CN107664904A - The method of projection arrangement, light-source system and its digital control electric current - Google Patents

The method of projection arrangement, light-source system and its digital control electric current Download PDF

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Publication number
CN107664904A
CN107664904A CN201610613455.XA CN201610613455A CN107664904A CN 107664904 A CN107664904 A CN 107664904A CN 201610613455 A CN201610613455 A CN 201610613455A CN 107664904 A CN107664904 A CN 107664904A
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China
Prior art keywords
current
digital
light
control
voltage
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Granted
Application number
CN201610613455.XA
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Chinese (zh)
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CN107664904B (en
Inventor
黄国生
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN201610613455.XA priority Critical patent/CN107664904B/en
Priority to PCT/CN2017/082491 priority patent/WO2018018976A1/en
Publication of CN107664904A publication Critical patent/CN107664904A/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H05B45/397—Current mirror circuits
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The invention discloses a kind of method of projection arrangement, light-source system and its digital control electric current, the method comprising the steps of：Digital current control information is received, and digital current control information is converted into voltage or current signal；By the voltage or current signal input power driver element, to control the input of the power source drive unit finally to control constant output current.Due to adding the Digital Transmission circuit for converting digital signals into analog signal, therefore the transmission range of the power source drive unit of system control terminal and light source power is shortened indirectly, so as to avoid transmission interference；In addition, providing a reference voltage on power source drive unit, therefore further increase the precision of constant output current.

Description

The method of projection arrangement, light-source system and its digital control electric current
Technical field
The present invention relates to light source control technical field, more specifically to a kind of projection arrangement, light-source system and its number The method of word control electric current.
Background technology
In projector's in the market of today, typically using mercury lamp as lighting source because its have it is cheap with And the advantage of high brightness.With the fast development of solid-state illumination, the selection available for light source of projector tends to be diversified, and light source It is exactly a kind of selection therein.Light source is that energy consumption is low etc. as the light source advantage of projector, but at the same time, it is expensive and Luminance-reduction is then the weakness of light source, and therefore, the general laser diode being less likely in different colors produces different colors Coloured silk, as market mainstream direction, the laser diode of usually used pure color is used as the light source of projector.
For the light source of projector, when supply current is unstable, it is possible that color distortion.It is however, existing Projector current control all less precisely, for example, controlling the side of constant output current using pulse width modulation Formula, it generally comprises following steps：Pulse width modulating signal is produced by microcontroller, then electricity is integrated at constant-flow driver end The setting electric current pin or feedback pin of pressure signal and then control constant-current driven chip carry out control electric current.Generally, the voltage letter after integration Number it can be influenceed by high level voltage error, in addition, the system control terminal in existing projector and power drives power supply are two Individual independent part, generally all connected between them using the transmission line of relatively long distance, can also cause stronger transmission interference, Therefore it is difficult to be precisely controlled to eventually result in constant current.
The content of the invention
In view of this, a kind of method that the embodiment of the present invention provides projection arrangement, light-source system and its digital control electric current, Accurately to control constant output current.
In a first aspect, the embodiment of the present invention provides a kind of light-source system, it includes：
Light source module, for emission source light；
Wavelength converter, including at least one subregion, the Wavelength converter cycle movement so that it is described at least One subregion is located in the light path of the source light；
And
Control module, voltage is converted to for receiving digital current control information, and by the digital current control information Or current signal, to control the input of power source drive unit finally to control constant output current.
Preferably, the light source module includes multiple light sources, and the multiple light source divides multiple sets of light sources, the control module To every group of light source independent control.
Preferably, the subregion is in a ring or block distribution is on the Wavelength converter.
Preferably, at least one Zone coated has material for transformation of wave length.
Preferably, the digital current control information that the control module reception system control terminal is sent, the control module bag Current information converting unit and power source drive unit are included, wherein：
The current information converting unit, for the digital current control information to be converted directly into voltage or electric current letter Number；Or the digital current control information is converted into current digital information, and the current digital information is converted to accordingly Resistance value, voltage or current signal are changed into by additional reference voltage again；
And
The power source drive unit, for receiving the voltage or current signal, and control constant output current.
