Emergency broadcasting system for television

Abstract

The utility model discloses a broadcasting television emergency backup broadcasting system relates to broadcasting television technical field. The system includes emergency switching module, backup broadcasting transmitter and sky feeder, and emergency switching module receives the incident power level of main use and backup transmitter, when both are low level (that is all failure), drive backup broadcasting transmitter to open, and its radio frequency signal is through sky feeder to bread antenna emission. Emergency switching module contains or door, drive relay, delay relay and ac contactor, and or door receives main backup machine power level, and the output level signal controls drive relay, and drive relay normally closed end is through delay relay and is connected ac contactor coil, and ac contactor controls backup broadcasting transmitter power supply. The utility model is independent with original 1+1, N+1 system, can start backup broadcasting when main, backup transmitter all failure, forms threefold guarantee, improves the reliability of broadcasting, and the structure is simple, and the response is in time, effectively avoids the interruption in broadcasting, and the ability of guaranteeing safe broadcasting is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of broadcasting and television technology, specifically to an emergency backup broadcasting system that ensures uninterrupted broadcasting of broadcasting and television signals. Background Technology

[0002] In the field of broadcast television, continuous and stable signal transmission is crucial. To ensure safe broadcasting, the station has adopted a 1+1 (1 main unit with 1 backup unit) and N+1 (N main units with 1 backup unit) mode, and each transmitter is also equipped with a primary and backup exciter.

[0003] The 1+1 system currently used by the station is as follows: Figure 1 As shown. When the primary transmitter fails, the system automatically shuts it down; the coaxial switch then automatically switches to connect the backup transmitter to the hard feed line; the backup transmitter starts up, and its signal is transmitted to the multiplexer through the hard feed line; the multiplexer performs power combining, frequency isolation and impedance matching, and then sends the signal to the switch board through the hard feed line; the switch board selects one of the two soft feed lines to transmit the signal to the bread antenna, and finally the bread antenna radiates the radio frequency signal into space.

[0004] After the nationwide implementation of the 700 MHz frequency migration for terrestrial digital television was completed, a number of high-value equipment, such as analog television antenna feeders, digital television transmitters, and digital television repeaters, were left idle. Some stations proposed improvements, such as... Figure 2 Based on the existing system, additional equipment transmitters, dummy loads, and coaxial switches are added. When both the primary and backup transmitters fail to function properly, staff must manually shut down the first coaxial switch, activate the second coaxial switch, and connect the backup transmitter to the multiplexer via a hard feeder. The drawbacks are: staff must quickly pinpoint the fault location, confirming that both the primary and backup transmitters are malfunctioning simultaneously, immediately shutting down both, closing the first coaxial switch, activating the second coaxial switch, and then activating the backup transmitter. This process tests the staff's emergency response and handling capabilities, is time-consuming and uncertain, and cannot effectively guarantee safe broadcasting. Furthermore, if the antenna feeder system malfunctions, even if the backup transmitter can be activated promptly, the radio frequency signal cannot accurately and timely reach the bread antenna via the antenna feeder line, failing to achieve timely radiation coverage. This is unacceptable during regular broadcast hours, as well as during critical periods and key times.

[0005] Therefore, there is an urgent need to propose a broadcast television emergency backup system that is not limited by the original signal source system, transmitter system, and antenna feeder system, and can be automatically activated in a timely manner when the original system cannot broadcast normally. Utility Model Content

[0006] This utility model provides an emergency backup broadcasting system for radio and television, which solves the problem of "insufficient ability to ensure safe broadcasting" in the existing technology.

[0007] This utility model solves the technical problem through the following technical solution:

[0008] A broadcast television emergency backup system includes an emergency switching module, a backup transmitter, and an antenna feeder. The emergency switching module receives the incident power levels of an external primary transmitter and a backup transmitter. When both incident power levels are low, it drives the backup transmitter to turn on. The radio frequency signal output by the backup transmitter is connected to an external bread antenna through the antenna feeder.

