LED street lamp dimming control system

Abstract

The utility model discloses a light-emitting diode (LED) street lamp dimming control system, which belongs to the technical field of LED driving, comprises an industrial personal computer, a plurality of dimming controllers and a 485 repeater, and solves the technical problems that each path of LED lamp bead string is independently controlled through one controller, the current condition of each street lamp bead string is detected in real time, and the independent dimming and state detection of each LED lamp are realized. The LED lamp has the advantages of realizing independent dimming, adapting to lighting requirements of different areas and different time, saving energy, having a current detection function of each path of LED lamp bead string, being capable of detecting the working state in real time, prolonging the service life of the lamp, having high anti-interference performance and reliability, being suitable for a complex urban environment, being capable of dynamically adjusting the brightness of the LED lamp according to the change of the ambient illuminance, and being high in practicability. The intelligent level of the system is improved, the system adopts a modular design, each functional module can be independently maintained and replaced, and the maintainability and expandability of the system are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED driving, and in particular relates to a dimming control system for an LED street lamp. Background Art

[0002] At present, LED street lights have been widely used in urban lighting. Traditional LED street light control systems usually use simple switch or timing control methods, which makes it difficult to achieve intelligent and refined management. In order to improve energy efficiency and extend the life of LEDs, various dimming control systems have appeared on the market. These systems reduce energy consumption, reduce light pollution, and extend the life of equipment by adjusting the brightness of LED lights. Common dimming methods include PWM dimming and analog dimming.

[0003] Deficiencies of existing technology:

[0004] 1. Single control: Most systems can only control a group of LED lights as a whole, lack the ability to fine-tune individual LED lights, and cannot achieve independent dimming and status monitoring.

[0005] 2. Insufficient detection capabilities: Many systems lack real-time detection and feedback mechanisms for LED lamp currents, making it difficult to respond in a timely manner when a fault occurs. Utility Model Content

[0006] The purpose of the utility model is to provide an LED street lamp dimming control system, which solves the technical problem of independently controlling each LED lamp string through a controller and detecting the current of each lamp string in real time to achieve independent dimming and status detection of each LED lamp.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An LED street lamp dimming control system includes an industrial computer, several dimming controllers and 485 repeaters, and all the dimming controllers and 485 repeaters are connected to the industrial computer through a 485 bus;

[0009] The dimming controller includes a main controller, a main power module, a first 485 module, a second 485 module, a light intensity transmitter, a first LED driving unit, a second LED driving unit and a third LED driving unit. The first 485 module, the second 485 module, the first LED driving unit, the second LED driving unit and the third LED driving unit are all connected to the main controller, the light intensity transmitter is connected to the second 485 module, and the first 485 module is connected to the 485 bus;

[0010] The main power supply module supplies power to the main controller, the first 485 module, the second 485 module, the light intensity transmitter, the first LED driving unit, the second LED driving unit and the third LED driving unit;

[0011] The first LED driving unit includes a driving power supply a, an LED driver a and an amplifier a, wherein the input end of the driving power supply a is connected to the main power supply module, and the output end supplies power to the LED driver a and the amplifier a, the PWM control end of the LED driver a is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier a, the output end of the amplifier a is connected to an AD interface of the main controller, and the enable end of the driving power supply a is connected to an IO port of the main controller;

[0012] The second LED driving unit includes a driving power supply b, an LED driver b and an amplifier b, wherein the input end of the driving power supply b is connected to the main power supply module, and the output end supplies power to the LED driver b and the amplifier b, the PWM control end of the LED driver b is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier b, the output end of the amplifier b is connected to an AD interface of the main controller, and the enable end of the driving power supply b is connected to an IO port of the main controller;

[0013] The third LED driving unit includes a driving power supply c, an LED driver c and an amplifier c. The input end of the driving power supply c is connected to the main power supply module, and the output end supplies power to the LED driver c and the amplifier c. The PWM control end of the LED driver c is connected to an IO port of the main controller, and the current sampling end is connected to the input end of the amplifier c. The output end of the amplifier c is connected to an AD interface of the main controller, and the enable end of the driving power supply c is connected to an IO port of the main controller.

[0014] Preferably, the model of the main controller is STM32F103C8T6, the main power supply module is a switching power supply, the models of the first 485 module and the second 485 module are both MAX485, and the model of the light intensity transmitter is FXA-TG100-GZ.

