WO2018107682A1 - 一种光源亮度控制系统、光源系统及投影设备 - Google Patents

一种光源亮度控制系统、光源系统及投影设备 Download PDF

Info

Publication number
WO2018107682A1
WO2018107682A1 PCT/CN2017/088623 CN2017088623W WO2018107682A1 WO 2018107682 A1 WO2018107682 A1 WO 2018107682A1 CN 2017088623 W CN2017088623 W CN 2017088623W WO 2018107682 A1 WO2018107682 A1 WO 2018107682A1
Authority
WO
WIPO (PCT)
Prior art keywords
ambient light
light source
main control
unit
analog
Prior art date
Application number
PCT/CN2017/088623
Other languages
English (en)
French (fr)
Inventor
揭勇
潘乐
李屹
Original Assignee
深圳市光峰光电技术有限公司
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 深圳市光峰光电技术有限公司 filed Critical 深圳市光峰光电技术有限公司
Publication of WO2018107682A1 publication Critical patent/WO2018107682A1/zh

Links

Images

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
    • 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
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present application relates to the field of optical technologies, and in particular, to a light source brightness control system, a light source system, and a projection device.
  • the brightness mode of the light source is fixed, and the high brightness state is maintained even in the nighttime or in the dark environment, not only the laser light source, but even the ordinary light source causes electric energy. Serious waste.
  • the luminous intensity is reduced when the ambient light is weak, thereby rationally using the electric energy source, and responding to the national energy saving The call of the row,
  • the utility model provides a light source brightness control system, which comprises an ambient light detecting unit, a main control unit and a driving unit; the ambient light detecting unit is communicatively connected with the main control unit, and the main control unit is connected to the Drive unit.
  • the ambient light detecting unit detects ambient light and transmits an ambient light signal to the main control unit, the ambient light signal is a digital signal; the main control unit receives the ambient light signal, and the ambient light signal The value is compared with a preset ambient light signal threshold, and an analog voltage control signal is generated according to the result of the comparison and output to the driving unit; the driving unit drives the light source unit to emit light according to the analog voltage control signal.
  • a light source system comprising the above-mentioned light source brightness control System and light source unit connected to it.
  • a projection apparatus comprising the above-described light source system.
  • the utility model can automatically adjust the lighting state of the light source system according to the change of the ambient light, for example, adjusting the opening of the light source system, and adjusting the brightness of the light source system, thereby being able to reasonably use the electric energy source, and responding to the call of the national energy conservation and emission reduction, Very good practical value, great significance.
  • FIG. 1 is a schematic structural view of a light source system according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of an ambient light detecting unit of a light source system according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic structural view of a main control unit of a light source system according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural view of a driving unit of a light source system according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic structural view of a driving module and a light source unit of a light source system according to Embodiment 1 of the present invention
  • FIG. 6 is a diagram showing a correspondence relationship between I CSH current and I LED current of a light source system according to Embodiment 1 of the present invention
  • FIG. 7 is a diagram showing a correspondence relationship between integrated control time and detected illuminance of a light source system according to Embodiment 1 of the present invention.
  • Figure 8 is a diagram showing the correspondence between the illuminance of the fluorescent lamp and the incandescent lamp of the light source system according to the first embodiment of the present invention and the count generated by the ambient light detecting unit.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the light source system of the present embodiment includes an ambient light detecting unit 10, a main control unit 20, a driving unit 30, and a light source unit 50 that are sequentially connected.
  • the ambient light detecting unit 10 and the main control unit 20 are communicatively connected through an IIC communication protocol.
  • the light source unit 50 of the present embodiment is any one of a laser, an LED, a laser array, an LED array, or an array of a combination of a laser and an LED.
  • the working principles of the ambient light detecting unit 10, the main control unit 20, the driving unit 30, and the light source unit 50 are as follows:
  • the ambient light detecting unit 10 detects ambient light and transmits an ambient light signal value to the main control unit, the ambient light signal value being a digital signal.
  • the main control unit 20 receives the ambient light signal value, compares the ambient light signal value with a preset ambient light signal threshold, and generates an analog voltage control signal according to the result of the comparison and outputs the Drive unit.
  • the driving unit 30 is connected to the light source unit 50, and drives the light source unit 50 to emit light according to the analog voltage control signal.
  • the main control unit 20 includes a main control chip 201, a microprocessor 202, a main control register 203, and a digital-to-analog converter 204.
  • the input end of the main control chip 201 is communicatively connected to the ambient light detecting unit 10; the main control chip 201 is also connected to the main control register 203 and the microprocessor 202 respectively; the microprocessor 202 is also connected to the main control register 203.
  • an output of the digital to analog converter 204; the digital to analog converter 204 is coupled to the drive unit 30.
  • the working principle of the main control unit 20 is roughly as follows:
