CN107664904B - Projection device, light source system and method for digitally controlling current of light source system - Google Patents

Projection device, light source system and method for digitally controlling current of light source system Download PDF

Info

Publication number
CN107664904B
CN107664904B CN201610613455.XA CN201610613455A CN107664904B CN 107664904 B CN107664904 B CN 107664904B CN 201610613455 A CN201610613455 A CN 201610613455A CN 107664904 B CN107664904 B CN 107664904B
Authority
CN
China
Prior art keywords
current
digital
light source
voltage
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610613455.XA
Other languages
Chinese (zh)
Other versions
CN107664904A (en
Inventor
黄国生
李屹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Appotronics Corp Ltd
Original Assignee
Appotronics Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Appotronics Corp Ltd filed Critical Appotronics Corp Ltd
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
Application granted granted Critical
Publication of CN107664904B publication Critical patent/CN107664904B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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]

Landscapes

  • 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 projection device, a light source system and a method for digitally controlling current thereof, wherein the method comprises the following steps: receiving digital current control information and converting the digital current control information into a voltage or current signal; and inputting the voltage or current signal into a power supply driving unit to control an input end of the power supply driving unit to finally control the constant output current. The digital transmission circuit for converting the digital signal into the analog signal is added, so that the transmission distance between the system control end and the power supply driving unit of the light source power supply is indirectly shortened, and transmission interference is avoided; in addition, a reference voltage is provided on the power driving unit, thereby further improving the accuracy of the constant output current.

