CN103533701B - Colour temperature control circuit and illuminating device with the same - Google Patents
Colour temperature control circuit and illuminating device with the same Download PDFInfo
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- CN103533701B CN103533701B CN201210227939.2A CN201210227939A CN103533701B CN 103533701 B CN103533701 B CN 103533701B CN 201210227939 A CN201210227939 A CN 201210227939A CN 103533701 B CN103533701 B CN 103533701B
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Abstract
The present invention relates to a colour temperature control circuit and an illuminating device with the same. The illuminating device of the invention can comprise the following components: a constant-current driver, a first illuminating unit, a second illuminating unit, an input unit and a colour temperature control circuit. The first illuminating unit can have a first color temperature and furthermore is driven by the constant-current driver for generating first current which flows over the first illuminating unit. The second illuminating unit can have a second colour temperature which is different from the first colour temperature, and furthermore is driven by the constant-current driver for generating second current which flows over the second illuminating unit. The input unit can input a single-channel control signal. The colour temperature control circuit can switch on one selected from the first current and the second current based on the control signal, and simultaneously switches off the other in the first current and the second current, thereby controlling the colour temperature of the illuminating device.
Description
Technical field
It relates to the technical field of illuminator, more particularly to a kind of color temperature controlling circuit and with the colour temperature control
The illuminator of circuit processed.
Background technology
This part provides the background information relevant with the disclosure, and this is not necessarily prior art.
Colour temperature is a kind of characteristic of visible ray, and it has important application in the fields such as illumination.The colour temperature of light source is radiation
With the temperature of the ideal black body radiator of the comparable light of the tone of the light source.Different colour temperatures can be produced to the emotion or sensation of people
Different impacts.And, different occasions may need the lighting with different-colour.When the colour temperature of illumination apparatus is entered
When row changes, color temperature controlling circuit is typically complex, so as to relatively costly.
The content of the invention
This part provides the general summary of the disclosure, rather than its four corner or its whole feature are draped over one's shoulders comprehensively
Dew.
The purpose of the disclosure is to provide a kind of color temperature controlling circuit and the illuminator with the color temperature controlling circuit, its
With simple structure, and control easy to carry out, so as to significantly reduce cost.
A kind of illuminator can include constant-flow driver, the first lighting unit, the second lighting unit, input block and color
Temperature control circuit.First lighting unit can have the first colour temperature, and by constant-flow driver drive with produce flow through the first photograph
First electric current of bright unit.Second lighting unit can have the second colour temperature different from the first colour temperature, and by constant-current driving
Device drives to produce the second electric current for flowing through the second lighting unit.Input block can be input into single pass control signal.Colour temperature
Control circuit can be based on control signal, connected in the first electric current and the second electric current, and simultaneously switch off the first electric current
With another in the second electric current, to control the colour temperature of illuminator.
A kind of color temperature controlling circuit of illuminator can be based on single pass control signal, and connection is flow through in illuminator
The first lighting unit the first electric current and flow through in the second electric current of the second lighting unit in illuminator, and
Simultaneously switch off in the first electric current and the second electric current another, to control the colour temperature of illuminator.
Color temperature controlling circuit according to the disclosure and the illuminator with the color temperature controlling circuit are only with one
Constant-flow driver and single pass control signal.Therefore, illuminator can have simple structure, and control easy to carry out
System, so as to significantly reduce cost.
From describing provided herein, further suitability region will become obvious.Description in this summary and
Specific examples are intended merely to the purpose illustrated, and are not intended to limit the scope of the present disclosure.
