CN115360888B - Constant current driving circuit and driving method applied to laser pumping - Google Patents

Constant current driving circuit and driving method applied to laser pumping Download PDF

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Publication number
CN115360888B
CN115360888B CN202211276870.2A CN202211276870A CN115360888B CN 115360888 B CN115360888 B CN 115360888B CN 202211276870 A CN202211276870 A CN 202211276870A CN 115360888 B CN115360888 B CN 115360888B
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transistor
voltage
signal
constant current
module
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CN115360888A (en
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王建廷
刘林
杨俊锋
张振伟
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Shenzhen Lianming Power Supply Co ltd
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Shenzhen Lianming Power Co ltd
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
    • 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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

The invention discloses a constant current driving circuit and a driving method. The main power module converts the initial voltage into an initial compensation voltage and a base voltage according to the first control signal group. And the constant current compensation output module is used for adjusting the initial compensation voltage and the output current of the constant current compensation output module according to the second control signal group and outputting the target compensation voltage to the laser pumping source. The basic voltage output module outputs the basic voltage to the laser pumping source. Compared with the traditional power supply scheme, the circuit structure of the power supply device is reduced from three-level power conversion to two-level power conversion, the efficiency is improved, and the constant current compensation output module is low-voltage output and can work at higher working frequency. The constant-current compensation output module can be subjected to multi-path expansion, and is favorable for meeting the requirements of a multi-path laser pumping module.

Description

Constant current driving circuit and driving method applied to laser pumping
Technical Field
The invention relates to the technical field of power supplies, in particular to a constant current driving circuit and a driving method applied to laser pumping.
Background
The preceding stage power supply structure of the traditional laser pumping module mainly comprises the following components:
the first power supply structure is an AC/DC voltage-stabilized power supply and a linear constant-current driving power supply, and the two power supplies are independent and have relatively large volumes. The AC/DC power supply in the structure outputs stable direct current to input alternating current through the PFC and the isolation DC/DC converter, and provides stable direct current voltage for a post-stage linear constant current driving power supply; the linear constant current driving power supply achieves the purpose of constant current by controlling MOS (metal oxide semiconductor) of the linear constant current driving power supply to work in a linear region. The circuit of the scheme is overall three-stage conversion.
The mode has the advantages of low overall cost, excellent current dynamic characteristic of linear constant current drive and capability of enabling the laser to obtain a wider application working frequency range; the linear constant-current MOS tube has the defects that the loss of the linear constant-current MOS tube is different under different working currents due to the fact that the linear constant-current MOS tube works in a linear region, the integral loss is large, the improvement of the power density of the linear constant-current MOS tube is limited, meanwhile, the integral efficiency is low, the output adaptive range is narrow, and the linear constant-current MOS tube cannot be simultaneously adapted to various laser pumping modules.
The second power supply structure is an AC/DC voltage-stabilized power supply and a BUCK constant-current driving power supply, the two power supplies are independent, and the size is relatively large. The AC/DC Power supply in the structure outputs stable direct current to input alternating current through a PFC (Power Factor Correction) and an isolation DC/DC converter, and provides stable direct current voltage for a later-stage BUCK constant-current driving Power supply; the purpose of constant current is achieved by controlling the output voltage change of the BUCK. The circuit of the scheme is overall three-stage conversion.
The mode has the advantages that the output voltage range of BUCK constant current driving is wide, the BUCK constant current driving can be adaptive to laser pumping modules with different voltage requirements, and meanwhile, the overall efficiency is higher than that of a linear constant current source, so that the overall application efficiency of laser manufacturers is improved; the disadvantage is that the cost is higher compared with the first scheme, and meanwhile, because the BUCK output voltage range is wider and the output voltage is higher (usually more than 50V), the improvement of the working frequency of the high-voltage power MOS (MOSFET, field effect transistor) device is restricted due to the self-reason, which causes the slow response speed of the high-voltage power MOS (MOSFET, field effect transistor) device, so that the application working frequency range of the laser is restricted, and the laser cannot be applied to a high-end high-frequency working scene. The problem of response speed can be compensated by multiplexing and interleaving BUCK, but the overall cost is greatly increased, and the optimal use cannot be achieved.
Therefore, the prior power supply circuit of the traditional laser pumping source cannot ensure the response speed while reducing the cost.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the constant current driving circuit and the driving method are applied to laser pumping, and the problem that a traditional pre-stage power supply circuit of a laser pumping source cannot reduce cost and guarantee response speed is solved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a constant current driving circuit applied to laser pumping comprises: the device comprises a main control module, a main power module, a constant current compensation output module and a basic voltage output module;
the main control module is respectively electrically connected with the main power module and the constant current compensation output module and is used for acquiring a laser control signal sent by a preceding stage circuit, outputting a first control signal group according to the laser control signal, acquiring an average current sampling signal and a peak current sampling signal of the constant current compensation output module, and outputting a second control signal group according to the average current sampling signal and the peak current sampling signal;
the main power module is respectively electrically connected with the constant current compensation output module and the basic voltage output module and is used for acquiring an initial voltage and converting the initial voltage into an initial compensation voltage and a basic voltage according to the first control signal group;
the constant current compensation output module is connected with the basic voltage output module in series and used for acquiring the initial compensation voltage, adjusting the initial compensation voltage and the output current of the constant current compensation output module according to the second control signal group and outputting a target compensation voltage to the laser pump;
the basic voltage output module is used for acquiring the basic voltage and outputting the basic voltage to the laser pump.
