CN114899701A - Digital control double closed loop semiconductor laser driving power supply - Google Patents
Digital control double closed loop semiconductor laser driving power supply Download PDFInfo
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- CN114899701A CN114899701A CN202210817799.8A CN202210817799A CN114899701A CN 114899701 A CN114899701 A CN 114899701A CN 202210817799 A CN202210817799 A CN 202210817799A CN 114899701 A CN114899701 A CN 114899701A
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- power supply
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/157—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with digital control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Power Engineering (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses a digital control double closed-loop semiconductor laser driving power supply, which belongs to the technical field of design power supplies and comprises an amplifier, a power supply and a power supply control circuit, wherein the amplifier is used for collecting the actual current of a laser LD1 and comparing the actual current with the current difference value set by a DC power supply; the amplifier consists of an amplifier U1A for primary signal amplification and an amplifier U1B for error amplification; the output end of the amplifier is connected with a voltage and current controller for adjusting the voltage and the current of the laser; by applying the invention, the defects of a laser driving power supply, narrow output adaptive range, high power consumption of an adjusting tube, low efficiency and the like are effectively avoided.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a drive power supply for a digitally-controlled double-closed-loop semiconductor laser.
Background
In a laser driving power supply, two regulation schemes of switching and linearity are commonly adopted, and the switching power supply has high efficiency, wide self-adaptive range, poor dynamic characteristic and large current ripple; the linear power supply has low current ripple and good dynamic transient characteristics, but the output adaptive range is narrow, the power consumption of the adjusting tube is large, and the efficiency is low. The performance of the laser is reduced or damaged due to large current ripples and poor dynamic characteristics, so that a power supply with excellent performance needs to be designed to ensure the safe and stable operation of the laser.
In the application with higher requirements on current ripple and dynamic response, a current linear regulation method is often adopted, and the current common method comprises the following steps:
1. pure hardware circuitry: an analog control method is adopted, a current closed loop is formed by utilizing depth negative feedback formed by an adjusting tube and an operational amplifier, the current closed loop has high current stability, but the current stability is easily influenced by devices, temperature and the like, the voltage self-adaption range is narrow, the current adjustment is inconvenient, and the method is often applied to a specific laser;
2. the singlechip control circuit: the laser can feed back voltage and current information, monitor the working state of the laser in real time, and can quickly protect the laser when abnormal, but the current common single closed-loop strategy (voltage or current) cannot solve the problems of low efficiency, narrow adaptive range and the like of a linear laser driving power supply, and particularly, when the voltage is output in a wider range and the current is changed, the dynamic response of the current is longer.
Disclosure of Invention
The present invention is directed to a driving power supply for a digitally controlled double closed loop semiconductor laser, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a digital control double closed loop semiconductor laser driving power supply,
the digital control double closed loop semiconductor laser driving power supply comprises an amplifier for collecting the actual current of a laser LD1 and comparing the actual current with the current difference set by a DC power supply;
the amplifiers include an amplifier U1A for primary signal amplification and an amplifier U1B for error amplification;
the output end of the amplifier is connected with a voltage and current controller for adjusting the voltage and the current of the laser;
the input end of the amplifier is connected with a DC power supply and a laser LD 1;
the DC power supply, the amplifier and the voltage-current controller form a voltage-current double closed loop.
As a further technical scheme of the invention: the input end + of the amplifier U1B is connected with a resistor R4, the other end of the resistor R4 is connected with an Iset port of a DC power supply, the input end-connecting resistor R6, a resistor R7 and a capacitor C8 of the amplifier U1B, the other end of the resistor R6 is connected with a resistor R3, the output end of the amplifier U1A and an Isense port of the DC power supply, the other end of the resistor R3 is connected with a capacitor C2 and a capacitor C4, the input end of the amplifier U1A and the GND port of the DC power supply, the output end of the amplifier U1B is connected with the other ends of the resistor R5 and the resistor R7 and the other end of the capacitor C8, the other end of the resistor R5 is connected with the grid electrode of the MOS tube V1, the source electrode of the MOS tube V1 is connected with the resistor R1 and the resistor R5, the other end of the resistor R5 is connected with the input end of the amplifier U1A, the other end of the capacitor C2 and the capacitor C3, the other end of the resistor R1 is grounded, the other end of the capacitor C3 is grounded, the other end of the capacitor C4 is grounded, and the drain electrode of the MOS tube V1 is connected with the laser LD 1.
As a further technical scheme of the invention: two ends of the laser LD1 are respectively connected with a VLD1 port of a DC power supply and a VOUT port of the DC power supply.
As a further technical scheme of the invention: the MOS tube V1 is a P-MOS tube.
As a further technical scheme of the invention: the MOS tube V1 is replaced by a plurality of groups of MOS tubes in parallel.
