CN116367393A - Lighting device and automatic dimming circuit for same - Google Patents

Lighting device and automatic dimming circuit for same Download PDF

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Publication number
CN116367393A
CN116367393A CN202310396317.0A CN202310396317A CN116367393A CN 116367393 A CN116367393 A CN 116367393A CN 202310396317 A CN202310396317 A CN 202310396317A CN 116367393 A CN116367393 A CN 116367393A
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China
Prior art keywords
signal
circuit
resistor
adjusting
detection signal
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CN202310396317.0A
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Chinese (zh)
Inventor
张华成
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Wuxi Ruilan Intelligent Technology Co ltd
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Wuxi Ruilan Intelligent Technology Co ltd
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Priority to CN202310396317.0A priority Critical patent/CN116367393A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a lighting device and an automatic dimming circuit for the same, the automatic dimming circuit comprises: the signal acquisition unit is used for acquiring an ambient light detection signal and a human body detection signal of the illumination area; the first signal processing unit is used for performing signal processing on the ambient light detection signal and outputting a first adjusting signal; the second signal processing unit is used for performing signal processing on the human body detection signal and outputting a second adjusting signal; the dimming control unit is used for outputting a group of dimming control signals according to the first adjusting signal and the second adjusting signal, and the power-off control priority of the first adjusting signal is higher than that of the second adjusting signal; and the driving unit is used for adjusting the brightness and the color of the light-emitting unit according to the dimming control signal. According to the invention, the brightness and the color of the light-emitting unit are correspondingly adjusted by detecting the induction ambient light and the human body signal, so that the automatic control of the lighting equipment is realized, and the lighting economy and the energy conservation are improved.

Description

Lighting device and automatic dimming circuit for same
Technical Field
The present invention relates to the field of lighting control technologies, and in particular, to a lighting device and an automatic dimming circuit for the lighting device.
Background
LED lamps are becoming more and more popular in modern life, and most of the traditional LED lamps are controlled by physical switches, and some are controlled by voice-controlled switches. The former is inconvenient to use at night, and the latter can be triggered by mistake when the user makes a little sound at home.
In the prior art, partial LED lamps adopt an ambient light induction control mode, namely the LED lamps are automatically lightened in a dark environment, and the following problems exist: because the LED lamps are different in use scenes, in the area with smaller people flow, the LED lamps are started simply based on ambient light induction, so that resource waste is easy to cause, and the economical efficiency and the environmental protection are poor; the mode that adopts ambient light induction control mode and acoustic control to combine together easily takes place to mistake and triggers, influences the use experience.
Disclosure of Invention
The invention provides a lighting device and an automatic dimming circuit for a light-emitting assembly, which are used for solving the problem that the existing LED lamp is subjected to induction control based on ambient brightness and sound control and is easy to trigger by mistake, and improving the lighting economy and energy conservation.
According to an aspect of the present invention, there is provided an automatic dimming circuit for a lighting device provided with at least one group of light emitting units, the automatic dimming circuit comprising: the signal acquisition unit is used for acquiring an ambient light detection signal and a human body detection signal of the illumination area; the first signal processing unit is used for performing signal processing on the ambient light detection signal and outputting a first adjusting signal; the second signal processing unit is used for performing signal processing on the human body detection signal and outputting a second adjusting signal; the dimming control unit is used for outputting a group of dimming control signals according to the first adjusting signal and the second adjusting signal, wherein the power-off control priority of the first adjusting signal is higher than that of the second adjusting signal; and the driving unit is used for adjusting the brightness and the color of the light-emitting unit according to the dimming control signal.
Optionally, the first signal processing unit includes: the circuit comprises a detection circuit, a voltage following circuit and a first filter circuit; the detection circuit is used for outputting a voltage detection signal according to the ambient light detection signal; the voltage follower circuit is used for carrying out voltage follower on the voltage detection signal and outputting a voltage follower signal; the first filter circuit is used for carrying out filter processing on the voltage following signal and outputting the filtered signal to the dimming control unit as a first adjusting signal.