[0015] Preferably, in the first LED driving unit, the driving power supply a includes a DC-DC module IC4, a capacitor C6, a diode D3, an inductor L3 and a capacitor C7, pin 1 of the DC-DC module IC4 is connected to the output end of the main power module, pin 3 is connected to the first ground line, pin 2 outputs the driving power supply through L3, and pin 4 is connected to the driving power supply, capacitor C6 is a filter capacitor of pin 1 of the DC-DC module IC4, the cathode of the diode D3 is connected to pin 2 of the DC-DC module IC4, and the anode is connected to the first ground line, the anode of the capacitor C7 is connected to the driving power supply, and the cathode is connected to the first ground line, and pin 5 of the DC-DC module IC4 is an enable terminal of the driving power supply a;

[0016] LED driver a includes driver IC5, diode D4, inductor L4, resistor R13, resistor R12 and interface J1, the GND terminal of driver IC5 is connected to the first ground line, the VIN terminal is connected to the driving power supply, the SCN terminal is connected to the connection node of resistor R12 and resistor R13, the SW terminal is connected to pin 2 of interface J1 through inductor L4, pin 1 of interface J1 is connected to the driving power supply through resistor R12 and resistor R13 connected in series, the cathode of diode D4 is connected to the VIN terminal of driver IC5, and the anode is connected to the SW terminal of driver IC5, the two ends of resistor R13 are current sampling terminals of LED driver a, interface J1 is connected to an external LED lamp bead string, and the DIM terminal of driver IC5 is the PWM control terminal of LED driver a;

[0017] Amplifier a includes amplifier IC6, field effect tube R6, resistor R5 and capacitor C4, the input end of amplifier IC6 is the input end of amplifier a, and the output end is the output end of amplifier a, that is, the IN-end and IN+end of amplifier IC6 are respectively connected to the two ends of resistor R13, the VS end is connected to the D pole of field effect tube Q6, the OUT end is the output end connected to an AD interface of the main controller, the GND end is connected to the second ground wire, the S pole of field effect tube Q6 is connected to the main power module, and the G pole is connected to an IO port of the main controller; capacitor C4 is a filter capacitor at the VS end of amplifier IC6, and resistor R5 is connected between the G pole and the S pole of field effect tube R6;

[0018] The circuit principle structure of the second LED driving unit and the third LED driving unit is the same as that of the first LED driving unit.

[0019] Preferably, the model of the DC-DC module IC4 is LM2596, the model of the driver IC5 is PT4115, and the model of the amplifier IC6 is INA180.

[0020] Preferably, the G pole of the field effect transistor Q6 is connected to an IO port of the main controller through an optocoupler isolator IC2, the 5th pin of the DC-DC module IC4 is connected to an IO port of the main controller through an optocoupler isolator IC1, and the DIM end of the driver IC5 is connected to an IO port of the main controller through an optocoupler isolator IC3.

[0021] Preferably, the first ground line is provided by the main power module, and the main controller, the first 485 module and the second 485 module are all connected to the first ground line.

[0022] The LED street lamp dimming control system described in the utility model solves the technical problem of independently controlling each LED lamp string through one controller and detecting the current of each lamp string in real time to realize independent dimming and status detection of each LED lamp. The utility model can independently control multiple LED lamp strings with one controller to realize individual dimming, adapt to the lighting needs of different areas and at different times, save energy, have the current detection function of each LED lamp string, can detect the working status in real time, and promptly cut off the power for protection when abnormalities are found, thereby extending the service life of the lamp, adopts 485 bus communication, has high anti-interference and reliability, and is suitable for complex urban environments. The system integrates a light intensity transmitter, which can dynamically adjust the brightness of the LED lamp according to the changes in ambient light intensity, thereby improving the intelligence level of the system, and has real-time detection and fault feedback functions. When an abnormal current of a certain lamp string is detected, it can provide the function of timely controlling its disconnection to avoid further damage. The system adopts a modular design, and each functional module can be independently maintained and replaced, thereby improving the maintainability and scalability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a system architecture diagram of the utility model;

[0024] Figure 2 It is a schematic block diagram of the dimming controller of the utility model;

[0025] Figure 3 It is a circuit diagram of the dimming controller of the utility model;

[0026] Figure 4 It is a circuit diagram of an optocoupler isolation circuit of a first LED driving unit of the utility model. DETAILED DESCRIPTION

[0027] Depend on Figure 1-4 The LED street light dimming control system shown includes an industrial computer, several dimming controllers and 485 repeaters, and all the dimming controllers and 485 repeaters are connected to the industrial computer through a 485 bus;

[0028] In this embodiment, since the street lamps are spaced far apart, a 485 repeater needs to be added during actual installation to extend the data transmission distance. The installation of the 485 repeater is a prior art and will not be described in detail.

