CN110190507A - A kind of low-power laser and its driving circuit - Google Patents
A kind of low-power laser and its driving circuit Download PDFInfo
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- CN110190507A CN110190507A CN201910604561.5A CN201910604561A CN110190507A CN 110190507 A CN110190507 A CN 110190507A CN 201910604561 A CN201910604561 A CN 201910604561A CN 110190507 A CN110190507 A CN 110190507A
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- 239000003381 stabilizer Substances 0.000 claims description 11
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- 238000005516 engineering process Methods 0.000 description 2
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
-
- 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
Abstract
The invention discloses a kind of low-power laser and its driving circuits, the automatic adjusument of driving voltage may be implemented by supply voltage feedback control circuit, difference amplifier in feedback control circuit or the single-chip microcontroller with analog to digital conversion circuit and D/A converting circuit and control circuit or with ADC and DAC, the accurate control of constant current may be implemented, and when realizing that Width funtion dynamic range is reconciled, high precision constant current is still ensured that, in addition good circuit design guarantees that the Primary Component of circuit will not be burnt because of overheat.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of low-power laser and its driving circuit.
Background technique
Apply the scene of laser more and more common in fields such as mapping, sensings at present, the driving circuit type of laser
Also very much, but it is substantially the driving circuit researched and developed for specific laser model, the adaptation range of driving circuit is non-
It is often narrow, it is possible to which that one of parameter change of voltage, electric current, entire driving circuit just can not work normally.When former is answered
Shown in Figure 1 with wide constant-current drive circuit, D2 is the laser tube for needing to drive, and Q8 is high current transistor, can
To improve the current driving ability of driving circuit, if driving current is less than 10mA, can also directly be exported with difference transport and placing device U2
Driving current.Analog regulation voltage Vdac_in is inputted in the non-inverting input terminal of high-precision difference transport and placing device U2, reverse input end is logical
Overmatching resistance connects over the ground, R1, R2, R3, R4 matched completion.Under this set match parameter, at the both ends current-limiting resistance R6
Voltage be to input to adjust voltage and press Vdac_in, can determine constant driving current I=using precision resister R6
Vdac_in/R6.Doing profound and negative feedbck using U1 avoids driving circuit from generating impedance influences to matching network.It is hindered since U1 is inputted
Anti- very big, output impedance is very small, so other than playing the role of voltage follow, can also be effectively isolated load with match
Network can be improved current precision and avoid loading the influence for generating constant-current circuit.
But the problem of this circuit, is, the supply voltage of amplifier derives from driving voltage VOUT, while VOUT also gives switch
Transistor collector power supply, when VOUT is less than the driving voltage of laser tube, entire circuit is inoperable；When VOUT is long-range
When the driving voltage of laser tube D2, the Vce voltage of Q8 can be relatively high, this brings certain influence to the type selecting of Q8, and
Calorific value on Q8 will increase, and the temperature of entire PCB circuit board can be elevated, this is for the laser tube very sensitive to temperature
One unusual unfavorable factor.If replacing different laser tubes, the hardware parameter of entire circuit is also and then adjusted, comparatively laborious.
Summary of the invention
In view of this, driving voltage may be implemented the present invention provides a kind of low-power laser and its driving circuit
Automatic adjusument.
