CN203690702U - Laser tube driving circuit for infrared sensor - Google Patents
Laser tube driving circuit for infrared sensor Download PDFInfo
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- CN203690702U CN203690702U CN201320704964.5U CN201320704964U CN203690702U CN 203690702 U CN203690702 U CN 203690702U CN 201320704964 U CN201320704964 U CN 201320704964U CN 203690702 U CN203690702 U CN 203690702U
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Abstract
Provided is a laser tube driving circuit for an infrared sensor. The laser tube driving circuit is composed of a driving chip, a pulse width control constant-current source circuit, a filtering circuit, a temperature detecting circuit, a temperature compensating circuit, a single-chip microcomputer, and a laser tube. The output signal end of the pulse width control constant-current source circuit is connected with the driving chip. The filtering circuit is mainly composed of a voltage-stabilizing circuit and a filtering network and provides stable supply voltage for the laser tube and the driving chip. The temperature of the laser tube is transmitted to the single-chip microcomputer through the temperature detecting circuit and the single-chip microcomputer supplies temperature compensation to the laser tube with the temperature compensating circuit. The driving chip adjusts the output power of a laser device by changing external resistance. Continuous adjustment can be performed on the output power of the laser device by an external adjustable current source. The laser tube driving circuit is simple in structure, stable in performance, high in adjusting precision, steady in power, capable of satisfying demands for stable optical power and continuous adjustment of the infrared sensor, and is large in application range.
Description
Technical field
The utility model relates to a kind of drive circuit for laser, especially a kind of infrared sensor laser tube drive circuit.
Background technology
Transducer uses monochromaticjty laser tube good, that volume is little, operating voltage is low to provide array multispectral, and the stability of luminous power is directly connected to certainty of measurement and the measuring range of instrument, is the key factor that affects instrument performance quality.At present, the shortcomings such as the current response rate power slow, have certain bright dipping time delay, drive circuit complexity, laser tube after laser tube after amplifying is unstable when low, the input pulse signal of ubiquity constant current accuracy in the laser tube drive circuit of constant current laser pump source or the pulse power.
Utility model content
For the power of stabilized lasers pipe, the utility model provides a kind of laser tube drive circuit of infrared sensor, and drive circuit is by driving chip, pulse width control constant-current source circuit, filter circuit, temperature sensing circuit, temperature-compensation circuit, single-chip microcomputer and laser tube to form; The model of described driving chip, for driving chip iC-WKN, drives chip iC-WKN to have the first monitoring pin and the second monitoring pin; The output pin of single-chip microcomputer connects pulse width control constant-current source circuit, the output of pulse width control constant-current source circuit connects driving chip iC-WKN first and monitors pin, the output of filter circuit connects respectively the high level input and the laser tube high level input that drive chip iC-WKN, and laser tube connects the second monitoring pin that drives chip iC-WKN; Laser tube connects temperature sensing circuit, and temperature sensing circuit output connects the input pin of single-chip microcomputer, and the output pin of single-chip microcomputer connects temperature-compensation circuit.
Preferably, pulse width control constant-current source circuit contains pliotron, two-stage calculation amplifier and resistive element, the in-phase input end of first order operational amplifier connects the output pin of single-chip microcomputer, the output of first order operational amplifier connects the in-phase input end of second level operational amplifier, the inverting input of second level operational amplifier connects the emitter of pliotron, the emitter resistance grounded of pliotron, the output of second level operational amplifier connects the base stage of pliotron, the collector electrode of pliotron connects driving chip iC-WKN current monitoring pin.
Preferably, filtered electrical routing regulator circuit and filter network composition.
Preferably, temperature-compensation circuit is made up of field effect transistor, diode and heating resistor, and the drain electrode of field effect transistor connects high level, and the source electrode of field effect transistor is through heating resistor ground connection in parallel, the grid of field effect transistor connects the anode of diode through resistance, the negative electrode of diode connects the output of single-chip microcomputer.
Preferably, temperature sensing circuit contains thermistor.
The beneficial effects of the utility model:
Adopt and drive chip iC-WKN, utilize laser tube light feedback current to adjust output power, improve the stability of laser tube power output.
Temperature sensing circuit matches with temperature-compensation circuit and can automatically adjust laser tube working temperature, and it is operated in certain temperature range, reduces the impact of variation of ambient temperature on laser tube power output.
Filter circuit is for laser tube and drive chip that the burning voltage that ripple coefficient is little is provided, and has guaranteed the stability of laser tube power output.