Preferably, the current information converting unit includes MCU and filter circuit, wherein：
When the MCU recognizes the initial time of the Wavelength converter cycle movement, system control terminal is sent Digital current control information gives the MCU, and the digital current control information is by the MCU with being exported after filter circuit processing The different analog voltage signal of one amplitude.
Preferably, the power source drive unit includes triode Q13, current mirror chip U3 and current constant control chip LM3421, wherein：
The different analog voltage signal of the amplitude controls the conducting state of the triode Q13, and passes through the electric current Mirror image chip U3 controls the current constant control pin CSH of the current constant control chip LM3421, to control current constant control chip LM3421 Constant output current.
Preferably, the current information converting unit includes MCU, digital regulation resistance ISL23418 and divider resistance R276, Wherein：
When the MCU recognizes the initial time of the Wavelength converter cycle movement, the system control terminal Send digital current control information and the digital regulation resistance ISL23418 is selected by piece to the MCU, the MCU, and by logical Digital current control information is converted to current digital information by letter mode, and the current digital information write-in numeral is electric Position device ISL23418, digital regulation resistance ISL23418 are converted to corresponding resistance value according to write-in value, and the resistance value is with dividing Piezoresistance R276 produces branch pressure voltage signal V_C225 by additional reference voltage V REF1.
Preferably, the power source drive unit includes constant-current controller, wherein the branch pressure voltage signal V_C225 is delivered to In the respective pins of constant-current controller, and then control constant output current value.
Preferably, the value of the current digital information be 0~127 in any value, it is described corresponding to resistance value be 0~ Any resistance value of 50K ohms, wherein resistance value corresponding to any value X between 0~127 is：X/127*50K ohms.
Second aspect, the embodiment of the present invention also provide a kind of method of light-source system control electric current, and the method comprising the steps of：
Digital current control information is converted into voltage or current signal；
By the voltage or current signal input power driver element, to control the input of the power source drive unit Finally control constant output current.
The third aspect, the embodiment of the present invention also provide a kind of projection arrangement, and the projection arrangement is included in the embodiment of the present invention Described light-source system.
The method of projection arrangement provided in an embodiment of the present invention, light-source system control terminal and its control electric current, can be by number Word current control information is converted to voltage or current signal；And by the voltage or current signal input power driver element, use To control the input of the power source drive unit finally to control constant output current.It is used for due to adding by data signal The Digital Transmission circuit of analog signal is converted to, therefore shortens the power source drive unit of system control terminal and light source power indirectly Transmission range, so as to avoid transmission interference；In addition, because providing a reference voltage on power source drive unit, to enter one Step improves the precision of constant output current.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention implementation Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to the accompanying drawing of offer Obtain other accompanying drawings.
Fig. 1 is the light-source system structural representation that the embodiment of the present invention one provides.
Fig. 2 is the control module structural representation that the embodiment of the present invention two provides.
Fig. 3 is the flow chart of the method for the light-source system control electric current that the embodiment of the present invention three provides.
Fig. 4 is the circuit theory diagrams for the light-source system control electric current that the embodiment of the present invention one provides.
Fig. 5 is the circuit theory diagrams for the light-source system control electric current that the embodiment of the present invention one provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
Embodiment one
As shown in figure 1, the light-source system control terminal structural representation provided for the embodiment of the present invention one, it includes wavelength and turned Changing device 10, light source module 22 and control module 20.
Wherein, the light source module 22, for emission source light.The light source module 22 may include multiple light sources, the light Source can be laser diode or the optics of other controllable brightness.
Preferably, light source can also be divided into several groups by the multiple light source according to actual demand, to realize independent control.
Wavelength converter 10, the light path of the part face light source module 22, it includes at least one subregion, the wavelength The cycle movement of conversion equipment 10 is so that at least one subregion is located in the light path of the source light.
