CN217721162U - Automatic switching device for high-voltage antenna - Google Patents

Abstract

The utility model provides a high voltage antenna automatic switching device, include: emission signal selection and protection circuit: when the two sets of medium wave navigation equipment share one antenna, a transmitting signal firstly passes through a first group of high-voltage vacuum relays, the normally closed ends of the first group of high-voltage vacuum relays are connected with a lightning ground, a second group of high-voltage vacuum relays have a transmitting signal selection function, and the normally closed ends of the second group of high-voltage vacuum relays are connected with a No. 1 machine by default; the third group of high-voltage vacuum relays has an antenna protection function, and the normally closed ends of the third group of high-voltage vacuum relays are grounded in a lightning-protection manner, so that the third group of high-voltage vacuum relays play a lightning-protection role when not used; the control circuit is used for controlling the first group of high-voltage vacuum relays, the second group of high-voltage vacuum relays and the third group of high-voltage vacuum relays to be closed, and the input ends of control signals of the control circuit are on-off signals of the two sets of medium wave navigation equipment.

Description

A high-voltage antenna automatic switching device

technical field

The utility model relates to the technical field of high-voltage antennas, in particular to an automatic switching device for high-voltage antennas.

Background technique

With the development of science and technology, the integration of medium wave navigation equipment is getting higher and higher, and the remote control capability has been diversified. At the same time, due to the low price of medium wave navigation equipment, some airports use one station to equip two sets of medium wave navigation equipment It is configured with a pair of AM navigation antennas, but because the antenna feed system of the AM navigation system is a high-voltage part, the general relay cannot complete the remote control switching function, so the AM navigation station cannot fully realize the unattended function.

Utility model content

The purpose of this utility model is to solve at least one of said technical defects.

For this reason, the purpose of this utility model is to propose a kind of high-voltage antenna automatic switching device.

In order to achieve the above purpose, an embodiment of one aspect of the present invention provides a high-voltage antenna automatic switching device, including:

The transmission signal selection and protection circuit: when two sets of medium-wave navigation equipment share a pair of antennas, the transmission signal first passes through the first group of high-voltage vacuum relays, and the normally closed terminals of the first group of high-voltage vacuum relays are connected to the lightning protection ground. The second group of high-voltage vacuum relays has the function of transmitting signal selection, and the normally closed end of the second group of high-voltage vacuum relays is connected to the No. 1 machine by default; the third group of high-voltage vacuum relays has antenna protection functions, and the third group of high-voltage vacuum The normally closed end of the relay is grounded for lightning protection, which acts as an antenna lightning protection when not in use;

The control circuit controls the closing of the first group of high-voltage vacuum relays, the second group of high-voltage vacuum relays and the third group of high-voltage vacuum relays, and the control signal input terminals of the control circuit are the on/off signals of two sets of medium-wave navigation equipment , wherein the second group of high-voltage vacuum relays is controlled by the switch signal of No. 2 machine; wherein, the first group of high-voltage vacuum relays and the third group of high-voltage vacuum relays are output by the switch signals of No. 1 and No. 2 machines through the XOR gate Control to prevent that when two sets of medium wave navigation equipment are turned on at the same time, one of the equipment will be burned because the antenna is not connected;

The time-delayed disconnection circuit: the medium-wave navigation equipment will perform a self-inspection after starting up. After the self-inspection is correct, the transmitter will gradually increase the power to the preset value. The high-voltage vacuum relay has been working and the relay has a load capacity. ; When the device is shut down, the delay disconnection circuit is used to delay disconnection of the high-voltage vacuum relay during shutdown or sudden power failure, so as to protect the device;

Among them, the high-voltage antenna automatic switching device uses a piece of epoxy glass cloth board to fix each device, and the front side is a high-voltage device, and the back side is a low-voltage device. Soldering, the copper wires are too long to be fixed by insulating brackets, and the crossings of the copper wires are isolated by glue sticks; the control circuit on the reverse side is welded on a printed board, and connected to the control terminals of each relay through cables. Cover with a cover.

