A method, device and storage medium for switching between main and standby power amplifiers for public broadcasting

Abstract

The present invention discloses a method, device and storage medium for main-standby switching of a public broadcast power amplifier. The method is applied to a control module of the main-standby switching device of the public broadcast power amplifier. The main-standby switching device of the public broadcast power amplifier also includes: a plurality of main power amplifier modules and a backup power amplifier module; the backup power amplifier module is connected to the main power amplifier module with the highest priority, and the main power amplifier modules are connected in order from high to low priority; the method includes: when any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier module with lower priority is cut off, and the broadcast loudspeaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority, so as to realize main-standby switching according to the priority of the main power amplifier module in the case of single-chip main control setting or power supply damage, so that the broadcast loudspeaker of the main power amplifier module with the highest priority is connected to the backup power amplifier, thereby improving the main-standby switching efficiency of the power amplifier.

Description

Technical Field

[0001] The present invention relates to the technical field of public broadcasting, and in particular to a method, device and storage medium for switching a public broadcasting power amplifier between a master and a standby. Background Art

[0002] In existing broadcasting systems with master-slave switching functions, there are two master-slave switching solutions. One is to basically equip the power end with a master-slave switcher; the master-slave switcher switches the master-slave signals according to priority, then inputs them to the main and backup amplifiers, and finally enters the master-slave switcher to switch the master-slave power according to priority and output them to the speakers. The other is a highly integrated solution without a master-slave switcher. In network broadcasting applications, the master-slave signal switching is completed by the broadcast host switching the audio stream according to the priority set by the software; in analog signal master-slave switching applications, the signal switching is integrated into the backup amplifier through the backup amplifier, and the single-chip microcomputer master control switches the analog signal according to the priority set by the software to complete the master-slave signal switching; the power master-slave switching is completed by outputting the power output of the backup amplifier to the power backup input of the main amplifier 1, and then connecting it to the Nth main amplifier in turn. Then, the single-chip microcomputer master control of each main amplifier completes the switching according to the priority set by the software.

[0003] There are two main problems with the existing master-slave switching solution: first, the current solution with a master-slave switch is mainly composed of two main devices, and the integration is not high enough; second, the solution with a master-slave switch has many and complex wiring in the application scenario of multiple master amplifiers; third, although the integration of the solution without a master-slave switch is high enough, because its master-slave switching priority needs to be set and switched through the single-chip master control, when all the power supplies inside multiple main amplifiers are damaged, the backup amplifier will drive multiple faulty main amplifiers to trigger overload protection. The high-priority main amplifier cannot perform master-slave switching normally and the broadcast content will be in a mixed zone, which will lead to low master-slave switching efficiency of the amplifier and poor performance of the broadcast equipment. Summary of the Invention

[0004] The present invention provides a method, device and storage medium for switching the main and standby power amplifiers of a public broadcasting system, so as to realize the main and standby switching according to the priority of the main power amplifier module when the main control setting of the single-chip microcomputer or the power supply is damaged, so that the broadcast speaker of the main power amplifier module with the highest priority is connected to the standby power amplifier, thereby improving the efficiency of the main and standby switching of the power amplifiers.

[0005] The present invention provides a method for switching a public broadcast power amplifier between a master and a standby power amplifier, which is applied to a control module of a public broadcast power amplifier switching device. The public broadcast power amplifier switching device includes: a plurality of master power amplifier modules and a standby power amplifier module; the standby power amplifier module is connected to a first master power amplifier module with the highest priority, and the first master power amplifier module is connected to the remaining master power amplifier modules in descending order of priority;

[0006] The method comprises:

[0007] When any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier module with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority.

[0008] Furthermore, the standby power amplifier module is connected to the first main power amplifier module with the highest priority, and the first main power amplifier module is connected to the remaining main power amplifier modules in descending order of priority, specifically:

[0009] Each main power amplifier module has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and is connected in sequence through the backup input interface and backup output interface of each main power amplifier module in order from high to low priority.

[0010] Furthermore, before any one of the main power amplifier modules fails, the following steps are specifically performed:

[0011] The backup input interface and the backup output interface of each main power amplifier module are connected through a turned-on first relay, and the broadcast speakers of each main power amplifier module are connected to the output port of the respective main power amplifier module through a turned-on second relay.

