A solar street light system and its control method that automatically switches to yellow light in rainy and foggy weather

Abstract

This application relates to the field of solar street light technology and discloses a solar street light system that automatically switches to yellow light in rainy and foggy weather. The system includes: a photovoltaic panel module, a charging and discharging module, an energy storage battery, a rain and fog sensor, a control module, an LED constant current drive circuit, and an LED output unit. The control module is connected to the charging and discharging module and the rain and fog sensor. The LED output unit includes a white LED light group and a yellow LED light group. The control module is electrically connected to both the white and yellow LED light groups via the LED constant current drive circuit. The energy storage battery supplies power to the control module and the rain and fog sensor, and discharges power to the LED constant current drive circuit and the LED output unit. This solar street light system automatically switches to yellow light in rainy and foggy weather according to a set control method, effectively improving the lighting range and visibility, reducing traffic accidents, ensuring the safety of pedestrians and vehicles, and improving the intelligence and ease of use of the street light.

Description

Technical Field

[0001] This invention relates to the field of solar street light technology, and in particular to a solar street light system and control method that automatically switches to yellow light in rainy or foggy weather. Background Technology

[0002] Traditional solar streetlights provide basic illumination under normal weather conditions, but in rainy or foggy weather, the increased moisture and particulate matter in the air severely hinder light propagation. White light is easily scattered in rain and fog, leading to a reduced illumination range and decreased visibility, posing safety hazards to pedestrians and vehicles. For example, Chinese patent application CN200720023077.6 discloses a small solar streetlight composed of a light source, circuit board, lamp post, and solar panels. The light source is an LED white light diode, the circuit board is a long, curved surface, designed with low power and a large elevation angle, and the lamp post is short and small. However, like traditional solar streetlights, this small solar streetlight uses an LED white light diode as its light source, and in rainy or foggy weather, the white light is easily scattered, leading to a reduced illumination range and decreased visibility, posing safety hazards to pedestrians and vehicles.

[0003] To address the aforementioned issues, while some streetlights on the market offer dimming capabilities, most cannot automatically and accurately switch light colors based on changes in rain and fog intensity, thus failing to effectively solve the lighting problem in rainy and foggy weather. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of the prior art and provide a solar street light system that automatically switches to yellow light in rainy and foggy weather, as well as a control method for implementing this solar street light system that automatically switches to yellow light in rainy and foggy weather.

[0005] To achieve the above objectives, the present invention adopts the following solution:

[0006] A solar street light system that automatically switches to yellow light in rainy or foggy weather includes:

[0007] Photovoltaic module, which generates electricity during the day;

[0008] Charge / discharge module, energy storage battery; the photovoltaic panel module is electrically connected to the energy storage battery through the charge / discharge module;

[0009] Rain and fog sensor, used to collect rain and fog intensity signals;

[0010] The control module is connected to the charging and discharging module and the rain and fog sensor respectively to output charging management commands and receive rain and fog intensity signals;

[0011] LED constant current drive circuit and LED output unit; the LED output unit includes LED white light group and LED yellow light group; the control module is electrically connected to the LED white light group and LED yellow light group respectively through the LED constant current drive circuit to control the conduction or cutoff of the LED white light group and LED yellow light group.

[0012] The energy storage battery supplies power to the control module and rain / fog sensor, and discharges power to the LED constant current drive circuit and LED output unit.

[0013] As described above, in a solar street light system that automatically switches to yellow light in rainy or foggy weather, the white light input terminal of the LED constant current drive circuit is electrically connected to the load output terminal of the charging and discharging module, the white light enable terminal of the LED constant current drive circuit is electrically connected to the low-level output terminal of the control module, and the LED white light group is electrically connected to the white light output terminal of the LED constant current drive circuit.

[0014] The yellow light input terminal of the LED constant current drive circuit is electrically connected to the load output terminal of the charging and discharging module, and the yellow light enable terminal of the LED constant current drive circuit is electrically connected to the high-level output terminal of the control module; the LED yellow light group is electrically connected to the yellow light output terminal of the LED constant current drive circuit.

