阅读说明：本技术 广播系统防雷控制装置 (Lightning protection control device of broadcasting system ) 是由 王柳毅 裴李狮 于 2021-08-10 设计创作，主要内容包括：本发明涉及信号线路防雷技术领域,具体涉及广播系统防雷控制装置。包括包括防雷控制箱和防雷地线,防雷地线与防雷控制箱连接；防雷控制箱设在广播系统中的广播线路上,且防雷控制箱与广播系统中的功率放大器信号对接；防雷控制箱用于对功率放大器进行音频信号的输出检测,并在检测到功率放大器输出音频信号时,将功率放大器的输出端与广播线路连接导通,在未检测到功率放大器输出有音频信号时,将功率放大器的输出端与广播线路断开,并将广播线路与防雷地线连接导通。本发明通过主动式的防雷设计,可以有效提高广播系统的防雷可靠性。(The invention relates to the technical field of signal line lightning protection, in particular to a lightning protection control device of a broadcasting system. The lightning protection device comprises a lightning protection control box and a lightning protection ground wire, wherein the lightning protection ground wire is connected with the lightning protection control box; the lightning protection control box is arranged on a broadcasting line in the broadcasting system and is in signal butt joint with a power amplifier in the broadcasting system; the lightning protection control box is used for outputting and detecting audio signals to the power amplifier, connecting and conducting the output end of the power amplifier with the broadcasting line when detecting that the power amplifier outputs the audio signals, disconnecting the output end of the power amplifier with the broadcasting line when not detecting that the power amplifier outputs the audio signals, and connecting and conducting the broadcasting line with the lightning protection ground wire. The invention can effectively improve the lightning protection reliability of the broadcasting system through the active lightning protection design.)

1. The lightning protection control device of the broadcasting system is characterized in that: the lightning protection device comprises a lightning protection control box and a lightning protection ground wire, wherein the lightning protection ground wire is connected with the lightning protection control box; the lightning protection control box is arranged on a broadcasting line in the broadcasting system and is in signal butt joint with a power amplifier in the broadcasting system; the lightning protection control box is used for outputting and detecting audio signals to the power amplifier, connecting and conducting the output end of the power amplifier with the broadcasting line when detecting that the power amplifier outputs the audio signals, disconnecting the output end of the power amplifier with the broadcasting line when not detecting that the power amplifier outputs the audio signals, and connecting and conducting the broadcasting line with the lightning protection ground wire.

2. The lightning protection control device of a broadcasting system according to claim 1, wherein: the lightning protection control box comprises an output detection control module and a relay module, wherein the relay module is arranged in a broadcasting line and used for connecting and switching the broadcasting line, a power amplifier and a lightning protection ground wire, the input end of the output detection control module is connected with the output end of the power amplifier, the output end of the output detection control module is connected with the relay module, the output detection control module is used for outputting and detecting audio signals to the power amplifier, when the audio signals output by the power amplifier are detected, the relay module is controlled to be switched to be connected with the broadcasting line, and when the audio signals are not output by the power amplifier, the relay module is controlled to be switched to be connected with the lightning protection ground wire.

3. The lightning protection control device of a broadcasting system according to claim 2, characterized in that: the relay module includes the relay, the relay contains two sets of contacts, every group contact contains well contact, upper junction and lower junction, wherein, lower junction butt joint power amplifier's output, well contact butt joint broadcasting line, upper junction butt joint lightning protection ground wire, when output detection control module detects there is audio signal output, control relay actuation, make well contact and lower junction closed, the power amplifier output is connected with broadcasting line, when output detection control module does not survey audio signal output, control relay release, make well contact and upper junction closed, broadcasting line is to the ground short circuit, play the lightning protection effect.

4. The lightning protection control device of a broadcasting system according to claim 2, characterized in that: the output detection control module comprises a signal amplifier, a detection diode, a capacitor, a comparator and a switch triode which are sequentially connected, the signal amplifier is connected with the power amplifier in a butt joint mode and used for amplifying an output signal of the power amplifier, the detection diode is used for extracting an audio signal of a signal output by the signal amplifier and charging the capacitor through the extracted audio signal, the capacitor is used for charging and inputting a voltage signal to be detected into the comparator, a set comparison voltage signal is further input into the comparator, the comparator is used for comparing the voltage signal to be detected input into the capacitor with the set comparison electric signal, when the voltage value of the voltage signal to be detected is higher than the comparison electric signal, a high level is output, otherwise, a low level is output, the input end of the switch triode is in butt joint with the output end of the comparator, and the output control end of the switch triode is in butt joint with the control relay module, the switching triode is conducted when receiving the high level output by the comparator, outputs a control signal, and is cut off when receiving the low level output by the comparator, and the control signal output when the switching triode is conducted is used for controlling the relay module to be switched to be connected with the power amplifier and the broadcasting line.

