CN206759766U - Dim the LED drive circuit of toning - Google Patents
Dim the LED drive circuit of toning Download PDFInfo
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- CN206759766U CN206759766U CN201720139032.9U CN201720139032U CN206759766U CN 206759766 U CN206759766 U CN 206759766U CN 201720139032 U CN201720139032 U CN 201720139032U CN 206759766 U CN206759766 U CN 206759766U
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Abstract
The utility model provides a kind of LED drive circuit for dimming toning, including：Light adjusting circuit, color-temperature regulating comparison circuit, output light source module；The output light source module goes out the LED light source that light color temperature differs including at least two groups；The color-temperature regulating comparison circuit includes a comparator and switching tube；One input of the comparator sets a constant reference voltage, and the electric current that the voltage of another input exports with light adjusting circuit increases and increased；The output end of comparator is connected with the grid of the switching tube；The conducting and shut-off of the switch controlled one of which LED light source, and then change and light color temperature.The utility model provides a kind of LED drive circuit for dimming toning, and cost is low simple in construction.
Description
Technical field
It the utility model is related to LED drive circuit, more particularly to a kind of dimming LED drive circuit.
Background technology
LED illumination lamp is because the advantages of its brightness is high, power is small, service life is long has obtained extensively in today's society
Ground popularization and application.Traditional LED lamp often only possesses the function of light modulation, and changes the luminous flux size of light fixture output, and
Do not possess toning function, exactly change the light color temperature of light fixture output.In order to change this present situation, added in LED drive circuit
The function of toning.
Increasing the function of toning in traditional LED dimming driving circuits needs to increase single-chip microcomputer and leading portion bus phase angle
Detection, circuit is very complicated, and cost is also higher.
Utility model content
Technical problem underlying to be solved in the utility model is to provide a kind of LED drive circuit for dimming toning, cost
It is low simple in construction.
In order to solve above-mentioned technical problem, the utility model provides a kind of LED drive circuit for dimming toning, bag
Include：Light adjusting circuit, color-temperature regulating comparison circuit, output light source module；
The output light source module goes out the LED light source that light color temperature differs including at least two groups；
The color-temperature regulating comparison circuit includes a comparator and switching tube；One input of the comparator sets one
Constant reference voltage, the electric current that the voltage of another input exports with light adjusting circuit increase and increased；The output of comparator
End is connected with the grid of the switching tube；
The conducting and shut-off of the switch controlled one of which LED light source, and then change and light color temperature.
In a preferred embodiment：The output light source module includes first group of LED light source and second group of LED light source, its
In the output voltage of first group of LED light source be less than the output voltage of second group of LED light source.
In a preferred embodiment：The output voltage difference of first group of LED light source and second group of LED light source is at least 3V.
In a preferred embodiment：During the switching tube conducting, first group of LED light source and second group of LED light source are led respectively
It is logical；With the increase of light adjusting circuit output current, prior to second group LED light source of first group of LED light source is lighted, and goes out light color temperature for the
The colour temperature of one group of LED light source；Continue to increase with light adjusting circuit output current, first group of LED light source and second group of LED light source
Light simultaneously, go out mixing colour temperature of the light color temperature for first group, second group LED light source；When the electric current of light adjusting circuit output increases to
When switching tube turns off, first group of LED light source extinguishes, second group of LED light source is remain on, and it is second group of LED to go out light color temperature
Colour temperature.
In a preferred embodiment：First group of LED light source and second group of LED light source share an output cathode.
In a preferred embodiment：The output cathode is connected to the positive pole of the comparator by a Voltage stabilizing module circuit
Input.
In a preferred embodiment：The output negative pole of first group of LED light source is connected to the drain electrode of switching tube, switching tube
Source electrode be connected with the output negative pole of second group of LED light source, the negative input of comparator；The output of second group of LED is born
Pole is grounded by a decompression network.
In a preferred embodiment：The Voltage stabilizing module circuit includes the resistance R31 and voltage-stabiliser tube ZD111 being connected in series；
Described resistance R31 one end is connected with the output cathode, and the other end is connected to voltage-stabiliser tube ZD111 negative electrode, voltage-stabiliser tube ZD111's
Plus earth.
In a preferred embodiment：The Voltage stabilizing module circuit also includes the resistance R32 and voltage-stabiliser tube being connected in series
TL431；One end of the resistance R32 is connected with R31 and voltage-stabiliser tube ZD111 common port, and the other end is connected to voltage-stabiliser tube TL431
Negative electrode and reference edge；The plus earth of the voltage-stabiliser tube TL431, voltage-stabiliser tube TL431 negative electrode are connected to the positive pole of comparator
Input.
In a preferred embodiment：The light adjusting circuit is thyristor regulating optical circuit, PMW light adjusting circuits, single-chip microcomputer light modulation
One kind in circuit, switch dimming circuit, bluetooth light adjusting circuit.