[0015] The aforementioned solar street light system that automatically switches to yellow light in rainy and foggy weather also includes a photovoltaic panel detection unit for collecting photovoltaic panel voltage signals and a voltage and current sampling unit for collecting battery voltage signals; the control module is connected to the photovoltaic panel detection unit and the voltage and current sampling unit respectively to receive photovoltaic panel voltage signals and battery voltage signals; the energy storage battery supplies power to the photovoltaic panel detection unit and the voltage and current sampling unit.

[0016] As described above, a solar street light system that automatically switches to yellow light in rainy or foggy weather has a reverse connection protection module electrically connected between the photovoltaic panel module and the charging / discharging module; the reverse connection protection module is composed of a MOSFET reverse connection protection circuit or a diode reverse connection protection circuit.

[0017] As mentioned above, in a solar street light system that automatically switches to yellow light in rainy or foggy weather, the LED constant current drive circuit and the LED output unit are connected to an output short-circuit and open-circuit protection unit.

[0018] As mentioned above, a solar street light system that automatically switches to yellow light in rainy or foggy weather uses an infrared scattering rain and fog sensor or a humidity and light scattering composite sensor.

[0019] This invention also discloses a control method for a solar street light system that automatically switches to yellow light in rainy and foggy weather. This method utilizes the aforementioned solar street light system that automatically switches to yellow light in rainy and foggy weather, and includes the following steps:

[0020] Step 1: Receive the photovoltaic panel voltage signal collected by the photovoltaic panel detection unit;

[0021] Step 2: Make a judgment based on the photovoltaic panel voltage signal and the preset threshold of the light voltage;

[0022] When the photovoltaic panel voltage is greater than or equal to the preset threshold of light voltage, it is determined to be daytime mode and the LED output unit is turned off;

[0023] When the photovoltaic panel voltage is lower than the preset threshold of the light voltage, it is determined to be in night mode. A low-level signal is output to the LED constant current drive circuit, which controls the LED white light group to turn on the lighting and display white light by default.

[0024] Step 3: In night mode, receive the rain and fog intensity signal collected by the rain and fog sensor;

[0025] Step 4: Make a judgment based on the rain and fog intensity signal and the preset rain and fog threshold;

[0026] When the rain and fog intensity is less than the preset threshold, it is determined to be in white light illumination mode. A low-level signal is output to the LED constant current drive circuit to maintain the LED white light group to continue illuminating and displaying white light.

[0027] When the rain / fog intensity is equal to or greater than the preset rain / fog threshold, the control module starts its internal delay timer for a delay time t.

[0028] Step 5: If the rain / fog intensity remains equal to or greater than the preset rain / fog threshold within the delay time t, execute the switching action. If it is determined to be the yellow light illumination mode, output a high-level signal to the LED constant current drive circuit to control the LED yellow light group to turn on the illumination and display yellow light; otherwise, maintain the white light illumination mode and output a low-level signal to the LED constant current drive circuit to display white light.

[0029] In the control method of the solar street light system that automatically switches to yellow light in rainy and foggy weather, as described above, the delay time t in step three is 5-30s.

[0030] The control method for a solar street light system that automatically switches to yellow light in rainy or foggy weather, as described above, also includes:

[0031] Step 6: Receive the battery voltage signal acquired by the voltage and current sampling unit;

[0032] Step 7: Make a judgment based on the collected battery voltage signal and the low battery preset threshold;

[0033] When the battery voltage is below the low charge threshold, the LED white light group will continue to illuminate and display white light even if a rain or fog intensity signal is detected; or the LED yellow light group will only be lit intermittently.

[0034] As mentioned above, the control method for a solar street light system that automatically switches to yellow light in rainy or foggy weather involves an LED white light group with a color temperature of 5000K to 6500K and an LED yellow light group with a peak wavelength of 580nm to 595nm.

