CN106304509A - Illuminating circuit and the controller of application thereof and control method - Google Patents
Illuminating circuit and the controller of application thereof and control method Download PDFInfo
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- CN106304509A CN106304509A CN201610898606.0A CN201610898606A CN106304509A CN 106304509 A CN106304509 A CN 106304509A CN 201610898606 A CN201610898606 A CN 201610898606A CN 106304509 A CN106304509 A CN 106304509A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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Abstract
The present invention provides a kind of illuminating circuit and the controller of application thereof and control method, wherein, controller is for dimming light emitting module, described light emitting module includes at least one luminescence unit, described controller includes reference voltage adjustment module, and the external reference voltage of reference voltage adjustment module and switching signal, in order to according to described switching signal, described reference voltage is regulated accordingly, and generates regulation reference voltage with output.Reference voltage can be adjusted by the i.e. present invention according to different switching signals, and then the luminous situation of regulation luminescence unit, and improving product intelligent also improves Consumer's Experience.
Description
Technical field
The present invention relates to light modulation field, particularly relate to a kind of illuminating circuit and the controller of application thereof and control method.
Background technology
The typical case of existing switch toning quotes the switch being to export and control 2 paths of LEDs, and electric current is constant, generally comprises three
Plant illuminating state: for the first time by when compressing switch, opening first via white light, second time, by when compressing switch, opens the second tunnel yellow
Light, third time is by when compressing switch, and two paths of LED is opened simultaneously, colour mixture white light, gold-tinted.Under same current status, gold-tinted can compare white light
Slightly dark, during so two paths of LED is opened simultaneously, if simply simply opening two paths of LED, human eye compares white light when can substantially realize colour mixture
Or gold-tinted is bright a lot, if client just hopes simple exchange, lower colour temperature will be far from suitable.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of illuminating circuit and application thereof
Controller and control method, being used for solving can not be when multichannel luminescence unit be opened simultaneously in prior art, to luminescence unit
The problem that luminosity carries out adapt.
For achieving the above object and other relevant purposes, the present invention provides a kind of controller being applicable to LED drive power,
For dimming light emitting module, described light emitting module includes that at least one luminescence unit, described controller include: with reference to electricity
Pressure adjustment module, an external reference voltage and switching signal, in order to according to described switching signal, to carry out phase to described reference voltage
The regulation answered, and generate regulation reference voltage with output.
In the present invention one specific embodiment, described controller may further include: reference voltage generation module, in order to
Generate described reference voltage.
In the present invention one specific embodiment, described controller may further include: mode detection module, for basis
The mode control signal received, generates the switching signal the most corresponding with at least one luminescence unit described with output.
In the present invention one specific embodiment, described controller may further include: electric current drives module, with described
Optical module, reference voltage adjustment module and the electrical connection of described mode detection module, in order to according to described switching signal and institute
State regulation reference voltage respectively to the driving electric current that the output of corresponding described luminescence unit is corresponding.
In the present invention one specific embodiment, described switching signal include ON signal that luminescence unit corresponding to order light with
And the OFF signal that luminescence unit corresponding to order extinguishes, and when all described switching signals are ON signal or described switching signal
In at least while have two when being ON signal, described reference voltage adjustment module according to the voltage-regulation pattern selected to institute
State reference voltage to be adjusted.
In the present invention one specific embodiment, described luminescence unit is two, when all described switching signals are out letter
Number time or described switching signal at least while have two when being ON signal, described reference voltage adjustment module is according to selection
Voltage-regulation pattern described reference voltage carried out corresponding proportion zoom in or out, to generate described regulation reference voltage.
In the present invention one specific embodiment, when described switching signal at least while existing two and being ON signal,
Described reference voltage adjustment module selects described electricity according to the number of the switching signal in described switching signal being ON signal simultaneously
Pressure shaping modes.
In the present invention one specific embodiment, described mode control signal is that a mode control module is according to the control received
Instruct and generate；And described mode control module is according to the multiple described control instruction received successively, and respectively with default
Sequential loop exports the mode control signal mated with current control instruction.
In the present invention one specific embodiment, described mode control module pre-sets the Schema control letter of an acquiescence
Number, and ought currently receive the time of described control instruction and the time phase difference of last reception control instruction more than a Preset Time
During threshold value, described mode control module is made to export the mode control signal of described acquiescence.
In the present invention one specific embodiment, described reference voltage adjustment module includes that decoding gating unit translates with described
The voltage of code gating unit electrical connection chooses the voltage regulation unit that unit electrically connects, described electricity with described decoding gating unit
Pressure regulation unit is for receiving the input of described reference voltage, and described reference voltage is adjusted to have multiple voltage size
Voltage exports, and described decoding gating unit receives the input of described switching signal, and according to described switching signal and described electricity
What pressure chose unit chooses signal, selects the one in the output of described multiple voltage to carry out defeated as described regulation reference voltage
Go out.
