CN105025635B - A kind of LED light modulations toning circuit temperature - Google Patents
A kind of LED light modulations toning circuit temperature Download PDFInfo
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- CN105025635B CN105025635B CN201510465773.1A CN201510465773A CN105025635B CN 105025635 B CN105025635 B CN 105025635B CN 201510465773 A CN201510465773 A CN 201510465773A CN 105025635 B CN105025635 B CN 105025635B
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Abstract
The invention discloses a kind of LED to dim toning circuit temperature, for carrying out light modulation color-temperature regulating to including at least LED string of a warm light lamp string and an at least cold light lamp string, LED light modulation toning circuit temperatures include being used to produce dimming pwm signal and all the way master controller of color-temperature regulating pwm signal, the PWM control units being connected with main controller and the color-temperature regulating unit being connected with main controller all the way, the input side of PWM control units is connected by a rectification filtering unit with AC input end, and outlet side is connect by a power control unit with LED series winding.Because master controller controls PWM control units and color-temperature regulating unit respectively, two paths of signals is separate, therefore the regulation of LED cross luma degree will not cause the change of its colour temperature, and similarly, the regulation of its colour temperature will not also cause the change of brightness.When master controller is N positions MCU, present invention light modulation color-temperature regulating grade can reach 2N×2N=22NLevel, it is capable of brightness and the colour temperature of accurate adjustment light source.
Description
Technical field
The present invention relates to lighting field, more particularly to a kind of LED light modulations toning circuit temperature.
Background technology
In field of LED illumination, light modulation color-temperature regulating is always focus of concern.So-called light modulation adjusts the bright of light source
Degree；So-called color-temperature regulating, generically it is considered to adjust the color of light source, colour temperature is color and the black matrix of source emissioning light in a certain temperature
The temperature of the lower radiant light form and aspect of degree while black matrix, in black body radiation, as temperature is different, the color of light is different.Colour temperature
Different from brightness often to give people under different impression, such as high color temperature light source irradiation, brightness is not high, has one kind to people
Sombre atmosphere；Under low color temperature light sources irradiation, brightness is too high a kind of sultry sensation to people.As can be seen here, accurate adjustment
The brightness of light source and colour temperature, be advantageous to improve the LED illumination competitiveness of product in market.
At present, for electric current (simulation light modulation) that in terms of LED light modulations, two kinds of main solutions are linear regulation LED
Or in high frequency, driving current is allowed from 0 to being toggled target current value (digital dimming).Utilize pulse width modulation
(PWM) come to set circulation and work period be the simplest method of realizing digital dimming.PWM light modulation principle be：External
The dutycycle that pwm signal changes constant-current source output adjusts the size of LED drive current virtual value, so as to realize light modulation.
Existing light modulation color-temperature regulating scheme：Driving power produces a constant-current source first, in light modulation color-temperature regulating circuit output end
The pwm signal of two-way independence is produced with a controller, wherein pwm signal controls warm light lamp string (warm light lamp string all the way all the way
3000k colour temperatures or so), another way pwm signal controls cold light lamp string (positive white light, 7000k colour temperatures or so) all the way, and adjustment is every respectively
Road PWM dutycycle to change the size of current effective value so as to change the brightness ratio of warm light lamp string and cold light lamp string, reflect by
This design, whole LED light modulation color-temperature regulating can be realized simultaneously.
The major defect of existing scheme is：Assuming that light modulation color-temperature regulating in two-way PWM, Ze Mei roads is produced using general N positions MUC
Combination up to 2NLevel, two-way combination of light sources get up up to 2N+2N=2N+1Level, combination regulation rank deficient are more.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of LED that can realize more grade light modulation toning temp effects
Light modulation toning circuit temperature.
In order to solve the above technical problems, the present invention adopts the following technical scheme that.
A kind of LED light modulations toning circuit temperature, for including an at least warm light lamp string and at least LED of a cold light lamp string
Lamp string carries out light modulation color-temperature regulating, and the LED light modulations toning circuit temperature includes one and dims pwm signal all the way for generation and adjust all the way
The master controller of colour temperature pwm signal, the PWM control units being connected with the main controller and a tune being connected with the main controller
Colour temperature unit, the input side of the PWM control units are connected by a rectification filtering unit with AC input end, and outlet side passes through
One power control unit and with LED series winding connect, wherein,
The PWM control units receive the light modulation pwm signal for coming from the master controller, and level conversion is carried out to it,
First pwm control signal for controlling the power control unit break-make is then exported, so as to adjust input to the electricity of LED string
Stream；
The color-temperature regulating unit includes that conduction level is opposite one to be accessed in the first switch circuit of warm light lamp string and one
The second switch circuit in cold light lamp string is accessed, the color-temperature regulating pwm signal for coming from the master controller exports to described respectively
First switch circuit and second switch circuit are to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize LED string
Colour temperature regulation.
Further, between master controller and the color-temperature regulating unit or between the master controller and PWM control units
Access has an isolated location.
Further, the isolating device of the isolated location is photoelectrical coupler or coupling transformer.
Further, the power control unit includes transformer and is connected to the power switch of the transformer primary
Pipe, the power switch pipe are connected with the master controller output end, and the transformer secondary passes through contacts with the LED
Connect, conducting, cut-off of the first pwm control signal that the master controller exports by adjusting power switch pipe are transformer coupled
Voltage to primary side is adjusted, so as to have adjusted input to the electric current of LED string.