That this circuit has is simple in structure, stable performance, adjustment precision are high, the feature of power stability, can meet infrared sensor to light power stabilising performance and continuously adjustable requirement, applied range.
Accompanying drawing explanation
Fig. 1 is the laser tube drive circuit schematic diagram of infrared sensor.
Fig. 2 is pulse width control constant-current source circuit.
Fig. 3 is temperature-compensation circuit.
Embodiment
1 to 3 pair of specific embodiment of the utility model is described further by reference to the accompanying drawings:
A laser tube drive circuit for infrared sensor, drive circuit is by driving chip, pulse width control constant-current source circuit, filter circuit, temperature sensing circuit, temperature-compensation circuit, single-chip microcomputer and laser tube to form; The model of described driving chip, for driving chip iC-WKN, drives chip iC-WKN to have the first monitoring pin MDK and the second monitoring pin MDA; The output pin of single-chip microcomputer connects pulse width control constant-current source circuit, the output of pulse width control constant-current source circuit connects driving chip iC-WKN first and monitors pin MDK, the output of filter circuit connects respectively the high level input and the laser tube high level input that drive chip iC-WKN, and laser tube connects the second monitoring pin MDA that drives chip iC-WKN; Laser tube connects temperature sensing circuit, and temperature sensing circuit output connects the input pin of single-chip microcomputer, and the output pin of single-chip microcomputer connects temperature-compensation circuit.
In the time that laser tube power changes, the electric current of the second monitoring pin MDA of iC-WKN chip can change, cause that internal arithmetic amplifier output voltage changes, thereby affect the base current of inner triode, again by driving chip that the operating current of laser tube is changed, until laser tube power output is got back to original numerical value.IC-WKN chip, by regulating current source to carry out continuous modulation to the power output of laser, also can utilize outside can change the power output of non-essential resistance adjusting laser.
Pulse width control constant-current source circuit contains pliotron, two-stage calculation amplifier and resistance, the in-phase input end of first order operational amplifier 201 connects the output pin 1 of single-chip microcomputer, the output of first order operational amplifier 201 connects the in-phase input end of second level operational amplifier 202, the inverting input of second level operational amplifier 202 connects the emitter of pliotron 203, the emitter of pliotron is through resistance 204 ground connection, the output of second level operational amplifier connects the base stage of pliotron, the collector electrode 2 of pliotron connects driving chip iC-WKN first and monitors pin MDK.First order operational amplifier is realized the filtering conversion of the pulse-width signal to single-chip microcomputer output, and pliotron 203, second level operational amplifier 202, pliotron 203 and resistance 204 are realized constant current control.
Pulse width control constant-current source circuit utilizes PWM pulse-width modulation to change single-chip microcomputer output duty cycle.The control signal that the output pin 1 of single-chip microcomputer is exported changes through 201 filtering of the first order operational amplifier d. c. voltage signal U0 becoming with the linear proportional relationship of duty ratio, according to the short characteristic U1=U2=U0 of void of operational amplifier, in the time that direct voltage U0 changes, the curent change at sampling resistor 204 two ends, the electric current at resistance 204 two ends approximates the monitor current that drives chip iC-WKN first to monitor pin MDK.Change and drive chip iC-WKN first to monitor the electric current of pin MDK by the voltage at change resistance 204 two ends, thereby the power output of laser tube is carried out to continuous regulation and control.
Filtered electrical routing regulator circuit and filter network composition, for laser tube and drive chip that the burning voltage that ripple coefficient is little is provided, has guaranteed the stability of laser tube power output.
Temperature-compensation circuit is made up of field effect transistor 301, diode 302, heating resistor 303 and heating resistor 304, the drain electrode of field effect transistor 301 connects high level, the source electrode of field effect transistor is through heating resistor in parallel 303 and heating resistor 304 ground connection, the grid of field effect transistor connects the anode of diode 302 through resistance, the negative electrode of diode connects the output 3 of single-chip microcomputer.Temperature sensing circuit contains thermistor.The laser tube temperature height induced signal by thermistor is to single-chip microcomputer, then by single-chip microcomputer by temperature-compensation circuit to laser tube compensation temperature.Circuit function: the temperature of thermistor induction is normal, and the output 3 of single-chip microcomputer is exported high level, and diode 302 ends, and field effect transistor 301 is ended, and heating resistor 303, heating resistor 304 no currents, do not heat; The temperature of thermistor induction is too low, output 3 output low levels of single-chip microcomputer, and diode 302 conductings, field effect transistor 301 conductings, heating resistor 303, heating resistor 304 have electric current, heating resistor heating, heating laser tube.According to the setting of single-chip microcomputer, when laser tube temperature is during higher than 20 ℃, do not heat; When laser tube temperature is during lower than 20 ℃, stable in order to guarantee laser tube temperature, the difference according to observed temperature with 20 ℃, carries out ladder adjustment to heating power, the power stability of maintenance laser tube.