[0009] Furthermore, the emergency switching module includes an OR gate, a drive relay, and an AC contactor; the incident power level of the external primary transmitter is input to one input terminal of the OR gate, and the incident power level of the external backup transmitter is input to the other input terminal of the OR gate; the output terminal of the OR gate is connected to one end of the drive relay coil; the other end of the drive relay coil is grounded; the common terminal of the drive relay is connected to the external live wire; the normally closed terminal of the drive relay is connected to one end of the AC contactor coil; the normally open terminal of the drive relay is unconnected; the other end of the AC contactor coil is connected to the external neutral wire; the three normally closed terminals of the AC contactor are unconnected; the three normally open terminals of the AC contactor are respectively connected to the three-phase power input terminals of the backup transmitter, and the three common terminals of the AC contactor are respectively connected to the external live wire.

[0010] Furthermore, the emergency switching module also includes a time-delay relay; the normally closed terminal of the drive relay is connected to one end of the time-delay relay coil, and the other end of the time-delay relay coil is connected to an external neutral wire; the common terminal of the time-delay relay is connected to an external live wire, and the normally closed terminal of the time-delay relay is unconnected; the normally open terminal of the time-delay relay is connected to one end of the AC contactor coil.

[0011] Compared with existing technologies, it has the following characteristics:

[0012] 1. This utility model is equipped with an emergency switching module, which uses the incident power level of the primary transmitter and the backup transmitter as the judgment benchmark. When both are at a low level, the backup transmitter is automatically started without manual intervention, which greatly shortens the emergency response time of the staff and the shutdown and startup waiting time of the primary and backup transmitters, and improves the emergency response speed. The backup transmitter is connected to the bread antenna through an independent antenna feeder, forming an emergency broadcast channel independent of the original antenna feeder system of the primary and backup transmitters, further isolating the risk of failure and reducing the probability and duration of broadcast interruption. This utility model, together with the original 1+1 and N+1 systems, jointly constructs a "primary-backup-emergency" triple protection mechanism, which significantly improves the redundancy and security of the station system and enhances the station's safe broadcasting capability.

[0013] 2. This utility model does not restrict the source of the signal source. Whether it is a central radio and television program that uses a satellite single-frequency network signal source, a local program that uses a multi-frequency network signal source (satellite, fiber optic, microwave), or a medium wave or FM broadcasting system, as long as the backup transmitter meets the broadcast requirements, this system can be installed. The installation is simple and convenient.

[0014] 3. Given that the original main and backup transmitters of the broadcasting system require a certain amount of time to shut down, in order to ensure that both the original main and backup transmitters are in a powered-off state before the backup transmitter is started, this utility model adds a time delay relay to the emergency switching module. This can effectively prevent the emergency backup broadcasting system from being mistakenly started due to non-continuous faults such as instantaneous power fluctuations, brief power outages, or interference from the main or backup transmitters, thus ensuring the accuracy and stability of the system's operation.

[0015] 4. Since this utility model is independent of the original signal source system, transmission system and antenna feeder system, in the standby broadcast state, the original system does not need to perform fault analysis, fault location, fault repair and joint debugging and verification within the limited designated downtime. It can carry out maintenance work as soon as possible, restore normal working state in a timely manner, and significantly improve the maintenance efficiency in the process of safe broadcasting.

[0016] 5. After the nationwide implementation of the 700 MHz frequency migration for terrestrial digital television is completed, high-value equipment such as analog television antenna feeders, digital television transmitters, and digital television triplexers will be idle. These devices can be reused and upgraded to meet the broadcast television program requirements of designated frequencies and points, and then used to build the emergency backup broadcast system of this utility model. This eliminates the need for huge investments in purchasing backup broadcast transmitters and antenna feeders, significantly reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the principle structure of the existing 1+1 system.

[0018] Figure 2 A schematic diagram illustrating the principle and structure of manually implementing backup broadcasting using existing technology.

[0019] Figure 3 This is a schematic diagram of the structure of this utility model.

