CN112091417A - Laser power supply system, circuit control method thereof and laser - Google Patents
Laser power supply system, circuit control method thereof and laser Download PDFInfo
- Publication number
- CN112091417A CN112091417A CN202010806150.7A CN202010806150A CN112091417A CN 112091417 A CN112091417 A CN 112091417A CN 202010806150 A CN202010806150 A CN 202010806150A CN 112091417 A CN112091417 A CN 112091417A
- Authority
- CN
- China
- Prior art keywords
- unit
- boosting
- voltage
- constant current
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 46
- 238000005070 sampling Methods 0.000 claims description 36
- 230000001276 controlling effect Effects 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 13
- 230000003993 interaction Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Abstract
The embodiment of the invention discloses a laser power supply system, a circuit control method thereof and a laser, wherein the laser power supply system comprises a boosting unit, a constant current unit and a main control unit, wherein the boosting unit is used for boosting an input voltage and obtaining a first output voltage to supply to the constant current unit; the constant current unit is used for performing constant current processing on the first output voltage and obtaining second output voltage with constant current output to be supplied to the laser module; the main control unit is respectively connected with the boosting unit and the constant current unit and used for controlling the first output voltage of the boosting unit and the output current of the constant current unit so as to ensure the stable output of the laser power supply system.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a laser power supply system, a circuit control method thereof and a laser.
Background
Laser welding is an efficient precision welding method using a laser beam with high energy density as a heat source, and is one of important aspects of laser material processing technology application. The laser welding is a new welding process, and has the biggest advantages of high welding energy density, small heat influence range, small deformation and exquisite welding line compared with various traditional welding. The laser welding technology has a molten pool purification effect, can purify welding materials, is particularly beneficial to welding of the same or different materials, and is suitable for welding of materials such as the same or different metal materials and plastics.
Laser welding technology has been widely applied to many aspects of production and life, especially precision welding on miniature IT products, electronic component parts and the like, and lasers mainly used for laser welding at present include CO2 lasers, diode lasers, pulsed Nd: YAG lasers, disc lasers, quasi-continuous (QCW) optical fiber lasers and the like, and laser welding has high requirements on the process, so that higher requirements on laser power supply are provided.
In the prior art, a laser power supply system has the problem of poor stability, and particularly the problem of output stability under the conditions of transient high power and large current is more obvious, for example, a quasi-continuous (QCW) optical fiber laser has the characteristics of high peak value, small volume, high efficiency and simple structure, is widely applied to domestic and foreign markets, but the output stability of the power supply system is poor.
How to provide a laser power supply system with better output stability does not have an effective solution in the prior art.
Disclosure of Invention
In view of the above, it is necessary to provide a laser power supply system, a circuit control method thereof, and a laser.
The invention adopts a technical means that: there is provided a laser power supply system comprising:
the voltage boosting unit is used for boosting the input voltage and obtaining a first output voltage to supply to the constant current unit;
the constant current unit is used for performing constant current processing on the first output voltage and obtaining second output voltage with constant current output to be supplied to the laser module; and
and the main control unit is respectively connected with the boosting unit and the constant current unit and is used for controlling the first output voltage of the boosting unit and the output current of the constant current unit.
The invention adopts another technical means that: a laser power supply circuit control method is provided, which comprises the following steps:
boosting the input voltage to obtain a first output voltage and supplying the first output voltage to the constant current unit;
performing constant current processing on the first output voltage and obtaining a second output voltage with constant current output to supply to a laser module;
and controlling the first output voltage of the boosting unit and the output current of the constant current unit.
The invention adopts another technical means that: a laser is provided, which comprises the laser power supply system.
