CN114337702A - Near type short wave broadcast transmitting equipment - Google Patents
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Abstract
The invention provides a proximity type short wave broadcast transmitting device which comprises a power supply module, a communication module, a transmitting module and a control module, wherein the power supply module is used for supplying power to the transmitting module; the control module is connected with the transmitting module and used for receiving the feedback signal sent by the transmitting module and carrying out calculation processing; the communication module comprises a wired communication unit and a wireless communication unit, and the wired communication unit is connected to the control module and is used for converting the serial port data signal into a TCP/IP protocol network interface; the wireless communication unit is connected with the control module and used for converting serial port data signals into network signals, and based on cooperation and complementation between the wired communication unit and the wireless communication unit, when any one of the wired communication unit and the wireless communication unit is jammed, the other one can continue to work, so that the stability of remote control operation of the proximity type short-wave broadcast transmitting equipment is improved.
Description
Technical Field
The invention belongs to the technical field of radio waves, and particularly relates to a proximity type short wave broadcast transmitting device.
Background
Broadcast transmitting devices, which may also be referred to as fm transmitters, are popular as a simple communication tool because they allow efficient mobile communications without the need for a relay station. At present, it is widely applied to small-range mobile communication engineering in the fields of production, security, field engineering and the like.
At present, the existing broadcast transmitting equipment generally adopts a traditional form, and because the traditional form of broadcast transmitting equipment does not support networking, the applicable working frequency range is small, the working parameters are single, and the increasingly complex communication requirements cannot be met.
Disclosure of Invention
In view of the problems in the background art, the present invention aims to provide a proximity short wave broadcast transmitting device, which can remotely set working parameters through a network and detect the working states of each module in the device, thereby realizing remote online remote control operation of the broadcast transmitting device; meanwhile, the stability of remote control operation of the broadcast transmitting equipment is improved based on cooperation and complementation between wired communication and wireless communication.
In order to achieve the above object, the present invention provides a proximity short wave broadcast transmitting device, which comprises a power supply module, a communication module, a transmitting module and a control module; the power supply module is electrically connected with the communication module, the transmitting module and the control module; the control module is connected with the transmitting module and used for receiving the feedback signal sent by the transmitting module and carrying out calculation processing; the communication module comprises a wired communication unit and a wireless communication unit, and the wired communication unit is connected to the control module and is used for converting the serial port data signal into a TCP/IP protocol network interface; the wireless communication unit is connected with the control module and used for converting serial port data signals into network signals; the transmitting module is used for receiving the control instruction sent by the control module and converting the received external audio signal into a radio wave signal.
In the proximity type short wave broadcast transmitting device, the control module comprises a storage unit, a communication unit and a control panel; the storage unit is connected to the control board and used for storing data read and written by the control board; the communication unit is connected with the control board, the control board is communicated with the transmitting module through the communication unit to receive the feedback signal sent by the transmitting module, perform calculation processing based on the feedback signal, and send a corresponding control instruction to the transmitting module after the calculation processing.
In the proximity type short wave broadcast transmitting equipment, the communication unit comprises a first serial port communication circuit, an ADC acquisition circuit, a remote control interface and an alarm processing circuit; the control module is connected to the communication module through the first serial port communication circuit; the control module acquires the voltage and the working state of the communication module and the transmitting module through the ADC acquisition circuit; the control module is connected with an external industrial personal computer through the remote control interface; the control module collects alarm information sent by the communication module and the transmitting module through the alarm processing circuit.
In the proximity short wave broadcast transmitting device, the transmitting module comprises a processing unit, the processing unit comprises a processing board and a hybrid, the processing board is used for converting received external audio signals into multiple paths of radio wave signals, and the hybrid is used for synthesizing the multiple paths of radio wave signals into one path of radio wave signal; the hybrid comprises a plurality of multiplier circuits and a plurality of DA circuits; the communication unit further comprises an SPI circuit which is connected with the DA circuits to send corresponding gain control signals to the DA circuits, and each DA circuit is used for converting the received gain control signals into analog signals and sending the analog signals to the corresponding multiplier circuit so that the corresponding multiplier circuit can carry out gain control on the radio wave signals output by the processing board.