Certainly; more than explanation is only preferred embodiment of the present utility model; the utility model is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the guidance of this specification; that makes is allly equal to alternative, obvious variant, within all dropping on the essential scope of this specification, ought to be subject to protection of the present utility model.
Claims (5)
1. a laser tube drive circuit for infrared sensor, is characterized in that: drive circuit is by driving chip, pulse width control constant-current source circuit, filter circuit, temperature sensing circuit, temperature-compensation circuit, single-chip microcomputer and laser tube to form;
The model of described driving chip, for driving chip iC-WKN, drives chip iC-WKN to have the first monitoring pin and the second monitoring pin;
The output pin of single-chip microcomputer connects pulse width control constant-current source circuit, the output of pulse width control constant-current source circuit connects driving chip iC-WKN first and monitors pin, the output of filter circuit connects respectively the high level input and the laser tube high level input that drive chip iC-WKN, and laser tube connects the second monitoring pin that drives chip iC-WKN;
Laser tube connects temperature sensing circuit, and temperature sensing circuit output connects the input pin of single-chip microcomputer, and the output pin of single-chip microcomputer connects temperature-compensation circuit.
2. the laser tube drive circuit of a kind of infrared sensor according to claim 1, it is characterized in that: described pulse width control constant-current source circuit contains pliotron, two-stage calculation amplifier and resistive element, the in-phase input end of first order operational amplifier connects the output pin of single-chip microcomputer, the output of first order operational amplifier connects the in-phase input end of second level operational amplifier, the inverting input of second level operational amplifier connects the emitter of pliotron, the emitter resistance grounded of pliotron, the output of second level operational amplifier connects the base stage of pliotron, the collector electrode of pliotron connects driving chip iC-WKN current monitoring pin.
3. the laser tube drive circuit of a kind of infrared sensor according to claim 1, is characterized in that: described filtered electrical routing regulator circuit and filter network composition.
4. the laser tube drive circuit of a kind of infrared sensor according to claim 1, it is characterized in that: described temperature-compensation circuit is made up of field effect transistor, diode and heating resistor, the drain electrode of field effect transistor connects high level, the source electrode of field effect transistor is through heating resistor ground connection in parallel, the grid of field effect transistor connects the anode of diode through resistance, the negative electrode of diode connects the output of single-chip microcomputer.
5. the laser tube drive circuit of a kind of infrared sensor according to claim 1, is characterized in that: described temperature sensing circuit contains thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704964.5U CN203690702U (en) | 2013-11-08 | 2013-11-08 | Laser tube driving circuit for infrared sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704964.5U CN203690702U (en) | 2013-11-08 | 2013-11-08 | Laser tube driving circuit for infrared sensor |
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| Publication Number | Publication Date |
|---|---|
| CN203690702U true CN203690702U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320704964.5U Expired - Fee Related CN203690702U (en) | 2013-11-08 | 2013-11-08 | Laser tube driving circuit for infrared sensor |
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| Country | Link |
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| CN (1) | CN203690702U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106129790A (en) * | 2016-09-05 | 2016-11-16 | 吉林大学 | A kind of digital laser pumping source |
| CN106851928A (en) * | 2015-12-04 | 2017-06-13 | 北京计算机技术及应用研究所 | A kind of detection means for light source driving circuit |
| CN113794190A (en) * | 2021-09-18 | 2021-12-14 | 深圳市汇元自动化技术有限公司 | Cloth identification circuit and device using three-eye infrared sensor |
-
2013
- 2013-11-08 CN CN201320704964.5U patent/CN203690702U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106851928A (en) * | 2015-12-04 | 2017-06-13 | 北京计算机技术及应用研究所 | A kind of detection means for light source driving circuit |
| CN106129790A (en) * | 2016-09-05 | 2016-11-16 | 吉林大学 | A kind of digital laser pumping source |
| CN106129790B (en) * | 2016-09-05 | 2019-06-07 | 吉林大学 | A kind of digital laser pumping source |
| CN113794190A (en) * | 2021-09-18 | 2021-12-14 | 深圳市汇元自动化技术有限公司 | Cloth identification circuit and device using three-eye infrared sensor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20141108 |
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| EXPY | Termination of patent right or utility model |