KR102048266B1 - Short circuit detector on speaker line - Google Patents

Abstract

The present invention relates to the short circuit detector of a speaker line. More specifically, in a public address system, when at least one speaker is connected to at least one amplifier, an LED indicating a short channel and a current cut-off part is installed in order to determine whether a short circuit occurs in the speaker line. A photocoupler is installed in parallel with the LED. A short-circuit detection signal is read by a microcomputer control part. The short circuit state is transmitted to a remote PC or main broadcasting device by communication. So, a user can easily check whether the short circuit of the speaker line occurs in real time.

Description

Short circuit detector on speaker line

The present invention relates to a short circuit detection apparatus for a speaker line, and more particularly, to a method for detecting a short circuit state of a speaker line and a method for enabling the remote unit to identify the short circuit condition in real time.

In general, PA system is an automated system for long-distance broadcasting between buildings, which means sound equipment that is built in large facilities. As such, the broadcasting system is installed in a building having a partitioned space, such as a hospital, a school, a performance hall, and an apartment, and the built-in sound system connects a plurality of speakers to one amplifier to provide guidance, fire, and emergency broadcasting. Configure your broadcast system to do this.

In case of using a structure that connects multiple speakers to one amplifier as in the prior art, if some speaker lines are shorted during an emergency such as fire, earthquake, or flood, the output of the amplifier is shorted (short-circuited). All speakers are unable to broadcast. As a result, if the speaker line is shorted (short circuit) during an emergency such as a fire, there is a problem in that the announcement of the entire building is interrupted and the emergency situation cannot be spread quickly, resulting in a large number of casualties.

Conventionally, as a technology for a circuit for protecting amplifiers and speakers of a broadcasting system, a fuse is inserted between an amplifier output line and a speaker line in a speaker line distribution box so that the fuse is disconnected when a short circuit occurs. However, this method does not automatically recover. Hassle of replacing fuse. In addition, when the fuse is used, it is easily broken by a large instantaneous audio signal, and in order to know that the fuse is broken, it is inconvenient to listen to each speaker while broadcasting or to check the blown fuse in the speaker wire distribution box.

In order to solve this problem, an LED indicator is added in parallel with the fuse so that when the fuse is broken, the LED is turned on so that it is easy to find the broken location, or a poly switch is used instead of the fuse to eliminate the trouble of replacing the fuse. .

However, since LED indicators can only display a line that has a short circuit when there is an audio signal, it is inconvenient that a failure can not be confirmed unless the LED indicators are opened by opening the speaker line distribution box and checking the LED indicators one by one.

In addition, when using a poly switch, the LED indicator flashes according to the loudness of the sound and shows a shorted line. If the sound is too loud, the LED of the normal speaker line is also turned on to make it difficult to distinguish from the shorted line. There is a problem that the short circuit of the speaker line is not known because the indicator light does not turn on.

Korean Patent Publication No. 10-2006-0040871 ("Amplifier and Speaker Protection Circuit of Broadcasting System", 2006.05.11.)

The present invention has been made to solve the above problems, and an object of the present invention is to distribute the speaker line to find the speaker line where the short circuit occurs while allowing other speakers to broadcast normally even if some speaker lines are shorted. Inconvenience to check the open and the conventional LED short indicator has a problem that it is difficult to distinguish the shorted speaker line because the LED short indicator continues to flash according to the strength of the audio signal, in the present invention, the user's PC or The present invention provides a short circuit detection device that displays the presence or absence of a short circuit of a speaker line on a broadcast equipment and provides convenience of maintenance and repair of the broadcast equipment.

Short circuit detection apparatus of the speaker line of the present invention, the input device for receiving a voice signal; An amplifier connected to the input device to amplify the voice signal; At least one speaker connected to the amplifier to output a broadcast; A current blocking unit connected between the amplifier and the speaker by a speaker line and blocking the speaker wire when an over current flows due to a short circuit in the speaker wire; And a direct current power source connected to both ends of the current interrupting unit and supplying power to the speaker wire.

