CN102723658B - Constant current source power supplying circuit of laser - Google Patents
Constant current source power supplying circuit of laser Download PDFInfo
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- CN102723658B CN102723658B CN 201210120473 CN201210120473A CN102723658B CN 102723658 B CN102723658 B CN 102723658B CN 201210120473 CN201210120473 CN 201210120473 CN 201210120473 A CN201210120473 A CN 201210120473A CN 102723658 B CN102723658 B CN 102723658B
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Abstract
The invention discloses a constant current source power supplying circuit of a laser, which is mainly used in the field of tunable laser and is capable of providing a highly stable power supplying current of a laser. The constant current source power supplying circuit comprises a voltage controlled input end, a voltage controlled constant current source circuit, a current output end, and a positive feedback circuit, wherein the positive feedback circuit includes a voltage follower, an input end of the voltage follower is connected with the current output end, an output end of the voltage follower is connected with a non-inverting input end of a first operational amplifier. A control voltage is inputted from the voltage controlled input end, the magnitude of the power supplying current of the laser outputted by the current output end is controlled through the voltage controlled constant current source circuit, when the control voltage jumps, the voltage of the non-inverting input end of the first operational amplifier is controlled by the power supplying current through the positive feedback circuit for a smooth transition in the direction of the control voltage. Under the action that a negative feedback speed of the voltage controlled constant current source circuit is faster than a positive feedback speed of the same, the power supplying current changes to a current value setby the control voltage smoothly.
Description
Technical field
The present invention relates to a kind of power supply circuits, especially relate to a kind of constant current source power supply circuit of laser.
Background technology
In the tunable laser field, need provide the stable high-precision current source that reaches for laser, the output of this current source can not have heavy current impact, and the correcting current data of the unusual and collection current source in palpus energy monitor current source.
In the prior art, adopt circuit as shown in Figure 1 to provide adjustable constant current for laser, this laser constant-current source circuit comprises voltage controlled current source circuit 1, charge-discharge circuit 2 and supervisory circuit 3; Voltage controlled current source circuit 1 is mainly formed voltage controlled current source circuit commonly used by operational amplifier U1-A and metal-oxide-semiconductor U4, from voltage-controlled input V
SETThe control voltage of input changes the grid voltage of N-channel MOS pipe U4 by degenerative operational amplifier U1-A, the channel width of control metal-oxide-semiconductor U4, to reach the purpose that changes the output current size, and because degenerative effect, the supply current of voltage controlled current source circuit 1 output can be exported by the value that control voltage sets, and access current-limiting resistance R3 between the grid of the output of operational amplifier U1-A and metal-oxide-semiconductor U4, and cooperate the charge-discharge circuit of being formed by delay capacitor C1 2, can prevent when powering on, operational amplifier U1-A output output HIGH voltage, make the impedance of metal-oxide-semiconductor U4 drain-source too small, big electric current of voltage controlled current source circuit 1 output is given load; Supervisory circuit 3 adopts operational amplifier U1-C, resistance R 9 and capacitor C 3 to form, and the supply current of voltage controlled current source circuit 1 output of can sampling converts voltage at voltage monitoring end V
MONExport, the correcting current data of current source are provided for the back level.
There is following defective in laser constant-current source circuit shown in Figure 1: when the control voltage generation saltus step of voltage-controlled input VSET input, because its magnitude of voltage changes too fast to the charge or discharge of capacitor C 1 greatly, thereby form big electric current, be subjected to the supply current of its control laser constant-current source circuit output the process that an overshoot is adjusted back can occur, laser as load can be subjected to heavy current impact, influences the performance of laser.
Summary of the invention
The constant current source power supply circuit that the purpose of this invention is to provide a kind of laser can provide stability high laser supply current.
