WO2018018976A1 - 投影装置、光源系统及其数字控制电流的方法 - Google Patents

投影装置、光源系统及其数字控制电流的方法 Download PDF

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Publication number
WO2018018976A1
WO2018018976A1 PCT/CN2017/082491 CN2017082491W WO2018018976A1 WO 2018018976 A1 WO2018018976 A1 WO 2018018976A1 CN 2017082491 W CN2017082491 W CN 2017082491W WO 2018018976 A1 WO2018018976 A1 WO 2018018976A1
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Prior art keywords
current
digital
light source
voltage
mcu
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English (en)
French (fr)
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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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]

Definitions

  • the present invention relates to the field of light source control technology, and more particularly to a projection device, a light source system and a method of digitally controlling the current thereof.
  • mercury lamps are generally used as illumination sources because of their low price and high brightness.
  • the choice of projector light sources tends to be diversified, and the light source is one of them.
  • the advantage of the light source as the light source of the projector is that the energy consumption is low, but at the same time, the price is high and the brightness is reduced, which is the soft rib of the light source. Therefore, it is generally impossible to produce different colors with laser diodes of different colors, which is the mainstream of the market.
  • a solid color laser diode is usually used as the light source of the projector.
  • the current control of the existing projector is not very precise, for example, the method of controlling the constant output current by using pulse width modulation, which generally comprises the following steps: generating a pulse width modulation signal by the microcontroller, and then performing constant current
  • the driver terminal is integrated into a voltage signal to control the current pin or feedback pin of the constant current driving chip to control the current.
  • the integrated voltage signal is affected by the high-level voltage error.
  • the system control terminal and the power supply power supply in the existing projector are two separate components, and usually have a long distance between them.
  • the transmission line is connected, which also causes strong transmission interference, so eventually it will be difficult to accurately control the constant current.
  • embodiments of the present invention provide a projection apparatus, a light source system, and a method of digitally controlling the current thereof to accurately control a constant output current.
  • an embodiment of the present invention provides a light source system, including:
  • a light source module for emitting source light
  • a wavelength conversion device comprising at least one partition, the wavelength conversion device periodically moving to cause the at least one partition to be located on an optical path of the source light;
  • a control module configured to receive the digital current control information, and convert the digital current control information into a voltage or current signal to control an input end of the power driving unit to finally control the constant output current.
  • the light source module comprises a plurality of light sources, the plurality of light sources divide the plurality of sets of light sources, and the control module independently controls each set of light sources.
  • the partitions are distributed in a ring shape or a block shape on the wavelength conversion device.
  • At least one of the zones is coated with a wavelength converting material.
  • control module receives digital current control information sent by the control end of the system, and the control module includes a current information conversion unit and a power drive unit, wherein:
  • the current information conversion unit is configured to directly convert the digital current control information into a voltage or current signal; or convert the digital current control information into current digital information, and convert the current digital information into a corresponding resistance value , by converting the reference voltage to a voltage or current signal;
  • the power driving unit is configured to receive the voltage or current signal and control a constant output current.
  • the current information conversion unit comprises an MCU and a filter circuit, wherein:
  • the system control terminal sends digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit to output a Analog voltage signals of different amplitudes.
  • the power driving unit comprises a transistor Q13, a current mirror chip U3, and a constant current control chip LM3421, wherein:
  • the analog voltage signals of different amplitudes control the conduction state of the transistor 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 current control chip LM3421. Output current.
  • the current information conversion unit comprises an MCU, a digital potentiometer ISL23418, and a voltage dividing resistor R276, wherein:
  • the system control terminal sends digital current control information to the MCU, and the MCU passes the chip selects the digital potentiometer ISL23418 and passes The communication mode converts the digital current control information into current digital information, and writes the current digital information to the digital potentiometer ISL23418, and the digital potentiometer ISL23418 converts to a corresponding resistance value according to the written value, the resistance value and The voltage dividing resistor R276 generates a divided voltage signal V_C225 through the applied reference voltage VREF1.
  • the power driving unit comprises a constant current controller, wherein the divided voltage signal V_C225 is sent to a corresponding pin of the constant current controller, thereby controlling a constant output current value.
  • the value of the current digital information is any one of 0 to 127, and the corresponding resistance value is any resistance value of 0 to 50 K ohms, wherein the resistance corresponding to any value X between 0 and 127 Value is: X/127*50K ohms.