In the present invention one specific embodiment, described voltage is chosen unit and is included at least one resistance, current source, described electricity
One end ground connection of resistance, the other end of described resistance connects constant-current source, and described voltage chooses the unit voltage by described resistance two ends
Comparing with at least one threshold voltage and choose signal extremely described decoding gating unit with output, described resistance is adjustable electric
Resistance.
In the present invention one specific embodiment, described adjustable resistance is built-in or is external in described controller.
In the present invention one specific embodiment, described decoding gating unit includes decoding gate.
In the present invention one specific embodiment, described voltage regulation unit includes operational amplifier (UA5), field effect three pole
Pipe (N1), resistance string, described resistance string includes the resistant series at least two resistance, and described resistance string, described resistance string
One end ground connection, the other end of described resistance string connects the source electrode of described fet and described decoding gating unit,
And each resistance in described resistance string electrically connects described decoding gating unit, the positive pole input of described operational amplifier (UA5)
End receives the input of described reference voltage, the outfan of described operational amplifier (UA5) and described fet (N1)
Grid electrically connects, and the drain electrode of described fet (N1) connects power supply, the source electrode of described fet (N1) also with
Electric and the described decoding gating unit of negative input of described operational amplifier (UA5) connects.
It should be noted that in concrete implementation process, the resistance of each resistance in resistance string can identical also may be used
With difference.
In the present invention one specific embodiment, described voltage is chosen unit and is included the first voltage comparator (UA1), the second electricity
Pressure comparator (UA2), tertiary voltage comparator (UA3), resistance (R1), resistance (R2) and constant-current source (DC), described resistance
(R1) the first end ground connection, the second end described constant-current source of electrical connection (DC) of described resistance (R1) and described first voltage ratio are relatively
The electrode input end of device (UA1), the voltage of the negative input of described first voltage comparator is first threshold, described second ratio
The electrode input end of relatively device electrically connects with the second end of described resistance (R1), and the negative pole of described second voltage comparator (UA2) is defeated
The voltage entering end is Second Threshold, the first end ground connection of described resistance (R2), and the second end electrical connection of described resistance (R2) is described
Constant-current source (DC) and the electrode input end of described tertiary voltage comparator (UA3), bearing of described tertiary voltage comparator (UA3)
The voltage of pole input is the 3rd threshold value, and described first comparator (UA1), the second voltage comparator (UA2), tertiary voltage compare
Device (UA3) output chooses signal to described decoding gating unit.
In the present invention one specific embodiment, described resistance string includes resistance (RR1), resistance (RR2), resistance (RR3), electricity
Resistance (RR4) and resistance (RR5), the electrode input end of described operational amplifier (UA5) receives the input of described reference voltage,
The outfan of described operational amplifier (UA5) electrically connects with the grid of described fet (N1), described field effect three pole
Pipe (N1) grounded drain, the source electrode of described fet (N1) electrically connect with the first end of described resistance (RR5) and with
The negative input electrical connection of described operational amplifier (UA5), the second end of described resistance (RR5) and described resistance (RR4)
First end electrical connection, the second end of described resistance (RR4) electrically connects with the first end of described resistance (RR3), described resistance (RR3)
The second end electrically connect with the first end of described resistance (RR2), the second end of described resistance (RR2) and described resistance (RR1)
First end electrical connection, the second end ground connection of described resistance (RR1), described decoding gate (UA4) receives described switching signal
Input, and described decoding gate (UA4) is with the outfan of described first voltage comparator (UA1), described second voltage ratio relatively
The outfan of device (UA2), the outfan of described tertiary voltage comparator (UA3), the first end of described resistance (RR5), described electricity
Resistance first end of (RR4), the first end of described resistance (RR3), the first end of described resistance (RR2) and described resistance (RR1)
First end electrical connection, and described decoding gate (UA4) to receive described switching signal, described first voltage comparator
(UA1) the signal of outfan output, the signal and described the of the outfan output of described second voltage comparator (UA2)
The signal of the outfan output of three voltage comparators (UA3) is compiled, to select the first end of described resistance (RR5), institute
State the first end of resistance (RR4), the first end of described resistance (RR3), the first end of described resistance (RR2) and described resistance
(RR1) voltage of the one in the first end exports as described regulation reference voltage and drives module to described electric current.
For achieving the above object and other relevant purposes, the present invention also provides for a kind of illuminating circuit, including light emitting module, with
And as above controller described in any one, described light emitting module includes at least one luminescence unit, and described controller can be integrated
On chip.
For achieving the above object and other relevant purposes, the present invention also provides for a kind of control being applicable to LED drive power
Method, for dimming light emitting module, described light emitting module includes at least one luminescence unit, and described method includes: connect
Receive reference voltage and the input of switching signal；According to described switching signal, described reference voltage is regulated accordingly, and raw
Become regulation reference voltage with output.