[0029] The dimming controller includes a main controller, a main power module, a first 485 module, a second 485 module, a light intensity transmitter, a first LED driving unit, a second LED driving unit and a third LED driving unit. The first 485 module, the second 485 module, the first LED driving unit, the second LED driving unit and the third LED driving unit are all connected to the main controller, the light intensity transmitter is connected to the second 485 module, and the first 485 module is connected to the 485 bus;

[0030] The model of the main controller is STM32F103C8T6, the main power supply module is a switching power supply, the models of the first 485 module and the second 485 module are both MAX485, and the model of the light intensity transmitter is FXA-TG100-GZ.

[0031] In this embodiment, the main power supply module is a switching power supply with 220V AC input and 5V and 24V DC output, wherein 24V is used to power the first LED driver unit, the second LED driver unit and the third LED driver unit, and the 5V power supply is used to power the main controller, the first 485 module and the second 485 module. The light intensity transmitter can be powered by the main power supply module or by an external power supply.

[0032] The main power supply module supplies power to the main controller, the first 485 module, the second 485 module, the light intensity transmitter, the first LED driving unit, the second LED driving unit and the third LED driving unit;

[0033] The first LED driving unit includes a driving power supply a, an LED driver a and an amplifier a, wherein the input end of the driving power supply a is connected to the main power supply module, and the output end supplies power to the LED driver a and the amplifier a, the PWM control end of the LED driver a is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier a, the output end of the amplifier a is connected to an AD interface of the main controller, and the enable end of the driving power supply a is connected to an IO port of the main controller;

[0034] In the first LED driving unit, the driving power supply a includes a DC-DC module IC4, a capacitor C6, a diode D3, an inductor L3 and a capacitor C7, pin 1 of the DC-DC module IC4 is connected to the output end of the main power module, pin 3 is connected to the first ground line, pin 2 outputs the driving power supply through L3, and pin 4 is connected to the driving power supply, capacitor C6 is a filter capacitor of pin 1 of the DC-DC module IC4, the cathode of the diode D3 is connected to pin 2 of the DC-DC module IC4, and the anode is connected to the first ground line, the anode of the capacitor C7 is connected to the driving power supply, and the cathode is connected to the first ground line, and pin 5 of the DC-DC module IC4 is an enable terminal of the driving power supply a;

[0035] The driving power supply a supplies power to a single LED light string. The voltage output by the DC-DC module IC4 supplies power to the driver IC5. The enable terminal 5 of the DC-DC module IC4 is controlled by the main controller. The main controller can directly switch the output voltage of the DC-DC module IC4, thereby controlling the switch of the LED light string.

[0036] LED driver a includes driver IC5, diode D4, inductor L4, resistor R13, resistor R12 and interface J1. The GND terminal of driver IC5 is connected to the first ground line, the VIN terminal is connected to the driving power supply, the SCN terminal is connected to the connection node of resistor R12 and resistor R13, the SW terminal is connected to pin 2 of interface J1 through inductor L4, and pin 1 of interface J1 is connected to the driving power supply through resistor R12 and resistor R13 connected in series. The cathode of diode D4 is connected to the VIN terminal of driver IC5, and the anode is connected to the SW terminal of driver IC5. The two ends of resistor R13 are current sampling terminals of LED driver a. Interface J1 is connected to an external LED lamp bead string. The DIM terminal of driver IC5 is the PWM control terminal of LED driver a.

[0037] In this embodiment, the driver IC5 is a main dimming chip for driving the LED light string. The main controller controls the DIM terminal of the driver IC5 through a PWM signal to achieve dimming.

[0038] Amplifier a includes amplifier IC6, field effect transistor R6, resistor R5 and capacitor C4. The input end of amplifier IC6 is the input end of amplifier a, and the output end is the output end of amplifier a, that is, the IN-end and IN+end of amplifier IC6 are respectively connected to the two ends of resistor R13, the VS end is connected to the D pole of field effect transistor Q6, the OUT end is the output end connected to an AD interface of the main controller, the GND end is connected to the second ground wire, the S pole of field effect transistor Q6 is connected to the main power module, and the G pole is connected to an IO port of the main controller; capacitor C4 is a filter capacitor at the VS end of amplifier IC6, and resistor R5 is connected between the G pole and the S pole of field effect transistor R6.

[0039] In this embodiment, a current sampling detection is also provided, which detects the current signal on the LED light string through the sampling resistor R13, and after amplification by the amplifier IC6, sends it to the main controller for post-processing, thereby realizing the function of status detection of a single LED light string.

