WO2016184251A1 - 一种用于激光模组的控制电路及具有该控制电路的激光准直仪 - Google Patents

一种用于激光模组的控制电路及具有该控制电路的激光准直仪 Download PDF

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WO2016184251A1
WO2016184251A1 PCT/CN2016/077099 CN2016077099W WO2016184251A1 WO 2016184251 A1 WO2016184251 A1 WO 2016184251A1 CN 2016077099 W CN2016077099 W CN 2016077099W WO 2016184251 A1 WO2016184251 A1 WO 2016184251A1
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power
laser diode
control circuit
laser
standard
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PCT/CN2016/077099
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English (en)
French (fr)
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张瓯
傅俊杰
朱宏军
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张瓯
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Priority claimed from CN201510263597.3A external-priority patent/CN104901158A/zh
Priority claimed from CN201520333514.9U external-priority patent/CN204696447U/zh
Application filed by 张瓯 filed Critical 张瓯
Publication of WO2016184251A1 publication Critical patent/WO2016184251A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor

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  • the present invention relates to the field of optoelectronic devices, and more particularly to a control circuit for a laser module and a laser collimator having the same.
  • the existing power control mode for the green laser diode LD is to indirectly control the output power of the laser diode LD, as follows:
  • Constant voltage control adding a constant voltage across the laser diode LD.
  • the control circuit is simple, but the output power is unstable due to temperature, which easily leads to the output power exceeding the safety standard;
  • Constant current control keeps the current flowing through the laser diode LD constant. This method can control the laser output power within a certain range, but the control circuit is complicated and uneconomical.
  • an object of the present invention is to provide a control circuit for a laser module and a laser collimator having the same, which is simple and economical in structure, and effectively avoids power overrun of the laser diode LD. The possible harm to the human body in the case.
  • the invention discloses a control circuit for a laser module, comprising: a laser diode LD and a PD feedback module for detecting the power of the laser diode LD, the PD feedback module includes a photodiode PD, the PD feedback module further includes: a PD monitoring unit, wherein a standard power is preset therein, and the photodiode PD Connecting, receiving the power of the laser diode LD detected by the photodiode, and comparing the power of the laser diode LD with the standard power to output a control command; the control circuit further comprising: an LD power control circuit, The PD monitoring unit is connected, receives the control command and controls the power of the laser diode LD accordingly.
  • the control command when the power of the laser diode LD is less than the standard power, the control command is: suppressing a power drop of the laser diode LD; when the power of the laser diode LD is greater than the standard power, The control command is to suppress the power rise of the laser diode LD.
  • the standard power is a power setting range.
  • the power setting range is configured such that a median of the power setting range is an ideal power value of the laser diode LD; a maximum value and a minimum value of the power setting range and the power ideal The difference in values does not exceed 5% of the ideal power value.
  • the invention also discloses a laser collimator, comprising the above control circuit.
  • the circuit is simple and the cost is low;
  • FIG. 1 is a schematic diagram of a system for a control circuit of a laser module in accordance with a preferred embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a control circuit for a laser module in accordance with a preferred embodiment of the present invention.
  • a control circuit for a laser module includes a laser diode LD for emitting laser light for collimation; and a PD feedback module for monitoring power of the laser diode LD, wherein the PD feedback module includes a photodiode
  • the PD changes the magnitude of the current in the circuit according to the detected intensity of the laser light emitted by the laser diode LD.
  • the PD feedback module further includes a PD monitoring unit, which presets a standard power, which is the power that the laser diode LD should work correctly.
  • the PD monitoring unit is connected to the photodiode PD.
  • the control circuit further includes an LD power control circuit connected to the PD monitoring unit, receiving the above command, and adjusting the power of the laser diode LD according to the instruction.
  • the power adjustment of the laser diode LD specifically includes:
  • the PD monitoring unit determines that the power of the laser diode LD is less than the standard power and cannot continue to decrease. Therefore, the control command issued is: maintaining or increasing the power of the laser diode LD so that it cannot be lowered again;
  • the PD monitoring unit determines that the power of the laser diode LD is greater than the standard power and must not continue to rise. Therefore, the control command issued is: maintaining or reducing the power of the laser diode LD so that it does not rise any more.
  • the standard power in the above embodiment may be a power setting range, which may be adjusted according to actual application conditions.
  • the power setting range is configured to set the power ideal value of the laser diode LD to the median of the power setting range, that is, the power ideal value is laterally expanded as the most ideal value, and the expanded range needs to meet the power setting range.
  • the difference between the maximum and minimum values and the ideal power value does not exceed 5% of the ideal power value. Regardless of how the power of the laser diode LD changes, it will always fluctuate within ⁇ 5% of the ideal value, which is in line with practical applications. Claim.
  • the drift of the laser diode LD can be controlled by the above control method.
  • the above control circuit can also be directly applied to the laser module of the laser collimator, and the power value of the laser diode LD is corrected during the use of the laser collimator.
  • FIG. 2 is a circuit diagram of a control circuit for a laser module in accordance with a preferred embodiment of the present invention.
  • the PD monitoring unit After receiving the power of the laser diode LD from the photodiode PD, the PD monitoring unit sends a high and low level to the transistor Q1 to control its turn-on and turn-off.
  • the switch Q2 amplifies the current across R2 according to the switch Q1 when it is turned on until the power of the laser diode LD satisfies the standard power.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