Description of the drawings
Accompanying drawing described here is intended merely to the purpose of the signal of selected embodiment and not all possible enforcement, and not
It is intended to limit the scope of the present disclosure.In the accompanying drawings：
Fig. 1 is the block diagram of the schematic construction of the illuminator according to the disclosure；
Fig. 2 is the block diagram of the schematic construction of the color temperature controlling circuit of the illuminator according to the disclosure；
Fig. 3 is the circuit structure diagram of the illuminator according to the embodiment of the present disclosure；
Fig. 4 is the oscillogram of the voltage of the specific node in the illuminator shown in Fig. 3；And
Fig. 5 is the oscillogram of the electric current of the particular branches in the illuminator shown in Fig. 3.
Although the disclosure is subjected to various modifications and alternative forms, its specific embodiment is as an example in accompanying drawing
In illustrate, and be described in detail here.It should be understood, however, that being not intended to the description of specific embodiment by this public affairs at this
Open and be restricted to disclosed concrete form, but on the contrary, disclosure purpose be intended to cover spirit and scope of the present disclosure it
Interior all modifications, equivalent and replacement.It should be noted that running through several accompanying drawings, corresponding label indicates corresponding part.
Specific embodiment
With reference now to accompanying drawing, it is described more fully the example of the disclosure.Below description is merely exemplary in nature,
And be not intended to limit the disclosure, application or purposes.
There is provided example embodiment, so that the disclosure will become detailed, and will be abundant to those skilled in the art
Pass on its scope in ground.The example of numerous specific details such as particular elements, apparatus and method is elaborated, it is of this disclosure to provide
The detailed understanding of embodiment.To those skilled in the art it will be obvious that, it is not necessary to using specific details, example
Embodiment can be implemented with many different forms, and they shall not be interpreted to limit the scope of the present disclosure.At some
In example embodiment, well-known process, well-known structure and widely-known technique are not described in detail.
When element or layer be referred to as " being in " another element or layer " on ", " being joined to ", " being connected to " or " coupling
To " another element or during layer, it can be directly on another element or layer, be joined to, it is another to be connected or coupled to
One element or layer, or there may be element between two parties or layer.Compare with this formation, when element is referred to as " being directly in " separately
One element or layer " on ", " being directly joined to ", " being directly connected to " or when " being directly coupled to " another element or layer,
May not there is element between two parties or layer.Other wording for describing relation between element should understand in a similar manner
（For example " between " in contrast to " directly between ", " adjacent " in contrast to " direct neighbor " etc.）.As used herein, term
"and/or" includes any and whole combination of one or more in related listed items.
Although term first, second, third, etc. can with here using describe various elements, part, region, layer and/or
Section, but these elements, part, region, layer and/or section should not be limited by these terms.These terms can be only
For making a distinction to element, part, region, layer or a section and other region, layer or section.Such as " first ", " the
Two " term and other numerical terms etc does not imply that when used herein sequence or order, unless context is clearly
Indicate.Therefore, the first element discussed below, part, region, floor or section can also be expressed as the second element, part, area
Domain, layer or section, without departing from the teaching of example embodiment.
As shown in figure 1, constant-flow driver can be included according to the illuminator 100 of a specific embodiment of the disclosure
110th, the first lighting unit 120, the second lighting unit 130, input block 140 and color temperature controlling circuit 150.First lighting unit
120 can have the first colour temperature, and are driven by constant-flow driver 110 and flow through the first electric of the first lighting unit 120 to produce
Stream Im.Second lighting unit 130 can have the second colour temperature different from the first colour temperature, and be driven by constant-flow driver 110
To produce the second electric current In for flowing through the second lighting unit 130.Input block 140 can be input into single pass control signal S.Color
Temperature control circuit 150 can be based on control signal S, connected in the first electric current Im and the second electric current In, and while break
Open in the first electric current Im and the second electric current In another, to control the colour temperature of illuminator 100.
In illuminator 100 as shown in Figure 1, the first lighting unit 120 and the second lighting unit 130 are by same perseverance
Stream driver 110 drives, and is controlled by single pass control signal S.Therefore, illuminator 100 can have
Simple structure, and control easy to carry out, so as to significantly reduce cost.
