Water level early warning device based on city street lamp power supply safety

Abstract

The utility model provides a water level early warning device based on city street lamp power supply safety. The water level early warning device comprises a charging and discharging device, a lithium battery, a voltage stabilizing circuit, a data processing and control circuit, a pressure type liquid level sensor device and a communication device. The charging and discharging device is connected with the lithium battery and the voltage stabilizing circuit, the voltage stabilizing circuit is connected with the data processing and control circuit, and the data processing and control circuit is connected with the pressure type liquid level sensor device and the communication device. Power supply is mainly achieved through the lithium battery, power supply is assisted through the solar panel, influence of power supply of the lamp pole is avoided, pipe laying and wiring are not needed, safety is higher, and the endurance time is longer.

Description

Technical Field

[0001] The utility model relates to the field of municipal early warning devices, and in particular to a water level early warning device based on the power supply safety of urban street lamps. Background Art

[0002] Most cities in my country are located in subtropical and temperate zones, with abundant rainfall in summer and autumn. When there is continuous rain, low-lying areas in cities experience severe waterlogging. Furthermore, due to outdated urban drainage systems, heavy rains can lead to poor drainage, resulting in road flooding and threatening public safety. In particular, electric shock accidents are common when rainwater floods streetlights. The following are existing water level monitoring solutions:

[0003] 1. Use cameras to monitor water levels in low-lying sections of road: Floating water level gauges are installed on low-lying roads and underpasses. Cameras monitor the float at the bottom of the gauge. When water accumulates, the float moves up and down with the water level, allowing monitoring of the water level. However, this solution requires the installation and deployment of monitoring equipment and the laying of pipes and cables to power the equipment, which is costly, and the power cables themselves carry the risk of electrical leakage.

[0004] 2. Electronic Water Gauge: An electronic water gauge is installed on the roadside. When water reaches a certain point on the gauge, the electrodes are triggered to conduct, thereby determining the water level. The water level data is then transmitted to a monitoring center or related software platform via wired or wireless communication. However, this solution suffers from the lithium battery power supply, which has a short battery life. Furthermore, the data processing and communication circuit modules require a waterproof design, typically encapsulated with glue, making battery replacement difficult and ultimately depleting every 2–3 years. Furthermore, the gauge electrodes are prone to clogging, requiring cleaning every six months, resulting in high maintenance costs.

[0005] 3. Ultrasonic water level measurement: The sensor is installed above the water surface to be measured. When powered on, the sensor emits ultrasonic pulses, which pass through the air and reach the water surface before being reflected back. Part of the reflected echo is received by the same sensor and converted into an electrical signal, from which the water level is calculated. This method is mainly suitable for water level measurement in rivers, lakes, reservoirs, estuaries, and channels. If used for road water level measurement, it is easily affected by vehicles or pedestrians stopping by, resulting in false alarms. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the present utility model is to provide a water level early warning device based on the power supply safety of urban street lamps.

[0007] According to the utility model, a water level early warning device based on the power supply safety of urban street lamps is provided, which includes: a charging and discharging device, a lithium battery, a voltage stabilizing circuit, a data processing and control circuit, a pressure type liquid level sensor device and a communication device;

[0008] The charging and discharging device is connected to the lithium battery and the voltage stabilizing circuit, the voltage stabilizing circuit is connected to the data processing and control circuit, and the data processing and control circuit is connected to the pressure type liquid level sensor device and the communication device.

[0009] Preferably, the charging and discharging device comprises: a solar panel and a lithium battery charging and discharging circuit;

[0010] The solar panel is connected to a lithium battery charging and discharging circuit, and the lithium battery charging and discharging circuit is connected to the lithium battery and a voltage stabilizing circuit.

[0011] Preferably, the communication device includes: an NB-IOT communication circuit and an RS485 communication circuit;

[0012] The data processing and control circuit is connected to the NB-IOT communication circuit and / or the RS485 communication circuit.

[0013] Preferably, the NB-IOT communication circuit signal is connected to a street lighting monitoring center.

[0014] Preferably, the RS485 communication circuit is connected to a lighting monitoring terminal or a municipal intelligent terminal of a street light distribution box.

[0015] Preferably, the pressure-type liquid level sensor device is installed at the inspection port of a street lamp pole, and the lower part of the pressure-type liquid level sensor device is 10-20 cm above the ground.

