Digital television transmitter

Abstract

The utility model discloses a digital television transmitter which comprises a main exciter unit, a standby exciter unit, a radio frequency switching unit, a power amplifier unit, a switching power supply unit and a CCU main control unit. The main exciter unit, the standby exciter unit, the radio frequency switching unit, the power amplifier unit and the switching power supply unit are connected to the CCU main control unit; the power amplifier unit comprises a three-divider unit, three 400W hot plug power amplifier modules, a three-synthesizer unit, a coupler unit and a detector unit; the three-distributor unit is connected to the radio frequency switching unit, one ends of the three 400W hot-plug power amplifier modules are connected to the three-distributor unit, the other ends of the three 400W hot-plug power amplifier modules are connected to the three-synthesizer unit, the three-synthesizer unit is connected to the coupler, and the detector unit is connected to the coupler. According to the digital television transmitter provided by the utility model, the overall structure is simplified through module design.

Description

Technical Field

[0001] The utility model relates to a digital television transmitter. Background Art

[0002] A television transmitter is an electronic device that can modulate image, video signal, and audio signal in accordance with television broadcast standards onto a fixed intermediate frequency, convert them to a specified radio frequency through frequency conversion, and finally output them to a load antenna after power amplification to transmit television wireless signals.

[0003] The existing television transmitters generally have a relatively complex structure, which is not convenient for installation and production. Content of the Utility Model

[0004] The utility model provides a digital television transmitter to solve the above-mentioned technical problems, and specifically adopts the following technical solutions:

[0005] A digital television transmitter includes: a main exciter unit, a standby exciter unit, a radio frequency switching unit, a power amplifier unit, a switching power supply unit, and a CCU main control unit;

[0006] The main exciter unit, the standby exciter unit, the radio frequency switching unit, the power amplifier unit, and the switching power supply unit are connected to the CCU main control unit;

[0007] The main exciter unit and the standby exciter unit are connected to the radio frequency switching unit, the radio frequency switching unit is connected to the power amplifier unit, and the switching power supply unit is connected to the power amplifier unit;

[0008] The power amplifier unit includes: a three-way splitter unit, three 400W hot-swappable power amplifier modules, a three-way combiner unit, a coupler unit, and a detector unit;

[0009] The three-way splitter unit is connected to the radio frequency switching unit. One end of the three 400W hot-swappable power amplifier modules is connected to the three-way splitter unit, and the other end is connected to the three-way combiner unit. The three-way combiner unit is connected to the coupler, and the detector unit is connected to the coupler.

[0010] Further, the 400W hot-swappable power amplifier module includes: an MCU module, a first coupler module, a gain adjustment module, a prevention module, a push module, a three-way splitter module, three 150W power amplifier modules, a three-way combiner module, a second coupler module, and a temperature sensor;

[0011] The first coupler module, the gain adjustment module, the prevention module, the boost module, the three 150W power amplifier modules, the second coupler module, and the temperature sensor are connected to the MCU module.

[0012] Further, the switching power supply unit includes three independent switching power supply modules, and the three switching power supply modules are connected in parallel to form an N+1 backup redundant system.

[0013] Further, the CCU main control unit communicates with the main exciter unit and the standby exciter unit through a serial port.

[0014] Further, the CCU main control unit communicates with the RF switching unit, the power amplifier unit, and the switching power supply unit through a CAN bus.

[0015] Further, the digital TV transmitter includes a first housing, a second housing, a third housing, a fourth housing, a fifth housing, a sixth housing, and a main housing;

[0016] The main exciter unit, the standby exciter unit, the RF switching unit, the power amplifier unit, the switching power supply unit, and the CCU main control unit are respectively arranged in the first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing;

[0017] The first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing are arranged in the main housing.

[0018] Further, the digital TV transmitter further includes a human-machine interaction unit, the human-machine interaction unit is connected to the CCU main control unit, and the human-machine interaction unit is arranged on the main housing;

[0019] The human-machine interaction unit includes a display, an LED indicator, and a control button;

[0020] The display, the LED indicator, and the control button are arranged on the main housing.

[0021] Further, the display is a touch display.

[0022] Further, a first serial interface and a first TCP / IP interface are provided on the sixth housing, and the first serial interface and the TCP / IP interface are connected to the CCU main control unit;

[0023] The main housing is provided with a second serial interface and a second TCP / IP interface. The second serial interface is connected to the first serial interface, and the second TCP / IP interface is connected to the first TCP / IP interface.

