All-solid-state short-wave AM20kW broadcast transmitter

Abstract

The utility model relates to the field of broadcast transmitters, and discloses an all-solid-state short-wave AM20kW broadcast transmitter, which comprises a signal source, an exciter, a pre-stage amplifier, a power divider, a plurality of power amplification systems, a synthesizer, a filter and a directional coupler, the output end of the power divider is respectively connected with the input ends of the plurality of power amplification systems, the output ends of the plurality of power amplification systems are connected to the synthesizer, the output end of the synthesizer is sequentially connected with the filter and the directional coupler, and the output end of the directional coupler is connected to a load. Excitation signals are divided into a plurality of power amplification systems in proportion through a power divider, and uniform distribution of the signals in a wide frequency range is achieved. High-power output is guaranteed, good frequency band consistency is maintained, stable transmission of broadband signals is achieved, and the application requirement of a complex short-wave communication environment is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of broadcast transmitter especially relates to full solid state short wave AM20kW broadcast transmitter. BACKGROUND

[0002] As an important transmitting device of radio signal, the broadcast transmitter is widely used in short wave communication, emergency broadcast and long distance wireless transmission scenes, and the existing broadcast transmitter usually adopts power amplification module to amplify the input radio frequency signal step by step, and realizes the power superposition of multiple radio frequency signals through signal synthesis device, finally completes the output of high power radio frequency signal, to meet the demand of long distance coverage and stable signal transmission.

[0003] However, the amplification and synthesis system of the existing broadcast transmitter usually adopts the traditional narrowband signal distribution mode, which cannot adapt to the stable transmission of wide frequency signal range, especially when facing complex frequency environment or multi-frequency point broadcast demand, the signal is prone to uneven energy and limited frequency response in the distribution process, thereby affecting the working stability of the subsequent amplification module, at the same time, in the signal synthesis stage, the overall synthesis efficiency is reduced due to the phase difference and energy loss of the signal, it is difficult to fully release the output capacity of each power amplification module, and the transmission efficiency and signal coverage quality of the broadcast transmitter are reduced. UTILITY MODEL CONTENT

[0004] In order to make up for the above shortcomings, the utility model provides full solid state short wave AM20kW broadcast transmitter, aims at improving the problem that the amplification and synthesis system of the existing broadcast transmitter usually adopts the traditional narrowband signal distribution mode, which cannot adapt to the stable transmission of wide frequency signal range.

[0005] In order to realize the above purpose, the utility model provides the following technical scheme:

[0006] Full solid state short wave AM20kW broadcast transmitter, comprising:

[0007] Signal source, exciter, preamplifier, power divider, multiple power amplification systems, synthesizer, filter and directional coupler, the signal output by the signal source is input to the power divider through the exciter and the preamplifier in turn, the output end of the power divider is connected with the input end of multiple power amplification systems respectively, the output end of multiple power amplification systems is connected to the synthesizer, the output end of the synthesizer is connected with the filter and the directional coupler in turn, and the output end of the directional coupler is connected to the load.

[0008] Through the technical scheme, the signal source output signal sequentially passes through the exciter, the pre-stage amplifier, the power distributor, the plurality of power amplification systems, the synthesizer, the filter, and the directional coupler, and is finally output to the load, the modules are electrically connected through cables, the signal flows in sequence, the structure is compact, the connection is stable, and maintenance and expansion are facilitated.

[0009] As a further description of the technical scheme:

[0010] The plurality of power amplification systems are connected in parallel in a modular manner and are respectively used for receiving the signals distributed by the power distributor.

[0011] Through the technical scheme, the plurality of power amplification systems are connected in parallel between the power distributor and the synthesizer, each power amplification system amplifies the input signal individually, and finally, the signals are converged by the synthesizer, so that the system has good expansibility and fault tolerance.

[0012] As a further description of the technical scheme:

[0013] Each power amplification system comprises a distribution module, a plurality of power amplifiers, a power synthesis module, a directional coupler, and a unit control board, the distribution module inputs the received signal to the plurality of power amplifiers, the output ends of the plurality of power amplifiers are connected to the power synthesis module, and the output end of the power synthesis module is connected to the unit control board through the directional coupler.