It is understood that the Wavelength converter part face light path of light source module 22 is the wavelength convert in fact During device cycle movement, so that the light path of the subregion face light source module 22.In Fig. 1, the source light of the light source module 22 It is directly to be projected on the Wavelength converter 10.In other embodiments, can be filled in the light source 22 and wavelength convert Increase other optical elements between putting 10.
Specifically, as shown in FIG., 10 shape in disk form of Wavelength converter, the Wavelength converter is divided into Red subregion 10a, green partition 10b, blue partition 10c and yellow subregion 10d.Each of which subregion is distributed in described in a ring On Wavelength converter 10.At least one in the subregion 10a-10d is coated with material for transformation of wave length, for absorbing the subregion Part exciting light, and send wavelength different from exciting light wavelength stimulated light, can also pass through the wavelength convert material of subregion Expect to produce other coloured light of the exciting light sent different from light source module 22.The material for transformation of wave length is preferably phosphorescent material Expect, such as phosphor, nano material (such as quantum dot).This material for transformation of wave length can be coated on the substrate of Wavelength converter 10 Surface on, or be doped in the material of substrate.The Wavelength converter 10 is driven by motor (not shown) to carry out Periodic rotary.
In other embodiments, other shapes can also be presented in the Wavelength converter, for example, being in strip or drum Shape.The strip or barrel-shaped Wavelength converter can be divided into multiple subregions according to actual demand, multiple points of the division Area can be in block or strip.The Wavelength converter under the drive of motor can up and down linear period motion to allow ripple At least one subregion on long conversion equipment is located in the light path of source light.
Control module 20, for receiving digital current control information, and by digital current control information be converted to voltage or Current signal, the voltage or current signal are controlling the input of power source drive unit final to control constant output electric Stream.
For convenience of description, illustrate how accurately to control constant output current respectively below in conjunction with Fig. 4 and Fig. 5.
As shown in figure 4, when the inductor in light-source system control terminal detects pulse signal CW-INDEX, by the pulse Signal is reached on MCU (microcontroller unit, the micro-control unit) pin of PIN 28, and the MCU receives the pulse The initial time of Wavelength converter is identified after signal, at the same time, system control terminal 21 is (as shown in Figure 2) to give the MCU Digital current control information is sent, the digital current control information is after the MCU, by a filtering from PIN30 pin The different analog voltage signal I-LEVEL of an amplitude is exported after circuit (being made up of inductance R65 from electric capacity C49) processing.Other In embodiment, the current control information also exportable current signal after MCU and filter circuit processing.
The different analog voltage signal I-LEVEL control triodes Q13 of amplitude conducting state, and pass through current mirror As chip U3 control current constant control chips LM3421 current constant control pin CSH, thus control current constant control chip LM3421 perseverance Output current is determined, so as to control the driving current of light source module.
In other embodiments, can also be by the different analog voltage signal I-LIVEL of amplitude in order to make circuit simpler Directly input current constant control chip LM3421 current constant control pin CSH.
Meanwhile power reference voltage VREF2, in the present embodiment, the voltage of the VREF2 are additionally provided in the circuit Value is preferably 4.2V, therefore can more accurately control constant output current.
Further, in other embodiments, the MCU can also be substituted otherwise, for example, digital-to-analogue conversion DAC Chip, digit chip or analog circuit etc..
Because data signal is interference-free, in Fig. 4, add for converting digital signals into analog signal Digital Transmission circuit, i.e., the control information conversion unit circuit including MCU, therefore indirectly shorten system control terminal 21 with The transmission range of the power source drive unit 202 (as shown in Figure 2) of light source power, so as to avoid transmission interference；In addition, driven in power supply A reference voltage V REF2 is provided on moving cell 202, therefore further increases the precision of constant output current.