Optionally, the detection circuit includes a first resistor, and the voltage follower circuit includes: a first operational amplifier and a second resistor; the first end of the first resistor is connected with a power supply, the second end of the first resistor is electrically connected with the signal acquisition unit, a sampling node is arranged between the first resistor and the signal acquisition unit, and the sampling node is used for outputting the voltage detection signal; the first input end of the first operational amplifier is electrically connected with the sampling node through the second resistor, the second input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected with the first filter circuit.
Optionally, the second signal processing unit includes: the second filter circuit, the third filter circuit and the amplifying circuit; the second filter circuit is used for carrying out high-pass filtering on the human body detection signal and outputting a high-pass filtering signal; the input end of the amplifying circuit is electrically connected with the second filtering circuit, the output end of the amplifying circuit is electrically connected with the third filtering circuit, and the amplifying circuit is used for amplifying the high-pass filtering signal and outputting an amplified signal; the third filter circuit is used for performing low-pass filtering processing on the amplified signal and transmitting the low-pass filtered signal to the dimming control unit.
Optionally, the amplifying circuit includes: the second operational amplifier, the series resistance-capacitance formed by the third resistor and the first capacitor, and the parallel resistance-capacitance formed by the fourth resistor and the second capacitor; the first input end of the second operational amplifier is electrically connected with the second filter circuit, the second input end of the second operational amplifier is grounded through the series resistance-capacitance, and the second input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier through the parallel resistance-capacitance.
Optionally, the light emitting units include a first color light emitting unit, a second color light emitting unit, and a third color light emitting unit having different colors; the driving unit includes: a first driving circuit, a second driving circuit, and a third driving circuit; the first driving circuit is used for receiving a first dimming control signal and adjusting the brightness and the color of the first color light-emitting unit according to the first dimming control signal; the second driving circuit is used for receiving a second dimming control signal and adjusting the brightness and the color of the second color light-emitting unit according to the second dimming control signal; the third driving circuit is used for receiving a third dimming control signal and adjusting the brightness and the color of the third color light-emitting unit according to the third dimming control signal; the circuit structures of the first driving circuit, the second driving circuit and the third driving circuit are identical.
Optionally, the first driving circuit includes: the first switch tube, the second switch tube, the third resistor and the fourth resistor; the control end of the first switching tube is electrically connected with the first output end of the dimming control unit through the third resistor, the input end of the first switching tube is electrically connected with the first color light-emitting unit, and the output end of the first switching tube is grounded through the fourth resistor; the control end of the second switching tube is electrically connected with the output end of the first switching tube, the input end of the second switching tube is electrically connected with the control end of the first switching tube, and the output end of the second switching tube is grounded.
Optionally, the dimming control unit is provided with at least two input interfaces and at least three output interfaces; the input interface is used for receiving the ambient light detection signal or the human body detection signal; the output interface is used for outputting any one path of dimming control signal.
Optionally, the signal acquisition unit includes: the photosensitive detector is used for acquiring the ambient light detection signal, and the pyroelectric sensor is used for acquiring the human body detection signal.
According to another aspect of the present invention, there is provided a lighting device comprising: the automatic dimming circuit is used for adjusting the brightness and the color of the light-emitting units according to the ambient light detection signal and the human body detection signal of the illumination area.
According to the technical scheme, the automatic dimming circuit is provided with a signal acquisition unit, a first signal processing unit, a second signal processing unit, a dimming control unit and a driving unit, wherein the signal acquisition unit acquires an ambient light detection signal and a human body detection signal of an illumination area, and the first signal processing unit performs signal processing on the ambient light detection signal and outputs a first adjusting signal; the second signal processing unit is used for performing signal processing on the human body detection signal and outputting a second adjusting signal; the dimming control unit outputs a group of dimming control signals according to the first adjusting signal and the second adjusting signal; the driving unit adjusts the brightness and color of the light emitting unit according to the dimming control signal. Through detecting response ambient light and human signal, correspond luminance and the colour of adjusting the luminescence unit, realize lighting apparatus's automatic control, solved current LED lamp and based on ambient brightness and sound control carry out the response control, take place the problem of false triggering easily, be favorable to improving illumination economy and energy-conserving nature, promote use experience.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an automatic dimming circuit for a lighting device according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an automatic dimming circuit according to a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another automatic dimming circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another automatic dimming circuit according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dimming control unit according to a first embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic structural diagram of an automatic dimming circuit for a lighting device according to a first embodiment of the present invention, which is applicable to indoor and outdoor lighting control. Typically, the application scenarios of the automatic dimming circuit and the lighting device include, but are not limited to: indoor hallways, district hallways, parks, etc.