[0014] Through the technical scheme, each power amplification system comprises a distribution module, a power amplifier, a power synthesis module, a directional coupler, and a unit control board, the signal is distributed to the plurality of power amplifiers through the distribution module, is amplified, is synthesized and output by the power synthesis module, and is finally guided to the unit control board for monitoring and adjustment through the directional coupler, so that the stability of the output signal is ensured.

[0015] As a further description of the technical scheme:

[0016] The unit control board interacts with an external controller through a communication interface to control the power amplifier and detect the state of the power amplifier.

[0017] Through the technical scheme, the unit control board is electrically connected to the power amplifier, is responsible for detecting the running state of the power amplifier and realizing real-time adjustment, monitors signal voltage, current, temperature, and other parameters, ensures that the power amplifier works in a safe and stable range, and has a fault protection function.

[0018] As a further description of the technical scheme:

[0019] In each power amplification system, four power amplifiers are included, the distribution module is a four distributor, and the power synthesis module is a four synthesizer.

[0020] Through the above technical solution: multiple power amplification systems are connected in parallel in a modular manner, and the distribution module in each power amplification system uniformly distributes the received signal to four power amplifiers, and the four distributors ensure the consistency and stability of signal distribution, thereby improving the efficiency and reliability of signal processing. Four power amplifiers amplify the distributed signals respectively, and then recombine the amplified signals through a four combiner, and the power combining module ensures the integrity of the combined signal and the power superposition effect, effectively improving the overall output power. In addition, the unit control board can interact with the external controller through the communication interface to realize precise control and state detection of the power amplifier, further enhancing the controllability and stability of the system.

[0021] As a further description of the above technical solution:

[0022] Two power amplification systems are included.

[0023] Through the above technical solution: the reliability and redundancy of the system can be significantly improved, thereby ensuring the stable output of the broadcast transmitter. At the same time, this design also helps to reduce the maintenance cost of the system and improve the overall efficiency.

[0024] As a further description of the above technical solution:

[0025] It also includes a controller power distribution unit and a switching power supply, the controller is used to control the working state of the signal source, exciter and multiple power amplification systems, the power distribution unit distributes 380V AC power to each device, and the switching power supply provides 48V DC power for each power amplification system.

[0026] Through the above technical solution: the controller is connected with the signal source, exciter, power amplification system and switching power supply through signal and power interface, realizing the operation control and parameter setting of each module, ensuring the stable and safe operation of the whole system. The power distribution unit distributes 380V AC power to switching power supply, exciter, power divider, combiner and filter, etc. The input voltage of the switching power supply is 380V AC, and the output voltage is 48V DC. The centralized power supply design is adopted, and the 48V DC power is stably supplied to each power amplification system through the distributed power distribution module.

[0027] As a further description of the above technical solution:

[0028] The controller is connected with the upper computer monitoring system, and the upper computer monitoring system is used for monitoring and managing the system running state.

[0029] Through the technical scheme, the host computer monitoring system is connected with the controller through a bus, can collect equipment operation parameters in real time, and supports data display, fault alarm and historical record, so that the user can conveniently centrally monitor and maintain the system state.

[0030] The utility model has the advantages of the following:

[0031] 1、 the utility model discloses, through power divider, excitation signal is divided to multiple power amplifier system according to proportion, realized the uniform distribution of signal in wide frequency range, simultaneously, synthesizer will multiple power amplifier system output signal lossless merge, significantly reduced signal in the loss of synthesis process, guarantee the high -power output while, maintain good band consistency, realize the stable transmission of wideband signal, satisfy the application demand of complex short wave communication environment.

