CN101990337B - Light source drive device capable of dynamically maintaining constant current drive and related method thereof - Google Patents
Light source drive device capable of dynamically maintaining constant current drive and related method thereof Download PDFInfo
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- CN101990337B CN101990337B CN200910161816.1A CN200910161816A CN101990337B CN 101990337 B CN101990337 B CN 101990337B CN 200910161816 A CN200910161816 A CN 200910161816A CN 101990337 B CN101990337 B CN 101990337B
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Abstract
The invention provides a light source driving device for driving a light-emitting element. The device comprises a voltage converter, a light-regulating unit, a current source and a control unit, wherein the voltage converter is coupled with the light-emitting element and is used for converting an input voltage to an output drive voltage according to a voltage control signal; the light-regulating unit is coupled with the light-emitting element and is used for executing a light-regulating program according to a light-regulating signal; the current source is coupled with the light-emitting unit and is used for providing drive current to drive the light-emitting element; and the control unit is coupled with the light-emitting unit and the voltage converter, is used for detecting a light-regulating state so as to generate a light-regulating detection signal and generating a reference voltage according to the light-regulating detection signal, and controls the voltage converter to generates the output drive voltage so as to drive the light-emitting element according to the reference voltage.
Description
Technical field
The present invention refers to a kind of light source drive device and correlation technique thereof, espespecially a kind of light source drive device and correlation technique thereof of determining current drives that maintain by detection of dynamic dimmer procedure.
Background technology
Along with the arriving of energy crisis and the new line of environmental consciousness, energy-conservation and demand environmental protection becomes the subject under discussion of global common concern now.The light source using compared to tradition, light-emitting diode (Light EmittingDiode, LED) due to have power saving, component life long, abundant without mercury, colour gamut, need not warm up the lamp time and the advantage such as reaction speed is fast, therefore, light-emitting diode has been widely used in showing and illuminating light source.In addition, due to little, lightweight, the resistance to collision of volume of light-emitting diode, be applicable to volume production, easily the characteristic such as fit applications demand can be made into the element of minimum or array, therefore light-emitting diode is except being applied to outdoor various display and traffic signal light, also can be applicable on various electronic product or portable product, such as the screen back light source of liquid crystal display, mobile phone, portable computer and personal digital assistant etc.
In the physical characteristic of light-emitting diode, by the electric current of light-emitting diode and the forward bias voltage drop of light-emitting diode, be exponential relationship, the luminous degree of light-emitting diode is directly proportional to the electric current by it, that is to say, when the electric current passing through is larger, the intensity of LED lighting is also higher.Therefore; in known technology; conventionally can use a pulse width modulation (Pulse width Modulation; PWM) light modulating device is adjusted the luminosity of light-emitting diode; it is mainly to utilize pulse width modulating signal to control current source to provide the average current to light-emitting diode, to realize dimmer procedure.In pulse width modulating signal, during in logic-high state, On current source provides current to light-emitting diode.Similarly, in pulse width modulating signal part, during in logic low state, stop current source and provide current to light-emitting diode.If the time of logic-high state is longer, the brightness of light-emitting diode is higher, and in like manner, vice versa.In other words, via the work period that changes this pulse width modulating signal, can control the luminosity of light-emitting diode.
Yet, while using aforesaid way to carry out dimmer procedure, because current source continues and carries out repeatedly conducting and close running, and drive the outputting drive voltage of light-emitting diode to take out greatly a year variation for being used for, outputting drive voltage can produce excessive chain ripple (ripple), thus, the head space voltage of current source (headroom voltage), that is in light-emitting diodes canal path, the spendable magnitude of voltage of current source, can be because the variation of outputting drive voltage be along with change.In the case, may there is too high or too low situation in head space voltage, and produce not good impact, and for instance, head space overtension, can increase the power consumption of current source, causes power supply conversion efficiency variation, and the life-span of current source is reduced; Otherwise head space brownout, will cause current source operation at unsuitable state, and cannot stable maintenance determine current drives light-emitting diode, even cannot provide required drive current and cause the situation that light-emitting diode cannot conducting.