According to the laser power supply system, the technical scheme that the laser power supply system is boosted firstly and then is constant-current is adopted, the boosting unit is used for boosting input voltage firstly to obtain first output voltage to be supplied to the constant-current unit, the constant-current unit is used for constant-current processing the first output voltage to obtain second output voltage with constant-current output to be supplied to the laser module, and the voltage and current closed-loop control idea is adopted, so that the first output voltage of the boosting unit and the output current of the constant-current unit are controlled through the main control unit, and the stable output of the laser power supply system is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a schematic diagram of a power supply system for a laser according to an embodiment;
FIG. 2 is a schematic diagram of a power supply system of a laser according to an embodiment;
FIG. 3 is a schematic diagram of an exemplary laser power system control signal flow;
FIG. 4 is a schematic diagram of an exemplary laser power system control signal flow;
FIG. 5 is a schematic diagram of a laser power supply system boost circuit in accordance with one embodiment;
FIG. 6 is a constant current circuit diagram of a laser power supply system in one embodiment;
FIG. 7 is a power conversion circuit diagram of a laser power system in one embodiment;
FIG. 8 is a diagram illustrating an exemplary embodiment of an energy storage variation of the laser power system with instantaneous large current output;
FIG. 9 is a schematic diagram of a power supply system for a laser according to an embodiment;
FIG. 10 is a flow chart illustrating a method for controlling a laser power supply circuit according to one embodiment;
in the figure: 1. the device comprises a switching power supply, 2, a boosting unit, 3, a constant current unit, 4, a laser module, 5, a main control unit, 6, an interaction unit, 7, a voltage feedback unit, 8, a boosting driving unit, 9, a current feedback unit, 10, a constant current driving unit, 11, a protection unit, 12 and a fan speed regulation unit.
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.
The terms first, second and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.
The invention provides a laser power supply system, as shown in fig. 1, fig. 1 provides a schematic structural diagram of the laser power supply system. The input voltage of the laser power supply system can be a direct-current voltage provided by a switching power supply or a direct-current voltage provided by other direct-current power supplies. The laser power supply system is used for stably supplying power to the laser.
Specifically, in an embodiment, referring to fig. 1, the laser power supply system may include a voltage boosting unit 2, a constant current unit 3, and a main control unit 5. The boosting unit 2 is configured to perform boosting processing on an input voltage and obtain a first output voltage, and supply the first output voltage to the constant current unit 3, where the boosting unit 2 may adopt a Boost circuit topology structure or other boosting circuits; the constant current unit 3 is configured to perform constant current processing on the first output voltage and obtain a second output voltage with a constant current output, and supply the second output voltage to the laser module 4, where the constant current unit 3 may adopt a Buck circuit topology structure or other constant current circuits; the main control unit 5 is configured to control the first output voltage of the voltage boosting unit 2 and the output current of the constant current unit 3, where the main control unit 5 may adopt a digital control chip or other control chips.
Specifically, the input voltage may be a dc voltage provided by a switching power supply 1, the voltage boosting unit 2 may have one end connected to the switching power supply 1 and the other end connected to one end of the constant current unit 3, and the other end of the constant current unit 3 is connected to the laser module 4, where the laser module 4 may be a quasi-continuous (QCW) fiber laser or another laser. The main control unit 5 is respectively connected to the voltage boosting unit 2 and the constant current unit 3, and is configured to control the first output voltage of the voltage boosting unit 2 and the output current of the constant current unit 3.
In the embodiment, a technical scheme of boosting firstly and then constant current is adopted, the direct-current voltage input by the switching power supply 1 is boosted by the boosting unit 2 to obtain the first output voltage and supplied to the constant-current unit 3, then the constant-current unit 3 performs constant-current processing on the first output voltage to obtain the second output voltage with constant-current output and supplies the second output voltage to the laser module 4, and meanwhile, the main control unit 5 controls the first output voltage of the boosting unit 2 and the output current of the constant-current unit 3 to enable the output of the laser power supply system to be more stable, so that the effect is more obvious particularly under the condition that the laser module 4 is a quasi-continuous (QCW) fiber laser, and particularly under the conditions of transient high power and high current, the embodiment controls the first output voltage of the boosting unit 2 by the main control unit 5 to ensure the first output voltage to be stable, the constant current unit 3 is supplied, and the main control unit 5 controls the output current of the constant current unit 3 to ensure that the current supplied to the laser is constant and the stable output of the laser power supply system is ensured.
