An adaptive lighting circuit and a handheld light

Abstract

This invention provides an adaptive lighting circuit and a handheld light. The adaptive lighting circuit includes a radar detection module, a control module, an ambient light detection module, and a lighting module. The radar detection module outputs a human body detection signal to the control module when a human body is detected within a preset illumination range. The ambient light detection module outputs a lighting signal to the control module when the light intensity is low. The control module outputs a duty-cycle adjustable lighting brightness signal to the lighting module based on the human body detection signal and the lighting signal. The lighting module outputs light with a corresponding brightness based on the lighting brightness signal. This invention, through the control module outputting a duty-cycle adjustable lighting brightness signal to the lighting module based on the human body detection signal and the lighting signal, adjusts the working state of the lighting module when someone is present within the preset illumination range, thus protecting the eyesight of people within the preset illumination range.

Description

Technical Field

[0001] This utility model relates to the field of lighting control technology, and in particular to an adaptive lighting circuit and a handheld lighting lamp. Background Technology

[0002] As a method of providing light sources to the human visual receptors, lighting has seen the emergence of various lighting devices with the development of modern society. Handheld lights have greatly facilitated people's lives, possessing high portability and meeting the needs of specific work locations, especially at night. By integrating a portable power supply module with a high-intensity light source, reliable lighting functions can be achieved in environments without a fixed power supply or in complex conditions.

[0003] However, most existing portable lighting devices use traditional controls, that is, they are turned on and off by manually pressing mechanical switches. They do not have adaptive brightness adjustment functions. When a person is in the range of the handheld light, their eyes will be exposed to the strong light of the handheld light for a long time, which may irritate the eyes and cause symptoms such as discomfort, pain, and tearing, resulting in an uncomfortable experience. It may even cause damage to the retina and cornea, resulting in permanent vision impairment.

[0004] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an adaptive lighting circuit and a handheld light to solve the problem that existing handheld lights do not have an adaptive brightness adjustment function, which can easily cause vision damage.

[0006] The technical solution of this utility model is as follows: In a first aspect, this utility model provides an adaptive lighting circuit, comprising: a radar detection module, a control module, an ambient light detection module, and a lighting module; wherein... The radar detection module is connected to the first detection terminal of the control module and is used to detect human signals in the environment; when there are human signals in the preset illumination range of the radar detection module, the radar detection module outputs a human sensing signal to the control module. The ambient light detection module is connected to the second detection terminal of the control module and is used to detect the light intensity in the environment; when the light intensity is low, the ambient light detection module outputs a lighting signal to the control module. The output terminal of the control module is connected to the lighting module and is used to output a lighting brightness signal with an adjustable duty cycle to the lighting module according to the human body sensing signal and the lighting signal. The lighting module outputs light with a corresponding lighting brightness based on the lighting brightness signal.

[0007] In a further embodiment of this invention, the lighting module includes a constant current unit and a light-emitting unit. One end of the constant current unit is connected to the lighting brightness signal, and the other end of the constant current unit is connected to the light-emitting unit. The constant current unit outputs a constant current working signal to the light-emitting unit according to the lighting brightness signal. The light-emitting unit emits output light of corresponding illumination brightness according to the constant current working signal.

[0008] In a further improvement of this invention, the radar detection module is selected from the HLK-LD2402-A human body induction radar module.

[0009] A further feature of this invention includes a power supply module, which is connected to the control module and is used to store electrical energy and provide operating voltage to the control module.

[0010] A further feature of this invention includes a push-button switch connected to the control module. When the push-button switch is pressed, it outputs a working state control signal to the control module. The control module then turns on or off the output of a lighting brightness signal to the lighting module based on the working state control signal.

[0011] A further feature of this invention includes an indicator module connected to the control module; the control module outputs a status indicator signal to the indicator module based on the human body sensing signal and the lighting signal; the indicator module displays the working status of the lighting module based on the status indicator signal.

[0012] In a further embodiment of this invention, the indicator module includes at least one light-emitting diode, which is connected to the control module, and the status indication signal is a square wave signal.