As shown in figure 5, when MCU recognizes the starting of the Wavelength converter cycle movement (not shown in Fig. 5) During quarter, system control terminal can send digital current control information and select wherein 1 digital regulation resistance by piece to the MCU, MCU ISL23418 and by SPI data wires, digital current control information is converted to current digital information, and by the current digital Information writes certain numerical value of the digital regulation resistance ISL23418, digital regulation resistance ISL23418 in write-in value 0~127, It is changed into certain resistance value of 0~50K ohms.Such as the corresponding 50K ohms of numerical value 127, wherein any value X between 0~127 is corresponding Resistance value be：X/127*50K ohms etc., power reference voltage VREF1 pass through divider resistance R276 and the electric resistance partial pressure, production Raw branch pressure voltage signal V_C225, the branch pressure voltage signal V_C225 is delivered in the respective pins of constant-current controller, and then is controlled Constant output current processed.
Preferably, the MCU can pass through following communication mode：SPI, RS232, or I2C etc. are converted to electric control information Current digital information.The digital regulation resistance ISL23418 can also be replaced with the element of other similar functions.
Because data signal is interference-free, in Figure 5, add for converting digital signals into analog signal Digital Transmission circuit, that is, include MCU and digital regulation resistance ISL23418 control information converting unit, therefore shorten indirectly and be Control terminal 21 of uniting and the transmission range of the power source drive unit 202 (as shown in Figure 2) of light source power, so as to avoid transmission interference； In addition, because providing a reference voltage V REF1 on power source drive unit 202, to further increase constant output current Precision.
The reference voltage V REF1 is preferably 2.5V.
The embodiment of the present invention can receive digital current control information, and by digital current control information be converted to voltage or Current signal, the voltage or current signal are controlling the input of power source drive unit final to control constant output electric Stream.Due to adding the Digital Transmission circuit for converting digital signals into analog signal, therefore shorten system control indirectly The transmission range of the power source drive unit of end processed and light source power, so as to avoid transmission interference；In addition, on power source drive unit A reference voltage is provided, therefore further increases the precision of constant output current.
Embodiment two
Fig. 2 is the connection diagram with other parts for the control module that the embodiment of the present invention two provides.In fig. 2, institute Control module 20 is stated respectively with system control terminal 21 and light source module 22 to be connected.
Light source module 22 is electrically connected with the control module 20, for the constant electricity exported according to the control module 20 The raw respective sources light of miscarriage, and stimulated luminescence will be produced in source light projection to Wavelength converter.
The control module 20 receives the digital current control information that the system control terminal 21 is sent, and by the numeral Current control information is converted to voltage or current signal, to control the input of power source drive unit finally to control constant output Electric current.
The control module 20 includes current information converting unit 200 and power source drive unit 202, wherein：
The current information converting unit 200, for the digital current control information to be converted directly into voltage or electricity Flow signal；Or the digital current control information is converted into current digital information, and the current digital information is converted to Respective resistivity values, voltage or current signal are changed into by additional reference voltage again；And
The power source drive unit 202, for receiving the voltage or current signal, and control constant output current.
Specifically, in Fig. 4, the current information converting unit 200 includes MCU and filter circuit, wherein：
When the MCU recognizes the initial time of the Wavelength converter cycle movement, system control terminal is sent Digital current control information gives the MCU, and the digital current control information is by the MCU with being exported after filter circuit processing The different analog voltage signal of one amplitude.
The power source drive unit 202 includes triode Q13, current mirror chip U3 and current constant control chip LM3421, Wherein：
The different analog voltage signal of the amplitude controls the conducting state of the triode Q13, and passes through the electric current Mirror image chip U3 controls the current constant control pin CSH of the current constant control chip LM3421, to control current constant control chip LM3421 Constant output current.
In Figure 5, the current information converting unit 200 includes MCU, digital regulation resistance ISL23418 and divider resistance R276, wherein：
When the MCU recognizes the initial time of the Wavelength converter cycle movement, the system control terminal Send digital current control information and the digital regulation resistance ISL23418 is selected by piece to the MCU, the MCU, and by logical Digital current control information is converted to current digital information by letter mode, and the current digital information write-in numeral is electric Position device ISL23418, digital regulation resistance ISL23418 are converted to corresponding resistance value according to write-in value, and the resistance value is with dividing Piezoresistance R276 produces branch pressure voltage signal V_C225 by additional reference voltage V REF1.
