A broadcast transmitter switching apparatus and a switching method thereof

Abstract

The application discloses a broadcast transmitter switching device and a switching method thereof, and the switching device comprises a mechanical carrier and a control unit; the mechanical carrier comprises a cabinet body, a resistor body framework and a fan support are arranged in the lower part of the cabinet body, a first resistor body and a second resistor body are arranged on the resistor body framework, a first fan and a second fan are arranged on the fan support, a first partition plate is arranged on the upper part of the resistor body framework, an external interface plate is arranged on the first partition plate, a second partition plate is arranged in the upper part of the cabinet body, a coaxial converter is arranged on the upper part of the second partition plate, an emergency support is arranged on the lower part of the second partition plate, a front door and a back door are arranged on the cabinet body, a switch, an indicator lamp and a high-frequency power meter are arranged on the front door panel, and the external interface plate and the emergency support are arranged on the inner side of the back door. The application can be effectively applied to the switching of the broadcast transmitter, stable and efficient switching between the main machine, the standby machine, the transmitting antenna and the dummy load can be realized, the performance is stable and reliable, the market prospect is wide, and the application is convenient to popularize and use.

Description

Technical Field

[0001] This invention belongs to the field of broadcast transmission technology, and specifically relates to a broadcast transmitter switching device and its switching method. Background Technology

[0002] According to the national broadcasting policy, all cities at the prefecture level and above in my country should build medium-wave broadcasting transmitters, with the total number exceeding one thousand including repeater stations. Medium-wave broadcasting transmitters are generally selected at a power level of 10kW. To ensure uninterrupted broadcasting, the transmitter configuration consists of one main unit and one backup unit, sharing a dummy load and one antenna. Switching between the main unit, backup unit, antenna, and dummy load is typically done manually, resulting in poor stability, reliability, and automation. Remote computer programming control and unattended operation are not yet possible. The large number of feeder pipes and elbow connections leads to a high failure rate, and the layout of the equipment room and the placement of equipment are disorganized and unsightly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a broadcast transmitter switching device that addresses the shortcomings of the prior art. The device has a simple structure, complete functions, and can be effectively applied to the switching of broadcast transmitters. Combined with the switching method, it can achieve stable and efficient switching between the main unit, the backup unit, the antenna, and the dummy load. It has stable and reliable performance, good performance, broad market prospects, and is easy to promote and use.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a broadcast transmitter switching device, including a mechanical carrier and a control unit; the mechanical carrier includes a cabinet, the lower part of which is provided with a resistor frame and a fan bracket located on one side of the resistor frame; the resistor frame is provided with a first resistor and a second resistor; the fan bracket is provided with a first fan for blowing air to cool the first resistor and a second fan for blowing air to cool the second resistor; the upper part of the resistor frame is provided with a first partition for mounting the control unit; the first partition is provided with an external interface board and an over-temperature protection bracket; the upper part of the cabinet is provided with a second partition located above the first partition; the upper part of the second partition is provided with a coaxial converter; the lower part of the second partition is provided with an emergency bracket; the cabinet is provided with a front door and a rear door; the front door panel is provided with a switch, an indicator light and a high-frequency power meter; the fan bracket is located inside the front door; the external interface board, the emergency bracket and the over-temperature protection bracket are all located inside the rear door.

[0005] The aforementioned broadcast transmitter switching device has an aluminum alloy cabinet, the external dimensions of which are 600mm wide × 836mm deep × 1980mm high.

[0006] The aforementioned broadcast transmitter switching device has a host interface, a backup interface, and an antenna interface on the top of the cabinet. Heat dissipation holes are provided on both the front and rear doors. The host interface, backup interface, and antenna interface are all connected to a first feed tube via a coaxial converter.

[0007] The aforementioned broadcast transmitter switching device includes a resistor frame comprising a first insulating support plate and a second insulating support plate arranged in parallel, as well as a third insulating support plate and a fourth insulating support plate arranged in parallel. A first conductive connecting strip is connected between one end of the first insulating support plate and one end of the third insulating support plate; a second conductive connecting strip is connected between the other ends of the first and third insulating support plates; a third conductive connecting strip is connected between one end of the second and fourth insulating support plates; a fourth conductive connecting strip is connected between the other ends of the second and fourth insulating support plates; a first conductive strip assembly and a second conductive strip assembly are connected between the first and third conductive connecting strips; and the second conductive connecting strip and the fourth conductive strip assembly are connected together. A third conductive strip assembly and a fourth conductive strip assembly are connected between the conductive connecting strips. A first insulating connecting plate and a second insulating connecting plate are vertically connected to the first insulating support plate. A third insulating connecting plate and a fourth insulating connecting plate are vertically connected to the second insulating support plate. The first, second, third, and fourth insulating connecting plates are all connected to the cabinet bottom plate through a first bend. A fifth and a sixth insulating connecting plate are vertically connected to the third insulating support plate. A seventh and an eighth insulating connecting plate are vertically connected to the fourth insulating support plate. The fifth, sixth, seventh, and eighth insulating connecting plates are all connected to the first partition plate through a second bend.

[0008] The aforementioned broadcast transmitter switching device includes a first conductive strip assembly comprising a first conductive strip, a second conductive strip, a third conductive strip, a fourth conductive strip, and a fifth conductive strip arranged in parallel from top to bottom. One end of each of the first, second, third, fourth, and fifth conductive strips is connected to a first conductive connecting strip. The other ends of each of the first, second, third, fourth, and fifth conductive strips are connected to a third conductive connecting strip. Copper strips are provided on the upper parts of the first, second, third, fourth, and fifth conductive strips.

[0009] In the aforementioned broadcast transmitter switching device, the mechanical structures of the second, third, and fourth conductive strip assemblies are all the same as those of the first conductive strip assembly. The first resistor is connected between the first and third conductive strip assemblies, and the second resistor is connected between the second and fourth conductive strip assemblies. The first and second resistors are arranged side by side and connected in parallel through a resistor frame to form a dummy load. A second feed tube is connected between the dummy load and the coaxial converter.

[0010] The aforementioned broadcast transmitter switching device includes an external interface board with circuit external interfaces, comprising a main unit high-voltage interlock interface XS1, a backup unit high-voltage interlock interface XS2, a main unit antenna arrival interlock interface XS3, a backup unit antenna arrival interlock interface XS4, a main unit dummy load interlock interface XS5, a backup unit dummy load interlock interface XS6, a main / backup unit switching automatic control interface XS7, a status display interface XS8, and a main / backup unit dummy load automatic control interface XS9; the main unit high-voltage interlock interface XS1... The high-voltage interlock interface XS1 includes XS1:1, XS1:2, and XS1:3; the standby high-voltage interlock interface XS2 includes XS2:1, XS2:2, and XS2:3; the main unit antenna positioning interlock interface XS3 includes XS3:1, XS3:2, and XS3:3; the standby unit antenna positioning interlock interface XS4 includes XS4:1, XS4:2, and XS4:3; and the main unit dummy load interlock interface XS5 includes XS5:1, XS5:2, and XS5:3. The standby dummy load interlocking interface XS6 includes XS6:1, XS6:2, and XS6:3; the master / standby switchover automatic control interface XS7 includes XS7:1, XS7:2, and XS7:3; the status display interface XS8 includes XS8:1, XS8:2, XS8:3, XS8:4, and XS8:5; and the master / standby dummy load automatic control interface XS9 includes XS9:1, XS9:2, and XS9:3. The switches include an external power supply switch SA1, a control mode switch SA2, an internal control selection switch SA3, and a dummy load power switch SA6. The indicator lights include master-to-antenna indicator lights HL1-HL4, master-to-dummy load indicator lights HL5-HL8, standby-antenna indicator lights HL9-HL12, and standby-dummy load indicator lights HL13-HL16, as well as master switchover indicator lights HL17, standby switchover indicator lights HL18, antenna switchover indicator lights HL19, and dummy load switchover indicator lights HL20.

