CN101827473A - Constant power drive control method for luminous element - Google Patents
Constant power drive control method for luminous element Download PDFInfo
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- CN101827473A CN101827473A CN200910126051A CN200910126051A CN101827473A CN 101827473 A CN101827473 A CN 101827473A CN 200910126051 A CN200910126051 A CN 200910126051A CN 200910126051 A CN200910126051 A CN 200910126051A CN 101827473 A CN101827473 A CN 101827473A
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Abstract
The invention discloses a constant power drive control method for a luminous element, which is used for stably driving the luminous element. The input power of the luminous element is measured by a power measuring apparatus, and a feedback controller of the luminous element controls the input power of the luminous element. Therefore, the input power of the luminous element can be stabilized; and the troubles (over-bright or insufficient illumination or damage) in application caused by the influence of ambient temperature change, unstable power supply or electrical characteristics change of the luminous element along with different production batches on the luminous element are eliminated.
Description
Technical field
The present invention relates to a kind of constant power drive control method of light-emitting component, particularly relate to a kind of method of Feedback of Power control of deciding of using with stabilized driving one light-emitting component, change with production batch is different with the electrical characteristic of eliminating because of ambient temperature change, power supply shakiness or light-emitting component, the influence of the input power of light-emitting component caused the puzzlement (it is bright or not enough that illumination is crossed, or damage) in the application.
Background technology
Volume is little, input power is few, the life-span is long, low cost and other advantages because light-emitting diode (LED) has, and the trend that replaces traditional light-emitting device is gradually not only arranged, and more produces many new application.
Light-emitting diode is made up of N type semiconductor and P type semiconductor, and is positioned at P-N interface (or node) between the two, and its resistance is quite responsive for ambient temperature, thereby the illumination size that causes light to export also can be subjected to the influence of ambient temperature.That is, when ambient temperature changes, can cause the light-emitting diode input power may be excessive and overheated, bright excessively, perhaps may be too small and the situation of illumination deficiency arranged.For example, when ambient temperature raise, the resistance at P-N interface descended, and caused the light-emitting diode operand power excessive and caloric value is big easily, and then shortened its useful life; When ambient temperature reduced, the resistance at P-N interface raise, and caused the light-emitting diode operand power too small and can't reach desired illumination easily.Moreover, for different model or the light-emitting diode produced at different time, its resistance value also has great variation because of the difference of material or technology, even cause to adopt and decide current drives, the output illumination of light-emitting diode is changed with production batch is different, cause the puzzlement (illumination is crossed bright or not enough) in the application.
This shows that the constant power drive control method of above-mentioned existing light-emitting component obviously still has inconvenience and defective, and demands urgently further being improved in method and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and conventional method does not have appropriate method to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of constant power drive control method of a kind of light-emitting component newly; in order to reduce the influence of ambient temperature to light-emitting diode; the protection light-emitting diode prolongs its life-span; more can stablize its output illumination; be not subjected to the influence of ambient temperature and element electrical characteristic difference; real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, overcome the defective of the constant power drive control method existence of existing light-emitting component, and a kind of constant power drive control method of new a kind of light-emitting component is provided, technical problem to be solved is to make it in order to reduce the influence of ambient temperature to light-emitting component (for example light-emitting diode) operation (input) power, also can reduce the influence to the light-emitting component operand power of unsettled input voltage, electric current.By this, not only can protect light-emitting component that its is prolonged in life-span, but the output illumination of stabilized illumination element more is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The constant power drive control method of a kind of light-emitting component that proposes according to the present invention comprises following steps: more than one light-emitting component; The power measurement device is in order to measure the input power of this light-emitting component; And feedback controller, the power signal that the received power measurer is measured, and export a control signal with power signal in view of the above.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The constant power drive control method of aforesaid a kind of light-emitting component, wherein above-mentioned light-emitting component are light-emitting diode.
The constant power drive control method of aforesaid a kind of light-emitting component, wherein above-mentioned power measurement device comprises: a current measurement device, in order to measure electric current by this light-emitting component; One voltage measurer is in order to measure the input voltage of this light-emitting component; And a multiplier, in order to this electric current is carried out multiplication mutually with this input voltage, to obtain this input power.