一种用于激光模组的控制电路，包括：激光二极管LD及用于检测所述激光二极管LD功率的PD反馈模块，所述PD反馈模块包括光敏二极管PD，所述PD反馈模块还包括：PD监控单元，其内预设一标准功率，与所述光敏二极管PD连接，接收所述光敏二极管检测的激光二极管LD的功率，并比较所述激光二极管LD的功率与所述标准功率从而输出一控制指令；所述控制电路还包括：LD功率控制电路，与所述PD监控单元连接，接收所述控制指令并相应地控制所述激光二极管LD的功率。采用上述技术方案后，激光二极管LD的功率将不再任意变换，即便受到温度影响，也将保持稳定在合理范围内。

Description

一种用于激光模组的控制电路及具有该控制电路的激光准直仪 技术领域
本发明涉及光电设备领域，尤其涉及一种用于激光模组的控制电路及具有该控制电路的激光准直仪。
技术背景
由于绿光的半导体激光器相对于红光在可视度方面的优势，越来越多的可发射绿光的半导体激光器被应用于激光投线仪。
现有对绿光激光二极管LD的功率控制方式均为间接控制激光二极管LD的输出功率，具体如下：
1.恒压控制，在激光二极管LD两端加一个恒定电压。此控制方式电路简单，但输出功率受温度影响不稳定，易导致输出功率超出安全标准；
2.恒流控制，使流过激光二极管LD的电流保持恒定，此方式能够将激光输出功率控制在一定范围，但控制电路复杂且不经济。
因此，需要一种新型的控制激光二极管LD输出功率的控制电路，在电路简单的基础上，可保证输出功率不受温度影响，电路成本低。
发明概要
为了克服上述技术缺陷，本发明的目的在于提供一种用于激光模组的控制电路及具有该控制电路的激光准直仪，电路结构简单经济实惠，有效地避免了激光二极管LD的功率超限情况下对人体可能造成的危害。
本发明公开了一种用于激光模组的控制电路，包括：激光二极管LD及 用于检测所述激光二极管LD功率的PD反馈模块，所述PD反馈模块包括光敏二极管PD，所述PD反馈模块还包括：PD监控单元，其内预设一标准功率，与所述光敏二极管PD连接，接收所述光敏二极管检测的激光二极管LD的功率，并比较所述激光二极管LD的功率与所述标准功率从而输出一控制指令；所述控制电路还包括：LD功率控制电路，与所述PD监控单元连接，接收所述控制指令并相应地控制所述激光二极管LD的功率。
优选地，当所述激光二极管LD的功率小于所述标准功率时，所述控制指令为：抑制所述激光二极管LD的功率下降；当所述激光二极管LD的功率大于所述标准功率时，所述控制指令为：抑制所述激光二极管LD的功率上升。
优选地，所述标准功率为一功率设定范围。
优选地，所述功率设定范围配置为：所述功率设定范围的中位数为所述激光二极管LD的功率理想值；所述功率设定范围的最大值和最小值与所述功率理想值的差不超过所述功率理想值的5％。
本发明还公开了一种激光准直仪，包括上述控制电路。
采用了上述技术方案后，与现有技术相比，具有以下有益效果：
1.避免了功率超限或功率过低的问题；
2.电路简单，成本低廉；
3.消除了输出功率受温度影响的漂移。
附图说明
