CN108449836B - LED light control circuit and LED lamp - Google Patents
LED light control circuit and LED lamp Download PDFInfo
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- CN108449836B CN108449836B CN201810296147.8A CN201810296147A CN108449836B CN 108449836 B CN108449836 B CN 108449836B CN 201810296147 A CN201810296147 A CN 201810296147A CN 108449836 B CN108449836 B CN 108449836B
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- 238000010168 coupling process Methods 0.000 claims abstract description 35
- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 238000005286 illumination Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 28
- 238000005265 energy consumption Methods 0.000 abstract description 3
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- 241001465382 Physalis alkekengi Species 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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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
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention belongs to the technical field of LED lamp control, and provides an LED lamp light control circuit which is connected between an output end of a switching power supply and a control end of the switching power supply, and comprises: the photoelectric sensing module is configured to sense illumination intensity of ambient light and output a first voltage signal; the first switch module is connected with the photoelectric sensing module, and is configured to realize on-off control according to the first voltage signal and output a first control signal; the photoelectric coupling module is connected with the first switch module and is configured to isolate and output the first control signal; the self-locking module is connected with the photoelectric coupling module, receives the first control signal and continuously outputs a second control signal to the LED lamp; and the delay module is connected with the photoelectric coupling module and the self-locking module and is configured to unlock the self-locking module, so that the circuit is simple, the energy consumption is saved, and the cost is lower.
Description
Technical Field
The invention belongs to the technical field of LED lamp control, and particularly relates to an LED lamp light control circuit and an LED lamp.
Background
Currently, dc LEDs are considered as green fourth generation light sources, and are increasingly used, and there is a great trend to replace conventional light sources such as incandescent lamps and fluorescent lamps. The switching power supply has high efficiency, can realize large-range voltage output, has continuously adjustable output voltage and high output power, and is the most commonly used driving mode for LED illumination, especially in the middle and high power occasions. The dimming control of the LED lamp can achieve the effect of energy saving. The control can be performed as follows: when the outside is very dark, the LED lamp works under rated power, and when the illumination intensity is relatively good, the LED lamp is automatically turned off. The driving technology of the switching power supply is relatively mature, but the cost of the dimming control part is too high, a special detection circuit is used for detecting the illumination intensity, a singlechip is used for processing the detected signal, and the switching power supply is controlled to perform dimming after the processing; the control circuit is complex, the circuit cost is high, and software programming is needed.
Therefore, the traditional technical scheme has the problems of complex control circuit and higher circuit cost.
Disclosure of Invention
The invention aims to provide an LED light control circuit, which aims to solve the problems of complex control circuit and higher circuit cost in the traditional technical scheme.
An LED light control circuit connected with a switching power supply, the LED light control circuit comprising:
the photoelectric sensing module is connected with the output end of the switching power supply, is configured to sense the illumination intensity of ambient light and output a first voltage signal;
the first switch module is connected with the photoelectric sensing module, and is configured to realize on-off control according to the first voltage signal and output a first control signal;
the photoelectric coupling module is connected with the first switch module and is configured to isolate and output the first control signal;
the self-locking module is connected with the photoelectric coupling module, receives the first control signal and outputs a second control signal to the control end of the switching power supply according to the first control signal;
and the delay module is connected with the photoelectric coupling module and the self-locking module and is configured to unlock the self-locking module.
In one embodiment, the photo-sensing module includes a photo-resistor, a first resistor, and a first capacitor; the first end of the photoresistor is connected with the output end of the switching power supply, the second end of the photoresistor is connected with the first end of the first capacitor, the second end of the first capacitor is grounded, and the first resistor is connected between the first end of the first capacitor and the first switching module.
In one embodiment, the first switch module includes a first triode, a second resistor, and a third resistor;
the collector of the first triode is connected with the output end of the switching power supply through the second resistor, the base of the first triode is grounded through the third resistor, and the base of the first triode is connected with the photoelectric sensing module.
In one embodiment, the self-locking module includes a second triode, a third triode, a fourth resistor and a fifth resistor; the emitter of the second triode is connected with the first end of the light receiver of the photoelectric coupling module, the collector of the second triode is connected with the collector of the third triode, the base of the second triode is connected with the control end of the switching power supply through the fifth resistor, the fourth resistor is connected between the emitter and the base, the base of the third triode is connected with the time delay module, the emitter of the third triode is connected with the base of the fourth triode, the collector of the third triode is connected with the second end of the light receiver, the collector of the fourth triode is connected with the control end of the switching power supply, and the emitter of the fourth triode is grounded.
In one embodiment, the delay module includes a second capacitor and a sixth resistor; the first end of the second capacitor is connected with the light receiver of the photoelectric coupling module, the second end of the second capacitor is grounded, and the sixth resistor is connected with the first end of the second capacitor and the self-locking module.
In one embodiment, the photoelectric coupling device further comprises a diode and a seventh resistor, wherein the anode of the diode is connected with the light receiver of the photoelectric coupling module and is connected between the photoelectric coupling module and the self-locking module.
