Intelligent light-sensing control circuit and controller

Abstract

The utility model provides an intelligent light sense control circuit and controller relates to lighting control technical field, this intelligent light sense control circuit includes: power module, power module has for connecting high voltage DC power supply's high voltage input and is used for output low voltage DC's low voltage output, light sense detection module, light sense detection module's power end is connected with power module's low voltage output, light sense detection module is used for detecting ambient light intensity and exports light sense signal, main control unit, main control unit's power end is connected with power module's low voltage output, and main control unit's signal input is connected with light sense detection module's output, is used for generating control signal according to light sense signal, power switch module, power switch module's control end is connected with main control unit's control signal output, and power switch module's main current passageway is used for being connected in series in the lighting lamps and lanterns loop of waiting for controlling.

Description

Technical Field

[0001] This utility model relates to the field of lighting control technology, specifically to an intelligent light-sensing control circuit and controller. Background Technology

[0002] In public places such as corridors, courtyards, and parking lots, ordinary lighting fixtures are widely used as basic lighting facilities. Their switching control mostly relies on manual operation or time controllers with fixed timing. Manual control is significantly affected by human factors, and often the lights are not switched on or off in time due to negligence, resulting in the lights remaining on for a long time even when there is sufficient light during the day, causing energy waste. On the other hand, time controllers can only operate according to preset programs and cannot dynamically respond to fluctuations in ambient illuminance caused by weather conditions, seasonal changes, etc. The matching degree between lighting time and actual environmental needs is low, which not only affects the lighting effect but also exacerbates the energy consumption problem.

[0003] Although some smart lighting fixtures with integrated light sensing functions have appeared on the market, most of them adopt an integrated design, with the light sensing control module and the lamp body inseparable. This makes it difficult to directly adapt to existing ordinary lighting fixtures, resulting in the need to replace the entire lamp for intelligent upgrades in the existing market. This leads to high retrofit costs and complex operations, greatly limiting the application and promotion of intelligent light sensing control in existing lighting systems. In addition, existing light sensing control technologies have shortcomings in the universality of circuit design. Some solutions require a separate low-voltage power adapter for the light sensing detection and control unit, increasing additional wiring and costs. Other solutions rely on specific types of driver power supply designs for circuit topologies, limiting compatibility and making it impossible to flexibly adapt to ordinary lighting fixtures with different power supply characteristics. Such designs not only raise the threshold for retrofitting but also further hinder the popularization of intelligent light sensing control due to the need to match dedicated power supplies or adjust wiring. Utility Model Content

[0004] In view of the above problems, in a first aspect, the present invention provides an intelligent light-sensing control circuit, the intelligent light-sensing control circuit comprising: a power supply module, the power supply module having a high-voltage input terminal for connecting to a high-voltage DC power supply and a low-voltage output terminal for outputting low-voltage DC power;

[0005] A light-sensing detection module, wherein the power supply terminal of the light-sensing detection module is connected to the low-voltage output terminal of the power supply module, and the light-sensing detection module is used to detect ambient light intensity and output a light-sensing signal;

[0006] The main control unit has its power supply terminal connected to the low-voltage output terminal of the power supply module, and its signal input terminal connected to the output terminal of the light sensing module, for generating control signals based on the light sensing signal.

[0007] A power switch module, wherein the control terminal of the power switch module is connected to the control signal output terminal of the main control unit, and the main current path of the power switch module is used to be connected in series in the lighting circuit to be controlled.

[0008] In one possible implementation, the power supply module includes a step-down unit and a voltage regulator unit connected in sequence; wherein the step-down unit is a switching step-down circuit based on a switching power supply control chip, and the voltage regulator unit is a low-dropout linear regulator.

[0009] In one possible implementation, the operating voltage range of the switching power supply control chip covers 36V to 150V; the output voltage of the low dropout linear regulator is 5V.

[0010] In one possible implementation, the light-sensing detection module includes a photosensitive element and an adjustable resistor connected in series with the photosensitive element, the adjustable resistor being used to set a light-sensing trigger threshold.

[0011] In one possible implementation, the main control unit is a microcontroller with a built-in analog-to-digital converter, and the signal input terminal is the ADC sampling pin of the microcontroller.

[0012] In one possible implementation, the core switching element of the power switching module is an N-channel enhancement-mode MOSFET, with the gate of the MOSFET serving as the control terminal and the source and drain serving as the two ends of the main current path.