[0020] Figure 4 This is a block diagram illustrating the structural principle of the emergency switching module. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] A broadcast television emergency backup system includes an emergency switching module, a backup transmitter, and an antenna feeder. The emergency switching module receives the incident power levels of an external primary transmitter and a backup transmitter. When both incident power levels are low, it drives the backup transmitter to turn on. The radio frequency signal output by the backup transmitter is connected to an external bread antenna via the antenna feeder. The structural principle block diagram is shown below. Figure 3 As shown.

[0023] The emergency switching module is the core control part. Its input terminal receives the incident power level signals from the external primary transmitter and the external backup transmitter. These incident power level signals are provided by the power monitoring circuits of the primary and backup transmitters themselves. When the transmitter is working normally, it outputs a high level (or a specific level representing normal power). When the transmitter malfunctions and has no power output or the power is severely insufficient, it outputs a low level.

[0024] The emergency switching module includes an OR gate, a drive relay, and an AC contactor. The incident power level of the external primary transmitter is input to one input of the OR gate, and the incident power level of the external backup transmitter is input to the other input of the OR gate. The output of the OR gate is connected to one end of the drive relay coil. The other end of the drive relay coil is grounded. The common terminal of the drive relay is connected to the external live wire. The normally closed terminal of the drive relay is connected to one end of the AC contactor coil. The normally open terminal of the drive relay is unconnected. The other end of the AC contactor coil is connected to the external neutral wire. The three normally closed terminals of the AC contactor are unconnected. The three normally open terminals of the AC contactor are respectively connected to the three-phase power input terminals of the backup transmitter, and the three common terminals of the AC contactor are respectively connected to the external live wire. The structural principle block diagram of the emergency switching module is shown below. Figure 4 As shown.

[0025] The incident power level signal of the primary transmitter is connected to one input (A) of an OR gate, and the incident power level signal of the backup transmitter is connected to the other input (B) of the OR gate. The logic function of the OR gate is: as long as either A or B is high, its output (Y) is high; only when both A and B are low, does Y output a low level. Accordingly, the backup transmitter will not be started if either the primary or backup transmitter has a high incident power level (i.e., at least one of the primary or backup transmitters is working normally); the backup transmitter will only be started when both are low (i.e., both the primary and backup transmitters are faulty). After the backup transmitter is started, the emergency broadcast radio frequency signal it generates is transmitted to an external bread antenna through an antenna feeder. The bread antenna radiates the signal into space, achieving emergency coverage of the broadcast television signal.

[0026] The Y terminal of the OR gate is connected to one end of the drive relay coil, and the common terminal (COM1) of the drive relay is connected to the external live wire. When the OR gate outputs a high level, the drive relay coil is energized, the normally open terminal (NO1) closes, and the normally closed terminal (NC1) opens. When the OR gate outputs a low level, the drive relay contacts return to their normal state, back to the normally closed terminal (NC1), and the voltage provided by the external live wire is applied to the coil of the AC contactor, energizing it.

[0027] The AC contactor is a three-phase AC contactor. Its three common terminals (COM3, COM4, ​​COM5) are connected to the external three-phase live wires (L1, L2, L3), respectively. Its three normally closed terminals (NC3, NC4, NC5) are unconnected, and its three normally open terminals (NO3, NO4, NO5) are connected to the three-phase power input terminals of the standby transmitter. When the AC contactor coil is energized, its contacts actuate, the normally open terminals are connected, and the external three-phase live wires are applied to the standby transmitter, supplying power and starting the transmitter. When the AC contactor coil is de-energized, the contacts return to their initial normally closed state, the external three-phase live wires are no longer applied to the power supply terminals of the standby transmitter, and the transmitter cannot be started.

[0028] Furthermore, to avoid system malfunctions, this invention adds a time-delay relay to the emergency switching module, introducing a preset delay time (e.g., 3-10 seconds, adjustable according to actual needs) to prevent the emergency backup broadcast system from being mistakenly started due to non-continuous faults such as instantaneous power fluctuations, brief power outages, or interference from the primary or backup transmitter. The emergency switching module also includes a time-delay relay; the normally closed terminal of the driving relay is connected to one end of the time-delay relay coil, and the other end of the time-delay relay coil is connected to an external neutral wire; the common terminal of the time-delay relay is connected to an external live wire, and the normally closed terminal of the time-delay relay is unconnected; the normally open terminal of the time-delay relay is connected to one end of the AC contactor coil.