In the proximity short wave broadcast transmitting device of the application, the transmitting module comprises an amplifying unit, and the amplifying unit is used for amplifying the received radio wave signals; the communication unit further comprises a PTT circuit, wherein the PTT circuit is connected to the amplifying unit and used for providing bias voltage for the amplifying unit and starting heat dissipation treatment for the amplifying unit.
In the proximity type short wave broadcast transmitting device, the transmitting module comprises a filter, the filter is used for filtering received radio wave signals, and the filter is set to have a plurality of sections of working frequencies; the communication unit further comprises a band control circuit connected to the filter for band control of the filter.
In the proximity short wave broadcast transmitting device of the application, the transmitting module comprises a power detector and an antenna; the power detector is used for performing power detection on the received radio wave signals and sending the radio wave signals to the antenna, and the antenna is used for sending the radio wave signals outwards; the communication unit further comprises a power acquisition circuit, and the power acquisition circuit is connected to the power detector and used for receiving power data sent by the power detector.
In the proximity short wave broadcast transmitting apparatus of the present application, the storage unit includes an EEPROM circuit and a RAM circuit; the EEPROM circuit is used for storing programs and algorithms preset for the control panel, and the RAM circuit is used for storing temporary data in the operation process of the control panel.
In the proximity type short wave broadcast transmitting device of the application, the control board is a DSP control board.
In the proximity short-wave broadcasting transmitting device, the power supply module comprises an alternating current contactor and an AC-DC power supply; the control module further comprises a starting-up control circuit, and the starting-up control circuit is connected to the alternating current contactor and is used for controlling the alternating current contactor to be opened or closed; the AC-DC power supply is connected with the AC contactor, is used for converting the received AC voltage into a primary DC voltage and is set to supply power for the control module, the communication module and the transmitting module.
The invention has the following beneficial effects:
in the application, the wired communication unit of the communication module can convert serial ports such as RS232/485/422 and the like into a TCP/IP protocol network interface, so that bidirectional transparent data transmission between the serial ports such as RS232/485/422 and the TCP/IP protocol network interface is realized; the wireless communication unit can convert serial port data signals such as RS232/485/422 and the like into network signals and realize bidirectional transparent transmission by utilizing a mobile communication network; based on the connection among the wired communication unit, the wireless communication unit and the control module, working parameters can be set remotely through a network, and the working state of each module in the equipment is detected, so that the remote online remote control function of the equipment is realized; meanwhile, based on the cooperation and complementation between the wired communication unit and the wireless communication unit, the wired communication unit and the wireless communication unit can be backed up with each other (the wired communication unit is preferentially used), so that when any one of the wired communication unit and the wireless communication unit is jammed, the other one can continue to work, and the stability of remote control operation of the proximity type short-wave broadcast transmitting equipment is improved.
Drawings
Fig. 1 is an overall schematic diagram of a broadcast transmitting apparatus according to an embodiment of the present invention;
FIG. 2 is a power supply module according to an embodiment of the invention;
FIG. 3 is a schematic view of a processing plate;
FIG. 4 is a schematic diagram of a hybrid;
FIG. 5 is a control module schematic.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," "third," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not necessarily for describing a particular sequential or chronological order. The appearances of "a plurality" in this application are intended to mean more than two (including two).
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 1, the proximity short-wave broadcast transmitting device of the present application includes a power supply module, a communication module, a transmitting module, and a control module.
The power supply module is electrically connected to the communication module, the transmitting module and the control module and used for supplying power to the communication module, the transmitting module and the control module respectively. The transmitting module is connected with the control module and used for receiving the control instruction sent by the control module, converting the received external audio signal into a radio wave signal and simultaneously feeding back a working state signal to the control module in real time. And the control module receives the feedback signal sent by the transmitting module and carries out calculation processing, so that the control module can adjust the work of the transmitting module in time according to the feedback signal, and further closed-loop control is realized. Here, thanks to the modular design of the power supply module, the communication module, the transmitting module and the control module and the information interaction among each other, the short-wave broadcasting transmitting device can work smoothly and realize remote operation.
Referring to fig. 1, the power supply module includes an AC contactor and an AC-DC power supply, the control module includes a power-on control circuit, and the power-on control circuit is connected to the AC contactor for controlling the AC contactor to be opened or closed; the AC-DC power supply is connected with the AC contactor and is used for converting the received AC voltage into DC voltage and outputting the DC voltage to the control module, the communication module and the transmitting module to supply power to the control module, the communication module and the transmitting module. Specifically, when the AC contactor is closed, the AC contactor supplies the 220V AC voltage to the AC-DC power supply, and the AC-DC power supply converts the 220V AC voltage into various operating DC voltages required for the operations of other modules, such as +48VDC, +24VDC, +12VDC, +5VDC, -12VDC, etc.; when the AC contactor is opened, the AC contactor stops supplying the AC voltage to the AC-DC power supply.