  • the main control chip 201 reads the ambient light signal value of the ambient light detecting unit 10 and stores it in the main control register 203;
  • the microprocessor 202 is coupled to the main control register 203 and the digital to analog converter 204, and the microprocessor 202 compares the ambient light signal value with the preset ambient light signal threshold.
  • an analog voltage control signal for lowering a driving voltage to a first driving voltage when the ambient light signal value is less than a threshold lower limit of the preset ambient light signal, and generating the first driving voltage by the digital-to-analog converter
  • An analog voltage control signal is output to the driving unit
  • the lower limit of the preset ambient light signal threshold is L1
  • the upper limit is L2, where L1 ⁇ L2.
  • the ambient light signal value detected by the ambient light detecting unit 10 is L0.
  • the main control unit 20 When the ambient light signal value L0 is less than the lower limit of the preset ambient light signal threshold, that is, when L0 ⁇ L1, the main control unit 20 generates The analog voltage control signal that reduces the driving voltage to the first driving voltage V1, where V1 ⁇ V0, where V0 is the current driving voltage.
  • the ambient light signal value L0 is within the preset ambient light signal threshold range, that is, when L1 ⁇ L0 ⁇ L2, an analog voltage control signal for maintaining the current driving voltage V0 is generated.
  • the range smaller than the lower limit L1 of the preset ambient light signal threshold may be divided into several regions, and the main control unit 20 A corresponding analog voltage control signal is generated for each zone.
  • the range of the upper limit L2 of the preset ambient light signal threshold may be divided into several areas, and the main control unit 20 generates a corresponding analog voltage control signal for each area.
  • the ambient light detecting unit 10 includes a photodiode 101, a current-to-frequency circuit 102, a counter 103, an ADC (Analog-to-Digital Converter) register 104, and an IIC (Inter-Integrated Circuit, The integrated circuit bus) register 105, the integrated time controller 106; the current to frequency circuit 102 employs an existing commercially available I 2 F circuit.
  • ADC Analog-to-Digital Converter
  • IIC Inter-Integrated Circuit, The integrated circuit bus
  • the photodiode 101 is connected to the current to frequency circuit 102; the current to frequency circuit 102 is connected to the counter 103; the counter 103 is connected to the ADC register 104, the IIC register 105 and the integrated time controller 106, respectively; the IIC register 105 is also connected to the ADC register 104 and integrated time controller 106; and IIC register 105 is communicatively coupled to the master chip of master unit 20 via an IIC communication protocol.
  • the external master device can read the corresponding data from the light source system through the IIC bus to know the current ambient light condition.
  • the photodiode 101 can be specially processed to filter the infrared spectrum and detect only the spectral range sensitive to the human eye.
  • the main control unit 20 includes a main control chip 201, a microprocessor 202, a main control register 203, and a digital-to-analog converter 204.
  • the input end of the main control chip 201 is communicatively connected to the ambient light detecting unit 10; the main control chip 201 is also connected to the main control register 203 and the microprocessor 202 respectively;
  • the processor 202 is also coupled to a main control register 203 and a digital to analog converter 204; the output of the digital to analog converter 204 is coupled to the drive unit 30.
  • the driving unit 30 includes an analog dimming module and a driving module 303; the analog dimming module is connected to the main control unit 20 and the driving module 303, and the driving module 303 is connected to the light source unit 50.
  • the analog dimming module includes an operational amplification circuit 301 and an analog dimming circuit 302.
  • the operational amplifier circuit 301 includes an operational amplifier, an operational amplifier-resistor R1, and an operational amplifier two resistor R2.
  • the positive input terminal of the operational amplifier is connected to the digital-to-analog converter 204, and the negative input terminal thereof is connected to the first end of the operational amplifier R1 and the first end of the operational amplifier two resistor R2, and the output end thereof is connected to the operational amplifier 2
  • the second end of the resistor R2 is coupled to the first resistor R1out, and the second end of the resistor R1 is grounded.
  • the analog dimming circuit 302 includes a first resistor R1out, a second resistor R2out, a third resistor Rbias, a fourth resistor Rcsh, a sixth transistor Q6, a seventh transistor Q7, and an eighth transistor Q8.
  • the base of the seventh transistor Q7 is connected to the base of the eighth transistor Q8 and the collector of the sixth transistor O6, the emitter of which is connected to the VCC pole of the driving module 303, and the collector thereof is connected to the sixth three pole
  • the collector of the transistor Q6; the emitter of the eighth transistor Q8 is connected to the VCC pole of the driving module 303, the collector is connected to the CSH pole of the driving module 303;
  • the base of the sixth transistor Q6 is connected to the first resistor a first end of R1out and a first end of the second resistor R2out, the emitter of which is connected to the first end of the third resistor Rbias;
  • the second end of the first resistor R1out is connected to the output of the operational amplifier; the second resistor R2out and The second end of the third resistor Rbias is grounded; the first end of the fourth resistor Rcsh is connected to the CSH pole of the driving module 303, and the second end thereof is grounded.
  • the driving module 303 uses an LM3421/23 driver, and those skilled in the art can also use an LM3424/29 driver or the like.
  • the CSH terminal of the driving module 303 is connected to the analog dimming circuit 302, and its COMP terminal is grounded through a capacitor CCMP, and its HSP terminal and HSN terminal are connected to the light source unit 50 through a resistor R HSP and a resistor R HSN , respectively.
