CN109152122A - A kind of LED color temperature adjusting method and LED colour temperature adjusts circui - Google Patents
A kind of LED color temperature adjusting method and LED colour temperature adjusts circui Download PDFInfo
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- CN109152122A CN109152122A CN201710464563.XA CN201710464563A CN109152122A CN 109152122 A CN109152122 A CN 109152122A CN 201710464563 A CN201710464563 A CN 201710464563A CN 109152122 A CN109152122 A CN 109152122A
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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]
- H05B45/20—Controlling the colour of the light
Abstract
Disclose a kind of LED color temperature adjusting method and LED colour temperature adjusts circui.At least two pulse signals of pulse-generating circuit output are received by LED parallel circuit, and according at least two pulse signals, conducting is switched over at least two branches in LED parallel circuit, to adjust the electric current for flowing through the corresponding at least two branch roads in a cycle in LED parallel circuit, LED parallel circuit is made to obtain different colour mixture colour temperatures in light mixing.
Description
Technical field
This application involves electronic technology field more particularly to a kind of LED color temperature adjusting method and LED colour temperature adjusts circuis.
Background technique
In field of LED drive, user can reach the different colour temperature of LED light by different switching modes, can be with
The referred to as switching of colour temperature.
Such as the switching of colour temperature can may be implemented by the on-off times of switch on wall, realize cold light-warm light-light mixing etc.
Transfer sequence.There are two-way or even LED multi-path inside usual LED light, a kind of colour temperature is presented in single LED, and cool colour or warm is presented
Color.When first switching on switch, only one paths of LEDs of cold light shines, then cool colour is presented in entire lamp；It is turned on the switch when for the second time
When, only one paths of LEDs of warm colour shines, then warm colour is presented in lamp；When being again turned on switch, then two paths of LED all shines, and entire lamp is in
Existing light mixing, for colour temperature between cold light and warm light, the intensity of colour temperature depends on flowing through the ratio of cold light LED and warm light LED current.
In existing colour temperature switching product, in the design circuit of light mixing, the current ratio for flowing through two-way is 1:1.Such as
Shown in Fig. 1, S1 and S2 are switches, and LED1 is cold light lamp, and LED2 is warm light lamp, and it is solid that IL, which is the output electric current of driving power,
Definite value.It can be seen from the figure that the sum of average current of LED1 and LED2 is flowed through when light mixing is equal to IL, as shown in Figure 2 A, when
When the forward conduction voltage of LED2 and the equal forward conduction voltage of LED1, then flows through the electric current of LED1 and flow through the electricity of LED2
It flows equal.
However, the deviation of the manufacture craft of each LED, the forward conduction voltage of each LED can also change accordingly.Mixed
In the actual circuit of light, there is inconsistent phenomenon in the LED voltage of cold light and the LED voltage of warm light, flow through two-way electric current at this time
Not equal to 1:1, the deviation of color temperature of mixed light is caused.As shown in Figure 2 B, when the forward conduction of the forward conduction voltage ratio LED1 of LED2
When voltage is slightly higher, the electric current for then flowing through LED1 is larger, and the electric current for flowing through LED2 is smaller, i.e., flows through two-way electric current at this time and be not equal to
1:1 causes the deviation of color temperature of mixed light, reduces user experience.
Summary of the invention
This application provides a kind of LED color temperature adjusting methods and LED colour temperature adjusts circui.It is exported by pulse-generating circuit
At least two pulse signals, control LED parallel circuit in LED branch switch over conducting operation, thus control flow through LED
The electric current of corresponding at least two LED branch roads, makes LED parallel circuit obtain different colour mixture colors in light mixing in parallel circuit
Temperature.
In a first aspect, providing a kind of LED color temperature adjusting method, this method may include: that reception pulse-generating circuit is defeated
At least two pulse signals out.According at least two pulse signals, at least two branches in LED parallel circuit are cut
Conducting is changed, to adjust the electric current for flowing through corresponding at least two branch roads in a cycle in LED parallel circuit.
In an optional realization, according at least two pulse signals, at least two branches in LED parallel circuit
Switch over conducting, comprising: in the first preset time, the first pulse signal control LED at least two pulse signals is simultaneously
Join respective branch at least two branches of circuit to be connected, the pulse letter at least two pulse signals in addition to the first pulse signal
Number control LED parallel circuit at least two branches in respective branch disconnect.In the second preset time, at least two pulses letter
Respective branch conducting at least two branches of the second pulse signal control LED parallel circuit in number, at least two pulses letter
Respective branch disconnects at least two branches of pulse signal control LED parallel circuit in number in addition to the second pulse signal.?
