A human body sensing-based intelligent dimming control device

Abstract

The utility model discloses a kind of intelligent dimming control device based on human body response, by adopting double pyroelectric infrared sensor, each is equipped with independent fresnel lens, both can be arranged in different positions or angle cooperative work, can cover more wide space area, effectively reduce detection blind area, independent fresnel lens can be designed according to sensor position and detection demand pertinence, adjust focal length, viewing angle and the like parameter, make sensor accurate receiving human infrared radiation, optimize for different direction and distance human activity, improve detection sensitivity and accuracy, whether there is human existence according to whether the signal strength output by human body response module exceeds the set threshold value by microcontroller module, this kind of judgment based on signal strength is more accurate, LED load module receives the electric energy and PWM signal of dimming drive module, according to the duty ratio change luminous brightness of PWM signal, can realize the smooth and accurate regulation of LED light brightness, provide more intelligent, comfortable lighting experience for user.

Description

Technical Field

[0001] This utility model relates to the field of intelligent dimming control technology, and in particular to an intelligent dimming control device based on human body sensing. Background Technology

[0002] In today's society, lighting systems are widely used in various places, from residential environments to large public buildings, and their importance is self-evident. However, existing human body sensing-based lighting control devices have certain problems in terms of sensing accuracy. Due to the use of a single pyroelectric infrared sensor, its detection range and angle are limited, and it is easy to have detection blind spots. For example, in some large spaces, a single sensor may not be able to cover all areas, resulting in the inability to detect human movement in some areas in a timely manner, thus affecting the lighting control effect. In addition, the dimming control is not precise enough, and it can only achieve simple on / off control or limited brightness adjustment. For example, some devices can only divide the light into two states, on and off, or can only switch between a few fixed brightness levels, and cannot perform precise dimming control based on factors such as the intensity of human activity and ambient light. Utility Model Content

[0003] In view of this, this utility model proposes an intelligent dimming control device based on human body sensing, which can solve the defects of existing technologies, such as the easy occurrence of detection blind spots and insufficient precision in dimming control.

[0004] The technical solution of this utility model is implemented as follows:

[0005] A human body sensing-based intelligent dimming control device includes:

[0006] The human body sensing module employs two pyroelectric infrared sensors and a signal processing circuit. Each pyroelectric infrared sensor is equipped with an independent Fresnel lens for detecting human activity. The signal processing circuit is used to amplify and filter the weak electrical signals output by the pyroelectric infrared sensors.

[0007] The microcontroller module is used to determine whether a human body is present based on whether the signal strength output by the human body sensing module exceeds a set threshold.

[0008] The dimming driver module is used to drive the LED load module based on the judgment result of the microcontroller module.

[0009] The LED load module is used to electrically connect with the dimming drive module, receive the electrical energy and PWM signal output by the dimming drive module, and change its brightness according to the duty cycle of the PWM signal.

[0010] The power management module provides operating voltage for the microcontroller module and the human body sensing module.

[0011] As a further optional solution for the aforementioned human body sensing-based intelligent dimming control device, the Fresnel lens includes a short focal length Fresnel lens and a long focal length Fresnel lens. The short focal length Fresnel lens is paired with a pyroelectric infrared sensor for close-range detection, and the long focal length Fresnel lens is paired with a pyroelectric infrared sensor for long-range detection.

[0012] As a further optional solution for the aforementioned human body sensing-based intelligent dimming control device, a metal shielding ring is provided around the pyroelectric infrared sensor to reduce the impact of external electromagnetic interference on the pyroelectric infrared sensor signal.

[0013] As a further optional embodiment of the aforementioned human body sensing-based intelligent dimming control device, the signal processing circuit includes a BISS0001 chip and its peripheral circuitry.

[0014] As a further optional solution to the aforementioned human body sensing-based intelligent dimming control device, the dimming drive module includes an AC1003AI6 chip and its peripheral circuitry.

[0015] As a further optional solution for the aforementioned human body sensing-based intelligent dimming control device, the LED load module is composed of several LED beads connected in series, and the LED beads are single color temperature beads.

[0016] As a further optional solution for the aforementioned human body sensing-based intelligent dimming control device, the LED beads are fixed to the heat-dissipating aluminum substrate with thermally conductive adhesive, and the heat-dissipating aluminum substrate is fixedly connected to the device housing with screws.

[0017] As a further optional solution to the aforementioned human body sensing-based intelligent dimming control device, the power management module includes a linear voltage regulator chip and its peripheral circuitry.