In order to achieve the above object, a kind of driving circuit of low-power laser provided by the invention is transported including the first difference
Put device U1, the second difference transport and placing device U2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, transistor Q8, wherein the anode of laser tube D2 passes through the transmitting of the 6th resistance R6 and the transistor Q8
Extremely it is connected, the cathode of the laser tube D2 connects with reference to earth signal GND, and the base stage of the transistor Q8 passes through the 5th resistance R5
The output end of the second difference transport and placing device U2 is connected, the collector of the transistor Q8 accesses driving voltage VOUT, the crystalline substance
The emitter of body pipe Q8 is connected through the 3rd resistor R3 with the non-inverting input terminal of the second difference transport and placing device U2, and described second
The non-inverting input terminal of difference transport and placing device U2 pass through the first resistor R1 connection analog regulation voltage source Vdac_in, described second
The inverting input terminal of difference transport and placing device U2 is followed by described with reference to earth signal GND, the second difference transport and placing device through second resistance R2
The inverting input terminal of U2 is connected through the 4th resistance R4 with the output end of the first difference transport and placing device U1, the first difference amplifier
The inverting input terminal of device U1 is connected with its output end, the non-inverting input terminal of the first difference transport and placing device U1 and the laser tube D2
Anode be connected, the power end of the power end of the first difference transport and placing device U1 and the second difference transport and placing device U2 access institute
State driving voltage VOUT, the ground terminal of the ground terminal of the first difference transport and placing device U1 and the second difference transport and placing device U2 connect
It is described to refer to earth signal GND, which is characterized in that the driving circuit further includes supply voltage feedback control circuit, the power supply
Voltage Feedback control circuit is used to driving voltage VOUT described in dynamic regulation, realizes Width funtion working range；The supply voltage
Feedback control circuit is connected to the output end of the first difference transport and placing device U1 or is connected to the collector of the transistor Q8.
Further, the driving circuit further includes voltage-stabiliser tube D5, and the anode of the voltage-stabiliser tube D5 meets the transistor Q8
Collector, the cathode of the voltage-stabiliser tube D5 accesses the driving voltage VOUT.
Further, the supply voltage feedback control circuit includes third difference transport and placing device U3, DCDC controller U4, resistance
Resistance switching network, inductance L8, the second capacitor C2, third capacitor C3；The impedance transformer network includes the 8th resistance R8, the 9th electricity
R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R1 are hindered, the DCDC controller U4's
Voltage input pin Vin connects chip power supply and is connect by the second capacitor C2 described with reference to earth signal GND, the DCDC
Ground pin PGND, AGND of controller U4 is all connected with described with reference to earth signal GND；The power end of the impedance transformer network is
The public connecting end and the access driving voltage of the first end of the first end and the 9th resistance R9 of the 8th resistance R8
VOUT, the power end of the impedance transformer network connect the PWM power supply output of the DCDC controller U4 through the inductance L8
Foot SW, the thirteenth resistor R13 be connected to the 8th resistance R8 second end and the 9th resistance R9 second end it
Between, the points of common connection of the 8th resistance R8 and the thirteenth resistor R13 are controlled through the tenth resistance R10 and DCDC respectively
The feed back input pin FB of device U4 processed is connected, the parallel circuit through the third capacitor C3 and the eleventh resistor R11 meets institute
It states with reference to earth signal GND；The input terminal of the impedance transformer network is the 9th resistance R9's and thirteenth resistor R13
Points of common connection, the input terminal of the impedance transformer network connect described with reference to earth signal GND, institute through the twelfth resistor R12
The input for stating impedance transformer network terminates the output end of the third difference transport and placing device U3, and the third difference transport and placing device U3's is defeated
Outlet and inverting input terminal are shorted, and the power end of the third difference transport and placing device U3 accesses the driving voltage VOUT, and described the
The ground connection termination of three difference transport and placing device U3 is described to refer to earth signal GND, and the non-inverting input terminal of the third difference transport and placing device U3 connects
Connect the output end of the first difference transport and placing device U1 or the collector of the transistor Q8.
Further, the supply voltage feedback control circuit includes with analog to digital conversion circuit ADC and digital-to-analogue conversion electricity
The single-chip microprocessor MCU of road DAC, DCDC controller U4, impedance transformer network, inductance L8, the second capacitor C2, third capacitor C3；It is described
Impedance transformer network includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor
R12, thirteenth resistor R1, the voltage input pin Vin of the DCDC controller U4 connect chip power supply and by described the
Two capacitor C2 meet the reference earth signal GND, and ground pin PGND, AGND of the DCDC controller U4 is all connected with the reference
Earth signal GND；The first end and the 9th resistance R9 that the power end of the impedance transformer network is the 8th resistance R8
The public connecting end and the access driving voltage VOUT of first end, the power end of the impedance transformer network is through the inductance
PWM power supply output the foot SW, the thirteenth resistor R13 that L8 connects the DCDC controller U4 are connected to the 8th resistance
Between the second end of R8 and the second end of the 9th resistance R9, the public affairs of the 8th resistance R8 and the thirteenth resistor R13
Tie point is connected, through the third electricity with the feed back input pin FB of the DCDC controller U4 respectively through the tenth resistance R10 altogether
The parallel circuit of the appearance C3 and eleventh resistor R11 connects described with reference to earth signal GND；The input terminal of the impedance transformer network
For the points of common connection of the 9th resistance R9 and the thirteenth resistor R13, the input terminal of the impedance transformer network is through institute
It states twelfth resistor R12 and meets the reference earth signal GND, the input of the impedance transformer network terminates the single-chip microprocessor MCU
The input terminal (ADC) of output end (DAC), the single-chip microprocessor MCU connects output end or the institute of the first difference transport and placing device U1
State the collector of transistor Q8.
