CN106793317A - Light adjusting circuit, light-dimming method and LED drive circuit - Google Patents
Light adjusting circuit, light-dimming method and LED drive circuit Download PDFInfo
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- CN106793317A CN106793317A CN201611254108.9A CN201611254108A CN106793317A CN 106793317 A CN106793317 A CN 106793317A CN 201611254108 A CN201611254108 A CN 201611254108A CN 106793317 A CN106793317 A CN 106793317A
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Classifications
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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]
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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
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
-
- 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]
- H05B45/40—Details of LED load circuits
Abstract
The invention discloses a kind of light adjusting circuit, light-dimming method and LED drive circuit, the present invention, according to the dim signal, produces multiple current reference signals corresponding with multichannel loading on the basis of dimmer for light control, to change the ratio of each road load current, so as to realize the regulation of colour temperature；Dim signal may be used to characterize dimmer switch switching or light modulation velocity variations, latches the ratio of current each road load current or latches a default load current ratio.The present invention directly can adjust colour temperature by light modulator, and without using MCU, compatibility is good, and reduces cost.
Description
Technical field
The present invention relates to electric and electronic technical field, and in particular to a kind of light adjusting circuit, light-dimming method and LED drive electricity
Road.
Background technology
Light modulator is widely used in lighting field, by taking controllable silicon dimmer (TRIAC) as an example, by its angle of flow
Regulation so that the input voltage of regulating load, load current respective change is realizing light modulation.LED is substituting conventional light source
During, it is capable of the application of compatible silicon controlled light modulation, therefore controllable silicon dimmer can be equally applied in LED drive circuit.
In the prior art, although controllable silicon dimmer realizes the light modulation of LED, but in the application scenario of colour temperature regulation,
Then colour temperature regulation cannot be carried out by controllable silicon dimmer.As shown in figure 1, in illustrating the prior art using controllable silicon dimmer
LED drive circuit, LED1 and LED2 is two loads of parallel connection, and respectively changes in temperature are photochromic, by controllable silicon dimmer adjust
The input voltage of LED1 and LED2, so that its average output current is correspondingly adjusted, but only by the regulation of thyristor operating angle
The colour temperature of LED1 and LED2 is not influenceed.Accordingly, it would be desirable to separately set colour temperature adjusts circui, mainly adjusted by single-chip microcomputer (MCU)
The dutycycle of two-way load, i.e., the break-make of controlling switch S1 and S2 adjusts dutycycle respectively, so as to realize that colour temperature is adjusted.
It is above-mentioned to illustrate existing light regulating technology only by taking controllable silicon as an example, but its technical problem for existing is prevalent in greatly
Most light modulators.It can be seen that, in the above prior art, match somebody with somebody therewith, it is necessary to set corresponding communication module due to being provided with MCU
Close, for example, the module such as bluetooth, wifi, system cost is higher；And brightness and the tune of regulation light cannot be simultaneously realized using light modulator
Section colour temperature.
The content of the invention
A kind of light adjusting circuit that colour temperature regulation is realized using controllable silicon dimmer, light-dimming method and LED are provided and drive electricity
Road, is used to solve cannot being adjusted using controllable silicon for prior art presence, and relatively costly technical problem.
Technical solution of the invention is to provide a kind of light adjusting circuit of following structure, including reference signal produces electricity
Road, the reference signal generation circuit receives dim signal, and the reference signal generation circuit produces multiple and multichannel loading pair
The current reference signal answered, described current reference signal characterizes the reference current of respective load, according to described current reference
Signal, to adjust the ratio of each road load current.
Alternatively, described multichannel loading is in series with linear regulating circuit respectively, and described linear regulating circuit is by adopting
The load current of the corresponding road load of sample, and be compared with current reference signal, to adjust the load current on the road so that load
Electric current levels off to the current value that the current reference signal is characterized.
Alternatively, described multichannel loading is in series with on-off circuit respectively, and phase is produced according to described current reference signal
The duty cycle signals answered, described duty cycle signals load electricity as the control signal of corresponding path switching circuit to adjust each road
The ratio of stream.