Summary of the invention
Therefore, main purpose of the present invention is that providing a kind of capable of dynamic to maintain determines light source drive device and the correlation technique thereof of current drives.
The present invention discloses a kind of capable of dynamic and maintains the light source drive device of determining current drives, be used for driving a light-emitting component, include an electric pressure converter, be coupled to this light-emitting component, be used for, according to a voltage control signal, converting an input voltage to an outputting drive voltage; One light modulation unit, is coupled to this light-emitting component, is used for according to a dim signal, carries out a dimmer procedure; One current source, is coupled to this light modulation unit, is used to provide a drive current, to drive this light-emitting component; And a control unit, be coupled to this light modulation unit and this electric pressure converter, be used for detecting a dimming state, to produce a light modulation detection signal, and according to this light modulation detection signal, produce a reference voltage; Wherein, this control unit, according to this reference voltage, is controlled this electric pressure converter and is produced this outputting drive voltage, to drive this light-emitting component.
The present invention also discloses a kind of capable of dynamic and maintains the method for determining current drives, and for a light-emitting component, the method includes detection one dimming state, to produce a light modulation detection signal; According to this light modulation detection signal, produce a reference voltage; And according to this reference voltage, control an electric pressure converter and produce an outputting drive voltage, to drive this light-emitting component.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that embodiment of the present invention capable of dynamic maintains a light source drive device of determining current drives.
Fig. 2 is an embodiment schematic diagram of the reference voltage generator in Fig. 1.
Fig. 3 is an embodiment schematic diagram of the reference voltage generator in Fig. 1.
Fig. 4 is the schematic diagram of the embodiment of the present invention one flow process.
[main element label declaration]
10 light source drive device 102 light-emitting components
104 electric pressure converter 106 current sources
108 light modulation unit 110 control units
112 voltage selector 114 light modulation detectors
116 reference voltage generator 118 error amplifiers
120 switching controller 202,302 reference voltage generation units
204,306 multiplexer 304 voltage level shifters
40 flow processs
400,402,404,406,408 steps
C
1～C
mlED serial I
l1～I
lmload current
S
cvoltage control signal S
ddim signal
S
dSlight modulation detection signal V
doutputting drive voltage
V
hR1～V
hRmhead space voltage V
iNinput voltage
V
fBfeedback voltage V
rEFreference voltage
V
rEF_Ppreset reference voltage V
rEF_Dlight modulation reference voltage
Embodiment
Please refer to Fig. 1, Fig. 1 is the schematic diagram that embodiment of the present invention capable of dynamic maintains a light source drive device 10 of determining current drives.Light source drive device 10 is used for driving a light-emitting component 102.Light source drive device 10 includes an electric pressure converter 104, a current source 106, a light modulation unit 108 and a control unit 110.Wherein, light source drive device 10 is applicable to the light source of any kind.Be noted that in the present embodiment, light-emitting component 102 includes LED serial C
1～C
m, but not as limit, also can only have a LED serial.On the other hand, because light-emitting diode is a current driving element, its luminosity is directly proportional to drive current size.Generally speaking, for asking the identical requirement that reaches same brightness of electric current of each light-emitting diode of flowing through, therefore, in the present embodiment, each light-emitting diode group includes the light-emitting diode that n series system couples, but LED serial C
1～C
mthe light-emitting diode that is not confined to n serial connection, in other words, each LED serial also can only comprise single light-emitting diode.Electric pressure converter 104 is coupled to light-emitting component 102, is used for according to a voltage control signal S
c, by an input voltage V
iNconvert an outputting drive voltage V to
d, to provide to light-emitting component 102.Light modulation unit 108 is coupled to light-emitting component 102 and current source 106, is used for according to a dim signal S
d, carry out a dimmer procedure.Current source 106 is coupled to light modulation unit 108, is used to provide the load current I of each LED serial of flowing through
l1～I
lm, to drive light-emitting component 102.Control unit 110 is coupled to light modulation unit 108 and electric pressure converter 104, is used for detecting a dimming state D, to produce a light modulation detection signal S
dS, and according to light modulation detection signal S
dS, produce a reference voltage V
rEF.Then, control unit 110 is according to reference voltage V
rEF, control electric pressure converter 104 and produce an outputting drive voltage V
d, drive light-emitting component 102.Further, if light modulation detection signal S
dSdimmer procedure is carried out in indication, and control unit 110 can produce and be greater than a preset reference voltage V
rEF_Preference voltage V
rEF, wherein, preset reference voltage V
rEF_Pwhen not carrying out dimmer procedure, the desirable head space magnitude of voltage setting.If light modulation detection signal S
dSdimmer procedure is not carried out in indication, and control unit 110 can produce and be same as preset reference voltage V
rEF_Preference voltage V
rEF.