[0032] 2、 the utility model discloses, adopt the high -power power amplifier of short wave special use, possess the characteristics of high efficiency, low heat consumption, can in small volume stable output high power signal, greatly promoted the power density of complete machine, simultaneously, multiple short wave power amplifier adopts parallel structure, possess redundancy protection and quick replacement function, ensure that the system can still maintain basic output when module level fault, enhance system reliability and stability. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The overall architecture diagram of the all-solid-state short wave AM 20kW broadcast transmitter is provided. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the utility model will be clearly and completely described with reference to the accompanying drawings of the specification of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0035] REFERENCE Figure 1The utility model provides an embodiment: full solid short wave AM20kW broadcast transmitter, include: signal source, exciter, forestage amplifier, power divider, multiple power amplifier system, synthesizer, filter and directional coupler, and the excitation source of exciter contains high stability crystal oscillator, preamplifier drive module, last stage module, coupler and control panel. High stability crystal oscillator realizes with quartz crystal oscillator, has high accuracy and low drift characteristic, can output stable radio frequency signal. Preamplifier drive module is composed of two PHA-202, is used to preliminary amplify radio frequency signal. Last stage module adopts BLF189XR and realizes about 53dB's amplification of gain, provides about 200W peak value's linear power for last stage amplifier unit. Coupler completes the incidence and reflection power detection of radio frequency output, adopts coaxial structure, has high isolation and low insertion loss. Control panel adopts high performance MCU control, carries out collection, analysis, processing and protection to the temperature of preamplifier radiator, the output and reflection power of amplifier and power amplifier operating current, voltage and other data, provides RS485 interface to the outside, and the exciter passes through the radio frequency signal of adjustable modulation of about 20dBm's output power of amplification filtering, and is input to preamplifier. Filter is used to filter out the stray signal of band, realizes with cavity filter or ceramic filter, has high selectivity and low insertion loss. The signal output by signal source is input to power divider in turn through exciter and forestage amplifier, and the output end of power divider is connected with the input end of multiple radio frequency system power amplifier system respectively, and the output end of multiple power amplifier system is connected to synthesizer, and the output end of synthesizer is connected to filter and directional coupler in turn, and the output end of directional coupler is connected to load.

[0036] Specifically, the original signal output by the signal source first enters the exciter for signal amplitude preprocessing, to ensure that the signal quality meets the input requirements of the later stage, and the signal output by the exciter is amplified to an appropriate signal amplitude by the forestage amplifier and then input to the power divider. The power divider is designed in a multi-output form, which distributes the input signal to multiple power amplifier systems according to a certain proportion. Each power amplifier system receives the distributed signal and independently completes amplification processing. Then, the multiple amplified signals are converged and phase-adjusted by the synthesizer. Finally, the filter suppresses the out-of-band interference signals to ensure the spectral purity of the output signal. The filtered signal enters the directional coupler for power directionality control to prevent reverse signals from damaging the front-end module. Finally, the signal is output to the load, realizing efficient and safe signal amplification and synthesis functions.

[0037] Specifically, the plurality of power amplification systems adopts a completely independent modular design, each power amplification system is provided with an independent input interface and an output interface, facilitating flexible expansion of the system by increasing or decreasing the power amplification system modules under different power requirements. In specific implementation, the input ends of the plurality of power amplification systems are connected with the multiple output ends of the power distributor through a connecting line, the plurality of power amplification systems are connected in parallel, and together form a main channel for signal amplification. The parallel structure design makes the entire system have good redundancy characteristics, when one of the power amplification systems fails, the other power amplification systems can still work, improving stability and reliability. At the same time, through the modular structure, the number of power amplification systems can be flexibly adjusted according to the output power requirement, meeting the signal amplification requirement in different application scenarios.

[0038] Referring to Figure 1 In this embodiment of the present application, two power amplification systems are included, and the two sets of power amplification systems are connected in parallel in a modular manner and are respectively used for receiving signals distributed by the power distributor. The power distributor is a 2 distributor, and the synthesizer is a 2 synthesizer.

[0039] Referring to Figure 1 Each power amplification system includes a power amplifier 1, a power amplifier 2, a power amplifier 3, a power amplifier 4, a distribution module, a power synthesis module, a directional coupler, and a unit control board. The distribution module is a four distributor, and the power synthesis module is a four synthesizer. The four distributor inputs the received signals to the power amplifier 1, the power amplifier 2, the power amplifier 3, and the power amplifier 4. The output ends of the power amplifier 1, the power amplifier 2, the power amplifier 3, and the power amplifier 4 are connected to the four synthesizer. The output end of the four synthesizer is connected to the unit control board through the directional coupler.

[0040] Specifically, the four distributor uniformly distributes the signals from the power distributor to each power amplifier according to a set ratio, ensuring that the input signal amplitudes of each power amplifier are similar and reducing the output imbalance problem caused by input differences. The power amplifier is responsible for amplifying the received radio frequency signals step by step. Each power amplifier is provided with an input protection circuit and an output feedback loop to ensure that it can stably output the set amplification power under different load conditions. The output signals of all power amplifiers are collected through the power synthesis module. The four synthesizer uses circuit matching and phase synchronization technology to ensure the amplitude and phase consistency of the multiple signals. The synthesized signals are guided to the unit control board through the directional coupler, realizing real-time monitoring and adjustment of signal quality and improving the overall amplification efficiency and signal integrity of the system.