In N preset time, at least two articles of branches of the N pulse signal control LED parallel circuit at least two pulse signals
Respective branch is connected, and the pulse signal control LED parallel circuit at least two pulse signals in addition to N pulse signal is at least
Respective branch disconnects in two branches, wherein N is integer greater than 0, N number of preset time and be a cycle.
In an optional realization, at least two pulse signals of pulse-generating circuit output are received, comprising: receive arteries and veins
Rush the first pulse signal and the second pulse signal of generation circuit output.According at least two pulse signals, to LED parallel circuit
In at least two branches switch over conducting, comprising: in the first preset time, the first pulse signal controls LED electricity in parallel
The first branch is connected in road；Second pulse signal controls second branch in LED parallel circuit and disconnects.In the second preset time,
First pulse signal controls the first branch in LED parallel circuit and disconnects, and the second pulse signal controls in LED parallel circuit second
Road conducting, wherein the first preset time and the second preset time and be a cycle.
In an optional realization, the time span of the first preset time is identical as the time span of the second preset time
Or it is different.When the time span of first time is identical as the time span of the second time, the electric current and stream of the first branch are flowed through
Cross the ratio 1 of the electric current of second branch.
In an optional realization, the first pulse signal is contrary with the second pulse signal.
Second aspect, provides a kind of LED colour temperature adjusts circui, which may include that LED parallel circuit and pulse produce
Raw circuit, LED parallel circuit receive at least two pulse signals of pulse-generating circuit output.LED parallel circuit is according at least
Two pulse signals adjust the electric current for flowing through corresponding at least two branch roads in a cycle in LED parallel circuit.
In an optional realization, LED parallel circuit is specifically used in the first preset time, according at least two
The first pulse signal in pulse signal, respective branch conducting at least two branches of LED parallel circuit, and according at least two
Pulse signal in a pulse signal in addition to the first pulse signal, respective branch is disconnected at least two branches of LED parallel circuit
It opens.
In the second preset time, according to the second pulse signal at least two pulse signals, LED parallel circuit is extremely
Respective branch conducting in few two branches, and according to the pulse signal at least two pulse signals in addition to the second pulse signal,
Respective branch disconnects at least two branches of LED parallel circuit.
In N preset time, according to the N pulse signal at least two pulse signals, LED parallel circuit is at least
Respective branch is connected in two branches, and according to the pulse signal at least two pulse signals in addition to N pulse signal, LED
Respective branch disconnects at least two branches of parallel circuit, wherein N is integer greater than 0, N number of preset time and be one
A period.
In an optional realization, LED parallel circuit is also used to receive the first pulse letter of pulse-generating circuit output
Number with the second pulse signal；In the first preset time, according to the first pulse signal, the first branch is connected in LED parallel circuit；
According to the second pulse signal, second branch is disconnected in LED parallel circuit.In the second preset time, according to the first pulse signal,
The first branch disconnects in LED parallel circuit.According to the second pulse signal, second branch is connected in LED parallel circuit, wherein the
One preset time and the second preset time and be a cycle.
In an optional realization, the time span of the first preset time is identical as the time span of the second preset time
Or it is different.When the time span of first time is identical as the time span of the second time, the electric current and stream of the first branch are flowed through
The ratio for crossing the electric current of second branch is 1.
In an optional realization, the first pulse signal is contrary with the second pulse signal.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described.
Fig. 1 is a kind of simplified structure diagram of colour temperature adjusts circui；
Fig. 2A is the electric current coordinate diagram that Fig. 1 flows through two paths of LED when two paths of LED forward conduction voltage drop is identical；
Fig. 2 B is the electric current coordinate diagram that Fig. 1 does not flow through two paths of LED in two paths of LED forward conduction voltage drop simultaneously；
Fig. 3 is a kind of method flow diagram of LED color temperature adjustment provided in an embodiment of the present invention；
Fig. 4 is a kind of method flow diagram of LED color temperature adjustment provided in an embodiment of the present invention；
Fig. 5 is the current waveform schematic diagram of circuit output shown in Fig. 4；
Fig. 6 is a kind of structural schematic diagram of LED colour temperature adjusts circui provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of pulse signal generating circuit provided in an embodiment of the present invention；
Fig. 8 is the waveform diagram of circuit shown in Fig. 7.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
At least two pulse signals that LED color temperature adjusting method provided by the present application is exported by pulse-generating circuit, control
LED branch in LED parallel circuit processed switches over conducting operation, so that control is flowed through corresponding at least two in LED parallel circuit
The electric current of LED branch road flows through at least two as controlled the electric current equal (flowing) for flowing through at least two LED branch roads or control
The electric current of LED branch road is unequal, to make LED parallel circuit obtain different colour mixture colour temperatures in light mixing.
