A lighting fixture dimming control system

Abstract

The utility model relates to the technical field of lamps and lanterns, specifically relates to a lamp light control system, it contains voltage stabilizing chip and control MCU, voltage stabilizing chip front end is connected with rectifier structure, rectifier structure input end connects commercial power, exports direct current to voltage stabilizing chip, voltage stabilizing chip output 3V3, be equipped with the LED drive chip for driving LED lamp in the system, its according to the light control signal of control MCU adjustment LED lamp's drive current, still be equipped with detection chip in the system, its detection end is connected with the loop of LED lamp, is used for gathering LED operating current and exports current detection signal to control MCU, control MCU still signal connection has the illuminance sensor, in this application, control MCU monitors the current of LED lamp, can acquire environmental brightness simultaneously, thereby generates light control signal and drives control chip, realizes the accurate control of LED current, and then realizes the high accuracy regulation of brightness.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, specifically to a lighting dimming control system. Background Technology

[0002] Existing LED lighting systems typically use mains power and adjust brightness through constant current drivers or simple switches. However, these systems generally suffer from the following problems: First, due to large fluctuations in mains voltage, direct power supply or simple voltage regulation can easily lead to unstable LED brightness, affecting the lighting effect. Second, most LED driver solutions only have unidirectional current control and cannot monitor the LED operating current in real time, thus failing to accurately reflect the LED status and posing certain safety hazards. Summary of the Invention

[0003] The purpose of this utility model is to provide a reasonably designed lighting dimming control system that addresses the defects and shortcomings of the existing technology and solves the aforementioned defects.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: It includes a voltage regulator chip and a control MCU. The front end of the voltage regulator chip is connected to a rectifier structure. The input end of the rectifier structure is connected to the mains power and outputs DC power to the voltage regulator chip. The voltage regulator chip outputs 3V3. The system is equipped with an LED driver chip for driving LED lights. The driver chip adjusts the driving current of the LED lights according to the dimming control signal of the control MCU. The system is also equipped with a detection chip. Its detection end is connected to the circuit of the LED lights. It is used to collect the LED operating current and output the current detection signal to the control MCU. The control MCU is also connected to a light intensity sensor.

[0005] Preferably, in the positive circuit of the LED lamp, a current sensing resistor is connected in series, the CSP of the LED driver chip is connected to the end of the current sensing resistor away from the LED lamp, and the CSN is connected to the end of the current sensing resistor closer to the LED lamp.

[0006] Preferably, a current sensing resistor II is connected in series on the line connecting the negative terminal of the LED lamp. The IN+ pin of the detection chip is connected to the end of the current sensing resistor II closest to the LED lamp, and the IN- pin is connected to the end of the current sensing resistor II furthest from the LED lamp.

[0007] Preferably, the system is equipped with an optocoupler. The two ends of the LED inside the optocoupler are connected to the live and neutral wires on the front side of the rectifier structure through resistors five and six for current limiting, respectively. The collector (C) of the optocoupler is connected to the negative wire in the system, and the emitter (E) is connected to the collector (CO) terminal. The collector (CO) terminal is connected to one of the pins of the control MCU, and the collector (CO) is connected to 3V3 through resistor two for pull-up.

[0008] Preferably, the VIN of the LED driver chip is connected to the VI terminal on the front side of the voltage regulator chip for power, while the VCC terminal is connected to the VI terminal through capacitor two.

[0009] Preferably, the detection chip and the illuminance sensor are powered by 3V3 and communicate with the control MCU via a bus.

[0010] Preferably, the two lines of the bus communication are pulled up by resistors three and four, respectively.

[0011] The beneficial effects of this utility model after adopting the above structure are: 1. In this application, the mains power is rectified and the AMS1117 voltage regulator chip outputs a stable 3.3V voltage, which provides a reliable power supply for the control MCU, detection chip and light intensity sensor, ensuring that the system can still operate stably even under voltage fluctuations.