In addition, still provide a LED lamps and lanterns, include: the LED lamp control circuit comprises a switch power supply, an LED lamp and the LED lamp control circuit connected between the output end of the switch power supply and the control end of the switch power supply, wherein the output end of the switch power supply is connected with the LED lamp, and stable voltage is provided for the LED lamp.
The LED light control circuit senses the illumination intensity of the ambient light through the photoelectric sensing module, outputs a first voltage signal according to the illumination intensity of the ambient light, outputs the first voltage signal to the self-locking module through the first switch module and the photoelectric coupling module, outputs a control signal to the control end of the switch power supply, and controls the output of the switch power supply, so that the LED light is controlled to be turned on or off, the circuit is simple, the energy consumption is saved, and the cost is low.
Drawings
Fig. 1 is a schematic structural diagram of an LED light control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an example of an LED light control circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 shows a schematic structural diagram of an LED light control circuit according to a preferred embodiment of the present invention, and for convenience of explanation, only the portions related to the present embodiment are shown, which are described in detail below:
as shown in fig. 1 and 2, an LED lamp includes: the LED lamp comprises a switching power supply, an LED lamp and an LED lamp light control circuit connected with the switching power supply. The switching power supply adopts a common switching power supply for controlling the LEDs, the output end of the switching power supply outputs stable direct current voltage, and the LED light control circuit is used for controlling the output of the switching power supply to the LED lamps so as to control the on-off of the LED lamps, and the switching power supply is simple in circuit, saves energy consumption and is low in cost.
Wherein, LED lamp light control circuit includes: the photoelectric sensing module 10, the first switch module 20, the photoelectric coupling module 30, the self-locking module 40 and the delay module 50.
The photoelectric sensing module 10 is configured to sense illumination intensity of ambient light and output a first voltage signal; the photo-sensing module 10 comprises a photoresistor CDS, a first resistor R1 and a first capacitor C1; the first end of the photoresistor CDS is connected with the output end of the switching power supply, the second end of the photoresistor CDS is connected with the first end of the first capacitor C1, the second end of the first capacitor C1 is grounded, and the first resistor R1 is connected between the first end of the first capacitor C1 and the first switching module 20. The light sensitive resistor CDS judges whether the current environment is in a night or daytime environment by detecting the ambient light intensity, specifically, when the ambient light intensity is greater than 200LUX, the current environment is considered to be in the daytime, a first RC circuit formed by the first resistor R1 and the first capacitor C1 starts to charge, and a first voltage signal with a higher voltage value is output; when the ambient light intensity is less than 10LUX, the LED lamp is considered to be currently in a night environment, and is controlled to be turned on in a night environment and turned off in a daytime environment.
The first switch module 20 is connected with the photoelectric sensing module 10, and is configured to realize on-off control according to a first voltage signal and output a first control signal; specifically, the first switch module 20 includes a first transistor Q1, a second resistor R2, and a third resistor R3; the collector of the first triode Q1 is connected with the output end of the switching power supply through a second resistor R2, the base of the first triode Q1 is grounded through a third resistor R3, and the base of the first triode Q1 is connected with the photoelectric sensing module 10.
The photoelectric coupling module 30 is connected with the first switch module 20 and is configured to isolate and output a first control signal; the photoelectric coupling module 30 is a photoelectric coupling tube U1, a first end of a light emitting source of the photoelectric coupling tube U1 is connected to an output end of the first switch module 20, a second end of the light emitting source of the photoelectric coupling tube U1 is grounded, a first end of a light receiving end of the photoelectric coupling tube U1 is connected to the self-locking module 40, and a second end of the light receiving end of the photoelectric coupling tube U1 passes between the delay module 50 and the ground. When the voltage value of the first control signal output by the first switch module 20 reaches the on voltage of the light emitting source of the photoelectric coupling tube U1, the light emitting source of the photoelectric coupling tube U1 is turned on, and then the light receiving end of the photoelectric coupling tube U1 is turned on, and the first control signal is isolated and output to the self-locking module 40 and the delay module 50.
The self-locking module 40 is connected with the photoelectric coupling module 30, receives the first control signal, and continuously outputs a second control signal to the LED lamp; the self-locking module 40 comprises a second triode Q2, a third triode Q3, a fourth triode Q4, a fourth resistor R4 and a fifth resistor R5; the emitter of the second triode Q2 is connected with the first end of the light receiver of the photoelectric coupling module 30, the collector of the second triode Q2 is connected with the collector of the third triode Q3, the base of the second triode Q2 is connected with the control end of the switching power supply through a fifth resistor R5, a fourth resistor R4 is connected between the emitter and the base, the base of the third triode Q3 is connected with the delay module 50, the emitter of the third triode Q3 is connected with the base of the fourth triode Q4, the collector of the third triode Q3 is connected with the second end of the light receiver, the collector of the fourth triode Q4 is connected with the control end of the switching power supply, and the emitter of the fourth triode Q4 is grounded.