  • the ambient light detecting unit 10 detects ambient light and transmits an ambient light signal value to the main control unit, the ambient light signal value being a digital signal.
  • the specific process is: when the ambient light of the light source system changes, the photodiode 101 can sense the change of the ambient light to generate a photocurrent that reflects the ambient light information, and the current-to-frequency circuit 102 converts the photocurrent into a corresponding frequency, and the counter 103 will The frequency is converted to a corresponding analog quantity, and the ADC register 104 samples the analog quantity to quantize the analog quantity into a digital (IIC data) ambient light signal value and registers it in the IIC register 105; the integrated time controller 106 is used to define a certain time The range of illumination that can be sensed by ambient light.
  • the main control unit 20 receives the ambient light signal value, compares the ambient light signal value with a preset ambient light signal threshold, and generates an analog voltage control signal according to the result of the comparison and outputs the Drive unit.
  • the specific process is: the main control chip 201 reads the ambient light signal value from the IIC register 105 and stores it in the main control register 203.
  • the microprocessor 202 compares the ambient light signal value with the preset ambient light signal threshold value, and outputs according to the comparison result.
  • Corresponding binary data to digital to analog converter 204 which converts the binary data into an analog voltage control signal and outputs it to the positive input of the operational amplifier of drive unit 30.
  • the driving unit 30 is connected to the light source unit 50, and drives the light source unit 50 to emit light according to the analog voltage control signal.
  • the specific process is: the operational amplifier circuit 301 amplifies the analog voltage control signal and outputs it to the analog dimming circuit 302.
  • the analog dimming circuit 302 outputs a corresponding I CSH current to the driving module 303 according to the amplified analog voltage control signal Vout.
  • the change of the amplified analog voltage control signal Vout causes a change in the current of the base current flowing into the sixth transistor Q6.
  • the change of the current of the base stage causes the current of the collector of the transistor to be a certain ratio.
  • the sixth transistor Q6 collector is connected to the base of the eighth transistor Q8, and the change of the collector current of the sixth transistor Q6 causes the current of the eighth transistor Q8 to change, according to the characteristics of the transistor.
  • the change of the base current of the eighth transistor Q8 will cause a change in the collector current of the eighth transistor Q8 according to a certain ratio, thereby causing a change in the current flowing through the fourth resistor Rcsh, thereby causing a change in the Icsh current.
  • a change in I CSH causes a change in the I LED , thereby realizing a change in laser brightness.
  • I CSH currents correspond to different I LED currents
  • I LED currents the corresponding relationship between I CSH current and I LED current is as shown in FIG. 6 .
  • the operational relationship between the I CSH current and the I LED current can also be derived from the following equations (1) and (2).
  • I CSH is the state current
  • I LED is the operating current for driving the LED lamp to emit light
  • I ADD is the intermediate variable
  • R HSP and R SNS are the resistance values of the resistor R HSP and the resistor R SNS in FIG. 5 respectively
  • R1out, R2out, R BLAS is the resistance value of the first resistor, the second resistor and the third resistor in FIG. 4 respectively
  • V OUT is an output value obtained by the operational amplifier circuit 301 amplifying the analog voltage control signal
  • V BE-Q6 is the sixth three pole. When Q6 is turned on, the voltage drop between its base and emitter.
  • the driving module 303 receives the I CSH current from the analog dimming circuit 302 and obtains a corresponding I LED current according to the I CSH current, and drives the light source unit 50 to emit light with the I LED current, so that the luminous intensity/luminance of the light source unit 50 varies with ambient light.
  • the light and dark changes are adjusted. For example, when the surrounding environment becomes brighter, the light source system controls the light emitting module 50 to emit laser light having a larger light intensity; when the surrounding environment becomes dark, the light source system emits light or even stops emitting light.
  • the correspondence between the integrated control time and the detected illuminance range in the embodiment is, for example, when the integrated control time is set to 100 ms, the detectable illuminance range is 44200 lus, and the precision is 1.35 lus/count, which satisfies the application requirement. .
  • Figure 8 reflects the correspondence between the illuminance of the fluorescent lamp (solid line) and the incandescent lamp (dashed line) and the number of counts (counts) generated by the ambient light detecting unit (due to illumination) under the condition that the counter is set to the integration time of 100 ms. Used as a design reference for technicians.
  • the light source system of the present invention can also be applied as a light source portion in any type of projection device or laser television.
  • the technician can set the gear positions of the light source in a plurality of lighting states, and manually adjust the lighting state in real time, but it is not only labor-intensive, but also difficult to accurately select the lighting state most suitable for the current environment, resulting in time,
  • the serious waste of energy and manpower increases the difficulty of users.
  • the utility model can automatically adjust the lighting state of the light source system according to the change of the ambient light, for example, adjusting whether the light source system is turned on, and adjusting the brightness of the light source system, thereby being able to reasonably use the electric energy source, and responding to the call of the national energy saving and emission reduction, Very good practical value, great significance.

