CN114430598B - LED light sense lamp control circuit and LED lamp - Google Patents

LED light sense lamp control circuit and LED lamp Download PDF

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Publication number
CN114430598B
CN114430598B CN202111616159.2A CN202111616159A CN114430598B CN 114430598 B CN114430598 B CN 114430598B CN 202111616159 A CN202111616159 A CN 202111616159A CN 114430598 B CN114430598 B CN 114430598B
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module
resistor
sampling
unit
current
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CN114430598A (en
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张良良
朱奕光
魏彬
陈丹纯
黄付果
谢姜
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Foshan Electrical and Lighting Co Ltd
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Foshan Electrical and Lighting Co Ltd
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Priority to CN202111616159.2A priority Critical patent/CN114430598B/en
Priority to PCT/CN2022/090409 priority patent/WO2023123781A1/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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback
    • 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
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • 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
    • H05B45/345—Current stabilisation; Maintaining constant current
    • 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 application provides a LED light sense lamp accuse circuit and LED lamp relates to the lighting technology field, and its technical scheme main points are: the method comprises the following steps: the constant current driving circuit comprises a driving control module and a sampling module, and the light sensing control circuit comprises an induction module, a detection module and a feedback module; the driving control module converts external alternating current into direct current and outputs the direct current to the LED load; the sampling module is used for acquiring real-time current information or real-time voltage information of the LED load; the sensing module is used for collecting environmental illumination information to generate a control signal and sending the control signal to the driving control module; the detection module is used for generating an adjusting signal according to the real-time current information or the real-time voltage information and sending the adjusting signal to the feedback module; the feedback module is used for adjusting the control signal generated by the induction module according to the adjusting signal. The application provides a pair of LED light sense lamp control circuit and LED lamps and lanterns have accurate stable realization lighting control's advantage.

Description

LED light sense lamp control circuit and LED lamp
Technical Field
The application relates to the technical field of lighting, particularly, relates to an LED light sense lamp accuse circuit and LED lamp.
Background
With the development of modern science and technology and the high-speed development of lighting intelligent technology, the intelligent LED lighting gradually becomes the mainstream of future lighting. The LED is far superior to the traditional illuminating product in the aspects of technology, power consumption, energy conservation, availability and environmental protection. However, most of the LED lamps in the market belong to a conventional series, and are mainly used for providing a conventional lighting function, and the LED lamps have a single function and cannot meet the requirement of intelligence.
At present, there is a light sensation illumination scheme in the market that controls through detecting ambient light, but it can receive the influence of self light source when detecting ambient light, consequently can't accurate stable realization lighting control.
In view of the above problems, the applicant has proposed a new solution.
Disclosure of Invention
The utility model provides a purpose provides a LED light sense lamp accuse circuit and LED lamp has accurate stable realization lighting control's advantage.
First aspect, this application provides a LED light sense lamp accuse circuit, and technical scheme is as follows:
the method comprises the following steps: the constant current driving circuit comprises a driving control module and a sampling module, and the light sensing control circuit comprises an induction module, a detection module and a feedback module;
the drive control module is used for converting external alternating current into direct current and outputting the direct current to the LED load;
the sampling module is used for acquiring real-time current information or real-time voltage information of the LED load;
the sensing module is used for collecting environmental illumination information, generating a control signal according to the environmental illumination information and sending the control signal to the driving control module so that the driving control module controls the direct current output to the LED load according to the control signal;
the detection module is used for generating an adjusting signal according to the real-time current information or the real-time voltage information and sending the adjusting signal to the feedback module;
and the feedback module is used for adjusting the control signal generated by the induction module according to the adjusting signal.
The sensing module is used for detecting the ambient illumination information, so that the driving control module controls the current output to the LED load, the sampling module is used for collecting the real-time current or the real-time voltage of the LED load in the process, the detection module generates an adjusting signal and generates the adjusting signal to the feedback module, and the feedback module enables the sensing module to adjust the control effect of the driving control module according to the adjusting signal, so that the beneficial effect of accurately and stably realizing illumination control is achieved.
Further, in the present application, the feedback module includes at least two feedback branches;
the feedback module is configured to switch on the corresponding feedback branch according to the adjustment signal, so that the switched-on feedback branch is communicated with the sensing module, thereby adjusting the control signal generated by the sensing module.
Further, in this application, at least two feedback branch roads include first feedback branch road and second feedback branch road, first feedback branch road includes first switch tube, second feedback branch road includes eighth resistance, eighth resistance coupling is in between the input and the output of first switch tube, the input of first switch tube with the output of response module is connected, the output ground connection of first switch tube, the control end of first switch tube with the output of detection module is connected.
Further, in the present application, the driving control module includes a rectifying and filtering unit and a constant current control unit, where the rectifying and filtering unit is configured to convert an external alternating current into a direct current and respectively provide the direct current for the constant current control unit and the LED load; the constant current control unit is used for controlling the direct current flowing through the LED load according to the control signal.