5. The lightning protection control device of claim 4, wherein: the signal amplifier comprises a transformer and a triode amplifying circuit, wherein the transformer is used for carrying out voltage amplification on an output signal of the power amplifier, and the triode amplifying circuit is used for carrying out current amplification on the output signal of the power amplifier.

6. The lightning protection control device of claim 4, wherein: the detection diode is a 1N4148 type diode, the capacitor is a 10uF capacitor, the comparator is an LM339 type comparator, and the switching triode is a 9013 type triode.

7. The lightning protection control device of a broadcasting system according to claim 2, characterized in that: the lightning protection control box is also provided with a lightning protection unit, the lightning protection unit is used for carrying out overvoltage protection on the broadcasting line, and the lightning protection unit comprises a discharge tube which is connected in parallel at the output end of the power amplifier.

8. The lightning protection control device of a broadcasting system according to claim 7, wherein: the discharge tube is a ceramic gas discharge tube, and the grounding end of the discharge tube is in butt joint with a lightning protection ground wire.

9. The lightning protection control device of a broadcasting system according to claim 7, wherein: the lightning protection unit further comprises an overvoltage protection circuit connected in parallel with the output end of the power amplifier, and the overvoltage protection circuit comprises a rectifier bridge and a transient voltage suppression diode.

10. The lightning protection control device of a broadcasting system according to claim 1, wherein: the input end of the lightning protection control box is provided with an input butt-joint terminal, the output end of the lightning protection control box is provided with an output butt-joint terminal, and the lightning protection control box is in butt joint with the output end of the power amplifier through the input butt-joint terminal and is in butt joint with the broadcast line through the output butt-joint terminal.

Technical Field

The invention relates to the technical field of signal line lightning protection, in particular to a lightning protection control device of a broadcasting system.

Background

The public broadcasting system mainly comprises a broadcasting loudspeaker, a power amplifier, a broadcasting line, a management/control device (comprising hardware and software), a paging device, a microphone and other signal source devices, wherein the power amplifier is used for amplifying the power of an audio signal sent by a preamplifier or a sound console and then transmitting the amplified audio signal to the loudspeaker for sound reproduction through the broadcasting line. The public broadcasting system can provide background music and broadcasting programs for railways, hotels, shopping malls, ports, airports, schools and the like, can also be used as emergency broadcasting, and can be linked with a fire-fighting alarm system. Public address systems are typically designed starting with the sound field (i.e., the placement of the speakers) and then progressing back to the power amplifiers, sound processing systems, sound mixing consoles to the microphone and other sound sources.

The public broadcasting system has more operation environmental factors which need to be considered in the using process, one important point is the lightning protection design, the public broadcasting system is used outdoors, and once the lightning protection is not over, the system is easily damaged by lightning stroke. The existing lightning protection design of the public broadcasting system mostly adopts a discharge tube (when the voltage at two ends is higher than the protection specification value, a short circuit can appear inside the discharge tube to protect an access circuit) to carry out internal and external protection and overvoltage protection, but the mode is a passive defense mode, the situation of untimely reaction is easy to occur, and the lightning protection effect and the reliability are not good enough.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the lightning protection control device of the broadcasting system, which can effectively improve the lightning protection reliability of the broadcasting system through an active lightning protection design during application.

The technical scheme adopted by the invention is as follows:

the lightning protection control device of the broadcasting system comprises a lightning protection control box and a lightning protection ground wire, wherein the lightning protection ground wire is connected with the lightning protection control box; the lightning protection control box is arranged on a broadcasting line in the broadcasting system and is in signal butt joint with a power amplifier in the broadcasting system; the lightning protection control box is used for outputting and detecting audio signals to the power amplifier, connecting and conducting the output end of the power amplifier with the broadcasting line when detecting that the power amplifier outputs the audio signals, disconnecting the output end of the power amplifier with the broadcasting line when not detecting that the power amplifier outputs the audio signals, and connecting and conducting the broadcasting line with the lightning protection ground wire.