The constant power drive control method of aforesaid a kind of light-emitting component, it more comprises power supply unit (power supply), in order to provide DC power supply to give this light-emitting component, this power supply unit can receive the control signal of feedback controller output, and control signal changes power supply unit output thus, with the input power of stabilized illumination element.
The constant power drive control method of aforesaid a kind of light-emitting component, wherein said described feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; And a controller, its according to this difference to control the output of this power supply unit.
The constant power drive control method of aforesaid a kind of light-emitting component wherein comprises a power supply unit, gives this two light emitting in order to DC power supply to be provided.
The constant power drive control method of aforesaid a kind of light-emitting component, wherein above-mentioned feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; One controller, its according to this difference to produce a work period (duty cycle) control signal; And a switching device, the work period control signal that it is serially connected with the output of this light-emitting component and is controlled by this controller is in order to control the input power of this light-emitting component.
The constant power drive control method of aforesaid a kind of light-emitting component, wherein above-mentioned feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; One controller, its according to this difference to produce a work period (duty cycle) control signal; And a switching device, it is serially connected with between this DC power supply and this light-emitting component, and is controlled by this work period control signal, in order to control the input power of this light-emitting component.
The object of the invention to solve the technical problems also realizes by the following technical solutions.Decide power driving device according to a kind of light-emitting diode that the present invention proposes, comprise: an above light-emitting diode; Power supply unit is in order to provide the input of DC power supply to this above light-emitting diode respectively; The power measurement device is in order to measure the input power of this light-emitting diode respectively; And feedback controller, control the output of this power supply unit according to the input power value of setting, and then control the input power of light-emitting diode.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid light-emitting diode is decided power driving device, and wherein above-mentioned power measurement device comprises: a current measurement device, in order to measure electric current by this light-emitting diode; One voltage measurer is in order to measure the input voltage of this light-emitting diode; And a multiplier, in order to this output current is carried out multiplication mutually with this input voltage, to obtain the input power of this light-emitting diode.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; And a controller, its according to this difference to control the output of this power supply unit.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned preset reference power has complex values, can dynamically adjust, and makes light-emitting diode when special cases, also can adjust the size of its input power.
The object of the invention to solve the technical problems realizes in addition more by the following technical solutions.Decide power driving device according to a kind of light-emitting diode that the present invention proposes, comprise: an above light-emitting diode; One direct current power supply is in order to provide the input of DC power supply to this light-emitting diode; The power measurement device is in order to measure the input power of this above light-emitting diode respectively; And feedback controller, be connected to the output of this light-emitting diode respectively, this feedback controller according to this input power set point to control the input DC power of this light-emitting diode.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned power measurement device comprises: a current measurement device, in order to measure the output current of this light-emitting diode; One voltage measurer is in order to measure the input voltage of this light-emitting diode; And a multiplier, in order to this output current is carried out multiplication mutually with this input voltage, to obtain this input power.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; One controller, its according to this difference to produce a work period (duty cycle) control signal; And a switching device, it is serially connected with the output of this light-emitting diode and is controlled by this work period control signal, in order to control the luminous work period of this light-emitting component.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned preset reference power has complex values, can dynamically adjust, and makes light-emitting diode when special cases, also can adjust the size of its input power.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned switching device comprises a pulse-width modulation switch (PWM switch), and the one end is connected to this light-emitting diode, and the other end is ground connection then.
The object of the invention to solve the technical problems also realizes in addition by the following technical solutions.Decide power driving device according to a kind of light-emitting diode that the present invention proposes, comprise: more than one light-emitting diode; One direct current power supply is in order to provide DC power supply to this light-emitting diode; The power measurement device is in order to measure the input power of this light-emitting diode respectively; And feedback controller, be connected between this DC power supply and this light-emitting diode input, this feedback controller according to this input power to control the DC power supply that this light-emitting diode is imported.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned power measurement device comprises: a current measurement device, in order to measure electric current by this light-emitting diode; One voltage measurer is in order to measure the input voltage of this light-emitting diode; And a multiplier, in order to this electric current is carried out multiplication mutually with this input voltage, to obtain this input power.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned feedback controller comprises: a subtracter, in order to produce the difference of preset reference power and this input power; One controller, its according to this difference to produce a work period (duty cycle) control signal; And a switching device, it is serially connected with between the input of this DC power supply and this light-emitting diode, and is controlled by this work period control signal, which kind of work period to provide this DC power supply to give this light-emitting component in order to control this DC power supply with.