[0013] Secondly, this utility model provides a handheld lighting lamp, which includes the adaptive lighting circuit described above.

[0014] This invention provides an adaptive lighting circuit and a handheld light. The adaptive lighting circuit includes a radar detection module, a control module, an ambient light detection module, and a lighting module. The radar detection module is connected to a first detection terminal of the control module and is used to detect human signals in the environment. When a human signal is present within a preset illumination range of the radar detection module, the radar detection module outputs a human detection signal to the control module. The ambient light detection module is connected to a second detection terminal of the control module and is used to detect the light intensity in the environment. When the light intensity is low, the ambient light detection module outputs a lighting signal to the control module. The output terminal of the control module is connected to the lighting module and is used to output a duty cycle adjustable lighting brightness signal to the lighting module based on the human detection signal and the lighting signal. The lighting module outputs light with a corresponding lighting brightness based on the lighting brightness signal. This invention uses a radar detection module to detect the presence of human signals within a preset illumination range and outputs a human body sensing signal. Then, an ambient light detection module detects the light intensity and outputs an illumination signal. Finally, the control module outputs an adjustable illumination brightness signal based on the human body sensing signal and the illumination signal to the illumination module. This allows the illumination module to adjust its working state when someone is present within the preset illumination range, thus protecting the eyesight of people within the preset illumination range. Attached Figure Description

[0015] 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 the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a flowchart illustrating the adaptive lighting circuit control method of this utility model.

[0017] Figure 2 This is a schematic diagram of the lighting circuit in a preferred embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the lighting circuit in another preferred embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the lighting circuit in another preferred embodiment of the present invention.

[0020] The markings in the attached diagram are as follows: 100, radar detection module; 200, control module; 300, ambient light detection module; 400, lighting module; 410, constant current unit; 420, light-emitting unit; 500, power supply module; 600, push-button switch; 700, indicator module. Detailed Implementation

[0021] This utility model provides an adaptive lighting circuit and a handheld light. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0022] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0023] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0024] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0025] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0026] Firstly, such as Figure 1 As shown, this utility model provides an adaptive lighting circuit control method, the steps of which include: S100: The control radar detection module determines whether there is a human body signal within the preset illumination range. If there is a human body signal, it feeds back a human body sensing signal. Specifically, the radar detection module generates high-power electromagnetic waves within its sensing range and transmits them into the air via an antenna. When these electromagnetic waves come into contact with the surface of a human body, a portion of the waves is reflected and received by the radar detection module. The radar detection module acquires and detects the reflected electromagnetic waves from the human body in a non-contact manner, determines that a human signal exists within a preset illumination range, and outputs a human body sensing signal to the control module. The sensing range direction of the radar detection module is consistent with the illumination direction of the handheld light, thus overlapping the sensing range of the radar and the preset illumination range of the handheld light. The preset illumination range is a pre-determined range within which direct illumination from the handheld light to the eyes would cause strong discomfort. The preset illumination range is a human signal detection range pre-determined based on the illumination range of the handheld light circuit. This preset illumination range can be set via software or determined according to the model of the radar detection module used. Preferably, the preset illumination range of the radar detection module is a conical space within ±60° of the horizontal and pitch angles, 10 meters directly in front of the handheld light. Similarly, the sensing range of the radar detection module is consistent with the preset illumination range, which is a conical space within ±60° of the horizontal and pitch angles, 10 meters directly in front of the handheld light. The HLK-LD2402-A human body detection radar module can be used, but other models of human body detection radar modules can also be selected.

[0027] S200: When there is no human signal within the preset illumination range, control the lighting module to emit output light at the first-level lighting brightness; Specifically, when there is no human body signal within the preset illumination range, the radar detection module does not output a human body sensing signal. At this time, the control module can determine that there is no human body signal within the preset illumination range, and the light from the handheld lamp will not affect others. At this time, the control module controls the lighting module to emit output light at maximum power, i.e., maximum lighting brightness, to improve the overall lighting effect.

