CN206516893U - A kind of constant-current source circuit for semiconductor laser - Google Patents
A kind of constant-current source circuit for semiconductor laser Download PDFInfo
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- CN206516893U CN206516893U CN201720067484.0U CN201720067484U CN206516893U CN 206516893 U CN206516893 U CN 206516893U CN 201720067484 U CN201720067484 U CN 201720067484U CN 206516893 U CN206516893 U CN 206516893U
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Abstract
The utility model is related to a kind of constant-current source circuit for semiconductor laser, including constant pressure source, constant-current source and voltage adaptive circuit；The input of the constant pressure source is connected with communication power supply；Output end connects one end of semiconductor laser；The constant-current source includes amplifier 1, amplifier 2, metal-oxide-semiconductor 2 and current sampling resistor；The voltage adaptive is electrically connected between constant-current source and constant pressure source.The utility model voltage adaptive feedback closed loop is designed, and is made voltage output follow semiconductor laser required voltage to change and change, is automatically adjusted.Keep the pressure drop on constant-current source power tube constant, substantially reduce the heating of circuit system, constant-current source part need not carry out fan and be radiated, so as to reduce the volume of whole system.
Description
Technical field
The utility model is related to power circuit technical field, more particularly to a kind of constant-current source electricity for semiconductor laser
Road.
Background technology
With the continuous increase of laser product demand, the product such as laser marking machine, optical-fiber laser cutting machine is obtained greatly
The use of amount, the demand of the core component semiconductor laser of these products also increases into multiple, and semiconductor swashs
The test of light device is accomplished by substantial amounts of special constant-current source, the special perseverance of unit noise spectra of semiconductor lasers such as enterprise, scientific research institutions, colleges and universities
Stream source is in great demand.
Existing semiconductor laser constant-current source is primarily present following shortcoming：1. output voltage range is small or can not realize electricity
Pressure is adaptive.2. constant-current source circuit system heat generation is big, radiating treatment is complicated.3. current waveform rising edge is slow, it is impossible to meet half
The requirement of conductor laser.4. there is current over pulse at current waveform rising edge, semiconductor laser is easily damaged.
Because existing semiconductor laser constant-current source has disadvantage mentioned above, it is badly in need of a wide adaptability, stability high
Constant-current source circuit.
Utility model content
In view of above-mentioned analysis, the utility model aims to provide a kind of constant-current source circuit for semiconductor laser, use
The problem of to solve existing constant-current source bad adaptability and not high stability.
The purpose of this utility model is mainly achieved through the following technical solutions：
A kind of constant-current source circuit for semiconductor laser, including constant pressure source, constant-current source and voltage adaptive circuit；
The input of the constant pressure source is connected with communication power supply；Output end connects one end of semiconductor laser；
The constant-current source includes amplifier 1, amplifier 2, metal-oxide-semiconductor 2 and current sampling resistor；
One end connection that the output end of the amplifier 1 is connected in the grid of metal-oxide-semiconductor 2, the source electrode and drain electrode of metal-oxide-semiconductor 2 is partly led
The other end in the other end of body laser, the source electrode and drain electrode of metal-oxide-semiconductor 2 connects one end of current sampling resistor；Current sample
The other end ground connection of resistance；The current feedback that current sampling resistor is adopted to amplifier 2, the output end of amplifier 2 connects the input of amplifier 1
End；
The voltage adaptive is electrically connected between constant-current source and constant pressure source.
Further, the voltage adaptive circuit includes amplifier 3, amplifier 4 and amplifier 5；The amplifier 3 is used for differential amplification
Voltage between the source electrode of metal-oxide-semiconductor 2 and drain electrode, the output of amplifier 3 is connected to the reverse input end of amplifier 4；The forward direction of the amplifier 4
Input inputs a fixed voltage, and the voltage follow of amplifier 5 is passed through again via the voltage after the differential amplification of amplifier 4；Amplifier 5 is defeated
Go out to connect the control voltage input of constant pressure source.