Aforesaid a kind of light-emitting diode is decided power driving device, and wherein above-mentioned switching device comprises a pulse-width modulation switch (PWM switch), and the one end is connected to this DC power supply, and the other end then is connected to this light-emitting diode.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, the constant power drive control method of a kind of light-emitting component of the present invention has following advantage and beneficial effect at least: the invention provides a kind of constant power drive control method of light-emitting component, in order to stabilized driving one solid-state light emitting element.Survey the input power of light-emitting component with the power measurement tolerance, but control the input power of the input power stabilized illumination element of this element again by the feedback controller of light-emitting component, eliminate the influence of variation of ambient temperature and element electrical characteristic difference input power.
In sum, the constant power drive control method of a kind of light-emitting component of the present invention is in order to stabilized driving one light-emitting component.Survey the input power of light-emitting component with the power measurement tolerance, control the input power of this element again by the feedback controller of light-emitting component, but the input power of stabilized illumination element, elimination changes with production batch is different because of the electrical characteristic of ambient temperature change, power supply shakiness or light-emitting component, to the influence of the input power of light-emitting component and cause puzzlement in the application (it is bright or not enough that illumination is crossed, or damage), the present invention has obvious improvement technically, having tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Figure 1A shows the electrical connection flow chart of constant power drive control method of the light-emitting component of one of embodiment of the invention.
Figure 1B shows the electrical connection flow chart of constant power drive control method of the light-emitting component of another embodiment of the present invention.
The electrical connection flow chart of the constant power drive control method of the light-emitting component of Fig. 2 A demonstration another embodiment of the present invention.
The electrical connection flow chart of the constant power drive control method of the light-emitting component of Fig. 2 B demonstration another embodiment of the present invention.
The part of the constant power drive control method of Fig. 3 A displayed map 2A light-emitting component particularly is used as switching device with pulse-width modulation switch (PWM switch).
The oscillogram of the relation of direct voltage (or power) and work period control signal among Fig. 3 B displayed map 3A.
100,102,200,202: the electrical connection flow chart of the constant power drive control method of light-emitting component
12: light-emitting diode 14: AC/DC converter
16: power measurement device 160: the current measurement device
162: voltage measurer 164: multiplier
18: feedback controller 180: subtracter
182: controller 19: feedback controller
190: subtracter 191: switch
192: controller
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, its embodiment of constant power drive control method, method, step, feature and the effect thereof of a kind of light-emitting component that foundation the present invention is proposed, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to present in the following detailed description that cooperates with reference to graphic preferred embodiment.By the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to get one more deeply and concrete understanding to the present invention, yet appended graphic only provide with reference to the usefulness of explanation, be not to be used for the present invention is limited.
Figure 1A shows the electrical connection flow chart of constant power drive control method 100 of a kind of light-emitting component of one of embodiment of the invention.In the present embodiment, light-emitting component is to use light-emitting diode (LightEmitting Diode:LED) 12.The illumination output of light-emitting diode 12 can be subjected to input direct voltage V
DCAnd the influence of ambient temperature Ta.The electrical connection flow chart of light-emitting diode 12 as shown in the figure, wherein, gain G
ViThe function that the electric current of representative by light-emitting diode influenced by input direct voltage, and gain G
AiThen representative is by the electric current function influenced by ambient temperature of light-emitting diode.
The input direct voltage V of light-emitting diode 12
DCBe to provide by 14 of AC/DC converters (AC/DCconverter or adapter).This AC/DC converter 14 is converted to DC power supply with alternating voltage Vac (for example household's supply socket provided civil power alternating voltage), and has a direct current voltage V
DC
The constant power drive control method 100 of a kind of light-emitting component of present embodiment comprises power measurement device (or detector) 16, is electrically connected to light-emitting diode 12 respectively, in order to the input power P of indivedual measurement light-emitting diodes 12.In the present embodiment, use current measurement device 160 to connect (serial connection) terminals, in order to detect the electric current I of light-emitting diode 12 to light-emitting diode 12; And, receive, detect direct voltage V with voltage measurer 162 connections (and connecing) terminals to light-emitting diode 12
DCThe direct voltage V that electric current I that current measurement device 160 is detected and voltage measurer 162 are detected
DC, input to multiplier 164 and carry out the input power value P that the phase multiplication can obtain light-emitting diode.The framework of the power measurement device 16 of present embodiment is the principle according to P=VxI.