[0012] Furthermore, when any one of the main power amplifier modules fails, the connection between the main power amplifier module and the main power amplifier modules with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority, which specifically includes:

[0013] When one or more main power amplifier modules fail and the power supply and single-chip main control of each main power amplifier module are not faulty, the main power amplifier module with the highest priority among the failed main power amplifier modules will be used as the second main power amplifier module, and the first relay and the second relay of the controlled second main power amplifier module will be closed to disconnect the connection between the backup input interface and the backup output interface of the second main power amplifier module, and the broadcast speaker of the second main power amplifier module will be connected to the backup input interface through the closed first relay and the second relay.

[0014] Furthermore, controlling the first relay and the second relay of the main power amplifier module to be closed is specifically as follows:

[0015] The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or data communication.

[0016] Furthermore, when any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier module with a lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with a higher priority, specifically including:

[0017] When the third main power amplifier module fails and the power supply of the third main power amplifier module is damaged, the third main power amplifier module is any one of the main power amplifier modules; the first relay and the second relay of the third main power amplifier module are in a normally closed state due to power failure, so that the connection between the backup input interface and the backup output interface of the second main power amplifier module is disconnected, and the broadcast speaker of the second main power amplifier module is connected to the backup input interface through the closed first relay and the second relay.

[0018] As a preferred solution, the present invention eliminates the need for an external master-slave switch. Instead, it utilizes the device types of a single backup amplifier and multiple main amplifiers to sequentially connect the amplifiers in order of priority. In the event of a main amplifier failure, the microcontroller master disconnects the low-priority main amplifier module. The disconnected main amplifier and its lower-priority counterparts lose their eligibility for master-slave switching. All main amplifiers with higher backup input priorities for the failed amplifier remain eligible for master-slave switching, ensuring that higher-priority main amplifiers can switch between master and backup before lower-priority ones. Furthermore, considering that the microcontroller master cannot operate in the event of a power failure, the present invention automatically disconnects the backup input interface and the backup output interface when the microcontroller master controls the first and second relays in a normally closed state. The connection is then automatically connected to the backup input interface of the main amplifier module, automatically connecting the broadcast speaker of the powered-off main amplifier to the backup input interface of the main amplifier module. By utilizing the relay states and the connection method for multiple main amplifiers, the present invention ensures that, even in the event of multiple powered-off main amplifiers, the higher-priority main amplifier can switch between master and backup before the lower-priority main amplifiers, thereby improving the efficiency of power amplifier master-slave switching.

[0019] Other features and advantages of the present invention will be described in detail in the following detailed description.

[0020] Accordingly, the present invention further provides a public broadcast power amplifier master-slave switching device, comprising: a control module, a plurality of master power amplifier modules and a backup power amplifier module; the backup power amplifier module is connected to a first master power amplifier module with the highest priority, and the first master power amplifier module is connected to the remaining master power amplifier modules in descending order of priority;

[0021] The control module is used to cut off the connection between the main power amplifier module and the main power amplifier modules with lower priority when any main power amplifier module fails, and connect the broadcast speaker of the main power amplifier module to the backup power amplifier module through the main power amplifier module with higher priority.

[0022] Furthermore, the control module includes: a control unit;

[0023] The control unit is configured to, when one or more main power amplifier modules fail and the power supply and the single-chip main control of each main power amplifier module are not failed, use the main power amplifier module with the highest priority among the failed main power amplifier modules as the second main power amplifier module, control the first relay and the second relay of the second main power amplifier module to close, so as to disconnect the backup input interface and the backup output interface of the second main power amplifier module, and connect the broadcast speaker of the second main power amplifier module to the backup input interface through the closed first relay and the second relay;

[0024] The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or by data communication.

[0025] Furthermore, each of the main power amplifier modules has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and the connections are made in sequence through the backup input interface and backup output interface of each main power amplifier module in order of priority from high to low.

[0026] Accordingly, the present invention also provides a computer-readable storage medium, which includes a stored computer program; wherein, when the computer program is running, it controls the device where the computer-readable storage medium is located to execute a public broadcast power amplifier master-slave switching method as described in the content of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of an embodiment of a method for switching a public broadcast power amplifier from a master to a standby mode provided by the present invention;

[0028] Figure 2 This is a structural diagram of an embodiment of a public broadcast power amplifier master-slave switching device provided by the present invention;

[0029] Figure 3 It is a structural diagram of another embodiment of the public broadcast power amplifier master-slave switching device provided by the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Example 1

[0032] Please refer to Figure 1 , a method for switching between a master and a standby power amplifier for a public broadcast power amplifier is provided in an embodiment of the present invention and is applied to a control module of a master and standby power amplifier switching device for a public broadcast power amplifier. The master and standby power amplifier switching device for a public broadcast power amplifier includes: a plurality of master power amplifier modules and a standby power amplifier module; the standby power amplifier module is connected to a first master power amplifier module with the highest priority, and the first master power amplifier module is connected to the remaining master power amplifier modules in descending order of priority;

[0033] The method comprises step S101:

[0034] When any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier module with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority.