Further, the control circuit on the reverse side includes: a printed board, a first delayed power-off relay, a second delayed power-off relay, an adapter or an AC-DC module, wherein the adapter or the AC-DC module is connected to an external 220V alternating current , the printing board is respectively connected to the control signal of No. 1 machine and the control signal of No. 2 machine, and the printing board is respectively connected to the first delayed power-off relay and the second delayed power-off relay.

Further, the first group of high-voltage vacuum relays, the second group of high-voltage vacuum relays, and the third group of high-voltage vacuum relays, the protection equipment corresponds to the first group of high-voltage vacuum relays and the second group of high-voltage vacuum relays, and the third group of high-voltage vacuum relays corresponds to 1 , the selection of No. 2 machine, the fifth high-voltage vacuum relay is connected with the protection antenna,

Further, the adapter adopts a 220V to 12V adapter.

Further, the normally closed end of the relay and the transmission signal selection and protection circuit, the core component of the antenna automatic converter is a ceramic high-voltage vacuum relay, and the high-voltage vacuum relay is a single-pole double-throw. For the vacuum medium, disconnecting under load can effectively extinguish the arc; Wear-resistant tungsten contacts, suitable for frequent load operation; two installation methods of flange type and bolt type, bolt type or welded high-voltage joint The additional aspects and advantages of the utility model will be given in the following description, partly It will be apparent from the following description, or learned by practice of the present utility model.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a front connection block diagram of a high-voltage antenna automatic switching device according to an embodiment of the present invention;

Fig. 2 is a reverse connection block diagram of the high-voltage antenna automatic switching device according to an embodiment of the present invention;

Fig. 3 is a functional block diagram of a high-voltage antenna automatic switching device according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The utility model provides an automatic switching device for a high-voltage antenna, which is used for switching between a medium-wave navigation antenna, medium-wave navigation equipment, and a lightning protection ground.

As shown in Fig. 1, the high-voltage antenna automatic switching device of the embodiment of the utility model includes: a transmission signal selection and protection circuit, a control circuit and a delay disconnection circuit.

Specifically, the transmission signal selection and protection circuit: when two sets of medium-wave navigation equipment share one antenna, the transmission signal first passes through the first set of high-voltage vacuum relays, and the NC (normally closed end) of the relay is connected to the lightning protection ground to prevent The circuit failure or the user turns on the machine by mistake, resulting in equipment damage, which plays a role in protecting the equipment; the second group of high-voltage vacuum relays has the function of selecting the transmission signal (No. 1 and No. 2 units), and the NC terminal is connected to No. 1 unit by default; The vacuum relay has an antenna protection function, and the NC terminal is connected to the lightning protection ground, which acts as an antenna lightning protection when not in use.

The control circuit is used to control the closing of the first group of high-voltage vacuum relays, the second group of high-voltage vacuum relays and the third group of high-voltage vacuum relays. The control part mainly controls the closing of the three groups of high-voltage vacuum relays. The control signal input terminals are two sets of The switch signal of wave navigation equipment. Among them, the second group of high-voltage vacuum relays is controlled by the switch signal of No. 2 unit. The first and third groups of high-voltage vacuum relays are controlled by the power-on and off signals of No. 1 and No. 2 units through the XOR gate output to prevent that when two sets of medium-wave navigation equipment are turned on at the same time, one of the equipment will be burned because the antenna is not connected.

Time-delay disconnection circuit: After the AM navigation equipment is turned on, self-check is performed first. After the self-check is correct, the transmitter (if it has been turned on) gradually increases the power to the set value. At this time, the high-voltage vacuum relay is working and the relay has a certain load capacity. , so it can be used normally during startup. When the device is turned off, due to the large internal capacitance of the device, there is still a certain power output in a short period of time after power failure. At this time, if the high-voltage vacuum relay stops working, the device may be damaged, so it is necessary to add a delay to disconnect the circuit. , used to delay disconnection of the high-voltage vacuum relay during shutdown or sudden power failure, and play a role in protecting the equipment.