Description

Projection device, light source system and method for digitally controlling current of light source system
Technical Field
The invention relates to the technical field of light source control, in particular to a projection device, a light source system and a method for digitally controlling current of the light source system.
Background
In the projector market today, mercury lamps are generally used as the illumination source because of their low cost and high brightness. With the rapid development of solid-state lighting, the options available for light sources of projectors, one of which is diversified. The light source as the light source of the projector is advantageous in that the energy consumption is low, but at the same time, the light source is expensive and the brightness is reduced, and is a soft rib of the light source, so that it is generally impossible to generate different colors by using laser diodes of different colors, and as the mainstream direction of the market, a laser diode of a pure color is generally used as the light source of the projector.
For the light source of a projector, color distortion may occur when the supply current is unstable. However, current control of the existing projectors is not very accurate, for example, a method of controlling a constant output current by using a pulse width modulation method, which substantially includes the following steps: the microcontroller generates a pulse width modulation signal, and the pulse width modulation signal is integrated into a voltage signal at the constant current driver end to control a set current pin or a feedback pin of the constant current driving chip to control the current. In addition, a system control terminal and a power supply driving power supply in the existing projector are two independent components, and a long-distance transmission line is generally adopted to connect the system control terminal and the power supply driving power supply, so that strong transmission interference is caused, and finally, a constant current is difficult to accurately control.
Disclosure of Invention
In view of this, embodiments of the present invention provide a projection apparatus, a light source system and a method for digitally controlling a current thereof, so as to precisely control a constant output current.
In a first aspect, an embodiment of the present invention provides a light source system, which includes:
a light source module for emitting source light;
a wavelength conversion device comprising at least one sub-region, the wavelength conversion device being periodically moved such that the at least one sub-region is located in the optical path of the source light;
and
and the control module is used for receiving the digital current control information and converting the digital current control information into a voltage or current signal so as to control the input end of the power supply driving unit to finally control the constant output current.
Preferably, the light source module includes a plurality of light sources, the plurality of light sources are divided into a plurality of groups of light sources, and the control module independently controls each group of light sources.
Preferably, the partitions are distributed on the wavelength conversion device in a ring shape or a block shape.
Preferably, at least one section is coated with a wavelength converting material.
Preferably, the control module receives digital current control information sent by a system control end, and the control module includes a current information conversion unit and a power supply driving unit, wherein:
the current information conversion unit is used for directly converting the digital current control information into a voltage or current signal; or converting the digital current control information into current digital information, converting the current digital information into a corresponding resistance value, and converting the current digital information into a voltage or current signal by adding a reference voltage;
and
and the power supply driving unit is used for receiving the voltage or current signal and controlling constant output current.
Preferably, the current information converting unit includes an MCU and a filter circuit, wherein:
when the MCU identifies the starting moment of the periodic motion of the wavelength conversion device, the system control end sends digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit and then outputs an analog voltage signal with different amplitudes.
Preferably, the power driving unit includes a transistor Q13, a current mirror chip U3, and a constant current control chip LM3421, wherein:
the analog voltage signals with different amplitudes control the conduction state of the triode Q13, and the constant current control pin CSH of the constant current control chip LM3421 is controlled by the current mirror chip U3 to control the constant output current of the constant current control chip LM 3421.
Preferably, the current information converting unit includes an MCU, a digital potentiometer ISL23418, and a voltage dividing resistor R276, wherein:
when the MCU identifies the starting time of the periodic movement of the wavelength conversion device, the system control end sends digital current control information to the MCU, the MCU selects the digital potentiometer ISL23418 through a chip, converts the digital current control information into current digital information through a communication mode, writes the current digital information into the digital potentiometer ISL23418, the digital potentiometer ISL23418 converts the current digital information into a corresponding resistance value according to the written value, and the resistance value and the voltage dividing resistor R276 generate a voltage dividing signal V _ C225 through an externally-added reference voltage VREF 1.