As it has been described above, the present invention proposes a kind of illuminating circuit and the controller of application thereof and control method, wherein, controller
For dimming light emitting module, described light emitting module includes that at least one luminescence unit, described controller include with reference to electricity
Pressure adjustment module, the external reference voltage of reference voltage adjustment module and switching signal, in order to according to described switching signal, to institute
State reference voltage to regulate accordingly, and generate regulation reference voltage with output.The i.e. present invention can be according to different switch letters
Number, reference voltage is adjusted, and then the luminous situation of regulation luminescence unit, improving product intelligent also improves user's body
Test.
Accompanying drawing explanation
Fig. 1 is shown as the structural representation of controller of the prior art.
Fig. 2 is shown as the controller of present invention structural representation in one embodiment.
Fig. 3 is shown as the reference voltage adjustment module of present invention structural representation in one embodiment.
Fig. 4 is shown as the reference voltage adjustment module of present invention circuit theory schematic diagram in one embodiment.
Fig. 5 is shown as the mode detection module of present invention circuit theory schematic diagram in one embodiment.
Fig. 6 is shown as signal condition schematic diagram in the present invention one specific embodiment.
Fig. 7 is shown as the electric current of the present invention and drives module circuit theory schematic diagram in one embodiment.
Fig. 8 is shown as part signal waveform diagram in the present invention one specific embodiment.
Fig. 9 is shown as the circuit theory schematic diagram of illuminating circuit in the present invention one specific embodiment.
Figure 10 is shown as the control method of present invention schematic flow sheet in one embodiment.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also be by the most different concrete realities
The mode of executing is carried out or applies, the every details in this specification can also based on different viewpoints and application, without departing from
Various modification or change is carried out under the spirit of the present invention.It should be noted that, in the case of not conflicting, following example and enforcement
Feature in example can be mutually combined.
It should be noted that the diagram provided in following example illustrates the basic structure of the present invention the most in a schematic way
Think, component count, shape and size when then only showing the assembly relevant with the present invention rather than implement according to reality in diagram
Drawing, during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout kenel is also
It is likely more complexity.
Controller of the prior art is usually as it is shown in figure 1, described controller 1 includes the benchmark electricity providing reference voltage
Press generation module R1, the mode detection module R2 that light-emitting mode is detected and light emitting module is carried out electric current driving
Electric current drives module R3, in the prior art, generates double switch signal after mode detection module R2 detection light-emitting mode, and
Electric current drives module R3 to drive two luminescence units of external light emitting module respectively according to double switch signal the most respectively
Dynamic, in concrete application, two-way luminescence unit can respectively send the luminescence unit of white light and send the luminescence unit of gold-tinted,
In actual applications, user can pass through model selection, selects one in two luminescence units to light the point reaching to want
Bright effect, it is also possible to select simultaneously to light this two-way luminescence unit, when lighting this two-way luminescence unit simultaneously, two-way luminescence list
Unit illumination effect be overlapped, human eye can substantially realize when both light simultaneously brighter than white light or gold-tinted a lot, brightness jump
Become very big, be likely to result in the discomfort of human eye, and if user just hope and simple exchange lower colour temperature, also can not reach to want
Result.
Refer to Fig. 2, be shown as the controller of present invention module diagram in one embodiment.Described controller
2 for dimming light emitting module, and described light emitting module includes that multiple luminescence unit, described luminescence unit are preferably LED group
Becoming, described controller 2 includes:
Reference voltage adjustment module U2, an external reference voltage and switching signal, in order to according to described switching signal, to institute
State reference voltage to regulate accordingly, and generate regulation reference voltage with output；In order to according to described mode detection module U3
Output described switching signal, described reference voltage REF is regulated accordingly, and generate regulation reference voltage REF_O with
Output.
Further, described controller 2 also includes reference voltage generation module U1 and mode detection in the present embodiment
Module U3, described reference voltage generation module U1 and mode detection module U3 is electrically connected with described reference voltage adjustment module U2
Connecing, described reference voltage generation module U1 is in order to generate reference voltage REF；Described mode detection module U3 is for according to receiving
Mode control signal, generate the switching signal respectively the most corresponding with the plurality of luminescence unit to export；The most described switching signal
Number identical with the number of described luminescence unit, and, each switching signal correspondence controls the off and on of riches all the way light unit.
And, in the present embodiment, illustrate as a example by there is two-way luminescence unit.And have refering to Fig. 2, described mode detection module U3
Receive the input port DET of mode control signal, and exported deserved switching signal by port G1 and G2.
Further, in the present embodiment, described controller 2 also includes that electric current drives module U4, with described light emitting module
(not shown in Fig. 2), reference voltage adjustment module U2 and described mode detection module U3 electrical connection, in order to according to described mould
The described switching signal of formula detection module U3 output and the described regulation of described reference voltage adjustment module U2 output are with reference to electricity
Pressure is respectively to the driving electric current that the output of corresponding described luminescence unit is corresponding.In the present embodiment, described electric current drives module U4
By driving current output terminal mouth IO1 and IO2 to corresponding luminescence unit output driving current.