[0018] The beneficial effects of this invention are as follows: It employs two pyroelectric infrared sensors, each equipped with an independent Fresnel lens. The two sensors can be arranged at different positions or angles, and through collaborative work, they can cover a wider spatial area, effectively reducing detection blind spots. The independent Fresnel lens can be specifically designed according to the sensor's position and detection needs, adjusting its focal length, viewing angle, and other parameters to enable the sensor to more accurately receive infrared radiation emitted by the human body. Independent lenses at different positions can be optimized for human activity in different directions and at different distances, improving detection sensitivity and accuracy, and reducing missed detections due to environmental factors or the specific location of human activity. Simultaneously, the microcontroller module determines the presence of a human body based on whether the signal strength output by the human body sensing module exceeds a set threshold. This signal strength-based judgment method is more accurate. Furthermore, the LED load module receives electrical energy and PWM signals output by the dimming drive module, changing its brightness according to the duty cycle of the PWM signal. The PWM dimming method has advantages such as high dimming accuracy, good linearity, and no flicker, enabling smooth and precise adjustment of LED light brightness. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the composition of an intelligent dimming control device based on human body sensing according to this utility model;

[0021] Figure 2 This is a circuit diagram of the signal processing circuit of this utility model;

[0022] Figure 3 This is a circuit diagram of the dimming drive module of this utility model;

[0023] Figure 4 This is a circuit diagram of the signal power management module of this utility model. Detailed Implementation

[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] refer to Figures 1 to 4 A smart dimming control device based on human body sensing, comprising:

[0026] The human body sensing module employs two pyroelectric infrared sensors and a signal processing circuit. Each pyroelectric infrared sensor is equipped with an independent Fresnel lens for detecting human activity. The signal processing circuit is used to amplify and filter the weak electrical signals output by the pyroelectric infrared sensors.

[0027] The microcontroller module is used to determine whether a human body is present based on whether the signal strength output by the human body sensing module exceeds a set threshold.

[0028] The dimming driver module is used to drive the LED load module based on the judgment result of the microcontroller module.

[0029] The LED load module is used to electrically connect with the dimming drive module, receive the electrical energy and PWM signal output by the dimming drive module, and change its brightness according to the duty cycle of the PWM signal.

[0030] The power management module provides operating voltage for the microcontroller module and the human body sensing module.

[0031] In this embodiment, two pyroelectric infrared sensors, each equipped with an independent Fresnel lens, are used. The two sensors can be arranged at different positions or angles, and through collaborative work, they can cover a wider spatial area, effectively reducing detection blind spots. The independent Fresnel lens can be specifically designed according to the sensor's position and detection needs, adjusting its focal length, viewing angle, and other parameters to enable the sensor to more accurately receive infrared radiation emitted by the human body. Independent lenses at different positions can be optimized for human activities in different directions and at different distances, improving detection sensitivity and accuracy, and reducing missed detections caused by environmental factors or special human activity positions. At the same time, the microcontroller module determines whether a human body is present based on whether the signal strength output by the human body sensing module exceeds a set threshold. This signal strength-based judgment method is more accurate. In addition, the LED load module receives electrical energy and PWM signals output by the dimming drive module, and changes its brightness according to the duty cycle of the PWM signal. The PWM dimming method has advantages such as high dimming accuracy, good linearity, and no flicker, enabling smooth and precise adjustment of LED light brightness.

[0032] Preferably, the Fresnel lens includes a short focal length Fresnel lens and a long focal length Fresnel lens. The short focal length Fresnel lens is paired with a pyroelectric infrared sensor for short-range detection, and the long focal length Fresnel lens is paired with a pyroelectric infrared sensor for long-range detection.

[0033] In this embodiment, the combination of short-focal-length Fresnel lenses and long-focal-length Fresnel lenses enables the device to effectively detect areas at different distances. The short-focal-length lens focuses on the near-field range, quickly capturing human activities close to the sensor, while the long-focal-length lens excels at detecting distant areas, expanding the overall detection range of the device. This design avoids detection blind spots caused by the limited detection range of a single focal length lens, ensuring that in a large space, regardless of the human body's position, it can be detected promptly and accurately. For example, in large warehouses, shopping malls, and other places, this all-around detection capability ensures that the lighting system responds promptly to human activities. Through the division of labor and cooperation of different focal length lenses, the device can more accurately locate the human body's position in space. The short-focal-length lens is more sensitive to near-field human activities and can quickly respond to near-field human movement, while the long-focal-length lens can perform preliminary detection of distant human bodies. This accurate acquisition of position information helps the dimming drive module to more rationally adjust the brightness of the LED load module, achieving more intelligent and user-friendly lighting control.

[0034] It should be noted that integrating the pyroelectric infrared sensor and a Fresnel lens with a specific focal length into a single package forms a complete sensor module. This module is compact and easy to install. Furthermore, if you want to quickly detect people approaching near the door (e.g., within a range of 1-3 meters), you can use a short focal length Fresnel lens with a pyroelectric infrared sensor. To detect people approaching at a greater distance from the door (e.g., 5-10 meters), you can use a long focal length Fresnel lens with a pyroelectric infrared sensor.

[0035] Preferably, a metal shielding ring is provided around the pyroelectric infrared sensor to reduce the influence of external electromagnetic interference on the pyroelectric infrared sensor signal.