Alternatively, the dim signal change, total load current respective change, according to the size of total load current, it is determined that
Each road characterizes the size of the current reference signal of load current, to change the ratio of each road load current.
Alternatively, described reference signal generation circuit includes amplifier circuit and comparison circuit, and described sampling is put
Dim signal or total load current described in big circuit sampling, and processed through operational amplifier, amplifier signal is obtained, it is described
Comparison circuit includes and loads one-to-one multichannel comparing unit, two inputs of each comparing unit are received respectively
The amplifier signal and ramp signal, and export duty cycle signals corresponding with respective load, described duty cycle signals
Control end with the on-off circuit is connected.
Alternatively, described reference signal generation circuit includes reference generating circuit and benchmark distributor circuit, described base
Standard produces circuit to receive and characterizes the signal that each road loads negative terminal voltage, obtains characterizing the reference signal of total load current, described
Benchmark distributor circuit receives the allocation proportion for characterizing the reference signal of total load current, and determining each road load current, with
Export corresponding current reference signal.
Alternatively, the light modulation speed according to light modulator or switch motion, latch the ratio or lock of current each road load current
A default load current ratio is deposited, is not changed load current ratio when being dimmed to light modulator after latch and is only changed total negative
Current-carrying size.
Alternatively, when load current proportion adjustment is recovered, the load current ratio that will have been latched is used as current load
Current ratio, and pass through light modulator regulating load current ratio on this basis.
Another technical solution of the invention is to provide a kind of light-dimming method of following steps, comprises the following steps：
Sampling dim signal, according to the described multiple current reference signals corresponding with multichannel loading of dim signal generation；
Described current reference signal characterizes the reference current of corresponding road load, according to described current reference signal, with
The load current of multichannel loading is adjusted, to change the ratio of each road load current.
Another technical solution of the invention is to provide a kind of LED drive circuit of following structure, including any of the above
A kind of light adjusting circuit.
Using structures and methods of the invention, compared with prior art, with advantages below：The present invention is in dimmer for light control
On the basis of, according to the dim signal, multiple current reference signals corresponding with multichannel loading are produced, loaded with changing each road
The ratio of electric current, so as to realize the regulation of colour temperature；Dim signal may be used to characterize dimmer switch switching or light modulation velocity variations,
Latch the ratio of current each road load current or latch a default load current ratio.The present invention can directly pass through light modulator
To adjust colour temperature, without using MCU, compatibility is good, and reduces cost.
Brief description of the drawings
Fig. 1 is the structural representation of the LED drive circuit of the application controllable silicon dimmer of prior art；
Fig. 2 is the structural representation of the LED drive circuit of application controllable silicon dimmer of the invention.
Fig. 3 is the schematic diagram for increasing latch function on the light adjusting circuit of Fig. 2；
Fig. 4 is the structural representation of the first implementation method of reference signal generation circuit of the invention；
Fig. 5 is the structural representation of improved another implementation method on the basis of Fig. 4；
Fig. 6 is the structural representation of second implementation method of reference signal generation circuit of the invention；
Fig. 7 is the structural representation of the third implementation method of reference signal generation circuit of the invention.
Specific embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any replacement made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order that the public has to the present invention thoroughly understanding, it is described in detail in present invention below preferred embodiment specific
Details, and description without these details can also completely understand the present invention for a person skilled in the art.
The present invention is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing is adopted
Non- accurately ratio is used with the form for more simplifying and, is only used to convenience, lucidly aided in illustrating the embodiment of the present invention
Purpose.
With reference to shown in Fig. 2, the structure of the LED drive circuit of present invention application controllable silicon dimmer is illustrated.LED drives electricity
Road includes controllable silicon dimmer TRIAC, rectifier bridge and power-switching circuit AC/DC, described controllable silicon dimmer TRIAC receptions
Exchange input, is input into power-switching circuit AC/DC after rectified bridge rectification, and the output end of power-switching circuit AC/DC is connected
Load.For the convenience for illustrating, by taking the LED load of two-way as an example, i.e. LED1 and LED2 is two loads of parallel connection, respectively cold
Warm light color, by the output average current of controllable silicon dimmer regulation power supply change-over circuit AC/DC, just can realize light modulation.
