Intelligent security lighting control device

Abstract

An intelligent security lighting control device according to an embodiment of the present invention comprises: a signal control module that outputs a variable pulse width modulation (PWM) signal for LED lighting control; and a lighting module that operates according to the variable PWM signal. The signal control module includes a plurality of sub-signal generation units and a signal selection unit. The plurality of sub-signal generation units generate PWM signals having different frequencies or duty ratios. The signal selection unit generates the variable PWM signal on the basis of the PWM signals generated by the plurality of sub-signal generation units.

Description

Intelligent security lighting control device

[0001] The present invention relates to a lighting control device, and more specifically, to a lighting control device comprising a circuit structure for performing PWM control to continuously vary the frequency and duty ratio of lighting.

[0002] The content described in this section merely provides background information regarding an embodiment of the present invention and does not constitute prior art.

[0003] As portable cameras develop various capabilities and become smaller, there is always a risk that personal privacy may be infringed upon due to photography. In places where personal privacy is expected to be protected—such as private activity spaces like accommodations, changing rooms, and restrooms, or public places like performance venues and exhibition halls—the filming and distribution of private activities or subjects protected by copyright without the individual's consent infringes upon their right to portrait or privacy, and serious secondary damage occurs as such images spread rapidly through the internet and social media.

[0004] The present invention, developed to solve these problems, provides a lighting control circuit capable of disrupting a camera's automatic illuminance recognition system and consequently degrading image quality by continuously varying the frequency and duty cycle of the lighting.

[0005] The present invention has been devised in response to the aforementioned background technology and aims to provide a lighting control device that continuously varies the frequency and duty ratio through PWM control.

[0006] However, the problems to be solved by the present invention are not limited to those mentioned above, and other unmentioned problems may be clearly understood based on the description below.

[0007] As a technical means for achieving the above-mentioned technical problem, an intelligent security lighting control device according to an embodiment of the present invention includes a signal control module that outputs a variable PWM (Pulse Width Modulation) signal for LED lighting control and a lighting module that operates according to the variable PWM signal. The signal control module includes a plurality of sub-signal generation units and a signal selection unit, wherein the plurality of sub-signal generation units each generate PWM signals with different frequencies or duty ratios, and the signal selection unit generates the variable PWM signal based on the PWM signals generated by the plurality of sub-signal generation units.

[0008] Alternatively, the sub-signal generation unit includes a frequency control circuit, wherein the frequency control circuit includes a plurality of capacitors and a plurality of switches connected to each of the plurality of capacitors to selectively connect the plurality of capacitors in parallel to control the capacitance of the frequency control circuit, and wherein the frequency of the PWM signal decreases when the capacitance of the frequency control circuit increases, and the frequency of the PWM signal increases when the capacitance of the frequency control circuit decreases.

[0009] Alternatively, the sub-signal generation unit includes a duty control circuit, wherein the duty control circuit includes a variable resistor connected to the frequency control circuit, a first charging diode connected to the variable resistor to allow current to flow from the supply voltage through the variable resistor to the frequency control circuit, and a second discharging diode connected to the variable resistor to allow current to flow from the frequency control circuit toward the variable resistor to discharge, and wherein the duty ratio of the PWM signal decreases when the resistance value of the variable resistor increases, and the duty ratio of the PWM signal increases when the resistance value of the variable resistor decreases.

[0010] Alternatively, the sub-signal generation unit includes a PWM generation circuit, wherein the PWM generation circuit outputs a high-level signal while the capacitor of the frequency control circuit is being charged through the first diode and outputs a low-level signal while the capacitor of the frequency control circuit is being discharged through the second diode, and controls whether the frequency control circuit is being charged or discharged by comparing the voltage applied to the frequency control circuit with the supply voltage.

[0011] Alternatively, the signal selection unit is characterized by sequentially selecting and outputting the plurality of sub-signal generation units at a preset period.

[0012] Alternatively, the plurality of switches are characterized by including MOSFET switching elements controlled by a microcontroller.