Abstract

本实用新型公开了一种光源亮度控制系统、光源系统及投影设备，光源亮度控制系统应用在光源系统和投影设备中，光源亮度控制系统包括依次连接的环境光检测单元、主控单元、驱动单元。环境光检测单元检测环境光，并将环境光信号传送至主控单元，环境光信号是数字信号；主控单元依据环境光信号生成模拟电压控制信号并输出至驱动单元；驱动单元根据模拟电压控制信号驱动光源单元发光。本实用新型根据环境光的变化自动调节光源系统的发光状态，从而能够合理使用电力能源，响应了国家节能减排的号召，具有非常好的实用价值，意义重大。

Description

一种光源亮度控制系统、光源系统及投影设备 技术领域
本申请涉及光学技术领域，具体涉及一种光源亮度控制系统、光源系统及投影设备。
背景技术
当今世界，环境的污染、能源的紧缺唤醒了世界各国人民的节能减排意识，肩负着环境保护、节能减排使命的激光逐渐被社会认可和接受。人们正通过各种途径寻求新的节能方式，随着应用激光的产品的制造成本越来越低，更多领域开始使用激光，相比传统光源，激光光强更大、光束更加集中，光源优势明显，但在使用过程中却存在严重的能源浪费现象。在光学技术领域，以现有的投影机为例，光源亮度模式固定，即使在夜间或者光线较暗的环境下也保持着高亮度状态，不仅是激光光源，即使是普通光源也会造成电能的严重浪费。
实用新型内容
在光学技术领域，尤其是对于投影设备，为了使设备能够根据环境光的明暗变化而改变其光源的发光强度，在环境光变弱时减小发光强度，从而合理使用电力能源，响应国家节能减排的号召，
本实用新型提出了一种光源亮度控制系统，其包括环境光检测单元、主控单元及驱动单元；所述环境光检测单元与所述主控单元通信连接，所述主控单元连接至所述驱动单元。所述环境光检测单元检测环境光，并将环境光信号传送至所述主控单元，所述环境光信号是数字信号；所述主控单元接收所述环境光信号，将所述环境光信号值与预设环境光信号阈值进行比对，并依据所述比对的结果生成模拟电压控制信号并输出至所述驱动单元；所述驱动单元根据所述模拟电压控制信号驱动光源单元发光。
根据本实用新型的第二方面，提供一种光源系统，其包括上述光源亮度控 制系统和与之相连接的光源单元。
根据本实用新型的第三方面，提供一种投影设备，其包括上述光源系统。
本实用新型可以根据环境光的变化自动调节光源系统的发光状态，例如调节光源系统的开启，以及调节光源系统的发光明暗程度，从而能够合理使用电力能源，响应了国家节能减排的号召，具有非常好的实用价值，意义重大。
附图说明
图1为本实用新型实施例一的光源系统的结构示意图；
图2为本实用新型实施例一的光源系统的环境光检测单元结构示意图；
图3为本实用新型实施例一的光源系统的主控单元结构示意图；
图4为本实用新型实施例一的光源系统的驱动单元结构示意图；
图5为本实用新型实施例一的光源系统的驱动模块和光源单元结构示意图；
图6为本实用新型实施例一的光源系统的ICSH电流与ILED电流的对应关系图；
图7为本实用新型实施例一的光源系统的集成控制时间与检测照度对应关系图；
图8为本实用新型实施例一的光源系统的日光灯和白炽灯的照度与环境光检测单元产生的计数的对应关系图。
具体实施方式
下面通过具体实施方式结合附图对本申请作进一步详细说明。
实施例一：
如图1所示，本实施例的光源系统包括依次相连接的环境光检测单元10、主控单元20、驱动单元30及光源单元50。其中，环境光检测单元10和主控单元20通过IIC通讯协议通信连接。
本实施例的光源单元50为激光器、LED、激光器阵列、LED阵列、或激光器与LED组合的阵列中的任一种。
所述环境光检测单元10、主控单元20、驱动单元30及光源单元50的工作原理大致如下：
所述环境光检测单元10检测环境光，并将环境光信号值传送至所述主控单元，所述环境光信号值是数字信号。
所述主控单元20接收所述环境光信号值，将所述环境光信号值与预设环境光信号阈值进行比对，并依据所述比对的结果生成模拟电压控制信号并输出至所述驱动单元。
所述驱动单元30与光源单元50连接，根据所述模拟电压控制信号驱动光源单元50发光。
其中，所述主控单元20，如图3所示，包括主控芯片201、微处理器202、主控寄存器203、数字模拟转换器204。其中，所述主控芯片201的输入端与环境光检测单元10通信连接；主控芯片201还分别与主控寄存器203和微处理器202相连接；微处理器202还连接至主控寄存器203和数字模拟转换器204；数字模拟转换器204的输出端连接至驱动单元30。所述主控单元20的工作原理大致如下：
所述主控芯片201读取所述环境光检测单元10的环境光信号值并存储于所述主控寄存器内203；
