Patent Publication Number: US-2004056635-A1

Title: Non-polar charger

Description:
BACKGROUND OF THE INVENTION  
       [0001] (a) Technical Field of the Invention  
       [0002] The present invention relates to a charger, and in particular, to a non-polar charger which supplies power source to a reference voltage circuit and a voltage stabilizing circuit.  
       [0003] (b) Description of the Prior Art  
       [0004]FIG. 1 shows a conventional power supply or charger device  4  restricted only to uni-polar loop and the device  4  cannot provide alternative application for the positive and negative clipping heads  40 ,  41 . As a result, it is very common that the polarity of the heads  40 ,  41  are mistakenly connected, causing a short circuit to a battery  42  and damaging the conductive pole  43 . In very serious case, the battery  42  may be exploded.  
       [0005] Further, there is no safety, power cut-off protection device, such as sensors, provided at the positive or negative clipping heads  40 ,  41  such that when the heads  40 ,  41  dislocate from the conductive pole  43 , the power of the positive and negative pole cannot be cut-off.  
       [0006] Accordingly, it is an object of the present invention to provide a non-polar charger such that the two ends of the clipping head of the charging device can be alternatively charged.  
       SUMMARY OF THE INVENTION  
       [0007] It is an object of the present invention to provide a non-polar charger having a voltage stabilizing circuit, a positive voltage inspection circuit, a negative voltage inspection circuit, a reference voltage circuit, a manual switching circuit, a main switching circuit, a switching circuit, a current conduction indication circuit and a self-locking self current cut-off circuit, characterized in that the input terminal of the charger supplies power source to the reference voltage circuit and the voltage stabilizing circuit, and a stable voltage is supplied to the manual switching circuit and the positive voltage inspection circuit, the positive voltage inspection circuit and the negative voltage inspection circuit determine whether the voltage is positive or negative and the polarity of the voltage is indicated by the indication circuit, when the value of the positive terminal is larger than the reference voltage the main switching circuit is in conduction caused by the initiation of the relay, the normal open point of the relay is connected to the normal close point of the delay so that the positive terminal outputs the voltage, the negative terminal sensing end receives a negative voltage and the value of the reference voltage is smaller than the negative voltage, the self cut-off circuit outputs is at a low potential the relay of the switching switch cannot be initiated and the normal close point is connected to the ground terminal and is connected to the control point, at this instance the output of the negative clipping head is a negative voltage, if the positive terminal sensing end receives a negative voltage, a voltage is output by the negative voltage circuit to the self cut-off relay circuit as a high potential such that the switching switch is simultaneously switched to conduct, and the normal open point is connected to the ground terminal and the control point is connected to the output of the positive terminal clipping head, and the relay is connected to the input end such that the positive terminal clipping head output is a negative voltage and the negative clipping head output is a positive voltage, thereby the charger provides the alternative use of the polarity.  
       [0008] Yet another object of the present invention is to provide a non-polar charger, wherein the switching circuit can be switched to mandatory conduct power to the positive clipping head to output a positive voltage by a manual switching circuit, achieving a supplying of power source.  
       [0009] The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
       [0010] Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0011]FIG. 1 is a perspective view of a conventional charger.  
     [0012]FIG. 2 is a perspective view of a charger of the present invention.  
     [0013]FIG. 3 is a block diagram flowchart in accordance with the present invention.  
     [0014]FIG. 4 is a circuit diagram in accordance with the present invention.  
     [0015]FIG. 5 is a perspective view of another preferred embodiment in accordance with the present invention.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
     [0016] The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
     [0017]FIG. 2 shows a non-polar charger comprising a circuit board  11 , a positive and negative terminal sensing clips  17 ,  18  and conductive plates  171 ,  181 . The circuit board  11  is positioned within the charger  11  and the sensing clips  17 ,  18  are extended from the circuit board  11 . The conductive regions  172 ,  182  at the front end of the clips are provided with the conductive plates  171 ,  181  at the side thereof for conduction to the circuit board  11 . When the sensing clips  17 ,  18  are opened, the power source to the sensing clips  17 ,  18  are cut off and the positive and negative sensing clips  17 ,  18  do not have current and are safe to the user.  
     [0018] As shown in FIG. 3, power source is supplied to the reference voltage circuit  2  and the voltage stabilizing circuit  113  via the input end  114  and the stabilizing circuit  113  is used to stable supply voltage to a manual switching circuit  112  and the positive voltage inspection circuit  3 . The inspection circuit  3  and the negative inspection circuit  5  are used to determine the positive voltage or negative voltage so as to ensure direction of the power supply to drive indication circuit  111 , showing the presence of current. When the positive terminal inspection end  50  is larger than the reference voltage, the circuit  3  will trigger the relay  61  so that the main switching circuit  6  is in conduction. The normal open point  63  of the relay  61  is connected to the normal close point  72  of the relay  71  such that the positive terminal output  75  and the negative terminal inspection end go being a negative voltage, the value of the reference potential is smaller than the negative voltage so that the output of the self-power cut-off circuit  9  is at a low potential and the relay  81  of the switching switch  8  cannot be triggered. The normal close point  82  is connected to the ground terminal  70  and is connected to a control point  84 . At this instance, the negative terminal clip output  85  is a negative voltage. On the other hand, if the positive terminal sensing end  50  receives a negative voltage, by means of a negative voltage circuit, a voltage is output to the output terminal of the self current cut-off circuit  9  being at high voltage such that the switching switches  8 ,  7  are simultaneously switched to conduction and the normal open point  73  is connected to the ground terminal  70  and the control point  74  is connected to the output  75  of the positive terminal. The relay  61  is not triggered and the normal close point  62  is connected to the input terminal  114 . The output  75  of the positive clip is charge to negative voltage, and the output  85  of the negative clip head is a positive voltage so as to achieve the function of polar exchanging.  