In the present embodiment, described switching signal includes the ON signal making corresponding luminescence unit light and makes correspondence
The OFF signal that luminescence unit extinguishes, and when all described switching signals are ON signal or in described switching signal at least while
Have two when being ON signal, described reference voltage adjustment module U2 according to the voltage-regulation pattern selected to described with reference to electricity
Pressure is adjusted.In concrete application, described reference voltage adjustment module U2 according to the voltage-regulation pattern selected to described ginseng
Examine voltage and carry out zooming in or out of corresponding proportion, to generate described regulation reference voltage REF_O.Described selectable voltage is adjusted
Joint pattern, for example, according to the regulation to adjustable resistance, selects to carry out reference voltage REF the scaling of different proportion,
In another specific embodiment of the present invention, it is ON signal when described switching signal at least while exists two
Time, described reference voltage adjustment module selects described according to the number of the switching signal in described switching signal being ON signal simultaneously
Voltage-regulation pattern.Such as, when described switching signal is 5, and two when being ON signal simultaneously, selects described regulation reference
Voltage REF_O is adjusted to 0.75 times of reference voltage REF, when being ON signal for three simultaneously, selects described regulation with reference to electricity
Pressure REF_O is adjusted to 0.55 times of reference voltage REF.
In the present invention one specific embodiment, described mode control signal is that a mode control module is according to the control received
Instruct and generate；And described mode control module is according to the multiple described control instruction received successively, and respectively with default
Sequential loop exports the mode control signal mated with current control instruction.It is such as two-way when described luminescence unit, and a road
Luminescence unit emits white light, riches all the way light unit Yellow light-emitting low temperature, and according to the control instruction received successively, and it is corresponding to light white light respectively
Luminescence unit that luminescence unit, gold-tinted are corresponding and simultaneously light luminescence unit corresponding to white light and luminescence corresponding to gold-tinted
Unit.
In the present invention one specific embodiment, described mode control module pre-sets the Schema control letter of an acquiescence
Number, and ought currently receive the time of described control instruction and the time phase difference of last reception control instruction more than a Preset Time
During threshold value, described mode control module is made to export the mode control signal of described acquiescence.As in figure 2 it is shown, switching signal and pattern
The state of port G1 with G2 of detection module U3 is corresponding, and in the present embodiment, described preset time threshold is 10s, described silent
The switching signal of the mode control signal correspondence acquiescence recognized, and under these default conditions, G1 be on, G2 be off, when opening again after shutdown
And interval time less than 10s time, the state of switching G1 and G2 corresponding to the second mode control signal, i.e. G1 is that off, G2 are
On, when opening after shutdown and interval time is less than 10s, switches the shape of G1 and G2 corresponding to the third mode control signal again
State, i.e. G1 be on, G2 be on, and in the case of opening the most again, it is judged that with being separated by of the action that the last time performs pass, start
Time more than 10s time, output acquiescence mode control signal, i.e. return to G1 be on, G2 be the state of off.
In conjunction with Fig. 3, described reference voltage adjustment module U2 includes decoding gating unit U21 and described decoding gating unit
The voltage of U21 electrical connection chooses the voltage regulation unit U23 that unit U22 electrically connects with described decoding gating unit U21, described
Voltage regulation unit U23 is for receiving the input of described reference voltage REF, and is adjusted to have many by described reference voltage REF
Planting the voltage output of voltage swing, described decoding gating unit U21 receives the input of described switching signal, and according to described switch
What signal and described voltage chose unit U22 chooses signal, selects the one in the output of described multiple voltage as described tune
Joint reference voltage REF_O exports.
With further reference to Fig. 4, it is shown as the circuit structure of reference voltage adjustment module in the present invention one specific embodiment and shows
It is intended to.Described voltage is chosen unit U22 and is included at least one resistance, current source, one end ground connection of described resistance, described resistance
The other end connects constant-current source, and described voltage is chosen unit and compared with at least one threshold voltage by the voltage at described resistance two ends
Relatively choosing signal extremely described decoding gating unit with output, described resistance is adjustable resistance.Wherein, described adjustable resistance built-in or
It is external in described controller.And in embodiment illustrated in fig. 4, described voltage is chosen unit U22 and is included the first voltage comparator
UA1, the second voltage comparator UA2, tertiary voltage comparator UA3, resistance R1, resistance R2 and constant-current source DC；Described decoding choosing
Logical unit U21 includes that decoding gate UA4, described voltage regulation unit U23 includes operational amplifier UA5, fet
N1, resistance string, described resistance string includes the resistant series at least two resistance, and described resistance string, the one of described resistance string
End ground connection, the other end of described resistance string connects the source electrode of described fet and described decoding gating unit, and institute
State each resistance in resistance string and electrically connect described decoding gating unit, concrete, described resistance string in the present embodiment by electricity
Resistance RR1, resistance RR2, resistance RR3, resistance RR4 and resistance RR5 are composed in series, and described resistance R1 and described resistance R2 is
Adjustable resistance.
