WO2016161874A1 - 一种激光器驱动电路 - Google Patents

一种激光器驱动电路 Download PDF

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Publication number
WO2016161874A1
WO2016161874A1 PCT/CN2016/076322 CN2016076322W WO2016161874A1 WO 2016161874 A1 WO2016161874 A1 WO 2016161874A1 CN 2016076322 W CN2016076322 W CN 2016076322W WO 2016161874 A1 WO2016161874 A1 WO 2016161874A1
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Prior art keywords
resistor
electrically connected
circuit
voltage
thermistor
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PCT/CN2016/076322
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English (en)
French (fr)
Inventor
孙建华
郝志强
汪东
李强
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西安华科光电有限公司
孙建华
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Publication of WO2016161874A1 publication Critical patent/WO2016161874A1/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
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor

Definitions

  • the utility model belongs to the technical field of electronic circuits, and in particular relates to a laser driving circuit.
  • the APC driving circuit is used to control the stable operation of the laser (the laser light intensity feedback is fed back to the driving circuit by the PD or the added PD of the laser tube, and the driving circuit changes the current flowing through the laser diode to achieve a constant driving power of the laser output light. Circuit.
  • the prior art uses an APC driving circuit to drive a green laser diode. Due to its special manufacturing process, the green semiconductor laser diode has a large variation in operating voltage over its operating temperature range. From low to high temperatures, the laser tube voltage (which can be reduced from 9V to 5V) is reduced by 40%.
  • the voltage supplied to the APC driver circuit is a constant voltage. For example, it provides a 7V voltage operation.
  • the APC circuit works normally at normal temperature or high temperature.
  • the laser diode itself operates at a voltage exceeding 7V, and the APC driver circuit cannot provide an operating voltage exceeding 7V.
  • the laser tube is not working properly, the laser power will drop, and the stable output of the laser power cannot be achieved.
  • provide A drive power source that exceeds the maximum operating voltage of the laser tube, such as a 9V power supply, ensures that the green semiconductor laser tube can output a stable optical power through the APC circuit over the full temperature range.
  • the laser tube operating voltage is lowered at normal temperature or high temperature, and the excess voltage conversion power becomes reactive power (for heating), which will affect the life of the laser diode and its driving circuit components, and at the same time cause waste of electric energy.
  • the existing laser driving circuit has the defect that the output power is insufficient according to the ambient temperature, which easily affects the life of the driving circuit component and wastes power.
  • the purpose of the utility model is to overcome the defects that the existing laser driving circuit has insufficient output power adjustment according to the ambient temperature, which easily affects the life of the driving circuit component and wastes power.
  • the present invention provides a laser driving circuit comprising a sequentially connected battery, a DC-DC power conversion circuit, a driving circuit, a laser diode, and a voltage adjustment detecting circuit, the voltage regulating detecting circuit and the DC-
  • the DC power conversion circuit is electrically connected to detect the temperature of the laser diode and convert the temperature information into an electrical signal, which is fed back to the DC-DC power conversion circuit.
  • the voltage regulation detecting circuit comprises a resistor R2, a thermistor R25 and a resistor R3; the resistor R2 is connected to the output terminal of the DC-DC power conversion circuit VOUT, and the other end is electrically connected to one end of the thermistor R25, the thermistor R25 The other end is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to the ground.
  • the junction of the thermistor R25 and the resistor R3 is also electrically connected to the voltage feedback terminal FB of the DC-DC power conversion circuit.
  • the thermistor R25 described above is a negative temperature coefficient thermistor.
  • the voltage regulation detecting circuit may further be composed of a resistor R2, a thermistor R26, and a resistor R3; one end of the resistor R2 is electrically connected to the output terminal VOUT of the DC-DC power conversion circuit, and the other end is It is electrically connected to one end of the thermistor R26, the other end of the thermistor R26 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to the ground; the connection between the resistor R2 and the thermistor R26 is also DC- The voltage feedback terminal FB of the DC power conversion circuit is electrically connected.
  • the thermistor R26 is a positive temperature coefficient thermistor.
  • the laser driving circuit further includes a voltage conversion circuit for providing electrical energy that satisfies a working voltage of the voltage regulating detecting circuit; the voltage converting circuit includes a power converting chip U2, a capacitor C6; and a pin 1 of the power converting chip U2
  • the pin 5 is electrically connected to the output terminal VOUT of the DC-DC power conversion circuit, the pin 3 is electrically connected to the ground terminal, the pin 4 is the output terminal VOUT1, and the capacitor C6 is connected between the output terminal VOUT1 and the ground terminal.