[0011] The aforementioned broadcast transmitter switching device includes a high-voltage interlock switch SA4 and an antenna positioning interlock switch SA5 on the emergency support; and a temperature sensor ST1 on the over-temperature protection support.

[0012] The aforementioned broadcast transmitter switching device includes a control unit comprising a main control circuit, a main unit interlocking circuit, a backup unit interlocking circuit, an emergency interlocking circuit, a dummy load control circuit, a dummy load interlocking circuit, and an indicator light control circuit. The main control circuit includes a fuse FU1, a 24V switching power supply E1, DC relays KA1, KA2, KA3, KA4, KA7, and KA8, and a coaxial converter terminal block TXP5. One terminal of the external power supply switch SA1 is the XT1:1 input terminal of the main control circuit and is connected to the L line of the external AC220V power supply. The other terminal of the external power supply switch SA1 is the XT1:1 input terminal of the main control circuit. The circuit has two input terminals: 1:2, connected to the neutral (N) line of the external AC220V power supply; 1 terminal of fuse FU1, connected to terminal 1a of the external power supply switch SA1; 2 terminal of fuse FU1, connected to the low (L) line of the 24V switching power supply E1, and connected to AC220V power supply L line terminals XT1:3 and XT1:4; 2a terminal of the external power supply switch SA1, connected to the neutral (N) line of the 24V switching power supply E1, and connected to AC220V power supply N line terminals XT1:5 and XT1:6; 1 terminal of terminal TXP5, connected to the L line of the 24V switching power supply E1; 2 terminal of terminal TXP5, connected to the normally open contact 6 of the DC relay KA1; and 3 terminal of terminal TXP5, connected to the DC relay... The normally open contact 6 of KA2 is connected to the N, COM, and V- terminals of the 24V switching power supply E1, as well as the normally open contacts 7 of DC relays KA1 and KA2, which are all grounded. Terminals 4 and 6 of the terminal block TXP5 are connected to the V- terminal of the 24V switching power supply E1, which is also the DC 0V power supply terminals XT1:7 and XT1:8. Terminal 5 of the terminal block TXP5 is connected to the normally closed contact 1 of DC relay KA8. The normally closed contact 4 of DC relay KA8 is connected to the coil terminals 2 of both DC relay KA3 and KA7. Terminal 7 of the terminal block TXP5 is connected to the normally closed contact 1 of DC relay KA7. The normally closed contact 1 is connected. The normally closed contact 4 of the DC relay KA7 is connected to the coil terminal 2 of both the DC relay KA4 and the DC relay KA8. The coil terminals 10 of the DC relays KA3, KA7, KA4, and KA7 are all connected to the V+ terminal of the 24V switching power supply E1. The V+ terminal of the 24V switching power supply E1 is the DC24V power supply terminal XT1:9 and XT1:10. Terminals 3 and 4 of the control mode switching switch SA2 are connected to the V- terminal of the 24V switching power supply E1. Terminal 3a of the control mode switching switch SA2 is connected to the main / standby machine switching automatic control interface XS7:3.Terminals 3 and 4 of the internal control switching selection switch SA3 are both connected to terminal 4a of the control mode switching switch SA2. Terminal 4a of the internal control switching selection switch SA3 is connected to the normally closed contact 1 of the DC relay KA2 and to the main / standby machine switching automatic control interface XS7:1. The normally closed contact 4 of the DC relay KA2 is connected to the coil terminal 2 of the DC relay KA1. Terminal 3a of the internal control switching selection switch SA3 is connected to the normally closed contact 1 of the DC relay KA1 and to the main / standby machine switching automatic control interface XS7:2. The normally closed contact 4 of the DC relay KA1 is connected to the coil terminal 2 of the DC relay KA2. The coil terminals 10 of the DC relay KA1 and the coil terminals 10 of the DC relay KA2 are also connected. All are connected to the V+ terminal of the 24V switching power supply E1; the host interlocking circuit includes a host high-voltage interlocking circuit and a host antenna positioning interlocking circuit. In the host high-voltage interlocking circuit, contact 1 of the DC relay KA3 is connected to both the host high-voltage interlocking interface XS1:1 and the host dummy load interlocking interface XS5:1, and contact 3 of the DC relay KA3 is connected to both the host high-voltage interlocking interface XS1:2 and the host dummy load interlocking interface XS5:2. In the host antenna positioning interlocking circuit, contact 11 of the DC relay KA3 is connected to the host antenna positioning interlocking interface XS3:1, and contact 9 of the DC relay KA3 is connected to the host antenna positioning interlocking interface XS3:2; the standby interlocking circuit... The circuit includes a standby high-voltage interlock circuit and a standby antenna positioning interlock circuit. In the standby high-voltage interlock circuit, contact 1 of the DC relay KA4 is connected to both the standby high-voltage interlock interface XS2:1 and the standby dummy load interlock interface XS6:1, and contact 3 of the DC relay KA4 is connected to both the standby high-voltage interlock interface XS2:2 and the standby dummy load interlock interface XS6:2. In the standby antenna positioning interlock circuit, contact 11 of the DC relay KA4 is connected to the standby antenna positioning interlock interface XS4:1, and contact 9 of the DC relay KA4 is connected to the standby antenna positioning interlock interface XS4:2. The emergency interlock circuit includes a high-voltage emergency interlock circuit and an antenna positioning emergency interlock circuit. In the high-voltage emergency interlocking circuit, terminal 3 of the high-voltage interlocking switch SA4 is connected to contact 1 of the DC relay KA4, terminal 3a of the high-voltage interlocking switch SA4 is connected to contact 3 of the DC relay KA3, terminal 4 of the high-voltage interlocking switch SA4 is connected to contact 3 of the DC relay KA4, and terminal 4a of the high-voltage interlocking switch SA4 is connected to contact 1 of the DC relay KA3. The dummy load control circuit includes a DC relay KA5, an AC relay KA6, a fuse FU2, and a fuse FU3. Terminal 2 of the coil of the DC relay KA5 is connected to the DC 24V power supply terminal XT1:9, and terminal 10 of the coil of the DC relay KA5 is connected to the main / standby dummy load self-control interface XS9:1.The main / standby dummy load self-control interface XS9:2 is connected to the DC 0V power supply terminal XT1:7. The normally open contact 1 of the DC relay KA5 and terminal 1 of the dummy load power switch SA6 are both connected to the AC 220V power supply L line terminal XT1:3. The normally open contact 3 of the DC relay KA5, the coil terminal 2 of the AC relay KA6, terminal 1 of fuse FU2, and terminal 1 of fuse FU3 are all connected to terminal 1a of the dummy load power switch SA6. The coil terminal 10 of the AC relay KA6 is connected to terminal 1 of the temperature sensor ST1. Terminal 2 of fuse FU2 is connected to terminal 1 of the first fan. Terminal 2 of fuse FU3 is connected to terminal 1 of the second fan. The normally open contact 6 of the DC relay KA5 and terminals 2 of the dummy load power switch SA6 are both connected to the AC 220V power supply N line terminal XT1:5. The normally open contact 6 of the DC relay KA5... 7. Terminals 2 of temperature sensor ST1, terminals 2 of the first fan, and terminals 2 of the second fan are all connected to terminal 2a of dummy load power switch SA6. The dummy load interlocking circuit includes a main unit dummy load interlocking circuit and a standby unit dummy load interlocking circuit. In the main unit dummy load interlocking circuit, contact 1 of AC relay KA6 is connected to both the main unit high-voltage interlocking interface XS1:1 and the main unit dummy load interlocking interface XS5:1, and normally closed contact 11 of DC relay KA7 is connected to both the main unit high-voltage interlocking interface XS1:2 and the main unit dummy load interlocking interface XS5:2. In the standby unit dummy load interlocking circuit, contact 6 of AC relay KA6 is connected to both the standby unit high-voltage interlocking interface XS2:1 and the standby unit dummy load interlocking interface XS6:1, and normally closed contact 11 of DC relay KA8 is connected to both the standby unit high-voltage interlocking interface XS2:2 and the standby unit dummy load interlocking interface XS6:2.

