Single lamp monitoring device and lamp box assembly

Abstract

The utility model discloses a single lamp monitoring device and a lamp box assembly. The single lamp monitoring device comprises: an insulating casing; the non-free ends of the water inlet detection probes are located in the insulating machine shell, the free ends of the water inlet detection probes penetrate out of the insulating machine shell, and the same pair of water inlet detection probes are arranged at intervals; the one or more conversion circuits are arranged in the insulating machine shell, connected with the water inlet detection probes in a one-to-one correspondence mode and used for converting the resistance value state between the same pair of water inlet detection probes into voltage signals; the micro-control unit is arranged in the insulating machine shell, and a voltage detection terminal of the micro-control unit is connected with the conversion circuit; and the communication circuit is arranged in the insulating casing, is connected with the micro-control unit and is used for communicating with external equipment of the single-lamp monitoring device. Water inflow of the lamp box can be automatically monitored, and the improvement cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to a single lamp monitoring device and lamp box assembly. BACKGROUND

[0002] The lamp box of the airport approach light is buried in the ground at the soil area outside the runway and taxiway. The lamp box is a closed box body for installing an isolation transformer, a single lamp monitoring device and other equipment. The single lamp monitoring device is used for controlling the lamp outside the lamp box. The lamp is usually buried at the center line of the runway and taxiway. Since the primary side of the isolation transformer is a high-voltage end with a maximum voltage of 4500V, if the lamp box is waterlogged, the insulation of the primary connector will be reduced, thereby causing the risk of electric shock near the lamp box and causing the approach light circuit function to decline or fail to work.

[0003] For example, CN116915285B discloses a lamp monitoring system, which comprises a constant-current power supply, a first series branch, a communication host, a plurality of monitors (i.e. single lamp monitoring devices) and a plurality of lamps. In an actual airport, each monitor and the corresponding transformer (i.e. isolation transformer) are placed in the same lamp box. The lamp corresponding to each monitor is located outside the corresponding lamp box.

[0004] Each single lamp monitoring device in each lamp box controls one approach light lamp. Generally, there are tens of thousands of lamp boxes in each airport, and manual inspection cannot be used to check whether the lamp box is waterlogged. At present, there is no effective means to remotely monitor whether the lamp box is waterlogged, and only when the insulation of the primary side of the light circuit is reduced and a fault occurs, can it be detected whether the lamp box in the circuit is waterlogged and the insulation is reduced, and then maintenance is performed. INVENTION CONTENTS

[0005] The utility model provides a single lamp monitoring device and lamp box assembly to realize automatic detection of waterlogging of the lamp box.

[0006] The utility model provides a single lamp monitoring device, which comprises:

[0007] An insulating shell;

[0008] One or more pairs of waterlogging detection probes, the non-free end of the waterlogging detection probe being located in the insulating shell, the free end of the waterlogging detection probe penetrating out of the insulating shell, and the same pair of waterlogging detection probes being arranged at a distance from each other;

[0009] One or more conversion circuits arranged in the insulating shell and connected to the waterlogging detection probes one by one, for converting the resistance state between the same pair of waterlogging detection probes into a voltage signal;

[0010] A micro control unit arranged in the insulating shell, the voltage detection terminal of the micro control unit being connected to the conversion circuit;

[0011] A communication circuit is arranged in the insulating casing and connected to the micro control unit, and is used for communicating with external equipment of the single lamp monitoring device.

[0012] In some embodiments, the distance between the same pair of water inlet detection probes is denoted as d, and 0.5 cm≤d≤2 cm is satisfied.

[0013] In some embodiments, the insulating casing is in the shape of a cuboid as a whole, the ratio of the length and the width of the insulating casing is greater than or equal to 1 and less than or equal to 2, the ratio of the width and the height of the insulating casing is greater than or equal to 3, two surfaces defined by the length direction and the width direction of the insulating casing are the front surface and the back surface, the remaining four surfaces of the insulating casing are the side surfaces thereof, and the same pair of water inlet detection probes are located on the same side surface.

[0014] In some embodiments, the side surface of the insulating casing provided with the water inlet detection probes has an inner recess section, the water inlet detection probes are located at the inner recess section, and the free ends of the water inlet detection probes do not exceed the opening of the inner recess section.

