Light controller for highway ramp LED guide light strip

Abstract

The utility model provides a kind of light controller for expressway ramp LED guide light band, the light controller includes light control MCU module, relay and current detection module, in addition to satisfy the power supply of conventional LED light band, current detection module can monitor the power supply current variation of LED light band, and further judge whether light band appears fault.One side, when power supply current suddenly greatly changes, information can be sent to the control center by the main control module of remote end, so as to remind maintenance personnel to carry out maintenance in time.The other side, once it is found that power supply current is too large, it can be cut off by relay, avoid electric element damage by overcurrent, ensure the normal operation of traffic facilities and driving safety.

Description

Technical Field

[0001] This utility model belongs to the field of highway traffic management technology and relates to a lighting controller for LED guide light strips on highway ramps. Background Technology

[0002] Currently, incidents of vehicles crashing into guardrails while driving on highway ramps are frequent, especially for inexperienced novice drivers driving at night. Due to poor visibility at night and slow reaction time to changes in the route, traffic accidents often occur. Therefore, it is necessary to install lighting strips on ramps as a safety guidance and warning system, which is essential to improve safe driving on ramps.

[0003] Chinese patent application number 202420134898.0, entitled "A Highway Ramp Lane Change Warning Device", discloses a highway ramp lane change warning device, which is a ramp warning light strip on the inner wall of the outer guardrail of the ramp. These light strips may malfunction due to being scratched by accident vehicles, damaged by animals, or caused by environmental changes during long-term use. Relying solely on manual inspection will result in low work efficiency and untimely maintenance. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes a lighting controller for LED guide light strips on highway ramps. By detecting the power supply current of the light strips, it can promptly identify faults in the light strips installed along the ramps and report them to the command and control center.

[0005] The technical solution of this utility model is as follows: A lighting controller for LED guide light strips on highway ramps includes a housing and a lighting control MCU module, a relay, a current detection module, and a power supply module installed inside the housing; the power supply module is electrically connected to the lighting control MCU module and the relay. One signal output terminal of the lighting control MCU module is connected to the control terminal of the relay, the power supply module is connected to the upper contact of the relay, the lower contact of the relay is connected to the current input terminal of the current detection module, and the current output terminal of the current detection module is connected to the power supply terminal of the light strip. The signal output terminal of the current detection module is connected to the AD acquisition terminal of the lighting control MCU module, or the signal output terminal of the current detection module is connected to the signal input terminal of the lighting control MCU module through the AD conversion module.

[0006] In the aforementioned lighting controller for LED guide light strips on highway ramps, the lighting control MCU module is an STM32F0 / F microcontroller, the current detection module is an ACS758, and the Vout terminal of the ACS758 is connected to the AD acquisition terminal of the lighting control MCU module.

[0007] In the aforementioned lighting controller for LED guide light strips on highway ramps, the lighting control MCU module is an STM32F0 / F microcontroller, the current detection module is an ACS758, and the Vout terminal of the ACS758 is connected to the signal input terminal of the lighting control MCU module through an AD conversion module, which is an AD7714 chip.

[0008] The aforementioned lighting controller for LED guide light strips on highway ramps also includes a wireless module electrically connected to the lighting control MCU module via an RS485 interface. The lighting control MCU module interacts with the remote master control unit via the wireless module.

[0009] In the aforementioned lighting controller for LED guide light strips on highway ramps, the power supply module includes a voltage regulator and a DC-DC module electrically connected. The voltage regulator inputs 220V AC power and outputs 220V DC power to the relay; the DC-DC module outputs 12V DC power to the lighting control MCU module.

[0010] In the aforementioned lighting controller for LED guide light strips on highway ramps, the main control unit is electrically connected to the vehicle identification sensor and the illuminance sensor.

[0011] In the aforementioned lighting controller for LED guide light strips on highway ramps, the main control unit sends wireless commands to the lighting control MCU module based on the vehicle information obtained by the vehicle identification sensor and the parameters of the illuminance sensor, and then powers on and off the light strips via relays.

[0012] In the above-mentioned lighting controller for LED guide light strips on highway ramps, the light strip is an LED light strip set along the ramp direction; the main control unit consists of an STM32F407VET6 microcontroller and peripheral devices.

[0013] In the aforementioned lighting controller for LED guide light strips on highway ramps, the vehicle identification sensor is a camera or radar tester, installed facing the entrance of the ramp.

[0014] In the aforementioned lighting controller used for LED guide light strips on highway ramps, the main control unit interacts with the command and control center wirelessly.