The controller may be connected to the speaker line from the current interrupter to determine whether a short circuit occurs in the speaker line.

In addition, LEDs connected in parallel to both ends of the current interrupting unit to directly display the short circuit occurrence state of the speaker line; It characterized in that it further comprises.

The LED is characterized in that when the current interrupting unit is operated, power is supplied from the DC power supply and turned on, and when the short circuit does not occur in the speaker line, the LED is turned off.

In addition, it is provided between the current blocking unit and the DC power source, characterized in that it comprises a current limiting resistor provided between the current blocking unit and the LED.

In addition, the current blocking unit and the LED, characterized in that it comprises a constant voltage diode for supplying a constant voltage to the LED.

In addition, it is characterized in that it further comprises a photocoupler connected in parallel to both ends of the current interruption unit, changing the current change to light and converting the light back into an electrical signal.

The current interrupting unit may include at least one of a fuse, a poly switch, and a capacitor.

The display unit may be connected to the control unit to display whether the speaker line is shorted. It characterized in that it further comprises.

In addition, the display device is connected to the control line via a communication line for receiving whether the speaker line is short-circuited by communication and displays a shorted channel; It characterized in that it further comprises.

In addition, the communication unit is connected to the communication line via a communication line for receiving whether the short-circuit of the speaker line by communication and transmitting the short-circuit state remotely; It characterized in that it further comprises.

The method may further include connecting an S-R flip-flop between the control unit and the photocoupler and maintaining an instantaneous short signal output from the photocoupler during audio output.

The short circuit detection apparatus of the speaker line of the present invention having the above-described configuration uses a predetermined current and voltage by supplying a DC power supply to the current interruption unit so that a short circuit of the speaker line can be performed even when there is no broadcast or no audio signal. There is an effect that it can be easily checked by the presence or absence of LED lighting.

In addition, the user can immediately identify the failure site without transmitting the speaker line failure status by remote communication to confirm that the speaker wire distribution.

In addition, according to the present invention, since the fault position of the speaker line can be easily read and can be quickly repaired, the short circuit state of the speaker line is maintained, thereby preventing the breakdown of the amplifier due to overcurrent. By keeping the broadcasting equipment available at all times, it has the effect of preventing accidents that cannot be broadcast in an emergency situation.

1 is a block diagram of a short circuit detection apparatus of a speaker line according to an exemplary embodiment of the present invention.
2 is a circuit diagram of a short circuit detection apparatus of a speaker line according to an exemplary embodiment of the present invention.
3 is an enlarged circuit diagram of a short circuit detecting apparatus for a speaker line according to an exemplary embodiment of the present invention.
4 is a diagram illustrating a method of supplying DC power to both ends of a current interruption unit of a short circuit detection apparatus of a speaker line according to an exemplary embodiment of the present invention.
5 is a diagram illustrating an apparatus for detecting a short circuit of a speaker line using an SR flip-flop according to an embodiment of the present invention.
6 is a flowchart illustrating a method of operating a short circuit detection apparatus of a speaker line using an SR flip-flop according to an embodiment of the present invention.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be variations.

Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings. The accompanying drawings are only examples to illustrate the technical idea of the present invention in more detail, and thus the technical idea of the present invention is not limited to the forms of the accompanying drawings.

1 is a block diagram of a short circuit detecting apparatus 1000 of a speaker line according to an exemplary embodiment of the present invention, and FIG. 2 is a circuit diagram of a short circuit detecting apparatus 1000 of a speaker line according to an exemplary embodiment of the present invention. To illustrate.

As illustrated in FIGS. 1 and 2, the short circuit detecting apparatus 1000 of the speaker line according to the exemplary embodiment of the present invention basically includes the input device 10, the display device 20, the communication unit 30, and the amplifier 100. ), The speaker 200, the current blocking unit 300, DC power supply 400, the control unit 500, LED 600, current limiting resistor 700, photocoupler 800, display unit 900 Can be done.