In the present embodiment, it more comprises a subtracter 180 in order to a preset reference performance number P
SetSubtract each other with the power P that power measurement device 16 is detected; Resulting difference inputs to a controller 182, the direct voltage V that it is exported with control AC/DC converter 14 according to this difference again
DC, equal the preset reference power P up to the power P of light-emitting diode 12
SetFor example, when difference is negative value, then control AC/DC converter 14 to reduce its direct voltage V
DCOtherwise, when difference be on the occasion of the time, then control AC/DC converter 14 with its direct voltage V that raises
DC Controller 182 can be a circuit, also can be the controller (for example microprocessor) of software control.In other embodiments, can not use subtracter 180, but the performance number P that directly power measurement device 16 is detected is directly inputted into controller, its according to performance number P and directly (for example using lookup table mode) produce the corresponding AC/DC converter 14 that exports to.Aforementioned preset reference power P
SetThough be fixed value, also can be according to different application, do dynamically to set at different time by controller (or other elements), but adjust the input power size of light-emitting diode 12 according to the different application situation, to adjust output illumination.
Figure 1B shows electrical connection flow process Figure 102 of constant power drive control method of a kind of light-emitting component of one embodiment of the invention.It is identical with the employed element of Figure 1A embodiment, and uses same-sign to represent, for example, light-emitting diode 12 and power measurement device 16, therefore its content is omitted.The difference of present embodiment and Figure 1A is that the out-put supply of the AC/DC converter 14 of Figure 1A is a voltage, utilizes the performance number of controller feedback light emitting diode 12, and the output voltage V of control AC/DC converter 14
DC, reach the purpose of deciding power control, and the out-put supply of the AC/DC converter 14 of Figure 1B is an electric current, utilizes the performance number of controller feedback light emitting diode 12, and the output current I of control AC/DC converter 14
DC, reach the purpose of deciding power control.
Fig. 2 A shows the constant power drive control method 200 of a kind of light-emitting component of another embodiment of the present invention.It uses identical symbol with Figure 1A embodiment components identical, for example, light-emitting diode 12 and power measurement device 16, therefore its content is omitted.Present embodiment does not use AC/DC converter, but directly imports a direct current voltage V
DCYet, in other embodiments, also can use AC/DC converter to obtain direct voltage V
DCDirect voltage V in the present embodiment
DCValue can be also can fixing of floating; The former for example is the power supply that solar cell or storage battery provided, and the latter for example is the power supply of AC/DC converter or DC-DC converter output.In the present embodiment, more can directly utilize input one direct current electric current I
DCGive LED, replace direct voltage V
DCInput source.
The difference that present embodiment and Figure 1A embodiment are bigger is: the light-emitting diode 12 of last embodiment is to be subjected to continuous current drives, and the light-emitting diode 12 of present embodiment is the current drives that is subjected to suitching type (or switching regulator).In the present embodiment, light-emitting diode 12 its outputs are connected in series the switching device 191 to feedback controller 19; Because switching device 191 intermittent switch motions make light-emitting diode 12 also intermittent luminous.By the work period (dutycycle) of control switch device 191, controlled luminous (for not luminous) ratio of light-emitting diode 12, thereby can be controlled the input power P of light-emitting diode 12.(/ switch) frequency is higher than the perception degree that human eye vision persists because the switch of switching device 191, so human eye can not felt closing of light-emitting diode 12.Switching device 191 can use general metal-oxide half field effect transistor (MOSFET), pulse-width modulation (PWM) element or other to can be used as the electronic component of switch control.