In implementing, resistance R1 and R2 can be built-in or be external in chip.
In the present invention one specific embodiment, the first end ground connection of described resistance R1, second end of described resistance R1 is electrically connected
Connecing described constant-current source DC and the electrode input end of described first voltage comparator UA1, described first voltage comparator UA1's is negative
The voltage of pole input is first threshold, and in this specific embodiment, described first threshold is 1V, and described second comparator is just
Pole input electrically connects with second end of described resistance R1, and the voltage of the negative input of described second voltage comparator UA2 is
Second Threshold, in this specific embodiment, described Second Threshold is 2V, the first end ground connection of described resistance R2, described resistance R2
The second end electrically connect described constant-current source DC and the electrode input end of described tertiary voltage comparator UA3, described tertiary voltage
The voltage of the negative input of comparator UA3 is the 3rd threshold value, and in this specific embodiment, described 3rd threshold value is 1V, described
The electrode input end of operational amplifier UA5 receives the input of described reference voltage, the outfan of described operational amplifier UA5 and institute
State the grid electrical connection of fet N1, the grounded drain of described fet N1, described fet N1
Source electrode electrically connect with first end of described resistance RR5 and electrically connect with the negative input of described operational amplifier UA5, described
Second end of resistance RR5 electrically connects with first end of described resistance RR4, and second end of described resistance RR4 is with described resistance RR3's
First end electrical connection, second end of described resistance RR3 electrically connects with first end of described resistance RR2, the second of described resistance RR2
End electrically connects with first end of described resistance RR1, and the second end ground connection of described resistance RR1, described decoding gate UA4 receives institute
State the input of switching signal, and described decoding gate UA4 and the outfan of described first voltage comparator UA1, described second
The outfan of voltage comparator UA2, the outfan of described tertiary voltage comparator UA3, first end of described resistance RR5, described
First end of resistance RR4, first end of described resistance RR3, first end of described resistance RR2 and the first of described resistance RR1
End electrical connection, and described decoding gate UA4 to receive described switching signal, the output of described first voltage comparator UA1
Hold the signal of the outfan output of the signal of output, described second voltage comparator UA2 and described tertiary voltage comparator
The signal of the outfan output of UA3 is compiled, with select by first end of described resistance RR5, the first of described resistance RR4
One in first end of end, first end of described resistance RR3, first end of described resistance RR2 and described resistance RR1
Voltage exports as described regulation reference voltage and drives module to described electric current.
In the present embodiment, the electric current that described constant-current source provides is ib1, and electric current flows into resistance R1, produces pressure drop VR1, RD1
It is connected to two comparator UA1, the anode of UA2, the negative termination voltage ref1 of UA1, UA2 comparator, and ref2.
V (RD1)=ib1*R1；
When RD1 voltage is less than ref1 then comparator UA1 output low level, UA2 output low level；A=B=0
When RD1 voltage is higher than ref1 and is less than ref2, then comparator UA1 exports high level, UA2 output low level；A=
1, B=0
When RD1 voltage exports high level higher than ref2 then comparator UA1, and UA2 exports high level；A=B=1
Ib2 electric current flows into resistance R2, produces pressure drop VR2, RD2 and is connected to the anode of comparator UA3, bearing of UA3 comparator
Termination voltage ref3.
V (RD2)=ib2*R2；
When RD2 voltage is less than ref3 then comparator UA3 output low level；C=0
When RD2 voltage exports high level higher than ref3 then comparator UA3；C=1
Thus can pass through comparator UA1, the output identification RD1 of UA2, UA3, which the outer meeting resistance impedance of RD2 pin is in
Individual region.
UA5 output drives NMOS, feeds back to connect under amplifier negative terminal, NMOS divider resistance RR1～RR5.
Below with ref1=1V, as a example by ref2=2v, ref3=1v, the output voltage situation of a, b, c, d, e each point is described:
A=REF；
B=REF* (RR1+RR2+RR3+RR4)/(RR1+RR2+RR3+RR4+RR5)=0.85*REF；
C=REF* (RR1+RR2+RR3)/(RR1+RR2+RR3+RR4+RR5)=0.75*REF；
D=REF* (RR1+RR2)/(RR1+RR2+RR3+RR4+RR5)=0.65*REF；
E=REF* (RR1)/(RR1+RR2+RR3+RR4+RR5)=0.5*REF；
I.e. in this illustration, it is provided that 50%, 65%, 75%, 85% and 100% these five kinds of voltage-regulation moulds
Formula, i.e. regulation reference voltage is adjusted to the 50% of reference voltage, 65%, 75%, 85% and 100% respectively.
In other implementations, the resistance of any one resistance in R1, R2 and resistance string can be regulated, to change tune
Save reference voltage REF, and regulation reference voltage REF can be adjusted to the arbitrary proportion of reference voltage.
