CN102159009A - White light LED (light-emitted diode)-line pulse dimming circuit and dimming method - Google Patents
White light LED (light-emitted diode)-line pulse dimming circuit and dimming method Download PDFInfo
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Abstract
The invention provides a white light LED (light-emitted diode)-pulse dimming circuit and a dimming method. The white light LED-line pulse dimming circuit comprises a power supply, a pulse control module, a current conversion module and a constant current source driving module, wherein the pulse control module is used for outputting a line pulse sequence; the current conversion module is respectively connected to the power supply and the pulse control module and is used for generating a standard current according to a voltage output by the power supply and generating a voltage which gradually reduces according to the increasing of line pulse by the utilizing of the standard current and the line pulse sequence; and the constant current source driving module is connected to the current conversion module and the white light LED and is used for outputting a driving current which has a fixed proportion relation with the voltage outputted by the current conversion module to the white light LED. The dimming circuit has the advantages that the dimming is realized simply, the working is stable and the precision is high.
Description
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Technical field
The present invention relates to the light regulating technology field of white light LEDs, particularly a kind of white light LEDs one line pulse light modulation circuit and light-dimming method thereof.
Background technology
White light LEDs (Light Emitting Diode, light-emitting diode) has a lot of incomparable advantages of other traditional lighting light source such as luminous efficiency height, low in energy consumption, life-span length, environmental protection.White light LEDs has been widely used in the back lighting of various portable electric appts display screens at present.
The wavelength of the light that white light LEDs sent is flow through the obvious effect of the electric current of LED, so constant for the light color that guarantees to send, the electric current that need flow through LED keeps constant.Therefore a major function of white light LEDs chip for driving is exactly for LED provides constant drive current output, simultaneously, in order to regulate the brightness of light, also needs to regulate the size of current that flows through LED.
Fig. 1 is that a typical case of white light chip for driving uses example.The negative electrode of four white light LEDs is received the drive current output pin of chip, and anode is received power supply.Chip internal makes the electric current that flows through white light LEDs still can keep constant when the forward conduction voltage of ambient temperature, supply voltage and LED changes in the constant current drives of generation on LED1 ~ LED4 pin.Simultaneously, chip is by the gating of EN end control entire chip, and the size of regulating output current, thereby regulates luminous brightness.
Wherein, can adopt periodicity to turn on and off drive current and regulate the light intensity that human eye is experienced, promptly regulate the light intensity that average current sent that human eye is experienced by the method for regulating the service time duty ratio.But this light-dimming method need be with higher frequency switching electric current, thereby can cause certain interference to power supply and other device, can audible noise if frequency also can produce people's ear in audiorange, if the not high enough light that sends that also can make of the frequency of switch produces the fluctuation that naked eyes are discovered.
Summary of the invention
The purpose of this invention is to provide a kind of white light LEDs one line pulse light modulation circuit, be easy to generate the fluctuation of noise and vision to solve existing white light LEDs light-dimming method, and the problem that can cause interference to power supply and other device.
Another object of the present invention is to propose a kind of white light LEDs one line pulse light modulation method, is easy to generate noise and vision fluctuation to solve existing white light LEDs light-dimming method, and the problem that can cause interference to power supply and other device.
The present invention proposes a kind of white light LEDs one line pulse light modulation circuit, comprises power supply, pulse control module, current conversion module and constant-current source driver module.Pulse control module is used to export one one line pulse train.Current conversion module links to each other with power supply and pulse control module respectively, is used for generating reference current according to the voltage of power supply output, and utilizes reference current and a line pulse train to generate the voltage that reduces step by step according to a line rising edge of a pulse number.The constant-current source driver module links to each other with current conversion module and white light LEDs respectively, is used for becoming with the voltage of current conversion module output to white light LEDs output the drive current of fixed proportion relation.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, current conversion module further comprises reference current generating circuit, current mirror, switching circuit, two-divider and voltage follower circuit again.Reference current generating circuit links to each other with power supply, is used to generate a reference current.Current mirror links to each other with reference current generating circuit, is used to utilize reference current to generate four road electric currents.Switching circuit links to each other with current mirror, is used for the on off operating mode of four road electric currents that the Control current mirror produced.Two-divider links to each other with pulse control module and switching circuit respectively, be used to utilize a line pulse train of pulse control module output to come the on off operating mode of control switch circuit, so that four road electric currents that current mirror produced all become the binary weights proportionate relationship with reference current.Voltage follower circuit links to each other with switching circuit, is used for converting the total current of four road electric currents to final voltage output.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, two-divider comprises four d type flip flops, four d type flip flops connect step by step, the clock signal terminal of the d type flip flop of the first order connects pulse control module, the inverse output terminal of the d type flip flop of first three grade links to each other with the data-signal input, the clock signal terminal that connects the next stage d type flip flop simultaneously, with triggering signal as next stage, the inverse output terminal of the d type flip flop of the fourth stage links to each other with the data-signal input, and the forward output of four d type flip flops links to each other with switching circuit, to control the on off operating mode of four road electric currents.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, reference current generating circuit comprises operational amplifier and reference resistance, and reference resistance links to each other with an output of operational amplifier.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, voltage follower circuit comprises operational amplifier and resistance, and resistance is connected between the output and input of operational amplifier.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, four road electric currents that current mirror produced are respectively 1 times, 2 times, 4 times, 8 times of reference current.
