CN108633143A - A kind of light adjusting circuit of LED light - Google Patents
A kind of light adjusting circuit of LED light Download PDFInfo
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- CN108633143A CN108633143A CN201810788158.8A CN201810788158A CN108633143A CN 108633143 A CN108633143 A CN 108633143A CN 201810788158 A CN201810788158 A CN 201810788158A CN 108633143 A CN108633143 A CN 108633143A
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- resistance
- led light
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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
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Abstract
A kind of light adjusting circuit of LED light, it is related to LED light technical field, its circuit includes input voltage source, triangular-wave generator, bleeder circuit and comparator, the reference voltage terminal of the voltage output termination comparator of triangular-wave generator, another input terminal of the voltage output termination comparator of bleeder circuit, the output of comparator is connected to the photophore of optocoupler, the light-receiving device of optocoupler is connected to LED light driving chip, triangular-wave generator includes resistance R24, resistance R25, resistance R26, resistance R28, one of capacitance C19 and operational amplifier U5 operational amplifier, the present invention is because lacked the thermally sensitive element such as triode, the influence of the extraneous factors such as temperature can be reduced.
Description
Technical field
The present invention relates to LED light technical fields, more particularly to a kind of light adjusting circuit of LED light.
Background technology
The small of light emitting diode (LightEmittingDiode, LED), power saving and durable, and with technique
Maturation, price fall are recently more and more common as the product of light source with light emitting diode.And with the section in carbon reduction
Under skill trend, light emitting diode is increasingly becoming the light source of a new generation.LED operation voltage is low, can actively shine and have one
The characteristics of determining brightness, brightness voltage available or current regulation, being provided simultaneously with impact resistance, anti-vibration, long lifespan (100,000 hours).Institute
Be widely used in various terminal equipment with light emitting diode, from car headlamp, traffic lights, indicator by character,
Plate and big screen video display, to fields such as regular grade architectural lighting and LCD backlights.
The high expensive of traditional 0-10V light modulation input and conversion circuit, with uneven non-of prodigious discreteness and Chinese pennisetum green bristlegrass
Linear characteristic, and will generally use triode, and triode is very sensitive to temperature and extraneous factor, therefore, temperature and
Extraneous factor is very big to the influence for dimming result.
Invention content
A kind of light adjusting circuit of LED light is provided it is an object of the invention to avoid shortcoming in the prior art, it should
The light adjusting circuit of LED light is influenced small by ambient temperature.
The purpose of the present invention is achieved through the following technical solutions：
A kind of light adjusting circuit of LED light is provided, for being connected to LED light driving chip comprising linear adjustable input voltage source,
Triangular-wave generator, bleeder circuit and comparator, the reference voltage terminal of the voltage output termination comparator of triangular-wave generator, point
Another input terminal of the voltage output termination comparator of volt circuit, the output of comparator are connected to the photophore of optocoupler, optocoupler
Light-receiving device be connected to LED light driving chip, the triangular-wave generator includes resistance R24, resistance R25, resistance R26, resistance
One of R28, capacitance C19 and operational amplifier U5 operational amplifiers, the voltage of+15V connect operational amplifier U5's respectively
The other end of one end of INPUT pins and resistance R26, resistance R26 is connect with one end of one end of resistance R25, resistance R28, electricity
The other end ground connection of R28 is hindered, an end of capacitance C19 is connected to one end of resistance R24 and the INHIBIT pins of operational amplifier U5,
The other end ground connection of capacitance C19, the other end of resistance R24 and the other end of resistance R25 are connected to the GND4 of operational amplifier U5
Pin.
Wherein, the bleeder circuit includes resistance R23, resistance R29 and resistance R41, the electricity of a termination+15V of resistance R23
Pressure, one end of another terminating resistor R41 of resistance R23, one end of another terminating resistor R29 of resistance 41, resistance R29's is another
End ground connection, the contact between resistance R41 and resistance R29 are connected to the GND1 pins of operational amplifier U5, resistance R23 and resistance R41
Between contact connect the anode of diode D5, the adjustable input voltage source of negative terminal of diode D5.
Wherein, the diode D5 is the Schottky diode that model is IN5819.
Wherein, the resistance R23 is the Chip-R that resistance value is 47K Ω, and resistance R29 is the patch electricity that resistance value is 47K Ω
Resistance, resistance R41 are the Chip-R that resistance value is 47K Ω.