[0024] Further, the switching power supply unit further includes a plurality of PWM speed control fans. The plurality of PWM speed control fans are connected to the CCU main control unit, and the plurality of PWM speed control fans are disposed within the main housing.

[0025] The beneficial effect of the present utility model lies in the provided digital television transmitter. The power amplifier unit adopts three 400W hot-swappable power amplifier modules, and the overall structure is simplified through module design.

[0026] The beneficial effect of the present utility model lies in the provided digital television transmitter. Function units such as an exciter, a radio frequency switching unit, a power amplifier, a switching power supply, and a CCU main control unit are placed in different housings and then assembled in the main housing to form a standard cabinet, which has the advantages of simple structure and strong integrity. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 is a schematic diagram of a digital television transmitter of the present utility model;

[0029] Figure 2 is a schematic diagram of a 400W hot-swappable power amplifier module of a digital television transmitter of the present utility model. Detailed Embodiment

[0030] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0033] As Figure 1 Shown in the figure is a digital television transmitter of the present application, which includes: a main exciter unit, a standby exciter unit, a radio frequency switching unit, a power amplifier unit (1000W power amplifier unit), a switching power supply unit, and a CCU main control unit. The main exciter unit, the standby exciter unit, the radio frequency switching unit, the power amplifier unit, and the switching power supply unit are connected to the CCU main control unit. The main exciter unit and the standby exciter unit are connected to the radio frequency switching unit, the radio frequency switching unit is connected to the power amplifier unit, and the switching power supply unit is connected to the power amplifier unit.

[0034] The exciter processes signals using digital technology, has high indicators, complete interfaces, and can be upgraded online via software. The radio frequency switching unit dynamically detects and monitors the presence or absence of the exciter output and alarm signals, and can be remotely controlled for switching, automatically switched, or manually switched.

[0035] Among them, the power amplifier unit includes: a three-way splitter unit, three 400W hot-swappable power amplifier modules, a three-way combiner unit, a coupler unit, and a detector unit. The three-way splitter unit is connected to the radio frequency switching unit, one end of the three 400W hot-swappable power amplifier modules is connected to the three-way splitter unit, the other end is connected to the three-way combiner unit, the three-way combiner unit is connected to the coupler, and the detector unit is connected to the coupler.

[0036] In the embodiments of the present application, the switching power supply unit includes three independent switching power supply modules. The three switching power supply modules are connected in parallel to form an N+1 backup redundant system, backing up each other. If one is damaged, the system can still operate normally. In the embodiments of the present application, three high-quality domestic brand-name high-power 3500W switching power supplies of Huawei Company are used for power supply, with a large margin, high efficiency, low ripple, good anti-interference ability, and good electromagnetic compatibility. The interface of each switching power supply module is in a hot-swap mode, which is convenient for replacement and maintenance.

[0037] In the embodiments of the present application, the CCU main control unit communicates with the main exciter unit and the standby exciter unit through a serial port. It real-time detects operating parameters such as the exciter frequency, power output, shoulder, modulation error rate, etc. and displays them on the touch screen. The CCU can accept remote control commands or local touch screen operations to perform switch control and modify the operating parameters of the exciter.

[0038] In the embodiments of the present application, the CCU main control unit communicates with the RF switching unit, the power amplifier unit, and the switching power supply unit through the CAN bus.

[0039] The RF switching unit has an automatic / manual switching function for the exciter. The CCU main control unit communicates with the RF switching unit through the CAN bus. The CCU main control unit can accept remote control commands or local touch screen operations to modify the automatic / manual switching mode of the switcher and can also switch the exciter.

[0040] The CCU main control unit communicates with the 1000W power amplifier unit through the CAN bus. The CCU main control unit can accept remote control commands or local touch screen operations to control the power output size of the power amplifier unit and can also control the switch of the 48V regulated power supply (CAN communication) to achieve power output and shutdown. The power amplifier unit couples the forward and reverse power into an RF signal through the coupler unit, and then converts the coupled RF signal into a DC voltage signal through the detector unit. The temperature is converted into a DC current signal through the temperature sensor. The CCU main control unit detects the temperature and power output of the power amplifier unit through analog quantity acquisition. When abnormal, it turns on the alarm indicator light and performs protection operations such as reducing power or shutting down power.