Further, the constant-current source also includes mode of operation selection and size of current regulation circuit；The mode of operation choosing
Select and size of current regulation circuit includes analog switch 1, analog switch 2, triode T, resistance R1~R4；The analog switch 1
Output end by resistance R1 connecting triodes T colelctor electrode, the base that the analog switch 2 passes through resistance R2 connecting triodes T
Pole, triode T grounded emitters, the colelctor electrode of triode also by the input of resistance R3 connections amplifier 1, the resistance R4's
One end is connected between resistance R3 and the input of amplifier 1, resistance R4 other ends ground connection；The input signal of analog switch 1 is outside
Control constant-current source size of current signal and inside automatically control constant-current source high low signal manually；The input signal of analog switch 2 is
Control constant-current source switching signal and external pulse control signal.
Further, it is provided with rise-time of current accelerating circuit between the output end of the amplifier 1 and the grid of metal-oxide-semiconductor 2；
The rise-time of current accelerating circuit includes electric capacity C1, electric capacity C2 and resistance R5；With electricity after electric capacity C2 and resistance the R5 series connection
Hold C1 to be connected in parallel between the grid of the output end of amplifier 1 and metal-oxide-semiconductor 2.
Further, in addition to metal-oxide-semiconductor 1 and thermal-shutdown circuit；The metal-oxide-semiconductor 1 is connected to constant pressure source and semiconductor laser
Between device, the grid of metal-oxide-semiconductor 1 connects+5V voltages, and one end in drain electrode and source electrode is connected with constant pressure source output terminal, drain electrode and source electrode
In the other end be connected with one end of semiconductor laser；Thermistor of the thermal-shutdown circuit including negative temperature coefficient,
Voltage collector 1, voltage comparator 1, diode 1；The thermistor is used for the temperature for gathering semiconductor laser, and voltage is adopted
Voltage on the collection thermistor of storage 1, voltage comparator 1, voltage comparator described in the control source that voltage collector 1 is gathered
The negative pole of 1 output connection diode, one end that diode cathode connection metal-oxide-semiconductor 1 is connected with constant pressure source.
Further, in addition to current foldback circuit, the current foldback circuit includes voltage collector 2, amplifier 6, voltage
Comparator 2, diode 2；The voltage collector 2 is used for the voltage for gathering current sampling resistor two ends；Voltage collector is gathered
Voltage amplifies input voltage comparator 2 through amplifier 6；The negative pole of the output connection diode 2 of voltage comparator 2, the positive pole of diode 2
One end that connection metal-oxide-semiconductor 1 is connected with constant pressure source.
Further, in addition to overvoltage crowbar, the overvoltage crowbar includes voltage collector 3, amplifier 7, voltage
Comparator 3, diode 3；The voltage collector is used for the voltage for gathering semiconductor laser two ends；Voltage collector collection electricity
Input voltage comparator 3 after pressure reduces through amplifier 7；The negative pole of the output connection diode 3 of voltage comparator 3, the positive pole of diode 3
One end that connection metal-oxide-semiconductor 1 is connected with constant pressure source.
Further, the metal-oxide-semiconductor 2 is the FET that TO-247 is encapsulated, and the current sampling resistor temperature drift is 20ppm.
Further, the constant-current source circuit is integrated on circuit boards, and it is 2 ounces that the circuit board, which applies copper thickness,；Circuit board
Copper pad surface turmeric.
The utility model has the beneficial effect that：
1. voltage adaptive feedback closed loop is designed, voltage output is set to follow semiconductor laser required voltage to change and become
Change, automatically adjust.
2. voltage adaptive is designed, the pressure drop on constant-current source power tube can be kept constant, circuit system is substantially reduced
Heating, constant-current source part need not carry out fan and be radiated, so as to reduce the volume of whole system.
3. rise-time of current accelerating circuit, can make electric current be climbed to maximum current value.
4. overshoot suppression circuit, make electric current keep rapid increase along while occur without overshoot current.
Other feature and advantage of the present utility model will illustrate in the following description, also, partial from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages can pass through
Specifically noted structure is realized and obtained in the specification, claims and accompanying drawing write.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as to limitation of the present utility model, whole
In accompanying drawing, identical reference symbol represents identical part.