Further, the supply voltage feedback control circuit includes conversion circuit and its control circuit, DCDC controller
U4, impedance transformer network, inductance L8, the second capacitor C2, third capacitor C3；The conversion circuit includes analog to digital conversion circuit ADC '
With D/A converting circuit DAC '；The impedance transformer network includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the tenth
One resistance R11, twelfth resistor R12, thirteenth resistor R1, the voltage input pin Vin of the DCDC controller U4 connect chip
Power supply is simultaneously connect described with reference to earth signal GND, the ground pin of the DCDC controller U4 by the second capacitor C2
PGND, AGND are all connected with described with reference to earth signal GND；The power end of the impedance transformer network is the of the 8th resistance R8
The public connecting end and the access driving voltage VOUT of the first end of one end and the 9th resistance R9, the impedance transformation
The power end of network connects the PWM power supply output foot SW of the DCDC controller U4, the 13rd electricity through the inductance L8
Resistance R13 is connected between the second end of the 8th resistance R8 and the second end of the 9th resistance R9, the 8th resistance R8
With the points of common connection of the thirteenth resistor R13 feed back input through the tenth resistance R10 Yu the DCDC controller U4 respectively
Pin FB is connected, the parallel circuit through the third capacitor C3 and the eleventh resistor R11 meets the reference earth signal GND；
The input terminal of the impedance transformer network is the points of common connection of the 9th resistance R9 and the thirteenth resistor R13, described
The input terminal of impedance transformer network meets the reference earth signal GND through the twelfth resistor R12, the impedance transformer network
Input terminates the output end (DAC ') of the conversion circuit, and the input terminal (ADC') of the conversion circuit connects first difference
The collector of the output end of transport and placing device U1 or the transistor Q8.
The present invention also provides a kind of low-power laser, the low-power laser includes laser tube D2 and recited above
Driving circuit.
Low-power laser and its driving circuit provided by the invention, may be implemented by supply voltage feedback control circuit
The automatic adjusument of driving voltage, difference amplifier in feedback control circuit or has analog to digital conversion circuit and digital-to-analogue conversion
The accurate control of constant current may be implemented in circuit and control circuit or single-chip microcontroller with ADC and DAC, and wide realizing
When voltage dynamic range is reconciled, high precision constant current is still ensured that, in addition good circuit design, has guaranteed the Primary Component of circuit
It will not be burnt because of overheat.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is a kind of drive circuit schematic diagram for low-power laser that the prior art provides；
Fig. 2 is a kind of drive circuit schematic diagram 1 of low-power laser provided in an embodiment of the present invention；
Fig. 3 is a kind of drive circuit schematic diagram 2 of low-power laser provided in an embodiment of the present invention；
Fig. 4 is supply voltage feedback control circuit schematic diagram provided in an embodiment of the present invention；
Fig. 5 is the connection relationship diagram of impedance transformer network provided in an embodiment of the present invention and third difference transport and placing device；
Fig. 6 is the connection relationship diagram of impedance transformer network provided in an embodiment of the present invention and single-chip microcontroller；
Fig. 7 is the connection relationship signal of impedance transformer network provided in an embodiment of the present invention and conversion circuit, control circuit
Figure.
Specific embodiment
The present invention in order to solve the problems existing in the prior art, provides a kind of driving circuit of low-power laser, Neng Goushi
Laser with different model realizes wide-voltage range dynamic regulation.