Further, the main control module includes:
the first arithmetic unit is electrically connected with the constant current compensation output module and is used for acquiring the laser control signal and the average current sampling signal and acquiring an error current signal according to the laser control signal and the average current sampling signal;
the current loop unit is electrically connected with the first operation unit and is used for operating the error current signal and outputting a target operation result;
a sawtooth wave generating unit for generating a sawtooth wave signal;
the second operation unit is respectively electrically connected with the current loop unit and the sawtooth wave generation unit, and is used for acquiring the sawtooth wave signal and the target operation result and acquiring a reference signal according to the sawtooth wave signal and the target operation result;
the comparison unit is electrically connected with the constant current compensation output module and the second operation unit, and is used for acquiring the peak current sampling signal and the reference signal, comparing the peak current sampling signal with the reference signal and outputting a comparison result; and
and the PWM signal generation unit is electrically connected with the comparison unit and is used for outputting the second control signal group and adjusting the duty ratio of the second control signal group according to the comparison result.
Further, the constant current compensation output module includes: the first sampling resistor, the first BUCK unit, the second BUCK unit, and the first secondary coil and the second secondary coil of the first transformer;
one end of a first secondary coil of the first transformer is connected with the first BUCK unit and the second BUCK unit respectively, one end of a second secondary coil of the first transformer is connected with the first BUCK unit and the second BUCK unit respectively, and the other end of the first secondary coil of the first transformer and the other end of the second secondary coil of the first transformer are grounded;
the main power module is respectively connected with the first secondary coil and the second secondary coil, and the main control module is respectively connected with the first BUCK unit and the second BUCK unit;
the first BUCK unit and the second BUCK unit are connected in parallel in a 90-degree staggered mode, one end of the first sampling resistor is connected with the first BUCK unit and the second BUCK unit respectively, and the other end of the first sampling resistor is grounded.
Further, the first BUCK unit includes: the current sampling transformer comprises a first current sampling transformer, a first transistor, a second transistor and a first inductor;
the input of first current sampling mutual-inductor respectively with the one end of the first secondary of first transformer and the one end of the second secondary of first transformer is connected, the output of first current sampling mutual-inductor with the input of first transistor is connected, the sampling input of first current sampling mutual-inductor with host system connects, the earthing terminal ground connection of first current sampling mutual-inductor, the output of first transistor respectively with first inductance and the input of second transistor is connected, the control end of first transistor with host system connects, the output ground connection of second transistor, the control end of second transistor is connected host system.
Further, the second BUCK unit includes: the current sampling transformer comprises a second current sampling transformer, a third transistor, a fourth transistor and a second inductor;
the input end of the second current sampling mutual inductor is connected with one end of the first secondary coil and one end of the second secondary coil respectively, the output end of the second current sampling mutual inductor is connected with the input end of the third transistor, the sampling input end of the second current sampling mutual inductor is connected with the main control module, the grounding end of the second current sampling mutual inductor is grounded, the output end of the third transistor is connected with the second inductor and the input end of the fourth transistor respectively, the control end of the third transistor is connected with the main control module, the output end of the fourth transistor is grounded, and the control end of the fourth transistor is connected with the main control module.
Further, the main power module includes: a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a primary coil of the first transformer, a primary coil of the second transformer, a third inductor and a capacitor;
the input end of the fifth transistor is connected to the initial voltage, the output end of the fifth transistor is respectively connected to the input end of the sixth transistor and one end of the third inductor, and the control end of the fifth transistor is connected to the main control module;
the output end of the sixth transistor is grounded, and the control end of the sixth transistor is connected with the main control module;
the input end of the seventh transistor is connected to the initial voltage, the output end of the seventh transistor is respectively connected to the input end of the eighth transistor and one end of the capacitor, and the control end of the seventh transistor is connected to the main control module;
the output end of the eighth transistor is grounded, and the control end of the eighth transistor is connected with the main control module;
the other end of the third inductor is connected with one end of the primary coil of the first transformer and one end of the primary coil of the second transformer respectively;
and the other end of the capacitor is respectively connected with the other end of the primary coil of the first transformer and the other end of the primary coil of the second transformer.
Furthermore, the main control module is electrically connected with the basic voltage output module, and is further used for acquiring a voltage sampling signal and a current sampling signal of the basic voltage output module, and adjusting the first control signal group according to the voltage sampling signal and the current sampling signal.