[0028] S300: When a human signal is present within the preset illumination range, the ambient light detection module determines the environmental conditions. When the light intensity is less than the preset light intensity, the environmental conditions are nighttime; when the light intensity is greater than the preset light intensity, the environmental conditions are daytime. Specifically, when a human body signal is present within the preset illumination range, the radar detection module outputs a human body sensing signal. The control module can then determine that someone is within the preset illumination range based on this signal, and consequently, generate an illumination brightness signal with a corresponding duty cycle to control the working state of the lighting module. The ambient light detection module detects the light intensity in the environment and outputs a signal corresponding to that intensity. The preset light intensity is a predetermined light intensity value. The control module determines the working state of the handheld light lamp based on a comparison between the light intensity and the preset light intensity. When the light intensity is low, i.e., less than the preset light intensity, the environmental condition is defined as nighttime. This can also be used to indicate that the handheld light lamp is operating in other dimly lit environments requiring illumination. Similarly, when the light intensity is high, i.e., greater than the preset light intensity, the environmental condition is daytime, or an environment with some light but where illumination is not urgently needed.

[0029] S400. When the ambient conditions are daytime and there is a human signal within the preset illumination range, the lighting module remains off. Specifically, if the ambient conditions are daytime, it means there is already some external light present. In this case, turning on the handheld light would cause discomfort and would not provide significant illumination. Therefore, even if the button switch is triggered, the lighting module will remain off.

[0030] S500. When the ambient conditions are night and there is a human body signal within the preset illumination range, the lighting module is turned on, the duty cycle of the lighting brightness signal is reduced according to the human body sensing signal, and the lighting module is controlled to emit output light at a secondary lighting brightness according to the lighting brightness signal.

[0031] Correspondingly, when the environmental condition is nighttime, it indicates that the brightness of the environment is insufficient, and the user has a certain lighting need when holding the handheld light. Therefore, when there is a human signal within the lighting range, the lighting brightness is reduced, and a secondary lighting brightness is output. The secondary lighting brightness is less than the primary lighting brightness, and the secondary lighting brightness can include a predetermined lighting brightness range. In this way, by reducing the lighting brightness of the handheld light output, the damage of light to the human eye is reduced, while the lighting needs are met.

[0032] Furthermore, the steps of activating the lighting module when the environmental conditions are nighttime and a human body signal is present within the preset illumination range, reducing the duty cycle of the lighting brightness signal based on the human body sensing signal, and controlling the lighting module to emit output light at a secondary lighting brightness based on the lighting brightness signal, include: S510. Calculate the human body distance based on the human body signal; S520. When the distance to the human body is less than or equal to the first boundary distance, the lighting module is turned off; S530. When the distance to the human body is greater than the first boundary distance and less than or equal to the second boundary distance, the duty cycle of the lighting brightness signal is adjusted to the first duty cycle. S540. When the distance to the human body is greater than the distance to the second boundary, the duty cycle of the lighting brightness signal is adjusted to the second duty cycle, which is greater than the first duty cycle.

[0033] Specifically, the human body signal includes at least the electromagnetic wave signal reflected back by the human body and the transmission and reception times of the electromagnetic wave. The radar detection module receives the aforementioned human body signal and calculates the distance between the human body and the radar detection module based on the time difference between the transmission and reception times of the electromagnetic wave signal, thus obtaining the human body distance. The first boundary distance and the second boundary distance are predetermined distance boundary distances. When the human body distance is less than or equal to the first boundary distance, it indicates that the distance between the person and the handheld light is very close, and the output brightness of the handheld light will cause significant discomfort to the human eye. Therefore, the lighting module in working condition is immediately turned off to protect the vision of the person within the preset illumination range. Preferably, the first boundary distance is 2.8m, that is, when the human body distance is ≤2.8 meters, i.e., when someone is detected within 2.8 meters, the lighting module is not turned on. Similarly, when the human body distance is greater than the first boundary distance and less than or equal to the second boundary distance, it indicates that the person is located at a remote location within the preset illumination range, and the output brightness of the handheld light will cause a certain degree of discomfort to the human eye. Therefore, the duty cycle of the lighting brightness signal is adjusted to the first duty cycle. Preferably, the second boundary distance is 6.3m, and the first duty cycle is 5%. When a person is detected within a range of 2.80m-6.30m, the duty cycle of the PWM (Pulse Width Modulation) signal output by the control module is 5%, resulting in lower brightness of the lighting module. This illuminates the nearby space while reducing the harmful effect of the output light on the eyes. When the distance to the person is greater than the second boundary distance, it indicates that although a person exists within the preset illumination range, they are located in a more distant space. Therefore, the duty cycle of the lighting brightness signal can be adjusted to a second duty cycle, which is greater than the first duty cycle. Preferably, the second duty cycle is 10%, meaning that when a person is detected within a range of 6.30m-10m, the duty cycle of the PWM signal output by the control module is 10%. The lighting module of the handheld lamp outputs higher brightness light, illuminating a more distant space while reducing the harmful effect of the output light on the eyes.