[0041] In this embodiment of the present application, the unit control board interacts with the external controller through a communication interface to control and detect the state of the power amplifier.

[0042] Specifically, the unit control board realizes the start-stop control, fault alarm, parameter setting and power adjustment of the power amplifier by bidirectional data exchange with the external controller through the communication interface, and feeds back various types of running state information collected to the controller, and receives the instructions of the controller. The unit control board has built-in automatic protection logic, which can automatically cut off the power supply of the corresponding power amplifier when detecting abnormal input signal, abnormal power supply or module over-temperature and other states, prevent equipment damage, and improve the reliability and safety of the system.

[0043] The synthesizer comprises a multi-stage synthesis structure, a first-stage synthesizer is used to preliminarily synthesize the output signals of the power amplification system, and a second-stage synthesizer is used to synthesize the preliminarily synthesized signals into final output signals again.

[0044] Specifically, the synthesizer adopts a multi-stage synthesis structure design, which can effectively improve the synthesis efficiency and phase consistency of the signals. In the first-stage synthesis process, the signals output by the multiple power amplification systems are first input in parallel to the first-stage synthesizer to complete preliminary amplitude synthesis and phase adjustment, thereby ensuring the preliminary synchronization of the signals of different channels. After the first-stage synthesis, the signals enter the second-stage synthesizer to further perform fine phase compensation and amplitude equalization on the signals, and finally output stable synthesized signals. The hierarchical synthesis scheme can effectively reduce signal interference and energy loss in the synthesis process, simplify the internal structure complexity of the synthesizer, and improve the maintainability and expandability of the equipment.

[0045] The current sampling module is arranged on the output path of the multiple power amplifiers and is used to collect the output current signals of the power amplifiers and feed back the collected current signals to the unit control board.

[0046] Specifically, the current sampling module is arranged in the output path of the power amplifier and detects the current by using a Hall sensor or a shunt resistor, which can monitor the output current of each power amplifier in real time. The collected current signals are transmitted to the unit control board after analog-to-digital conversion, the running state of each power amplifier is analyzed by the unit control board, and the output power of the module is adjusted according to the detection result, so as to ensure that the power amplifiers of the system work within a reasonable current range and avoid damage caused by overcurrent due to load changes or environmental temperature fluctuations. In addition, the current sampling module can also realize rapid positioning of the fault state and improve the maintenance efficiency of the system.

[0047] Reference Figure 1Also include a controller, power distribution unit and switching power supply, in particular, the controller through the communication interface between the signal source, exciter, power amplifier system, preamplifier, synthesizer, directional coupler, realize the start, shutdown, fault diagnosis and parameter setting control of each module, the controller can according to the preset logic, automatically according to the external input signal changes, adjust the working mode of power amplifier system, ensure the stability of the output signal; Power distribution unit will 380V alternating current distribution to switching power supply, exciter, power distributor, synthesizer and filter equipment; The number of switching power supply is two, the input voltage is 380V alternating current, the output voltage is 48V direct current, and has test mode, can reduce the working voltage to 36V under the carrier without modulation state, switching power supply is realized by high frequency switching technology, adopts centralized power supply design, through the distributed power distribution module to each power amplifier system, and is equipped with overvoltage, overcurrent, short circuit protection function, improves the stability of power supply, ensures the reliable operation of the system under different working conditions.

[0048] Referring to Figure 1 The controller is connected with the upper computer monitoring system, and the upper computer monitoring system is used for monitoring and managing the running state of the system.

[0049] In particular, the upper computer monitoring system adopts the form of software platform, is connected with the controller through the data bus, can collect the running parameters of the amplification and synthesis system in real time, and displays the state information of each module through the man-machine interface. The upper computer monitoring system supports event recording function, can automatically record the fault events and state changes in the system running process for tracking analysis by the operation and maintenance personnel. At the same time, the monitoring system supports remote access function, which is convenient for technicians to realize remote monitoring and remote diagnosis of the system through local area network or internet, greatly improves the operation and maintenance efficiency and equipment use safety.