In one embodiment, referring to FIG. 2, an AC-DC power supply includes an AC-DC module and a DC-DC module. The AC-DC module is used for converting alternating current voltage into primary direct current voltage, and the DC-DC module is used for converting the primary direct current voltage into secondary direct current voltage. Further, the number of the DC-DC modules is plural, and each DC-DC module is used for converting the primary DC voltage into a secondary DC voltage of a specific magnitude.
Specifically, the number of the DC-DC modules may be 4, the AC-DC module converts 220V AC voltage into +48V primary DC voltage and outputs the primary DC voltage to the outside (i.e., DC +48V operating current is 21A maximum and power capacity is about 1000W, wherein the maximum current directly used as +48V external power supply is 16A and power capacity is 770W), one DC-DC module converts +48V primary DC voltage into +24V secondary DC voltage and outputs the secondary DC voltage to the outside (maximum operating current is 6.25A and power capacity is about 150W), one DC-DC module converts +48V primary DC voltage into +12V secondary DC voltage and outputs the secondary DC voltage to the outside (maximum operating current is 4.2A and power capacity is about 50W), and one DC-DC module converts +48V primary DC voltage into +5V secondary DC voltage and outputs the secondary DC voltage to the outside (maximum operating current is 2A and power capacity is 2W), Power capacity is 24W), a DC-DC module converts the primary DC voltage of +48V into a secondary DC voltage of-12V and outputs the secondary DC voltage outwards (the maximum working current is 0.5A, and the power capacity is 6W).
As shown in fig. 1, the communication module includes a wired communication unit and a wireless communication unit. The wired communication unit can be a serial server and is used for providing a serial-to-network function, and can convert serial ports such as RS232/485/422 and the like into TCP/IP protocol network interfaces, so that bidirectional transparent data transmission between the serial ports such as RS232/485/422 and the TCP/IP protocol network interfaces is realized; and the wired communication unit is connected to the control module, so that working parameters can be set remotely through a network, and the working state of each module in the equipment is detected, thereby realizing the remote online remote control function of the equipment. The wireless communication unit can be a 4G DTU, and is mainly used for transmitting serial port data signals such as RS232/485/422 and the like to the DTU and then converting the serial port data signals into 4G network signals, and realizing bidirectional transparent transmission by utilizing a 4G network of mobile communication; moreover, the wireless communication unit is connected with the control module, so that the remote control function of the equipment is realized; in addition, according to actual needs, the wireless communication unit may also be a 5G DTU, which is configured to convert serial data signals such as RS232/485/422 into 5G network signals after transmitting the serial data signals to the DTU, and implement bidirectional transparent transmission by using a 5G network of mobile communication.
The serial data signal is not limited to the RS485 signal, the RS232 signal or the RS422 signal. In addition, in the communication module, based on the cooperation and complementation between the wired communication unit and the wireless communication unit, the wired communication unit and the wireless communication unit can be backed up mutually (preferentially use the wired communication unit), so that when any one of the wired communication unit and the wireless communication unit is blocked, the other one can continue to work, and the stability of remote control operation of the proximity type short-wave broadcast transmitting equipment is improved.
As shown in fig. 1, the transmitting module includes a processing unit, an amplifying unit, a filter, a power detector, and an antenna. The processing unit is used for converting the received external audio signal into a radio wave signal (RF for short) and sending the radio wave signal to the amplifying unit, the amplifying unit is used for amplifying the radio wave signal sent by the processing unit and sending the radio wave signal to the filter, the filter is used for filtering the radio wave signal sent by the amplifying unit and sending the radio wave signal to the power detector, the power detector is used for detecting the power of the radio wave signal sent by the amplifying unit and sending the radio wave signal to the antenna, and the antenna is used for sending the radio wave signal outwards. Here, based on the cooperation of the processing unit, the amplifying unit, the filter and the power detector, the working frequency of the radio wave signal sent out by the antenna is not only controllable, but also the intensity of the radio wave signal is high and the signal is stable, so that the transmitting module is suitable for increasingly complex communication requirements. In addition, processing unit, amplifying unit, wave filter and power detector all communication connection in control module and be used for sending feedback signal to control module to the operating condition of each unit of control module real time monitoring emission module of being convenient for and alarm information thereof.