图1为符合本发明一优选实施例的用于激光模组的控制电路的系统示意 图；
图2为符合本发明一优选实施例的用于激光模组的控制电路的电路示意图。
发明内容
以下结合附图与具体实施例进一步阐述本发明的优点。
参阅图1，本发明一实施例中，用于激光模组的控制电路包括激光二极管LD，发出用于准直的激光；PD反馈模块，监测激光二极管LD的功率，其中PD反馈模块包括光敏二极管PD，其根据检测到的激光二极管LD发出的激光的光强改变电路中的电流大小。为了能对激光二极管LD的功率进行实时变化，PD反馈模块还包括有一PD监控单元，其内预设一标准功率，该标准功率为激光二极管LD应当正确工作的功率。该PD监控单元与光敏二极管PD连接，当光敏二极管PD检测完激光二极管LD的功率后，将检测的功率发送至PD监控单元，由PD监控单元比较内设的标准功率与接收到的当前激光二极管LD的功率，并根据两者的比较结果输出一控制指令。此外，控制电路还包括有一LD功率控制电路，与PD监控单元连接，接收上述指令，并根据指令对激光二极管LD的功率进行相应地调整。
一实施例中，对激光二极管LD的功率调整具体包括：
①当比较结果为：激光二极管LD的功率小于所述标准功率时
PD监控单元判断为激光二极管LD的功率已经小于标准功率，不得继续下降，因此，发出的控制指令为：保持或提高激光二极管LD的功率，使其不得再下降；
②当比较结果为：激光二极管LD的功率大于所述标准功率时
PD监控单元判断为激光二极管LD的功率已经大于标准功率，不得继续上升，因此，发出的控制指令为：保持或降低激光二极管LD的功率，使其不得再上升。
由于对激光二极管LD的功率要求通常在实际应用中只需要满足在一个区间段内即可，因此，上述实施例中的标准功率可以是一功率设定范围，该范围可能根据实际应用情况调整。具体地，该功率设定范围配置为：将激光二极管LD的功率理想值设为该功率设定范围的中位数，即将功率理想值最为基准值横向展开，展开的范围需满足功率设定范围的最大值和最小值与功率理想值的差不超过功率理想值的5％，则无论激光二极管LD的功率如何改变，其始终将在理想值的±5％的范围内波动，符合实际应用的要求。
由此，即便激光二极管LD的功率受温度影响上升或下降时，也可通过上述控制方式控制激光二极管LD的漂移。
上述控制电路也可直接应用在激光准直仪的激光模组内，在激光准直仪的使用过程中，修正激光二极管LD的功率值。
参阅图2，为符合本发明一优选实施例的用于激光模组的控制电路的电路示意图。PD监控单元接收到光敏二极管PD发来的激光二极管LD的功率后，发送高低电平至三极管Q1，以控制其导通和关断。而开关管Q2则根据开关管Q1在导通时对R2两端的电流放大，直至激光二极管LD的功率满足标准功率。
应当注意的是，本发明的实施例有较佳的实施性，且并非对本发明作任何形式的限制，任何熟悉该领域的技术人员可能利用上述揭示的技术内容变更或修饰为等同的有效实施例，但凡未脱离本发明技术方案的内容，依据本 发明的技术实质对以上实施例所作的任何修改或等同变化及修饰，均仍属于本发明技术方案的范围内。