[0041] As Figure 2 shown, in the embodiments of the present application, the 400W hot-swap power amplifier module includes: an MCU module, a first coupler module, a gain adjustment module, a prevention module, a push module, a three-way distribution module, three 150W power amplifier modules, a three-way synthesis module, a second coupler module, and a temperature sensor. The first coupler module, the gain adjustment module, the prevention module, the push module, the three 150W power amplifier modules, the second coupler module, and the temperature sensor are connected to the MCU module. The MCU module is connected to the CCU main control unit.

[0042] Specifically, the RF signal is amplified by a driver amplifier and then three-way split, and enters three power amplifier modules for amplification respectively. After passing through port protection and matching, it enters a three-way combiner to complete 400W power combination. Specifically, the power amplifier tube uses the BLF989E produced by AMPLEON Company, which is optimized for high-power digital RF power amplifiers in the UHF band, achieving a breakthrough 50% (180W digital power Doherty power amplifier) TV transmission efficiency, which can significantly reduce the power consumption of the TV system and improve the quality of the RF signal and the overall efficiency of the machine. The 400W hot-swappable power amplifier module has the characteristics of modularity, good dust-proof, high temperature resistance, perfect protection functions (over-temperature, over-heat, over-push of output power), and easy replacement.

[0043] A directional coupler (the second coupler module) is designed and installed at the output port of the power amplifier, which has a directional detection function. When the antenna feeder system is mismatched, it can completely introduce the reflected signal at the output end of the device into the protection detection circuit to protect the final-stage power amplification module, thereby improving the working reliability of the whole machine. When any one of the amplification components in the power amplifier module fails, the other power amplifiers can still work normally, ensuring that the accident rate of broadcast interruption is reduced to the lowest.

[0044] The MCU module communicates with the CCU main control unit through the CANbus bus, providing the forward and reverse power, voltage, current, temperature alarm parameter status, etc. of the module. At the same time, the CCU main control unit provides DC5V to the control board through the CANbus interface.

[0045] The 20dB coupler (the first coupler module) couples the input 400W RF signal of the power amplifier into a smaller RF signal and sends this signal to the MCU module. The detection chip in the MCU converts this coupled RF signal into a DC voltage signal to achieve the detection of the input signal of the 400W power amplifier (RFin detection). The MCU module performs gain adjustment processing on the input 400W RF signal of the power amplifier through the CATV module (TG module). When the input signal is small, if the signal gain value is not increased, the 400W power amplifier will not reach the rated output power. The TG module can achieve a gain adjustment of 0 - 30dB through an externally applied 0 - 5V voltage adjustment.

[0046] The MCU module detects the current of the power amplifier tubes in the pre-amplifier module and the three 150W power amplifier modules through current sensors. After the current exceeds the threshold value, the CCU main control unit will perform relevant protection operations on this 400W power amplifier alone.

[0047] The MCU module also detects the temperature of the 400W power amplifier module through a temperature sensor. After the temperature exceeds the threshold value, the CCU main control unit will perform relevant protection operations on this 400W power amplifier alone.

[0048] The output signal of the 400W power amplifier is coupled into a radio frequency signal through a coupler at the power output end, and this signal is sent to the MCU module. The detection chip in the MCU module converts this coupled radio frequency signal into a DC voltage signal to achieve the detection of the output power of the 400W power amplifier. When the power is abnormal, the CCU main control unit will perform relevant protection operations on this 400W power amplifier alone.

[0049] In an embodiment of the present application, the digital television transmitter includes a first housing, a second housing, a third housing, a fourth housing, a fifth housing, a sixth housing, and a main housing.

[0050] The main exciter unit, standby exciter unit, radio frequency switching unit, power amplifier unit, switch power supply unit, and CCU main control unit are respectively arranged in the first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing. The first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing are arranged in the main housing. Specifically, the main housing is a 19-inch standard cabinet, which has the advantages of simple structure and strong integrity. The outer surface of the cabinet adopts the anti-corrosion process of electro-galvanizing and then spraying plastic, and is formed by high-precision numerical control machining of high-strength cold-rolled steel plates, with excellent overall structural performance.

[0051] In an embodiment of the present application, the digital television transmitter further includes a human-computer interaction unit, which is connected to the CCU main control unit and is arranged on the main housing.

[0052] The human-computer interaction unit includes a display, LED indicators, and control buttons. The display, LED indicators, and control buttons are arranged on the main housing. In an embodiment of the present application, the display is a touch display.