  • an embodiment of the present invention further provides a method for controlling current of a light source system, the method comprising the steps of:
  • the voltage or current signal is input to a power source driving unit for controlling an input end of the power source driving unit to finally control a constant output current.
  • an embodiment of the present invention further provides a projection apparatus including the light source system described in the embodiment of the present invention.
  • the projection device, the control terminal of the light source system and the method for controlling the current thereof can convert the digital current control information into a voltage or current signal; and input the voltage or current signal into the power driving unit for controlling the The input of the power drive unit is used to ultimately control the constant output current. Since the digital transmission circuit for converting the digital signal into the analog signal is added, the transmission distance between the control terminal and the power supply unit of the light source power supply is indirectly shortened, thereby avoiding transmission interference; in addition, since the power supply driving unit is provided A reference voltage to further increase the accuracy of the constant output current.
  • FIG. 1 is a schematic structural diagram of a light source system according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a control module according to Embodiment 2 of the present invention.
  • FIG. 3 is a flowchart of a method for controlling current of a light source system according to Embodiment 3 of the present invention.
  • FIG. 4 is a circuit schematic diagram of a control current of a light source system according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic circuit diagram of a control current of a light source system according to Embodiment 1 of the present invention.
  • FIG. 1 is a schematic structural diagram of a control end of a light source system according to Embodiment 1 of the present invention, which includes a wavelength conversion device 10, a light source module 22, and a control module 20.
  • the light source module 22 is configured to emit source light.
  • the light source module 22 can include a plurality of light sources, which can be laser diodes or other optics that control brightness.
  • the plurality of light sources may also divide the light sources into groups according to actual needs to achieve independent control.
  • the wavelength conversion device 10, partially in the optical path of the light source module 22, includes at least one partition, and the wavelength conversion device 10 is periodically moved such that the at least one partition is located on the optical path of the source light.
  • the wavelength conversion device portion is positively moving the light path of the light source module 22 when the wavelength conversion device is periodically moving, so that the partition is facing the light path of the light source module 22.
  • the source light of the light source module 22 is directly projected onto the wavelength conversion device 10.
  • other optical components may be added between the light source 22 and the wavelength conversion device 10.
  • the wavelength conversion device 10 has a disk shape, and the wavelength conversion device is divided into a red partition 10a, a green partition 10b, a blue partition 10c, and a yellow partition 10d. Each of the partitions is annularly distributed on the wavelength conversion device 10.
  • the partitions 10a-10d At least one of the coatings is coated with a wavelength converting material for absorbing a portion of the excitation light of the partition and emitting a laser having a wavelength different from the wavelength of the excitation light, that is, by differentiating the light source module 22 by the partitioned wavelength converting material. Other colored light that emits excitation light.
  • the wavelength converting material is preferably a phosphorescent material such as a phosphor or a nano material (such as quantum dots) Wait.
  • This wavelength converting material may be coated on the surface of the substrate of the wavelength conversion device 10 or doped into the material of the substrate.
  • the wavelength conversion device 10 is driven by a motor (not shown) to perform periodic rotation.
  • the wavelength conversion device may also take on other shapes, for example, in the form of a strip or a barrel.
  • the strip or barrel-shaped wavelength conversion device may divide a plurality of partitions according to actual needs, and the divided plurality of partitions may be in a block shape or a strip shape.
  • the wavelength conversion device can be linearly and periodically moved up and down by the motor to allow at least one partition on the wavelength conversion device to be located on the optical 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 for controlling the input end of the power driving unit to finally control the constant output current.
  • the pulse signal is transmitted to the MCU (microcontroller). Unit, micro control unit) PIN
  • the MCU recognizes the start time of the wavelength conversion device after receiving the pulse signal, and at the same time, the system control terminal 21 (shown in FIG. 2) sends digital current control information to the MCU, After passing through the MCU, the digital current control information is processed from a PIN30 pin through a filter circuit (composed of an inductor R65 and a capacitor C49) to output an analog voltage signal I-LEVEL having a different amplitude.
  • the current control information may also output a current signal after being processed by the MCU and the filter circuit.
  • the analog voltage signal I-LEVEL of different amplitudes controls the conduction state of the transistor Q13, and controls the constant current control pin CSH of the constant current control chip LM3421 through the current mirror chip U3, thereby controlling the constant output current of the constant current control chip LM3421. , thereby controlling the drive current of the light source module.
