CN208226298U - A kind of power supply unit and constant-current source of semiconductor laser - Google Patents
A kind of power supply unit and constant-current source of semiconductor laser Download PDFInfo
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- CN208226298U CN208226298U CN201820809780.8U CN201820809780U CN208226298U CN 208226298 U CN208226298 U CN 208226298U CN 201820809780 U CN201820809780 U CN 201820809780U CN 208226298 U CN208226298 U CN 208226298U
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Abstract
This application discloses a kind of power supply unit of semiconductor laser and constant-current sources, which includes at least capture card, for generating input signal；First power supply, the first power supply are connect with capture card and semiconductor laser；Second source, second source are used to provide operating voltage for the first power supply；Third power supply, third power supply are used to provide operating voltage for semiconductor laser；First power supply includes operational amplifier, negative-feedback circuit, transistor, diode and first resistor, and the first input end of operational amplifier is connect with capture card, and the second input terminal of operational amplifier and the output end of operational amplifier connect；The first end of transistor and the output end of operational amplifier connect, and the second end of transistor is connect with semiconductor laser, and the third end of transistor is grounded by first resistor.By the above-mentioned means, the application can be realized high-power, quick response and stable electric current input, the testing efficiency of semiconductor laser chip is improved.
Description
Technical field
This application involves semiconductor laser technique fields, specifically design the power supply unit and constant current of a kind of semiconductor laser
Source.
Background technique
The development of semiconductor laser is in fast-developing period in the world at present, and the laser science technology in China is basic
Maintain the posture with international synchronized development.Due to the high conversion efficiency of semiconductor laser, the service life it is long, it is small in size, light-weight,
High reliablity, the features such as capable of directly modulating and is easily integrated with other semiconductor devices, are cured in military affairs, industrial processes, laser
It has a very wide range of applications in the message areas such as treatment, optic communication, optical storage and laser printing.
The different some other light pumped laser of semiconductor laser, its population inversion are to be injected to be formed by electric current,
High power semiconductor lasers need stable Bulk current injection, so the research for driving power, becomes high-power half and lead
The core technology of body laser.
Current high power constant-current source most of on the market is simultaneously unsatisfactory for semiconductor laser to supply current requirement, mainly deposits
In following problem:
In pulse mode, the power supply response time is long, and the electric current rate of climb is slow, for laser chip test speed and
The fuel factor generated in the course of work is big.
Electric current output is not sufficiently stable, and is easy to appear ripple and overshoot phenomenon, can is very big damage for laser chip.
Laser power supply on the market can seldom accomplish that powerful pulse and constant-current source both of which switch freely；Swashing
In the test of light device, aging and application, according to different demands, need that different electric currents is selected to supply.
Utility model content
The application mainly solves the problems, such as the power supply unit and constant-current source that are to provide a kind of semiconductor laser, can be realized
High-power, quick response and the input of stable electric current, improve the testing efficiency of semiconductor laser chip.
In order to solve the above technical problems, the application the technical solution adopted is that provide a kind of semiconductor laser for Denso
It sets, the power supply unit of semiconductor laser includes at least: capture card, for generating input signal；First power supply, the first power supply
Input terminal is connect with capture card, and the output end of the first power supply is connect with semiconductor laser；Second source, second source and first
Power supply connection, for providing operating voltage for the first power supply；Third power supply, third power supply connect with semiconductor laser, are used for
Operating voltage is provided for semiconductor laser connection；Wherein, the first power supply be constant-current source, the first power supply include operational amplifier,
The first input end of negative-feedback circuit, transistor, diode and first resistor, operational amplifier is connect with capture card, and operation is put
Second input terminal of big device and the output end of operational amplifier are connected by negative-feedback circuit；The first end of transistor is put with operation
The output end connection of big device, the second end of transistor are connect with semiconductor laser, and the third end of transistor passes through first resistor
Ground connection, the first end of one end connection transistor of diode, the other end ground connection of diode.
