Abstract:
A wearable device has an internal rechargeable power source for supplying power to internal circuitry of the device. An external rechargeable battery pack is physically and electrically interfaced to the wearable device and provides power to recharge the internal rechargeable power source while the device is being worn, thereby eliminating the need to connect the wearable device directly to a source of electricity using wires. The rechargeable battery pack is recharged in a charging station connected to a source of electricity.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to the field of recharging battery operated devices and more particularly to recharging battery operated devices that are worn for extended periods of time. 
     2. Description of the Related Art 
     Battery powered devices intended to be worn by people, animals or inanimate objects for extended periods of time often need to be recharged. An example of this type of device is a personal locator system such as those used to track individuals who are under house arrest. Because devices such as these must be active 24 hours per day and are not allowed to be removed, the task of recharging their internal batteries is very difficult. Currently, the wearer must remain tethered to a cable that provides power for recharging the internal batteries, causing the wearer to remain in the locale of the charger for the length of time required to recharge the internal batteries, sometimes several hours. During this time, the cable can get loose and fail to recharge the batteries or a person can get the cable caught on their legs, causing breakage of the cable or tripping of the person. It is also very easy for the wearer to forget they are connected to the charging cable and attempt to walk away, also causing breakage of the cable or tripping of the wearer. 
     U.S. Pat. No. 6,909,915 to Greatbatch, et al. is hereby incorporated by reference and has an implantable medical device with a dual battery system for generating higher currents needed during a defibrillation operation of the device. 
     US Pat. Publication No. US 2003/0155887 to Bourilkov, et al. is hereby incorporated by reference and shows one way to charge a battery from a primary (not rechargeable) battery. 
     What is needed is a system, device and method that will provide a device that can be worn 24 hours a day and provide un-tethered recharging of the device&#39;s internal batteries. 
     SUMMARY OF THE INVENTION 
     In one embodiment, a system for powering a worn device is disclosed including a rechargeable power source housed within the worn device and a charging interface on an outside surface of the worn device for holding a rechargeable battery pack and conducting electricity from the rechargeable battery pack into the worn device. There is a charge control circuit in the worn device for accepting the electricity from the charging interface and charging the rechargeable power source and a powered circuit housed within the worn device powered by the rechargeable power source. 
     In another embodiment, a method of charging a worn device is disclosed including providing the worn device with an internal rechargeable power source and a charging interface on an outside surface. The charging interface accepts and holds a rechargeable battery pack and conducts electricity from the rechargeable battery pack into the worn device. A charge control circuit within the worn device accepts the electricity from the charging interface and charges the rechargeable power source. There is an active circuit within the worn device and powered by the rechargeable power source. Also provided is the rechargeable battery pack and a charging station. The charging station is connected to a source of electricity and accepts and charges the rechargeable battery pack. The method includes charging the rechargeable battery pack in the charging station, transferring the rechargeable battery pack from the charging station to the charging interface on the worn device and charging the rechargeable power source from the rechargeable battery pack through the charge control interface. 
     In another embodiment, a wearable apparatus is disclosed including a rechargeable power source housed within the wearable apparatus and a powered circuit configured to utilize power from the rechargeable power source also housed within the wearable apparatus and a physical and electrical connection between an external power pack and the wearable apparatus. Also within the wearable apparatus is a charge control circuit that accepts power from the external power pack through the electrical connection and recharges the rechargeable power source. 
     In another embodiment, a locator device is disclosed including a rechargeable power source housed within the locator device and a charging interface on an outside surface of the locator device adapted to accept and hold a rechargeable battery pack and adapted to conduct electricity from the rechargeable battery pack into the locator device. Also included is a charge control circuit for accepting the electricity from the charging interface and charging the rechargeable power source also housed within the locator device and a locator circuit housed within the locator device, the locator circuit powered by the rechargeable power source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention can be best understood by those having ordinary skill in the art by reference to the following detailed description when considered in conjunction with the accompanying drawings in which: 
         FIG. 1  is a perspective view of a worn device of the present invention with the battery pack attached. 
         FIG. 2  is a perspective view of the worn device of the present invention with the battery pack separated. 
         FIG. 3  is a perspective view of a charging device of the present invention with the battery pack inserted. 
         FIG. 4  is a perspective view of a charging device of the present invention with the battery pack separated. 
         FIG. 5  is a block diagram of the worn device of the present invention. 
         FIG. 6  is a block diagram of the locator device of the present invention. 
         FIG. 7  is a flow chart describing the use of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Throughout the following detailed description, the same reference numerals refer to the same elements in all figures. 