[0013] Alternatively, the lighting module comprises one or more of a red LED unit, a blue LED unit, a green LED unit, or a white LED unit, and the plurality of sub-signal generating units comprises a first sub-signal generating unit controlling the red LED unit, a second sub-signal generating unit controlling the blue LED unit, a third sub-signal generating unit controlling the green LED unit, and a fourth sub-signal generating unit controlling the white LED unit.

[0014] Alternatively, the plurality of sub-signal generation units output PWM signals of different frequencies or duty ratios, and the signal selection unit controls the lighting module by sequentially selecting the plurality of sub-signal generation units or by selecting and combining two or more of them.

[0015] Alternatively, the signal selection unit is characterized by including an AND gate for PWM signal selection, a diode connected to a PWM signal output terminal, and a pull-down resistor for each of the plurality of sub-signal generation units.

[0016] Alternatively, the PWM signal is characterized by varying the frequency or duty ratio while maintaining the average light intensity per unit control interval of the lighting module at a preset light intensity value.

[0017] According to the means for solving the problem of the present invention described above, the frequency and duty cycle of the lighting can be continuously varied to confuse the automatic exposure or focus adjustment of the camera, although this is not perceived by the human eye.

[0018] The present invention can determine and correct the phase difference of PWM signals without separate communication between lights in a situation where multiple lights are controlled.

[0019] FIG. 1 is a block diagram illustrating the configuration of a lighting control device according to one embodiment of the present invention.

[0020] FIG. 2 is a block diagram illustrating a signal control module included in a lighting control device according to one embodiment of the present invention.

[0021] FIG. 3 is a circuit diagram illustrating a sub-signal generation unit according to one embodiment of the present invention.

[0022] FIG. 4 is a circuit diagram illustrating a sub-signal generation unit according to an embodiment of the present invention.

[0023] FIG. 5 is a circuit diagram illustrating a lighting control device according to one embodiment of the present invention.

[0024] FIG. 6 is a block diagram illustrating a lighting control device according to one embodiment of the present invention.

[0025] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art (hereinafter, those skilled in the art) can easily implement them. The embodiments presented in the present invention are provided to enable those skilled in the art to use or implement the contents of the present invention. Accordingly, various modifications to the embodiments of the present invention will be obvious to those skilled in the art. That is, the present invention can be embodied in various different forms and is not limited to the embodiments below.

[0026] Throughout the specification of the present invention, identical or similar reference numerals refer to identical or similar components. Additionally, to clearly explain the present invention, reference numerals in the drawings that are unrelated to the description of the present invention may be omitted.

[0027] The term "or" used in the present invention is intended to mean an implicit "or" rather than an exclusive "or." That is, unless otherwise specified in the present invention or its meaning is unclear from the context, "X uses A or B" should be understood to mean one of the natural implicit substitutions. For example, unless otherwise specified in the present invention or its meaning is unclear from the context, "X uses A or B" may be interpreted as any one of the cases where X uses A, X uses B, or X uses both A and B.

[0028] The term "at least one of A or B" used in the present invention should be interpreted as referring to A, B, and combinations of A and B.

[0029] The term "and / or" as used in the present invention should be understood to refer to and include all possible combinations of one or more of the enumerated related concepts.

[0030] The terms “comprising” and / or “comprising” as used in the present invention should be understood to mean the presence of specific features and / or components. However, the terms “comprising” and / or “comprising” should be understood not to exclude the presence or addition of one or more other features, other components and / or combinations thereof.

[0031] Where not otherwise specified in the present invention or where it is not clear from the context that the singular form indicates, the singular should generally be interpreted as including "one or more."

[0032] The term "the N (N is a natural number)" used in the present invention can be understood as an expression used to distinguish the components of the present invention from one another according to certain criteria, such as functional perspectives, structural perspectives, or convenience of explanation. For example, components performing different functional roles in the present invention may be distinguished as the first component or the second component. However, components that are substantially identical within the technical scope of the present invention but need to be distinguished for the convenience of explanation may also be distinguished as the first component or the second component.