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to a kind of driving circuit of low-power laser proposed according to the present invention, specific embodiment,
Structure, feature and its effect, detailed description is as follows.In the following description, different " embodiment " or " embodiment " refers to not
It must be the same embodiment.In addition, the feature, structure or feature in one or more embodiments can be combined by any suitable form.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, indicates that there may be three kinds of passes
System, it is specific to understand for example, A and/or B are as follows: it can simultaneously include A and B, can be with individualism A, it can also be with individualism
B can have above-mentioned three kinds of any case.
Referring to attached drawing 2,3, the driving circuit of low-power laser provided in an embodiment of the present invention includes the first difference amplifier
Device U1, the second difference transport and placing device U2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5,
6th resistance R6, transistor Q8, wherein the anode of laser tube D2 passes through the emitter phase of the 6th resistance R6 and the transistor Q8
Even, the cathode of the laser tube D2 connects with reference to earth signal GND, and the base stage of the transistor Q8 passes through the 5th resistance R5 connection
The collector of the output end of the second difference transport and placing device U2, the transistor Q8 accesses driving voltage VOUT, the transistor
The emitter of Q8 is connected through the 3rd resistor R3 with the non-inverting input terminal of the second difference transport and placing device U2, second difference
The non-inverting input terminal of transport and placing device U2 passes through the first resistor R1 connection analog regulation voltage source Vdac_in, second difference
The inverting input terminal of transport and placing device U2 is followed by the reference earth signal GND through second resistance R2, the second difference transport and placing device U2's
Inverting input terminal is connected through the 4th resistance R4 with the output end of the first difference transport and placing device U1, the first difference transport and placing device U1
Inverting input terminal be connected with its output end, the sun of the non-inverting input terminal of the first difference transport and placing device U1 and the laser tube D2
Extremely it is connected, the power end of the power end of the first difference transport and placing device U1 and the second difference transport and placing device U2 access the drive
The ground terminal of dynamic voltage VOUT, the ground terminal of the first difference transport and placing device U1 and the second difference transport and placing device U2 connect described
With reference to earth signal GND；The driving circuit further includes supply voltage feedback control circuit, the supply voltage feedback control circuit
For driving voltage VOUT described in dynamic regulation, Width funtion working range is realized；The supply voltage feedback control circuit connection
The first difference transport and placing device U1 output end (Fig. 3) or be connected to the collector (Fig. 2) of the transistor Q8.The present invention
The driving circuit that embodiment provides, the automatic adjusument of driving voltage may be implemented by supply voltage feedback control circuit.
Further, Fig. 2 and Fig. 3 are referred to, the driving circuit of low-power laser further includes voltage-stabiliser tube D5, the pressure stabilizing
The anode of pipe D5 connects the collector of the transistor Q8, and the cathode of the voltage-stabiliser tube D5 accesses the driving voltage VOUT.It adds
The effect of voltage-stabiliser tube D5 is to avoid the excessive breakdown pipe of the CE voltage of transistor Q8 when driver voltage rises, while can rise
To the effect for sharing thermal losses jointly with Q8, circuit board hot-spot is avoided.It equally, can be effective when driving voltage reduces
VOUT is reduced, so that the thermal losses of device is minimum in circuit board, to reach optimal drive effect.In addition, when supply voltage is anti-
When feedback control circuit is connected on the collector of transistor Q8, if not having voltage-stabiliser tube D5, feedback point directly meets VOUT and can not adjust
Output, therefore the feedback point of supply voltage feedback control circuit will connect the anode in voltage-stabiliser tube D5.