  • the analog voltage signal I-LIVEL having different amplitudes may be directly input to the constant current control pin CSH of the constant current control chip LM3421.
  • a power supply reference voltage VREF2 is also provided in the circuit.
  • the voltage value of the VREF2 is preferably 4.2V, so that the constant output current can be controlled more accurately.
  • the MCU may be replaced by other methods, such as a digital to analog conversion DAC chip, a digital chip or an analog circuit.
  • a digital transmission circuit for converting a digital signal into an analog signal that is, a control information conversion unit circuit including an MCU, is added, thereby indirectly shortening the system control terminal 21
  • the transmission distance from the power source driving unit 202 (shown in FIG. 2) of the light source power source avoids transmission interference; moreover, a reference voltage VREF2 is provided on the power source driving unit 202, thereby further improving the accuracy of the constant output current.
  • the system control terminal sends digital current control information to the MCU, and the MCU passes the chip selection.
  • One of the digital potentiometers ISL23418 converts the digital current control information into current digital information through the SPI data line, and writes the current digital information to the digital potentiometer ISL23418.
  • the digital potentiometer ISL23418 is based on the written value 0 ⁇ A value in 127 is converted to a resistance value of 0 to 50K ohms.
  • the value 127 corresponds to 50K ohms
  • the resistance value corresponding to any value X between 0 and 127 is: X/127*50K ohm, etc.
  • the power reference voltage VREF1 is divided by the voltage dividing resistor R276 to generate a partial pressure.
  • the voltage signal V_C225, the divided voltage signal V_C225 is sent to the corresponding pin of the constant current controller, thereby controlling the constant output current.
  • the MCU can convert the electrical control information into current digital information by using the following communication methods: SPI, RS232, or I2C.
  • the digital potentiometer ISL23418 can also be replaced by other similarly functional components.
  • a digital transmission circuit for converting a digital signal into an analog signal that is, a control information conversion unit including an MCU and a digital potentiometer ISL23418, is added, thereby indirectly shortening the system control.
  • the reference voltage VREF1 is preferably 2.5V.
  • Embodiments of the present invention can receive digital current control information and convert the digital current control information into a voltage or current signal that is used to control the input of the power supply unit to ultimately control the constant output current. Since the digital transmission circuit for converting the digital signal into the analog signal is added, the transmission distance between the control terminal and the power supply unit of the light source power supply is indirectly shortened, thereby avoiding transmission interference; in addition, a power supply unit is provided on the power supply unit. The reference voltage further increases the accuracy of the constant output current.
  • FIG. 2 is a schematic diagram of connection of a control module with other components according to Embodiment 2 of the present invention.
  • the control module 20 is connected to the system control terminal 21 and the light source module 22, respectively.
  • the light source module 22 is electrically connected to the control module 20 for generating a corresponding source light according to a constant current output by the control module 20, and projecting the source light onto the wavelength conversion device to generate the excited light.
  • the control module 20 receives the digital current control information sent by the system control terminal 21 and converts the digital current control information into a voltage or current signal to control the input end of the power supply driving unit to finally control the constant output current.
  • the control module 20 includes a current information conversion unit 200 and a power supply 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 convert the digital current control information into current digital information, and convert the current digital information into a corresponding resistance Value, converted to a voltage or current signal by applying a reference voltage; and
  • the power driving unit 202 is configured to receive the voltage or current signal and control a constant output current.
  • the current information conversion unit 200 includes an MCU and a filter circuit, wherein:
  • the system control terminal sends digital current control information to the MCU, and the digital current control information is processed by the MCU and the filter circuit to output a Analog voltage signals of 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 of different amplitudes control the conduction state of the transistor 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 current control chip LM3421. Output current.
  • the current information conversion unit 200 includes an MCU, a digital potentiometer ISL23418, and a voltage dividing resistor R276, wherein:
  • the system control terminal sends digital current control information to the MCU, and the MCU passes the chip selects the digital potentiometer ISL23418 and passes The communication mode converts the digital current control information into current digital information, and writes the current digital information to the digital potentiometer ISL23418, and the digital potentiometer ISL23418 converts to a corresponding resistance value according to the written value, the resistance value and The voltage dividing resistor R276 generates a divided voltage signal V_C225 through the applied reference voltage VREF1.
  • 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 to control a constant output current value.