This teaching is suitable for incorporation in many different types of illuminators.For exemplary purposes, below with LED
（Light Emitting Diode, light emitting diode）It is described as a example by illuminator.
LED colour temperatures refer to color when LED lights, and generally can be divided into warm white（2700K-4500K), just white (4500K-
6500K) with cool white (more than 6500K）Three kinds.The LED with different-colour can as needed be selected.After have chosen LED,
The colour temperature of the LED of selection is fixed.When needing to change the colour temperature of LED light device, it is necessary to provide and there is different-colour
At least two LED illumination units.
With reference to Fig. 1, using LED light device as the example of illuminator 100.LED light device 100 can have two
LED illumination unit.Using the first LED illumination unit with the first colour temperature such as warm white as the example of the first lighting unit 120, and
And using the second LED illumination unit with the second colour temperature such as cool white as the example of the second lighting unit 130.
It is known to those skilled in the art that if switch on if, flowing through the first electric current of the first LED illumination unit 120
Im and the second electric current In for flowing through the second LED illumination unit 130 should be constant.When the first electric current Im is connected, a LED
Lighting unit 120 can send the light with the first colour temperature.Tool can be controlled by controlling the turn-on time of the first electric current Im
There is the intensity of the light of the first colour temperature.When the second electric current In is connected, the second LED illumination unit 130 can be sent with the second color
The light of temperature.The intensity of the light with the second colour temperature can be controlled by the turn-on time of the second electric current In of control.When different strong
When the light with the first colour temperature and the light with the second colour temperature of degree is mixed in proportion, the colour temperature of LED light device 100 will
Change.
Therefore, it can control LED light device 100 by controlling the turn-on time of the first electric current Im and the second electric current In
Colour temperature.
Due to both the first electric current Im and the second electric current In connect when be required to it is constant, therefore, the first LED illumination unit
120 and second LED illumination unit 130 both be required for being driven by constant-flow driver.When respectively the first LED illumination unit 120
When arranging different constant-flow drivers with the second LED illumination unit 130, cost will increase.
Because the turn-on time of the first electric current Im and the second electric current In when the colour temperature of LED light device 100 is controlled is to receive
To control, that is, the first electric current Im and the second electric current In can switch between switching on and off, it is possible to which consideration is to the
One electric current Im and the second electric current In synchronize switching.In other words, when the first electric current Im is connected, the second electric current In disconnects, and works as
The second electric current In is connected when first electric current Im disconnects.So, it is possible to is driven using same constant-flow driver 110
Both one LED illumination unit 120 and the second LED illumination unit 130, to realize controlling the colour temperature of LED light device 100, while
Reduces cost.
Further, because the first electric current Im and the second electric current In always synchronize switching, it is possible to use single channel
Control signal to control both the first electric current Im and the second electric current In simultaneously, so as to control easy to carry out.As shown in Figure 1 is defeated
Control signal S for entering the output of unit 140 for example can be PWM（Pulsewidth modulation）Signal.When control signal S is high level, color
Temperature control circuit 150 can for example connect the first electric current Im, and simultaneously switch off the second electric current In.On the other hand, when control letter
When number S is low level, color temperature controlling circuit 150 can for example disconnect the first electric current Im, and be also turned on the second electric current In.This
Sample one, by the dutycycle for simply changing pwm signal, it is possible to control connecing for both the first electric current Im and the second electric current In
The logical time, so as to control the colour temperature of LED light device 100.
In addition, when using pwm signal as control signal S, the first electric current Im and the second electric current In be frequently switched on and
Disconnect.In order to avoid LED light device 100 produces flicker, the frequency for typically requiring pwm signal is more than 200Hz.