Fig. 1 is constant-current source circuit block diagram of the embodiment of the present invention；
Fig. 2 is constant-current source schematic diagram of the embodiment of the present invention；
Fig. 3 is rise-time of current accelerating circuit structural representation of the present invention；
Fig. 4 is voltage adaptive circuit structure diagram of the embodiment of the present invention；
Fig. 5 is excess temperature of the embodiment of the present invention, overvoltage, current foldback circuit structure chart.
Embodiment
Preferred embodiment of the present utility model is specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application one
Point, and for explaining principle of the present utility model together with embodiment of the present utility model.
As shown in Figure 1-2, semiconductor laser constant-current source circuit is used in the present embodiment, including：Constant pressure source, metal-oxide-semiconductor 1,
Constant-current source, voltage adaptive circuit, overvoltage crowbar, current foldback circuit and thermal-shutdown circuit.
Outsourcing Switching Power Supply may be selected in constant pressure source, and the input of constant pressure source is connected with communication power supply；The grid of metal-oxide-semiconductor 1
Pole connects+5V voltages, and one end in drain electrode and source electrode is connected with constant pressure source output, and the other end in drain electrode and source electrode swashs with semiconductor
One end of light device is connected.
Constant-current source includes amplifier 1, amplifier 2, metal-oxide-semiconductor 2 and current sampling resistor.The output end connection metal-oxide-semiconductor 2 of amplifier 1
Grid, the source electrode of metal-oxide-semiconductor 2, one end of drain electrode connect the other end of semiconductor laser and one end of current sampling resistor respectively；
The current sampling resistor other end is grounded；The current feedback that current sampling resistor is adopted to amplifier 2, the output end of amplifier 2 connects amplifier 1
Input.Metal-oxide-semiconductor 2 is using encapsulating greatly, the FET of the TO-247 encapsulation of radiating good, it is ensured that circuit system it is reliable
Operation.The temperature drift of current sampling resistor is 20ppm, effective shadow that must reduce variation of ambient temperature to constant-current source current precision
Ring.Constant-current source operation principle：The output signal of amplifier 1 controls the grid of metal-oxide-semiconductor 2, and current sampling resistor is anti-by the current signal adopted
Amplifier of feeding 2, amplifier 2 is exported again to amplifier 1, the voltage on negative-feedback, stabling current sampling resistor is constituted, so as to stabilize stream
Electric current on overcurrent sampling resistor.
The constant-current source also includes mode of operation selection and size of current regulation circuit；The mode of operation selection and electric current
Big minor adjustment circuit includes analog switch 1, analog switch 2, triode T, resistance R1~R4；The output end of the analog switch 1
By resistance R1 connecting triodes T colelctor electrode, the analog switch 2 passes through resistance R2 connecting triodes T base stage, triode
T grounded emitters, the colelctor electrode of triode is also by the input of resistance R3 connections amplifier 1, and one end of the resistance R4 is connected
Between resistance R3 and the input of amplifier 1, resistance R4 other ends ground connection；The input signal of analog switch 1 controls for external hand
Constant-current source high low signal and inside automatically control constant-current source high low signal；The input signal of analog switch 2 is opened for control constant-current source
OFF signal and external pulse control signal.
Constant-current source has two kinds of mode of operations of direct current and pulse, and DC mode has two kinds of working methods：External hand adjusts mould
Formula and internal automatic control mode.By analog switch 1 select constant-current source size of current by external hand control or it is internal from
Dynamic control.External hand is by outside current adjusting knob operational control, and inside is automatically controlled by computer control.Outside hand
Dynamic or inner automatic adjustment is the increase and decrease of control input voltage signal into analog switch 1, so that control input is to amplifier 1
Size of current, realizes the size control of constant-current source output current.Constant-current source is selected to be operated in DC mode also by analog switch 2
It is pulse mode.When the selection external pulse control signal input of analog switch 2, constant-current source is operated in pulse mode, triode
Conducting, the input signal for being input to amplifier 1 is pulse signal.When analog switch selection control constant-current source switching signal input,
The cut-off or conducting of triode are controlled by the way that the signal is ON signal or OFF signal, when triode ends, constant-current source is controlled
Size of current signal works；When triode ON, control constant-current source size of current signal does not work.