When being high level when working as G1, G2 difference, REF_O=REF.When G1=G2=high level, RD1 outer meeting resistance R1,
RD2 outer meeting resistance R2, REF_O output voltage:
In this specific embodiment, the structure of described mode detection module U3 is as it is shown in figure 5, described mode detection module
U3 includes that switching signal output unit UB1 and low level detector unit UB2, switching signal output unit UB1 have reception mould
The input port DET of formula control signal, and there is output port G1 and G2 of switching signal, described low level detector unit UB2
Detect the low level time of described mode control signal, and when low level time is more than a threshold value, by RST port to opening
OFF signal output unit UB1 sends reset signal.Described mode detection module U3 receives external switch module by DET port
The mode control signal sent, makes G1 with G2 switching signal corresponding to output, signal condition as shown in Figure 6, when DET low level
Time, G1, G2 low level, after the high level pulse of the quantity that DET input is different, G1, G2 are switched in order by above figure.First
Pulse G1 high level, G2 low level, second pulse G1 low level, G2 high level, the 3rd pulse G1, G2 is all high level,
4th pulse returns state G1 high level and the low level state of G2, by that analogy.Low level detector unit UB2 module is used
Detect in low level time, when the DET time is more than 10S, export reset signal RST, reset UB1 module, even UB1 resets, under
During secondary DET high level again, start again from the 1st state (the present embodiment, first state is G1 high level, G2 low level)
Counting.
Further regarding to shown in Fig. 7, the electric current being shown as the present invention drives module circuit in one embodiment former
Reason schematic diagram.Described electric current drives module U4 to include comparator UC1, comparator UC2, fet N2, field effect three pole
Pipe N3, resistance R3 and resistance R4, the electrode input end of described comparator UC1 is connected with REF_O, and described comparator UC1's is negative
Pole electrically connects with the source electrode of described fet N2, the outfan of described comparator UC1 and described fet N2
Grid electrical connection, the source electrode of described fet N2 pass through described resistance R3 ground connection, the Enable Pin of described comparator UC1
Receiving the input of described switching signal G1, the drain electrode of described fet N2 is by inductance L1 and first via luminescence unit
Input electrically connects, and provides constant current input for first via luminescence unit.The electrode input end of described comparator UC2 is with REF_O even
Connecing, the negative pole of described comparator UC2 electrically connects with the source electrode of described fet N3, the outfan of described comparator UC2
Electrically connecting with the grid of described fet N3, the source electrode of described fet N3 passes through described resistance R4 ground connection,
The Enable Pin of described comparator UC2 receives the input of described switching signal G2, and the drain electrode of described fet N3 is by electricity
The input electrical connection of sense L2 and the second road luminescence unit, provides constant current input for the second road luminescence unit.And, IL1 is inductance
The current waveform of L1, A1 is the switch controlling signal of fet N2, and CS1 is the voltage wave of the ungrounded end of resistance R3
Shape, ILED is the current waveform of LED in the luminescence unit connected by inductance L1, and in a particular application, IL1, A1, CS1, with
And the waveform of ILED is as shown in Figure 8, REF_O DC reference voltage input comparator UC1, UC2 comparator anode, resistance under CS1
R3 connects feedback resistance, when CS1 voltage less than REF_O be comparator output high level open N1, CS1 is charged, the low electricity of IO1
Flat, it is electrically charged close to 0V, inductance L1, after CS1 voltage reaches REF_O, N1, D1 high level, IO1 are closed in comparator UC1 upset
Carry out clamper by DD1 to be discharged at voltage HV, inductance L1.After inductive discharge terminates, IO1 jumps low level, and N1 reopens,
Inductive current peak voltage REF_O/CS1, is zero after discharge off, and inductance average current is 0.5* (REF_O/CS1), inductance electricity
Stream all flows through LED string, just can control the average current of LED string with this, L1 and C1 constitutes the further mistake of filter circuit
The electric current of LED is flow through in filter.G1 is switching signal, and high level works, and low level quits work.
ILED=0.5* (REF_O/CS1)；
It is above the type of drive that first via luminescence unit is luminous, and by comparator UC2, resistance R4 and field effect
The driving principle of the drive circuit of the second road luminescence unit of audion N3, inductance L2 composition and the luminescence of first via luminescence unit
Driving principle and type of drive are similar to, not repeated description at this.