Preferably, the power driving unit includes a constant current controller, wherein the divided voltage signal V _ C225 is sent to a corresponding pin of the constant current controller, so as to control a constant output current value.
Preferably, the value of the current digital information is any one of values from 0 to 127, the corresponding resistance value is any one of resistance values from 0 to 50K ohms, wherein the resistance value corresponding to any one of values X from 0 to 127 is: X/127X 50K ohm.
In a second aspect, an embodiment of the present invention further provides a method for controlling current of a light source system, where the method includes:
converting the digital current control information into a voltage or current signal;
and inputting the voltage or current signal into a power supply driving unit to control an input end of the power supply driving unit to finally control the constant output current.
In a third aspect, an embodiment of the present invention further provides a projection apparatus, where the projection apparatus includes the light source system described in the embodiment of the present invention.
The projection device, the light source system control end and the method for controlling the current thereof provided by the embodiment of the invention can convert digital current control information into a voltage or current signal; and inputting the voltage or current signal into a power driving unit for controlling an input end of the power driving unit to finally control the constant output current. The digital transmission circuit for converting the digital signal into the analog signal is added, so that the transmission distance between the system control end and the power supply driving unit of the light source power supply is indirectly shortened, and transmission interference is avoided; in addition, the accuracy of the constant output current is further improved because a reference voltage is provided on the power driving unit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a light source system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a control module according to a second embodiment of the present invention.
Fig. 3 is a flowchart of a method for controlling current of a light source system according to a third embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a control current of a light source system according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a control current of a light source system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic diagram of a control end structure of a light source system according to an embodiment of the present invention, which includes a wavelength conversion device 10, a light source module 22, and a control module 20.
Wherein the light source module 22 is configured to emit source light. The light source module 22 may include a plurality of light sources, which may be laser diodes or other controllable brightness optics.
Preferably, the plurality of light sources may also be divided into several groups according to actual requirements, so as to implement independent control.
A wavelength conversion device 10, partially facing the optical path of the light source module 22, comprising at least one section, said wavelength conversion device 10 being periodically moved such that said at least one section is located in the optical path of said source light.
It will be appreciated that the portion of the wavelength conversion device facing the optical path of the light source module 22 is actually the optical path of the wavelength conversion device moving periodically so that the sub-area faces the optical path of the light source module 22. In fig. 1, the source light of the light source module 22 is directly projected onto the wavelength conversion device 10. In other embodiments, other optical elements may be added between the light source 22 and the wavelength conversion device 10.
Specifically, as shown in the figure, the wavelength conversion device 10 has a disk shape, and is divided into a red section 10a, a green section 10b, a blue section 10c, and a yellow section 10 d. Wherein each partition is annularly distributed on the wavelength conversion device 10. At least one of the sub-regions 10a-10d is coated with a wavelength conversion material for absorbing a portion of the excitation light of the sub-region and emitting excited light having a wavelength different from that of the excitation light, i.e., other color light different from the excitation light emitted from the light source module 22 can be generated by the wavelength conversion material of the sub-region. The wavelength converting material is preferably a phosphorescent material, such as a phosphor, a nanomaterial (e.g., quantum dots), or the like. This wavelength converting material may be coated on the surface of the substrate of the wavelength conversion device 10 or doped within the material of the substrate. The wavelength conversion device 10 is periodically rotated by a motor (not shown).
