7] FIG. 7 is a perspective view of a coil structure constructed in accordance with the principles of the present disclosure for the wireless charging transfer device of FIG.

[0020] [Figure 8] FIG. 8 is a cross-sectional view of the wireless charging configuration of FIG.

[0021] [Figure 9] FIG. 9 is an exploded perspective view of the configuration of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Generally, in accordance with various embodiments, a wireless charger and method are provided that advantageously provide stable and efficient portable charging of a portable electronic device across or through a gap, where the device uses intermediate receiver and transmitter coils to act as a bridge, for example, to transfer power from a transmitter coil in a charging station to a receiving coil in the portable electronic device.

[0023] The intermediate receiver and transmitter coils are receivable within a housing that defines a gap that can advantageously be utilized to store credit or debit cards or other typical wallet contents, thereby allowing easy insertion and removal of the contents. In some versions, the housing can include a case on one side thereof to hold and protect the electronic device. In other forms, the gap can be due to an outwardly protruding attachment mounted to the portable electronic device, such as a grip attachment. In some versions, the grip attachment can be an expandable device including a base and an expansion mechanism that is movable relative to the base between a collapsed configuration and an extended configuration. The expandable device can further include a button coupled to the expansion mechanism.

[0024] As shown in FIG. 1, the wireless charger and methods described herein are configured for charging a suitable portable electronic device 10, such as a smartphone, tablet, e-reader, and the like. The portable electronic device 10 includes electrical components powered by a battery or other suitable power storage 12, and a receiver coil 14 electrically connected to the power source 12. The receiver coil 14 has a disk-shaped structure and has a major surface 16 that extends in a generally parallel direction with respect to a major surface 18 of the device 10. As such configured, the portable electronic device 10 can receive charging power from a wireless charger 20 that has a transmitter coil 22 and is electrically connected to a power source 24. In this configuration, a user can align the receiver coil 14 of the portable electronic device 10 with the transmitter coil 22 of the wireless charger 20 to charge the power source 12 via inductive power provided by the transmitter coil 22 and received by the receiver coil 14. However, as discussed above, the coils 14, 22 must be well aligned and within a relatively close distance to each other. Thus, when the portable electronic device 10 is separated from the wireless charger 20 by the gap 26, the portable electronic device 10 may not be fully charged.

[0025] A wireless charging transmission device 100 suitable for wirelessly providing charging power to a portable electronic device 10 across the gap 26 is shown in Figures 2-7. The device 100 described herein includes receiver and transmitter coils 102, 104 electrically connected together by a bridge 106 extending therebetween. The receiver coil 102, the transmitter coil 104, and the bridge 106 are received within a housing 108 of the device 100. In the illustrated form, the housing 108 includes a lower portion 110 sized to receive the receiver coil 102, an upper portion 112 sized to receive the transmitter coil 104, and a coupling portion 114 extending between the lower and upper portions 110, 112. The coupling portion 114 spans the gap 26 and receives the bridge 106 therein, allowing the bridge 106 to electrically connect the coils 102, 104 together. The lower and upper portions 110, 112 can have the coils 102, 104 embedded therein or can include a cavity sized to receive the coils 102, 104. By virtue of the intermediate coils 102, 104 and bridge 106, the device 100 described herein allows the power source 12 of the portable computing device 10 to be charged by the wireless charger 20 despite the gap 26 therebetween. Accordingly, the lower housing portion 110 is configured to be placed on the wireless charger 20, aligning the receiver coil 102 with the transmitter coil 22 of the wireless charger 20. Similarly, the upper housing portion 112 is configured to receive or couple the portable electronic device 10 thereon, aligning the transmitter coil 104 with the receiver coil 14 of the device 10. For example, the coils described herein can be configured to operate in the Qi standard. Other suitable standards can alternatively be used. In the illustrated form, the lower housing portion 110 includes a generally flat exterior portion 111 allowing the housing 108 to be stably placed on the wireless charger 20. The upper housing portion 112 can include a similarly flat exterior portion 113 for receiving the device 10 thereon.

