Main and standby switching circuit of modulation amplification unit of medium-wave transmitter and medium-wave transmitter

Abstract

The utility model provides a main-standby switching circuit of a modulation amplification unit of a medium-wave transmitter and the medium-wave transmitter, and relates to the field of communication. In the main and standby switching circuit, a first modulation amplification unit and a second modulation amplification unit are arranged on a mother board and are connected with a digital modulator, and an output network unit is connected with one of the first modulation amplification unit and the second modulation amplification unit and is in consistent connection with a power supply module. The controller is connected with the power supply module, the first modulation amplification unit and the second modulation amplification unit. The first modulation amplification unit and the second modulation amplification unit are both used for receiving modulation signals and excitation signals provided by the digital modulator and generating amplification signals. The output network unit is used for outputting the amplified signal to an antenna; the controller is used for receiving fault information of the first modulation and amplification unit and switching the first modulation and amplification unit and the second modulation and amplification unit, so that the situation that signals cannot be continuously transmitted when faults occur is avoided.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter and a medium wave transmitter. Background Art

[0002] A medium wave transmitter is a device used by radio stations to transmit medium wave frequency signals. In a low-power medium wave transmitter, a modulation and amplification unit is set on the motherboard to amplify the signal before output. In related technologies, once a problem occurs in the modulation and amplification unit, the transmitter will stop working and the modulation and amplification unit must be replaced. It can only be started normally after qualified debugging, which affects the continuous broadcast of the station signal. Utility Model Content

[0003] The present application provides a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter and a medium wave transmitter, which avoids the failure of continuous signal transmission when a fault occurs by performing device switching.

[0004] In a first aspect, an embodiment of the present application provides a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter, the circuit comprising:

[0005] A digital modulator, used for providing a modulation signal and an excitation signal;

[0006] A motherboard, wherein a first modulation amplification unit and a second modulation amplification unit are provided on the motherboard, wherein the first modulation amplification unit and the second modulation amplification unit are both connected to the digital modulator, and the first modulation amplification unit and the second modulation amplification unit are both used to receive the modulation signal and the excitation signal and generate an amplified signal;

[0007] a power supply module, used to supply power to one of the first modulation and amplification unit and the second modulation and amplification unit;

[0008] an output network unit, connected to one of the first modulation and amplification unit and the second modulation and amplification unit, and connected consistently with the power supply module, and configured to output the amplified signal to an antenna;

[0009] The controller is connected to the first modulation and amplification unit and the second modulation and amplification unit respectively, and is used to receive fault information of the first modulation and amplification unit and the second modulation and amplification unit, and switch the first modulation and amplification unit and the second modulation and amplification unit.

[0010] In the above technical solution, the main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter includes a digital modulator, a motherboard, a power supply module, an output network unit and a controller. The motherboard is provided with a first modulation and amplification unit and a second modulation and amplification unit, and the first modulation and amplification unit and the second modulation and amplification unit are both connected to the digital modulator. The controller is respectively connected to the power supply module, the first modulation and amplification unit and the second modulation and amplification unit; the power supply module is used to power one of the first modulation and amplification unit and the second modulation and amplification unit to ensure that one of the first modulation and amplification unit and the second modulation and amplification unit works normally, and the other is used for standby; the digital modulator is used to provide a modulation signal and an excitation signal to perform signal modulation, and the first modulation and amplification unit and the first modulation and amplification unit are connected to the digital modulator. The two modulation and amplification units are used to receive modulation signals and excitation signals and generate amplified signals, so that the first modulation and amplification unit and the second modulation and amplification unit can perform signal modulation normally and realize signal amplification; the output network unit is connected to one of the first modulation and amplification unit and the second modulation and amplification unit, and is connected consistently with the power supply module, to ensure that one of the first modulation and amplification unit and the second modulation and amplification unit serves as a backup amplification unit and is used to output the amplified signal to the antenna; the controller is used to receive fault information of the first modulation and amplification unit and the second modulation and amplification unit, and to switch the first modulation and amplification unit and the second modulation and amplification unit. By switching the equipment, the switching time is short, which can avoid the inability to continuously transmit signals when a fault occurs.

[0011] In some embodiments of the present application, the first modulation and amplification unit includes a first preamplifier, a first modulation driver and a first power amplifier, the first preamplifier is respectively connected to the digital modulator and the first power amplifier for receiving the excitation signal, the first modulation driver is respectively connected to the digital modulator and the first power amplifier for receiving the modulation signal, and the first power amplifier is connected to the output network unit for generating the amplified signal.

