CN209592617U - A kind of level meter mode of laser group driving circuit - Google Patents
A kind of level meter mode of laser group driving circuit Download PDFInfo
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- CN209592617U CN209592617U CN201920607187.XU CN201920607187U CN209592617U CN 209592617 U CN209592617 U CN 209592617U CN 201920607187 U CN201920607187 U CN 201920607187U CN 209592617 U CN209592617 U CN 209592617U
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- resistance
- laser tube
- chip microcontroller
- laser
- mos switch
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Abstract
The utility model discloses a kind of level meter mode of laser group driving circuits.In the circuit, thermistor monitors environment temperature.Single-chip microcontroller is with fixed frequency 100kHZ, 50% duty ratio drives MOS switch conducting, laser tube conducting, then, PT signal on monolithic machine testing feedback resistance, if signal is high level, think normal luminous, if laser tube is broken or since low temperature causes to start, preferential single-chip microcontroller is with 100kHZ, 100% duty ratio driving MOS switch simultaneously continues 1S, increase the driving energy of laser tube, this when, feedback resistance became high level, it drives successfully, restore 50% duty ratio after 1S, if within 1S, feedback resistance or low level, then think that laser tube has broken down.Under high-temperature condition, fixed 100kHZ, 50% duty ratio controls the energy of laser tube, solves high temperature damaged condition.The utility model solves the problem of traditional circuit photodiode and irregular, the laser tube high temperature easy burn-out of laser tube work, can not start under low temperature.
Description
Technical field
The utility model relates to a kind of level meter mode of laser group driving circuits.
Background technique
Laser leveler is widely used in the fields such as building, house ornamentation, road and bridge construction as a kind of measuring instrument.It uses
When, the laser tube in level meter, which needs to drive by driving circuit, to shine.
Traditional level meter mode of laser group driving circuit as shown in Figure 1, its working principle is that: external power supply VDD is entire
Circuit provides 3-3.5V input voltage, and triode Q1 is driven by power vd D by resistance R1, triode Q1 conducting, 808nm laser
Pipe D2 work.Photodiode D1 receives the light of laser tube D2 sending, reversed photoelectric current is begun with, when electric current is on resistance R2
When the voltage of generation is sufficiently large, triode Q2 conducting, triode Q1 ends, and laser tube D2 stops working.Triode Q1 and three poles
Pipe Q2 takes turns to operate, and protects laser tube D2, prevents its overcurrent from burning (C1 is power input filter capacitor).
The problem of conventional driving circuit, is: its working condition that laser tube is adjusted by the amplification performance of triode, root
Laser tube current is detected according to photodiode, to judge the working condition of laser tube, and by triode voluntarily adjustment circuit.But
It is that (1) since triode amplification factor is big, circuit consistency is widely different, leads to irregular, the Jin Erying of photodiode work
Ring the service life of laser tube；(2) due to the otherness of triode and linear cell relation, cause laser tube work irregular；(3) traditional
Circuit cannot adjust in due course according to external high and low temperature environment, easily lead to and burn laser tube under hot environment, and under low temperature environment not
The problem of laser tube can be started, (is based on laser characteristics, at low temperature, laser internal molecule is inactive, and driving is difficult, needs big
Energy driving can just shine).
Summary of the invention
To solve the problems, such as to point out in background technique, the utility model provides a kind of level meter mode of laser group driving circuit.
The technical solution adopted in the utility model is as follows:
A kind of level meter mode of laser group driving circuit, including single-chip microcontroller U1, thermistor R6A, power input filter capacitor
C1, driving resistance R3, discharge resistance R4, MOS switch Q1, current-limiting resistance R1, laser tube D2, photodiode D1 and feedback resistance
R5, wherein single-chip microcontroller U1 model HX30M1；
The one end thermistor R6A ground connection, the other end are connected with the pin 7 of single-chip microcontroller U1；Power input filter capacitor C1 mono-
End is connected with the pin 5 of single-chip microcontroller U1, capacitor C1 other end ground connection；
Driving the one end resistance R3 be connected respectively with the pin 2 of single-chip microcontroller U1 and pin 3, drive the resistance R3 other end respectively with
Discharge resistance R4 is connected with the grid of MOS switch Q1, and the source electrode of discharge resistance R4 and MOS switch Q1 are grounded respectively, MOS switch Q1
Drain electrode connect current-limiting resistance R1, current-limiting resistance R1 connection laser tube D2 cathode, laser tube D2 anode and photodiode D1 are born
Extremely it is connected, photodiode D1 anode and the one end feedback resistance R5 are connected with the pin 6 of single-chip microcontroller U1 respectively, and feedback resistance R5 is another
One end ground connection；
The pin 4 of single-chip microcontroller U1 is grounded, and laser tube D2 anode and photodiode D1 cathode are separately connected power supply.