In an embodiment of the invention, the lighting device is provided with at least one set of light emitting units. The light emitting unit may be a plurality of color light emitting units having different colors. Typically, the color light emitting unit may be an LED lamp that mixes red, green and blue lights.
As shown in fig. 1, the automatic dimming circuit includes: a signal acquisition unit 100 for acquiring an ambient light detection signal and a human body detection signal of an illumination area; the first signal processing unit 200 is configured to perform signal following and filtering processing on the ambient light detection signal, and output a first adjustment signal, where the first adjustment signal may be an analog signal; the second signal processing unit 300 is configured to perform signal amplification processing on the human body detection signal, and output a second adjustment signal, where the second adjustment signal may be an analog signal; a dimming control unit 400 for outputting a group of dimming control signals according to the first and second adjustment signals, wherein the power-off control priority of the first adjustment signal is higher than the power-off control priority of the second adjustment signal; and a driving unit 500 for adjusting the brightness and color of the light emitting unit according to the dimming control signal.
The ambient light detection signal may be an ambient light intensity detection signal; the human body detection signal can be a human body infrared pyroelectric detection signal.
In the embodiment of the invention, the light brightness can be automatically adjusted according to the light intensity of the sensing area, and different light colors can be formulated.
Specifically, the signal acquisition unit 100 is disposed in the sensing area, and during the night, the signal acquisition unit 100 outputs a first ambient light detection signal with a light intensity matching at night, and the first signal processing unit 200 performs voltage following and filtering processing on the first ambient light detection signal and outputs a first adjustment signal matching with the first ambient light detection signal; when a human body approaches the sensing area, a weak electric signal with the frequency of about 1HZ is output, the signal acquisition unit 100 outputs a first human body detection signal, the second signal processing unit 300 performs signal amplification processing on the first human body detection signal and outputs a second adjusting signal matched with the first human body detection signal, the dimming control unit 400 outputs a group of dimming control signals according to the current first adjusting signal and the second adjusting signal, the driving unit 500 automatically turns on light, and adjusts the brightness and the color of the light emitting unit according to the group of dimming control signals, so that the light emitting unit outputs the brightness and the color matched with the current light intensity; when the human body leaves the sensing area for a specific time, for example, 10 seconds, the electric signal emitted by the human body disappears, the signal acquisition unit 100 outputs a second human body detection signal, the second signal processing unit 300 performs signal amplification processing on the second human body detection signal and outputs a second adjustment signal matched with the second human body detection signal, the dimming control unit 400 outputs a group of dimming control signals according to the current first adjustment signal and the second adjustment signal, and the driving unit 500 automatically turns off the light.
During daytime, the signal acquisition unit 100 outputs a second ambient light detection signal with the intensity of light being matched at night, the first signal processing unit 200 performs voltage following and filtering processing on the second ambient light detection signal, and outputs a first adjustment signal matched with the second ambient light detection signal, at this time, the first adjustment signal is used for controlling the light to be turned off, and since the power-off control priority of the first adjustment signal is higher than the power-off control priority of the second adjustment signal, the dimming control unit 400 and the driving unit 500 do not turn on the light when the human body reaches the sensing area. Through detecting response ambient light and human detection signal and corresponding signal processing, control luminescence unit is automatic opens and stops to correspond luminance and the colour of adjusting luminescence unit, realize lighting apparatus's automatic control, avoid luminescence unit during daytime or unmanned the time of passing malfunction, solved current LED lamp and based on ambient brightness and sound control carry out the response control, take place the problem of false triggering easily, be favorable to improving illumination economy and energy-conserving nature, promote the use experience.
In one embodiment, the signal acquisition unit 100 includes: the device comprises a photosensitive detector and a pyroelectric sensor, wherein the photosensitive detector is used for acquiring an ambient light detection signal, and the pyroelectric sensor is used for acquiring a human body detection signal.