As shown in figure 3, when circuit is operated in pulsed operation state, amplifier 1 output end and metal-oxide-semiconductor 2 grid it
Between rise-time of current accelerating circuit, including electric capacity C1, electric capacity C2 and resistance R5 are set.With electric capacity after electric capacity C2 and resistance R5 series connection
C1 is connected in parallel between the grid of the output end of amplifier 1 and metal-oxide-semiconductor 2.The effect of circuit is to accelerate the constant current ource electric current rate of climb, is made
Current waveform rising edge is precipitous.Principle：Electric capacity and capacitance-resistance string, two electric capacity and MOS are added between amplifier 1, the grid of metal-oxide-semiconductor 2
The parasitic capacitance series connection of the grid of pipe 2, can be to impulse waveform partial pressure, so that the parasitic capacitance charging rate of the grid of metal-oxide-semiconductor 2 adds
It hurry up, constant-current source current waveform, which rises, to be accelerated, resistance role is to prevent constant-current source current waveform from rising too fast formed and overshooting.
As shown in figure 4, voltage adaptive circuit includes amplifier 3, amplifier 4, amplifier 5；Amplifier 3 is used for differential amplification metal-oxide-semiconductor 2
Voltage between source electrode and drain electrode, the output of amplifier 3 is connected to the reverse input end of amplifier 4；The positive input of the amplifier 4
A fixed voltage is inputted, the voltage follow of amplifier 5 is passed through again via the voltage after the differential amplification of amplifier 4；The output connection of amplifier 5
The control voltage input of constant pressure source.Whole voltage adaptive circuit is negative feedback structure, the circuit stability metal-oxide-semiconductor 2 drain electrode and
Voltage between source electrode is in setting value, so that as external semiconductor laser required voltage changes, the output of constant pressure source is electric
Buckling, reaches voltage adaptive.Because there is voltage adaptive function, the voltage at the drain electrode of metal-oxide-semiconductor 2 and source electrode two ends is kept not
Become, its power consumption will not increase too much with electric current increase, be compared with the circuit without voltage adaptive function, the entirety of circuit
Caloric value reduces；Constant-current source part need not set fan to be radiated, and reduce the volume of whole constant-current source circuit.
As shown in figure 5, thermal-shutdown circuit includes thermistor, voltage collector 1, the voltage comparator of negative temperature coefficient
1st, diode 1.The voltage that thermistor is used on the temperature for gathering semiconductor laser, the collection thermistor of voltage collector 1
Input the voltage comparator 1, the negative pole of the output connection diode of voltage comparator 1, diode cathode connection metal-oxide-semiconductor 1 with
The connected one end of constant pressure source.Voltage signal on thermistor is compared the hair of the signal after being compared with the voltage signal set
The control pole for the metal-oxide-semiconductor 1 being sent in major loop, inside semiconductor laser during excess temperature, the metal-oxide-semiconductor shut-off in major loop is prevented
Only semiconductor laser is burnt out.
Current foldback circuit includes voltage collector 2, amplifier 6, voltage comparator 2, diode 2.Voltage collector 1 is used for
Gather the voltage at current sampling resistor two ends；The collection voltages of voltage collector 1 amplify 40 times of input voltage comparators 2 through amplifier 6；
The negative pole of the output connection diode 2 of voltage comparator 2, the positive pole of diode 2 connects one end that metal-oxide-semiconductor 1 is connected with constant pressure source.Electricity
Flow the voltage after the collection of sampling resistor both end voltage with setting to be compared, the signal after comparing is likewise transmitted to major loop
In metal-oxide-semiconductor 1 control pole, when current sampling resistor excessively stream, the metal-oxide-semiconductor 1 in major loop is turned off, effectively protection semiconductor swash
The safety of light device.