[0016] Preferably, the pressure type liquid level sensor device is packaged with a stainless steel mesh.

[0017] Preferably, a discharge protection circuit is provided in the lithium battery charge and discharge circuit.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This application provides a water level warning device based on the safety of street lamp power supply, which uses a pressure-type liquid level sensor device and is not easily affected by the road environment and is not prone to clogging;

[0020] 2. The power supply of this application is mainly lithium batteries and supplemented by solar panels. There is no need to pull wires from the inside of the lamp pole to supply power, but lithium batteries are used. The power replenished by the solar panels every day can be sufficient to cover the daily power consumption of the device and can charge the lithium batteries, which solves the power supply safety problem of outdoor equipment and has a longer battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0022] Figure 1This is the schematic diagram of the water level warning device;

[0023] Figure 2 This is the working principle diagram of the lithium battery charging and discharging circuit;

[0024] As shown in the figure:

[0025]

[0026] DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.

[0028] like Figure 1 As shown, this embodiment primarily comprises a solar panel 1, a lithium battery charging and discharging circuit 2, a lithium battery 3, a voltage stabilizing circuit 4, a data processing and control circuit 5, a pressure-type liquid level sensor 6, an NB-IOT communication circuit 7, and an RS485 communication circuit 8. The solar panel 1 charges the lithium battery 3 via the lithium battery charging and discharging circuit 2. The lithium battery 3 outputs a voltage of 3-4.2V depending on the remaining charge. The voltage stabilizing circuit 4 uses a step-up / step-down conversion to provide a stable 3.3V output to power the data processing and control circuit 5. This embodiment uses a pressure-type liquid level sensor 6 to collect water depth information and transmit it to the data processing and control circuit 5 for A / D conversion, which converts it into the actual water level. When the water level exceeds the set alarm limit, the NB-IOT communication circuit 7 immediately transmits the alarm water level information to the street lighting monitoring center, which then sends a command to the lighting monitoring terminal to disconnect the power supply circuit for the corresponding road, thereby ensuring the safety of pedestrians wading through water and preventing electric shock. This embodiment also has an RS485 communication circuit 8 interface, which can also communicate directly with the lighting monitoring terminal or other municipal equipment terminals in the road distribution box to implement equipment linkage or on-site alarms for excessive water accumulation. This embodiment adopts a low-power design. When the road surface is normal and there is no water accumulation, it is in a dormant state. Once water is detected, it can be activated and actively report the water level value, thereby ensuring a longer battery life.

[0029] Specifically, solar panel 1 is connected to lithium battery charge and discharge circuit 2, which is in turn connected to lithium battery 3 and voltage stabilization circuit 4. Solar panel 1 can be configured with a variety of voltage specifications within the 5V-24V output voltage range, and the power of solar panel 1 is 5W. Lithium battery charge and discharge circuit 2 supports a wide voltage input range of 5V-24V, making it compatible with solar panels 1 with various output voltage specifications. Lithium battery charge and discharge circuit 2 supports three charging modes: trickle current, constant current, and constant voltage. The circuit can charge in these three modes by detecting the voltage of lithium battery 3. This circuit sets the maximum sampling current to 1.2A via the current sampling resistor of the charging control chip. In constant current mode, lithium battery 3 can be charged at the maximum current, with a charging voltage of 4.2V and a charging power of 5W. The lithium battery charge and discharge circuit 2 has a discharge protection function. The discharge voltage of a fully charged lithium battery 3 is 4.2V. As the lithium battery 3 discharges, the power level decreases, and the output voltage gradually decreases. When the output voltage of the lithium battery 3 falls below 3V, the MOS transistor in the discharge circuit shuts off, thereby protecting the lithium battery 3 from over-discharge. In this embodiment, the selected lithium battery is a 4.2V, 12000mAH lithium battery. The lithium battery charge and discharge circuit 2 is connected to the voltage regulator circuit 4. The output voltage of the lithium battery charge and discharge circuit 2 is 3V-4.2V, that is, the input voltage of the voltage regulator circuit 4 is 3V-4.2V.

