CN206365087U - Light adjusting circuit and LED drive circuit - Google Patents
Light adjusting circuit and LED drive circuit Download PDFInfo
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- CN206365087U CN206365087U CN201621474583.2U CN201621474583U CN206365087U CN 206365087 U CN206365087 U CN 206365087U CN 201621474583 U CN201621474583 U CN 201621474583U CN 206365087 U CN206365087 U CN 206365087U
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- circuit
- load current
- current
- reference signal
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Abstract
The utility model discloses a kind of light adjusting circuit and LED drive circuit, the utility model is on the basis of dimmer for light control, according to the dim signal, produces multiple current reference signals corresponding with multichannel loading, to change the ratio of each road load current, so as to realize the regulation of colour temperature；Dim signal can 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 utility model directly can adjust colour temperature by light modulator, and without using MCU, compatibility is good, and reduces cost.
Description
Technical field
The utility model is related to electric and electronic technical field, and in particular to a kind of light adjusting circuit and LED drive circuit.
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 as to adjust the input voltage of load, load current respective change is to realize 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 LED light modulation, but the application scenario adjusted in colour temperature,
Then colour temperature regulation can not be carried out by controllable silicon dimmer.As shown in figure 1, illustrating the prior art using controllable silicon dimmer
LED drive circuit, LED1 and LED2 are two loads in parallel, and respectively changes in temperature are photochromic, adjusted by controllable silicon dimmer
LED1 and LED2 input voltage, so as to correspondingly adjust its average output current, but only passes through the regulation of thyristor operating angle
LED1 and LED2 colour temperature are 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., controlling switch S1 and S2 break-make adjusts dutycycle respectively, so as to realize colour temperature regulation.
It is above-mentioned to illustrate existing light regulating technology only by taking controllable silicon as an example, but its technical problem existed is prevalent in greatly
Most light modulators.It can be seen that, in the above prior art, due to being provided with MCU, it is necessary to set corresponding communication module to match somebody with somebody therewith
Close, for example, the module such as bluetooth, wifi, system cost is higher；And light modulator can not be used while realizing brightness and the tune of regulation light
Save colour temperature.
Utility model content
A kind of light adjusting circuit and LED drive circuit that colour temperature regulation is realized using controllable silicon dimmer is provided, to solve
What certainly prior art was present can not be adjusted using controllable silicon, and the higher technical problem of cost.
Technical solution of the present utility model is to provide a kind of light adjusting circuit of following structure, including reference signal production
Raw circuit, the reference signal generation circuit receives dim signal, and the reference signal generation circuit produces multiple negative with multichannel
Corresponding current reference signal is carried, described current reference signal characterizes the reference current of respective load, according to described electric 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 handled through operational amplifier, amplifier signal is obtained, it is described
Comparison circuit include with loading 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
It is connected with the control end of the on-off circuit.
Alternatively, described reference signal generation circuit includes reference generating circuit and benchmark distributor circuit, described base
Quasi- generation circuit, which is received, 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 reference signal of the sign total load current, and determines the allocation proportion of each road load current, with
Export corresponding current reference signal.
Alternatively, according to the light modulation speed of light modulator or switch motion, the ratio or lock of current each road load current are latched
A default load current ratio is deposited, does not change load current ratio when being dimmed after latch to light modulator and only changes total negative
Current-carrying size.
Alternatively, when recovering load current proportion adjustment, it regard the load current ratio latched as current load
Current ratio, and load current ratio is adjusted by light modulator on this basis.
Another technical solution of the present utility model is to provide a kind of LED drive circuit of following structure, including the above
Any one light adjusting circuit.
Using structure of the present utility model, compared with prior art, with advantages below：The utility model is adjusted in light modulator
On the basis of light, according to the dim signal, multiple current reference signals corresponding with multichannel loading are produced, are born with changing each road
Current-carrying ratio, so as to realize the regulation of colour temperature；Dim signal can be used to characterize dimmer switch switching or light modulation speed becomes
Change, latch the ratio of current each road load current or latch a default load current ratio.The utility model can directly lead to
Cross 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 present utility model.
Fig. 3 is to increase the schematic diagram of latch function on Fig. 2 light adjusting circuit；
Fig. 4 is the structural representation of the first embodiment of reference signal generation circuit of the present utility model；
Fig. 5 is the structural representation of another improved embodiment on the basis of Fig. 4；
Fig. 6 is the structural representation of second of embodiment of reference signal generation circuit of the present utility model；
Fig. 7 is the structural representation of the third embodiment of reference signal generation circuit of the present utility model.