In one embodiment, as shown in fig. 2, the laser power supply system may further include an interaction unit 6, where the interaction unit 6 is configured to receive a laser welding index input by a user; the interaction unit can comprise a touch screen, a tablet computer, handwriting equipment, voice interaction equipment and the like, wherein the touch screen is provided with an upper computer for programming. Further, the user can input the laser welding index through the visual operation interface. The laser welding index may include parameter settings, mode selection, status inquiry, and the like. For example, before preparing for laser welding, a user may perform parameter settings through the interaction unit 6, where the parameter settings may include power peak, frequency, waveform parameters, and the like in a pulse mode, and the user may also perform mode selection through the interaction unit 6, where the mode selection may be switching between a pulse mode and a continuous mode. In the laser welding process, a user can also inquire the state through the interaction unit 6, and the state inquiry can inquire the state of the laser in real time, so that the laser welding device is convenient and visual. Further, the interaction unit 6 may further include an alarm information display, which may include an alarm of too fast light output, a parameter setting error alarm, a temperature alarm, a power attenuation alarm, and the like. The interaction unit 6 is connected with the main control unit 5, and the main control unit 5 controls the first output voltage of the boosting unit 2 and the output current of the constant current unit 3 according to the laser welding index received by the interaction unit, so as to ensure stable output of energy required by laser welding.
In one embodiment, as shown in fig. 3, the laser power supply system may include a voltage feedback unit 7 and a boost driving unit 8, wherein the voltage feedback unit 7 is configured to detect a first output voltage of the boost unit 2 and generate a first sampling voltage; the main control unit 5 controls the boosting unit 2 through the boosting driving unit 8. Further, the voltage feedback unit 7 is connected to the main control unit 5, and the main control unit 5 controls the first output voltage of the voltage boost unit 2 according to the first sampling voltage; the laser power supply system can further comprise a current feedback unit 9 and a constant current driving unit 10, wherein the current feedback unit 9 is used for detecting the output current of the constant current unit 3 and generating a first sampling current; the main control unit 5 controls the constant current unit 3 through the constant current driving unit 10. Further, the current feedback unit 9 is connected to the main control unit 5, and the main control unit 5 controls the output current of the constant current unit 3 according to the first sampling current.
Specifically, as shown in fig. 3, one end of the boosting unit 2 may be connected to the switching power supply 1, and is configured to boost a dc voltage input by the switching power supply 1 and obtain a first output voltage; the other end of the boosting unit 2 is connected to one end of the constant current unit 3, and is configured to supply the first output voltage to the constant current unit 3, and the other end of the boosting unit 2 is connected to the main control unit 5 through the voltage feedback unit 7, and is configured to feed back a first sampling voltage generated by the voltage feedback unit 7 detecting the first output voltage of the boosting unit 2 to the main control unit 5; the main control unit 5 is connected with the boosting unit 2 through the boosting driving unit 8, and is used for controlling the boosting unit 2 through the boosting driving unit 8. One end of the constant current unit 3 may be connected to the voltage boosting unit 2, and is configured to use the first output voltage as an input; the other end of the constant current unit 3 is connected to one end of the laser module 4, and is configured to perform constant current processing on the first output voltage and obtain a second output voltage with constant current output, and supply the second output voltage to the laser module 4, and the other end of the constant current unit 3 is connected to the main control unit 5 through the current feedback unit 9, and is configured to feed back a first sampling current generated by the current feedback unit 9 detecting the output current of the constant current unit 3 to the main control unit 5; the main control unit 5 is connected to the constant current unit 3 through the constant current driving unit 10, and is configured to control the constant current unit 3 through the constant current driving unit 10.