Further, in the present application, the sampling module is configured to collect real-time current information of the LED load, the sampling module includes at least one first sampling resistor, one end of the first sampling resistor is configured to be connected to a current sampling end of the constant current control unit and an input end of the detection module, and the other end of the first sampling resistor is grounded;
or, the sampling module is used for gathering the real-time voltage information of LED load, the sampling module includes second sampling resistance, third sampling resistance and fourth sampling resistance, the second sampling resistance is connected between the positive negative pole of LED load, the one end of third sampling resistance is connected the negative pole of LED load, the other end of third sampling resistance passes through fourth sampling resistance ground connection, the other end of third sampling resistance still with detection module's input is connected.
Further, in the present application, the detection module includes an information detection unit and a switch unit;
the information detection unit is used for detecting the real-time current information or the real-time voltage information of the LED load, which is acquired by the sampling module;
and the switch unit is used for controlling the on-off of the switch unit according to the real-time current information or the real-time voltage information so as to generate a corresponding adjusting signal and output the adjusting signal to the feedback module.
Further, in this application, the switch unit includes a second switch tube, an input end of the second switch tube is connected to an output end of the rectification filter unit or an input end of the second switch tube is connected to an output end of the rectification filter unit through the sensing module, and an output end of the second switch tube is grounded;
the information detection unit comprises a sixth resistor and a seventh resistor, one end of the sixth resistor is connected with the control signal input end of the constant current control unit, the other end of the sixth resistor is connected with the output end of the sampling module through the seventh resistor, and the other end of the sixth resistor is also connected with the control end of the second switch tube; or the like, or a combination thereof,
the information detection unit comprises a sixth resistor and a first diode, one end of the sixth resistor is connected with a control signal input end of the constant current control unit, the other end of the sixth resistor is connected with an anode of the first diode and a control end of the second switch tube respectively, and a cathode of the first diode is connected with an output end of the sampling module.
Further, in this application, the response module includes the starter unit, filtering unit and photosensitive unit, the output of rectification filtering unit passes through the starter unit respectively with photosensitive unit's input, filtering unit's one end with constant current control unit's control signal input end is connected, filtering unit's the other end ground connection, photosensitive unit's output passes through feedback module ground connection.
Further, in this application, the starting unit includes a first voltage dividing resistor set, a second voltage dividing resistor set and a first current limiting resistor, the filtering unit includes a first capacitor, and the photosensitive unit includes a photosensitive element;
the output end of the rectification filter unit is respectively connected with one end of the second divider resistor group and one end of the first current-limiting resistor through the first divider resistor group, the other end of the second divider resistor group is grounded or the other end of the second divider resistor group is grounded through the detection module, the other end of the first current-limiting resistor is respectively connected with the input end of the photosensitive element and the control signal input end of the constant current control unit, the other end of the first current-limiting resistor is grounded through the first capacitor, and the output end of the photosensitive element is grounded through the feedback module.
In a second aspect, the present application further provides an LED lamp, wherein the LED light sensing lamp control circuit is provided in the LED lamp.
By last knowing, the utility model provides a LED light sense lamp accuse circuit and LED lamp, thereby utilize response module detection environment illumination information to make the electric current of drive control module control output to the LED load, at this in-process, utilize the real-time electric current or the real-time voltage of sampling module collection LED load, thereby make detection module generate the accommodate signal and take place for feedback module, feedback module makes the control effect that response module adjusted drive control module according to accommodate signal, consequently, have accurate stable realization lighting control's beneficial effect.
Additional features and advantages of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the present application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a circuit diagram of an LED light sense lamp provided in the present application.
Fig. 2 is a circuit diagram of an LED light sensor lamp according to an embodiment of the present disclosure.
Fig. 3 is a circuit diagram of an LED light sensor lamp according to an embodiment of the present disclosure.
Fig. 4 is a circuit diagram of an LED light sensor lamp according to an embodiment of the present disclosure.
Fig. 5 is a circuit diagram of an LED light sensor lamp according to an embodiment of the present disclosure.
Fig. 6 is a circuit diagram of an LED light sensor lamp according to an embodiment of the present disclosure.
In the figure: 100. a constant current drive circuit; 200. a light sensing control circuit; 300. an LED load; 110. a drive control module; 120. a sampling module; 111. a rectification filter unit; 112. a constant current control unit; 210. a sensing module; 220. a detection module; 230. and a feedback module.
Detailed Description
The technical solutions in the present application will be described clearly and completely with reference to the drawings in the present application, and it should be apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the present application, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1 to 6, the present application provides an LED light sensing lamp control circuit, which specifically includes:
the constant current driving circuit 100 comprises a driving control module 110 and a sampling module 120, and the light sensing control circuit 200 comprises a sensing module 210, a detection module 220 and a feedback module 230;
the driving control module 110 is configured to convert an external ac power into a dc power and output the dc power to the LED load 300;
the sampling module 120 is configured to collect real-time current information or real-time voltage information of the LED load 300;
the sensing module 210 is configured to collect the ambient light information, generate a control signal according to the ambient light information, and send the control signal to the driving control module 110, so that the driving control module 110 controls the direct current output to the LED load 300 according to the control signal;
the detection module 220 is configured to generate an adjustment signal according to the real-time current information or the real-time voltage information, and send the adjustment signal to the feedback module 230;
and a feedback module 230 for adjusting the control signal generated by the sensing module 210 according to the adjustment signal.
