WO2016169378A1 - 一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪 - Google Patents

一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪 Download PDF

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Publication number
WO2016169378A1
WO2016169378A1 PCT/CN2016/077098 CN2016077098W WO2016169378A1 WO 2016169378 A1 WO2016169378 A1 WO 2016169378A1 CN 2016077098 W CN2016077098 W CN 2016077098W WO 2016169378 A1 WO2016169378 A1 WO 2016169378A1
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Prior art keywords
transistor
parallel
resistor
circuit
laser
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PCT/CN2016/077098
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English (en)
French (fr)
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张瓯
傅俊杰
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张瓯
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Priority claimed from CN201520249815.3U external-priority patent/CN204696446U/zh
Priority claimed from CN201510195259.0A external-priority patent/CN104852277B/zh
Application filed by 张瓯 filed Critical 张瓯
Publication of WO2016169378A1 publication Critical patent/WO2016169378A1/zh

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    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/42—Arrays of surface emitting lasers

Definitions

  • the invention relates to the field of photoelectric instruments, in particular to a driving circuit for a laser module and a laser line finder having the same.
  • the laser emitted by the laser operates in a real-time pulse state and is controlled by a control circuit of the main board portion to control the pulse frequency within a fixed range.
  • the peak of the pulse waveform is large, and the sudden large current is likely to cause damage to the laser module, which seriously affects the service life of the product.
  • an object of the present invention is to provide a driving circuit for a laser module and a laser line finder having the same, which can effectively suppress spikes of a pulse waveform.
  • the invention discloses a driving circuit for a laser module, comprising: a semiconductor laser LD for emitting laser light; a photodiode PD for converting an external optical signal into an electrical signal; and an RC parallel circuit connected with the photodiode PD Limiting current in the driving circuit; a first transistor Q1 and a second transistor Q2, wherein a base of the first transistor Q1 is connected to the RC parallel circuit, the first three poles The emitter of the tube Q1 is grounded, the collector of the first transistor Q1 is connected to the base of the second transistor Q2; the emitter of the second transistor Q2 is grounded, the second three The collector of the pole tube Q2 is connected to the semiconductor laser LD; and an RC series circuit is connected between the photodiode PD and the ground.
  • a resistor R1 and a capacitor C1 are connected in parallel between the collector of the second transistor Q2 and the semiconductor laser PD.
  • the RC series circuit includes: a resistor R2 and a capacitor C2; the resistor R2 is connected in parallel between the photodiode PD and a base of the second transistor Q2; the capacitor C2 is connected in parallel with the first The base of the two transistor Q2 is between the ground and the ground.
  • the RC parallel circuit comprises: a resistor R3 and a capacitor C3; the resistor R3 and the capacitor C3 are connected in parallel between the base of the first transistor Q1 and the ground.
  • the RC parallel circuit further includes a sliding rheostat Rp in series with the resistor R3.
  • a resistor R4 is connected between the emitter of the first transistor Q1 and the ground.
  • the invention also discloses a laser line finder comprising the above-mentioned driving circuit.
  • FIG. 1 is a schematic view of a pulse waveform having a peak in the prior art
  • FIG. 2 is a circuit diagram of a driving circuit in accordance with a preferred embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a pulse waveform in accordance with a preferred embodiment of the present invention.
  • the drive circuit includes the following components:
  • a semiconductor laser LD that emits a pulsed laser such as green light, red light, or the like by receiving a pulse signal
  • a photodiode PD converting an external optical signal into an electrical signal, and transmitting an electrical signal to the semiconductor laser PD through the driving circuit
  • - RC parallel circuit connected to the photodiode PD, can be used to limit the current flowing out of the photodiode PD, and firstly limit the energy of the output current of the photodiode PD;
  • the first transistor Q1 and the second transistor Q2 respectively perform signal conversion on the current in the driving circuit, wherein the connection manner of the first transistor Q1 and the second transistor Q2 is:
  • the base of the first transistor Q1 is connected to the RC parallel circuit, the transmitter is grounded, and the collector is connected to the base of the second transistor Q2;
  • the transmitter of the second transistor Q2 is also grounded, and its collector is connected to the semiconductor laser LD.
  • the RC series circuit is connected between the photodiode PD and the ground to filter the current amplified by the first transistor Q1 and the second transistor Q2 to eliminate spikes on the waveform.
  • the RC series circuit includes: a resistor R2 and a capacitor C2, wherein:
  • the resistor R2 is connected in parallel between the photodiode PD and the base of the second transistor Q2, and the end of the capacitor C2 It is connected to the base of the second transistor Q2 and the other end is grounded.
  • the size of the resistor R2 and the capacitor C2 are adjusted to change the total impedance between the first transistor Q1 and the second transistor Q2, and the capacitor C2 can absorb excess energy between the first transistor Q1 and the second transistor Q2. To control the waveform spikes.
  • the RC parallel circuit includes a resistor R3 and a capacitor C3, wherein:
  • resistor R3 and the capacitor C3 are respectively connected to the base of the first transistor Q1, and the other end is grounded. Changing the size of the resistor R3 and the capacitor C3 can change the total impedance between the photodiode PD and the first transistor Q1. , thereby controlling the current limiting effect of the RC parallel circuit on the current.
  • the RC parallel circuit further includes a sliding rheostat Rp, which is connected in series with the resistor R3 to change the resistance of the "resistor" in the RC parallel circuit, so that the user can change the total impedance of the RC parallel circuit.
  • a sliding rheostat Rp which is connected in series with the resistor R3 to change the resistance of the "resistor” in the RC parallel circuit, so that the user can change the total impedance of the RC parallel circuit.
  • a resistor R4 is also connected between the emitter of the first transistor Q1 and the ground to prevent excessive current breakdown.
  • the drive circuit can be directly applied to the laser line projector. Since the sudden high current is no longer generated, the use of the laser line projector is safer and its service life will be increased accordingly.