  • the voltage regulation detection circuit includes a thermistor R21, a resistor R22, a resistor R23, a resistor R24, an MCU control chip U3, and a capacitor C21; one end of the thermistor R21 is electrically connected to the output terminal VOUT1 of the conversion circuit, and the other end passes through the resistor.
  • R23 is electrically connected to the ground terminal, and the connection between the resistor R21 and the resistor R23 is also electrically connected to the pin 3 of the MCU control chip U3.
  • One end of the resistor R24 is electrically connected to the output terminal VOUT of the DC-DC power conversion circuit, and the other end passes through the capacitor C21.
  • connection between the resistor R24 and the capacitor C21 is electrically connected to the pin 3 of the MCU control chip U3 through the resistor R22.
  • the resistor R24 and the capacitor C21 are also connected to the voltage feedback terminal FB of the DC-DC power conversion circuit. Electrical connection.
  • the laser driving circuit provided by the present invention comprises a sequentially connected battery, a DC-DC power conversion circuit, a driving circuit, a laser diode, and a voltage adjustment detecting circuit, and the voltage adjustment detecting
  • the circuit is electrically connected to the DC-DC power conversion circuit for detecting the temperature of the laser diode and converting the temperature information into an electrical signal, and feeding back to the DC-DC power conversion circuit; therefore, the laser driving circuit can adjust the output power according to the ambient temperature.
  • the temperature coefficient thermistor converts the laser diode temperature information into an electrical signal and directly feeds it back to the DC-DC power conversion circuit to adjust the output voltage, so that the circuit is simple, the adjustment efficiency is high, and the temperature of the laser diode can be adjusted in the first time.
  • the MCU control chip is used to process the collected temperature information, and then fed back to the DC-DC power conversion circuit, which can be set according to the working environment of the laser. Different parameters adjust the working voltage of the laser diode so that its output power can always be in an optimal state, and it can filter out the sudden change of the ambient temperature, causing the sudden change of the output voltage of the laser diode to affect its operation.
  • Figure 1 is a block diagram of the laser driver circuit.
  • FIG. 2 is a schematic diagram of electrical connection of a DC-DC power conversion circuit.
  • Fig. 3 is a circuit diagram showing a connection between a driving circuit and a laser diode.
  • Figure 4 is a circuit diagram of the second scheme of the driving circuit and the laser diode.
  • Figure 5 is a schematic diagram of a voltage regulation detection circuit.
  • FIG. 6 is a schematic diagram of a second scheme of a voltage regulation detection circuit.
  • Figure 7 is a schematic diagram of a third scheme of the voltage regulation detection circuit.
  • Fig. 8 is a circuit diagram of a voltage conversion circuit.
  • the DC-DC power converter is a very efficient power supply component.
  • this component has an FB (voltage feedback) pin to monitor the change of the output voltage. If the output voltage change feedback pin transmits a varying voltage signal to the chip, the chip adjusts the internal signal to stabilize the output voltage to the originally set voltage. If the temperature sensor is used to monitor the change of the working temperature of the laser, thereby adjusting the output voltage of the DC-DC; when the temperature rises, the output voltage of the DC-DC is lowered by changing the voltage signal of the FB; conversely, when the temperature is lowered, Increase the output voltage of the DC-DC.
  • FB voltage feedback
  • the present invention provides a laser driving circuit as shown in FIG. 1 , comprising a sequentially connected battery, a DC-DC power conversion circuit, a driving circuit, a laser diode, and a voltage adjustment detecting circuit,
  • the voltage adjustment detection circuit is electrically connected with the DC-DC power conversion circuit for detecting the temperature of the laser diode and converting the temperature information into an electrical signal, and feeding back to the DC-DC power conversion circuit, wherein the DC-DC power conversion circuit is as shown in FIG. 2
  • the driving circuit and the laser two connection circuit are shown in Fig.
  • the voltage adjustment detecting circuit includes a resistor R2, a thermistor R25, and a resistor R3.
  • One end of the resistor R2 is connected to the output terminal of the DC-DC power conversion circuit VOUT, and the other end is electrically connected to one end of the thermistor R25.
  • the other end of the thermistor R25 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 is electrically connected to the ground; the junction of the thermistor R25 and the resistor R3 is also connected with the voltage feedback end of the DC-DC power conversion circuit.