     Referring to  FIG. 1 , a perspective view of a worn device of the present invention with the battery pack attached will be described. The worn device  10  is affixed to a person, animal or inanimate device by a strap  12 . In some embodiments, the strap  12  has a buckle or other method of removing. In the present embodiment, the strap  12  is locked in place by a plurality of pins  14  (in some embodiments, latches) that pass through the worn device  10  and the strap  12 , securing the strap  12  to the worn device  10  and making it difficult to remove the worn device  10  from whatever it is attached. A rechargeable battery pack  30  is installed on the worn device  10  through rails  32  which are further described in  FIG. 2 . In another embodiment, the rechargeable battery pack  30  slides into a compartment, clip, holster or opening on a surface of the worn device  10 . There are many ways known in the art to mount a battery pack to a device and this application is not limited to any particular mounting or attaching mechanism. Furthermore, in some embodiments, the battery pack is strapped to the person wearing the worn device and attached to the worn device by wires or cables. The rechargeable battery pack  30  consists of one or more high capacity capacitors or battery cells such as: lithium ion battery cells, nickel-metal hydride battery cells, lead acid battery cells, nickel-cadmium battery cells or lithium polymer battery cells. 
     In some embodiments, the worn device  10  is a personal locator or location transmitter, often used by law enforcement or corrections agency to monitor an individual who is under house arrest or the like. The locator  10  is locked onto the person&#39;s leg by a strap  12  that has pins  14  passing through it to lock it in place or by other means of locking. Since the locator  10  is worn for extended periods of time, perhaps years, there must be a way to recharge its internal power source. Prior to the present invention, the wearer was required to connect a power source cable or wire to the locator for enough time each day as to charge the internal power source. Unfortunately, the connection required the wearer to stay in one spot for a long period of time and the cable is very difficult to manage, presenting a tripping hazard as well. The present invention overcomes this problem by providing a rechargeable battery pack  30  that is charged, then clipped onto the locator  10  and the internal power source is charged from the rechargeable battery pack  30  without tethering the wearer to a charging station. 
     Referring to  FIG. 2 , a perspective view of the worn device of the present invention with the rechargeable battery pack separated will be described. The worn device  10  has a strap  12  for affixing it to a person, animal or inanimate object. Pins  14  lock the strap to the worn device  10 . A charging interface consists of a mechanical interface and an electrical interface. The mechanical interface includes slots  34  in the worn device  10  that accept rails  32  in the rechargeable battery pack  30 , holding the rechargeable battery pack  30  against the worn device  10 . In some embodiments, the rechargeable battery pack  30  stays in place by the force of gravity. In this embodiment, a detent  56  in the rechargeable battery pack  30  engages with a detent hole  36  in the worn device  10 , holding the rechargeable battery pack  30  in place. The electrical interface includes battery contacts  50 / 52 / 54  that mate with contacts  40 / 42 / 44  on the worn device, passing electric current and, in some embodiments, battery status between the worn device  10  and the rechargeable battery pack  30 . Although three contacts are shown, at least two are required to form a closed circuit passing electric current. In some embodiments, the number of contacts on the rechargeable battery pack  30  is different from the number of contacts on the worn device  10 , as long as there are at least two that match. 
     Referring to  FIG. 3 , a perspective view of a charging station of the present invention with the rechargeable battery pack  30  inserted will be described. The rechargeable battery pack  30  is shown with its rails  32  inserted into a charging station  68 . The charging station  68  has electrical connections  66  for accepting electric current from a source of electricity such as a standard household circuit. In this embodiment, the charging device plugs directly into a common household electric outlet. In other embodiments, the charging device may be a station with a power cord that plugs into an electrical outlet or it may have a power supply or “brick” that plugs into an electrical outlet and provides low voltage to the charging device. In other embodiments, the charging station is a power brick or wall-wart that plugs directly into the rechargeable battery pack  30  and the battery pack and/or wall wart has circuitry to control the charging of the battery pack  30 . 
     Referring to  FIG. 4 , a perspective view of a charging station of the present invention with the battery pack separated. The rechargeable battery pack  30  is shown with its rails  32  for insertion into charging station slots  70 . The charging station  68  has electrical connections  66  for accepting electric current from a source of electricity such as a standard household circuit. In this embodiment, the charging station  68  plugs directly into a common household electric outlet. Although the rechargeable battery pack  30  is shown with a bump  56  that holds it in place when the bump  56  mates with detent  76 , the charging system works equally as well when the rechargeable battery pack  30  is held in place by gravity. Contacts  50 / 52 / 54  on the battery mate with contacts  60 / 62 / 64  on the charging device and provide charging current and in some embodiments, battery status between the charging station  68  and the rechargeable battery pack  30 . 
     Referring now to  FIG. 5 , the electrical operation of the system will be described. The wearable device  10  has a plurality of contacts  40 / 42 / 44  for mating with a plurality of contacts  50 / 52 / 54  on the rechargeable battery pack  30 , making electrical contact when the rechargeable battery pack is attached to the wearable device  10 . The plurality of contacts  40 / 42 / 44  on the wearable device passes electrical signals through the housing of the wearable device  10  and into a charge control circuit  110  within the wearable device  10 . In this embodiment, there are three contacts  40 / 42 / 44  carrying three electrical signals  120 / 121 / 122  consisting of a positive voltage signal  120 , a status signal  121  and a negative voltage signal  122 . The positive  120  and negative  122  voltage signals provide electrical current to the charge control circuit  110  while the status signal  121  provides information regarding the current charge level of the rechargeable battery pack  30 . In some embodiments two contacts are provided for a positive voltage signal  120  and a negative voltage signal  122 . Any number of contacts may be used, as needed, as long as there are at least two contacts to provide a closed circuit, enabling current flow. 