[0034] In some preferred embodiments of this utility model, before the step of the control radar detection module determining whether a human body signal exists within a preset illumination range, and if a human body signal exists, feeding back a human body sensing signal, the following steps are included: M100: When the push-button switch is pressed, a feedback signal indicating that the lighting will be turned on is generated. M200: Based on the lighting turn-on command signal, enter the judgment program to determine whether the lighting module needs to be turned on.

[0035] Specifically, the button switch is used to control the handheld light to turn on and off. When the user presses the button to turn on the handheld light, a judgment program is pre-entered to determine whether there is a person within the preset illumination range of the environment. When the judgment program runs, it can realize the judgment process described above to determine whether there is a person and whether to turn on the lighting module if there is a person, and adjust the brightness of the output light of the lighting module.

[0036] Furthermore, the step of turning off the lighting module when the distance to the human body is less than or equal to the first boundary distance includes: S521. When the distance to the human body is less than or equal to the first boundary distance, a first lighting off command signal is fed back. S522: Control the lighting module to turn off according to the first lighting off command signal; S523. If the button switch is pressed, the control indicator module will flash to indicate that there is a human body signal within the preset irradiation range and the distance of the human body is less than or equal to the first boundary distance.

[0037] Specifically, when the ambient condition is nighttime and a lighting signal is present in the control module, the lighting module operates. At this time, if someone suddenly enters the illumination space of the handheld light, or if someone from a distance walks into the illumination space and gradually approaches the handheld light, the distance to the person is calculated using the human body signal. When the distance to at least one person decreases or becomes less than or equal to the first boundary distance, the radar detection module sends back a first lighting off indication signal. Based on this signal, the control module controls the lighting module to turn off. Even if the button switch is pressed again, the lighting module will not be turned on due to the presence of the first lighting off instruction; the indicator module will flash, indicating that the light is within the preset illumination range.

[0038] Furthermore, the step of keeping the lighting module off when the environmental conditions are daytime and there is a human signal within the preset illumination range includes: S410: When a human signal is present within the preset illumination range, a second illumination shutdown command signal is fed back; S420. If both the second lighting off command signal and the lighting on command signal are received simultaneously, the lighting module is kept off and the indicator module flashes to indicate the presence of a human body signal within the preset illumination range.

[0039] Correspondingly, when the lighting module is not activated, the handheld light does not output light. When the user attempts to activate the lighting module via the button switch, the radar detection module detects whether a human signal is present within the preset illumination range. If a human signal is present within the preset illumination range, and the environmental conditions are clearly daytime, it indicates that there is already some external light present. Activating the handheld light in this situation would cause discomfort and would not provide significant illumination. At this point, the main control module receives a second lighting off command signal. Even if the button switch is triggered and outputs a lighting on command signal, the control module keeps the lighting module off and simultaneously controls the indicator module to flash, indicating the presence of someone within the preset illumination range.

[0040] In summary, this utility model uses a radar detection module to determine whether there is a human signal within a preset illumination range, and then uses an ambient light detection module to determine the environmental conditions. Based on the environmental changes before and during the operation of the handheld lighting lamp, the working state of the lighting module can be adjusted accordingly to reduce the damage of the output light to the human eye.