In other embodiments, the wavelength conversion device may also take on other shapes, for example, a strip or a barrel. The strip-shaped or barrel-shaped wavelength conversion device can be divided into a plurality of partitions according to actual requirements, and the plurality of partitioned partitions can be in a block shape or a strip shape. The wavelength conversion device can move up and down linearly and periodically under the drive of the motor so as to enable at least one subarea on the wavelength conversion device to be positioned on the light path of the source light.
The control module 20 is configured to receive the digital current control information and convert the digital current control information into a voltage or current signal, where the voltage or current signal is used to control an input terminal of the power driving unit to finally control the constant output current.
For convenience of explanation, how to precisely control the constant output current is described below with reference to fig. 4 and 5, respectively.
As shown in fig. 4, when the sensor in the control end of the light source system detects a pulse signal CW-INDEX, the pulse signal is transmitted to PIN 28 of an MCU (micro controller unit), the MCU identifies the start time of the wavelength conversion device after receiving the pulse signal, and at the same time, the system control end 21 (shown in fig. 2) sends digital current control information to the MCU, and after the digital current control information passes through the MCU, the digital current control information is processed by a filter circuit (composed of an inductor R65 and a capacitor C49) from PIN30, and then outputs an analog voltage signal I-LEVEL with different amplitudes. In other embodiments, the current control information may also output a current signal after being processed by the MCU and the filter circuit.
The analog voltage signals I-LEVEL with different amplitudes control the conduction state of the triode Q13, and control the constant current control pin CSH of the constant current control chip LM3421 through the current mirror chip U3, so as to control the constant output current of the constant current control chip LM3421, and thus control the driving current of the light source module.
In other embodiments, to make the circuit simpler, the analog voltage signals I-level with different amplitudes may also be directly input to the constant current control pin CSH of the constant current control chip LM 3421.
Meanwhile, a power supply reference voltage VREF2 is provided in the circuit, and in the embodiment, the voltage value of the VREF2 is preferably 4.2V, so that the constant output current can be controlled more accurately.
Further, in other embodiments, the MCU may be replaced by other manners, such as a digital-to-analog conversion DAC chip, a digital chip, or an analog circuit.
Since the digital signal is not interfered, in fig. 4, a digital transmission circuit for converting the digital signal into an analog signal, i.e., a control information conversion unit circuit including the MCU, is added, so that the transmission distance between the system control terminal 21 and the power driving unit 202 (shown in fig. 2) of the light source power supply is indirectly shortened, thereby avoiding transmission interference; in addition, a reference voltage VREF2 is provided on the power driver unit 202, thereby further improving the accuracy of the constant output current.
As shown in fig. 5, when the MCU (not shown in fig. 5) recognizes the start time of the periodic movement of the wavelength conversion device, the system control terminal sends digital current control information to the MCU, the MCU converts the digital current control information into current digital information by selecting 1 of the digital potentiometers ISL23418 on chip and through the SPI data line, and writes the current digital information into the digital potentiometer ISL23418, and the digital potentiometer ISL23418 converts the digital current control information into a resistance value of 0 to 50K ohms according to a certain value of the written values 0 to 127. For example, a value of 127 corresponds to 50K ohms, wherein any value X between 0 and 127 corresponds to a resistance value of: x/127 × 50K ohms, etc., the power reference voltage VREF1 is divided by the divider resistor R276 and the resistor to generate a divided voltage signal V _ C225, and the divided voltage signal V _ C225 is sent to a corresponding pin of the constant current controller to control the constant output current.
Preferably, the MCU may communicate by: SPI, RS232, or I2C, etc. converts electrical control information into current digital information. The digital potentiometer ISL23418 may also be replaced by other similarly functioning components.
Since the digital signal is not interfered, in fig. 5, a digital transmission circuit for converting the digital signal into an analog signal, i.e. a control information conversion unit including the MCU and the digital potentiometer ISL23418, is added, so that the transmission distance between the system control terminal 21 and the power driving unit 202 (shown in fig. 2) of the light source power supply is indirectly shortened, thereby avoiding transmission interference; in addition, since a reference voltage VREF1 is provided on the power driving unit 202, the accuracy of the constant output current is further improved.
The reference voltage VREF1 is preferably 2.5V.