[0015] The technical effects of this utility model are as follows: This invention provides a lighting controller for LED guide light strips on highway ramps. The controller includes a lighting control MCU module, a relay, and a current detection module. Besides providing power to the LED light strips, the current detection module monitors changes in the LED light strip's power supply current to determine if a fault has occurred. On one hand, if the power supply current suddenly drops significantly, the information can be sent to the control center via the remote main control module to alert maintenance personnel for timely repairs. On the other hand, if excessive current is detected, the relay can cut off the power supply to prevent damage to electrical components due to overcurrent. This intelligent lighting safety guidance system for highway ramps enables LED lights to illuminate on both sides of the guardrail before a vehicle enters the ramp and to turn off after the vehicle safely leaves the ramp, achieving a synchronized intelligent safety warning control effect of "lights on when a vehicle approaches, lights off when a vehicle leaves," ensuring driving safety. Attached Figure Description

[0016] Figure 1 This invention relates to the composition principle of the intelligent lighting safety guidance system for highway ramps. Figure 2 This is a schematic diagram of the lighting controller according to Embodiment 1 of this utility model; Figure 3 This is a pin diagram of the current detection chip of this utility model; Figure 4 This is a schematic diagram of the lighting controller according to Embodiment 2 of this utility model; In the diagram: 1-Main road; 2-Ramp; 3-Ramp entrance; 4-Vehicle; 5-Vehicle identification sensor; 6-Illumination sensor; 7-Main control unit; 8-Light strip; 9-Lighting controller; 10-Command and control center; 11-Housing. Detailed Implementation

[0017] Example 1: like Figure 1 As shown, the intelligent lighting safety guidance and warning system for highway ramps includes a vehicle identification sensor 5, a lighting controller 9, a main control unit 7, and an illuminance sensor 6. The vehicle identification sensor 5, main control unit 7, and illuminance sensor 6 are mounted on poles along the roadside of the main road 1. The vehicle identification sensor 5 is a camera or radar tester, installed facing the entrance of the ramp. The vehicle identification sensor 5 collects the travel information of vehicles 4 about to enter ramp 2 and sends the signal to the main control unit 7. The light strip 8 is an LED light strip, installed on the guardrails on both sides of ramp 2. The lighting controller 9 is installed on the guardrail at the center of the light strip 8.

[0018] The main control unit 7 consists of an STM32F407VET6 microcontroller and peripheral devices. The main control unit 7 acquires signals from the illuminance sensor 6 to determine whether the light strip 8 needs to be turned on. Once the lighting conditions are met (after dark), it sends a command to the lighting controller 9 to illuminate the light strip 8, ensuring that the vehicle 4's lights are on before entering ramp 2, providing a safety reminder. The lights automatically turn off after the vehicle 4 leaves ramp 2, achieving a synchronized intelligent safety warning control effect of "lights on when a vehicle approaches, lights off when a vehicle leaves." The duration of the light strip illumination is estimated based on the minimum vehicle speed and ramp distance, with a time allowance to ensure that most vehicles can exit the ramp. For example, at a certain interchange on the Baomao Expressway, the minimum driving speed is set to 10 km / h. This test section includes a transition section and a deceleration section, with a total ramp length of 404.01 m, meaning the initial design duration of the light strip illumination is 145 seconds.

[0019] like Figure 2 As shown, the lighting controller 9 includes a housing 11 and a lighting control MCU module, a relay, a current detection module, and a power supply module installed inside the housing 11. The power supply module is electrically connected to the lighting control MCU module and the relay, and is used to supply power to the lighting control MCU module and the light strip. The power supply module includes a voltage regulator and a DC-DC module electrically connected to it. The AV220V AC power is converted into DC220V DC power by the SITOP PSU100B voltage regulator and rectifier. One output terminal is applied to the relay contacts, and the other output terminal is converted into DC12V by the DC-DC module to power the lighting controller 9.

[0020] The lighting control MCU module uses an STM32F0 / F chip. One of its signal output terminals is connected to the control terminal of the relay. The output terminal of the voltage regulator and rectifier is connected to the upper contact of the relay, and the lower contact of the relay is connected to the current input terminal of the current detection module. The upper and lower contacts are normally open contacts. Only when the lighting control MCU module outputs a high level and applies it to the relay control terminal will the lower and upper contacts of the relay close, thus supplying power to the LED strip.

[0021] The power output terminal of the current detection module is connected to the power supply terminal of LED strip 8, and the signal output terminal of the current detection module is connected to the built-in AD acquisition terminal of the lighting control MCU module to obtain the current value passing through LED strip 8. Under normal operation, the power supply current per meter of LED strip is 36mA, so the magnitude of the current can be used to determine whether there is a broken wire or short circuit in the LED strip. Figure 3 As shown, the current detection module is a high-precision linear current sensor ACS758 based on the Hall effect. The signal input terminal and AD acquisition terminal of the lighting control MCU module are connected to the Vout terminal of the ACS758 to obtain the power supply current of the light strip. Terminals 4 and 5 are used to pass the current.

[0022] Figure 2The central lighting control MCU module interacts wirelessly with the remote main control unit 7 via an RS485-loRa converter. The loRa wireless module enables wireless data transmission over a range of more than 2km and sends the current parameters of the light strip to the main control unit 7. The main control unit 7 then sends the information to the command and control center 10 via an RS485-4G module.