     [0019] The two end points of the manual switching circuit  112  mandatory are caused to conduct such that the current of the stabilizing voltage circuit  113  passes the starting relay  61  via the control point  64  to the normal open point  63  connected to the positive clip head output  75  being a positive voltage. Then, a positive voltage source is supplied so as to avoid the battery  42  is at a low voltage or the voltage is lower than the sensed value, in order to start charging the manual switching circuit  112  so as to increase the activeness of application.  
     [0020] Referring to FIG. 4, if a DC voltage flows to resistors R 1 , R 2 , via the input terminal  114 , and a reverse zener diode ZD 1  is provided with a stable voltage, and the current of the resistance R 2  respectively provides a reference voltage  2  output to the input point  32  of the calculation amplifier UIA and the input negative end  53  of the calculation amplifier UIC, such that when the positive terminal inspection end  50  receives a positive voltage, the diode ID 1  is in conduction to the positive end  33  of the calculation amplifier UI-A such that the input point  32  and the positive end  33  produce a potential difference such that the output point  31  becomes a high potential to drive the current to pass through diode D 6 , resistance R 14 , causing the diode D 7  to glow. At the same time the high potential of the amplifier UI-A initiates the normal open point  63  of the relay  61  pass through the normal close point  72  of the relay  71  to connect at the output end  75 . When the negative terminal inspection end  50  receives a negative voltage, resistance R 8  and diode D 2  biased clockwise, and D 1  biased anti-clockwise to the input point  33 , such that the output point  31  of the calculation amplifier UI-A stops as a result of the low potential, and the input point  52  of the calculation amplifier UI-C is connected to the output point  54  of the calculation amplifier UI-B, and the input point  52  and the output point  54  are parallel connected to a resistance R 9 . By means of the diode D 8  biased clockwise to the input point of the amplifier UI-D and is in conduction with the output point  51  of the amplifier UI-C, the negative end  92  and the input point  93  of the amplifier UI-D produce a potential difference.  
     [0021] The input point  91  is at a high voltage current, and passes through the diode D 5 , the resistance R 14  of such that the diode D 7  glows. When the output point  91  being at high potential passes through the resistance R 10 , the base terminal of the transistor Q 1  is clockwise biased and at the same time, the starting relays  81 ,  71  are activated such that the normal close point  72  is switched to the normal open point  73  at the ground terminal  70 . At this point, the output  75  of the positive terminal clip head is charged to a negative voltage, and when the normal close point  82  is switched to the normal open point at the normal close point  62 , the negative terminal output  85  is charged to a positive voltage.  
     [0022] The voltage stabilizing circuit  113  stabilizes a voltage at the end point of the manual switch  112  connected to the output point such that the control point  64  is switched to normal open point  63 , and via the normal close point  72  and the control point  74 , the output  75  of the positive clipping head is a positive power source so as to overcome the no-voltage problem in the battery.  
     [0023] In accordance with the present invention, the circuit board  11  is mounted within the housing  19  and the front end of the housing  19  is extended to form conductive wires  151 ,  161  connected to the positive and negative terminal sensing clips  17 ,  18 . One side of the housing  19  is provided with a plurality of diodes  191  to indicate whether the voltage is supplied with current. The rear end of the housing  19  is provided with securing seats  192 ,  193  having screws  194 ,  195  to be mounted therein.  
     [0024] Holes  196 ,  197  are provided for the passage of wires  15 ,  16 . When user uses a charger with polarity the wires  15 ,  16  at the front end of the charger  4  are cut and the wires  15 ,  16  are respectively inserted into the holes  196 ,  197  (as shown in FIG. 5) so as to achieve the non-polar objective of the present invention.  
     [0025] The advantages of the present invention are that  
     [0026] (i) The positive and negative wire clipping head can be used alternatively.  
     [0027] (ii) The power source of the positive and negative terminal clipping head is cut off when the positive and negative terminal clipping head are removed from the battery.  
     [0028] (iii) The charger is provided with a self polar-switching function.  
     [0029] (iv) When the voltage of the battery is approached to zero volt, the manual switching circuit can control the mandatory of current supply.  
     [0030] (v) The charger is provided with a current cut off protection device.  
     [0031] It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
     [0032] While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.