Further, the first switch circuit includes first switch pipe, and the second switch circuit includes opening with first
Close the opposite second switch pipe of pipe conduction level.
Further, the first switch circuit includes first switch pipe, and the second switch circuit includes opening with first
Close pipe conduction level identical second switch pipe and be connected with the second switch pipe can be by second switch pipe phase of output signal
The 3rd anti-phase switching tube.
Further, the LED light modulations toning circuit temperature also includes a light modulation color-temperature regulating for being used to receive outside input
The receiving unit of desired signal, the master controller generate the light modulation PWM according to the light modulation color-temperature regulating desired signal received
Signal and color-temperature regulating pwm signal.
Further, the power control unit is provided with absorbing circuit, for absorbing the leakage field of transformer, reduces power and opens
The stress of pipe is closed, to protect power switch pipe.
Further, the first switch circuit includes a N-type metal-oxide-semiconductor, and the grid of the N-type metal-oxide-semiconductor passes through one first electricity
Resistance is connected with the color-temperature regulating pwm signal end, and the drain electrode of the N-type metal-oxide-semiconductor is connected with warm light lamp string, and its source electrode is connected to ground；Institute
Stating second switch circuit includes a p-type metal-oxide-semiconductor, and the grid of the p-type metal-oxide-semiconductor is believed by a second resistance and the color-temperature regulating PWM
Number end connection, the drain electrode of the p-type metal-oxide-semiconductor are contacted with cold light lamp and connect, and its source electrode is connected to ground.
Further, the first switch circuit includes the first N-type metal-oxide-semiconductor, and the grid of the first N-type metal-oxide-semiconductor passes through one
First resistor is connected with the color-temperature regulating pwm signal end, and the drain electrode of the first N-type metal-oxide-semiconductor is connected with warm light lamp string, its source electrode with
Ground connects；The second switch circuit includes the second N-type metal-oxide-semiconductor, the 3rd N-type metal-oxide-semiconductor, the grid of the second N-type metal-oxide-semiconductor
It is connected by a second resistance with the color-temperature regulating pwm signal end, the source electrode of the second N-type metal-oxide-semiconductor is connected to ground, and it, which drains, divides
It is not connected, is connected by one the 4th resistance with the grid of the 3rd N-type metal-oxide-semiconductor, the 3rd N-type with power supply by a 3rd resistor
The drain electrode of metal-oxide-semiconductor is connect with cold light lamp series winding, and its source electrode is connected to ground.
Further, the first switch circuit includes a NPN type triode, and the base stage of the NPN type triode passes through one
First resistor and be connected to color-temperature regulating pwm signal end, the colelctor electrode of the NPN type triode is connected with warm light lamp string, its emitter stage
Ground connection；The second switch circuit includes a PNP type triode, and the base stage of the PNP type triode passes through a second resistance and tune
Colour temperature pwm signal end connects, and emitter stage and the cold light lamp series winding of the PNP type triode connect, its grounded collector.
Further, the first switch circuit includes the first NPN type triode, the base stage of first NPN type triode
It is connected by a first resistor with color-temperature regulating pwm signal end, the colelctor electrode of first NPN type triode is connected with warm light lamp string,
Its grounded emitter；The second switch circuit includes the second NPN type triode, the 3rd NPN type triode, second NPN type
The base stage of triode is connected by a second resistance with color-temperature regulating pwm signal end, emitter stage and the ground of second NPN type triode
Connection, its colelctor electrode are connected by a 3rd resistor with power supply, by one the 4th resistance and the 3rd NPN type triode respectively
Base stage connects, and colelctor electrode and the cold light lamp series winding of the 3rd NPN type triode connect, its grounded emitter.
Compared with the prior art, the invention has the advantages that：The master controller produces dims pwm signal and all the way all the way
Color-temperature regulating pwm signal, two paths of signals control the PWM control units and color-temperature regulating unit respectively, because two paths of signals is mutually only
It is vertical, therefore the regulation of LED cross luma degree will not cause the change of its colour temperature, similarly, the regulation of its colour temperature will not also cause brightness
Change.When the master controller is N positions MCU, present invention light modulation color-temperature regulating grade can reach 2N×2N=22NLevel, can
The brightness of accurate adjustment light source and colour temperature.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the present invention.
Fig. 2 is the circuit connecting relation schematic diagram of power control unit.
Fig. 3 is the circuit block diagram of the present invention in certain embodiments.
Fig. 4 is circuit connecting relation schematic diagram corresponding to Fig. 3 partial circuit block diagram.
Fig. 5 is circuit connecting relation schematic diagram corresponding to Fig. 3 partial circuit block diagram.
Fig. 6 is circuit connecting relation schematic diagram corresponding to Fig. 3 partial circuit block diagram.
Fig. 7 is circuit connecting relation schematic diagram corresponding to Fig. 3 partial circuit block diagram.
Fig. 8 is the circuit block diagram of the present invention in further embodiments.
Fig. 9 is circuit connecting relation schematic diagram corresponding to Fig. 8 partial circuit block diagram.
Figure 10 is circuit connecting relation schematic diagram corresponding to Fig. 8 partial circuit block diagram.
Figure 11 is circuit connecting relation schematic diagram corresponding to Fig. 8 partial circuit block diagram.