As shown in fig. 1, in one embodiment, the processing unit includes a processing board and a hybrid. The processing board is used for receiving external audio signals and converting the received external audio signals into multiple paths of radio wave signals, and the hybrid coupler is used for synthesizing the multiple paths of radio wave signals into one path of radio wave signal and transmitting the radio wave signal to the amplifying unit.
As shown in fig. 3, the processing board includes a second serial port communication circuit, an audio processing circuit, an FPGA circuit, a DDS circuit, and a plurality of balun circuits.
One end of the second serial port communication circuit is connected to the control module, and the other end of the second serial port communication circuit is connected to the FPGA circuit, so that the FPGA circuit can acquire a control instruction sent by the control module and send a feedback signal to the control module. The audio processing circuit is connected with the FPGA circuit and used for converting analog audio signals acquired from the outside into digital audio signals and transmitting the digital audio signals to the FPGA circuit. The FPGA circuit is connected with the DDS circuit and is used for controlling the DDS circuit to generate a plurality of paths of high-frequency modulation signals. The plurality of balance-to-unbalance circuits are arranged in parallel and are respectively connected to the DDS circuit, and each balance-to-unbalance circuit is used for receiving a corresponding high-frequency modulation signal generated by the DDS circuit and converting the received high-frequency modulation signal into a radio wave signal.
Specifically, the audio processing circuit is mainly implemented by a high-performance stereo audio codec chip TLV320AIC23 of TI corporation, which inputs an analog audio signal through a balanced 600 Ω interface, converts the input analog audio signal into a digital audio signal, sends the digital audio signal to the FPGA circuit, and performs AM modulation by the FPGA circuit.
The DDS circuit adopts an AD9959 chip of ADI company, and the AD9959 is composed of four Direct Digital Synthesizer (DDS) cores (at this moment, the FPGA circuit controls the DDS circuit to generate four modulation signals, correspondingly, the number of the balance-to-unbalance circuits is 4), and independent frequency, phase and amplitude control is provided on each channel. The AD9959 may perform 16-level modulation of frequency, phase or amplitude (FSK, PSK, ASK). Moreover, the DDS can simultaneously generate four paths of signals under the control of the FPGA circuit, each path can be independently controlled, and any path in the multiple paths can be controlled to output a single-frequency signal, any two paths output a double-frequency signal and simultaneously output a four-frequency signal. The signal types are CW (standard sine wave signal), AM (amplitude modulation signal), and FM (narrow-band white noise frequency modulation signal), wherein the functions that the DDS circuit can implement are described in detail as follows:
(1) standard sine wave signal: 3-30MHz, variable at 1 Hz; (2) amplitude modulation signal: the carrier frequency is 3-30MHz, the frequency is variable at 1Hz, and the modulation range is 0-100% and is variable every 1%; (3) narrow-band white noise frequency modulation signal: the carrier frequency is 3-30MHz, the frequency is variable at 1Hz, the maximum frequency deviation is +/-100K, and the frequency is variable at 10 Hz; (4) narrow band white noise signal (built-in): the central frequency is 3-30MHz, and the frequency is variable at 1 Hz; the bandwidth is 1kHz 3-30MHz 50 kHz; (5) amplitude of each carrier signal: 12dBm (CW and FM), 6dBm (am); (6) when an AM signal is output: the audio input level is +/-10 dBm, the audio input interface is balanced to 600 omega, the modulation degree is 0-100%, the step is 1%, and the bandwidth is more than or equal to 9 KHz; the audio source is an external signal or a built-in audio source selectable (a built-in 1KHz audio signal); (7) when the FM signal is output: the frequency-modulation frequency deviation is 0 to +/-100 KHz, and the step is 10 Hz; and (3) narrow-band white noise frequency modulation.
The FPGA circuit adopts an XC7A50T-2CSG324 chip of Xilinx (Seignx), which can realize the following functions by programming: (1) based on the working requirement, the DDS circuit is controlled to realize the functions; (2) communicating with the control module in an RS232 communication mode according to an agreed communication protocol to acquire parameter information required during working; (3) receiving a digital audio signal from an audio coding and decoding chip to realize an AM modulation algorithm; (4) narrow-band white noise signals are generated inside, and an FM (narrow-band white noise frequency modulation) modulation algorithm is realized.
