Abstract:
One embodiment disclosed relates to a laptop computer system including a display casing, having display circuitry and a display screen, and a main computer casing coupled to the display casing. The main computer casing includes a battery power source, a charging regulator, and an Ethernet-type connector. The battery power source is coupled to a motherboard switching regulator. The charging regulator is coupled to the battery power source and configured to recharge the battery power source. The Ethernet-type connector coupled to the charging regulator and configured to provide power thereto.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates generally to computers and more particularly to charging batteries of laptop computers. 
   2. Description of the Background Art 
   Computer systems come in many shapes, sizes and computational ability. For persons who work in designated locations, a standard desktop computer may be sufficient to fulfill that person&#39;s needs. However, for a user who travels frequently and needs computing power in those travels, a portable or laptop computer is desirable. 
   Laptop computers are characterized in that the entire computing functionality is incorporated into a single package. That is, the motherboard, hard drive, disk drives, CD ROM drives, keyboard and display are all packaged in a compact device typically weighing less than ten pounds. Laptop computers are fully functional in that they may execute the very same programs, for example word processors and spreadsheet programs, as full sized or desktop computers. Laptop computers have a battery that allows for remote operation of the laptop even in locations where alternating current (AC) wall socket power is not available. 
   While laptop computers may address portable computing needs, they are not without their limitations. For example, the keyboards of most laptop computers are a non-standard size. That is, the keys may be slightly closer together and not as ergonomically placed as a standard keyboard. A further limitation of laptops, given the relatively small size, is they only have a limited number of communication ports available. Also, the display devices for laptop computers are typically small, as compared to desktop monitors, to keep the overall size of the laptop computer small. 
   Of particular relevance to this disclosure, a laptop computer can only operate for a limited time using battery power. This is because a laptop computer&#39;s microprocessor, display screen, and other components require significant power to run, and the laptop battery can only hold a limited amount of power. In order to counteract the limited operating time using battery power, many users carry a second charged-up battery. Many users also carry around a somewhat cumbersome AC-to-DC power converter along with the laptop so as to be able to plug into a conventional power socket when available. 
   SUMMARY 
   One embodiment disclosed relates to a laptop computer system including a display casing, having display circuitry and a display screen, and a main computer casing coupled to the display casing. The main computer casing includes a battery power source, a charging regulator, and an Ethernet-type connector. The battery power source is coupled to a motherboard switching regulator. The charging regulator is coupled to the battery power source and configured to recharge the battery power source. The Ethernet-type connector coupled to the charging regulator and configured to provide power thereto. 
   Another embodiment disclosed relates a portable computer system including at least a battery power source, a charging regulator, a first Ethernet-type connector, and a second Ethernet-type connector. The battery power source is coupled to a motherboard switching regulator, and the charging regulator coupled to the battery power source and configured to recharge the battery power source. The first Ethernet-type connector coupled to the charging regulator and configured to provide power thereto. The second Ethernet-type connector is also coupled to the charging regulator and configured to provide power thereto. 
   Another embodiment disclosed relates to a method of extending an operating time of a battery-powered notebook computer. An Ethernet-type connector of the notebook computer is coupled to a network port that provides power. Power is received from the network port and is stepped-down from a higher voltage level to a lower voltage level. The power at the lower voltage level is provided to a charging regulator. The power provided from the network port is insufficient for full operation of the notebook computer and so is used to extend the operating time of the notebook computer running on battery power. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of a notebook or laptop computer in accordance with an embodiment of the invention. 
       FIG. 2  is a block diagram of the electrical power system of the laptop computer of  FIG. 1  in accordance with an embodiment of the present invention. 
       FIG. 3  depicts a portion of the electrical power system of  FIG. 2  in greater detail in accordance with an embodiment of the present invention. 
       FIG. 4  is a perspective view of a notebook or laptop computer in accordance with another embodiment of the invention. 
       FIG. 5  is a block diagram of the electrical power system of the laptop computer of  FIG. 4  in accordance with an embodiment of the present invention. 
       FIG. 6  depicts a portion of the electrical power system of  FIG. 5  in greater detail in accordance with an embodiment of the present invention. 
       FIG. 7  depicts a networked power demultiplexer device in accordance with an embodiment of the present invention. 
