Medium-wave antenna automatic switching circuit

Abstract

The utility model discloses a medium-wave antenna automatic switching circuit which comprises an A machine, a B machine, a dummy load and an antenna, a switching execution device is arranged between the A machine and the dummy load and between the B machine and the dummy load, and a switching execution device is also arranged between the A machine and the antenna and between the B machine and the antenna. And the signal sampling circuit is connected with the machine A and the machine B, and the signal sampling circuit is used for generating two available transmitter state indication signals according to the working states of the machine A and the machine B. The antenna switching circuit has an intelligent automatic switching function, so that the startup or the switching of the main and standby machines does not need human intervention, and the operation is convenient and fast; under the maintenance mode, manual switching can be achieved, and maintenance machines can be selected conveniently; and the panel indication is visual and clear, and the operation condition is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit switching, in particular to an automatic switching circuit for a medium wave antenna. Background Art

[0002] The traditional antenna switching switch has the following disadvantages: the operation procedure of switching the main and standby transmitters is complicated (first shut down, then switch the antenna switch, and then check in place to start the standby machine), often requires more than two people to cooperate in the operation, delays the broadcast time, and there is no indication of in place, easy to operate incorrectly, and there are safety hazards (especially on rainy days). In view of these shortcomings of the traditional antenna switching switch, we have successfully developed an automatic switching system for medium wave antennas, whose main functions are: in automatic mode, this switch will automatically lock the output of the working machine at the transmitting antenna position according to the closing status of the main power supply of the current main and standby transmitters, or lock the output of the transmitter that is put into operation first at the transmitting antenna position, and lock the output of the transmitter that is not (or later) running at the dummy load position; in maintenance (manual) mode, the output position of the transmitter will be manually controlled to facilitate the maintenance of technicians; in the default state, the switching switch has only one state: the main machine is connected to the antenna and the standby machine is connected to the dummy load. The antenna switching system is intelligent and automatic. It does not require human intervention to start up or switch between the main and standby machines, which is convenient and fast. In maintenance mode, it can be switched manually (manually) for easy maintenance. The panel instructions are intuitive and clear, etc. Utility Model Content

[0003] The purpose of the utility model is to provide a medium wave antenna automatic switching circuit to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical solutions: a medium wave antenna automatic switching circuit, 1. comprising an A machine, a B machine, a dummy load and an antenna, wherein a switching execution device is provided between the A machine and the B machine and the dummy load, and a switching execution device is also provided between the A machine and the B machine and the antenna;

[0005] A signal sampling circuit is also provided, which is connected to the A machine and the B machine. The signal sampling circuit is used to generate two available transmitter status indication signals according to the working status of the A machine and the B machine.

[0006] Furthermore, the switching execution devices at the dummy load and the antenna are set in opposite positions and will not be connected to machine A or machine B at the same time.

[0007] Furthermore, an intelligent logic control circuit is provided in the switching execution device, and the intelligent logic control circuit is composed of R3, R4, Q1, and Q2. The intelligent logic control circuit is connected to the signal sampling circuit and the driving circuit.

[0008] Furthermore, the driving circuit is composed of R7, R8, R9, Q3, and Q4, and the driving circuit is connected to the intelligent logic control circuit, the switching execution device, and the connection indication circuit.

[0009] Furthermore, the switching execution device is composed of J1 and J2, which are connected to the driving circuit and perform corresponding switching operations according to the driving voltage provided by the driving circuit.

[0010] Furthermore, a connection indication circuit is provided, which is connected to the driving circuit and displays the connection status among the A machine, the B machine, the antenna and the dummy load according to the driving voltage provided by the driving circuit.

[0011] Furthermore, a transistor is used as a control circuit.

[0012] Further, a vacuum relay is used as a changeover switch.

[0013] Technical effects and advantages of the utility model:

[0014] 1. The traditional antenna switching system uses a motor-driven knife-type coaxial switch, which has a very slow switching speed and cannot be switched while the transmitter is working. This automatic antenna switching system uses a vacuum relay to replace the motor and knife-type coaxial switch, which reduces weight and volume, is more convenient to install, greatly improves the switching speed, and can be switched while the transmitter is working.

[0015] 2. This application uses a crystal triode as the control circuit. Compared with the traditional relay control circuit, it has a small operating current, less heat, no noise, strong anti-interference ability, is more stable, safe and reliable, and the panel indication is intuitive and clear.

[0016] 3. This application uses a dummy load to keep machine B in a continuous operating state when it is not participating in the circuit signal operation, so that machine B can quickly enter the operating state when machine A and machine B are switched, reducing the switching delay time, while also continuing to keep machine A in a dummy operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the circuit switching structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of the circuit of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model provides Figure 1-2 The automatic switching circuit of a medium wave antenna shown in the figure specifically comprises an A unit, a B unit, a dummy load and an antenna.

[0021] The power supply of the power amplifier board of machine A samples AC220V as the sampling signal of machine A;

[0022] The power supply of the amplifier board of machine B samples AC220V as the sampling signal of machine B;

[0023] R represents resistor, D represents diode, Q represents transistor (usually triode or field effect tube); J represents relay, J1 is common relay, J2 is vacuum relay; K represents switch; JX represents wiring contact or terminal;

[0024] The radio frequency output of the A machine, the radio frequency output of the B machine, the antenna and the dummy load are fixedly connected to the switching execution device, and the switching operation is performed inside the switching execution device;

[0025] The sampling signals of machine A and machine B are connected to the switching execution device and connected to the intelligent logic control circuit;

[0026] The intelligent logic control circuit is composed of R3, R4, Q1, and Q2. The output of the intelligent logic control circuit serves as the control signal of the drive circuit in the system, so that the drive circuit outputs the corresponding driving voltage.