A driving method applied to the constant current driving circuit of any one of the above, the driving method comprising the steps of:
acquiring an initial voltage and a laser control signal;
obtaining a first control signal group according to the laser control signal;
converting the initial voltage into an initial compensation voltage and a base voltage according to the first control signal group;
acquiring a peak current sampling signal and an average current sampling signal of a constant current compensation output module;
adjusting the initial compensation voltage according to the laser control signal, the peak current sampling signal and the average current sampling signal, and obtaining a target compensation voltage;
and outputting the target compensation voltage and the base voltage to a laser pump.
Further, the driving method further includes the steps of:
acquiring a voltage sampling signal and a current sampling signal of the basic voltage output module;
adjusting the first control signal group according to the voltage sampling signal and the current sampling signal.
Further, the adjusting the initial compensation voltage according to the laser control signal, the peak current sampling signal, and the average current sampling signal, and obtaining a target compensation voltage includes:
obtaining an error current signal according to the laser control signal and the average current sampling signal;
calculating the error current signal and outputting a target calculation result;
providing a sawtooth wave signal, and obtaining a reference signal after superposing the target operation result and the sawtooth wave signal;
comparing the reference signal with the peak current sampling signal and outputting a comparison result;
and adjusting the duty ratio of the second control signal group according to the comparison result.
The invention has the beneficial effects that: compared with the traditional power supply scheme of the laser pumping module, the circuit structure of the laser pumping module is reduced from three-level power conversion to two-level power conversion, so that the overall efficiency is correspondingly improved, and the overall size is reduced. The constant current compensation output module is low-voltage output, can adopt a low-voltage MOS tube device with lower cost, and can work at higher working frequency and faster response speed compared with a high-voltage MOS tube device adopted by the traditional scheme. In addition, the series output of the constant current compensation output module and the basic voltage output module can be compatible with laser pumping modules with different voltage requirements. The constant-current compensation output module can be subjected to multi-path expansion, and is favorable for meeting the requirements of a multi-path laser pumping module.
Drawings
Fig. 1 is a schematic block diagram of a constant current driving circuit according to an embodiment of the present invention;
FIG. 2 is a graph of voltage versus current for laser pumping according to a first embodiment of the present invention;
fig. 3 is a schematic block diagram of a main control module according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a constant current driving circuit according to a first embodiment of the invention;
fig. 5 is a schematic diagram of a constant current compensation output module according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of a main power module according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram of a basic voltage output module according to a first embodiment of the present invention;
fig. 8 is a first flowchart of a driving method according to a second embodiment of the present invention;
fig. 9 is a second flowchart of the driving method according to the second embodiment of the invention;
fig. 10 is a third flowchart of the driving method according to the second embodiment of the present invention;
fig. 11 is a fourth flowchart of the driving method according to the second embodiment of the present invention.
Description of the reference symbols:
100. a main control module; 110. a first arithmetic unit; 120. a current loop unit; 130. a sawtooth wave generating unit; 140. a second arithmetic unit; 150. a comparison unit; 160. a PWM signal generation unit; 200. a main power module; 300. a constant current compensation output module; 310. a first BUCK unit; 320. a second BUCK unit; 400. and a base voltage output module.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Example one
Referring to fig. 1 to 7, a first embodiment of the present invention is:
a constant current drive circuit applied to a laser pump is connected with the laser pump and used for supplying power to the laser pump.
Referring to fig. 1, the constant current driving circuit includes: the main control module 100, the main power module 200, the constant current compensation output module 300 and the base voltage output module 400. The main control module 100 is configured to obtain a laser control signal sent by a preceding stage circuit, output a first control signal group according to the laser control signal, obtain an average current sampling signal and a peak current sampling signal of the constant current compensation output module 300, and output a second control signal group according to the average current sampling signal and the peak current sampling signal. The main power module 200 is configured to obtain an initial voltage and convert the initial voltage into an initial compensation voltage and a base voltage according to the first control signal group. The constant current compensation output module 300 is configured to obtain the initial compensation voltage, adjust the initial compensation voltage and the output current thereof according to the second control signal group, and output a target compensation voltage to the laser pump. The basic voltage output module 400 is configured to obtain the basic voltage and output the basic voltage to the laser pump. The main control module 100 is electrically connected to the main power module 200 and the constant current compensation output module 300, the main power module 200 is electrically connected to the constant current compensation output module 300 and the basic voltage output module 400, and the constant current compensation output module 300 is connected to the basic voltage output module 400 in series.
The working principle of the constant current driving circuit applied to the laser pump in the embodiment is as follows: the main control module 100 obtains the laser control signal, and outputs a first control signal group according to the laser control signal, so that the main power module 200 converts the initial voltage into the initial compensation voltage required by the constant current compensation output module 300 and the base voltage required by the base voltage output module 400 according to the first control signal group. The main control module 100 further collects an average current sampling signal and a peak current sampling signal of the constant current compensation output module 300, and outputs a second control signal group according to the average current sampling signal and the peak current sampling signal to adjust the initial compensation voltage, so as to obtain the target compensation voltage. The constant current compensation output module 300 and the base voltage output module 400 are connected in series, and output the target compensation voltage and the base voltage to the laser pump together. The laser control signal is sent by a preceding stage circuit of a constant current driving circuit in the laser system and is a TTL level signal, and the main control module 100 finally adjusts the constant current output of the whole power supply by collecting the change of the TTL level so as to meet the requirements of the laser.