In order to strengthen the effect of illumination, each in the first LED illumination unit 120 and the second LED illumination unit 130 can
With including the multiple LED being connected in series.Each in multiple LED that first LED illumination unit 120 includes can have first
Each in colour temperature, and multiple LED for including of the second LED illumination unit 130 can have the second colour temperature.So,
When the first electric current Im is connected, the first LED illumination unit 120 still sends on the whole the light with the first colour temperature.When second electric
When stream In is connected, the second LED illumination unit 130 still sends on the whole the light with the second colour temperature.
Further, the number of the LED that the first LED illumination unit 120 includes can with the second LED illumination unit 130 in
Including LED number it is identical, in order to be controlled.Certainly, the number of the LED that the first LED illumination unit 120 includes
The number of the LED that the second LED illumination unit 130 includes is can be differently configured from, the disclosure does not have particular restriction to this.
The color temperature controlling circuit 150 of illuminator 100 in accordance with an embodiment of the present disclosure can be based on single pass control
Signal S, connection is flow through the first electric current Im of the first lighting unit 120 in illuminator 100 and is flow through in illuminator 100
One in second electric current In of the second lighting unit 130, and simultaneously switch off another in the first electric current Im and the second electric current In
One.Thus, it is easy to perform the control of the colour temperature of illumination apparatus 100.
As shown in Fig. 2 first switch can be included according to the color temperature controlling circuit 150 of a specific embodiment of the disclosure
Unit 151, second switch unit 152 and inverted control signal signal generating unit 153.First switch unit 151 can be by control letter
Number S control, for being switched on or switched off the first electric current Im.Inverted control signal signal generating unit 153 can be with first switch unit 151
It is connected in parallel, for generating phase place and the anti-phase inverted control signal of control signal SS.Second switch unit 152 can be by anti-phase
Control signalSControl, for being switched on or switched off the second electric current In.
First switch unit 151 and second switch unit 152 can adopt identical structure.So, due to first
Switch element 151 and second switch unit 152 are simultaneously respectively by control signal S and inverted control signalSControl, it is possible to real
Now when the first electric current Im is connected, the second electric current In disconnects, and the second electric current In is connected when the first electric current Im disconnects.
Still using pwm signal as the example of control signal S.For example when pwm signal S is high level, first switch list
Unit 151 connects the first electric current Im, so as to allow the first lighting unit 120 to send the light with the first colour temperature.Now, open with first
The inverted control signal signal generating unit 153 that pass unit 151 is connected in parallel is generated has low level inverted control signalS.Second
Switch element 152 is in low level inverted control signalSControl under disconnect the second electric current In, so as to not allow the second illumination list
Unit 130 lights.
On the other hand, when pwm signal S is low level, first switch unit 151 disconnects the first electric current Im, so as to not permit
Perhaps the first lighting unit 120 lights.Now, inverted control signal signal generating unit 153 generates the anti-phase control with high level and believes
NumberS.Inverted control signal of the second switch unit 152 in high levelSControl under connect the second electric current In, so as to allow second
Lighting unit 130 sends the light with the second colour temperature.
By the dutycycle for changing pwm signal, the turn-on time of the first electric current Im and the second electric current In can be controlled, so as to
The intensity and the intensity of the light with the second colour temperature of light of the control with the first colour temperature.When varying strength is with the first colour temperature
When light and the light with the second colour temperature are mixed in proportion, the colour temperature of illuminator 100 will change.
Below by taking LED light device as an example, describe in detail with reference to Fig. 3 according to the embodiment of the present disclosure with colour temperature control
The LED light device 100 of circuit processed 150.Fig. 3 is the circuit structure diagram of the LED light device 100 according to the embodiment of the present disclosure.
As shown in figure 3, the first LED illumination unit 120 has multiple the LED D1, D2 ... ..., Dm being connected in series.Here,
The negative electrode of LED D1 is connected to node 2 to be connected to color temperature controlling circuit 150, and the anode of LED D1 is connected to LED D2's
Negative electrode.Further, while the negative electrode in LEDD2 is connected to the anode of LED D1, the anode of LED D2 is connected to LED D3's
Negative electrode, etc..Finally, the negative electrode of LED Dm is connected to the anode of LED Dm-1, and the anode of LED Dm is connected to constant current drive
Dynamic device 110.