Specifically, referring to fig. 3, in the control signal flow of the laser power control system in this embodiment, a direct current is input through the switching power supply 1, the voltage boosting unit 2 boosts the input voltage to obtain a first output voltage, and supplies the first output voltage to the constant current unit 3, the voltage boosting unit 2 detects the first output voltage of the voltage boosting unit 2 through the voltage feedback unit 7 and generates a first sampling voltage to be fed back to the main control unit 5, and the main control unit 5 controls the first output voltage of the voltage boosting unit 2 through the voltage boosting driving unit 8 according to the first sampling voltage to implement voltage closed-loop control, so that the first output voltage can be stably output; the constant current unit 3 performs constant current processing according to the obtained first output voltage and obtains second output voltage to be supplied to the laser module 4, the constant current unit 3 generates first sampling current through the output current of the constant current unit 3 detected by the current feedback unit 9 and feeds the first sampling current back to the main control unit 5, and the main control unit 5 controls the output current of the constant current unit 3 through the constant current driving unit 10 according to the first sampling current to realize current closed-loop control, so that the current supplied to the laser module 4 by the laser power supply system is constant.
In this embodiment, the voltage boosting unit 2, the constant current unit 3, the voltage feedback unit 7, the current feedback unit 9, the main control unit 5, the voltage boosting driving unit 8 and the constant current driving unit 10 realize voltage closed-loop control and current closed-loop control, so that the current supplied to the laser module 4 by the laser power supply system is constant, the output energy of the laser power supply system is ensured to be stable, and especially, the output energy of the laser power supply system is ensured to be stable, accurate and controllable under the conditions of transient high power and large current.
In one embodiment, as shown in fig. 4, the laser power supply system may further include a plurality of booster units 2. Specifically, when a plurality of boosting units 2 are provided, each boosting unit 2 is connected to the main control unit 5; the booster unit 2 has an operating state and a non-operating state, the operating state refers to the booster unit 2 providing the first output voltage, and the non-operating state refers to the booster unit 2 not providing the first output voltage; the main control unit 5 controls each boosting unit 2 to alternately switch the working state according to a preset switching mode, so that one of the boosting units 2 is in the operating state.
For example only, each boosting unit is set as a first boosting unit, a second boosting unit, a third boosting unit, and the like, the preset switching manner is set to sequentially switch the operating states according to a certain sequence, and the preset switching manner may also switch the operating states according to other preset switching manners.
Specifically, when the number of the boosting units 2 is 3, the boosting units are set as a first boosting unit, a second boosting unit and a third boosting unit; setting the preset switching mode to sequentially switch the working states according to the sequence of the first, second and third boosting units, namely when the first boosting unit is in the running state, the second boosting unit and the third boosting unit are in the non-running state; when the second boosting unit is in the operating state, the first boosting unit and the third boosting unit are in a non-operating state; when the third boosting unit is in the operating state, the first boosting unit and the second boosting unit are in a non-operating state. Of course, the preset switching manner may also be sequentially switched to the working states according to a sequence of "third", "second", and "first" of the boosting units, that is, when the third boosting unit is in the operating state, the first boosting unit and the second boosting unit are in the non-operating state; when the second boosting unit is in the operating state, the first boosting unit and the third boosting unit are in a non-operating state; when the first boosting unit is in the operating state, the second boosting unit and the third boosting unit are in a non-operating state. Or the preset switching mode can also be used for sequentially switching the working states according to the sequence of the second, the first and the third of the boosting units. The number of the boosting units 2 is merely an example, and the number of the boosting units 2 may be 6, 10, or another number.
In this embodiment, by providing the plurality of boosting units 2, the main control unit 5 controls the boosting units 2 to alternately switch the working states according to a preset switching manner, so that one of the boosting units 2 is in the operating state, and thus, the multi-path alternate output of the boosting units can effectively reduce the ripple of the first output voltage of the boosting units 2, and further reduce the ripple of the laser power supply system.