First, referring to FIG. 2, the circuit of the short circuit detecting apparatus 1000 of the speaker line according to the exemplary embodiment of the present invention may include an amplifier output line L1 between the output of the amplifier 100 and the current interruption unit 300. ), The output of the current blocking unit 300 and the speaker 200 is connected to the speaker line (L4), the amplifier 100 to the speaker 200 and the amplifier common line (L3) It is desirable to connect.

In addition, when the communication unit 30 and the control unit 500 of the broadcasting apparatus are connected to the communication line L2 and the short circuit between the amplifier common line L3 and the speaker line L4 occurs, the current interrupting unit ( 300 is detected by the LED 600 is turned on, and at the same time by converting the electric signal that can be detected by the microcomputer through the photocoupler 800 to read the short-circuit signal from the control unit 500 to the display unit 900 The position of the shorted speaker line is displayed, and the position information of the shorted speaker line is transmitted to the communication unit 30 through the communication line L2 and displayed on the display device 20.

1 and 2, the input device 10 is provided to receive a voice signal and is connected to the amplifier 100 connected to the speaker 200 in the building so as to broadcast the entire building. In more detail, it is preferable that the microphone can include a voice input device, and the present invention can broadcast to the whole building.

The display device 20 is connected to the communication unit 30 and displayed so that a short of the speaker line can be recognized from the outside.

The communication unit 30 is connected to the input device 10, the display device 20, the amplifier 100, and the control unit 500. The part connected to the control unit 500 and the short circuit of the speaker line detected by the control unit 500 is displayed on the display device 20 and is notified to an external communication medium or a remote place that is remotely connected to the communication unit 30. Notify me. Accordingly, there is an effect that it is possible to remotely maintain and repair the short circuit of the speaker line and to cope quickly.

The amplifier 100 is connected to the input device 10 and provided with at least one, and amplifies a voice signal. In more detail, the amplifier 100 is connected to at least one speaker 200 and amplifies at least one voice signal received from the input device 10 and transmits the amplified voice signal to the speaker 200.

The speaker 200 is connected to the amplifier 100 to output a broadcast throughout the building, it is preferable that at least one speaker 200 is provided in the building. In more detail, the speaker 200 may be connected to the amplifier 100 and installed in a building to transmit necessary information to those who use or reside in the building. Although one speaker 200 is illustrated in FIG. 2, in the present invention, the broadcast is distributed to the speaker 200 using at least one or more speakers 200, and is preferably broadcasted in part or all of the building.

In addition, the short circuit of the speaker line (L4) in the present invention, two amplifier output lines (L1) are installed in the interior of the building connected to the speaker 200 installed in each floor and each arc, such as a fire, earthquake or other unexpected situation This means a state in which two strands of the speaker line L4 are short-circuited.

The current blocking unit 300 is provided so that the remaining speaker 200 can be normally broadcast even if some lines (lines) of the speaker 200 are short-circuited. In more detail, when the amplifier 100 and the speaker 200 are connected to the speaker line L4, and a short circuit occurs in the speaker wire L4 and an overcurrent flows, the current blocking unit 300 is connected to the speaker. Block line (L4). In addition, the current blocking unit 300 preferably includes at least one of a fuse, a poly switch, and a capacitor. When the current blocking unit 300 is used as a fuse, the fuse is disconnected due to an overcurrent when the speaker wire L4 is short-circuited so that the broadcasting of other channels is not affected, and the current of the speaker wire L4 is blown when the fuse is blown. Is blocked, a voltage difference is generated between both ends of the fuse, so that the LED 600 indicating a short state is turned on. However, even with a momentary large signal, the fuse may blow and the fuse must be replaced each time.

 When the current blocking unit 300 is used as a poly switch, when the speaker line L4 is short-circuited, the resistance value of the poly switch increases due to an overcurrent, and thus the current is cut off without affecting the broadcasting of other channels. The voltage difference between both ends of the LED 600 is turned on to display a short circuit. However, since the brightness continues to change according to the output signal of the amplifier 100, some tips may be necessary to determine a short circuit condition. Unlike the fuse, the polyswitch automatically recovers and does not need to be replaced every time.