Similarly, the second LED illumination unit 130 has multiple the LED D1, D2 ... ..., Dn being connected in series.Here, LED
The negative electrode of D1 is connected to node 5 to be connected to color temperature controlling circuit 150, and the anode of LED D1 is connected to the moon of LED D2
Pole.Further, while the negative electrode in LEDD2 is connected to the anode of LED D1, the anode of LED D2 is connected to the moon of LED D3
Pole, etc..Finally, the negative electrode of LED Dn is connected to the anode of LED Dn-1, and the anode of LED Dn is connected to constant-current driving
Device 110.
In LED light device 100 as shown in Figure 3, the number Dm of the LED that the first LED illumination unit 120 includes with
The number Dn of the LED that the second LED illumination unit 130 includes is identical.
As seen from Figure 3, constant-flow driver 110 can produce constant electric current Io.First LED illumination list
Both the LED illumination unit 130 of unit 120 and second is driven by constant-flow driver 110.The electric current Io of the generation of constant-flow driver 110,
The the first electric current Im for flowing through the first LED illumination unit 120 and the second electric current In for flowing through the second LED illumination unit 130 have such as
Lower relation：
Io=Im+In （1）
Based on control signal S that input block 140 is exported, color temperature controlling circuit 150 can connect the first electric current Im and the
One in two electric current In, and simultaneously switch off another in the first electric current Im and the second electric current In.For example, when the first electric current
When Im is connected and the second electric current In disconnects, In=0, therefore Im=Io.On the other hand, when the first electric current Im disconnects and second is electric
When stream In is connected, Im=0, therefore In=Io.
It is single that color temperature controlling circuit 150 can include that first switch unit, second switch unit and inverted control signal are generated
Unit.Specifically as shown in figure 3, first switch unit can be included as a MOSFET（Metal-Oxide-
Semiconductor Field-Effect Transistor, Metal-oxide-semicondutor-field-effect transistor）Device
MOSFET element Q1.Inverted control signal signal generating unit can include resistor R and the Zener diode D being connected in series.Second
Switch element can include MOSFET element Q2 as the second MOSFET element.
The color temperature controlling circuit 150 being made up of MOSFET element Q1 and Q2, resistor R and Zener diode D has simple
Structure, such that it is able to control LED light device 100 colour temperature while significantly reduce cost.
Specifically, as shown in figure 3, the drain electrode of MOSFET element Q1 is connected to node 2 to be connected to the first LED illumination unit
The negative electrode of the LED D1 in 120, the source electrode of MOSFET element Q1 is connected to node 4 to be grounded, and the grid of MOSFET element Q1
Pole is connected to node 1 to be controlled by control signal S.
Further, one end of resistor R is connected to node 2 to be connected to the drain electrode of MOSFET element Q1, and resistor R's is another
One end is connected to node 3 to be connected to the negative electrode of Zener diode D, and the anode of Zener diode D is connected to node 4 to connect
Ground.
Further, the LED during the drain electrode of MOSFET element Q2 is connected to node 5 to be connected to the second LED illumination unit 130
The negative electrode of D1, the source electrode of MOSFET element Q2 is connected to node 4 to be grounded, and the grid of MOSFET element Q2 is connected to node
3 being connected to the negative electrode of Zener diode D.
By taking pwm signal as an example, the work of LED light device 100 as shown in Figure 3 is described in detail with reference to Figure 4 and 5
Make principle.Figure 4 and 5 respectively illustrate the specific node and the voltage and current of branch road of LED light device 100 as shown in Figure 3
Oscillogram.
Input block 140 can be using output pwm signal as control signal S.When pwm signal S is high level, MOSFET devices
The voltage Vgs1 between voltage that is, node 1 and 4 between the grid and source electrode of part Q1 is high level.