[0013] In one possible implementation, the turn-on threshold voltage of the MOSFET is in the range of 1V to 2.5V.

[0014] In one possible implementation, the light-sensing module includes photosensitive elements that have different spectral response characteristics to sunlight and LED lighting light.

[0015] In one possible implementation, the intelligent light-sensing control circuit further includes a local filtering circuit, which is electrically connected to the input and output terminals of the low-dropout linear regulator.

[0016] Secondly, embodiments of the present invention provide an intelligent light sensor controller, including an intelligent light sensor control circuit as described in any of the above possible implementations.

[0017] The above-described one or more technical solutions in the embodiments of this utility model have at least one or more of the following technical effects:

[0018] The intelligent light-sensing control circuit provided in this embodiment of the invention directly draws power from the unprocessed high-voltage DC power supply of the lamp and converts it into stable low-voltage DC power to provide integrated power for the light-sensing detection module and the main control unit. This eliminates the need for an external low-voltage adapter, significantly simplifying the wiring structure and reducing modification costs and installation complexity. The light-sensing detection module senses the ambient light intensity in real time and outputs a light-sensing signal. The main control unit intelligently analyzes this signal and generates a control signal to drive the power switch module to turn on and off, thereby achieving automatic control of the lamp circuit. This avoids the energy waste caused by manual operation and solves the problem of time controllers being unable to dynamically control the light. This design addresses the issue of low lighting matching due to changes in ambient light. Furthermore, the entire circuit employs an independent external design, separating the light sensor control function from the luminaire itself. This allows for direct adaptation to existing general lighting systems without replacing the original luminaire, significantly improving ease of use in the existing market and lowering the barrier to intelligent upgrades. In addition, the power switch module is directly connected in series in the luminaire circuit, and the power supply module is compatible with a wide range of high-voltage DC inputs, enabling flexible adaptation to various luminaires with different power supply characteristics. This enhances the circuit's versatility and practicality, ultimately achieving the dual goals of energy saving and widespread adoption while ensuring precise, on-demand lighting and optimizing user experience.

[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0020] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the modular composition structure of the intelligent light-sensing control circuit in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the intelligent light-sensing control circuit in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached diagram: 100, power supply module; 200, light sensor module; 300, main control unit; 400, power switch module. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0026] The overall concept of the technical solution provided by this utility model is as follows:

[0027] Please see Figure 1 The intelligent light-sensing control circuit includes:

[0028] The power supply module 100 has a high-voltage input terminal for connecting to a high-voltage DC power supply and a low-voltage output terminal for outputting low-voltage DC power; the high-voltage input terminal is used to connect to an externally provided high-voltage DC power supply, which is typically derived from the output terminal of the driving power supply of the lighting fixture to be controlled.

[0029] The power supply module 100 is configured to convert the high-voltage DC power received from the high-voltage input terminal into a stable low-voltage DC power and output it from the low-voltage output terminal. The low-voltage output terminal is connected to the power supply terminal of the light-sensing module 200 and the power supply terminal of the main control unit 300, respectively, to provide the required operating voltage for the light-sensing module 200 and the main control unit 300.

[0030] There are various ways to implement the power supply module 100. For example, it may include a voltage conversion circuit, which may be implemented using linear regulation or switching regulation methods well known to those skilled in the art, to convert high-voltage DC input into low-voltage DC output. Its purpose is to provide a stable and reliable low-voltage power supply for subsequent circuits, while having a certain input voltage adaptation range to be compatible with different types of lamp driver power supplies.

[0031] In this way, the power supply module 100 can directly draw power from the original power supply of the lamp and supply power to the intelligent control circuit, without the need for an external low-voltage power adapter.

[0032] A light-sensing detection module 200 is provided, with its power supply terminal connected to the low-voltage output terminal of the power supply module 100. The light-sensing detection module 200 is used to detect ambient light intensity and output a light-sensing signal. The power supply terminal of the light-sensing detection module 200 is connected to the low-voltage output terminal of the power supply module 100 to obtain working power. The light-sensing detection module 200 is used to detect ambient light intensity in real time and output a light-sensing signal representing the current ambient light intensity to the main control unit 300.

[0033] The light-sensing signal can be an analog voltage signal or a digital signal formed after analog-to-digital conversion. When an analog signal is output, the main control unit 300 receives the signal and converts it into a digital value for processing. When the light-sensing detection module 200 has an integrated analog-to-digital conversion function, it can directly output a digital signal to the main control unit 300.