[0033] Meanwhile, the terms "module" or "unit" used in the present invention may be understood as referring to an independent functional unit that processes computing resources, such as a computer-related entity, firmware, software or a part thereof, hardware or a part thereof, or a combination of software and hardware. In this case, "module" or "unit" may be a unit composed of a single element, or a unit expressed as a combination or set of multiple elements. For example, in a narrow sense, "module" or "unit" may refer to a hardware element of a computing device or a set thereof, an application program that performs a specific function of software, a procedure implemented through software execution, or a set of instructions for program execution. Furthermore, in a broad sense, "module" or "unit" may refer to the computing device itself that constitutes the system, or an application executed on the computing device. However, since the above-described concepts are merely examples, the concepts of "module" or "unit" may be defined in various ways within a scope understandable to those skilled in the art based on the content of the present invention.

[0034] The explanation of the foregoing terms is intended to aid in understanding the present invention. Therefore, it should be noted that unless the foregoing terms are explicitly stated as matters limiting the content of the present invention, they are not intended to be used in the sense of limiting the technical concept of the present invention.

[0035] An embodiment of the present invention will be described in detail below with reference to the attached drawings.

[0036] FIG. 1 is a block diagram illustrating the configuration of a lighting control device according to one embodiment of the present invention.

[0037] Referring to FIG. 1, the lighting control device (100) may include a lighting module (110), a signal control module (120), a power conversion module (130), and a power supply module (140).

[0038] The lighting module (110) may include various LED modules and may be composed of RGB (Red, Blue, Green) LEDs or RGBW (Red, Blue, Green, White) LED combinations.

[0039] The signal control module (120) can generate a PWM signal and adjust the frequency and duty cycle. The signal control module (120) may include a counter, an oscillator circuit, a logic circuit, or various components (e.g., an NE555 timer CD4017b counter). The signal control module (120) can be understood as a constituent unit including hardware and / or software for performing computing operations. For example, the control module (130) can control the lighting control device (100) by reading a computer program. The signal control module (120) for performing such data processing may include a central processing unit (CPU), a general purpose graphics processing unit (GPGPU), a tensor processing unit (TPU), an application specific integrated circuit (ASIC), a microcontroller (MICOM), or a field programmable gate array (FPGA). Since the above-described type of signal control module (120) is merely one example, the type of signal control module (120) can be configured in various ways within a range understandable to those skilled in the art based on the contents of the present disclosure.

[0040] The power conversion module (130) may include a DC / DC converter and may operate in a constant voltage mode or a constant current mode. The power conversion module (130) can convert the input voltage to a voltage suitable for the lighting module (110). If a constant current is required for the LED included in the lighting module (110), the power conversion module (130) can supply a constant current to stably maintain the brightness of the LED.

[0041] The power supply module (140) may include a Switched Mode Power Supply (SMPS) and can adjust the input voltage to a desired DC output voltage by switching the input voltage at a high frequency. The power supply module (140) may operate in a constant voltage mode or a constant current mode.

[0042]

[0043] FIG. 2 is a block diagram illustrating a signal control module included in a lighting control device according to one embodiment of the present invention.

[0044] Referring to FIG. 2, the signal control module (120) may include a signal selection unit (125) and a plurality of sub-signal generation units (124_1, 124_2, ...).

[0045] The first sub-signal generation unit (124_1) may include a duty control circuit (121_1), a frequency control circuit (122_1), and a PWM generation circuit (123_1).

[0046] Multiple sub-signal generation units may have the same structure as the first sub-signal generation unit (124_1) and each may generate a PWM signal with a different duty cycle or frequency. The signal selection unit (125) may generate a variable PWM signal by sequentially selecting PWM signals generated from multiple sub-signal generation units or by combining them in various forms. The signal control module (120) may output a variable PWM signal while continuously changing the duty cycle or frequency. The variable PWM signal may be in the form where PWM signals generated from multiple sub-signal generation units are output sequentially or combined in various forms. The lighting control device may control a lighting module (not shown) based on the variable PWM signal generated by the signal control module (120).