Fig. 3 is a kind of method flow diagram of LED color temperature adjustment provided in an embodiment of the present invention.As shown in figure 4, this method can
To include:
Step 310, LED parallel circuit receive pulse-generating circuit output at least two.
LED parallel circuit may include at least two LED branches, and every LED branch receives a pulse signal, i.e., each
Pulse signal controls a LED branch.LED parallel circuit may include at least two LED branches.
In one example, LED parallel circuit can be with as shown in Figure 1, the circuit may include two LED branches, and every
Branch road may include the controllable switch for controlling branch conducting with closing, and such as S1 and S2, for filtering, IL is capacitor C
The output electric current of driving power.
Wherein, controllable switch S1 and controllable switch S2 controls the on-off of corresponding LED branch by return pulse signal.
Step 320, according at least two pulse signals, at least two branches in LED parallel circuit are switched over and are led
It is logical, to adjust the electric current for flowing through corresponding at least two branch roads in a cycle in LED parallel circuit.
In the first preset time, the first pulse signal control LED parallel circuit at least two pulse signals is extremely
Respective branch is connected in few two branches, and the pulse signal at least two pulse signals in addition to the first pulse signal controls LED
Respective branch disconnects at least two branches of parallel circuit.
In the second preset time, the second pulse signal control LED parallel circuit at least two pulse signals is extremely
Respective branch is connected in few two branches, and the pulse signal at least two pulse signals in addition to the second pulse signal controls LED
Respective branch disconnects at least two branches of parallel circuit.
In N preset time, the N pulse signal control LED parallel circuit at least two pulse signals is at least
Respective branch is connected in two branches, and the pulse signal control LED at least two pulse signals in addition to N pulse signal is in parallel
Respective branch disconnects at least two branches of circuit.Wherein, N is integer greater than 0, N number of preset time and be a week
Phase.
Optionally, the duration of each preset time can be similar and different in N number of preset time.It should be noted that every
The duration of a preset time is determined by the duty ratio of pulse signal, by changing the duty ratio of pulse signal, arbitrary proportion
Adjust the electric current for flowing through LED branch.
In one example, LED parallel circuit receives the first pulse signal and the second pulse of pulse-generating circuit output
Signal.Wherein, the first pulse signal is contrary with the second pulse signal, as shown in Figure 4.
In the first preset time, the first pulse signal controls S1 branch conducting in LED parallel circuit, then flows through LED1
Electric current be IL.Second pulse signal controls S2 branch in LED parallel circuit and disconnects, and the electric current for then flowing through LED2 is 0.
In the second preset time, the first pulse signal controls S1 branch in LED parallel circuit and disconnects, and then flows through LED1
Electric current be 0；Second pulse signal controls S2 branch conducting in LED parallel circuit, and the electric current for then flowing through LED2 is IL.Its
In, the first preset time and the second preset time and be a cycle.
The next period circuits sequentially, such as in the first preset time situation identical with the duration of the second preset time, stream
The average current for crossing two-way is that IL/2 is realized and flowed as shown in figure 5, the ratio for flowing through the electric current of two-way is also 1:1.Such as exist
In the case that the duration ratio of first preset time and the second preset time is 2:3, the ratio for flowing through the electric current of two-way is also 2:
3, result in the colour mixture colour temperature for being different from flowing.
It is thus understood that it is unrelated with its respective forward conduction voltage with the electric current of LED2 to flow through LED1.
Corresponding with the above method, the embodiment of the present invention also provides a kind of LED colour temperature adjusts circui.As shown in fig. 6, the electricity
Road may include LED parallel circuit and pulse-generating circuit.Pulse-generating circuit, for exporting control LED parallel circuit extremely
Few two pulse signals.LED parallel circuit, at least two pulse signals exported for receiving pulse-generating circuit, and according to
At least two pulse signals adjust the electric current that corresponding at least two LED branch roads are flowed through in a cycle.
In one example, pulse-generating circuit may include comparator, phase inverter, resistance Rm, as shown in Figure 7.Compare
The first input end of device accesses reference voltage Vref, and the second input terminal of comparator accesses input voltage (such as triangle wave voltage
Vramp), the output end of comparator is connected with the input terminal of phase inverter, while being connected with the controlled end of controllable switch S1, phase inverter
Output end be connected with controllable switch S2 controlled end.
Wherein, Vramp is a triangle wave voltage, frequency f, crest voltage Vpeak, low-voltage 0.Iref is stream
Reference current through Rm, i.e. Vref=Iref*Rm.
In waveform diagram shown in Fig. 8, when Vramp rises to Vref, the first pulse signal PWM1 is switched to 0 by 1, together
When the second pulse signal PWM2 by 0 be switched to 1.Cycle T=1/f of Vramp, that is to say, that in one cycle, Vramp's
Voltage can be expressed as Vramp=k*t (0 < t≤T), the constant that k is, the pulse letter as Vramp=Vref, in comparator
Number overturning (PWM1 is switched to 0 by 1, while 1) PWM2 is switched to by 0, therefore it is Ton=Vref/k that PWM1, which is the high time,.
Since cycle T can be expressed as Vpeak/k, the duty ratio D of PWM1 can be expressed as Ton/T or Vref/
Vpeak or Iref*Rm/Vpeak.
It can thus be seen that the duty ratio D of a pulse signal can be adjusted by the resistance value of Rm.By adjusting pulse
The duty ratio of signal.
Optionally, the duty ratio of pulse signal determines the duration of preset time.
When pulse signal includes the first pulse signal and the second pulse signal, the duty ratio of the first pulse signal is determined
First preset time, the duty ratio of the second pulse signal determine the second preset time.
In the first preset time, according to the first pulse signal, the first branch is connected in LED parallel circuit；According to second
Pulse signal, second branch disconnects in LED parallel circuit；In the second preset time, according to the first pulse signal, LED is in parallel
The first branch disconnects in circuit；According to the second pulse signal, second branch is connected in LED parallel circuit.
The next period circuits sequentially, such as in the first preset time situation identical with the duration of the second preset time, stream
The ratio for crossing the electric current of two-way is 1:1, realizes and flows.Such as the first preset time and the second preset time duration ratio not
In the case where for 1:1, the ratio for flowing through the electric current of two-way is also not 1:1, results in the colour mixture colour temperature for being different from flowing.
It should be noted that above-described embodiment is the generation for illustrating pulse signal by taking resistance and triangular wave as an example, however it is real
It is not limited to resistance and triangular wave in border, is also possible to other arbitrary pulse-generating circuits.The arteries and veins that pulse-generating circuit generates
It rushes signal and is also possible to random waveform in addition to square wave, such as triangular wave and sawtooth wave.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software instruction can be made of corresponding software module, and software module can be by
Deposit in random access memory, flash memory, read-only memory, erasable programmable read-only register (erasable
Programmable read-only memory, EPROM) memory, Electrically Erasable Programmable Read-Only Memory memory
(electrically erasable programmable read-only memory, EEPROM), hard disk, CD or sheet
In the storage medium of any other form known to field.A kind of illustrative storage medium is coupled to processor, to make to locate
Managing device can be from the read information, and information can be written to the storage medium.Certainly, storage medium is also possible to locate
Manage the component part of device.Certainly, pocessor and storage media can also be used as discrete assembly and be present in user equipment.
Those skilled in the art are it will be appreciated that in said one or multiple examples, function described herein
It can be realized with hardware, software, firmware or their any combination.It, can be by these when being realized using software, firmware
Function stores in computer-readable medium.
Above-described specific embodiment has carried out further the purpose of the application, technical scheme and beneficial effects
It is described in detail, it should be understood that being not used to limit the application the foregoing is merely the specific embodiment of the application
Protection scope, all any modification, improvement etc. on the basis of the technical solution of the application, made should all be included in this
Within the protection scope of application.
Claims (10)
1. a kind of LED color temperature adjusting method, which is characterized in that the described method includes:
Receive at least two pulse signals of pulse-generating circuit output；
According at least two pulse signal, conducting is switched over at least two branches in LED parallel circuit, to adjust
The electric current of the corresponding at least two branch roads is flowed through in a cycle in LED parallel circuit.
2. the method according to claim 1, wherein described according at least two pulse signal, simultaneously to LED
At least two branches in connection circuit switch over conducting, comprising:
In the first preset time, the first pulse signal at least two pulse signal controls the LED parallel circuit
At least two branches in respective branch conducting, the pulse at least two pulse signal in addition to first pulse signal
Signal controls respective branch at least two branches of the LED parallel circuit and disconnects；
In the second preset time, the second pulse signal at least two pulse signal controls the LED parallel circuit
At least two branches in respective branch conducting, the pulse at least two pulse signal in addition to second pulse signal
Signal controls respective branch at least two branches of the LED parallel circuit and disconnects；
In N preset time, the N pulse signal at least two pulse signal controls the LED parallel circuit
Respective branch is connected at least two branches, the pulse letter at least two pulse signal in addition to the N pulse signal
Respective branch disconnects at least two branches of number control LED parallel circuit, wherein N is the integer greater than 0, N number of default
Time and be a cycle.