[0041] Secondly, please refer to Figure 2 This utility model provides an adaptive lighting circuit for implementing the aforementioned adaptive lighting circuit control method. It includes a radar detection module 100, a control module 200, an ambient light detection module 300, and a lighting module 400. The radar detection module 100 is connected to a first detection terminal of the control module 200, used to detect human body signals in the environment, and outputs a human body sensing signal to the control module 200 when a human body signal is present within a preset illumination range. The ambient light detection module 300 is connected to a second detection terminal of the control module 200, used to detect the light intensity in the environment, and outputs a lighting signal to the control module 200 when the light intensity is less than a preset light intensity. The output terminal of the control module 200 is connected to the lighting module 400, used to output a duty cycle adjustable lighting brightness signal to the lighting module 400 based on the human body sensing signal and the lighting signal. The lighting module 400 outputs output light with a corresponding lighting brightness based on the lighting brightness signal.

[0042] In this embodiment, the radar detection module 100 can detect whether there is a human body signal in the environment, especially within the preset illumination range of the output light, and convert it into a digital signal, which is then output to the control module 200, i.e., a human body sensing signal. The human body sensing signal includes the number of corresponding human body signals and the distance between the human body and the radar detection module 100. Specifically, when a human body signal moves within the preset illumination range, its human body sensing signal data changes accordingly and is collected by the radar detection module 100 before being output to the control module 200. When a human body signal moves outside the preset illumination range, it will not be collected by the radar detection module 100, meaning there is no human body signal within the preset illumination range. In this case, the radar detection module 100 will not generate a human body sensing signal, and the corresponding microcontroller will not collect the human body sensing signal.

[0043] The ambient light detection module 300 has a response or conversion function to external light signals or light radiation. It is used to detect the light intensity in the environment and convert it into a voltage signal output accordingly. When the ambient light intensity is high, assuming the environment is daytime, the demand for light from a handheld lamp is low, and the ambient light detection module 300 does not output a lighting signal. Similarly, when the ambient light intensity is low, assuming the environment is nighttime, the demand for light from a handheld lamp is relatively higher, and the ambient light detection module 300 outputs a lighting signal. Based on this, the microcontroller can determine whether there is a human signal in the environment and the preset illumination range, as well as the distance and proximity of the human signal, based on the received lighting signal and human body sensing signal. If a human signal is present within the preset illumination range, the brightness of the output light of the lighting module 400 is reduced to control the working state of the lighting circuit.

[0044] The radar detection module 100 uses FMCW frequency-modulated continuous wave, combined with radar signal processing and a built-in intelligent human body sensing algorithm, to detect human targets within a set space, update the detection data in real time, and feed it back to the control module 200. The control module 200 adjusts the lighting brightness signal accordingly based on the human body sensing data output from the radar detection module 100, thereby controlling the power of the light-emitting module. Its radar detection range is 10 meters, with a 5-meter range for presence sensing and a 10-meter range for motion sensing. Its coverage area is a conical space within ±60° of the horizontal and vertical angles, providing a large detection angle and enabling coverage of the handheld lighting direction. Preferably, the radar detection module 100 uses the HLK-LD2402-A human body sensing radar module; other human body sensing radar modules with similar radar detection ranges can also be used.

[0045] Furthermore, please refer to the following: Figure 2 and Figure 3 The lighting module 400 includes a constant current unit 410 and a light-emitting unit 420. One end of the constant current unit 410 is connected to the lighting brightness signal, and the other end of the constant current unit 410 is connected to the light-emitting unit 420. The constant current unit 410 outputs a constant current working signal to the light-emitting unit 420 according to the lighting brightness signal. The light-emitting unit 420 emits output light corresponding to the lighting brightness according to the constant current working signal.

[0046] Specifically, the constant current unit 410 is used to receive the lighting brightness signal output by the control module 200 and convert the lighting brightness signal into a current signal with a constant current and the same duty cycle, i.e., a constant current lighting brightness signal. The constant current lighting brightness signal is used to drive the light-emitting unit 420 with a constant current. The light-emitting unit 420 is at least one light-emitting diode, which emits output light of corresponding brightness according to the duty cycle of the constant current lighting brightness signal.