Figure 12 is circuit connecting relation schematic diagram corresponding to Fig. 8 partial circuit block diagram
Embodiment
In order to more fully understand the technology contents of the present invention, technical scheme is made with reference to specific embodiment
It is further described and illustrates.
As shown in fig.1, in some embodiments of the invention, LED light modulation toning circuit temperatures include a main control
Device 10, a PWM control units 20 and a color-temperature regulating unit 30, wherein, the master controller 10 is used to produce dims pwm signal all the way
PWM1 and all the way color-temperature regulating pwm signal PMW2, the input sides of the PWM control units 20 by a rectification filtering unit 50 and with AC
Input is connected, and outlet side is then connected by a power control unit 60 with LED string 40, and the PWM control units 20 connect
Receive the light modulation pwm signal for coming from the master controller 10 and complete level conversion, then exporting one controls the Power Control list
First pwm control signal of first 60 break-makes, so as to adjust output to the size of current of LED string 40, to realize LED light modulation.
The color-temperature regulating unit 30 is connected with the master controller 10, includes that conduction level is opposite one to be accessed and opened in the first of warm light lamp string
Second switch circuit in cold light lamp string is accessed on powered-down road and one, comes from PMW2 points of the color-temperature regulating pwm signal of master controller 10
Do not export to first switch circuit and second switch circuit to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize
The colour temperature regulation of LED string 40.
Wherein, master controller 10 is N positions MCU, can be the MCU of 1,4,8,16,32,64.In the specification of this patent
In illustrated by taking 8 MCU as an example.The duty of the dutycycle of first pwm control signal and the input signal of PWM control units 20
Than can be the proportional relation followed, or the inverse relation followed.For example, when light modulation pwm signal PMW1 dutycycles are 40%
When, the dutycycle of the first pwm control signal is also 40%；Or when it is 40% to dim pwm signal PMW1 dutycycles, first
The dutycycle of pwm control signal is 60%.
The master controller 10 produces light modulation pwm signal all the way and color-temperature regulating pwm signal, two paths of signals control institute respectively all the way
PWM control units 20 and color-temperature regulating unit 30 are stated, because two paths of signals is separate, therefore the regulation of the brightness of LED string 40 is not
The change of its colour temperature can be caused, similarly, the regulation of its colour temperature will not also cause the change of brightness.When the master controller 10 is 8
During the MCU of position, present invention light modulation color-temperature regulating grade can reach 28×28=65536 grades, it is capable of brightness and the color of accurate adjustment light source
Temperature.
In certain embodiments, as shown in figure 3, being accessed between master controller 10 and color-temperature regulating unit 30 has an isolated location
70, the color-temperature regulating pwm signal PWM2 that master controller 10 exports is coupled to the color-temperature regulating unit 30, master control through the isolated location 70
The light modulation pwm signal PWM1 of device 10 processed is directly inputted to the PWM control units 20.The main device of isolated location 70 is photoelectricity coupling
Clutch or coupling transformer, during signal one-way transmission, realize light modulation, the two-part electrical isolation of color-temperature regulating, anti-interference energy
Power is strong.
With reference to Fig. 4, in the embodiment shown in fig. 4, the isolating device of the isolated location 70 is photoelectrical coupler IC2, light
Electric coupler IC2 1 pin is connected by resistance R2 and the color-temperature regulating pwm signal end exported with master controller 10, and 2 pin connect signal
Ground, with connecing power supply, on the one hand 4 pin are connected 3 pin by resistance R3 with power supply, are on the one hand directly connected with color-temperature regulating unit 30.It is main
The color-temperature regulating pwm signal PWM2 that controller 10 exports is input to photoelectrical coupler IC2 through resistance R2, becomes through opto-electronic conversion and adjusts
The PWM2A signals of colour temperature pwm signal PWM2 opposite in phase, and PWM2A signals are input to color-temperature regulating unit 30.
Fig. 2 shows a kind of embodiment of power control unit, and in this embodiment, the power control unit 60 includes becoming
The depressor T1 and power MOS pipe Q3 positioned at transformer T1 primary sides, power MOS pipe Q3 grid and the GD pin phases of master controller 10
Even, the rectified filter circuit of transformer T1 primary sides and be connected with LED string 40, the master controller 10 output the first PWM control
Signal processed is by adjusting power MOS pipe Q3 conducting, cut-off transformer T1 is coupled to the voltage of primary side and is changed, from
And input is have adjusted to the size of current of LED string 40.Resistance R6, electric capacity C1, diode D1 composition absorbing circuits, are used in figure
Transformer T1 leakage field is absorbed, power MOS pipe Q3 stress is reduced, to protect power MOS pipe Q3.Diode D2, electric capacity C2 are used
In realizing rectifying and wave-filtering.It will be appreciated by those skilled in the art that ground, the power control unit can also be other conventional circuits
Structure.
Fig. 4 also show a kind of structure of color-temperature regulating unit 30, and it includes first switch circuit and second switch circuit, and this
One on-off circuit includes a N-type metal-oxide-semiconductor Q1, and N-type metal-oxide-semiconductor Q1 grid is connected to color-temperature regulating by first resistor R4
Pwm signal end, N-type metal-oxide-semiconductor Q1 drain electrode are connected with warm light lamp string LED1, its source ground；Second switch circuit includes a P
Type metal-oxide-semiconductor Q2, the p-type metal-oxide-semiconductor Q2 grid are connected by second resistance R5 with color-temperature regulating pwm signal end, p-type metal-oxide-semiconductor Q2's
Drain electrode is connected with cold light lamp string LED2, its source ground.