   

   DETAILED DESCRIPTION 
     FIG. 1  is a perspective view of a notebook or laptop computer  10  in accordance with an embodiment of the invention. The laptop computer  10  includes a display panel  11  and a chassis  12 . The chassis  12  includes a rechargeable battery  13 . The display panel  11  includes a display screen  16  of some type, such as an LCD display screen, and also has mounted therein a light source  15  for delivering light as is known in the art. The chassis  12  also includes an Ethernet-type connector or jack  17 . The Ethernet-type connector  17  is shown located at one side of the chassis  12 , but the connector may be located at the opposite side or at the back of the chassis  12  (or at other locations of the laptop computer  10 ) in alternate embodiments. The Ethernet-type connector  17  is the port into which one end of an Ethernet cable  18  (shown in  FIG. 2 ) is inserted. The Ethernet cable  18  connects the laptop computer  10  to a network  19  (shown in  FIG. 2 ) of computer systems and/or other networkable devices. There is also a conventional power connector  21  (shown in  FIG. 2 ) typically located on the back edge of the chassis  12 . 
     FIG. 2  is a block diagram of the electrical power system of the laptop computer  10  of  FIG. 1  in accordance with an embodiment of the present invention. As shown, the computer  10  (which typically includes a microprocessor as CPU, associated chipset, display screen, and other logic) is capable of receiving power from multiple sources. 
   The notebook computer  10  is configured to be connected (via a conventional power connector  21  and a conventional cable  22 ) to a conventional power adaptor  23 . The power adaptor  23  is connected to and receives power from a conventional external power source (for example, a wall socket). The power adaptor  23  performs any power conversions that may be necessary (for example, going from 110 volts AC to 15 volts DC), and the motherboard switching regulator of the computer  10  is then supplied powered by this external source. At the same time, the rechargeable battery  13  may also be recharged (if necessary) by the external power source (via the charging regulator circuit  20 ). And when the external power source is not available, the computer  10  is powered by the rechargeable battery  13 . 
   In accordance with an embodiment of the present invention, the laptop computer  10  is further configured to receive power from the Ethernet network  19  by way of the Ethernet-type connector  17  and the Ethernet cable  18 . In this case, the Ethernet cable  18  includes, in addition to data communications related lines, a pair of lines delivering electrical power. In one specific embodiment, a spare pair of lines (not used for data transmission by 10 Base-T or 100 Base-T Ethernet) in the Ethernet cable  18  is utilized to transmit the power. In another specific embodiment, a pair of the data lines are used to transmit the power (for example, at 50 volts DC), in addition to or instead of transmitting data. The power received from the network  19  may be used to recharge the battery  13 . 
     FIG. 3  depicts a portion of the electrical power system of  FIG. 2  in greater detail in accordance with an embodiment of the present invention. As depicted in  FIG. 3 , the Ethernet connector  17  may be configured to connect to both power lines  32  and data lines  34  within the notebook computer  10 . In a particular embodiment, the power lines  32  connect to the battery charging regulator  20  by way of power sensing and voltage step-down circuitry  36 . The power sensing circuitry is configured to sense whether or not the Ethernet connection provides power (in addition to or instead of data communications). If the power sensing circuitry determines power is not being provided, then the power lines may be kept disconnected from the charging regulator  20 . The voltage step-down circuitry is configured to reduce the higher voltage level (for example, 50 volts) supplied by the Ethernet connection to a lower voltage level (for example, 15 volts) for the input to the charging regulator  20 . Depending on the particular implementation, the power sensing and/or voltage step-down circuitry may be optional. 
     FIG. 4  is a perspective view of a notebook or laptop computer  40  in accordance with another embodiment of the invention. The laptop computer  40  includes a display panel  11  and a chassis  12 . The chassis  12  includes a rechargeable battery  13 . The display panel  11  includes a display screen  16  of some type, such as an LCD display screen, and also has mounted therein a light source  15  for delivering light as is known in the art. The chassis  12  also includes a first Ethernet-type connector or jack  17  and a second Ethernet-type connector or jack  47 . Both Ethernet-type connectors  17  and  47  are shown located at one side of the chassis  12 , but these connectors  17  and  47  may be located at the opposite side or at the back of the chassis  12  (or at other locations of the laptop computer  10 ) in alternate embodiments. In accordance with an embodiment on the invention, while the first Ethernet connector  17  is designated for networking and/or power, the second Ethernet connector  47  is designated for power only. 