In order to solve the above technical problems, another technical solution that the application uses is to provide a kind of constant-current source, constant-current source is used
In the power supply unit of semiconductor laser, constant-current source includes operational amplifier, negative-feedback circuit, transistor, diode and first
The first input end of resistance, operational amplifier is connect with capture card, and capture card is for generating input signal, and the of operational amplifier
The output end of two input terminals and operational amplifier is connected by negative-feedback circuit；The first end of transistor and operational amplifier it is defeated
Outlet connection, the second end of transistor are connect with semiconductor laser, and the third end of transistor is grounded by first resistor, two poles
The first end of one end connection transistor of pipe, the other end ground connection of diode.
Through the above scheme, the beneficial effect of the application is: the power supply unit of the semiconductor laser includes at least acquisition
Card, the first power supply, second source and third power supply；First power supply is constant-current source, and the first power supply includes operational amplifier, negative-feedback
Circuit, transistor, diode and first resistor；The noninverting input for the input signal input operational amplifier that capture card generates,
Second input terminal of operational amplifier and the output end of operational amplifier are connected by negative-feedback circuit, and second source is put for operation
Big device provides operating voltage；Third power supply is connect with semiconductor laser, for providing work electricity for semiconductor laser connection
Pressure；The first end of transistor and the output end of operational amplifier connect, and the second end of transistor is connect with semiconductor laser, brilliant
The third end of body pipe is grounded by first resistor, the first end of the cathode connection transistor of diode, the plus earth of diode,
To protect transistor not to be burned；And can be realized high-power, quick response and stable electric current input, improve semiconductor laser
The testing efficiency of device chip.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings.Wherein:
Fig. 1 is the structural schematic diagram of one embodiment of power supply unit of semiconductor laser provided by the present application；
Fig. 2 is the structural schematic diagram of another embodiment of power supply unit of semiconductor laser provided by the present application；
Fig. 3 is analog input voltage in another embodiment of power supply unit of semiconductor laser provided by the present application and defeated
Current waveform schematic diagram out；
Fig. 4 is analog input voltage in another embodiment of power supply unit of semiconductor laser provided by the present application and defeated
Electric current correspondence diagram out；
Fig. 5 is to actually enter voltage and defeated in another embodiment of power supply unit of semiconductor laser provided by the present application
Voltage waveform view out；
Fig. 6 is the structural schematic diagram of the another embodiment of power supply unit of semiconductor laser provided by the present application；
Fig. 7 is the electrical block diagram of constant-current source provided by the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, rather than whole embodiments.Based on this
Embodiment in application, those of ordinary skill in the art are obtained every other under the premise of not making creative labor
Embodiment shall fall in the protection scope of this application.
Refering to fig. 1, Fig. 1 is the structural schematic diagram of one embodiment of power supply unit of semiconductor laser provided by the present application,
The power supply unit of the semiconductor laser includes at least: capture card 11, the first power supply 12, second source 13 and third power supply 14.
Capture card 11 mainly captures the simulations letter such as extraneous photoelectricity, video, audio for generating input signal, capture card 11
Number and digitized import computer carry out digital processing capture device, mainly have image pick-up card, video frequency collection card, sound
Frequency capture card (such as sound card) and data collecting card etc..
Second source 13 is connect with the first power supply 12, and second source 13 is used to provide operating voltage for the first power supply 12, the
Two power supplys 13 are that the first power supply 12 operates normally power supply, and the voltage that usual second source 13 exports is 12V.
Third power supply 14 is connect with semiconductor laser 15, for providing operating voltage for semiconductor laser connection.
The input terminal of first power supply 12 is connect with capture card 11, and capture card 11 is that the first power supply 12 provides input signal, i.e.,
Voltage signal；According to the difference of input signal, the first power supply 12 can work in pulse mode or constant current mode；First power supply 12
Output end connect with semiconductor laser 15, for give semiconductor laser 15 provide operating current.