Further, Fig. 4 is referred to, supply voltage feedback control circuit includes third difference transport and placing device U3, DCDC control
Device U4, impedance transformer network, inductance L8, the second capacitor C2, third capacitor C3；The impedance transformer network includes the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R1, the DCDC control
The voltage input pin Vin of device U4 processed connects chip power supply and meets the reference earth signal GND by the second capacitor C2,
Ground pin PGND, AGND of the DCDC controller U4 is all connected with described with reference to earth signal GND；The impedance transformer network
Power end is described in the public connecting end of the first end of the 8th resistance R8 and the first end of the 9th resistance R9 and access
Driving voltage VOUT, the power end of the impedance transformer network connect the PWM electricity of the DCDC controller U4 through the inductance L8
Source output pin SW, the thirteenth resistor R13 be connected to the 8th resistance R8 second end and the 9th resistance R9
Between second end, the points of common connection of the 8th resistance R8 and the thirteenth resistor R13 are respectively through the tenth resistance R10 and institute
State DCDC controller U4 feed back input pin FB be connected, the parallel connection through the third capacitor C3 and the eleventh resistor R11
Circuit connects described with reference to earth signal GND；The input terminal of the impedance transformer network is the 9th resistance R9 and the described 13rd
The input terminal of the points of common connection of resistance R13, the impedance transformer network is believed with connecing the reference through the twelfth resistor R12
Number GND, the input of the impedance transformer network terminate the output end of the third difference transport and placing device U3, the third difference amplifier
The output end and inverting input terminal of device U3 is shorted, and the power end of the third difference transport and placing device U3 accesses the driving voltage
The ground connection termination of VOUT, the third difference transport and placing device U3 are described to refer to earth signal GND, and the third difference transport and placing device U3's is same
Phase input terminal connects the output end of the first difference transport and placing device U1 or the collector of the transistor Q8 as feedback point.
It should be noted that inductance L8 is used to convert the pin SW pwm signal exported to the output voltage of direct current；Second
Capacitor C2 is input filter capacitor, for keeping input voltage more steady；Third capacitor C3 is for smooth difference transport and placing device U3's
Output avoids other noises from interfering feedback signal；The non-inverting input terminal of U3 is the practical driving voltage of laser tube D2, U3's
Purpose is to reduce output impedance by increasing input impedance, and realize voltage follow in order to which U1 and impedance transformer network is isolated.
U4 FB pin connection U4 internal error amplifier, the voltage of FB pin be approximately considered it is constant, by third difference transport and placing device U3
Output end FB pin is connected to by impedance transformer network, electricity may be implemented not changing the resistance value of impedance transformer network
The automatic adjustment of pressure.When the driving voltage of D2 needs to improve, the output end voltage of U3 is also increased, according to Nortons theorem,
By the adjusting of impedance transformer network, VOUT can be made also accordingly to increase, to improve the driving voltage of D2, guarantee D2 can
It is not in Q8 off state by conducting.The available different input and output voltage of resistance value for changing impedance transformer network becomes
Coefficient is changed, different matching network resistance values can be used according to actual circuit conditions.
Fig. 5 is referred to, it, can be with as Fig. 4 middle impedance converting network and third difference transport and placing device U3 connection relationship diagram
Find out that the voltage V1 of the non-inverting input terminal of third difference transport and placing device U3 is equal with the voltage V2 of the input terminal of impedance transformer network,
Realize voltage follow function V1=V2.
As a kind of deformation of Fig. 4, the supply voltage feedback control circuit includes having analog to digital conversion circuit ADC sum number
The single-chip microprocessor MCU of analog conversion circuit DAC, DCDC controller U4, impedance transformer network, inductance L8, the second capacitor C2, third capacitor
C3；The impedance transformer network includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the 12nd
Resistance R12, thirteenth resistor R1, the voltage input pin Vin of the DCDC controller U4 connect chip power supply and pass through institute
It states the second capacitor C2 and meets the reference earth signal GND, ground pin PGND, AGND of the DCDC controller U4 is all connected with described
With reference to earth signal GND；The first end and the 9th resistance that the power end of the impedance transformer network is the 8th resistance R8
The public connecting end of the first end of R9 and the access driving voltage VOUT, described in the power end warp of the impedance transformer network
