Patent Publication Number: US-9413087-B2

Title: Data and power connector

Description:
BACKGROUND 
     Portable devices are often powered by rechargeable batteries. While some portable devices include rechargeable batteries that may be removed and charged externally to the device, other portable devices include a port to accept a power connector of a recharging cable and/or device. The port may also be configured to accept data signals from the recharging cable and/or device. For example, the recharging cable and/or device may also connect to a computing device and transmit data between the portable device and the computing device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS. 1A and 1B  show an exemplary wearable electronic device. 
         FIG. 2  shows the example power and data port of the wearable electronic device of  FIG. 1B . 
         FIG. 3  shows an exemplary power and data connector. 
         FIGS. 4A-4D  show an exemplary power and data connector head. 
         FIG. 5  shows an example schematic of electrical connections of an example power and data connector. 
         FIG. 6  shows an interior front view of an example power and data connector. 
         FIG. 7  shows a detail view of example electrical connectors of an example power and data connector. 
         FIGS. 8A and 8B  show different views of an exemplary wearable charging device. 
         FIG. 9  schematically shows an example computing device. 
     
    
    
     DETAILED DESCRIPTION 
     Power and data connectors may couple to an associated port in a number of ways. For example, snap-fit or other mechanical arrangements may be used to provide a structural connection that resists disconnection and allows tactile feedback to confirm a secure connection. However, some purely snap-fit arrangements may require structure and mechanisms that are unsightly, overly complex, high maintenance (e.g., difficult to keep free of debris), and/or uncomfortable to a user when disposed on portable devices such as wearable devices. Magnetic arrangements may help guide a power and data connector toward an associated port to assist with alignment of the connector without the need for precise visually-aided guidance. 
     According to one embodiment, a power and data connector includes a magnet, a film adhered to a surface of the magnet, and a stage extending away from the film. The power and data connector further comprises a plurality of electrical contacts disposed on the stage, the plurality of electrical contacts having a mirrored signal pin-out. 
     A power and data connector may utilize a magnetically attractive surface and a protruding stage configured to fit into a corresponding well of a power and data port. In this way, the power and data connector may mitigate the aesthetic and operational deficiencies of some mechanical arrangements while still providing tactile feedback of a successful connection. For example, the amount of protrusion of the stage (and consequently the amount of depression of an associated well of a power and data port) may be reduced relative to a purely mechanical arrangement, as the magnetically attractive surface may assist in providing a secure coupling. The magnetically attractive surface (e.g., a magnetically attractive surface of the magnetically attractive elements) may be unhoused, so as to lessen a connected distance between the surface and a corresponding surface of the port. The power and data connector may also include a mirrored pin-out, enabling orientation-agnostic mating of the connector to the associated port. While described below in the context of a portable wearable electronic device, the examples of the power and data connector of this disclosure may be implemented with different types of sensor and logic systems. 
       FIGS. 1A and 1B  show aspects of an example sensory-and-logic system in the form of a wearable electronic device  10 . The illustrated device is band-shaped and may be worn around a wrist. Device  10  includes at least four flexion regions  12  linking less flexible regions  14 . The flexion regions of device  10  may be elastomeric in some examples. Fastening componentry  16 A and  16 B is arranged at both ends of the device. The flexion regions and fastening componentry enable the device to be closed into a loop and to be worn on a user&#39;s wrist. In other implementations, wearable electronic devices of a more elongate band shape may be worn around the user&#39;s bicep, waist, chest, ankle, leg, head, or other body part. The device, for example, may take the form of eye glasses, a head band, an arm-band, an ankle band, a chest strap, or an implantable device to be implanted in tissue. 
     Wearable electronic device  10  includes various functional components integrated into regions  14 . In particular, the electronic device includes a compute system  18 , display  20 , loudspeaker  22 , communication suite  24 , and various sensors. These components draw power from one or more energy-storage cells  26 . A battery—e.g., a lithium ion battery—is one type of energy-storage cell suitable for this purpose. Examples of alternative energy-storage cells include super- and ultra-capacitors. In devices worn on the user&#39;s wrist, the energy-storage cells may be curved to fit the wrist, as shown in the drawings. 