[0035] Furthermore, the standby power amplifier module is connected to the first main power amplifier module with the highest priority, and the first main power amplifier module is connected to the remaining main power amplifier modules in descending order of priority, specifically:

[0036] Each main power amplifier module has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and is connected in sequence through the backup input interface and backup output interface of each main power amplifier module in order from high to low priority.

[0037] Furthermore, before any one of the main power amplifier modules fails, the following steps are specifically performed:

[0038] The backup input interface and the backup output interface of each main power amplifier module are connected through a turned-on first relay, and the broadcast speakers of each main power amplifier module are connected to the output port of the respective main power amplifier module through a turned-on second relay.

[0039] In this embodiment, when each main power amplifier module is operating normally, the backup output interface of the previous main power amplifier module is connected to the backup input interface of the next main power amplifier module, thereby connecting all main power amplifier modules together. The backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the last main power amplifier module is disconnected. Therefore, when each main power amplifier module is operating normally, the backup power amplifier module is not connected to any main power amplifier module, and all main power amplifier modules are eligible for master-slave switching.

[0040] Furthermore, when any one of the main power amplifier modules fails, the connection between the main power amplifier module and the main power amplifier modules with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority, which specifically includes:

[0041] When one or more main power amplifier modules fail and the power supply and single-chip main control of each main power amplifier module are not faulty, the main power amplifier module with the highest priority among the failed main power amplifier modules will be used as the second main power amplifier module, and the first relay and the second relay of the controlled second main power amplifier module will be closed to disconnect the connection between the backup input interface and the backup output interface of the second main power amplifier module, and the broadcast speaker of the second main power amplifier module will be connected to the backup input interface through the closed first relay and the second relay.

[0042] Furthermore, controlling the first relay and the second relay of the main power amplifier module to be closed is specifically as follows:

[0043] The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or data communication.

[0044] Furthermore, when any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier module with a lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with a higher priority, specifically including:

[0045] When the third main power amplifier module fails and the power supply of the third main power amplifier module is damaged, the third main power amplifier module is any one of the main power amplifier modules; the first relay and the second relay of the third main power amplifier module are in a normally closed state due to power failure, so that the connection between the backup input interface and the backup output interface of the second main power amplifier module is disconnected, and the broadcast speaker of the second main power amplifier module is connected to the backup input interface through the closed first relay and the second relay.

[0046] In this embodiment, there are two situations when the main power amplifier module fails. One is that the power supply and the single-chip main control of the main power amplifier module are not faulty, and the other is that the power supply is damaged.

[0047] When the power supply and the single-chip microcomputer main control of the main power amplifier module are not faulty, in one embodiment, the single-chip microcomputer main control controls the first relay and the second relay of the main power amplifier module with the highest priority to be closed, so that the broadcast speaker of the main power amplifier module with the highest priority is connected to the backup power amplifier module through the main power amplifier module with higher priority.

[0048] In another embodiment, the first relay and the second relay of each faulty main power amplifier module can also be controlled to close by the single-chip master control, but since the closure of the first relay disconnects the connection between the backup input interface and the backup output interface of the main power amplifier module, only the broadcast speaker of the main power amplifier module with the highest priority will be connected to the backup power amplifier module through the main power amplifier module with a higher priority.

[0049] When the power supply of the main power amplifier module is damaged, the single-chip main control cannot work. Therefore, when the single-chip main control controls the first relay and the second relay to be normally closed when the power is off, the connection between the backup input interface and the backup output interface will be automatically disconnected, and the broadcast speaker of the powered-off main power amplifier will be automatically connected to the backup input interface of the main power amplifier module. In this case, only the broadcast speaker of the main power amplifier module with the highest priority will be connected to the backup power amplifier module through the main power amplifier module with higher priority.