[0030] The lithium battery 3 is connected to the data processing and control circuit 5 via the voltage stabilizing circuit 4. The operating voltage of the data processing and control circuit 5 is 3.3V. This voltage must be stable, otherwise it will cause the main control chip to reset and IO port level logic errors. The data processing and control circuit 5 is connected to the pressure-type liquid level sensor device 6 and the communication device. In this embodiment, the voltage stabilizing circuit 4 adopts a Buck-Boost conversion circuit topology. The output voltage of this circuit topology can be lower than or higher than the input voltage, which is called a buck-boost circuit. By setting the feedback resistor voltage divider value of the circuit control chip, a stable output voltage can be obtained. When the output voltage of the lithium battery charge and discharge circuit 2 varies between 3V and 4.2V, the circuit control chip of the voltage stabilizing circuit 4 automatically adjusts the PWM output duty cycle according to the voltage divider value of the feedback pin, controlling the opening and closing of the MOS tube in the control loop, thereby controlling the output voltage of the circuit to a stable 3.3V.

[0031] The data processing and control circuit 5, consisting of a main control chip MCU and its peripheral configuration circuits, can calculate the current water level value based on the water level information detected by the pressure-type liquid level sensor device 6, determine whether the value exceeds the preset alarm value, and transmit the current water level data or alarm information via the NB-IOT communication circuit 7 or RS485 communication circuit 8. The data processing and control circuit 5 can also receive information such as alarm thresholds, sampling periods, and heartbeat periods from the lighting monitoring platform or other intelligent terminals via the NB-IOT communication circuit 7 or RS485 communication circuit 8, facilitating the modification of the device's operating parameters. The data processing and control circuit 5 can control the pressure-type liquid level sensor device 6 to automatically sample water level information according to the set sampling period, calculate the water level value, and compare it with the set warning value. If the warning value is exceeded, it is immediately reported via the NB-IOT communication circuit 7 or RS485 communication circuit 8 until the next sampled water level value falls below the warning value, and the alarm disappears. If the sampled water level value falls below the warning value, there is no alarm, and the device automatically enters a dormant state until it wakes up at the next sampling cycle and begins a new sampling cycle.

[0032] The pressure-type liquid level sensor device 6 is connected to the data processing and control circuit 5. The pressure-type liquid level sensor used is a voltage-type liquid level sensor. The output signal is 0.5V-2.5VDC. The voltage value is linearly related to the range, that is, 0.5V corresponds to zero liquid level and 2.5V corresponds to full-scale liquid level. The voltage signal output by the pressure-type liquid level sensor is filtered by the data processing and control circuit and then converted into a digital signal by AD. The current water level value is calculated according to the linear proportional relationship. In this embodiment, the pressure-type liquid level sensor device 6 uses a voltage-type liquid level sensor, which has lower power consumption than the current-type sensor currently on the market, reduces the power consumption of the entire device, and is more suitable for low-power application scenarios powered by lithium batteries 3. The pressure-type liquid level sensor device 6 is encapsulated with a 100-mesh 0.08mm 304 stainless steel mesh to prevent the intrusion of leaves, debris, etc., and avoid sensor blockage. In one embodiment, electric leakage of lighting poles due to water accumulation on the road mainly occurs at the connection between the incoming cable of the lamp pole inspection port and the lamp cable. Therefore, a water level warning device can be installed 10-20 cm from the ground below the inspection port of the lamp pole. Once the water accumulation on the road is about to submerge the inspection port, the water level warning device will immediately and actively report the water level warning information and send it to the street light lighting control center through the operator's base station. After receiving the alarm information, the street light lighting control center can immediately send a command to the lighting control terminal to disconnect the power supply of the corresponding lighting circuit according to the warning level, thereby eliminating the risk of electric shock to pedestrians wading through water.

[0033] The communication device includes an NB-IOT communication circuit 7 and an RS485 communication circuit 8. The data processing and control circuit 5 is connected to the NB-IOT communication circuit 7 and / or the RS485 communication circuit 8. In the wireless signal transmission method using an IoT card, the NB-IOT communication circuit 7 signals are connected to the streetlight lighting monitoring center. In another signal transmission method, the RS485 communication circuit 8 is connected to the lighting monitoring terminal in the streetlight distribution box or other municipal smart terminal. The NB-IOT communication circuit 7 can support IoT card communication from the three major operators. It transmits on-site water level alarm data to the city streetlight lighting monitoring center management platform via a nearby operator base station. The management platform can determine the severity of on-site waterlogging based on this water level alarm data and disconnect the corresponding streetlight power supply circuit via the streetlight monitoring terminal. The RS485 communication circuit 8 can be connected to the lighting monitoring terminal in the streetlight distribution box or other smart terminal device. When connected to the streetlight lighting monitoring terminal, the lighting monitoring terminal can directly disconnect the on-site streetlight power supply circuit based on the water level over-limit warning value sent by the water level warning device. When connected to other municipal terminal devices, linked control or warning functions can also be implemented.

