Display control board for very high frequency ground platform

Abstract

The utility model discloses a display control board used for a very high frequency ground platform, which can accurately receive and process signals from the ground platform through signals of the very high frequency ground platform, avoids missing and missing of information, improves signal receiving reliability of the display control board, and ensures real-time display and feedback of the information. And after the light-emitting control circuit receives the voltage signal sent by the very high frequency ground station signal receiving circuit, the light-emitting control circuit performs light-emitting control, generates a light-emitting control signal and controls the pixel circuit of the output adjusting circuit to emit light. By accurately controlling light emission, the influence of electric leakage on the display effect is reduced, the display quality of the display panel when the display panel displays a black picture is improved, and the occurrence of bright spots is reduced; the stable driving signal is provided through the driving circuit, it is ensured that the pixel circuit of the display panel can work stably, display abnormity caused by unstable driving is avoided, and it is ensured that the display control panel can emit light correctly according to the control signal.

Description

Technical Field

[0001] This utility model relates to the field of VHF ground station technology, and specifically to a display and control board for VHF ground stations. Background Technology

[0002] A VHF ground station is a type of ground-based navigation beacon station equipped with a digital board for digital signal processing. This digital board receives intermediate frequency (IF) signals from the radio frequency (RF) front-end and outputs audio signals in voice mode, thus completing the signal switching from IF to audio to achieve communication functions.

[0003] Communication information is typically displayed and fed back through a display and control board. For VHF ground stations, these boards are required to display and feedback information in real time during use; otherwise, missed or lost information could lead to serious accidents. However, current VHF ground station display and control boards suffer from leakage current, which can cause bright spots to appear on the display panel when showing a black screen, affecting the display quality. Furthermore, the display quality depends on the driving voltage. Currently, the output voltage in the circuitry of VHF ground station display and control boards is poorly matched to the display quality, resulting in poor display performance. All of these factors can lead to incorrect information feedback for VHF ground stations, resulting in inaccurate interpretation of navigation information. Utility Model Content

[0004] To address the problems mentioned above in the background technology, the purpose of this utility model is to provide a display control board for VHF terrestrial stations, solving the problem that current display control boards for VHF terrestrial stations have leakage problems, which may cause bright spots to appear on the display panel when displaying a black screen, affecting the display effect; and that the output voltage in the circuit of the display control board for VHF terrestrial stations has a low matching degree with the display effect of the display control board, resulting in poor display effect.

[0005] This utility model is achieved through the following technical solution:

[0006] A display and control board for a VHF terrestrial station includes:

[0007] VHF ground station signal receiving circuit, used to receive voltage signals from VHF ground stations;

[0008] A light-emitting control circuit is used to control the light emission after receiving the voltage signal and generate a light-emitting control signal;

[0009] A driving circuit is used to provide a driving signal for the light-emitting control circuit;

[0010] A power-off sustaining circuit is used to provide a driving signal to the light-emitting control circuit when power is off;

[0011] An output adjustment circuit is used to control the information display output after receiving the light emission control signal;

[0012] A voltage compensation circuit is used to provide a compensation voltage for the output adjustment circuit.

[0013] In the above technical solution, the VHF ground station signal receiving circuit is responsible for receiving voltage signals from the VHF ground station. It serves as a bridge for communication between the display and control board and the ground station. By using the VHF ground station signal, it ensures that the display and control board can accurately receive and process signals from the ground station, avoiding information loss and omission, improving the signal reception reliability of the display and control board, and ensuring the real-time display and feedback of information.

[0014] The light-emitting control circuit is the core structure of this invention. Upon receiving a voltage signal from the VHF terrestrial signal receiving circuit, the light-emitting control circuit generates a light-emitting control signal, which in turn controls the pixel circuits of the output adjustment circuit to emit light. By precisely controlling the light emission, it reduces the impact of leakage current on the display effect, improves the display quality of the display panel when displaying black screens, and reduces the appearance of bright spots.