When the current blocking unit 300 is used as a capacitor, only the alternating current of the capacitor passes, and the speaker wire L4 is short-circuited because the amplifier 100 and the speaker wire L4 are not directly connected. It does not affect the broadcasting of other channels, and when the short circuit occurs, the voltage difference between the both ends of the capacitor is increased so that the LED 600 displaying the short circuit is turned on. However, since the brightness continues to change according to the output signal of the amplifier 100, some tips may be necessary to determine the short circuit condition. The capacitor has the advantage that it does not need to be replaced each time.

The DC power supply 400 is connected to both ends of the current blocking unit 300, and uses a method of supplying power to the LED 600 on the speaker line (L4). In more detail, the DC power supply 400 is connected to both ends of the current blocking unit 300 in parallel to supply power of a predetermined voltage and current enough to turn on the LED 600.

As such, when power is continuously supplied from the DC power supply 400, the LED 600 displaying a short circuit state can significantly reduce the brightness of the amplifier 100 continuously changing and easily determine the short circuit state. . In particular, when the current blocking unit 300 is a fuse, the LED 600 is immediately turned on even when there is no output of the amplifier 100 at the time of disconnection. Accordingly, it is possible to quickly repair and continuously manage the state of the speaker 200 line. Here, the LED 600 used in the present invention consumes about 0.03W of power by supplying a voltage of 3V and a current of 10mA as a conventional LED.

In addition, the amplifier 100 used for public address broadcasting is an audio output of 70V to 100V, has the characteristics of the AC power of the voltage, and the DC power supply 400 is intended to light up the LED 600, The voltage and current supplied from the DC power supply 400 do not have any influence on the amplifier 100 or the speaker 200.

The controller 500 is connected to the photocoupler 800 that receives whether or not a short circuit occurs in the speaker line L4 from the current interrupter 300. In addition, the control unit 500 includes a microcomputer and is connected to the communication unit 30 of the main broadcasting device through the communication line (L2) to transmit information on the short-circuit line. In other words, the microcomputer transmits a short circuit state through communication to a remote PC or a main broadcasting device so that the user can easily check whether a short circuit occurs in the speaker line in real time. In more detail, the controller 500 receives whether or not a short circuit occurs in the speaker line L4 through the photocoupler 800, and a short circuit occurs in a line of any speaker 200 among the plurality of speakers 200. The short circuit position of the speaker 200 line is transmitted to the display unit 900 so that the display unit 900 knows whether or not the display unit 900 is connected.

The LED 600 is connected in parallel with the photocoupler 800 at both ends of the current interruption unit 300, and directly indicates whether a short circuit occurs in the speaker line L4. When the current blocking unit 300 is operated, power is supplied from the DC power supply 400 to be turned on, and when the short circuit does not occur in the speaker line L4, the lamp is turned off.

In more detail, since the power is supplied from the DC power supply 400 and the LED 600 is turned on and off according to the operation of the current interrupting unit 300, the speaker (continued even when not broadcasting) There is an advantage that can manage the line (line) of 200. In addition, whether or not the LED 600 is turned on is determined according to the output strength of the audio signal. However, since the detection apparatus 1000 according to the exemplary embodiment of the present invention is supplied while maintaining a preset power, a short circuit of the speaker 200 is prevented. There is an advantage that does not affect the detection.

The current limiting resistor 700 is provided between the current interrupting unit 300 and the DC power supply 400, and the current limiting resistor 700 is provided between the current blocking unit 300 and the LED 600. ). More specifically, the current limiting resistor 700 is installed on the circuit for overcurrent protection and is installed to limit the LED to a suitable current to turn on. The DC power supply 400 supplies a predetermined voltage and current to the current interrupting unit 300. When the current limiting resistor 700 is connected, the DC power supply 400 supplies only the current and voltage as long as the LED is turned on when the short circuit is connected. The audio output signal of the amplifier 100 is prevented from flowing directly to the DC power supply 400 side.