The embodiment of the invention can receive the digital current control information and convert the digital current control information into a voltage or current signal, wherein the voltage or current signal is used for controlling the input end of the power supply driving unit to finally control the constant output current. The digital transmission circuit for converting the digital signal into the analog signal is added, so that the transmission distance between the system control end and the power supply driving unit of the light source power supply is indirectly shortened, and transmission interference is avoided; in addition, a reference voltage is provided on the power driving unit, thereby further improving the accuracy of the constant output current.
Example two
Fig. 2 is a schematic connection diagram of the control module and other components according to the second embodiment of the present invention. In fig. 2, the control module 20 is connected to the system control end 21 and the light source module 22 respectively.
The light source module 22 is electrically connected to the control module 20, and configured to generate corresponding source light according to the constant current output by the control module 20, and project the source light onto the wavelength conversion device to generate stimulated light.
The control module 20 receives the digital current control information sent by the system control end 21, and converts the digital current control information into a voltage or current signal to control the input end of the power driving unit to finally control the constant output current.
The control module 20 includes a current information converting unit 200 and a power driving unit 202, wherein:
the current information conversion unit 200 is configured to directly convert the digital current control information into a voltage or current signal; or converting the digital current control information into current digital information, converting the current digital information into a corresponding resistance value, and converting the current digital information into a voltage or current signal by adding a reference voltage; and
the power driving unit 202 is configured to receive the voltage or current signal and control a constant output current.
Specifically, in fig. 4, the current information converting unit 200 includes an MCU and a filter circuit, wherein:
when the MCU identifies the starting moment of the periodic motion of the wavelength conversion device, the system control end sends digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit and then outputs an analog voltage signal with different amplitudes.
The power driving unit 202 includes a transistor Q13, a current mirror chip U3, and a constant current control chip LM3421, wherein:
the analog voltage signals with different amplitudes control the conduction state of the triode Q13, and the constant current control pin CSH of the constant current control chip LM3421 is controlled by the current mirror chip U3 to control the constant output current of the constant current control chip LM 3421.
In fig. 5, the current information converting unit 200 includes an MCU, a digital potentiometer ISL23418, and a voltage dividing resistor R276, wherein:
when the MCU identifies the starting time of the periodic movement of the wavelength conversion device, the system control end sends digital current control information to the MCU, the MCU selects the digital potentiometer ISL23418 through a chip, converts the digital current control information into current digital information through a communication mode, writes the current digital information into the digital potentiometer ISL23418, the digital potentiometer ISL23418 converts the current digital information into a corresponding resistance value according to the written value, and the resistance value and the voltage dividing resistor R276 generate a voltage dividing signal V _ C225 through an externally-added reference voltage VREF 1.
The power driving unit 202 includes a constant current controller, wherein the divided voltage signal V _ C225 is sent to a corresponding pin of the constant current controller, so as to control a constant output current value.
EXAMPLE III
Fig. 3 is a flowchart of a method for controlling a current of a control terminal of a light source system according to a third embodiment of the present invention. The method comprises the following steps:
step S300, receiving the digital current control information, and converting the digital current control information into a voltage or current signal;
step S310, inputting the voltage or current signal into a power driving unit for controlling an input terminal of the power driving unit to finally control a constant output current.
Further, step S300 is to convert the digital current control information into a voltage or current signal by:
directly converting the digital current control information into a voltage or current signal; or
And converting the digital current control information into current digital information, converting the current digital information into a corresponding resistance value, and converting the resistance value into a voltage or current signal by adding a reference voltage.
Example four
The fourth embodiment of the present invention further provides a projection apparatus, where the projection apparatus includes the light source system in the embodiment of the present invention, and the method for controlling the current of the light source system in the embodiment of the present invention may be executed to accurately control the constant output current, so as to obtain light with more ideal brightness and saturation.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details not described in detail in this embodiment, reference may be made to the method provided in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (18)