Wherein the photosensitive detector may be a photosensitive tube. The tube core of the photosensitive tube is a PN junction with photosensitive characteristic and has unidirectional conductivity, so that a reverse voltage is required to be applied during operation. In the absence of illumination, there is little saturated reverse leakage current, i.e. dark current, at which point the photo-transistor is turned off. When illuminated, the saturated reverse leakage current increases substantially, forming a photocurrent that varies with the incident light intensity. Thus, the light intensity can be detected by the light-sensitive tube according to the change caused by the current.
The working principle of the pyroelectric sensor is that the sensor receives radiant energy to cause temperature rise by utilizing the radiant heat effect, so that the temperature-dependent performance in the sensor is changed. Detecting a change in a property of the radiation can detect the radiation. Radiation is detected in most cases by thermoelectric changes. When the element receives radiation, causing a physical change in the non-charge, the corresponding change in charge can be measured by appropriate transformation.
In an embodiment, the first signal processing unit 200 may be a photosensitive signal processing circuit, and the second signal processing unit 300 may be a pyroelectric signal processing circuit.
Optionally, fig. 2 is a schematic circuit diagram of an automatic dimming circuit according to a first embodiment of the present invention, and an embodiment of a photosensitive signal processing circuit is schematically shown.
As shown in fig. 2, the first signal processing unit 200 includes: a detection circuit 210, a voltage follower circuit 220, and a first filter circuit 230; the detection circuit 210 is configured to output a voltage detection signal according to the ambient light detection signal; the voltage follower circuit 220 is configured to perform voltage following on the voltage detection signal and output a voltage following signal; the first filter circuit 230 is configured to perform a filtering process on the voltage following signal, and output the filtered signal to the dimming control unit 400 as a first adjustment signal.
As shown in fig. 2, the detection circuit 210 includes a first resistor R1, and the voltage follower circuit includes: a first operational amplifier U1 and a second resistor R2; the first end of the first resistor R1 is connected with a power supply VCC, the second end of the first resistor R1 is electrically connected with the photosensitive detector 101 of the signal acquisition unit 100, a sampling node A is arranged between the first resistor R1 and the photosensitive detector, and the sampling node A is used for outputting a voltage detection signal; the first input end (for example, the in-phase input end) of the first operational amplifier U1 is electrically connected with the sampling node a through the second resistor R2, the second input end (for example, the inverting input end) of the first operational amplifier U1 is electrically connected with the output end of the first operational amplifier U1, the output end of the first operational amplifier U1 is electrically connected with the first filter circuit 230, the power supply end of the first operational amplifier U1 is connected with the power supply VCC, and the first voltage stabilizing capacitor C20 can be set to perform voltage stabilizing filtering on the power supply VCC.
As shown in fig. 2, the first filter circuit 230 includes a first filter resistor R10 and a first filter capacitor C10, a first end of the first filter resistor R10 is electrically connected to the output end of the first operational amplifier U1, a second end of the first filter resistor R10 is grounded through the first filter capacitor C10, an output node B is disposed between the first filter resistor R10 and the first filter capacitor C10, and the output node B is electrically connected to the first input end of the dimming control unit 400.
Specifically, as shown in connection with fig. 2, the first signal processing unit 200 is a photosensitive signal processing circuit provided based on the photosensitive detector 101 (e.g., a photosensitive tube). The first signal processing unit 200 mainly includes a voltage follower composed of a first operational amplifier U1. The photo detector 101 is connected in series with a first resistor R1 to a power supply VCC. When the external light intensity changes, the saturation reverse leakage current of the photosensitive detector 101 greatly increases, thereby causing the voltage across the photosensitive detector 101 to change. At this time, the voltages at the two ends of the photosensitive detector 101 are unstable and are easily interfered by external connection, after entering the overvoltage follower, the output impedance is reduced, the anti-interference capability is increased, and after the interference signals are filtered by the first filter circuit 230 formed by the first filter resistor R10 and the first filter capacitor C10, the first adjustment signals are obtained and transmitted to the dimming control unit 400 to participate in the subsequent logic processing. The voltage follower is arranged to stabilize the ambient light intensity detection signal, so that the anti-interference capability of the ambient light intensity detection signal is improved, misoperation is avoided, the circuit structure is simple, and the reliability is high.