Preferably, the lightning protection control box includes an output detection control module and a relay module, the relay module is arranged in the broadcast line and is used for switching the broadcast line, the power amplifier and the lightning protection ground wire, an input end of the output detection control module is connected to an output end of the power amplifier, an output end of the output detection control module is connected to the relay module, the output detection control module is used for performing output detection of an audio signal to the power amplifier, when the power amplifier is detected to output the audio signal, the relay module is controlled to be switched to be connected with the broadcast line, and when the power amplifier is detected not to output the audio signal, the relay module is controlled to be switched to be connected with the lightning protection ground wire.

Preferably, the relay module comprises a relay, the relay comprises two groups of contacts, each group of contacts comprises a middle contact, an upper contact and a lower contact, the lower contact is in butt joint with the output end of the power amplifier, the middle contact is in butt joint with the broadcasting line, the upper contact is in butt joint with the lightning protection ground wire, when the output detection control module detects that the audio signal is output, the relay is controlled to be sucked, the middle contact and the lower contact are closed, the output end of the power amplifier is connected with the broadcasting line, when the output detection control module does not detect the audio signal output, the relay is controlled to be released, the middle contact and the upper contact are closed, the broadcasting line is in short circuit with the ground, and the lightning protection effect is achieved.

Preferably, as the above technical solution, the output detection control module includes a signal amplifier, a detection diode, a capacitor, a comparator and a switching triode which are connected in sequence, the signal amplifier is connected to the power amplifier in a butt joint manner and is used for amplifying an output signal of the power amplifier, the detection diode is used for extracting an audio signal from a signal output by the signal amplifier and charging the capacitor through the extracted audio signal, the capacitor is used for inputting a voltage signal to be measured to the comparator after charging, the comparator further inputs a set comparison voltage signal, the comparator is used for comparing the voltage signal to be measured input by the capacitor with the set comparison electrical signal, when the voltage value of the voltage signal to be measured is higher than the comparison electrical signal, a high level is output, otherwise, a low level is output, the input end of the switching triode is connected to the output end of the comparator, the output control end of the switch triode is in butt joint with the control relay module, the switch triode is conducted when receiving the high level output by the comparator and outputs a control signal, the switch triode is cut off when receiving the low level output by the comparator, and the control signal output when the switch triode is conducted is used for controlling the relay module to be switched to be connected with the power amplifier and the broadcasting circuit.

Preferably, the signal amplifier includes a transformer and a triode amplifier circuit, the transformer is used for performing voltage amplification on the output signal of the power amplifier, and the triode amplifier circuit is used for performing current amplification on the output signal of the power amplifier.

Preferably, in the above technical solution, the detector diode is a 1N4148 type diode, the capacitor is a 10uF capacitor, the comparator is an LM339 type comparator, and the switching transistor is a 9013 type transistor.

Preferably, the lightning protection control box is further provided with a lightning protection unit, the lightning protection unit is used for performing overvoltage protection on the broadcasting line, and the lightning protection unit comprises a discharge tube, and the discharge tube is connected in parallel with the output end of the power amplifier.

Preferably, the discharge tube is a ceramic gas discharge tube, and the grounding end of the discharge tube is butted with a lightning protection grounding wire.

Preferably, the lightning protection unit further includes an overvoltage protection circuit connected in parallel to the output terminal of the power amplifier, and the overvoltage protection circuit includes a rectifier bridge and a transient voltage suppression diode.

Preferably, the input end of the lightning protection control box is provided with an input butt-joint terminal, the output end of the lightning protection control box is provided with an output butt-joint terminal, and the lightning protection control box is in butt joint with the output end of the power amplifier through the input butt-joint terminal and is in butt joint with the broadcast line through the output butt-joint terminal.

The invention has the beneficial effects that:

the invention can detect the output signal of the power amplifier through the lightning protection control box, when detecting that the power amplifier outputs the audio signal, the output end of the power amplifier is connected and conducted with the broadcasting line, when the power amplifier does not output the audio signal, the output end of the power amplifier is disconnected with the broadcasting line, and the broadcasting line is connected and conducted with the lightning protection ground wire, therefore, when the audio signal is not output, the broadcasting line is not connected with the broadcasting system at the front end, the broadcasting line is grounded to carry out active lightning protection, only when the lightning protection control box detects the audio signal, the lightning protection control box butt-joints the broadcasting line with the broadcasting system at the front end, and the audio signal is transmitted to the rear-end playing equipment through the broadcasting line to be played. The broadcasting system is not started most of the time, and the reliability and the effect of lightning protection can be effectively improved through the active lightning protection design. The lightning protection unit is arranged to perform overvoltage protection on the broadcasting line at the rear end of the power amplifier, so that damage to broadcasting system devices caused by lightning in the transmission process of audio signals is prevented.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic connection diagram of a lightning protection control device in embodiment 1;

FIG. 2 is a schematic structural diagram of a lightning protection control box in embodiment 2;

fig. 3 is a schematic circuit structure diagram of the lightning protection control box.