3. method according to claim 1 or 2, which is characterized in that described to receive at least the two of pulse-generating circuit output
A pulse signal, comprising:
Receive the first pulse signal and the second pulse signal of the pulse-generating circuit output；
It is described that conducting is switched over at least two branches in LED parallel circuit according at least two pulse signal, packet
It includes:
In the first preset time, first pulse signal controls first branch conducting in the LED parallel circuit；Described
Two pulse signals control second branch in the LED parallel circuit and disconnect；
In the second preset time, first pulse signal controls the first branch in the LED parallel circuit and disconnects；Described
Two pulse signals control second branch conducting in the LED parallel circuit, wherein first preset time is pre- with described second
If the time and be a cycle.
4. according to the method described in claim 3, it is characterized in that, the time span of first preset time and described second
The time span of preset time is identical or different；
When the time span of the first time is identical as the time span of second time, the first branch is flowed through
The ratio 1 of electric current and the electric current for flowing through the second branch.
5. according to the method described in claim 3, it is characterized in that, first pulse signal and second pulse signal
It is contrary.
6. a kind of LED colour temperature adjusts circui, which is characterized in that the circuit includes LED parallel circuit and pulse-generating circuit,
The LED parallel circuit receives at least two pulse signals of the pulse-generating circuit output；
The LED parallel circuit is adjusted in a cycle and is flowed in the LED parallel circuit according at least two pulse signal
Cross the electric current of the corresponding at least two branch roads.
7. circuit according to claim 6, which is characterized in that the LED parallel circuit is specifically used for when first is default
In, according to the first pulse signal at least two pulse signal, at least two branches of the LED parallel circuit
Respective branch conducting, and according to the pulse signal at least two pulse signal in addition to first pulse signal, it is described
Respective branch disconnects at least two branches of LED parallel circuit；
In the second preset time, according to the second pulse signal at least two pulse signal, the LED parallel circuit
At least two branches in respective branch conducting, and according at least two pulse signal in addition to second pulse signal
Pulse signal, respective branch disconnects at least two branches of the LED parallel circuit；
In N preset time, according to the N pulse signal at least two pulse signal, the LED parallel circuit
In at least two branches respective branch be connected, and according at least two pulse signal in addition to the N pulse signal
Pulse signal, respective branch disconnects at least two branches of the LED parallel circuit, wherein N is the integer greater than 0, N number of
Preset time and be a cycle.
8. circuit according to claim 6 or 7, which is characterized in that the LED parallel circuit is also used to receive the arteries and veins
Rush the first pulse signal and the second pulse signal of generation circuit output；
In the first preset time, according to first pulse signal, the first branch is connected in the LED parallel circuit；According to
Second pulse signal, second branch disconnects in the LED parallel circuit；
In the second preset time, according to first pulse signal, the first branch is disconnected in the LED parallel circuit；According to
Second pulse signal, second branch conducting in the LED parallel circuit, wherein first preset time and described the
Two preset times and be a cycle.
9. circuit according to claim 8, which is characterized in that the time span of first preset time and described second
The time span of preset time is identical or different；
When the time span of the first time is identical as the time span of second time, the first branch is flowed through
The ratio of electric current and the electric current for flowing through the second branch is 1.
10. circuit according to claim 8, which is characterized in that first pulse signal and second pulse signal
It is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464563.XA CN109152122A (en) | 2017-06-19 | 2017-06-19 | A kind of LED color temperature adjusting method and LED colour temperature adjusts circui |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710464563.XA CN109152122A (en) | 2017-06-19 | 2017-06-19 | A kind of LED color temperature adjusting method and LED colour temperature adjusts circui |
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| CN109152122A true CN109152122A (en) | 2019-01-04 |
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| CN201710464563.XA Pending CN109152122A (en) | 2017-06-19 | 2017-06-19 | A kind of LED color temperature adjusting method and LED colour temperature adjusts circui |
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| CN101222805A (en) * | 2007-12-20 | 2008-07-16 | 北京中星微电子有限公司 | Method for multi-string LED time-sharing regulation and driving mechanism using the same |
| CN204014221U (en) * | 2014-08-25 | 2014-12-10 | 北京澄通光电股份有限公司 | The single colour temperature regulating circuit that drives of two-way LED illumination |
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Application publication date: 20190104 |