     In general, energy-storage cells  26  may be replaceable and/or rechargeable. In some examples, recharge power may be provided through a power and data port, such as universal serial bus (USB) port  30 , which includes a magnetic latch to releasably secure a complementary USB connector. In other examples, the energy storage cells may be recharged by wireless inductive or ambient-light charging. In still other examples, the wearable electronic device may include electro-mechanical componentry to recharge the energy storage cells from the user&#39;s adventitious or purposeful body motion. For example, batteries or capacitors may be charged via an electromechanical generator integrated into device  10 . The generator may be turned by a mechanical armature that turns while the user is moving and wearing device  10 . 
     In wearable electronic device  10 , compute system  18  is situated below display  20  and operatively coupled to the display, along with loudspeaker  22 , communication suite  24 , and the various sensors. The compute system includes a data-storage machine  27  to hold data and instructions, and a logic machine  28  to execute the instructions. Aspects of the compute system are described in further detail with reference to  FIG. 9 . 
     Display  20  may be any suitable type of display. In some configurations, a thin, low-power light emitting diode (LED) array or a liquid-crystal display (LCD) array may be used. An LCD array may be backlit in some implementations. In other implementations, a reflective LCD array (e.g., a liquid crystal on silicon, LCOS array) may be frontlit via ambient light. A curved display may also be used. Further, AMOLED displays or quantum dot displays may be used. 
     Communication suite  24  may include any appropriate wired or wireless communications componentry. In  FIGS. 1A and 1B , the communications suite includes USB port  30 , which may be used for exchanging data between wearable electronic device  10  and other computer systems, as well as providing recharge power. The communication suite may further include two-way Bluetooth, Wi-Fi, cellular, near-field communication and/or other radios. In some implementations, the communication suite may include an additional transceiver for optical, line-of-sight (e.g., infrared) communication. 
     In wearable electronic device  10 , touch-screen sensor  32  is coupled to display  20  and configured to receive touch input from the user. The touch sensor may be resistive, capacitive, or optically based. Pushbutton sensors may be used to detect the state of push buttons  34 , which may include rockers. Input from the pushbutton sensors may be used to enact a home-key or on-off feature, control audio volume, turn the microphone on or off, etc. 
       FIGS. 1A and 1B  show various other sensors of wearable electronic device  10 . Such sensors include microphone  36 , visible-light sensor  38 , ultraviolet sensor  40 , and ambient temperature sensor  42 . The microphone provides input to compute system  18  that may be used to measure the ambient sound level or receive voice commands from the wearer. Input from the visible-light sensor, ultraviolet sensor, and ambient temperature sensor may be used to assess aspects of the wearer&#39;s environment—e.g., the temperature, overall lighting level, whether the wearer is indoors or outdoors, etc. 
       FIGS. 1A and 1B  show a pair of contact sensor modules  44 A and  44 B, which contact the wearer&#39;s skin when wearable electronic device  10  is worn. The contact sensor modules may include independent or cooperating sensor elements, to provide a plurality of sensory functions. For example, the contact sensor modules may provide an electrical resistance and/or capacitance sensory function, which measures the electrical resistance and/or capacitance of the wearer&#39;s skin. Compute system  18  may use such input to assess whether or not the device is being worn, for instance. In some implementations, the sensory function may be used to determine how tightly the wearable electronic device is being worn. In the illustrated configuration, the separation between the two contact-sensor modules provides a relatively long electrical path length, for more accurate measurement of skin resistance. In some examples, a contact sensor module may also provide measurement of the wearer&#39;s skin temperature. Arranged inside contact sensor module  44 B in the illustrated configuration is an optical pulse rate sensor  46 . The optical pulse-rate sensor may include an LED emitter and matched photodiode to detect blood flow through the capillaries in the skin and thereby provide a measurement of the wearer&#39;s pulse rate. 
     Wearable electronic device  10  may also include motion sensing componentry, such as an accelerometer  48 , gyroscope  50 , and magnetometer  51 . The accelerometer and gyroscope may furnish inertial and/or rotation rate data along three orthogonal axes as well as rotational data about the three axes, for a combined six degrees of freedom. This sensory data can be used to provide a pedometer/calorie-counting function, for example. Data from the accelerometer and gyroscope may be combined with geomagnetic data from the magnetometer to further define the inertial and rotational data in terms of geographic orientation. The wearable electronic device may also include a global positioning system (GPS) receiver  52  for determining the wearer&#39;s geographic location and/or velocity. In some configurations, the antenna of the GPS receiver may be relatively flexible and extend into flexion regions  12 . 