Overvoltage crowbar includes voltage collector 3, amplifier 7, voltage comparator 3, diode 3.Voltage collector 3 is used for
Gather the voltage at semiconductor laser two ends；Input voltage comparator after voltage collector collection voltages reduce 50 times through amplifier 7
3；The negative pole of the output connection diode 3 of voltage comparator 3, the positive pole of diode 3 connects one end that metal-oxide-semiconductor 1 is connected with constant pressure source.
It is compared after the voltage acquisition at semiconductor laser two ends with the voltage that sets, the signal after comparing is likewise transmitted to master
The control pole of metal-oxide-semiconductor 1 in loop, when the electric voltage over press at semiconductor laser two ends, the metal-oxide-semiconductor 1 in major loop is turned off, and is had
The safety of effect protection semiconductor laser.
Principle：Signal is compared with the signal that sets by voltage comparator, more than the signal of setting, then voltage
Comparator exports low level, conversely, voltage comparator exports high level, above three signal is finally by diode, according to two
The forward conduction characteristic of pole pipe, as long as there is a signal to be low level, because the grid of metal-oxide-semiconductor pulls up 5V voltages, metal-oxide-semiconductor is cut
Only, the electric current for flowing through metal-oxide-semiconductor disconnects, and plays a protective role；Above-mentioned metal-oxide-semiconductor 1 is connected in constant-current source major loop, is played switch and is made
With constant-current source is stopped power supply to semiconductor laser, effectively the safety of protection semiconductor laser.
Circuit board is using two ounces of deposited copper, it is ensured that circuit board can carry the requirement of high current, and turmeric technique ensure that
The reliability that solder joint is welded on circuit board, the stability and reliability of circuit system are improved from technique aspect.
This circuit system can ensure semiconductor laser steady operation, with Anti-surging, anti-current over pulse, it is anti-overvoltage,
The functions such as anti-overflow, anti-excess temperature.Based on voltage adaptive circuit, this circuit system can be with relative broad range noise spectra of semiconductor lasers
Semiconductor laser be powered, change semiconductor laser in relative broad range, circuit system need not be adjusted, subtract
The time of adjustment circuit system is lacked.
Circuit system index：Voltage adaptive scope：0V-200V, voltage ripple maximum 500mVp-p, constant current ource electric current is defeated
Go out scope：0A-15A, current ripples maximum 30mA, constant-current source is in pulsed operation, and current waveform rising edge is less than 1us,
Current ripples are without overshoot phenomenon.Voltage adaptive circuit ensures that constant-current source power tube power consumption is less than 5W in maximum current, it is to avoid
Excessive heat is produced, the infringement of noise spectra of semiconductor lasers is reduced, improves the stability of product.
This constant-current source circuit system has very high antijamming capability.Signal transmission is carried out using coaxial cable, can be very
Influence of the external interference to signal must be suppressed well, the antijamming capability of circuit system is substantially increased.
This circuit system can export direct current and pulse current.
In DC operation, with the difference of loading demand voltage, the voltage that constant pressure source is provided is according to the actual need of load
Real-time change is sought, in the change procedure of voltage, remains that the voltage on constant-current source power tube is constant, reaches in wider model
Enclose automatically adjusting for interior voltage.Maximum working voltage 200V, maximum supply current can reach 15A, can cover substantially conventional
The current requirements of semiconductor laser.For the electric current set, different loads are changed, electric current keeps constant.
When to Constant current input external pulse control signal, for example, input 1kHz, dutycycle is believed for 50% square wave
Number, then the electric current of constant-current source output is exactly 1kHz, and dutycycle is 50% electric current.Constant-current source is in pulsed operation, constant current
Ource electric current rising edge of a pulse quickly, can be reached within 1us, within 1us, and the driving current of semiconductor laser can be from 0A
15A is risen to, without current over pulse, the frequency maximum of modulated signal can arrive 50kHz, and dutycycle is adjustable from 10% to 100%.
In the constant-current source course of work, the electric current of noise spectra of semiconductor lasers, voltage, temperature are gathered in real time, run into abnormal conditions,
Rapid to close constant pressure source, constant-current source is stopped power supply to semiconductor laser, effectively the safety of protection semiconductor laser.