First power supply 12 is constant-current source, and the first power supply 12 includes operational amplifier 121, negative-feedback circuit 122, transistor
123, diode 124 and first resistor 125.
The first input end of operational amplifier 121 is connect with capture card 11, the second input terminal of operational amplifier 121 with
The output end of operational amplifier 121 is connected by negative-feedback circuit 122, and the first power supply 12 is that operational amplifier 121 provides work
Voltage；Wherein, the first input end of operational amplifier 121 is non-inverting input terminal, and the second input terminal of operational amplifier 121 is anti-
To input terminal.
The first end of transistor 123 is connect with the output end of operational amplifier 121, the second end of transistor 123 with partly lead
Body laser 15 connects, and the third end of transistor 123 is grounded by first resistor 125；Transistor 123 can be metal-oxide-semiconductor, Fig. 1
Shown in be N-type metal-oxide-semiconductor, but be not limited in N-type metal-oxide-semiconductor in the present embodiment；The first end of transistor 123 is grid, crystal
The second end of pipe 123 is drain electrode, and the third end of transistor 123 is source level.
The first end of one end connection transistor 123 of diode 124, the other end ground connection of diode 124；Diode 124
For preventing transistor 123 in pulse mode, high-speed switch causes surge current to damage transistor 123；Institute in Fig. 1
It is shown as the first end of the cathode connection transistor 123 of diode 124, the plus earth of diode 124.
Operational amplifier 121 and negative-feedback circuit 122 constitute amplifier negative-feedback circuit, and there are two special for amplifier negative-feedback circuit
Point: empty short and void is disconnected, therefore the first input end voltage of operational amplifier 121 is equal to the second input terminal phase voltage；When the first electricity
When the resistance value of resistance 125 is fixed value, the voltage that capture card 11 exports is directly proportional to the electric current of 123 second end of transistor；Pass through tune
The voltage that section capture card 11 exports can control the input current of input semiconductor laser 15.
It is different from the prior art, the power supply unit of semiconductor laser provided in this embodiment, the semiconductor laser
Power supply unit includes at least: capture card, the first power supply, second source and third power supply；First power supply is constant-current source, the first power supply
Including operational amplifier, negative-feedback circuit, transistor, diode and first resistor；The input signal that capture card generates inputs fortune
The noninverting input of amplifier is calculated, the second input terminal of operational amplifier and the output end of operational amplifier pass through negative-feedback circuit
Connection, second source provide operating voltage for operational amplifier；Third power supply is connect with semiconductor laser, for being semiconductor
Laser connection provides operating voltage；The first end of transistor and the output end of operational amplifier connect, the second end of transistor
It being connect with semiconductor laser, the third end of transistor is grounded by first resistor, and the of the cathode connection transistor of diode
One end, the plus earth of diode, to protect transistor not to be burned；And it can be realized high-power, quick response and stable
Electric current input, improves the testing efficiency of semiconductor laser chip.
It is the structure of another embodiment of power supply unit of semiconductor laser provided by the present application refering to Fig. 2 and Fig. 3, Fig. 2
The power supply unit of schematic diagram, the semiconductor laser includes at least: computer 21, bleeder circuit 22, the 23, first electricity of capture card
Source 24, second source 25 and third power supply 26.
The input signal that capture card 23 provides is exported by computer 21 by capture card 23, will using bleeder circuit 22
Voltage signal is input to the first power supply 24.
First power supply 24 includes operational amplifier 241, first capacitor 242, transistor 243, diode 244, first resistor
245, second resistance 246,3rd resistor 247 and the second capacitor 248.
The output end of operational amplifier 241 is connect with the first end of transistor 243 by second resistance 246, operation amplifier
The output end and first capacitor 242 of device 241 are coupled to one end of second resistance 246.
The first end of transistor 243 and one end of diode 244 are coupled to the other end of second resistance 246；Transistor 243
Second end connect with the negative terminal of semiconductor laser 27, the anode of semiconductor laser 27 connects third power supply 26；Transistor
243 third end is connect with the second input terminal of operational amplifier 241 by 3rd resistor 247.