[0035] Compared with existing technologies, the present invention has the following advantages:

[0036] This invention combines a photovoltaic panel module, a charging and discharging module, an energy storage battery, a rain and fog sensor, a control module, an LED constant current drive circuit, and an LED output unit. The LED output unit uses both white and yellow LED light groups. The rain and fog sensor collects rain and fog intensity signals. When the rain and fog intensity equals or exceeds a preset threshold, the light color can be automatically switched from white to yellow according to predefined requirements. In rainy and foggy weather, yellow light has better penetration than white light, effectively improving the lighting range and visibility, reducing traffic accidents, and ensuring the safety of pedestrians and vehicles. This requires no manual intervention, improving the intelligence and ease of use of streetlights. Attached Figure Description

[0037] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] Figure 1 This is a schematic diagram of the various structures of the solar street light system that automatically switches to yellow light in rainy and foggy weather according to the present invention.

[0039] Figure 2 This is a flowchart of the control method for the solar street light system that automatically switches to yellow light in rainy and foggy weather according to the present invention.

[0040] The image includes:

[0041] Photovoltaic panel module 1, charging and discharging module 2, energy storage battery 3, rain and fog sensor 4, control module 5, LED constant current drive circuit 6, LED output unit 7, LED white light group 71, LED yellow light group 73, photovoltaic panel detection unit 8, voltage and current sampling unit 9, reverse connection protection module 10, output short circuit and open circuit protection unit 11. Detailed Implementation

[0042] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0043] like Figures 1 to 2As shown, a solar street light system that automatically switches to yellow light in rainy and foggy weather includes a photovoltaic panel module 1, a charging and discharging module 2, an energy storage battery 3, a rain and fog sensor 4, a control module 5, an LED constant current drive circuit 6, an LED output unit 7, a photovoltaic panel detection unit 8 for collecting photovoltaic panel voltage signals, and a voltage and current sampling unit 9 for collecting battery voltage signals. The photovoltaic panel module 1 serves as the system's energy source, generating electricity during the day when sunlight is abundant, converting solar energy into electrical energy. The photovoltaic panel module 1 is electrically connected to the energy storage battery 3 via the charging and discharging module 2; the charging and discharging module 2 manages the charging and discharging process, storing the electrical energy generated by the photovoltaic panel module 1 in the energy storage battery 3 during the day, and releasing the electrical energy from the energy storage battery 3 at night or when sunlight is insufficient to power the system. The rain and fog sensor 4 collects rain and fog intensity signals and transmits these signals to the control module 5. The rain and fog sensor 4 can be an infrared scattering rain and fog sensor or a humidity and light scattering composite sensor, or other types of sensors that meet the requirements of this application's solar street light system. The rain and fog sensor 4 can accurately detect changes in rain and fog in the surrounding environment, providing a basis for switching lights. The control module 5 is connected to the charging and discharging module 2 and the rain and fog sensor 4 to output charging management commands and receive rain and fog intensity signals. Furthermore, the control module 5 is also connected to the photovoltaic panel detection unit 8 and the voltage and current sampling unit 9 to receive photovoltaic panel voltage signals and battery voltage signals. The control module 5 is a microcontroller with powerful processing capabilities and rich interfaces, ensuring reliable connection with each module. The control module 5 can receive rain and fog intensity signals, photovoltaic panel voltage signals, and battery voltage signals, and after analysis and processing, determine whether to switch light colors; it can also output charging management commands to the charging and discharging module 2, initiating charging mode. During the day, the electrical energy generated by the photovoltaic panel module 1 is stored in the energy storage battery 3. The rain and fog intensity LED output unit 7 includes an LED white light group 71 and an LED yellow light group 73. The control module 5 is electrically connected to the LED white light group 71 and the LED yellow light group 73 respectively through the LED constant current drive circuit 6 to control the conduction or cutoff of the LED white light group 71 and the LED yellow light group 73. Specifically, the white light input terminal of the LED constant current drive circuit 6 is electrically connected to the load output terminal of the charge and discharge module 2, and the white light enable terminal of the LED constant current drive circuit 6 is electrically connected to the low-level output terminal of the control module 5. The LED white light group 71 is electrically connected to the white light output terminal of the LED constant current drive circuit 6. The yellow light input terminal of the LED constant current drive circuit 6 is electrically connected to the load output terminal of the charge and discharge module 2, and the yellow light enable terminal of the LED constant current drive circuit 6 is electrically connected to the high-level output terminal of the control module 5. The LED yellow light group 73 is electrically connected to the yellow light output terminal of the LED constant current drive circuit 6.The control module 5 is electrically connected to the white light enable terminal and the yellow light enable terminal of the LED constant current drive circuit 6 via its low-level output terminal and high-level output terminal, respectively. This connection method allows for precise control of the on / off state of the LED white light group 71 and the LED yellow light group 73, enabling the control module 5 to precisely control the on / off state and brightness of the two types of lights via PWM signals. The energy storage battery 3 supplies power to the control module 5, the rain and fog sensor 4, the photovoltaic panel detection unit 8, and the voltage and current sampling unit 9, and discharges power to the LED constant current drive circuit 6 and the LED output unit 7.