  • FIG. 3 is a flowchart of a method for controlling current at a control end of a light source system according to Embodiment 3 of the present invention. The method includes the steps of:
  • Step S300 receiving digital current control information, and converting the digital current control information into a voltage or current signal
  • Step S310 the voltage or current signal is input to the power driving unit for controlling the input end of the power driving unit to finally control the constant output current.
  • step S300 is to convert the digital current control information into a voltage or current signal by:
  • the fourth embodiment of the present invention further provides a projection apparatus, which includes the light source system described in the embodiment of the present invention, and can implement a precise control method by performing a method of controlling current of the light source system in the embodiment of the present invention. Output current for better light and saturation.
  • the above product can perform the method provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

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  • Engineering & Computer Science (AREA)
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Abstract

一种投影装置、光源系统及其数字控制电流的方法，该方法包括：接收数字电流控制信息，并将数字电流控制信息转换为电压或电流信号(S300)；将电压或电流信号输入电源驱动单元(202)，用以控制电源驱动单元(202)的输入端来最终控制恒定输出电流(S310)。由于增加了用于将数字信号转换为模拟信号的数字传输电路，因此间接缩短了系统控制端(21)与光源电源的电源驱动单元(202)的传输距离，从而避免传输干扰；此外，在电源驱动单元(202)上提供了一基准电压，进一步提高了恒定输出电流的精准度。

Description

投影装置、光源系统及其数字控制电流的方法 技术领域
本发明涉及光源控制技术领域，更具体地说，涉及一种投影装置、光源系统及其数字控制电流的方法。
 背景技术
在如今的投影机市场上，一般都是以汞灯作为照明光源，因为其有着价格低廉以及高亮度的优势。随着固态照明的快速发展，可用于投影机光源的选择趋于多样化，而光源就是其中的一种选择。光源作为投影机的光源优势在于能耗低等，但与此同时，价格昂贵且亮度降低则是光源的软肋，因此，一般不太可能以不同颜色的激光二极管来产生不同的色彩，作为市场主流方向，通常使用纯色的激光二极管来作为投影机的光源。
 技术问题
对于投影机的光源而言，当供电电流不稳定时，可能会出现色彩失真。然而，现有的投影机的电流控制都不太精准，例如，采用脉冲宽度调制方式来控制恒定输出电流的方式，其大致包括如下步骤：由微控制器产生脉冲宽度调制信号，再在恒流驱动器端积分成电压信号进而控制恒流驱动芯片的设置电流脚或反馈脚来控制电流。通常，积分后的电压信号会受高电平电压误差的影响，此外，现有的投影机中的系统控制端与电源驱动电源是两个独立的部件，它们之间通常都采用较长距离的传输线来连接，也会引起较强的传输干扰，因此最终会导致恒定电流很难进行精准控制。
 技术解决方案
有鉴于此，本发明实施例提供一种投影装置、光源系统及其数字控制电流的方法，以精准的控制恒定输出电流。