Through the above technical solution, the sensing module 210 is used to detect the ambient illumination information, so that the driving control module 110 controls the current output to the LED load 300, in this process, the sampling module 120 is used to collect the real-time current or real-time voltage of the LED load 300, so that the detection module 220 generates the adjustment signal and sends the adjustment signal to the feedback module 230, and the feedback module 230 enables the sensing module 210 to adjust the control effect of the driving control module 110 according to the adjustment signal, thereby having the beneficial effect of accurately and stably implementing the lighting control.
Further, as shown in fig. 2, in some embodiments, the feedback module 230 includes at least two feedback branches;
the feedback module 230 is configured to turn on a corresponding feedback branch according to the adjustment signal, so that the turned-on feedback branch is communicated with the sensing module 210, and thus the control signal generated by the sensing module 210 is adjusted; the total resistance value of the feedback branch circuit which is correspondingly conducted by each adjusting signal is different.
Through the above technical solution, the feedback module 230 turns on the corresponding feedback branch according to the adjustment signal of the detection module 220, so that the turned on feedback branch in the feedback module 230 is connected to the sensing module 210; because the total resistance of the feedback branch that each kind of adjustment signal correspondingly switches on is different, under the condition of different adjustment signals, the voltage drop formed on the branch formed by the sensing module 210 and the switched-on feedback branch is different, and then the sensing module 210 generates different control signals to enable the driving control module 110 to control the current output to the LED load 300, thereby realizing different brightness adjustments.
In some embodiments, it is preferable that each feedback branch has a different resistance.
Further, as shown in fig. 2, in some embodiments, the at least two feedback branches include a first feedback branch and a second feedback branch, the first feedback branch includes a first switching tube Q2, the second feedback branch includes an eighth resistor R8, the eighth resistor R8 is connected between an input end and an output end of the first switching tube Q2, the input end of the first switching tube Q2 is connected to the output end of the sensing module 210, the output end of the first switching tube Q2 is grounded, and a control end of the first switching tube Q2 is connected to the output end of the detecting module 220;
specifically, the feedback module 230 includes a first switching tube Q2 and an eighth resistor R8, where the first switching tube Q2 may be a triode, the eighth resistor R8 is connected between a collector and an emitter of the triode, that is, the eighth resistor R8 is connected in parallel with the triode, the collector of the triode is connected with the sensing module 210, the base of the triode is connected with the detection module 220, and the emitter of the triode is grounded;
the current flows to the ground through the sensing module 210 and the first switch tube Q2, and the first switch tube Q2 forms one of the feedback branches;
the current flows to the ground through the sensing module 210 and the eighth resistor R8, and the eighth resistor R8 forms another feedback branch.
In addition, it should be noted that the type of the first switching tube Q2 may be set according to actual use requirements, for example, the first switching tube Q2 may be set as a triode or a MOS transistor, and this embodiment does not limit this. Preferably, the first switching transistor Q2 is an NPN type transistor, as shown in fig. 2; alternatively, the first switch Q2 is an NMOS transistor, as shown in fig. 3.
Further, in some of the embodiments, the detection module 220 includes an information detection unit and a switch unit; the information detection unit is used for detecting the real-time current information or the real-time voltage information of the LED load 300 collected by the sampling module 120; and the switching unit is configured to control on and off of the switching unit according to the real-time current information or the real-time voltage information to generate a corresponding adjustment signal, and output the adjustment signal to the feedback module 230.
Specifically, as shown in fig. 1 and 2, the switching unit includes a second switching tube Q1, an input end of the second switching tube Q1 is connected to an output end of the rectification and filtering unit 111, or an input end of the second switching tube Q1 is connected to an output end of the rectification and filtering unit through the sensing module, and an output end of the second switching tube Q1 is grounded;
the information detection unit includes a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is connected to the control signal input end of the constant current control unit 112, the other end of the sixth resistor R6 is connected to the output end of the sampling module 120 through the seventh resistor R7, and the other end of the sixth resistor R6 is further connected to the control end of the second switching tube Q1, as shown in fig. 2 and 3;
in other embodiments, the information detection unit includes a sixth resistor R6 and a first diode D1, one end of the sixth resistor R6 is connected to the control signal input end of the constant current control unit 112, the other end of the sixth resistor R6 is respectively connected to the anode of the first diode D1 and the control end of the second switch tube Q1, and the cathode of the first diode D1 is connected to the output end of the sampling module 120, as shown in fig. 5.
The second switch Q1 may be a transistor.
That is, the detection module 220 includes a triode and a seventh resistor R7, and may also include a sixth resistor R6, a collector of the triode is connected to the first switch Q2, an emitter of the triode is grounded, a base of the triode is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the sampling module 120.