Embodiment
Preferred embodiment of the present utility model is described in detail below in conjunction with accompanying drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in spirit and scope of the present utility model, modification, equivalent
Method and scheme.
Thoroughly understand in order that the public has to the utility model, in following the utility model preferred embodiment specifically
Understand concrete details, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to the drawings in the following passage.It should be noted that, accompanying drawing
Use using more simplified form and non-accurately ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
With reference to shown in Fig. 2, the structure of the LED drive circuit of the utility model application controllable silicon dimmer is illustrated.LED drives
Dynamic circuit includes controllable silicon dimmer TRIAC, rectifier bridge and power-switching circuit AC/DC, described controllable silicon dimmer TRIAC
Exchange input is received, is inputted after rectified bridge rectification to power-switching circuit AC/DC, power-switching circuit AC/DC output end
Connection load.For the convenience of elaboration, by taking the LED load of two-way as an example, i.e. LED1 and LED2 are two loads in parallel, respectively
It is photochromic for changes in temperature, by controllable silicon dimmer regulation power supply change-over circuit AC/DC output average current, light modulation just can be realized.
Reference current generating circuit VREFDim signal is received, described dim signal characterizes controllable silicon dimmer switch and cut
Change or angle of flow change, for example, light modulator, which is actually turned on angle or shut-off angle, total input current of load etc., can be used as tune
Optical signal.The reference signal generation circuit VREFProduce two and the corresponding current reference signal of two-way 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 opening in linear regulating circuit, Fig. 2 respectively
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 was 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 load LED1 and LED2 current ratio 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 that switch-mode regulation (i.e. PWM) is adjusted, described multichannel loading is in series with on-off circuit respectively, opens
Corresponding duty cycle signals, institute can be produced as easy on-off circuit according to described current reference signal by closing S1 and S2
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. the light adjusting circuit basis in Fig. 2
On add latch function, be applicable to various dimmer applications occasions, and the equal energy in linear regulating circuit and on-off circuit
It is applicable.According to the light modulation speed (for example, quick light modulation-Fast dimming) of light modulator or switch motion (ON/OFF), 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, does not then change load current ratio and only changes
The size of total load current.
In system cut-off for a period of time, the load current 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 utility model under the application scenario of switch-mode regulation is illustrated
A kind of structure of embodiment.Described reference signal generation circuit includes amplifier circuit and comparison circuit, and described adopts
The described dim signal of sample amplifying circuit sampling, is here adopted total input current of load as dim signal by resistance RS
Sample, and input operational amplifier U01 one end, resistance R01 and R02 series connection, the other end of its common port and operational amplifier U01
Connection, the resistance R01 other end is connected with sampling resistor RS one end, the resistance R02 other end and the operational amplifier U01
Output end connection.The output signal of the output end of the operational amplifier U01 is amplifier signal, is in the voltage on RS
Proportionate relationship, i.e., be exaggerated processing to the voltage on RS.The amplifier signal is to ramp signal respectively on corresponding road
The comparing unit of comparison circuit be compared.Comparator U03 receives institute as one of comparing unit, its in-phase input end
Ramp signal is stated, its inverting input receives the amplifier signal, comparator U03 outputs characterize load LED1 reference electricity
The duty cycle signals of stream, are connected through driver U05 with switching M01 control end；Comparator U04 as another comparing unit,
Its in-phase input end receives the amplifier signal, and its inverting input receives the ramp signal, comparator U04 output tables
The duty cycle signals of load LED2 reference current are levied, are connected through driver U06 with switching M02 control end.