[0026] 2 and 3, the bridge 106 can be an electrical pathway 116 connecting the radial edges 118, 120 of the receiver and transmitter coils 102, 104, respectively. In this configuration, the gap 26 at least partially defines a storage area 122 disposed between the lower and upper portions 110, 112 of the housing 108. In the illustrated form, the storage area 122 is bounded by upper and lower walls 124, 126 and a rear wall 128 and is accessible via an opening 130. As illustrated, the upper and lower walls 124, 126 are part of the upper and lower portions 112, 110 of the housing 108, and the rear wall 130 is part of the connecting portion 114 of the housing 108. Advantageously, the storage area 122 allows a user to insert cards, excess grip accessories, tablet tops, battery modules, circuit boards, cases, stands, or other items into the housing 108 via the opening 130. If desired, the housing 108 can further include a shield 131 to shield the storage 122 from electromagnetic fields generated by the receiver and / or transmitter coils 102, 104. As such, the shield 131 can extend along or within the lower portion 110, the upper portion 112, and / or the coupling portion 114. The shield 131 can be a separate or attached member. In one example, the shield 131 can include ferrite and can have a hard or soft aspect as desired.

[0027] In some configurations, portions of the housing 108 may be made of a flexible material. For example, the connecting portion 114 may be flexible, allowing the lower and upper portions 110, 112 to pivot relative to one another. In this configuration, the housing 108 may provide a storage area 122 that functions similarly to a bi-fold wallet. In this regard, the upper and / or lower walls 124, 126 may have one or more pockets 132 formed therein or coupled thereto to provide convenient storage locations within the storage area 122. Alternatively, the connecting portion 114 may be made of a rigid material, and the lower and upper portions 110, 112 may be fixed in place relative to one another. In the illustrated configurations, the lower and upper portions 110, 112 extend generally parallel to one another. In these configurations, the storage area 122 may be further defined by a side wall 134 that extends between the lower and upper portions 110, 112 and connects to the rear wall 128. When so configured, the opening 130 is a lateral opening providing access to the storage area 122. Moreover, the shield 131 may also extend along or within the sidewall 134, and in some forms, the storage area 122 is completely enclosed by the shield 131 except for the opening 130. If desired, the upper and / or lower walls 124, 126 may include an inwardly extending retaining portion 135 configured to grip contents inserted within the storage area 122. For example, the retaining portion 135 may be made of a rubber or viscous plastic material.

[0028] As mentioned above, the coils 102, 104 may be embedded in the lower and upper portions 110, 112 or received in cavities formed therein. Alternatively, in this configuration, the coils 102, 104 may be disposed on an exterior or interior surface of the lower and upper portions 110, 112 relative to the storage area 122. For example, the coils 102, 104 may be glued to a surface or otherwise bonded thereto. Suitable materials for the housing 108 include polycarbonate, high density polyethylene (HDPE), nylon, thermoplastic polyurethane (TPU) rubber, and other suitable polymers.

[0029] Advantageously, the lower portion 110 of the housing 108 may include one or more walls 136 sized and configured to engage the portable computing device 10 to couple the housing 10 thereto. For example, the walls 136 may be configured to engage the sides and / or front of the device 10 to secure the housing 108 thereto. For example, the walls 136 may be inclined inwardly and / or provided with lips that engage the device 10, and may have a resilient and / or flexible configuration for mounting the housing 108 to the device 10, as is well understood. Although the housing 108 is illustrated in a stand-alone configuration, the walls defining the storage area 122 may be removably attached to the walls for coupling the housing 108 to the portable electronic device 10. This allows a user to remove the storage area 122 from its attached state to the portable electronic device 10 for convenient wallet-like access to the storage area 122.