It is described above, only the utility model preferably embodiment, but protection domain of the present utility model is not
This is confined to, any one skilled in the art can readily occur in the technical scope that the utility model is disclosed
Change or replacement, should all cover within protection domain of the present utility model.
Claims (9)
1. a kind of constant-current source circuit for semiconductor laser, it is characterised in that：It is adaptive including constant pressure source, constant-current source and voltage
Answer circuit；
The input of the constant pressure source is connected with communication power supply；Output end connects one end of semiconductor laser；
The constant-current source includes amplifier 1, amplifier 2, metal-oxide-semiconductor 2 and current sampling resistor；
One end connection semiconductor that the output end of the amplifier 1 is connected in the grid of metal-oxide-semiconductor 2, the source electrode and drain electrode of metal-oxide-semiconductor 2 swashs
The other end in the other end of light device, the source electrode and drain electrode of metal-oxide-semiconductor 2 connects one end of current sampling resistor；Current sampling resistor
The other end ground connection；The current feedback that current sampling resistor is adopted to amplifier 2, the output end of amplifier 2 connects the input of amplifier 1；
The voltage adaptive is electrically connected between constant-current source and constant pressure source.
2. constant-current source circuit according to claim 1, it is characterised in that：The voltage adaptive circuit includes amplifier 3, fortune
Put 4 and amplifier 5；The voltage that the amplifier 3 is used between the source electrode of differential amplification metal-oxide-semiconductor 2 and drain electrode, the output of amplifier 3 is connected to
The reverse input end of amplifier 4；The positive input of the amplifier 4 inputs a fixed voltage, after the differential amplification of amplifier 4
Voltage pass through the voltage follow of amplifier 5 again；The control voltage input of the output of the amplifier 5 connection constant pressure source.
3. constant-current source circuit according to claim 1, it is characterised in that：The constant-current source also include mode of operation selection and
Size of current adjusts circuit；The mode of operation selection and size of current regulation circuit include analog switch 1, analog switch 2, three
Pole pipe T, resistance R1~R4；
The output end of the analog switch 1 passes through resistance by resistance R1 connecting triodes T colelctor electrode, the analog switch 2
R2 connecting triodes T base stage, triode T grounded emitters, the colelctor electrode of triode also passes through the defeated of resistance R3 connections amplifier 1
Enter end, one end of the resistance R4 is connected between resistance R3 and the input of amplifier 1, resistance R4 other ends ground connection；Analog switch 1
Input signal control constant-current source size of current signal and inside to automatically control constant-current source high low signal for external hand；Simulation is opened
It is control constant-current source switching signal and external pulse control signal to close 2 input signal.
4. the constant-current source circuit according to claim 1 or 3, it is characterised in that：In the output end and metal-oxide-semiconductor 2 of the amplifier 1
Grid between be provided with rise-time of current accelerating circuit；The rise-time of current accelerating circuit include electric capacity C1, electric capacity C2 and
Resistance R5；It is connected in parallel on after electric capacity C2 and resistance the R5 series connection with electric capacity C1 between the grid of the output end of amplifier 1 and metal-oxide-semiconductor 2.
5. constant-current source circuit according to claim 1, it is characterised in that：Also include metal-oxide-semiconductor 1 and thermal-shutdown circuit；
The metal-oxide-semiconductor 1 is connected between constant pressure source and semiconductor laser, and the grid of metal-oxide-semiconductor 1 connects+5V voltages, drain electrode and source electrode
In one end be connected with constant pressure source output terminal, drain electrode and source electrode in the other end be connected with one end of semiconductor laser；
The thermal-shutdown circuit includes thermistor, voltage collector 1, voltage comparator 1, the diode 1 of negative temperature coefficient；
The voltage that the thermistor is used on the temperature for gathering semiconductor laser, the collection thermistor of voltage collector 1, voltage is adopted
Voltage comparator 1 described in the control source that storage 1 is gathered, the negative pole of the output connection diode of voltage comparator 1, diode is just
One end that pole connection metal-oxide-semiconductor 1 is connected with constant pressure source.