As shown in fig. 3, the processing board further includes a FLASH memory circuit, the FLASH memory circuit is connected to the FPGA circuit and used for reading and writing the data in the processing board, and at this time, the FPGA circuit realizes the function of reading and writing the working data through FLASH memory based on programming.
As shown in fig. 3, the processing board further includes a plurality of filter circuits and a plurality of signal monitoring circuits (only 1 is shown in fig. 3). Each filter circuit is connected with one corresponding balance-to-unbalance circuit so as to filter the radio wave signal output by the corresponding balance-to-unbalance circuit; each signal monitoring circuit is connected with one corresponding filter circuit and the FPGA circuit and is used for receiving the radio wave signal sent by one corresponding filter circuit and sending the radio wave signal to the FPGA circuit. Therefore, based on programming, the FPGA circuit can monitor the signal output by the DDS circuit, and further judge whether the DDS works normally, so that the broadcast broadcasting condition of the equipment in a short wave frequency band can be monitored in real time.
As shown in fig. 3, the processing board further includes a power supply circuit, which is connected to the power supply module and is configured to convert the secondary DC voltage output by the DC-DC module of the power supply module into various three-level DC voltages, for example, the power supply circuit converts the +5V secondary DC voltage into +3.3V, +1.8V, +1.0V DC voltage.
As shown in fig. 4, the hybrid includes a plurality of multiplier circuits, a plurality of DA circuits, and at least one stage of power combining circuit.
Each DA circuit is connected with the control module and the corresponding multiplier circuit and is used for converting the gain-controlled digital signal output by the control module into an analog signal and sending the analog signal to the corresponding multiplier circuit; each multiplier circuit receives a corresponding path of radio wave signal output by the balance-to-unbalance circuit and the filter circuit of the processing board and is used for controlling the gain of the corresponding path of radio wave signal, namely, the multiplier can multiply the radio frequency signal with fixed amplitude output by the processing board with a variable analog direct current level to obtain a radio frequency signal with controllable amplitude so as to realize real-time gain control, and the gain amplification factor can be controlled between 0 and 2 times; each primary power synthesis circuit is connected with the corresponding two multiplier circuits and is used for synthesizing the two paths of radio wave signals output by the two multiplier circuits into one path of radio wave signal.
As shown in fig. 4, the number of the first-stage power combining circuits is two or more (including two), and the hybrid device further includes at least one second-stage power combining circuit, where each second-stage power combining circuit is connected to two corresponding first-stage power combining circuits, and is configured to combine two radio wave signals output by the two first-stage power combining circuits into one radio wave signal.
In an embodiment, the DDS circuit generates four modulation signals simultaneously under the control of the FPGA circuit, the number of the first-stage power synthesis circuit is two, the number of the second-stage power synthesis circuit is one, and at this time, no matter which of the 1-stage, 2-stage, or 4-stage radio wave signals is output by the processing board, the hybrid can perform gain control on the signals, then perform first-stage power synthesis circuit synthesis and second-stage power synthesis circuit synthesis, and output 1-stage (possibly including 1 frequency, 2 frequencies, or 4 frequencies, and different amplitudes and magnitudes) radio frequency signals.
As shown in fig. 1, the amplification unit includes a pre-stage amplification circuit and a final-stage amplification circuit. The pre-stage amplification circuit is connected with the processing unit and is used for amplifying the radio wave signal sent by the processing unit; the final stage amplifier circuit is connected to the preceding stage amplifier circuit, and amplifies the radio wave signal sent from the preceding stage amplifier circuit.
Specifically, the pre-stage amplifying circuit adopts a two-stage class A amplifying circuit, the first stage amplifies a radio frequency signal of maximum 6dBm output by the hybrid connector to 21dBm, the gain is 15dB, and the second stage amplifies the radio frequency signal of the maximum 21dBm to 37dBm, and the gain is 16 dB. The working voltage of the pre-stage amplifying circuit is +24V, the provided bias voltage is +12V, and the pre-stage amplifying circuit is provided with a power amplifier tube drain electrode overvoltage detection circuit, a working current detection circuit and a radio frequency signal acquisition circuit so as to judge whether the pre-stage amplifying circuit works normally. The final stage amplifying circuit adopts a one-stage single-tube push-pull circuit, and directly amplifies a 37dBm signal output by the previous stage amplifying circuit to 53.5 dBm. The working voltage of the final-stage amplifying circuit is +48V, the provided bias voltage is +12V, and the final-stage amplifying circuit is provided with a power amplifier tube drain electrode overvoltage detection circuit, a working current detection circuit and a radio frequency signal acquisition circuit so as to judge whether the final-stage amplifying circuit works normally.