[0023] When the main control unit 7 detects a sudden and significant decrease in the LED strip current, indicating a substantial length of damage, it sends the information to the command and control center 10. The command and control center 10 then determines whether to dispatch personnel for maintenance based on the extent of the damage. Typically, each meter of LED strip requires 36mA of power, so a 300m ramp would require 10.8A. Considering the LED strip's lifespan, its current naturally decreases with age. Therefore, a sudden drop in current exceeding 5% may indicate damage caused by vehicle collision or other reasons. The command and control center 10 then determines whether on-site maintenance is necessary. Conversely, when the main control unit 7 detects a sudden increase in the LED strip current exceeding the set current threshold, to prevent potential short circuits, the lighting control MCU module outputs a low level and applies it to the relay control terminal. This causes the relay's lower and upper contacts to disconnect, cutting off power to the LED strip and preventing further damage to on-site electronic components. Simultaneously, the main control unit 7 sends the information to the command and control center 10, which then dispatches personnel for timely maintenance.

[0024] Example 2: The difference from Embodiment 1 is that the power supply current is not acquired by the built-in AD terminal of the microcontroller, but by a separate AD7714 chip for AD conversion, which has higher conversion bit and accuracy, thus enabling higher precision control.

[0025] Figure 4 In this circuit, one signal output terminal of the lighting control MCU module is connected to the control terminal of the relay. The power supply is connected to the upper contact of the relay, and the lower contact of the relay is connected to the current input terminal of the current detection module. The upper and lower contacts are normally open; they close only when the lighting control MCU module outputs a high level and applies it to the relay control terminal, thus supplying power to the LED strip. The current output terminal of the current detection module is connected to the power supply terminal of LED strip 8. The signal output terminal of the current detection module is connected to the lighting control MCU module after passing through an AD conversion module to obtain the current value passing through LED strip 8. The AD conversion module uses an independent AD7714 chip, a 24-bit AD converter, which can achieve higher precision current amplitude detection. Under normal operation, the power supply current per meter of LED strip is 36mA, and a 300m ramp requires 10.8A. Therefore, the magnitude of the current can be used to determine whether there is a broken wire or short circuit in the LED strip.

[0026] In addition to providing power to conventional LED light strips, the lighting controller of this invention includes a current detection module that monitors changes in the LED light strip's power supply current to determine if a fault has occurred. This information is then wirelessly transmitted to the control center. Furthermore, if excessive current is detected during operation, a relay can cut off the power supply to prevent damage to electrical components from overcurrent, thus alerting maintenance personnel for timely repairs and ensuring the normal operation of traffic facilities and driving safety.

Claims

1. A lighting controller for LED guide light strips on highway ramps, characterized in that: It includes a housing (11) and a lighting control MCU module, a relay, a current detection module and a power supply module installed inside the housing (11); the power supply module is electrically connected to the lighting control MCU module and the relay; One signal output terminal of the lamp control MCU module is connected to the control terminal of the relay, the power supply module is connected to the upper contact of the relay, the lower contact of the relay is connected to the current input terminal of the current detection module, and the current output terminal of the current detection module is connected to the power supply terminal of the lamp strip (8). The signal output terminal of the current detection module is connected to the AD acquisition terminal of the lighting control MCU module, or the signal output terminal of the current detection module is connected to the signal input terminal of the lighting control MCU module through the AD conversion module.

2. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The lighting control MCU module is an STM32F0 / F microcontroller, and the current detection module is an ACS758. The Vout terminal of the ACS758 is connected to the AD acquisition terminal of the lighting control MCU module.

3. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The lighting control MCU module is an STM32F0 / F microcontroller, and the current detection module is an ACS758. The Vout terminal of the ACS758 is connected to the signal input terminal of the lighting control MCU module through an AD conversion module, which is an AD7714 chip.

4. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The lighting controller (9) also includes a wireless module that is electrically connected to the lighting control MCU module via an RS485 interface. The lighting control MCU module interacts with the remote master control unit (7) via the wireless module.

5. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The power module includes a voltage regulator and a DC-DC module connected electrically. The voltage regulator takes in 220V AC power and outputs 220V DC power to the relay; the DC-DC module outputs 12V DC power to the lighting control MCU module.

6. The lighting controller for the LED guide light strip on highway ramps according to claim 4, characterized in that: The main control unit (7) is electrically connected to the vehicle identification sensor (5) and the illuminance sensor (6).

7. The lighting controller for the LED guide light strip on highway ramps according to claim 6, characterized in that: The main control unit (7) sends a wireless command to the lighting control MCU module based on the vehicle information obtained by the vehicle identification sensor (5) and the parameters of the illuminance sensor (6), and powers on and off the light strip (8) through the relay.

8. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The light strip (8) is an LED light strip set along the ramp direction; the main control unit consists of an STM32F407VET6 microcontroller and peripheral devices.

9. The lighting controller for the LED guide light strip on highway ramps according to claim 7, characterized in that: The vehicle identification sensor (5) is a camera or radar tester, installed facing the entrance of the ramp.

10. The lighting controller for the LED guide light strip on highway ramps according to claim 1, characterized in that: The main control unit (7) interacts with the command and control center (10) wirelessly.

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