Diode 244 can be Transient Suppression Diode, to prevent surge current from damaging transistor 243.
Second source 25 is that operational amplifier 241 provides driving voltage, and second source 25 is connect by the second capacitor 248
Ground.
The circuit of first power supply 24 belongs to amplifier negative-feedback circuit, thus the first input end and fortune of operational amplifier 241
The input voltage for calculating the second input terminal of amplifier 241 is identical, first input end input voltage vin of operational amplifier 241 etc.
Voltage Vo in transistor third end.
As shown in Figure 2, transistor 243 is N-type metal-oxide-semiconductor, since field-effect tube gate source voltage Ugs controls drain current
Id, grid does not consume electric current substantially, thus drain current Id is equal to grid current Is, and the calculation formula of grid current Is is as follows
It is shown:
Is=Vo/R1=Vin/R1
Wherein, R1 is the resistance value of first resistor 245；When the resistance value R1 of first resistor 245 is fixed, input voltage vin and
Drain current Id is directly proportional.
Therefore, the voltage Vin that the electric current Id of 243 second end of transistor output and the first end of operational amplifier 241 input
It is directly proportional.
It is put using the electric current Id of available 243 second end of the transistor output of simulation software (such as multisim) with operation
The waveform diagram of the voltage Vin of the first end input of big device 241, as shown in figure 3, the electricity that the first end of operational amplifier 241 inputs
Pressure is the pulse signal of 2.5V, the resistance value R1=0.5 Ω of first resistor 245, then Id=Vin/R1=2.5V/0.5 Ω=5A.
Between the voltage Vin of the first end input of the electric current Id and operational amplifier 241 of the output of 243 second end of transistor
Corresponding relationship is as shown in Figure 4；By in figure it is known that the electric current Id and operational amplifier 241 of the output of transistor 243 second end
Linearly, and the linearity is relatively good by the voltage Vin of first end input.Therefore it can be exported according to 243 second end of transistor
Electric current Id and operational amplifier 241 first end input voltage Vin between linear relationship, adjust operational amplifier 241
First end input voltage Vin, to obtain electric current required for semiconductor laser 27.
During actual measurement, input signal is generated using signal generator, to measure input signal and output
Relationship between electric current；For example, peak value 2.5V, pulse frequency 100Hz are accounted for as shown in figure 5, input voltage vin is square wave A
Sky is than being 1%；Output waveform figure is as curveb；It is known from figures that, the current-responsive time is 22 μ s, response speed ratio
Comparatively fast, electric current is also relatively more steady.Additionally due to using test fixture to the overshoot of bring failing edge, reality was simultaneously not present
Phenomenon is rushed, so meeting semiconductor laser chip to the high-power of current source, quick response and the requirement for stablizing output.
It is different from the prior art, the power supply unit of semiconductor laser provided in this embodiment includes capture card, the first electricity
Source, second source and third power supply；First power supply include operational amplifier, first capacitor, transistor, diode, first resistor,
Second resistance, 3rd resistor and the second capacitor；Input signal is generated first with capture card, input signal is inputted into operation amplifier
The noninverting input of device, the second input terminal of operational amplifier and the output end of operational amplifier are connected by first capacitor, with
Prevent circuit from generating concussion；The electric current of transistor second end output is directly proportional to the voltage that the first end of operational amplifier inputs,
The voltage that first end by controlling operational amplifier inputs is to control output electric current；It is protected using Transient Suppression Diode brilliant
Body pipe is not burned；And can be realized high-power, quick response and stable electric current input, improve semiconductor laser chip
Testing efficiency.
It is the structural representation of the another embodiment of power supply unit of semiconductor laser provided by the present application refering to Fig. 6, Fig. 6
Figure, the power supply unit of the semiconductor laser includes at least: computer 61, bleeder circuit 62, capture card 63, the first power supply 64,
Second source 65, third power supply 66, voltage regulator circuit 67, current feedback circuit 68 and overcurrent indicating circuit 69.