In one embodiment, the filter includes a low-pass filter circuit and a high-pass filter circuit, and the radio wave signal transmitted to the filter by the amplification unit includes a fundamental wave portion and a harmonic wave portion. The low-pass filter circuit is capable of passing a fundamental wave portion of the radio wave signal to be transmitted to the antenna via the power detector, and the high-pass filter circuit is configured to consume and absorb a harmonic wave portion of the received radio wave signal by an absorption load, thereby greatly reducing the echo reflection bearing pressure of the final-stage amplification circuit.
Specifically, the low-pass filter circuit has a circuit structure in a 7-order elliptic function form, and the high-pass filter circuit has a circuit structure in a 7-order Chebyshev function form. The working frequency of the proximity type short wave broadcast transmitting equipment is a short wave frequency range which is between 3 and 30MHz, the filter is divided into 6 sections according to the working frequency range, the working frequency of the first section is 3 to 4.499MHz, the working frequency of the second section is 4.5 to 6.499MHz, the working frequency of the third section is 6.5 to 8.999MHz, the working frequency of the fourth section is 9 to 12.999MHz, the working frequency of the fifth section is 13 to 17.999MHz, and the working frequency of the sixth section is 18 to 30 MHz.
In one embodiment, the power detector includes a bi-directional coupler (including two coupling transformers) for coupling to collect the forward power level and/or the reverse power level and transmitting the collected power level to the control module. It should be noted that, in the short-wave frequency band, the distribution parameters of the transformer have little influence on the circuit, so that the transformer has wide application in this frequency band. The transformer can be used for coupling signals, and the coupling has two modes, one mode is series coupling, and the other mode is parallel coupling, wherein the series coupling refers to coupling of a primary side of the coupling transformer in series between a signal source and a main line load, and the parallel coupling refers to coupling of the primary side of the coupling transformer in parallel with the signal source and the main line end load. In the two coupling modes, when different main line ends are used as input, the polarity change of the coupling ends is different. For series coupling, the polarity of the coupling end is related to which main line terminal is used as input, while for parallel coupling the polarity of the coupling end is not related to which main line terminal is used as input, and this difference is the basis for realizing directional coupling. The bi-directional coupler simultaneously uses series and parallel coupling to respectively collect forward voltage, reverse voltage and current signals of a signal source, and forward power and reverse power are obtained through conversion. Specifically, the maximum forward power that can be collected by the power detector is 2 kW.
As shown in fig. 5, the control module includes a storage unit, a power supply unit, a communication unit, and a control board. The storage unit is connected with the control panel and used for storing data read and written by the control panel; the communication unit is connected to the control panel, and the control panel communicates with the transmitting module through the communication unit to make the control panel can in time receive the feedback signal that the transmitting module sent, and carry out calculation processing based on the feedback signal, and send the control command who corresponds to the transmitting module after handling, the power supply unit is used for supplying power to memory cell, communication unit and control panel.
Referring to fig. 5, the memory unit includes a charged erasable programmable read only memory circuit (i.e., an EEPROM circuit) for storing programs and algorithms preset for the control board and a random access memory circuit (i.e., a RAM circuit) for storing temporary data during operation of the control board.
The control board of the control module may be a DSP control board, which is a floating point DSP control board, employing a model TMS320F28335 digital signal processor from TI corporation, and having a high speed processing capability of 150 MHz.