[0015] In some embodiments, the conversion circuit comprises a voltage dividing resistor and a voltage amplification circuit, the first end of the voltage dividing resistor is connected to the first direct current power supply end, the second end of the voltage dividing resistor is connected to the non-free end of the corresponding water inlet detection probe, the non-free end of the other water inlet detection probe is connected to the second direct current power supply end, the voltage amplification circuit amplifies the voltage between the two ends of the voltage dividing resistor or the voltage between the non-free ends of the corresponding pair of water inlet detection probes, and the output end of the voltage amplification circuit is connected to the voltage detection terminal of the micro control unit.

[0016] In some embodiments, the communication circuit is a power line carrier communication circuit or a wireless communication circuit.

[0017] In some embodiments, the timer PWM output pin of the micro control unit is connected to the communication circuit.

[0018] In some embodiments, the insulating casing is filled with sealant.

[0019] The utility model provides a lamp box assembly, comprising:

[0020] Sealed box body;

[0021] The aforementioned single lamp monitoring device is arranged in the sealed box body;

[0022] Isolation transformer is arranged in the sealed box body;

[0023] A pair of primary side cables, the first end of which is connected to the isolation transformer, and the second end of which extends out of the sealed enclosure;

[0024] A pair of secondary side cables, the first end of which is connected to the isolation transformer, and the second end of which is connected to the single-lamp monitoring device;

[0025] One or more pairs of drive wires, the first end of which is connected to the single lamp monitoring device, and the second end of which passes through the sealed housing and is used to connect to the lamp.

[0026] In some embodiments, the primary connector of the isolation transformer is not lower than the free end of any one of the water ingress detection probes of the single-lamp monitoring device.

[0027] In some embodiments, the single-lamp monitoring device is fixed to the bottom of the sealed enclosure.

[0028] The single-lamp monitoring device is placed inside a sealed enclosure (i.e., the lamp box). Under normal circumstances, the same pair of water ingress detection probes exhibit a high resistance state. If the seal of the enclosure fails and water enters, the same pair of water ingress detection probes will be immersed in water, exhibiting a low resistance state. The conversion circuit converts the resistance state between the same pair of water ingress detection probes into a voltage signal. The microcontroller unit can then determine whether the same pair of water ingress detection probes are immersed in water by measuring the voltage signal. Once the resistance between the same pair of water ingress detection probes falls below a set threshold, the microcontroller unit can send an early warning to external devices via the communication circuit, enabling efficient and timely handling of water ingress faults in the lamp box. Furthermore, the modification cost of this single-lamp monitoring device is low. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of the light box assembly of this utility model.

[0030] Figure 2 This is a circuit diagram of the status monitoring circuit of the single-lamp monitoring device according to an embodiment of the present invention.

[0031] Figure 3 This is a structural schematic diagram of the light box assembly according to an embodiment of the present utility model.

[0032] Figure 4 This is a schematic diagram of the structure of a lightbox assembly according to another embodiment of the present invention.

[0033] The attached diagram is labeled as follows: 1. Sealed enclosure; 2. Isolation transformer; 3. Single lamp monitoring device; L1, L2, primary side cables; L3, L4, secondary side cables; L5, L6, drive lines; VCC, DC power supply terminal; P1, P2, water ingress detection probes; A, voltage amplification circuit; T, conversion circuit; M, microcontroller unit; C, communication circuit; J1, J2, connectors; J3, primary connector; R, voltage divider resistor. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0035] This utility model provides a single-lamp monitoring device, comprising:

[0036] Insulated housing;

[0037] One or more pairs of water ingress detection probes, with the non-free ends of the water ingress detection probes located inside the insulating housing and the free ends of the water ingress detection probes extending out of the insulating housing, and the same pair of water ingress detection probes being spaced apart from each other;

[0038] One or more conversion circuits are disposed inside the insulating housing and connected one-to-one with the water inlet detection probes, for converting the resistance state between the same pair of water inlet detection probes into a voltage signal.

[0039] A microcontroller unit is disposed inside the insulating housing, and the voltage detection terminal of the microcontroller unit is connected to the conversion circuit;

[0040] The communication circuit, housed within an insulated housing, is connected to the microcontroller unit and is used to communicate with external devices of the single-lamp monitoring device.

[0041] The insulating housing is, for example, a plastic housing. The insulating housing is, for example, a flat cubic shape. The edges of the insulating housing can be rounded to improve its structural stability. The shape of the insulating housing is not limited to this; for example, it can also be a truncated cone shape.