Claims (5)

  1. 一种用于激光模组的控制电路，包括：激光二极管LD及用于检测所述激光二极管LD功率的PD反馈模块，所述PD反馈模块包括光敏二极管PD，其特征在于，所述PD反馈模块还包括：
    PD监控单元，其内预设一标准功率，与所述光敏二极管PD连接，接收所述光敏二极管检测的激光二极管LD的功率，并比较所述激光二极管LD的功率与所述标准功率从而输出一控制指令；
    所述控制电路还包括：LD功率控制电路，与所述PD监控单元连接，接收所述控制指令并相应地控制所述激光二极管LD的功率。
  2. 如权利要求1所述的控制电路，其特征在于，
    当所述激光二极管LD的功率小于所述标准功率时，所述控制指令为：抑制所述激光二极管LD的功率下降；
    当所述激光二极管LD的功率大于所述标准功率时，所述控制指令为：抑制所述激光二极管LD的功率上升。
  3. 如权利要求2所述的控制电路，其特征在于，
    所述标准功率为一功率设定范围。
  4. 如权利要求3所述的控制电路，其特征在于，
    所述功率设定范围配置为：所述功率设定范围的中位数为所述激光二极管LD的功率理想值；
    所述功率设定范围的最大值和最小值与所述功率理想值的差不超过所述功率理想值的5％。
  5. 一种激光准直仪，其特征在于，包括如权利要求1-4任一项所述的控制电路。
PCT/CN2016/077099 2015-05-21 2016-03-23 一种用于激光模组的控制电路及具有该控制电路的激光准直仪 WO2016184251A1 (zh)

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CN201510263597.3A CN104901158A (zh) 2015-05-21 2015-05-21 一种用于激光模组的控制电路及具有该控制电路的激光准直仪
CN201520333514.9U CN204696447U (zh) 2015-05-21 2015-05-21 一种用于激光模组的控制电路及具有该控制电路的激光准直仪
CN201510263597.3 2015-05-21
CN201520333514.9 2015-05-21

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1669250A (zh) * 2002-07-19 2005-09-14 松下电器产业株式会社 脉冲串信号消光比控制电路及其集成电路、脉冲串信号消光比控制方法、计算机程序以及激光二极管驱动电路
CN1694321A (zh) * 2005-06-09 2005-11-09 上海大学 泵浦激光器自动功率及温度控制装置
JP2010129602A (ja) * 2008-11-25 2010-06-10 Shinko Electric Ind Co Ltd 光源制御回路および直接露光装置
CN102508365A (zh) * 2011-11-01 2012-06-20 浙江大学 一种光束漂移实时自动校正补偿的方法和装置
CN104901158A (zh) * 2015-05-21 2015-09-09 常州华达科捷光电仪器有限公司 一种用于激光模组的控制电路及具有该控制电路的激光准直仪
CN204696447U (zh) * 2015-05-21 2015-10-07 常州华达科捷光电仪器有限公司 一种用于激光模组的控制电路及具有该控制电路的激光准直仪

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1669250A (zh) * 2002-07-19 2005-09-14 松下电器产业株式会社 脉冲串信号消光比控制电路及其集成电路、脉冲串信号消光比控制方法、计算机程序以及激光二极管驱动电路
CN1694321A (zh) * 2005-06-09 2005-11-09 上海大学 泵浦激光器自动功率及温度控制装置
JP2010129602A (ja) * 2008-11-25 2010-06-10 Shinko Electric Ind Co Ltd 光源制御回路および直接露光装置
CN102508365A (zh) * 2011-11-01 2012-06-20 浙江大学 一种光束漂移实时自动校正补偿的方法和装置
CN104901158A (zh) * 2015-05-21 2015-09-09 常州华达科捷光电仪器有限公司 一种用于激光模组的控制电路及具有该控制电路的激光准直仪
CN204696447U (zh) * 2015-05-21 2015-10-07 常州华达科捷光电仪器有限公司 一种用于激光模组的控制电路及具有该控制电路的激光准直仪

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