According to the described white light LEDs one line pulse light modulation circuit of preferred embodiment of the present invention, power supply is a bandgap voltage reference.
The present invention proposes a kind of white light LEDs one line pulse light modulation method in addition, may further comprise the steps: (1) generates reference current according to supply voltage.(2) utilize reference current and one one line pulse train to generate four road electric currents that become the binary weights proportionate relationship with reference current.(3) total current with four road electric currents converts the voltage that reduces step by step according to a line rising edge of a pulse number to.(4) drive current that becomes fixed proportion to concern with voltage to white light LEDs output.
According to the described white light LEDs one line pulse light modulation method of preferred embodiment of the present invention, it specifically is the logic output of adopting four d type flip flops that connect into the two-divider form, control four tunnel electric currents that become the binary weights proportionate relationship with reference current, and convert four road electric currents to voltage output.
According to the described white light LEDs one line pulse light modulation method of preferred embodiment of the present invention, four road electric currents are respectively 1 times, 2 times, 4 times, 8 times of reference current.
With respect to prior art, the invention has the beneficial effects as follows: it is simple that the present invention has realization, working stability, the advantage that accuracy is high, and circuit of the present invention does not need very high switching frequency, the generation of having avoided noise, vision to fluctuate effectively can not cause interference to other device simultaneously yet.
Description of drawings
Fig. 1 is a schematic diagram of existing white light chip for driving;
Fig. 2 is a kind of embodiment Organization Chart of white light LEDs one line pulse light modulation circuit of the present invention;
Fig. 3 is a kind of embodiment circuit diagram of current conversion module of the present invention;
Fig. 4 is the graph of a relation between the logic level state of the logic state of port b0 ~ b3 and CLK signal;
Fig. 5 is the drive current variations schematic diagram of white light LEDs of the present invention;
Fig. 6 is a kind of embodiment flow chart of white light LEDs one line pulse light modulation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.Between module wherein of the present invention and the circuit " connection " be direct or indirect electric connection.
See also Fig. 2, it is a kind of embodiment Organization Chart of white light LEDs one line pulse light modulation circuit of the present invention, and it comprises bandgap voltage reference 21, pulse control module 22, current conversion module 23 and constant-current source driver module 24.Crack reference voltage source 21 all links to each other with current conversion module 23 with pulse control module 22, and current conversion module 23 is connected to constant-current source driver module 24 after through an amplifying circuit, and constant-current source driver module 24 links to each other with four white light LEDs.
Wherein bandgap voltage reference 21 is a kind of comparatively mature technique, and it is not subjected to the influence of ambient temperature, output be the bandgap voltage reference of fixing.The output of pulse control module 22 is one one line pulse train, can be used for the voltage output of Control current modular converter 23.The input of current conversion module 23 is made up of bandgap voltage reference 21 and pulse control module 22, and it exports a voltage that reduces step by step according to a line rising edge of a pulse number.Constant-current source driver module 24 is exactly to be the functional module that four white light LEDs (LED1, LED2, LED3, LED4) provide constant-current source to drive, keeping certain proportionate relationship between the electric current of the drive current of output and inner setting, and its inner electric current to be output voltage by current conversion module 23 produce on a resistance.