[0044] This solar street light system, which automatically switches to yellow light in rainy and foggy weather, combines a photovoltaic panel module 1, a charging and discharging module 2, an energy storage battery 3, a rain and fog sensor 4, a control module 5, an LED constant current drive circuit 6, an LED output unit 7, a photovoltaic panel detection unit 8, and a voltage and current sampling unit 9. The LED output unit 7 uses LED white light groups 71 and LED yellow light groups 73 to form the LED output unit. During the day, the photovoltaic panel module 1 generates electricity, which is stored in the energy storage battery 3 through the charging and discharging module 2. The energy storage battery 3 not only powers the control module 5, the rain and fog sensor 4, the ambient light sensor, and the voltage and current sampling unit 9, but also provides energy reserves for subsequent lighting. When night falls or sunlight is insufficient, the rain and fog sensor 4, the photovoltaic panel detection unit 8, and the voltage and current sampling unit 9 activate, collecting rain and fog intensity signals, photovoltaic panel voltage signals, and battery voltage signals in real time and transmitting them to the control module 5. This design utilizes the rain and fog sensor 4 to collect rain and fog intensity signals. When the rain and fog intensity is equal to or greater than the preset threshold, the light color can be automatically switched from white light to yellow light according to the set requirements such as photovoltaic panel voltage signal and battery voltage signal. In rainy and foggy weather, yellow light has better penetration than white light, which can effectively improve the lighting range and visibility, reduce the occurrence of traffic accidents, and ensure the safety of pedestrians and vehicles. No manual intervention is required, which improves the intelligence level and ease of use of the street light.

[0045] Preferably, a reverse connection protection module 10 is electrically connected between the photovoltaic panel module 1 and the charging / discharging module 2. The reverse connection protection module 10 is designed to promptly disconnect the circuit, preventing hardware failures caused by the connection between the photovoltaic panel module 1 and the charging / discharging module 2, and avoiding safety risks such as short circuits, overheating, or even fires that may result from reverse connection. This allows for rapid response to abnormal connections, preventing the flow of dangerous currents and protecting personnel safety and the overall stability of the system. Specifically, the reverse connection protection module 10 is composed of a MOSFET reverse connection protection circuit or a diode reverse connection protection circuit, featuring low conduction loss and high reliability, which enhances the safety and stability of the system.

[0046] In this embodiment, an output short-circuit open-circuit protection unit 11 is electrically connected between the LED constant current drive circuit 6 and the LED output unit 7. The output short-circuit open-circuit protection unit 11 has the characteristics of protecting the LED output unit 7, ensuring the safety of the LED constant current drive circuit 6, and improving the system reliability. It not only protects the hardware equipment, but also improves the system reliability, energy efficiency and maintenance convenience.

[0047] In this embodiment,

[0048] This invention also discloses a control method for a solar street light system that automatically switches to yellow light in rainy and foggy weather. This method utilizes the aforementioned solar street light system that automatically switches to yellow light in rainy and foggy weather, and includes the following steps:

[0049] Step 1: Receive the photovoltaic panel voltage signal collected by the photovoltaic panel detection unit 8;

[0050] Step 2: Make a judgment based on the photovoltaic panel voltage signal and the preset threshold of the light voltage;

[0051] When the photovoltaic panel voltage is greater than or equal to the preset threshold of light voltage, it is determined to be daytime mode and the LED output unit 7 is turned off;

[0052] When the photovoltaic panel voltage is lower than the preset threshold of the light voltage, it is determined to be in night mode. A low-level signal is output to the LED constant current drive circuit, which controls the LED white light group 71 to turn on the lighting and display white light.

