A constant illumination control device, a lighting control method and a control system

Abstract

The present application provides a constant illumination control device, a lighting control method and a control system, which use a photodiode D2 to detect the light intensity of the environment before turning on the lighting lamp to obtain dimming data; adjust the lighting lamp to a corresponding brightness according to the dimming data; then use the photodiode D2 to detect the light intensity of the environment to obtain dimmed data; obtain fill light data according to the dimming data and the dimmed data; detect the ambient light intensity according to a set time interval and obtain patrol data; obtain new dimming data according to the patrol data and the fill light data, and then control the lighting lamp according to the new dimming data to achieve fill light for the ambient light to reach the set brightness value; this control mode is not affected by the installation and measurement position of the photodiode D2, and can be conveniently applied to various measurement structures and scene switching. As long as the measurement value of the photodiode D2 and the corresponding value of the control parameter of the lighting lamp are set, it can be applicable to various types of lighting fixtures.

Description

Technical Field

[0001] The present application relates to the field of lighting control, and in particular to a constant illumination control device, a lighting control method and a control system. Background Art

[0002] Lighting lamps are essential lighting tools in people's daily lives. Especially with the increasing popularity of intelligent control applications, the control of lighting lamps is gradually becoming automated and intelligent, and constant illumination control of lighting lamps is one of the important development areas.

[0003] The existing control scheme generally detects the real-time ambient illumination; if the difference between the real-time ambient illumination and the preset illumination is greater than the first threshold, the metering parameters used to calculate the dimming signal at the current moment are obtained; the dimming signal is generated based on the metering parameters; according to the dimming signal, the brightness of the lamp is adjusted to achieve intelligent control of the constant illumination of the lighting lamp. The control logic of the existing scheme requires that the photosensitive device must be installed within the range that the lighting lamp can illuminate, so that after adjusting the brightness, it can return to perform detection again and compare with the preset illumination to form a closed-loop control logic; if the photosensitive device is installed outside the illumination range, there will always be a difference between the real-time detection value and the preset illumination, resulting in an increasing deviation in the adjustment. At the same time, due to the different distances between the photosensitive device and the lighting lamp, the lighting intensity received by the lighting lamp is different, resulting in the preset illumination value also needing to be adjusted according to the specific location. When applying this scheme between lighting tools of different structures, repeated measurements and adjustments are required. The above shortcomings have led to certain limitations on the multi-scenario application of this technical solution.

[0004] At the same time, in the prior art, in order to reduce the impact of the photosensor detection data after turning on the light, the photosensor needs to be set at a specific position, such as the back or bottom of the lamp body. The position limitation will inevitably lead to inaccurate detection data in some occasions. Summary of the invention

[0005] In order to solve the above problems, the present application provides a constant illumination control device and a lighting control system, which realizes the intelligent control application of lighting lamps with different types of structures and installation methods.

[0006] In order to achieve the above purpose, the technical solution adopted by this application is as follows:

[0007] A constant illumination control device, the constant illumination control device comprising:

[0008] A collection unit, an adder, a subtractor, a dimming memory, a fill light memory, and a signal adjustment unit; the collection unit is used to collect the analog signal of the light intensity and convert it into a digital signal for output;

[0009] The adder is connected to the acquisition unit, the dimming memory and the fill light memory respectively, so as to add the detection data of the acquisition unit and the fill light data in the fill light memory to obtain the dimming data, and update the dimming data into the dimming memory;

[0010] The signal adjustment unit is connected to the dimming memory and is used to adjust the magnitude of the output signal according to the dimming data in the dimming memory to adjust the external lighting lamp to a corresponding brightness;

[0011] The subtractor is connected to the acquisition unit, the fill light memory and the dimming memory respectively, obtains dimmed data from the acquisition unit, and subtracts the dimmed data from the dimming data in the dimming memory to obtain the fill light data and then updates it into the fill light memory;

[0012] The constant illumination control device also includes a timer, a NOT gate U3, an AND gate U4 and an AND gate U5; the timer is provided with a first signal terminal and a second signal terminal; the first signal terminal is respectively connected to the input terminal of the NOT gate U3 and the first input terminal of the AND gate U5; the output terminal of the NOT gate U3 is connected to the first input terminal of the AND gate U4; the second signal terminal is respectively connected to the second input terminal of the AND gate U4 and the second input terminal of the AND gate U5; the output terminal of the AND gate U4 is connected to the subtractor; the output terminal of the AND gate U5 is connected to the adder; when the second signal terminal outputs a high level, the constant illumination control device enters a detection period During this period, the high level of the first signal end starts the adder to perform addition operation to obtain dimming data, and adjusts the brightness of the lighting lamp after updating it to the dimming memory; after the brightness adjustment of the lighting lamp is completed, the first signal end becomes a low level to turn off the adder, start the subtractor to perform subtraction operation to obtain fill light data, and update it to the fill light memory; the second signal end outputs a low level, the constant illumination control device enters the detection interval, and after the detection interval, the second signal end outputs a high level to make the constant illumination control device re-enter the detection period; the first signal end and the second signal end repeatedly output signals in a cycle to achieve constant illumination control of the lighting lamp.