Detailed Description

The invention is further described with reference to the following figures and specific embodiments. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Specific structural and functional details disclosed herein are merely illustrative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.

It should be understood that the terms first, second, etc. are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance. Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments of the present invention.

It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, B exists alone, and A and B exist at the same time, and the term "/and" is used herein to describe another association object relationship, which means that two relationships may exist, for example, A/and B, may mean: a alone, and both a and B alone, and further, the character "/" in this document generally means that the former and latter associated objects are in an "or" relationship.

It is to be understood that in the description of the present invention, the terms "upper", "vertical", "inside", "outside", and the like, refer to an orientation or positional relationship that is conventionally used for placing the product of the present invention, or that is conventionally understood by those skilled in the art, and are used merely for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present invention.

It will be understood that when an element is referred to as being "connected," "connected," or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly adjacent" or "directly coupled" to another element, there are no intervening elements present. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", etc.).

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and/or groups thereof.

It should also be noted that, in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed substantially concurrently, or the figures may sometimes be executed in the reverse order, depending upon the functionality/acts involved.

In the following description, specific details are provided to facilitate a thorough understanding of example embodiments. However, it will be understood by those of ordinary skill in the art that the example embodiments may be practiced without these specific details. For example, systems may be shown in block diagrams in order not to obscure the examples in unnecessary detail. In other instances, well-known processes, structures and techniques may be shown without unnecessary detail in order to avoid obscuring example embodiments.

Example 1:

the embodiment provides a lightning protection control device for a broadcasting system, as shown in fig. 1:

the lightning protection device comprises a lightning protection control box and a lightning protection ground wire, wherein the lightning protection ground wire is connected with the lightning protection control box; the lightning protection control box is arranged on a broadcasting line in the broadcasting system and is in signal butt joint with a power amplifier in the broadcasting system; the lightning protection control box is used for outputting and detecting audio signals to the power amplifier, connecting and conducting the output end of the power amplifier with the broadcasting line when detecting that the power amplifier outputs the audio signals, disconnecting the output end of the power amplifier with the broadcasting line when not detecting that the power amplifier outputs the audio signals, and connecting and conducting the broadcasting line with the lightning protection ground wire.

When the audio-frequency signal is detected by the lightning protection control box, the output end of the power amplifier is connected and conducted with the broadcasting line, when the audio-frequency signal is detected to be output by the power amplifier, the output end of the power amplifier is disconnected with the broadcasting line, the broadcasting line is connected and conducted with the lightning protection ground wire, when no audio-frequency signal is output, the broadcasting line is not connected with the broadcasting system at the front end, active lightning protection is carried out on the grounding of the broadcasting line, only when the audio-frequency signal is detected by the lightning protection control box, the lightning protection control box butt-joints the broadcasting line with the broadcasting system at the front end, and the audio-frequency signal is transmitted to the rear-end playing equipment through the broadcasting line to be played. The broadcasting system is not started most of the time, and the reliability and the effect of lightning protection can be effectively improved through the active lightning protection design.

Example 2:

as an optimization of the above embodiment, as shown in fig. 2, the lightning protection control box includes an output detection control module and a relay module, where the relay module is disposed in the broadcast line and is configured to connect and switch the broadcast line with the power amplifier and the lightning protection ground wire, an input end of the output detection control module is connected to an output end of the power amplifier, an output end of the output detection control module is connected to the relay module, the output detection control module is configured to perform output detection on an audio signal of the power amplifier, and when detecting that the audio signal is output by the power amplifier, the relay module is controlled to switch to connect the power amplifier with the broadcast line, and when detecting that the audio signal is not output by the power amplifier, the relay module is controlled to switch to connect the broadcast line with the lightning protection ground wire.