Compared with the prior art, the invention has the beneficial effects that:
by applying the invention, the defects of a laser driving power supply, narrow output adaptive range, high power consumption of an adjusting tube, low efficiency and the like are effectively avoided.
Drawings
Fig. 1 is a circuit diagram of the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1, a digitally controlled dual closed loop semiconductor laser driving power supply includes an amplifier, a voltage-current controller and a DC power supply,
the amplifier is respectively connected with the DC power supply and the voltage and current controller, and is used for acquiring the actual current of the laser, comparing the actual current with a set current difference value, and simultaneously outputting a comparison result to the voltage and current controller; the voltage and current controller is connected with the laser and is used for adjusting the voltage and the current of the laser; and the DC power supply is used for sampling the current and the voltage of the laser LD1 to realize a voltage and current double closed loop. Make this design can adjust DC mains voltage according to laser LD1 operating voltage, through the voltage closed loop, make the adjustment tube work in low-power consumption state, possess the switching power supply advantage: wide-range self-adaptive output voltage, high efficiency and adaptability to various loads.
Embodiment 2, on the basis of embodiment 1, the amplifier includes an amplifier U1A and an amplifier U1B. The voltage-current controller comprises a MOS transistor V1 and a resistor R1. An input end + of the amplifier U1B is connected with a resistor R4, the other end of the resistor R4 is connected with an Iset port of a DC power supply, an input end-of the amplifier U1B is connected with a resistor R B, a resistor R B and a capacitor C B, the other end of the resistor R B is connected with a resistor R B, an output end of the amplifier U1B and an Isense port of the DC power supply, the other end of the resistor R B is connected with a capacitor C B, an input end-of the amplifier U1B and a GND port of the DC power supply, an output end of the amplifier U1B is connected with a resistor R B, the other end of the resistor R B and the other end of the capacitor C B, the other end of the resistor R B is connected with a grid of a MOS tube V B, a source of the MOS tube V B is connected with a resistor R B and a resistor R B, the other end of the resistor R B is connected with a drain of the other end of the capacitor C B, the drain of the resistor D B is grounded, the other end of the LD of the laser diode LD is connected with the LD B, two ends of the laser LD1 are respectively connected with a VLD1 port of a DC power supply and a VOUT port of the DC power supply, and the MOS tube V1 is a P-MOS tube.
The DC power supply is a digital control LLC power supply, and voltage and circuit double closed loops are realized by sampling current and voltage of the laser.
The low-temperature drift resistor R1 samples the working current of the laser, the difference and filter circuit composed of the resistor R2, the resistor R5, the capacitor C2, the capacitor C3 and the capacitor C4 is amplified by the amplifier U1A and then used as the input of the amplifier U1B to carry out error amplification with the current Iset preset by a DC power supply, the output voltage value of the difference and filter circuit is used for controlling the output current of the MOS tube V1 to complete current control, and the C8 is used for inhibiting high-frequency oscillation.
In order to reduce the power consumption of the MOS (V1 drain-source voltage (VLD 1) is stabilized at 0.2V, the drain-source voltage can be further reduced by connecting a plurality of groups of MOS tubes in parallel, and the voltage of a DC power supply is adjusted by the singlechip in real time according to the working voltage of the laser to form a voltage closed loop; and the singlechip calculates and compares the difference between the actual current (Isense) and the set current (Iset) of the laser, adjusts the current reference, and completes the current compensation adjustment (working temperature, difference caused by temperature drift of the device). When the working voltage of the laser is wide and the set current is changed, in order to ensure that the current quickly rises or falls, the output voltage of the DC power supply is intelligently set according to the comparison between the current set at this time and the current set at the last time, and after the current reaches a target value, the voltage of the DC power supply is quickly reduced to keep the low power consumption of the MOS. The laser adopts a voltage and current double closed-loop control strategy to effectively control the working state of the laser, and compared with the traditional scheme, the current dynamic performance and precision are greatly improved, so that the laser can be widely applied to various constant current circuits.
The working principle is as follows, with reference to the flow chart of fig. 2, wherein Iset1 represents the laser actual current; iset0 represents the last set current difference, first power up Iset0= 0; vo represents the DC power supply output voltage; vmax represents the DC supply maximum output voltage; VLD1 represents the V1 drain voltage sample; isense represents the load operating current sample.