Optionally, fig. 3 is a schematic circuit diagram of another automatic dimming circuit according to the first embodiment of the present invention, and on the basis of fig. 1, a specific implementation of a pyroelectric signal processing circuit is schematically shown.
As shown in fig. 3, the second signal processing unit 300 is a pyroelectric signal processing circuit configured based on the pyroelectric sensor 102, and a power supply end of the pyroelectric sensor 102 is electrically connected to the power supply VCC, and a second voltage stabilizing capacitor C40 may be configured to perform voltage stabilizing filtering on the power supply VCC.
As shown in fig. 3, the second signal processing unit 300 includes: a second filter circuit 310, a third filter circuit 320, and an amplifying circuit 330; the second filter circuit 310 is configured to perform high-pass filtering on the human body detection signal output by the pyroelectric sensor 102, and output a high-pass filtered signal; the input end of the amplifying circuit 330 is electrically connected with the second filtering circuit 310, the output end of the amplifying circuit 330 is electrically connected with the third filtering circuit 320, and the amplifying circuit 330 is used for amplifying the high-pass filtering signal and outputting an amplified signal; the third filter circuit 320 is configured to perform low-pass filtering processing on the amplified signal, and transmit the low-pass filtered signal as a second adjustment signal to the dimming control unit 400.
As shown in fig. 3, the second filter circuit 310 includes a second filter capacitor C31 and a second filter resistor R31, and the third filter circuit 320 includes a third filter capacitor C32 and a third filter resistor R32. The second filter capacitor C31 and the second filter resistor R31 form a high-pass filter, and the third filter capacitor C32 and the third filter resistor R32 form a low-pass filter, so that specific resistance-capacitance values are not limited.
As shown in fig. 3, the amplifying circuit 330 includes: the second operational amplifier U2, a series resistance-capacitance formed by the third resistor R3 and the first capacitor C1, and a parallel resistance-capacitance formed by the fourth resistor R4 and the second capacitor C2; the first input end (for example, the in-phase input end) of the second operational amplifier U2 is electrically connected to the second filter circuit 310, the second input end (for example, the inverting input end) of the second operational amplifier U2 is grounded through a series resistor-capacitor, the second input end of the second operational amplifier U2 is electrically connected to the output end of the second operational amplifier U2 through a parallel resistor-capacitor, and the output end of the second operational amplifier U2 is further electrically connected to the dimming control unit 400 through the third filter circuit 320.
It should be noted that, the resistance-capacitance values of the third resistor R3, the first capacitor C1, the fourth resistor R4, and the second capacitor C2 may be set based on the signal amplification requirement, and the specific values thereof are not limited.
Specifically, as shown in fig. 3, the second signal processing unit 300 is mainly composed of a second order filter composed of a second operational amplifier U2 and a resistor capacitor. Pyroelectric sensor 102 may be a pyroelectric tube. When the human body approaches, a weak electric signal with the frequency of about 1HZ is output, the second filter capacitor C31 and the second filter resistor R31 form a high-pass filter, the direct current component output by the pyroelectric sensor 102 is isolated, the amplification circuit 330 amplifies the weak electric signal output by the pyroelectric sensor 102, for example, the amplification factor may be 11 times, and finally, the weak electric signal passes through a low-pass filter formed by the third filter capacitor C32 and the third filter resistor R32 to output a second adjusting signal, and the second adjusting signal is transmitted to the dimming control unit 400 to participate in subsequent logic processing. By arranging the amplifying circuit and the second-order filter, the human body detection signal is amplified and filtered, the human body signal detection capability is improved, misoperation is avoided, the circuit structure is simple, and the reliability is high.
Optionally, fig. 4 is a schematic circuit diagram of still another automatic dimming circuit according to the first embodiment of the present invention, and illustrates a specific implementation of a driving unit.