Through the above technical solution, when the sampling module 120 collects a small current flowing through the LED load 300, the current flowing through the seventh resistor R7 does not exceed the threshold, and at this time, the first triode is not turned on, and because the first triode is not turned on, the current output from the rectifier bridge DB1 flows through the first resistor R1 and the second resistor R2, and then flows through the resistor R3 from the resistor R2, so that the first switch tube Q2 is turned on, and at this time, the current flows through the sensing module 210 and the first switch tube Q2, and finally is grounded to form a loop. When the sampling module 120 collects a large current flowing through the LED load 300, the current flowing through the seventh resistor R7 exceeds a threshold, and at this time, the triode is turned on, and since the triode is turned on, the current output from the rectifier bridge DB1 sequentially flows through the first resistor R1, the second resistor R2, the third resistor R3, and the triode to the ground, and the level of the control end of the first switching tube Q2 is lowered, so that the first switching tube Q2 is disconnected, and thus the current flows through the sensing module 210 and the eighth resistor R8, and finally, the ground forms a loop. Since the two feedback branches have different resistances, the sensing module 210 generates different control signals, and the driving control module 110 controls the dc power output to the LED load 300 according to the control signals.
In addition, it should be noted that the type of the second switching tube Q1 may be set according to the actual use requirement, for example, it may be set as a triode or a MOS transistor, and this embodiment does not limit this. Preferably, the second switching tube Q1 is an NPN type transistor, as shown in fig. 2; alternatively, the second switch tube Q1 is an NMOS tube, as shown in fig. 3.
Further, as shown in fig. 1 and fig. 2, in some embodiments, the driving control module 110 includes a rectifying and filtering unit 111 and a constant current control unit 112, wherein the rectifying and filtering unit 111 is used for converting an external alternating current into a direct current, and the constant current control unit 112 is used for controlling the direct current flowing through the LED load 300.
Specifically, the rectifying and filtering unit 111 includes a rectifying bridge DB1 and a filtering capacitor CE1, a forward input end of the rectifying bridge DB1 is connected to the live wire, a reverse input end is connected to the zero line, a reverse output end is grounded, and a forward output end is connected to the anode of the LED load 300, one end of the filtering capacitor CE1 is connected between the rectifying bridge DB1 and the LED load 300, and the other end is grounded.
Through the technical scheme, the rectifier bridge DB1 is composed of four diodes, and converts alternating current into direct current through the unidirectional conduction characteristics of the diodes and outputs the direct current to the LED load 300, so that the LED load 300 can stably operate under the direct current and can supply power to the constant current control unit 112.
Further, in some embodiments, a fuse may be disposed on the live line connected to the rectifier bridge DB1, and the fuse may be a fuse, or other fusing device. The safety device has a protection effect on the whole circuit, and the damage of components caused by overlarge circuit load is prevented. As shown in fig. 2, the fuse device may use a fuse resistor RF1.
Further, in some of the embodiments, the constant current control unit 112 includes a linear constant current driving chip U1 or a switching power supply chip U3.
Through the technical scheme, the linear constant current driving chip U1 or the switching power supply chip U3 is a commonly used control chip in the current market, and can stably and effectively control the input current of the LED load 300.
Specifically, in some embodiments, the constant current control unit 112 includes a linear constant current driving chip U1, which is a chip for driving and controlling LEDs, the linear constant current driving chip U1 has a plurality of connection ports, which are a power-taking port VIN, a driving port LED, a ground port GND, a dimming port DIM, and a current sampling port RCS, respectively, as shown in fig. 2, the driving port LED of the linear constant current driving chip U1 is used for connecting a negative electrode of the LED load 300, the ground port GND is used for grounding, and the dimming port DIM is used for connecting an input end of the sensing module 210; the power taking port VIN is connected with the forward output end of the rectifier bridge DB1, so that the linear constant current driving chip U1 is powered through the rectifier bridge DB 1.
Through the connection mode, the linear constant current driving chip U1 can not only stabilize the current flowing through the LED load 300, but also control the current flowing through the LED load 300, so as to control the brightness of the illumination of the LED load 300.
Preferably, the constant current control unit 112 further includes a first current-limiting protection subunit, and the power-taking port VIN of the linear constant current driving chip U1 is connected to the output end of the rectifying and filtering unit 111 through the first current-limiting protection subunit.
Specifically, the first current-limiting protection subunit includes a ninth resistor R9, and the ninth resistor R9 is further disposed between the VIN interface of the linear constant-current driving chip U1 and the anode of the LED load 300, so as to perform a current-limiting protection function.
In some embodiments, the constant current control unit 112 further includes a second current-limiting protection subunit, and the dimming port DIM of the linear constant current driving chip U1 is connected to the input terminal of the sensing module 210 through the second current-limiting protection subunit.
Specifically, the second current-limiting protection subunit includes a fifth resistor R5, where the fifth resistor R5 is disposed between the DIM interface of the linear constant-current driving chip U1 and the sensing module 210, and performs current limiting through the fifth resistor R5, so as to protect the DIM interface of the linear constant-current driving chip U1.