[0013] Furthermore, the signal adjustment unit includes a DA converter and a signal adjustment circuit; the DA converter is coupled to the dimming memory to convert the dimming data in the dimming memory into an analog voltage signal output; the signal adjustment circuit is connected to the DA converter to adjust the output PWM signal duty cycle according to the voltage signal output by the DA converter, thereby adjusting the brightness of the lighting lamp.

[0014] Furthermore, the signal adjustment circuit includes a sawtooth wave generator, a comparator U10 and a resistor R101; the input end of the sawtooth wave generator is connected to the clock signal, and the output end is connected to the inverting input end of the comparator U10; the positive input end of the comparator U10 is connected to the DA converter with the input voltage signal as the reference voltage, and the output end is connected to the first end of the resistor R101; the second end of the resistor R101 serves as the PWM signal output end of the signal adjustment circuit.

[0015] Furthermore, the constant illumination control device also includes: a transistor U9 and a resistor R102; the timer is provided with a third signal terminal; the collector of the transistor U9 is connected to an external power supply, the emitter is connected to the power supply terminal of the acquisition unit, and the base is connected to the third signal terminal through the resistor R102; during the detection period, the timer outputs a high level to turn on the transistor U9 to power the acquisition unit for acquisition, and during the detection interval, the timer outputs a low level to turn off the transistor U9 to stop powering the acquisition unit to reduce energy consumption.

[0016] A lighting control method, the method is applied to the control device as described above, the method comprising the following steps:

[0017] S1: Control the photodiode to detect the light intensity of the environment before the light is turned on to obtain detection data, and add the detection data to the fill light data to obtain the dimming data;

[0018] S2: Adjust the lighting lamp to the corresponding brightness according to the dimming data;

[0019] S3: Control the photodiode to detect the light intensity of the environment at a preset first time interval to obtain dimming data;

[0020] S4: Obtain fill light data according to the dimming data and the post-dimming data;

[0021] S5: controlling the photodiode to detect the ambient light intensity at a preset second time interval and obtaining inspection data;

[0022] S6: Obtain new dimming data according to the inspection data and the fill light data, and return to step S2.

[0023] A lighting control system comprises: a power module, a photosensitive module, a driving module and the constant illumination control device as described above;

[0024] The power supply module is respectively connected to the photosensitive module, the constant illumination control device and the driving module to provide working power;

[0025] The acquisition unit of the constant illumination control device is connected to the photosensitive module to collect the sensing analog signal of the light intensity from the photosensitive module. After calculation, the signal adjustment unit outputs a signal to control the driving module to adjust the brightness of the lighting lamp.

[0026] Furthermore, the power supply end of the photosensitive module is connected to the emitter of the transistor U9, so that when the timer turns off the transistor U9 to stop supplying power to the collection unit, the power supply of the photosensitive module is also turned off, so as to further reduce energy consumption.

[0027] Furthermore, the photosensitive module includes a photosensitive diode D2, a capacitor C10, a capacitor C1 and a resistor R3; the anode of the photosensitive diode D2 is connected to the first end of the capacitor C1 and the first end of the capacitor C10 and then grounded; the cathode of the photosensitive diode D2 is connected to the second end of the capacitor C10 and the first end of the resistor R3, and then connected to the collection unit as the output end of the photosensitive module; the second end of the capacitor R3 is connected to the second end of the capacitor C1 and then connected to the emitter of the transistor U9.

[0028] Furthermore, the power module includes a rectifier circuit and a control power circuit; the rectifier circuit is connected to the control power circuit; the control power circuit includes resistor R2, resistor R6, resistor R8, resistor R13, resistor R10, resistor R14, resistor R3, resistor R4, a voltage regulator DZ1 and a capacitor EC3, wherein the resistor R2, resistor R6, resistor R8 and resistor R13 are connected in parallel, the resistor R10, resistor R14, resistor R3 and resistor R4 are connected in parallel, the voltage regulator DZ1 and capacitor EC3 are connected in parallel, and the three parallel circuits are connected in series and then grounded; the cathode of the voltage regulator DZ1 and the parallel point of the capacitor R3 are connected to the collector of the transistor U9 as the output end of the control power circuit, and the anode is grounded.

[0029] Furthermore, the power module also includes a driving power circuit; the driving power circuit includes a resistor R12, a resistor R11, a capacitor EC1, a capacitor EC4 and an inductor L8, wherein the resistor R12 and the resistor R11 are connected in series and then connected in parallel with the capacitor EC1 and the capacitor EC4, and the inductor L8 is connected in series between the capacitor EC1 and the capacitor EC4.