To sum up, the high-voltage relay is used to switch the transmission signals of two medium-wave navigators, and sends the radio frequency signal of the selected device to the antenna. The relay is a vacuum medium, and it can effectively extinguish the arc when it is disconnected under load. It can withstand tens of thousands of volts instantaneously, and can be operated frequently, with a long service life. The utility model selects a time-delay relay, which is used for delaying disconnection when the control signal disappears, and plays the role of protecting equipment, and the delay time is adjustable. The utility model adopts a logic circuit, and the antenna is connected only when one of the two devices starts and transmits, and the antenna is usually connected to the lightning protection ground. In addition, the utility model adopts an epoxy glass cloth board as a fixed board, the front side is a high-voltage device, and the reverse side is a low-voltage device. The front ceramic high-voltage vacuum relay is fixed on the insulating board by screws, connected by copper wires, fixed by insulating brackets, and isolated by glue sticks at the intersections of copper wires. The control part on the reverse side is welded on a printed board and connected to the control terminals of the relays through cables. Logos are added to each connection on the front and back for easy identification.

In the embodiment of the present utility model, a high-voltage relay is selected, which is a vacuum medium and can effectively extinguish the arc when it is disconnected under load; wear-resistant tungsten contacts are suitable for frequent load operations; two optional installation methods, the French Blue type and bolt type; bolt type or welded high pressure joint, simple wiring. Another kind of time-delay relay is selected. The relay is normally closed, but when the control signal disappears, it will be disconnected after a delay. It is used to protect the equipment. The delay time is adjustable, and the adjustable range is 0.1s-100h. A control logic circuit is selected to control the closure of three sets of high-voltage vacuum relays. The input terminals of the control signals are the on-off signals of two sets of medium-wave navigation equipment, and the second set of high-voltage vacuum relays is controlled by the on-off signals of No. 2 machine. The first and third groups are controlled by the power-on and off signals of No. 1 and No. 2 units through the output of the XOR gate, so as to prevent that when two sets of medium-wave navigation equipment are turned on at the same time, one of the equipment will be burned because the antenna is not connected. The converter fixes each device with an epoxy glass cloth board, the front side is a high-voltage device, and the back side is a low-voltage device. The front ceramic high-voltage vacuum relay is fixed on the insulating board by screws, the radio frequency signal is welded by φ3 copper wire, and the copper wire is too long to be fixed by an insulating bracket, and the intersection of the copper wire is isolated by glue sticks. The control part on the reverse side is welded on a printed board and connected to the control terminals of the relays through cables. There are two covers on the front and back sides, the front side is marked with "antenna automatic converter", and the front and back sides are marked with each connection.

The working process of the high-voltage antenna automatic switching device of the present utility model is described as follows:

(1) When Units 1 and 2 are both turned off, the first and third groups of relays do not act, and the NC terminals are grounded to protect the equipment and antenna.

(2) When the No. 1 machine is turned on and the No. 2 machine is turned off, the first and third groups of relays act, the second group of relays does not act, and the No. 1 machine transmits a signal to the antenna.

(3) When the No. 2 machine is turned on and the No. 1 machine is turned off, the first, second and third groups of relays all act, and the No. 2 machine transmits a signal to the antenna.

(4) When both machines No. 1 and No. 2 are turned on (including No. 1 machine is connected to the antenna, No. 2 machine is connected to the load or No. 2 machine is connected to the antenna, No. 1 machine is connected to the load, or both No. 1 and No. 2 machines are connected to the load), the first The relay in the group does not operate, and units 1 and 2 are both grounded. At this time, the antenna tuner cannot be tuned, and the standing wave ratio of the equipment is alarmed. At this time, the power output is very small to protect the equipment.

(5) If one of the devices needs to be debugged (connected to the load), the control cable on the device to be debugged can be unplugged, and the voltage at this place will automatically become a low voltage, which means that the device is not powered on, and the other one will not be affected at this time normal use of the device.