As shown in fig. 4, the light emitting unit includes a first color light emitting unit r_led, a second color light emitting unit g_led, and a third color light emitting unit b_led having different colors, and the first color light emitting unit r_led, the second color light emitting unit g_led, and the third color light emitting unit b_led form a group of color light emitting units, and color adjustment of the color light emitting units can be achieved by adjusting light emission luminance of the first color light emitting unit r_led, the second color light emitting unit g_led, and the third color light emitting unit b_led.
As shown in fig. 4, the driving unit 500 includes: a first driving circuit 510, a second driving circuit 520, and a third driving circuit 530; the first driving circuit 510 is configured to receive a first dimming control signal, and adjust the brightness and color of the first color light emitting unit r_led according to the first dimming control signal; the second driving circuit 520 is configured to receive the second dimming control signal and adjust the brightness and color of the second color light emitting unit g_led according to the second dimming control signal; the third driving circuit 530 is configured to receive a third dimming control signal, and adjust the brightness and color of the third color light emitting unit b_led according to the third dimming control signal; the circuit structures of the first driving circuit 510, the second driving circuit 520 and the third driving circuit 530 are identical.
As shown in fig. 4, the first driving circuit 510 includes: the first switching tube Q1, the second switching tube Q2, the fifth resistor R5 and the sixth resistor R6; the control end of the first switching tube Q1 is electrically connected with a first output interface R_PWM of the dimming control unit 400 through a fifth resistor R5, the input end of the first switching tube Q1 is electrically connected with the first color light emitting unit R_LED, and the output end of the first switching tube Q1 is grounded through a sixth resistor R6; the control end of the second switching tube Q2 is electrically connected with the output end of the first switching tube Q1, the input end of the second switching tube Q2 is electrically connected with the control end of the first switching tube Q1, and the output end of the second switching tube Q2 is grounded.
As shown in fig. 4, the second driving circuit 520 includes: the third switching tube Q3, the fourth switching tube Q4, the seventh resistor R7 and the eighth resistor R8; the control end of the third switching tube Q3 is electrically connected with the second output interface G_PWM of the dimming control unit 400 through a seventh resistor R7, the input end of the third switching tube Q3 is electrically connected with the second color light emitting unit G_LED, and the output end of the third switching tube Q3 is grounded through an eighth resistor R8; the control end of the fourth switching tube Q4 is electrically connected with the output end of the third switching tube Q3, the input end of the fourth switching tube Q4 is electrically connected with the control end of the third switching tube Q3, and the output end of the fourth switching tube Q4 is grounded.
As shown in fig. 4, the third driving circuit 530 includes: a fifth switching tube Q5, a sixth switching tube Q6, a ninth resistor R9 and a tenth resistor 10; the control end of the fifth switching tube Q5 is electrically connected with a third output interface B_PWM of the dimming control unit 400 through a ninth resistor R9, the input end of the fifth switching tube Q5 is electrically connected with a third color light emitting unit B_LED, and the output end of the fifth switching tube Q5 is grounded through a tenth resistor 10; the control end of the sixth switching tube Q6 is electrically connected with the output end of the fifth switching tube Q5, the input end of the sixth switching tube Q6 is electrically connected with the control end of the fifth switching tube Q5, and the output end of the sixth switching tube Q6 is grounded.
In the embodiment of the present invention, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and the sixth switching tube Q6 may be NPN transistors, the collector of the transistors being the input terminal of the switching tube, the emitter of the transistors being the output terminal of the switching tube, and the base of the transistors being the control terminal of the switching tube.
Specifically, as shown in fig. 4, the driving unit 500 is an RGB LED lamp driving circuit, and is mainly composed of a constant current driving circuit composed of 6 triodes (Q1-Q6) and resistors. The dimming control unit 400 may control brightness and color variation of the corresponding first, second and third color light emitting units r_led, g_led and b_led by controlling square wave duty ratios of the 3 interfaces r_pwm, g_pwm and b_pwm. By arranging the constant current driving circuit, the LED luminous intensity is ensured to be stable and consistent, and the luminous effect is improved.
Optionally, fig. 5 is a schematic structural diagram of a dimming control unit according to a first embodiment of the present invention, and an embodiment of the dimming control unit is shown schematically.