[0015] The display effect of the display control board depends on the driving voltage. Currently, the output voltage of the display control board circuit used in VHF terrestrial stations has a low matching degree with the display effect of the display control board, resulting in poor display effect. Therefore, this utility model proposes a driving circuit that provides a driving signal for the light emission control circuit. By providing a stable driving signal, the pixel circuit of the display panel can be guaranteed to work stably, avoiding display abnormalities caused by unstable driving, and ensuring that the display control board can emit light correctly according to the control signal and correctly feed back information from the VHF terrestrial station.

[0016] In the event of a power outage, the power-off maintenance circuit provides the necessary drive signal to the light-emitting control circuit to maintain the display state of the display control board; after receiving the light-emitting control signal, the output adjustment circuit performs information display control output and adjusts the display effect to match the display requirements of the ground station.

[0017] However, when the voltage of the output adjustment circuit is unstable, the display on the control board is also incomplete. Therefore, this utility model provides a voltage compensation circuit, which provides feedback voltage to the voltage compensation circuit when the voltage of the output adjustment circuit is unstable. The voltage compensation circuit then feeds back to the drive circuit, which provides the drive voltage to ensure the display effect.

[0018] In one optional embodiment, the VHF terrestrial station signal receiving circuit includes: capacitors C1, C2, C3, C4, C5, C6, C7, and C8; resistors R5 and R6; switches S1 and S2; inductors L1 and L2; transistor Q2; a first power supply module; and a second power supply module.

[0019] In this configuration, capacitor C1 and capacitor C2 are connected in series to the common port of switch S1; capacitor C4 is connected to selection port 1 of switch S1; capacitor C5 is connected to selection port 2 of switch S1; and the first power supply module is connected to the power supply port of switch S1. Capacitor C3 is connected in series with inductor L1, and inductor L1 is connected to capacitor C1. The base of transistor Q2 is connected to capacitor C4, and the collector of transistor Q2 is connected to selection port 1 of switch S2. The capacitor C5 is connected to the selection port 2 of the switch S2; the capacitor C8 and the inductor L5 are connected in series to the common port of the switch S2; the second power supply module is connected to the power supply port of the switch S2; the resistor R5, the capacitor C6, and the inductor L2 are connected in series and then in parallel between the base and collector of the transistor Q2; the resistor R6 is connected in parallel with the capacitor C6; the inductor L3 and the inductor L4 are connected in series to the selection port 1 of the switch S2; the capacitor C4 is connected to the inductor L4.

[0020] In one optional embodiment, the first power supply module includes: resistors R1, R2, R3, and R4, and transistor Q1;

[0021] The collector of transistor Q1 is connected to resistor R1, the base of transistor Q1 is connected to resistor R2, the two ends of resistor R3 are connected to resistor R2 and the negative terminal of the power supply port of switch S1, respectively; one end of resistor R4 is connected to the positive terminal of the power supply port of switch S1, and the other end is connected to the intermediate node between resistor R1 and transistor Q1.

[0022] In one optional embodiment, the second power supply module includes: resistors R7, R8, R9, and R10, and transistor Q3;

[0023] In this configuration, resistors R7 and R9 are connected in parallel to the collector of transistor Q3, resistor R10 is connected to the base of transistor Q3, the two ends of resistor R8 are connected to resistor R10 and the negative terminal of the power supply port of switch S2, and resistor R7 is connected to the positive terminal of the power supply port of switch S2.

[0024] In one optional embodiment, the light-emitting control circuit includes: resistors R11, R12, R13, R14, R15, R16, R17, R18, R19, and R20; capacitors C9 and C10; transistor Q4; transistor Q5; and chip U1.

[0025] Specifically, the DET port of chip U1 is connected to the intermediate node between resistors R19 and R20; the DRA port of chip U1 is connected to resistor R17; the GATE port of chip U1 is connected to resistor R18; the CSA port of chip U1 is connected to resistor R16; the CSB port of chip U1 is connected to the intermediate node between resistors R11 and R12; the V1 port of chip U1 is connected to the base of transistor Q5; and the LIGHT port of chip U1 is connected to the base of transistor Q4. Capacitor C10 is connected in parallel with resistor R12; the two ends of resistor R15 are connected to the emitter of transistor Q5 and the collector of transistor Q4, respectively; resistor R14 is connected in parallel with resistor R15; and resistor R13 and capacitor C9 are both connected in parallel between the base and emitter of transistor Q4.