Referring to fig. 2, the pumping source is not current-output when the supply voltage is lower than V2, the current output starts when the supply voltage is higher than V2, the maximum current is output when the supply voltage reaches V1, and the required supply voltage variation is substantially quasi-linear from the current output to the maximum current output. The present embodiment is designed by using such characteristics of laser pumping, and the constant current compensation output module 300 and the basic voltage output module 400 are arranged in series to be applied to the power supply of the pumping source. Illustratively, the no-load output voltage of the constant current compensation output module 300 is 2V; the basic voltage output module 400 is a basic voltage output with a wide output voltage range, a user can correspondingly adjust the basic voltage according to laser pumping modules of different manufacturers, the voltage of the basic voltage and the voltage of the basic voltage are added below V2 in an idle state, when the laser pumping modules need to emit light, a front-stage circuit of a constant current driving circuit in a laser can send a laser control signal (the laser control signal is a voltage signal and is generally defined as 0-2.5V and correspondingly outputs 0-25A current) with a corresponding analog quantity to the constant current compensation output module 300, the main control module 100 adjusts the output voltage of the constant current compensation output module 300 according to the change of the laser control signal, the range of the output voltage is 2-30V, the voltage of the basic voltage output module 400 is unchanged, so that the voltages connected in series between the two modules can also change to meet different voltages required by the laser pumping modules when outputting different currents, and finally the constant current output of the laser pumping modules is realized.
It can be understood that, compared with the conventional power supply scheme of the laser pump module, the constant current driving circuit of the embodiment has a circuit structure that three-stage power conversion is reduced to two-stage power conversion, so that the overall efficiency is correspondingly improved, and the size of the whole laser pump module is reduced. The constant current compensation output module 300 is a low voltage output, and may use a low voltage MOS device with a lower cost, and may operate at a higher operating frequency than a high voltage MOS device used in a conventional scheme. In addition, the series output of the constant current compensation output module 300 and the basic voltage output module 400 can be compatible with laser pump modules with different voltage requirements. The constant current compensation output module 300 can perform multi-path expansion, which is beneficial to meeting the requirements of a multi-path laser pumping module.
Referring to fig. 3, specifically, the main control module 100 includes: the first arithmetic unit 110 is configured to obtain the laser control signal and the average current sampling signal, and obtain an error current signal according to the laser control signal and the average current sampling signal. And a current loop unit 120, configured to perform a 2P2Z operation on the error current signal, and output a target operation result. And a sawtooth wave generating unit 130 for generating a sawtooth wave signal. The second operation unit 140 is configured to obtain the sawtooth wave signal and the target operation result, and obtain a reference signal according to the sawtooth wave signal and the target operation result. And a comparing unit 150, configured to obtain the peak current sampling signal and the reference signal, compare the peak current sampling signal and the reference signal, and output a comparison result. A PWM (Pulse width modulation) signal generating unit 160, configured to output the second control signal group, and adjust a duty ratio of the second control signal group according to the comparison result.
The first operation unit 110 is electrically connected to the constant current compensation output module 300 and the current loop unit 120, the current loop unit 120 is electrically connected to the sawtooth wave generation unit 130, the sawtooth wave generation unit 130 is electrically connected to the second operation unit 140, the second operation unit 140 is electrically connected to the comparison unit 150, the comparison unit 150 is electrically connected to the constant current compensation output module 300, the second operation unit 140 and the PWM signal generation unit 160, and the PWM signal generation unit 160 is electrically connected to the constant current compensation output module 300.
In this embodiment, the main control module 100 adopts a control chip of a DSP chip, an ARM chip, an FPGA chip, or the like, and exemplarily, a control chip of a model STM32G474RET6 is adopted in this embodiment, wherein the control chip receives a laser control signal and an average current sampling signal, a first operation unit 110 and a second operation unit 140 inside the control chip are adders, the average current sampling signal and the laser control signal pass through the first operation unit 110 to obtain an error current signal, 2P2Z calculation is performed by using a filter architecture (filter mathematical accelerator) inside the control chip, a calculation result is converted into a current inner loop reference, and the current inner loop reference is overlapped with a sawtooth wave signal generated by the sawtooth wave generation unit 130 through the second operation unit 140 to form a reference signal with a slope compensation signal. The slope compensation is added to the present embodiment to suppress the sub-harmonic oscillation problem that occurs due to duty cycles > 50%. The reference signal and the peak current sampling signal are compared by the comparing unit 150, wherein the comparing unit 150 uses a comparator, and the comparison result passes through the PWM signal generating unit 160 and then outputs the second control signal group of the target duty ratio, thereby implementing the constant current output of the target compensation voltage of the constant current compensation output module 300.
