Patent Application
20110050439
1. Field of the Invention
The present invention relates to a protector having a dual-warning outer casing.
2. Description of the Prior Art
Generally, there is a protector disposed between a telecommunication cable and a switchboard apparatus for preventing the equipment from being damaged because of a short circuit or a lightning strike. A conventional protector comprises a protection circuit and an alarm circuit. The protection circuit uses a thermistor and a semiconductor discharge tube for protecting it from over voltage or over current. The alarm circuit uses an illuminating member to activate a photoresistor which is adapted to start a light emitting diode to radiate light for providing a warning to remind the maintenance personnel of abnormal circuit. However, the conventional protector is unable to remind the maintenance personnel of high voltage when the parts in the protector have a breakdown or aging, which may cause an accident because of getting an electric shock. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve this problem.
A protector having a dual-warning outer casing includes a housing and a circuit board. The housing has one end formed with a pull portion. The pull portion has a through hole for insertion of an illuminating unit. The circuit board is disposed in the housing and includes two protection modules, a first alarm module and a second alarm module thereon. The first alarm module and the second alarm module are connected with the illuminating unit. Thereby, the protector is capable of sending warnings for abnormal circuit and high voltage via the illuminating unit, preventing the maintenance personnel from getting an electric shock.
Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
As shown in
The housing 10 has one end formed with a pull portion 11. The pull portion 11 is made of transparent material and formed with a through hole 12.
The circuit board 20 is disposed in the housing 10, and comprises two protection modules 21, a first alarm module 22 and a second alarm module 23 thereon.
The illuminating unit 30 is disposed in the pull portion 11 of the housing 10. In this embodiment, the illuminating unit 30 comprises a first light emitting diode 31 disposed in the through hole 12 and two second light emitting diodes 32 disposed on the circuit board 20. The first light emitting diode 31 is electrically connected to the first alarm module 22, and the second light emitting diodes 32 are electrically connected to the second alarm module 23.
The first alarm module 22 includes a first resistor 221 and a third light emitting diode 222 which are connected to the aa′ signal line/bb′ signal line in the way of parallel connection, and a phototransistor 223 located at a rear end of the protection module 21 and connected to the ground wire E in the way of series connection. The phototransistor 223 is close to the third light emitting diode 222, and has a rear end connected to the first light emitting diode 31 of the illuminating unit 30.
The second alarm module 23 includes a second resistor 231 connected to the aa′ signal line/bb′ signal line in the way of parallel connection. The resistance valve of the second resistor 231 is much greater than that of the first resistor 221. The second resistor 231 has a rear end connected to the second light emitting diode 32 of the illuminating unit 30.
Referring to
The parts in the protector 100 may become aging. In this embodiment, the semiconductor discharge tube 23 on the aa′ signal line becoming aging is given as an example. When there is a surge, the semiconductor discharge tube 231 fails to form a closed circuit. Thus, the resistance valve of the thermistor 211 rises quickly to form high current, which will blow the fuse 212. The current will be forced to go toward the first alarm module 22 and the second alarm module 23 for starting the first light emitting diode 31 and the second light emitting diode 32 to radiate light. The pull portion 11 of the housing 10 is made of transparent material such that the maintenance personnel is able to know that the protector 100 has high voltage when the second light emitting diodes 32 is radiating light, preventing the maintenance personnel from getting an electric shock.
Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.