第一方面，本发明实施例提供一种光源系统，其包括：
光源模块，用于发射源光；
波长转换装置，包括至少一个分区，所述波长转换装置周期性运动以使所述至少一个分区位于所述源光的光路上；
以及
控制模块，用于接收数字电流控制信息，并将所述数字电流控制信息转换为电压或电流信号，以控制电源驱动单元的输入端来最终控制恒定输出电流。
优选的，所述光源模块包括多个光源，所述多个光源划分多组光源，所述控制模块对每组光源独立控制。
优选的，所述分区呈环形或块状分布于所述波长转换装置上。
优选的，至少一分区涂布有波长转换材料。
优选的，所述控制模块接收系统控制端发送的数字电流控制信息，该控制模块包括电流信息转换单元及电源驱动单元，其中：
所述电流信息转换单元，用于将所述数字电流控制信息直接转换为电压或电流信号；或将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号；
及
所述电源驱动单元，用于接收所述电压或电流信号，并控制恒定输出电流。
优选的，所述电流信息转换单元包括MCU及滤波电路，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，系统控制端发出数字电流控制信息给所述MCU，所述数字电流控制信息经过所述MCU与滤波电路处理后输出一幅度不同的模拟电压信号。
优选的，所述电源驱动单元包括三极管Q13、电流镜像芯片U3、及恒流控制芯片LM3421，其中：
所述幅度不同的模拟电压信号控制所述三极管Q13的导通状态，并通过所述电流镜像芯片U3控制所述恒流控制芯片LM3421的恒流控制脚CSH，以控制恒流控制芯片LM3421的恒定输出电流。
优选的，所述电流信息转换单元包括MCU、数字电位器ISL23418、及分压电阻R276，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，所述系统控制端发出数字电流控制信息给所述MCU，所述MCU通过片选所述数字电位器ISL23418，并通过通信方式把数字电流控制信息转换为电流数字信息，并将所述电流数字信息写入所述数字电位器ISL23418，该数字电位器ISL23418根据写入值转换为对应的电阻值，所述电阻值与分压电阻R276通过外加的基准电压VREF1产生分压电压信号V_C225。
优选的，所述电源驱动单元包括恒流控制器，其中所述分压电压信号V_C225送至恒流控制器的相应引脚上，进而控制恒定输出电流值。
优选的，所述电流数字信息的值为0~127中的任一数值，所述对应的电阻值为0~50K欧姆的任一电阻值，其中0~127间的任一数值X对应的电阻值为：X/127*50K欧姆。
第二方面，本发明实施例还提供一种光源系统控制电流的方法，该方法包括步骤：
将数字电流控制信息转换为电压或电流信号；
将所述电压或电流信号输入电源驱动单元，用以控制所述电源驱动单元的输入端来最终控制恒定输出电流。
第三方面，本发明实施例还提供一种投影装置，该投影装置包括本发明实施例中所述的光源系统。
 有益效果
本发明实施例提供的投影装置、光源系统控制端及其控制电流的方法，可以将数字电流控制信息转换为电压或电流信号；并将所述电压或电流信号输入电源驱动单元，用以控制所述电源驱动单元的输入端来最终控制恒定输出电流。由于增加了用于将数字信号转换为模拟信号的数字传输电路，因此间接缩短了系统控制端与光源电源的电源驱动单元的传输距离，从而避免传输干扰；此外，因为在电源驱动单元上提供了一基准电压，以进一步提高了恒定输出电流的精准度。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据提供的附图获得其他的附图。
图1为本发明实施例一提供的光源系统结构示意图。
图2为本发明实施例二提供的控制模块结构示意图。
图3为本发明实施例三提供的光源系统控制电流的方法的流程图。
图4为本发明实施例一提供的光源系统控制电流的电路原理图。
图5为本发明实施例一提供的光源系统控制电流的电路原理图。
 本发明的最佳实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例一
如图1所示，为本发明实施例一提供的光源系统控制端结构示意图，其包括波长转换装置10、光源模块22及控制模块20。
其中，所述光源模块22，用于发射源光。所述光源模块22可包括多个光源，所述光源可以是激光二极管或其它可控亮度的光学器件。
优选的，所述多个光源也可以依据实际需求将光源划分为几组，以实现独立控制。
波长转换装置10，部分正对该光源模块22的光路，其包括至少一个分区，所述波长转换装置10周期性运动以使所述至少一个分区位于所述源光的光路上。
可以理解的是，该波长转换装置部分正对该光源模块22光路其实是所述波长转换装置周期性运动时，以使分区正对该光源模块22的光路。在图1中，所述光源模块22的源光是直接投射至所述波长转换装置10上。在其它实施例中，可以在所述光源22及波长转换装置10间增加其它光学元件。