[0027] The driving circuit is connected to the switching execution device, and the switching execution device (and the connection indication circuit) makes corresponding actions and indications according to the output of the driving circuit.

[0028] The switching execution device is composed of J1 and J2, and is used to connect to the A machine, the B machine, the antenna and the dummy load. The switching execution device is used to connect the A machine or the B machine to the antenna, and at the same time connect the other A machine or the B machine to the dummy load;

[0029] A signal sampling circuit is connected to the A machine and the B machine, and the signal sampling circuit is used to generate two available transmitter status indication signals according to the working status of the A machine and the B machine; an intelligent logic control circuit is connected to the signal sampling circuit and the driving circuit, and the intelligent logic control circuit is used to generate an instruction that the current state of the main transmitter is the A machine or the B machine under the two transmitter status indication signals, and lock the other state instruction of the A machine or the B machine to prevent the switching execution device from malfunctioning due to the change of the state of the other transmitter;

[0030] The driving circuit is composed of R7, R8, R9, Q3, and Q4, and is connected to the intelligent logic control circuit and the switching execution device. The driving circuit provides a driving voltage for the switching execution device according to the instructions generated by the intelligent logic control circuit; according to the driving voltage provided by the driving circuit, the switching execution device performs the corresponding switching operation;

[0031] The connection indication circuit is connected to the switching execution device, and indicates the connection status among the A machine, the B machine, the antenna and the dummy load according to the action of the switching execution device.

[0032] Working example 1: In automatic mode, if the host (machine A) is closed, the sampling circuit composed of R1, D1, R2, and C1 outputs a high level, forcing the intelligent judgment locking circuit composed of Q1, Q2, R3, and R4 to output a low level. At this time, even if the standby machine is closed, it will not affect the output low level of this circuit, so that the push circuit is closed, J2 cannot be attracted, and is in the normally open state. The output of the main (A) machine is locked in the antenna position, and the output of the standby (B) machine is locked in the dummy load position. The indication circuit indicates synchronously through the normally closed contact of J1.

[0033] Working example 2: In automatic mode, if the standby (B) machine is switched on, the sampling circuit composed of R5, D2, R6, and C2 outputs a high level, forcing the intelligent judgment and locking circuit composed of Q1, Q2, R3, and R4 to output a high level. At this time, even if the main (A) machine is switched on, it will not affect the output high level of this circuit, forcing the driving circuit to conduct and work, J2 is energized and in a normally closed state, the output of the standby (B) machine is locked in the antenna position, and the output of the main (A) machine is locked in the dummy load position, and the indication circuit indicates synchronously through the energization of J1.

[0034] Working example 3: In automatic mode, if the main (A) and standby (B) transmitters are both working, with the output of A at the antenna position and the output of B at the dummy load position, and A is suddenly turned off (due to a fault or human error), the intelligent judgment locking circuit immediately outputs a high level, forcing the driving circuit to conduct and work, and the vacuum relay J2 is closed, instantly sending the output of the standby (B) transmitter to the antenna to maintain normal broadcasting. Vice versa.

[0035] In the inspection mode, K1 is in the manual position. At this time, the on / off of K2 forces the driving circuit to be turned on or off, thereby controlling the attraction or closure of J1 and J2, thereby achieving control of the transmitter output position switching and synchronous indication.

[0036] The antenna switching circuit has an intelligent automatic switching function. No human intervention is required to start up or switch the main and standby machines, which is convenient and quick. In the maintenance mode, manual switching is possible, which is convenient for selecting the maintenance machine. The panel indication is intuitive and clear, and the operation is stable and reliable.

[0037] The 15KW dummy load model used in the utility model is: DLF-15KW.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium wave antenna automatic switching circuit, characterized in that: It includes an A machine, a B machine, a dummy load and an antenna, wherein a switching execution device is provided between the A machine, the B machine and the dummy load, and a switching execution device is also provided between the A machine, the B machine and the antenna; A signal sampling circuit is also provided, which is connected to the A machine and the B machine. The signal sampling circuit is used to generate two available transmitter status indication signals according to the working status of the A machine and the B machine.

2. The medium wave antenna automatic switching circuit according to claim 1, characterized in that: The switching execution devices at the dummy load and the antenna are set in opposite positions and will not be connected to machine A or machine B at the same time.

3. The medium wave antenna automatic switching circuit according to claim 2, characterized in that: An intelligent logic control circuit is provided in the switching execution device. The intelligent logic control circuit is composed of R3, R4, Q1, and Q2. The intelligent logic control circuit is connected to the signal sampling circuit and the driving circuit.

4. The automatic switching circuit for medium wave antenna according to claim 3, characterized in that: The driving circuit is composed of R7, R8, R9, Q3, and Q4, and is connected to the intelligent logic control circuit, the switching execution device, and the connection indication circuit.

5. The medium wave antenna automatic switching circuit according to claim 4, characterized in that: The switching execution device is composed of J1 and J2, which is connected to the driving circuit and performs corresponding switching operations according to the driving voltage provided by the driving circuit.

6. The medium wave antenna automatic switching circuit according to claim 4, characterized in that: A connection indicating circuit is also provided, which is connected to the driving circuit and displays the connection status among the A machine, the B machine, the antenna and the dummy load according to the driving voltage provided by the driving circuit.

7. A medium wave antenna automatic switching circuit according to any one of claims 1 to 6, characterized in that: A transistor is used as the control circuit.

8. The medium wave antenna automatic switching circuit according to any one of claims 1 to 6, characterized in that: Use a vacuum relay as a changeover switch.

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