所述微处理器202连接至所述主控寄存器203和所述数字模拟转换器204，所述微处理器202将所述环境光信号值与所述预设环境光信号阈值进行比对，
当所述环境光信号值小于所述预设环境光信号阈值下限时，生成将驱动电压降低至第一驱动电压的模拟电压控制信号，并通过所述数字模拟转换器将所述第一驱动电压的模拟电压控制信号输出至所述驱动单元；
当所述环境光信号值处于所述预设环境光信号阈值范围内时，生成维持当前驱动电压的模拟电压控制信号，并通过所述数字模拟转换器将所述当前驱动电压的模拟电压控制信号输出至所述驱动单元；
当所述环境光信号值大于所述预设环境光信号阈值上限时，生成将驱动电压升高至第二驱动电压的电压控制信号，并通过所述数字模拟转换器将所述第 二驱动电压的模拟电压控制信号输出至所述驱动单元。
具体而言，若预设环境光信号阈值的下限为L1，上限为L2，其中L1＜L2。而环境光检测单元10检测到的环境光信号值为L0，当所述环境光信号值L0小于所述预设环境光信号阈值下限时，也即L0＜L1时，所述主控单元20生成将驱动电压降低至第一驱动电压V1的模拟电压控制信号，其中V1＜V0，其中V0为当前驱动电压。当所述环境光信号值L0处于所述预设环境光信号阈值范围时，也即L1≤L0≤L2时，生成维持当前驱动电压V0的模拟电压控制信号。
当所述环境光信号L0大于所述预设环境光信号阈值上值时，也即L0＞L2时，生成将驱动电压升高至第二驱动电压V2的模拟电压控制信号，其中V2＞V0。
在其它实施例中，为了进一步优化光源系统的调光的精度，当L0＜L1时，可以将小于所述预设环境光信号阈值下限L1的范围分为若干个区域，所述主控单元20针对每个区域生成相应的模拟电压控制信号。同理，当L0＞L2时，也可以将大厦于所述预设环境光信号阈值上限L2的范围分为若干个区域，所述主控单元20针对每个区域生成相应的模拟电压控制信号。
如图2所示，环境光检测单元10包括光电二极管101、电流转频率电路102、计数器103、ADC(Analog-to-Digital Converter，模拟/数字转换器)寄存器104、IIC(Inter-Integrated Circuit，集成电路总线)寄存器105、集成时间控制器106；电流转频率电路102采用现有购得的I2F电路。其中，光电二极管101连接至电流转频率电路102；电流转频率电路102连接至计数器103；计数器103分别连接至ADC寄存器104、IIC寄存器105和集成时间控制器106；IIC寄存器105还连接至ADC寄存器104和集成时间控制器106；且IIC寄存器105通过IIC通讯协议通信连接至主控单元20的主控芯片。外部主设备可以通过IIC总线从光源系统读取相应数据从而获知当前环境光情况。光电二极管101可以做特殊处理从而过滤红外光谱，只检测人眼敏感的光谱范围。
如图3所示，主控单元20包括主控芯片201、微处理器202、主控寄存器203、数字模拟转换器204。其中，主控芯片201的输入端与环境光检测单元10通信连接；主控芯片201还分别与主控寄存器203和微处理器202相连接；微 处理器202还连接至主控寄存器203和数字模拟转换器204；数字模拟转换器204的输出端连接至驱动单元30。
驱动单元30包括模拟调光模块及驱动模块303；模拟调光模块连接至主控单元20和驱动模块303，驱动模块303连接至光源单元50。
如图4所示，模拟调光模块包括运算放大电路301和模拟调光电路302。
运算放大电路301包括运算放大器、运放一电阻R1和运放二电阻R2。其中，运算放大器的正极输入端与数字模拟转换器204连接，其负极输入端连接至运放一电阻R1的第一端和运放二电阻R2的第一端，其输出端连接至运放二电阻R2的第二端和第一电阻R1out，运放一电阻R1的第二端接地。
模拟调光电路302包括第一电阻R1out、第二电阻R2out、第三电阻Rbias、第四电阻Rcsh、第六三极管Q6、第七三极管Q7、第八三极管Q8。第七三极管Q7的基极连接至第八三极管Q8的基极和第六晶体管O6的集电极，其发射极连接至驱动模块303的VCC极，其集电极接至第六三极管Q6的集电极；第八三极管Q8的发射极连接至驱动模块303的VCC极，其集电极连接至驱动模块303的CSH极；第六三极管Q6的基极连接至第一电阻R1out的第一端和第二电阻R2out的第一端，其发射极连接至第三电阻Rbias的第一端；第一电阻R1out的第二端连接至运算放大器的输出端；第二电阻R2out和第三电阻Rbias的第二端接地；第四电阻Rcsh的第一端连接至驱动模块303的CSH极，其第二端接地。