[0026] In one alternative embodiment, the output adjustment circuit includes: transistor Q6, transistor Q7, diode D1, diode D2, inductor L6, resistor R21, and capacitor C11;

[0027] In this configuration, the emitter of transistor Q5 is connected to the negative terminals of diodes D1 and D2, the anode of diode D1 is connected to the base of transistor Q6, the anode of diode D2 is connected to the base of transistor Q7, the emitter of transistor Q7 is connected to the collector of transistor Q6, the inductor L6 is connected between transistors Q7 and Q6, and the resistor R21 and the capacitor C11 are connected in parallel to one end of the inductor L6.

[0028] In one alternative embodiment, the voltage compensation circuit includes: resistor R22, resistor R23, and capacitor C12;

[0029] The resistor R22 and the capacitor C12 are connected in parallel to the collector of the transistor Q7, and the resistor R23 is connected to the capacitor C12 and the resistor R22.

[0030] In one optional embodiment, the driving circuit includes: a first rectifier module, a second rectifier module, a transformer module, a pulse control module, a power control module, and a voltage regulator module;

[0031] The output terminal of the first rectifier module is connected to the input terminal of the transformer module, the output terminal of the transformer module is connected to the input terminal of the second rectifier module, the output terminal of the second rectifier module is connected to the input terminal of the voltage regulator module, the output terminal of the power control module is connected to the input terminal of the transformer module, and the output terminal of the pulse control module is connected to the input terminal of the transformer module.

[0032] In one optional embodiment, the first rectifier module includes: inductor X1, chip U2, capacitor C13, capacitor C14, inductor L7 and resistor R24;

[0033] In this configuration, the inductor X1 is connected to the AC port of the chip U2, the capacitors C13 and C14 are connected in parallel between the V+ and V- ports of the chip U2, the two ends of the resistor R24 ​​are connected to the capacitors C13 and C14 respectively, and the inductor L7 is connected in parallel between the two ends of the resistor R24.

[0034] In one optional embodiment, the power control module includes: resistors R26, R27, R28, R29, and R30; capacitors C18 and C19; diode D3; and transistor Q10.

[0035] In this configuration, resistors R26 and R27 are connected in series to the base of transistor Q10; resistor R28, capacitor C18, and diode D3 are all connected in parallel between the base and emitter of transistor Q10; resistors R29 and R30 are connected in parallel to the collector of transistor Q10; and capacitor C19 is connected to resistor R30.

[0036] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0037] This addresses the issue of leakage current in the display and control boards currently used in VHF terrestrial stations. This leakage current can cause bright spots to appear on the display panel when displaying a black screen, affecting the display effect. It also addresses the problem of low matching between the output voltage of the display and control board circuit and the display effect of the display and control board, resulting in poor display effect. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0039] Figure 1 A schematic diagram of the structure of a display and control board for a VHF terrestrial station provided in Embodiment 1 of this utility model;

[0040] Figure 2 A schematic diagram of the VHF terrestrial station signal receiving circuit provided in Embodiment 1 of this utility model;

[0041] Figure 3 A schematic diagram of the light-emitting control circuit and output adjustment circuit provided in Embodiment 1 of this utility model;

[0042] Figure 4This is a schematic diagram of the driving circuit provided in Embodiment 1 of this utility model. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings in an optional embodiment. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0044] Example 1

[0045] This embodiment 1 provides a display and control board for a VHF terrestrial station, such as... Figure 1 As shown, a display and control board for a VHF terrestrial station includes:

[0046] VHF ground station signal receiving circuit, used to receive voltage signals from VHF ground stations;

[0047] A light-emitting control circuit is used to control the light emission after receiving the voltage signal and generate a light-emitting control signal;

[0048] A driving circuit is used to provide a driving signal for the light-emitting control circuit;

[0049] A power-off sustaining circuit is used to provide a driving signal to the light-emitting control circuit when power is off;

[0050] An output adjustment circuit is used to control the information display output after receiving the light emission control signal;

[0051] A voltage compensation circuit is used to provide a compensation voltage for the output adjustment circuit.

