Abstract:
A hand-held computer interface includes a body having an exterior surface and defining an interior space, a hand controlled computer input device contained substantially within the body interior space, a heating unit positioned within the interior space, a control unit positioned within the body, the control unit having a control pin and at least one output pin coupled to the heating unit, and a switch unit positioned within the body, the switch unit coupled to the control pin. The switch unit has two or more switch positions and at least one of the two or more switch positions activates the control unit to supply electrical power to the heating unit. When electrical power is supplied to the heating unit, the exterior surface of the body is heated.

Description:
FIELD 
       [0001]    The subject matter herein generally relates to a hand-held computer interface with a heating circuit therein. 
       BACKGROUND 
       [0002]    Some hand-held computer interfaces, such as computer mouses, a heated computer mouse pad or computer mouse sheath is generally used to prevent a cold feeling when users touch a computer mouse in winter. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0003]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0004]      FIG. 1  is a block diagram of an embodiment of a hand-held computer interface in a computer mouse. 
           [0005]      FIG. 2  is a circuit diagram of an embodiment of a heating circuit in the hand-held computer interface of  FIG. 1 . 
           [0006]      FIG. 3  is a circuit diagram of the heating circuit of  FIG. 2  coupled to a USB connector. 
       
    
    
     DETAILED DESCRIPTION 
       [0007]    It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
         [0008]    Several definitions that apply throughout this disclosure will now be presented. 
         [0009]    The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like. 
         [0010]      FIG. 1  illustrates a hand-held computer interface in accordance with an embodiment. The hand-held computer interface can include a body  100  having an exterior surface and defining an interior space, a hand controlled computer input device  200  contained substantially within the body interior space, and a heating circuit  300  positioned within the interior space. In at least one embodiment, the hand-held computer interface is a computer mouse. 
         [0011]    The heating circuit  300  can include a control unit  10 , a switch unit  20 , and a heating unit  30 . 
         [0012]      FIG. 2  and  FIG. 3  illustrate that the control unit  10  has a control pin  1 , a first output pin  2 , a second output pin  3 , a third output pin  5 , and a power pin  6 . 
         [0013]    The power pin  6  is configured to receive a +5V operation voltage. In at least one embodiment, the operation voltage is from a power port of a USB connector of the computer mouse. The power port receives an output voltage output from a motherboard of an electronic device. The computer mouse can be coupled to the electronic device via the USB connector. The control unit  10  is coupled to the USB connector via a USB bus. 
         [0014]    The control pin  1  is coupled to the switch unit  20 . The switch unit  20  is configured to switch the heating unit  30  on/off. The switch unit  20  can include an off port  21 , a low temperature port  22 , a middle temperature port  23 , and a high temperature port  25 . When the switch unit  20  switches on the low temperature port  22  or the middle temperature port  23  or the high temperature port  25 , the heating unit  30  is switched on. When the switch unit  20  switches on the off port  21 , the heating unit  30  is switched off. In at least one embodiment, the switch unit  20  is a paddle switch. 
         [0015]    The heating unit  30  can include a first heating resistor R 1 , a second heating resistor R 2 , a third heating resistor R 3 , a first field-effect tube (FET) Q 1 , a second FET Q 2 , and a third FET Q 3 . 
         [0016]    A first port of the first resistor R 1  is grounded, a second port of the first resistor R 1  is coupled to the drain electrode D of the first FET Q 1 . The grid electrode G of the first FET Q 1  is coupled to the first output pin  2 . The source electrode S of the first FET Q 1  is coupled to the power port. 
         [0017]    A first port of the second resistor R 2  is grounded, a second port of the second resistor R 2  is coupled to the drain electrode D of the second FET Q 2 . The grid electrode G of the second FET Q 2  is coupled to the second output pin  3 . The source electrode S of the second FET Q 2  is coupled to the power port. 
         [0018]    A first port of the third resistor R 3  is grounded, a second port of the third resistor R 3  is coupled to the drain electrode D of the third FET Q 3 . The grid electrode G of the third FET Q 3  is coupled to the third output pin  5 . The source electrode S of the third FET Q 3  is coupled to the power port. 
         [0019]    When the switch unit  20  switches on the low temperature port  22 , the control pin  1  sends out a control signal to control the first output pin  2  to output a high level voltage, and the second output pin  3  and the third output pin  5  outputs a low level voltage. Thus, the first FET Q 1  is switched on, and the second FET Q 2  and the third FET Q 3  are switched off. The first heating resistor R 1  is operated to generate heat in the computer mouse, enabling a palm touching the computer mouse to feel warm. 
         [0020]    When the switch unit  20  switches on the middle temperature port  23 , the control pin  1  sends out a control signal to control the first output pin  2  and the second output pin  3  to output a high level voltage, and the third output pin  5  outputs a low level voltage. Thus, the first FET Q 1  and the second FET Q 2  are switched on, and the third FET Q 3  is switched off. The first heating resistor R 1  and the second heating resistor R 2  are operated to generate heat in the computer mouse. In this position, the first resistor R 1  is coupled to the second resistor R 2  in parallel, a total resistance R 0  is smaller than R 1 , according to the power formula P=U 2 /R, a heating power is greater than that when the switch unit  20  switches on the low temperature port  21 . 
         [0021]    When the switch unit  20  switches on the high temperature port  25 , the control pin  1  sends out a control signal to control the first output pin  2 , the second output pin  3 , and the third output pin  5  to output a high level voltage. Thus, the first FET Q 1 , the second FET Q 2 , and the third FET Q 3  are switched on. The first heating resistor R 1 , the second heating resistor R 2 , and the third heating resistor R 3  are operated to generate heat in the computer mouse. In this position, the first resistor R 1 , the second resistor R 2 , and the third resistor R 3  are coupled to each other in parallel, a total resistance is smaller than R 0 , according to the power formula P=U 2 /R, a heating power is greater than that when the switch unit  20  switches on the middle temperature port  23 . 
         [0022]    When the switch unit  20  switches on the off port  21 , the control pin  1  sends out a control signal to control the first output pin  2 , the second output pin  3 , and the third output pin  5  to output a low level voltage. Thus, the first FET Q 1 , the second FET Q 2 , and the third FET Q 3  are switched off. The first heating resistor R 1 , the second heating resistor R 2 , and the third heating resistor R 3  are not operated to generate heat in the computer mouse. 
         [0023]    The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a hand-held computer interface and a heating circuit. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.