Abstract:
A power line warning light apparatus is installed on power lines (electric power transmission lines), and uses the electromagnetic coupled power from the power line to generate a periodical flashing light as a warning signal to the nearby flying vehicles to prevent collisions.

Description:
[0001]    This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No(s). 091132528 filed in TAIWAN, R.O.C. on Nov. 4, 2002, which is (are) herein incorporated by reference.  
         BACKGROUND OF THE INVENTION  
         [0002]    1. Field of Invention  
           [0003]    This invention relates to a flashing light fixed on a power line. The flashing light has a set of iron core and coil, which transfer the magnetic field induced by the current in the power line to a voltage source. The voltage source further charges a capacitor in an increasing voltage charging circuit, so that the voltage on the capacitor is charged to a predetermined high voltage. The high voltage then triggers a circuit of the flashing light so as to light up a flash lamp. After the capacitor is discharged by the flash lamp, the increasing voltage charging circuit charges the capacitor again, which is for the next flashing and discharging process.  
           [0004]    2. Related Art  
           [0005]    Conventional power lines (electric power transmission lines) are usually hanged with pylons, and the electric power is transferred through decades, or even hundreds of kilometers from power plants to power transformer stations in cities. The pylons and power lines usually threaten the flying vehicles in low altitudes due to their heights, especially in the night or poor vision weather. Accordingly, it is one of the best caution methods to install flashing lights on the power lines as a warning marker.  
         SUMMARY OF THE INVENTION  
         [0006]    Regarding the above-mentioned problem, it is an objective of the invention to provide an apparatus, which can provide a warning flashing light on a power line to caution pilots of the aviation vehicles in low altitudes. Thus, the pilots can tell the position of the power line and prevent a collision. In this invention, an annular iron core surrounds a power line, so that a magnetic flux generated by an annular magnetic field, which is induced by the current flowing in the power line, appears in the iron core. An enameled coil further winds on the iron core so as to obtain an induced voltage source promptly from two terminals of the enameled coil. Furthermore, the voltage source connects to an increasing voltage charging circuit, so as to charge a capacitor. When the voltage of the capacitor is charged to a predetermined high voltage, a flash lamp is then triggered and turned on, and the capacitor is discharged by the flash lamp at the same moment. After the capacitor is discharged and the flash lamp is turned off, the increasing voltage charging circuit charges the capacitor again for the next flash. As a result, a periodic flash can be obtained. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]    The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:  
         [0008]    [0008]FIG. 1 is a schematic illustration showing a power line warning light apparatus according to a preferred embodiment of the invention; and  
         [0009]    [0009]FIG. 2 is a circuit connection diagram of the power line warning light apparatus according to the preferred embodiment of the invention. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0010]    Referring to FIG. 1, the power line warning light apparatus of the invention consists of an iron core  1 , an enameled coil  2 , an increasing voltage charging circuit  3 , and a flash lamp  4 . The iron core  1  surrounds over a power line  5 , and the entire circuitry of the apparatus is fixed on the power line  5 . Moreover, the enameled coil  2  is wound on the iron core  1 . The output terminal of the enameled coil  2  is connected to the increasing voltage charging circuit  3 , and the output terminal of the increasing voltage charging circuit  3  is connected to the flash lamp  4 . When an alternating current is flowing in the power line  5 , an annular alternating electromagnetic field is induced around the power line  5 . The alternating electromagnetic field can induce a magnetic flux in the iron core  1 , and a voltage on the enameled coil  2  is then obtained. The increasing voltage charging circuit  3  increases the voltage output from the enameled coil  2 , and then charges the increased voltage to the flash lamp  4  to light it up.  
         [0011]    The circuit connection diagram of the increasing voltage charging circuit  3  in the apparatus of the invention is shown in FIG. 2. An iron core  21  surrounds the power line, and a coil  22  is wound on the iron core  21 . The output terminal of the coil  22  connects to the input terminal of a transformer  23 . One output terminal of the transformer  23  connects to a diode  24 , and the other output terminal of the transformer  23  connects to a common ground wire of the increasing voltage charging circuit  3 . The output terminal of the diode  24  connects to a capacitor  25 , a resistor  26 , and a flash lamp  31 . The capacitor  25  and the flash lamp  31  further connect to the common ground wire, respectively. The resistor  26  further connects to a capacitor  27 , a neon lamp  28 , and one input terminal of a transformer  30 . The capacitor  27  further connects to the common ground wire, and the neon lamp  28  further connects to the gate of a silicon controlled rectifier  29 . One output terminal and the other input terminal of the transformer  30  connect to the anode of the silicon controlled rectifier  29 , and the cathode of the silicon controlled rectifier  29  connects to the common ground wire. The other output terminal of the transformer  30  connects to the trigger plate of the flash lamp  31 .  
         [0012]    In the embodiment, the iron core  21  surrounds the power line, so that the magnetic flux is induced in the iron core  21  by the electromagnetic field around the power line as the current flows through it. Thus, a voltage can be induced at the output terminal of the coil  22 , which is wound on the iron core  21 . The voltage will be increased to an alternating voltage in the magnitude of about 280 volts by the transformer  23  and then output from the transformer  23 . After the diode  24  and capacitor  25  rectifies and filters the output voltage from the transformer  23 , a direct current (DC) voltage in the magnitude of about 400 volts is obtained finally. The DC voltage charges the capacitor  27  via the resistor  26 . When the voltage of the capacitor  27  increases over 90 volts, it light up and conduct the neon lamp  28 . The current through the neon lamp  28  flows to the gate of the silicon controlled rectifier  29 , so as to conducts the anode and cathode of the silicon controlled rectifier  29 . Consequently, a current flows to the input terminal of the transformer  30 , and a high voltage output in the magnitude of 2000 to 4000 volts is then transformed with and output from the transformer  30 . The high voltage is connected to the trigger plate of the flash lamp  31  and triggers the flash lamp  31  to flash. It should be noted that when the flash lamp  31  flashes, the voltage of the capacitor  25  is discharged correspondingly. Thus, the flash lamp stops flashing when the voltage of the capacitor  25  is discharged. At this moment, the neon lamp  28  is turned off and the whole circuit starts over the charge sequence for the next flash.  
         [0013]    In summary, the power line warning light apparatus of the invention has the following advantages of:  
         [0014]    1. It provides a high luminance flash warning to aviation vehicles in low altitudes and avoids their collisions with power lines.  
         [0015]    2. It is driven by the power transmitted in the power line and can be used to monitor the power status. For example, no flash indicates that the current in the power line breaks off.  
         [0016]    3. It is fixed on the power line directly, and additional equipments and power sources are unnecessary.  
         [0017]    4. It is easy to install since the only work to do is to fix it to the power line.  
         [0018]    5. It has a small volume and is light-weighted, which does not increase the loading of the power line significantly.  
         [0019]    Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.