A delay module 50, coupled to the optocoupler module 30 and the self-locking module 40, is configured to unlock the self-locking module 40. The delay module 50 includes a second capacitor C2 and a sixth resistor R6; the first end of the second capacitor C2 is connected to the light receiver of the photoelectric coupling module 30, the second end of the second capacitor C2 is grounded, and the sixth resistor R6 is connected to the first end of the second capacitor C2 and connected to the self-locking module 40.
The photoelectric coupling device further comprises a diode D1 and a seventh resistor R7, wherein the anode of the diode D1 is connected with the light receiver of the photoelectric coupling module 30 and is connected between the photoelectric coupling module 30 and the self-locking module 40.
When the light is in daytime (the illuminance is more than 200 LUX), the first capacitor C1 is charged through the photoresistor CDS, when the voltage at two ends of the first capacitor C1 is more than the conducting voltage of the photoelectric coupling tube U1, the first triode Q1 is conducted, the second triode Q2, the third triode Q3 and the fourth triode Q4 form a self-locking circuit to work, and at the moment, the fourth triode Q4 is in a deep saturated conducting state, the feedback pin of the control chip of the switching power supply is pulled down, the output of the switching power supply is disconnected, the self-locking time of the self-locking circuit is determined by the delay module 50 formed by the second capacitor C2 and the sixth resistor R6, the photoresistor CDS is always in daytime condition, the LED light control circuit is started to work until the photoresistor CDS is in a dark night condition (the illuminance is less than 10 LUX), and the power supply circuit is recovered to be normal.
Specifically, when the photoresistor CDS is in the condition of night, the circuit is unlocked because the base electrode of the first triode Q1 has no voltage output, the fourth triode Q4 does not work, at the moment, the feedback pin of the control chip of the switching power supply is not controlled by the LED light control circuit, the switching power supply is restored to the normal working state, and stable direct current voltage is output.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. An LED light control circuit connected with a switching power supply, wherein the LED light control circuit comprises:
the photoelectric sensing module is connected with the output end of the switching power supply, is configured to sense the illumination intensity of ambient light and output a first voltage signal;
the first switch module is connected with the photoelectric sensing module, and is configured to realize on-off control according to the first voltage signal and output a first control signal;
the photoelectric coupling module is connected with the first switch module and is configured to isolate and output the first control signal;
the self-locking module is connected with the photoelectric coupling module, receives the first control signal and outputs a second control signal to the control end of the switching power supply according to the first control signal;
the delay module is connected with the photoelectric coupling module and the self-locking module and is configured to unlock the self-locking module;
the self-locking module comprises a second triode, a third triode, a fourth resistor and a fifth resistor; the emitter of the second triode is connected with the first end of the light receiver of the photoelectric coupling module, the collector of the second triode is connected with the collector of the third triode, the base of the second triode is connected with the control end of the switching power supply through the fifth resistor, the fourth resistor is connected between the emitter and the base of the second triode, the base of the third triode is connected with the time delay module, the emitter of the third triode is connected with the base of the fourth triode, the collector of the third triode is connected with the second end of the light receiver, the collector of the fourth triode is connected with the control end of the switching power supply, and the emitter of the fourth triode is grounded;
the photoelectric sensing module comprises a photosensitive resistor, a first resistor and a first capacitor; the first end of the photoresistor is connected with the output end of the switching power supply, the second end of the photoresistor is connected with the first end of the first capacitor, the second end of the first capacitor is grounded, and the first resistor is connected between the first end of the first capacitor and the first switching module.
2. The LED light control circuit of claim 1, wherein the first switch module comprises a first transistor, a second resistor, and a third resistor;
the collector of the first triode is connected with the output end of the switching power supply through the second resistor, the base of the first triode is grounded through the third resistor, and the base of the first triode is connected with the photoelectric sensing module.
3. The LED light control circuit of claim 1, wherein the delay module comprises a second capacitor and a sixth resistor; the first end of the second capacitor is connected with the light receiver of the photoelectric coupling module, the second end of the second capacitor is grounded, and the sixth resistor is connected with the first end of the second capacitor and the self-locking module.
4. The LED light control circuit of claim 1, further comprising a diode and a seventh resistor, wherein an anode of the diode is connected to the light receiver of the optocoupler module and is connected between the optocoupler module and the self-locking module.
5. An LED light fixture, comprising: the LED light control circuit of any one of claims 1-4, wherein the output end of the switching power supply is connected with the LED lamp, and provides a stable voltage to the LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810296147.8A CN108449836B (en) | 2018-04-04 | 2018-04-04 | LED light control circuit and LED lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810296147.8A CN108449836B (en) | 2018-04-04 | 2018-04-04 | LED light control circuit and LED lamp |
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| CN108449836A CN108449836A (en) | 2018-08-24 |
| CN108449836B true CN108449836B (en) | 2024-02-20 |
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| CN117335789B (en) * | 2023-12-01 | 2024-03-22 | 深圳鹏城新能科技有限公司 | Isolation self-locking circuit and method |
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