[0042] The water ingress detection probe is a needle-shaped, columnar, or other suitable conductor, such as a needle-shaped metal. This invention does not limit the specific shape of the water ingress detection probe. A through-hole is provided on the insulating housing for the water ingress detection probe to pass through. The water ingress detection probe and the through-hole on the insulating housing can be an interference fit. That is, the diameter of the area where the water ingress detection probe contacts the through-hole on the insulating housing is slightly larger than the diameter of the through-hole. Furthermore, the area where the water ingress detection probe contacts the insulating housing can be sealed with sealant.

[0043] A microcontroller unit (MCU) has a voltage detection terminal and built-in voltage detection circuitry, capable of measuring the voltage value of the terminal relative to ground. The MCU also has built-in output circuitry, enabling wired communication with communication circuitry. For example, the MCU may have a built-in timer that outputs a square wave of a specific waveform; in this case, the PWM output pin of the microcontroller's timer is connected to the communication circuitry. Suitable MCUs include STMicroelectronics' STM32L412, Texas Instruments' TMS320F28027, or NXP's S9KEAZ128AMLH.

[0044] A communication circuit, housed within the insulating housing and connected to the microcontroller unit, is used to communicate with external devices of the single-lamp monitoring device. The communication circuit can use wired communication (e.g., power line carrier communication) or wireless communication (e.g., 5G communication). This invention does not limit the circuit structure and operating principle of the communication circuit, and existing communication circuits for single-lamp monitoring devices can be used.

[0045] The connection between the microcontroller unit and the communication circuit is not limited to this; for example, they can be connected via a bus.

[0046] In some implementations, the communication circuit is a power line carrier communication circuit. For example, the timer PWM output pin of the microcontroller is connected to the power line carrier communication circuit.

[0047] In other implementations, the communication circuit is a 5G communication circuit.

[0048] In some implementations, the distance between the same pair of water inlet detection probes is denoted as d, satisfying 0.5cm≤d≤2cm. If the distance between the same pair of water inlet detection probes is too small, it is easy to trigger false alarms; if the distance is too large, the resistance value between the same pair of water inlet detection probes will fluctuate greatly when water is entering the system, which is not conducive to determining whether the water inlet detection probes are immersed in water.

[0049] Typically, if the resistance between the same pair of water inlet detection probes is greater than 10MΩ, it can be determined that the same pair of water inlet detection probes are not immersed in water; if the resistance is less than 100KΩ, it can be determined that the same pair of water inlet detection probes are immersed in water.

[0050] In some embodiments, the insulating housing is generally rectangular, the ratio of the length to the width of the insulating housing is greater than or equal to 1 and less than or equal to 2, the ratio of the width to the height of the insulating housing is greater than or equal to 3, the two surfaces defined by the length direction and the width direction of the insulating housing are the front and back, the remaining four surfaces of the insulating housing are its side surfaces, and the same pair of water ingress detection probes are located on the same side surface.

[0051] The conventional shape of the insulating housing of a single-lamp monitoring device is a flat, rectangular box. Modifying existing single-lamp monitoring devices involves adding a switching circuit to the circuit board, preferably located at the edge of the board, thus minimizing the cost of modification. Correspondingly, the water ingress detection probe passes through the side of the insulating housing, further reducing the cost of modifying the internal mechanical structure of the existing single-lamp monitoring device.

[0052] In other embodiments, the water ingress detection probe may also be located on the front or back of the insulating housing.

[0053] In some embodiments, the side of the insulating housing with the water ingress detection probe has a recessed section, the water ingress detection probe is located in the recessed section, and the free end of the water ingress detection probe does not extend beyond the opening of the recessed section.

[0054] This design reduces the risk of water ingress detection probes scratching users or other structures inside the light box.

[0055] The recessed section can extend to the front or back of the insulating housing, and the recessed section can also have a closed inner circumferential surface.

[0056] In other embodiments, the free end of the water ingress detection probe is located outside the smallest enclosing cube of the insulating housing. This design requires only drilling holes in the insulating housing, resulting in minimal changes to the overall structure compared to existing designs. For example, the free end of the water ingress detection probe can be shaped like a nail head.

[0057] In some embodiments, the conversion circuit includes a voltage divider resistor and a voltage amplifier circuit. The first end of the voltage divider resistor is connected to a first DC power supply terminal, the second end of the voltage divider resistor is connected to a non-free terminal of a corresponding water inlet detection probe, and the non-free terminal of the other water inlet detection probe is connected to a second DC power supply terminal. The voltage amplifier circuit amplifies the voltage across the voltage divider resistor or the voltage between the non-free terminals of a pair of corresponding water inlet detection probes. The output terminal of the voltage amplifier circuit is connected to the voltage detection terminal of the microcontroller unit.

