A self-excited combiner with automatic switching function

Abstract

The utility model discloses a kind of self-excitation combiner with automatic switching function, including cabinet and the combiner FPGA module, first coupler, coaxial switch and modulation FPGA module being set in cabinet, the modulation FPGA module is for modulating digital part, the first coupler is for receiving FM signal, the combiner FPGA module is for combining NBB signal and FM signal;The first coupler is connected with the coaxial switch, the coaxial switch is for switching output combiner signal or output original FM signal, in the technical scheme of the utility model, FM power signal is accessed, first by coupler sampling, sampling signal is sent into combiner FPGA module and is combined with processing, the rest power signal is to coaxial switch through circulator, if combiner signal is not output, or unable to output qualified signal, coaxial switch will automatically switch from combiner signal to FM direct signal, can ensure that combiner circuit fails, without affecting the output of existing FM signal.

Description

Technical Field

[0001] This utility model relates to the technical field of self-excited combiner equipment, specifically to a self-excited combiner with automatic switching function. Background Technology

[0002] The technology of transmitting differential data using the Internet is called network differential technology, and the technology of transmitting differential data using FM digital broadcasting technology is called broadcast differential technology. FM digital broadcasting technology - Narrowband Data Broadcasting (NBB) is specifically designed for transmitting differential data. It adopts a shorter frame structure and a smaller interleaving block structure, which makes the modulation and demodulation delay of digital signals relatively small, better meeting the high transmission delay requirements of differential data. For details, please refer to the invention patent with publication number CN113765837A, publication date 2021-12-07, entitled "Modulation Method and System, Equipment and Storage Medium for Narrowband Data Broadcasting". The self-excited combiner used for combining NBB signals and FM signals is called an NBB self-excited combiner. However, when the existing NBB signal self-excited combiner adopts a low-power signal synthesis and direct output scheme, if the combined signal is not output or fails to output a qualified signal, it can only be forced to cut off the entire signal, which will cause the FM signal to be interrupted. Utility Model Content

[0003] The main purpose of this utility model is to provide a self-excited combiner with automatic switching function, which aims to solve the problem that when the existing NBB signal self-excited combiner adopts a low-power signal synthesis and direct output scheme, if the combined signal is not output or fails to output a qualified signal, it can only be forced to cut off the entire signal, which will lead to the interruption of the FM signal.

[0004] To achieve the above objectives, this utility model proposes a self-excited combiner with automatic switching function, including a chassis and a combining FPGA module disposed within the chassis, as well as a first coupler, a coaxial switch, and a modulation FPGA module, all connected to the combining FPGA module. The modulation FPGA module is used to modulate the digital part, the first coupler is used to receive and sample the FM signal, and the combining FPGA module is used to combine the NBB signal and the FM signal. The first coupler is connected to the coaxial switch, which is used to switch between outputting the signal connected to the combining FPGA module and outputting the original FM signal connected to the first coupler.

[0005] Preferably, it also includes a network monitoring interface connected to the modulation FPGA module, the network monitoring interface being used for monitoring the operating status and network upgrades.

[0006] Preferably, it also includes a digital-to-analog converter connected to the combined FPGA module, the digital-to-analog converter being used to convert digital signals into analog signals and perform up-conversion processing.

[0007] Preferably, it further includes a first analog-to-digital converter, through which the first coupler connects to the combined FPGA module.

[0008] Preferably, it further includes a second analog-to-digital converter, through which the combining FPGA module is connected to the NBB signal source.

[0009] Preferably, it also includes a third analog-to-digital converter, through which the combining FPGA module is connected to the DPD coupling input interface.

[0010] Preferably, the chassis includes a front panel, on which function buttons, a display screen and LED status lights are provided. The function buttons, the display screen and the LED status lights are all connected to the combining FPGA module, and the function buttons, the display screen and the LED status lights are all connected to the modulation FPGA module.

[0011] Preferably, the chassis includes a rear panel, on which a power interface, a power switch, a signal input interface, and a signal output interface are provided. The power interface and the power switch are connected, and the signal input interface and the signal output interface are both connected to the combining FPGA module and the modulation FPGA module.

[0012] Preferably, the signal input interface includes an FM signal input interface and an NBB signal input interface. The FM signal input interface is used to input the FM signal, and the NBB signal input interface is used to input the NBB signal. The signal output interface includes an FM signal output interface and an RF output interface. The FM signal output interface is used to output the FM signal, and the RF output interface is used to output the combined output of the FM signal and the NBB radio frequency signal.

[0013] In the technical solution of this utility model, after the FM power signal is input, it is first sampled by the coupler. The sampled signal is sent to the combining FPGA module for combining processing. The remaining power signals are sent to the coaxial switch via the circulator. If the circuit system fails, the coaxial switch will automatically switch from the combining signal to the FM direct signal. This ensures that when each circuit fails, the power output of the original FM signal is restored, without affecting the output of the existing FM signal, thus ensuring normal signal broadcasting. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a self-excited combiner with automatic switching function according to this utility model.