Because Vgs1 is high level, so the drain current Idrain1 conductings of MOSFET element Q1.In figure 3, can recognize
Drain current Idrain1 for MOSFET element Q1 is equal with the first electric current Im for flowing through the first LED illumination unit 120.In addition,
Electricity when MOSFET element Q1 is connected, between the voltage between the drain electrode of MOSFET element Q1 and source electrode that is, node 2 and 4
Pressure Vds1 is low level.
Because Vds1 is low level, and node 4 is grounded, so the voltage at node 2 is also low level.So,
Voltage at node 3 is low level.In other words, the anti-phase control letter being made up of the resistor R and Zener diode D that are connected in series
Number signal generating unit is generated with low level inverted control signal at node 3, its phase place and the pwm signal with high level
S is anti-phase.
Because the inverted control signal from node 3 is low level, so between the grid and source electrode of MOSFET element Q2
Voltage that is, node 3 and 4 between voltage Vgs2 be low level.
Because Vgs2 is low level, so the drain current Idrain2 cut-offs of MOSFET element Q2.From the figure 3, it may be seen that
The drain current Idrain2 of MOSFET element Q2 is equal with the second electric current In for flowing through the second LED illumination unit 130.In addition, working as
When MOSFET element Q2 is ended, the voltage between the voltage between the drain electrode of MOSFET element Q2 and source electrode that is, node 5 and 4
Vds2 is high level.
Due to the cut-off of MOSFET element Q2, so Idrain2=In=0.Therefore, from the equations above（1）Understand,
Idrain1=Im=Io.In other words, when pwm signal S is high level, the first electric current Im is connected, and while the second electric current In is disconnected
Open.Therefore, the first LED illumination unit 120 will send the light with the first colour temperature.
On the other hand, when pwm signal S be low level when, the voltage between the grid and source electrode of MOSFET element Q1 that is,
Voltage Vgs1 between node 1 and 4 is low level.
Because Vgs1 is low level, so the drain current Idrain1 cut-offs of MOSFET element Q1.In addition, working as MOSFET
When device Q1 ends, the voltage Vds1 between the voltage between the drain electrode of MOSFET element Q1 and source electrode that is, node 2 and 4 is
High level.
When Vds1 is high level, the voltage at node 2 is also high level.Now, resistor R can play current limliting and drive
Dynamic effect, and Zener diode D can play a part of clamper and voltage stabilizing.Therefore, the voltage at node 3 can be maintained
In high level.In other words, inverted control signal signal generating unit generates the inverted control signal with high level at node 3,
Its phase place is anti-phase with low level pwm signal S.
Because the inverted control signal from node 3 is high level, so between the grid and source electrode of MOSFET element Q2
Voltage that is, node 3 and 4 between voltage Vgs2 be high level.
Because Vgs2 is high level, so the drain current Idrain2 conductings of MOSFET element Q2.In addition, working as MOSFET
When device Q2 is connected, the voltage Vds2 between the voltage between the drain electrode of MOSFET element Q2 and source electrode that is, node 5 and 4 is
Low level.
Due to the cut-off of MOSFET element Q1, so Idrain1=Im=0.In view of above formula（1）Understand, Idrain2
=In=Io.In other words, when pwm signal S is low level, the first electric current Im disconnects, and while the second electric current In is connected.Cause
This, the second LED illumination unit 130 will send the light with the second colour temperature.
The intensity of the light that can control there is the first colour temperature by controlling the turn-on time of the first electric current Im, and can be with
By the intensity for controlling the turn-on time of the second electric current In to control the light with the second colour temperature.When varying strength is with first
When the light of colour temperature and the light with the second colour temperature are mixed in proportion, the colour temperature of LED light device 100 will change.