[0013] The present invention also discloses a switching method for a broadcast transmitter switching device, which uses the above-mentioned switching device. The switching method includes a manual switching method, an automatic switching method, an emergency switching method, and an over-temperature automatic protection method.

[0014] The specific process of the manual switching method includes: connecting external AC220V power through XT1:1 and XT1:2, turning on the external power supply switch SA1, energizing the 24V switching power supply E1 through the fuse FU1, outputting DC +24V voltage, and keeping the main unit switching indicator HL17, standby unit switching indicator HL18, antenna switching indicator HL19 and dummy load switching indicator HL20 constantly lit.

[0015] Main Unit Switching: Control mode switching switch SA2 switches the connection between terminal 4 and terminal 4a. Simultaneously, internal control switching selection switch SA3 switches the connection between terminal 4 and terminal 4a. The normally closed contacts 1 and 4 of DC relay KA2 are closed, the coil of DC relay KA1 is energized, and the normally open contacts 6 and 7 of DC relay KA1 are closed. Terminals 1 and 2 of the coaxial converter's wiring terminal TXP5 are connected to AC220V. The AC motor inside the coaxial converter rotates clockwise, and the internal blades are switched to the main unit position. At the same time, the normally closed contacts 1 and 4 of DC relay KA1 are open, the coil of DC relay KA2 is de-energized, and the normally open contacts 6 and 7 of DC relay KA2 remain open. Terminal 3 of the coaxial converter's wiring terminal TXP5 is not powered and does not switch.

[0016] At this time, the transmitter status is as follows: the main unit is in the antenna position, the standby unit is in the dummy load position, the normally closed contacts 1 and 4 of DC relay KA8 are closed, the coils of DC relay KA3 and DC relay KA7 are energized, the normally closed contacts 1 and 4 of DC relay KA7 are open, and the coils of DC relay KA4 and DC relay KA8 are de-energized; at the same time, the normally open contacts 1 and 3 and normally open contacts 9 and 11 of DC relay KA3 are closed, the main unit high voltage interlock is engaged, and the main unit antenna is in position interlock.

[0017] Standby switchover: Control mode switch SA2 remains connected between terminals 4 and 4a. Simultaneously, internal control switch SA3 connects terminals 3 and 3a. The normally closed contacts 1 and 4 of DC relay KA1 are closed, the coil of DC relay KA2 is energized, and the normally open contacts 6 and 7 of DC relay KA2 are closed. Terminals 1 and 3 of the coaxial converter's TXP5 are connected to AC220V. The AC motor inside the coaxial converter rotates counterclockwise, and the internal blades are switched to the standby position. Simultaneously, the normally closed contacts 1 and 4 of DC relay KA2 are open, the coil of DC relay KA1 is de-energized, and the normally open contacts 6 and 7 of DC relay KA1 remain open. Terminal 2 of the coaxial converter's TXP5 is not powered and does not switch.

[0018] At this time, the transmitter status is as follows: the standby transmitter is in the antenna position, the main transmitter is in the dummy load position, the normally closed contacts 1 and 4 of DC relay KA7 are closed, the coils of DC relay KA4 and DC relay KA8 are energized, the normally closed contacts 1 and 4 of DC relay KA8 are open, and the coils of DC relay KA3 and DC relay KA7 are de-energized; at the same time, the normally open contacts 1 and 3 and normally open contacts 9 and 11 of DC relay KA4 are closed, the standby transmitter high voltage interlock is activated, and the standby transmitter antenna is in position interlock.

[0019] The specific process of the automatic switching method includes: switching the control mode switching switch SA2 to connect terminal 3 and terminal 3a. The principle of master switching and standby switching in the automatic switching method is the same as that of the manual switching method. Automatic switching is performed by connecting an external controller through the master / standby switching automatic control interface XS7.

[0020] XS7:1 is the main control interface, XS7:2 is the standby control interface, and XS7:3 is the common DC0V low-level terminal of the control interfaces for pins 1 and 2. When the external controller controls XS7:1 and XS7:3 to be shorted, it is used to control and switch the main unit; when the external controller controls XS7:2 and XS7:3 to be shorted, it is used to control and switch the standby unit.

[0021] When the external controller short-circuits XS9:1 and XS9:2 in the dummy load self-control interface XS9 of the main and standby units, the coil of DC relay KA5 is energized, and the normally open contacts 1, 3 and 6, 7 of DC relay KA5 are closed; at the same time, when the dummy load power switch SA6 is pressed, the first and second fans start to work and blow air for heat dissipation. Temperature sensor ST1 is normally closed under overheating conditions, and the coil of AC relay KA6 is energized, so that the main unit or standby unit is interlocked in place.

[0022] The specific process of the emergency switching method includes:

[0023] Transmitter switching: Switch both the control mode switching switch SA2 and the internal control switching selection switch SA3 to the middle position (zero). Open the front door and manually operate the handle on the coaxial converter to switch between the main unit and the standby unit.

[0024] Emergency interlocks include high-voltage emergency interlocks for the main unit and the standby unit, as well as antenna positioning emergency interlocks for the main unit and the standby unit. When any interlock circuit fails, emergency interlocks are performed through the high-voltage interlock switch SA4 and the antenna positioning interlock switch SA5.

[0025] The specific process of the over-temperature automatic protection method includes: the temperature sensor ST1 is normally closed under over-temperature conditions. When the dummy load resistor overheats, causing the outlet temperature to be too high and reaching the over-temperature action point of 60°C for the temperature sensor ST1, the normally closed point of the temperature sensor ST1 opens, the coil of the AC relay KA6 is de-energized, the interlock is broken, and the transmitter loses high voltage. When the temperature drops below 60°C, the normally closed point of the temperature sensor ST1 returns to the closed state.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. This invention effectively switches the working states of the main unit, backup unit, antenna, and dummy load through a coaxial converter. The product design is highly integrated and aesthetically pleasing. Its external dimensions match the transmitter and are placed between two transmitters, making the equipment room layout reasonable and tidy.

[0028] 2. The present invention can achieve three types of control—manual, automatic, and emergency switching—through logic circuit programming. It has complete circuit signal sampling and protection functions. From the working principle to the display of each status, it can fully realize intelligent networking and docking with the host computer, achieving unattended operation.

[0029] 3. This invention has fewer circuit connections to external devices, effectively ensuring the accuracy and correctness of control interlocks and reducing the downtime rate of transmitters.

[0030] 4. This invention features emergency switching and interlocking. When some components in the circuit fail or the power supply to the switching cabinet is interrupted due to long-term use, the emergency switching and interlocking can enable normal switching between the main and backup transmitters, antennas, and dummy loads, allowing the transmitter to work normally and ensuring uninterrupted broadcasting.

[0031] 5. The resistor frame design in the dummy load of this invention is original. Traditional top and bottom air blowing can easily cause the upper control components in the cabinet to overheat, which seriously affects the transmitter switching effect. Now it is changed to front and rear air blowing for cooling, with an over-temperature protection device. The product layout is more reasonable, which greatly improves the efficiency and accuracy of transmitter debugging and maintenance.

[0032] 6. This invention can be effectively applied to the switching of broadcast transmitters. Combined with the switching method, it can achieve stable and efficient switching between the main unit, backup unit, antenna and dummy load. It has stable and reliable performance, good use effect, broad market prospects and is easy to promote and use.