[0047]

[0048] FIG. 3 is a circuit diagram illustrating a sub-signal generation unit according to one embodiment of the present invention.

[0049] Referring to FIG. 3, the sub-signal generation unit (200) may include a duty control circuit (210), a frequency control circuit (220), and a PWM generation circuit (230).

[0050] The duty control circuit (210) may include a variable resistor (VR1), a first diode (D1), and a second diode (D2). The variable resistor (VR1) may be connected to a frequency control circuit (220). The duty control circuit (210) may include a first diode (D1) for charging connected to the variable resistor (VR1) so that current flows from the supply voltage (VCC) through the variable resistor (VR1) to the frequency control circuit (220), and a second diode (D2) for discharging connected to the variable resistor (VR1) so that current flows from the frequency control circuit (220) toward the variable resistor (VR1) to discharge. When the resistance value of the variable resistor (VR1) increases, the duty ratio of the PWM signal output from the PWM generation circuit (230) decreases, and when the resistance value of the variable resistor (VR1) decreases, the duty ratio of the PWM signal may increase.

[0051] The frequency control circuit (220) may include a plurality of capacitors (e.g., C3 to C7) and a plurality of switches (e.g., SW1 to SW4) for controlling the capacitance of the frequency control circuit (220) by selectively connecting the plurality of capacitors in parallel. For example, when all switches are in the off state, the basic capacitance of the frequency control circuit (220) may be the size of the third capacitor (C3). In each of the plurality of sub-signal generation units, the size of the third capacitor (C3) or the basic capacitor corresponding to the third capacitor (C3) may all be set differently. The sizes of the fourth capacitor (C4) to the seventh capacitor (C7) of the frequency control circuit (220) may be the same or different. The frequency control circuit (220) may be set to various capacitances by combinations of the on-off states of the plurality of switches (SW1 to SW4). The PWM generation circuit (230) can generate a PWM signal having a frequency corresponding to the capacitance of the frequency control circuit (220). If the capacitance of the frequency control circuit (220) increases, the frequency of the PWM signal decreases, and if the capacitance of the frequency control circuit (220) decreases, the frequency of the PWM signal can increase.

[0052] The PWM generating circuit (230) can output a high-level signal while the capacitor of the frequency control circuit (220) is being charged through the first diode (D1), and output a low-level signal while the capacitor of the frequency control circuit (220) is being discharged through the second diode (D2). The PWM generating circuit (230) can control whether the frequency control circuit (220) is being charged or discharged by comparing the voltage (V1) applied to the frequency control circuit (220) or the capacitors (C3 to C7) of the frequency control circuit (220) with the supply voltage (VCC).

[0053] For example, the PWM generation circuit (230) can control the supply voltage (VCC) to charge the capacitor of the frequency control circuit (220) through the first resistor (R1), the first diode (D1), and the variable resistor (VR1). The PWM generation circuit (230) can output a high-level signal as a PWM signal during charging. The PWM generation circuit (230) can control the capacitor of the frequency control circuit (220) to be discharged by resetting the flip-flop in the oscillator (240) and changing the discharge pin (DSCHG, 7) of the oscillator (240) to a low level when the magnitude of the applied voltage (V1) exceeds a preset magnitude.

[0054] The PWM generation circuit (230) can output a low-level signal as a PWM signal during the discharge process. When the magnitude of the applied voltage (V1) becomes less than or equal to a preset magnitude, the PWM generation circuit (230) can reset the flip-flop in the oscillator (240) and return to a charging mode that outputs a high-level signal as a PWM signal. The PWM generation circuit (230) or the oscillator (240) may include a comparator for determining the magnitude of the applied voltage (V1).

[0055] When the duty cycle of a PWM signal is set using a variable resistor (VR1) and the on-off state of a plurality of switches (SW1 to SW4) is changed, the duty cycle is fixed even if the frequency of the PWM signal changes, thereby preventing momentary flickering of the light. The brightness of the light can be controlled by adjusting the duty cycle through the variable resistor (VR1).