[0034] like Figure 2As shown, the device of this embodiment operates in sleep mode most of the time. If it relies solely on the power of the lithium battery 3 itself (about 12000mAh), it can maintain operation for about three years. However, in actual operation, the solar panel 1 can output a voltage in the range of 5-24V, and the lithium battery 3 is charged through the lithium battery charge and discharge circuit 2. The lithium battery charge and discharge circuit 2 can monitor the output voltage of the lithium battery 3 and has three charging modes depending on the monitored voltage: when the monitored voltage of the lithium battery 3 is lower than 2.8V, trickle charging (pre-charging) is performed, and the charging current is one-tenth of the set current (constant current). The constant current is set by the 120mV reference voltage and a current sampling resistor R inside the charging control chip, that is, the charging current is 120mV / R. When the monitored voltage of the lithium battery 3 is greater than 2.8V, the standard charging process is entered, that is, the constant current charging mode. In this mode, the circuit charges the lithium battery 3 with the maximum charging current. The lithium battery charge and discharge circuit 2 also features an MPPT control function (i.e., a "maximum power point tracking" solar controller). In constant current charging mode, when the current output capacity of the solar panel 1 decreases, the lithium battery charge and discharge circuit 2 tracks the maximum power point of the solar panel 1, always supplying power to the lithium battery 3 at the current maximum power of the solar panel 1, thereby maximizing the output power of the solar panel 1. When the voltage of the lithium battery 3 continues to rise and approaches 4.2V, the lithium battery charge and discharge circuit 2 enters constant voltage charging mode, gradually reducing the charging current. Charging ends when the charging current decreases to 16% of the constant current charging current, at which point the charging circuit is shut off and the charging current reaches zero. When the voltage of the lithium battery 3 gradually decreases to 95.5% of the constant voltage charging voltage, it automatically enters constant current charging mode and begins a new charging cycle, ensuring that the charge level of the lithium battery 3 remains above 80%.

[0035] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A water level warning device based on the power supply safety of urban street lamps, characterized in that: include: A charging and discharging device, a lithium battery (3), a voltage stabilizing circuit (4), a data processing and control circuit (5), a pressure-type liquid level sensor device (6), and a communication device; The charging and discharging device is connected to a lithium battery (3) and a voltage stabilizing circuit (4); the voltage stabilizing circuit (4) is connected to a data processing and control circuit (5); and the data processing and control circuit (5) is connected to a pressure-type liquid level sensor device (6) and a communication device.

2. A water level warning device based on urban street lamp power supply safety according to claim 1, characterized in that: The charging and discharging device comprises: a solar panel (1) and a lithium battery charging and discharging circuit (2); The solar panel (1) is connected to a lithium battery charging and discharging circuit (2), and the lithium battery charging and discharging circuit (2) is connected to the lithium battery (3) and a voltage stabilizing circuit (4).

3. A water level warning device based on urban street lamp power supply safety according to claim 1, characterized in that: The communication device comprises: an NB-IOT communication circuit (7) and an RS485 communication circuit (8); The data processing and control circuit (5) is connected to the NB-IOT communication circuit (7) and / or the RS485 communication circuit (8).

4. The water level warning device based on urban street lamp power supply safety according to claim 3, characterized in that: The NB-IOT communication circuit (7) is connected to the street lighting monitoring center via a signal.

5. The water level warning device based on urban street lamp power supply safety according to claim 3, characterized in that: The RS485 communication circuit (8) is connected to the lighting monitoring terminal of the street light distribution box or the municipal intelligent terminal.

6. The water level warning device based on urban street lamp power supply safety according to claim 1, characterized in that: The pressure-type liquid level sensor device (6) is installed at the inspection port of the street lamp pole, and the lower part of the pressure-type liquid level sensor device (6) is 10-20 cm away from the ground.

7. The water level warning device based on urban street lamp power supply safety according to claim 1, characterized in that: The pressure type liquid level sensor device (6) is packaged using a stainless steel mesh.

8. The water level warning device based on urban street lamp power supply safety according to claim 2, characterized in that: A discharge protection circuit is provided in the lithium battery charge and discharge circuit (2).

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