Preferably, light modulation unit 108 can be a pulse width modulation light modulation unit, and dim signal S
dit is a pulse width modulating signal.Thus, according to dim signal S
dlogic level state, light modulation unit 108 can be in dim signal S
dduring for high logic level, the relation that couples that conducting light-emitting component 102 and electric pressure converter are 104, makes load current I
l1～I
lmprovide to light-emitting component 102; In like manner, light modulation unit 108 can be in dim signal S
dduring for low logic level, close the relation that couples of 104 of light-emitting component 102 and electric pressure converters, make load current I
l1～I
lmstop providing to light-emitting component 102.In the case, can be by adjusting dim signal S
dwork period, carry out varying duty electric current I
l1～I
lmaverage current size.In other words,, by adjusting the work period of pulse width modulating signal, realize dimming function.
Further illustrate control unit 110, please continue to refer to Fig. 1.Control unit 110 includes a voltage selector 112, a light modulation detector 114, a reference voltage generator 116, an error amplifier 118 and a switching controller 120.Voltage selector 112 is coupled to light-emitting component 102, is used in corresponding to each LED serial C
1～C
mhead space voltage V
hR1～V
hRmin, select feedback voltage V
fB.Light modulation detector 114 is coupled to light modulation unit 108, is used for detecting dimming state D, to produce light modulation detection signal S
dS.Wherein, dimming state D comprises light modulation unit 108 and whether is just carrying out dimmer procedure or dim signal S
dinstruction content.In other words, light modulation detector 114 can direct-detection light modulation unit 108 function situation or dim signal S
dindication, produce light modulation detection signal S
dS.Reference voltage generator 116 is coupled to light modulation detector 114, is used for according to light modulation detection signal S
dS, produce reference voltage V
rEF.Further, a positive input terminal of error amplifier 118 and a negative input end are respectively coupled to voltage selector 112 and reference voltage generator 116, are used for according to reference voltage V
rEFand feedback voltage V
fB, produce an error voltage signal S
e.Switching controller 120 is coupled to 104 of an output of error amplifier 118 and electric pressure converters, is used for according to error voltage signal S
e, produce voltage control signal S
c, to provide to electric pressure converter 104.In the case, in feedback voltage V
fBbe greater than or less than reference voltage V
rEFtime, error amplifier 118 can, according to difference between the two, produce error voltage signal S
enotify switching controller 120, switching controller 120 produces voltage control signal S more according to this
c, to heighten or to reduce output voltage V
d.In brief, control unit 110 can detect whether carry out dimmer procedure in real time, and then dynamically adjust the reference voltage V of error originated from input amplifier 218
rEF, to reach in real time and effectively to complete feedback, follow the trail of to suitable output voltage V
d, thus, the present invention can avoid because of the head space undertension of current source that dimmer procedure causes 106 or too much problem, and can stable maintenance determine current driven light-emitting element, improve power supply conversion efficiency and the service time that extends light-emitting component.