[0030] Furthermore, the driving module includes a processor U2, a diode D1, an inductor L6, a resistor R1, a capacitor EC2, and a common-mode inductor L4; the cathode of the diode D1 is connected to the first end of the resistor R1, the first end of the capacitor C2, and the first input end of the common-mode inductor L4, and then connected to the output end of the driving power supply circuit; the second input end of the common-mode inductor L4 is connected to the second end of the resistor R1, the second end of the capacitor C2, and the first end of the inductor L6; the second end of the inductor L6 is connected to the anode of the diode D1 and the processor U2; the two output ends of the common-mode inductor L4 are connected to the lighting lamp; the processor U2 is connected to the loop end of the driving power supply circuit through parallel resistors R7 and REC1; the processor U2 is connected to the signal adjustment unit through a resistor R15 to receive the adjusted output signal, and controls the on-off time ratio of the second end of the inductor L6 and the driving power supply circuit loop through an internal switch to control the equivalent voltage input to the lighting lamp and adjust the brightness of the lighting lamp.

[0031] The present application provides a constant illumination control device. When the photodiode D2 is installed outside the illumination range, if the detection value of the photodiode D2 is not affected by the light (the surrounding open environment), then the fill light data is 0, and the data collected by the collection unit each time is new dimming data, that is, each time the photodiode D2 only needs to measure the ambient light outside the illumination range, and adjust the intensity of the lighting lamp according to the intensity of the ambient light, so that the brightness of the lighting lamp plus the brightness of the ambient light can reach the set brightness value. When the photodiode D2 is installed outside the irradiation range, if the detection value of the photodiode D2 is still affected by the light (for example, the photodiode D2 will be affected by diffuse reflection when it is turned on in the house), the fill light data is obtained by two measurements before and after dimming the light. The fill light data can be regarded as the difference of the influence of the light of the lighting lamp on the light intensity of the measuring point; when inspecting at the set interval time, the detection data plus the difference can be obtained to obtain new dimming data, and the new dimming data can be regarded as the ambient light intensity value that the photodiode D2 should measure after turning off the light. Then, the lighting lamp is controlled according to this new dimming data to achieve the set brightness value by filling the ambient light; the same applies to any measurement point where the photodiode D2 is located within the irradiation range. It is only necessary to measure the fill light data of the influence of the light on the light intensity of the measuring point after dimming. When inspecting after each detection interval time, as long as the detection data and the fill light data are added, the ambient light intensity detection value (i.e., the new dimming data) when the lighting lamp is turned off can be obtained by calculation, and the light intensity is adjusted according to this value to stabilize the light intensity within the irradiation range at the set brightness value. At the same time, because the fill light data is obtained through measurement and calculation during each inspection, this feedback control mode is not affected by the installation and measurement position of the photodiode D2, and can be conveniently applied to various measurement structures and scene switching. As long as the measurement value of the photodiode D2 is set to the corresponding value of the control parameter of the lighting fixture, it can be applied to various types of lighting fixtures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a constant illumination control device;

[0033] Figure 2 A control flow diagram of a lighting control method;

[0034] Figure 3 It is a schematic diagram of the module structure of a lighting control system;

[0035] Figure 4 It is a schematic diagram of the structure of the power module and the drive module. DETAILED DESCRIPTION

[0036] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0037] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0038] Embodiment 1

[0039] like Figure 1 The figure shows a structural schematic diagram of a constant illumination control device, the constant illumination control device comprising:

[0040] A collection unit, an adder, a subtractor, a dimming memory, a fill light memory, and a signal adjustment unit; the collection unit is used to collect the analog signal of the light intensity and convert it into a digital signal for output;

[0041] The adder is connected to the acquisition unit, the dimming memory and the fill light memory respectively, so as to add the detection data of the acquisition unit and the fill light data in the fill light memory to obtain the dimming data, and update the dimming data into the dimming memory;

[0042] The signal adjustment unit is connected to the dimming memory and is used to adjust the magnitude of the output signal according to the dimming data in the dimming memory to adjust the external lighting lamp to a corresponding brightness;

[0043] The subtractor is connected to the acquisition unit, the fill light memory and the dimming memory respectively, obtains dimmed data from the acquisition unit, and subtracts the dimmed data from the dimming data in the dimming memory to obtain the fill light data and then updates it into the fill light memory;

[0044] The constant illumination control device also includes a timer, a NOT gate U3, an AND gate U4 and an AND gate U5; the timer is provided with a first signal terminal and a second signal terminal; the first signal terminal is respectively connected to the input terminal of the NOT gate U3 and the first input terminal of the AND gate U5; the output terminal of the NOT gate U3 is connected to the first input terminal of the AND gate U4; the second signal terminal is respectively connected to the second input terminal of the AND gate U4 and the second input terminal of the AND gate U5; the output terminal of the AND gate U4 is connected to the subtractor; the output terminal of the AND gate U5 is connected to the adder.

[0045] When the second signal terminal outputs a high level, the constant illumination control device enters a detection period. During this period, the high level of the first signal terminal starts the adder to perform addition operations to obtain dimming data, and adjusts the brightness of the lighting lamp after updating it to the dimming memory; after the brightness adjustment of the lighting lamp is completed, the first signal terminal becomes a low level to turn off the adder, start the subtractor to perform subtraction operations to obtain fill light data, and update it to the fill light memory; when the second signal terminal outputs a low level, the constant illumination control device enters a detection interval period, and after the detection interval period, the second signal terminal outputs a high level to make the constant illumination control device re-enter the detection period; the first signal terminal and the second signal terminal repeatedly output signals in a cycle to achieve constant illumination control of the lighting lamp.