[0040] The power supply of the amplifier IC6 is through the field effect transistor Q6 controller. When the LED light string needs to be turned off, the main controller can also turn off the power supply to the amplifier IC6 through the field effect transistor Q6, thereby reducing power consumption and signal interference between each LED light string.

[0041] The second LED driving unit includes a driving power supply b, an LED driver b and an amplifier b, wherein the input end of the driving power supply b is connected to the main power supply module, and the output end supplies power to the LED driver b and the amplifier b, the PWM control end of the LED driver b is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier b, the output end of the amplifier b is connected to an AD interface of the main controller, and the enable end of the driving power supply b is connected to an IO port of the main controller;

[0042] The third LED driving unit includes a driving power supply c, an LED driver c and an amplifier c. The input end of the driving power supply c is connected to the main power supply module, and the output end supplies power to the LED driver c and the amplifier c. The PWM control end of the LED driver c is connected to an IO port of the main controller, and the current sampling end is connected to the input end of the amplifier c. The output end of the amplifier c is connected to an AD interface of the main controller, and the enable end of the driving power supply c is connected to an IO port of the main controller.

[0043] The circuit principle structure of the second LED driving unit and the third LED driving unit is the same as that of the first LED driving unit. In this embodiment, one main controller is responsible for controlling three LED light strings, and the circuit principles of these three LED driving circuits are the same.

[0044] The model of the DC-DC module IC4 is LM2596, the model of the driver IC5 is PT4115, and the model of the amplifier IC6 is INA180.

[0045] The G pole of the field effect transistor Q6 is connected to an IO port of the main controller through an optocoupler isolator IC2, the 5th pin of the DC-DC module IC4 is connected to an IO port of the main controller through an optocoupler isolator IC1, and the DIM end of the driver IC5 is connected to an IO port of the main controller through an optocoupler isolator IC3.

[0046] In this embodiment, the 5V power supply system and the 24V power supply system are isolated by an optocoupler isolator.

[0047] The second LED driving unit and the third LED driving unit also establish a control connection with the main controller in a photocoupler isolation manner.

[0048] The first ground line is provided by the main power module, and the main controller, the first 485 module and the second 485 module are all connected to the first ground line.

[0049] In this embodiment, the industrial computer is responsible for overall control and regulation, and realizes communication with each street lamp through the 485 bus. Each street lamp is equipped with a dimming controller, so as to realize status detection and dimming of each street lamp and each individual LED light string in the street lamp.

[0050] The LED street lamp dimming control system described in the utility model solves the technical problem of independently controlling each LED lamp string through one controller and detecting the current of each lamp string in real time to realize independent dimming and status detection of each LED lamp. The utility model can independently control multiple LED lamp strings with one controller to realize individual dimming, adapt to the lighting needs of different areas and at different times, save energy, have the current detection function of each LED lamp string, can detect the working status in real time, and promptly cut off the power for protection when abnormalities are found, thereby extending the service life of the lamp, adopts 485 bus communication, has high anti-interference and reliability, and is suitable for complex urban environments. The system integrates a light intensity transmitter, which can dynamically adjust the brightness of the LED lamp according to the changes in ambient light intensity, thereby improving the intelligence level of the system, and has real-time detection and fault feedback functions. When an abnormal current of a certain lamp string is detected, it can provide the function of timely controlling its disconnection to avoid further damage. The system adopts a modular design, and each functional module can be independently maintained and replaced, thereby improving the maintainability and scalability of the system.