[0033] In summary, this invention has a simple structure and complete functions, and can be effectively applied to the switching of broadcast transmitters. Combined with the switching method, it can achieve stable and efficient switching between the main unit, backup unit, antenna, and dummy load. It has stable and reliable performance, good usage effect, broad market prospects, and is easy to promote and use.

[0034] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the switching device of the present invention;

[0036] Figure 2 for Figure 1 Rear view;

[0037] Figure 3 This is a layout diagram of the top, front door, and rear door of the cabinet of the present invention;

[0038] Figure 4 This is a schematic diagram of the resistive element skeleton of the present invention;

[0039] Figure 5 This is a schematic diagram of the installation of the first and second resistors on the resistor frame of the present invention;

[0040] Figure 6 This is a circuit schematic diagram of the external interface of the circuit of the present invention;

[0041] Figure 7 This is a circuit diagram of the main control circuit of the present invention;

[0042] Figure 8 This is a circuit diagram of the host interlocking circuit of the present invention;

[0043] Figure 9 This is a circuit diagram of the standby interlocking circuit of the present invention;

[0044] Figure 10 This is a circuit diagram of the emergency interlocking circuit of the present invention;

[0045] Figure 11 This is a circuit diagram of the dummy load control circuit of the present invention;

[0046] Figure 12 This is a circuit diagram of the dummy load interlocking circuit of the present invention;

[0047] Figure 13 This is a circuit diagram of the indicator light control circuit of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1—Cabinet body; 2—Resistor frame; 2-1—First insulating support plate;

[0050] 2-2—Second insulating support plate; 2-3—Third insulating support plate; 2-4—Fourth insulating support plate;

[0051] 2-5—First conductive connecting strip; 2-6—Second conductive connecting strip; 2-7—Third conductive connecting strip;

[0052] 2-8—Fourth conductive connecting strip; 2-9—First conductive strip assembly; 2-91—First conductive strip;

[0053] 2-92—Second conductive strip; 2-93—Third conductive strip; 2-94—Fourth conductive strip;

[0054] 2-95—Fifth conductive strip; 2-96—Copper strip; 2-10—Second conductive strip assembly;

[0055] 2-11—Third conductive strip assembly; 2-12—Fourth conductive strip assembly; 2-13—First insulating connecting plate;

[0056] 2-14—Second insulating connecting plate; 2-15—Third insulating connecting plate; 2-16—Fourth insulating connecting plate;

[0057] 2-17—First bend; 2-18—Fifth insulating connecting plate; 2-19—Sixth insulating connecting plate;

[0058] 2-20—Seventh Insulation Connector Plate; 2-21—Eighth Insulation Connector Plate; 2-22—Second Bend;

[0059] 3—Wind turbine support; 4—First resistor element; 5—Second resistor element;

[0060] 6—First fan; 7—Second fan; 8—First partition;

[0061] 9—External interface board; 10—Second partition; 11—Coaxial converter;

[0062] 12—Emergency support; 13—Front door; 14—Rear door;

[0063] 15—Switch; 16—Indicator light; 17—High-frequency power meter;

[0064] 18—Main unit interface; 19—Backup unit interface; 20—Antenna interface;

[0065] 21—Heat dissipation hole; 22—Over-temperature protection bracket; 23—First feed pipe;

[0066] 24—Second feed tube. Detailed Implementation

[0067] like Figures 1-3As shown, the broadcast transmitter switching device of the present invention includes a mechanical carrier and a control unit; the mechanical carrier includes a cabinet 1, the lower part of which is provided with a resistor frame 2 and a fan bracket 3 located on one side of the resistor frame 2; a first resistor 4 and a second resistor 5 are provided on the resistor frame 2; a first fan 6 for blowing air to cool the first resistor 4 and a second fan 7 for blowing air to cool the second resistor 5 are provided on the fan bracket 3; a first partition 8 for mounting the control unit is provided on the upper part of the resistor frame 2. The cabinet 1 is equipped with an external interface board 9 and an over-temperature protection bracket 22. Inside the cabinet 1, a second partition 10 is located above the first partition 8. A coaxial converter 11 is located on the upper part of the second partition 10, and an emergency bracket 12 is located on the lower part of the second partition 10. The cabinet 1 is equipped with a front door 13 and a rear door 14. A switch 15, an indicator light 16, and a high-frequency power meter 17 are provided on the front door 13 panel. The fan bracket 3 is located inside the front door 13. The external interface board 9, the emergency bracket 12, and the over-temperature protection bracket 22 are all located inside the rear door 14.

[0068] In specific implementation, the interior of the cabinet 1 is divided into three parts from bottom to top by the first partition 8 and the second partition 10. The lower part is equipped with the first resistor 4 and the second resistor 5 through the resistor frame 2, which serve as a dummy load for the switching device. The high-frequency power meter 17 on the front door 13 panel is used to indicate the input power of the dummy load. The middle part is equipped with the control unit for radio frequency switching and dummy load power configuration on the first partition 8. The upper part is equipped with the coaxial converter 11 for performing the switching action on the second partition 10.

[0069] In practice, the first fan 6 and the second fan 7 blow air in the front and back directions for forced cooling, avoiding the heat generation of the upper control components in the cabinet that is easily caused by traditional top and bottom air blowing, and enhancing the switching effect of the broadcast transmitter.

[0070] In this embodiment, the cabinet 1 is made of aluminum alloy plate, and the external dimensions of the cabinet 1 are: 600mm wide × 836mm deep × 1980mm high.

[0071] In practice, cabinet 1 is made of aluminum alloy plate, which has good shielding performance and anti-interference ability. The external dimensions of cabinet 1 are designed to be the same as those of the transmitter. The cabinet 1 of the switching device is placed between the main unit and the backup unit, so that the layout of the equipment room is reasonable, neat and beautiful.

[0072] In this embodiment, as Figure 3 As shown, the top of the cabinet 1 is provided with a main unit interface 18, a standby unit interface 19, and an antenna interface 20. Both the front door 13 and the rear door 14 are provided with ventilation holes 21. Figure 2As shown, the host interface 18, the standby interface 19 and the antenna interface 20 are all connected to the coaxial converter 11 via a first feed tube 23.

[0073] In specific implementation, the first feed tube 23 adopts a φ40 copper feed tube, and the antenna interface 20 and the coaxial converter 11 can be directly connected through the φ40 copper feed tube, which innovates the old single external connection mode; it can also be connected through underground trenches.

[0074] In this embodiment, as Figure 4 As shown, the resistor frame 2 includes a first insulating support plate 2-1 and a second insulating support plate 2-2 arranged in parallel, and a third insulating support plate 2-3 and a fourth insulating support plate 2-4 arranged in parallel. A first conductive connecting strip 2-5 is connected between one end of the first insulating support plate 2-1 and one end of the third insulating support plate 2-3; a second conductive connecting strip 2-6 is connected between the other end of the first insulating support plate 2-1 and the other end of the third insulating support plate 2-3; a third conductive connecting strip 2-7 is connected between one end of the second insulating support plate 2-2 and one end of the fourth insulating support plate 2-4; a fourth conductive connecting strip 2-8 is connected between the other end of the second insulating support plate 2-2 and the other end of the fourth insulating support plate 2-4; a first conductive strip assembly 2-9 and a second conductive strip assembly 2-10 are connected between the first conductive connecting strip 2-5 and the third conductive connecting strip 2-7; and a third conductive strip assembly 2-10 is connected between the second conductive connecting strip 2-6 and the fourth conductive connecting strip 2-8. 11 and the fourth conductive strip assembly 2-12, the first insulating support plate 2-1 is connected to the vertically arranged first insulating connecting plate 2-13 and second insulating connecting plate 2-14, the second insulating support plate 2-2 is connected to the vertically arranged third insulating connecting plate 2-15 and fourth insulating connecting plate 2-16, the first insulating connecting plate 2-13, the second insulating connecting plate 2-14, the third insulating connecting plate 2-15 and the fourth insulating connecting plate 2-16 are all connected to the bottom plate of the cabinet 1 through the first bend 2-17, the third insulating support plate 2-3 is connected to the vertically arranged fifth insulating connecting plate 2-18 and sixth insulating connecting plate 2-19, the fourth insulating support plate 2-4 is connected to the vertically arranged seventh insulating connecting plate 2-20 and eighth insulating connecting plate 2-21, the fifth insulating connecting plate 2-18, the sixth insulating connecting plate 2-19, the seventh insulating connecting plate 2-20 and the eighth insulating connecting plate 2-21 are all connected to the first partition plate 8 through the second bend 2-22.