     Compute system  18 , via the sensory functions described herein, is configured to acquire various forms of information about the wearer of wearable electronic device  10 . When such information is acquired, the information is acquired and used with utmost respect for the wearer&#39;s privacy. Accordingly, the sensory functions may be enacted subject to opt-in participation of the wearer. In implementations where personal data is collected on the device and transmitted to a remote system for processing, that data may be anonymized. In other examples, personal data may be confined to the wearable electronic device, and only non-personal, summary data transmitted to the remote system. 
       FIG. 2  shows a detailed view of USB port  30  of  FIG. 1B . USB port  30  may include a metal frame  202  surrounding a well  204 . Metal frame  202  may be constructed from any suitable metal or metal alloy, such as aluminum in one example. The outward surface of the metal frame may be finished (e.g., with a satin finish) in order to provide a smooth surface that is comfortable to the skin of a wearer. In some examples, the outward surface may include a plurality of protrusions and/or a rough finish in order to ensure contact with a wearer&#39;s skin and/or to facilitate a connection with a power and data connector. As illustrated, metal frame  202  may be substantially rectangular in shape with rounded corners. In some examples, metal frame  202  may be included in a sensing system, such as a galvanic skin response sensor. In such examples, metal frame  202  may be configured to form an electrical and/or physical connection with human skin. One or more magnets may be housed underneath and/or within metal frame  202  in order to provide a magnetically attractive surface in some examples. In additional or alternative examples, metal frame  202  may be formed of a material (e.g., a metal or metal alloy) that is attractable to magnets. 
     A plurality of charging contact pads  206  may be disposed within the well  204  for connecting to associated electrical contacts of a power and data connector, described in more detail below with respect to  FIGS. 3-7 . Charging contact pads  206  may be formed of an electrically conductive material, such as gold, and disposed on a frame  208  formed from non-electrically conductive material, such as plastic. The non-electrically conductive material may be utilized to isolate the electrical signaling provided to and from each of the charging contact pads  206 . Charging contact pads  206  may be electrically connected to one or more compute systems within the wearable electronic device  10 . For example, a contact pad configured to receive a power signal may be electrically connected to a battery and/or recharging system. A contact pad configured to receive a data signal may be electrically connected to a logic system and/or data-storage system of the wearable electronic device  10 . 
     In the illustrated example, seven charging contact pads are shown. The contact pads may have a mirrored pin-out structure. For example, a leftmost end and rightmost end charging contact pad may be defined as electrical ground. Moving inward from both ends, a next pair of charging contact pads may be configured to receive a positive data signal. Moving further inward, a next pair of charging contact pads may be configured to receive a negative or inverted data signal. A central charging contact pad may be configured to receive a power signal (e.g., from a voltage source of a charging device) to recharge the batteries of the wearable electronic device  10 . Pairs of contact pads configured to receive the same type of signal may be electrically tied together. In this way, the contact pads  206  may be symmetrically aligned with an axis of symmetry that is coaxial to a central axis  210  bisecting just the central contact pad. Metal frame  202  may be configured to be electrical ground, and may be connected to the leftmost end and rightmost end of the charging contact pads. 
     Although seven charging contact pads are illustrated in  FIG. 2 , it is to be understood that the USB port  30  may include any suitable number of charging contact pads. For example, five charging contact pads may be utilized, where a leftmost end and rightmost end contact pad is configured to receive a positive data signal. In such an example, a next pair of charging contact pads moving inward from the leftmost and rightmost ends may be configured to receive a negative or inverted data signal. A center contact pad may be configured to receive a power signal, while a metal ring around the contact pads may be configured to provide a grounded contact. Although described herein as having a USB pin-out, it is to be understood that port  30  may include any suitable arrangement of contact pads and associated electrical connections for communicating using any compatible protocol. 
     Inwardly protruding walls of well  204  may angle inward such that the length and/or width (e.g., the area) of well  204  is smaller at the charger contact pad frame  208  than the length and/or width of well  204  at the outer surface of the metal frame  202 . The tapering of the well  204  may assist with the guidance and connectivity of an associated power and data connector as it is inserted into the well  204 . 