[0012] 2. In this application, the control MCU monitors the current of the LED lamp and can also obtain the ambient brightness, thereby generating a dimming signal and driving the control chip to achieve precise control of the LED current, and thus achieve high-precision adjustment of brightness.

[0013] 3. This application sets current detection in the positive and negative branches of the LED to achieve dual feedback of LED current and ensure reliability. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention.

[0015] Explanation of reference numerals in the attached diagram: 1. Control MCU; 2. LED driver chip; 3. Detection chip; 4. Optocoupler; 5. Voltage regulator chip; 6. Illuminance sensor; 7. Current detection resistor one; 8. Current detection resistor two; 9. Capacitor one; 10. Capacitor two; 11. Resistor one; 12. Resistor two; 13. Resistor three; 14. Resistor four; 15. Resistor five; 16. Resistor six. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] See Figure 1It includes a voltage regulator chip 5 and a control MCU1. The control MCU1 uses an ATTINY412-SSNR, which is simple to connect and meets the functional requirements. The voltage regulator chip 5 uses a 3.3V AMS1117, which has a rectifier structure connected to its front end. The input of the rectifier structure is connected to the AC power, and the output DC power is sent to the voltage regulator chip 5, which outputs 3V3. The system includes an LED driver chip 2, which uses an LM3409, to drive the LED. It adjusts the driving current of the LED according to the dimming control signal of the control MCU1. It connects to the LED's MOSFET, diode, or inductor, etc., using typical application. This part is omitted in the attached figure. In the figure, L+ is the port of the circuit connected to this chip used to power the LED. The system also includes a detection chip 3, which uses an INA219BID. Its detection terminal is connected to the LED's circuit to collect the LED's operating current and output the current detection signal to the control MCU1. The control MCU1 is also connected to a light intensity sensor 6, which uses a TSL2591EVM. A capacitor -9 is provided between the 3V3 and the negative terminal. In the positive circuit of the LED lamp, a current sensing resistor 7 is connected in series. The CSP of the LED driver chip 2 is connected to the end of the current sensing resistor 7 away from the LED lamp, and the CSN is connected to the end of the current sensing resistor 7 close to the LED lamp. On the line connecting the negative terminal of the LED light, there is a current sensing resistor 28 connected in series. The IN+ pin of the detection chip 3, which is used for detection, is connected to the end of the current sensing resistor 28 closer to the LED light, and the IN- pin is connected to the end of the current sensing resistor 28 further away from the LED light. The system is equipped with optocoupler 4, which is H11AA1. The two ends of the LED inside optocoupler 4 are connected to the live and neutral wires on the front side of the rectifier structure through resistor 15 and resistor 16 for current limiting, respectively. The collector (C) of optocoupler 4 is connected to the negative wire in the system, and the emitter (E) is connected to the collector (CO). The collector (CO) is connected to one of the pins of the control MCU1, and the collector (CO) is connected to 3V3 through resistor 12 for pull-up. The VIN of LED driver chip 2 is connected to the VI terminal on the front side of voltage regulator chip 5 for power. The VCC terminal is connected to the VI terminal through capacitor 10. The output DC voltage of the rectifier structure is set according to LED driver chip 2. For example, in the manual of LM3409, the VIN voltage is 6-42V. Therefore, the rectified voltage can be selected as 24V or 36V, which can meet the requirements and also facilitate the connection of other circuits or devices, making it convenient for structural expansion. The detection chip 3 and the illuminance sensor 6 are powered by 3V3 and communicate with the control MCU1 via the bus. The two lines of the bus communication are pulled up by resistors 313 and 414 respectively.