The current measurement device 160 of present embodiment and voltage measurer 162 respectively comprise one with the switch DC electric current I and the direct voltage V that are detected
DCConversion of signals becomes to represent the signal processor of the continuous signal of mean value, inputs to multiplier 164 then respectively and carries out the Mean Input Power value P that the phase multiplication can obtain light-emitting diode.The power measurement device 16 average power P that obtains that measures feeds back to feedback controller 19 respectively.Its feedback controller 19 comprises a subtracter 190 in order to a preset reference power P
SetSubtract each other with the power P that power measurement device 16 is detected; Resulting difference inputs to a controller 192, its again according to this difference producing a work period (duty cycle) control signal D, luminous in order to control switch device 191 and light-emitting diode 12.By this, be maintained the input power of light-emitting diode 12, a kind of constant power drive control method 200 of light-emitting component thereby be maintained stable output illumination.
With last embodiment similarly be, controller 192 can be a circuit, also can be the controller (for example microprocessor) of software control; Also can not use subtracter 190, but the performance number P that directly power measurement device 16 is detected is directly inputted into controller, its according to performance number P and directly (for example using lookup table mode) produce the corresponding work period (duty cycle) and control signal to switching device 191.
The part of the constant power drive control method 200 of Fig. 3 A displayed map 2A light-emitting component particularly is used as switching device 191 with pulse-width modulation switch (Pulse Width Modulation switch, PWM switch).One end of pulse-width modulation switch 191 is connected to the output of light-emitting diode 12, and the other end is ground connection then.Direct voltage V among the oscillogram displayed map 3A of Fig. 3 B
DCThe relation of (or power P) and work period (duty cycle) control signal D.As shown in the figure, direct voltage V
DCFor what float, as direct voltage V
DCWhen (or power P) is too high (for example at time t1), the work period pulse bandwidth of control signal D is narrower, with so that the luminous ratio of light-emitting diode 12 conductings is shorter; As direct voltage V
DC(or power P) crosses (for example at time t2) when low, and the pulse bandwidth broad of work period control signal D is with so that the luminous ratio of light-emitting diode 12 conductings is longer.By this, even direct voltage V
DCOr electric current I
DCFor what float, the input power of light-emitting diode 12 still can be maintained at definite value.Moreover when ambient temperature reduction/rising caused the P-N interface resistance of light-emitting diode 12 to follow rising/reduction, feedback controller 19 was also controlled pulse-width modulation switch 191 with same principle, to keep the input power of light-emitting diode 12.This can protect the light-emitting diode 12 can overheated because of weather (ambient temperature rising) and burn, and also can avoid light-emitting diode 12 to cause the influence of output illumination deficiency because of weather cold excessively (ambient temperature reduction).
Fig. 2 B shows the constant power drive control method 202 of a kind of light-emitting component of another embodiment of the present invention.Present embodiment is identical with the employed composition important document of Fig. 2 A embodiment, yet control mode is slightly different; The connection of present embodiment is similar to Figure 1A embodiment.
Different with Fig. 2 A embodiment is that (for example pulse-width modulation switch (PWM switch) is to be serially connected with light-emitting diode 12 and direct voltage V to the switching device 191 in the present embodiment
DCBetween.As for 12 of light-emitting diodes is to be connected to power measurement device 16.Connect framework by this, feedback controller 19 will be according to preset reference performance number P
SetThe performance number P that is detected with power measurement device 16 controls direct voltage V
DCBe to supply with which kind of to give light-emitting diode 12 work period (duty cycle).
Embodiment by the invention described above, can reduce the influence of ambient temperature to light-emitting component (for example light-emitting diode) operation (/ input) power, can reduce the influence of unstable input voltage, electric current to the light-emitting component operand power, also can eliminate because of the electrical characteristic of light-emitting component with the different influences that change the input power of light-emitting component of production batch, and cause puzzlement in the application (it is bright or not enough that illumination is crossed, or damage).By this, not only can protect light-emitting component that its is prolonged in life-span, but the output illumination of stabilized illumination element more.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (21)
1. the constant power drive control method of a light-emitting component is characterized in that it comprises following steps:
More than one light-emitting component;
The power measurement device is in order to measure the input power of this light-emitting component; And
Feedback controller, the power signal that the received power measurer is measured, and export a control signal with power signal in view of the above.