[0012] In the above technical solution, the first modulation and amplification unit is used to receive the excitation signal and the modulation signal, and perform radio frequency amplification, which is beneficial to the propagation of the signal.

[0013] In some embodiments of the present application, the second modulation amplification unit includes a second preamplifier, a second modulation driver and a second power amplifier, the second preamplifier is respectively connected to the digital modulator and the second power amplifier for receiving the excitation signal, the second modulation driver is respectively connected to the digital modulator and the second power amplifier for receiving the modulation signal, and the second power amplifier is connected to the output network unit for generating the amplified signal.

[0014] In the above technical solution, the second modulation and amplification unit is used to receive the excitation signal and the modulation signal and perform radio frequency amplification, which is beneficial to signal propagation and provides the same function as the first modulation and amplification unit, ensuring that signal transmission is not affected after switching.

[0015] In some embodiments of the present application, the controller includes a signal receiving module, a lock module and a switching module, the signal receiving module is respectively connected to the lock module, the first modulation and amplification unit and the second modulation and amplification unit, the lock module is connected to the first modulation and amplification unit and one of the second modulation and amplification unit through a switching device, the lock module is also connected to the switching module, the signal receiving module is used to receive a first fault signal of the first modulation and amplification unit, the lock module is used to generate a blocking signal according to the first fault signal, and the switching module is used to control the power supply module to cut off power according to the blocking signal, and after switching the first modulation and amplification unit to the second modulation and amplification unit, control the power supply module to supply power.

[0016] In the above technical solution, blocking is performed by the controller to ensure the accuracy of signal transmission, and when a fault occurs, the first modulation and amplification unit is switched to the second modulation and amplification unit in a timely manner to ensure normal transmission of the signal.

[0017] In some embodiments of the present application, the power supply module includes a first front power supply module, a second front power supply module and a driving power supply module, the first front power supply module is respectively connected to one of the first preamplifier and the second preamplifier, the second front power supply module is respectively connected to one of the first preamplifier and the second preamplifier, and is connected consistently with the first front power supply module, and the driving power supply module is respectively connected to one of the first modulation driver and the second modulation driver, and is connected consistently with the first front power supply module.

[0018] In the above technical solution, the first front power supply module, the second front power supply module and the driving power supply module in the power supply module respectively power the modules in the modulation and amplification unit, and the connection method is consistent, so that one of the main and standby modulation and amplification units works to ensure continuous signal transmission.

[0019] In some embodiments of the present application, the driving power supply module is used to provide a -230V voltage.

[0020] In some embodiments of the present application, the first front power supply module is used to provide a 24V voltage.

[0021] In some embodiments of the present application, the second front power supply module is used to provide a -115V voltage.

[0022] In some embodiments of the present application, the output network unit is connected to one of the first modulation and amplification unit and the second modulation and amplification unit respectively by using a switch device.

[0023] In the above technical solution, the switch device is connected, and when it is closed or not, the first modulation and amplification unit and the second modulation and amplification unit are correspondingly connected, so that one of the connections can be achieved and easy switching can be ensured.

[0024] In a second aspect, an embodiment of the present application provides a medium wave transmitter, comprising a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter as described in any one of the first aspects.

[0025] In summary, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0026] 1. Since the power supply module and the output network unit are set to selectively connect the first modulation and amplification unit and the second modulation and amplification unit, and one of the modulation and amplification units is set as a standby, in the event of a failure, the first modulation and amplification unit and the second modulation and amplification unit are controlled to switch to continue normal operation. Therefore, the problem in the related technology that once a problem occurs in the modulation and amplification unit, the transmitter will stop working and the modulation and amplification unit must be replaced and can only be started normally after qualified debugging, affecting the continuous broadcasting of the station signal. By setting a standby modulation and amplification unit, equipment switching is performed in the event of a failure to avoid the inability to continuously transmit signals in the event of a failure.

[0027] 2. The digital modulator keeps working. When the first modulation and amplification unit and the second modulation and amplification unit are switched, the signal is not interrupted, and the signal switching period does not affect the continuous transmission of the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a module schematic diagram of a master-slave switching circuit of a medium wave transmitter modulation and amplification unit provided by an embodiment of the present application;

[0029] Figure 2 It is a circuit diagram of a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter provided by an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable technicians in this field to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0031] In the description of the embodiments of the present application, words such as "for example" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "for example" or "for example" is intended to present related concepts in a specific way.