[0052] It should be noted that the VHF ground station signal receiving circuit is responsible for receiving voltage signals from the VHF ground station. It serves as a bridge for communication between the display and control board and the ground station. By using the VHF ground station signal, the display and control board can accurately receive and process signals from the ground station, avoiding information loss and omission, improving the signal reception reliability of the display and control board, and ensuring the real-time display and feedback of information.

[0053] The light-emitting control circuit is the core structure of this invention. Upon receiving a voltage signal from the VHF terrestrial signal receiving circuit, the light-emitting control circuit generates a light-emitting control signal, which in turn controls the pixel circuits of the output adjustment circuit to emit light. By precisely controlling the light emission, it reduces the impact of leakage current on the display effect, improves the display quality of the display panel when displaying black screens, and reduces the appearance of bright spots.

[0054] The display effect of the display control board depends on the driving voltage. Currently, the output voltage of the display control board circuit used in VHF terrestrial stations has a low matching degree with the display effect of the display control board, resulting in poor display effect. Therefore, this utility model proposes a driving circuit that provides a driving signal for the light emission control circuit. By providing a stable driving signal, the pixel circuit of the display panel can be guaranteed to work stably, avoiding display abnormalities caused by unstable driving, and ensuring that the display control board can emit light correctly according to the control signal and correctly feed back information from the VHF terrestrial station.

[0055] In the event of a power outage, the power-off maintenance circuit provides the necessary drive signal to the light-emitting control circuit to maintain the display state of the display control board; after receiving the light-emitting control signal, the output adjustment circuit performs information display control output and adjusts the display effect to match the display requirements of the ground station.

[0056] However, when the voltage of the output adjustment circuit is unstable, the display on the control board is also incomplete. Therefore, this utility model provides a voltage compensation circuit, which provides feedback voltage to the voltage compensation circuit when the voltage of the output adjustment circuit is unstable. The voltage compensation circuit then feeds back to the drive circuit, which provides the drive voltage to ensure the display effect.

[0057] In one optional embodiment, the VHF terrestrial station signal receiving circuit includes: capacitors C1, C2, C3, C4, C5, C6, C7, and C8; resistors R5 and R6; switches S1 and S2; inductors L1 and L2; transistor Q2; a first power supply module; and a second power supply module.

[0058] In this configuration, capacitor C1 and capacitor C2 are connected in series to the common port of switch S1; capacitor C4 is connected to selection port 1 of switch S1; capacitor C5 is connected to selection port 2 of switch S1; and the first power supply module is connected to the power supply port of switch S1. Capacitor C3 is connected in series with inductor L1, and inductor L1 is connected to capacitor C1. The base of transistor Q2 is connected to capacitor C4, and the collector of transistor Q2 is connected to selection port 1 of switch S2. The capacitor C5 is connected to the selection port 2 of the switch S2; the capacitor C8 and the inductor L5 are connected in series to the common port of the switch S2; the second power supply module is connected to the power supply port of the switch S2; the resistor R5, the capacitor C6, and the inductor L2 are connected in series and then in parallel between the base and collector of the transistor Q2; the resistor R6 is connected in parallel with the capacitor C6; the inductor L3 and the inductor L4 are connected in series to the selection port 1 of the switch S2; the capacitor C4 is connected to the inductor L4.

[0059] like Figure 2As shown, signals are switched via switches S1 and S2, thereby receiving various signals from VHF ground stations. Capacitors and inductors are used to filter the acquired signals, removing noise and interference. Resistors R5, C6, and L2 are connected in series and then in parallel between the base and collector of transistor Q2 to adjust the transistor's operating point; R6 is connected in parallel with C6 to further adjust the circuit's time constant. This achieves preliminary reception and processing of signals from VHF ground stations.