1. A light source system, comprising:
a light source module for emitting source light;
a wavelength conversion device comprising at least one sub-region, the wavelength conversion device being periodically moved such that the at least one sub-region is located in the optical path of the source light;
and
the control module is used for receiving digital current control information and converting the digital current control information into a voltage or current signal so as to control the input end of the power supply driving unit to finally control the constant output current; the control module comprises a current information conversion unit and a power supply driving unit, wherein:
the current information conversion unit is used for directly converting the digital current control information into a voltage or current signal; or converting the digital current control information into current digital information, converting the current digital information into a corresponding resistance value, and converting the current digital information into a voltage or current signal by adding a reference voltage;
and
the power driving unit is used for receiving the voltage or current signal and controlling constant output current, wherein: the power supply driving unit comprises a triode Q13, a current mirror image chip U3 and a constant current control chip LM3421, wherein an analog voltage signal output by the current information conversion unit controls the conduction state of the triode Q13, and a constant current control pin CSH of the constant current control chip LM3421 is controlled through the current mirror image chip U3 so as to control the constant output current of the constant current control chip LM 3421.
2. The light source system of claim 1, wherein the light source module comprises a plurality of light sources, the plurality of light sources are divided into a plurality of groups of light sources, and the control module controls each group of light sources independently.
3. The light source system of claim 2, wherein the segments are distributed on the wavelength conversion device in a ring or block shape.
4. The light source system of claim 3, wherein at least one section is coated with a wavelength converting material.
5. The light source system according to claim 1, wherein the current information converting unit comprises an MCU and a filter circuit, wherein:
when the MCU identifies the starting moment of the periodic motion of the wavelength conversion device, the system control end sends digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit and then outputs an analog voltage signal with different amplitudes.
6. The light source system of claim 1, wherein the power driving unit further provides a reference voltage VREF2, and the reference voltage VREF2 is 4.2V.
7. The light source system of claim 1, wherein the current information converting unit comprises an MCU, a digital potentiometer ISL23418, and a voltage dividing resistor R276, wherein:
when the MCU identifies the starting time of the periodic movement of the wavelength conversion device, a system control end sends digital current control information to the MCU, the MCU selects the digital potentiometer ISL23418 through a chip, the digital current control information is converted into current digital information through a communication mode, the current digital information is written into the digital potentiometer ISL23418, the digital potentiometer ISL23418 is converted into a corresponding resistance value according to the written value, and the resistance value and a voltage dividing resistor R276 generate a voltage dividing signal V _ C225 through an externally-added reference voltage VREF 1.
8. The light source system of claim 7, wherein the power driving unit comprises a constant current controller, and wherein the divided voltage signal V _ C225 is applied to a corresponding pin of the constant current controller to control the constant output current value.
9. The light source system according to claim 7, wherein the current digital information has a value of any one of 0 to 127, and the corresponding resistance value has a value of any one of 0 to 50K ohms, and wherein any value X between 0 and 127 corresponds to a resistance value of: X/127X 50K ohm.
10. The light source system of claim 7, wherein the MCU communicates via any one of SPI, RS232 or I2C.
11. The light source system of claim 7, wherein the reference voltage VREF1 is 2.5V.
12. The light source system according to any of claims 5-11, wherein the MCU is replaced with any of a digital-to-analog conversion DAC chip, a digital chip or an analog circuit.
13. A projection device, characterized in that the projection device comprises a light source system according to any one of claims 1-12.
14. A method for digitally controlling current of a light source system, the method comprising the steps of:
receiving digital current control information, and converting the digital current control information into a voltage or current signal according to the motion state of a wavelength conversion device in the light source system, wherein the voltage or current signal is directly converted by the digital current control information to output an analog voltage signal with different amplitudes, or converting the digital current control information into current digital information, converting the current digital information into a corresponding resistance value, and converting the current digital information into a voltage or current signal by adding a reference voltage;
inputting the voltage or current signal into a power driving unit to control an input end of the power driving unit to finally control a constant output current; wherein the content of the first and second substances,
the power supply driving unit comprises a triode Q13, a current mirror chip U3 and a constant current control chip LM3421, wherein the analog voltage signals with different amplitudes control the conduction state of the triode Q13, and the constant current control pin CSH of the constant current control chip LM3421 is controlled through the current mirror chip U3 so as to control the constant output current of the constant current control chip LM 3421.
15. The method of digitally controlling current according to claim 14, further comprising the step of:
and outputting the constant current to a light source module so that the light source module emits stable source light.
16. The method of claim 15, wherein the light source module comprises a plurality of light sources, the plurality of light sources are divided into a plurality of groups of light sources, and the control module controls each group of light sources independently.
17. The method of claim 14, wherein the step of directly converting the digital current control information into a voltage or current signal is mainly performed by the MCU and the filter circuit to obtain the voltage or current signal, wherein:
when the MCU identifies the starting moment of the periodic motion of the wavelength conversion device, the system control end can output digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit and then outputs an analog voltage signal with different amplitudes.
18. The method of claim 14, wherein the step of converting the digital current control information into current digital information, converting the current digital information into corresponding resistance value, converting the current digital information into voltage or current signal by applying reference voltage, and obtaining the voltage or current signal by processing mainly by the MCU, the digital potentiometer ISL23418 and the voltage dividing resistor R276, wherein:
when the MCU identifies the starting time of the periodic movement of the wavelength conversion device, a system control end can send digital current control information to the MCU, the MCU selects the digital potentiometer ISL23418 through a chip, converts the digital current control information into current digital information through a communication mode, writes the current digital information into the digital potentiometer ISL23418, the digital potentiometer ISL23418 converts the current digital information into a corresponding resistance value according to the written value, and the resistance value and the voltage dividing resistor R276 generate a voltage dividing signal V _ C225 through an externally-added reference voltage VREF 1.
CN201610613455.XA 2016-07-29 2016-07-29 Projection device, light source system and method for digitally controlling current of light source system Active CN107664904B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201610613455.XA CN107664904B (en) 2016-07-29 2016-07-29 Projection device, light source system and method for digitally controlling current of light source system
PCT/CN2017/082491 WO2018018976A1 (en) 2016-07-29 2017-04-28 Projecting apparatus, light source system, and digital current control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610613455.XA CN107664904B (en) 2016-07-29 2016-07-29 Projection device, light source system and method for digitally controlling current of light source system