[0032] In the description of the embodiments of the present application, the meaning of the term "multiple" refers to two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0033] The embodiment of the present application provides a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter and a medium wave transmitter thereof. The master-slave switching circuit of the modulation and amplification unit of the medium wave transmitter includes a digital modulator, a motherboard, a power supply module, an output network unit and a controller. A first modulation and amplification unit and a second modulation and amplification unit are arranged on the motherboard. The first modulation and amplification unit and the second modulation and amplification unit are both connected to the digital modulator. The controller is respectively connected to the power supply module, the first modulation and amplification unit and the second modulation and amplification unit; the power supply module is used to supply power to one of the first modulation and amplification unit and the second modulation and amplification unit to ensure that one of the first modulation and amplification unit and the second modulation and amplification unit works normally, and the other is used for standby; the digital modulator is used to provide a modulation signal and an excitation signal to perform signal Signal modulation, the first modulation and amplification unit and the second modulation and amplification unit are both used to receive the modulation signal and the excitation signal and generate an amplified signal, so that the first modulation and amplification unit and the second modulation and amplification unit can perform signal modulation normally and realize signal amplification; the output network unit is connected to one of the first modulation and amplification unit and the second modulation and amplification unit, and is connected consistently with the power supply module, to ensure that one of the first modulation and amplification unit and the second modulation and amplification unit serves as a backup amplification unit and is used to output the amplified signal to the antenna; the controller is used to receive fault information of the first modulation and amplification unit and the second modulation and amplification unit, and to switch the first modulation and amplification unit and the second modulation and amplification unit. By switching the equipment, the switching time is short, which can avoid the inability to continuously transmit signals when a fault occurs.

[0034] It should be noted that the medium wave transmitter is a low-power medium wave transmitter, which can be used in equipment for transmitting medium wave frequency signals in radio stations to send sound, music and other information, or for broadcasting, and can transmit signals continuously.

[0035] The technical solution provided in the embodiments of the present application is further described below in conjunction with the accompanying drawings.

[0036] Reference Figure 1 , Figure 1 It is a module schematic diagram of the master-slave switching circuit of the medium wave transmitter modulation and amplification unit provided in an embodiment of the present application. The master-slave switching circuit of the medium wave transmitter modulation and amplification unit includes a digital modulator 102, a motherboard, a power supply module 101, an output network unit 105 and a controller 106. The motherboard is provided with a first modulation and amplification unit 103 and a second modulation and amplification unit 104. The digital modulator 102 is used to provide a modulation signal and an excitation signal for signal modulation; the first modulation and amplification unit 103 and the second modulation and amplification unit 104 are both connected to the digital modulator 102, and are both used to receive the modulation signal and the excitation signal and generate an amplified signal; the power supply module 101 is used to power one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 to ensure that one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 works normally, and the other one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 works normally. The output network unit 105 is connected to one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104, and is connected to the power supply module 101 in the same manner, ensuring that one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 is used as a backup amplification unit, and is used to output the amplified signal to the antenna; the controller 106 is connected to the power supply module 101, the first modulation and amplification unit 103 and the second modulation and amplification unit 104 respectively, and is used to receive the fault information of the first modulation and amplification unit 103 and the second modulation and amplification unit 104, and switch the first modulation and amplification unit 103 and the second modulation and amplification unit 104. By switching the equipment, the switching time is short, which can avoid the inability to continuously transmit signals when a fault occurs. Among them, the digital modulator 102 is a PWM digital modulator 102.

[0037] In one embodiment, the controller 106 includes a signal receiving module, a lock module and a switching module. The signal receiving module is connected to the lock module, the first modulation and amplification unit 103 and the second modulation and amplification unit 104 respectively. The lock module is connected to one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 through a switch device. The lock module is also connected to the switching module. The signal receiving module is used to receive the first fault signal of the first modulation and amplification unit 103. The lock module is used to generate a blocking signal according to the first fault signal to perform radio frequency blocking of the modulation signal to avoid signal transmission failure. The switching module is used to control the power supply module 101 to cut off the power according to the blocking signal, interrupt the signal transmission, so as to switch the modulation and amplification unit to ensure safety. After the first modulation and amplification unit 103 is switched to the second modulation and amplification unit 104, the power supply module 101 is controlled to supply power and continue signal transmission. Since the power-off time is short, it hardly affects the normal transmission of the signal.