PWM power supply output the foot SW, the thirteenth resistor R13 that inductance L8 connects the DCDC controller U4 are connected to the described 8th
Between the second end of resistance R8 and the second end of the 9th resistance R9, the 8th resistance R8 and the thirteenth resistor R13
Points of common connection be connected respectively through the tenth resistance R10 with the feed back input pin FB of the DCDC controller U4, through described
The parallel circuit of three capacitor C3 and the eleventh resistor R11 connect described with reference to earth signal GND；The impedance transformer network it is defeated
Enter the points of common connection that end is the 9th resistance R9 and the thirteenth resistor R13, the input terminal of the impedance transformer network
It is connect through the twelfth resistor R12 described with reference to earth signal GND, the input termination single-chip microcontroller of the impedance transformer network
The output end (DAC) of MCU, the input terminal (ADC) of the single-chip microprocessor MCU connect the first difference transport and placing device U1 output end or
The collector of transistor Q8 described in person.As can be seen that this deformation is with analog to digital conversion circuit ADC and D/A converting circuit
The single-chip microprocessor MCU of DAC replaces third difference transport and placing device U3, by driving voltage end (non-inverting input terminal of former U3) conduct of laser tube
The input (side ADC) of single-chip microcontroller, the input terminal (output of former U3 of the output (side DAC) of single-chip microcontroller as impedance transformer network
End), subdivision can be done according to the different driving voltage of laser tube to be adjusted.Fig. 6 is referred to, although ADC the and DAC pin of single-chip microcontroller
Driving capability and input impedance do not have difference amplifier effect good, and the linearity that voltage is adjusted can be slightly worse than the feelings using transport and placing device U3
Condition, but the mapping relations of driving voltage and output voltage can be accomplished by the operation program inside control single chip computer.
As another deformation of Fig. 4, the supply voltage feedback control circuit includes conversion circuit, control circuit
MCU ', DCDC controller U4, impedance transformer network, inductance L8, the second capacitor C2, third capacitor C3；The conversion circuit includes
Analog to digital conversion circuit ADC ' and D/A converting circuit DAC '；The impedance transformer network include the 8th resistance R8, the 9th resistance R9,
The voltage of tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R1, the DCDC controller U4 are defeated
Enter pin Vin to connect chip power supply and connect by the second capacitor C2 described with reference to earth signal GND, the DCDC controller
Ground pin PGND, AGND of U4 is all connected with described with reference to earth signal GND；The power end of the impedance transformer network is described the
The public connecting end of the first end of eight resistance R8 and the first end of the 9th resistance R9 and the access driving voltage VOUT,
The power end of the impedance transformer network connects the PWM power supply output foot SW of the DCDC controller U4 through the inductance L8,
The thirteenth resistor R13 is connected between the second end of the 8th resistance R8 and the second end of the 9th resistance R9, institute
The points of common connection of the 8th resistance R8 and the thirteenth resistor R13 are stated respectively through the tenth resistance R10 and the DCDC controller
The feed back input pin FB of U4 is connected, the parallel circuit through the third capacitor C3 and the eleventh resistor R11 connects the ginseng
Examine earth signal GND；The input terminal of the impedance transformer network is the public of the 9th resistance R9 and thirteenth resistor R13
Tie point, the input terminal of the impedance transformer network connect described with reference to earth signal GND, the resistance through the twelfth resistor R12
The input of resistance switching network terminates the output end (DAC ') of the conversion circuit, input terminal (ADC') connection of the conversion circuit
The output end of the first difference transport and placing device U1 or the collector of the transistor Q8.As can be seen that this deformation is to use to turn
Change circuit and control circuit MCU ' and replace third difference transport and placing device U3, conversion circuit include high precision analogue conversion circuit ADC ' and
Voltage adjusting is done in high-precision D/A converting circuit DAC ', control circuit MCU ' cooperation.Fig. 7 is referred to, due to using individually
ADC ' and DAC ', inside are difference operational amplifying circuits, can effectively solve input impedance and the output band of common input and output pin
The problem of load capacity, while can accomplish that sensitivity is very high on voltage adjustment Theory, the degree of regulation of this circuit is most
High.
Driving circuit provided in an embodiment of the present invention is applicable not only to the driving of laser tube, all may be used for any constant-current circuit
To be applicable in, as long as voltage is within prescribed limit.
The embodiment of the invention also provides a kind of low-power lasers, including laser tube D2 and driving recited above electricity
Road.