Fig. 5 also show another structure of color-temperature regulating unit 30, and it includes first switch circuit and second switch circuit, should
First switch circuit includes the first N-type metal-oxide-semiconductor Q1, and N-type metal-oxide-semiconductor Q1 grid is connected to color-temperature regulating by first resistor R4
Pwm signal end, the first N-type metal-oxide-semiconductor Q1 drain electrode are connected with warm light lamp string LED1, and its source electrode is connected to ground；Second switch electricity
Road includes the second N-type metal-oxide-semiconductor Q2,3rd resistor R6, the 3rd N-type metal-oxide-semiconductor Q4, and the second N-type metal-oxide-semiconductor Q2 grid passes through second
Resistance R5 is connected with color-temperature regulating pwm signal end, and the second N-type metal-oxide-semiconductor Q2 source electrode is connected to ground, and its drain electrode passes through the 3rd respectively
Resistance R6 is connected with power supply, is connected by the 4th resistance R7 with the 3rd N-type metal-oxide-semiconductor Q4 grid, the 3rd N-type metal-oxide-semiconductor Q4
Drain electrode be connected with cold light lamp string LED2, its source electrode is connected to ground.
It will be appreciated by those skilled in the art that ground, can also will play on-off action in first switch circuit and second switch circuit
Metal-oxide-semiconductor change switch triode into realize colour temperature adjust.
As Fig. 6 shows a kind of structure of color-temperature regulating unit 30, it includes first switch circuit and second switch circuit, and this
One on-off circuit includes a NPN type triode Q1, and NPN type triode Q1 base stage is connected to toning by first resistor R4
Warm pwm signal end, NPN type triode Q1 colelctor electrode are connected with warm light lamp string LED1, its grounded emitter；Second switch electricity
Road includes a PNP type triode Q2, and PNP type triode Q2 base stage is connected by second resistance R5 and color-temperature regulating pwm signal end
Connect, PNP type triode Q2 emitter stage is connected with cold light lamp string LED2, its grounded collector.
Fig. 7 also show another structure of color-temperature regulating unit 30, and it includes first switch circuit and second switch circuit, should
First switch circuit includes the first NPN type triode Q1, and NPN type triode Q1 base stage is connected to by first resistor R4
Color-temperature regulating pwm signal end, NPN type triode Q1 colelctor electrode are connected with warm light lamp string LED1, its grounded emitter；Second opens
Powered-down road includes the second NPN type triode Q2, the 3rd NPN type triode Q4, and second NPN type triode Q2 base stage passes through
Two resistance R5 are connected with color-temperature regulating pwm signal end, and second NPN type triode Q2 emitter stage is connected to ground, its colelctor electrode point
It is not connected with power supply by 3rd resistor R6, is connected by the 4th resistance R7 with the 3rd NPN type triode Q4 base stage, this
Three NPN type triode Q4 colelctor electrode connects with cold light lamp series winding, its grounded emitter.
It will be appreciated by those skilled in the art that ground, the structure of color-temperature regulating unit 30 can also use remaining circuit, as long as can be full
Sufficient first switch circuit and second switch circuit turn-on situation is anti-phase, just can realize the regulation of colour temperature.
With the operation principle of the explanation present invention with reference to shown in Fig. 4.When MCU works, dim signal PWM1 adds through resistance R1
To the master chip IC1 of PWM control units 20 DIM pin, DIM pin are sent to completion level inside master chip IC1 after being connected to PWM1 signals
Conversion, conducting, the cut-off of power switch pipe Q3 in the first pwm control signal control power control unit 60 are then exported by GD pin
So as to adjust output to the size of current of LED string 40, to realize LED light modulation.For example, when PWM1 duty cycle square wave slowly
Become big and be input to master chip IC1 DIM pin, master chip IC1 exports one and follows being tuned up for PWM1 dutycycles direct ratio change
The first pwm control signal, first pwm control signal adjustment power control unit 60 in power switch pipe conducting, make defeated
Go out electric current and become big, the brightness of LED string 40 increase, vice versa.During due to regulation brightness, PWM2 does not change, so colour temperature can be with
Holding does not change.
PWM2 caused by MCU is added to photoelectrical coupler IC2 input after resistance R2, through opto-electronic conversion, is exporting
PWM2A signals caused by end and PWM2 signal inversions.PWM2A controls N-type metal-oxide-semiconductor Q1 dutycycle after R4, warm to adjust
Light lamp string LED1, PWM2A control p-type metal-oxide-semiconductor Q2 dutycycle after R5, to adjust cold light lamp string LED2.Because Q1 is N-type
Metal-oxide-semiconductor, Q2 are p-type metal-oxide-semiconductors, and Q1 is turned on when PWM2A is high level, and Q2 is turned on when PWM2A is low level, Q1 and Q2 conduction levels
It is opposite, that is, when PWM2 dutycycles reduce, PWM2A dutycycles increase, warm light lamp string LED1 is bright to cold light lamp string LED2
The increase of degree ratio；PWM2 dutycycles increase, and PWM2A dutycycles reduce, and warm light lamp string LED1 is to cold light lamp string LED2 brightness ratios
Reduce, therefore easily reach the purpose of regulation colour temperature.