On the other hand, reference voltage generator 116 is used for providing various magnitudes of voltage according to demand, therefore, can produce in any form required various magnitudes of voltage.For instance, as shown in reference to figure 2, reference voltage generator 116 includes a reference voltage generation unit 202 and a multiplexer 204.Reference voltage generation unit 202 is coupled to light modulation detector 114, is used for according to light modulation detection signal S
dS, produce a preset reference voltage V
rEF_Pan and light modulation reference voltage V
rEF_D.Multiplexer 204 is coupled to reference voltage generation unit 202, light modulation detector 114 and error amplifier 118, is used for according to light modulation detection signal S
dS, by preset reference voltage V
rEF_Pand light modulation reference voltage V
rEF_Dreference voltage V is selected in middle switching
rEF, to provide to error amplifier 118.In addition, as shown in Figure 3, reference voltage generator 116 also can include a reference voltage generation unit 302, a voltage level shifter 304 and a multiplexer 306.Reference voltage generation unit 302 is used for producing preset reference voltage V
rEF_P.Voltage level shifter 304 is coupled to light modulation detector 114 and reference voltage generation unit 302, is used for according to light modulation detection signal S
dS, by preset reference voltage V
rEF_P, be adjusted into light modulation reference voltage V
rEF_D.Multiplexer 306 is coupled to reference voltage generation unit 302, voltage level shifter 304, light modulation detector 114 and error amplifier 118, is used for according to light modulation detection signal S
dS, by preset reference voltage V
rEF_Pand light modulation reference voltage V
rEF_Dreference voltage V is selected in middle switching
rEF, to provide to error amplifier 118.It should be noted that reference voltage generator 116 can be according to light modulation detection signal S
dS, produce a suitable light modulation reference voltage V
rEF_D, with the outputting drive voltage variable quantity that may cause in dimmer procedure light modulation unit 108, compensate, for instance, for the light modulation unit 108 that uses pulse width modulation, light modulation reference voltage V
rEF_Dsize can be preset reference voltage V
rEF_Psummation with the amplitude amount of pulse width modulating signal.In the case, in light modulation detection signal S
dSbe designated as while carrying out dimmer procedure, multiplexer 204 is selected light modulation reference voltage V
rEF_Dfor reference voltage V
rEF; In light modulation detection signal S
dSbe designated as while not carrying out dimmer procedure, multiplexer 204 is selected preset reference voltage V
rEF_Pfor reference voltage V
rEF.
It should be noted that above-described embodiment is only for of the present invention one illustrates, those skilled in the art revise when making according to the actual requirements suitably.For instance, voltage selector 112 can be according to any rule in head space voltage V
hR1～V
hRmin select feedback voltage V
fB.For instance, voltage selector 112 can be from head space voltage V
hR1～V
hRmin, selecting minimum head space voltage is feedback voltage V
fB.
Therefore, the present invention can detect in real time and whether just carry out dimmer procedure, and then dynamically adjusts reference voltage V
rEF, to control the suitable outputting drive voltage V of electric pressure converter 104 output
d, thus, the present invention can avoid because of the head space undertension of current source that dimmer procedure causes 106 or too much problem, and can stable maintenance determine current driven light-emitting element, improve power supply conversion efficiency and the service time that extends light-emitting component.
Function mode about light source drive device 10, please refer to Fig. 4, and Fig. 4 is the schematic diagram of the embodiment of the present invention one flow process 40.Flow process 40 comprises the following step:
Step 400: start.
Step 402: detect dimming state D, to produce light modulation detection signal S
dS.
Step 404: according to light modulation detection signal S
dS, produce reference voltage V
rEF.
Step 406: according to reference voltage V
rEF, control electric pressure converter 104 and produce outputting drive voltage V
d, to drive light-emitting component 102.
Step 408: finish.