Claims

1. A LED street lamp dimming control system, characterized in that: It includes an industrial computer, several dimming controllers and 485 repeaters. All dimming controllers and 485 repeaters are connected to the industrial computer through a 485 bus. The dimming controller includes a main controller, a main power module, a first 485 module, a second 485 module, a light intensity transmitter, a first LED driving unit, a second LED driving unit and a third LED driving unit. The first 485 module, the second 485 module, the first LED driving unit, the second LED driving unit and the third LED driving unit are all connected to the main controller, the light intensity transmitter is connected to the second 485 module, and the first 485 module is connected to the 485 bus; The main power supply module supplies power to the main controller, the first 485 module, the second 485 module, the light intensity transmitter, the first LED driving unit, the second LED driving unit and the third LED driving unit; The first LED driving unit includes a driving power supply a, an LED driver a and an amplifier a, wherein the input end of the driving power supply a is connected to the main power supply module, and the output end supplies power to the LED driver a and the amplifier a, the PWM control end of the LED driver a is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier a, the output end of the amplifier a is connected to an AD interface of the main controller, and the enable end of the driving power supply a is connected to an IO port of the main controller; The second LED driving unit includes a driving power supply b, an LED driver b and an amplifier b, wherein the input end of the driving power supply b is connected to the main power supply module, and the output end supplies power to the LED driver b and the amplifier b, the PWM control end of the LED driver b is connected to an IO port of the main controller, the current sampling end is connected to the input end of the amplifier b, the output end of the amplifier b is connected to an AD interface of the main controller, and the enable end of the driving power supply b is connected to an IO port of the main controller; The third LED driving unit includes a driving power supply c, an LED driver c and an amplifier c. The input end of the driving power supply c is connected to the main power supply module, and the output end supplies power to the LED driver c and the amplifier c. The PWM control end of the LED driver c is connected to an IO port of the main controller, and the current sampling end is connected to the input end of the amplifier c. The output end of the amplifier c is connected to an AD interface of the main controller, and the enable end of the driving power supply c is connected to an IO port of the main controller.

2. The LED street light dimming control system according to claim 1, characterized in that: The model of the main controller is STM32F103C8T6, the main power supply module is a switching power supply, the models of the first 485 module and the second 485 module are both MAX485, and the model of the light intensity transmitter is FXA-TG100-GZ.

3. The LED street light dimming control system according to claim 1, characterized in that: In the first LED driving unit, the driving power supply a includes a DC-DC module IC4, a capacitor C6, a diode D3, an inductor L3 and a capacitor C7, pin 1 of the DC-DC module IC4 is connected to the output end of the main power module, pin 3 is connected to the first ground line, pin 2 outputs the driving power supply through L3, and pin 4 is connected to the driving power supply, capacitor C6 is a filter capacitor of pin 1 of the DC-DC module IC4, the cathode of the diode D3 is connected to pin 2 of the DC-DC module IC4, and the anode is connected to the first ground line, the anode of the capacitor C7 is connected to the driving power supply, and the cathode is connected to the first ground line, and pin 5 of the DC-DC module IC4 is an enable terminal of the driving power supply a; LED driver a includes driver IC5, diode D4, inductor L4, resistor R13, resistor R12 and interface J1, the GND terminal of driver IC5 is connected to the first ground line, the VIN terminal is connected to the driving power supply, the SCN terminal is connected to the connection node of resistor R12 and resistor R13, the SW terminal is connected to pin 2 of interface J1 through inductor L4, pin 1 of interface J1 is connected to the driving power supply through resistor R12 and resistor R13 connected in series, the cathode of diode D4 is connected to the VIN terminal of driver IC5, and the anode is connected to the SW terminal of driver IC5, the two ends of resistor R13 are current sampling terminals of LED driver a, interface J1 is connected to an external LED lamp bead string, and the DIM terminal of driver IC5 is the PWM control terminal of LED driver a; Amplifier a includes amplifier IC6, field effect tube R6, resistor R5 and capacitor C4, the input end of amplifier IC6 is the input end of amplifier a, and the output end is the output end of amplifier a, that is, the IN-end and IN+end of amplifier IC6 are respectively connected to the two ends of resistor R13, the VS end is connected to the D pole of field effect tube Q6, the OUT end is the output end connected to an AD interface of the main controller, the GND end is connected to the second ground wire, the S pole of field effect tube Q6 is connected to the main power module, and the G pole is connected to an IO port of the main controller; capacitor C4 is a filter capacitor at the VS end of amplifier IC6, and resistor R5 is connected between the G pole and the S pole of field effect tube R6; The circuit principle structure of the second LED driving unit and the third LED driving unit is the same as that of the first LED driving unit.

4. The LED street light dimming control system according to claim 3, characterized in that: The model of the DC-DC module IC4 is LM2596, the model of the driver IC5 is PT4115, and the model of the amplifier IC6 is INA180.

5. The LED street lamp dimming control system according to claim 3, characterized in that: The G pole of the field effect transistor Q6 is connected to an IO port of the main controller through an optocoupler isolator IC2, the 5th pin of the DC-DC module IC4 is connected to an IO port of the main controller through an optocoupler isolator IC1, and the DIM end of the driver IC5 is connected to an IO port of the main controller through an optocoupler isolator IC3.

6. The LED street lamp dimming control system according to claim 3, characterized in that: The first ground line is provided by the main power module, and the main controller, the first 485 module and the second 485 module are all connected to the first ground line.

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