[0030] In this configuration, the top 112 extends along and above the device 10 to align the transmitter coil 104 with the receiver coil 14 of the device 10. The housing 108 can be used to protect the portable electronic device 10 from physical damage. So configured, the housing 108 can function as both a protective case for the portable computing device 10 and a wallet or other storage. Additionally, by virtue of the coils 102, 104 and bridge 106, the portable computing device 10 can be charged when the device 10 and housing 108 are positioned on the wireless charger 20 as well as when the device 10 is positioned directly above the wireless charger 20.

[0031] As shown in FIGS. 4-7, the bridge 106 can be a coil member 150 having a helical shape to have a generally flat configuration in a first state. In this configuration, the helical coil can be moved axially to an expanded state. For example, as shown in FIG. 5, a central end 152 of the coil member 150 can be moved axially relative to a radial end 154 of the coil member 150 such that the coil member 150 has a conical shape in the expanded state. The expansion of the coil member 150 can move the receiver and transmitter coils 102, 104 axially away from each other while maintaining an electrical connection therebetween. In one version, the central end 152 is electrically connected to a center portion 156 of the receiver coil 102 and the radial end 154 is electrically connected to a radial edge 158 of the transmitter coil 104 as shown in FIG. 7. In another version, a connector 160 can electrically connect the central end 152 to a radial edge 162 of the receiver coil 102 as shown in FIG. 6.

[0032] As shown in FIGS. 4 and 5, the housing 108 includes a grip attachment 164 having an expandable sidewall 166 as a connector 114, extending between a button 168 forming the upper portion 112 and the lower portion 110. The sidewall 166 is transitionable between an expanded use configuration and a folded storage configuration having an accordion-like structure. The sidewall 166 can be made of a flexible material such as a polyester-based thermoplastic polyurethane elastomer and can be formed by injection molding, thermoforming, or compression molding, or can be made of any equivalent functional material suitable for its intended purpose. As shown, the bridge 106 is received within the sidewall 166, and the coil member 150 expands when the user expands the sidewall 166. The expandable sidewall 166 can have a truncated cone shape in the expanded state as shown in FIG. 5. Of course, other shapes such as a cylinder, box, or other polygonal cross-sections can be used.

[0033] In some versions, the lower portion 110 can be a platform 170 coupled to a sidewall 166 adapted for mounting to the portable electronic device 10 or a case or other structure mounted to the device 10. The platform 170 can be secured, for example, with a suitable adhesive. In this configuration, a user can secure the platform 170 to the portable electronic device 10 or case such that the transmitter coil 104 is aligned with the receiver coil 14 within the device.

[0034] In another version, the lower portion 110 can be a case 172 having a main wall 174 and one or more side walls 176 extending outwardly from an edge of the main wall 174. The side walls 176 are configured to engage the sides and / or front of the device 10 to secure the case 172 thereto. For example, the side walls 176 can be inwardly angled and / or provided with a lip that engages the device 10, and can have a resilient and / or flexible configuration for mounting the housing 108 to the device 10, as is well understood. In this configuration, the main wall 174 extends along and over the device 10 to align the transmitter coil 104 with the receiver coil 14 of the device 10. The case 164 can also be used to protect the portable electronic device 10 from physical damage.

[0035] The various components of the housing 108 in this configuration are removably attachable to one another. For example, the button 168 and the platform 170 or case 172 may include contacts and the sidewall 166 may include corresponding contacts, such that when the sidewall 166 is attached to the button 168 and the platform 170 or case 172, the coil member 150 is electrically connected to each of the transmitter coil 104 and the receiver coil 102.

[0036] In the configuration presented herein, placing the wireless charging transmission device 100 between the wireless charger 20 and the portable electronic device 10 places the coil 14 of the electronic device 10 within the charging zone of the transmission coil 124 .