Compared to prior art, the utility model possesses following beneficial effect：
Therefore, by the output voltage of comparator come controlling switch pipe Q11 grid voltage, controlling switch pipe Q11's leads
Logical and shut-off, so as to control the conducting and cut-off of first group of LED light source.Control whole light fixture goes out light color temperature from first group of LED
Colour temperature carry out colour mixtures to two groups of LED, then to second group of LED colour temperature.So as to realize the switching of different LED colour temperatures.
Brief description of the drawings
Fig. 1 is dimming driving circuit figure in the utility model preferred embodiment；
Fig. 2 is color-temperature regulating comparison circuit figure in the utility model preferred embodiment.
Embodiment
The utility model is described further below in conjunction with the drawings and specific embodiments.
It is a kind of while change luminous flux and the LED drive circuit of light color temperature with reference to figure 1-2, including：Light adjusting circuit 1, toning
Warm comparison circuit, output light source module 2；
The output light source module 2 goes out the LED light source that light color temperature differs including two groups；
The color-temperature regulating comparison circuit includes a comparator U12 and switching tube Q11；One input of the comparator
One constant reference voltage is set, and the electric current that the voltage of another input exports with light adjusting circuit increases and increased；Comparator
Output end be connected with the grid of the switching tube；
The output light source module includes first group of LED light source and second group of LED light source, wherein first group of LED light source
Output voltage is less than the output voltage of second group of LED light source, and its difference is at least 3V.
Specific circuit structure is as follows：First group of LED light source and second group of LED light source share an output cathode.Institute
State the electrode input end that output cathode is connected to the comparator by a Voltage stabilizing module circuit.
The output negative pole of first group of LED light source is connected to switching tube Q11 drain electrode, switching tube Q11 source electrode and
The negative input connection of the output negative pole, comparator U12 of two groups of LED light sources；The output negative pole of second group of LED passes through one
Decompression network (resistance R37, R38 of series connection) is grounded.
The Voltage stabilizing module circuit includes the resistance R31 and voltage-stabiliser tube ZD11 being connected in series；Described resistance R31 one end and institute
Output cathode connection is stated, the other end is connected to voltage-stabiliser tube ZD11 negative electrode, voltage-stabiliser tube ZD11 plus earth.Voltage-stabiliser tube ZD11 will
The voltage stabilization of output cathode output is to 5.1V.5.1V voltages after stable are connected to voltage-stabiliser tube after resistance R2 partial pressures again
U11 negative electrode and reference edge, the 2.5V voltages stablized, 2.5V voltages obtain voltage after resistance R33 and R34 partial pressure again
Uref.Voltage Uref is connected to voltage-stabiliser tube ZD12 negative electrode by resistance R35, R36 again.Wherein, R35 and R36 common port with than
Electrode input end connection compared with device U12.
Therefore, the voltage stabilization of comparator electrode input end is：
U12+=(Uref*R36+Uz2*R35)/(R35+R36)
And the voltage of comparator negative input is：
U12-=I3*(R38+R37)
I3For two paths of LED light source negative pole output current sum.Therefore the voltage of comparator negative input is with light modulation electricity
The increase of road output current and increase.
After above-mentioned setting, when circuit starts to start, light adjusting circuit is transferred to least significant end, the voltage of light adjusting circuit output
LED+ is very low, starts output current I0, now there is electric current to flow through second group of LED light source, but electric current I2Very little, can't be maintained
Two groups of LED light source normal works, therefore the second paths of LEDs light source is non-lit up.Because electric current I2Very little, switching tube Q11 are not turned on, I3
=I2, U12-=I2(R38+R37), now U12-<U12+.Comparator exports high level, switching tube Q11 conductings, first group of LED
Light source begins with electric current I1Flow through.Now U12- ≈ Ui=I3(R38+R37), voltage U12- is also less than voltage U12+.
When the phase angle of light modulator slowly increases, output voltage LED+ slowly increases, output current I0Also slowly increase.
As output current I0Increase to when can maintain the work of first group of LED light source, first group of LED light source is started working, and passes through the
The electric current I of two groups of LED light sources2Second group of LED light source normal work can't be maintained.Slowly increase with the phase angle of light modulator
Greatly, output current I0Also slowly increase, the electric current I on the 1st tunnel1Also increase, first group of LED light source is more and more brighter.Flow through second group
The electric current I of LED light source2Also increase, but do not turn on also.Now go out colour temperature of the light color temperature for first group of LED light source.
When the phase angle of light modulator increases to some angle, pass through the electric current I of second group of LED light source2Increasing to can be with
When maintaining second group of LED light source work, second group of LED light source starts to light, and U12- now<U12+, now two groups of LED lights
Source is lighted simultaneously, carries out colour mixture, goes out light color temperature change.
As the phase angle of light modulator continues to increase, output current I0Also continue to increase, be more than when increasing to voltage U12-
During voltage U12+, comparator output low level, switching tube Q11 is turned off, first group of LED light source shut-off, now only second group of LED
Light source works, go out colour temperature of the light color temperature for second group of LED.