The DC power supply is a digital control switch power supply, and the current and the voltage of the laser are sampled to realize a voltage and current double closed loop. According to the working voltage of the laser, the single chip microcomputer sets the DC power supply voltage in real time, the power consumption of the MOS tube is reduced (V1 drain-source voltage VLD1 is stabilized at 0.2V, and the drain-source voltage can be further reduced by connecting a plurality of groups of MOS tubes in parallel), and a voltage closed loop is formed; and comparing the actual current Iset1 of the laser with the set current difference Iset0, and adjusting the current reference in real time by the singlechip to keep the error value at a smaller value so as to form a current closed loop. When the working voltage of the laser is wide and the set current is changed, in order to ensure that the current quickly rises or falls, the output voltage of the DC power supply is intelligently set according to the comparison between the current set at this time and the current set at the last time, and after the current reaches a target value, the voltage of the DC power supply is quickly reduced to keep the low power consumption of the MOS. The laser adopts a voltage and current double closed-loop control strategy to effectively control the working state of the laser, and compared with the traditional scheme, the current dynamic performance and precision are greatly improved, and the laser is suitable for various constant current circuits.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. A digital control double closed loop semiconductor laser driving power supply is characterized in that,
the digital control double closed loop semiconductor laser driving power supply comprises an amplifier for collecting the actual current of a laser LD1 and comparing the actual current with the current difference set by a DC power supply;
the amplifiers include an amplifier U1A for primary signal amplification and an amplifier U1B for error amplification;
the output end of the amplifier is connected with a voltage and current controller for adjusting the voltage and the current of the laser;
the input end of the amplifier is connected with a DC power supply and a laser LD 1;
the DC power supply, the amplifier and the voltage-current controller form a voltage-current double closed loop.
2. The digitally-controlled double closed-loop semiconductor laser driving power supply according to claim 1, wherein an input terminal + of the amplifier U1B is connected with a resistor R4, the other terminal of the resistor R4 is connected with an Iset port of a DC power supply, an input terminal-of the amplifier U1B is connected with a resistor R6, a resistor R7 and a capacitor C8, the other terminal of a resistor R6 is connected with a resistor R3, an output terminal of the amplifier U1A and an Isense port of the DC power supply, the other terminal of the resistor R3 is connected with a capacitor C2, a capacitor C4, an input terminal-of the amplifier U1A and a GND port of the DC power supply, an output terminal of the amplifier U1B is connected with a resistor R5, the other terminal of the resistor R7 and the other terminal of the capacitor C8, the other terminal of the resistor R5 is connected with a gate of a MOS tube V5, a source of the MOS tube V5 is connected with a resistor R5 and a resistor R5, and the other terminal of the input terminal of the amplifier U1 5 is connected with the other terminal of the capacitor C5 and the capacitor C5, the other end of the resistor R1 is grounded, the other end of the capacitor C3 is grounded, the other end of the capacitor C4 is grounded, and the drain of the MOS transistor V1 is connected with the laser LD 1.
3. The digitally-controlled dual closed-loop semiconductor laser driving power supply of claim 2, wherein both ends of said laser LD1 are connected to the VLD1 port of the DC power supply and the VOUT port of the DC power supply, respectively.
4. A digitally controlled double closed loop semiconductor laser driving power supply as claimed in claim 3 wherein said MOS transistor V1 is a P-MOS transistor.
5. A digitally controlled double closed loop semiconductor laser driving power supply as claimed in claim 4 wherein said MOS transistors V1 are replaced by multiple groups of MOS transistors in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817799.8A CN114899701B (en) | 2022-07-13 | 2022-07-13 | Digital control double closed loop semiconductor laser driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210817799.8A CN114899701B (en) | 2022-07-13 | 2022-07-13 | Digital control double closed loop semiconductor laser driving power supply |
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| CN114899701A true CN114899701A (en) | 2022-08-12 |
| CN114899701B CN114899701B (en) | 2022-11-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004288869A (en) * | 2003-03-20 | 2004-10-14 | Fuji Xerox Co Ltd | Light emitting element driving apparatus |
| CN102447218A (en) * | 2011-11-23 | 2012-05-09 | 武汉长盈通光电技术有限公司 | Laser constant-current control drive circuit |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN210838444U (en) * | 2019-12-24 | 2020-06-23 | 三河市镭科光电科技有限公司 | Laser driving power supply for dynamically tracking and adjusting current and voltage |
| CN212908511U (en) * | 2020-09-04 | 2021-04-06 | 武汉万赢半导体科技有限公司 | Double closed-loop negative feedback control system based on laser |
-
2022
- 2022-07-13 CN CN202210817799.8A patent/CN114899701B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004288869A (en) * | 2003-03-20 | 2004-10-14 | Fuji Xerox Co Ltd | Light emitting element driving apparatus |
| CN102570296A (en) * | 2011-02-25 | 2012-07-11 | 北京国科世纪激光技术有限公司 | Drive circuit of laser diode |
| CN102447218A (en) * | 2011-11-23 | 2012-05-09 | 武汉长盈通光电技术有限公司 | Laser constant-current control drive circuit |
| CN210838444U (en) * | 2019-12-24 | 2020-06-23 | 三河市镭科光电科技有限公司 | Laser driving power supply for dynamically tracking and adjusting current and voltage |
| CN212908511U (en) * | 2020-09-04 | 2021-04-06 | 武汉万赢半导体科技有限公司 | Double closed-loop negative feedback control system based on laser |
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| CN114899701B (en) | 2022-11-08 |
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