In addition, between the current interruption unit 300 and the LED 600, the constant voltage diode (6) for supplying a constant voltage to the LED 600 is added to the LED by the audio output voltage of the irregular amplifier 100 It is effective in preventing breakage.

The photocoupler 800 generally has a light emitting device on the primary side and a light receiving device on the secondary side of the part, and the light emitting device is usually composed of LEDs and the light receiving device is preferably composed of phototransistors. In the operation of the photocoupler 800, the light emitting device is operated by an electrical signal applied to the primary side, and the phototransistor on the secondary side receiving the light is operated to convert the photocoupler 800 into an electrical signal.

In addition, the photocoupler is used to remove noise when the power supply of the primary side and the secondary side is different and difficult to connect directly, or when there is a lot of noise on the primary side, and in addition, the primary side and the secondary side are electrically It is preferably used when transferring signals with isolation. Of course, the present invention is not limited thereto, and the photocoupler may be used in various forms.

In other words, it is preferable to replace the short circuit detection LED 600 by installing the photocoupler 800 in parallel at both ends of the current interruption unit 300, or in parallel with the short circuit detection LED 600. . Accordingly, a signal is transmitted while electrically insulating the control unit 500 composed of a high voltage amplifier 100 and a low voltage flowing through the speaker line, and a short circuit of the speaker line in the microcomputer included in the control unit 500. You can determine whether or not.

The display unit 900 is connected to the control unit 500 to display whether the speaker line L4 is shorted. The display unit 900 may display a portion of the at least one speaker 200 in which a short circuit of the speaker line L4 occurs. The display unit 900 may include a first display unit 910, a second display unit 920, and an N-th display unit 940. And an N-th display unit 930. At this time, the shorted portion may be at least one, it is preferable not to display any when the short circuit.

As such, since the display unit 900 directly displays a shorted portion of the speaker 200 line, there is an advantage that accurate and quick maintenance can be performed in the field. In addition, when a short circuit occurs in the speaker 200 line, the display unit 900 is displayed, and at the same time, the control unit 500 controls the PC and the broadcasting device of the broadcasting equipment operator by RS485, RS232, CAN communication, or network. Preferably, the display device 20 transmits information of the speaker 200 in which a short circuit occurs, and the display device 20 is connected to the current blocking unit 300 in which the voltage difference occurs visually or audibly. It is preferable to display.

In addition, as an embodiment of visually expressing the display unit 900, a warning letter and the number of the speaker is displayed on the liquid crystal device, or a number corresponding to the position of the speaker 200 is input on the numeric display or each speaker ( It is preferable to provide a display unit 900 corresponding to 200. Accordingly, when the speaker line is normal, while maintaining the normal screen, when the short circuit of the speaker line occurs, the screen flickers or the light gradually increases. Of course, the present invention is not limited thereto, and the display unit may be displayed with various embodiments. As an embodiment of audibly expressing the display unit 900, when a short circuit occurs in the speaker 200 line, a preset notification sound and a warning sound may be output, and of course, the display unit 900 may be represented with various embodiments.

3 is an enlarged view of a circuit diagram of a short circuit detecting apparatus 1000 of a speaker line according to an exemplary embodiment of the present invention. Referring to FIG. 3, the circuit diagram of the exemplary embodiment of the present invention will be described in more detail. do.

Referring to FIG. 3, it is an enlarged view of the circuit of the detection apparatus 1000, and it can be confirmed that the current interruption unit 300 is disconnected due to a short circuit of the speaker line L4.

In more detail, when the speaker line L4 is normally normal, as shown in FIG. 2, the current interruption unit 300 is connected, and the LED 600 remains off. When a short circuit occurs in the speaker line L4, power is supplied from the DC power supply 400 connected to both ends of the LED 600 so that the LED 600 is turned on. The LED 600 serves to inform that one of the plurality of speaker lines is short-circuited, and the photocoupler 800 short-circuits the speaker line to the controller 500 based on the signal received from the LED 600. Pass the signal.