[0058] A pair of water ingress detection probes can be equivalent to a variable resistor, which has a resistance that is either very small (e.g., less than 100KΩ) or very large (e.g., greater than 10MΩ). This equivalent variable resistor is connected in series with a voltage divider resistor. By detecting the voltage across the equivalent variable resistor or the voltage divider resistor, the resistance state of the equivalent variable resistor can be determined.

[0059] The first DC power supply terminal is, for example, a positive power supply terminal, and the second DC power supply terminal is, for example, DC ground. Or, the second DC power supply terminal is, for example, a positive power supply terminal, and the first DC power supply terminal is, for example, DC ground.

[0060] The amplification factor of a voltage amplifier circuit can be greater than 1, less than 1, or equal to 1. On the one hand, the voltage amplifier circuit plays an isolation role, and on the other hand, the voltage amplifier circuit can adjust the output voltage to the appropriate range of the voltage detection circuit.

[0061] Existing single-lamp monitoring devices all contain AC-to-DC power supply circuits to power low-voltage DC circuits such as microcontrollers. This positive power supply can be provided by the existing AC-to-DC power supply circuit of the single-lamp monitoring device.

[0062] In some implementations, the insulating housing is filled with sealant. The sealant serves to waterproof and protect the internal circuitry. Since the water ingress detection probe needs to penetrate the insulating housing, gaps can easily form between them. If water enters the lamp box, it can easily cause the circuitry within the single-lamp monitoring device to malfunction. Filling the insulating housing with sealant effectively protects the circuitry within the single-lamp monitoring device, improving reliability. The sealant can be epoxy resin, silicone sealant, polyurethane sealant, or polysulfide sealant.

[0063] The remaining circuitry within the single-lamp monitoring device can be designed according to existing technology. For example, the power supply circuitry within the single-lamp monitoring device. This invention does not limit this aspect.

[0064] This utility model further provides a lightbox assembly, including:

[0065] Sealed enclosure;

[0066] The aforementioned single-lamp monitoring device is housed inside a sealed enclosure;

[0067] The isolation transformer is housed within a sealed enclosure.

[0068] A pair of primary side cables, with the first end of the primary side cable connected to the isolation transformer and the second end of the primary side cable passing through the sealed enclosure;

[0069] A pair of secondary side cables, the first end of which is connected to the isolation transformer, and the second end of which is connected to the single-lamp monitoring device;

[0070] One or more pairs of drive wires, the first end of the drive wire is connected to the single lamp monitoring device, the second end of the drive wire passes through the sealed housing, and the second end of the drive wire is used to connect the lamp.

[0071] Waterproof glands are installed at the points where the primary side cables and drive wires exit the sealed enclosure. One waterproof gland is installed at the point where each primary side cable passes through the sealed enclosure. One waterproof gland is installed at the point where one or more drive wires are housed within the same cable (multiple drive wires within one cable) and passes through the sealed enclosure.

[0072] In some implementations, the primary connector of the isolation transformer is no lower than the free end of any one of the water ingress detection probes of the single-lamp monitoring device. The primary connector serves to connect the isolation transformer and the primary side cable.

[0073] With this setup, external equipment can detect water ingress into the sealed enclosure before the primary connector of the isolation transformer is submerged, allowing for timely maintenance.

[0074] Insulating pads can be used to elevate the isolation transformer and / or the single-lamp monitoring device.

[0075] In some implementations, the single-lamp monitoring device is fixed to the bottom of the sealed enclosure. For example, it is fixed to the bottom of the sealed enclosure by adhesive. Another example is by pressing it into place.

[0076] When the communication circuit is a power line carrier communication circuit, the sealed enclosure can be a metal enclosure. When the communication circuit is a 5G communication circuit, the sealed enclosure must have a sufficient area of ​​insulating material.

[0077] The sealed enclosure can consist of a barrel-shaped part and a lid, with the connection area between the lid and the barrel-shaped part sealed with glue.

[0078] Example 1

[0079] refer to Figure 2 and Figure 3 and combined Figure 1 Example 1 provides a single-lamp monitoring device, whose insulating housing is in the shape of a flat cube. Figure 1 and Figure 3 The front of the insulated housing of the single-lamp monitoring device is shown. Figure 1 The recessed section on the side of the insulating casing and the water ingress detection probe were overlooked.