Referring to fig. 4 and 5, specifically, the constant current compensation output module 300 includes: a first sampling resistor RS1, a first BUCK unit 310, a second BUCK unit 320, and a first secondary winding T1D, a second secondary winding of the first transformer. One end of a first secondary coil T1D of the first transformer is connected to the first BUCK unit 310 and the second BUCK unit 320, one end of a second secondary coil T1C of the first transformer is connected to the first BUCK unit 310 and the second BUCK unit 320, and the other end of the first secondary coil T1D of the first transformer and the other end of the second secondary coil T1C of the first transformer are both grounded. The main power module is respectively connected to the first secondary coil and the second secondary coil, and the main control module 100 is respectively connected to the first BUCK unit 310 and the second BUCK unit 320. The first BUCK unit 310 and the second BUCK unit are connected in parallel in a 90-degree staggered manner, one end of the first sampling resistor RS1 is connected to the first BUCK unit 310 and the second BUCK unit 320, and the other end of the first sampling resistor RS1 is grounded.
It can be understood that, in order to improve the corresponding time of the constant current output, two channels of BUCK units which are connected in parallel at 90 ° in a staggered manner are adopted in the embodiment, and both the two channels of BUCK units are voltage-reducing circuits. The working frequency of the single-path BUCK unit in the embodiment is 500Khz, and the two paths of BUCK units are staggered by 1Mhz. The increase of the working frequency of the constant current compensation output module 300 brings the increase of the bandwidth of a current control loop, and the constant current driving circuit of the compensation type laser pump realizes that the rise time of the output current required by a pumping source is controlled within 5-10us, so that the working requirement of 0-20Khz dynamic frequency of a laser can be met. If a multi-path pump source module is required, the expansion of the number of paths of the constant current compensation output module 300 can be realized, so that the constant current drive control circuit of the embodiment is compatible with the requirements of a single path and a multi-path pump source.
Optionally, the first BUCK unit 310 includes: the current sampling circuit comprises a first current sampling mutual inductor TR1, a first transistor Q1, a second transistor Q2 and a first inductor L1. The input of first current sampling mutual-inductor TR1 respectively with the one end of the first secondary coil T1D of first transformer and the one end of the second secondary coil T1C of first transformer is connected, first current sampling mutual-inductor TR 1's output with first transistor Q1's input is connected, first current sampling mutual-inductor TR 1's sampling input with host system 100 is connected, first current sampling mutual-inductor TR 1's earthing terminal, first transistor Q1's output respectively with first inductance L1 and second transistor Q2's input is connected, first transistor Q1's control end with host system 100 is connected, second transistor Q2's output earthing, second transistor Q2's control end is connected host system 100.
The second BUCK unit 320 includes: a second current sampling transformer TR2, a third transistor Q3, a fourth transistor Q4, and a second inductor L2. The input end of the second current sampling transformer TR2 is connected to one end of the first secondary coil and one end of the second secondary coil, the output end of the second current sampling transformer TR2 is connected to the input end of the third transistor Q3, the sampling input end of the second current sampling transformer TR2 is connected to the main control module 100, the ground end of the second current sampling transformer TR2 is grounded, the output end of the third transistor Q3 is connected to the input ends of the second inductor L2 and the fourth transistor Q4, the control end of the third transistor Q3 is connected to the main control module 100, the output end of the fourth transistor Q4 is grounded, and the control end of the fourth transistor Q4 is connected to the main control module 100.
As can be understood, the main control module 100 correspondingly samples peak currents of the first BUCK unit 310 and the second BUCK unit 320 through the first current sampling transformer TR1 and the second current sampling transformer TR2, respectively, generates a peak current sampling signal, and sends the peak current sampling signal to the main control module 100, and the voltage at the two ends of the first sampling resistor RS1 is subjected to differential sampling to obtain an average current of the constant current compensation output module 300, and generates an average current sampling signal. The main control module 100 adjusts the duty ratio of the second control signal group according to the peak current sampling signal and the average current sampling signal, the second control signal group includes a plurality of pulse width modulation signals for respectively and independently driving the first transistor Q1, the second transistor Q2, the third transistor Q3 and the fourth transistor Q4, it can be understood that the main control module 100 adjusts the duty ratio of the second control signal group, that is, the duty ratio of each pulse width modulation signal is respectively controlled, thereby adjusting the initial compensation voltage and the output current of the constant current compensation output module 300, and realizing the constant current output of the target compensation voltage. The transistors in the constant current compensation output module 300 are low-voltage MOS transistors, and because of small junction capacitance and small impedance, compared with high-voltage MOS transistors, the constant current compensation output module can work at a higher frequency under the same heat dissipation condition, and meanwhile, low-voltage third-generation gallium nitride MOS transistors are also mature devices, and this type of device can be preferentially adopted in this embodiment, so as to improve the stability of the constant current driving circuit. In this embodiment, the specific circuit structure of the constant current compensation output module 300 may be adjusted according to actual needs, and is not limited herein.