如图5所示，驱动模块303采用LM3421/23驱动器，本领域技术人员还可以采用LM3424/29驱动器等。驱动模块303的CSH端连接至模拟调光电路302，其COMP端通过电容CCMP接地，其HSP端和HSN端分别通过电阻RHSP和电阻RHSN连接至光源单元50。
以下简述本实施例的光源系统控制发光的原理：
所述环境光检测单元10检测环境光，并将环境光信号值传送至所述主控单元，所述环境光信号值是数字信号。具体过程是：当光源系统外界的环境光发生变化时，光电二极管101可以感应环境光的变化从而产生反应环境光信息的光电流，电流转频率电路102将光电流按比例转换为相应频率，计数器103将 频率转换为对应模拟量，ADC寄存器104对模拟量进行采样从而将模拟量量化为数字量(IIC数据)的环境光信号值并寄存于IIC寄存器105；集成时间控制器106用于限定一定时间内可感应的环境光的照度范围。
所述主控单元20接收所述环境光信号值，将所述环境光信号值与预设环境光信号阈值进行比对，并依据所述比对的结果生成模拟电压控制信号并输出至所述驱动单元。具体过程是：主控芯片201从IIC寄存器105读取环境光信号值并存储于主控寄存器内203，微处理器202将环境光信号值与预设环境光信号阈值进行对比，根据对比结果输出对应的二进制数据至数字模拟转换器204，数字模拟转换器204将二进制数据转换成模拟电压控制信号并输出至驱动单元30的运算放大器的正极输入端。
所述驱动单元30与光源单元50连接，根据所述模拟电压控制信号驱动光源单元50发光。具体过程是：运算放大电路301对模拟电压控制信号进行放大处理并输出至模拟调光电路302，模拟调光电路302根据放大后的模拟电压控制信号Vout输出对应的ICSH电流至驱动模块303。具体地，放大后的模拟电压控制信号Vout的变化会导致流进第六三极管Q6的基级电流变化，根据三极管特性可知，基级电流的变化会按一定比值导致该三极管集电极电流的变化，第六三极管Q6集电极连接第八三极管Q8的基极，第六三极管Q6集电极电流的变化会导致第八三极管Q8基级电流的变化，根据三极管特性可知，第八三极管Q8基极电流的变化会按一定比值导致该第八三极管Q8集电极电流的变化，从而导致流经第四电阻Rcsh上的电流变化，从而引起Icsh电流的变化，根据公式(2)可知，ICSH的变化会导致ILED的变化，从而实现激光亮度的变化。
其中，不同的ICSH电流对应不同的ILED电流，ICSH电流与ILED电流的对应关系曲线如图6所示，流过光源单元的ILED电流越大，光源单元发光越亮。ICSH电流与ILED电流的运算关系也可由以下公式(1)和公式(2)推导。
Figure PCTCN2017088623-appb-000001
Figure PCTCN2017088623-appb-000002
其中，ICSH为状态电流，ILED为驱动LED灯发光的工作电流，IADD为中间变量，RHSP和RSNS分别为图5中电阻RHSP和电阻RSNS的电阻值，R1out、R2out、RBLAS分别为图4中第一电阻、第二电阻和第三电阻的电阻值，VOUT为运算放大电路301对模拟电压控制信号进行放大后的输出值，VBE-Q6表示第六三极管Q6导通时，其基级和发射极之间的压降。
驱动模块303接收来自模拟调光电路302的ICSH电流并根据ICSH电流得到对应的ILED电流，并以ILED电流驱动光源单元50发光，使得光源单元50的发光强度/亮度随环境光的明暗变化而被调节。例如周围环境变得更亮时，光源系统控制发光模块50发出具有更大光强的激光；周围环境变暗时，光源系统发光减弱甚至停止发光。
如图7所示为本实施例中集成控制时间与检测照度范围的对应关系，例如，当集成控制时间设置为100ms时，可检测的照度范围为44200lus，精度为1.35lus/count，满足应用需求。
图8反应了在计数器设定积分时间为100ms的条件下，日光灯(实线)和白炽灯(虚线)的照度和环境光检测单元(由于光照)产生的count数(计数)的对应关系，可用作技术人员的设计参考。
本实用新型的光源系统还可应用在任何一种投影设备或者激光电视中作为光源部分。
现有技术中，技术人员可以对光源设置数个发光状态的档位，通过手动方式实时调节发光状态，但那样不仅徒耗人力，而且难以准确选择最适于当前环境的发光状态，造成时间、能源与人力的严重浪费，增加了用户的使用难度。 本实用新型可以根据环境光的变化自动调节光源系统的发光状态，例如调节光源系统是否开启，以及调节光源系统的发光明暗程度，从而能够合理使用电力能源，响应了国家节能减排的号召，具有非常好的实用价值，意义重大。
以上内容是结合具体的实施方式对本申请所作的进一步详细说明，不能认定本申请的具体实施只局限于这些说明。对于所属技术领域的普通技术人员来说，在不脱离本申请的构思的前提下，还可以做出若干简单推演或替换。