     As described above, the USB port  30  may be configured to connect to a power and data connector in order to recharge batteries of the wearable electronic device and/or transmit/receive data from another computing device.  FIG. 3  shows an example power and data connector  300  for connecting to a power and data port, such as USB port  30  of  FIGS. 1B and 2 . Power and data connector  300  includes a connector head  302  on one end of a power and data cable  304  and terminates in a power and data plug (e.g., a USB plug  306 ) on an opposite end of power and data cable  304 . For example, USB plug  306  may be configured to couple with a USB port on a computing device, wall-mounted recharger, and/or other recharging device. It is to be understood that other examples may include additional or alternative power and data plugs (e.g., Ethernet, FireWire, eSATA, Thunderbolt, etc.) and/or other types of USB plugs than illustrated (e.g., mini-B USB plugs, micro-A/B USB plugs, etc.). Connector head  302  and associated electrical components may be a male connector configured to couple with a female port (e.g., USB port) on a portable computing device, such as wearable electronic device  10  of  FIGS. 1A and 1B . Power and data cable  304  may be any suitable size/shape of cabling and may include a plurality of wires bundled together (e.g., including a twisted pair configuration) and/or electrically isolated from one another. The bundle of wires in the power and data cable may be encased in an electrically non-conductive material. 
     Connector head  302  may form a body of the power and data connector and include a top surface  308  of a connector housing, from which power and data cable  304  extends. For example, a strain relief  310  may be centered on top surface  308  and/or placed in a location to ensure a balance of weight distribution on different sides of the power and data cable. The connector head  302  and/or connector housing may be bisected by seam  309 , and strain relief may be centered along the seam. Strain relief  310  may also restrict and/or bias power and data cable  304  to extend in a substantially straight line perpendicular to top surface  308  for a particular length of the cable. In some examples, strain relief  310  may cause the power and data cable to be less flexible in a region near connector head  302  than other regions of the cable (e.g., a center region between connector head  302  and USB plug  306 ). Increased rigidity in this end region may allow power and data cable  304  to substantially support the weight of connector head  302 . This rigidity may allow a user to guide the connector head to a location without directly holding or touching the connector head (e.g., when a user&#39;s fingers/hand may obscure a connection location if placed on or near the connector head). The strain relief may also protect the cabling from wear and tear at a junction between the power and data cable  304  and the connector head  302 . 
     A front surface  312  of connector head  302  may be adjacent to the top surface  308 . For example, seam  309  may bisect connector head  302  into a front and back portion (e.g., bisecting the top, bottom, and side surfaces of the connector head and/or connector housing). Front surface  312  may be a front/outer surface of the front portion of the connector head. Front surface  312  may be a magnetically attractive surface and may include a stage  314  protruding from a central, depressed region of the surface. The stage  314  may protrude from a front surface of the connector housing and/or from an internal component of the connector head  302 . A plurality of electrical contacts  316  may protrude through openings in the stage  314  and may be configured to interface with associated charging contact pads of a computing device, such as charging contact pads  206  of wearable electronic device  10  as illustrated in  FIG. 2 . A peripheral region  317  of front surface  312  may include a portion of the connector head and/or connector housing that protrudes relative to a central region of the front surface  312 . For example, the connector housing of the power and data connector may include an overlapping edge that is in a parallel plane to the magnetically attractable surface and extends around a periphery of the magnetically attractable surface. 
     The central region of the front surface  312  may include a film  318  adhered to one or more magnetically attractable elements disposed in the connector head  302  and/or connector housing in some examples. The one or more magnetically attractable elements disposed in the connector head may include a permanent magnet, an electromagnet, and/or a material element that is attractable by a magnet in some examples. The film  318  may additionally or alternatively be adhered to a portion of the front surface  312  of the connector housing that is depressed relative to the peripheral region  317 . Covering the magnet(s) with a film, rather than the thicker plastic material of the connector housing, allows the magnet(s) to be as close as possible to a magnetically attractable element while still preventing direct exposure of the magnet. The film may be a thin, flexible material, such as Mylar. 
       FIGS. 4A-4C  show several views of the connector head  302  of  FIG. 3 . In particular,  FIG. 4A  shows a front view of the connector head  302 . As illustrated, the electrical connectors may have mirrored-physical and -electrical symmetry to one another, a vertical axis  402  being the axis of symmetry. Vertical axis  402  bisects only a center electrical connector and is perpendicular to longitudinal axis  404 , which bisects all of the electrical connectors and/or a front surface of the connector head  302  along a widest dimension of the stage  314  and/or the front surface of the connector head  302 . Magnets  406  may be disposed in the connector head  302  under film  318 , creating a magnetic front surface of the connector head. Magnets  406  may be symmetric to one another, and the vertical and/or longitudinal axes  402  and  404  may be the axis of symmetry of the magnets  406 . Each of the magnets may be positioned to protrude through and/or be flush with a respective opening in an outer surface of a front portion of the connector housing. In some embodiments, film  318  may contact only magnets  406  and the connector housing may not extend within the central, depressed region of the front surface  312  of the connector head  302 . 