[0038] In another embodiment, when a failure occurs in the first modulation and amplification unit 103, after switching the first modulation and amplification unit 103 with the second modulation and amplification unit 104, the first modulation and amplification unit 103 can be disassembled and repaired, and after debugging, the working second modulation and amplification unit 104 can be switched back to the first modulation and amplification unit 103 without affecting the continuous transmission of the signal.

[0039] In one embodiment, the output network unit 105 is connected to one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 using a switch device. The switch device is a device for selective connection, and the first modulation and amplification unit 103 and the second modulation and amplification unit 104 can be switched by the switch device.

[0040] Exemplarily, the first modulation and amplification unit 103 is used as the main modulation and amplification unit, and the second modulation and amplification unit 104 is used as the backup modulation and amplification unit. When working, the main modulation and amplification unit is preferentially selected to work, the digital modulator 102 is connected to the first modulation and amplification unit 103, the power supply module 101 is used to power the first modulation and amplification unit 103, and the output network unit 105 is connected to the first modulation and amplification unit 103. When a fault occurs in the first modulation and amplification unit 103, the fault information received by the controller 106 is the fault information of the first modulation and amplification unit 103, and the controller 106 switches the first modulation and amplification unit 103 to the second modulation and amplification unit 104 to work, thereby avoiding stopping work and ensuring continuous signal transmission.

[0041] It should be noted that the second modulation and amplification unit 104 can also be used as the main modulation and amplification unit, and the first modulation and amplification unit 103 can be used as the backup modulation and amplification unit. The switching method in the event of a fault is similar to the above-mentioned switching method of using the first modulation and amplification unit 103 as the main modulation and amplification unit and the second modulation and amplification unit 104 as the backup modulation and amplification unit, and will not be repeated here.

[0042] In one embodiment, the first modulation and amplification unit 103 includes a first preamplifier, a first modulation driver and a first power amplifier. The first preamplifier is connected to the digital modulator 102 and the first power amplifier respectively, and is used to receive an excitation signal, and the excitation signal causes the first preamplifier to generate a continuous signal (such as an audio signal). The first modulation driver is connected to the digital modulator 102 and the first power amplifier respectively, and is used to receive a modulation signal, and the modulation signal causes the first modulation driver to transmit according to a signal of a certain waveform. The first power amplifier is connected to the output network unit 105, and is used to generate an amplified signal, and the signal is amplified by the power amplifier, which is conducive to the propagation of subsequent signals, and is transmitted to the antenna through the output network unit 105 to transmit the signal.

[0043] In one embodiment, the second modulation and amplification unit 104 includes a second preamplifier, a second modulation driver and a second power amplifier. The second preamplifier is connected to the digital modulator 102 and the second power amplifier respectively, and is used to receive an excitation signal. The excitation signal causes the second preamplifier to generate a continuous signal (such as an audio signal). The second modulation driver is connected to the digital modulator 102 and the second power amplifier respectively, and is used to receive a modulation signal. The modulation signal causes the first modulation driver to transmit according to a signal of a certain waveform. The second power amplifier is connected to the output network unit 105, and is used to generate an amplified signal. The signal is amplified by the power amplifier, which is conducive to the propagation of subsequent signals, and is transmitted to the antenna through the output network unit 105 for signal transmission. Among them, the second modulation and amplification unit 104 has the same structure as the first modulation and amplification unit 103, and both can realize signal amplification. When the first modulation and amplification unit 103 is converted into the second modulation and amplification unit 104, the signal transmission quality is not affected.

[0044] In one embodiment, the power supply module 101 includes a first front power supply module 101, a second front power supply module 101 and a driving power supply module 101, the first front power supply module 101 is respectively connected to one of the first preamplifier and the second preamplifier, the second front power supply module 101 is respectively connected to one of the first preamplifier and the second preamplifier, and is connected consistently with the first front power supply module 101, and the driving power supply module 101 is respectively connected to one of the first modulation driver and the second modulation driver, and is connected consistently with the first front power supply module 101. It can ensure that the power supply module 101 provides consistent power to the modules in the modulation and amplification unit, so that a spare modulation and amplification unit is added and the normal mode of operation is maintained. Among them, the driving power supply module 101 is used to provide a -230V voltage; the first front power supply module 101 is used to provide a 24V voltage; the second front power supply module 101 is used to provide a -115V voltage.

