Abstract:
A power control device includes a connector, a detecting module, a control module, a first output module, a second output module, a first switch module, and a second switch module. The detecting module measures a current and outputs different signals according to a comparison result between the current and a preset value. The first output module and the second output module are selectively used to supply power for the connector according to a value of the current.

Description:
FIELD 
       [0001]    The subject matter herein generally relates to a power control device. 
       BACKGROUND 
       [0002]    A motherboard supplies power for loads of different voltages via a connector. 
     
    
     
       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 power control device. 
           [0005]      FIG. 2  is a circuit diagram of part of the power control device in  FIG. 1 . 
           [0006]      FIG. 3  is a circuit diagram of another part of the power control device in  FIG. 1 . 
       
    
    
     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 have been 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]    The present disclosure is described in relation to an embodiment of a power control device  10 . 
         [0011]      FIG. 1  illustrates the power control device  10 . The power control device  10  can comprise a connector  20 , a detecting module  30 , a control module  40 , a first output module  50 , a second output module  60 , a first switch module  70 , and a second switch module  80 . The detecting module  30  is used to measure a current through the connector  20 . When the current is not greater than a preset value, the detecting module  30  outputs a first signal. When the current is greater than the preset value, the detecting module  30  outputs a second signal. The control module  40  is coupled to the detecting module  30 . When the control module  40  receives the first signal, the control module  40  outputs a first control signal. When the control module  40  receives the second signal, the control module  40  outputs a second control signal. The second output module  60  outputs a first enable signal when the second output module  60  receives the first control signal. The second output module  60  outputs a second enable signal when the second output module  60  receives the second control signal. The first output module  50  is coupled to the connector  20  through the first switch module  70  when the first switch module  70  receives the first enable signal. The second output module  60  is coupled to the connector  20  through the second switch module  80  when the second switch module  80  receives the second enable signal. 
         [0012]      FIG. 2  illustrates a circuit diagram of an embodiment of the second output module  60 . The second output module  60  can comprise a chip U 1 , an inductor L 1 , an inductor L 2 , resistors R 0 -R 13 , and capacitors C 1 -C 13 . The chip U 1  can comprise input pins VIN 1 -VIN 7 , which are coupled to a power terminal P 12 V 3  through the inductor L 1 . The power terminal P 12 V 3  is grounded through the capacitor C 1 . The input pin VIN 1  is grounded through the capacitor C 2 . Capacitors C 3 -C 5  are connected in parallel with the capacitor C 2 . A power pin VREG is coupled to a power good pin PGOOD through the resistor R 1 . The power good pin PGOOD is coupled to the first switch module  70  and the second switch module  80 . The power pin VREG is grounded through the resistor R 2  and the resistor R 3  in that order. The power pin VREG is grounded through the capacitor C 6 . A mode pin MODE of the chip U 1  is grounded through the resistor R 4 . An enable pin EN of the chip U 1  is coupled to the control module  40  through the resistor R 5 . The enable pin EN of the chip U 1  is coupled to a power terminal P 3 V 3  through the resistor R 6 . An adjusting pin RF of the chip U 1  is coupled to a node between the resistor R 2  and the resistor R 3 . A temperature pin TRIP is grounded through the resistor R 7 . A power pin VBST of the chip U 1  is coupled to an output pin LL 1  of the chip U 1  through the resistor R 8  and the capacitor C 7  in that order. Output pins LL 2 -LL 6  are coupled to the output pin LL 1 . The output pin LL 1  is also grounded through the resistor R 9 , the resistor R 10 , and the capacitor C 8  in that order. The output pin LL 1  is also grounded through the resistor R 11 , the capacitor C 9 , and the resistor R 12  in