In an embodiment, the boosting unit 2 and the constant current unit 3 may include one or more switching tubes, which may be MOS tubes, transistors, or the like, or may be other switches capable of receiving a switch control signal to further implement switching operation. The main control unit 5 controls the switching tube through the boosting driving unit 8 and/or the constant current driving unit 10, and further controls the first output voltage of the boosting unit 2 and/or the output current of the constant current unit 3. Further, the main control unit 5 may control a duty ratio of the switching tube through the boosting driving unit 8 and/or the constant current driving unit 10, so as to control the first output voltage of the boosting unit 2 and the output current of the constant current unit 3.
In an embodiment, fig. 5 is a voltage boosting circuit diagram of a power supply system of a laser in an embodiment, the voltage boosting unit 2 includes a first switch Q1, a first inductor L1, and a first diode D1, the first switch Q1 is a MOS transistor; the switching power supply 1 provides an input voltage Vin, the switching power supply 1 has a positive output end and a negative output end, and the negative output end is connected with a power ground GND; the voltage feedback unit 7 comprises a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2 which are connected in series; the booster unit 2 further comprises a first capacitor C1 and a second capacitor C2 which are connected in parallel with each other; the boosting drive unit 8 comprises a boosting drive circuit, and the main control unit 5 comprises a main control circuit.
As shown in fig. 5, the gate of the first switch Q1 is connected to the main control circuit via the boost driving circuit, the drain of the first switch Q1 is connected to the positive output terminal of Vin via the first inductor L1 and is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is used as the output terminal to generate the first output voltage Vout1 to supply to the constant current unit 3; the source electrode of the first switching tube Q1 is connected with a power ground GND; one end of the first voltage-dividing resistor R1 is connected with the cathode of the first diode D1, and the other end of the first voltage-dividing resistor R1 is connected with one end of the second voltage-dividing resistor R2 and is connected with the main control circuit; the other end of the second voltage-dividing resistor R2 is connected with a power ground GND; the anode of the first capacitor C1 is connected to the cathode of the first diode D1, the cathode of the first capacitor C1 is connected to the power ground GND, one end of the second capacitor C2 is connected to the anode of the first capacitor C1, and the other end of the second capacitor C2 is connected to the cathode of the first capacitor C1.
In this embodiment, the first output voltage Vout1 obtained by the first switching tube Q1, the first inductor L1 and the first diode D1 is supplied to the constant current unit 3, the first sampling voltage obtained by detecting the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is fed back to the main control circuit, and the main control circuit controls the duty ratio of the first switching tube Q1 according to the first sampling voltage, so that the first output voltage Vout1 can be stably output, voltage closed-loop control is realized, and meanwhile, monitoring is performed on the pulse change of the first output voltage Vout1, and it is ensured that the energy supplied to the constant current unit 3 is stable.
It should be noted that the boosting unit 2 may be plural, that is, the first switching tube Q1, the first inductor L1 and the first diode D1 may be plural. That is, the plurality of first switching tubes Q1 are connected in parallel with each other, the plurality of first inductors L1 are connected in parallel with each other, and the plurality of first diodes D1 are connected in parallel with each other; the main control circuit controls each boosting unit 2 to alternately switch the working state according to a preset switching mode, so that one of the boosting units 2 is in the operating state, that is, the main control circuit controls each first switching tube Q1 to alternately conduct according to the preset switching mode, so that one of the boosting units 2 is in the operating state, and the ripple of the first output voltage Vout1 is effectively reduced.
In an embodiment, fig. 6 is a constant current circuit diagram of a laser power supply system in an embodiment, the constant current unit 3 includes a second switching tube Q2, a second inductor L2, and a second diode D2, and the second switching tube Q2 is a MOS transistor; the first output voltage Vout1 is used as the input voltage of the constant current unit 3; the current feedback unit 9 comprises a sampling resistor Rsensor; the constant current unit 3 further comprises a first capacitor C3 and a second capacitor C4 which are connected in parallel with each other; the laser module 4 comprises a laser component LD; the constant current driving unit 10 includes a constant current driving circuit, and the main control unit 5 includes a main control circuit.