The objective of the invention is to realize by following technical measures:
A kind of constant current source power supply circuit of laser, comprise voltage-controlled input, voltage controlled current source circuit and current output terminal, described voltage-controlled input is connected with the in-phase input end of first operational amplifier in the voltage controlled current source circuit, described current output terminal is connected with the source electrode of metal-oxide-semiconductor in the voltage controlled current source circuit, control voltage is imported from voltage-controlled input, size by described voltage controlled current source circuit control current output terminal output laser supply current, described laser constant-current source circuit also is provided with regenerative circuit, described regenerative circuit comprises voltage follower, the input of voltage follower is connected with described current output terminal, and the output of voltage follower is connected to the in-phase input end of described first operational amplifier; When control voltage generation saltus step, described supply current is controlled the first operational amplifier in-phase input end by regenerative circuit voltage seamlessly transits to the control voltage direction, described supply current is under the effect of voltage controlled current source circuit negative feedback speed faster than positive feedback speed, and smooth change is to the current value that sets of control voltage.
In order to protect the load of constant current source power supply circuit of the present invention; described constant current source power supply circuit also is provided with charge-discharge circuit; described charge-discharge circuit comprises first electric capacity and current-limiting resistance; described resistance is connected between the grid of the output of first operational amplifier and metal-oxide-semiconductor, and described first electric capacity is connected between the grid of the inverting input of first operational amplifier and metal-oxide-semiconductor.
Preferably, described voltage controlled current source circuit is provided with first resistance, second resistance, the 3rd resistance and the 4th resistance for the described first operational amplifier sending-end impedance of balance; First resistance is connected between the in-phase input end of described voltage-controlled input and first operational amplifier, the 3rd resistance is connected between the output of the in-phase input end of described first operational amplifier and voltage follower, the inverting input of described first operational amplifier is by second grounding through resistance, and the 4th resistance is connected between the source electrode of the inverting input of described first operational amplifier and metal-oxide-semiconductor.
Described laser constant-current source circuit also is provided with for the supervisory circuit of gathering laser constant-current source circuit correcting current data; Preferably, described supervisory circuit comprises monitoring output, first sampling resistor, second sampling resistor, second operational amplifier, triode, the 5th resistance, the 6th resistance and second electric capacity; Described second sampling resistor is connected between the source electrode of described current output terminal and metal-oxide-semiconductor, described first sampling resistor is connected between the inverting input of the source electrode of metal-oxide-semiconductor and second operational amplifier, the in-phase input end of described second operational amplifier is connected to described current output terminal, the output of described second operational amplifier is connected to the base stage of triode, the emitter of described triode is connected to the inverting input of second operational amplifier, the collector electrode of described triode is leaded up to the 5th grounding through resistance, by the 6th resistance and second capacity earth, the tie point of described the 6th resistance and second electric capacity is connected to the monitoring output successively on another road.
Compared with prior art, laser constant-current source circuit of the present invention has following beneficial effect:
Laser constant-current source circuit of the present invention has additional regenerative circuit, when control signal generation voltage jump, supply current carries out positive feedback by this regenerative circuit to the first operational amplifier in-phase input end, the voltage of controlling the first operational amplifier in-phase input end seamlessly transits to the control voltage direction, include voltage follower because of this regenerative circuit simultaneously, the positive feedback of being undertaken by regenerative circuit, its speed is slower than the negative feedback speed of voltage controlled current source circuit self, therefore laser constant-current source circuit of the present invention can be under degenerative effect, on the current value that the final stable control voltage of the supply current of output sets, laser constant-current source circuit of the present invention can prevent in the prior art, because of control signal generation voltage jump, the process of overshoot readjustment appears in the supply current of output, avoided big current phenomena, the supply current amplitude of variation of its output is little, can accurately control for laser provides, and the high supply current of current stability.In addition, the present invention can also pass through supervisory circuit, realizes real-time circuit abnormality monitoring and calibration.
Description of drawings
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the circuit theory diagrams of laser constant-current source circuit in the prior art;
Fig. 2 is the circuit theory diagrams of laser constant-current source circuit of the present invention.