Wherein, computer 61, bleeder circuit 62, capture card 63, the first power supply 64, second source 65,66 and of third power supply
Connection relationship between semiconductor laser 60 is as described in above-described embodiment, and details are not described herein.
Second source 65 is that voltage regulator circuit 67 and current feedback circuit 68 provide driving voltage；Voltage regulator circuit 67 is for stablizing
The voltage signal that second source 65 exports；Whether the electric current that overcurrent indicating circuit 69 is used to detect the offer of second source 65 is more than pre-
If electric current.
Transistor 643 can form for multiple coupled in parallel, and in order to realize high current warning, the present embodiment is in Fig. 2 institute
Current feedback circuit 68 and overcurrent indicating circuit 69 are increased in the embodiment shown；Output electric current can be passed through into Hall element
Current signal is converted voltage signal by (not shown), and then feedback arrives computer.
Further, since 64 power of the first power supply is bigger, it, can be at electric current output in order to increase safety and reliability
Fuse (not shown) is accessed, to protect circuit and equipment.
The present embodiment, which passes through, increases voltage regulator circuit current feedback circuit and overcurrent indicating circuit, so that semiconductor laser
The safety and reliability of power supply unit is promoted.
It is the electrical block diagram of constant-current source provided by the present application refering to Fig. 7, Fig. 7, which is used for above-mentioned implementation
Example in semiconductor laser power supply unit, the constant-current source include operational amplifier 71, negative-feedback circuit 72, transistor 73,
Diode 74 and first resistor 75.
The first input end of operational amplifier 71 is connect with capture card (not shown), and capture card is for generating input letter
Number, the voltage signal size of input is Vin, and the output end of the second input terminal and operational amplifier 71 of operational amplifier 71 passes through
Negative-feedback circuit 72 connects.
The first end of transistor 73 is connect with the output end of operational amplifier 71, the second end D and semiconductor of transistor 73
The third end of the connection of laser (not shown), transistor 73 is grounded by first resistor 75.
The first end of the cathode connection transistor 73 of diode 74, the plus earth of diode 74.
Further, negative-feedback circuit 72 includes first capacitor C1,71 output end of operational amplifier and first capacitor C1 coupling
It is connected to one end of second resistance 76, the first end of transistor 73 and one end of diode 74 are coupled to the another of second resistance 76
The third end at end, transistor 73 is connect with the second input terminal of operational amplifier 71 by 3rd resistor 77, and second source is (in figure
It is not shown) it is grounded by the second capacitor 78, the voltage swing that second source provides is VCC.
Be different from the prior art, constant-current source provided in this embodiment include operational amplifier, negative-feedback circuit, transistor,
Diode and first resistor；The noninverting input for the input signal input operational amplifier that capture card generates, operational amplifier
The output end of second input terminal and operational amplifier is connected by negative-feedback circuit, and second source provides work for operational amplifier
Voltage；Third power supply is connect with semiconductor laser, for providing operating voltage for semiconductor laser connection；The of transistor
The connection of the output end of one end and operational amplifier, the second end of transistor are connect with semiconductor laser, the third end of transistor
It is grounded by first resistor, the first end of the cathode connection transistor of diode, the plus earth of diode, to protect transistor
It is not burned；And can be realized high-power, quick response and stable electric current input, improve the test of semiconductor laser chip
Efficiency.
The above is only embodiments herein, are not intended to limit the scope of the patents of the application, all to be said using the application
Equivalent structure or equivalent flow shift made by bright book and accompanying drawing content is applied directly or indirectly in other relevant technology necks
Domain similarly includes in the scope of patent protection of the application.