Further, in some embodiments, the sampling module 120 is configured to collect real-time current information of the LED load 300, and the sampling module 120 includes at least one first sampling resistor, one end of the first sampling resistor is connected to the constant current control unit 112, and the other end of the first sampling resistor is grounded.
Through the above technical solution, the sampling module 120 is configured to obtain the current or voltage flowing through the LED load 300, and the purpose of the sampling module is to obtain the current or voltage flowing through the LED load 300, so that the subsequent driving control module 110 can conveniently regulate and control the lighting state of the LED load 300.
Specifically, as shown in fig. 2, when the sampling module 120 is configured to collect a current flowing through the LED load 300, the sampling module 120 includes two first sampling resistors RS1 and RS2 connected in parallel, one end of each of the first sampling resistor RS1 and the first sampling resistor RS2 can be connected to the RCS interface of the linear constant current driving chip U1, and the other end of each of the first sampling resistor RS1 and the other end of the first sampling resistor RS2 are grounded, so that the current flowing through the LED load 300 can be collected. The number of the first sampling resistors is set according to actual conditions, and may be one or more. In this embodiment, the first sampling resistor RS1 is a conventional arrangement of the linear constant current driving chip U1, the linear constant current driving chip U1 needs to use the current signal for operation, and the scheme of this embodiment is to use the characteristic of the linear constant current driving chip U1, so that it is not necessary to additionally increase the current for collecting the current.
Further, as shown in fig. 4, in some other embodiments, the sampling module 120 is configured to collect real-time voltage information of the LED load 300, where the sampling module 120 includes a second sampling resistor R4, a third sampling resistor R7, and a fourth sampling resistor R6, the second sampling resistor R4 is connected between the positive electrode and the negative electrode of the LED load 300, one end of the third sampling resistor R7 is connected to the negative electrode of the LED load 300, the other end of the third sampling resistor R7 is grounded through the fourth sampling resistor R6, and the other end of the third sampling resistor R7 is further connected to the input end of the detection module 220.
Through the above technical scheme, the one end of the second sampling resistor R4 is connected at the positive pole of the LED load 300, the other end is connected at the negative pole of the LED load 300, one end of the third sampling resistor R7 is connected with the negative pole of the LED load 300, the other end is connected with the fourth sampling resistor R6, the other end of the fourth sampling resistor R6 is grounded, and the feedback module 230 is connected between the fourth sampling resistor R6 and the third sampling resistor R7. In this embodiment, the second sampling resistor R4, the third sampling resistor R7 and the fourth sampling resistor R6 are arranged to collect the voltage difference between the negative terminal of the LED load 300 and the line reference ground, so as to obtain the real-time voltage information of the LED load 300.
In addition, it should be noted that the sampling module 120 may further acquire the voltage across the LED load by setting a sampling resistor, so as to obtain the real-time voltage information of the LED load 300.
In the two embodiments, two schemes of acquiring the real-time current information of the LED load 300 and acquiring the real-time voltage information of the LED load 300 by the sampling module 120 are included, and the purpose is to obtain the working state of the LED load 300, so that the detection module 220 generates the adjustment signal, and sends the adjustment signal to the feedback module 230, so that the sensing module 210 adjusts the control effect of the driving control module 110, and thus the accurate regulation and control of the lighting of the LED load 300 is realized.
Further, as shown in fig. 2, in some embodiments, the sensing module 210 includes a starting unit, a filtering unit and a photosensitive unit, an output terminal of the rectifying and filtering unit 111 is connected to an input terminal of the photosensitive unit, one end of the filtering unit and a control signal input terminal of the constant current control unit 112 through the starting unit, the other end of the filtering unit is grounded, and an output terminal of the photosensitive unit is grounded through the feedback module 230.
Further, the starting unit comprises a first voltage-dividing resistor group, a second voltage-dividing resistor group and a first current-limiting resistor R4, the filtering unit comprises a first capacitor C1, and the photosensitive unit comprises a photosensitive element P1;
the output end of the rectifying and filtering unit 111 is connected to one end of the second voltage-dividing resistor group and one end of the first current-limiting resistor R4 through the first voltage-dividing resistor group, the other end of the second voltage-dividing resistor group is grounded or the other end of the second voltage-dividing resistor group is grounded through the detection module 220, the other end of the first current-limiting resistor R4 is connected to the input end of the photosensitive element P1 and the control signal input end of the constant current control unit 112, the other end of the first current-limiting resistor R4 is grounded through the first capacitor C1, and the output end of the photosensitive element P1 is grounded through the feedback module 230.
Further, the first group of voltage-dividing resistors comprises at least one first voltage-dividing resistor; when the first voltage-dividing resistor group includes a plurality of first voltage-dividing resistors, the plurality of first voltage-dividing resistors are connected in series. Preferably, the first group of voltage dividing resistors comprises two first voltage dividing resistors (R1, R2) connected in series, as shown in fig. 2.