The relay module includes the relay, and the relay contains two sets of contacts, and every group contact contains well contact, top connection and lower junction, and wherein, the output of lower junction butt joint power amplifier, well contact butt joint broadcasting line, top connection butt joint lightning protection ground wire, when the relay is in the normality, well contact and top connection are closed. The closing of the broadcasting line and the lightning protection ground wire disconnects the output end of the power amplifier from the broadcasting line, the broadcasting line is connected and conducted with the lightning protection ground wire, the radar is in short circuit with the ground, the thunder and lightning can not enter the amplifier, and active lightning protection is achieved. When the output detection control module detects the audio signal, the output detection control module controls the relay to act, and the relay is closed to connect the broadcast line and the output end of the power amplifier, so that the output end of the power amplifier is connected and conducted with the broadcast line.

Example 3:

as an optimization of the above embodiment, as shown in fig. 3, the output detection control module includes a signal amplifier, a detector diode D4, a capacitor C3, a comparator U1 and a switching transistor T2, which are connected in sequence, the signal amplifier is connected to the power amplifier and is used for amplifying an output signal of the power amplifier, the detector diode D4 is used for extracting an audio signal from a signal output by the signal amplifier and charging a capacitor C3 with the extracted audio signal, the capacitor C3 is used for charging and inputting a voltage signal to be measured to the comparator U1, the comparator U1 is further input with a set comparison voltage signal, the comparator U1 is used for comparing the voltage signal to be measured input by the capacitor C3 with the set comparison electrical signal, and when the voltage value of the voltage signal to be measured is higher than the comparison electrical signal, a high level is output, otherwise, a low level is output, the input end of the switching triode T2 is in butt joint with the output end of the comparator U1, the output control end of the switching triode T2 is in butt joint with the control relay module, the switching triode T2 is conducted when receiving the high level output by the comparator U1, and outputs a control signal, the switching triode T2 is turned on when receiving the low level output by the comparator U1, and the control signal output when the switching triode T2 is turned on is used for controlling the relay module to be switched to be connected with the power amplifier and the broadcasting line. The detector diode is used to extract a low-frequency signal or an audio signal from a radio signal by utilizing its one-way conductivity, and is widely used in small-signal circuits of devices such as semiconductor radios, radio recorders, televisions, and communications. The audio signal of the output of the power amplifier can be efficiently detected by the detector diode D4, and the capacitor C3 is charged with the audio signal. After the capacitor C3 is charged, a stable voltage signal to be detected can be continuously input into the comparator U1, until the charging process of the audio signal is finished, the comparator U1 compares the voltage signal to be detected input into the capacitor C3 with a set comparison electrical signal (1.1V), and when the voltage value of the voltage signal to be detected, which is stably and continuously input, is higher than the comparison electrical signal, the comparator U1 continuously outputs a high level, so that the switching triode T2 is continuously conducted, and the relay module is controlled to keep the connection between the power amplifier and the broadcast line until the audio signal is finished.

The signal amplifier comprises a transformer T0 and a triode amplifying circuit (comprising a triode T1), wherein the transformer T0 is used for carrying out voltage amplification on an output signal of the power amplifier, and the triode amplifying circuit is used for carrying out current amplification on the output signal of the power amplifier. The detection diode D4 selects a 1N4148 type diode, the capacitor C3 selects a 10uF capacitor, the comparator U1 selects an LM339 type comparator, and the switch triode T2 selects a 9013 type triode.

Example 4:

as an optimization of the above embodiment, the input end of the lightning protection control box is provided with an input butt terminal, the output end of the lightning protection control box is provided with an output butt terminal, and the lightning protection control box is in butt joint with the output end of the power amplifier through the input butt terminal and is in butt joint with the broadcast line through the output butt terminal.

Lightning protection control box still is equipped with the lightning protection unit, and the lightning protection unit is used for carrying out overvoltage protection to the broadcast line, the lightning protection unit includes discharge tube GDT1 and overvoltage crowbar, and discharge tube GDT1 connects in parallel at power amplifier's output, and overvoltage crowbar also connects in parallel at power amplifier's output, and discharge tube GDT1 chooses for use ceramic gas discharge tube, and discharge tube GDT 1's earthing terminal docks lightning protection earth wire, and overvoltage crowbar includes rectifier bridge D1 and transient voltage suppression diode D2. When it is used, can carry out overvoltage protection to the circuit of power amplifier rear end through discharge tube GDT1 and overvoltage crowbar, when power amplifier has audio signal output, output detection control module detects audio signal, control relay module keeps being connected of power amplifier and broadcast line to carry out audio signal's transmission, at this in-process, discharge tube GDT1 and overvoltage crowbar just can carry out overvoltage crowbar to the broadcast line of power amplifier rear end, prevent that the thunder and lightning from causing the damage of device.

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.