Further, the supply voltage is 3-3.5V, and laser tube D2 is 808nm laser tube, power input filter capacitor
The capacitance of C1 is 100PF, and the resistance value of driving resistance R3 is 10 ohm, MOS switch Q1 model 2N7002K, discharge resistance R4
Resistance value be 10000 ohm, the resistance value of current-limiting resistance R1 is 100 ohm, and the resistance value of feedback resistance R5 is 1000 ohm.
Compared with the existing technology, the utility model has the beneficial effects that:
The electric current of photodiode D1 can be accurately calculated by single-chip microcontroller U1, and circuit is adjusted in due course, make to swash
Light pipe D2 is worked always with fixed frequency, can effectively extend the service life of laser tube D2.In addition, also being detected by thermistor R6A
Environment temperature reduces driving energy under high temperature, increases driving energy under low temperature, when laser tube D2 is working properly, restores normal
The problem of driving energy is solved and is easily burnt under hot environment, cannot start under low temperature environment.
Detailed description of the invention
Fig. 1 is conventional levels mode of laser group driver circuit schematic diagram；
Fig. 2 is the level meter mode of laser group driver circuit schematic diagram of the utility model；
Fig. 3 is the work flow diagram of the driving circuit of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
All other embodiment obtained, fall within the protection scope of the utility model.
Level meter mode of laser group driving circuit figure as shown in Figure 2, including single-chip microcontroller U1, thermistor R6A, power input
Filter capacitor C1, driving resistance R3, discharge resistance R4, MOS switch Q1, current-limiting resistance R1, laser tube D2, photodiode D1 and
Feedback resistance R5, wherein single-chip microcontroller U1 model HX30M1.
The pin 1 of thermistor R6A is grounded, and the pin 16 of thermistor R6A is connected with the pin 7 of single-chip microcontroller U1.Power supply
The one end input filter capacitor C1 is connected with the pin 5 of single-chip microcontroller U1, capacitor C1 other end ground connection.
Driving the one end resistance R3 be connected respectively with the pin 2 of single-chip microcontroller U1 and pin 3, drive the resistance R3 other end respectively with
Discharge resistance R4 is connected with the grid of MOS switch Q1, and the source electrode of discharge resistance R4 and MOS switch Q1 are grounded respectively, MOS switch Q1
Drain electrode connect current-limiting resistance R1, current-limiting resistance R1 connection laser tube D2 cathode, laser tube D2 anode and photodiode D1 are born
Extremely it is connected, photodiode D1 anode and the one end feedback resistance R5 are connected with the pin 6 of single-chip microcontroller U1 respectively, and feedback resistance R5 is another
One end ground connection.
The pin 4 of single-chip microcontroller U1 is grounded, and laser tube D2 anode and photodiode D1 cathode are separately connected power supply.
In the present embodiment, supply voltage 3-3.5V, laser tube D2 are 808nm laser tube, power input filter capacitor C1
Capacitance be 100PF, driving resistance R3 resistance value be 10 ohm, MOS switch Q1 model 2N7002K, discharge resistance R4's
Resistance value is 10000 ohm, and the resistance value of current-limiting resistance R1 is 100 ohm, and the resistance value of feedback resistance R5 is 1000 ohm.
The Pin description of single-chip microcontroller U1 is as shown in table 1.
Table 1
| Port name | Type | Function declaration |
| VDD | P | Power supply |
| GND | P | Ground |
| P10~P12 | D | GPIO, internal up/down are drawn |
| P14, P15 | D | GPIO, inside pull-up, includes 12 AD |
| P13 | D | Open-drain IO, inside pull-up |
The principle and workflow of the driving circuit of the utility model are as follows:
External power supply VDD provides 3-3.5V input voltage for entire circuit, and it is infrared strong to issue 808nm for laser tube D2 work
Light.Photodiode D1 receives the light of laser tube D2 sending, and reverse-conducting flows through electric current.MOS switch Q1 controls photosensitive two pole
The duty cycle of switching of pipe D1, R1 are the current-limiting resistances of laser tube D2, control maximum current, and R5 is the feedback electricity of photodiode D1
Resistance when photodiode D1 flows through electric current, voltage is generated on R5 and feeds back to single-chip microcontroller U1.R3 is the driving of MOS switch Q1
Resistance, R4 are the discharge resistances of MOS switch Q1.Single-chip microcontroller U1 is for controlling entire circuit, and R6A is thermistor, for monitoring
Environment temperature.When environment temperature is lower than 0 DEG C of setting value, laser tube D2 is not easy to drive, and the duty ratio of MOS switch Q1 increases by one
Times, increase driving capability, when PT signal transmitting photodiode D1 electric current reaches setting value 10mA, duty ratio restores normal,
When environment temperature is higher than 30 DEG C of setting value, the duty ratio of MOS switch Q1 reduces one times, reduces driving capability, when PT signal passes
When passing photodiode D1 electric current and reaching setting 10mA, duty ratio restores normal.