  • the laser diode temperature information is converted into an electric signal and directly fed back to the DC-DC power conversion circuit to adjust the output voltage, so that the circuit is simple, the adjustment efficiency is high, and the temperature of the laser diode can be adjusted at the first time to ensure the output power thereof. To reduce the effect of ambient temperature on the working efficiency of the laser diode.
  • the above embodiment adopts a thermistor with a negative temperature coefficient. If the voltage detecting circuit is converted as shown in FIG. 6, that is, the voltage detecting circuit is composed of a resistor R2, a thermistor R26, and a resistor R3, the above embodiment can also be realized. The function of adjusting the output voltage.
  • One end of the resistor R2 is electrically connected to the output end of the DC-DC power conversion circuit VOUT, the other end is electrically connected to one end of the thermistor R26, and the other end of the thermistor R26 is electrically connected to one end of the resistor R3, and the other end of the resistor R3 It is electrically connected to the ground terminal; the connection of the resistor R2 and the thermistor R26 is also electrically connected to the voltage feedback terminal FB of the DC-DC power conversion circuit.
  • the laser driving circuit provided in this embodiment further includes a voltage converting circuit for providing electric energy that satisfies the operating voltage of the voltage regulating detecting circuit.
  • the voltage converting circuit includes a power source.
  • the conversion chip U2 and the capacitor C6; the pin 1 and the pin 5 of the power conversion chip U2 are electrically connected to the output terminal VOUT of the DC-DC power conversion circuit, the pin 3 is electrically connected to the ground terminal, and the pin 4 is the output terminal.
  • VOUT1, capacitor C6 is connected between the output terminal VOUT1 and the ground.
  • the driving circuit and the laser two-connecting circuit described in this embodiment are as shown in FIG. 4, and the real-time feedback of the working environment temperature of the laser diode can be performed in the same manner, and the electric power is adjusted according to the temperature.
  • the source output voltage ensures that the laser works normally, achieves stable output of laser power, saves energy, and can well protect the driving circuit components and prolong the service life.
  • the voltage adjustment detection circuit is as shown in FIG. 7, and includes a thermistor R21, a resistor R22, a resistor R23, a resistor R24, an MCU control chip U3, and a capacitor C21; one end of the thermistor R21 and a conversion circuit output terminal VOUT1 Electrical connection, the other end is electrically connected to the ground through a resistor R23, the junction of the resistor R21 and the resistor R23 is also electrically connected to the pin 3 of the MCU control chip U3, and one end of the resistor R24 is electrically connected to the output of the DC-DC power conversion circuit VOUT The other end is electrically connected to the ground through the capacitor C21.
  • connection between the resistor R24 and the capacitor C21 is electrically connected to the pin 3 of the MCU control chip U3 through the resistor R22.
  • the resistor R24 and the capacitor C21 are also connected to the DC-DC power supply.
  • the voltage feedback terminal FB of the conversion circuit is electrically connected.
  • the thermistor R21 is not limited to which thermistor is used, and may even be replaced by a temperature sensor.
  • the temperature information of the laser diode is simply converted into an electrical signal, and after being converted, it is transmitted to the MCU control chip U3 through the MCU.
  • Control chip U3 determines the PWM signal or D/A signal that regulates the voltage, controls the feedback voltage signal received by the DC-DC power conversion circuit, thereby achieving the purpose of adjusting the operating voltage of the laser diode.
  • the sudden change in diode output voltage affects its operation.