2. the constant power drive control method of a kind of light-emitting component according to claim 1 is characterized in that wherein above-mentioned light-emitting component is a light-emitting diode.
3. the constant power drive control method of a kind of light-emitting component according to claim 1 is characterized in that wherein above-mentioned power measurement device comprises:
One current measurement device is in order to measure the electric current by this light-emitting component;
One voltage measurer is in order to measure the input voltage of this light-emitting component; And
One multiplier is in order to carry out multiplication mutually with this electric current with this input voltage, to obtain this input power.
4. the constant power drive control method of a kind of light-emitting component according to claim 1, it is characterized in that it more comprises power supply unit, in order to provide DC power supply to give this light-emitting component, this power supply unit can receive the control signal of feedback controller output, and control signal changes power supply unit output thus, with the input power of stabilized illumination element.
5. the constant power drive control method of a kind of light-emitting component according to claim 4 is characterized in that wherein said feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power; And
One controller, its according to this difference to control the output of this power supply unit.
6. the constant power drive control method of a kind of light-emitting component according to claim 1 is characterized in that it comprises a power supply unit, gives this two light emitting in order to DC power supply to be provided.
7. the constant power drive control method of a kind of light-emitting component according to claim 6 is characterized in that wherein above-mentioned feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power;
One controller, its according to this difference to produce a work period control signal; And
One switching device, the work period control signal that it is serially connected with the output of this light-emitting component and is controlled by this controller is in order to control the input power of this light-emitting component.
8. the constant power drive control method of a kind of light-emitting component according to claim 6 is characterized in that wherein above-mentioned feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power;
One controller, its according to this difference to produce a work period control signal; And
One switching device, it is serially connected with between this DC power supply and this light-emitting component, and is controlled by this work period control signal, in order to control the input power of this light-emitting component.
9. a light-emitting diode is decided power driving device, it is characterized in that it comprises:
An above light-emitting diode;
Power supply unit is in order to provide the input of DC power supply to this above light-emitting diode respectively;
The power measurement device is in order to measure the input power of this light-emitting diode respectively; And
Feedback controller is controlled the output of this power supply unit according to the input power value of setting, and then controls the input power of light-emitting diode.
10. a kind of light-emitting diode according to claim 9 is decided power driving device, it is characterized in that wherein above-mentioned power measurement device comprises:
One current measurement device is in order to measure the electric current by this light-emitting diode;
One voltage measurer is in order to measure the input voltage of this light-emitting diode; And
One multiplier is in order to carry out multiplication mutually with this output current with this input voltage, to obtain the input power of this light-emitting diode.
11. a kind of light-emitting diode according to claim 9 is decided power driving device, it is characterized in that wherein above-mentioned feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power; And
One controller, its according to this difference to control the output of this power supply unit.
12. a kind of light-emitting diode according to claim 11 is decided power driving device, it is characterized in that wherein above-mentioned preset reference power has complex values, can dynamically adjust, make light-emitting diode when special cases, also can adjust the size of its input power.
13. a light-emitting diode is decided power driving device, it is characterized in that it comprises:
An above light-emitting diode;
One direct current power supply is in order to provide the input of DC power supply to this light-emitting diode;
The power measurement device is in order to measure the input power of this above light-emitting diode respectively; And
Feedback controller is connected to the output of this light-emitting diode respectively, this feedback controller according to this input power set point to control the input DC power of this light-emitting diode.
14. a kind of light-emitting diode according to claim 13 is decided power driving device, it is characterized in that wherein above-mentioned power measurement device comprises:
One current measurement device is in order to measure the output current of this light-emitting diode;
One voltage measurer is in order to measure the input voltage of this light-emitting diode; And
One multiplier is in order to carry out multiplication mutually with this output current with this input voltage, to obtain this input power.
15. a kind of light-emitting diode according to claim 13 is decided power driving device, it is characterized in that wherein above-mentioned feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power;
One controller, its according to this difference to produce a work period control signal; And
One switching device, it is serially connected with the output of this light-emitting diode and is controlled by this work period control signal, in order to control the luminous work period of this light-emitting component.
16. a kind of light-emitting diode according to claim 15 is decided power driving device, it is characterized in that wherein above-mentioned preset reference power has complex values, can dynamically adjust, make light-emitting diode when special cases, also can adjust the size of its input power.