[0053] Step 3: In night mode, receive the rain and fog intensity signal collected by rain and fog sensor 4;

[0054] Step 4: Make a judgment based on the rain and fog intensity signal and the preset rain and fog threshold;

[0055] When the rain and fog intensity is less than the preset threshold, it is determined to be in white light illumination mode. A low-level signal is output to the LED constant current drive circuit to maintain the LED white light group 71 to continue illuminating and displaying white light.

[0056] When the rain / fog intensity is equal to or greater than a preset rain / fog threshold, the control module 5 starts its internal delay timer for a delay time t; preferably, the delay time t is 5-30 seconds. The control module 5's internal delay timer ensures that switching is only performed after the rain / fog intensity has been continuously equal to or greater than the preset threshold for time t, effectively preventing frequent light switching caused by instantaneous rain / fog fluctuations (such as brief changes in fog due to wind), protecting the LED output unit 7 and the control module 5, and extending the system's lifespan.

[0057] Step 5: If the rain and fog intensity remains equal to or greater than the preset rain and fog threshold within the delay time t, a switching action is performed. If the mode is determined to be yellow light, a high-level signal is output to the LED constant current drive circuit to control the LED yellow light group 73 to turn on the illumination and display yellow light; otherwise, the white light illumination mode is maintained, and a low-level signal is output to the LED constant current drive circuit to display white light.

[0058] Step 6: In yellow light illumination mode, receive the battery voltage signal collected by voltage and current sampling unit 9;

[0059] Step 7: Make a judgment based on the collected battery voltage signal and the low battery preset threshold;

[0060] When the battery voltage is below the low charge threshold, the LED white light group 71 will remain illuminated to display white light even if a rain or fog intensity signal is detected; or the LED yellow light group 73 will be lit only intermittently.

[0061] Preferably, in the application of a solar street light system that automatically switches to yellow light in rainy and foggy weather, the color temperature of the LED white light group 71 is 5000K to 6500K; the peak wavelength of the LED yellow light group 73 is 580nm to 595nm. The longer wavelength of yellow light, set within the 580nm to 595nm range, means that in rainy and foggy weather, the light is less easily scattered by water vapor, allowing it to penetrate fog and rainwater more effectively, making the road lighting range clearer and helping pedestrians and drivers to spot road conditions and obstacles in advance, thus improving safety. Moreover, compared to high color temperature white light in the 5000K to 6500K range, yellow light is softer and does not produce strong glare, effectively improving the lighting range and visibility. This avoids driver visual fatigue or blurred vision caused by light reflection or scattering in rainy and foggy weather, reducing the occurrence of traffic accidents and lowering the risk of traffic accidents, thus contributing to the safety of pedestrians and vehicles.

[0062] Therefore, the control method of the solar street light system that automatically switches to yellow light in rainy and foggy weather is implemented as described above. The rain and fog sensor 4 detects the intensity of rain and fog in the environment in real time. When the intensity of rain and fog exceeds or equals the preset threshold and remains stable, it can automatically switch from white light to yellow light with stronger penetration, which significantly improves the road lighting effect in rainy and foggy weather, reduces light scattering, improves the visibility distance and safety of drivers and pedestrians, reduces the risk of traffic accidents, and helps to protect the safety of pedestrians and vehicles.

[0063] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A solar street light system with automatic switching of yellow light in rain and fog, characterized by, include: Photovoltaic module, which generates electricity during the day; Charge / discharge module, energy storage battery; The photovoltaic module is electrically connected to the energy storage battery through the charging and discharging module; Rain and fog sensor, used to collect rain and fog intensity signals; The control module is connected to the charging and discharging module and the rain and fog sensor respectively to output charging management commands and receive rain and fog intensity signals; LED constant current drive circuit and LED output unit; the LED output unit includes LED white light group and LED yellow light group; the control module is electrically connected to the LED white light group and LED yellow light group respectively through the LED constant current drive circuit to control the conduction or cutoff of the LED white light group and LED yellow light group; The energy storage battery supplies power to the control module and the rain and fog sensor, and discharges power to the LED constant current drive circuit and the LED output unit.