[0056] For example, the size of the first resistor (R1) may be 1k, the size of the third capacitor (C3) may be 10nF, the size of the fourth capacitor (C4) may be 22nF, the size of the fifth capacitor (C5) may be 22nF, the size of the sixth capacitor (C6) may be 22nF, and the size of the seventh capacitor (C7) may be 47nF. If the capacitor size (capacitance) of the frequency control circuit (220) is 100nF, a PWM signal having a frequency of approximately 110Hz may be output.

[0057] The variable resistor (VR1) or the plurality of switches (SW1 to SW4) may be physically operable by the user. For example, the plurality of switches (SW1 to SW4) may be mechanical switches. In this case, the user can use various combinations of the frequency and duty cycle of the PWM signal without a separate processor for control.

[0058]

[0059] FIG. 4 is a circuit diagram illustrating a sub-signal generation unit according to an embodiment of the present invention.

[0060] Referring to FIG. 4, the sub-signal generation unit (300) may include a frequency control circuit (320_1). The sub-signal generation unit (300) may include a duty control circuit and a PWM generation circuit, and the duty control circuit and the PWM generation circuit are identical to the duty control circuit (210) and the PWM generation circuit (230) included in the sub-signal generation unit (200) of FIG. 3.

[0061] The frequency control circuit (320_1) may include a plurality of capacitors (e.g., C3 to C7) and a plurality of switching elements (e.g., Q1FET to Q4FET) for controlling the capacitance of the frequency control circuit (320_1) by selectively connecting the plurality of capacitors in parallel. For example, when all switches are in the off state, the basic capacitance of the frequency control circuit (320_1) may be the size of the third capacitor (C3). In each of the plurality of sub-signal generation units, the size of the third capacitor (C3) or the basic capacitor corresponding to the third capacitor (C3) may all be set differently. The sizes of the fourth capacitor (C4) to the seventh capacitor (C7) of the frequency control circuit (320_1) may be the same or different. The frequency control circuit (220) can be set to various capacitances by combinations of the on-off states of a plurality of switching elements (e.g., Q1FET to Q4FET). The frequency control circuit (320_1) may include a microcomputer (310) for controlling a plurality of switching elements (Q1FET to Q4FET). In this case, the frequency control circuit (320_1) can quickly turn the plurality of switching elements on and off in various combinations using the microcomputer (310).

[0062] When a single frequency corresponding to the third capacitor (C3) is set in the frequency control circuit (320_1) and the lighting is controlled, shadows may occur in the captured photograph. When the fourth capacitor (C4) to the seventh capacitor (C7) are selectively connected by controlling a plurality of switching elements (Q1FET to Q4FET) in the frequency control circuit (320_1), the frequency decreases depending on the connected capacitor, and the shadows in the captured photograph become larger and the quality may decrease.

[0063]

[0064] FIG. 5 is a circuit diagram illustrating a lighting control device according to one embodiment of the present invention.

[0065] Referring to FIG. 5, the lighting control device (400) may include a first sub-signal generating unit (410), a second sub-signal generating unit (410_2), a third sub-signal generating unit (410_3), a fourth sub-signal generating unit (410_4), and a signal selection unit (430).

[0066] The first sub-signal generation unit (410) may have a structure corresponding to the sub-signal generation unit (200) described in FIG. 3 and may include the circuit structure of the sub-signal generation unit (200). In FIG. 5, the frequency control circuit of the first sub-signal generation unit (410) is represented as a first capacitor (C1), but it may be replaced with the frequency control circuit (220) structure of FIG. 3.