Therefore, by the output voltage of comparator come controlling switch pipe Q11 grid voltage, controlling switch pipe Q11's leads
Logical and shut-off, so as to control the conducting and cut-off of first group of LED light source.Control whole light fixture goes out light color temperature from first group of LED
Colour temperature carry out colour mixtures to two groups of LED, then to second group of LED colour temperature.So as to realize the switching of different LED colour temperatures.
It is described above, the only preferable embodiment of the utility model, but design concept of the present utility model is not
This is confined to, any one skilled in the art utilizes this design in the technical scope that the utility model discloses
The change of unsubstantiality is carried out to the utility model, belongs to invade the behavior of scope of protection of the utility model.
Claims (10)
- A kind of 1. LED drive circuit for dimming toning, it is characterised in that including：Light adjusting circuit, color-temperature regulating comparison circuit, output light Source module；The output light source module goes out the LED light source that light color temperature differs including at least two groups；The color-temperature regulating comparison circuit includes a comparator and switching tube；The input setting one of the comparator is constant Reference voltage, the electric current that the voltage of another input exports with light adjusting circuit increase and increased；The output end of comparator with The grid connection of the switching tube；The conducting and shut-off of the switch controlled one of which LED light source, and then change and light color temperature.
- A kind of 2. LED drive circuit for dimming toning according to claim 1, it is characterised in that：The output light source mould Group includes first group of LED light source and second group of LED light source, wherein the output voltage of first group of LED light source is less than second group of LED light The output voltage in source.
- A kind of 3. LED drive circuit for dimming toning according to claim 2, it is characterised in that：First group of LED light source with The output voltage difference of second group of LED light source is at least 3V.
- A kind of 4. LED drive circuit for dimming toning according to claim 2, it is characterised in that：The switching tube conducting When, first group of LED light source and second group of LED light source are respectively turned on；With the increase of light adjusting circuit output current, first group of LED Prior to second group LED light source of light source is lighted, and goes out colour temperature of the light color temperature for first group of LED light source；With light adjusting circuit output current Continue increase, first group of LED light source and second group of LED light source are lighted simultaneously, and it is first group, second group of LED light to go out light color temperature The mixing colour temperature in source；When the electric current of light adjusting circuit output increases to switching tube shut-off, first group of LED light source extinguish, the Two groups of LED light sources are remain on, and go out colour temperature of the light color temperature for second group of LED.
- A kind of 5. LED drive circuit for dimming toning according to claim 2, it is characterised in that：First group of LED light Source and second group of LED light source share an output cathode.
- A kind of 6. LED drive circuit for dimming toning according to claim 5, it is characterised in that：The output cathode leads to Cross the electrode input end that a Voltage stabilizing module circuit is connected to the comparator.
- A kind of 7. LED drive circuit for dimming toning according to claim 6, it is characterised in that：First group of LED light The output negative pole in source is connected to the drain electrode of switching tube, the output negative pole of the source electrode of switching tube and second group of LED light source, comparator Negative input connects；The output negative pole of second group of LED is grounded by a decompression network.
- A kind of 8. LED drive circuit for dimming toning according to claim 7, it is characterised in that：The Voltage stabilizing module electricity Road includes the resistance R31 and voltage-stabiliser tube ZD111 being connected in series；Described resistance R31 one end is connected with the output cathode, the other end It is connected to voltage-stabiliser tube ZD111 negative electrode, voltage-stabiliser tube ZD111 plus earth.
- A kind of 9. LED drive circuit for dimming toning according to claim 8, it is characterised in that：The Voltage stabilizing module electricity Road also includes the resistance R32 and voltage-stabiliser tube TL431 being connected in series；One end of the resistance R32 is with R31's and voltage-stabiliser tube ZD111 Common port connects, and the other end is connected to voltage-stabiliser tube TL431 negative electrode and reference edge；The plus earth of the voltage-stabiliser tube TL431, surely Pressure pipe TL431 negative electrode is connected to the electrode input end of comparator.
- A kind of 10. LED drive circuit of light modulation toning according to any one of claim 1-9, it is characterised in that：It is described Light adjusting circuit is thyristor regulating optical circuit, PMW light adjusting circuits, single-chip microcomputer light adjusting circuit, switch dimming circuit, bluetooth light adjusting circuit In one kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139032.9U CN206759766U (en) | 2017-02-16 | 2017-02-16 | Dim the LED drive circuit of toning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720139032.9U CN206759766U (en) | 2017-02-16 | 2017-02-16 | Dim the LED drive circuit of toning |
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| Publication Number | Publication Date |
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| CN206759766U true CN206759766U (en) | 2017-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720139032.9U Active CN206759766U (en) | 2017-02-16 | 2017-02-16 | Dim the LED drive circuit of toning |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111836420A (en) * | 2019-04-17 | 2020-10-27 | 漳州立达信光电子科技有限公司 | LED driving method, circuit, LED device and driving power module |
-
2017
- 2017-02-16 CN CN201720139032.9U patent/CN206759766U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111836420A (en) * | 2019-04-17 | 2020-10-27 | 漳州立达信光电子科技有限公司 | LED driving method, circuit, LED device and driving power module |
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