     In some examples, film  318  may be a ring-shaped, generally rectangular flexible adhesive material adapted to contact the metal frame  202  of the USB port  30  illustrated in  FIG. 2 . The geometric area of the film may be at least 2.5 times larger than the geometric area of the stage  314  in order to provide coverage for a large area of magnetic element surfaces (e.g., to provide a large magnetic force) and/or to enable the film to contact all or most of the metal frame  202 . Film  318  may be disposed on, in face-sharing contact with, and/or adhered to a depressed region of an outer surface of a front portion of the connector head and/or the connector housing. Film  318  may further be disposed on, in face-sharing contact with, and/or adhered to magnets  406  in order to provide a thinner buffer between the magnets and a magnetically attractable surface (e.g., the metal frame  202  of the USB port  30 ) than the connector housing of the connector head  302  may provide. The magnetic force provided by the magnets may be increased by decreasing a thickness of the buffer. 
       FIG. 4B  shows a rear view of the connector head  302  including a back portion of the connector housing of the connector head. The view in  FIG. 4B  depicts the overall shape of the connector head  302  and/or connector housing, namely a generally rectangular shape with rounded corners in the illustrated example. It is to be understood that the connector head  302  may have any suitable shape in other examples. For example, the connector head  302  may be generally oval, generally polygonal, and/or any suitable shape with any number of straight and/or curved segments. The connector housing may form all or some of the outer surfaces of the connector head  302 , and thus the connector housing may follow a shape of the connector head  302 . 
       FIG. 4C  shows a top view of the connector head  302 . The view in  FIG. 4C  depicts the protrusion of the stage  314  and electrical contacts  316  relative to one another and relative to the peripheral region  317  of the front surface  312  of the connector head  302 . For example, as shown, the stage  314  protrudes relative to the peripheral region  317  by an amount that is smaller than the amount of protrusion of the electrical contacts  316  relative to the stage  314 .  FIG. 4C  also shows that the peripheral region  317  of the front surface  312 , the stage  314 , and the film  318  (contacting the depressed region of the front surface  312 ) are all substantially planar in a horizontal dimension that is parallel to the longitudinal axis  404 . 
       FIG. 4D  shows a side view of the connector head  302 . The view in  FIG. 4D  depicts the shape of the protrusion of the electrical contacts  316 , the shape of the protrusion of the stage  314 , and the curvature of the connector head  302  and/or the connector housing (e.g., the front surface  312 ) and film  318  (e.g., contacting the depressed region of the front surface  312 ). As illustrated, the electrical contacts  316  include a triangular peak protruding from the stage  314 . As described in more detail with respect to  FIGS. 6 and 7 , the electrical contacts  316  may be configured to be spring-loaded such that the contacts are biased to protrude from the stage  314 , and may be depressed toward the connector head  302  (e.g., into the stage  314 ) responsive to force applied to the triangular peak. An outer surface of the stage  314  (e.g., the surface of the stage that is closest to the peak of the electrical contacts  316 ) may be planar in a dimension parallel to the vertical axis  402 . Walls  408  of the stage  314  extending toward the connector head may be angled outward such that a base of the stage (e.g., a region of the stage closer to the connector head than the outer surface of the stage) has a larger geometric area (e.g., is longer and/or wider) than the outer surface of the stage. The front surface  312  of the connector head and the film  318  contacting the depressed region of the front surface  312  may curve concavely in the dimension parallel to the vertical axis  402  as illustrated. As the metal frame of the USB port  30  of the wearable electronic device may be slightly curved in a similar dimension in order to follow a curvature of a user&#39;s wrist, the connector head and film may be curved to enable a secure connection to the USB port. 