[0045] refer to Figure 2 , Figure 2 The circuit diagram of the main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter provided by an embodiment of the present application is shown. The conditions are set as follows: the digital modulator 102 is a PWM digital modulator 102, the driving power supply module 101 is used to provide a -230V voltage; the first front power supply module 101 is used to provide a 24V voltage; the second front power supply module 101 is used to provide a -115V voltage. The driving power supply module 101 is connected to the second modulation and amplification unit 104 and the first modulation and amplification unit 103 respectively through the switch device K1, the first power supply module 101 is connected to the second modulation and amplification unit 104 and the first modulation and amplification unit 103 respectively through the switch device K3A, the second power supply module 101 is connected to the second modulation and amplification unit 104 and the first modulation and amplification unit 103 respectively through the switch device K3B, the second modulation and amplification unit 104 and the first modulation and amplification unit 103 are connected to the output network unit 105 through the switch device K6, and the controller 106 selects the second modulation and amplification unit 104 and the first modulation and amplification unit 103 through the switch device K2. The first modulation and amplification unit 103 is used as a main modulation and amplification unit, and the second modulation and amplification unit 104 is used as a standby modulation and amplification unit.

[0046] When the low-power medium-wave transmitter is working, the PDM digital modulator 102 generates an excitation signal and a modulation signal. The excitation signal is directly sent to the first preamplifier and the second preamplifier; the modulation signal is directly connected to the first modulation driver and the second modulation driver. The switch devices K1, K2, K3, and K6 are not energized, the first preamplifier is powered, and the second preamplifier is not powered. Although there is an excitation signal input, it does not work because there is no power supply. The first modulation driver has a -230V input, and the second modulation driver does not have this power supply. Although there is a modulation signal input, it does not work because there is no power supply. The locking signal is connected to the locking output after the first modulation amplifier unit 103 is powered. The first power amplifier receives the signals of the first preamplifier and the first modulation driver. Under the condition of normal locking and no fault in the first modulation amplifier unit 103, the controller 106 controls the release of the radio frequency blocking signal, and the amplified signal can be output normally, and is input to the output network unit 105 through the K6 normally closed contact, and is sent to the antenna after impedance matching and filtering of the output network unit 105.

[0047] When the first modulation and amplification unit 103 fails, the controller 106 first performs RF blocking to stop the first modulation and amplification unit 103 from working, and the signal is grounded at the front end and has no output. Then a control instruction for the master-slave switching is issued to switch the power supply to the second modulation and amplification unit 104, so that the main working mode is changed to the standby working mode. Timely switching after the failure ensures normal broadcasting. Because the excitation signal and the modulation signal of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 are maintained before and after the switching, only the first modulation and amplification unit 103 and the second modulation and amplification unit 104 need to be switched, and the signal transmission interruption time is very short, which hardly affects the normal broadcasting. After the switching, the first modulation and amplification unit 103 can be removed for maintenance without affecting the normal broadcasting of the transmitter. The master-slave switching greatly improves the stability of the equipment.

[0048] In one embodiment, the embodiment of the present application provides a medium wave transmitter, which includes a master-slave switching circuit of a modulation and amplification unit of the medium wave transmitter, including a master-slave switching circuit of the modulation and amplification unit of the medium wave transmitter, including a digital modulator 102, a motherboard, a power supply module 101, an output network unit 105 and a controller 106, a first modulation and amplification unit 103 and a second modulation and amplification unit 104 are arranged on the motherboard, the first modulation and amplification unit 103 and the second modulation and amplification unit 104 are both connected to the digital modulator 102, and the controller 106 is respectively connected to the power supply module 101, the first modulation and amplification unit 103 and the second modulation and amplification unit 104; the power supply module 101 is used to power one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 to ensure that one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 works normally, and the other is used for standby; the digital modulator 102 is used to provide modulation The control signal and the excitation signal are used to perform signal modulation. The first modulation and amplification unit 103 and the second modulation and amplification unit 104 are both used to receive the modulation signal and the excitation signal and generate an amplified signal, so that the first modulation and amplification unit 103 and the second modulation and amplification unit 104 can normally perform signal modulation and realize signal amplification; the output network unit 105 is connected to one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104, and is connected consistently with the power supply module 101, to ensure that one of the first modulation and amplification unit 103 and the second modulation and amplification unit 104 is used as a standby amplification unit and is used to output the amplified signal to the antenna; the controller 106 is used to receive fault information of the first modulation and amplification unit 103 and the second modulation and amplification unit 104, and to switch the first modulation and amplification unit 103 and the second modulation and amplification unit 104. By switching the equipment, the switching time is short, which can avoid the inability to continuously transmit signals when a fault occurs.