Referring to fig. 5, the communication unit of the control module includes a first serial port communication circuit, an ADC acquisition circuit, a remote control interface, and an alarm processing circuit. The control panel of the control module is connected to the communication module and the transmitting module through a first serial port communication circuit, the control panel acquires the voltage and the working state of the communication module and the transmitting module through an ADC acquisition circuit, the control panel is connected to an external industrial personal computer through a remote control interface, and the control panel acquires alarm information sent by the communication module and the transmitting module through an alarm processing circuit. Thus, based on the programming, the control module implements the following functions: (1) based on the first serial port communication circuit, the control module can communicate with the processing board in an RS232 communication mode to send various control signals of the control board, such as working frequency, a modulation mode, a working mode, an on/off signal and the like; (2) the ADC acquisition circuit is mainly used for acquiring the working state and the power supply voltage of each single board (namely, various circuit boards or chips related to each module) so as to conveniently monitor the working state and the power supply in real time, and specifically, the working state mainly comprises: forward power, reverse power, control board power-on state, pre-amplification drain voltage, pre-amplification working current, pre-amplification output power, final amplification drain voltage, final amplification working current, final amplification output power, box temperature, heat sink temperature, and +48V, +24V, +12V, +5V, -12V, etc.; (3) the remote control interface is connected with a serial port of an external industrial personal computer to receive remote control instructions and upload working state information, so that centralized control and remote scheduling of a plurality of devices can be realized, and the devices can work normally in an emergency state when no one is on duty; (4) based on the alarm processing circuit, various alarms of the equipment are identified and correspondingly processed according to alarm types, wherein the alarm types comprise overvoltage, undervoltage, overtemperature, overcurrent, reverse power alarm, forward power alarm, standing-wave ratio alarm, single board self-checking error and the like, so that the equipment has overvoltage, overcurrent, temperature, standing-wave ratio and unbalance protection functions, and when the equipment alarms, the equipment can be accurately positioned to a corresponding function board, and the fault judgment and maintenance time is shortened.
As shown in fig. 5, the communication unit further includes a Serial Peripheral Interface (SPI) circuit, the SPI circuit is connected to the plurality of DA circuits of the processing board of the transmitting module, and each DA circuit is configured to receive a gain control signal sent by the SPI circuit, so that each multiplier circuit performs real-time gain control on a corresponding radio wave signal output by the processing board.
As shown in fig. 5, the communication unit further includes a PTT circuit (i.e., Push-to-talk, which is a communication mode for sending a signal receiving state by pressing a switch, and is commonly used in a communication channel using a half-duplex mode, including a two-way radio system), the PTT circuit is connected to the amplifying unit of the transmitting module, and when the device needs to transmit, the PTT circuit can provide a bias voltage to the amplifying unit and turn on a fan to perform a heat dissipation process on the amplifying unit.
As shown in fig. 5, the communication unit further includes a band control circuit, the band control circuit is connected to the filter, and based on the operation requirement, the band control circuit can selectively gate the corresponding filter segment according to the operation frequency, so as to implement band control on the filter.
As shown in fig. 5, the communication unit further includes a power acquisition circuit, the power acquisition circuit is connected to the power detector, the control board receives power data (i.e., a forward power level and a reverse power level) sent by the power detector through the power acquisition circuit and performs calculation processing to obtain a forward power value, a reverse power value and a standing wave ratio value when the device transmits power, so that when the device transmits power, the output power of the device can be finely adjusted to meet the use requirement.
The application is to near formula short wave broadcast transmitting equipment based on the collaborative work between power module, communication module, emission module and the control module, has realized the remote control of the transmitting equipment of this application, can broadcast the target frequency in arbitrary 3 operating frequency channels simultaneously, support single-frequency, double-frequency, four-frequency time sharing broadcast, transmit power can finely tune, and output can reach more than 200 KW.
Claims (10)
1. The near-type short-wave broadcast transmitting equipment is characterized by comprising a power supply module, a communication module, a transmitting module and a control module;
the power supply module is electrically connected with the communication module, the transmitting module and the control module;
the control module is connected with the transmitting module and used for receiving the feedback signal sent by the transmitting module and carrying out calculation processing;
the communication module comprises a wired communication unit and a wireless communication unit, and the wired communication unit is connected to the control module and is used for converting the serial port data signal into a TCP/IP protocol network interface; the wireless communication unit is connected with the control module and used for converting serial port data signals into network signals;
the transmitting module is used for receiving the control instruction sent by the control module and converting the received external audio signal into a radio wave signal.
2. The short-wave proximity broadcast transmission apparatus according to claim 1,
the control module comprises a storage unit, a communication unit and a control panel;
the storage unit is connected to the control board and used for storing data read and written by the control board;
the communication unit is connected with the control board, the control board is communicated with the transmitting module through the communication unit to receive the feedback signal sent by the transmitting module, perform calculation processing based on the feedback signal, and send a corresponding control instruction to the transmitting module after the calculation processing.