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

Abstract

一种用于激光模组的驱动电路，包括：半导体激光器（LD），用于发射激光；光电二极管（PD），将外部光信号转换为电信号；RC并联电路，与光电二极管（PD）连接，限制驱动电路内的电流；第一三极管（Q1）和第二三极管（Q2），其中第一三极管（Q1）的基极与RC并联电路连接，第一三级管（Q1）的发射极接地，第一三极管（Q1）的集电极与第二三极管（Q2）的基极连接；第二三极管（Q2）的发射极接地，第二三极管（Q2）的集电极与半导体激光器（LD）连接；RC串联电路，连接于光电二极管（PD）与地之间。具有这种驱动电路的激光模组，尤其是绿光模组的光电仪器可有效抑制脉冲波长的尖峰。

Description

一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪 技术领域
本发明涉及光电仪器领域，尤其涉及一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪。
技术背景
激光器所发射出的激光，是工作在实时的脉冲状态，并通过主板部分的控制电路，将该脉冲频率控制在一个固定范围内。
参阅图1，现有的用于激光模组的驱动电路中，其脉冲波形的尖峰较大，突然产生的大电流容易对激光模组产生损坏，严重影响产品的使用寿命。
因此，需要一种新型的用于激光模组的驱动电路，可消除脉冲波形中产生的尖峰，提高产品的使用寿命。
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驱动电路及具有该驱动电路的激光投线仪，可有效抑制脉冲波形的尖峰。
本发明公开了一种用于激光模组的驱动电路，包括：半导体激光器LD，用于发射激光；光电二极管PD，将外部光信号转换为电信号；RC并联电路，与所述光电二极管PD连接，限制所述驱动电路内的电流；第一三极管Q1和第二三极管Q2，其中所述第一三极管Q1的基极与所述RC并联电路连接，所述第一三极管Q1的发射极接地，所述第一三极管Q1的集电极与所述第二三极管Q2的基极连接；所述第二三极管Q2的发射极接地，所述第二三 极管Q2的集电极与所述半导体激光器LD连接；RC串联电路，连接于所述光电二极管PD与地间。
优选地，所述第二三极管Q2的集电极与所述半导体激光器PD间并联有一电阻R1和电容C1。
优选地，所述RC串联电路包括：电阻R2和电容C2；所述电阻R2并联于所述光电二极管PD与所述第二三极管Q2的基极间；所述电容C2并联于所述第二三极管Q2的基极与地间。
优选地，所述RC并联电路包括：电阻R3和电容C3；所述电阻R3和电容C3并联于所述第一三极管Q1的基极与地间。
优选地，所述RC并联电路还包括一滑动变阻器Rp，与所述电阻R3串联。
优选地，所述第一三极管Q1的发射极与地间连接有一电阻R4。
本发明还公开了一种激光投线仪，包括上述的驱动电路。
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.电路结构简单；
2.可有效消除光电仪器产生的脉冲波形的尖峰。
附图说明
图1为现有技术中具有尖峰的脉冲波形的示意图；
图2为符合本发明一优选实施例的驱动电路的电路示意图；
图3为符合本发明一优选实施例的脉冲波形的示意图。
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2，一优选实施例中，驱动电路包括以下部件：
-半导体激光器LD，通过接收脉冲信号发出脉冲状态的激光如绿光、红光等；
-光电二极管PD，将外部光信号转换为电信号，并通过驱动电路发送电信号至半导体激光器PD；
-RC并联电路，与光电二极管PD连接，可用于限制自光电二极管PD流出的电流大小，先行对光电二极管PD的输出电流进行能量限制；
-第一三极管Q1和第二三极管Q2，分别对驱动电路内的电流进行信号转化，其中第一三极管Q1和第二三极管Q2的连接方式为：
第一三极管Q1的基极与RC并联电路连接，其发射机接地，其集电极与第二三极管Q2的基极连接；
第二三极管Q2的发射机同样接地，而其集电极与半导体激光器LD连接。
-RC串联电路，连接在光电二极管PD与地间，对经由第一三极管Q1和第二三极管Q2放大的电流进行滤波，消除波形上的尖峰。
可选或优选地，在图2所示优选实施例中，还包括有以下部件：
-另一RC并联电路，包括有一电阻R1和电容C1，分别并联在第二三极管Q2的集电极和半导体激光器PD间，对自第二三极管Q2流至半导体激光器LD的电流进行限流，对驱动电路内的电流最大值进行限定；
此外，RC串联电路包括有：电阻R2和电容C2，其中：
电阻R2并联在光电二极管PD与第二三极管Q2的基极间，电容C2一端 与第二三极管Q2的基极连接，另一端接地。调整电阻R2和电容C2的大小，以改变第一三极管Q1和第二三极管Q2间的总阻抗，电容C2可吸收第一三极管Q1和第二三极管Q2间多余的能量，从而控制波形尖峰。
RC并联电路包括有电阻R3和电容C3，其中：
电阻R3和电容C3的一端分别与第一三极管Q1的基极连接，另一端均接地，改变电阻R3和电容C3的大小便可改变光电二极管PD和第一三极管Q1间的总阻抗，从而控制该RC并联电路对电流的限流作用。
优选地，RC并联电路还包括滑动变阻器Rp，与电阻R3串联，改变RC并联电路中“电阻”的阻值，方便使用者改变RC并联电路的总阻抗。
第一三极管Q1的发射极与地间还连接有一电阻R4，以防止过大的电流击穿。
具有上述实施例中的驱动电路后，RC并联和RC串联电路将吸收电路中多余的能量，参阅图2，与图1现有技术中的波形图相比，尖峰已明显消除。
该驱动电路可直接应用至激光投线仪中，由于不再会产生突发的大电流，激光投线仪的使用更加安全，其使用寿命也将相应增加。
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 (7)