Referring to fig. 6, the main power module includes: a fifth transistor Q5, a sixth transistor Q6, a seventh transistor Q7, an eighth transistor Q8, a primary winding T1A of the first transformer, a primary winding T2A of the second transformer, a third inductor L3, and a capacitor C1. The input end of the fifth transistor Q5 is connected to the initial voltage, the output end of the fifth transistor Q5 is connected to the input end of the sixth transistor Q6 and one end of the third inductor L3, respectively, and the control end of the fifth transistor Q5 is connected to the main control module 100. The output end of the sixth transistor Q6 is grounded, and the control end of the sixth transistor Q6 is connected to the main control module 100. The input end of the seventh transistor Q7 is connected to the initial voltage, the output end of the seventh transistor Q7 is connected to the input end of the eighth transistor Q8 and one end of the capacitor C1, respectively, and the control end of the seventh transistor Q7 is connected to the main control module 100. The output end of the eighth transistor Q8 is grounded, and the control end of the eighth transistor Q8 is connected to the main control module 100. The other end of the third inductor L3 is connected to one end of the primary winding T1A of the first transformer and one end of the primary winding T2A of the second transformer, respectively. The other end of the capacitor C1 is connected to the other end of the primary winding T1A of the first transformer and the other end of the primary winding T2A of the second transformer, respectively.
It can be understood that the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, the eighth transistor Q8, the primary coil T1A of the first transformer, the primary coil T2A of the second transformer, the third inductor L3, and the capacitor C1 form a full-bridge conversion topology, the initial voltage is converted into two paths of output through the full-bridge conversion topology, one path of output is the initial compensation voltage of the constant current compensation output module 300, and the other path of output is the base voltage of the base voltage output module 400. The first control signal group includes pulse width modulation signals for independently driving several of the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7, and the eighth transistor Q8, respectively.
Optionally, the main control module 100 is electrically connected to the basic voltage output module 400, and the main control module 100 is further configured to obtain a voltage sampling signal and a current sampling signal of the basic voltage output module 400, and adjust the first control signal group according to the voltage sampling signal and the current sampling signal.
As can be appreciated, the main control module 100 drives the fifth transistor Q5, the sixth transistor Q6, the seventh transistor Q7 and the eighth transistor Q8 of the main power module 200 by collecting the sampling voltage and the sampling current of the base voltage output module 400, so as to realize the regulated output of the base voltage output module 400.
Referring to fig. 7, in detail, the basic voltage output module 400 includes a second sampling resistor RS2, and a first secondary winding T2D and a second secondary winding of a second transformer. One end of a first secondary coil T2D of the second transformer is grounded, the other end of the first secondary coil T2D of the second transformer is connected with one end of a second sampling resistor RS2, one end of a second secondary coil T2C of the second transformer is connected with one end of the second sampling resistor RS2, the other end of the second secondary coil T2C of the second transformer is grounded, and the other end of the second sampling resistor RS2 is used for outputting the basic voltage. The voltage at the two ends of the second sampling resistor RS2 is subjected to differential sampling to send a current sampling signal to the main control module 100 for calculation, the base voltage is sent to the operational amplifier through the voltage dividing resistor, and the voltage sampling signal is sent to the main control module 100 for calculation after the differential sampling (a relevant circuit for voltage sampling is not shown in the drawing). In other embodiments, the specific circuit of the basic voltage output module 400 can be adjusted according to actual needs, and is not limited herein.
Referring to fig. 5, optionally, the constant current compensation output module 300 further includes a ninth transistor Q9, an input end of the ninth transistor Q9 is connected to the first BUCK unit 310 and the second BUCK unit 320, respectively, an output end of the ninth transistor Q9 is used for outputting the target compensation voltage, and a control end of the ninth transistor Q9 is connected to the main control module 100. The main control module 100 is configured to drive the ninth transistor Q9 to turn off when the constant current driving circuit is in a standby state or triggers a protection action.
Example two
Referring to fig. 8 to 11, the present embodiment provides a driving method applied to the constant current driving circuit according to the first embodiment.
Referring to fig. 8, the driving method includes the steps of:
s10, acquiring an initial voltage and a laser control signal;
before this step, an initialization operation is carried out, specifically, the main control module carries out an initialization self-checking operation to detect whether the constant current driving circuit is abnormal or not, then the main control module reads the default output voltage value of the basic voltage output module,
s20, obtaining a first control signal group according to the laser control signal;
s30, converting the initial voltage into an initial compensation voltage and a base voltage according to the first control signal group;
s40, acquiring a peak current sampling signal and an average current sampling signal of the constant current compensation output module;
s50, adjusting the initial compensation voltage according to the laser control signal, the peak current sampling signal and the average current sampling signal, and obtaining a target compensation voltage;
wherein step S30 and step S50 may be performed in parallel.
And S60, outputting the target compensation voltage and the basic voltage to a laser pump.
Referring to fig. 9, optionally, the driving method further includes the steps of:
s70, acquiring a voltage sampling signal and a current sampling signal of the basic voltage output module;
and S80, adjusting the first control signal group according to the voltage sampling signal and the current sampling signal.
As can be appreciated, the constant current driving circuit monitors the voltage and current states of the basic voltage output module to realize the voltage stabilization output of the basic voltage output module by adjusting the first control signal group.