The controller 500 determines which speaker 200 of the speaker lines L4 of the plurality of speakers is generated and displays the short circuit in the display unit 900. The display unit 900 may include a first display unit 910 and a second display unit 920 to display the first speaker, the second speaker, the N-1 speaker, and the N-speaker according to the positions of the speakers. ), The N-th display unit 930 and the N-th display unit 940 may be provided to display the position of the corresponding speaker 200 line.

4 is a view showing supply of DC power to both ends of the current interruption unit of the short circuit detection apparatus of the speaker line according to an embodiment of the present invention. Referring to FIG. 4, a DC power supply is provided at both ends of the current interrupter of the present invention. It describes in more detail how to supply.

4 will be described to supply DC power to both ends of the current interrupting unit 300, including various embodiments of FIGS. 4A, 4B, and 4C.

First, FIG. 4A may use the DC power supply 400 in common with the control unit 500 including a microcomputer. Suitable for the basic configuration that always sends the same broadcast to the plurality of speakers 200 connected to the amplifier 100, there is an advantage that the design of the circuit can be made simple and inexpensive easily and economically effective.

4B is a diagram illustrating supplying DC power to both ends of the current interruption unit 300. The DC power supply may be supplied to both ends of the current interruption unit 300 using an isolated DC-DC converter. . In FIG. 4A, even if only a part of the speakers of the plurality of speakers 200 connected to the amplifier 100 are broadcast, the broadcast is also output to the unwanted speaker through the DC power supply 400 connected to both ends of the current blocking unit 300. . In order to prevent this, referring to FIG. 4B, if the DC power supply 400 is supplied to each channel using the insulated DC-DC converter, only the desired speaker may be broadcast. The isolated DC-DC converter is a device that makes the DC power source 400 supplied to the primary side into an AC power source and rectifies the AC power induced to the secondary side through a transformer to form the DC power source 400 again. There is an effect that the power source of the secondary side and the secondary side can be electrically separated. In addition, in the present invention according to an embodiment, the primary DC power supply 400 supplies a predetermined power to the current interrupting unit 300 of the secondary side while preventing the secondary audio signal from flowing to the primary side. Can be used as

FIG. 4C illustrates another embodiment of supplying DC power to both ends of the current blocking unit. The DC power supply 400 is rectified by rectifying the audio output of the amplifier 100, and charged to a large capacity capacitor. The DC power supply 400 may be supplied to both ends of the current blocking unit. At this time, by installing and charging a rectifying circuit and a large-capacity capacitor for each channel of the speaker line L4, the DC power supply 400 is supplied to both ends of the current blocking unit of each channel, so that broadcasting is possible only to the desired speaker as in FIG. 4B. Since the power supplied to the current interrupting unit is separated from the power supply of the controller, the audio output signal of the amplifier 100 is rectified and used, so that a separate power supply is not required, thereby reducing power consumption of the circuit.

FIG. 5 is a diagram illustrating an apparatus for detecting a short circuit line of a speaker line using an SR flip-flop according to an embodiment of the present invention. Hereinafter, a short circuit detecting apparatus for a speaker line using an SR flip-flop will be described with reference to FIG. 5. .

When the speaker line L4 is short-circuited during audio output from the amplifier 100, the photocoupler intermittently outputs a short signal according to the audio output of the amplifier 100. The present invention can more accurately determine the short circuit of the speaker line in the microcomputer of the control unit by using the characteristic of temporarily holding the irregularly output short circuit signal in the S-R flip-flop.

Referring to the operation of the short-circuit detection device of the speaker line using the S-R flip-flop, the S-R flip-flop may temporarily store one value of "1" or "0" in the digital circuit. Referring to FIG. 5, when the microcomputer resets the SR flip-flop in the initialization step, since the "1" is inputted by the pull-up resistor on the input side, "1" is stored therein and the photocoupler is output to "1". While waiting for the signal from, if the input of "0" signal is input even for a short time, it outputs "0" to the output and keeps the status of "0", and when it receives the RESET signal from the microcomputer, it outputs "1" again. The first standby state. The states of " 0 " and " 1 " are set for convenience to explain the characteristics of the S-R flip-flop, and can be changed as much as the method of outputting "1" when "0" is actually input.