As shown in fig. 5, the dimming control unit 400 may be a single-chip microcomputer chip, where the single-chip microcomputer chip is provided with at least two input interfaces and at least three output interfaces; the input interface is used for receiving an ambient light detection signal or a human body detection signal; the output interface is used for outputting any path of dimming control signals. The singlechip chip is also provided with a power supply pin and a grounding pin, wherein the power supply pin is used for being connected with a power supply VCC, and the grounding pin is used for grounding GND.
Specifically, referring to fig. 5, the dimming control unit 40 is a single-chip controller, and an input interface of the dimming control unit 40 is connected to the first signal processing unit 200 (for example, a photosensitive signal processing circuit) and receives a first adjustment signal light_sense; the other input interface is connected to the second signal processing unit 300 (for example, a pyroelectric signal processing circuit) and receives the second adjustment signal ir_sense; after the dimming control unit 40 logically determines the first adjusting signal and the second adjusting signal, a specific group of dimming control signals is output, wherein the first output interface r_pwm outputs the first dimming control signal to the driving circuit of the first color light emitting unit r_led, the second output interface g_pwm outputs the second dimming control signal to the driving circuit of the second color light emitting unit g_led, and the third output interface b_pwm outputs the third dimming control signal to the driving circuit of the third color light emitting unit b_led, thereby realizing brightness and color adjustment of the RGB LED lamp beads.
Example two
Based on the same inventive concept, a second embodiment of the present invention provides a lighting apparatus, including: at least one group of light-emitting units and the automatic dimming circuit provided by any of the embodiments. The automatic dimming circuit is used for adjusting the brightness and the color of the light-emitting unit according to the ambient light detection signal and the human body detection signal of the illumination area.
The embodiment of the invention provides a lighting device, which is provided with an automatic dimming circuit, wherein the automatic dimming circuit is provided with a signal acquisition unit, a first signal processing unit, a second signal processing unit, a dimming control unit and a driving unit, the signal acquisition unit acquires an ambient light detection signal and a human body detection signal of a lighting area, and the first signal processing unit performs signal processing on the ambient light detection signal and outputs a first adjusting signal; the second signal processing unit is used for performing signal processing on the human body detection signal and outputting a second adjusting signal; the dimming control unit outputs a group of dimming control signals according to the first adjusting signal and the second adjusting signal; the driving unit adjusts the brightness and color of the light emitting unit according to the dimming control signal. Through detecting response ambient light and human signal, correspond luminance and the colour of adjusting the luminescence unit, realize lighting apparatus's automatic control, solved current LED lamp and based on ambient brightness and sound control carry out the response control, take place the problem of false triggering easily, be favorable to improving illumination economy and energy-conservation.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. An automatic dimming circuit for a lighting device provided with at least one set of lighting units, the automatic dimming circuit comprising:
the signal acquisition unit is used for acquiring an ambient light detection signal and a human body detection signal of the illumination area;
the first signal processing unit is used for performing signal processing on the ambient light detection signal and outputting a first adjusting signal;
the second signal processing unit is used for performing signal processing on the human body detection signal and outputting a second adjusting signal;
the dimming control unit is used for outputting a group of dimming control signals according to the first adjusting signal and the second adjusting signal, wherein the power-off control priority of the first adjusting signal is higher than that of the second adjusting signal;
and the driving unit is used for adjusting the brightness and the color of the light-emitting unit according to the dimming control signal.
2. The automatic dimming circuit of claim 1, wherein the first signal processing unit comprises: the circuit comprises a detection circuit, a voltage following circuit and a first filter circuit;
the detection circuit is used for outputting a voltage detection signal according to the ambient light detection signal;
the voltage follower circuit is used for carrying out voltage follower on the voltage detection signal and outputting a voltage follower signal;
the first filter circuit is used for carrying out filter processing on the voltage following signal and outputting the filtered signal to the dimming control unit as a first adjusting signal.