The second voltage-dividing resistor group comprises at least one second voltage-dividing resistor; when the second voltage-dividing resistor group comprises a plurality of second voltage-dividing resistors, the plurality of second voltage-dividing resistors are connected in series. Preferably, the second voltage-dividing resistor group comprises a second voltage-dividing resistor R3, as shown in fig. 2.
In addition, it should be noted that the other end of the second voltage dividing resistor group is grounded through the detection module 220, specifically: the other end of the second voltage-dividing resistor group is connected to the input end of the second switch tube Q1, as shown in fig. 2.
In addition, as shown in fig. 3, in some other embodiments, the sensing module 210 further includes a zener diode ZD1, a cathode of the zener diode ZD1 is connected to the other end of the first voltage dividing resistor group, and an anode of the zener diode ZD1 is grounded; the voltage stabilizing diode ZD1 can play a role of voltage stabilization.
Specifically, as shown in fig. 3, the cathode of the zener diode ZD1 is connected to the intersection of the first voltage dividing resistor R2, the first current limiting resistor R4, and the second voltage dividing resistor R3, and the anode of the zener diode ZD1 is grounded.
Preferably, the photosensitive element P1 may be a photodiode with a wavelength in the near infrared band of 780nm to 3000nm, a phototransistor, or a photosensitive device with other spectra and a near infrared filter, such as a common photoresistor and a filter. By adopting the photosensitive element, artificial light and natural light can be further effectively distinguished, and the influence of the artificial light on the control of the LED load brightness is avoided, so that the accurate control of the LED load brightness is further ensured.
In summary, as shown in fig. 2, the rectifier bridge DB1 receives ac power, converts the ac power into dc power, and outputs the dc power to the LED load 300, the current flows through the LED load 300 and then flows into the linear constant current driving chip U1, and a closed loop is formed by the linear constant current driving chip U1, so that the LED load 300 normally operates, on the basis, two sampling resistors RS1 and RS2 arranged in parallel are connected to the RCS interface of the linear constant current driving chip U1, and the RCS interface is further connected to the base of the second switching tube Q1 through a seventh resistor R7, when the detection module 220 detects that the voltage of the sampling module 120 is less than a threshold, the second switching tube Q1 is turned off, when the second switching tube Q1 is turned off, the dc power output from the rectifier bridge DB1 sequentially passes through the first voltage dividing resistor R1, the second voltage dividing resistor R2, and the third voltage resistor R3, and then reaches the base of the first switching tube Q2, so that the first switching tube Q2 is turned on, and at this time, the eighth resistor R8 connected in parallel with the first switching tube Q2 is short-circuited, the current flowing out from the photosensitive element P1, flows through the first switching tube P2, and then flows to the first switching tube P2, so that the first switching tube Q2, and the illumination signal of the linear constant current collecting module 300 changes, so that the photosensitive element changes, and the photosensitive element, so that the illumination of the linear constant current collecting chip 300 changes, and the photosensitive element changes, and the photosensitive element changes accordingly, and the photosensitive element, so that the photosensitive element changes. When the detection module 220 detects that the voltage of the sampling module 120 is greater than the threshold, the second switching tube Q1 is turned on, and at this time, the direct current output from the rectifier bridge DB1 sequentially passes through the first voltage dividing resistor R1, the second voltage dividing resistor R2, the third voltage dividing resistor R3, and the second switching tube Q1 and flows to the ground, and the level of the base of the first switching tube Q2 is lowered, so that the first switching tube Q2 is turned off, and at this time, the current flowing out from the photosensitive element P1 flows to the ground through the eighth resistor R8, and a second voltage drop is formed on a branch formed by the photosensitive element P1 and the eighth resistor R8, and when the ambient illumination collected by the photosensitive element P1 changes, the current flowing through the photosensitive element P1 changes, so that the second voltage drop changes, and a corresponding control signal is generated and input to the DIM interface, so that the linear constant current driving chip U1 controls the current flowing through the LED load 300 according to control the brightness of the LED load 300. It should be noted that, when the current flowing through the first branch and the current flowing through the second branch are the same, the first voltage drop is smaller than the second voltage drop.
The application provides a LED light sense lamp control circuit, not only can acquire environment illumination intensity through the induction module 210, realize brightness control according to environment illumination intensity, the innovative sampling module 120 that has added, detection module 220 and feedback module 230, gather the electric current or the voltage that flows through LED load 300 through sampling module 120, obtain the signal of gathering, detection module 220 obtains the status signal of LED load 300 through gathering the signal, then through the state of detection module 220 control feedback module 230, induction module 210 is then according to the status adjustment control signal of feedback module 230, with control signal input to drive control module 110 in, and then control the light and dark degree of LED load 300 by drive control module 110. Therefore, the LED load 300 can be automatically adjusted through the ambient illumination information, artificial light and natural light can be distinguished and checked, the natural illumination state of a space can be accurately reflected, a lamp control strategy is implemented, and the problems that an existing light sensation illumination product is easily influenced by other LED illuminating lamps and flashes under certain brightness threshold values can be well solved.