As set forth above, it is possible to control the connection of the first electric current Im by the persistent period of the high level for controlling pwm signal S
Time, and the turn-on time of the second electric current In can be controlled by the low level persistent period of control pwm signal S.Change
Yan Zhi, can control the turn-on time of both the first electric current Im and the second electric current In by the dutycycle of change pwm signal S,
So as to change the colour temperature of LED light device 100.
In superincumbent description, it is believed that the drain current Idrain1 of MOSFET element Q1 with flow through the first LED illumination unit
120 the first electric current Im is equal.It should be noted that anti-due to what is be made up of the resistor R and Zener diode D that are connected in series
Phase control signal generation unit is connected in parallel with MOSFET element Q1, so in theory, the first electric current Im is equal to drain current
Idrain1 and the electric current sum for flowing through inverted control signal signal generating unit.However, when MOSFET element Q1 is connected, MOSFET
The voltage Vds1 between voltage that is, node 2 and 4 between the drain electrode of device Q1 and source electrode is low level, therefore can be caused neat
The diode D that receives ends.Now, the electric current for flowing through inverted control signal signal generating unit is zero.On the other hand, when MOSFET element Q1
During cut-off, the voltage Vds1 between voltage that is, node 2 and 4 between the drain electrode of MOSFET element Q1 and source electrode is high level,
Therefore the electric current for flowing through inverted control signal signal generating unit is not zero.Electricity due to then flowing through inverted control signal signal generating unit
Stream is primarily to drive MOSFET element Q2, therefore the hereinafter referred to as driving current of MOSFET element Q2.With driving first
The electric current Io that LED illumination unit 120 is produced with the constant-flow driver 110 of the second LED illumination unit 130 is compared, MOSFET element
The driving current of Q2 is very little, so that being negligible.It is therefore contemplated that the drain current of MOSFET element Q1
Idrain1 is equal with the first electric current Im for flowing through the first LED illumination unit 120.
Particular embodiments disclosed above is only illustrative, because the disclosure can be being added with different but equivalent modes
To change and put into practice, these modes are obvious for those skilled in the art of benefit taught herein are obtained.Further,
In addition to those for describing in the following claims, it is therefore intended that construction or the details of design that restriction is shown in which.Cause
This, it will therefore be apparent that particular embodiments disclosed above can be altered or modified, and all such changes are considered as being in
Within the scope of the present disclosure and spirit.
Claims (11)
1. a kind of illuminator, including：
Constant-flow driver；
First lighting unit, it has the first colour temperature, and flows through first photograph to produce by constant-flow driver driving
First electric current of bright unit；
Second lighting unit, it has the second colour temperature different from first colour temperature, and is driven by the constant-flow driver
To produce the second electric current for flowing through second lighting unit；
Input block, for being input into single pass control signal；And
Color temperature controlling circuit, for being based on the control signal, connected in first electric current and second electric current,
And simultaneously switch off in first electric current and second electric current another, to control the colour temperature of the illuminator,
Wherein, the control signal is pulse-width signal, and
The color temperature controlling circuit includes：
First switch unit, it is controlled by the control signal, for being switched on or switched off first electric current；
Inverted control signal signal generating unit, it is connected in parallel with the first switch unit, for generating phase place with the control
The inverted control signal of signal inversion；And
Second switch unit, it is controlled by the inverted control signal, for being switched on or switched off second electric current.
2. illuminator according to claim 1, wherein, the first switch unit includes the first MOSFET element, institute
State resistor and Zener diode that inverted control signal signal generating unit includes being connected in series, and the second switch unit bag
Include the second MOSFET element.
3. illuminator according to claim 2, wherein,
The drain electrode of first MOSFET element is connected to first lighting unit, and the source electrode of first MOSFET element connects
Ground, and the grid of first MOSFET element controls by the control signal,
One end of the resistor is connected to the drain electrode of first MOSFET element, and the other end of the resistor is connected to institute
The negative electrode of Zener diode, and the plus earth of the Zener diode are stated, and
The drain electrode of second MOSFET element is connected to second lighting unit, and the source electrode of second MOSFET element connects
Ground, and the grid of second MOSFET element is connected to the negative electrode of the Zener diode.