Publications (2)

Publication Number Publication Date
CN107664904A CN107664904A (en) 2018-02-06
CN107664904B true CN107664904B (en) 2021-07-06

Family

ID=61016830

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610613455.XA Active CN107664904B (en) 2016-07-29 2016-07-29 Projection device, light source system and method for digitally controlling current of light source system

Country Status (2)

Country Link
CN (1) CN107664904B (en)
WO (1) WO2018018976A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112114485B (en) * 2019-06-20 2023-05-09 青岛海信激光显示股份有限公司 Laser projection device
CN112654124B (en) * 2020-12-30 2024-01-05 广东奥普特科技股份有限公司 Light source controller with real-time synchronous trigger output or warning output and method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101426313A (en) * 2008-12-04 2009-05-06 上海广电光电子有限公司 Back light source driving method for LED
CN101808209B (en) * 2010-03-09 2012-08-15 四川维优科技有限责任公司 Method and circuit for dynamically modulating digital brightness of time sequence LCOS minisize projector
US8581519B2 (en) * 2011-08-25 2013-11-12 Hong Kong Applied Science & Technology Research Institute Co., Ltd. Current-switching LED driver using DAC to ramp bypass currents to accelerate switching speed and reduce ripple
US9467667B2 (en) * 2011-09-09 2016-10-11 Appotroincs Corporation Limited Method and apparatus of white balance adjustment
JP6201287B2 (en) * 2012-09-24 2017-09-27 セイコーエプソン株式会社 Display device and control method of display device
EP2993899A1 (en) * 2014-09-05 2016-03-09 Funai Electric Co., Ltd. Image projection apparatus

Also Published As

Publication number Publication date
WO2018018976A1 (en) 2018-02-01
CN107664904A (en) 2018-02-06

Similar Documents

Publication Publication Date Title
KR101578829B1 (en) Light source device, projection apparatus, and projection method
JP5056921B2 (en) Semiconductor light source device, semiconductor light source control method, and projection device
TWI446090B (en) Projection apparatus and projection method the same
KR100734465B1 (en) Illumination brightness and color control system and method therefor
CN101083860B (en) Drive device for light emitting diode element, light source device, and display
US20100072900A1 (en) System and method for generating light by color mixing
TW201137498A (en) Light source device, projecting device and projecting method
CN107664904B (en) Projection device, light source system and method for digitally controlling current of light source system
JP6503380B2 (en) Display control system and display device
JP2008185924A (en) Illuminating apparatus and image projector
CN103091953A (en) Light emitting module and display device
US20080290811A1 (en) Power source unit for discharge lamp and method of controlling the same
CN110703553B (en) Laser projection device
JP5510503B2 (en) Semiconductor device, semiconductor light source device, semiconductor device control method, and projection device
CN114815484A (en) Laser projection device
WO2021121300A1 (en) Current control circuit and method, and projection device
US9078302B2 (en) Apparatus for controlling an illumination device and method for controlling an illumination device
US20190296518A1 (en) Drive unit and light-emitting device
US20200166827A1 (en) Projection system and control method of driving current therefor
WO2018192470A1 (en) Multi-functional led dimming interface circuit
CN113709933B (en) LED lamp strip light-emitting control method and LED lamp strip controller
JP2017033645A (en) Light source device
CN220440951U (en) Intelligent LED indicator lamp
CN112241100B (en) Color correction method of lighting system and lighting system
CN210899751U (en) LED lamp control circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong.

Applicant after: APPOTRONICS Corp.,Ltd.

Address before: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong.

Applicant before: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd.

Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong.

Applicant after: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd.

Address before: 518055 Guangdong province Shenzhen Nanshan District Xili town Cha Guang road Shenzhen integrated circuit design application Industrial Park 401

Applicant before: APPOTRONICS Corp.,Ltd.

CB02 Change of applicant information
GR01 Patent grant
GR01 Patent grant