Therefore, can change the drive current of constant-current source driver module 24 outputs by a line pulse train, and then can regulate the light intensity that each white light LEDs sends.Because light modulation scheme of the present invention does not need very high switching frequency, the generation of having avoided noise, vision to fluctuate effectively can not cause interference to other device simultaneously yet.
It should be noted that, current conversion module 23 is cores of the present invention, it has realized coming regulation voltage output by a line pulse train, thereby regulate the purpose of the drive current of final output, at this current conversion module 23 is elaborated, see also Fig. 3, it is for a kind of embodiment circuit diagram of current conversion module of the present invention.This current conversion module 23 comprises reference current generating circuit 31, current mirror 32, switching circuit 33, two-divider 34 and voltage follower circuit 35.
Reference current generating circuit 31 links to each other with bandgap voltage reference 21, and it comprises operational amplifier A 4 and reference resistance R1, is used to generate a reference current.Current mirror 32 links to each other with reference current generating circuit 31, four mirror-image channels that it includes and connects, and the electric current on four mirror-image channels is respectively 1 times, 2 times, 4 times, 8 times of reference current.Biasing circuit 36 links to each other with current mirror 32, and being used for provides the cascade biasing for current mirror 32.Switching circuit 33 is made of four switching tubes, is serially connected in respectively in four mirror-image channels of current mirror 32, is used for controlling opening and turn-offing of four road electric currents.Voltage follower circuit 35 links to each other with switching circuit 33, and it comprises operational amplifier A 5 and resistance R 2, is used for converting the total current of four road electric currents to final voltage output.
Two-divider 34 links to each other with pulse control module 22 and switching circuit 33 respectively, it comprises four d type flip flops of B0 ~ B3, four d type flip flops connect step by step, the clock signal terminal of the d type flip flop of the first order (d type flip flop B0) connects pulse control module 22, the d type flip flop of first three grade (d type flip flop B0, d type flip flop B1, d type flip flop B2) inverse output terminal links to each other with the data-signal input, the clock signal terminal that connects the next stage d type flip flop simultaneously, with triggering signal as next stage, the inverse output terminal of the d type flip flop of the fourth stage (d type flip flop B3) links to each other with the data-signal input, and the forward output b0 ~ b3 of four d type flip flops connects four switching tubes of switching circuit 33 respectively, to control the on off operating mode of four road electric currents, be opening and turn-offing of the corresponding 1 times of reference current of port b0, the opening and turn-offing of the corresponding 2 times of reference currents of port b1, and the like, port b2 controls 4 times of reference currents, port b3 controls 8 times of reference currents, and logic is high, current lead-through, logic is low, and electric current turn-offs.
The operation principle of this current conversion module 23 is:
At first the combination by operational amplifier A 4 and R1 generates a reference current, and its value is:
Iref=Vrefin/R1，
Wherein, Vrefin is the bandgap voltage reference of bandgap voltage reference 21 outputs.
By current mirror 32 respectively mirror image go out 1 times, 2 times, the electric current of 4 times and 8 times is designated as I0, I1, I2, I3 respectively.By four port b0, b1, b2, the logical bit of b3 is controlled opening and turn-offing of four road electric currents respectively.Relation between the logic state of each port b0 ~ b3 and the logic level state of CLK signal as shown in Figure 4, wherein the CLK signal is a line pulse train of pulse control module 22 output.
