Atmospheric transmissometer transmitter voltage monitoring alarm circuit

Abstract

The utility model discloses a voltage monitoring alarm circuit of an atmospheric transmissometer transmitter, which comprises a voltage dividing unit, a voltage stabilizing and current limiting unit, a filtering unit, a chip NE555, an auxiliary adjusting unit, an alarm unit and a protection unit, the other end of the voltage dividing unit is connected with one end of the voltage stabilizing and current limiting unit, the other end of the voltage stabilizing and current limiting unit is respectively connected with a THR pin end and a TRI pin end of the chip NE555, one end of the auxiliary adjusting unit is respectively connected with the other end of the voltage stabilizing and current limiting unit and the TRI pin end of the chip NE555, one end of the alarm unit is connected with an OUT pin end of the chip NE555, and the other end of the alarm unit is connected with an OUT pin end of the chip NE555. One end of the filtering unit is connected with the CON pin end of the chip NE555; when the voltage of the monitored end of the atmospheric transmissometer is monitored to be lower than the voltage alarm threshold value, the chip NE555 controls the alarm unit to give an alarm.

Description

Technical Field

[0001] This utility model relates to the field of civil aviation flight technology, and in particular to an atmospheric transmissometer transmitter voltage monitoring and alarm circuit. Background Technology

[0002] Weather is a crucial factor affecting civil aviation flight safety, flight regularity, and economic efficiency, with low visibility being a significant weather type impacting operations. In airport operations, air traffic controllers rely on Runway Visual Range (RVR) to direct aircraft takeoffs and landings. RVR is a calculated value related to Meteorological Optical Range (MOR), ambient light intensity, and runway lighting levels. MOR is typically measured using an atmospheric transilluminator or forward scattering instrument. The atmospheric transilluminator calculates visibility by directly measuring the extinction coefficient of the horizontal air column between the transmitter and receiver. Therefore, the proper functioning of the atmospheric transilluminator and the accuracy of its data directly affect operational safety.

[0003] Currently, the LT31 atmospheric transilluminator is widely used in the civil aviation meteorological industry. However, the LT31 has a drawback in practical application: compared to the main CPU monitoring within the receiver chassis, the transmitter chassis lacks voltage monitoring and alarm mechanisms. By design, when the input operating voltage is interrupted, the receiver chassis automatically switches to backup battery power, which can sustain the equipment for a period of time. However, due to the lack of monitoring and alarm mechanisms, maintenance personnel cannot be aware of the power outage to the transmitter chassis, resulting in a lack of fault information. When the battery is depleted quickly, the equipment shuts down, causing RVR detection interruptions and impacting civil aviation operations. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides an atmospheric transilluminator transmitter voltage monitoring and alarm circuit, which realizes the monitoring and alarm of the input voltage of the atmospheric transilluminator transmitter chassis. When the working voltage is interrupted or falls below the voltage alarm threshold, the monitoring circuit will respond and provide a remote alarm.

[0005] To achieve the above-mentioned objectives, this utility model adopts the following technical solution:

[0006] An atmospheric transilluminator transmitter voltage monitoring and alarm circuit includes a voltage divider unit, a voltage regulation and current limiting unit, a filter unit, an NE555 chip, an auxiliary adjustment unit, an alarm unit, and a protection unit. One end of the voltage divider unit is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of the voltage divider unit is connected to one end of the voltage regulation and current limiting unit. The other end of the voltage regulation and current limiting unit is connected to the THR pin and the TRI pin of the NE555 chip, respectively. One end of the auxiliary adjustment unit is connected to the other end of the voltage regulation and current limiting unit and the TRI pin of the NE555 chip, respectively. One end of the alarm unit is connected to the OUT pin of the NE555 chip, one end of the filter unit is connected to the CON pin of the NE555 chip, the VCC pin of the NE555 chip is connected to the positive terminal of the power supply, and the other end of the alarm unit is connected to one end of the protection unit. When the voltage at the monitored terminal of the atmospheric transilluminator is lower than the voltage alarm threshold, the NE555 chip controls the alarm unit to issue an alarm.

[0007] The voltage divider unit includes resistors R1 and R2. One end of resistor R1 is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of resistor R1 is connected to one end of resistor R2 and one end of the voltage stabilization and current limiting unit. The other end of resistor R2 is grounded.

[0008] The voltage regulation and current limiting unit includes a Zener diode D1 and a resistor R3. The positive terminal of the Zener diode D1 is connected to one end of the resistor R3 and the other end of the voltage divider unit, respectively. The negative terminal of the Zener diode D1 is connected to the TRI pin of the NE555 chip and one end of the auxiliary adjustment unit, respectively. The other end of the resistor R3 is connected to the THR pin of the NE555 chip.