[0075] In specific implementation, the first insulating support plate 2-1, the second insulating support plate 2-2, the third insulating support plate 2-3, the fourth insulating support plate 2-4, the first insulating connecting plate 2-13, the second insulating connecting plate 2-14, the third insulating connecting plate 2-15, the fourth insulating connecting plate 2-16, the fifth insulating connecting plate 2-18, the sixth insulating connecting plate 2-19, the seventh insulating connecting plate 2-20, and the eighth insulating connecting plate 2-21 are all made of epoxy phenolic glass cloth, and the first conductive connecting strip 2-5, the second conductive connecting strip 2-6, the third conductive connecting strip 2-7, and the fourth conductive connecting strip 2-8 are all made of aluminum plate or copper plate.

[0076] In this embodiment, as Figure 5 As shown, the first conductive strip assembly 2-9 includes a first conductive strip 2-91, a second conductive strip 2-92, a third conductive strip 2-93, a fourth conductive strip 2-94, and a fifth conductive strip 2-95 arranged in parallel from top to bottom. One end of the first conductive strip 2-91, one end of the second conductive strip 2-92, one end of the third conductive strip 2-93, one end of the fourth conductive strip 2-94, and one end of the fifth conductive strip 2-95 are all connected to the first conductive connecting strip 2-5. The other end of the first conductive strip 2-91, the second conductive strip 2-92, the third conductive strip 2-93, the fourth conductive strip 2-94, and the fifth conductive strip 2-95 are all connected to the third conductive connecting strip 2-7. A copper strip 2-96 is provided on the upper part of the first conductive strip 2-91, the upper part of the second conductive strip 2-92, the upper part of the third conductive strip 2-93, the upper part of the fourth conductive strip 2-94, and the upper part of the fifth conductive strip 2-95.

[0077] In specific implementation, the first conductive strip 2-91, the second conductive strip 2-92, the third conductive strip 2-93, the fourth conductive strip 2-94, and the fifth conductive strip 2-95 are all made of aluminum or copper.

[0078] In this embodiment, as Figure 5 As shown, the mechanical structures of the second conductive strip assembly 2-10, the third conductive strip assembly 2-11, and the fourth conductive strip assembly 2-12 are all the same as the mechanical structure of the first conductive strip assembly 2-9. The first resistor 4 is connected between the first conductive strip assembly 2-9 and the third conductive strip assembly 2-11, and the second resistor 5 is connected between the second conductive strip assembly 2-10 and the fourth conductive strip assembly 2-12. The first resistor 4 and the second resistor 5 are arranged side by side, connected in parallel through the resistor frame 2, forming a dummy load. Figure 2 As shown, a second feed tube 24 is connected between the dummy load and the coaxial converter 11.

[0079] In practice, the second feed tube 24 is a φ40 copper feed tube.

[0080] In this embodiment, the external interface board 9 is provided with a circuit external interface, such as... Figure 6 As shown, the external interfaces of the circuit include a main unit high-voltage interlock interface XS1, a standby unit high-voltage interlock interface XS2, a main unit antenna arrival interlock interface XS3, a standby unit antenna arrival interlock interface XS4, a main unit dummy load interlock interface XS5, a standby unit dummy load interlock interface XS6, a main / standby unit switching automatic control interface XS7, a status display interface XS8, and a main / standby unit dummy load automatic control interface XS9; the main unit high-voltage interlock interface XS1 includes XS1:1, XS1:2, and XS1:3; the standby unit high-voltage interlock interface XS2 includes XS2:1, XS2:2, and XS2:3; the main unit antenna arrival interlock interface XS3 includes XS3:1, XS3:2, and XS3:3; and the standby unit antenna arrival interlock interface XS4 includes XS4: 1. XS4:2 and XS4:3, the host dummy load interlocking interface XS5 includes XS5:1, XS5:2 and XS5:3, the standby dummy load interlocking interface XS6 includes XS6:1, XS6:2 and XS6:3, the host / standby switchover control interface XS7 includes XS7:1, XS7:2 and XS7:3, the status display interface XS8 includes XS8:1, XS8:2, XS8:3, XS8:4 and XS8:5, the host / standby dummy load control interface XS9 includes XS9:1, XS9:2 and XS9:3; the switch 15 includes an external power supply switch SA1, a control mode switching switch SA2, an internal control switching selection switch SA3 and a dummy load power switch SA6; as Figure 13 As shown, the indicator lights 16 include host to antenna indicator lights HL1~HL4, host to dummy load indicator lights HL5~HL8, standby to antenna indicator lights HL9~HL12 and standby to dummy load indicator lights HL13~HL16, as well as host switching indicator lights HL17, standby switching indicator lights HL18, antenna switching indicator lights HL19 and dummy load switching indicator lights HL20.

[0081] In this embodiment, the emergency support 12 is equipped with a high-voltage interlock switch SA4 and an antenna positioning interlock switch SA5; the over-temperature protection support 22 is equipped with a temperature sensor ST1.