As can be seen from Figure 4, the relation between each rising edge of the variation of the logic state of each port b0 ~ b3 and CLK is come is as shown in table 1:
| After the CLK rising edge is come | b3 | b2 | b1 | b0 |
| The 1st | 0 | 0 | 0 | 1 |
| The 2nd | 0 | 0 | 1 | 0 |
| The 3rd | 0 | 0 | 1 | 1 |
| The 4th | 0 | 1 | 0 | 0 |
| The 5th | 0 | 1 | 0 | 1 |
| The 6th | 0 | 1 | 1 | 0 |
| The 7th | 0 | 1 | 1 | 1 |
| The 8th | 1 | 0 | 0 | 0 |
| The 9th | 1 | 0 | 0 | 1 |
| The 10th | 1 | 0 | 1 | 0 |
| The 11st | 1 | 0 | 1 | 1 |
| The 12nd | 1 | 1 | 0 | 0 |
| The 13rd | 1 | 1 | 0 | 1 |
| The 14th | 1 | 1 | 1 | 0 |
| The 15th | 1 | 1 | 1 | 1 |
| The 16th | 0 | 0 | 0 | 0 |
| The 17th | 0 | 0 | 0 | 1 |
Table 1
Can find, if the combination of the logic state of b0 ~ b3 converts 10 systems to, the counting of CLK rising edge of a pulse exactly.Because electric current that b0 ~ b3 controlled is consistent with weight proportion and its weight in binary system between the reference current, so the summation of four road electric currents and the proportionate relationship between the reference current counting of CLK rising edge of a pulse just.If the summation of four road electric currents is Io, the final output voltage of operational amplifier A 5 be Vo then:
Io＝I0?+?I1?+?I2?+?I3，
By being connected as can be known of operational amplifier A 5 and resistance R 2:
Vo＝Vrefin－Io*?R2
＝Vrefin－N*?Iref*?R2
＝Vrefin－N*?Vrefin/R1*?R2，
Wherein N is the counting of CLK rising edge of a pulse.If design makes R2=16*R1, so just have: Vo=Vrefin-N/16 * Vrefin, so after first CLK rising edge of a pulse arrives, Vo just becomes 15/16 * Vrefin, after second CLK rising edge of a pulse arrived, Vo just became 14/16 * Vrefin, and the like, the value of Vo reduces step by step, and the step-length of every grade of reduction is 1/16 * Vrefin.When CLK rising edge of a pulse number surpassed 15, Vo got back to Vrefin again, and then reduced step by step, as shown in Figure 5.Because the magnitude of voltage of Vo becomes the fixed proportion relation with final output driving current, so just realized having come the purpose of light modulation by the line pulse train of CLK like this.
White light LEDs one line pulse light modulation circuit of the present invention has realizes simply working stability, the advantage that accuracy is high.Corresponding to foregoing circuit, the invention allows for a kind of white light LEDs one line pulse light modulation method, as shown in Figure 6, it may further comprise the steps:
S601 generates reference current according to supply voltage.Power supply preferably adopts bandgap voltage reference.
S602 utilizes reference current and one one line pulse train to generate four road electric currents that become the binary weights proportionate relationship with reference current.
Preferable implementation is to adopt current mirror that the reference current mirror image is gone out four road electric currents, utilize the logic output of four d type flip flops that connect into the two-divider form then, control the on off operating mode of four road electric currents, thereby make and become the binary weights proportionate relationship between four road electric currents and the reference current.
S603 converts the total current of four road electric currents to reduce step by step according to a line rising edge of a pulse number voltage.
The preferred binary weights proportionate relationship of four road electric currents and reference current is 1 times, 2 times, 4 times, 8 times, thereby the summation of four road electric currents and the proportionate relationship between the reference current be the counting of a line rising edge of a pulse just, and, just the total current of four road electric currents can be converted to the voltage that reduces step by step according to a line rising edge of a pulse number in conjunction with the combination of discharge circuit and resistance.Concrete principle and computational process see also Fig. 3 ~ Fig. 5 and corresponding the description, are not giving unnecessary details at this.
S604 exports the drive current that becomes the fixed proportion relation with voltage to white light LEDs.
Because line rising edge of a pulse number is corresponding successively decreases step by step with one for drive current, therefore just can realize coming white light LEDs is carried out the purpose of light modulation by a line pulse train.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, only otherwise exceed the described scope of appended claims, all should drop in protection scope of the present invention.
Claims (10)
1. white light LEDs one a line pulse light modulation circuit is characterized in that, comprising:
One power supply;
One pulse control module is used to export one one line pulse train;
One current conversion module, link to each other with this power supply and this pulse control module respectively, be used for generating a reference current, and utilize this reference current and this line pulse train to generate a voltage that reduces step by step according to a line rising edge of a pulse number according to the voltage of this power supply output;
One constant-current source driver module links to each other with this current conversion module and white light LEDs respectively, is used for becoming with this voltage of this current conversion module output to white light LEDs output a drive current of fixed proportion relation.