Circuit shown in Fig. 5 is essentially identical with circuit operation principle shown in Fig. 4, and difference is color-temperature regulating unit 30, existing
Only illustrate this part operation principle.PWM2 caused by MCU is added to photoelectrical coupler IC2 input after resistance R2, through light
Electricity conversion, in PWM2A signals caused by output end and PWM2 signal inversions.PWM2A controls the first N-type metal-oxide-semiconductor Q1 after R4
Dutycycle, control the second N-type metal-oxide-semiconductor Q2 after R5 to adjust warm light lamp string LED1, PWM2A, and after controlled through resistance R7
3rd N-type metal-oxide-semiconductor Q4 dutycycle.When PWM2A is high level, the first N-type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2 conducting, this
When the second N-type metal-oxide-semiconductor Q2 outputs signal and PWM2A it is anti-phase, therefore the 3rd N-type metal-oxide-semiconductor Q4 grid meets low level, the 3rd N
Type metal-oxide-semiconductor Q4 is not turned on.It follows that when PWM2 dutycycles reduce, the increase of PWM2A dutycycles, LED1 is to cold light for warm light lamp string
The increase of lamp string LED2 brightness ratios；PWM2 dutycycles increase, and PWM2A dutycycles reduce, and warm light lamp string LED1 is to cold light lamp string
LED2 brightness ratios are reduced, therefore easily reach the purpose of regulation colour temperature.
It will be appreciated by those skilled in the art that ground, operation principle of the invention shown in Fig. 6, Fig. 7 respectively with Fig. 4, Fig. 5
It is similar, repeat no more.
In further embodiments, isolate as shown in figure 8, accessing to have between master controller 10 and PWM control units 20
Unit 70, light modulation pwm signal PWM1 is coupled to PWM control units 20 through isolated location 70 caused by master controller 10, master control
The color-temperature regulating pwm signal PWM2 of device 10 processed is directly inputted to color-temperature regulating unit 30.The main device of isolated location 70 is photoelectric coupling
Device or coupling transformer, during signal one-way transmission, realize light modulation, the two-part electrical isolation of color-temperature regulating, antijamming capability
By force.
With reference to Fig. 9, in the embodiment shown in fig. 9, the isolating device of the isolated location 70 is photoelectrical coupler IC2, light
Electric coupler IC2 1 pin is connected by resistance R2 and the light modulation pwm signal PWM1 ends exported with master controller 10, and 2 pin connect power supply
Ground, 3 pin connect signal ground, and on the one hand 4 pin are connected by resistance R1 with power supply, be on the one hand directly connected with PWM control units 20.It is main
The light modulation pwm signal PWM1 that controller 10 exports is input to photoelectrical coupler IC2 through resistance R2, becomes through opto-electronic conversion and dims
The PWM1A signals of pwm signal PWM1 opposite in phase, to adjust PWM control units 20.
Fig. 2 shows a kind of embodiment of power control unit, and in this embodiment, the power control unit 60 includes becoming
The depressor T1 and power MOS pipe Q3 positioned at transformer T1 primary sides, power MOS pipe Q3 grid and the GD pin phases of master controller 10
Even, the rectified filter circuit of transformer T1 primary sides and be connected with LED string 40, the master controller 10 output the first PWM control
Signal processed is by adjusting power MOS pipe Q3 conducting, cut-off transformer T1 is coupled to the voltage of primary side and is changed, from
And input is have adjusted to the size of current of LED string 40.Resistance R6, electric capacity C1, diode D1 composition absorbing circuits, are used in figure
Transformer T1 leakage field is absorbed, power MOS pipe Q3 stress is reduced, to protect power MOS pipe Q3.Diode D2, electric capacity C2 are used
In realizing rectifying and wave-filtering.It will be appreciated by those skilled in the art that ground, the power control unit can also be other conventional circuits
Structure.
Fig. 9 shows a kind of structure of color-temperature regulating unit 30, and it includes first switch circuit and second switch circuit, and this first
On-off circuit includes a N-type metal-oxide-semiconductor Q1, and N-type metal-oxide-semiconductor Q1 grid is connected to color-temperature regulating PWM by first resistor R4
Signal end, N-type metal-oxide-semiconductor Q1 drain electrode are connected with warm light lamp string LED1, its source ground；Second switch circuit includes a p-type
Metal-oxide-semiconductor Q2, the p-type metal-oxide-semiconductor Q2 grid are connected by second resistance R5 with color-temperature regulating pwm signal end, p-type metal-oxide-semiconductor Q2 leakage
Pole is connected with cold light lamp string LED2, its source ground.
Figure 10 also show another structure of color-temperature regulating unit 30, and the first switch circuit includes the first N-type metal-oxide-semiconductor Q1,
N-type metal-oxide-semiconductor Q1 grid is connected to color-temperature regulating pwm signal end by first resistor R4, the first N-type metal-oxide-semiconductor Q1 leakage
Pole is connected with warm light lamp string LED1, and its source electrode is connected to ground；Second switch circuit includes the second N-type metal-oxide-semiconductor Q2,3rd resistor
R6, the 3rd N-type metal-oxide-semiconductor Q4, the second N-type metal-oxide-semiconductor Q2 grid are connected by second resistance R5 with color-temperature regulating pwm signal end,
Second N-type metal-oxide-semiconductor Q2 source electrode is connected to ground, and its drain electrode is connected by 3rd resistor R6 with power supply, by the 4th electricity respectively
Resistance R7 is connected with the 3rd N-type metal-oxide-semiconductor Q4 grid, and the 3rd N-type metal-oxide-semiconductor Q4 drain electrode is connected with cold light lamp string LED2, its
Source electrode is connected to ground.It will be appreciated by those skilled in the art that ground, will can also rise open in first switch circuit and second switch circuit
The metal-oxide-semiconductor of pass effect changes switch triode into realize that colour temperature is adjusted.