Referring to fig. 10, specifically, step S50 includes:
s51, obtaining an error current signal according to the laser control signal and the average current sampling signal;
s52, performing 2P2Z operation on the error current signal, and outputting a target operation result;
s53, providing a sawtooth wave signal, and overlapping the target operation result with the sawtooth wave signal to obtain a reference signal;
s54, comparing the reference signal with the peak current sampling signal, and outputting a comparison result;
and S55, adjusting the duty ratio of the second control signal group according to the comparison result.
Referring to fig. 11, optionally, the constant current driving method further includes the steps of:
s90, sampling a voltage sampling signal of the constant current compensation output module;
and (3) voltage sampling process of the constant current compensation output module: differential sampling is carried out after voltage division through the first sampling resistor, and a voltage sampling signal is sent to the main control module.
S100, comparing a voltage sampling signal of the constant current compensation output module with a preset voltage threshold value, and outputting a first comparison result;
when the voltage sampling signal of the constant current compensation output module is greater than or equal to a preset voltage threshold value, the constant current compensation output module is in an overvoltage output abnormal state, otherwise, the constant current compensation output module works normally;
s110, comparing the average current sampling signal of the constant current compensation output module with the preset current threshold value, and outputting a second comparison result;
when the average current sampling signal of the constant current compensation output module is greater than or equal to a preset current threshold value, the constant current compensation output module is in an overcurrent output abnormal state, otherwise, the constant current compensation output module works normally;
and S120, protecting the constant current driving circuit when the first comparison result and/or the second comparison result are abnormal.
In this step, the constant current compensation output module is in at least one of an overcurrent output state and an overvoltage output state, and then the main control module executes protection operation of the constant current driving circuit. Illustratively, the main control module drives the main power module to turn off and drives the ninth transistor to turn off according to the first comparison result and/or the second comparison result.
In summary, compared with the conventional power supply scheme of the laser pump module, the constant current driving circuit and the driving method applied to the laser pump provided by the invention have the advantages that the circuit structure is reduced from three-stage power conversion to two-stage power conversion, so that the overall efficiency is correspondingly improved, and the overall size is reduced. The constant current compensation output module is low-voltage output, can adopt a low-voltage MOS tube device with lower cost, and can work at higher working frequency compared with a high-voltage MOS tube device adopted by the traditional scheme. In addition, the series output of the constant current compensation output module and the basic voltage output module can be compatible with laser pumping modules with different voltage requirements. The constant-current compensation output module can be subjected to multi-path expansion, and is favorable for meeting the requirements of a multi-path laser pumping module.
In addition, the constant current driving circuit is also provided with circuit protection, the main control module monitors the current and the voltage of the constant current compensation output module, and devices such as the main power module and the like are closed in time when abnormity occurs, so that the constant current driving circuit is protected.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the present specification and the drawings, or applied to the related technical fields directly or indirectly, are included in the scope of the present invention.

Claims (9)

1. A constant current driving circuit applied to laser pumping is characterized by comprising: the device comprises a main control module, a main power module, a constant current compensation output module and a basic voltage output module;
the main control module is respectively electrically connected with the main power module and the constant current compensation output module and is used for acquiring a laser control signal sent by a preceding stage circuit, outputting a first control signal group according to the laser control signal, acquiring an average current sampling signal and a peak current sampling signal of the constant current compensation output module, and outputting a second control signal group according to the average current sampling signal and the peak current sampling signal;
the main power module is respectively electrically connected with the constant current compensation output module and the basic voltage output module and is used for acquiring an initial voltage and converting the initial voltage into an initial compensation voltage and a basic voltage according to the first control signal group;
the constant current compensation output module is connected with the basic voltage output module in series and used for acquiring the initial compensation voltage, adjusting the initial compensation voltage and the output current of the constant current compensation output module according to the second control signal group and outputting a target compensation voltage to the laser pump;
the basic voltage output module is used for acquiring the basic voltage and outputting the basic voltage to the laser pump;
the master control module comprises:
the first arithmetic unit is electrically connected with the constant current compensation output module and is used for acquiring the laser control signal and the average current sampling signal and acquiring an error current signal according to the laser control signal and the average current sampling signal;
the current loop unit is electrically connected with the first operation unit and is used for operating the error current signal and outputting a target operation result;
the sawtooth wave generating unit is used for generating a sawtooth wave signal;
the second operation unit is respectively electrically connected with the current loop unit and the sawtooth wave generation unit, and is used for acquiring the sawtooth wave signal and the target operation result and acquiring a reference signal according to the sawtooth wave signal and the target operation result;
the comparison unit is respectively electrically connected with the constant current compensation output module and the second operation unit, and is used for acquiring the peak current sampling signal and the reference signal, comparing the peak current sampling signal with the reference signal and outputting a comparison result; and
and the PWM signal generation unit is electrically connected with the comparison unit and is used for outputting the second control signal group and adjusting the duty ratio of the second control signal group according to the comparison result.