  1. 一种用于激光模组的驱动电路，包括：
    半导体激光器LD，用于发射激光；
    光电二极管PD，将外部光信号转换为电信号；
    RC并联电路，与所述光电二极管PD连接，限制所述驱动电路内的电流；
    第一三极管Q1和第二三极管Q2，其中
    所述第一三极管Q1的基极与所述RC并联电路连接，所述第一三极管Q1的发射极接地，所述第一三极管Q1的集电极与所述第二三极管Q2的基极连接；
    所述第二三极管Q2的发射极接地，所述第二三极管Q2的集电极与所述半导体激光器LD连接；
    RC串联电路，连接于所述光电二极管PD与地间。
  2. 如权利要求1所述的驱动电路，其特征在于，
    所述第二三极管Q2的集电极与所述半导体激光器PD间并联有一电阻R1和电容C1。
  3. 如权利要求1所述的驱动电路，其特征在于，
    所述RC串联电路包括：电阻R2和电容C2；
    所述电阻R2并联于所述光电二极管PD与所述第二三极管Q2的基极间；
    所述电容C2并联于所述第二三极管Q2的基极与地间。
  4. 如权利要求1所述的驱动电路，其特征在于，
    所述RC并联电路包括：电阻R3和电容C3；
    所述电阻R3和电容C3并联于所述第一三极管Q1的基极与地间。
  5. 如权利要求4所述的驱动电路，其特征在于，
    所述RC并联电路还包括一滑动变阻器Rp，与所述电阻R3串联。
  6. 如权利要求1所述的驱动电路，其特征在于，
    所述第一三极管Q1的发射极与地间连接有一电阻R4。
  7. 一种激光投线仪，其特征在于，包括如权利要求1-6任一项所述的驱动电路。
PCT/CN2016/077098 2015-04-22 2016-03-23 一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪 WO2016169378A1 (zh)

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CN201520249815.3U CN204696446U (zh) 2015-04-22 2015-04-22 一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪
CN201520249815.3 2015-04-22
CN201510195259.0 2015-04-22
CN201510195259.0A CN104852277B (zh) 2015-04-22 2015-04-22 一种用于激光模组的驱动电路及具有该驱动电路的激光投线仪

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