When the equipment is turned on, the self-test is performed first. After the self-test is correct, the transmitter (if it has been turned on) gradually increases the power to the set value. At this time, the high-voltage vacuum relay is working and the relay has a certain load capacity, so it can be used normally during the start-up phase. When the device is turned off, due to the large internal capacitance of the device, there is still a certain power output in a short period of time after power failure. At this time, if the high-voltage vacuum relay stops working, the device may be damaged, so it is necessary to add a delay to disconnect the relay. , used to delay disconnection of the high-voltage vacuum relay during shutdown or sudden power failure, and play a role in protecting the equipment. The delay time of the delay relay is adjustable, and the adjustable range is 0.1s—100h.

In terms of power supply, in order to ensure the stability and reliability of the equipment, an external independent power supply is used. Adapters or AC/DC modules (220V to 12V) can be selected to supply power to the devices in the converter respectively.

In terms of structure, the converter uses an epoxy glass cloth board (400*400) to fix each device. The layout is shown in Figure 1 and Figure 2. The front side is a high-voltage device, and the back side is a low-voltage device. The front ceramic high-voltage vacuum relay is fixed on the insulating board by screws, the radio frequency signal is welded by φ3 copper wire, and the copper wire is too long to be fixed by an insulating bracket, and the intersection of the copper wire is isolated by glue sticks. The control part on the reverse side is welded on a printed board and connected to the control terminals of the relays through cables. There are two covers on the front and back, and the front is marked with "Automatic Antenna Changer".

Referring to Figure 1 and Figure 2, the input terminals: 2 channels of radio frequency signals of medium wave navigation transmitters, 2 channels of control signals of medium wave navigation transmitters, and 1 channel of mains 220V input. Output terminal: RF signal output (1 way) connected to the through-wall terminal, 1 way connected to the lightning protection ground.

The core component of the antenna automatic converter is a ceramic high-voltage vacuum relay, which has the following advantages:

①Vacuum medium, disconnection under load can effectively extinguish the arc;

② Wear-resistant tungsten contacts, suitable for frequent load operation;

③ Two optional installation methods, flange type and bolt type;

④ Bolted or welded high-pressure joints, easy to connect.

The relay is single-pole double-throw, flange-mounted, welded, the maximum working voltage is 15kv, which can meet the signal output of 500W transmitter

Referring to Figure 3, select 3 groups (4) of high-voltage vacuum relays, and the 2-way transmission signal first passes through the first group (2) of high-voltage vacuum relays. The NC terminals of this group of relays are connected to the lightning protection ground to prevent the failure of the control circuit or the user’s mistakenly starting the machine. , causing damage to the equipment and playing the role of protecting the equipment. The control signal is the output signal after the 2-way switch signal passes through the XOR gate. Only when 1 of the 2-way equipment is turned on, the group of relays will be turned on. Make the transmission signal enter the next relay, and connect the lightning protection ground when both are turned on or turned off. The second group (1 piece) of high-voltage vacuum relay has the function of selecting the transmission signal (No. 1 and No. 2 units). The NC terminal is connected to No. 1 unit by default, and the control signal is the switch signal of No. 2 unit. The third group (1 piece) of high-voltage vacuum relay has the function of antenna protection. The group of relays will be turned on when one of the two devices is turned on, so that the transmission signal is sent to the antenna, and the two devices are connected to the lightning protection ground of the antenna when both are turned on or turned off.

According to the high-voltage antenna automatic switching device of the embodiment of the utility model, the high-voltage relay is selected, and the power-on signal of two sets of equipment is used as the control signal to control the connection and disconnection of each relay to realize the function of automatically connecting the antenna.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be construed as limitations of the present invention. The above-mentioned embodiments can be changed, modified, replaced and modified within the scope of the present utility model under the principle and purpose. The scope of the invention is defined by the appended claims and their equivalents.