As Figure 11 shows a kind of structure of color-temperature regulating unit 30, it includes first switch circuit and second switch circuit, should
First switch circuit includes a NPN type triode Q1, and NPN type triode Q1 base stage is adjusted by first resistor R4 to be connected to
Colour temperature pwm signal end, NPN type triode Q1 colelctor electrode are connected with warm light lamp string LED1, its grounded emitter；Second switch
Circuit includes a PNP type triode Q2, and PNP type triode Q2 base stage passes through second resistance R5 and color-temperature regulating pwm signal end
Connection, PNP type triode Q2 emitter stage are connected with cold light lamp string LED2, its grounded collector.
Figure 12 also show another structure of color-temperature regulating unit 30, and it includes first switch circuit and second switch circuit,
The first switch circuit includes the first NPN type triode Q1, and NPN type triode Q1 base stage is connected by first resistor R4
In color-temperature regulating pwm signal end, NPN type triode Q1 colelctor electrode is connected with warm light lamp string LED1, its grounded emitter；Second
On-off circuit includes the second NPN type triode Q2, the 3rd NPN type triode Q4, and second NPN type triode Q2 base stage passes through
Second resistance R5 is connected with color-temperature regulating pwm signal end, and second NPN type triode Q2 emitter stage is connected to ground, its colelctor electrode
It is connected with power supply by 3rd resistor R6, is connected by the 4th resistance R7 with the 3rd NPN type triode Q4 base stage respectively, should
3rd NPN type triode Q4 colelctor electrode connects with cold light lamp series winding, its grounded emitter.
It will be appreciated by those skilled in the art that ground, the structure of color-temperature regulating unit 30 can also use remaining circuit, as long as can be full
Sufficient first switch circuit and second switch circuit turn-on situation is anti-phase, just can realize the regulation of colour temperature.
With the operation principle of the explanation present invention with reference to shown in Fig. 9.When MCU works, dim signal PWM1 is sent through resistance R2
To photoelectrical coupler IC2 input, the output end in photoelectrical coupler IC2 after opto-electronic conversion produces and PWM1 signal phases
Opposite PWM1A signals, the PWM1A signals are added to the master chip IC1 of PWM control units 20 DIM pin through resistance R1, are sent to main core
Level conversion is completed inside piece IC1, then exporting power in the first pwm control signal control power control unit 60 by GD pin opens
Close pipe Q3 conducting, cut-off is exported to the size of current of LED string 40, to realize LED light modulation so as to adjust.For example, work as
PWM1 duty cycle square wave slowly diminishes, and PWM1A dutycycle slowly becomes big, and is input to master chip IC1 DIM pin, main core
Piece IC1 DG pin export first pwm control signal tuned up for following PWM1A dutycycles direct ratio to change, the first PWM
Power switch pipe Q3 conducting, makes output current become big, the brightness of LED string 40 increases in control signal adjustment power control unit 60
Add, vice versa.During due to regulation brightness, PWM2 does not change, so colour temperature can keep not changing.
PWM2 caused by MCU is directly connected to color-temperature regulating unit 30.PWM2 controls N-type metal-oxide-semiconductor Q1 dutycycle after R4,
To adjust the dutycycle that warm light lamp string LED1, PWM2 control p-type metal-oxide-semiconductor Q2 after R5, to adjust cold light lamp string LED2.Due to
Q1 is that N-type metal-oxide-semiconductor, Q2 are p-type metal-oxide-semiconductors, and Q1 is turned on when PWM2 is high level, and Q2 is turned on when PWM2 is low level, and Q1 and Q2 are led
It is anti-to be powered flat, that is, when PWM2 dutycycles increase warm light lamp string LED1 to the increase of cold light lamp string LED2 brightness ratios；
PWM2 dutycycles reduce, and warm light lamp string LED1 is reduced to cold light lamp string LED2 brightness ratios, therefore easily reaches regulation colour temperature
Purpose.
Circuit shown in Figure 10 is essentially identical with circuit operation principle shown in Fig. 4, and difference is color-temperature regulating unit 30, existing
Only illustrate this part operation principle.PWM2 caused by MCU is added to photoelectrical coupler IC2 input after resistance R2, through light
Electricity conversion, in PWM2A signals caused by output end and PWM2 signal inversions.PWM2A controls the first N-type metal-oxide-semiconductor Q1 after R4
Dutycycle, control the second N-type metal-oxide-semiconductor Q2 after R5 to adjust warm light lamp string LED1, PWM2A, and after controlled through resistance R7
3rd N-type metal-oxide-semiconductor Q4 dutycycle.When PWM2A is high level, the first N-type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2 conducting, this
When the second N-type metal-oxide-semiconductor Q2 outputs signal and PWM2A it is anti-phase, therefore the 3rd N-type metal-oxide-semiconductor Q4 grid meets low level, the 3rd N
Type metal-oxide-semiconductor Q4 is not turned on.It follows that when PWM2 dutycycles reduce, the increase of PWM2A dutycycles, LED1 is to cold light for warm light lamp string
The increase of lamp string LED2 brightness ratios；PWM2 dutycycles increase, and PWM2A dutycycles reduce, and warm light lamp string LED1 is to cold light lamp string
LED2 brightness ratios are reduced, therefore easily reach the purpose of regulation colour temperature.