[0080] The single-lamp monitoring device internally includes a power supply circuit, a microcontroller unit M, and a communication circuit C (specifically, a power line carrier communication circuit). The power supply circuit converts the alternating current (AC) from the secondary side of the isolation transformer into direct current (DC) to power the low-voltage DC circuit inside the single-lamp monitoring device. The low-voltage DC circuit includes a logic control circuit and a conversion circuit T. The communication circuit C is used for bidirectional communication with the lighting station, receiving lighting control commands from the lighting station and providing feedback on the lamp's operating status (e.g., on, off, or faulty). The microcontroller unit M processes and executes the control commands sent by the lighting station and also determines whether the single-lamp monitoring device is currently submerged in water.

[0081] During deployment, the communication circuit C inside the single-lamp monitoring device is connected to the first end of the secondary side cables L3 and L4 via connector J1. The second end of the secondary side cables L3 and L4 is connected to the secondary side of the isolation transformer 2. The single-lamp monitoring device is connected to the first end of the drive lines L5 and L6 via connector J2. The second end of the drive lines L5 and L6 is used to connect the lamp. The lamp has only one independently controlled light-emitting element, and correspondingly, there is a pair of drive lines.

[0082] The single-lamp monitoring device also includes three pairs of water ingress detection probes P1 and P2, respectively located on three sides other than the side of the insulating housing connected to connectors J1 and J2. Each of these three sides has a recessed section, with each pair of water ingress detection probes P1 and P2 located within one of these recessed sections, and the probes P1 and P2 not extending beyond the opening of the recessed section. The extension direction of the water ingress detection probes P1 and P2 is perpendicular to the plane defined by the side they are located on.

[0083] The non-free terminal of the water ingress detection probe P1 is connected to the power supply terminal VCC (a positive DC power supply terminal, i.e., the first DC power supply terminal mentioned earlier) through a voltage divider resistor R. The non-free terminal of the water ingress detection probe P2 is grounded (i.e., the second DC power supply terminal mentioned earlier). The voltage amplifier circuit A amplifies the voltage at the non-free terminal of the water ingress detection probe P1 and outputs it to the voltage detection terminal of the microcontroller unit M. If the microcontroller unit M determines that the voltage at the voltage detection terminal is low enough (i.e., indicating that the resistance between the same pair of water ingress detection probes P1 and P2 is small enough), it sends a warning signal to the lighting station through the communication circuit C.

[0084] The timer PWM output pin of the microprocessor unit M is connected to the communication circuit. The microcontroller unit M only reports to the external device through the communication circuit when it determines that a pair of water ingress detection probes are immersed in water.

[0085] The microcontroller unit M has multiple voltage detection terminals, each of which is connected to a conversion circuit.

[0086] Example 2

[0087] Except for the following technical features, the technical features of Example 2 are the same as those of Example 1: the number of water ingress detection probes P1 and P2 is a pair, which are set on the opposite side of the insulating housing to the side where the connectors J1 and J2 are located.

[0088] Example 3

[0089] Except for the following technical features, the technical features of Example 3 are the same as those of Example 1: the water ingress detection probes P1 and P2 extend beyond their respective sides, and each side is a complete plane without any recessed sections. The free ends of the water ingress detection probes P1 and P2 are nail-shaped, and the nail-shaped areas are in close contact with the side of the insulating housing.

[0090] Example 4

[0091] refer to Figures 1 to 3 Example 4 provides a light box assembly, including: a sealed housing 1; a single-lamp monitoring device 3 provided in Example 1, disposed within the sealed housing; an isolation transformer 2, disposed within the sealed housing 1; a pair of primary side cables L1 and L2, the first ends of which are connected to the isolation transformer 2 (specifically connected to the primary side connector J3 of the isolation transformer 2), and the second ends of which exit the sealed housing 1 through a waterproof gland (not shown); a pair of secondary side cables L3 and L4, the first ends of which are connected to the isolation transformer 2, and the second ends of which are connected to the single-lamp monitoring device 3; a pair of drive lines L5 and L6, the first ends of which are connected to the single-lamp monitoring device 3, and the second ends of which exit the sealed housing 1, and the second ends of which are used to connect to a lamp. The lamp contains one independently controlled light-emitting element.

[0092] The single-lamp monitoring device 3 is fixed to the bottom of the sealed box 1 with its connectors J1 and J2 facing upwards.

[0093] The isolation transformer 2 is naturally placed inside the sealed enclosure 1. The primary side connector J3 of the isolation transformer 2 is at approximately the same height as the free ends of the water ingress detection probes P1 and P2.