As shown in fig. 4, in a scheme of using the sampling module 120 to collect the voltage of the LED load 300, the sensing module 210 includes a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1, a photosensitive element P1, and a zener diode ZD1, one end of the first resistor R1 is connected to the output end of the rectifying and filtering unit, the other end of the first resistor R2 is connected to the negative electrode of the zener diode ZD1 through the second resistor R2, and the positive electrode of the zener diode ZD1 is grounded. The base of the first switch tube Q2 in the feedback module 230 is connected between the seventh resistor R7 and the sixth resistor R6, the collector of the first switch tube Q2 is connected to one end of the photosensitive element P1, the emitter of the first switch tube Q2 is grounded, and the eighth resistor R8 is connected in parallel with the first switch tube Q2. In this scheme, the base of the first switching tube Q2 is used to detect the cathode voltage of the LED load 300, and then the voltage difference with the line reference ground is used to realize the feedback regulation of the LED load 300. In this scenario, the feedback module 230 replaces the detection module 220.
In other embodiments, as shown in fig. 5, a first diode D1 may be used instead of the seventh resistor R7, and one end of the sixth resistor R6 is connected between the first diode D1 and the transistor, and the other end is connected between the fifth resistor R5 and the DIM interface of the linear constant current driving chip U1.
Further, as shown in fig. 6, in some embodiments, the constant current control unit 112 employs a switching power supply chip U3.
Through the technical scheme, the switching power supply chip U3 is used for controlling the current flowing through the LED load 300.
The current structure of the switching power supply chip U3 adopted by the constant current control unit 112 is basically the same as the circuit structure of the linear constant current driving chip U1, and the differences mainly lie in that:
the positive output end of the rectifier bridge DB1 is connected with the HV interface of the switching power supply chip U3 through a ninth resistor R9, so that power is supplied to the switching power supply chip U3; the rectifier bridge DB1 outputs direct current to the anode of the LED load 300, and the direct current flows out from the cathode of the LED load 300, flows into the DRAIN interface of the switching power supply chip U3 through the inductor L1, and then is grounded through the GND interface of the switching power supply chip U3 to form a closed loop, so that the LED load 300 can normally operate under stable direct current.
Specifically, an inductor L1, a diode D6, a capacitor CE4 and a resistor R20 are connected between the switching power supply chip U3 and the LED load 300, one end of the inductor L1 is connected to the negative electrode of the LED load 300, and the other end is connected to a DRAIN interface of the switching power supply chip U3; the cathode of the diode D6 is connected with the anode of the LED load 300, and the anode of the diode D6 is connected with the DRAIN interface of the switching power supply chip U3; the positive electrode of the capacitor CE4 is connected to the positive electrode of the LED load 300, and the negative electrode of the capacitor CE4 is connected to the negative electrode of the LED load 300. One end of the capacitor C14 is connected to the cathode of the LED load 300, and the other end is grounded. The resistor R20, the capacitor CE4 and the capacitor C14 are used for effectively filtering circuit ripples and improving system stability; specifically, the capacitor CE4 prevents voltage transformation, absorbs overvoltage in a spike state, and the resistor R20 absorbs electric energy of the capacitor, so as to prevent the discharge current of the capacitor from being too large to damage the LED load 300 connected in parallel therewith.
And a CS interface of the switching power supply chip U3 is connected with a sampling resistor RS1, one end of the sampling resistor RS1 is connected with the CS interface, and the other end of the sampling resistor RS1 is grounded. A diode D1 is connected between the CS interface and the sampling resistor RS1, the cathode of the diode D1 is connected to the CS interface, the anode of the diode D1 is connected with one end of a seventh resistor, the other end of the seventh resistor is connected with the base electrode of the triode, one end of a capacitor C2 is connected to the anode of the diode D1, and the other end of the capacitor C2 is grounded. In addition, a resistor R18 is connected to the ROVP interface of the switching power supply chip U3, one end of the resistor R18 is connected to the ROVP interface, and the other end is grounded. The control signal generated by the photodiode P1 is input to the PWM interface of the switching power supply chip U3, and the layout and wiring manner of other circuit components is as shown in the figure, which is the same as the circuit structure of the linear constant current driving chip U1, and is not described herein again.
The application also provides an LED lamp, is provided with foretell LED light sense lamp accuse circuit in the LED lamp.