[0047] Further, please refer to Figure 4 The adaptive lighting circuit also includes a power supply module 500, which is connected to the control module 200 and is used to store electrical energy and output operating voltage to the control module 200. The battery module can be a lithium battery or other rechargeable batteries, which will not be elaborated upon in this invention.

[0048] In further embodiments of some preferred embodiments of this utility model, please continue to refer to... Figure 4 The adaptive lighting circuit also includes a push-button switch 600, which is connected to the control module 200 and outputs a working state adjustment signal to the control module 200 when pressed. The control module 200 turns the output of the lighting brightness signal to the lighting module 400 on or off according to the working state adjustment signal. Specifically, taking turning on the lighting as an example, when the control module 200 receives the working state adjustment signal, it determines that the user intends to turn on the handheld light. At this time, the control module 200 begins to determine the working state of the lighting module 400 based on the information transmitted by the radar detection module 100 and the ambient light detection module 300.

[0049] Furthermore, the adaptive lighting circuit may also include an indicator module 700, which is connected to the control module 200. The control module 200 outputs a status indicator signal to the indicator module 700 based on the human body sensing signal and the lighting signal. The indicator module 700 displays the operating status of the lighting module 400 based on the status indicator signal. The indicator module 700 includes at least one light-emitting diode (LED), which is connected to the control module 200. The status indicator signal is a square wave signal.

[0050] Specifically, the light-emitting diode (LED) serves as an indicator light and indicates the working status. Preferably, the indicator module 700 may include at least one green LED, one blue LED, and one red LED. The anodes of the green, blue, and red LEDs are respectively connected to the control module 200, while the cathodes of the green, blue, and red LEDs are grounded and independently receive control signals transmitted from the control module 200 to characterize the working status of the handheld light. For example, a flashing green LED indicates that the handheld light is charging, a constantly lit green LED indicates that the handheld light is fully charged, a constantly lit blue LED indicates that the lighting module 400 is on, and a flashing red LED indicates the presence of someone within the detection range.

[0051] It should be noted that the specific working circuits and implementation methods of the indicator module 700, constant current unit 410, light-emitting unit 420, push button switch 600 and power module 500 described above are existing technologies. Those skilled in the art can undoubtedly understand their implementation methods and select modular circuits to implement the functions of the corresponding modules. This utility model will not elaborate further here.

[0052] Specifically, the control module 200 can be a microcontroller unit (MCU) or any programmable digital signal processing (DSP) chip. The control module 200 internally contains an integrated circuit module for generating PWM signals. For example, the microcontroller module 200 can be an MCU chip of model CIU32F003, or it can be an STM32 series, GD32 series, or STC series microcontroller chip; further details will not be elaborated upon here.

[0053] When the user presses the button switch 600, the control module 200 receives a lighting turn-on command signal via a serial port. This signal drives the lighting module 400. At this time, the ambient light sensor in the ambient light detection module 300 outputs a lighting signal. The control module 200 determines whether the ambient conditions are daytime or nighttime based on the lighting signal received via the serial port. It then connects to the radar detection module 100 via the serial port and uses the human body detection signal output from the radar detection module 100 to determine if anyone is present within the preset illumination range. Based on the environmental conditions and the presence of anyone, the control module 200 decides whether to output light intensity. If it is daytime and the radar detection module 100 detects someone, it sends a signal back to the control module 200. The control module 200 does not output a lighting brightness signal to illuminate the lighting module 400, and the red LED in the indicator module 700 flashes to indicate the presence of someone within the detection range.

[0054] At night, when the radar detection module 100 detects the presence of a person, it sends a signal to the control module 200. The control module 200 outputs a PWM signal with a corresponding duty cycle based on the distance to the person to control the brightness of the lighting module 400, preventing harm to the eyes of people within the preset illumination range. When a person within the preset illumination range approaches to a certain distance, the lighting module 400 turns off, and the red LED in the indicator module 700 flashes to indicate the presence of someone within the detection range.