[0037] FIG. 8 illustrates a cross-sectional view of the wireless charging configuration of FIG. 2, and FIG. 9 illustrates an exploded perspective view of the configuration of FIG. 8. With reference to FIGS. 8 and 9, a charge-through-wallet 200 includes a wallet shell 202 forming a content area 204 (e.g., for holding credit cards, etc., with magnetic / RFID, etc.). Coils 206, 208 on a flexible circuit board may be formed with ferrite or a suitable signal protective backing and connected via connection traces 210 on the flexible circuit board. With this configuration, a mobile electronic device 214, with or without an optional mobile electronic device case 212, may be charged (e.g., by induction or resonance) by a wireless charging pad coil 218 of a wireless charging pad 216 even when the wallet is attached to the mobile electronic device 214 as shown in FIG.

[0038] In some cases, the expandable grip accessories of the present disclosure may be in the form of commercially available grip and stand products, such as those manufactured and sold by PopSockets, LLC, see, for example, U.S. Patent No. 8,560,031, filed February 23, 2012; U.S. Patent No. 9,970,589, filed November 9, 2017; U.S. Patent No. 10,019,034, filed December 31, 2014; U.S. Patent No. 10,054,259, filed June 7, 2017; U.S. Patent No. 10,030,807, filed March 15, 2018; U.S. Patent Application No. 15 / 679,934, filed August 17, 2017; U.S. Patent Application No. 15 / 729,260, filed October 10, 2017; U.S. Patent Application No. 10 / ... No. 15 / 803,410, filed Nov. 9, 2017; U.S. Ser. No. 15 / 808,076, filed Nov. 9, 2017; U.S. Ser. No. 15 / 906,920, filed Feb. 27, 2018; U.S. Ser. No. 15 / 952,025, filed Apr. 12, 2018; U.S. Ser. No. 15 / 993,458, filed May 30, 2018; and U.S. Ser. No. 16 / 001,723, filed Jun. 6, 2018, each describe suitable extendable grip and stand products that also incorporate foldable mechanisms, and each is incorporated by reference in its entirety herein.

[0039] It is understood that elements in the figures are illustrated for simplicity and clarity and are not necessarily drawn to scale. For example, the size and / or relative location of some elements in the figures may be exaggerated relative to other elements to help improve understanding of the various embodiments of the present invention. Also, common but well-known elements that may be used or required in commercially viable embodiments are often not shown so as not to distract from the illustration of these various embodiments. The same reference numbers may be used to describe similar or like parts. Furthermore, although several examples are disclosed herein, any feature from any example may be combined with or substituted for other features from other examples. Furthermore, although several examples are disclosed herein, changes may be made to the disclosed examples without departing from the scope of the claims.

[0040] Those skilled in the art will appreciate that a wide range of modifications, variations and combinations are possible with respect to the above-described embodiments without departing from the scope of the present invention, and such modifications, variations and combinations are deemed to be within the scope of the inventive concept.

Claims

1. 1. A wireless power transmitter for transmitting power from a transmitter coil for charging to a receiver coil in a portable electronic device, comprising: Receiver coil; Transmitter coil; a bridge electrically connecting the receiver coil and the transmitter coil across a gap therebetween and transmitting power received by the receiver coil to the transmitter coil; and a housing having an upper portion for receiving the receiver coil and a lower portion for receiving the transmitter coil; The housing includes a coupling portion extending between the upper and lower portions and receiving the bridge therethrough, and a storage area disposed between the upper and lower portions, the storage area having an opening for access thereto.

2. The wireless power transmitter of claim 1 , wherein the bridge comprises an electrical path extending between edges of the receiver coil and the transmitter coil.

3. The wireless power transmitter of claim 1 , further comprising a retaining portion extending within the storage area and retaining contents inserted within the storage area.

4. The wireless power transmitter of claim 1 , further comprising a shield extending along the top and bottom portions and the coupling portion to shield the storage area.

5. the storage area further comprises a plurality of side walls extending between the upper and lower portions; The wireless power transmitter of claim 1 , wherein the opening comprises a lateral opening.