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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

一种激光器驱动电路，包括顺次连接的电池、DC-DC电源转换电路、驱动电路、激光二极管，以及电压调节检测电路。电压调节检测电路与DC-DC电源转换电路电连接，用于检测激光二极管的温度并将温度信息转化为电信号，反馈到DC-DC电源转换电路。因此，激光器驱动电路能够根据环境温度调节输出功率，能够在低温或者高温时，根据实际的温度情况调节驱动电路的电压，确保激光器正常工作，实现激光功率的稳定输出，节省电能，而且能很好地保护驱动电路元器件，延长使用寿命。

Description

一种激光器驱动电路 技术领域
本实用新型属于电子电路技术领域，具体涉及一种激光器驱动电路。
背景技术
世界上第一台激光器诞生于1960年，我国于1961年研制出第一台激光器，40多年来，激光技术与应用发展迅猛，已与多个学科相结合形成多个应用技术领域，比如光电技术，激光医疗与光子生物学，激光加工技术，激光检测与计量技术，激光全息技术，激光光谱分析技术，非线性光学，超快激光学，激光化学，量子光学，激光雷达，激光制导，激光分离同位素，激光可控核聚变，激光武器等等。这些交叉技术与新的学科的出现，大大地推动了传统产业和新兴产业的发展。
控制激光器稳定工作使用的是APC驱动电路(利用激光管自带的PD或外加的PD将激光光强变化反馈给驱动电路，驱动电路改变流过激光二极管的电流来达到激光输出光功率恒定的驱动电路。
现有技术是用APC驱动电路驱动绿色激光二极管，绿色半导体激光二极管因其特殊的制作工艺，在其工作温度范围内，工作电压变化很大。从低温到高温，激光管电压(可以从9V降至5V)下降40％。
但是提供给APC驱动电路的电压为恒定电压，比如，提供7V电压工作，在常温或高温APC电路工作正常，但低温时，激光二极管自身工作电压超过7V，APC驱动电路无法提供超过7V的工作电压，激光管无法正常工作，激光器功率将下降，无法实现激光功率的稳定输出。再或者，提供 一个超过激光管最高工作电压的驱动电源，比如提供9V电源，可以保证绿光半导体激光管在全温度范围内通过APC电路都可以输出稳定的光功率。但在常温或高温时激光管工作电压降低，多余出来的电压转换的功率变成无功功率(用来发热)这将影响激光二极管及其驱动电路元器件的寿命，同时造成电能的浪费。
总之,现有激光器驱动电路存在着随环境温度调节输出功率不足的缺陷,容易影响驱动电路元器件的寿命,浪费电能的缺点。
实用新型内容
本实用新型的目的是克服现有激光器驱动电路存在随环境温度调节输出功率不足的缺陷,容易影响驱动电路元器件的寿命，浪费电能的问题。
为此，本实用新型提供了一种激光器驱动电路，包括顺次连接的电池,DC-DC电源转换电路，驱动电路，激光二极管，还包括电压调节检测电路，所述电压调节检测电路与DC-DC电源转换电路电连接，用于检测激光二极管的温度并将温度信息转化为电信号,反馈到DC-DC电源转换电路。
上述电压调节检测电路包括电阻R2，热敏电阻R25,电阻R3；所述电阻R2一端与DC-DC电源转换电路输出端VOUT连接，另一端与热敏电阻R25的一端电连接，热敏电阻R25的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；热敏电阻R25与电阻R3的连接处还与DC-DC电源转换电路的电压反馈端FB电连接。
上述热敏电阻R25是负温度系数热敏电阻。
上述电压调节检测电路还可以是由电阻R2，热敏电阻R26,电阻R3组成；所述电阻R2一端与DC-DC电源转换电路输出端VOUT电连接，另一端 与热敏电阻R26的一端电连接，热敏电阻R26的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；电阻R2与热敏电阻R26的连接处还与DC-DC电源转换电路的电压反馈端FB电连接。
所述热敏电阻R26是正温度系数热敏电阻。
所述的激光器驱动电路，还包括电压转换电路，用于提供满足电压调节检测电路工作电压的电能；所述电压转换电路包括电源转换芯片U2，电容C6；所述电源转换芯片U2的管脚1、管脚5均与DC-DC电源转换电路输出端VOUT电连接，管脚3与接地端电连接，管脚4为输出端VOUT1，电容C6连接在输出端VOUT1与接地端之间。
上述电压调节检测电路包括热敏电阻R21，电阻R22，电阻R23，电阻R24，MCU控制芯片U3，以及电容C21；所述热敏电阻R21的一端与转换电路输出端VOUT1电连接，另一端通过电阻R23与接地端电连接，电阻R21与电阻R23的连接处还与MCU控制芯片U3的管脚3电连接，电阻R24的一端与DC-DC电源转换电路输出端VOUT电连接，另一端通过电容C21与接地端电连接，所述电阻R24与电容C21的连接处通过电阻R22与MCU控制芯片U3的管脚3电连接，上述电阻R24与电容C21还与DC-DC电源转换电路的电压反馈端FB电连接。