[0082] In this embodiment, the control and control unit includes a main control circuit, a main unit interlocking circuit, a standby unit interlocking circuit, an emergency interlocking circuit, a dummy load control circuit, a dummy load interlocking circuit, and an indicator light control circuit; such as Figure 7As shown, the main control circuit includes fuse FU1, a 24V switching power supply E1, DC relays KA1, KA2, KA3, KA4, KA7, and KA8, and the terminal block TXP5 of the coaxial converter 11; one end of the external power supply switch SA1 is the XT1:1 input terminal of the main control circuit and is connected to the L line of the external AC220V power supply; the other end of the external power supply switch SA1 is the XT1:2 input terminal of the main control circuit and is connected to the N line of the external AC220V power supply; one end of fuse FU1 is connected to the 1a end of the external power supply switch SA1; and the other end of fuse FU1 is connected to the 24V switching power supply E1. The L terminal of power source E1 is connected, and the AC220V power supply L line terminals XT1:3 and XT1:4 are also connected. The 2a terminal of the external power supply switch SA1 is connected to the N terminal of the 24V switching power supply E1, and the AC220V power supply N line terminals XT1:5 and XT1:6 are also connected. Terminal 1 of terminal TXP5 is connected to the L terminal of the 24V switching power supply E1. Terminal 2 of terminal TXP5 is connected to the normally open contact 6 of DC relay KA1. Terminal 3 of terminal TXP5 is connected to the normally open contact 6 of DC relay KA2. The N terminal, COM terminal, and V- terminal of the 24V switching power supply E1, as well as the normally open contacts 7 of DC relays KA1 and KA2, are all grounded. Terminals 4 and 6 of the TXP5 terminal block are both connected to the V- terminal of the 24V switching power supply E1, and the V- terminal of the 24V switching power supply E1 is the DC 0V power supply terminal block XT1:7 and XT1:8. Terminal 5 of the TXP5 terminal block is connected to the normally closed contact 1 of the DC relay KA8. The normally closed contact 4 of the DC relay KA8 is connected to the coil terminal 2 of both the DC relay KA3 and the DC relay KA7. Terminal 7 of the TXP5 terminal block is connected to the normally closed contact 1 of the DC relay KA7. The normally closed contact 4 of the DC relay KA7 is connected to the coil terminal 2 of both the DC relay KA4 and the DC relay KA8. The coil terminal 10 of the DC relay KA3... The coil terminals 10 of DC relay KA7, DC relay KA4, and DC relay KA7 are all connected to the V+ terminal of the 24V switching power supply E1. The V+ terminal of the 24V switching power supply E1 is the DC24V power supply terminal XT1:9 and XT1:10. Terminals 3 and 4 of the control mode switching switch SA2 are both connected to the V- terminal of the 24V switching power supply E1. Terminal 3a of the control mode switching switch SA2 is connected to the main / standby machine switching automatic control interface XS7:3. Terminals 3 and 4 of the internal control switching selection switch SA3 are both connected to terminal 4a of the control mode switching switch SA2. Terminal 4a of the internal control switching selection switch SA3 is connected to the normally closed contact 1 of the DC relay KA2.It is connected to the main / standby machine switching automatic control interface XS7:1. The normally closed contact 4 of the DC relay KA2 is connected to the coil terminal 2 of the DC relay KA1. The 3a terminal of the internal control switching selection switch SA3 is connected to the normally closed contact 1 of the DC relay KA1, and is also connected to the main / standby machine switching automatic control interface XS7:2. The normally closed contact 4 of the DC relay KA1 is connected to the coil terminal 2 of the DC relay KA2. The coil terminals 10 of both the DC relay KA1 and the DC relay KA2 are connected to the V+ terminal of the 24V switching power supply E1. Figure 8 As shown, the host interlocking circuit includes a host high-voltage interlocking circuit and a host antenna positioning interlocking circuit. In the host high-voltage interlocking circuit, contact 1 of the DC relay KA3 is connected to both the host high-voltage interlocking interface XS1:1 and the host dummy load interlocking interface XS5:1, and contact 3 of the DC relay KA3 is connected to both the host high-voltage interlocking interface XS1:2 and the host dummy load interlocking interface XS5:2. In the host antenna positioning interlocking circuit, contact 11 of the DC relay KA3 is connected to the host antenna positioning interlocking interface XS3:1, and contact 9 of the DC relay KA3 is connected to the host antenna positioning interlocking interface XS3:2. Figure 9 As shown, the standby interlocking circuit includes a standby high-voltage interlocking circuit and a standby antenna positioning interlocking circuit. In the standby high-voltage interlocking circuit, contact 1 of the DC relay KA4 is connected to both the standby high-voltage interlocking interface XS2:1 and the standby dummy load interlocking interface XS6:1, and contact 3 of the DC relay KA4 is connected to both the standby high-voltage interlocking interface XS2:2 and the standby dummy load interlocking interface XS6:2. In the standby antenna positioning interlocking circuit, contact 11 of the DC relay KA4 is connected to the standby antenna positioning interlocking interface XS4:1, and contact 9 of the DC relay KA4 is connected to the standby antenna positioning interlocking interface XS4:2. Figure 10 As shown, the emergency interlocking circuit includes a high-voltage emergency interlocking circuit and an antenna positioning emergency interlocking circuit. In the high-voltage emergency interlocking circuit, terminal 3 of the high-voltage interlocking switch SA4 is connected to contact 1 of the DC relay KA4, terminal 3a of the high-voltage interlocking switch SA4 is connected to contact 3 of the DC relay KA3, terminal 4 of the high-voltage interlocking switch SA4 is connected to contact 3 of the DC relay KA4, and terminal 4a of the high-voltage interlocking switch SA4 is connected to contact 1 of the DC relay KA3. Figure 11As shown, the dummy load control circuit includes a DC relay KA5, an AC relay KA6, a fuse FU2, and a fuse FU3. The coil terminal 2 of the DC relay KA5 is connected to the DC 24V power supply terminal XT1:9. The coil terminal 10 of the DC relay KA5 is connected to the main / standby dummy load self-control interface XS9:1. The main / standby dummy load self-control interface XS9:2 is connected to the DC 0V power supply terminal XT1:7. The normally open contact 1 of the DC relay KA5 and terminal 1 of the dummy load power switch SA6 are both connected to the AC 220V power supply L line terminal XT1:3. The normally open contact 3 of the DC relay KA5 and the coil terminal 2 of the AC relay KA6... Terminals 1 of fuses FU2 and FU3 are both connected to terminal 1a of the dummy load power switch SA6. Terminal 10 of the AC relay KA6 is connected to terminal 1 of the temperature sensor ST1. Terminal 2 of fuse FU2 is connected to terminal 1 of the first fan 6. Terminal 2 of fuse FU3 is connected to terminal 1 of the second fan 7. The normally open contact 6 of the DC relay KA5 and terminals 2 of the dummy load power switch SA6 are both connected to the AC220V power supply N line terminal XT1:5. The normally open contact 7 of the DC relay KA5, terminals 2 of the temperature sensor ST1, terminals 2 of the first fan 6, and terminals 2 of the second fan 7 are all connected to terminal 2a of the dummy load power switch SA6. Figure 12 As shown, the dummy load interlocking circuit includes a main unit dummy load interlocking circuit and a standby unit dummy load interlocking circuit. In the main unit dummy load interlocking circuit, contact 1 of AC relay KA6 is connected to both the main unit high-voltage interlocking interface XS1:1 and the main unit dummy load interlocking interface XS5:1, and normally closed contact 11 of DC relay KA7 is connected to both the main unit high-voltage interlocking interface XS1:2 and the main unit dummy load interlocking interface XS5:2. In the standby unit dummy load interlocking circuit, contact 6 of AC relay KA6 is connected to both the standby unit high-voltage interlocking interface XS2:1 and the standby unit dummy load interlocking interface XS6:1, and normally closed contact 11 of DC relay KA8 is connected to both the standby unit high-voltage interlocking interface XS2:2 and the standby unit dummy load interlocking interface XS6:2.

[0083] The switching method of the broadcast transmitter switching device of the present invention includes a manual switching method, an automatic switching method, an emergency switching method, and an over-temperature automatic protection method;

[0084] The specific process of the manual switching method includes: connecting external AC220V power through XT1:1 and XT1:2, turning on the external power supply switch SA1, energizing the 24V switching power supply E1 through the fuse FU1, outputting DC +24V voltage, and keeping the main unit switching indicator HL17, standby unit switching indicator HL18, antenna switching indicator HL19 and dummy load switching indicator HL20 constantly lit.

[0085] Host Switching: Control mode switch SA2 switches the connection between terminal 4 and terminal 4a. Simultaneously, internal control selection switch SA3 switches the connection between terminal 4 and terminal 4a. The normally closed contacts 1 and 4 of DC relay KA2 are closed, the coil of DC relay KA1 is energized, and the normally open contacts 6 and 7 of DC relay KA1 are closed. Terminals 1 and 2 of coaxial converter 11 are connected to AC220V, and the AC motor inside coaxial converter 11 rotates clockwise, with the internal blades pointing towards the host position. At the same time, the normally closed contacts 1 and 4 of DC relay KA1 are open, the coil of DC relay KA2 is de-energized, and the normally open contacts 6 and 7 of DC relay KA2 remain open. Terminal 3 of coaxial converter 11 is not powered and does not switch.

[0086] At this time, the transmitter status is as follows: the main unit is in the antenna position, the standby unit is in the dummy load position, the normally closed contacts 1 and 4 of DC relay KA8 are closed, the coils of DC relay KA3 and DC relay KA7 are energized, the normally closed contacts 1 and 4 of DC relay KA7 are open, and the coils of DC relay KA4 and DC relay KA8 are de-energized; at the same time, the normally open contacts 1 and 3 and normally open contacts 9 and 11 of DC relay KA3 are closed, the main unit high voltage interlock is engaged, and the main unit antenna is in position interlock.