6. A wireless power transmitter for transmitting power from a transmitter coil for charging to a receiving coil in a portable electronic device, comprising: Receiver coil; Transmitter coil; a bridge electrically connecting the receiver coil and the transmitter coil across a gap therebetween and transmitting power received by the receiver coil to the transmitter coil; and a housing having an upper portion for receiving the receiver coil and a lower portion for receiving the transmitter coil; The bridge includes a connector coil having a helical structure that is selectively expandable in an axial direction.

7. The wireless power transmitter of claim 6 , wherein the connector coil is electrically connected to the transmitter coil at a radially outer portion thereof and electrically connected to the receiver coil at a substantially central portion thereof.

8. 8. The wireless power transmitter of claim 7, wherein the housing further includes an expandable sidewall extending between upper and lower housing portions, the connector coil being disposed within the expandable sidewall.

9. The wireless power transmitter of claim 8 , wherein the expandable sidewall has a frusto-conical form.

10. The wireless power transmitter of claim 8 , wherein the top portion of the housing comprises a button mounted to an end of the expandable sidewall.

11. 10. The wireless power transmitter of claim 1, wherein the lower portion of the housing further comprises one or more walls configured to engage a portable computing device and couple the housing to the portable computing device.

12. The wireless power transmitter of claim 1 , wherein the receiver coil is embedded in the upper portion of the housing and the transmitter coil is embedded in the lower portion of the housing.

13. The wireless power transmitter of claim 1 , wherein the wireless power transmitter comprises an inductive power transmitter.

14. 1. A method for transmitting charging power from a transmitting coil of a power source to a receiving coil of a portable electronic device in use, the method comprising: a receiver coil of a wireless power transmission device receiving power from the power transmitting coil, the receiver coil being disposed within an upper portion of a housing of the wireless power transmission device; transmitting the power to the transmitter coil of the wireless power transmission device via a bridge across a gap between the receiver coil and a transmitter coil, the transmitter coil being disposed within a lower portion of the housing; Transmitting the power from the transmitter coil of the wireless power transmission apparatus to the receiving coil of the portable electronic device; and receiving items in a storage area of ​​the housing disposed between the upper and lower portions; The method wherein the storage area has an opening for access thereto.

15. 15. The method of claim 14, wherein transferring the power to the transmitter coil of the wireless power transmission device through a bridge across a gap between the receiver coil and the transmitter coil comprises transferring the power to the transmitter coil of the wireless power transmission device through an electrical path that extends between edges of the receiver coil and the transmitter coil.

16. The method of claim 14 , further comprising shielding the storage area with a shield member extending along the top and bottom portions.

17. A method for transmitting charging power from a transmitting coil of a power source to a receiving coil of a portable electronic device in use, the method comprising: a receiver coil of a wireless power transmission device receiving power from the power transmitting coil, the receiver coil being disposed within an upper portion of a housing of the wireless power transmission device; The power is transmitted to the transmitter coil of the wireless power transmission device through a bridge across a gap between the receiver coil and the transmitter coil, the transmitter coil being disposed within a lower portion of the housing; and transmitting the power from the transmitter coil of the wireless power transmission apparatus to the receiving coil of the portable electronic device; A method according to claim 1, wherein transmitting the power to the transmitter coil of the wireless power transmission device via a bridge spanning a gap between the receiver coil and the transmitter coil includes transmitting the power to the transmitter coil of the wireless power transmission device via a connector coil having opposite ends electrically connecting the transmitter coil and the receiver coil, the connector coil having a helical structure that is selectively expandable in an axial direction.

18. 18. The method of claim 17, further comprising expanding a sidewall of the housing extending between the upper and lower portions thereof, the connector coil being disposed within the expandable sidewall, the expansion of the sidewall causing the connector coil to expand in the axial direction.

19. The method of claim 14 , further comprising coupling the lower portion of the housing to a portable computing device.

20. The method of claim 14 , wherein the wireless power transfer device comprises an inductive power transfer device.

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