[0046] In a specific implementation, the signal adjustment unit includes a DA converter and a signal adjustment circuit; the DA converter is coupled to the dimming memory to convert the dimming data in the dimming memory into an analog voltage signal output; the signal adjustment circuit is connected to the DA converter to adjust the output PWM signal duty cycle according to the voltage signal output by the DA converter, thereby adjusting the brightness of the lighting lamp.

[0047] In a specific implementation, the signal adjustment circuit includes a sawtooth wave generator, a comparator U10 and a resistor R101; the input end of the sawtooth wave generator is connected to a clock signal, and the output end is connected to the inverting input end of the comparator U10; the positive input end of the comparator U10 is connected to the DA converter with the input voltage signal as a reference voltage, and the output end is connected to the first end of the resistor R101; the second end of the resistor R101 serves as the PWM signal output end of the signal adjustment circuit.

[0048] In a specific implementation, the constant illumination control device also includes: a transistor U9 and a resistor R102; the timer is provided with a third signal terminal; the collector of the transistor U9 is connected to an external power supply, the emitter is connected to the power supply terminal of the acquisition unit, and the base is connected to the third signal terminal through the resistor R102; during the detection period, the timer outputs a high level to turn on the transistor U9 to power the acquisition unit for acquisition, and during the detection interval, the timer outputs a low level to turn off the transistor U9 to stop powering the acquisition unit to reduce energy consumption.

[0049] Embodiment 2

[0050] like Figure 2 The figure shows a control flow diagram of a lighting control method. In this embodiment, the lighting is a table lamp, and the photodiode D2 is installed in the illumination range of the lighting, but is not limited to the table lamp type and the installation position. The method includes the following steps:

[0051] A lighting control method comprises the following steps:

[0052] S1: Control the photodiode to detect the light intensity of the environment before the light is turned on to obtain detection data, and add the detection data to the fill light data to obtain dimming data;

[0053] S2: Adjust the lighting lamp to the corresponding brightness according to the dimming data;

[0054] S3: Control the photodiode to detect the light intensity of the environment at a preset first time interval to obtain dimming data;

[0055] S4: Obtain fill light data according to the dimming data and the post-dimming data;

[0056] S5: controlling the photodiode to detect the ambient light intensity at a preset second time interval and obtaining inspection data;

[0057] S6: Obtain new dimming data according to the inspection data and the fill light data, and return to step S2.

[0058] The following is a comparison of the scene light intensity, the output voltage of the photodiode D2, and the PWM signal duty cycle set in this embodiment. The comparison values ​​can be adjusted according to the type and accuracy of components and do not constitute a limitation on the scope of protection of this application.

[0059] In a specific implementation, before turning on the lighting, the light intensity of the environment is detected by using the photodiode D2, and the detection data is added to the fill light data with an initial value of 0 to obtain the dimming data. For example, when the ambient light intensity is 500LUX, the voltage detected by the photodiode D2 is 1.5V, that is, the dimming data is 1.5V;

[0060] In a specific implementation, adjusting the lighting lamp to a corresponding brightness according to the dimming data means determining the duty cycle of the control PWM signal according to the dimming data, and outputting the PWM signal to the driving circuit to control the brightness of the lighting lamp. For example, when the detection voltage is 1.5V, the corresponding PWM duty cycle is 60%, and the PWM signal with a duty cycle of 60% is output to control the brightness of the lighting lamp;

[0061] In a specific implementation, at a first time interval (such as 1s), the light intensity of the environment is detected by using the photodiode D2 to obtain the dimming data. For example, a matching circuit is set so that the light intensity obtained by adding the adjusted light to the original ambient light is 1000LUX (other target values, such as 900LUX, can be set as needed. It is only necessary to set the relevant resistance, capacitance and inductance values. It will not be described in detail here. It is only necessary to match according to the actual situation). At this time, the detection voltage is 0.5V, that is, the dimming data is 0.5V;

[0062] In a specific implementation, fill light data is obtained based on the dimming data and the data after dimming. The fill light data is the detection difference of the influence of the light intensity after the lighting lamp is turned on, and also indirectly reflects the increased light intensity at the detection point after the light is turned on. Further, obtaining the fill light data based on the dimming data and the data after dimming means subtracting the post-dimming data from the dimming data to obtain the difference as the fill light data. In this embodiment, the fill light data is 1.5-0.5=1V.

[0063] In a specific implementation, the ambient light intensity is detected according to a set second time interval (such as 30 minutes) and inspection data is obtained. For example, at a certain moment, as the sky darkens, the detected ambient light intensity is 800LUX, and the detected voltage is 0.9V.

[0064] In a specific implementation, obtaining new dimming data based on the inspection data and the fill light data means adding the inspection data to the fill light data to obtain new dimming data; in the embodiment, the new dimming data can be obtained as follows: 0.9+1=1.9V, that is, if the lighting lamp is turned off at this time, the detection voltage of the sensing element should be 1.9V, and the ambient light intensity after the light is turned off should be 300LUX. As long as the inspection data and the fill light data are calculated, the ambient light intensity detection value when the lighting lamp is turned off can be obtained by calculation.