本实用新型的有益效果：本实用新型提供的这种激光器驱动电路，包括顺次连接的电池,DC-DC电源转换电路，驱动电路,激光二极管，还包括电压调节检测电路，所述电压调节检测电路与DC-DC电源转换电路电连接，用于检测激光二极管的温度并将温度信息转化为电信号,反馈到DC-DC电源转换电路；因此，该激光器驱动电路，能够根据环境温度调节输出功率， 能够在低温或者高温时，根据实际的温度情况调节驱动电路的电压，确保激光器正常工作，实现激光功率的稳定输出，节省电能，而且能很好地保护驱动电路元器件，延长使用寿命；采用负温度系数热敏电阻将激光二极管温度信息转换为电信号直接反馈到DC-DC电源转换电路，对输出电压进行调节，这样电路简单，调节效率高，能够第一时间对激光二极管的温度做出调节，保证其输出功率，减小环境温度对激光二极管工作效率的影响；采用MCU控制芯片对采集的温度信息进行处理，然后反馈到DC-DC电源转换电路，可以根据激光器工作环境的不同，设定不同的参数，调节激光二极管的工作电压，使其输出功率能够一直处于最佳状态，而且能够滤除环境温度突变，引起激光二极管输出电压突变对其工作的影响。
以下将结合附图对本实用新型做进一步详细说明。
附图说明
图1是激光器驱动电路原理框图。
图2是DC-DC电源转换电路电连接示意图。
图3是驱动电路与激光二极管连接电路图。
图4驱动电路与激光二极管连接第二方案电路图。
图5是电压调节检测电路示意图。
图6是电压调节检测电路第二方案示意图。
图7电压调节检测电路第三方案示意图。
图8是电压转换电路图。
具体实施方式
为进一步阐述本实用新型达成预定目的所采取的技术手段及功效，以 下结合附图及实施例对本实用新型的具体实施方式、结构特征及其功效，详细说明如下。
实施例1：
DC-DC电源转换器是一种效率很高的电源元件，通常该元件有一个FB(电压反馈)管脚用来监视输出端电压的变化情况。如果输出电压变化反馈管脚将变化的电压信号传到芯片内，芯片会调节内部信号使得输出电压稳定到原来设定的电压。如果用温度传感器来监测激光器工作环境温度的变化，从而来调整DC-DC的输出电压；当温度升高，通过改变FB的电压信号，就降低DC-DC的输出电压；反之，当温度降低，增加DC-DC的输出电压。
根据此原理，本实用新型提供了一种如图1所示的激光器驱动电路，包括顺次连接的电池,DC-DC电源转换电路，驱动电路,激光二极管，还包括电压调节检测电路，所述电压调节检测电路与DC-DC电源转换电路电连接，用于检测激光二极管的温度并将温度信息转化为电信号,反馈到DC-DC电源转换电路，其中DC-DC电源转换电路如图2所示，驱动电路与激光二连接电路如图3所示；这样就可以对激光二极管的工作环境温度进行实时反馈，根据温度的不同调节电源输出电压，确保激光器正常工作，实现激光功率的稳定输出，节省电能，而且能很好地保护驱动电路元器件，延长使用寿命。
如图5所示，上述电压调节检测电路包括电阻R2，热敏电阻R25,电阻R3；所述电阻R2一端与DC-DC电源转换电路输出端VOUT连接，另一端与热敏电阻R25的一端电连接，热敏电阻R25的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；热敏电阻R25与电阻R3的连接处还与DC-DC电源转换电路的电压反馈端FB电连接；所使用的热敏电阻R25 是负温度系数热敏电阻(NTC热敏电阻)。
将激光二极管温度信息转换为电信号直接反馈到DC-DC电源转换电路，对输出电压进行调节，这样电路简单，调节效率高，能够第一时间对激光二极管的温度做出调节，保证其输出功率，减小环境温度对激光二极管工作效率的影响。
实施例2：
上述实施例采用的是负温度系数的热敏电阻，如果将电压检测电路转换为如图6所示，即电压检测电路由电阻R2，热敏电阻R26,电阻R3组成，同样可以实现上述实施例所述的调节输出电压的功能。
所述电阻R2一端与DC-DC电源转换电路输出端VOUT电连接，另一端与热敏电阻R26的一端电连接，热敏电阻R26的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；电阻R2与热敏电阻R26的连接处还与DC-DC电源转换电路的电压反馈端FB电连接。
实施例3：
与上述实施例1、2不同，本实施例提供的激光器驱动电路，还包括电压转换电路，用于提供满足电压调节检测电路工作电压的电能，如图8所示，所述电压转换电路包括电源转换芯片U2，电容C6；所述电源转换芯片U2的管脚1、管脚5均与DC-DC电源转换电路输出端VOUT电连接，管脚3与接地端电连接，管脚4为输出端VOUT1，电容C6连接在输出端VOUT1与接地端之间。