[0053] In an embodiment of the present application, a first serial interface and a first TCP / IP interface are provided on the sixth housing, and the first serial interface and the TCP / IP interface are connected to the CCU main control unit.

[0054] A second serial interface and a second TCP / IP interface are provided on the main housing. The second serial interface is connected to the first serial interface, and the second TCP / IP interface is connected to the first TCP / IP interface. The CCU main control unit provides a network port and a serial port externally, and can realize the functions of remote control and remote measurement.

[0055] In an embodiment of the present application, the switch power supply unit further includes a number of PWM speed regulation fans, which are connected to the CCU main control unit and are arranged in the main housing.

[0056] The CCU main control unit has the functions of collecting and controlling the speed of the PWM speed-regulated fan. The starting temperature and full-speed temperature of the fan can be set through the touch screen operation. In this way, the CCU main control unit can realize the control of the fan speed according to the collected real-time temperature.

[0057] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the above embodiments do not limit the present utility model in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present utility model.

Claims

1. A digital television transmitter, characterized in that, It includes: a main exciter unit, a standby exciter unit, a radio frequency switching unit, a power amplifier unit, a switching power supply unit, and a CCU main control unit; The main exciter unit, the standby exciter unit, the radio frequency switching unit, the power amplifier unit, and the switching power supply unit are connected to the CCU main control unit; The main exciter unit and the standby exciter unit are connected to the radio frequency switching unit, the radio frequency switching unit is connected to the power amplifier unit, and the switching power supply unit is connected to the power amplifier unit; The power amplifier unit includes: a three-way distributor unit, three 400W hot-swappable power amplifier modules, a three-way combiner unit, a coupler unit, and a detector unit; The three-way distributor unit is connected to the radio frequency switching unit. One end of the three 400W hot-swappable power amplifier modules is connected to the three-way distributor unit, and the other end is connected to the three-way combiner unit. The three-way combiner unit is connected to the coupler, and the detector unit is connected to the coupler.

2. The digital television transmitter according to claim 1, wherein The 400W hot-swappable power amplifier module includes: an MCU module, a first coupler module, a gain adjustment module, a prevention module, a push module, a three-way distribution module, three 150W power amplifier modules, a three-way synthesis module, a second coupler module, and a temperature sensor; The first coupler module, the gain adjustment module, the prevention module, the push module, the three 150W power amplifier modules, the second coupler module, and the temperature sensor are connected to the MCU module.

3. The digital television transmitter according to claim 1, wherein The switching power supply unit includes three independent switching power supply modules, and the three switching power supply modules are connected in parallel to form an N+1 backup redundant system.

4. The digital television transmitter according to claim 1, wherein The CCU main control unit communicates with the main exciter unit and the standby exciter unit through a serial port.

5. The digital television transmitter according to claim 1, wherein The CCU main control unit communicates with the radio frequency switching unit, the power amplifier unit, and the switching power supply unit through a CAN bus.

6. The digital television transmitter according to claim 1, wherein The digital television transmitter includes a first housing, a second housing, a third housing, a fourth housing, a fifth housing, a sixth housing, and a main housing; The main exciter unit, the standby exciter unit, the radio frequency switching unit, the power amplifier unit, the switching power supply unit, and the CCU main control unit are respectively arranged in the first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing; The first housing, the second housing, the third housing, the fourth housing, the fifth housing, and the sixth housing are arranged in the main housing.

7. The digital television transmitter according to claim 6, wherein The digital television transmitter further includes a human-machine interaction unit, which is connected to the CCU main control unit and is arranged on the main housing; The human-machine interaction unit includes a display, an LED indicator light, and control buttons; The display, the LED indicator light, and the control buttons are arranged on the main housing.

8. The digital television transmitter according to claim 7, wherein The display is a touch display.

9. The digital television transmitter according to claim 6, wherein A first serial interface and a first TCP / IP interface are provided on the sixth housing, and the first serial interface and the TCP / IP interface are connected to the CCU main control unit; A second serial interface and a second TCP / IP interface are provided on the main housing, the second serial interface is connected to the first serial interface, and the second TCP / IP interface is connected to the first TCP / IP interface.

10. The digital television transmitter according to claim 6, wherein The switching power supply unit further includes a plurality of PWM speed regulation fans, and the plurality of PWM speed regulation fans are connected to the CCU main control unit and are arranged inside the main housing.

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