Abstract:
Detecting circuit for a plurality fans includes a plurality of detecting units, a connection unit, a processing unit, and a plurality of indicating units whose number equals the number of the detecting units. The detecting units detect whether the fans have been properly installed and then output detection signals. The connection unit transfers the detection signals to the processing unit. The processing unit processes the detection signals and outputs judgment signals. The indicating units indicate installation states of the fans according to the judgment signals.

Description:
FIELD 
       [0001]    The present disclosure relates to a detecting circuit for fans installation of a server. 
       BACKGROUND 
       [0002]    An electronic device, such as a server can use fans to cool off. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         [0003]    Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the presented embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0004]      FIG. 1  is a block diagram of an embodiment of a detecting circuit. 
           [0005]      FIG. 2  and  FIG. 3  are circuit diagrams of an embodiment of a detecting circuit. 
       
    
    
     DETAILED DESCRIPTION 
       [0006]    The disclosure, including the figures, is illustrated by way of example and not by way of limitation. References to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one”. Although discussion herein is directed to a server, it will be understood the principles described can be utilized with other e-devices. 
         [0007]      FIG. 1  illustrates an embodiment of a detecting circuit for detecting and indicating installation states of fans in a server. In the embodiment, the detecting circuit can comprise a plurality of detecting units  10 , a connection unit  20 , a processing unit  30 , and a plurality of indicating units  40  whose number corresponds to the number of the detecting units  10 . 
         [0008]    In at least one embodiment, each of the detecting units  10  is located on a bottom of a fan mounting groove  100  in the server, for detecting whether the fans are installed in the fan mounting grooves  100  and outputting detecting signals. The connection unit  20  is connected to the detecting units  10  for receiving the detecting signals and outputting the detecting signals. The processing unit  30  is connected to the connection unit  20  for receiving the detecting signals and outputting judgment signals according to the detecting signals. The indicating units  40  are connected to the processing unit  30  for receiving the judgment signals and indicate the installation states of the fans. 
         [0009]    In at least one embodiment, the number of the detecting units  10  is six, and accordingly, the number of the indicating units  40  is six. 
         [0010]      FIG. 2  illustrates the six detecting units  10  located on the bottom of fan mounting grooves  100  of the detecting circuit. Each of the detecting units  10  can comprise a switch SW 1 , a resistor R 1 , and a connector J 1 . A first terminal of the switch SW 1  is connected to a power source P 5 V through the resistor R 1 . The first terminal of the switch SW 1  is connected to a signal pin FAN of the connector J 1 . A second terminal of the switch SW 1  is connected to a grounded pin GND of the connector J 1  and grounded. 
         [0011]      FIG. 3  illustrates the connection unit  20 , the processing unit  30 , and the six indicating units  40  of the detecting circuit. The connection unit  20  comprises a connector J 7 . The connector J 7  comprises output pins FAN 1 -FANG connected to the signal pins FAN of each of the connectors J 1  and grounded pins GND 1 -GND 6  connected to a ground. The processing unit  30  comprises a single-chip U 1  and resistors R 13 -R 18 . The single-chip U 1  comprises input pins RA 0 -RA 5  connected to the output pins FAN 1 -FAN 6  of the connector J 7  through the resistors R 13 -R 18  respectively, power pins VDD and VPP connected to the power source P 5 V, ground pins VSS 1  and VSS 2  connect to a ground, and output pins RC 0 -RC 5  connected to the indicating units  40  respectively. Each of the indicating units  40  comprises a resistor R 7  and a light emitting diode (LED) D 1 . Cathodes of the LEDs D 1  are connected to the output pins RC 0 -RC 5  of the single-chip U 1  through the resistor R 7  respectively. Anodes of the LEDs D 1  are connected to the power source P 5 V. 
         [0012]    When the first fan is installed in first fan mounting groove  100  properly, the switch SW 1  in the first fan mounting groove  100  is pressed by the first fan and is thereby turned on. The signal pin FAN of the connector J 1  in the first fan mounting groove  100  is connected to a ground through the switch SW 1 . The output pin FAN 1  of the connector J 7 , which is connected to the signal pin FAN, outputs a low-level signal, such as logic 0, to the input pin RA 0  of the single-chip U 1 . Since the input pin RA 0  of the single-chip U 1  received a low-level signal, the output pin RC 0  of the single-chip U 1  does not output a corresponding signal, and the LED D 1  of the first indicating unit  40  cannot be lit, which indicates the first fan is installed in the first fan mounting groove  100  properly. 
         [0013]    When the first fan installed in the first fan mounting groove  100  is not installed properly in position, the switch SW 1  in the first fan mounting groove  100  is not pressed by the first fan and is thereby turned off. The signal pin FAN of the connector J 1  is connected to the power source P 5 V through the resistor R 1 . The output pin FAN 1  of the connector J 7 , which is connected to the signal pin FAN, outputs a high-level signal, such as logic 1, to the input pin RA 0  of the single-chip U 1 . Since the input pin RA 0  of the single-chip U 1  received a high-level signal, the output pin RC 0  of the single-chip U 1  outputs a low-level signal corresponding, and the LED D 1  of the first indicating unit  40  is lit, which indicates the first fan installed in the first fan mounting groove  100  is not installed properly in position. 
         [0014]    As detailed above, the connector J 7  connected with the fan mounting grooves  100  outputs the detecting signals to the single-chip U 1 . The single-chip U 1  controls the LEDs D 1  to be lit or not, to indicate the fan installation state according to the detecting signals received. 
         [0015]    Even though numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the structure and function of the disclosure, the disclosure is illustrative only, and changes can be made in detail given, including matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.