另外，本实施例所述的驱动电路与激光二连接电路如图4所示，同样可以对激光二极管的工作环境温度进行实时反馈，根据温度的不同调节电 源输出电压，确保激光器正常工作，实现激光功率的稳定输出，节省电能，而且能很好地保护驱动电路元器件，延长使用寿命。
所述电压调节检测电路如图7所示，包括热敏电阻R21，电阻R22，电阻R23，电阻R24，MCU控制芯片U3，以及电容C21；所述热敏电阻R21的一端与转换电路输出端VOUT1电连接，另一端通过电阻R23与接地端电连接，电阻R21与电阻R23的连接处还与MCU控制芯片U3的管脚3电连接，电阻R24的一端与DC-DC电源转换电路输出端VOUT电连接，另一端通过电容C21与接地端电连接，所述电阻R24与电容C21的连接处通过电阻R22与MCU控制芯片U3的管脚3电连接，上述电阻R24与电容C21还与DC-DC电源转换电路的电压反馈端FB电连接。
所述热敏电阻R21，不局限于使用何种热敏电阻，甚至可以替换为温度传感器，只需将激光二极管的温度信息转换为电信号，经过转换后，传送到MCU控制芯片U3，经过MCU控制芯片U3的判断，发出调节电压的PWM信号或D/A信号，控制DC-DC电源转换电路所收到的反馈电压信号，从而达到调节激光二极管的工作电压的目的，这种方案不仅可以实时调节激光二极管的工作电压，而且可以根据激光器工作环境的不同，设定不同的参数，调节激光二极管的工作电压，使其输出功率能够一直处于最佳状态，并且能够滤除环境温度突变，引起激光二极管输出电压突变对其工作的影响。
以上内容是结合具体的优选实施方式对本实用新型所作的进一步详细说明，不能认定本实用新型的具体实施只局限于这些说明。对于本实用新型所属技术领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本实用新型的保护范围。

Claims (7)

  1. 一种激光器驱动电路，包括顺次连接的电池,DC-DC电源转换电路，驱动电路,激光二极管，其特征在于：还包括电压调节检测电路，所述电压调节检测电路与DC-DC电源转换电路电连接，用于检测激光二极管的温度并将温度信息转化为电信号,反馈到DC-DC电源转换电路。
  2. 如权利要求1所述的激光器驱动电路，其特征在于：所述电压调节检测电路包括电阻R2，热敏电阻R25,电阻R3；所述电阻R2一端与DC-DC电源转换电路输出端VOUT电连接，另一端与热敏电阻R25的一端电连接，热敏电阻R25的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；热敏电阻R25与电阻R3的连接处还与DC-DC电源转换电路的电压反馈端FB电连接。
  3. 如权利要求2所述的激光器驱动电路，其特征在于：所述热敏电阻R25是负温度系数热敏电阻。
  4. 如权利要求1所述的激光器驱动电路，其特征在于：所述电压调节检测电路包括电阻R2，热敏电阻R26,电阻R3；所述电阻R2一端与DC-DC电源转换电路输出端VOUT电连接，另一端与热敏电阻R26的一端电连接，热敏电阻R26的另一端与电阻R3的一端电连接，电阻R3的另一端与接地端电连接；电阻R2与热敏电阻R26的连接处还与DC-DC电源转换电路的电压反馈端FB电连接。
  5. 如权利要求4所述的激光器驱动电路，其特征在于：所述热敏电阻R26是正温度系数热敏电阻。
  6. 如权利要求1所述的激光器驱动电路，其特征在于：还包括电压转换电路，用于提供满足电压调节检测电路工作电压的电能；所述电压转换 电路包括电源转换芯片U2，电容C6；所述电源转换芯片U2的管脚1、管脚5均与DC-DC电源转换电路输出端VOUT电连接，管脚3与接地端电连接，管脚4为输出端VOUT1，电容C6连接在输出端VOUT1与接地端之间。
  7. 如权利要求1或6所述的激光器驱动电路，其特征在于：所述电压调节检测电路包括热敏电阻R21，电阻R22，电阻R23，电阻R24，MCU控制芯片U3，以及电容C21；所述热敏电阻R21的一端与转换电路输出端VOUT1电连接，另一端通过电阻R23与接地端电连接，电阻R21与电阻R23的连接处还与MCU控制芯片U3的管脚3电连接，电阻R24的一端与DC-DC电源转换电路输出端VOUT电连接，另一端通过电容C21与接地端电连接，所述电阻R24与电容C21的连接处通过电阻R22与MCU控制芯片U3的管脚3电连接，上述电阻R24与电容C21还与DC-DC电源转换电路的电压反馈端FB电连接。
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