[0060] In one optional embodiment, the first power supply module includes: resistors R1, R2, R3, and R4, and transistor Q1;

[0061] The collector of transistor Q1 is connected to resistor R1, the base of transistor Q1 is connected to resistor R2, the two ends of resistor R3 are connected to resistor R2 and the negative terminal of the power supply port of switch S1, respectively; one end of resistor R4 is connected to the positive terminal of the power supply port of switch S1, and the other end is connected to the intermediate node between resistor R1 and transistor Q1.

[0062] In one optional embodiment, the second power supply module includes: resistors R7, R8, R9, and R10, and transistor Q3;

[0063] In this configuration, resistors R7 and R9 are connected in parallel to the collector of transistor Q3, resistor R10 is connected to the base of transistor Q3, the two ends of resistor R8 are connected to resistor R10 and the negative terminal of the power supply port of switch S2, and resistor R7 is connected to the positive terminal of the power supply port of switch S2.

[0064] In one optional embodiment, the light-emitting control circuit includes: resistors R11, R12, R13, R14, R15, R16, R17, R18, R19, and R20; capacitors C9 and C10; transistor Q4; transistor Q5; and chip U1.

[0065] Specifically, the DET port of chip U1 is connected to the intermediate node between resistors R19 and R20; the DRA port of chip U1 is connected to resistor R17; the GATE port of chip U1 is connected to resistor R18; the CSA port of chip U1 is connected to resistor R16; the CSB port of chip U1 is connected to the intermediate node between resistors R11 and R12; the V1 port of chip U1 is connected to the base of transistor Q5; and the LIGHT port of chip U1 is connected to the base of transistor Q4. Capacitor C10 is connected in parallel with resistor R12; the two ends of resistor R15 are connected to the emitter of transistor Q5 and the collector of transistor Q4, respectively; resistor R14 is connected in parallel with resistor R15; and resistor R13 and capacitor C9 are both connected in parallel between the base and emitter of transistor Q4.

[0066] In this embodiment, as Figure 3 As shown, chip U1 uses a GD3160 driver chip, which integrates isolated and low-resistance driver transistors to provide high-performance gate driving. It is used as the driver in the light-emitting control circuit of this embodiment. Specifically, the DET port is connected to the midpoint between resistors R19 and R20 to detect the current state of the display control board; the DRA port is connected to resistor R17 to adjust the current and brightness of the display control board; and the V1 port is connected to the base of transistor Q5 as a feedback signal connected to the power-off sustaining circuit.

[0067] Furthermore, the power-off sustaining circuit includes transistor Q8.

[0068] Furthermore, the signal initialization circuit includes transistor Q9.

[0069] In one alternative embodiment, the output adjustment circuit includes: transistor Q6, transistor Q7, diode D1, diode D2, inductor L6, resistor R21, and capacitor C11;

[0070] In this configuration, the emitter of transistor Q5 is connected to the negative terminals of diodes D1 and D2, the anode of diode D1 is connected to the base of transistor Q6, the anode of diode D2 is connected to the base of transistor Q7, the emitter of transistor Q7 is connected to the collector of transistor Q6, the inductor L6 is connected between transistors Q7 and Q6, and the resistor R21 and the capacitor C11 are connected in parallel to one end of the inductor L6.

[0071] In one alternative embodiment, the voltage compensation circuit includes: resistor R22, resistor R23, and capacitor C12;

[0072] The resistor R22 and the capacitor C12 are connected in parallel to the collector of the transistor Q7, and the resistor R23 is connected to the capacitor C12 and the resistor R22.

[0073] In one optional embodiment, the driving circuit includes: a first rectifier module, a second rectifier module, a transformer module, a pulse control module, a power control module, and a voltage regulator module;

[0074] The output terminal of the first rectifier module is connected to the input terminal of the transformer module, the output terminal of the transformer module is connected to the input terminal of the second rectifier module, the output terminal of the second rectifier module is connected to the input terminal of the voltage regulator module, the output terminal of the power control module is connected to the input terminal of the transformer module, and the output terminal of the pulse control module is connected to the input terminal of the transformer module.