具体的，如图中所示，所述波长转换装置10呈圆盘形状，所述波长转换装置划分为红色分区10a，绿色分区10b，蓝色分区10c及黄色分区10d。其中每一分区呈环形分布于所述波长转换装置10上。所述分区10a-10d 中的至少一个涂布有波长转换材料，用于吸收该分区的部分激发光，并发出波长不同于激发光的波长的受激光，亦即可通过分区的波长转换材料来产生不同于光源模块22发出的激发光的其它色光。所述波长转换材料优选为磷光性材料、例如磷光体、纳米材料( 如量子点) 等。此波长转换材料可涂布于波长转换装置10的基板的表面上，或者掺杂于基板的材料内。所述波长转换装置10通过马达（未示出）带动来进行周期性转动。
在其它实施例中，所述波长转换装置也可以呈现其它形状，例如，呈条状或圆桶状。将所述条状或圆桶状波长转换装置可依据实际需求划分多个分区，所述划分的多个分区可以呈块状或条状。所述波长转换装置在马达的带动下可以上下线性周期性运动以让波长转换装置上的至少一个分区位于源光的光路上。
控制模块20，用于接收数字电流控制信息，并将数字电流控制信息转换为电压或电流信号，所述电压或电流信号用以控制电源驱动单元的输入端来最终控制恒定输出电流。
为方便说明，以下结合图4及图5分别阐述如何精准的控制恒定输出电流。
如图4所示，当光源系统控制端中的感应器检测到脉冲信号CW-INDEX时，将该脉冲信号传至MCU（microcontroller unit，微控制单元）的PIN 28脚上，所述MCU接收到该脉冲信号后识别出波长转换装置的起始时刻，与此同时，系统控制端21（如图2所示）给所述MCU发出数字电流控制信息，所述数字电流控制信息经过所述MCU后，从PIN30脚上经过一滤波电路（由电感R65与电容C49组成）处理后输出一幅度不同的模拟电压信号I-LEVEL。在其它实施例中，所述电流控制信息经过MCU及所述滤波电路处理后也可输出电流信号。
所述幅度不同的模拟电压信号I-LEVEL控制三极管Q13的导通状态，并通过电流镜像芯片U3控制恒流控制芯片LM3421的恒流控制脚CSH，由此控制恒流控制芯片LM3421的恒定输出电流，从而控制光源模块的驱动电流。
在其它实施例中，为了让电路更简单，也可以将幅度不同的模拟电压信号I-LIVEL直接输入恒流控制芯片LM3421的恒流控制脚CSH。
同时，在该电路中还提供了电源基准电压VREF2，在本实施例中，所述VREF2的电压值优选为4.2V，因此可以更精准的控制恒定输出电流。
进一步的，在其它实施例中，所述MCU还可用其它方式来替代，例如，数模转换DAC芯片、数字芯片或模拟电路等。
因为数字信号是不受干扰的，在图4中，增加了用于将数字信号转换为模拟信号的数字传输电路，即包括MCU在内的控制信息转换单元电路，因此间接缩短了系统控制端21与光源电源的电源驱动单元202（如图2所示）的传输距离，从而避免传输干扰；此外，在电源驱动单元202上提供了一基准电压VREF2，因此进一步提高了恒定输出电流的精准度。
如图5所示，当MCU（图5中未示出）识别到所述波长转换装置周期性运动的起始时刻时，系统控制端会发出数字电流控制信息给所述MCU，MCU通过片选其中1个数字电位器ISL23418并通过SPI数据线，把数字电流控制信息转换为电流数字信息，并将所述电流数字信息写入该数字电位器ISL23418，该数字电位器ISL23418根据写入值0~127中的某数值，转变为0~50K欧姆的某电阻值。例如数值127对应50K欧姆，其中0~127间的任一数值X对应的电阻值为：X/127*50K欧姆等，电源基准电压VREF1通过分压电阻R276与所述电阻分压，产生分压电压信号V_C225，所述分压电压信号V_C225送至恒流控制器的相应引脚上，进而控制恒定输出电流。
优选的，所述MCU可通过以下通信方式：SPI，RS232，或I2C等将电控制信息转换为电流数字信息。所述数字电位器ISL23418也可以用其它类似功能的元件代替。
因为数字信号是不受干扰的，在图5中，增加了用于将数字信号转换为模拟信号的数字传输电路，即包括MCU及数字电位器ISL23418的控制信息转换单元，因此间接缩短了系统控制端21与光源电源的电源驱动单元202（如图2所示）的传输距离，从而避免传输干扰；此外，因为在电源驱动单元202上提供了一基准电压VREF1，以进一步提高了恒定输出电流的精准度。
所述基准电压VREF1优选为2.5V。
本发明实施例可以接收数字电流控制信息，并将数字电流控制信息转换为电压或电流信号，所述电压或电流信号用以控制电源驱动单元的输入端来最终控制恒定输出电流。由于增加了用于将数字信号转换为模拟信号的数字传输电路，因此间接缩短了系统控制端与光源电源的电源驱动单元的传输距离，从而避免传输干扰；此外，在电源驱动单元上提供了一基准电压，因此进一步提高了恒定输出电流的精准度。
实施例二