It will be appreciated by those skilled in the art that ground, operation principle of the invention shown in Figure 11, Figure 12 respectively with Fig. 9, figure
10 it is similar, repeat no more.
In certain embodiments, the light modulation color-temperature regulating that LED light modulations toning circuit temperature is additionally provided with for receiving outside input needs
The receiving unit of signal is sought, master controller is according to the light modulation color-temperature regulating desired signal generation light modulation pwm signal received and toning
Warm pwm signal.The receiving unit can be connected with external smart terminal (mobile phone, IPAD etc.), and the light modulation from communication network is adjusted
Colour temperature desired signal is supplied to master controller.The receiving unit can use any receiving module with communication function, such as
WIFI module, bluetooth module, 4G communication modules, 3G communication modules, 2G communication modules etc..User only need to be in outside intelligent terminal
Operated just not limited by region, space and control LED light modulation toning circuit temperatures, the use of significant increase user is just
Victory.
The technology contents set forth above that the present invention is only further illustrated with embodiment, in order to which reader is easier to understand,
But embodiments of the present invention are not represented and are only limitted to this, any technology done according to the present invention extends or recreation, is sent out by this
Bright protection.
Claims (8)
- A kind of 1. LED light modulations toning circuit temperature, for including an at least warm light lamp string and at least LED of a cold light lamp string String carries out light modulation color-temperature regulating, it is characterised in that：The LED light modulations toning circuit temperature includes one and dims PWM letters all the way for producing Number and the master controller of color-temperature regulating pwm signal, the PWM control units being connected with the main controller and one and the master control all the way The color-temperature regulating unit of device connection, the input side of the PWM control units are connected by a rectification filtering unit with AC input end, Outlet side is connect by a power control unit with LED series winding, wherein,The PWM control units receive the light modulation pwm signal for coming from the master controller, carry out level conversion to it, then First pwm control signal for controlling the power control unit break-make is exported, so as to adjust input to the electric current of LED string；The color-temperature regulating unit includes that conduction level is opposite one to be accessed and accessed in the first switch circuit of warm light lamp string and one In the second switch circuit of cold light lamp string, the color-temperature regulating pwm signal for coming from the master controller exports to described first respectively On-off circuit and second switch circuit are to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize the color of LED string Temperature regulation；Between the master controller and color-temperature regulating unit or access to have between the master controller and PWM control units and isolate list Member；The first switch circuit includes a N-type metal-oxide-semiconductor, and the grid of the N-type metal-oxide-semiconductor passes through a first resistor and the color-temperature regulating Pwm signal end is connected, and the drain electrode of the N-type metal-oxide-semiconductor is connected with warm light lamp string, and its source electrode is connected to ground；The second switch circuit Including a p-type metal-oxide-semiconductor, the grid of the p-type metal-oxide-semiconductor is connected by a second resistance with the color-temperature regulating pwm signal end, the p-type The drain electrode of metal-oxide-semiconductor is connect with cold light lamp series winding, and its source electrode is connected to ground.
- A kind of 2. LED light modulations toning circuit temperature, for including an at least warm light lamp string and at least LED of a cold light lamp string String carries out light modulation color-temperature regulating, it is characterised in that：The LED light modulations toning circuit temperature includes one and dims PWM letters all the way for producing Number and the master controller of color-temperature regulating pwm signal, the PWM control units being connected with the main controller and one and the master control all the way The color-temperature regulating unit of device connection, the input side of the PWM control units are connected by a rectification filtering unit with AC input end, Outlet side is connect by a power control unit with LED series winding, wherein,The PWM control units receive the light modulation pwm signal for coming from the master controller, carry out level conversion to it, then First pwm control signal for controlling the power control unit break-make is exported, so as to adjust input to the electric current of LED string；The color-temperature regulating unit includes that conduction level is opposite one to be accessed and accessed in the first switch circuit of warm light lamp string and one In the second switch circuit of cold light lamp string, the color-temperature regulating pwm signal for coming from the master controller exports to described first respectively On-off circuit and second switch circuit are to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize the color of LED string Temperature regulation；Between the master controller and color-temperature regulating unit or access to have between the master controller and PWM control units and isolate list Member；The first switch circuit includes the first N-type metal-oxide-semiconductor, the grid of the first N-type metal-oxide-semiconductor by a first resistor with it is described Color-temperature regulating pwm signal end is connected, and the drain electrode of the first N-type metal-oxide-semiconductor is connected with warm light lamp string, and its source electrode is connected to ground；Described Two on-off circuits include the second N-type metal-oxide-semiconductor, the 3rd N-type metal-oxide-semiconductor, and the grid of the second N-type metal-oxide-semiconductor passes through one second electricity Resistance is connected with the color-temperature regulating pwm signal end, and the source electrode of the second N-type metal-oxide-semiconductor is connected to ground, and its drain electrode passes through one the 3rd respectively Resistance is connected with power supply, is connected by one the 4th resistance with the grid of the 3rd N-type metal-oxide-semiconductor, the drain electrode of the 3rd N-type metal-oxide-semiconductor Connect with cold light lamp series winding, its source electrode is connected to ground.