[0009] The filter unit includes capacitor C1. One end of capacitor C1 is connected to the CON pin of the NE555 chip, and the other end of capacitor C1 is grounded.

[0010] The auxiliary adjustment unit includes resistor R4. One end of resistor R4 is connected to the other end of the voltage regulation and current limiting unit and the TRI pin of the NE555 chip, and the other end of resistor R4 is grounded.

[0011] Optionally, when the alarm unit is diode LED1, the positive terminal of diode LED1 is connected to the OUT pin of chip NE555, and the negative terminal of diode LED1 is connected to one end of the protection unit. When the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls diode LED1 to light up as an alarm. When the alarm unit is an SMS sending module, when the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls the SMS sending module to send an alarm SMS. When the alarm unit is an audible alarm module, when the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls the audible alarm module to sound an alarm.

[0012] The protection unit includes a resistor R5, one end of which is connected to the other end of the alarm unit, and the other end of the resistor R5 is grounded.

[0013] The beneficial effects of this application are: it enables the monitoring and alarm of the working voltage of the atmospheric transilluminator, especially when the monitored working voltage is lower than the voltage alarm threshold, the monitoring circuit can respond with multiple alarm modes to issue an alarm. Attached Figure Description

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

[0015] Figure 1 This utility model relates to a voltage monitoring and alarm circuit diagram for an atmospheric transmissometer transmitter. Detailed Implementation

[0016] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0017] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Example 1

[0019] An atmospheric transilluminator transmitter voltage monitoring and alarm circuit includes a voltage divider unit, a voltage regulation and current limiting unit, a filter unit, an NE555 chip, an auxiliary adjustment unit, an alarm unit, and a protection unit. One end of the voltage divider unit is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of the voltage divider unit is connected to one end of the voltage regulation and current limiting unit. The other end of the voltage regulation and current limiting unit is connected to the THR pin and the TRI pin of the NE555 chip, respectively. One end of the auxiliary adjustment unit is connected to the other end of the voltage regulation and current limiting unit and the TRI pin of the NE555 chip, respectively. One end of the alarm unit is connected to the OUT pin of the NE555 chip, one end of the filter unit is connected to the CON pin of the NE555 chip, the VCC pin of the NE555 chip is connected to the positive terminal of the power supply, and the other end of the alarm unit is connected to one end of the protection unit. When the voltage at the monitored terminal of the atmospheric transilluminator is lower than the voltage alarm threshold, the NE555 chip controls the alarm unit to issue an alarm.

[0020] The voltage divider unit includes resistors R1 and R2. One end of resistor R1 is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of resistor R1 is connected to one end of resistor R2 and one end of the voltage stabilization and current limiting unit. The other end of resistor R2 is grounded.

[0021] The voltage regulation and current limiting unit includes a Zener diode D1 and a resistor R3. The positive terminal of Zener diode D1 is connected to one end of resistor R3 and the other end of the voltage divider unit. The negative terminal of Zener diode D1 is connected to the TRI pin of the NE555 chip and one end of the auxiliary adjustment unit. The other end of resistor R3 is connected to the THR pin of the NE555 chip. It should be noted that resistor R3, in conjunction with Zener diode D1, limits the current flowing through Zener diode D2. When the voltage at the atmospheric transilluminator monitoring terminal is divided by resistors R1 and R2, the higher voltage is applied across Zener diode D2. Resistor R3 limits the current, preventing damage to Zener diode D2 due to excessive current and ensuring that Zener diode D2 operates stably in a regulated state.

[0022] For example, the voltage at the monitored end of the atmospheric transilluminator is 24V. After being regulated by the Zener diode D1, it provides voltage to the THR and TRI pins of the NE555 chip. When the voltage at the THR pin is higher than 6.2V, which is higher than 2 / 3 of the VCC of the NE555 chip (approximately 3.33V), and the voltage at the TRI pin is also 6.2V, which is higher than 1 / 3 of the VCC of the NE555 chip (approximately 1.67V), the OUT pin of the NE555 chip outputs a low level. At this time, there is not enough forward voltage difference across LED1, and LED1 does not light up, indicating that the operating voltage of the monitored atmospheric transilluminator LT31 transmitter is normal, and no alarm is generated.

[0023] The filtering unit includes capacitor C1. One end of capacitor C1 is connected to the CON pin of the NE555 chip, and the other end of capacitor C1 is grounded. Capacitor C1 is used to eliminate high-frequency interference and stabilize the voltage of the CON pin, thereby stabilizing the reference voltage of the internal comparator of the NE555 chip and ensuring stable chip operation.