that order. The output pin LL 1  is coupled to a power terminal P 5 V_OUT through the inductor L 2 . The power terminal P 5 V_OUT is coupled to a node between the resistor R 11  and the capacitor R 9  through the capacitor C 10 . The power terminal P 5 V_OUT is coupled to a power pin VFB of the chip U 1  through the resistor R 13  and the resistor R 0  in that order. The power terminal P 5 V_OUT is grounded through the capacitor C 11 . The capacitor C 12  and the capacitor C 13  are coupled in parallel with the capacitor C 11 . A float pin NC of the chip U 1  is float. A ground pin EPAD of the chip U 1  is grounded. The chip U 1  receives the second control signal from the control module  40  through the enable pin EN. 
         [0013]    The chip U 1  receives a voltage of 12V from the power terminal P 12 V 3 . The chip U 1  converts the voltage of 12V into a voltage of 5V and outputs the voltage of 5V to the power terminal P 5 V_OUT. The chip U 1  outputs the second enable signal through the power good pin PGOOD when the chip U 1  receives the second control signal. The chip U 1  outputs the first enable signal through the power good pin PGOOD when the chip U 1  receives a first control signal. In the embodiment, the first enable signal is a low level signal, such as logic 0. The second enable signal is a high level signal, such as logic 1. 
         [0014]      FIG. 3  illustrates a circuit diagram of an embodiment of the power control device without the second output module  60 . The first output module  50  can comprise a fuse FS 1 , capacitors C 14 -C 16 , resistors R 14 -R 15 , and an inductor L 3 . A first terminal of the inductor L 3  is coupled to a power terminal P 5 V_A through the fuse FS 1 . The first terminal of the inductor L 3  is also grounded through the capacitor C 14 . The capacitor C 15  and the capacitor C 14  are coupled in parallel. The first terminal of the inductor L 3  is grounded through the resistor R 14  and the resistor R 15  in that order. A second terminal of the inductor L 3  is coupled to the first switch module  70  and a power terminal P 5 V_B. The second terminal of the inductor L 3  is grounded through the capacitor C 16 . 
         [0015]    The first switch module  70  can comprise an electronic switch Q 1 , an electronic switch Q 2 , and a resistor  16 . A first terminal of the electronic switch Q 1  is coupled to the power good pin PGOOD of the chip U 1 . A second terminal of the electronic switch Q 1  is coupled to the power terminal P 12 V_ 3  through the resistor R 16 . A third terminal of the electronic switch Q 1  is grounded. A first terminal of the electronic switch Q 2  is coupled to the second terminal of the electronic switch Q 1 . A second terminal of the electronic switch Q 2  is coupled to the second terminal of the inductor L 3 . A third terminal of the electronic switch Q 2  is coupled to the second switch module  80 , the detecting module  30 , and the connector  20 . 
         [0016]    The second switch module  80  can comprise an electronic switch Q 3 , an electronic switch Q 4 , an electronic switch Q 5 , a resistor R 17 , and a resistor R 18 . A first terminal of the electronic switch Q 3  is coupled to a second terminal of the electronic switch Q 4 . A second terminal of the electronic switch Q 3  is coupled to a power terminal P 5 V_OUT. A third terminal of the electronic switch Q 3  is coupled to the third terminal of the electronic switch Q 2 . A first terminal of the electronic switch Q 4  is coupled to a second terminal of the electronic switch Q 5 . The second terminal of the electronic switch Q 4  is coupled to the power terminal P 2 V_ 3  through the resistor R 18 . A third terminal of the electronic switch Q 4  is grounded. The power terminal P 12 V_ 3  is also coupled to the first terminal of the electronic switch Q 4  through the resistor R 17 . The power terminal P 12 V_ 3  is also coupled to the second terminal of the electronic switch Q 5  through the resistor R 17 . A first terminal of the electronic switch Q 5  is coupled to the power good pin PGOOD. A third terminal of the electronic switch Q 5  is grounded. 