As shown in fig. 6, the gate of the second switching tube Q2 is connected to the main control circuit via the constant current driving circuit, the drain of the second switching tube Q2 is connected to the first output voltage Vout1, the source of the second switching tube Q2 is connected to the anode of the laser module LD via the second inductor L2, and is connected to the cathode of the second diode D2; the anode of the second diode D2 is connected to the power ground GND and to one end of the sampling resistor Rsensor; the other end of the sampling resistor Rsensor is connected with the negative electrode of the laser component LD and is connected with the main control circuit; the anode of the third capacitor C3 is connected to the anode of the laser module LD, the cathode of the third capacitor C3 is connected to the cathode of the laser module LD, one end of the fourth capacitor C4 is connected to the anode of the third capacitor C3, and the other end of the fourth capacitor C4 is connected to the cathode of the third capacitor C3.
In this embodiment, the second switch tube Q2, the second inductor L2 and the second diode D2 obtain a second output voltage to supply to the laser module LD, and a first sampling current obtained by detecting the sampling resistor Rsensor is fed back to the main control circuit, and the main control circuit controls the duty ratio of the second switch tube Q2 according to the first sampling current, so that the current supplied to the laser module LD is constant, thereby realizing current closed-loop control, realizing accurate control of output energy, and realizing control of laser output of the laser module LD.
In an embodiment, fig. 7 is a power conversion circuit diagram of a laser power supply system in an embodiment, where the embodiment adopts a technical scheme of boosting first and then constant current, specifically, a front-stage boost circuit realizes power conversion of the boost circuit through the first inductor L1, the first switching tube Q1, the first diode D1, the first voltage-dividing resistor R1, the second voltage-dividing resistor R2, the first capacitor C1, the second capacitor C2, the boost driving circuit, and the main control circuit; further, the dc voltage Vin provided by the switching power supply 1 is boosted by the first inductor L1, the first switching tube Q1, and the first diode D1 of the voltage boosting unit 2 to obtain the first output voltage Vout1 to operate the constant current unit 3, the first output voltage of the voltage boosting unit 2 is detected by the first voltage dividing resistor R1 and the second voltage dividing resistor R2 to generate the first sampling voltage, and the first sampling voltage is fed back to the main control circuit, the main control circuit controls the first output voltage Vout1 of the voltage boosting unit 2 through the voltage boosting driving circuit according to the first sampling voltage, and energy storage filtering is performed through the first capacitor C1 and the second capacitor C2 to ensure energy output of the first output voltage Vout 1. The rear-stage constant current circuit realizes that the constant current circuit has constant current output through the second inductor L2, the second switching tube Q2, the second diode D2, the sampling resistor Rsensor, the third capacitor C3, the fourth capacitor C4, the constant current driving circuit and the main control circuit; further, the first output voltage Vout1 is subjected to constant current processing by the second inductor L2, the second switching tube Q2 and the second diode D2, and a second output voltage with a constant current output is obtained and supplied to the laser module LD, and the output current of the constant current unit 3 is detected by the sampling resistor Rsensor and a first sampling current is generated and fed back to the main control circuit, the main control circuit controls the output current of the constant current unit 3 by the constant current driving circuit according to the first sampling current, so as to ensure that the current supplied to the laser module LD is constant, and performs energy storage filtering by the third capacitor C3 and the fourth capacitor C4, so as to ensure that the energy supplied to the laser module LD is stable.