[0094] Example 5

[0095] Except for the following technical features, the technical features of Example 5 are the same as those of Example 4: The single lamp monitoring device 3 is placed naturally at the bottom of the sealed box 1 with its front facing upward. Specifically, the single lamp monitoring device 3 is raised by a pad (not shown), and the isolation transformer 2 is raised by another pad (not shown). The primary side connector of the isolation transformer 2 is higher than the free end of any water ingress detection probe P1 or P2 of the single lamp monitoring device 3.

[0096] Example 6

[0097] refer to Figure 4Except for the following technical features, the technical features of Embodiment 6 are the same as those of Embodiment 4: the single lamp monitoring device 3 is pasted on the bottom inner circumference of the sealed box 1 with the front horizontal orientation, and the isolation transformer 2 is raised by a pad (not shown), and the primary side connector J3 of the isolation transformer 2 is higher than the free end of any water inlet detection probe P1 or P2 of the single lamp monitoring device 3.

[0098] This utility model is not limited to the above-described embodiments. Any modifications, improvements, or substitutions that can be conceived by those skilled in the art without departing from the essential content of this utility model fall within the scope of this utility model.

Claims

1. A single-lamp monitoring device, characterized in that, include: Insulated housing; One or more pairs of water ingress detection probes, wherein the non-free ends of the water ingress detection probes are located inside the insulating housing, and the free ends of the water ingress detection probes protrude through the insulating housing, and the same pair of water ingress detection probes are spaced apart from each other; One or more conversion circuits are disposed inside the insulating housing and connected one-to-one with the water inlet detection probes, for converting the resistance state between the same pair of water inlet detection probes into a voltage signal. A microcontroller unit is disposed inside the insulating housing, and the voltage detection terminal of the microcontroller unit is connected to the conversion circuit; A communication circuit, housed within the insulating housing and connected to the microcontroller unit, is used to communicate with external devices of the single-lamp monitoring device.

2. The single-lamp monitoring device according to claim 1, characterized in that, The distance between the same pair of water inlet detection probes is denoted as d, which satisfies 0.5cm≤d≤2cm.

3. The single-lamp monitoring device according to claim 1, characterized in that, The insulating housing is generally rectangular in shape. The ratio of the length to the width of the insulating housing is greater than or equal to 1 and less than or equal to 2. The ratio of the width to the height of the insulating housing is greater than or equal to 3. The two surfaces defined by the length and width directions of the insulating housing are the front and back sides. The remaining four surfaces of the insulating housing are its side surfaces. The same pair of water ingress detection probes are located on the same side surface.

4. The single-lamp monitoring device according to claim 3, characterized in that, The insulating housing equipped with a water ingress detection probe has a recessed section on its side, the water ingress detection probe is located in the recessed section, and the free end of the water ingress detection probe does not extend beyond the opening of the recessed section.

5. The single-lamp monitoring device according to claim 1, characterized in that, The conversion circuit includes a voltage divider resistor and a voltage amplifier circuit. The first end of the voltage divider resistor is connected to a first DC power supply terminal, the second end of the voltage divider resistor is connected to a non-free terminal of a corresponding water inlet detection probe, and the non-free terminal of the other water inlet detection probe is connected to a second DC power supply terminal. The voltage amplifier circuit amplifies the voltage across the voltage divider resistor or the voltage between the non-free terminals of a pair of corresponding water inlet detection probes. The output terminal of the voltage amplifier circuit is connected to the voltage detection terminal of the microcontroller unit.

6. The single-lamp monitoring device according to claim 1, characterized in that, The communication circuit is a power line carrier communication circuit or a wireless communication circuit.

7. The single-lamp monitoring device according to claim 1, characterized in that, The insulating housing is filled with sealant.

8. The single-lamp monitoring device according to claim 1, characterized in that, The timer PWM output pin of the microcontroller is connected to the communication circuit.

9. A lightbox assembly, characterized in that, include: Sealed enclosure; The single-lamp monitoring device according to any one of claims 1 to 6 is disposed within the sealed enclosure; An isolation transformer is housed within the sealed enclosure. A pair of primary side cables, the first end of which is connected to the isolation transformer, and the second end of which extends out of the sealed enclosure; A pair of secondary side cables, the first end of which is connected to the isolation transformer, and the second end of which is connected to the single-lamp monitoring device; One or more pairs of drive wires, the first end of which is connected to the single lamp monitoring device, and the second end of which passes through the sealed housing and is used to connect to the lamp.

10. The lightbox assembly according to claim 9, characterized in that, The primary connector of the isolation transformer is no lower than the free end of any one of the water ingress detection probes of the single-lamp monitoring device.

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