图2为本发明实施例二提供的控制模块的与其它部件的连接示意图。在图2中，所述控制模块20分别与系统控制端21及光源模块22相连。
光源模块22与所述控制模块20电性连接，用于依据所述控制模块20输出的恒定电流产生相应源光，并将源光投射至波长转换装置上产生受激发光。
所述控制模块20接收所述系统控制端21发送的数字电流控制信息，并将所述数字电流控制信息转换为电压或电流信号，以控制电源驱动单元的输入端来最终控制恒定输出电流。
所述控制模块20包括电流信息转换单元200及电源驱动单元202，其中：
所述电流信息转换单元200，用于将所述数字电流控制信息直接转换为电压或电流信号；或将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号；及
所述电源驱动单元202，用于接收所述电压或电流信号，并控制恒定输出电流。
具体而言，在图4中，所述电流信息转换单元200包括MCU及滤波电路，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，系统控制端发出数字电流控制信息给所述MCU，所述数字电流控制信息经过所述MCU与滤波电路处理后输出一幅度不同的模拟电压信号。
所述电源驱动单元202包括三极管Q13、电流镜像芯片U3、及恒流控制芯片LM3421，其中：
所述幅度不同的模拟电压信号控制所述三极管Q13的导通状态，并通过所述电流镜像芯片U3控制所述恒流控制芯片LM3421的恒流控制脚CSH，以控制恒流控制芯片LM3421的恒定输出电流。
在图5中，所述电流信息转换单元200包括MCU、数字电位器ISL23418、及分压电阻R276，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，所述系统控制端发出数字电流控制信息给所述MCU，所述MCU通过片选所述数字电位器ISL23418，并通过通信方式把数字电流控制信息转换为电流数字信息，并将所述电流数字信息写入所述数字电位器ISL23418，该数字电位器ISL23418根据写入值转换为对应的电阻值，所述电阻值与分压电阻R276通过外加的基准电压VREF1产生分压电压信号V_C225。
所述电源驱动单元202包括恒流控制器，其中所述分压电压信号V_C225送至恒流控制器的相应引脚上，进而控制恒定输出电流值。
实施例三
图3为本发明实施例三提供的光源系统控制端的控制电流的方法的流程图。该方法包括步骤：
步骤S300，接收数字电流控制信息，并将数字电流控制信息转换为电压或电流信号；
步骤S310，将所述电压或电流信号输入电源驱动单元，用以控制所述电源驱动单元的输入端来最终控制恒定输出电流。
进一步，步骤S300是通过以下方式来实现将数字电流控制信息转换为电压或电流信号：
将所述数字电流控制信息直接转换为电压或电流信号；或
将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号。
实施例四
本发明实施例四还提供一种投影装置，所述投影装置包括本发明实施例中所述的光源系统，可以通过执行本发明实施例中的光源系统的控制电流的方法以实现精准的控制恒定输出电流，以获取更理想亮度及饱和度的光线。
上述产品可执行本发明任意实施例所提供的方法，具备执行方法相应的功能模块和有益效果。未在本实施例中详尽描述的技术细节，可参见本发明任意实施例所提供的方法。
注意，上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本发明进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明构思的情况下，还可以包括更多其他等效实施例，而本发明的范围由所附的权利要求范围决定。

Claims (21)

1、一种光源系统，其特征在于，包括：
光源模块，用于发射源光；
波长转换装置，包括至少一个分区，所述波长转换装置周期性运动以使所述至少一个分区位于所述源光的光路上；
以及
控制模块，用于接收数字电流控制信息，并将所述数字电流控制信息转换为电压或电流信号，以控制电源驱动单元的输入端来最终控制恒定输出电流。
2、根据权利要求1所述的光源系统，其特征在于，所述光源模块包括多个光源，所述多个光源划分多组光源，所述控制模块对每组光源独立控制。
3、根据权利要求2所述的光源系统，其特征在于，所述分区呈环形或块状分布于所述波长转换装置上。
4、根据权利要求3所述的光源系统，其特征在于，至少一分区涂布有波长转换材料。
5、根据权利要求1所述的光源系统，其特征在于，所述控制模块接收系统控制端发送的数字电流控制信息，该控制模块包括电流信息转换单元及电源驱动单元，其中：
所述电流信息转换单元，用于将所述数字电流控制信息直接转换为电压或电流信号；或将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号；
及