Wherein, the light adjusting circuit of the LED light further includes diode D6 and D7, and the anode of diode D6 connects operational amplifier
The cathode of the GND3 pins of U5, diode D6 connects the GND4 pins of operational amplifier U5, and the anode of diode D7 connects through resistance R31
To the INHIBIT pins of operational amplifier U5, the cathode of diode D7 is connected to the GND4 pins of operational amplifier U5.
Wherein, the diode D3 and diode D4 is the Schottky diode that model is IN5819.
Wherein, two input terminals of the comparator are respectively the GND1 pins and GND2 pins of operational amplifier U5, institute
The output end for stating comparator is the OUTPUT pins of operational amplifier U5.
Wherein, the resistance R24 is the Chip-R that resistance value is 220K Ω, and resistance R25 is the patch that resistance value is 100K Ω
Resistance, resistance R26 are the Chip-Rs that resistance value is 470K Ω, and resistance R28 is the Chip-R that resistance value is 43K Ω, and capacitance C19 is
Capacitance is the patch capacitor of 100PF.
Wherein, the optocoupler is the optocoupler that model is PC817.
Wherein, the range of the linear adjustable input voltage is 0 to 10V.
Beneficial effects of the present invention：The present invention includes linear adjustable input voltage source, triangular-wave generator, bleeder circuit
And comparator, the reference voltage terminal of the voltage output termination comparator of triangular-wave generator, the voltage output termination of bleeder circuit
Another input terminal of comparator, the output of comparator are connected to the photophore of optocoupler, and the light-receiving device of optocoupler is connected to LED light driving
Chip, the triangular-wave generator include resistance R24, resistance R25, resistance R26, resistance R28, capacitance C19 and operational amplifier
One of U5 operational amplifiers, the voltage of+15V connect respectively operational amplifier U5 INPUT pins and resistance R26 one
End, the other end of resistance R26 are connect with one end of one end of resistance R25, resistance R28, the other end ground connection of resistance R28, capacitance
An end of C19 is connected to one end of resistance R24 and the INHIBIT pins of operational amplifier U5, the other end ground connection of capacitance C19, electricity
The other end of the other end and resistance R25 that hinder R24 is connected to the GND4 pins of operational amplifier U5, and the present invention is because lacked three poles
The thermally sensitive element such as pipe, can reduce the influence of the extraneous factors such as temperature, because of the voltage of linear adjustable input voltage
Variation is smoothly changed, it can be achieved that linearity light adjusting.
Description of the drawings
Invention is described further using attached drawing, but the embodiment in attached drawing does not constitute any limitation of the invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to the following drawings
Its attached drawing.
Fig. 1 is a kind of overall structure diagram of the light adjusting circuit of LED light of the present invention.
Specific implementation mode
The invention will be further described with the following Examples.
A kind of light adjusting circuit of the LED light of the present embodiment, for being connected to LED light driving chip, as shown in Figure 1 comprising 0
To linear adjustable input voltage source, triangular-wave generator, bleeder circuit and the comparator of 10V, the voltage of triangular-wave generator
The reference voltage terminal of output termination comparator, another input terminal of the voltage output termination comparator of bleeder circuit, comparator
Output be connected to the photophore of optocoupler, the light-receiving device of optocoupler is connected to LED light driving chip.
As shown in Figure 1, the triangular-wave generator includes resistance R24, resistance R25, resistance R26, resistance R28, capacitance C19
With one of operational amplifier U5 operational amplifier, the voltage of+15V connect respectively operational amplifier U5 INPUT pins and
The other end of one end of resistance R26, resistance R26 is connect with one end of one end of resistance R25, resistance R28, and resistance R28's is another
End ground connection, an end of capacitance C19 are connected to one end of resistance R24 and the INHIBIT pins of operational amplifier U5, and capacitance C19's is another
One end ground connection, the other end of resistance R24 and the other end of resistance R25 are connected to the GND4 pins of operational amplifier U5.
Wherein, the bleeder circuit includes resistance R23, resistance R29 and resistance R41, the electricity of a termination+15V of resistance R23
Pressure, one end of another terminating resistor R41 of resistance R23, one end of another terminating resistor R29 of resistance 41, resistance R29's
The other end is grounded, and the contact between resistance R41 and resistance R29 is connected to the GND1 pins of operational amplifier U5, resistance R23 and resistance
Contact between R41 connects the anode of diode D5, the adjustable input voltage source of negative terminal of diode D5.
Wherein, the diode D5 is the Schottky diode that model is IN5819, and diode D5 linearly may be used for dragging down
The dim signal of the input voltage source of tune plays the role of antilogical, i.e., linear adjustable input voltage source exports 0V, then LED
Lamp is most bright, exports 10V, then LED light is most dark.