[0075] like Figure 4 As shown, the first rectifier module includes: inductor X1, chip U2, capacitor C13, capacitor C14, inductor L7, and resistor R24. The second rectifier module includes: inductor X2, chip U3, capacitor C15, capacitor C16, inductor L8, and resistor R25. Chips U1 and U2 are AC-DC power conversion chips; in this embodiment, the GP8403 chip is used to achieve power conversion. The transformer module includes a current transformer T1, which connects the first and second rectifier modules.

[0076] The current transformer T1 is connected to a power control module. The power control module detects the pulse signal generated by the power control module and feeds back the detection result to the transformer module to achieve power control.

[0077] Specifically, the pulse control module uses a PWM pulse control chip, and in this embodiment, the SG3525 integrated chip is used to implement PWM pulse control.

[0078] In one optional embodiment, the first rectifier module includes: inductor X1, chip U2, capacitor C13, capacitor C14, inductor L7 and resistor R24;

[0079] In this configuration, the inductor X1 is connected to the AC port of the chip U2, the capacitors C13 and C14 are connected in parallel between the V+ and V- ports of the chip U2, the two ends of the resistor R24 ​​are connected to the capacitors C13 and C14 respectively, and the inductor L7 is connected in parallel between the two ends of the resistor R24.

[0080] In one optional embodiment, the power control module includes: resistors R26, R27, R28, R29, and R30; capacitors C18 and C19; diode D3; and transistor Q10.

[0081] In this configuration, resistors R26 and R27 are connected in series to the base of transistor Q10; resistor R28, capacitor C18, and diode D3 are all connected in parallel between the base and emitter of transistor Q10; resistors R29 and R30 are connected in parallel to the collector of transistor Q10; and capacitor C19 is connected to resistor R30.

[0082] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A display and control board for a VHF terrestrial station, characterized in that, include: VHF ground station signal receiving circuit, used to receive voltage signals from VHF ground stations; A light-emitting control circuit is used to control the light emission after receiving the voltage signal and generate a light-emitting control signal; A driving circuit is used to provide a driving signal for the light-emitting control circuit; A power-off sustaining circuit is used to provide a driving signal to the light-emitting control circuit when power is off; An output adjustment circuit is used to control the information display output after receiving the light emission control signal; A voltage compensation circuit is used to provide a compensation voltage for the output adjustment circuit.

2. The display and control board for a VHF terrestrial station according to claim 1, characterized in that, The VHF ground station signal receiving circuit includes: capacitors C1, C2, C3, C4, C5, C6, C7, and C8; resistors R5 and R6; switches S1 and S2; inductors L1 and L2; transistor Q2; a first power supply module; and a second power supply module. In this configuration, capacitor C1 and capacitor C2 are connected in series to the common port of switch S1; capacitor C4 is connected to selection port 1 of switch S1; capacitor C5 is connected to selection port 2 of switch S1; and the first power supply module is connected to the power supply port of switch S1. Capacitor C3 is connected in series with inductor L1, and inductor L1 is connected to capacitor C1. The base of transistor Q2 is connected to capacitor C4, and the collector of transistor Q2 is connected to selection port 1 of switch S2. The capacitor C5 is connected to the selection port 2 of the switch S2; the capacitor C8 and the inductor L5 are connected in series to the common port of the switch S2; the second power supply module is connected to the power supply port of the switch S2; the resistor R5, the capacitor C6, and the inductor L2 are connected in series and then in parallel between the base and collector of the transistor Q2; the resistor R6 is connected in parallel with the capacitor C6; the inductor L3 and the inductor L4 are connected in series to the selection port 1 of the switch S2; the capacitor C4 is connected to the inductor L4.

3. A display and control board for a VHF terrestrial station according to claim 2, characterized in that, The first power supply module includes: resistors R1, R2, R3, and R4, and transistor Q1; The collector of transistor Q1 is connected to resistor R1, the base of transistor Q1 is connected to resistor R2, the two ends of resistor R3 are connected to resistor R2 and the negative terminal of the power supply port of switch S1, respectively; one end of resistor R4 is connected to the positive terminal of the power supply port of switch S1, and the other end is connected to the intermediate node between resistor R1 and transistor Q1.