所述电源驱动单元，用于接收所述电压或电流信号，并控制恒定输出电流。
6、根据权利要求5所述的光源系统，其特征在于，所述电流信息转换单元包括MCU及滤波电路，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，系统控制端发出数字电流控制信息给所述MCU，所述数字电流控制信息经过所述MCU与滤波电路处理后输出一幅度不同的模拟电压信号。
7、根据权利要求6所述的光源系统，其特征在于，所述电源驱动单元包括三极管Q13、电流镜像芯片U3、及恒流控制芯片LM3421，其中：
所述幅度不同的模拟电压信号控制所述三极管Q13的导通状态，并通过所述电流镜像芯片U3控制所述恒流控制芯片LM3421的恒流控制脚CSH，以控制恒流控制芯片LM3421的恒定输出电流。
8、根据权利要求7所述的光源系统，其特征在于，所述电源驱动单元还提供一基准电压VREF2，所述基准电压VREF2为4.2V。
9、根据权利要求5所述的光源系统，其特征在于，所述电流信息转换单元包括MCU、数字电位器ISL23418、及分压电阻R276，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，所述系统控制端发出数字电流控制信息给所述MCU，所述MCU通过片选所述数字电位器ISL23418，并通过通信方式把数字电流控制信息转换为电流数字信息，并将所述电流数字信息写入所述数字电位器ISL23418，该数字电位器ISL23418根据写入值转换为对应的电阻值，所述电阻值与分压电阻R276通过外加的基准电压VREF1产生分压电压信号V_C225。
10、根据权利要求9所述的光源系统，其特征在于，所述电源驱动单元包括恒流控制器，其中所述分压电压信号V_C225送至恒流控制器的相应引脚上，进而控制恒定输出电流值。
11、根据权利要求9所述的光源系统，其特征在于，所述电流数字信息的值为0~127中的任一数值，所述对应的电阻值为0~50K欧姆的任一电阻值，其中0~127间的任一数值X对应的电阻值为：X/127*50K欧姆。
12、根据权利要求9所述的光源系统，其特征在于，所述MCU通过SPI，RS232 或I2C中的任一种通信方式进行通信。
13、根据权利要求9所述的光源系统，其特征在于，所述基准电压VREF1为2.5V。
14、根据权利要求6-13中任一项所述的光源系统，其特征在于，所述MCU可以用数模转换DAC芯片、数字芯片或模拟电路中的任一种来代替。
15、一种投影装置，其特征在于，所述投影装置包括权利要求1-14中任意一项所述的光源系统。
16、一种光源系统的数字控制电流的方法，其特征在于，该方法包括步骤：
接收数字电流控制信息，并将数字电流控制信息转换为电压或电流信号；
将所述电压或电流信号输入电源驱动单元，用以控制所述电源驱动单元的输入端来最终控制恒定输出电流。
17、根据权利要求16所述的数字控制电流的方法，其特征在于，将电流控制信息转换为电压或电流信号具体包括：
将所述数字电流控制信息直接转换为电压或电流信号；或
将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号。
18、根据权利要求16所述的数字控制电流的方法，其特征在于，还包括步骤：
将所述恒定电流输出至光源模块，以使所述光源模块发出稳定的源光。
19、根据权利要求18所述的数字控制电流的方法，其特征在于，所述光源模块包括多个光源，所述多个光源划分多组光源，所述控制模块对每组光源独立控制。
20、根据权利要求17所述的数字控制电流的方法，其特征在于，所述步骤将所述数字电流控制信息直接转换为电压或电流信号，主要是由MCU及滤波电路进行处理来获得电压或电流信号，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，系统控制端会出数字电流控制信息给所述MCU，所述数字电流控制信息经过所述MCU与所述滤波电路处理后输出一幅度不同的模拟电压信号。
21、根据权利要求17所述的数字控制电流的方法，其特征在于，所述步骤将所述数字电流控制信息转换为电流数字信息，并将所述电流数字信息转换为相应电阻值，通过外加基准电压再转变为电压或电流信号，主要是由MCU、数字电位器ISL23418及分压电阻R276进行处理来获得电压或电流信号，其中：
当所述MCU识别到所述波长转换装置周期性运动的起始时刻时，系统控制端会出数字电流控制信息给所述MCU，所述MCU通过片选所述数字电位器ISL23418，并通过通信方式把数字电流控制信息转换为电流数字信息，并将所述电流数字信息写入所述数字电位器ISL23418，所述数字电位器ISL23418根据写入值转换为对应的电阻值，所述电阻值与所述分压电阻R276通过外加的基准电压VREF1产生分压电压信号V_C225。
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