[0034] The main control unit 300 has its power supply terminal connected to the low-voltage output terminal of the power supply module 100, and its signal input terminal connected to the output terminal of the light sensing module 200, for generating control signals based on light sensing signals; the main control unit 300's power supply terminal is connected to the low-voltage output terminal of the power supply module 100 to obtain operating power; the main control unit 300's signal input terminal is connected to the output terminal of the light sensing module 200 to receive light sensing signals.

[0035] The main control unit 300 is configured to make judgments based on the received light sensing signals according to preset logic, and generate corresponding control signals at its control signal output terminal accordingly.

[0036] The main control unit 300 can be implemented by a microcontroller (MCU), application-specific integrated circuit or programmable logic device, etc. It may contain a processor core, memory and input / output interface. The preset logic can be stored in its memory in the form of software program or firmware and executed by the processor core.

[0037] The main control unit 300 compares the read light intensity value with one or more internally preset thresholds. For example, when the light intensity value is lower than the first preset threshold, it determines that the ambient light is insufficient and the lights need to be turned on. At this time, the main control unit 300 sets the level of its control signal output terminal to an active state. When the light intensity value is higher than the second preset threshold, it determines that the ambient light is sufficient and the lights need to be turned off. At this time, the level of its control signal output terminal is set to an inactive state. The first threshold and the second threshold can be set to the same value to produce instant switching, or they can be set to different values ​​to introduce hysteresis comparison and prevent frequent switching near the critical point.

[0038] A power switch module 400 is included, with its control terminal connected to the control signal output terminal of the main control unit 300. The main current path of the power switch module 400 is connected in series in the lighting fixture circuit to be controlled. The power switch module 400 is configured to control the conduction and cutoff of its main current path based on the level of the control signal received at its control terminal, thereby achieving automatic control of the lighting fixture's on / off state. The power switch module 400 converts the low-voltage control signal from the main control unit 300 into on / off control of the lighting fixture's high-voltage circuit, ultimately completing the final execution action of the intelligent light-sensing control.

[0039] By utilizing the power supply module 100 to directly draw power from the unprocessed high-voltage DC power supply of the lighting fixtures and convert it into stable low-voltage DC power, the light sensor module 200 and the main control unit 300 are powered as a single unit. This eliminates the need for an external low-voltage adapter, significantly simplifying the wiring structure and reducing modification costs and installation complexity. The light sensor module 200 senses the ambient light intensity in real time and outputs a light sensor signal. The main control unit 300 intelligently analyzes this signal and generates a control signal to drive the power switch module 400 to switch on and off, thereby achieving automatic control of the lighting fixture circuit. This avoids the energy waste caused by manual operation and solves the problem of time controllers being unable to dynamically respond to ambient light. The circuit addresses the issue of low lighting compatibility caused by changes in lighting conditions. Simultaneously, the entire circuit employs an independent external design, separating the light sensor control function from the luminaire itself. This allows for direct adaptation to existing general lighting systems without replacing the original luminaire, significantly improving ease of use in the existing market and lowering the barrier to intelligent upgrades. Furthermore, the power switch module 400 is directly connected in series in the luminaire circuit, and the power supply module 100 is compatible with a wide range of high-voltage DC inputs, enabling flexible adaptation to various luminaires with different power supply characteristics. This enhances the circuit's versatility and practicality, ultimately achieving the dual goals of energy saving and widespread adoption while ensuring precise, on-demand lighting and optimizing user experience.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. 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.

[0041] Please see Figure 2 The power supply module 100 includes a step-down unit and a voltage regulator unit connected in sequence; wherein, the step-down unit is a switching step-down circuit based on the switching power supply control chip U1, and the voltage regulator unit is a low dropout linear regulator U2.

[0042] In one embodiment, the operating voltage range of the switching power supply control chip covers 36V to 150V; the output voltage of the low dropout linear regulator is 5V; the high voltage input terminal of the power supply module 100 can be connected via a 2.5mm interface; the buck unit is a switching buck circuit based on the switching power supply control chip U1, which is configured to accept a wide voltage input, with an operating voltage range covering 36V to 150V, to significantly reduce the high voltage input to an intermediate voltage; the switching power supply control chip U1 can be an integrated circuit such as DP3001 or GR8903; the chip U1, together with its peripheral circuitry, including a freewheeling diode D1, an energy storage inductor L1, an input filter capacitor C3, and a configuration resistor R1, works together to convert a wide range of input voltages from 36V to 150V to a fixed lower voltage, such as 12V or 5V.