[0065] At this time, return to step 2, the PWM duty cycle corresponding to the new dimming data is 80%, and the light intensity is adjusted according to this value, further increasing the brightness of the lighting lamp, so that the light intensity within the illumination range returns from 800LUX to 1000LUX due to the darkening of the sky, so that the light intensity within the illumination range is stabilized at the set brightness value. In the specific implementation, in order to increase the accuracy and real-time performance of dimming, the inspection interval can be shortened so that the brightness of the lighting lamp can be adjusted in time.

[0066] In the embodiment of the present invention, only the light sensor needs to be controlled to detect the light information at the first and second time intervals in a cycle, so that the light can be accurately controlled to adapt to the current environment without real-time detection, thereby reducing the working frequency of the light sensor. In addition, compared with the prior art, the light sensor needs to be set at a specific position (in order to reduce the impact of the light sensor detection data after turning on the light), and the light sensor of the present invention can be installed at any position of the lamp body.

[0067] At this time, because the new dimming data is 1.9V, the dimming data after dimming again is 0.5V, so the new fill light data can be 1.4V. If the sky continues to get darker, the light intensity detected by the photodiode D2 becomes 800LUX again, the output voltage is 0.9V, and the new dimming data is 1.4+0.9=2.3V again, that is, the ambient light intensity should be 100LUX after turning off the light, which corresponds to writing at night. At this time, a 100% duty cycle PWM signal should be used to drive the lighting lamp to make the light intensity within the irradiation range return to 1000LUX. At this time, because it is already the latest time, the sky cannot continue to get darker, so the light intensity detected by the photodiode D2 will not continue to be lower than 1000LUX.

[0068] At this time, because the new dimming data is 2.3V, the dimming data after dimming again is 0.5V, so the new fill light data can be 1.8V. If the sky does not change, the light intensity detected by the photodiode D2 is always 1000LUX, the output voltage is 0.5V, and the dimming data is 1.8+0.5=2.3V, so that the intensity of the lighting lamp remains unchanged.

[0069] If the sky becomes brighter, the light intensity detected by the photodiode D2 becomes 1100LUX, and the output voltage is 0.3V. The new dimming data is 1.8+0.3=2.1V, that is, the ambient light intensity should be 200LUX after turning off the light, which corresponds to sunrise and sunset. When studying at the desk, a PWM signal with a duty cycle of 90% should be used to drive the lighting to reduce the light intensity back to 1000LUX.

[0070] In a specific implementation, the dimming data, post-dimming data and inspection data are the voltage value, current value or the corresponding PWM duty cycle value output by the photodiode D2, which only need to be further converted, but are still within the control logic method of the present application.

[0071] In a specific implementation, the lighting control method further includes the following steps: during the inspection interval of the patrol inspection, the working power of the sensing module is turned off to save power and reduce energy consumption.

[0072] In a specific implementation, the lighting control method further includes the following steps: setting the inspection time interval according to the required response accuracy.

[0073] Embodiment 3

[0074] The difference between this embodiment and the first embodiment is that the said obtaining the fill light data according to the dimming data and the data after dimming refers to subtracting the dimming data from the data after dimming to obtain the difference as the fill light data. Furthermore, the said obtaining the new dimming data according to the inspection data and the fill light data refers to subtracting the fill light data from the inspection data to obtain the new dimming data. Except for the different operation methods, the obtained fill light data and the new dimming data are the same as those in the first embodiment, and will not be described in detail here. At this point, it is also necessary to replace the adder in the second embodiment with a subtractor, and realize the above data calculation by two subtractors.

[0075] Embodiment 4

[0076] like Figure 3 The figure shows a schematic diagram of the structure of a lighting control system, including: a power module, a photosensitive module, a driving module and the constant illumination control device as described above;

[0077] The power supply module is respectively connected to the photosensitive module, the constant illumination control device and the driving module to provide working power;

[0078] The acquisition unit of the constant illumination control device is connected to the photosensitive module to collect the sensing analog signal of the light intensity from the photosensitive module. After calculation, the signal adjustment unit outputs a signal to control the driving module to adjust the brightness of the lighting lamp.

[0079] In a specific implementation, the power supply end of the photosensitive module is connected to the emitter of the transistor U9, so that when the timer turns off the transistor U9 and stops supplying power to the collection unit, the power supply of the photosensitive module is also turned off to further reduce energy consumption.

[0080] In specific implementation, Figure 2 As shown, the photosensitive module includes a photosensitive diode D2, a capacitor C10, a capacitor C1 and a resistor R3; the anode of the photosensitive diode D2 is connected to the first end of the capacitor C1 and the first end of the capacitor C10 and then grounded; the cathode of the photosensitive diode D2 is connected to the second end of the capacitor C10 and the first end of the resistor R3, and then connected to the acquisition unit as the output end of the photosensitive module; the second end of the capacitor R3 is connected to the second end of the capacitor C1 and then connected to the emitter of the transistor U9. The capacitor C1 is used to stabilize the working voltage input to the photosensitive diode D2, and the capacitor C10 is used to stabilize the detection voltage output by the photosensitive diode D2.