Accordingly, the reason why the SR flip-flop is used between the photocoupler and the controller is that when the number of speaker lines is small, the method of directly connecting the output of the photocoupler to the microcomputer of the controller and continuously monitoring the microcomputer may be used. Can be. However, in the public speaker system, the speaker line usually uses 16 to 32 channels, and often more than 64 channels, so the method of directly monitoring all channels in the microcomputer is complicated and error-prone. There are many possibilities. Therefore, it is preferable to use a method in which the microcomputer does not miss a short circuit signal output from the photocoupler using the S-R flip-flop.

FIG. 6 is a flowchart illustrating a method of operating a detection device for determining a short circuit of a speaker line using the SR flip-flop of FIG. 5. Hereinafter, the short circuit detection apparatus for a speaker line using an SR flip-flop will be further described with reference to FIG. 6. The operation method will be described.

 First, as illustrated in FIG. 6, in the short circuit detection method of a speaker line using an SR flip-flop according to an embodiment of the present invention, a photocoupler, an SR flip-flop, and a control unit 500 exchange signals with a temporary large signal. As a method of eliminating the malfunction by the operation and determining the correct short-circuit state, the initialization step (S100), the short-circuit signal wait step (S200), the short-circuit signal detection step (S300), the short-circuit signal storage step (S400), and the short-circuit state determination step (S500) , Short-state data transmission step (S600) can be made.

In the initialization step, the short signal buffer memory set in the internal memory of the microcomputer is initialized, and the microcomputer sends the RESET signal to the S-R flip-flop to initialize the microcomputer.

In the short signal waiting step S200, a short signal output from the photocoupler is waited.

In the short signal detection step (S300), the microcomputer determines whether a short signal is detected by determining a signal output from each S-R flip flop connected to a plurality of speaker line channels.

In the short signal storing step (S400), the microcomputer increases the stored value of the short signal buffer by 1 and stores it again, and initializes the signal by sending a RESET signal to the S-R flip-flop.

In the short state determination step (S500), it is a step of determining whether the short signal buffer value is equal to a preset value. If the short signal buffer value is equal to the preset value, the corresponding line is judged to be a short state, and the flow proceeds to the next data transfer step.

In the short-circuit state data transmission step (S600), the display unit 900 displays the information of the line determined by the microcomputer as a short-circuit state in the short-circuit state determination step (S500), and transmits the short-circuit state data by communication to a remote main broadcasting device. It is the step of transmitting.

Referring to the operation method of FIG. 6 in more detail, first, the initialization step (S100) stores a value of "0" in the short signal buffer memory set in the internal memory by the microcomputer and sends a RESET signal to the SR flip-flop to generate a short signal. This step is to initialize it to make it possible to receive input. The short signal buffer memory is a temporary storage set in the internal memory by the microcomputer and temporarily stores the channel number and the number of the short signal received by the photo coupler.

The short signal waiting step S200 may be performed after performing the initialization step S100. The short signal waiting step (S200) is a step of waiting to receive a short signal of the speaker line at all times because the short circuit of the speaker line does not know when and from which line. In FIG. 5, it is preferable to wait for a signal of the speaker line short circuit while the value of the S-R flip-flop is '1'.

The short signal detecting step (S300) is a step in which the microcomputer determines whether a short signal is detected by determining signals output from the SR flip flops of each channel in the plurality of speaker line channels. When the SR flip flops are in the standby state, " 1 " If you input "0" to the input even if it is a very short time, it outputs "0" and keeps the value. The microcomputer scans the output of each SR flip-flop connected to a plurality of speaker wire channels, and if there is a channel whose value is changed from "1" to "0" in the standby state, it determines that there is a short signal and proceeds to the next storage step. Otherwise, it returns to the previous standby state.