3. The short-wave proximity broadcast transmission apparatus according to claim 2,
the communication unit comprises a first serial port communication circuit, an ADC acquisition circuit, a remote control interface and an alarm processing circuit;
the control module is connected to the communication module through the first serial port communication circuit;
the control module acquires the voltage and the working state of the communication module and the transmitting module through the ADC acquisition circuit;
the control module is connected with an external industrial personal computer through the remote control interface;
the control module collects alarm information sent by the communication module and the transmitting module through the alarm processing circuit.
4. The short-wave proximity broadcast transmission apparatus according to claim 2,
the transmitting module comprises a processing unit, the processing unit comprises a processing board and a hybrid, the processing board is used for converting received external audio signals into multiple paths of radio wave signals, and the hybrid is used for synthesizing the multiple paths of radio wave signals into one path of radio wave signal;
the hybrid comprises a plurality of multiplier circuits and a plurality of DA circuits;
the communication unit further comprises an SPI circuit which is connected with the DA circuits to send corresponding gain control signals to the DA circuits, and each DA circuit is used for converting the received gain control signals into analog signals and sending the analog signals to the corresponding multiplier circuit so that the corresponding multiplier circuit can carry out gain control on the radio wave signals output by the processing board.
5. The short-wave proximity broadcast transmission apparatus according to claim 2,
the transmitting module comprises an amplifying unit, and the amplifying unit is used for amplifying the received radio wave signals;
the communication unit further comprises a PTT circuit, wherein the PTT circuit is connected to the amplifying unit and used for providing bias voltage for the amplifying unit and starting heat dissipation treatment for the amplifying unit.
6. The short-wave proximity broadcast transmission apparatus according to claim 2,
the transmitting module comprises a filter, the filter is used for filtering the received radio wave signals, and the filter is set to have a plurality of sections of working frequencies;
the communication unit further comprises a band control circuit connected to the filter for band control of the filter.
7. The short-wave proximity broadcast transmission apparatus according to claim 2,
the transmitting module comprises a power detector and an antenna;
the power detector is used for performing power detection on the received radio wave signals and sending the radio wave signals to the antenna, and the antenna is used for sending the radio wave signals outwards;
the communication unit further comprises a power acquisition circuit, and the power acquisition circuit is connected to the power detector and used for receiving power data sent by the power detector.
8. The short-wave proximity broadcast transmission apparatus according to claim 2,
the storage unit comprises an EEPROM circuit and a RAM circuit;
the EEPROM circuit is used for storing programs and algorithms preset for the control panel, and the RAM circuit is used for storing temporary data in the operation process of the control panel.
9. The short-wave proximity broadcast transmitting device of claim 2 wherein the control board is a DSP control board.
10. Short-wave proximity broadcast transmission apparatus according to claim 1,
the power supply module comprises an alternating current contactor and an AC-DC power supply;
the control module further comprises a starting-up control circuit, and the starting-up control circuit is connected to the alternating current contactor and is used for controlling the alternating current contactor to be opened or closed;
the AC-DC power supply is connected with the AC contactor, is used for converting the received AC voltage into a primary DC voltage and is set to supply power for the control module, the communication module and the transmitting module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660641.6A CN114337702A (en) | 2021-12-31 | 2021-12-31 | Near type short wave broadcast transmitting equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111660641.6A CN114337702A (en) | 2021-12-31 | 2021-12-31 | Near type short wave broadcast transmitting equipment |
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| CN209250583U (en) * | 2018-12-26 | 2019-08-13 | 广州众翔信息科技有限公司 | Short-wave signal amplifier |
| CN212210986U (en) * | 2020-06-10 | 2020-12-22 | 杭州众传数字设备有限公司 | Multi-carrier frequency modulation broadcast transmitter |
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| US20100265830A1 (en) * | 2005-11-30 | 2010-10-21 | Masprodenkoh Kabushikikaisha | Monitor device and broadcast radio wave retransmission system |
| CN204539164U (en) * | 2014-09-22 | 2015-08-05 | 陈炳 | The FM broadcasting platform that a kind of small multi-frequency road is sent out altogether |
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Application publication date: 20220412 |