[0043] The voltage regulator unit is connected to the output of the buck unit to precisely regulate and filter the stepped-down voltage, providing a highly stable low-voltage DC power supply. The voltage regulator unit is preferably implemented using a low-dropout linear regulator U2. The low-dropout linear regulator U2 can be a chip such as the SC7550, and its voltage rating must be higher than the output voltage of the buck unit, for example, 30V. The low-dropout linear regulator U2 stabilizes its input voltage at a precise 5V and outputs it from its low-voltage output terminal.

[0044] In an exemplary embodiment, the intelligent light-sensing control circuit further includes a local filtering circuit, which is electrically connected to the input and output terminals of the low-dropout linear regulator.

[0045] Specifically, please refer to Figure 2 The local filtering circuit includes input filter capacitors and output filter capacitors. For example, input filter capacitors C1 and C2 are connected in parallel between the input terminal of the low-dropout linear regulator U2 and the reference ground to filter out voltage ripple from the preceding buck unit; output filter capacitors C5 and C6 are connected in parallel between the output terminal of the low-dropout linear regulator U2 and the reference ground to further suppress output noise and ensure the purity and stability of the final output voltage.

[0046] In the exemplary embodiments, please refer to Figure 2 The light sensing module 200 includes a photosensitive element U5 and an adjustable resistor R9 connected in series with the photosensitive element. The adjustable resistor R9 is used to set the light sensing trigger threshold. The photosensitive element U5 is preferably a photoresistor or a photodiode. The photosensitive element U5 and the adjustable resistor R9 are connected in series between the power supply and the reference ground to form a voltage divider circuit. The photosensitive element U5 outputs a light sensing signal to the signal input terminal of the main control unit 300.

[0047] By adjusting the resistance value of the adjustable resistor R9, the voltage division ratio can be changed, thereby setting the light intensity threshold required to trigger the change of the state of the main control unit 300300, i.e., the light-sensing trigger threshold.

[0048] To further improve the circuit's anti-interference performance and prevent signal jitter caused by rapid and minute changes in ambient light or noise, a filter capacitor C7 can be connected in parallel across the adjustable resistor R9. This capacitor C7 smooths the voltage signal, making the output light sensing signal more stable, thereby improving the accuracy and reliability of control.

[0049] In the exemplary embodiments, please refer to Figure 2 The main control unit 300 is a microcontroller U3 with a built-in analog-to-digital converter, and the signal input terminal is the ADC sampling pin of the microcontroller U3. The microcontroller U3 is the control core of the circuit, preferably a PIC series microcontroller, responsible for performing logic operations, signal processing and generating control instructions.

[0050] The microcontroller U3 has a built-in analog-to-digital converter. One of its ADC sampling pins serves as the signal input terminal of the main control unit 300 and is connected to the signal output terminal of the light sensing module 200 to receive and digitize the light-sensing analog voltage signal.

[0051] One of the general-purpose input / output pins of the microcontroller U3 serves as the control signal output terminal of the main control unit 300, and is connected to the control terminal of the power switch module 400 to output control signals to drive its on / off state.

[0052] The microcontroller U3 is pre-configured with a control program. Its workflow includes: periodically reading the digital value corresponding to the ambient light intensity through the ADC sampling pin; comparing this value with a preset threshold stored internally; and outputting a corresponding level signal through the CTR pin based on the comparison result, ultimately realizing intelligent light control of the lamps.

[0053] In an exemplary embodiment, the core switching element of the power switching module 400 is an N-channel enhancement-mode MOSFET Q1. The gate of MOSFET Q1 serves as the control terminal, while its source and drain serve as the two ends of the main current path. The gate of MOSFET Q2 serves as the final control node of the power switching module 400, and its source and drain serve as the two ends of the main current path, connected in series to the LED power supply circuit. The turn-on threshold voltage range of MOSFET Q1 is 1V to 2.5V, ensuring that it can be effectively driven by the standard logic level output by the main control unit 300.

[0054] More specifically, the gate of the MOSFET Q1 is connected to the control signal output terminal of the main control unit 300 through a gate current-limiting resistor R3, and this gate serves as the control terminal of the power switch module 400. The drain and source of the MOSFET Q1 are connected in series in the power supply circuit of the LED lighting fixture, forming the two ends of the main current path. When the control signal output by the main control unit 300 is high, the MOSFET Q1 is turned on, the lighting circuit is connected, and the lamp is lit; when the control signal is low, Q1 is turned off, the lighting circuit is disconnected, and the lamp is turned off.