   The first Ethernet-type connector  17  is the port into which one end of a first Ethernet cable  18  (shown in  FIG. 5 ) is inserted. This first Ethernet cable  18  connects the laptop computer  10  to a network  19  (shown in  FIG. 5 ) of computer systems and/or other networkable devices. The network  19  may or may not be configured to supply power (for example, at 50 volts DC). 
   The second Ethernet-type connector  47  is the port into which one end of a second Ethernet cable  48  (shown in  FIG. 5 ) is inserted. This second Ethernet cable  48  may connect the laptop computer  10  to a power adaptor (sometimes called a power “brick” because of its shape)  49 . This power adaptor  49  is specially configured with an Ethernet-compatible output so as to be able to deliver power (for example, at 15 volts DC) via the Ethernet cable  48 . The other end (not illustrated) of the power adaptor  49  may be connected to and receives power from a conventional external power source (for example, a wall socket supplying 110 volts AC). 
   Alternatively, this second Ethernet cable  48  may connect the laptop computer  10  to an Ethernet network that supplies supplemental power (for example, at 50 volts DC). The Ethernet network may be the same as the network  19  connected to the first connector  17  or it may be a different network. 
     FIG. 5  is a block diagram of the electrical power system of the laptop computer  40  of  FIG. 4  in accordance with an embodiment of the present invention. As shown, the computer  40  (which typically includes a microprocessor as CPU, associated chipset, display screen, and other logic) is capable of receiving power from multiple sources. 
   In accordance with an embodiment of the present invention, the laptop computer  40  is configured to receive power from an Ethernet network  19  by way of the first Ethernet-type connector  17  and Ethernet cable  18 . In this case, the first Ethernet cable  18  includes, in addition to data communications related lines, a pair of lines delivering electrical power. In one specific embodiment, a spare pair of lines (not used for data transmission by 10 Base-T or 100 Base-T Ethernet) in the Ethernet cable  18  is utilized to transmit the power. In another specific embodiment, a pair of the data lines are used to transmit the power (in addition to transmitting data). The power received from the network  19  may be used to recharge the battery  13 . 
   In accordance with an embodiment of the present invention, the notebook computer  40  is further configured to be connected (via the second Ethernet-type connector  47  and Ethernet cable  48 ) to a special power adaptor  49  that is configured with an Ethernet-compatible output. The special power adaptor  49  is connected to and receives power from a conventional external power source (for example, a wall socket) and outputs converted power via the Ethernet-compatible output. The power adaptor  49  performs any power conversions that may be necessary (for example, going from 110 volts AC to 15 volts DC, or going from 110 volts AC to 50 volts DC), and the computer  40  is then powered by this external source. At the same time, the rechargeable battery  13  may also be recharged (if necessary) by the external power source (via the charging regulator circuit  20 ). 
   In accordance with one embodiment, if power via such an adaptor  49  is not available (for example, a user did not bring the adaptor  49  or a wall socket is not available), then the user may alternatively connect the second Ethernet connector  47  to receive supplemental power (for example, at 50 volts DC) from an Ethernet network (either the same network  19  as connected to the first connector  17  or a different network). The supplemental power may be used to recharge the battery  13 . 
     FIG. 6  depicts a portion of the electrical power system of  FIG. 5  in greater detail in accordance with an embodiment of the present invention. 
   As depicted in  FIG. 6 , the first Ethernet connector  17  is configured to connect to both power lines  32  and data lines  34  within the notebook computer  40 . In a particular embodiment, the power lines  32  connect to the battery charging regulator  20  by way of power sensing and voltage step-down circuitry  36 . The power sensing circuitry is configured to sense whether or not the Ethernet connection provides power (in addition to or instead of data communications). If the power sensing circuitry determines power is not being provided, then the power lines may be kept disconnected from the charging regulator  20 . The voltage step-down circuitry is configured to reduce the higher voltage level (for example, 50 volts) supplied by the Ethernet connection to a lower voltage level (for example, 15 volts) for the input to the charging regulator  20 . Depending on the particular implementation, the power sensing and/or voltage step-down circuitry may be optional. In addition, signature circuitry may be included in the system so as to send a “signature” to the network to let the network know that the laptop computer can receive power via the network connection and also how much power is wanted-by the laptop computer. 