3. The automatic dimming circuit of claim 2, wherein the detection circuit comprises a first resistor, and the voltage follower circuit comprises: a first operational amplifier and a second resistor;
the first end of the first resistor is connected with a power supply, the second end of the first resistor is electrically connected with the signal acquisition unit, a sampling node is arranged between the first resistor and the signal acquisition unit, and the sampling node is used for outputting the voltage detection signal;
the first input end of the first operational amplifier is electrically connected with the sampling node through the second resistor, the second input end of the first operational amplifier is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is electrically connected with the first filter circuit.
4. The automatic dimming circuit of claim 1, wherein the second signal processing unit comprises: the second filter circuit, the third filter circuit and the amplifying circuit;
the second filter circuit is used for carrying out high-pass filtering on the human body detection signal and outputting a high-pass filtering signal;
the input end of the amplifying circuit is electrically connected with the second filtering circuit, the output end of the amplifying circuit is electrically connected with the third filtering circuit, and the amplifying circuit is used for amplifying the high-pass filtering signal and outputting an amplified signal;
the third filter circuit is used for performing low-pass filtering processing on the amplified signal and transmitting the low-pass filtered signal to the dimming control unit.
5. The automatic dimming circuit of claim 4, wherein the amplification circuit comprises: the second operational amplifier, the series resistance-capacitance formed by the third resistor and the first capacitor, and the parallel resistance-capacitance formed by the fourth resistor and the second capacitor;
the first input end of the second operational amplifier is electrically connected with the second filter circuit, the second input end of the second operational amplifier is grounded through the series resistance-capacitance, and the second input end of the second operational amplifier is electrically connected with the output end of the second operational amplifier through the parallel resistance-capacitance.
6. The automatic dimming circuit of claim 1, wherein the light emitting units comprise a first color light emitting unit, a second color light emitting unit, and a third color light emitting unit having different colors;
the driving unit includes: a first driving circuit, a second driving circuit, and a third driving circuit;
the first driving circuit is used for receiving a first dimming control signal and adjusting the brightness and the color of the first color light-emitting unit according to the first dimming control signal;
the second driving circuit is used for receiving a second dimming control signal and adjusting the brightness and the color of the second color light-emitting unit according to the second dimming control signal;
the third driving circuit is used for receiving a third dimming control signal and adjusting the brightness and the color of the third color light-emitting unit according to the third dimming control signal;
the circuit structures of the first driving circuit, the second driving circuit and the third driving circuit are identical.
7. The automatic dimming circuit of claim 6, wherein the first driving circuit comprises: the first switch tube, the second switch tube, the third resistor and the fourth resistor;
the control end of the first switching tube is electrically connected with the first output end of the dimming control unit through the third resistor, the input end of the first switching tube is electrically connected with the first color light-emitting unit, and the output end of the first switching tube is grounded through the fourth resistor;
the control end of the second switching tube is electrically connected with the output end of the first switching tube, the input end of the second switching tube is electrically connected with the control end of the first switching tube, and the output end of the second switching tube is grounded.
8. The automatic dimming circuit of any one of claims 1-7, wherein the dimming control unit is provided with at least two input interfaces and at least three output interfaces;
the input interface is used for receiving the ambient light detection signal or the human body detection signal;
the output interface is used for outputting any one path of dimming control signal.
9. The automatic dimming circuit of any one of claims 1-7, wherein the signal acquisition unit comprises: the photosensitive detector is used for acquiring the ambient light detection signal, and the pyroelectric sensor is used for acquiring the human body detection signal.
10. A lighting device, the lighting device comprising: at least one set of lighting units, and an automatic dimming circuit according to any one of claims 1 to 9, for adjusting the brightness and color of the lighting units according to an ambient light detection signal and a human detection signal of an illumination area.
CN202310396317.0A 2023-04-13 2023-04-13 Lighting device and automatic dimming circuit for same Pending CN116367393A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310396317.0A CN116367393A (en) 2023-04-13 2023-04-13 Lighting device and automatic dimming circuit for same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310396317.0A CN116367393A (en) 2023-04-13 2023-04-13 Lighting device and automatic dimming circuit for same

Publications (1)

Publication Number Publication Date
CN116367393A true CN116367393A (en) 2023-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310396317.0A Pending CN116367393A (en) 2023-04-13 2023-04-13 Lighting device and automatic dimming circuit for same

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Country Link
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