The patent's assignee for patent number 8649132 is
News editors obtained the following quote from the background information supplied by the inventors: "The teachings in accordance with the exemplary embodiments of this present disclosure generally relate to a trip device, and more particularly to a trip device for use in a circuit breaker.
"Generally, circuit breakers are used to protect electrical circuitry from damage due to an over-current condition, such as an overload condition or a relatively high level short circuit or fault condition by automatically interrupting the circuitry.
"The circuit breaker may be largely categorized into three types, based on trip method, that is, a bimetal type which carries out a trip operation by being heated and bent in response to a persistent over-current condition, an electromagnetic field type which operates by sucking a core in response to an electromagnetic field formed on a coil when an over-current flows, and an electronic type which adopts an electronic trip device and a microprocessor.
"The electronic trip device is advantageous in that it is not affected by ambient temperatures and little characteristic differences exist among products to provide a frequency characteristic that cannot be embodied by other types of trip devices, such that demands on electronic trip devices increase for important and high-end facilities
"Many circuit breakers also use auxiliary trip systems to perform auxiliary functions in addition to intrinsic function of circuit breaker. The auxiliary trip systems can be used in several ways, but are typically used to trip a breaker more rapidly than a primary trip device of the breaker. For example, the most frequently used auxiliary systems include an under-voltage trip device (UVT) and a remotely switchable trip auxiliary device (hereinafter referred to as remote trip device).
"The UVT is an auxiliary trip system that detects under-voltage on a circuit if voltage lower than rated voltage is applied to the circuit, thereby automatically tripping the circuit breaker for protecting the circuit. That is, the UVT trips a circuit breaker when a load or a voltage on a line drops by 20%.about.70% below a reference voltage or when there occurs a blackout to prevent damage to the load or to the line from over-current during return to original voltage. The UVT includes therein a trip coil and electronic circuit.
"The remote trip device is an auxiliary trip system capable of performing a remotely switchable trip function when a circuit breaker needs an emergent trip function due to abnormalcy on a load or on a line. The remote trip device includes therein a trip coil.
"Now, a process of coupling an auxiliary trip system such as UVT or a remote trip device to an electromagnetic field type circuit breaker will be described with reference to FIG. 1.
"FIG. 1 is a schematic view illustrating a coupled structure of an auxiliary device to a circuit breaker according to prior art.
"In order to conventionally couple an auxiliary device (120) such as an UVT or a remote trip device to a circuit breaker, a user must open an auxiliary cover (110) rotatably mounted on a breaker cover (100) and personally mount the auxiliary device (120) to the circuit breaker.
"To be more specific, when a user first unscrews a bolt (130) fastened to a side of the auxiliary cover (110) using a screw driver and rotates the auxiliary cover to one direction, the auxiliary cover (110) is opened as one side of the auxiliary cover (110) is hinged to the cover (100), as shown in FIG. 1.
"At this time, a pair of fastening grooves (140) is formed respectively on right and left upper sides of the cover (100) to allow a standardized size of auxiliary device (120) to be inserted, where the user inserts and couples the auxiliary device to the grooves (140).
"The conventional circuit breaker thus configured is disadvantageous in that both the UVT and the remote trip device as auxiliary devices must be equipped to detect an under-voltage on a circuit if a voltage lower than a rated voltage is applied to the circuit and to remotely trip a remote accident.
"There is thus a need for a trip device that requires a fewer auxiliary trip systems, less energy and inconvenience for operation and that is less in cost."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventor's summary information for this patent: "The present disclosure has been made to solve the foregoing disadvantages of the prior art and therefore an object of certain embodiments of the present disclosure is to provide a trip device of circuit breaker capable of performing both functions of an under-voltage trip device (UVT) and a remote trip device.
"Technical subjects to be solved by the present disclosure are not restricted to the above-mentioned description, and any other technical problems not mentioned so far will be clearly appreciated from the following description by the skilled in the art. That is, the present disclosure will be understood more easily and other objects, characteristics, details and advantages thereof will become more apparent in the course of the following explanatory description, which is given, without intending to imply any limitation of the disclosure, with reference to the attached drawings.
"An object of the invention is to solve at least one or more of the above problems and/or disadvantages in whole or in part and to provide at least advantages described hereinafter. In order to achieve at least the above objects, in whole or in part, and in accordance with the purposes of the disclosure, as embodied and broadly described, and in one general aspect of the present invention, there is provided a trip device of a circuit breaker, the device comprising: a rectifying unit converting an AC (Alternating Current) voltage applied to the circuit breaker to a DC (Direct Current) voltage; a smoothing unit connected to the rectifying unit in parallel to mitigate ripples of the converted DC voltage; and a trip coil connected to the smoothing unit in parallel to determine whether to trip the circuit breaker.
"Preferably, but not necessarily, the trip device further comprises a switching element connected to the trip coil in parallel to be turned on in response to an external control signal.
"Preferably, but not necessarily, the external control signal is an interruption signal inputted through a user interface.
"Preferably, but not necessarily, the trip coil trips the circuit breaker.
"Preferably, but not necessarily, the trip coil trips the circuit breaker if an applied voltage is less than a reference voltage.
"Preferably, but not necessarily, the rectifying unit includes bridge diodes.
"Preferably, but not necessarily, the smoothing unit includes at least one or more parallel-connected capacitors.
"Accordingly, different from the conventional technique requiring both an under-voltage trip device (UVT) and a remote trip device, the trip device of a circuit breaker according to the present disclosure can advantageously perform both the remotely switchable trip function and the under-voltage trip function by using one auxiliary device to dispense with separate purchase and/or installation of the under-voltage trip device (UVT) and the remote trip device, thereby simplifying a circuit structure, reducing a manufacturing cost, an installation space and a user inconvenience."
For additional information on this patent, see: Yang,
Keywords for this news article include: Electronics,
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