[0016] Figure 2 This is a schematic diagram of the circuit structure of a self-excited combiner with automatic switching function according to this utility model.

[0017] Explanation of icon numbers: 1. Chassis; 2. Combining FPGA Module; 3. Modulation FPGA Module; 4. First Coupler; 41. Coaxial Switch; 5. Front Panel; 51. Display Screen; 52. Function Buttons; 53. LED Status Indicators; 6. Rear Panel; 61. Power Switch; 62. FM Signal Input Interface; 63. NBB Signal Input Interface; 64. FM Signal Output Interface; 65. RF Output Interface; 66. DPD Coupler Input Interface.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] Please refer to Figure 1 and Figure 2 This utility model proposes a self-excited combiner with automatic switching function, including a chassis 1 and a combining FPGA module 2 disposed in the chassis 1, as well as a first coupler 4, a coaxial switch 41 and a modulation FPGA module 3, all connected to the combining FPGA module 2. The modulation FPGA module 3 is used to modulate the digital part, the first coupler 4 is used to receive FM signals and sample them, and the combining FPGA module 2 is used to combine NBB signals and FM signals. The first coupler 4 is connected to the coaxial switch 41, and the coaxial switch 41 is used to switch between outputting the signal connected to the combining FPGA module 2 or outputting the original FM signal connected to the first coupler 4.

[0025] In the technical solution of this utility model, after the FM power signal is input, it is first sampled by the coupler. The sampled signal is sent to the combining FPGA module 2 for combining processing. The remaining power signals are sent to the coaxial switch 41 via the circulator. If the combined signal is not output or fails to output a qualified signal, the coaxial switch 41 will automatically switch from the combined signal to the FM direct signal. This can ensure that when each circuit fails, the power output of the original FM signal is restored, without affecting the output of the existing FM signal, thus ensuring normal signal broadcasting. At the same time, the combined signal can be switched back to the combined signal after the combined signal is restored.

[0026] Specifically, the combining FPGA module 2 includes digital processing parts such as combining and pre-distortion, and the modulation FPGA module 3 includes the modulation FPGA module 3.

[0027] In another embodiment of this utility model, a network monitoring interface connected to the modulation FPGA module 3 is also included. The network monitoring interface is used for monitoring the working status and upgrading the network.

[0028] Specifically, this product provides an RS232 / network monitoring interface, which facilitates the management system to monitor the operating status of the exciter and upgrade the system via the network, enabling unattended operation of the launch system.

[0029] In another embodiment of the present invention, a digital-to-analog converter connected to the combined FPGA module 2 is also included, the digital-to-analog converter being used to convert digital signals into analog signals and perform up-conversion processing.

[0030] Specifically, this product uses direct digital frequency synthesis and digital frequency converters to bring the digital domain as close as possible to the radio frequency side, and combined with excellent digital signal processing algorithms, it provides superior system performance.

[0031] In another embodiment of the present invention, a first analog-to-digital converter is also included, and the first coupler 4 is connected to the combined FPGA module 2 through the first analog-to-digital converter.

[0032] In another embodiment of the present invention, a second analog-to-digital converter is also included, and the combining FPGA module 2 is connected to the NBB signal source through the second analog-to-digital converter.

[0033] In another embodiment of the present invention, a third analog-to-digital converter is also included, and the combining FPGA module 2 is connected to the DPD coupling input interface 66 through the third analog-to-digital converter.

[0034] Specifically, a newly designed digital predistortion (DPD) technology is employed. This technology adaptively predistorts the baseband signal by performing high-speed, high-precision sampling and digital signal analysis on the RF feedback signal, thereby compensating for the linear and nonlinear distortions of the RF output stage. This significantly improves the performance and efficiency of the transmission system. This technology not only compensates for the linear / nonlinear distortion of the power amplifier system but also corrects the linear distortion caused by passive components in the output stage, thus enhancing the performance and signal quality of the transmission system.

[0035] In another embodiment of this utility model, the chassis 1 includes a front panel 5, on which function buttons 52, a display screen 51 and LED status lights 53 are provided. The function buttons 52, the display screen 51 and the LED status lights 53 are all connected to the combining FPGA module 2, and the function buttons 52, the display screen 51 and the LED status lights 53 are all connected to the modulation FPGA module 3.

[0036] Specifically, the LCD includes a 40x2 backlit LCD screen with English characters.

[0037] Function key 52 includes: LEFT, RIGHT, UP, DOWN, OK, ESC.

[0038] LED status lights 53: From left to right and top to bottom, they are as follows: 1: Green light indicates FM input signal; the green light is on when normal. 2: The green light is indicated by a clock; the green light illuminates when the device is locked. 3: Green light NBB input signal indicator; the green light is on when normal. 4: Green light (LO) indicates the phase-locked loop is locked; the green light illuminates when locked. 5: The red light is always off; 6: Red light indicates radio frequency output; red light illuminates when there is no output.