[0081] In specific implementation, Figure 4As shown, the power module includes a power chip BR1, a capacitor EC1, a capacitor EC3, a capacitor EC4, an inductor L8, a resistor R2, a resistor R3, a resistor R4, a resistor R6, a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R17, a resistor R18 and a voltage regulator DZ1; the power chip BR1 is connected in series with the resistor R18 and the resistor R17 to form a rectifier circuit; the resistor R12 and the resistor R11 are connected in series and then connected in parallel with the capacitor EC1 and the capacitor EC4, and the inductor L8 is connected in series between the capacitor EC1 and the capacitor EC4 , to form a driving power supply circuit, the two ends of the capacitor EC1 are connected to the rectifier circuit as driving power supply input ends, and the two ends of the resistor R12 and the resistor R11 connected in series are used as driving power supply output ends; one end of the resistor R2, the resistor R6, the resistor R8 and the resistor R13 connected in parallel is used as a control power supply input end, and the other end is connected in series with the parallel circuit composed of the resistor R10, the resistor R14, the resistor R3 and the resistor R4, and the parallel circuit composed of the voltage regulator DZ1 and the capacitor EC3 to form a control power supply circuit, and the series connection point of the cathode of the voltage regulator DZ1 and the capacitor R3 is used as a control power supply output end. In the control power circuit, resistors R2, R6, R8 and R13 constitute a current limiting circuit, and resistors R10, R14, R3 and R4 constitute a current limiting circuit. Compared with the usual or traditional structure using a single resistor, when the heating power is the same, the structure of the present application uses multiple resistors in parallel and in series, which can not only play a current limiting role, but also increase the heat dissipation area, or disperse it to multiple parts to dissipate heat, improve heat dissipation efficiency, and avoid heat concentration affecting the performance and safety of the device itself and other components. At the same time, the resistors of the present application can use chip resistors according to processing requirements to further reduce costs.

[0082] In specific implementation, Figure 4As shown, the driving module includes a processor U2, a diode D1, an inductor L6, a resistor R1, a capacitor EC2, and a common-mode inductor L4; the cathode of the diode D1 is connected to the first end of the resistor R1, the first end of the capacitor C2, and the first input end of the common-mode inductor L4, and then connected to the output end of the driving power supply circuit; the second input end of the common-mode inductor L4 is connected to the second end of the resistor R1, the second end of the capacitor C2, and the first end of the inductor L6; the second end of the inductor L6 is connected to the anode of the diode D1 and the processor U2; the two output ends of the common-mode inductor L4 are connected to the lighting lamp; the processor U2 is connected to the loop end of the driving power supply circuit through parallel resistors R7 and REC1; the processor U2 is connected to the signal adjustment unit through a resistor R15 to receive the adjusted output signal, and controls the on-off time ratio of the second end of the inductor L6 and the driving power supply circuit loop through an internal switch to control the equivalent voltage input to the lighting lamp and adjust the brightness of the lighting lamp. Resistors R15 and R21 form a voltage divider circuit to convert the PWM signal output by processor U1 to adapt to the voltage requirements of processor U2. A capacitor C4 is also provided in parallel with the input and output terminals of the drive circuit of processor U2 to suppress EMI interference output. EC1 In parallel, it is connected to the 8th pin of the processor U2. The purpose is to let the processor U2 know the current size of the lighting circuit so that the high-frequency conversion can be controlled.

[0083] Principle of use: In this embodiment, when the lighting lamp is turned on for the first time, the third signal terminal of the timer outputs a high level to turn on the transistor U9 to power the photosensitive module and the acquisition unit; if the dimming data measured by the photosensitive module is 1.5V, the acquisition unit collects and converts it into a digital signal and transmits it to the adder and subtractor. The second signal terminal of the timer outputs a high level to make the constant illumination control device enter the detection period. During this period, the first signal terminal first outputs a high level to start the adder. The adder obtains the data of the fill light memory and adds it to the detection data transmitted by the acquisition unit (the initial value of the fill light memory is 0 before the lighting lamp is turned on for the first time) to obtain the dimming data 1.5V, which is updated to the dimming memory. The DA converter converts and outputs the corresponding analog voltage value 1.5V according to the value of the dimming memory. The signal adjustment circuit outputs a PWM signal corresponding to a duty cycle of 60% to the drive module according to the 1.5V voltage value output by the DA converter to adjust the brightness of the lighting lamp. After the brightness adjustment of the lighting lamp is completed (such as an interval of 30 seconds), the first signal end becomes a low level to turn off the adder and start the subtractor. At this time, the lighting lamp has turned on the fill light (the light intensity of the detection point is 1000LUX at this time). As shown in Example 1, the dimming data output by the photosensitive module is 0.5V. The subtractor obtains the dimming data 0.5V from the acquisition unit, and subtracts the dimming data 1.5V in the dimming memory from the dimming data 0.5V to obtain the fill light data 1V and then updates it to the fill light memory.