2. The constant current driving circuit applied to laser pumping according to claim 1, wherein the constant current compensation output module comprises: the first sampling resistor, the first BUCK unit, the second BUCK unit, and the first secondary coil and the second secondary coil of the first transformer;
one end of a first secondary coil of the first transformer is connected with the first BUCK unit and the second BUCK unit respectively, one end of a second secondary coil of the first transformer is connected with the first BUCK unit and the second BUCK unit respectively, and the other end of the first secondary coil of the first transformer and the other end of the second secondary coil of the first transformer are grounded;
the main power module is respectively connected with the first secondary coil and the second secondary coil, and the main control module is respectively connected with the first BUCK unit and the second BUCK unit;
the first BUCK unit and the second BUCK unit are connected in parallel in a 90-degree staggered mode, one end of the first sampling resistor is connected with the first BUCK unit and the second BUCK unit respectively, and the other end of the first sampling resistor is grounded.
3. The constant current driving circuit applied to laser pumping according to claim 2, wherein the first BUCK unit comprises: the circuit comprises a first current sampling mutual inductor, a first transistor, a second transistor and a first inductor;
the input of first current sampling mutual-inductor respectively with the one end of the first secondary of first transformer and the one end of the second secondary of first transformer is connected, the output of first current sampling mutual-inductor with the input of first transistor is connected, the sampling input of first current sampling mutual-inductor with host system connects, the earthing terminal ground connection of first current sampling mutual-inductor, the output of first transistor respectively with first inductance and the input of second transistor is connected, the control end of first transistor with host system connects, the output ground connection of second transistor, the control end of second transistor is connected host system.
4. The constant current driving circuit applied to laser pumping according to claim 2, wherein the second BUCK unit comprises: the current sampling transformer comprises a second current sampling transformer, a third transistor, a fourth transistor and a second inductor;
the input end of the second current sampling mutual inductor is connected with one end of the first secondary coil and one end of the second secondary coil respectively, the output end of the second current sampling mutual inductor is connected with the input end of the third transistor, the sampling input end of the second current sampling mutual inductor is connected with the main control module, the grounding end of the second current sampling mutual inductor is grounded, the output end of the third transistor is connected with the second inductor and the input end of the fourth transistor respectively, the control end of the third transistor is connected with the main control module, the output end of the fourth transistor is grounded, and the control end of the fourth transistor is connected with the main control module.
5. The constant current driving circuit applied to laser pumping according to claim 1, wherein the main power module comprises: a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a primary coil of the first transformer, a primary coil of the second transformer, a third inductor and a capacitor;
the input end of the fifth transistor is connected to the initial voltage, the output end of the fifth transistor is respectively connected to the input end of the sixth transistor and one end of the third inductor, and the control end of the fifth transistor is connected to the main control module;
the output end of the sixth transistor is grounded, and the control end of the sixth transistor is connected with the main control module;
the input end of the seventh transistor is connected to the initial voltage, the output end of the seventh transistor is respectively connected to the input end of the eighth transistor and one end of the capacitor, and the control end of the seventh transistor is connected to the main control module;
the output end of the eighth transistor is grounded, and the control end of the eighth transistor is connected with the main control module;
the other end of the third inductor is connected with one end of the primary coil of the first transformer and one end of the primary coil of the second transformer respectively;
and the other end of the capacitor is respectively connected with the other end of the primary coil of the first transformer and the other end of the primary coil of the second transformer.
6. The constant current drive circuit applied to laser pumping according to claim 1, wherein the main control module is electrically connected to the basic voltage output module, and the main control module is further configured to obtain a voltage sampling signal and a current sampling signal of the basic voltage output module, and adjust the first control signal group according to the voltage sampling signal and the current sampling signal.
7. A driving method applied to the constant current driving circuit according to any one of claims 1 to 6, the driving method comprising the steps of:
acquiring an initial voltage and a laser control signal;
obtaining a first control signal group according to the laser control signal;
converting the initial voltage into an initial compensation voltage and a base voltage according to the first control signal group;
acquiring a peak current sampling signal and an average current sampling signal of a constant current compensation output module;
adjusting the initial compensation voltage according to the laser control signal, the peak current sampling signal and the average current sampling signal, and obtaining a target compensation voltage;
and outputting the target compensation voltage and the base voltage to a laser pump.
8. The driving method according to claim 7, further comprising the steps of:
acquiring a voltage sampling signal and a current sampling signal of the basic voltage output module;
adjusting the first control signal group according to the voltage sampling signal and the current sampling signal.
9. The driving method of claim 7, wherein the step of adjusting the initial compensation voltage according to the laser control signal, the peak current sampling signal, and the average current sampling signal, and obtaining a target compensation voltage comprises:
obtaining an error current signal according to the laser control signal and the average current sampling signal;
calculating the error current signal and outputting a target calculation result;
providing a sawtooth wave signal, and obtaining a reference signal after superposing the target operation result and the sawtooth wave signal;
comparing the reference signal with the peak current sampling signal and outputting a comparison result;
and adjusting the duty ratio of the second control signal group according to the comparison result.
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