Embodiment
As shown in Figure 2, the constant current source power supply circuit of laser of the present invention comprises voltage-controlled input V
SET, voltage controlled current source circuit 1, current output terminal A and regenerative circuit 4, voltage-controlled input V
SETBe connected with the in-phase input end of the first operational amplifier U1-A in the voltage controlled current source circuit 1, current output terminal A is connected with the source electrode of metal-oxide-semiconductor U4 in the voltage controlled current source circuit 1, regenerative circuit 4 comprises voltage follower U1-B, the input of voltage follower U1-B is connected with current output terminal A, and the output of voltage follower U1-B is connected to the in-phase input end of the first operational amplifier U1-A; Control voltage is from voltage-controlled input V
SETInput, size by voltage controlled current source circuit 1 control current output terminal A output laser supply current, when control voltage generation saltus step, supply current seamlessly transits to the control voltage direction by the voltage of the regenerative circuit 4 controls first operational amplifier U1-A in-phase input end, supply current is under 1 effect of negative feedback speed faster than positive feedback speed of voltage controlled current source circuit, and smooth change is to the current value that sets of control voltage.
Wherein, in order to protect the load of constant current source power supply circuit of the present invention; prevent that sudden change from appearring in metal-oxide-semiconductor U4 grid voltage; make the constant supply current that offers load rush of current occur; the constant current source power supply circuit of above-mentioned laser also is provided with charge-discharge circuit 2; described charge-discharge circuit 2 comprises first capacitor C 1 and current-limiting resistance R3; described resistance R 3 is connected between the grid of the output of the first operational amplifier U1-A and metal-oxide-semiconductor U4, and described first capacitor C 1 is connected between the grid of the inverting input of the first operational amplifier U1-A and metal-oxide-semiconductor U4.
Above-mentioned voltage controlled current source circuit 1 can be provided for first resistance R 1, second resistance R 2, the 3rd resistance R 4 and the 4th resistance R 5 of the described first operational amplifier U1-A sending-end impedance of balance; First resistance R 1 is connected described voltage-controlled input V
SETAnd between the in-phase input end of the first operational amplifier U1-A, the 3rd resistance R 4 is connected between the output of the in-phase input end of the described first operational amplifier U1-A and voltage follower U1-B, the inverting input of the described first operational amplifier U1-A is by second resistance R, 2 ground connection, and the 4th resistance R 5 is connected between the source electrode of the inverting input of the described first operational amplifier U1-A and metal-oxide-semiconductor U4.
In addition, also be provided with for the supervisory circuit 3 of gathering laser constant-current source circuit correcting current data; Supervisory circuit 3 can adopt following priority circuit to form, and comprises monitoring output V
MON, the first sampling resistor R6, the second sampling resistor R7, the second operational amplifier U1-C, triode Q1-A, the 5th resistance R 8, the 6th resistance R 9 and second capacitor C 3; The second sampling resistor R7 is connected between the source electrode of current output terminal A and metal-oxide-semiconductor U4, the first sampling resistor R6 is connected between the inverting input of the source electrode of metal-oxide-semiconductor U4 and the second operational amplifier U1-C, the in-phase input end of the second operational amplifier U1-C is connected to current output terminal A, the output of the second operational amplifier U1-C is connected to the base stage of triode Q1-A, the emitter of triode Q1-A is connected to the inverting input of the second operational amplifier U1-C, the collector electrode of triode Q1-A is leaded up to the 5th resistance R 8 ground connection, another road is successively by the 6th resistance R 9 and second capacitor C, 3 ground connection, and the tie point of the 6th resistance R 9 and second capacitor C 3 is connected to monitoring output V
MONWherein, the first sampling resistor R6, the second sampling resistor R7, the second operational amplifier U1-C, triode Q1-A constitute current mirror, become fixed proportion I by the electric current of the first sampling resistor R6 with electric current by the second sampling resistor R7
R6/ I
R7=R7/R6.Convert the output voltage V of monitoring output VMON to by the 5th resistance R 8 at image current
MON=I
R7* R8 (I
R7=I
LOAD).