In sum, the present invention can detect in real time and whether just carry out dimmer procedure, and then dynamically adjusts reference voltage V
rEF, to control the suitable outputting drive voltage V of electric pressure converter 104 output
d, thus, the present invention can avoid because of the head space undertension of current source that dimmer procedure causes 106 or too much problem, and can stable maintenance determine current driven light-emitting element, improve power supply conversion efficiency and the service time that extends light-emitting component.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention scope change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. dynamically maintain a light source drive device of determining current drives, be used for driving a light-emitting component, include:
One electric pressure converter, is coupled to this light-emitting component, is used for, according to a voltage control signal, converting an input voltage to an outputting drive voltage;
One light modulation unit, is coupled to this light-emitting component, is used for according to a dim signal, carries out a dimmer procedure;
One current source, is coupled to this light modulation unit, is used to provide a drive current, to drive this light-emitting component; And
One control unit, is coupled to this light modulation unit and this electric pressure converter, is used for controlling this electric pressure converter and produces this outputting drive voltage, and to drive this light-emitting component, this control unit includes:
One voltage selector, is coupled to this light-emitting component, is used for, at least one the head space voltage corresponding to this light-emitting component, selecting a feedback voltage;
One light modulation detector, is coupled to this light modulation unit, is used for detecting a dimming state, to produce a light modulation detection signal;
One reference voltage generator, is coupled to this light modulation detector, is used for according to this light modulation detection signal, produces a reference voltage, and this reference voltage generator comprises:
One reference voltage generation unit, is coupled to this light modulation detector, is used for according to this light modulation detection signal, produces a preset reference voltage and a light modulation reference voltage; And
One multiplexer, is coupled to this reference voltage generation unit and this light modulation detector, is used for according to this light modulation detection signal, in this preset reference voltage and this light modulation reference voltage, switches and selects this reference voltage;
One error amplifier, is coupled to this voltage selector and this multiplexer, is used for according to this feedback voltage and this reference voltage, produces an error voltage signal; And
One switching controller, is coupled to this error amplifier and this electric pressure converter, is used for, according to this error voltage signal, producing this voltage control signal, to provide to electric pressure converter.
2. light source drive device according to claim 1, wherein this light-emitting component includes a plurality of LED serials.
3. light source drive device according to claim 2, wherein each LED serial in the plurality of LED serial comprises a plurality of light-emitting diodes that connect with series connection form.
4. light source drive device according to claim 1, wherein this light modulation unit is according to this dim signal, control conducting or close this light-emitting component and this current source light modulation between the relation that couples, to carry out this dimmer procedure.
5. light source drive device according to claim 1, wherein this voltage selector is in this at least one head space voltage, and selecting minimum head space voltage is this feedback voltage.
6. light source drive device according to claim 1, wherein this control unit, when this light modulation detection signal indication starts to carry out light modulation, produces this reference voltage that is greater than a preset reference voltage.
7. light source drive device according to claim 1, wherein this control unit, when this light modulation detection signal indication is not carried out light modulation, produces this reference voltage that is same as a preset reference voltage.
8. light source drive device according to claim 1, wherein this control unit detects this dim signal, to produce this light modulation detection signal.