[0018] This system is mainly used to realize LED lighting control and detection functions based on mains power supply. The working principle is as follows: the mains power is converted into DC power by the rectifier circuit and then input to the voltage regulator chip U5AMS1117. The voltage regulator chip 5 outputs a stable 3.3V voltage, which provides working power for the control MCU1, detection chip 3 and illuminance sensor 6. The control MCU1, as the core control unit, is responsible for receiving the detection signal from the illuminance sensor 6 and the detection signal from the current detection chip 3, and generating LED dimming control signals according to external settings or detection results. The LED driver chip U2LM3409 receives dimming control signals from the control MCU1. By controlling its external MOSFETs, diodes, inductors, and other typical application circuits, it adjusts the driving current flowing through the LED, thereby achieving precise adjustment of the LED brightness. In the system, a current sensing resistor 7 is set in the positive branch of the LED, and current feedback control is realized through the CSP and CSN ports of the LM3409. A current sensing resistor 8 is set in the negative branch of the LED, and the current is collected by the INA219BID, thereby realizing the monitoring and uploading of the LED operating current. The system is also equipped with an optocoupler U4H11AA1, whose input is connected to the AC neutral and live wires at the front end of the rectifier circuit. It drives the internal LED of optocoupler 4 through current-limiting resistor 515 and resistor 616. The collector (C) and emitter (E) terminals of optocoupler 4 are connected to the system negative terminal and pull-up resistor, respectively, before being output to the MCU. This allows the control MCU1 to detect the zero-crossing signal of the AC mains power, thereby achieving synchronous control and anti-interference processing for the LED drive. The installation, connection, or setting methods of components not detailed above are all common methods. For example, protective capacitors, inductors, diodes, and other components and their connection methods are not included in the core technical features of this application. Furthermore, the specific structure, model, and coefficient indicators of all these components are inherent technologies. Any method that achieves the beneficial effect is acceptable and will not be elaborated further.

[0019] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A lighting dimming control system, comprising a voltage regulator chip (5) and a control MCU (1), characterized in that: The voltage regulator chip (5) has a rectifier structure connected to its front end. The input end of the rectifier structure is connected to the mains power and outputs DC power to the voltage regulator chip (5). The voltage regulator chip (5) outputs 3V3. The system is equipped with an LED driver chip (2) for driving LED lights. It adjusts the driving current of the LED lights according to the dimming control signal of the control MCU (1). The system is also equipped with a detection chip (3). Its detection end is connected to the circuit of the LED lights. It is used to collect the LED working current and output the current detection signal to the control MCU (1). The control MCU (1) is also connected to a light intensity sensor (6).

2. The lighting dimming control system according to claim 1, characterized in that: In the positive circuit of the LED lamp, a current sensing resistor (7) is connected in series. The CSP of the LED driver chip (2) is connected to the end of the current sensing resistor (7) away from the LED lamp, and the CSN is connected to the end of the current sensing resistor (7) close to the LED lamp.

3. A lighting dimming control system according to claim 2, characterized in that: A current sensing resistor (8) is connected in series on the line connecting the negative terminal of the LED lamp. The IN+ pin of the detection chip (3) is connected to the end of the current sensing resistor (8) closer to the LED lamp, and the IN- pin is connected to the end of the current sensing resistor (8) farther away from the LED lamp.

4. A lighting dimming control system according to claim 1, characterized in that: The system is equipped with an optocoupler (4). The two ends of the LED inside the optocoupler (4) are connected to the live and neutral wires on the front side of the rectifier structure through resistor five (15) and resistor six (16) for current limiting, respectively. The C terminal inside the optocoupler (4) is connected to the negative wire in the system, and the E terminal is connected to the CO terminal. The CO terminal is connected to one of the pins of the control MCU (1), and the CO is connected to 3V3 through resistor two (12) for pull-up.

5. A lighting dimming control system according to claim 1, characterized in that: The VIN of the LED driver chip (2) is connected to the VI terminal on the front side of the voltage regulator chip (5) for power, while the VCC terminal is connected to the VI terminal through capacitor 2 (10).

6. A lighting dimming control system according to claim 1, characterized in that: The detection chip (3) and the illuminance sensor (6) are powered by 3V3 and communicate with the control MCU (1) via a bus.

7. A lighting dimming control system according to claim 6, characterized in that: The two lines of the bus communication are pulled up by resistors three (13) and four (14) respectively.

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