[0067] The first capacitor (C1) to the fourth capacitor (C4) included in each of the first sub-signal generation unit (410) to the fourth sub-signal generation unit (410_4) may be set to different capacities. For example, the first capacitor (C1) may be set to 10 pF, the second capacitor (C2) to 22 pF, the third capacitor (C3) to 33 pF, and the fourth capacitor (C4) to 47 pF. The first sub-signal generation unit (410) to the fourth sub-signal generation unit (410_4) may each output PWM signals of different frequencies due to different basic capacitances. The first sub-signal generation unit (410) to the fourth sub-signal generation unit (410_4) may each include a first AND gate (414) to a fourth AND gate (414_4) to select an output signal.

[0068] The signal selection unit (430) can sequentially select PWM signals generated from a plurality of sub-signal generation units or combine them in various forms. The signal selection unit (430) may include a sequential controller (432) and a clock generator (434).

[0069] The clock generator (434) may include a third resistor (R3), a fourth resistor (R4), and a twelfth capacitor (C12). The clock generator (434) may output a high-level signal while the twelfth capacitor (C12) is charged through the third resistor (R3) and the fourth resistor (R4), and output a low-level signal while it is discharged.

[0070] The sequential controller (432) can sequentially output a first signal (Q0) to a tenth signal (Q9) based on the clock generated by the clock generator (434). While the first signal (Q0) is maintained at a high level, a PWM signal output from the first sub-signal generation unit (410) can be output through the first AND gate (414). While the second signal (Q1) is maintained at a high level, a PWM signal output from the second sub-signal generation unit (410_2) can be output through the second AND gate (414_2). When the fifth signal (Q4) switches to a high level, the sequential controller (432) is reset and can output high-level signals again starting from the first signal (Q0).

[0071] Although FIG. 5 describes a case where PWM signals are output sequentially based on four sub-signal generation units, the number of sub-signal generation units and the output order and combination of PWM signals are not limited to this and can be implemented in various forms. For example, when the fifth signal (Q4) is switched to a high level, an OR gate may be additionally used to combine and output the PWM signals of the first sub-signal generation unit (410) and the second sub-signal generation unit (410_2). The variable PWM signal output from the lighting control device may refer to a state in which PWM signals are combined and output to control the lighting module.

[0072]

[0073] FIG. 6 is a block diagram illustrating a lighting control device according to one embodiment of the present invention.

[0074] Referring to FIG. 6, the lighting control device (500) may include a signal selection circuit (530), a power circuit (550), a first sub-signal generation unit (510) to a fourth sub-signal generation unit (510_4), and a first lighting unit (560) to a fourth lighting unit (560_4). A power conversion module may be further included between each sub-signal generation unit and the lighting unit.

[0075] The first lighting unit (560) may include a red LED, the second lighting unit (560_2) may include a blue LED, and the third lighting unit (560_3) may include a green LED. The fourth lighting unit (560_4) may include a white LED.

[0076] The signal selection unit (530) may be the same circuit as the signal selection unit (430) described in FIG. 5. In FIG. 6, the lighting control device (500) may have a first sub-signal generation unit (510) to a fourth sub-signal generation unit (510_4) that can transmit PWM signals to the first lighting unit (560) to the fourth lighting unit (560_4), respectively. In this case, the variable PWM signal generated by the lighting control device (500) may be a concept that includes all PWM signals generated by each of the sub-signal generation units.

[0077] For example, if the switching speed of the first lighting unit (560) to the fourth lighting unit (560_4) in the lighting control device (500) is very fast (60Hz or higher), the switching of RGB or RGBW LED lighting is not perceived by the human eye and may be perceived as white or single-color lighting. The lighting control device (500) can control the frequency, duty cycle, or operation order of each lighting unit so that the average light amount per unit control section of the first lighting unit (560) to the fourth lighting unit (560_4) maintains a preset light amount value. The lighting control device (500) can control the frequency, duty cycle, or operation order of each lighting unit so that the RGB color combination per unit control section of the first lighting unit (560) to the fourth lighting unit (560_4) maintains a preset RGB value.

[0078] Since the camera recognizes an environment including illumination at a specific point in time, if the frequency, duty cycle, and RGB color combination are continuously changed in the first lighting unit (560) to the fourth lighting unit (560_4), the quality of the captured photo may be further degraded.