In the short-signal storing step (S400), when "0" is input to the SR flip-flop and the output of '0' is transmitted to the controller, the controller reads the stored value of the corresponding channel from the short-signal buffer memory. Add to 1 and store again, and send RESET signal to the SR flip-flop to initialize again.

In the short state determination step (S500), when the value stored in the short signal buffer of all channels is read or greater than the preset value, it is determined that the corresponding channel is short-circuited and the process proceeds to the next transmission step. If no buffer value reaches the preset value, it returns to standby.

In the short-circuit state data transmission step (S600), the control unit displays data of a channel having a short circuit on the display unit and transmits the communication data to a main broadcasting apparatus located at a remote location. In the main broadcasting device, information about the short circuit channel is displayed on the display device 20 and the failure status information is also transmitted to the maintenance person.

As described above, the present invention has been described by specific embodiments such as specific components and the like. However, this is merely provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiment. However, various modifications and variations are possible to those skilled in the art to which the present invention pertains.

As the current blocking unit 300 on the speaker line L4, a fuse, a poly switch, and a capacitor may be used in part or two or more in parallel to detect a short circuit condition, and may supply various DC power supplies 400. The branch method and the detection method using the SR flip-flop may also be used together or constitute only part of the method for effective short-circuit detection according to field conditions, types of amplifiers, and number of channels of the speaker line L4.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and all the things equivalent to or equivalent to the claims as well as the following claims will fall within the scope of the present invention. .

1000: Short circuit detection device of speaker line
5: diode 6: constant voltage diode
10: input device
20: display device
30: communication unit
100: amplifier
200: speaker
300: current breaker
400: DC power
500: control unit
600: LED
700: current limiting resistor
800: Photocoupler
900: display unit 910: first display unit
920: second display unit 930: N-1 display unit
940: N-th display unit
L1: Amplifier Output Line
L2: Communication Line
L3: Amplifier Common Line
L4: Speaker Wire

Claims (12)

An input device for receiving a voice signal;
An amplifier connected to the input device to amplify the voice signal;
At least one speaker connected to the amplifier to output a broadcast;
A current blocking unit connected between the amplifier and the speaker by a speaker line and blocking the speaker wire when an over current flows due to a short circuit in the speaker wire;
A direct current power source connected to both ends of the current interrupting unit and supplying power to the speaker line;
A control unit connected to the speaker wire from the current interrupter to determine whether a short circuit occurs in the speaker wire, and including a microcomputer;
A photocoupler connected in parallel to both ends of the current interrupting unit and converting a change in current into light and converting the light into an electrical signal;
And an SR flip-flop connected between the control unit and the photo coupler, and maintaining the instantaneous short signal output from the photo coupler during audio output to accurately determine a short circuit of the speaker line at the microcomputer. Line short circuit detection device.
delete The method of claim 1,
LEDs connected in parallel to both ends of the current interrupting unit to directly display a short circuit occurrence state of the speaker line; Short circuit detection device of the speaker line further comprises.
The method of claim 3, wherein
The LED,
And a power supply is supplied from the DC power supply when the current interrupting unit is operated, and is turned off when a short circuit does not occur in the speaker line.
The method of claim 4, wherein
It is provided between the current blocking unit and the DC power supply,
And a current limiting resistor provided between the current interrupting unit and the LED.
The method of claim 4, wherein
And a constant voltage diode provided between the current interrupting unit and the LED and supplying a constant voltage to the LED.
delete The method of claim 1,
The current blocking unit,
Short circuit detection device of a speaker line comprising at least one of a fuse and a poly switch or a capacitor.
The method of claim 1,
A display unit connected to the controller to display whether the speaker line is shorted; Short circuit detection device of the speaker line further comprises.
The method of claim 1,
A display device connected to the control unit through a communication line to receive whether the speaker line is short-circuited by communication and to display a shorted channel; Short circuit detection device of the speaker line further comprises.
The method of claim 1,
A communication unit connected to the control unit through a communication line to receive whether the speaker line is short-circuited by communication and to remotely transmit the short-circuited state; Short circuit detection device of the speaker line further comprises.
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