Claims (10)

  1. 一种光源亮度控制系统，其特征在于，包括环境光检测单元、主控单元及驱动单元；所述环境光检测单元与所述主控单元通信连接，所述主控单元连接至所述驱动单元；
    所述环境光检测单元检测环境光，并将环境光信号值传送至所述主控单元，所述环境光信号值是数字信号；
    所述主控单元接收所述环境光信号值，将所述环境光信号值与预设环境光信号阈值进行比对，并依据所述比对的结果生成模拟电压控制信号并输出至所述驱动单元；
    所述驱动单元与光源单元连接，根据所述模拟电压控制信号驱动光源单元发光。
  2. 如权利要求1所述的系统，其特征在于，所述主控单元包括主控芯片、主控寄存器、微处理器、及数字模拟转换器；
    所述主控芯片的输入端与所述环境光检测单元通信连接，所述主控芯片还分别与所述主控寄存器和所述微处理器相连接，所述主控芯片读取所述环境光检测单元的环境光信号值并存储于所述主控寄存器内；
    所述微处理器连接至所述主控寄存器和所述数字模拟转换器，所述微处理器将所述环境光信号值与所述预设环境光信号阈值进行比对，
    当所述环境光信号值小于所述预设环境光信号阈值下限时，生成将驱动电压降低至第一驱动电压的模拟电压控制信号，并通过所述数字模拟转换器将所述第一驱动电压的模拟电压控制信号输出至所述驱动单元；
    当所述环境光信号值处于所述预设环境光信号阈值范围内时，生成维持当前驱动电压的模拟电压控制信号，并通过所述数字模拟转换器将所述当前驱动电压的模拟电压控制信号输出至所述驱动单元；
    当所述环境光信号值大于所述预设环境光信号阈值上限时，生成将驱动电压升高至第二驱动电压的电压控制信号，并通过所述数字模拟转换器将所述第二驱动电压的模拟电压控制信号输出至所述驱动单元。
  3. 如权利要求1所述的系统，其特征在于，
    所述环境光检测单元包括光敏元件、电流转频率电路、计数器、ADC寄存器、IIC寄存器；
    所述光敏元件连接至所述电流转频率电路，通过感应环境光的变化以产生光电流，并将所述光电流输出至所述电流转频率电路；
    所述电流转频率电路连接至所述计数器，将所述光电流转换为相应频率，并将频率输出至所述计数器；
    所述计数器连接至所述ADC寄存器，将频率转换为对应模拟量，并将模拟量输出至ADC寄存器；
    所述ADC寄存器连接至所述IIC寄存器，对模拟量进行采样从而将模拟量量化为数字量的环境光信号并寄存于所述IIC寄存器；
    所述IIC寄存器与所述主控单元通过IIC通讯协议通信连接。
  4. 如权利要求3所述的系统，其特征在于，
    所述环境光检测单元还包括集成时间控制器，所述集成时间控制器与所述计数器和所述IIC寄存器相连接，用于限定所述光敏元件在一定时间内可感应的环境光的照度范围。
  5. 如权利要求1所述的系统，其特征在于，所述驱动单元包括模拟调光模块及驱动模块；
    所述模拟调光模块连接至所述主控单元和所述驱动模块；
    所述主控单元输出模拟电压控制信号至所述模拟调光模块；
    所述模拟调光模块根据模拟电压控制信号输出对应的状态电流至所述驱动模块；
    所述驱动模块根据状态电流驱动光源单元发光。
  6. 如权利要求5所述的系统，其特征在于，
    所述模拟调光模块包括运算放大电路和模拟调光电路；
    所述模拟调光电路包括第一电阻、第二电阻、第三电阻、第四电阻、第六三极管、第七三极管、第八三极管；
    所述第七三极管的基极连接至所述第八三极管的基极和所述第六晶体管的集电极，其发射极连接至所述驱动模块的VCC极，其集电极接至所述第六三极管的集电极；
    所述第八三极管的基极连接至所述第七三极管的基极，其发射极连接至所述驱动模块的VCC极，其集电极连接至所述驱动模块；
    所述第六三极管的基极连接至所述第一电阻的第一端和所述第二电阻的第一端，其集电极连接至所述第七三极管的集电极和基极，其发射极连接至所述第三电阻的第一端；
    所述第一电阻的第一端连接至所述第六三极管的基极，其第二端连接至所述运算放大电路的输出端；
    所述第二电阻的第一端连接至所述第六三极管的基极，其第二端接地；
    所述第三电阻的第一端连接至所述第六三极管的发射极，其第二端接地；
    所述第四电阻的第一端连接至所述驱动模块，其第二端接地；
    所述运算放大电路的输入和输出分别连接至所述主控单元和所述第一电阻；
    所述运算放大电路对所述主控单元输出的模拟电压控制信号进行放大处理并输出至所述模拟调光电路；
    所述模拟调光电路根据放大后的模拟电压控制信号输出对应的状态电流至所述驱动模块。
  7. 如权利要求6所述的系统，其特征在于，
    所述驱动模块采用LM3421/23驱动器或者LM3424/29驱动器；
    所述驱动模块的CSH端连接至所述模拟调光电路，其接收来自所述模拟调光电路的状态电流；
    所述驱动模块的COMP端通过电容接地；所述驱动模块的HSP端和HSN端分别通过电阻连接至所述光源单元；
    所述驱动模块根据状态电流得到对应的ILED电流，并以ILED电流驱动所述光源单元发光。
  8. 一种光源系统，其特征在于，包括如权利要求1-7任一项所述的光源亮度控制系统和光源单元；
    所述光源单元连接至所述光源亮度控制系统的驱动单元。
  9. 如权利要求8所述的光源系统，其特征在于，
    所述光源单元为激光器、LED、激光器阵列、LED阵列、或激光器与LED组合的阵列中的任一种。
  10. 一种投影设备，其特征在于，包括如权利要求8或9所述的光源系统。
PCT/CN2017/088623 2016-11-17 2017-06-16 一种光源亮度控制系统、光源系统及投影设备 WO2018107682A1 (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201621234504 2016-11-17
CN201621357798.6U CN206442567U (zh) 2016-11-17 2016-12-12 一种光源亮度控制系统、光源系统及投影设备
CN201621357798.6 2016-12-12