[0055] To improve the stability and reliability of the circuit, a gate pull-down resistor R6 is connected in parallel between the gate and source of the MOSFET Q1. This resistor R6 ensures that the gate potential of Q1 is reliably pulled low when the main control unit 300 is initialized or in a high-impedance state, preventing it from being mistakenly turned on due to interference signals. In addition, an LED current-limiting resistor R5 is connected in series in the main current path to limit the maximum current flowing through the lamp, providing overcurrent protection.

[0056] Preferably, the power switch module 400 is also connected to an external lighting load via a connector J2 for easy installation and maintenance.

[0057] Preferably, the light sensing module 200 includes a photosensitive element U5 with different spectral response characteristics to sunlight and LED illumination light. The photosensitive element U5 can be selected as an optoelectronic device whose spectral response curve has high sensitivity near the peak wavelength of sunlight, for example, the blue-green light region of about 450-550 nm, while its sensitivity is relatively low near the main emission wavelength of common white LEDs, for example, the yellow light region of about 600-650 nm.

[0058] For example, the photosensitive element U5 can be a photodiode or photoresistor that is more sensitive to short-wavelength light. Specifically, a silicon blue enhanced photodiode or a photoresistor with similar spectral selectivity can be selected. Those skilled in the art can easily select a photosensitive element whose spectral response characteristics meet the above requirements by consulting the component datasheet.

[0059] By employing photosensitive elements with differentiated spectral responses to sunlight and LED lighting, the light sensing module 200 can more accurately distinguish between natural light and artificial light generated by other surrounding LED lights. This feature effectively prevents the lights controlled by this invention from mistakenly remaining off due to sensing sufficient light intensity in existing artificial lighting environments. This ensures control accuracy in scenarios such as corridors and underground parking lots where there are both natural light entrances and other fixed lighting, further enhancing user experience and energy-saving effects.

[0060] This utility model embodiment also provides an intelligent light sensor controller, including an intelligent light sensor control circuit as described in the foregoing embodiments. Various variations and specific embodiments in the foregoing embodiments are also applicable to the intelligent light sensor controller of this embodiment. Through the foregoing detailed description of an intelligent light sensor control circuit, those skilled in the art can clearly understand the implementation method of the intelligent light sensor controller in this embodiment. For the sake of brevity, it will not be described in detail here.

[0061] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0062] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. An intelligent light-sensing control circuit, characterized in that, include: A power supply module having a high-voltage input terminal for connecting to a high-voltage DC power supply and a low-voltage output terminal for outputting low-voltage DC power; A light-sensing detection module, wherein the power supply terminal of the light-sensing detection module is connected to the low-voltage output terminal of the power supply module, and the light-sensing detection module is used to detect ambient light intensity and output a light-sensing signal; The main control unit has its power supply terminal connected to the low-voltage output terminal of the power supply module, and its signal input terminal connected to the output terminal of the light sensing module, for generating control signals based on the light sensing signal. A power switch module, wherein the control terminal of the power switch module is connected to the control signal output terminal of the main control unit, and the main current path of the power switch module is used to be connected in series in the lighting fixture circuit to be controlled; The power supply module includes a step-down unit and a voltage regulator unit connected in sequence; wherein, the step-down unit is a switching step-down circuit based on a switching power supply control chip, and the voltage regulator unit is a low dropout linear regulator; The operating voltage range of the switching power supply control chip covers 36V to 150V; the output voltage of the low dropout linear regulator is 5V. The photosensitive detection module includes a photosensitive element and an adjustable resistor connected in series with the photosensitive element. The adjustable resistor is used to set the photosensitive trigger threshold. The photosensitive element has different spectral response characteristics to sunlight and LED lighting light; The main control unit is a microcontroller with a built-in analog-to-digital converter, and the signal input terminal is the ADC sampling pin of the microcontroller; The core switching element of the power switching module is an N-channel enhancement-mode MOSFET, with the gate of the MOSFET serving as the control terminal and the source and drain serving as the two ends of the main current path. The turn-on threshold voltage range of the MOSFET is 1V to 2.5V.

2. The intelligent light-sensing control circuit according to claim 1, characterized in that, It also includes a local filter circuit, which is electrically connected to the input and output terminals of the low-dropout linear regulator.

3. An intelligent light sensor controller, characterized in that, Includes an intelligent light-sensing control circuit as described in claim 1 or 2.

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