Low-power laser and its driving circuit provided in an embodiment of the present invention by difference amplifier or have modulus
Conversion circuit and D/A converting circuit and control circuit or single-chip microcontroller with ADC and DAC, may be implemented the essence of constant current
Really control, and when realizing that Width funtion dynamic range is reconciled, still ensure that high precision constant current, in addition good circuit is set
Meter, guarantees that the Primary Component of circuit will not be burnt because of overheat.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of driving circuit of low-power laser, the driving circuit includes the first difference transport and placing device U1, the second difference fortune
Put device U2, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, crystal
Pipe Q8, wherein the anode of laser tube D2 is connected by the 6th resistance R6 with the emitter of the transistor Q8, the laser tube D2
Cathode connect with reference to earth signal GND, the base stage of the transistor Q8 is transported by the 5th resistance R5 connection second difference
The output end of device U2 is put, the collector of the transistor Q8 accesses driving voltage VOUT, and the emitter of the transistor Q8 is through institute
It states 3rd resistor R3 to be connected with the non-inverting input terminal of the second difference transport and placing device U2, the same phase of the second difference transport and placing device U2
Input terminal passes through the first resistor R1 connection analog regulation voltage source Vdac_in, the reverse phase of the second difference transport and placing device U2
Input terminal through second resistance R2 be followed by it is described refer to earth signal GND, the inverting input terminal of the second difference transport and placing device U2 is through the
Four resistance R4 are connected with the output end of the first difference transport and placing device U1, the inverting input terminal of the first difference transport and placing device U1 with
Its output end is connected, and the non-inverting input terminal of the first difference transport and placing device U1 is connected with the anode of the laser tube D2, and described the
The power end of the power end of one difference transport and placing device U1 and the second difference transport and placing device U2 access the driving voltage VOUT, institute
The ground terminal of the ground terminal and the second difference transport and placing device U2 of stating the first difference transport and placing device U1 connects described with reference to earth signal
GND, which is characterized in that the driving circuit further includes supply voltage feedback control circuit, the supply voltage feedback control electricity
Road is used to driving voltage VOUT described in dynamic regulation, realizes Width funtion working range；The supply voltage feedback control circuit connects
Connect the first difference transport and placing device U1 output end or be connected to the collector of the transistor Q8.
2. the driving circuit of low-power laser according to claim 1, which is characterized in that the driving circuit further includes
Voltage-stabiliser tube D5, the anode of the voltage-stabiliser tube D5 connect the collector of the transistor Q8, described in the cathode access of the voltage-stabiliser tube D5
Driving voltage VOUT.
3. the driving circuit of low-power laser according to claim 2, which is characterized in that the supply voltage feedback control
Circuit processed includes third difference transport and placing device U3, DCDC controller U4, impedance transformer network, inductance L8, the second capacitor C2, third electricity
Hold C3；The impedance transformer network includes the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the tenth
Two resistance R12, thirteenth resistor R1, the voltage input pin Vin of the DCDC controller U4 connect chip power supply and pass through
The second capacitor C2 meets the reference earth signal GND, and ground pin PGND, AGND of the DCDC controller U4 is all connected with institute
It states with reference to earth signal GND；The first end and the 9th electricity that the power end of the impedance transformer network is the 8th resistance R8
The public connecting end of the first end of R9 and the access driving voltage VOUT are hindered, the power end of the impedance transformer network is through institute
It states inductance L8 and connects PWM power supply output the foot SW, the thirteenth resistor R13 of the DCDC controller U4 and be connected to described
Between the second end of eight resistance R8 and the second end of the 9th resistance R9, the 8th resistance R8 and the thirteenth resistor
The points of common connection of R13 is connected, with the feed back input pin FB of the DCDC controller U4 through described through the tenth resistance R10 respectively
The parallel circuit of third capacitor C3 and the eleventh resistor R11 connect described with reference to earth signal GND；The impedance transformer network
Input terminal is the points of common connection of the 9th resistance R9 and the thirteenth resistor R13, the input of the impedance transformer network
End meets the reference earth signal GND through the twelfth resistor R12, and it is poor that the input of the impedance transformer network terminates the third
Divide the output end of transport and placing device U3, the output end and inverting input terminal of the third difference transport and placing device U3 are shorted, the third difference
The power end of transport and placing device U3 accesses the driving voltage VOUT, and the ground connection termination of the third difference transport and placing device U3 is described with reference to ground
Signal GND, the non-inverting input terminal of the third difference transport and placing device U3 connect the first difference transport and placing device U1 output end or
The collector of the transistor Q8.