- A kind of 3. LED light modulations toning circuit temperature, for including an at least warm light lamp string and at least LED of a cold light lamp string String carries out light modulation color-temperature regulating, it is characterised in that：The LED light modulations toning circuit temperature includes one and dims PWM letters all the way for producing Number and the master controller of color-temperature regulating pwm signal, the PWM control units being connected with the main controller and one and the master control all the way The color-temperature regulating unit of device connection, the input side of the PWM control units are connected by a rectification filtering unit with AC input end, Outlet side is connect by a power control unit with LED series winding, wherein,The PWM control units receive the light modulation pwm signal for coming from the master controller, carry out level conversion to it, then First pwm control signal for controlling the power control unit break-make is exported, so as to adjust input to the electric current of LED string；The color-temperature regulating unit includes that conduction level is opposite one to be accessed and accessed in the first switch circuit of warm light lamp string and one In the second switch circuit of cold light lamp string, the color-temperature regulating pwm signal for coming from the master controller exports to described first respectively On-off circuit and second switch circuit are to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize the color of LED string Temperature regulation；Between the master controller and color-temperature regulating unit or access to have between the master controller and PWM control units and isolate list Member；The first switch circuit includes a NPN type triode, and the base stage of the NPN type triode is by a first resistor and company Color-temperature regulating pwm signal end is connected to, the colelctor electrode of the NPN type triode is connected with warm light lamp string, its grounded emitter；Described second On-off circuit includes a PNP type triode, and the base stage of the PNP type triode passes through a second resistance and color-temperature regulating pwm signal end Connection, emitter stage and the cold light lamp series winding of the PNP type triode connect, its grounded collector.
- A kind of 4. LED light modulations toning circuit temperature, for including an at least warm light lamp string and at least LED of a cold light lamp string String carries out light modulation color-temperature regulating, it is characterised in that：The LED light modulations toning circuit temperature includes one and dims PWM letters all the way for producing Number and the master controller of color-temperature regulating pwm signal, the PWM control units being connected with the main controller and one and the master control all the way The color-temperature regulating unit of device connection, the input side of the PWM control units are connected by a rectification filtering unit with AC input end, Outlet side is connect by a power control unit with LED series winding, wherein,The PWM control units receive the light modulation pwm signal for coming from the master controller, carry out level conversion to it, then First pwm control signal for controlling the power control unit break-make is exported, so as to adjust input to the electric current of LED string；The color-temperature regulating unit includes that conduction level is opposite one to be accessed and accessed in the first switch circuit of warm light lamp string and one In the second switch circuit of cold light lamp string, the color-temperature regulating pwm signal for coming from the master controller exports to described first respectively On-off circuit and second switch circuit are to adjust the brightness ratio of warm light lamp string and cold light lamp string, so as to realize the color of LED string Temperature regulation；Between the master controller and color-temperature regulating unit or access to have between the master controller and PWM control units and isolate list Member；The first switch circuit includes the first NPN type triode, and the base stage of first NPN type triode passes through a first resistor It is connected with color-temperature regulating pwm signal end, the colelctor electrode of first NPN type triode is connected with warm light lamp string, its grounded emitter；Institute Stating second switch circuit includes the second NPN type triode, the 3rd NPN type triode, and the base stage of second NPN type triode passes through One second resistance is connected with color-temperature regulating pwm signal end, and the emitter stage of second NPN type triode is connected to ground, its colelctor electrode point It is not connected, is connected by one the 4th resistance with the base stage of the 3rd NPN type triode, the 3rd with power supply by a 3rd resistor The colelctor electrode of NPN type triode connects with cold light lamp series winding, its grounded emitter.
- 5. the LED light modulation toning circuit temperatures as described in any one of Claims 1 to 4, it is characterised in that：The power control unit Including transformer and the power switch pipe of the transformer primary is connected to, the power switch pipe and the master controller are defeated Go out end to be connected, the transformer secondary connects with LED series winding, and the first pwm control signal of master controller output leads to The conducting of adjustment power switch pipe, cut-off are crossed so that the transformer coupled voltage to primary side is changed, it is defeated so as to have adjusted Enter to the electric current of LED string.
- 6. the LED light modulation toning circuit temperatures as described in any one of Claims 1 to 4, it is characterised in that：The first switch circuit Including first switch pipe, the second switch circuit includes the second switch pipe opposite with first switch pipe conduction level.
- 7. the LED light modulation toning circuit temperatures as described in any one of Claims 1 to 4, it is characterised in that：The first switch circuit Including first switch pipe, the second switch circuit include with first switch pipe conduction level identical second switch pipe and with Second switch pipe connection can be by the 3rd anti-phase switching tube of second switch pipe phase of output signal.
- 8. the LED light modulation toning circuit temperatures as described in any one of Claims 1 to 4, it is characterised in that：The LED light modulations toning Circuit temperature also includes a receiving unit for dimming color-temperature regulating desired signal for being used to receive outside input, the master controller root According to the light modulation color-temperature regulating desired signal generation light modulation pwm signal and color-temperature regulating pwm signal received.
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| USD1011573S1 (en) | 2021-03-18 | 2024-01-16 | Milwaukee Electric Tool Corporation | Lighting apparatus |
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