       FIG. 5  schematically depicts electrical connections of the connector head  302 . Wires from the power and data cable  304  may include a ground wire (GND), a positive data signal wire (D+), a negative data signal wire (D−), and a voltage signal wire (Vbus). Each signal wire may be electrically connected to an associated contact pad on a substrate (e.g., a printed circuit board) in the connector head  302  (e.g., within a housing of the connector head). Each electrical contact  316  may be electrically connected to an associated contact pad on an opposite side of the substrate from the wires and thereby electrically connected to one of a ground wire, a data signal wire, and a voltage signal wire. As the electrical contacts  316  may be mirror symmetric, a pair of electrical contacts symmetrically disposed with respect to the vertical axis may be electrically connected to the same contact pad and associated signal wire. For example, a pair of outermost electrical contacts may each be connected to the ground contact pad/signal wire, as illustrated. Likewise, another pair of electrical contacts may each be connected to the positive data contact pad/signal wire, as illustrated. 
       FIG. 6  shows an interior view of a front of the connector head  302  (e.g., within a connector housing of the connector head). For example,  FIG. 6  illustrates an interior view of the front of the connector head  302  with a front connector head portion (e.g., a front portion of the housing) removed. As illustrated, a plurality of magnets  406  are disposed (e.g., within pockets or walled regions formed in the interior of the back connector head portion) alongside the plurality of electrical contacts  316 . 
       FIG. 7  shows a detailed view of the electrical contacts  316 , as viewable when the magnets  406  and other elements interfering with a view of the electrical contacts are removed from the interior of the connector head  302  and/or connector housing. As shown, each electrical contact  316  comprises a substantially rectangular strip of electrically conductive material (e.g., gold or any other suitable metal or metal alloy) mounted at one end to a substrate. The material forming the electrical contacts may be deformed to create a spring-loaded contact. For example, the rectangular strip forming the electrical contacts may be deformed, thereby producing a triangular peak that is biased to protrude from the stage (and the front portion of the connector head  302 ) and is moveable toward the stage  314  (and the back portion of the connector head  302 ) responsive to a force applied to the triangular peak. Accordingly, the triangular peak may be positioned at an end of the rectangular strip that is opposite from the end that is connected to the substrate  504 . 
     In order to promote flexibility in a direction toward the back portion of the connector head  302 , the electrical contacts  316  may include a plurality of bended regions. For example, the electrical contact may extend, at a location of contact, away from a power and data cable  304  in a planar manner along a first plane that is coplanar with the substrate  504 . The electrical contact may then bend upward approximately 30-60 degrees (e.g. 45 degrees) from the first plane and then continue along a second plane that is parallel to and above the first plane. The electrical contact may then bend approximately 180 degrees to extend toward the power and data cable  304  along a third plane that is parallel to and above the second plane. Leading to the triangular peak, the electrical contact may extend at an angle of approximately 30-60 degrees (e.g., 55 degrees) from the third plane and terminate in the above-described triangular peak. 
     The spring-loaded electrical contacts  316  illustrated in  FIGS. 6 and 7  may have a small width relative to other types of electrical contacts, enabling the illustrated number of contacts to produce a mirror-symmetric pin-out in a relatively small space. However, it is to be understood that any suitable electrical contact or combination of electrical contacts may be utilized without departing from the scope of this disclosure. 
     The above-described power and data connector may provide a mechanical or tactile feedback via a raised center stage and alignment properties of a magnetically attractive surface surrounding the raised center stage. In this way, the magnetic feature advantageously provides the aligning and coupling force to maintain the connection between the connector and the device, and the raised center stage advantageously provides the tactile feedback to the user as the connector snaps into place. The inclusions of the magnetic and mechanical features in combination leverage the advantages of both in a complementary manner. 
     Additional or alternative power and data connectors may be utilized to recharge a wearable electronic device.  FIGS. 8A and 8B  show different views of an exemplary wearable charging device  800 . For example, wearable charging device  800  may take the form of an adjustable wrist band as illustrated. As shown in  FIG. 8A , wearable charging device  800  may include one or more batteries  802  disposed in, on, under, and/or around a wrist band  804 . Wrist band  804  may additionally or alternatively incorporate solar panels to generate power from light. Wrist band  804  may be composed of any suitable flexible, rigid, and/or composite material including but not limited to cloth, silicone, rubber, metal, etc. In some examples, wrist band  804  may include a substrate disposed between layers of a cover material and/or within a cover material. In such examples, batteries  802  may be disposed between the substrate and the cover material and/or within the substrate. Wrist band  804  may include one or more fastening mechanisms, including but not limited to magnetic and/or mechanical (e.g., button, snap, clasp, etc.) fasteners. Wrist band  804  may additionally or alternatively utilize a hinged or flexible cuff configuration to adjustably conform to a wrist. As shown in  FIG. 8B , a It is to be understood that the shape, material, and configuration of wrist band  804  may take any suitable form, include those described above with respect to wearable electronic device  10  of  FIGS. 1A and 1B . 