[0036] In this embodiment, the metal shielding ring effectively shields external electromagnetic interference, making the signal received by the pyroelectric infrared sensor purer. In practical application environments, various electromagnetic radiation sources exist, such as electronic devices and power lines. These electromagnetic interferences can mix into the sensor signal, causing signal distortion. The metal shielding ring acts like a "protective shield," blocking external electromagnetic waves and reducing the impact of interference signals on the sensor's output signal. This allows the weak electrical signal output by the sensor to more accurately reflect the infrared radiation generated by human activity. Due to the improved signal quality, the microcontroller module can receive more accurate and clearer human body sensing signals, thereby more accurately determining whether a human body is present. In intelligent dimming control, accurate sensing results are the basis for achieving reasonable dimming. For example, when someone enters the detection area, the sensor can detect human activity promptly and accurately. The microcontroller module reacts quickly based on the received signal, controlling the dimming drive module to adjust the brightness of the LED load module, avoiding misjudgments or missed judgments caused by signal interference, and improving the response speed and accuracy of the entire device.

[0037] Preferably, the signal processing circuit includes a BISS0001 chip and its peripheral circuits.

[0038] Preferably, the dimming drive module includes an AC1003AI6 chip and its peripheral circuitry.

[0039] Preferably, the LED load module is composed of several LED beads connected in series, and the LED beads are single color temperature beads.

[0040] Preferably, the LED beads are fixed to the heat-dissipating aluminum substrate with thermally conductive adhesive, and the heat-dissipating aluminum substrate is fixedly connected to the device housing with screws.

[0041] In this embodiment, the thermally conductive adhesive has excellent thermal conductivity, enabling it to quickly conduct the heat generated by the LED beads during operation to the heat-dissipating aluminum substrate. During operation, approximately 70%-80% of the electrical energy of the LED beads is converted into heat energy. If heat cannot be dissipated in time, the temperature of the LED beads will rise, affecting their luminous efficiency and lifespan. The use of thermally conductive adhesive greatly improves the heat conduction efficiency, ensuring that heat can be quickly transferred from the LED beads to the heat-dissipating aluminum substrate. The heat-dissipating aluminum substrate typically has a large surface area, allowing heat to be quickly dispersed after it is transferred to the substrate. Good heat dissipation performance and a stable structure can effectively protect the LED beads. Excessive temperature will accelerate the aging of the internal materials of the LED beads, shortening their lifespan. Through the heat dissipation effect of the thermally conductive adhesive and the heat-dissipating aluminum substrate, as well as the structural stability of the screw-fixed connection, the operating temperature of the LED beads can be controlled within a reasonable range, reducing the impact of thermal stress on the LED beads and thus extending their lifespan.

[0042] Preferably, the power management module includes a linear voltage regulator chip and its peripheral circuitry.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A smart dimming control device based on human body sensing, characterized in that, include: The human body sensing module employs two pyroelectric infrared sensors and a signal processing circuit. Each pyroelectric infrared sensor is equipped with an independent Fresnel lens for detecting human activity. The signal processing circuit is used to amplify and filter the weak electrical signals output by the pyroelectric infrared sensors. The microcontroller module is used to determine whether a human body is present based on whether the signal strength output by the human body sensing module exceeds a set threshold. The dimming driver module is used to drive the LED load module based on the judgment result of the microcontroller module. The LED load module is used to electrically connect with the dimming drive module, receive the electrical energy and PWM signal output by the dimming drive module, and change its brightness according to the duty cycle of the PWM signal. The power management module provides operating voltage for the microcontroller module and the human body sensing module.

2. The intelligent dimming control device based on human body sensing according to claim 1, characterized in that, The Fresnel lens includes a short focal length Fresnel lens and a long focal length Fresnel lens. The short focal length Fresnel lens is paired with a pyroelectric infrared sensor for short-range detection, and the long focal length Fresnel lens is paired with a pyroelectric infrared sensor for long-range detection.

3. The intelligent dimming control device based on human body sensing according to claim 2, characterized in that, A metal shielding ring is installed around the pyroelectric infrared sensor to reduce the impact of external electromagnetic interference on the pyroelectric infrared sensor signal.

4. The intelligent dimming control device based on human body sensing according to claim 3, characterized in that, The signal processing circuit includes the BISS0001 chip and its peripheral circuits.

5. The intelligent dimming control device based on human body sensing according to claim 4, characterized in that, The dimming drive module includes an AC1003AI6 chip and its peripheral circuitry.

6. The intelligent dimming control device based on human body sensing according to claim 5, characterized in that, The LED load module is composed of several LED beads connected in series, and the LED beads are single color temperature beads.

7. The intelligent dimming control device based on human body sensing according to claim 6, characterized in that, The LED beads are fixed to the heat-dissipating aluminum substrate with thermally conductive adhesive, and the heat-dissipating aluminum substrate is fixed to the device housing with screws.

8. The intelligent dimming control device based on human body sensing according to claim 7, characterized in that, The power management module includes a linear voltage regulator chip and its peripheral circuitry.

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