2. The solar street light system with automatic switching of yellow light in rain and fog according to claim 1, wherein, It also includes a photovoltaic panel detection unit for collecting photovoltaic panel voltage signals and a voltage and current sampling unit for collecting battery voltage signals; the control module is signal-connected to the photovoltaic panel detection unit and the voltage and current sampling unit respectively to receive photovoltaic panel voltage signals and battery voltage signals; the energy storage battery supplies power to the photovoltaic panel detection unit and the voltage and current sampling unit.

3. The solar street light system of claim 2, wherein, The white light input terminal of the LED constant current driving circuit is electrically connected to the load output terminal of the charging and discharging module, and the white light enable terminal of the LED constant current driving circuit is electrically connected to the low-level output terminal of the control module; the LED white light group is electrically connected to the white light output terminal of the LED constant current driving circuit. The yellow light input terminal of the LED constant current driving circuit is electrically connected to the load output terminal of the charging and discharging module, and the yellow light enable terminal of the LED constant current driving circuit is electrically connected to the high-level output terminal of the control module; the LED yellow light group is electrically connected to the yellow light output terminal of the LED constant current driving circuit.

4. The solar street light system of claim 1, wherein, A reverse connection protection module is electrically connected between the photovoltaic panel module and the charging / discharging module; the reverse connection protection module is composed of a MOSFET reverse connection protection circuit or a diode reverse connection protection circuit.

5. The solar street light system of claim 1, wherein, The LED constant current drive circuit and the LED output unit are electrically connected to an output short-circuit and open-circuit protection unit.

6. The solar street light system of claim 1, wherein, The rain and fog sensor is a raindrop sensing module based on a PCB board.

7. A control method of a solar street light system automatically switching yellow light in rain and fog, characterized in that, This is achieved using a solar street light system that automatically switches to yellow light in rainy or foggy weather, as described in any one of claims 1-6, and includes the following steps: Step 1: Receive the photovoltaic panel voltage signal collected by the photovoltaic panel detection unit; Step 2: Make a judgment based on the photovoltaic panel voltage signal and the preset threshold of the light voltage; When the photovoltaic panel voltage is greater than or equal to the preset threshold of light voltage, it is determined to be daytime mode and the LED output unit is turned off; When the photovoltaic panel voltage is lower than the preset threshold of the light voltage, it is determined to be in night mode. A low-level signal is output to the LED constant current drive circuit, which controls the LED white light group to turn on the lighting and display white light by default. Step 3: In night mode, receive the rain and fog intensity signal collected by the rain and fog sensor; Step 4: Make a judgment based on the rain and fog intensity signal and the preset rain and fog threshold; When the rain and fog intensity is less than the preset threshold, it is determined to be in white light illumination mode. A low-level signal is output to the LED constant current drive circuit to maintain the LED white light group to continue illuminating and displaying white light. When the rain / fog intensity is equal to or greater than the preset rain / fog threshold, the control module starts its internal delay timer for a delay time t. Step 5: If the rain / fog intensity remains equal to or greater than the preset rain / fog threshold within the delay time t, execute the switching action. If it is determined to be the yellow light illumination mode, output a high-level signal to the LED constant current drive circuit to control the LED yellow light group to turn on the illumination and display yellow light; otherwise, maintain the white light illumination mode and output a low-level signal to the LED constant current drive circuit to display white light.

8. The control method of the solar street light system automatically switching yellow light in rain and fog according to claim 7, characterized in that, In step three, the delay time t is 5-30s.

9. The control method of the solar street light system automatically switching yellow light in rain and fog according to claim 7, characterized in that, Also includes: Step 6: Receive the battery voltage signal acquired by the voltage and current sampling unit; Step 7: Make a judgment based on the collected battery voltage signal and the low battery preset threshold; When the battery voltage is below the low charge threshold, the LED white light group will continue to illuminate and display white light even if a rain or fog intensity signal is detected; or the LED yellow light group will only be lit intermittently.

10. The control method of the solar street light system automatically switching yellow light in rain and fog according to claim 7, characterized in that, The color temperature of the LED white light group is 5000K to 6500K; the peak wavelength of the LED yellow light group is 580nm to 595nm.

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