4. A display and control board for a VHF terrestrial station according to claim 2, characterized in that, The second power supply module includes: resistors R7, R8, R9, R10 and transistor Q3; In this configuration, resistors R7 and R9 are connected in parallel to the collector of transistor Q3, resistor R10 is connected to the base of transistor Q3, the two ends of resistor R8 are connected to resistor R10 and the negative terminal of the power supply port of switch S2, and resistor R7 is connected to the positive terminal of the power supply port of switch S2.

5. A display and control board for a VHF terrestrial station according to claim 4, characterized in that, The light-emitting control circuit includes: resistors R11, R12, R13, R14, R15, R16, R17, R18, R19, and R20; capacitors C9 and C10; transistors Q4 and Q5; and chip U1. Specifically, the DET port of chip U1 is connected to the intermediate node between resistors R19 and R20; the DRA port of chip U1 is connected to resistor R17; the GATE port of chip U1 is connected to resistor R18; the CSA port of chip U1 is connected to resistor R16; the CSB port of chip U1 is connected to the intermediate node between resistors R11 and R12; the V1 port of chip U1 is connected to the base of transistor Q5; and the LIGHT port of chip U1 is connected to the base of transistor Q4. Capacitor C10 is connected in parallel with resistor R12; the two ends of resistor R15 are connected to the emitter of transistor Q5 and the collector of transistor Q4, respectively; resistor R14 is connected in parallel with resistor R15; and resistor R13 and capacitor C9 are both connected in parallel between the base and emitter of transistor Q4.

6. A display and control board for a VHF terrestrial station according to claim 5, characterized in that, The output adjustment circuit includes: transistor Q6, transistor Q7, diode D1, diode D2, inductor L6, resistor R21 and capacitor C11; In this configuration, the emitter of transistor Q5 is connected to the negative terminals of diodes D1 and D2, the anode of diode D1 is connected to the base of transistor Q6, the anode of diode D2 is connected to the base of transistor Q7, the emitter of transistor Q7 is connected to the collector of transistor Q6, the inductor L6 is connected between transistors Q7 and Q6, and the resistor R21 and the capacitor C11 are connected in parallel to one end of the inductor L6.

7. A display and control board for a VHF terrestrial station according to claim 6, characterized in that, The voltage compensation circuit includes: resistor R22, resistor R23 and capacitor C12; The resistor R22 and the capacitor C12 are connected in parallel to the collector of the transistor Q7, and the resistor R23 is connected to the capacitor C12 and the resistor R22.

8. A display and control board for a VHF terrestrial station according to claim 1, characterized in that, The drive circuit includes: a first rectifier module, a second rectifier module, a transformer module, a pulse control module, a power control module, and a voltage regulator module; The output terminal of the first rectifier module is connected to the input terminal of the transformer module, the output terminal of the transformer module is connected to the input terminal of the second rectifier module, the output terminal of the second rectifier module is connected to the input terminal of the voltage regulator module, the output terminal of the power control module is connected to the input terminal of the transformer module, and the output terminal of the pulse control module is connected to the input terminal of the transformer module.

9. A display and control board for a VHF terrestrial station according to claim 8, characterized in that, The first rectifier module includes: inductor X1, chip U2, capacitor C13, capacitor C14, inductor L7 and resistor R24; In this configuration, the inductor X1 is connected to the AC port of the chip U2, the capacitors C13 and C14 are connected in parallel between the V+ and V- ports of the chip U2, the two ends of the resistor R24 ​​are connected to the capacitors C13 and C14 respectively, and the inductor L7 is connected in parallel between the two ends of the resistor R24.

10. A display and control board for a VHF terrestrial station according to claim 9, characterized in that, The power control module includes: resistors R26, R27, R28, R29, and R30; capacitors C18 and C19; diode D3; and transistor Q10. In this configuration, resistors R26 and R27 are connected in series to the base of transistor Q10; resistor R28, capacitor C18, and diode D3 are all connected in parallel between the base and emitter of transistor Q10; resistors R29 and R30 are connected in parallel to the collector of transistor Q10; and capacitor C19 is connected to resistor R30.

Images