[0087] Standby switchover: Control mode switch SA2 remains connected between terminals 4 and 4a. Simultaneously, internal control switch SA3 connects terminals 3 and 3a. The normally closed contacts 1 and 4 of DC relay KA1 are closed, the coil of DC relay KA2 is energized, and the normally open contacts 6 and 7 of DC relay KA2 are closed. Terminals 1 and 3 of coaxial converter 11's TXP5 are connected to AC220V. The AC motor inside coaxial converter 11 rotates counterclockwise, and the internal blades are switched to the standby position. Simultaneously, the normally closed contacts 1 and 4 of DC relay KA2 are open, the coil of DC relay KA1 is de-energized, and the normally open contacts 6 and 7 of DC relay KA1 remain open. Terminal 2 of coaxial converter 11's TXP5 is not powered and does not switch.

[0088] At this time, the transmitter status is as follows: the standby transmitter is in the antenna position, the main transmitter is in the dummy load position, the normally closed contacts 1 and 4 of DC relay KA7 are closed, the coils of DC relay KA4 and DC relay KA8 are energized, the normally closed contacts 1 and 4 of DC relay KA8 are open, and the coils of DC relay KA3 and DC relay KA7 are de-energized; at the same time, the normally open contacts 1 and 3 and normally open contacts 9 and 11 of DC relay KA4 are closed, the standby transmitter high voltage interlock is activated, and the standby transmitter antenna is in position interlock.

[0089] The specific process of the automatic switching method includes: switching the control mode switching switch SA2 to connect terminal 3 and terminal 3a. The principle of master switching and standby switching in the automatic switching method is the same as that of the manual switching method. Automatic switching is performed by connecting an external controller through the master / standby switching automatic control interface XS7.

[0090] XS7:1 is the main control interface, XS7:2 is the standby control interface, and XS7:3 is the common DC0V low-level terminal of the control interfaces for pins 1 and 2. When the external controller controls XS7:1 and XS7:3 to be shorted, it is used to control and switch the main unit; when the external controller controls XS7:2 and XS7:3 to be shorted, it is used to control and switch the standby unit.

[0091] When the external controller short-circuits XS9:1 and XS9:2 in the dummy load self-control interface XS9 of the main and standby units, the coil of DC relay KA5 is energized, and the normally open contacts 1, 3 and 6, 7 of DC relay KA5 are closed; at the same time, when the dummy load power switch SA6 is pressed, the first fan 6 and the second fan 7 work to blow air for heat dissipation. The temperature sensor ST1 is normally closed under the condition of not overheating, and the coil of AC relay KA6 is energized, so that the main unit or standby unit is interlocked in place;

[0092] The specific process of the emergency switching method includes:

[0093] Transmitter switching: Switch both the control mode switching switch SA2 and the internal control switching selection switch SA3 to the middle position, open the front door 13, and manually operate the handle on the coaxial converter 11 to switch the main unit and standby unit working status.

[0094] Emergency interlocks include high-voltage emergency interlocks for the main unit and the standby unit, as well as antenna positioning emergency interlocks for the main unit and the standby unit. When any interlock circuit fails, emergency interlocks are performed through the high-voltage interlock switch SA4 and the antenna positioning interlock switch SA5.

[0095] The specific process of the over-temperature automatic protection method includes: the temperature sensor ST1 is normally closed under over-temperature conditions. When the dummy load resistor overheats, causing the outlet temperature to be too high and reaching the over-temperature action point of 60°C for the temperature sensor ST1, the normally closed point of the temperature sensor ST1 opens, the coil of the AC relay KA6 is de-energized, the interlock is broken, and the transmitter loses high voltage. When the temperature drops below 60°C, the normally closed point of the temperature sensor ST1 returns to the closed state.

[0096] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A broadcast transmitter switching device, characterized in that: The system includes a mechanical carrier and a control unit. The mechanical carrier includes a cabinet (1), with a resistor frame (2) and a fan bracket (3) located on one side of the resistor frame (2) in the lower part of the cabinet (1). A first resistor (4) and a second resistor (5) are provided on the resistor frame (2). A first fan (6) for blowing air to cool the first resistor (4) and a second fan (7) for blowing air to cool the second resistor (5) are provided on the fan bracket (3). A first partition (8) for installing the control unit is provided on the upper part of the resistor frame (2). An external interface plate (9) and an over-temperature control plate are provided on the first partition (8). The cabinet (1) is equipped with a second partition (10) located above the first partition (8) in the upper part of the cabinet (1). The second partition (10) is equipped with a coaxial converter (11) in the upper part of the second partition (10) and an emergency bracket (12) in the lower part of the second partition (10). The cabinet (1) is equipped with a front door (13) and a rear door (14). The front door (13) panel is equipped with a switch (15), an indicator light (16) and a high-frequency power meter (17). The fan bracket (3) is located inside the front door (13). The external interface board (9), the emergency bracket (12) and the over-temperature protection bracket (22) are all located inside the rear door (14). The resistor frame (2) includes a first insulating support plate (2-1) and a second insulating support plate (2-2) arranged in parallel, as well as a third insulating support plate (2-3) and a fourth insulating support plate (2-4) arranged in parallel; a first conductive connecting strip (2-5) is connected between one end of the first insulating support plate (2-1) and one end of the third insulating support plate (2-3), and a second conductive connecting strip (2-6) is connected between the other end of the first insulating support plate (2-1) and the other end of the third insulating support plate (2-3); one end of the second insulating support plate (2-2) A third conductive connecting strip (2-7) is connected between one end of the second insulating support plate (2-2) and the other end of the fourth insulating support plate (2-4). A fourth conductive connecting strip (2-8) is connected between the other end of the second insulating support plate (2-2) and the other end of the fourth insulating support plate (2-4). A first conductive strip assembly (2-9) and a second conductive strip assembly (2-10) are connected between the first conductive connecting strip (2-5) and the third conductive connecting strip (2-7). A third conductive strip assembly (2-11) is connected between the second conductive connecting strip (2-6) and the fourth conductive connecting strip (2-8). The first insulating support plate (2-1) is connected to a vertically arranged first insulating connecting plate (2-13) and a second insulating connecting plate (2-14). The second insulating support plate (2-2) is connected to a vertically arranged third insulating connecting plate (2-15) and a fourth insulating connecting plate (2-16). The first insulating connecting plate (2-13), the second insulating connecting plate (2-14), the third insulating connecting plate (2-15), and the fourth insulating connecting plate (2-16) are all connected to the cabinet body through a first bend (2-17). (1) Base plate connection: The third insulating support plate (2-3) is connected to a vertically arranged fifth insulating connecting plate (2-18) and a sixth insulating connecting plate (2-19); the fourth insulating support plate (2-4) is connected to a vertically arranged seventh insulating connecting plate (2-20) and an eighth insulating connecting plate (2-21); the fifth insulating connecting plate (2-18), the sixth insulating connecting plate (2-19), the seventh insulating connecting plate (2-20) and the eighth insulating connecting plate (2-21) are all connected to the first partition plate (8) through a second bend (2-22).

2. A broadcast transmitter switching device according to claim 1, characterized in that: The cabinet (1) is made of aluminum alloy plate, and the external dimensions of the cabinet (1) are: 600mm wide × 836mm deep × 1980mm high.

3. A broadcast transmitter switching device according to claim 1, characterized in that: The top of the cabinet (1) is provided with a host interface (18), a standby interface (19) and an antenna interface (20). The front door (13) and the rear door (14) are provided with heat dissipation holes (21). The host interface (18), the standby interface (19) and the antenna interface (20) are all connected to the coaxial converter (11) by a first feed tube (23).