9. dynamically maintain a light source drive device of determining current drives, be used for driving a light-emitting component, include:
One electric pressure converter, is coupled to this light-emitting component, is used for, according to a voltage control signal, converting an input voltage to an outputting drive voltage;
One light modulation unit, is coupled to this light-emitting component, is used for according to a dim signal, carries out a dimmer procedure;
One current source, is coupled to this light modulation unit, is used to provide a drive current, to drive this light-emitting component; And
One control unit, is coupled to this light modulation unit and this electric pressure converter, is used for controlling this electric pressure converter and produces this outputting drive voltage, and to drive this light-emitting component, this control unit includes:
One voltage selector, is coupled to this light-emitting component, is used for, at least one the head space voltage corresponding to this light-emitting component, selecting a feedback voltage;
One light modulation detector, is coupled to this light modulation unit, is used for detecting a dimming state, to produce a light modulation detection signal;
One reference voltage generator, is coupled to this light modulation detector, is used for according to this light modulation detection signal, produces a reference voltage, and this reference voltage generator comprises:
One reference voltage generation unit, is used for producing a preset reference voltage;
One voltage level shifter, is coupled to this light modulation detector and this reference voltage generation unit, is used for according to this light modulation detection signal, by this preset reference voltage, is adjusted into a light modulation reference voltage; And
One multiplexer, is coupled to this reference voltage generation unit, voltage level shifter and this light modulation detector, is used for according to this light modulation detection signal, in this preset reference voltage and this light modulation reference voltage, switches and selects this reference voltage;
One error amplifier, is coupled to this voltage selector and this multiplexer, is used for according to this feedback voltage and this reference voltage, produces an error voltage signal; And
One switching controller, is coupled to this error amplifier and this electric pressure converter, is used for, according to this error voltage signal, producing this voltage control signal, to provide to electric pressure converter.
10. dynamically maintain a method of determining current drives, for light-emitting component, the method includes:
Detect a dimming state, to produce a light modulation detection signal;
According to this light modulation detection signal, produce a preset reference voltage and a light modulation reference voltage, and switch and select a reference voltage in this preset reference voltage and this light modulation reference voltage;
From this light-emitting component, obtain a feedback voltage;
According to this feedback voltage and this reference voltage, produce a voltage control signal; And
According to this voltage control signal, produce an outputting drive voltage, to drive this light-emitting component.
11. methods according to claim 10, wherein this light-emitting component includes a plurality of LED serials.
12. methods according to claim 11, wherein each LED serial in the plurality of LED serial comprises a plurality of light-emitting diodes that connect with series connection form.
13. methods according to claim 10, wherein detect this dimming state, to produce the step of this light modulation detection signal, are to detect a dim signal, to produce this light modulation detection signal.
14. methods according to claim 10, wherein, when this light modulation detection signal indication starts to carry out light modulation, this reference voltage is greater than this preset reference voltage.
15. methods according to claim 10, wherein, when this light modulation detection signal indication is not carried out light modulation, this reference voltage is same as this preset reference voltage.
16. methods according to claim 10, wherein from this light-emitting component, obtain the step of this feedback voltage, are that selecting minimum head space voltage is this feedback voltage at least one the head space voltage corresponding to this light-emitting component.
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|---|---|---|---|
| CN200910161816.1A CN101990337B (en) | 2009-08-03 | 2009-08-03 | Light source drive device capable of dynamically maintaining constant current drive and related method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910161816.1A CN101990337B (en) | 2009-08-03 | 2009-08-03 | Light source drive device capable of dynamically maintaining constant current drive and related method thereof |
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| CN101990337B true CN101990337B (en) | 2014-03-26 |
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| CN104010404A (en) * | 2013-02-22 | 2014-08-27 | 普诚科技股份有限公司 | Light-emitting-diode drive unit |
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| CN103796373B (en) * | 2012-11-02 | 2016-05-11 | 安恩国际公司 | There is the control method of the LED illumination system of clamp device |
| TWI526113B (en) * | 2014-08-13 | 2016-03-11 | 緯創資通股份有限公司 | Light emitting diode driving chip, drving system appling the light emitting diode driving chip, and method thereof |
| CN106507540B (en) * | 2016-12-01 | 2018-05-15 | 意诺科技有限公司 | A kind of electric power system and a kind of method of supplying power to |
| WO2019098138A1 (en) * | 2017-11-14 | 2019-05-23 | 株式会社小糸製作所 | Vehicle lamp, illumination circuit for same, current driver circuit |
| CN110034734B (en) * | 2018-01-11 | 2023-04-07 | 晶豪科技股份有限公司 | Compensation circuit for compensating input bias of error amplifier |
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| CN101990337A (en) | 2011-03-23 |
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