Reference current generating circuit VREFDim signal is received, described dim signal characterizes controllable silicon dimmer switch and cuts
Change or angle of flow change, for example, light modulator is actually turned on angle or shut-off angle, total input current etc. of load can be as tune
Optical signal.The reference signal generation circuit VREFTwo are produced with the two-way corresponding current reference signal of load, described electric current
Reference signal characterizes the reference current of respective load, according to described current reference signal, to adjust the load electricity of multichannel loading
Stream.
Under the application scenario of linear regulation, described two-way load is in series with linear regulating circuit respectively, opening in Fig. 2
Closing S1 and S2 can be as the adjustment pipe in linear regulating circuit, and described linear regulating circuit is by sampling what corresponding road loaded
Load current, and be compared with current reference signal, to adjust the load current on the road so that load current levels off to described
The current value that current reference signal is characterized, so that the current ratio of load LED1 and LED2 changes, realizes colour temperature
Regulation.Because being only to illustrate in accompanying drawing, so being not drawn into complete linear regulating circuit.
Under the application scenario of switch-mode regulation (i.e. PWM) regulation, described multichannel loading is in series with on-off circuit respectively, opens
Closing S1 and S2 can produce corresponding duty cycle signals, institute as easy on-off circuit according to described current reference signal
The duty cycle signals stated as corresponding path switching circuit control signal, to adjust the load current of multichannel loading.
With reference to shown in Fig. 3, illustrate to realize the schematic diagram that load current ratio is latched, i.e., on the light adjusting circuit basis of Fig. 2
On increased latch function, be applicable to various dimmer applications occasions, and the equal energy in linear regulating circuit and on-off circuit
It is applicable.Light modulation speed (for example, quickly light modulation-Fast dimming) or switch motion (ON/OFF) according to light modulator, pass through
Latch module Latch latches the ratio of current each road load current or latches a default load current ratio, right after latch
The size that load current ratio only changes total load current is not changed when light modulator is dimmed, for example, occurring in light modulator fast
Load current ratio is latched during velocity modulation light, when recovering normal light modulation speed, is not then changed load current ratio and is only changed
The size of total load current.
In system cut-off for a period of time, the load current for having latched is eliminated than regular meeting, now then reverts to default conditions
Load current ratio is adjusted.
With reference to shown in Fig. 4, reference signal generation circuit of the present invention under the application scenario of switch-mode regulation is illustrated a kind of
The structure of implementation method.Described reference signal generation circuit includes amplifier circuit and comparison circuit, and described sampling is put
Dim signal described in big circuit sampling, the total input current that will be loaded here is sampled as dim signal by resistance RS, and
One end of input operational amplifier U01, resistance R01 and R02 series connection, its common port is connected with the other end of operational amplifier U01,
The other end of resistance R01 is connected with one end of sampling resistor RS, and the other end of resistance R02 is defeated with the operational amplifier U01's
Go out end connection.The output signal of the output end of the operational amplifier U01 is that the voltage on amplifier signal, with RS is in ratio
Relation, i.e., be exaggerated treatment to the voltage on RS.The amplifier signal and ramp signal are respectively in the ratio on corresponding road
Comparing unit compared with circuit is compared.Used as one of comparing unit, its in-phase input end receives described oblique comparator U03
Slope signal, its inverting input receives the amplifier signal, and comparator U03 outputs characterize the reference current of load LED1
Duty cycle signals, are connected through driver U05 with the control end of switch M01；Comparator U04 is used as another comparing unit, and its is same
Phase input receives the amplifier signal, and its inverting input receives the ramp signal, and comparator U04 outputs characterize negative
The duty cycle signals of the reference current of LED2 are carried, is connected with the control end of switch M02 through driver U06.
With reference to shown in Fig. 5, illustrate another implementation method of reference signal generation circuit, based on Fig. 4 on the basis of change
Enter.Increased current source I1 and current source I2, described current source I1 connect with switch M01, described current source I2 with switch
M02 connects.Current source I1 and current source I2 are respectively used to limit the maximum current of the road load current.