With reference to shown in Fig. 5, another embodiment of reference signal generation circuit is illustrated, based on changing on the basis of Fig. 4
Enter.Current source I1 and current source I2 is added, described current source I1 connect with switch M01, and described current source I2 is with switching
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 utility model under the application scenario of linear regulation is illustrated
A kind of structure of embodiment.Described reference signal generation circuit includes reference generating circuit and benchmark distributor circuit, described
Reference generating circuit receive characterize it is each it is linear regulation circuit in adjust tubulose state signal, for example, LED negative terminal voltages and tune
Homogeneous tube is controlled in terminal voltage, the present embodiment, and M01 and M02 obtain characterizing total load current as the adjustment pipe of linear regulating circuit
Reference signal, avoid directly sampling total load current here using sampling resistor to obtain characterizing the benchmark letter of total load current
Number, 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.Moreover, root
According to the state of adjustment pipe, it can be determined that the pressure drop of adjustment pipe, so as to the distribution of corresponding regulation current ratio, make tune wherein all the way
Homogeneous tube pressure drop reaches minimum, the purpose of realization 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 inputs computing and put 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 make it 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 load LED2 linear regulating circuit, 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 utility model under the application scenario of linear regulation is illustrated
The structure of another embodiment, it realizes that circuit and method are similar to Fig. 6 substantially, and its reference product circuit, which is received, characterizes total bear
Current-carrying sampled signal, and add bias voltage Vos.Due to adding bias voltage Vos, completed in benchmark distributor circuit
After basis point is matched somebody with somebody, corresponding current reference signal is exported, bias voltage is superimposed in LED2 this current reference signal all the way
Vos, actually causes the load current sum of two-way to exceed the reference signal for characterizing total load current, road where load LED2
Switch M02 be likely to occur fully on situation so that switch M02 pressure drop reach minimum, the switch M01 and switch
M02 is the adjustment pipe of linear regulating circuit.
Although it is noted that operational amplifier U07 positive input terminal is only added in figure, according to circuit theory and reality
Border situation, can also be added in its negative input end, but voltage direction needs adjustment, and can be added in the positive and negative of operational amplifier U08
Input, you can be superimposed bias voltage on one or more.In addition, 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 be replaced and integrate between the embodiments, be related to one of embodiment and 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
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (10)
1. a kind of light adjusting circuit, including reference signal generation circuit, the reference signal generation circuit receive dim signal, described
Reference signal generation circuit produces multiple current reference signals corresponding with multichannel loading, and described current reference signal characterizes 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
It 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 processing, obtains amplifier signal, described comparison circuit is included with loading 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, which is received, characterizes adjustment tubulose state in each linear regulation circuit
Signal, obtains characterizing the reference signal of total load current, and described benchmark distributor circuit receives the sign total load current
Reference signal, and the allocation proportion of each road load current is determined, 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 receives the sampled signal for characterizing total load current, and generates table
The reference signal of total load current is levied, described benchmark distributor circuit receives the reference signal for characterizing total load current, and
The allocation proportion of each road load current is determined, 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 the adjustment pipe of wherein at least all the way in linear regulating circuit reaches minimum.
9. the light adjusting circuit according to claim 1 or 2 or 6, it is characterised in that：According to the light modulation speed or switch of light modulator
Action, latches the ratio of current each road load current or latches a default load current ratio, light modulator is entered after latch
The size that load current ratio only changes total load current is not changed during row light modulation.
10. a kind of LED drive circuit, it is characterised in that：Including any one light adjusting circuit of above claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621474583.2U CN206365087U (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621474583.2U CN206365087U (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206365087U true CN206365087U (en) | 2017-07-28 |
Family
ID=59377845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621474583.2U Withdrawn - After Issue CN206365087U (en) | 2016-12-30 | 2016-12-30 | Light adjusting circuit and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206365087U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793317A (en) * | 2016-12-30 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN110035575A (en) * | 2018-05-08 | 2019-07-19 | 杰华特微电子（杭州）有限公司 | A kind of control circuit of lighting circuit, control method and lighting circuit |
| CN113727496A (en) * | 2020-10-22 | 2021-11-30 | 杰华特微电子股份有限公司 | Multi-path LED driving method and driving circuit |
-
2016
- 2016-12-30 CN CN201621474583.2U patent/CN206365087U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793317A (en) * | 2016-12-30 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN106793317B (en) * | 2016-12-30 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN110035575A (en) * | 2018-05-08 | 2019-07-19 | 杰华特微电子（杭州）有限公司 | A kind of control circuit of lighting circuit, control method and lighting circuit |
| CN113727496A (en) * | 2020-10-22 | 2021-11-30 | 杰华特微电子股份有限公司 | Multi-path LED driving method and driving circuit |
| CN113727496B (en) * | 2020-10-22 | 2023-06-23 | 杰华特微电子股份有限公司 | Multi-path LED driving method and driving circuit |
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| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170728 Effective date of abandoning: 20181214 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170728 Effective date of abandoning: 20181214 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |