Abstract:
A temperature control system for a test chamber includes a control circuit, a temperature increasing circuit, and a temperature decreasing circuit. The control circuit detects a temperature in the test chamber, compares the temperature with a predetermined temperature, and outputs a first control signal when the temperature is lower than the predetermined temperature. The temperature increasing circuit receives the first control signal, and heats the test chamber in accordance therewith. The control circuit outputs a second control signal to the temperature when the temperature in the test chamber is higher than the predetermined temperature, the temperature decreasing circuit receives the second control signal, and cool the test chamber according to the second control signal to decrease the temperature in the test chamber.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to Chinese Patent Application No. 201410070247.0 filed on Feb. 28, 2014, the contents of which are incorporated by reference herein. 
       FIELD 
       [0002]    The subject matter herein generally relates to a temperature control system. 
       BACKGROUND 
       [0003]    The performance of electrical devices such as computers, servers, notebooks and so on at different temperatures (thermal performance) is a significant concern. Thermal performance reflects an operational state of the electrical device in different temperature environments. When the thermal performance of an electrical device is tested, a simulation of different temperature environments is needed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0004]    Implementations of the present technology will now be described, by way of example only, with reference to the attached figures. 
           [0005]      FIG. 1  is a block diagram of an embodiment of a temperature control system. 
           [0006]      FIG. 2  is a circuit diagram of the temperature control system of  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]      FIG. 1  illustrates a temperature control system for a test chamber  100  in accordance with an embodiment. The temperature control system includes a control circuit  10 , a temperature increasing circuit  20 , a temperature decreasing circuit  30 , and an illuminating circuit  40 . 
         [0011]      FIG. 2  illustrates the control circuit  10  includes a fuse F, a first switch S 1 , a power supply  11 , a relay member, and a temperature controller  12 . The power supply  11  includes a first power input terminal P 0 , a first power output terminal P 1 , a second power output terminal P 2 , a third power output terminal P 3 , a control signal input terminal P 4 , and a first ground terminal P 5 . The temperature controller  12  includes a second power input terminal J 0 , a control signal output terminal J 1 , and a second ground terminal J 2 . The relay member includes a winding unit M and a switch unit K. The switch unit K includes a first terminal, a second terminal, and a third terminal. 
         [0012]    A first terminal of the fuse F receives an AC voltage. A second terminal of the fuse F is electrically coupled to a first terminal of the first switch  51 . A second terminal of the first switch S 1  is electrically coupled to the first power input terminal P 0  and the second power input terminal J 0 . The first power output terminal P 1  is electrically coupled to the winding unit M. 
         [0013]    The second power output terminal P 2  is electrically coupled to the first terminal of the switch unit K. The second terminal of the switch unit K is ideal. The control signal output terminal J 1  is electrically coupled to the control signal input terminal P 4 . The second ground terminal J 2  is electrically coupled to the first ground terminal P 5 . 
         [0014]    The temperature increasing circuit  20  includes a number of resistors R 1 -R 4 , a number of lamps A 1 -A 4 , two first fans F 1 , F 2 , and two second switches S 2 , S 3 . First terminals of the first fan F 1 , the number of resistors R 1 -R 4 , and the second switches S 2 , S 3  are electrically coupled to the third power output terminal P 3 . A second terminal of the first fan F 1  is grounded via the first fan F 2 . Second terminals of the number of resistors R 1 -R 4  are grounded. A second terminal of the second switch S 2  is grounded via the lamps A 1  and A 2  connected in series. A second terminal of the second switch S 3  is grounded via the lamps A 3  and A 4  connected in series. In at least one embodiment, the number of resistors R 1 -R 4  are heating resistors. The number of lamps A 1 -A 4  are incandescent lamps. The two first fans F 1 , F 2  are located at a bottom of the test chamber  100 . 
         [0015]    The temperature decreasing circuit  30  includes a second fan TF and a number of third fans BF 1 -BF 4 . First terminals of the second fan TF and the third fans BF 1 , BF 3  are electrically coupled to the third terminal of the switch unit K. A second terminal of the second fan TF is grounded. A second terminal of the third fan BF 1  is grounded via the third fan BF 2 . A second terminal of the third fan BF 3  is grounded via the third fan BF 4 . In at least one embodiment, the second fan TF is located at a top of the test chamber  100 . The number of third fans BF 1 -BF 4  are located beside the number of resistors R 1 -R 4  respectively. 
         [0016]    The illuminating circuit  40  includes a third switch S 4  and an lamp A 5 . A first terminal of the third switch S 4  is electrically coupled to the second terminal of the fuse F. A second terminal of the third switch S 4  is grounded via the lamp A 5 . In at least one embodiment, the lamp A 5  is a fluorescent lamp. 
         [0017]    In use, the first switch S 1  is closed, the power supply  11  and the temperature controller  12  receives the AC voltage and are powered on. The temperature controller  12  detects a temperature in the test chamber  100 . When the temperature in the test chamber  100  is lower than a predetermined temperature in the temperature controller  12 , the control signal output terminal J 1  of the temperature controller  12  outputs a heating control signal. The first power output terminal P 1 , the second power output terminal P 2 , and the third power output terminal P 3  output power on signals respectively. 
         [0018]    The winding unit M receives the power on signal from the first power output terminal P 1  and is powered on. The switch unit K is closed. The second terminal and the third terminal of the switch unit K are electrically connected. The first terminal and the third terminal of the switch unit K are cut off. The second fan TF and the number of third fans BF 1 -BF 4  can not receive the power on signal from the second power output terminal P 2  and are powered off. The number of resistors R 1 -R 4  and the two first fans F 1 , F 2  receives the power on signal from the third power output terminal P 3  and are powered on. The number of resistors R 1 -R 4  heat in the test chamber  100 . The temperature in the test chamber  100  is increased. The two first fans F 1 , F 2  rotate and dissipate heat for the bottom of the test chamber  100 . 
         [0019]    In the working process, the second switches S 2 , S 3  are selectively closed. The lamps A 1 , A 2 , and the lamps A 3 , A 4  selectively receive the power on signal from the third power output terminal P 3 . The lamps A 1 , A 2 , or the lamps A 3 , A 4  are powered on. The temperature in the test chamber  100  is increased to a required value. 
         [0020]    When the temperature in the test chamber  100  is higher than the predetermined temperature in the temperature controller  12 , the control signal output terminal J 1  of the temperature controller  12  outputs a cooling control signal. The first power output terminal P 1 , and the third power output terminal P 3  output power off signals respectively. The second power output terminal P 2  outputs a power on signal. 
         [0021]    The winding unit M can not receive the power on signal from the first power output terminal P 1  and is powered off. The switch unit K is opened. The second terminal and the third terminal of the switch unit K are cut off. The first terminal and the third terminal of the switch unit K are electrically connected. The second fan TF and the number of third fans BF 1 -BF 4  receive the power on signal from the second power output terminal P 2  and are powered on. The number of resistors R 1 -R 4  and the two first fans F 1 , F 2  can not receive the power on signal from the third power output terminal P 3  and are powered off. The number of third fans BF 1 -BF 4  rotate and dissipate heat for the corresponding resistors R 1 -R 4 . The temperature in the test chamber  100  is decreased. The second fan TF rotate and dissipate heat for the top of the test chamber  100 . 
         [0022]    In the working process, the third switch S 4  is closed as required, the lamp A 5  receives the AC voltage and emits light in the test chamber  100 . The fuse F protects the power supply  11  and the temperature controller  12  from being damaged when there is an over current in the system. 
         [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 printed circuit board. 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.