4. illuminator according to claim 1, wherein, controlled by changing the dutycycle of the control signal described
The colour temperature of illuminator.
5. illuminator according to claim 1, wherein, the frequency of the control signal is more than 200Hz.
6. illuminator according to claim 1, wherein, in first lighting unit and second lighting unit
Each includes the multiple light emitting diodes being connected in series.
7. illuminator according to claim 6, wherein, the number of the light emitting diode that first lighting unit includes
Mesh is identical with the number of the light emitting diode that second lighting unit includes.
8. a kind of color temperature controlling circuit of illuminator, for based on single pass control signal, connecting the illumination dress is flow through
First electric current of the first lighting unit put and flow through in the second electric current of the second lighting unit in the illuminator
One, and another in first electric current and second electric current is simultaneously switched off, to control the illuminator
Colour temperature,
Wherein, the control signal is pulse-width signal,
The color temperature controlling circuit includes：
First switch unit, it is controlled by the control signal, for being switched on or switched off first electric current；
Inverted control signal signal generating unit, it is connected in parallel with the first switch unit, for generating phase place with the control
The inverted control signal of signal inversion；And
Second switch unit, it is controlled by the inverted control signal, for being switched on or switched off second electric current.
9. color temperature controlling circuit according to claim 8, wherein, the first switch unit includes a MOSFET devices
Part, the inverted control signal signal generating unit includes resistor and the Zener diode being connected in series, and the second switch
Unit includes the second MOSFET element.
10. color temperature controlling circuit according to claim 9, wherein,
The drain electrode of first MOSFET element is connected to first lighting unit, and the source electrode of first MOSFET element connects
Ground, and the grid of first MOSFET element controls by the control signal,
One end of the resistor is connected to the drain electrode of first MOSFET element, and the other end of the resistor is connected to institute
The negative electrode of Zener diode, and the plus earth of the Zener diode are stated, and
The drain electrode of second MOSFET element is connected to second lighting unit, and the source electrode of second MOSFET element connects
Ground, and the grid of second MOSFET element is connected to the negative electrode of the Zener diode.
11. color temperature controlling circuits according to claim 8, wherein, controlled by changing the dutycycle of the control signal
Make the colour temperature of the illuminator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210227939.2A CN103533701B (en) | 2012-07-02 | 2012-07-02 | Colour temperature control circuit and illuminating device with the same |
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| CN201210227939.2A CN103533701B (en) | 2012-07-02 | 2012-07-02 | Colour temperature control circuit and illuminating device with the same |
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| CN103533701A CN103533701A (en) | 2014-01-22 |
| CN103533701B true CN103533701B (en) | 2017-04-19 |
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| US10034346B2 (en) | 2016-04-27 | 2018-07-24 | Lumileds Llc | Dim to warm controller for LEDs |
| JP6744428B2 (en) * | 2016-04-27 | 2020-08-19 | ルミレッズ リミテッド ライアビリティ カンパニー | Warm color dimming controller for LED |
| CN110087365A (en) * | 2019-05-24 | 2019-08-02 | 深圳迪亚士照明科技有限公司 | A kind of brightness colour temperature synchronous adjustment flexible LED lamp bar circuit and soft light bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370035A (en) * | 2001-02-08 | 2002-09-18 | 精工电子有限公司 | LED drive circuit |
| CN101657876A (en) * | 2007-04-13 | 2010-02-24 | 英特曼帝克司公司 | Color temperature tunable white light source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1370035A (en) * | 2001-02-08 | 2002-09-18 | 精工电子有限公司 | LED drive circuit |
| CN101657876A (en) * | 2007-04-13 | 2010-02-24 | 英特曼帝克司公司 | Color temperature tunable white light source |
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