Claims (5)

1. An automatic switching device for high-voltage antenna, comprising: a transmission signal selection and protection circuit, a control circuit and a time delay disconnection circuit, wherein,

the transmission signal selection and protection circuit: when two sets of medium wave navigation equipment share one antenna, a transmitting signal firstly passes through a first group of high-voltage vacuum relays, the normally closed ends of the first group of high-voltage vacuum relays are connected with a lightning ground, a second group of high-voltage vacuum relays have a transmitting signal selection function, and the normally closed ends of the second group of high-voltage vacuum relays are connected with a No. 1 machine by default; the third group of high-voltage vacuum relays has an antenna protection function, and the normally closed ends of the third group of high-voltage vacuum relays are grounded in a lightning-proof manner, so that the third group of high-voltage vacuum relays play a lightning-proof role of the antenna when not in use;

the control circuit controls the first group of high-voltage vacuum relays, the second group of high-voltage vacuum relays and the third group of high-voltage vacuum relays to be closed, and the control signal input ends of the control circuit are on-off signals of two sets of medium wave navigation equipment, wherein the second group of high-voltage vacuum relays are controlled by the on-off signals of the No. 2 machine; the first group of high-voltage vacuum relays and the third group of high-voltage vacuum relays are controlled by the power-on and power-off signals of No. 1 and No. 2 after being output through an exclusive-OR gate, so that when two sets of medium wave navigation equipment are simultaneously started, one set of equipment is prevented from being burnt due to the fact that an antenna is not connected;

the delay disconnection circuit: the method comprises the steps that self-checking is carried out after the medium wave navigation equipment is started, after the self-checking is correct, the power of a transmitter is gradually increased to a preset value, a high-voltage vacuum relay works, the relay has loading capacity, and the high-voltage vacuum relay is normally used in a starting stage; when the equipment is shut down, the delay disconnection circuit is used for delaying disconnection of the high-voltage vacuum relay when the equipment is shut down or is suddenly powered off, so that the function of protecting the equipment is achieved;

the high-voltage antenna automatic conversion device adopts an epoxy glass cloth plate to fix all devices, the front side of the high-voltage antenna automatic conversion device is a high-voltage device, the back side of the high-voltage antenna automatic conversion device is a low-voltage device, a front side ceramic high-voltage vacuum relay is fixed on an insulating plate through screws, a radio-frequency signal is welded through a copper wire, the position over the copper wire is fixed through an insulating support, and the cross position of the copper wire is isolated by a bakelite rod; the control circuit of the reverse side is welded on a printed board and is connected to the control end of each relay through a cable, wherein the two sides of the reverse side are covered by two cover plates.

2. The automatic switching device for high-voltage antenna according to claim 1, wherein the control circuit of the reverse side comprises: the adapter or the AC-DC module is connected with external 220V alternating current, the printed board is respectively connected with a No. 1 machine control signal and a No. 2 machine control signal, and the printed board is respectively connected with the first delay power-off relay and the second delay power-off relay.

3. The automatic switching device of claim 1, wherein the protection device comprises a first group of high-voltage vacuum relays, a second group of high-voltage vacuum relays, a third group of high-voltage vacuum relays, the protection device corresponds to the first group of high-voltage vacuum relays and the second group of high-voltage vacuum relays, the third group of high-voltage vacuum relays corresponds to the selection of the No. 1 and the No. 2 machines, and the fifth high-voltage vacuum relay is connected with the protection antenna.

4. The automatic switching device for high-voltage antenna according to claim 2, wherein the adapter is an adapter of 220V to 12V.

5. The automatic switching device for high-voltage antenna according to claim 1, wherein the normally closed terminal of the relay and the transmission signal selection and protection circuit, the core device of the automatic antenna switching device is a ceramic high-voltage vacuum relay, the high-voltage vacuum relay is a single-pole double-throw, and for vacuum medium, the arc can be effectively extinguished when the relay is disconnected under load; wear-resistant tungsten contacts suitable for frequent load operations; the method adopts two mounting modes of a flange type and a bolt type, namely a bolt type or a welding type high-pressure joint.

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