4. the driving circuit of low-power laser according to claim 2, which is characterized in that the supply voltage feedback control
Circuit processed includes the single-chip microprocessor MCU with analog to digital conversion circuit ADC and D/A converting circuit DAC, DCDC controller U4, impedance change
Switching network, inductance L8, the second capacitor C2, third capacitor C3；The impedance transformer network includes the 8th resistance R8, the 9th resistance
R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R1, the electricity of the DCDC controller U4
Pressure input pin Vin connects chip power supply and is connect by the second capacitor C2 described with reference to earth signal GND, the DCDC control
Ground pin PGND, AGND of device U4 processed is all connected with described with reference to earth signal GND；The power end of the impedance transformer network is institute
State the public connecting end of the first end of the 8th resistance R8 and the first end of the 9th resistance R9 and the access driving voltage
VOUT, the power end of the impedance transformer network connect the PWM power supply output of the DCDC controller U4 through the inductance L8
Foot SW, the thirteenth resistor R13 be connected to the 8th resistance R8 second end and the 9th resistance R9 second end it
Between, the points of common connection of the 8th resistance R8 and the thirteenth resistor R13 are controlled through the tenth resistance R10 and DCDC respectively
The feed back input pin FB of device U4 processed is connected, the parallel circuit through the third capacitor C3 and the eleventh resistor R11 meets institute
It states with reference to earth signal GND；The input terminal of the impedance transformer network is the 9th resistance R9's and thirteenth resistor R13
Points of common connection, the input terminal of the impedance transformer network connect described with reference to earth signal GND, institute through the twelfth resistor R12
The input for stating impedance transformer network terminates the output end (DAC) of the single-chip microprocessor MCU, the input terminal (ADC) of the single-chip microprocessor MCU
Connect the output end of the first difference transport and placing device U1 or the collector of the transistor Q8.
5. the driving circuit of low-power laser according to claim 2, which is characterized in that the supply voltage feedback control
Circuit processed includes conversion circuit and its control circuit, DCDC controller U4, impedance transformer network, inductance L8, the second capacitor C2,
Three capacitor C3；The conversion circuit includes analog to digital conversion circuit ADC ' and D/A converting circuit DAC '；The impedance transformer network
Including the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor
R1, the voltage input pin Vin of the DCDC controller U4 connect chip power supply and are connect by the second capacitor C2 described
With reference to earth signal GND, ground pin PGND, AGND of the DCDC controller U4 is all connected with described with reference to earth signal GND；It is described
The power end of impedance transformer network is the public company of the first end of the 8th resistance R8 and the first end of the 9th resistance R9
End and the access driving voltage VOUT are met, the power end of the impedance transformer network is through the inductance L8 connection DCDC
PWM power supply output the foot SW, the thirteenth resistor R13 of controller U4 is connected to second end and the institute of the 8th resistance R8
Between the second end for stating the 9th resistance R9, the points of common connection of the 8th resistance R8 and the thirteenth resistor R13 pass through respectively
Tenth resistance R10 is connected, through the third capacitor C3 and the described tenth with the feed back input pin FB of the DCDC controller U4
The parallel circuit of one resistance R11 connects described with reference to earth signal GND；The input terminal of the impedance transformer network is the 9th resistance
The points of common connection of R9 and the thirteenth resistor R13, the input terminal of the impedance transformer network is through the twelfth resistor R12
The reference earth signal GND is met, the input of the impedance transformer network terminates the output end (DAC ') of the conversion circuit, described
The input terminal (ADC') of conversion circuit connects the output end of the first difference transport and placing device U1 or the current collection of the transistor Q8
Pole.
6. a kind of low-power laser, which is characterized in that the low-power laser includes laser tube D2 and claim 1 to 5
Any one of described in driving circuit.
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| CN201910604561.5A CN110190507A (en) | 2019-07-05 | 2019-07-05 | A kind of low-power laser and its driving circuit |
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