     As shown in  FIG. 8A , wrist band  804  may include a protruding charging surface  806  adapted to engage with a power and data port, such as USB port  30  of  FIGS. 1A, 1B, and 2 . For example, wrist band  804  may be configured to be worn alongside a wearable device, such as wearable electronic device  10  of  FIGS. 1A and 1B . Charging surface  806  may thereby be inserted between the wearable device and the user&#39;s wrist to contact a power and data port of the wearable device. In other words, an upper and/or outer surface of charging surface  806  may be configured to be in face-sharing contact with an outer surface of a power and data port (e.g., an underside of a display of a wearable electronic device). Charging surface  806  may include a plurality of charging pins  808  configured to electrically connect to respective charging pads on a power and data port, such as charging contact pads  206  of  FIG. 2 . Charging pins  808  may be spring-loaded and/or take any suitable form as described above with respect to electrical contacts  316  of  FIG. 3 . For example, charging pins  808  may have a POGO pin configuration in some examples. Charging surface  806  may include one or more magnets  810  (e.g., disposed under a surface material in a similar manner to batteries  802 ) in order to assist with alignment and attachment to the power and data port. For example, magnets  810  may be positioned at locations relative to charging pins  808  selected to ensure contact to metal frame  202  of USB port  30  illustrated in  FIG. 2 . 
     Wrist band  804  may include an indicator  812  configured to output a visual indication of a charging state, battery consumption level, and/or other status of the charging device (e.g., wearable charging device  800 ) and/or device being charged (e.g., wearable electronic device  10 ). For example, indicator  812  may be configured to output different colors, patterns, and/or sequences of light to provide feedback regarding the different statuses. In some examples, audible and/or tactile feedback may be provided via associated feedback devices (e.g., speakers, motors, etc.). One or more locations on wrist band  804  may be touch-sensitive, enabling a user to provide input to the charging device and/or the device being charged (e.g., via control signals transmitted through charging pins  808 ). Wrist band  804  may include a wireless transceiver to enable a connected device to communicate with other devices, servers, and cloud-based devices using telecommunication protocols such as 3G, 4G, and LTE cellular protocols, and 802.11 Wi-Fi protocols. 
     Wearable charging device  800  may enable a wearable electronic device to be recharged during operation. By cooperating with an overall shape of the wearable electronic device, the charging device may provide a comfortable and convenient battery boost during heavy and/or long use of the wearable electronic device. 
     As evident from the foregoing description, the methods and processes described herein may be tied to a sensory-and-logic system of one or more machines. Such methods and processes may be implemented as a computer-application program or service, an application-programming interface (API), a library, firmware, and/or other computer-program product.  FIGS. 1A and 1B  show one, non-limiting example of a sensory-and-logic system to enact the methods and processes described herein. However, these methods and process may also be enacted on sensory-and-logic systems of other configurations and form factors, as shown schematically in  FIG. 9 . 
       FIG. 9  schematically shows a form-agnostic sensory-and-logic system  910  that includes a sensor suite  912  operatively coupled to a compute system  914 . The compute system includes a logic machine  916  and a data-storage machine  918 . The compute system is operatively coupled to a display subsystem  920 , a communication subsystem  922 , an input subsystem  924 , and/or other components not shown in  FIG. 9 . 
     Logic machine  916  includes one or more physical devices configured to execute instructions. The logic machine may be configured to execute instructions that are part of one or more applications, services, programs, routines, libraries, objects, components, data structures, or other logical constructs. Such instructions may be implemented to perform a task, implement a data type, transform the state of one or more components, achieve a technical effect, or otherwise arrive at a desired result. 