[0029] The normally closed terminal (NC1) of the drive relay is connected to one end of the time delay relay coil, and the other end of the time delay relay coil is connected to the external neutral line (N line). The common terminal (COM2) of the time delay relay is also connected to the external live wire, and its normally open terminal (NO2) is connected to one end of the AC contactor coil; the other end of the AC contactor coil is connected to the external neutral line. When the drive relay coil is de-energized, the common terminal COM1 is connected to the normally closed terminal NC1, and the voltage of the live wire is applied to the coil of the time delay relay, energizing it. After the delay ends, if the drive relay remains de-energized (i.e., the fault condition continues), the normally closed terminal NC2 of the time delay relay opens, and the normally open terminal NO2 closes. When the time delay relay coil is energized and after a preset delay, if its normally open terminal is still closed (indicating that the main / standby fault condition continues), the AC contactor coil is energized, and the external three-phase live wire is connected to the three-phase power input terminal of the standby transmitter.

[0030] The working process of this utility model is as follows: When at least one of the main transmitter and the backup transmitter is working normally, the OR gate receives the (1,0), (0,1), or (1,1) signal and outputs a high-level 1 signal, driving the normally open terminal of the relay to close. Since the normally open terminal is unconnected, the backup broadcast system does not respond at all. When both the main transmitter and the backup transmitter fail simultaneously, the OR gate receives two low-level signals (0,0) and outputs a low-level signal, driving the relay coil to de-energize. The contacts return to their initial state, and the normally closed terminal link applies the external live wire voltage to the coil of the time delay relay. The normally open terminal link of the time delay relay closes, applying the external live wire voltage to the coil of the AC contactor. The three normally open terminal links of the AC contactor close, applying the external three-phase live wire voltage to the three-phase power input terminal of the backup broadcast transmitter. The backup broadcast transmitter starts, and the generated radio frequency signal is sent to the bread antenna through the antenna feeder. The bread antenna radiates the radio frequency signal into space.

Claims

1. A broadcast television emergency backup system, characterized in that: This includes an emergency switching module, a backup transmitter, and antenna feeders; The emergency switching module receives the incident power levels of the external primary transmitter and the backup transmitter. When both incident power levels are low, it drives the backup transmitter to turn on. The radio frequency signal output by the backup transmitter is connected to the external bread antenna through the antenna feeder.

2. The emergency backup broadcasting system for radio and television according to claim 1, characterized in that: The emergency switching module includes an OR gate, a drive relay, and an AC contactor; The incident power level of the external primary transmitter is input to one input of the OR gate, and the incident power level of the external backup transmitter is input to the other input of the OR gate; the output of the OR gate is connected to one end of the drive relay coil. The other end of the drive relay coil is grounded; the common terminal of the drive relay is connected to an external live wire; the normally closed terminal of the drive relay is connected to one end of the AC contactor coil; the normally open terminal of the drive relay is unconnected. The other end of the AC contactor coil is connected to the external neutral wire; the three normally closed terminals of the AC contactor are unconnected; the three normally open terminals of the AC contactor are respectively connected to the three-phase power input terminals of the standby transmitter; and the three common terminals of the AC contactor are respectively connected to the external live wire.

3. The broadcast television emergency backup system according to claim 2, characterized in that: The emergency switching module also includes a time-delay relay; the normally closed terminal of the driving relay is connected to one end of the coil of the time-delay relay, and the other end of the coil of the time-delay relay is connected to the external neutral wire; the common terminal of the time-delay relay is connected to the external live wire, and the normally closed terminal of the time-delay relay is unconnected. The normally open terminal of the time delay relay is connected to one end of the AC contactor coil.

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