         [0017]    The connector  20  can comprise a resistor  19 , a capacitor C 17 , a capacitor C 18 , a capacitor C 19 , and a universe serial bus (USB) connector  21 . A first terminal of the resistor R 19  is coupled to the third terminal of the electronic switch Q 2  and the third terminal of the electronic switch Q 3 . A second terminal of the resistor R 19  is grounded through the capacitor C 17 . The capacitor C 18  and the capacitor C 19  are coupled in parallel with the capacitor C 17 . The second terminal of the resistor R 19  is coupled to a power terminal P 5 V_USB. The second terminal of the resistor R 19  is coupled to a power pin VCC of the USB connector  21 . A ground pin MH 1 , a ground pin MH 2 , and a ground pin GND of the USB connector  21  are grounded. 
         [0018]    The detecting module  30  can comprise a chip U 2  and a capacitor C 20 . A ground pin GND, a ground pin A 1 , and a ground pin A 0  of the chip U 2  are grounded. A power pin VS of the chip U 2  is coupled to a power terminal P 5 V_C. A detecting pin VIN+ is coupled to the first terminal of the resistor R 19 . A detecting pin VIN- is coupled to the second terminal of the resistor R 19 . A data pin SDA of the chip U 2  and a clock pin SCL of the chip U 2  are coupled to the control module  40 . The capacitor C 20  is coupled between the power pin VS of the chip U 2  and ground. 
         [0019]    In use, the second output module  60  outputs a low level signal, such as logic 0, through the power good pin PGOOD by default. The first terminal of the electronic switch Q 1  receives the low level signal. The electronic switch Q 1  is deactivated. The power terminal P 12 V_ 3  is coupled to the first terminal of the electronic switch Q 2  through the resistor R 16 . The electronic switch Q 2  is activated. The first output module supplies power to the USB connector  21  through the electronic switch Q 2 . The first terminal of the electronic switch Q 5  is at a low level. The electronic switch Q 5  is deactivated. The power terminal P 12 V_ 3  is coupled to the first terminal of the electronic switch Q 4  through the resistor R 17 . The electronic switch Q 4  is activated. A first terminal of the electronic switch Q 3  is at a low level. The electronic switch Q 3  is deactivated. The second output module  60  cannot supply power to the USB connector  21  through the second switch module  80 . 
         [0020]    The chip U 2  measures a voltage across the resistor R 19 . When the voltage is not greater than a preset value, the chip U 2  outputs a first signal to the control module  40 . The control module  40  outputs a first control signal to the enable pin EN of the chip U 1 . The chip U 1  receives the first control signal and outputs the first enable signal through the power good pin PGOOD. The first enable signal is at a low level. When the voltage is greater than the preset value, the chip U 2  outputs a second signal to the control module  40 . The control module  40  output a second control signal to the enable pin EN of the chip U 1 . The chip U 1  receives the second control signal and outputs a second enable signal through the power good pin PGOOD. The second enable signal is at a high level. 
         [0021]    When the chip U 1  outputs the second enable signal through the power good pin PGOOD, the first terminal of the electronic switch Q 1  is at a high level and the electronic switch Q 1  is activated. The power terminal P 12 V_ 3  is grounded through the resistor R 16 . A first terminal of the electronic switch Q 2  is at a low level. The electronic switch Q 2  is deactivated. The first output module  50  cannot supply power to the USB connector  21  through the electronic switch Q 2 . The first terminal of the electronic switch Q 5  is at a high level and the electronic switch Q 5  is activated. The power terminal P 12 V_ 3  is grounded through the resistor R 17 . The electronic switch Q 4  is deactivated. A first terminal of the electronic switch Q 3  is at a high level. The electronic switch Q 3  is activated. The second output module  60  supplies power to the USB connector  21  through the electronic switch Q 3 . 
         [0022]    In the embodiment, the control module is a basic input output system. The first output module  50  can provide a current with a maximum of 500 MA. The second output module  60  can provide a current with a maximum of 5 A. 
         [0023]    In the embodiment, the electronic switch Q 1 , the electronic switch Q 4 , and the electronic switch Q 5  are NPN transistors. The electronic switch Q 2  and the electronic switch Q 3  are n-channel field effect transistors. 
         [0024]    The embodiments shown and described above are only examples. Many details are often found in the art such as the other features of a power control device. 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.