Claims (10)
1. a kind of power supply unit of semiconductor laser, which is characterized in that the power supply unit includes at least:
Capture card, for generating input signal；
The input terminal of first power supply, first power supply is connect with the capture card, the output end of first power supply with partly lead
Body laser connection；
Second source, the second source are connect with first power supply, for providing operating voltage for first power supply；
Third power supply, the third power supply are connect with the semiconductor laser, for mentioning for semiconductor laser connection
For operating voltage；
Wherein, first power supply is constant-current source, and first power supply includes operational amplifier, negative-feedback circuit, transistor, two
Pole pipe and first resistor, the first input end of the operational amplifier are connect with the capture card, and the of the operational amplifier
Two input terminals are connect with the output end of the operational amplifier by the negative-feedback circuit；The first end of the transistor and institute
The output end connection of operational amplifier is stated, the second end of the transistor is connect with the semiconductor laser, the transistor
Third end be grounded by the first resistor, one end of the diode connects the first end of the transistor, two pole
The other end of pipe is grounded.
2. the power supply unit of semiconductor laser according to claim 1, which is characterized in that
One end of the capture card is connect with the first input end of the operational amplifier by bleeder circuit, the capture card
The other end is connect with computer.
3. the power supply unit of semiconductor laser according to claim 2, which is characterized in that
The input signal that the capture card provides is exported by the computer by the capture card, using the partial pressure
Voltage signal is inputted first power supply by circuit.
4. the power supply unit of semiconductor laser according to claim 1, which is characterized in that
The negative terminal of the semiconductor laser is connect with the second end of the transistor, the anode connection of the semiconductor laser
The third power supply.
5. the power supply unit of semiconductor laser according to claim 1, which is characterized in that
The diode is Transient Suppression Diode, to prevent surge current from damaging the transistor.
6. the power supply unit of semiconductor laser according to claim 1, which is characterized in that
The negative-feedback circuit includes first capacitor, and the first end of the operational amplifier output terminal and the transistor passes through the
The connection of two resistance, the third end of the transistor are connect with the second input terminal of the operational amplifier by 3rd resistor, institute
It states second source and passes through the second capacity earth.
7. the power supply unit of semiconductor laser according to claim 6, which is characterized in that
The operational amplifier output terminal and the first capacitor are coupled to one end of the second resistance, and the of the transistor
One end and one end of the diode are coupled to the other end of the second resistance.
8. the power supply unit of semiconductor laser according to claim 1, which is characterized in that
The first input end of the operational amplifier is identical as the input voltage of the second input terminal of the operational amplifier, described
The electric current of transistor second end output is directly proportional to the voltage that the first end of the operational amplifier inputs.
9. a kind of constant-current source, which is characterized in that the constant-current source is used for the power supply unit of semiconductor laser, the constant-current source packet
Include operational amplifier, negative-feedback circuit, transistor, diode and first resistor, the first input end of the operational amplifier with
Capture card connection, the capture card for generating input signal, put by the second input terminal and the operation of the operational amplifier
The output end of big device is connected by the negative-feedback circuit；The output end of the first end of the transistor and the operational amplifier
Connection, the second end of the transistor are connect with semiconductor laser, and the third end of the transistor passes through the first resistor
Ground connection, one end of the diode connect the first end of the transistor, the other end ground connection of the diode.
10. constant-current source according to claim 9, which is characterized in that
The negative-feedback circuit includes first capacitor, and the operational amplifier output terminal and the first capacitor are coupled to the second electricity
One end of one end of resistance, the first end of the transistor and the diode is coupled to the other end of the second resistance, described
The third end of transistor is connect with the second input terminal of the operational amplifier by 3rd resistor, and second source passes through the second electricity
Hold ground connection.
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| CN108847572A (en) * | 2018-05-28 | 2018-11-20 | 深圳瑞波光电子有限公司 | A kind of power supply unit and constant-current source of semiconductor laser |
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| CN108847572A (en) * | 2018-05-28 | 2018-11-20 | 深圳瑞波光电子有限公司 | A kind of power supply unit and constant-current source of semiconductor laser |
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