     Logic machine  916  may include one or more processors configured to execute software instructions. Additionally or alternatively, the logic machine may include one or more hardware or firmware logic machines configured to execute hardware or firmware instructions. Processors of the logic machine may be single-core or multi-core, and the instructions executed thereon may be configured for sequential, parallel, and/or distributed processing. Individual components of a logic machine optionally may be distributed among two or more separate devices, which may be remotely located and/or configured for coordinated processing. Aspects of a logic machine may be virtualized and executed by remotely accessible, networked computing devices in a cloud-computing configuration. 
     Data-storage machine  918  includes one or more physical devices configured to hold instructions executable by logic machine  916  to implement the methods and processes described herein. When such methods and processes are implemented, the state of the data-storage machine may be transformed—e.g., to hold different data. The data-storage machine may include removable and/or built-in devices; it may include optical memory (e.g., CD, DVD, HD-DVD, Blu-Ray Disc, etc.), semiconductor memory (e.g., RAM, EPROM, EEPROM, etc.), and/or magnetic memory (e.g., hard-disk drive, floppy-disk drive, tape drive, MRAM, etc.), among others. The data-storage machine may include volatile, nonvolatile, dynamic, static, read/write, read-only, random-access, sequential-access, location-addressable, file-addressable, and/or content-addressable devices. 
     It will be appreciated that data-storage machine  918  includes one or more physical devices. However, aspects of the instructions described herein alternatively may be propagated by a communication medium (e.g., an electromagnetic signal, an optical signal, etc.) that is not held by a physical device for a finite duration. 
     Aspects of logic machine  916  and data-storage machine  918  may be integrated together into one or more hardware-logic components. Such hardware-logic components may include field-programmable gate arrays (FPGAs), program- and application-specific integrated circuits (PASIC/ASICs), program- and application-specific standard products (PSSP/ASSPs), system-on-a-chip (SOC), and complex programmable logic devices (CPLDs), for example. 
     Display subsystem  920  may be used to present a visual representation of data held by data-storage machine  918 . This visual representation may take the form of a graphical user interface (GUI). As the herein described methods and processes change the data held by the storage machine, and thus transform the state of the storage machine, the state of display subsystem  920  may likewise be transformed to visually represent changes in the underlying data. Display subsystem  920  may include one or more display subsystem devices utilizing virtually any type of technology. Such display subsystem devices may be combined with logic machine  916  and/or data-storage machine  918  in a shared enclosure, or such display subsystem devices may be peripheral display subsystem devices. Display  20  of  FIGS. 1A and 1B  is an example of display subsystem  920 . 
     Communication subsystem  922  may be configured to communicatively couple compute system  914  to one or more other computing devices. The communication subsystem may include wired and/or wireless communication devices compatible with one or more different communication protocols. As non-limiting examples, the communication subsystem may be configured for communication via a wireless telephone network, a local- or wide-area network, and/or the Internet. Communication suite  24  of  FIGS. 1A and 1B  is an example of communication subsystem  922 . 
     Input subsystem  924  may comprise or interface with one or more user-input devices such as a keyboard, mouse, touch screen, or game controller. In some examples, the input subsystem may comprise or interface with selected natural user input (NUI) componentry. Such componentry may be integrated or peripheral, and the transduction and/or processing of input actions may be handled on- or off-board. Example NUI componentry may include a microphone for speech and/or voice recognition; an infrared, color, stereoscopic, and/or depth camera for machine vision and/or gesture recognition; a head tracker, eye tracker, accelerometer, and/or gyroscope for motion detection and/or intent recognition; as well as electric-field sensing componentry for assessing brain activity. Touch screen sensor  32  and push buttons  34  of  FIGS. 1A and 1B  are examples of input subsystem  924 . 
     Sensor suite  912  may include one or more different sensors—e.g., a touch-screen sensor, push-button sensor, microphone, visible-light sensor, ultraviolet sensor, ambient-temperature sensor, contact sensors, optical pulse-rate sensor, accelerometer, gyroscope, magnetometer, and/or GPS receiver—as described above with reference to  FIGS. 1A and 1B . 
     It will be understood that the configurations and approaches described herein are exemplary in nature, and that these specific implementations or examples are not to be taken in a limiting sense, because numerous variations are feasible. The specific routines or methods described herein may represent one or more processing strategies. As such, various acts shown or described may be performed in the sequence shown or described, in other sequences, in parallel, or omitted. 
     The subject matter of this disclosure includes all novel and non-obvious combinations and sub-combinations of the various processes, systems and configurations, and other features, functions, acts, and/or properties disclosed herein, as well as any and all equivalents thereof.