17. a kind of light-emitting diode according to claim 15 is decided power driving device, it is characterized in that wherein above-mentioned switching device comprises a pulse-width modulation switch, the one end is connected to this light-emitting diode, and the other end is ground connection then.
18. a light-emitting diode is decided power driving device, it is characterized in that it comprises:
More than one light-emitting diode;
One direct current power supply is in order to provide DC power supply to this light-emitting diode;
The power measurement device is in order to measure the input power of this light-emitting diode respectively; And
Feedback controller is connected between this DC power supply and this light-emitting diode input, this feedback controller according to this input power to control the DC power supply that this light-emitting diode is imported.
19. a kind of light-emitting diode according to claim 18 is decided power driving device, it is characterized in that wherein above-mentioned power measurement device comprises:
One current measurement device is in order to measure the electric current by this light-emitting diode;
One voltage measurer is in order to measure the input voltage of this light-emitting diode; And
One multiplier is in order to carry out multiplication mutually with this electric current with this input voltage, to obtain this input power.
20. a kind of light-emitting diode according to claim 18 is decided power driving device, it is characterized in that wherein above-mentioned feedback controller comprises:
One subtracter is in order to produce the difference of preset reference power and this input power;
One controller, its according to this difference to produce a work period control signal; And
One switching device, it is serially connected with between the input of this DC power supply and this light-emitting diode, and is controlled by this work period control signal, which kind of work period to provide this DC power supply to give this light-emitting component in order to control this DC power supply with.
21. a kind of light-emitting diode according to claim 20 is decided power driving device, it is characterized in that wherein above-mentioned switching device comprises a pulse-width modulation switch, the one end is connected to this DC power supply, and the other end then is connected to this light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910126051A CN101827473A (en) | 2009-03-03 | 2009-03-03 | Constant power drive control method for luminous element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910126051A CN101827473A (en) | 2009-03-03 | 2009-03-03 | Constant power drive control method for luminous element |
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| CN101827473A true CN101827473A (en) | 2010-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910126051A Pending CN101827473A (en) | 2009-03-03 | 2009-03-03 | Constant power drive control method for luminous element |
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| CN102419611A (en) * | 2010-09-28 | 2012-04-18 | 沛亨半导体股份有限公司 | Method for stabilizing power consumption of passive element |
| CN105527861A (en) * | 2014-09-28 | 2016-04-27 | 德玛凯股份有限公司 | Laser energy stable output control system and control method for cosmetic medical instrument |
| CN107690210A (en) * | 2016-08-03 | 2018-02-13 | 上海鸣志自动控制设备有限公司 | A kind of method for improving LED driver utilization rate |
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| US20080002103A1 (en) * | 2006-06-29 | 2008-01-03 | Sang Yun Lee | Liquid crystal display driving system having light emitting diodes |
| CN101500353A (en) * | 2008-01-29 | 2009-08-05 | 恒杰光电科技股份有限公司 | Lighting element color control apparatus and LED color control apparatus |
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| CN1745603A (en) * | 2002-12-19 | 2006-03-08 | 皇家飞利浦电子股份有限公司 | LESs driver |
| US20080002103A1 (en) * | 2006-06-29 | 2008-01-03 | Sang Yun Lee | Liquid crystal display driving system having light emitting diodes |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102419611A (en) * | 2010-09-28 | 2012-04-18 | 沛亨半导体股份有限公司 | Method for stabilizing power consumption of passive element |
| CN102419611B (en) * | 2010-09-28 | 2014-04-09 | 沛亨半导体股份有限公司 | Method for stabilizing power consumption of passive element |
| CN105527861A (en) * | 2014-09-28 | 2016-04-27 | 德玛凯股份有限公司 | Laser energy stable output control system and control method for cosmetic medical instrument |
| CN107690210A (en) * | 2016-08-03 | 2018-02-13 | 上海鸣志自动控制设备有限公司 | A kind of method for improving LED driver utilization rate |
| CN107690210B (en) * | 2016-08-03 | 2019-11-19 | 上海鸣志自动控制设备有限公司 | A method of improving LED driver utilization rate |
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Application publication date: 20100908 |