[0049] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0050] The above are only exemplary embodiments of the present disclosure and cannot be used to limit the scope of the present disclosure. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the disclosure of the specification and the truth of practice, those skilled in the art will easily think of other embodiments of the present disclosure.

[0051] This application is intended to cover any variation, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art not described in the present disclosure. The description and examples are to be regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A master-slave switching circuit for a modulation and amplification unit of a medium wave transmitter, characterized in that: The circuit comprises: A digital modulator, used for providing a modulation signal and an excitation signal; A motherboard, wherein a first modulation amplification unit and a second modulation amplification unit are provided on the motherboard, wherein the first modulation amplification unit and the second modulation amplification unit are both connected to the digital modulator, and the first modulation amplification unit and the second modulation amplification unit are both used to receive the modulation signal and the excitation signal and generate an amplified signal; a power supply module, used to supply power to one of the first modulation and amplification unit and the second modulation and amplification unit; an output network unit, connected to one of the first modulation and amplification unit and the second modulation and amplification unit, and connected consistently with the power supply module, and configured to output the amplified signal to an antenna; The controller is respectively connected to the power supply module, the first modulation and amplification unit and the second modulation and amplification unit, and is used to receive fault information of the first modulation and amplification unit or the second modulation and amplification unit, and switch the first modulation and amplification unit and the second modulation and amplification unit.

2. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 1, characterized in that: The first modulation and amplification unit includes a first preamplifier, a first modulation driver and a first power amplifier. The first preamplifier is respectively connected to the digital modulator and the first power amplifier for receiving the excitation signal. The first modulation driver is respectively connected to the digital modulator and the first power amplifier for receiving the modulation signal. The first power amplifier is connected to the output network unit for generating the amplified signal.

3. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 2, characterized in that: The second modulation amplification unit includes a second preamplifier, a second modulation driver and a second power amplifier. The second preamplifier is respectively connected to the digital modulator and the second power amplifier for receiving the excitation signal. The second modulation driver is respectively connected to the digital modulator and the second power amplifier for receiving the modulation signal. The second power amplifier is connected to the output network unit for generating the amplified signal.

4. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 1, characterized in that: The controller includes a signal receiving module, a lock module and a switching module. The signal receiving module is respectively connected to the lock module, the first modulation and amplification unit and the second modulation and amplification unit. The lock module is connected to one of the first modulation and amplification unit and the second modulation and amplification unit through a switch device. The lock module is also connected to the switching module. The signal receiving module is used to receive a first fault signal of the first modulation and amplification unit. The lock module is used to generate a blocking signal according to the first fault signal. The switching module is used to control the power supply module to cut off power according to the blocking signal, and after switching the first modulation and amplification unit to the second modulation and amplification unit, control the power supply module to supply power.

5. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 3, characterized in that: The power supply module includes a first front power supply module, a second front power supply module and a driving power supply module. The first front power supply module is respectively connected to one of the first preamplifier and the second preamplifier, the second front power supply module is respectively connected to one of the first preamplifier and the second preamplifier, and is connected consistently with the first front power supply module, and the driving power supply module is respectively connected to one of the first modulation driver and the second modulation driver, and is connected consistently with the first front power supply module.

6. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 5, characterized in that: The driving power supply module is used to provide a -230V voltage.

7. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 5, characterized in that: The first front power supply module is used to provide a 24V voltage.

8. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to claim 5, characterized in that: The second front power supply module is used to provide a -115V voltage.

9. The main-standby switching circuit of the modulation and amplification unit of the medium wave transmitter according to any one of claims 1 to 8, characterized in that: The output network unit is connected to one of the first modulation and amplification unit and the second modulation and amplification unit respectively by using a switch device.

10. A medium wave transmitter, characterized in that: The invention comprises a master-slave switching circuit of a modulation and amplification unit of a medium wave transmitter as claimed in any one of claims 1 to 9.

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