The power source drive unit 202 includes constant-current controller, wherein the branch pressure voltage signal V_C225 delivers to constant current In the respective pins of controller, and then control constant output current value.
Embodiment three
Fig. 3 is the flow chart of the method for the control electric current for the light-source system control terminal that the embodiment of the present invention three provides.The party Method includes step：
Step S300, digital current control information is received, and digital current control information is converted into voltage or electric current letter Number；
Step S310, by the voltage or current signal input power driver element, to control the power drives list The input of member finally controls constant output current.
Further, step S300 is to be accomplished by the following way digital current control information being converted to voltage or electric current Signal：
The digital current control information is converted directly into voltage or current signal；Or
The digital current control information is converted into current digital information, and the current digital information is converted into phase Resistance value is answered, voltage or current signal are changed into by additional reference voltage again.
Example IV
The embodiment of the present invention four also provides a kind of projection arrangement, and the projection arrangement is included described in the embodiment of the present invention Light-source system, can accurately it be controlled by the method for the control electric current for performing the light-source system in the embodiment of the present invention with realizing Constant output current, to obtain the light of more preferable brightness and saturation degree.
The said goods can perform the method that any embodiment of the present invention is provided, and possess the corresponding functional module of execution method And beneficial effect.Not ins and outs of detailed description in the present embodiment, reference can be made to the side that any embodiment of the present invention is provided Method.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes, Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.

Claims (21)

  1. A kind of 1. light-source system, it is characterised in that including：
    Light source module, for emission source light；
    Wavelength converter, including at least one subregion, the Wavelength converter cycle movement is so that described at least one Subregion is located in the light path of the source light；
    And
    Control module, voltage or electricity are converted to for receiving digital current control information, and by the digital current control information Signal is flowed, to control the input of power source drive unit finally to control constant output current.
  2. 2. light-source system according to claim 1, it is characterised in that the light source module includes multiple light sources, described more Individual light source divides multiple sets of light sources, and the control module is to every group of light source independent control.
  3. 3. light-source system according to claim 2, it is characterised in that the subregion is in a ring or block distribution is in the ripple On long conversion equipment.
  4. 4. light-source system according to claim 3, it is characterised in that at least one Zone coated has material for transformation of wave length.
  5. 5. light-source system according to claim 1, it is characterised in that what the control module reception system control terminal was sent Digital current control information, the control module include current information converting unit and power source drive unit, wherein：
    The current information converting unit, for the digital current control information to be converted directly into voltage or current signal； Or the digital current control information is converted into current digital information, and the current digital information is converted into corresponding resistor Value, is changed into voltage or current signal again by additional reference voltage；
    And
    The power source drive unit, for receiving the voltage or current signal, and control constant output current.
  6. 6. light-source system according to claim 5, it is characterised in that the current information converting unit includes MCU and filter Wave circuit, wherein：
    When the MCU recognizes the initial time of the Wavelength converter cycle movement, system control terminal sends numeral Current control information gives the MCU, and the digital current control information exports a width after the MCU and filter circuit processing Spend different analog voltage signals.
  7. 7. light-source system according to claim 6, it is characterised in that the power source drive unit includes triode Q13, electricity Traffic mirroring chip U3 and current constant control chip LM3421, wherein：
    The different analog voltage signal of the amplitude controls the conducting state of the triode Q13, and passes through the current mirror Chip U3 controls the current constant control pin CSH of the current constant control chip LM3421, to control current constant control chip LM3421 perseverance Determine output current.
  8. 8. light-source system according to claim 7, it is characterised in that the power source drive unit also provides a reference voltage VREF2, the reference voltage V REF2 are 4.2V.