2. white light LEDs one line pulse light modulation circuit as claimed in claim 1 is characterized in that this current conversion module further comprises again:
One reference current generating circuit links to each other with this power supply, is used to generate a reference current;
One current mirror links to each other with this reference current generating circuit, is used to utilize this reference current to generate four road electric currents;
One switching circuit links to each other with this current mirror, is used to control the on off operating mode of four road electric currents that this current mirror produces;
One two-divider, link to each other with this pulse control module and this switching circuit respectively, be used to utilize this line pulse train of this pulse control module output to control the on off operating mode of this switching circuit, so that four road electric currents that this current mirror produced all become the binary weights proportionate relationship with this reference current;
One voltage follower circuit links to each other with this switching circuit, is used for converting the total current of four road electric currents to final voltage output.
3. white light LEDs one line pulse light modulation circuit as claimed in claim 2, it is characterized in that, this two-divider comprises four d type flip flops, four d type flip flops connect step by step, the clock signal terminal of the d type flip flop of the first order connects this pulse control module, the inverse output terminal of the d type flip flop of first three grade links to each other with the data-signal input, the clock signal terminal that connects the next stage d type flip flop simultaneously, with triggering signal as next stage, the inverse output terminal of the d type flip flop of the fourth stage links to each other with the data-signal input, and the forward output of four d type flip flops links to each other with this switching circuit, to control the on off operating mode of four road electric currents.
4. white light LEDs one line pulse light modulation circuit as claimed in claim 2 is characterized in that this reference current generating circuit comprises an operational amplifier and a reference resistance, and this reference resistance links to each other with an input of this operational amplifier.
5. white light LEDs one line pulse light modulation circuit as claimed in claim 2 is characterized in that this voltage follower circuit comprises an operational amplifier and a resistance, and this resistance is connected between the output and input of this operational amplifier.
6. white light LEDs one line pulse light modulation circuit as claimed in claim 2 is characterized in that four road electric currents that this current mirror produced are respectively 1 times, 2 times, 4 times, 8 times of this reference current.
7. as each described white light LEDs one line pulse light modulation circuit of claim 1 ~ 6, it is characterized in that this power supply is a bandgap voltage reference.
8. white light LEDs one a line pulse light modulation method is characterized in that, may further comprise the steps:
Generate a reference current according to supply voltage;
Utilize this reference current and one one line pulse train to generate four road electric currents that become the binary weights proportionate relationship with this reference current;
Convert the total current of four road electric currents to reduce step by step a voltage according to a line rising edge of a pulse number;
Become a drive current of fixed proportion relation with this voltage to white light LEDs output.
9. white light LEDs one line pulse light modulation method as claimed in claim 8, it is characterized in that, it specifically is the logic output of adopting four d type flip flops that connect into the two-divider form, control four tunnel electric currents that become the binary weights proportionate relationship with this reference current, and with this voltage output that converts to of four road electric currents.
10. white light LEDs one line pulse light modulation method as claimed in claim 8 is characterized in that four road electric currents are respectively 1 times, 2 times, 4 times, 8 times of this reference current.
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| CN110049596A (en) * | 2019-04-28 | 2019-07-23 | 西安拓尔微电子有限责任公司 | A kind of pulse input detection circuit for white light LEDs light modulation |
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| CN101932159A (en) * | 2009-06-23 | 2010-12-29 | 启攀微电子（上海）有限公司 | Adaptive dimming control method for light emitting diode (LED) |
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| CN101932159A (en) * | 2009-06-23 | 2010-12-29 | 启攀微电子（上海）有限公司 | Adaptive dimming control method for light emitting diode (LED) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107550459A (en) * | 2017-08-11 | 2018-01-09 | 武汉大学 | A kind of optical coupling breast imaging analysis system and method |
| CN110049596A (en) * | 2019-04-28 | 2019-07-23 | 西安拓尔微电子有限责任公司 | A kind of pulse input detection circuit for white light LEDs light modulation |
| CN110049596B (en) * | 2019-04-28 | 2024-02-20 | 拓尔微电子股份有限公司 | Pulse input detection circuit for white light LED dimming |
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Date of cancellation: 20161209 Granted publication date: 20131106 Pledgee: Pudong Shanghai technology financing Company limited by guarantee Pledgor: Will Semiconductor Ltd. Registration number: 2015310000046 |
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Denomination of invention: White light LED (light-emitted diode)-line pulse dimming circuit and dimming method Effective date of registration: 20170317 Granted publication date: 20131106 Pledgee: Pudong Shanghai technology financing Company limited by guarantee Pledgor: Will Semiconductor Ltd. Registration number: 2017310000009 |
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