Publications (1)

Publication Number Publication Date
WO2018107682A1 true WO2018107682A1 (zh) 2018-06-21

Family

ID=59646919

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/088623 WO2018107682A1 (zh) 2016-11-17 2017-06-16 一种光源亮度控制系统、光源系统及投影设备

Country Status (2)

Country Link
CN (1) CN206442567U (zh)
WO (1) WO2018107682A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933900A (zh) * 2018-09-04 2018-12-04 深圳市威特迪科技有限公司 一种摄像机补光控制电路及其控制方法
CN113552556A (zh) * 2020-04-23 2021-10-26 上海禾赛科技有限公司 用于激光雷达的光电探测模块、激光雷达和环境光检测方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110858052B (zh) * 2018-08-23 2022-08-09 深圳光峰科技股份有限公司 投影仪亮度调节系统及亮度调节方法
CN110361918A (zh) * 2019-07-09 2019-10-22 深圳市火乐科技发展有限公司 一种自动调光系统及具有其的投影机
CN112788809A (zh) * 2019-10-23 2021-05-11 致伸科技股份有限公司 灯光亮度调节装置
CN113163539B (zh) * 2021-04-16 2023-06-20 横店集团得邦照明股份有限公司 一种通过灯光闪烁实现同步亮灯的投光灯及其实现方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201765803U (zh) * 2010-05-20 2011-03-16 桦晶科技股份有限公司 电子装置的背光光源强弱调整结构
CN102568407A (zh) * 2010-12-28 2012-07-11 瀚宇彩晶股份有限公司 液晶显示器及其驱动方法
CN103148398A (zh) * 2013-04-06 2013-06-12 湖南科技学院 一种学习用护眼台灯及其控制方法
CN103517528A (zh) * 2013-10-11 2014-01-15 李锡文 基于独立安装led感应灯的自由式群控系统及控制方法
JP5655265B2 (ja) * 2008-11-04 2015-01-21 セイコーエプソン株式会社 プロジェクタ、画質調整方法、画質調整プログラム及び記録媒体

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5655265B2 (ja) * 2008-11-04 2015-01-21 セイコーエプソン株式会社 プロジェクタ、画質調整方法、画質調整プログラム及び記録媒体
CN201765803U (zh) * 2010-05-20 2011-03-16 桦晶科技股份有限公司 电子装置的背光光源强弱调整结构
CN102568407A (zh) * 2010-12-28 2012-07-11 瀚宇彩晶股份有限公司 液晶显示器及其驱动方法
CN103148398A (zh) * 2013-04-06 2013-06-12 湖南科技学院 一种学习用护眼台灯及其控制方法
CN103517528A (zh) * 2013-10-11 2014-01-15 李锡文 基于独立安装led感应灯的自由式群控系统及控制方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108933900A (zh) * 2018-09-04 2018-12-04 深圳市威特迪科技有限公司 一种摄像机补光控制电路及其控制方法
CN113552556A (zh) * 2020-04-23 2021-10-26 上海禾赛科技有限公司 用于激光雷达的光电探测模块、激光雷达和环境光检测方法

Also Published As

Publication number Publication date
CN206442567U (zh) 2017-08-25

Similar Documents

Publication Publication Date Title
WO2018107682A1 (zh) 一种光源亮度控制系统、光源系统及投影设备
US7705541B2 (en) Light control circuit
US20080272277A1 (en) Apparatus and method for controlling brightness of light source and displaying apparatus
CN101662861B (zh) 适应性自动调光的光电装置
TW200614129A (en) Light emitting element drive device and display system
CN101877926A (zh) 一种自动调光控制系统
US20140214362A1 (en) Method and system of detecting flickering frequency of ambient light source
CN201821537U (zh) 一种自动调光台灯
JP2012038509A (ja) 光検出装置、照明装置および可視光通信装置
CN203162644U (zh) Led智能照明装置
CN103068117A (zh) 一种发光亮度可调节的led驱动器
US8692483B2 (en) Intelligent power control system
CN103068091A (zh) 智能型电源调控系统
CN105873297A (zh) 光控电路及应用所述光控电路的灯具
CN210124031U (zh) 一种根据环境照度自适应调光的led照明系统
CN208208306U (zh) 背光亮度随环境变化的电路
US8405315B2 (en) Energy-saving lamp
CN203251488U (zh) 一种教室灯光智控装置
JP2008091301A (ja) 調光回路
CN216795328U (zh) 一种发光二极管控制电路
US8692484B2 (en) Automatic light regulating power supply device
CN103068092A (zh) 自动调光的电源供应器
CN211509345U (zh) 一种亮度控制调光器及led照明系统
CN219644148U (zh) 一种背光亮度自适应电路
CN103167683A (zh) 自动功率控制系统、装置、补偿电压运算模块及检测模块

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17880208

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17880208

Country of ref document: EP

Kind code of ref document: A1