In this embodiment, the pre-stage boost circuit adopts a voltage feedback manner, the main control circuit controls a first output voltage Vout1 of the boost circuit according to a first sampling voltage obtained by detecting the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and simultaneously the first capacitor C1 and the second capacitor C2 are fully charged with energy, and a user can input a laser welding index through the interaction unit 6; the rear-stage constant current circuit adopts a current feedback mode, the main control circuit controls the current supplied to the laser component LD according to the first sampling current obtained by the detection of the sampling resistor Rsensor, and particularly controls the current supplied to the laser component LD to be at a set value while generating instantaneous large current. As shown in fig. 8, when a large current is generated instantaneously, that is, when the light energy of the laser module LD is output instantaneously, the voltages at the two ends of the third capacitor C3 and the fourth capacitor C4 drop, and the energy of the first capacitor C1 and the energy of the second capacitor C2 are provided to the constant current unit 3, so that the output energy of the laser power supply system is stable, and the output energy is accurately controllable.
In one embodiment, as shown in fig. 9, the laser power supply system further includes a protection unit 11; the protection unit 11 is connected with the main control unit 5; the protection unit 11 comprises one or more of an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit, an overheat protection circuit, a no-load protection circuit and a short-circuit protection circuit;
in one embodiment, as shown in fig. 9, the laser power system further includes a fan speed regulation unit 12; the fan speed regulating unit 12 is connected with the main control unit 5; the main control unit 5 controls the fan speed of the laser power system through the fan speed regulating unit 12.
In an embodiment, an embodiment of the present invention provides a laser power supply circuit control method, where the laser power supply system provided in any of the above embodiments implements laser power supply circuit control, specifically, as shown in fig. 10, the laser power supply circuit control method may include:
step S1: boosting the input voltage to obtain a first output voltage and supplying the first output voltage to the constant current unit;
step S2: performing constant current processing on the first output voltage and obtaining a second output voltage with constant current output to supply to a laser module;
step S3: and controlling the first output voltage of the boosting unit and the output current of the constant current unit.
In one embodiment, the present invention provides a laser including the laser power supply system described in the above embodiments.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A laser power supply system, comprising:
the voltage boosting unit is used for boosting the input voltage and obtaining a first output voltage to supply to the constant current unit;
the constant current unit is used for performing constant current processing on the first output voltage and obtaining second output voltage with constant current output to be supplied to the laser module; and
and the main control unit is respectively connected with the boosting unit and the constant current unit and is used for controlling the first output voltage of the boosting unit and the output current of the constant current unit.
2. The laser power system of claim 1, further comprising:
the voltage feedback unit is used for detecting the first output voltage of the boosting unit and generating a first sampling voltage;
the voltage feedback unit is connected with the main control unit, and the main control unit controls the first output voltage of the boosting unit according to the first sampling voltage;
and the main control unit controls the boosting unit through the boosting driving unit.
3. The laser power system of claim 1, further comprising:
the current feedback unit is used for detecting the output current of the constant current unit and generating a first sampling current;
the current feedback unit is connected with the main control unit, and the main control unit controls the output current of the constant current unit according to the first sampling current;
and the main control unit controls the constant current unit through the constant current driving unit.
4. The laser power supply system according to any one of claims 1 to 3, wherein the boosting unit is one or more;
when the number of the boosting units is multiple, each boosting unit is respectively connected with the main control unit;
the boosting unit has an operating state and a non-operating state, wherein the operating state refers to the boosting unit providing the first output voltage, and the non-operating state refers to the boosting unit not providing the first output voltage;
the main control unit controls the boosting units to alternately switch the working state according to a preset switching mode so as to enable one of the boosting units to be in the running state.
5. The laser power system of claim 2,
the boosting unit comprises a first switching tube, a first inductor and a first diode;
the input voltage is provided by a switching power supply having a positive output terminal and a negative output terminal; the control end of the first switch tube is connected with the main control unit through the boost driving unit, the first switch end of the first switch tube is connected with the anode output end of the switching power supply through the first inductor and is connected with the anode of the first diode, the cathode of the first diode is connected with the constant current unit, and the second switch end of the first switch tube is connected with the cathode output end of the switching power supply;
the voltage feedback unit comprises a first voltage-dividing resistor and a second voltage-dividing resistor which are connected in series;
one end of the first voltage-dividing resistor is connected with the cathode of the first diode, and the other end of the first voltage-dividing resistor is connected with one end of the second voltage-dividing resistor and is connected with the main control unit; the other end of the second voltage-dividing resistor is connected with the negative electrode output end of the switching power supply;
the boosting unit further comprises a first capacitor and a second capacitor which are connected in parallel;
the positive electrode of the first capacitor is connected with the negative electrode of the first diode, the negative electrode of the first capacitor is connected with the negative electrode output end of the switching power supply, one end of the second capacitor is connected with the positive electrode of the first capacitor, and the other end of the second capacitor is connected with the negative electrode of the first capacitor.