Wherein, the resistance R23 is the Chip-R that resistance value is 47K Ω, and resistance R29 is the patch electricity that resistance value is 47K Ω
Resistance, resistance R41 are the Chip-R that resistance value is 47K Ω.
Wherein, the light adjusting circuit of the LED light further includes diode D6 and D7, and the anode of diode D6 connects operational amplifier
The cathode of the GND3 pins of U5, diode D6 connects the GND4 pins of operational amplifier U5, and the anode of diode D7 connects through resistance R31
To the INHIBIT pins of operational amplifier U5, the cathode of diode D7 is connected to the GND4 pins of operational amplifier U5.Diode
D6, diode D7 and diode R31 are for feedback signal to circuit.
Wherein, the diode D3 and diode D4 is the Schottky diode that model is IN5819, two pole of Schottky
The thermal losses of pipe is relatively low.
Wherein, two input terminals of the comparator are respectively the GND1 pins and GND2 pins of operational amplifier U5, institute
The output end for stating comparator is the OUTPUT pins of operational amplifier U5.
Wherein, the resistance R24 is the Chip-R that resistance value is 220K Ω, and resistance R25 is the patch that resistance value is 100K Ω
Resistance, resistance R26 are the Chip-Rs that resistance value is 470K Ω, and resistance R28 is the Chip-R that resistance value is 43K Ω, and capacitance C18 is
Capacitance is the patch capacitor of 4.7nF, and capacitance C19 is the patch capacitor that capacitance is 100PF.
Wherein, the optocoupler is the optocoupler that model is PC817.
Capacitance C18 in figure is filter capacitor, is the patch capacitor that capacitance is 4.7nF.
The voltage output end of voltage and bleeder circuit that the voltage output end of the triangular-wave generator of the present embodiment exports
Voltage by comparing device relatively after, output duty cycle variation square-wave signal arrive optocoupler photophore, optocoupler light-receiving device generation
Drive signal to LED light driving chip, and then realize light modulation.The present embodiment is because lacked the thermally sensitive member such as triode
Part can reduce the influence of the extraneous factors such as temperature, can because the voltage change of linear adjustable input voltage smoothly changes
Realize linearity light adjusting.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although being explained in detail to the present invention with reference to preferred embodiment, those skilled in the art answer
Work as understanding, technical scheme of the present invention can be modified or replaced equivalently, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (10)
1. a kind of light adjusting circuit of LED light, for being connected to LED light driving chip, it is characterised in that：Including linear adjustable input
Voltage source, triangular-wave generator, bleeder circuit and comparator, the benchmark electricity of the voltage output termination comparator of triangular-wave generator
Pressure side, another input terminal of the voltage output termination comparator of bleeder circuit, the output of comparator are connected to shining for optocoupler
The light-receiving device of device, optocoupler is connected to LED light driving chip,
The triangular-wave generator includes resistance R24, resistance R25, resistance R26, resistance R28, capacitance C19 and operational amplifier U5
One of operational amplifier, the voltage of+15V connect one end of the INPUT pins and resistance R26 of operational amplifier U5 respectively,
The other end of resistance R26 is connect with one end of one end of resistance R25, resistance R28, the other end ground connection of resistance R28, capacitance C19
An end be connected to one end of resistance R24 and the INHIBIT pins of operational amplifier U5, the other end ground connection of capacitance C19, resistance
The other end of R24 and the other end of resistance R25 are connected to the GND4 pins of operational amplifier U5.
2. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：The bleeder circuit includes resistance
R23, resistance R29 and resistance R41, the voltage of a termination+15V of resistance R23, the one of another terminating resistor R41 of resistance R23
End, one end of another terminating resistor R29 of resistance 41, the other end ground connection of resistance R29, connecing between resistance R41 and resistance R29
Point is connected to the GND1 pins of operational amplifier U5, and the contact between resistance R23 and resistance R41 connects the anode of diode D5, two poles
The adjustable input voltage source of negative terminal of pipe D5.
3. a kind of light adjusting circuit of LED light as claimed in claim 2, it is characterised in that：The diode D5 is for model
The Schottky diode of IN5819.
4. a kind of light adjusting circuit of LED light as claimed in claim 2, it is characterised in that：The resistance R23 is that resistance value is 47K
The Chip-R of Ω, resistance R29 are the Chip-R that resistance value is 47K Ω, and resistance R41 is the Chip-R that resistance value is 47K Ω.
5. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：The light adjusting circuit of the LED light also wraps
Diode D6 and D7 are included, the anode of diode D6 connects the GND3 pins of operational amplifier U5, and the cathode of diode D6 connects operation and puts
The GND4 pins of big device U5, the anode of diode D7 are connected to the INHIBIT pins of operational amplifier U5, diode through resistance R31
The cathode of D7 is connected to the GND4 pins of operational amplifier U5.
6. a kind of light adjusting circuit of LED light as claimed in claim 5, it is characterised in that：The diode D3 and diode D4
It is the Schottky diode that model is IN5819.
7. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：Two input terminals of the comparator
The output end of respectively the GND1 pins of operational amplifier U5 and GND2 pins, the comparator is operational amplifier U5's
OUTPUT pins.
8. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：The resistance R24 is that resistance value is 220K
The Chip-R of Ω, resistance R25 are the Chip-Rs that resistance value is 100K Ω, and resistance R26 is the Chip-R that resistance value is 470K Ω,
Resistance R28 is the Chip-R that resistance value is 43K Ω, and capacitance C19 is the patch capacitor that capacitance is 100PF.
9. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：The optocoupler is that model is PC817
Optocoupler.
10. a kind of light adjusting circuit of LED light as described in claim 1, it is characterised in that：The linear adjustable input voltage
Range be 0 to 10V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810788158.8A CN108633143A (en) | 2018-07-18 | 2018-07-18 | A kind of light adjusting circuit of LED light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810788158.8A CN108633143A (en) | 2018-07-18 | 2018-07-18 | A kind of light adjusting circuit of LED light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108633143A true CN108633143A (en) | 2018-10-09 |
Family
ID=63688871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810788158.8A Pending CN108633143A (en) | 2018-07-18 | 2018-07-18 | A kind of light adjusting circuit of LED light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108633143A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158083A (en) * | 2011-04-22 | 2011-08-17 | 复旦大学 | BUCK converter for stabilizing output light flux of LED (light-emitting diode) |
| CN202696961U (en) * | 2012-06-08 | 2013-01-23 | 深圳市索源科技有限公司 | Light emitting diode (LED) dimming device |
| TW201311045A (en) * | 2011-08-19 | 2013-03-01 | Holtek Semiconductor Inc | Light source device and dimming control circuit thereof |
| KR20130074535A (en) * | 2011-12-26 | 2013-07-04 | 전자부품연구원 | System for controlling light emitting diode dimming and lighting apparatus thereof |
| CN203492241U (en) * | 2013-09-29 | 2014-03-19 | 郑州创亿达照明有限公司 | Novel LED dimming module |
| CN205864803U (en) * | 2016-07-18 | 2017-01-04 | 宁海县芯飞电子科技有限公司 | The high-brightness LED drive circuit that a kind of civil power directly inputs |
| CN207099387U (en) * | 2017-08-02 | 2018-03-13 | 深圳市暗能量电源有限公司 | LED street lamp drive circuit |
| CN208479993U (en) * | 2018-07-18 | 2019-02-05 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
-
2018
- 2018-07-18 CN CN201810788158.8A patent/CN108633143A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158083A (en) * | 2011-04-22 | 2011-08-17 | 复旦大学 | BUCK converter for stabilizing output light flux of LED (light-emitting diode) |
| TW201311045A (en) * | 2011-08-19 | 2013-03-01 | Holtek Semiconductor Inc | Light source device and dimming control circuit thereof |
| KR20130074535A (en) * | 2011-12-26 | 2013-07-04 | 전자부품연구원 | System for controlling light emitting diode dimming and lighting apparatus thereof |
| CN202696961U (en) * | 2012-06-08 | 2013-01-23 | 深圳市索源科技有限公司 | Light emitting diode (LED) dimming device |
| CN203492241U (en) * | 2013-09-29 | 2014-03-19 | 郑州创亿达照明有限公司 | Novel LED dimming module |
| CN205864803U (en) * | 2016-07-18 | 2017-01-04 | 宁海县芯飞电子科技有限公司 | The high-brightness LED drive circuit that a kind of civil power directly inputs |
| CN207099387U (en) * | 2017-08-02 | 2018-03-13 | 深圳市暗能量电源有限公司 | LED street lamp drive circuit |
| CN208479993U (en) * | 2018-07-18 | 2019-02-05 | 惠州市烁达德高光电科技有限公司 | A kind of light adjusting circuit of LED light |
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