     The charge control circuit  110  uses the electric current from the rechargeable battery pack  30  to recharge an internal rechargeable power source  112 , in this example, a rechargeable battery  112 . The rechargeable battery  112  consists of one or more battery cells, for example, lithium ion battery cells, nickel-metal hydride battery cells, lead acid battery cells, nickel-cadmium battery cells or lithium polymer battery cells. In some embodiments, the internal rechargeable power source  112  is a capacitor such as a super capacitor. In some embodiments, the internal power source  112  is designed to power the worn device for a short period of time, long enough to remove the rechargeable battery pack  30  and replace it with a second rechargeable battery pack  30  that has been recharged. 
     The internal rechargeable battery  112  has three connections  124 / 125 / 126  to the charge control circuit  110 , positive  124 , negative  126  and status  125 . The charge control circuit  110  provides charging control to the internal rechargeable battery  112  while providing power to the internal powered circuit or active circuit  114  through a positive conductor  130  and a negative conductor  132 , although in some embodiments multiple voltage levels are provided to the powered circuit  114 . The charge control circuit  110  has voltage and current conditioning circuitry to provide the correct voltages and currents to the powered circuit  114  both when the rechargeable battery pack  30  is connected and when the rechargeable battery pack  30  is absent. In some embodiments, the worn device is a location transmitter and the powered circuit  114  is a locator device circuit as shown in  FIG. 1 . In some embodiments, the powered circuit  114  includes a processor and memory. 
     Referring now to  FIG. 6 , the electrical operation of the locator device will be described. The wearable device  10  has a plurality of contacts  40 / 42 / 44  for mating with a plurality of contacts  50 / 52 / 54  on the rechargeable battery pack  30 , making electrical contact when the rechargeable battery pack  30  is installed on the wearable device  10 . The plurality of contacts  40 / 42 / 44  on the wearable device, pass electrical signals through the housing of the wearable device  10  and into a charge control circuit  110  within the wearable device  10 . In this embodiment, there are three contacts  40 / 42 / 44  carrying three electrical signals consisting of a positive voltage signal  120 , a status signal  121  and a negative voltage signal  122 . The positive  120  and negative  122  voltage signals provide electrical current to the charge control circuit and the status signal provides information regarding the current charge level of the rechargeable battery pack  30 . In some embodiments two contacts are provided for a positive voltage signal  40  and a negative voltage signal  44 . Any number of contacts may be used, as needed, as long as there are at least two contacts to provide a closed circuit, enabling current flow. 
     The charge control circuit  110  uses the electric current from the rechargeable battery pack  30  to recharge an internal rechargeable power source  112 , in this example, a rechargeable battery  112 . In this example, the internal rechargeable battery  112  has three connections  124 / 125 / 126  to the charge control circuit  110 , positive  124 , negative  126  and status  125 . The charge control circuit  110  provides charging control to the rechargeable battery  112  while providing power to the locator circuit  140  through a positive conductor  130  and a negative conductor  132 . The charge control circuit  110  has voltage and current conditioning circuitry to provide the correct voltages and currents to the locator circuit  140  both when the rechargeable battery pack  30  is connected and when the rechargeable battery pack  30  is absent, at which time power is provided from the rechargeable battery  112 . The locator circuit  140  has a location receiver, in this example a GPS receiver  142  with a GPS antenna  144 . In addition, the locator circuit  140  has a wireless transmitter (or transceiver)  146  with an antenna  148  for sending location information. In some embodiments, the wireless transmitter (or transceiver) uses radio frequency waves while in other embodiments, it uses light waves such as infra-red. 
     Referring now to  FIG. 7 , the operation of the locator device will be described. To start, the rechargeable battery pack  30  is placed in the charger  68  (step  200 ). Next, wait for the rechargeable battery pack  30  to charge  210 . Next, the rechargeable battery pack  30  is moved and inserted into the worn device  10  (step  220 ). The rechargeable battery pack  30  is left attached to the worn device  10  long enough to charge the internal power source  112  in step  230 . Once the internal power source  112  is sufficiently charged, the rechargeable battery pack  30  is moved back and attached to the charger  68  (step  240 ) then the process is repeated with step  210 . 
     There are many ways to determine if the rechargeable battery pack  30  and internal power source  112  are charged, including charging light emitting diodes (LEDs) or lamps, charge complete LEDs or lamps or audible signals. 
     Equivalent elements can be substituted for the ones set forth above such that they perform in substantially the same manner in substantially the same way for achieving substantially the same result. 
     It is believed that the system and method of the present invention and many of its attendant advantages will be understood by the foregoing description. It is also believed that it will be apparent that various changes may be made in the form, construction and arrangement of the components thereof without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely exemplary and explanatory embodiment thereof. It is the intention of the following claims to encompass and include such changes.