Specifically, after laser leveler booting, single-chip microcontroller U1 drives MOS with fixed frequency 100kHZ, 50% duty ratio
Switch Q1 conducting, laser tube D2 conducting, then, single-chip microcontroller U1 detects PT signal on feedback resistance R5, if signal is high level,
Think normal luminous, if laser tube D2 is broken or since low temperature causes to start, preferential single-chip microcontroller U1 with 100kHZ,
100% duty ratio driving MOS switch Q1 simultaneously continues 1S, increases the driving energy of laser tube D2, this when of feedback resistance R5 becomes
It at high level, drives successfully, restores 50% duty ratio after 1S, if within 1S, feedback resistance R5 or low level, then it is assumed that swash
Light pipe D2 has broken down.Under high-temperature condition, laser tube D2 is easy to turn on, and high temperature is easily damaged, so fixed 100kHZ, 50% is accounted for
Empty ratio controls the energy of laser tube D2, solves high temperature damaged condition.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. means
Particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one of the utility model
In embodiment or example.In the present specification, schematic expression of the above terms be not necessarily referring to identical embodiment or
Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more embodiment or examples
In can be combined in any suitable manner.
The preferred embodiment in the utility model disclosed above is only intended to help to illustrate the utility model.Preferred embodiment is simultaneously
There is no the details that detailed descriptionthe is all, also not limiting the utility model is only the specific embodiment.Obviously, according to this theory
The content of bright book can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to preferably
The principles of the present invention and practical application are explained, so that skilled artisan be enable to better understand and utilize this
Utility model.The utility model is limited only by the claims and their full scope and equivalents.
Claims (2)
1. a kind of level meter mode of laser group driving circuit, which is characterized in that including single-chip microcontroller U1, thermistor R6A, power input
Filter capacitor C1, driving resistance R3, discharge resistance R4, MOS switch Q1, current-limiting resistance R1, laser tube D2, photodiode D1 and
Feedback resistance R5, wherein single-chip microcontroller U1 model HX30M1；
The one end thermistor R6A ground connection, the other end are connected with the pin 7 of single-chip microcontroller U1；Power input one end filter capacitor C1 with
The pin 5 of single-chip microcontroller U1 is connected, capacitor C1 other end ground connection；
Driving the one end resistance R3 be connected respectively with the pin 2 of single-chip microcontroller U1 and pin 3, drive the resistance R3 other end respectively with electric discharge
Resistance R4 is connected with the grid of MOS switch Q1, and the source electrode of discharge resistance R4 and MOS switch Q1 are grounded respectively, the leakage of MOS switch Q1
Pole connects current-limiting resistance R1, current-limiting resistance R1 connection laser tube D2 cathode, laser tube D2 anode and photodiode D1 cathode phase
Even, photodiode D1 anode and the one end feedback resistance R5 are connected with the pin 6 of single-chip microcontroller U1 respectively, the feedback resistance R5 other end
Ground connection；
The pin 4 of single-chip microcontroller U1 is grounded, and laser tube D2 anode and photodiode D1 cathode are separately connected power supply.
2. level meter mode of laser group driving circuit according to claim 1, which is characterized in that the supply voltage is 3-
3.5V, laser tube D2 are 808nm laser tube, and the capacitance of power input filter capacitor C1 is 100PF, drive the resistance value of resistance R3
It is 10 ohm, the resistance value of MOS switch Q1 model 2N7002K, discharge resistance R4 are 10000 ohm, the resistance value of current-limiting resistance R1
It is 100 ohm, the resistance value of feedback resistance R5 is 1000 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920607187.XU CN209592617U (en) | 2019-04-29 | 2019-04-29 | A kind of level meter mode of laser group driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920607187.XU CN209592617U (en) | 2019-04-29 | 2019-04-29 | A kind of level meter mode of laser group driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209592617U true CN209592617U (en) | 2019-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920607187.XU Expired - Fee Related CN209592617U (en) | 2019-04-29 | 2019-04-29 | A kind of level meter mode of laser group driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109994925A (en) * | 2019-04-29 | 2019-07-09 | 南京铁道职业技术学院 | A kind of level meter mode of laser group driving circuit |
-
2019
- 2019-04-29 CN CN201920607187.XU patent/CN209592617U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109994925A (en) * | 2019-04-29 | 2019-07-09 | 南京铁道职业技术学院 | A kind of level meter mode of laser group driving circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 |