  9. 9. light-source system according to claim 5, it is characterised in that the current information converting unit includes MCU, numeral Potentiometer ISL23418 and divider resistance R276, wherein：
    When the MCU recognizes the initial time of the Wavelength converter cycle movement, the system control terminal is sent Digital current control information gives the MCU, and the MCU selects the digital regulation resistance ISL23418 by piece, and passes through communication party Digital current control information is converted to current digital information by formula, and the current digital information is write into the digital regulation resistance ISL23418, digital regulation resistance ISL23418 are converted to corresponding resistance value, the resistance value and partial pressure electricity according to write-in value Hinder R276 and branch pressure voltage signal V_C225 is produced by additional reference voltage V REF1.
  10. 10. light-source system according to claim 9, it is characterised in that the power source drive unit includes constant-current controller, Wherein described branch pressure voltage signal V_C225 is delivered in the respective pins of constant-current controller, and then controls constant output current value.
  11. 11. light-source system according to claim 9, it is characterised in that during the value of the current digital information is 0~127 Any value, it is described corresponding to resistance value be 0~50K ohms any resistance value, wherein X pairs of any value between 0~127 The resistance value answered is：X/127*50K ohms.
  12. 12. light-source system according to claim 9, it is characterised in that the MCU passes through appointing in SPI, RS232 or I2C A kind of communication mode is communicated.
  13. 13. light-source system according to claim 9, it is characterised in that the reference voltage V REF1 is 2.5V.
  14. 14. according to the light-source system any one of claim 6-13, it is characterised in that the MCU can be turned with digital-to-analogue Any of DAC chip, digit chip or analog circuit are changed to replace.
  15. 15. a kind of projection arrangement, it is characterised in that the projection arrangement includes the light described in any one in claim 1-14 Source system.
  16. 16. the method for the digital control electric current of a kind of light-source system, it is characterised in that the method comprising the steps of：
    Digital current control information is received, and digital current control information is converted into voltage or current signal；
    By the voltage or current signal input power driver element, to control the input of the power source drive unit to come most Control constant output current eventually.
  17. 17. the method for digital control electric current according to claim 16, it is characterised in that be converted to current control information Voltage or current signal specifically include：
    The digital current control information is converted directly into voltage or current signal；Or
    The digital current control information is converted into current digital information, and the current digital information is converted into corresponding electricity Resistance, voltage or current signal are changed into by additional reference voltage again.
  18. 18. the method for digital control electric current according to claim 16, it is characterised in that also including step：
    The constant current is exported to light source module, so that the light source module sends stable source light.
  19. 19. the method for digital control electric current according to claim 18, it is characterised in that the light source module includes multiple Light source, the multiple light source divide multiple sets of light sources, and the control module is to every group of light source independent control.
  20. 20. the method for digital control electric current according to claim 17, it is characterised in that the step is electric by the numeral Flow control information is converted directly into voltage or current signal, mainly handled by MCU and filter circuit obtain voltage or Current signal, wherein：
    When the MCU recognizes the initial time of the Wavelength converter cycle movement, system control terminal can go out numeral Current control information gives the MCU, and the digital current control information is by the MCU with being exported after filter circuit processing The different analog voltage signal of one amplitude.
  21. 21. the method for digital control electric current according to claim 17, it is characterised in that the step is electric by the numeral Flow control information is converted to current digital information, and the current digital information is converted into respective resistivity values, passes through additional base Quasi- voltage is changed into voltage or current signal again, is mainly carried out by MCU, digital regulation resistance ISL23418 and divider resistance R276 Handle to obtain voltage or current signal, wherein：
    When the MCU recognizes the initial time of the Wavelength converter cycle movement, system control terminal can go out numeral Current control information gives the MCU, and the MCU selects the digital regulation resistance ISL23418 by piece, and passes through communication mode handle Digital current control information is converted to current digital information, and the current digital information is write into the digital regulation resistance ISL23418, the digital regulation resistance ISL23418 are converted to corresponding resistance value according to write-in value, the resistance value with it is described Divider resistance R276 produces branch pressure voltage signal V_C225 by additional reference voltage V REF1.
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