[0084] After completing this stage of work (achieved by setting the timer), the second signal terminal outputs a low level to make the constant illumination control device enter the detection interval period, and the third signal terminal of the timer simultaneously outputs a low level to turn off the transistor U9, so that the photosensitive module and the acquisition unit stop working to reduce energy consumption. At this time, each memory, DA converter and signal adjustment circuit still remain powered on. After the set time interval, the second signal terminal outputs a high level to make the constant illumination control device re-enter the detection period, and the third signal terminal of the timer also re-outputs a high level to turn on the transistor U9 to power the photosensitive module and the acquisition unit for inspection. Assume that the inspection data output by the photosensitive module at this time is 0.9V, the adder obtains the 1V data of the fill light memory and adds the inspection data 0.9V to obtain the new dimming data 1.9V, the analog voltage value output by the DA converter is 1.9V, and the signal adjustment circuit outputs a PWM signal corresponding to a duty cycle of 80% to the drive module for brightness adjustment. After the adjustment is completed (for example, every 30 seconds), the dimming data is collected again to obtain 0.5V, and the subtractor obtains the data 1.9V in the dimming memory minus the dimming data 0.5V to obtain 1.4V fill light data and update it to the fill light memory. During the detection interval, the first signal end and the second signal end repeatedly output signals to realize constant illumination control of the lighting lamp.

[0085] The present application provides a constant illumination control device and a lighting control system, which obtains dimming data by using a photodiode D2 to detect the light intensity of the environment before turning on the lighting; adjusts the lighting to a corresponding brightness according to the dimming data; then uses the photodiode D2 to detect the light intensity of the environment to obtain dimmed data; obtains fill light data according to the dimming data and the dimmed data; detects the ambient light intensity according to a set time interval and obtains patrol data; obtains new dimming data according to the patrol data and the fill light data. When the photodiode D2 is installed outside the irradiation range, if the detection value of the photodiode D2 is not affected by the light (the surrounding open environment), then the fill light data is 0, and the patrol data is the new dimming data, that is, each time the photodiode D2 only needs to measure the ambient light outside the irradiation range, and adjust the intensity of the lighting according to the intensity of the ambient light, so that the brightness of the lighting plus the brightness of the ambient light can reach the set brightness value. When the photodiode D2 is installed outside the irradiation range, if the detection value of the photodiode D2 is still affected by the light (for example, the photodiode D2 will be affected by diffuse reflection when it is turned on in the house), the fill light data is obtained by two measurements before and after dimming the light. The fill light data can be regarded as the difference of the influence of the light of the lighting lamp on the light intensity of the measuring point; when inspecting at the set interval, the inspection data plus or minus the difference can be obtained to obtain new dimming data, and the new dimming data can be regarded as the ambient light intensity value that the photodiode D2 should measure after turning off the light. Then, the lighting lamp is controlled according to this new dimming data to achieve the set brightness value by filling the ambient light; the same applies to any measuring point where the photodiode D2 is located within the irradiation range. It is only necessary to measure the fill light data of the influence of the light on the light intensity of the measuring point after the measuring point is dimmed. During each inspection, as long as the inspection data and the fill light data are calculated, the ambient light intensity detection value (i.e., the new dimming data) when the lighting lamp is turned off can be obtained by calculation, and the light intensity is adjusted according to this value to stabilize the light intensity within the irradiation range at the set brightness value. At the same time, because the fill light data is obtained through measurement and calculation during each inspection, this feedback control mode is not affected by the installation and measurement position of the photodiode D2, and can be conveniently applied to various measurement structures and scene switching. As long as the measurement value of the photodiode D2 is set to the corresponding value of the control parameter of the lighting fixture, it can be applied to various types of lighting fixtures.

[0086] In the description of the present invention, it is necessary to understand that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0087] In the present invention, unless otherwise clearly specified and limited, the first feature "on" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0088] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] The above is only for explaining the implementation mode of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention without creative work should be included in the protection scope of the present invention.

Claims

1. A constant illumination control device, characterized in that: The constant illumination control device comprises: A collection unit, an adder, a subtractor, a dimming memory, a fill light memory, and a signal adjustment unit; the collection unit is used to collect the sensing analog signal of the light intensity and convert the sensing analog signal into a digital signal for output; The adder is connected to the acquisition unit, the dimming memory and the fill light memory respectively, so as to add the detection data of the acquisition unit and the fill light data in the fill light memory to obtain the dimming data, and update the dimming data into the dimming memory; The signal adjustment unit is connected to the dimming memory and is used to adjust the magnitude of the output signal according to the dimming data in the dimming memory to adjust the external lighting lamp to a corresponding brightness; The subtractor is connected to the acquisition unit, the fill light memory and the dimming memory respectively, obtains dimmed data from the acquisition unit, and subtracts the dimmed data from the dimming data in the dimming memory to obtain the fill light data and then updates it into the fill light memory; The constant illumination control device further comprises a timer, a NOT gate U3, an AND gate U4 and an AND gate U5; the timer is provided with a first signal terminal and a second signal terminal; the first signal terminal is respectively connected to the input terminal of the NOT gate U3 and the first input terminal of the AND gate U5; the output terminal of the NOT gate U3 is connected to the first input terminal of the AND gate U4; the second signal terminal is respectively connected to the second input terminal of the AND gate U4 and the second input terminal of the AND gate U5; the output terminal of the AND gate U4 is connected to the subtractor; the output terminal of the AND gate U5 is connected to the adder; A lighting control method, the method is applied to the constant illumination control device, the method comprises the following steps: S1: Control the photodiode to detect the light intensity of the environment before the light is turned on to obtain detection data, and add the detection data to the fill light data to obtain the dimming data; S2: Adjust the lighting lamp to the corresponding brightness according to the dimming data; S3: Control the photodiode to detect the light intensity of the environment at a preset first time interval to obtain dimming data; S4: Obtain fill light data according to the dimming data and the post-dimming data; S5: controlling the photodiode to detect the ambient light intensity at a preset second time interval and obtaining inspection data; S6: Obtain new dimming data according to the inspection data and the fill light data, and return to step S2.