   As further depicted in  FIG. 6 , the second Ethernet-type connector  47  is configured to connect to the charging regulator  20  by way of voltage sensing and switching circuitry  62  and voltage step-down circuitry  64 . The voltage-sensing circuitry is configured to sense or determine whether power is being supplied at a higher voltage level (for example, at 50 volts DC from a network) that needs to be stepped-down, or at a lower voltage level (for example, at 15 volts DC from a special power adaptor  49 ) that does not need to be stepped down. If the voltage supplied needs stepping-down, then the power may be switched by the switching circuitry to go through the voltage step-down circuitry  64 . Otherwise, If the voltage supplied does not need stepping-down, then the power may be switched by the switching circuitry to bypass the step-down circuitry  64  and go directly to the charging regulator  20  (and also to the motherboard switching regulator of the laptop  40 ). Depending on the particular implementation, the above-discussed additional circuitry may be optional. 
   In an alternate embodiment, a same or similar voltage level is provided by the special power adaptor  49  as the voltage level provided by a network port (for example, approximately 50 volts). In this embodiment, the voltage-sensing and switching circuitry  62  is not needed. Instead, the voltage step-down circuitry  64  may be configured between the second Ethernet-type connector  47  and charging regulator  20  (without the voltage-sensing and switching circuitry  62 ). 
     FIG. 7  depicts a networked power demultiplexer device  700  in accordance with an embodiment of the invention. The networked power demultiplexer device  700  includes an input  702  configured to connect to networked power. As such, the input  702  may receive both network signals and power. The device  700  further includes a first output  704  configured to provide the network signals to a conventional network port of a portable computer system and a second output  706  configured to provide DC power at a predetermined voltage level to a conventional DC power input of the portable computer system. The device  700  includes demultiplexer circuitry  708  configured to direct the network signals from the input  702  to the first output  704  and to direct the power from the input  702  to the second output  706 . In addition, the adaptor device  700  may include voltage-conversion circuitry  710  configured to convert the DC power input to a pre-determined voltage level that is compatible with the power input of the portable computing device. Such a networked power demultiplexer device  700  is advantageously backward-compatible with existing laptop computers. 
   In one embodiment of the invention, a laptop computer is configured to receive external power (from one or more connections to a network supplying power) that is insufficient to fully power the laptop computer (which may require, for example, 80 watts to fully power). Although the external power received (for example, 15 watts per network connection) is insufficient to fully power the laptop computer, the external power is utilized to provide some recharging of the battery  30  such that the time period that the battery  30  may power the laptop computer is extended. For example, if a battery  30  normally would provide 3 hours of laptop operation, this method may enable the operation time to be advantageously extended to 4 hours, for example. Furthermore, if the laptop computer is idle or sleeping or hibernating or powered off, then the laptop computer could charge. For example, the laptop device may be left plugged into the network over night so that it may be fully charged the next morning. 
   In an embodiment of the invention, the power delivered by a network may be compatible with IEEE 802.3af (sometimes referred to as “Power over Ethernet” or PoE). The Ethernet cable may comprise, for example, Category-5 or other cable, and the Ethernet-type connector may comprise an RJ45 or other connector. 
   Although the above discussion focuses on recharging a laptop computer, alternate embodiments of the invention may involve adaptation of the invention so as to recharge a tablet or palmtop computer, or even personal digital assistant (PDA) devices. 
   In the above description, numerous specific details are given to provide a thorough understanding of embodiments of the invention. However, the above description of illustrated embodiments of the invention is not intended to be exhaustive or to limit the invention to the precise forms disclosed. One skilled in the relevant art will recognize that the invention can be practiced without one or more of the specific details, or with other methods, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring aspects of the invention. While specific embodiments of, and examples for, the invention are described herein for illustrative purposes, various equivalent modifications are possible within the scope of the invention, as those skilled in the relevant art will recognize. 
   These modifications can be made to the invention in light of the above detailed description. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification and the claims. Rather, the scope of the invention is to be determined by the following claims, which are to be construed in accordance with established doctrines of claim interpretation.