Further regard to Fig. 9, be shown as the principle schematic of illuminating circuit in the present invention one specific embodiment.Described luminescence
Circuit 3 includes controller 2 as shown in Figure 2 and receives the light emitting module 31 that described controller 2 dims and drives, described control
Device 2 processed can be integrated on chip.In the present embodiment, described light emitting module 31 includes two luminescence units, i.e. luminescence units
311 and luminescence unit 312, also include that constant-current source DC, luminescence unit 311 include diode DD1, electric capacity C1 and multiple series connection
LED, the negative electrode of the anode of diode DD1 and the LED connected electrically connects, the anode of the negative electrode of diode DD1 and the LED connected
Electrically connecting, and electric capacity C1 is connected in parallel on the two ends of multiple LED being connected in series, the negative electrode of multiple LED being connected in series passes through inductance
L1 receives the current drive signal that described electric current drives module U4 to send, and the positive pole of the negative electrode of diode DD1 and constant-current source DC
Electrical connection, the minus earth of constant-current source DC, the circuit structure of luminescence unit 312 is similar with luminescence unit 312, in conjunction with luminous single
Structure shown by the description of unit 311 and accompanying drawing 9 can draw, is not added with at this repeating.
Further regard to Figure 10, be shown as the control method of present invention schematic flow sheet in one embodiment.Institute
Stating control method for dimming light emitting module, described light emitting module includes at least one luminescence unit, described method bag
Include:
S11: receive reference voltage and the input of switching signal；
S12: according to described switching signal, described reference voltage is regulated accordingly, and generate regulation reference voltage
With output.
Described control method is corresponding with the operation principle of described controller 2, the work of above-mentioned all about described controller 2
Make the description of principle, all can be applicable in the present embodiment.
In sum, the present invention proposes a kind of illuminating circuit and the controller of application thereof and control method, wherein, controller
For dimming light emitting module, described light emitting module includes that at least one luminescence unit, described controller include with reference to electricity
Pressure adjustment module, the external reference voltage of reference voltage adjustment module and switching signal, in order to according to described switching signal, to institute
State reference voltage to regulate accordingly, and generate regulation reference voltage with output.The i.e. present invention can be according to different switch letters
Number, reference voltage is adjusted, and then the luminous situation of regulation luminescence unit, improving product intelligent also improves user's body
Test.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any ripe
Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage knowing this technology.Cause
This, have usually intellectual such as complete with institute under technological thought without departing from disclosed spirit in art
All equivalences become are modified or change, and must be contained by the claim of the present invention.
Claims (18)
1. the controller being applicable to LED drive power, it is characterised in that for light emitting module is dimmed, described
Optical module includes that at least one luminescence unit, described controller include:
Reference voltage adjustment module, an external reference voltage and switching signal, in order to according to described switching signal, to described reference
Voltage regulates accordingly, and generates regulation reference voltage with output.
Controller the most according to claim 1, it is characterised in that: described controller also includes: reference voltage generation module,
In order to generate described reference voltage.
Controller the most according to claim 1 and 2, it is characterised in that: described controller also includes: mode detection module,
For according to the mode control signal received, generate the switching signal the most corresponding with at least one luminescence unit described with defeated
Go out.
Controller the most according to claim 3, it is characterised in that: described controller also includes: electric current drives module, with institute
State light emitting module, reference voltage adjustment module and described mode detection module electrical connection, in order to according to described switching signal with
And described regulation reference voltage is respectively to the driving electric current that the output of corresponding described luminescence unit is corresponding.
5. according to the controller described in claim 1 or 3, it is characterised in that: described switching signal includes the luminous list that order is corresponding
ON signal that unit lights and the OFF signal that luminescence unit corresponding to order extinguishes, and when all described switching signals are ON signal
Time or described switching signal at least while have two when being ON signal, described reference voltage adjustment module is according to selecting
Described reference voltage is adjusted by voltage-regulation pattern.
Controller the most according to claim 4, it is characterised in that: described luminescence unit is two, when all described switches
At least while having two when being ON signal when signal is ON signal or in described switching signal, described reference voltage regulates
Module carries out corresponding proportion according to the voltage-regulation pattern selected to described reference voltage and zooms in or out, to generate described tune
Joint reference voltage.
Controller the most according to claim 6, it is characterised in that: when described switching signal at least while existing two all
During for ON signal, described reference voltage adjustment module is according to the number of switching signal in described switching signal being ON signal simultaneously
Select described voltage-regulation pattern.
Controller the most according to claim 3, it is characterised in that: described mode control signal is a mode control module root
Generate according to the control instruction received；And described mode control module is according to the multiple described control instruction received successively, and
The mode control signal that circulation output is mated with current control instruction the most in a predetermined sequence.
Controller the most according to claim 8, it is characterised in that: described mode control module pre-sets an acquiescence
Mode control signal, and ought currently receive time of described control instruction and surpass with the last time phase difference receiving control instruction
When crossing a preset time threshold, described mode control module is made to export the mode control signal of described acquiescence.
Controller the most according to claim 1, it is characterised in that: described reference voltage adjustment module includes decoding gating
The voltage that unit electrically connects with described decoding gating unit chooses the voltage tune that unit electrically connects with described decoding gating unit
Joint unit, described voltage regulation unit is for receiving the input of described reference voltage, and is adjusted to described reference voltage to have
The voltage output of multiple voltage size, described decoding gating unit receives the input of described switching signal, and according to described switch
What signal and described voltage chose unit chooses signal, selects the one in the output of described multiple voltage as described regulation ginseng
Examine voltage to export.