2. The constant illumination control device according to claim 1, characterized in that: The signal adjustment unit includes a DA converter and a signal adjustment circuit; the DA converter is coupled to the dimming memory; and the signal adjustment circuit is connected to the DA converter.

3. The constant illumination control device according to claim 2, characterized in that: The signal adjustment circuit includes a sawtooth wave generator, a comparator U10 and a resistor R101; the input end of the sawtooth wave generator is connected to the clock signal, and the output end is connected to the inverting input end of the comparator U10; the positive input end of the comparator U10 is connected to the DA converter with the input voltage signal as the reference voltage, and the output end is connected to the first end of the resistor R101; the second end of the resistor R101 serves as the PWM signal output end of the signal adjustment circuit.

4. The constant illumination control device according to any one of claims 1 to 3, characterized in that: The constant illumination control device also includes: a transistor U9 and a resistor R102; the timer is provided with a third signal terminal; the collector of the transistor U9 is connected to an external power supply, the emitter is connected to the power supply terminal of the acquisition unit, and the base is connected to the third signal terminal through the resistor R102.

5. A lighting control system, characterized in that: include: A power module, a photosensitive module, a driving module and a constant illumination control device as claimed in claim 4; The power supply module is respectively connected to the photosensitive module, the constant illumination control device and the driving module to provide working power; The acquisition unit of the constant illumination control device is connected to the photosensitive module to collect the sensing analog signal of the light intensity from the photosensitive module. After calculation, the signal adjustment unit outputs a signal to control the driving module to adjust the brightness of the lighting lamp.

6. The lighting control system according to claim 5, characterized in that: The power supply end of the photosensitive module is connected to the emitter of the transistor U9; the photosensitive module includes a photosensitive diode D2, a capacitor C10, a capacitor C1 and a resistor R3; the anode of the photosensitive diode D2 is connected to the first end of the capacitor C1 and the first end of the capacitor C10 and then grounded; the cathode of the photosensitive diode D2 is connected to the second end of the capacitor C10 and the first end of the resistor R3, and then connected to the collection unit as the output end of the photosensitive module; the second end of the resistor R3 is connected to the second end of the capacitor C1 and then connected to the emitter of the transistor U9.

7. The lighting control system according to claim 5, characterized in that: The power module includes a rectifier circuit and a control power circuit; the rectifier circuit is connected to the control power circuit; the control power circuit includes resistor R2, resistor R6, resistor R8, resistor R13, resistor R10, resistor R14, resistor R3, resistor R4, a voltage regulator DZ1 and a capacitor EC3, wherein the resistor R2, resistor R6, resistor R8 and resistor R13 are connected in parallel, the resistor R10, resistor R14, resistor R3 and resistor R4 are connected in parallel, the voltage regulator DZ1 is connected in parallel with the capacitor EC3, and the three parallel circuits are connected in series and then grounded; the cathode of the voltage regulator DZ1 and the parallel point of the resistor R3 are connected to the collector of the transistor U9 as the output end of the control power circuit, and the anode is grounded.

8. The lighting control system according to claim 7, characterized in that: The power module also includes a driving power circuit; the driving power circuit includes a resistor R12, a resistor R11, a capacitor EC1, a capacitor EC4 and an inductor L8, wherein the resistor R12 and the resistor R11 are connected in series and then connected in parallel with the capacitor EC1 and the capacitor EC4, and the inductor L8 is connected in series between the capacitor EC1 and the capacitor EC4.

9. The lighting control system according to claim 8, characterized in that: The driving module includes a processor U2, a diode D1, an inductor L6, a resistor R1, a capacitor EC2, and a common-mode inductor L4; the cathode of the diode D1 is connected to the first end of the resistor R1, the first end of the capacitor EC2, and the first input end of the common-mode inductor L4, and then connected to the output end of the driving power supply circuit; the second input end of the common-mode inductor L4 is connected to the second end of the resistor R1, the second end of the capacitor EC2, and the first end of the inductor L6; the second end of the inductor L6 is connected to the anode of the diode D1 and the processor U2; the two output ends of the common-mode inductor L4 are connected to the lighting lamp; the processor U2 is connected to the loop end of the driving power supply circuit through the parallel resistor R7 and the resistor REC1; the processor U2 is connected to the signal adjustment unit through the resistor R15.

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