[0039] In another embodiment of this utility model, the chassis 1 includes a rear panel 6, on which a power interface, a power switch 61, a signal input interface, and a signal output interface are provided. The power interface and the power switch 61 are connected. The signal input interface and the signal output interface are both connected to the combining FPGA module 2, and the signal input interface and the signal output interface are both connected to the modulation FPGA module.

[0040] In another embodiment of this utility model, the signal input interface includes an FM signal input interface 62 and an NBB signal input interface 63. The FM signal input interface 62 is used to input the FM signal, and the NBB signal input interface 63 is used to input the NBB signal. The signal output interface includes an FM signal output interface 64 and an RF output interface 65. The FM signal output interface 64 is used to output the FM signal, and the RF output interface 65 is used to output the combined output of the FM signal and the NBB radio frequency signal.

[0041] Specifically, the ports include: The RFOUTRF output interface 65 is used for FM+NBB radio frequency signal output. It is a BNC-K female type with an impedance of 500Ω. This port must not be open-circuited. Please ensure that it is correctly connected to the load before powering on. FMIN is the FM signal input, BNC-K female type, impedance 50Ω; FMOUT is the FM signal output, HNC-K female type, impedance 500Ω. This port must not be open-circuited. Please ensure that it is correctly connected to the load before powering on. RFTEST RF monitoring output, BNC-K cathode, impedance 50Ω; DPDIN is a DPD feedback input, BNC-K female type, impedance 50Ω; TTLIN is a TTL signal input, BNC-K female type, impedance 500Ω; NBBIN is the NBB signal input, BNC-K female type, impedance 500Ω; 10MOUT is a 10MHz clock output, BNC-K female type, impedance 500Ω; 10MIN is a 10MHz clock input, BNC-K female type, impedance 500Ω; 1PPSIN is a 1PPS input, BNC-K female type, with an input impedance of 500Ω. NMS (Network Interface) is an Ethernet port (management port), displayed on a webpage, and supports TCP and UDP protocols. Communication; DATA (network port) is an RJ45 port for IP signal stream input; DIO / TODIN is the second pulse output information, RS232, DB9 male type; RS232 / RS485 (remote control, monitoring) is a remote control and monitoring interface; RS232 / RS485.D89 is a male type. Power switch 61 is a rocker switch with an integrated light; The power interface is a three-pin power socket with a fuse; The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A self-excited combiner with automatic switching function, characterized in that, The system includes a chassis and a combining FPGA module housed within the chassis, as well as a first coupler, a coaxial switch, and a modulation FPGA module, all connected to the combining FPGA module. The modulation FPGA module is used to modulate the digital portion. The first coupler is used to receive and sample FM signals. The combining FPGA module is used to combine NBB and FM signals. The first coupler is connected to the coaxial switch, which is used to switch between outputting a signal connected to the combining FPGA module and outputting the original FM signal connected to the first coupler.

2. The self-excited combiner with automatic switching function as described in claim 1, characterized in that, It also includes a network monitoring interface connected to the modulation FPGA module, which is used for monitoring the operating status and network upgrades.

3. A self-excited combiner with automatic switching function as described in claim 1, characterized in that, It also includes a digital-to-analog converter connected to the combined FPGA module, the digital-to-analog converter being used to convert digital signals into analog signals and perform up-conversion processing.

4. A self-excited combiner with automatic switching function as described in claim 1, characterized in that, It also includes a first analog-to-digital converter, through which the first coupler connects to the combined FPGA module.

5. A self-excited combiner with automatic switching function as described in claim 1, characterized in that, It also includes a second analog-to-digital converter, through which the combining FPGA module connects to the NBB signal source.

6. A self-excited combiner with automatic switching function as described in any one of claims 1-5, characterized in that, The chassis includes a front panel, on which function buttons, a display screen, and LED status lights are provided. The function buttons, the display screen, and the LED status lights are all connected to the combining FPGA module, and the function buttons, the display screen, and the LED status lights are all connected to the modulation FPGA module.

7. A self-excited combiner with automatic switching function as described in claim 6, characterized in that, The chassis includes a rear panel, on which a power interface, a power switch, a signal input interface, and a signal output interface are provided. The power interface and the power switch are connected, and the signal input interface and the signal output interface are both connected to the combining FPGA module and the modulation FPGA module.

8. A self-excited combiner with automatic switching function as described in claim 7, characterized in that, The signal input interface includes an FM signal input interface, a DPD signal input interface, and an NBB signal input interface. The FM signal input interface is used to input the FM signal, the NBB signal input interface is used to input the NBB signal, and the DPD signal input interface is used to connect to the DPD coupling signal detection data of the detection end power amplifier. The signal output interface includes an FM signal output interface and an RF output interface. The FM signal output interface is used to output the FM signal, and the RF output interface is used to output the combined output of the FM signal and the NBB radio frequency signal.

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