Circuit for indicating abnormality of three-mode surge absorber of public electric power and a multiple-end fuse

Abstract

A circuit for indicating abnormality of a three-mode surge absorber of a public electric power is disclosed. The circuit is serially connected between the input end and output end of a public electric power supply for indicating the abnormality of a three-mode surge absorbing device of a public power supply so as to achieve the object of indicating an obvious indication to the users. The circuit includes a first surge absorbing device, a first three-end fuse, an abnormal indication circuit, a second surge absorbing device and a second two-end fuse. Other than indicating the abnormality of the L-N, L-G, N-G surge absorbing devices, the present invention can prevent current leakage as destroys occurs in the diverse modes.

What is claimed is:  
     
         1 . A circuit for indicating abnormality of a three-mode surge absorber of a public electric power serially connected to an input end and an output end of a public power supply, said input end having a line input end, a neutral input end, and a ground input end; said output end including a line output end, a neutral output end, and a ground output end for indicating abnormalities of a three-mode surge absorber of a public electric power completely; said circuit for indicating abnormality of a three-mode surge absorber of a public electric power comprising: 
 a first surge absorbing device coupled to said line input end and said neutral input end for absorbing a surge between said line input end and said neutral input end;    a first three-end fuse coupled to said first surge absorbing device and said line input end for preventing abnormality of parts;    an abnormal indication circuit coupled to said first three-end fuse for indicating the abnormality of three-mode in public power supply;    a second surge absorbing device coupled to said abnormal indication circuit, said neutral input end and said ground input end for absorbing a surge between said neutral input end and said ground input end; and    a second three-end fuse coupled to said neutral input end and said second surge absorbing device for preventing the abnormality of parts.    
     
     
         2 . The circuit for indicating abnormality of a three-mode surge absorber of a public electric power as claimed in  claim 1 , wherein said first surge absorbing device comprises: 
 a two-end temperature sensing fuse having one end coupled to said line input end and another end coupled to a first end of said first three-end fuse; and    a surge absorbing device having one end coupled to said line input end and another end coupled to a second end of said first three-end fuse;    wherein when the surge absorbing device has abnormality and then is heated gradually, said two-end temperature sensing fuse will be burnt to break out finally.    
     
     
         3 . The circuit for indicating abnormality of a three-mode surge absorber of a public electric power as claimed in  claim 1 , wherein said abnormal indication circuit comprises: 
 a resistor having one end coupled to a third end of said first three-end fuse;    a diode having one end coupled to the resistor; and    a light emitting diode having one end coupled to a diode, and another end coupled to said second surge absorbing device.    
     
     
         4 . The circuit for indicating abnormality of a three-mode surge absorber of a public electric power as claimed in  claim 1 , wherein said second surge absorbing device comprises: 
 a first two-end temperature sensing fuse having one end coupled to said abnormal indication circuit and another end coupled to a second end of said second three-end fuse;    a first surge absorbing device having one end coupled to said line output end;    a second surge absorbing device having one end coupled to a second end of said second three-end fuse and another end coupled to another end of said first surge absorbing device; and    a second two-end temperature sensing fuse having one end coupled to said second surge absorbing device and another end coupled to said ground output end;    wherein when said first surge absorbing device has abnormality, it will heat gradually and finally said first two-end temperature sensing fuse will burn and then break out; when the second surge absorbing device has abnormality, and heats gradually, said first two-end temperature sensing fuse will burn and then break out, and finally, the second two-end temperature sensing fuse burn and break out.    
     
     
         5 . The circuit for indicating abnormality of a three-mode surge absorber of a public electric power as claimed in claims  2  , wherein the first and second surge absorber are selected from one of a group containing metal oxide varistors, gas tubes, transient voltage suppresser and sidactor.  
     
     
         6 . The circuit for indicating abnormality of a three-mode surge absorber of a public electric power as claimed in claims  4 , wherein the first and second surge absorber are selected from one of a group containing metal oxide varistors, gas tubes, transient voltage suppresser and sidactor.  
     
     
         7 . A multiple-end fuse, at least one ends being added to a two-end fuse, when a current sufficient burnt said two-end fuse to break off flowing through a first end and a second end of said two-end fuse, a third end or other ends being cut off so that said third end or other ends are completely isolated from said first or said second ends.  
     
     
         8 . The multiple-end fuse as claimed in  claim 7 , wherein the multiple-end fuse is a three-end fuse.  
     
     
         9 . The multiple-end fuse as claimed in  claim 7 , wherein the multiple-end fuse is one selecting from a group containing a copper traces on a print circuit board, and jumping wires on a printing circuit board.  
     
     
         10 . The multiple-end fuse as claimed in  claim 7 , wherein the multiple-end fuse is disposed flatly, uprightly or formed as a box.