Abstract:
The present invention relates to an protection device of a surge protector, which comprises: a first fuse; a resistor; a switching circuit; a second fuse; and a surge protector; thereby the switching circuit can be turned ON and make the resistor be heated when the sensing end senses a low potential, and then makes the first fuse be opened due to sense heat, so as to cut off the power source.

Description:
REARGROUND OF THE INVENTION  
       [0001]     1. Field of the invention  
         [0002]     The present invention relates to a protection device of a surge protector, more particularly, it relates to a protection device of a surge protector which can automatically cut off the power by using a switching circuit to drive a resistor being heated when the surge protector failed, so as to achieve the goal of automatically cut off the power source.  
         [0003]     2. Description of the Related Art  
         [0004]     In general, the prior art power outlet with surge protector normally used metal oxide varistors (MOV) or other transient/surge protector to stop the surge form being generated. However, the metal oxide varistors (MOV) or transient/surge protector would be heated due to absorbing heat form the surge, and it would cause a short circuit phenomena when it absorbed a huge surge and could not endure anymore; therefore, the prior art surge protector used a temperature fuse or current fuse to prevent the abnormal situation form being generated.  
         [0005]     However, the surge protector would be aged and break down and lose its protecting function after long-term absorbing the surge. The general surge protector normally used an indicator or a buzzer to notify the user that the surge protector had lost its function. But, the electrical equipment(s) plugged into the power outlet with surge protector would pose a potential danger when the surge protector had lost its function and still being used.  
         [0006]     At present, most surge protectors will be heated and burn the temperature fuse so as to achieve the goal of automatically cutting off the power source. However, when the surge protectors endure a huge current surge and they can not cut off the power source, thus the surge protectors with such structure can not effectively achieve the goal of preventing the backend equipment(s) form being damaged.  
         [0007]     There is therefore a need for a new and improved strategy and technique of a protection device of a surge protector for overcoming these deficiencies and the present invention overcomes these deficiencies in a new and novel fashion.  
       SUMMARY OF THE INVENTION  
       [0008]     According to one aspect of the present invention, the present invention provides a protection device of a surge protector, which can automatically cut off the power by using a switching circuit to drive a resistor being heated when the surge protector failed, so as to achieve the goal of automatically cut off the power source.  
         [0009]     According to another aspect of the present invention, the present invention provides a protection device of a surge protector, which can effectively and automatically cut off the power of the surge protector when the surge protector is abnormally under various bad conditions, so as to achieve the goal of protecting the backend equipment(s).  
         [0010]     For reaching the aforesaid object, wherein, the protection device of a surge protector, which comprises: a first fuse, wherein one end of the first fuse is coupled to a first power input end, and another end of the first fuse is coupled to a first power output end; a resistor, wherein one end of the resistor is coupled to an output end of the first fuse; a switching circuit, further comprising a first end, a second end and a sensing end, wherein the first end is coupled to the resistor and the second end is coupled to a second power output end; a second fuse, wherein one end of the second fuse is coupled to the first power output end, and another end of the second fuse is coupled to the sensing end; and a surge protector, wherein one end of the surge protector is coupled to the sensing end and the second fuse, and another end of the surge protector is coupled to a second power output end; thereby the switching circuit can be turned ON and make the resistor be heated when the sensing end senses a low potential, and then makes the first fuse be opened due to sense heat, so as to cut off the power source. 
     
    
     BRIEF DESCRIPTION OF THE DRAWING PORTIONS  
       [0011]      FIG. 1  shows a perspective view of a protection device of a surge protector according to one embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0012]     Referring to  FIG. 1 , which shows a perspective view of a protection device of a surge protector according to one embodiment of the present invention; As shown in the Fig. the protection device of a surge protector of the present invention mainly comprises: a first fuse  10 ; a resistor  15 ; a switching circuit  20 ; a second fuse  30 ; and a surge protector  40 .  
         [0013]     Wherein, the first fuse  10  is preferably a temperature fuse for sensing the temperature near the wire(s), wherein one end of the first fuse  10  is coupled to a first power input end  51 , and another end of the first fuse  10  is coupled to a first power output end  61 , wherein the first power input end  51  is a line input end (L in ), and the first power output end  61  is a line output end (L out ).  
         [0014]     Wherein one end of the resistor  15  is coupled to an output end of the first fuse  10  and is preferably disposed near the first fuse  10 , for example but not limited to be formed integrally with the first fuse  10 , so as to sense the temperature near the first fuse  10 .  
         [0015]     The switching circuit  20 , for example but not limited to a transistor circuit, further comprises a first end  21 , a second end  22  and a sensing end  23 , wherein the first end  21  is coupled to the resistor  15  and the second end  22  is coupled to a second power output end  52  (N in ), and the sensing end  23  is coupled to the second fuse  30  and the surge protector  40  for sensing the potential level of the point “a” (please refer to  FIG. 1 ). The switching circuit  20  will become an open status when the potential level of the point “a” is high, and the switching circuit  20  will become a short status when the potential level of the point “a” is low.  
         [0016]     Wherein one end of the second fuse  30  is coupled to the first power output end  51 , and another end of the second fuse  30  is coupled to the sensing end  23 . Wherein, the second fuse  30  is a temperature fuse or a current fuse; and the second power output end  62  is a neutral output end (N out ).  
         [0017]     Wherein one end of the surge protector  40  is coupled to the sensing end  23  and the second fuse  30 , and another end of the surge protector  40  is coupled to a second power output end  62 ; wherein, the surge protector  40  is for example but not limited to a metal oxide varistors (MOV) or other transient/surge protectors, so as to prevent the surge from being generated.  
         [0018]     When the protection device of a surge protector of the present invention is assembled completely, firstly, the potential level of the point “a” remains high when the surge protector  40  works normally, and the switching circuit  20  is become an open status, thus there is no current flows through the resistor  15 , therefore , the temperature of the resistor  15  will remain low and the first fuse  10  also remains at normal status, therefore ,the input power can be normally supplied to the power output ends  61 ,  62 .  
         [0019]     The potential level of the point “a” will become low when the surge protector  40  becomes abnormal, for example abnormally heated or over current passed through it, and the second fuse  30  will be actuated due to being over heated or over current, so the potential level of point “a” will become low and the switching circuit  20  will become a short status, thus the current will flow through the resistor  15  and heat the resistor  15 , furthermore, the first fuse  10  will be actuated (that is, becomes an open status), therefore ,the input power will be cut off and can not be supplied to the power output ends  61 ,  62 .  
         [0020]     Therefore, the protection device of a surge protector of the present invention can effectively and automatically cut off the power when the surge protector  40  is abnormally under various bad conditions (such as abnormally heated or over-load current passed through it), so as to achieve the goal of protecting the backend equipment(s), such that the protection device of a surge protector of the prevent invention can overcome the drawbacks of the prior art surge protectors.  
         [0021]     According to the above description, the protection device of a surge protector of the present invention can effectively and automatically cut off the power when the surge protector  40  is abnormally under various bad conditions, so as to achieve the goal of protecting the backend equipment(s), therefore, the protection device of a surge protector of the prevent invention can overcome the drawbacks of the prior art surge protectors.  
         [0022]     Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.