With reference to shown in Fig. 6, reference signal generation circuit of the present invention under the application scenario of linear regulation is illustrated a kind of
The structure of implementation method.Described reference signal generation circuit includes reference generating circuit and benchmark distributor circuit, described base
It is accurate to produce circuit to receive the signal for characterizing adjustment tubulose state in each linear regulation circuit, for example, LED negative terminal voltages and adjustment are managed
Control terminal voltage, in the present embodiment, M01 and M02 obtains characterizing the base of total load current as the adjustment pipe of linear regulating circuit
Calibration signal, avoids directly being sampled using sampling resistor here total load current to obtain characterizing the reference signal of total load current,
Because there is certain delay in sampling total load current, it is impossible to feed back the change of the load current on each road in time.And, according to tune
The state of homogeneous tube, it can be determined that the pressure drop of adjustment pipe, so as to the distribution of corresponding regulation current ratio, makes adjustment pipe wherein all the way
Pressure drop reaches minimum, realizes the purpose of energy-conservation.
Described benchmark distributor circuit receives the reference signal of the sign total load current, and determines each road load current
Allocation proportion, to export corresponding current reference signal.The current reference signal of two-way load current is input into computing and puts respectively
Big device U07 and operational amplifier U08, another input of the operational amplifier U07 and operational amplifier U08 receives table respectively
The sampled signal of Zheng Gai roads load current, and cause that the load current on corresponding road levels off to by adjusting adjustment pipe M01 and M02
Corresponding current reference signal.Wherein operational amplifier U07, adjustment pipe M02 are used as the linear regulating circuit for loading LED2, computing
Amplifier U08, adjustment pipe M01 are used as the linear regulating circuit for loading LED1, resistance R03 and the sampling that resistance R04 is corresponding road
Resistance.
With reference to shown in Fig. 7, reference signal generation circuit of the present invention under the application scenario of linear regulation is illustrated another
The structure of implementation method is planted, it realizes that circuit and method are similar to Fig. 6 substantially, its reference product circuit is received and characterizes total load electricity
The sampled signal of stream, and increased bias voltage Vos.Due to increased bias voltage Vos, benchmark is completed in benchmark distributor circuit
After distribution, corresponding current reference signal is exported, bias voltage Vos is superimposed in LED2 this current reference signal all the way, it is real
Cause that the load current sum of two-way has exceeded the reference signal for characterizing total load current on border, the switch on road where load LED2
M02 is likely to occur fully on situation so that switch M02 pressure drop reach it is minimum, the switch M01 and switch M02 be line
Property regulation circuit adjustment pipe.
Although it is noted that be only added in the positive input terminal of operational amplifier U07 in figure, according to circuit theory and reality
Border situation, it is also possible to be added in its negative input end, but voltage direction needs adjustment, and the positive and negative of operational amplifier U08 can be added in
Input, you can be superimposed bias voltage on one or more.Additionally, described bias voltage could be arranged to voltage-controlled voltage
Source.
In addition, although embodiment is separately illustrated and illustrated above, but it is related to the common technology in part, in this area
Those of ordinary skill apparently, can between the embodiments be replaced and integrate, and be related to one of embodiment that record is not known
Content, then refer to another embodiment on the books.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned implementation
Modification, equivalent and improvement made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (13)
1. a kind of light adjusting circuit, including reference signal generation circuit, the reference signal generation circuit receives dim signal, described
Reference signal generation circuit produces multiple current reference signals corresponding with multichannel loading, described current reference signal to characterize phase
The reference current for answering road to load, according to described current reference signal, to adjust the ratio of each road load current.
2. light adjusting circuit according to claim 1, it is characterised in that：Described multichannel loading is in series with linear regulation respectively
Circuit, the load current that described linear regulating circuit is loaded by corresponding road of sampling, and be compared with current reference signal,
To adjust the load current on the road so that load current levels off to the current value that the current reference signal is characterized.