The operation principle of laser constant-current source circuit of the present invention is as follows:
After laser constant-current source circuit of the present invention powers on, control signal is imported from voltage-controlled input VSET, owing to there is not load current to produce at the beginning, be that current output terminal A does not have electric current output, this moment, voltage follower U1-B was output as 0V, and the in-phase input end current potential of the first operational amplifier U1-A is limited in
The output of the first operational amplifier U1-A begins capacitor C 1 charging by current-limiting resistance R3, and charging can cause the first operational amplifier U1-A amplifier's inverting input change in voltage, thereby make the first operational amplifier U1-A output end voltage toward the change in voltage of setting, capacitor C 1 voltage progressively rises to the magnitude of voltage that sets simultaneously, the grid voltage of metal-oxide-semiconductor U4 is smoothly risen, and have electric current to flow out to source electrode from the drain electrode of metal-oxide-semiconductor U4 simultaneously, and through resistance R 5 and resistance R 2 inflow commons, this electric current produces the voltage negative feedback voltage by resistance R 2 and gives the first operational amplifier U1-A, make the operational amplifier U1-A output of winning to the change in voltage of setting, but under electric current did not meet the requirements of situation, capacitor C 1 still can continue charging.In this process, voltage follower U1-B input terminal voltage also can change, and causes the positive terminal voltage of the first operational amplifier U1-A progressively to rise.But because positive feedback could arrive the first operational amplifier U1-A behind a voltage follower U1-B, so negative feedback speed is faster, causing the first operational amplifier U1-A output end voltage totally is progressively to change to the electric current that sets, just satisfy the current value that sets up to dropping to metal-oxide-semiconductor U4 opening degree, the first operational amplifier U1-A in-phase input end voltage no longer rises.Wherein, resistance R 3 is controlled the speed that the capacitor C 1 of the first operational amplifier U1-A discharges and recharges.When control voltage when needing supply current to diminish, big the same of its principle and above-mentioned change, just capacitor C 1 is discharge, the in-phase input end voltage of regenerative circuit 4 increases by the first operational amplifier U1-A is so give unnecessary details no longer one by one at this.
According to foregoing, ordinary skill knowledge and customary means according to this area, do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite, the present invention can also make equivalent modifications, replacement or the change of other various ways, select for use operational amplifier to form or adopt in the prior art other circuit with identical electrical characteristic to substitute as above-mentioned voltage follower U1-B, supervisory circuit 3 adopts in the prior aries other current sample modes etc., all can realize the object of the invention.
Claims (1)
1. the constant current source power supply circuit of a laser comprises voltage-controlled input (V
SET), voltage controlled current source circuit (1) and current output terminal (A), described voltage-controlled input (V
SET) be connected with the in-phase input end of first operational amplifier (U1-A) in the voltage controlled current source circuit (1), described current output terminal (A) is connected with the source electrode of metal-oxide-semiconductor (U4) in the voltage controlled current source circuit (1), and control voltage is from voltage-controlled input (V
SET) input, size by described voltage controlled current source circuit (1) control current output terminal (A) output laser supply current, it is characterized in that: described laser constant-current source circuit also is provided with regenerative circuit (4), described regenerative circuit (4) comprises voltage follower (U1-B), the input of voltage follower (U1-B) is connected with described current output terminal (A), and the output of voltage follower (U1-B) is connected to the in-phase input end of described first operational amplifier (U1-A); When control voltage generation saltus step, described supply current seamlessly transits to the control voltage direction by the voltage of regenerative circuit (4) control first operational amplifier (U1-A) in-phase input end, described supply current is under the effect of voltage controlled current source circuit (1) negative feedback speed faster than positive feedback speed, and smooth change is to the current value that sets of control voltage;
Described constant current source power supply circuit also is provided with charge-discharge circuit (2), described charge-discharge circuit (2) comprises first electric capacity (C1) and current-limiting resistance (R3), described resistance (R3) is connected between the grid of the output of first operational amplifier (U1-A) and metal-oxide-semiconductor (U4), and described first electric capacity (C1) is connected between the grid of the inverting input of first operational amplifier (U1-A) and metal-oxide-semiconductor (U4);