4. A broadcast transmitter switching device according to claim 1, characterized in that: The first conductive strip assembly (2-9) includes a first conductive strip (2-91), a second conductive strip (2-92), a third conductive strip (2-93), a fourth conductive strip (2-94), and a fifth conductive strip (2-95) arranged parallel to each other from top to bottom. One end of the first conductive strip (2-91), one end of the second conductive strip (2-92), one end of the third conductive strip (2-93), one end of the fourth conductive strip (2-94), and one end of the fifth conductive strip (2-95) are all connected to the first conductive connecting strip (2-5). The other end of the electric strip (2-91), the other end of the second conductive strip (2-92), the other end of the third conductive strip (2-93), the other end of the fourth conductive strip (2-94), and the other end of the fifth conductive strip (2-95) are all connected to the third conductive connecting strip (2-7). The upper part of the first conductive strip (2-91), the upper part of the second conductive strip (2-92), the upper part of the third conductive strip (2-93), the upper part of the fourth conductive strip (2-94), and the upper part of the fifth conductive strip (2-95) are all provided with copper strips (2-96).

5. A broadcast transmitter switching device according to claim 4, characterized in that: The mechanical structures of the second conductive strip assembly (2-10), the third conductive strip assembly (2-11), and the fourth conductive strip assembly (2-12) are the same as those of the first conductive strip assembly (2-9). The first resistor (4) is connected between the first conductive strip assembly (2-9) and the third conductive strip assembly (2-11), and the second resistor (5) is connected between the second conductive strip assembly (2-10) and the fourth conductive strip assembly (2-12). The first resistor (4) and the second resistor (5) are arranged side by side and connected in parallel through the resistor frame (2) to form a dummy load. The dummy load is connected to the coaxial converter (11) by a second feed tube (24).

6. A broadcast transmitter switching device according to claim 1, characterized in that: The external interface board (9) is provided with circuit external interfaces, which include a main unit high-voltage interlock interface XS1, a standby unit high-voltage interlock interface XS2, a main unit antenna positioning interlock interface XS3, a standby unit antenna positioning interlock interface XS4, a main unit dummy load interlock interface XS5, a standby unit dummy load interlock interface XS6, a main / standby unit switching automatic control interface XS7, a status display interface XS8, and a main / standby unit dummy load automatic control interface XS9; the main unit high-voltage interlock interface XS1 includes XS1:1, XS1:2, and XS1:3, the standby unit high-voltage interlock interface XS2 includes XS2:1, XS2:2, and XS2:3, and the main unit antenna positioning interlock interface XS3 includes XS1:1, XS2:2, and XS2:

3. The standby antenna arrival interlocking interface XS4 includes XS4:1, XS4:2, and XS4:3; the master dummy load interlocking interface XS5 includes XS5:1, XS5:2, and XS5:3; the standby dummy load interlocking interface XS6 includes XS6:1, XS6:2, and XS6:3; the master / standby switchover automatic control interface XS7 includes XS7:1, XS7:2, and XS7:3; the status display interface XS8 includes XS8:1, XS8:2, XS8:3, XS8:4, and XS8:5; and the master / standby dummy load automatic control interface XS9 includes XS9:1, XS9:2, and XS9:

3. The switch (15) includes an external power supply switch SA1, a control mode switching switch SA2, an internal control switching selection switch SA3, and a dummy load power switch SA6; the indicator lights (16) include host to antenna indicator lights HL1~HL4, host to dummy load indicator lights HL5~HL8, standby to antenna indicator lights HL9~HL12 and standby to dummy load indicator lights HL13~HL16, as well as host switching indicator lights HL17, standby switching indicator lights HL18, antenna switching indicator lights HL19 and dummy load switching indicator lights HL20.

7. A broadcast transmitter switching device according to claim 6, characterized in that: The emergency support bracket (12) is equipped with a high-voltage interlock switch SA4 and an antenna positioning interlock switch SA5; the over-temperature protection bracket (22) is equipped with a temperature sensor ST1.

8. A broadcast transmitter switching device according to claim 7, characterized in that: The control unit includes a main control circuit, a main unit interlocking circuit, a backup unit interlocking circuit, an emergency interlocking circuit, and a dummy load control circuit. The main control circuit includes fuse FU1, 24V switching power supply E1, DC relay KA1, DC relay KA2, DC relay KA3, DC relay KA4, DC relay KA7 and DC relay KA8, and the terminal block TXP5 of the coaxial converter (11). The host interlocking circuit includes a host high-voltage interlocking circuit and a host antenna positioning interlocking circuit. The standby interlocking circuit includes a standby high-voltage interlocking circuit and a standby antenna positioning interlocking circuit. The emergency interlocking circuit includes a high-voltage emergency interlocking circuit and an antenna-in-position emergency interlocking circuit. The dummy load control circuit includes a DC relay KA5, an AC relay KA6, a fuse FU2, and a fuse FU3. The dummy load interlocking circuit includes a main unit dummy load interlocking circuit and a standby unit dummy load interlocking circuit. In the main unit dummy load interlocking circuit, contact 1 of the AC relay KA6 is connected to both the main unit high-voltage interlocking interface XS1:1 and the main unit dummy load interlocking interface XS5:1, and normally closed contact 11 of the DC relay KA7 is connected to both the main unit high-voltage interlocking interface XS1:2 and the main unit dummy load interlocking interface XS5:

2. In the standby unit dummy load interlocking circuit, contact 6 of the AC relay KA6 is connected to both the standby unit high-voltage interlocking interface XS2:1 and the standby unit dummy load interlocking interface XS6:1, and normally closed contact 11 of the DC relay KA8 is connected to both the standby unit high-voltage interlocking interface XS2:2 and the standby unit dummy load interlocking interface XS6:

2.

9. A switching method for a broadcast transmitter switching device, characterized in that, Using the switching device as described in claim 8, the switching method includes a manual switching method, an automatic switching method, an emergency switching method, and an over-temperature automatic protection method; The specific process of the manual switching method includes: connecting external power and turning on the external power supply switch; Host switching: Control mode switching switch SA2 switches the connection between terminal 4 and terminal 4a. At the same time, internal control switching selection switch SA3 switches the connection between terminal 4 and terminal 4a. The normally closed contacts 1 and 4 of DC relay KA2 are closed. The coil of DC relay KA1 is energized. The normally open contacts 6 and 7 of DC relay KA1 are closed. Terminals 1 and 2 of the wiring terminal TXP5 of the coaxial converter (11) are connected to AC220V. The AC motor inside the coaxial converter (11) rotates clockwise. The internal blades are turned towards the host position. Standby switch: Control mode switch SA2 still switches to connect terminal 4 and terminal 4a. At the same time, internal control switch SA3 switches to connect terminal 3 and terminal 3a. The normally closed contacts 1 and 4 of DC relay KA1 are closed. The coil of DC relay KA2 is energized. The normally open contacts 6 and 7 of DC relay KA2 are closed. Terminals 1 and 3 of the wiring terminal TXP5 of the coaxial converter (11) are connected to AC220V. The AC motor inside the coaxial converter (11) rotates counterclockwise. The internal blade is switched to the standby position. The principle of master switchover and standby switchover in the automatic switching method is the same as that of manual switchover. Automatic switching is performed by connecting an external controller through the master / standby switchover automatic control interface XS7. The specific process of the emergency switching method includes: Transmitter switching: Switch both the control mode switching switch SA2 and the internal control switching selection switch SA3 to the middle position, open the front door (13), manually turn the handle on the coaxial converter (11) to switch the working status of the main unit and the standby unit; The specific process of the over-temperature automatic protection method includes: when the temperature of the dummy load resistor is greater than or equal to 60°C, the normally closed contact of the temperature sensor ST1 opens, the coil of the AC relay KA6 is de-energized, the interlock is disconnected, and the transmitter loses high voltage; when the temperature of the dummy load resistor is less than 60°C, the normally closed contact of the temperature sensor ST1 that was disconnected closes again.

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