3. light adjusting circuit according to claim 1, it is characterised in that：Described multichannel loading is in series with switch electricity respectively
Road, described current reference signal is the duty cycle signals on corresponding road, and described duty cycle signals are used as corresponding path switching circuit
Control signal, to adjust the ratio of each road load current.
4. the light adjusting circuit according to Claims 2 or 3, it is characterised in that：The dim signal change, total load current phase
Should change, according to the size of total load current, determine that each road characterizes the size of the current reference signal of load current, it is each to change
The ratio of road load current.
5. light adjusting circuit according to claim 3, it is characterised in that：Described reference signal generation circuit is put including sampling
Big circuit and comparison circuit, dim signal or total load current described in described amplifier circuit sampling, and put through computing
Big device treatment, obtains amplifier signal, and described comparison circuit includes and loads one-to-one multichannel comparing unit, each
Two inputs of individual comparing unit receive the amplifier signal and ramp signal respectively, and export corresponding with respective load
Duty cycle signals, described duty cycle signals are connected with the control end of the on-off circuit.
6. light adjusting circuit according to claim 2, it is characterised in that：Described reference signal generation circuit is produced including benchmark
Raw circuit and benchmark distributor circuit, described reference generating circuit adjust tubulose state in receiving each linear regulation circuit of sign
Signal, obtains characterizing the reference signal of total load current, and described benchmark distributor circuit receives the sign total load current
Reference signal, and determine the allocation proportion of each road load current, to export corresponding current reference signal.
7. light adjusting circuit according to claim 2, it is characterised in that：Described reference signal generation circuit is produced including benchmark
Raw circuit and benchmark distributor circuit, described reference generating circuit receive the sampled signal for characterizing total load current, and generate table
The reference signal of total load current is levied, described benchmark distributor circuit receives the reference signal for characterizing total load current, and
Determine the allocation proportion of each road load current, to export corresponding current reference signal, current reference at least all the way wherein
Bias voltage is superimposed on signal.
8. light adjusting circuit according to claim 6, it is characterised in that：Tubulose is adjusted according in the linear regulating circuit
State, adjusts the reference signal so that the pressure drop of wherein at least adjustment pipe all the way in linear regulating circuit reaches minimum.
9. light adjusting circuit according to claim 7, it is characterised in that：Change linear regulating circuit by bias voltage to be connect
The current reference signal value of receipts so that the pressure drop of wherein at least adjustment pipe all the way in linear regulating circuit reaches minimum.
10. the light adjusting circuit according to claim 1 or 2 or 6, it is characterised in that：Light modulation speed according to light modulator is opened
Pass acts, and latches the ratio of current each road load current or latches a default load current ratio, to light modulator after latch
The size that load current ratio only changes total load current is not changed when being dimmed.
11. light adjusting circuits according to claim 10, it is characterised in that：When load current proportion adjustment is recovered, by
The load current ratio of latch passes through light modulator regulating load electric current ratio on this basis as current load current ratio
Example.
A kind of 12. light-dimming methods, comprise the following steps：
Sampling dim signal, according to the described multiple current reference signals corresponding with multichannel loading of dim signal generation；
Described current reference signal characterizes the reference current of corresponding road load, according to described current reference signal, to adjust
The load current of multichannel loading, to change the ratio of each road load current.
A kind of 13. LED drive circuits, it is characterised in that：Including any one light adjusting circuit of above claim 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611254108.9A CN106793317B (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit, light-dimming method and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611254108.9A CN106793317B (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit, light-dimming method and LED drive circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN106793317A true CN106793317A (en) | 2017-05-31 |
| CN106793317B CN106793317B (en) | 2018-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611254108.9A Active CN106793317B (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit, light-dimming method and LED drive circuit |
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| CN110392461A (en) * | 2018-04-18 | 2019-10-29 | 凹凸电子（武汉）有限公司 | Controller, light source driving circuit and the method for controlling light source module |
| CN111465141A (en) * | 2020-04-09 | 2020-07-28 | 深圳市时誉高精科技有限公司 | Alternating-current multi-path mutual-control dimmer |
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| Publication number | Publication date |
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| CN106793317B (en) | 2018-12-14 |
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