Described voltage controlled current source circuit (1) is provided with for first resistance (R1) of described first operational amplifier of balance (U1-A) sending-end impedance, second resistance (R2), the 3rd resistance (R4) and the 4th resistance (R5); First resistance (R1) is connected described voltage-controlled input (V
SET) and the in-phase input end of first operational amplifier (U1-A) between, the 3rd resistance (R4) is connected between the output of the in-phase input end of described first operational amplifier (U1-A) and voltage follower (U1-B), the inverting input of described first operational amplifier (U1-A) is by second resistance (R2) ground connection, and the 4th resistance (R5) is connected between the source electrode of the inverting input of described first operational amplifier (U1-A) and metal-oxide-semiconductor (U4);
Described laser constant-current source circuit also is provided with for the supervisory circuit (3) of gathering laser constant-current source circuit correcting current data, and described supervisory circuit (3) comprises monitoring output (V
MON), first sampling resistor (R6), second sampling resistor (R7), second operational amplifier (U1-C), triode (Q1-A), the 5th resistance (R8), the 6th resistance (R9) and second electric capacity (C3); Described second sampling resistor (R7) is connected between the source electrode of described current output terminal (A) and metal-oxide-semiconductor (U4), described first sampling resistor (R6) is connected between the inverting input of the source electrode of metal-oxide-semiconductor (U4) and second operational amplifier (U1-C), the in-phase input end of described second operational amplifier (U1-C) is connected to described current output terminal (A), the output of described second operational amplifier (U1-C) is connected to the base stage of triode (Q1-A), the emitter of described triode (Q1-A) is connected to the inverting input of second operational amplifier (U1-C), the collector electrode of described triode (Q1-A) is leaded up to the 5th resistance (R8) ground connection, another road is successively by the 6th resistance (R9) and second electric capacity (C3) ground connection, and the tie point of described the 6th resistance (R9) and second electric capacity (C3) is connected to monitoring output (V
MON).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210120473 CN102723658B (en) | 2012-04-23 | 2012-04-23 | Constant current source power supplying circuit of laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210120473 CN102723658B (en) | 2012-04-23 | 2012-04-23 | Constant current source power supplying circuit of laser |
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| CN102723658A CN102723658A (en) | 2012-10-10 |
| CN102723658B true CN102723658B (en) | 2013-09-25 |
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| CN 201210120473 Expired - Fee Related CN102723658B (en) | 2012-04-23 | 2012-04-23 | Constant current source power supplying circuit of laser |
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Families Citing this family (6)
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| CN102957089B (en) * | 2012-11-12 | 2014-09-10 | 华南理工大学 | Drive circuit of coaxial pigtail laser |
| CN103687234A (en) * | 2013-12-14 | 2014-03-26 | 成都国蓉科技有限公司 | Voltage controlled constant current source circuit with good stability |
| CN104469220B (en) * | 2014-09-17 | 2017-07-11 | 广州视源电子科技股份有限公司 | Linear regulation output voltage circuit and television |
| CN106774586B (en) * | 2017-03-27 | 2018-04-03 | 深圳怡化电脑股份有限公司 | Constant-current control circuit and self-service withdrawal equipment for photoelectric sensor |
| 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 |
| CN113498227A (en) * | 2021-07-09 | 2021-10-12 | 西安和其光电科技股份有限公司 | Adjustable microampere constant current source circuit, excitation light source and control method thereof |
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|---|---|---|---|---|
| US5589759A (en) * | 1992-07-30 | 1996-12-31 | Sgs-Thomson Microelectronics S.R.L. | Circuit for detecting voltage variations in relation to a set value, for devices comprising error amplifiers |
| CN2351780Y (en) * | 1998-05-27 | 1999-12-01 | 洛阳一方高科技研究中心 | Apparatus for stabilizing electric current and power source |
| CN101763134A (en) * | 2010-02-02 | 2010-06-30 | 浙江南瑞科技有限公司 | Parallel voltage stabilizing circuit |
| CN101777760A (en) * | 2010-03-05 | 2010-07-14 | 厦门大学 | Laser power supply overcurrent protection circuit with locking function |
-
2012
- 2012-04-23 CN CN 201210120473 patent/CN102723658B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5589759A (en) * | 1992-07-30 | 1996-12-31 | Sgs-Thomson Microelectronics S.R.L. | Circuit for detecting voltage variations in relation to a set value, for devices comprising error amplifiers |
| CN2351780Y (en) * | 1998-05-27 | 1999-12-01 | 洛阳一方高科技研究中心 | Apparatus for stabilizing electric current and power source |
| CN101763134A (en) * | 2010-02-02 | 2010-06-30 | 浙江南瑞科技有限公司 | Parallel voltage stabilizing circuit |
| CN101777760A (en) * | 2010-03-05 | 2010-07-14 | 厦门大学 | Laser power supply overcurrent protection circuit with locking function |
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