[0055] Conversely, when no one is present in the detection range, regardless of whether the environment is day or night, the control module 200 outputs a PWM signal with a 100% duty cycle, and the lighting module 400 outputs full-power high-intensity light, enhancing the visibility range.

[0056] Thirdly, this utility model also provides a handheld lighting lamp, which includes the adaptive lighting circuit described above. The specific implementation of the adaptive lighting circuit is as described in the description, and will not be repeated here.

[0057] This invention provides an adaptive lighting circuit and a handheld light. The adaptive lighting circuit includes a radar detection module, a control module, an ambient light detection module, and a lighting module. The radar detection module is connected to a first detection terminal of the control module and is used to detect human signals in the environment. When a human signal is present within a preset illumination range of the radar detection module, the radar detection module outputs a human detection signal to the control module. The ambient light detection module is connected to a second detection terminal of the control module and is used to detect the light intensity in the environment. When the light intensity is low, the ambient light detection module outputs a lighting signal to the control module. The output terminal of the control module is connected to the lighting module and is used to output a duty cycle adjustable lighting brightness signal to the lighting module based on the human detection signal and the lighting signal. The lighting module outputs light with a corresponding lighting brightness based on the lighting brightness signal. This invention uses a radar detection module to detect the presence of human signals within a preset illumination range and outputs a human body sensing signal. Then, an ambient light detection module detects the light intensity and outputs an illumination signal. Finally, the control module outputs an adjustable illumination brightness signal based on the human body sensing signal and the illumination signal to the illumination module. This allows the illumination module to adjust its working state when someone is present within the preset illumination range, thus protecting the eyesight of people within the preset illumination range.

[0058] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An adaptive lighting circuit, characterized by, include: The system comprises a radar detection module, a control module, an ambient light detection module, and a lighting module; among which, The radar detection module is connected to the first detection end of the control module and is used to detect human signals in the environment, and output a human induction signal to the control module when there are human signals in the preset illumination range. The ambient light detection module is connected to the second detection terminal of the control module, and is used to detect the light intensity in the environment, and output a lighting signal to the control module when the light intensity is less than the preset light intensity; The output of the control module is connected to the lighting module and is used to output a lighting brightness signal with an adjustable duty cycle to the lighting module according to the human body sensing signal and the lighting signal. The lighting module outputs light with a corresponding lighting brightness based on the lighting brightness signal.

2. The adaptive lighting circuit according to claim 1, characterized in that, The lighting module includes a constant current unit and a light-emitting unit. One end of the constant current unit is connected to the lighting brightness signal, and the other end of the constant current unit is connected to the light-emitting unit. The constant current unit outputs a constant current working signal to the light-emitting unit according to the lighting brightness signal. The light-emitting unit emits output light of corresponding illumination brightness according to the constant current working signal.

3. The adaptive lighting circuit according to claim 1, characterized in that, The radar detection module selected is the HLK-LD2402-A human body sensing radar module.

4. The adaptive lighting circuit according to claim 1, characterized in that, It also includes a power module, which is connected to the control module and is used to store electrical energy and output operating voltage to the control module.

5. The adaptive lighting circuit according to claim 1, characterized in that, It also includes a push-button switch, which is connected to the control module and outputs a working status adjustment signal to the control module when pressed; the control module turns on or off the output of the lighting brightness signal to the lighting module according to the working status adjustment signal.

6. The adaptive lighting circuit according to claim 1, characterized in that, It also includes an indicator module, which is connected to the control module; the control module outputs a status indicator signal to the indicator module based on the human body sensing signal and the lighting signal; the indicator module displays the working status of the lighting module based on the status indicator signal.

7. The adaptive lighting circuit according to claim 6, characterized in that, The indicator module includes at least one light-emitting diode, which is connected to the control module. The status indication signal is a square wave signal.

8. A handheld lighting lamp, characterized in that, Includes the adaptive lighting circuit as described in any one of claims 1-7.

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