11. controllers according to claim 10, it is characterised in that: described voltage is chosen unit and is included at least one electricity
Resistance, current source, one end ground connection of described resistance, the other end of described resistance connects constant-current source, and described voltage chooses unit by institute
Voltage and at least one threshold voltage of stating resistance two ends compare and choose signal to described decoding gating unit, institute with output
Stating resistance is adjustable resistance.
12. controllers according to claim 11, it is characterised in that: described adjustable resistance is built-in or is external in described control
Device.
13. controllers according to claim 10, it is characterised in that: described decoding gating unit includes decoding gate.
14. controllers according to claim 11, it is characterised in that: described voltage regulation unit includes operational amplifier
(UA5), fet (N1), resistance string, described resistance string includes the resistance at least two resistance, and described resistance string
Series connection, one end ground connection of described resistance string, the other end of described resistance string connects source electrode and the institute of described fet
State each resistance in decoding gating unit, and described resistance string and electrically connect described decoding gating unit, described operational amplifier
(UA5) electrode input end receives the input of described reference voltage, and the outfan of described operational amplifier (UA5) is imitated with described field
The grid answering audion (N1) electrically connects, and the drain electrode of described fet (N1) connects power supply, described fet
(N1) also electric and described with the negative input of described operational amplifier (UA5) the decoding gating unit of source electrode is connected.
15. controllers according to claim 14, it is characterised in that: described voltage is chosen unit and is included the first voltage ratio relatively
Device (UA1), the second voltage comparator (UA2), tertiary voltage comparator (UA3), resistance (R1), resistance (R2) and constant-current source
(DC), the first end ground connection of described resistance (R1), the second end of described resistance (R1) electrically connects described constant-current source (DC) and institute
Stating the electrode input end of the first voltage comparator (UA1), the voltage of the negative input of described first voltage comparator is first
Threshold value, the electrode input end of described second comparator electrically connects with the second end of described resistance (R1), and described second voltage ratio is relatively
The voltage of the negative input of device (UA2) is Second Threshold, the first end ground connection of described resistance (R2), the of described resistance (R2)
Two ends electrically connect described constant-current source (DC) and the electrode input end of described tertiary voltage comparator (UA3), described tertiary voltage
The voltage of the negative input of comparator (UA3) is the 3rd threshold value, described first comparator (UA1), the second voltage comparator
(UA2), tertiary voltage comparator (UA3) output chooses signal to described decoding gating unit.
16. controllers according to claim 15, it is characterised in that: described resistance string includes resistance (RR1), resistance
(RR2), resistance (RR3), resistance (RR4) and resistance (RR5), the electrode input end of described operational amplifier (UA5) receives institute
Stating the input of reference voltage, the outfan of described operational amplifier (UA5) is electrically connected with the grid of described fet (N1)
Connect, the grounded drain of described fet (N1), the source electrode of described fet (N1) and described resistance (RR5)
First end electrical connection and electrically connect with the negative input of described operational amplifier (UA5), the second end of described resistance (RR5) and
First end electrical connection of described resistance (RR4), the second end of described resistance (RR4) is electrically connected with the first end of described resistance (RR3)
Connecing, the second end of described resistance (RR3) electrically connects with the first end of described resistance (RR2), the second end of described resistance (RR2) with
First end electrical connection of described resistance (RR1), the second end ground connection of described resistance (RR1), described decoding gate (UA4) receives
The input of described switching signal, and described decoding gate (UA4) and the outfan of described first voltage comparator (UA1), institute
State the outfan of the second voltage comparator (UA2), the outfan of described tertiary voltage comparator (UA3), described resistance (RR5)
First end, the first end of described resistance (RR4), the first end of described resistance (RR3), the first end of described resistance (RR2) and
First end electrical connection of described resistance (RR1), and the described decoding gate (UA4) the described switching signal to receiving, described the
The letter that the signal of outfan output of one voltage comparator (UA1), the outfan of described second voltage comparator (UA2) export
Number and described tertiary voltage comparator (UA3) outfan output signal be compiled, with select by described resistance
(RR5) the first end, the first end of described resistance (RR4), the first end of described resistance (RR3), the first of described resistance (RR2)
The voltage of the one in the first end of end and described resistance (RR1) exports to described electric current as described regulation reference voltage
Drive module.
17. 1 kinds of illuminating circuits, it is characterised in that include light emitting module, and as according to any one of claim 1～16
Controller, described light emitting module includes that at least one luminescence unit, described controller can be integrated on chip.
18. 1 kinds of control methods being applicable to LED drive power, it is characterised in that for light emitting module is dimmed, described
Light emitting module includes that at least one luminescence unit, described method include:
Receive reference voltage and the input of switching signal；
According to described switching signal, described reference voltage is regulated accordingly, and generate regulation reference voltage with output.
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| CN106304509B (en) | 2018-05-22 |
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