6. constant-current source circuit according to claim 5, it is characterised in that：Also include current foldback circuit, the excessively stream is protected
Protection circuit includes voltage collector 2, amplifier 6, voltage comparator 2, diode 2；The voltage collector 2 is adopted for gathering electric current
The voltage at sample resistance two ends；Voltage collector collection voltages amplify input voltage comparator 2 through amplifier 6；Voltage comparator 2 is exported
The negative pole of diode 2 is connected, the positive pole of diode 2 connects one end that metal-oxide-semiconductor 1 is connected with constant pressure source.
7. the constant-current source circuit according to claim 5 or 6, it is characterised in that：Also include overvoltage crowbar, the overvoltage
Protection circuit includes voltage collector 3, amplifier 7, voltage comparator 3, diode 3；The voltage collector, which is used to gather, partly leads
The voltage at body laser two ends；Input voltage comparator 3 after voltage collector collection voltages reduce through amplifier 7；Voltage comparator 3
The negative pole of output connection diode 3, the positive pole of diode 3 connects one end that metal-oxide-semiconductor 1 is connected with constant pressure source.
8. constant-current source circuit according to claim 1, it is characterised in that：The metal-oxide-semiconductor 2 is the field-effect that TO-247 is encapsulated
Pipe, the current sampling resistor temperature drift is 20ppm.
9. constant-current source circuit according to claim 1, it is characterised in that：The constant-current source circuit is integrated on circuit boards,
It is 2 ounces that the circuit board, which applies copper thickness,；Circuit board copper pad surface turmeric.
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| CN201720067484.0U CN206516893U (en) | 2017-01-18 | 2017-01-18 | A kind of constant-current source circuit for semiconductor laser |
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| CN201720067484.0U CN206516893U (en) | 2017-01-18 | 2017-01-18 | A kind of constant-current source circuit for semiconductor laser |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107565913A (en) * | 2017-10-26 | 2018-01-09 | 井冈山电器有限公司 | A kind of protection circuit |
| CN108712807A (en) * | 2018-08-03 | 2018-10-26 | 江西美的贵雅照明有限公司 | The driving circuit of light emitting diode |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
| CN109613952A (en) * | 2018-12-26 | 2019-04-12 | 长春昌鼎电子科技有限责任公司 | A kind of loaded self-adaptive constant current generation circuit |
| CN109739289A (en) * | 2019-02-21 | 2019-05-10 | 福建星云电子股份有限公司 | A kind of shared metal-oxide-semiconductor voltage stabilization and current stabilization bipolar circuitry |
| CN113036588A (en) * | 2021-03-12 | 2021-06-25 | 深圳市星汉激光科技股份有限公司 | Semiconductor laser pumping source driving current dynamic adjusting system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565913A (en) * | 2017-10-26 | 2018-01-09 | 井冈山电器有限公司 | A kind of protection circuit |
| CN107565913B (en) * | 2017-10-26 | 2024-02-02 | 井冈山电器有限公司 | Protection circuit |
| CN108712807A (en) * | 2018-08-03 | 2018-10-26 | 江西美的贵雅照明有限公司 | The driving circuit of light emitting diode |
| CN108712807B (en) * | 2018-08-03 | 2024-01-09 | 美智光电科技股份有限公司 | Driving circuit of light emitting diode |
| CN108925004A (en) * | 2018-08-08 | 2018-11-30 | 深圳世鸿智汇科技有限公司 | LED drive system |
| CN109613952A (en) * | 2018-12-26 | 2019-04-12 | 长春昌鼎电子科技有限责任公司 | A kind of loaded self-adaptive constant current generation circuit |
| CN109739289A (en) * | 2019-02-21 | 2019-05-10 | 福建星云电子股份有限公司 | A kind of shared metal-oxide-semiconductor voltage stabilization and current stabilization bipolar circuitry |
| CN109739289B (en) * | 2019-02-21 | 2023-12-05 | 福建星云电子股份有限公司 | Voltage and current stabilizing bipolar circuit for shared MOS tube |
| CN113036588A (en) * | 2021-03-12 | 2021-06-25 | 深圳市星汉激光科技股份有限公司 | Semiconductor laser pumping source driving current dynamic adjusting system |
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