[0050] Working principle: first, the original signal generated by the external signal source is transmitted to the exciter through the input interface, the exciter pre-processes the signal, adjusts the amplitude of the input signal to the preset standard, ensures that the signal meets the amplification condition, and the signal processed by the exciter enters the preamplifier, further improves the signal amplitude, provides sufficient input level for subsequent power amplification;

[0051] Subsequently, the amplified signal is distributed to multiple power amplifier systems by the power distributor in proportion, each power amplifier system includes a distribution module, a power amplifier, a power synthesis module, a directional coupler and a unit control board, which can independently complete the amplification processing of the input signal.

[0052] Inside the power amplification system, the distribution module first distributes the input signal to multiple power amplifiers, the power amplifiers complete step-by-step amplification according to the characteristics of the input signal, and output the amplified signal to the power synthesis module, the power synthesis module synthesizes the output signals of multiple power amplifiers to ensure the consistency of signal amplitude and the synchronization of phase, thereby improving the overall amplification efficiency and consistency of the signal;

[0053] The signals amplified by each power amplification system are output to the total synthesizer, the synthesizer collects the signals from different power amplification systems according to the preset logic, completes the amplitude superposition and phase adjustment of multiple signals, and forms a unified high-power output signal;

[0054] A filter is arranged between the synthesizer and the final output, which is mainly used to suppress out-of-band spurs and noise signals, improve the spectral purity of the output signal, and prevent the normal operation of the system from being affected by stray signals;

[0055] The filtered signal passes through a directional coupler, which can realize directional control of the signal, avoid damage to the previous stage equipment caused by reflected signal backflow, and provide part of the detection signal to the unit control board to realize online monitoring of the signal quality;

[0056] During system operation, the unit control board will collect the operating current, voltage and temperature data of each power amplifier in real time, and feed back the monitoring information to the controller, the controller dynamically adjusts the operating state of each power amplification system according to the collected data, ensures that the entire amplification and synthesis system works in a safe and stable condition, in addition, the host computer monitoring system can realize real-time monitoring, fault warning and remote diagnosis through data interaction with the controller, and improve the intelligent management level of the system.

[0057] Finally, it should be pointed out that: the above only describes the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A full solid state short wave AM 20 kW broadcast transmitter, characterized in that, The application relates to a power amplifier system, which comprises a signal source, an exciter, a pre-amplifier, a power distributor, a plurality of power amplifier systems, a combiner, a filter and a directional coupler, wherein the signal output by the signal source is sequentially input to the power distributor via the exciter and the pre-amplifier, the output end of the power distributor is connected with the input end of the plurality of power amplifier systems respectively, the output end of the plurality of power amplifier systems is connected to the combiner, the output end of the combiner is connected with the filter and the directional coupler, and the output end of the directional coupler is connected to a load. The plurality of power amplifier systems are connected in parallel in a modular manner and are used for receiving the signals distributed by the power distributor respectively.

2. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 1, characterized in that, Each of the power amplifier systems comprises a distribution module, a plurality of power amplifiers, a power combining module, a directional coupler and a unit control board, the distribution module inputs the received signals to the plurality of power amplifiers, the output end of the plurality of power amplifiers is connected to the power combining module, and the output end of the power combining module is connected to the unit control board through the directional coupler.

3. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 2, characterized in that: The unit control board is connected with an external controller through a communication interface to realize signal interaction, control of the power amplifiers and state detection.

4. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 3, characterized in that: Each of the power amplifier systems comprises four power amplifiers, the distribution module is a four-distributor, and the power combining module is a four-combiner.

5. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 3 or 4, characterized in that: The application further comprises a controller power distribution unit and a switching power supply, the controller is used for controlling the working states of the signal source, the exciter and the plurality of power amplifier systems, the power distribution unit distributes 380V alternating current to each device, and the switching power supply provides 48V direct current power supply for each power amplifier system.

6. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 5, characterized in that: The controller is connected with an upper computer monitoring system, and the upper computer monitoring system is used for monitoring and managing the system running state.

7. The all solid state short wave AM 20 kW broadcast transmitter as claimed in claim 1, wherein: ​ 8. The all-solid-state short-wave AM 20 kW broadcast transmitter according to claim 7, characterized in that: ​

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