[0050] To better illustrate this embodiment, please refer to Figure 2 , is a structural diagram of a specific public broadcast power amplifier master-slave switching device, in which the control module is not shown. The device includes: four main power amplifiers (main power amplifiers 1-4) and one backup power amplifier; the priorities of main power amplifiers 1-4 are ranked from high to low; the backup power amplifier is connected to the main power amplifier 1 with the highest priority, and main power amplifier 1 is connected to main power amplifier 2, main power amplifier 3, and main power amplifier 4 in sequence. Under normal operating conditions, the backup input interface and backup output interface of each main power amplifier module are connected through a connected first relay, and the broadcast speakers of each main power amplifier module are connected to the output port of the respective main power amplifier module through a connected second relay. The first relay is the master-slave switching adjacent priority relay, and the second relay is the master-slave switching relay. The first relay in main power amplifier 1 is the master-slave switching adjacent priority relay S1-1, the first relay in main power amplifier 2 is the master-slave switching adjacent priority relay S1-2, and so on.

[0051] The diagram shows a situation where the first and second relays of all main power amplifiers are closed. The closed second relay disconnects the broadcast speaker from the corresponding power amplifier module output and connects it to the corresponding power amplifier module's backup input interface through the closed first relay. The power amplifier module output includes the power amplifier module output P and the power amplifier module output N. When the first relays S1-1 and second relays S1-2 of all main power amplifiers are closed, only the broadcast speaker of the highest-priority main power amplifier 1 is connected to the backup power amplifier through the closed first and second relays.

[0052] The implementation of the present invention has the following effects:

[0053] The present invention eliminates the need for an external master-slave switch. Instead, it utilizes the device types of a single backup amplifier and multiple main amplifiers to sequentially connect the amplifiers in order of priority. In the event of a main amplifier failure, the single-chip microcomputer (MCU) master control disconnects the low-priority main amplifier module. The disconnected main amplifier and its lower-priority counterparts lose their master-slave switching eligibility. All high-priority main amplifiers with backup inputs to the faulty amplifier remain eligible for master-slave switching, ensuring that high-priority main amplifiers can switch between master and backup before lower-priority ones. Furthermore, the present invention considers that a power failure could render the MCU master control inoperable. Therefore, when the MCU master control controls the first and second relays in a normally closed state, the connection between the backup input interface and the backup output interface is automatically disconnected, automatically connecting the broadcast speaker of the powered-off main amplifier to the backup input interface of the main amplifier module. By utilizing the relay states and the connection method for multiple main amplifiers, the present invention ensures that, even in the event of multiple powered-off main amplifiers, high-priority main amplifiers can switch between master and backup before lower-priority ones, thereby improving the efficiency of amplifier master-slave switching.

[0054] Example 2

[0055] Please refer to Figure 3 , a public broadcast power amplifier master / slave switching device provided in an embodiment of the present invention, comprising: a control module, a plurality of master power amplifier modules (master power amplifier module 1 to master power amplifier module N), and a backup power amplifier module; the backup power amplifier module is connected to a first master power amplifier module with the highest priority, and the first master power amplifier module is connected to the remaining master power amplifier modules in descending order of priority;

[0056] The control module is used to cut off the connection between the main power amplifier module and the main power amplifier modules with lower priority when any main power amplifier module fails, and connect the broadcast speaker of the main power amplifier module to the backup power amplifier module through the main power amplifier module with higher priority.

[0057] Furthermore, the control module includes: a control unit;

[0058] The control unit is configured to, when one or more main power amplifier modules fail and the power supply and the single-chip main control of each main power amplifier module are not failed, use the main power amplifier module with the highest priority among the failed main power amplifier modules as the second main power amplifier module, control the first relay and the second relay of the second main power amplifier module to close, so as to disconnect the backup input interface and the backup output interface of the second main power amplifier module, and connect the broadcast speaker of the second main power amplifier module to the backup input interface through the closed first relay and the second relay;

[0059] The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or by data communication.

[0060] Furthermore, each of the main power amplifier modules has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and the connections are made in sequence through the backup input interface and backup output interface of each main power amplifier module in order of priority from high to low.

[0061] The above-mentioned public broadcast power amplifier master-slave switching device can implement the public broadcast power amplifier master-slave switching method of the above-mentioned method embodiment. The optional options in the above-mentioned method embodiment also apply to this embodiment and will not be described in detail here. The remaining contents of the embodiment of this application can refer to the contents of the above-mentioned method embodiment and will not be repeated in this embodiment.

[0062] Example 3

[0063] Accordingly, the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the public broadcast power amplifier master-slave switching method described in any one of the above embodiments.