[0024] The auxiliary adjustment unit includes resistor R4. One end of resistor R4 is connected to the other end of the voltage regulation and current limiting unit and the TRI pin of the NE555 chip, while the other end of resistor R4 is grounded. Resistor R4 mainly serves as an auxiliary element, such as voltage divider or providing appropriate impedance matching for the circuit. It is related to the control voltage input function of the NE555 chip. Specifically, resistor R4, in conjunction with capacitor C1, can attenuate high-frequency interference signals in the circuit related to the control voltage pin (CON) of the NE555 chip without significantly affecting the normal operating voltage of the NE555 chip.

[0025] Optionally, the alarm unit can be diode LED1. The positive terminal of diode LED1 is connected to the OUT pin of chip NE555, and the negative terminal of diode LED1 is connected to one end of the protection unit. When the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls diode LED1 to light up as an alarm; conversely, chip NE555 controls diode LED1 to remain off (no alarm). The alarm unit can also be an SMS sending module. When the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls the SMS sending module to send an alarm SMS. Alternatively, the alarm unit can be an audible alarm module. When the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls the audible alarm module to sound an alarm.

[0026] The protection unit includes a resistor R5, one end of which is connected to the other end of the alarm unit, and the other end of the resistor R5 is grounded. Resistor R5 is used to limit the current passing through the alarm unit to prevent the alarm unit from being damaged due to excessive current.

[0027] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0028] The terms "first," "second," and "third," etc., used in this application's specification and the foregoing drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A voltage monitoring and alarm circuit for an atmospheric transmissometer transmitter, characterized in that, The system includes a voltage divider unit, a voltage regulator and current limiter unit, a filter unit, an NE555 chip, an auxiliary adjustment unit, an alarm unit, and a protection unit. One end of the voltage divider unit is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of the voltage divider unit is connected to one end of the voltage regulator and current limiter unit. The other end of the voltage regulator and current limiter unit is connected to the THR pin and the TRI pin of the NE555 chip, respectively. One end of the auxiliary adjustment unit is connected to the other end of the voltage regulator and current limiter unit and the TRI pin of the NE555 chip, respectively. One end of the alarm unit is connected to the OUT pin of the NE555 chip, one end of the filter unit is connected to the CON pin of the NE555 chip, the VCC pin of the NE555 chip is connected to the positive terminal of the power supply, and the other end of the alarm unit is connected to one end of the protection unit. When the voltage at the monitoring terminal of the atmospheric transilluminator is lower than the voltage alarm threshold, the NE555 chip controls the alarm unit to issue an alarm.

2. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, The voltage divider unit includes resistors R1 and R2. One end of resistor R1 is connected to the voltage monitoring terminal of the atmospheric transilluminator, and the other end of resistor R1 is connected to one end of resistor R2 and one end of the voltage stabilization and current limiting unit. The other end of resistor R2 is grounded.

3. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, The voltage regulation and current limiting unit includes a Zener diode D1 and a resistor R3. The positive terminal of the Zener diode D1 is connected to one end of the resistor R3 and the other end of the voltage divider unit, respectively. The negative terminal of the Zener diode D1 is connected to the TRI pin of the NE555 chip and one end of the auxiliary adjustment unit, respectively. The other end of the resistor R3 is connected to the THR pin of the NE555 chip.

4. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, The filtering unit includes a capacitor C1, one end of which is connected to the CON pin of the NE555 chip, and the other end of which is grounded.

5. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, The auxiliary adjustment unit includes a resistor R4. One end of the resistor R4 is connected to the other end of the voltage regulation and current limiting unit and the TRI pin of the NE555 chip, and the other end of the resistor R4 is grounded.

6. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, The protection unit includes a resistor R5, one end of which is connected to the other end of the alarm unit, and the other end of the resistor R5 is grounded.

7. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, When the alarm unit is diode LED1, the positive terminal of diode LED1 is connected to the OUT pin of chip NE555, and the negative terminal of diode LED1 is connected to one end of the protection unit. When the voltage of the monitored atmospheric transilluminator is lower than the voltage alarm threshold, chip NE555 controls diode LED1 to light up to issue an alarm.

8. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, When the alarm unit is an SMS sending module, if the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, the NE555 chip controls the SMS sending module to send an alarm SMS to issue an alarm.

9. The atmospheric transmissometer transmitter voltage monitoring and alarm circuit according to claim 1, characterized in that, When the alarm unit is an audible alarm module, if the voltage at the monitored end of the atmospheric transilluminator is lower than the voltage alarm threshold, the NE555 chip controls the audible alarm module to issue an alarm.

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