Through above-mentioned technical scheme, use the foretell LED light sense lamp accuse circuit of this application in the LED lamp to make the LED lamp realize automatically regulated according to environment illumination information, and can distinguish inspection artificial light and natural light, can accurately reflect the natural illumination state in space, and then implement the lamp accuse strategy.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (5)

1. The utility model provides a LED light sense lamp accuse circuit which characterized in that includes: the constant current driving circuit (100) comprises a driving control module (110) and a sampling module (120), and the light sensation control circuit (200) comprises an induction module (210), a detection module (220) and a feedback module (230);
the drive control module (110) is used for converting external alternating current into direct current and outputting the direct current to the LED load (300);
the sampling module (120) is used for acquiring real-time current information or real-time voltage information of the LED load (300);
the sensing module (210) is configured to collect ambient illumination information, generate a control signal according to the ambient illumination information, and send the control signal to the driving control module (110), so that the driving control module (110) controls the direct current output to the LED load (300) according to the control signal;
the detection module (220) is used for generating a regulating signal according to the real-time current information or the real-time voltage information and sending the regulating signal to the feedback module (230);
the feedback module (230) is used for adjusting the control signal generated by the sensing module (210) according to the adjusting signal;
the feedback module (230) comprises at least two feedback branches;
the feedback module (230) is configured to switch on the corresponding feedback branch according to the adjustment signal, so that the switched-on feedback branch is communicated with the sensing module (210), and thus the control signal generated by the sensing module (210) is adjusted;
the at least two feedback branches comprise a first feedback branch and a second feedback branch, the first feedback branch comprises a first switch tube, the second feedback branch comprises an eighth resistor, the eighth resistor is connected between the input end and the output end of the first switch tube, the input end of the first switch tube is connected with the output end of the induction module (210), the output end of the first switch tube is grounded, and the control end of the first switch tube is connected with the output end of the detection module (220);
the driving control module (110) comprises a rectifying and filtering unit (111) and a constant current control unit (112), wherein the rectifying and filtering unit (111) is used for converting external alternating current into direct current and respectively providing the direct current for the constant current control unit (112) and the LED load (300); the constant current control unit (112) is used for controlling direct current flowing through the LED load (300) according to the control signal;
the detection module (220) comprises an information detection unit and a switch unit;
the information detection unit is used for detecting real-time current information or real-time voltage information of the LED load (300) collected by the sampling module (120);
the switch unit is used for controlling the on-off of the switch unit according to the real-time current information or the real-time voltage information so as to generate a corresponding adjusting signal and output the adjusting signal to the feedback module (230);
the switch unit comprises a second switch tube, the input end of the second switch tube is connected with the output end of the rectification filter unit (111) or the input end of the second switch tube is connected with the output end of the rectification filter unit (111) through the induction module (210), and the output end of the second switch tube is grounded;
the information detection unit comprises a sixth resistor and a seventh resistor, one end of the sixth resistor is connected with a control signal input end of the constant current control unit (112), the other end of the sixth resistor is connected with an output end of the sampling module (120) through the seventh resistor, and the other end of the sixth resistor is also connected with a control end of the second switch tube; or the like, or, alternatively,
the information detection unit comprises a sixth resistor and a first diode, one end of the sixth resistor is connected with a control signal input end of the constant current control unit (112), the other end of the sixth resistor is connected with the anode of the first diode and the control end of the second switch tube respectively, and the cathode of the first diode is connected with the output end of the sampling module (120).
2. The LED light sensation lamp control circuit according to claim 1, wherein the sampling module (120) is used for collecting real-time current information of the LED load (300), the sampling module (120) comprises at least one first sampling resistor, one end of the first sampling resistor is used for being connected with a current sampling end of the constant current control unit (112) and an input end of the detection module (220), and the other end of the first sampling resistor is grounded;
or, sampling module (120) is used for gathering the real-time voltage information of LED load (300), sampling module (120) includes second sampling resistance, third sampling resistance and fourth sampling resistance, the second sampling resistance is connected between the positive negative pole of LED load (300), the one end of third sampling resistance is connected the negative pole of LED load (300), the other end of third sampling resistance passes through fourth sampling resistance ground connection, the other end of third sampling resistance still with the input of detection module (220) is connected.
3. The LED light sense lamp control circuit according to claim 1, wherein the sensing module (210) comprises a starting unit, a filtering unit and a photosensitive unit, the output end of the rectifying and filtering unit (111) is respectively connected with the input end of the photosensitive unit, one end of the filtering unit and the control signal input end of the constant current control unit (112) through the starting unit, the other end of the filtering unit is grounded, and the output end of the photosensitive unit is grounded through the feedback module (230).
4. The LED light sensation lamp control circuit as claimed in claim 3, wherein the starting unit comprises a first voltage dividing resistor set, a second voltage dividing resistor set and a first current limiting resistor, the filtering unit comprises a first capacitor, and the light sensing unit comprises a light sensing element;
the output end of the rectifying and filtering unit (111) is respectively connected with one end of the second divider resistor group and one end of the first current-limiting resistor through the first divider resistor group, the other end of the second divider resistor group is grounded or the other end of the second divider resistor group is grounded through the detection module (220), the other end of the first current-limiting resistor is respectively connected with the input end of the photosensitive element and the control signal input end of the constant current control unit (112), the other end of the first current-limiting resistor is grounded through the first capacitor, and the output end of the photosensitive element is grounded through the feedback module (230).
5. An LED lamp, characterized in that the LED lamp is provided with the LED light sensation lamp control circuit as claimed in any one of claims 1 to 4.
CN202111616159.2A 2021-12-27 2021-12-27 LED light sense lamp control circuit and LED lamp Active CN114430598B (en)

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