[0064] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0065] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0066] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0067] The memory can be used to store the computer programs and / or modules. The processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile terminal, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0068] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0069] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for switching between a master and a standby public broadcast amplifier, characterized in that: A control module applied to a public broadcast power amplifier master-slave switching device, the public broadcast power amplifier master-slave switching device further comprising: a plurality of master power amplifier modules and a backup power amplifier module; the backup power amplifier module is connected to a first master power amplifier module with the highest priority, and the first master power amplifier module is connected to the remaining master power amplifier modules in descending order of priority; The method comprises: When any main power amplifier module fails, the connection between the main power amplifier module and the main power amplifier modules with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority; The backup power amplifier module is connected to the first main power amplifier module with the highest priority, and the first main power amplifier module is connected to the remaining main power amplifier modules in descending order of priority, specifically: Each main power amplifier module has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and is connected in sequence through the backup input interface and backup output interface of each main power amplifier module in order from high to low priority.

2. A method for switching between a master and a standby public broadcast amplifier according to claim 1, characterized in that: Before any of the main power amplifier modules fails, specifically: The backup input interface and the backup output interface of each main power amplifier module are connected through a turned-on first relay, and the broadcast speakers of each main power amplifier module are connected to the output port of the respective main power amplifier module through a turned-on second relay.

3. A method for switching between a master and a standby public broadcast amplifier according to claim 2, characterized in that: When any one of the main power amplifier modules fails, the connection between the main power amplifier module and the main power amplifier modules with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority, specifically including: When one or more main power amplifier modules fail and the power supply and single-chip main control of each main power amplifier module are not faulty, the main power amplifier module with the highest priority among the failed main power amplifier modules will be used as the second main power amplifier module, and the first relay and the second relay of the controlled second main power amplifier module will be closed to disconnect the connection between the backup input interface and the backup output interface of the second main power amplifier module, and the broadcast speaker of the second main power amplifier module will be connected to the backup input interface through the closed first relay and the second relay.

4. A method for switching between a master and a standby public broadcast amplifier according to claim 3, characterized in that: The controlling of the first relay and the second relay of the main power amplifier module to close is specifically: The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or data communication.

5. A method for switching between a master and a standby public broadcast amplifier according to claim 3, characterized in that: When any one of the main power amplifier modules fails, the connection between the main power amplifier module and the main power amplifier modules with lower priority is cut off, and the broadcast speaker of the main power amplifier module is connected to the backup power amplifier module through the main power amplifier module with higher priority, specifically including: When the third main power amplifier module fails and the power supply of the third main power amplifier module is damaged, the third main power amplifier module is any one of the main power amplifier modules; the first relay and the second relay of the third main power amplifier module are in a normally closed state due to power failure, so that the connection between the backup input interface and the backup output interface of the second main power amplifier module is disconnected, and the broadcast speaker of the second main power amplifier module is connected to the backup input interface through the closed first relay and the second relay.

6. A public broadcast power amplifier master-slave switching device, characterized in that: include: A control module, several main power amplifier modules and a backup power amplifier module; the backup power amplifier module is connected to the first main power amplifier module with the highest priority, and the first main power amplifier module is connected to the remaining main power amplifier modules in descending order of priority; The control module is used to cut off the connection between the main power amplifier module and the main power amplifier modules with lower priority when any main power amplifier module fails, and connect the broadcast speaker of the main power amplifier module to the backup power amplifier module through the main power amplifier module with higher priority; Each main power amplifier module has its own backup input interface and backup output interface; the backup power amplifier module is connected to the backup input interface of the first main power amplifier module, and the backup output interface of the first main power amplifier module is connected to the backup input interface of the next main power amplifier module, and is connected in sequence through the backup input interface and backup output interface of each main power amplifier module in order from high to low priority.

7. The public address power amplifier master / slave switching device according to claim 6, characterized in that: The control module includes: a control unit; The control unit is configured to, when one or more main power amplifier modules fail and the power supply and the single-chip main control of each main power amplifier module are not failed, use the main power amplifier module with the highest priority among the failed main power amplifier modules as the second main power amplifier module, control the first relay and the second relay of the second main power amplifier module to close, so as to disconnect the backup input interface and the backup output interface of the second main power amplifier module, and connect the broadcast speaker of the second main power amplifier module to the backup input interface through the closed first relay and the second relay; The first relay and the second relay of the second main power amplifier module are closed by sending a trigger signal through the single chip main control or by data communication.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program; wherein, when the computer program is run, it controls the device where the computer-readable storage medium is located to execute a method for switching the main and standby public broadcast power amplifiers according to any one of claims 1 to 5.

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