[0079] The various embodiments of the present invention described above may be combined with additional embodiments and modified within the scope understandable to those skilled in the art in light of the detailed description above. The embodiments of the present invention are illustrative in all respects and should be understood as not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form. Accordingly, all modifications or variations derived from the meaning, scope, and equivalents of the claims of the present invention should be interpreted as being included within the scope of the present invention.

Claims

1. In an intelligent security lighting control device, A signal control module that outputs a variable PWM (Pulse Width Modulation) signal for LED lighting control; and A lighting module that operates according to the above variable PWM signal; comprising, The above signal control module includes a plurality of sub-signal generation units and signal selection units, and The above plurality of sub-signal generation units each generate PWM signals with different frequencies or duty ratios, and The signal selection unit is characterized by generating the variable PWM signal based on the PWM signal generated by the plurality of sub-signal generation units. Intelligent security lighting control device.

2. In Paragraph 1, The above sub-signal generation unit includes a frequency control circuit, and The frequency control circuit comprises a plurality of capacitors and a plurality of switches connected to each of the plurality of capacitors to selectively connect the plurality of capacitors in parallel to control the capacitance of the frequency control circuit. Characterized that when the capacitance of the frequency control circuit increases, the frequency of the PWM signal decreases, and when the capacitance of the frequency control circuit decreases, the frequency of the PWM signal increases. Intelligent security lighting control device.

3. In Paragraph 2, The above sub-signal generation unit includes a duty control circuit, and The duty control circuit comprises a variable resistor connected to the frequency control circuit, a first charging diode connected to the variable resistor to allow current to flow from the supply voltage through the variable resistor to the frequency control circuit, and a second discharging diode connected to the variable resistor to allow current to flow from the frequency control circuit toward the variable resistor to discharge. When the resistance value of the above variable resistor increases, the duty cycle of the above PWM signal decreases, and Characterized that the duty ratio of the PWM signal increases when the resistance value of the variable resistor decreases. Intelligent security lighting control device.

4. In Paragraph 3, The above sub-signal generation unit includes a PWM generation circuit, and The above PWM generating circuit is characterized by outputting a high-level signal while the capacitor of the frequency control circuit is being charged through the first diode, outputting a low-level signal while the capacitor of the frequency control circuit is being discharged through the second diode, and controlling whether the frequency control circuit is being charged or discharged by comparing the voltage applied to the frequency control circuit with the supply voltage. Intelligent security lighting control device.

5. In Paragraph 1, The above signal selection unit is characterized by sequentially selecting and outputting the plurality of sub-signal generation units at a preset period. Intelligent security lighting control device.

6. In Paragraph 2, The plurality of switches are characterized by including MOSFET switching elements controlled by a microcontroller. Intelligent security lighting control device.

7. In Paragraph 1, The above lighting module includes one or more of a red LED unit, a blue LED unit, a green LED unit, or a white LED unit, and The plurality of sub-signal generating units are characterized by including a first sub-signal generating unit that controls the red LED unit, a second sub-signal generating unit that controls the blue LED unit, a third sub-signal generating unit that controls the green LED unit, and a fourth sub-signal generating unit that controls the white LED unit. Intelligent security lighting control device.

8. In Paragraph 7, The above plurality of sub-signal generation units output PWM signals of different frequencies or duty ratios, and The signal selection unit is characterized by controlling the lighting module by sequentially selecting the plurality of sub-signal generation units or selecting and combining two or more of them. Intelligent security lighting control device.

9. In Paragraph 8, The signal selection unit is characterized by including an AND gate for PWM signal selection, a diode connected to a PWM signal output terminal, and a pull-down resistor for each of the plurality of sub-signal generation units. Intelligent security lighting control device.

10. In Paragraph 9, The above PWM signal is characterized by varying the frequency or duty ratio while maintaining the average light amount per unit control interval of the lighting module at a preset light amount value. Intelligent security lighting control device.

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