6. The laser power system of claim 3,
the constant current unit comprises a second switching tube, a second inductor and a second diode; the current feedback unit comprises a sampling resistor;
the control end of the second switching tube is connected with the main control unit through the constant current driving unit, the first switching end of the second switching tube is connected with the output end of the boosting unit, and the second switching end of the second switching tube is connected with one end of the laser module through the second inductor and is connected with the cathode of the second diode; the anode of the second diode is connected with the cathode output end of the switching power supply and is connected with one end of the sampling resistor; the other end of the sampling resistor is connected with the other end of the laser module and is connected with the main control unit;
the constant current unit further comprises a third capacitor and a fourth capacitor which are connected in parallel;
the positive pole of the third capacitor is connected with one end of the laser module, the negative pole of the third capacitor is connected with the other end of the laser module, one end of the fourth capacitor is connected with the positive pole of the third capacitor, and the other end of the fourth capacitor is connected with the negative pole of the third capacitor.
7. The laser power system according to claim 1, further comprising a protection unit;
the protection unit is connected with the main control unit;
the protection unit comprises one or more of an overcurrent protection circuit, an overvoltage protection circuit, an undervoltage protection circuit, an overheat protection circuit, a no-load protection circuit and a short-circuit protection circuit.
8. The laser power system of claim 1, further comprising a fan speed regulation unit;
the fan speed regulating unit is connected with the main control unit;
and the main control unit controls the fan speed of the laser power system through the fan speed regulating unit.
9. A laser power supply circuit control method is characterized by comprising the following steps:
boosting the input voltage to obtain a first output voltage and supplying the first output voltage to the constant current unit;
performing constant current processing on the first output voltage and obtaining a second output voltage with constant current output to supply to a laser module;
and controlling the first output voltage of the boosting unit and the output current of the constant current unit.
10. A laser comprising a laser power supply system according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806150.7A CN112091417A (en) | 2020-08-12 | 2020-08-12 | Laser power supply system, circuit control method thereof and laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806150.7A CN112091417A (en) | 2020-08-12 | 2020-08-12 | Laser power supply system, circuit control method thereof and laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112091417A true CN112091417A (en) | 2020-12-18 |
Family
ID=73753427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010806150.7A Pending CN112091417A (en) | 2020-08-12 | 2020-08-12 | Laser power supply system, circuit control method thereof and laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112091417A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566523A (en) * | 2022-10-24 | 2023-01-03 | 深圳市中图仪器股份有限公司 | Laser power supply system coupled by multiple circuits |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201690112U (en) * | 2010-03-26 | 2010-12-29 | 深圳市大族激光科技股份有限公司 | Power supply circuit of gas laser |
| CN104242422A (en) * | 2014-08-27 | 2014-12-24 | 武汉凌云光电科技有限责任公司 | Method and circuit for charging energy-storage capacitor of power supply for pulse xenon lamp |
| CN204053236U (en) * | 2014-08-30 | 2014-12-31 | 深圳市创富鑫激光科技有限公司 | Semiconductor laser bonding machine |
| US20170244212A1 (en) * | 2014-08-01 | 2017-08-24 | Nlight, Inc. | Distributed laser power architecture for laser diode arrays |
| CN107787084A (en) * | 2016-08-25 | 2018-03-09 | 株式会社小糸制作所 | Lamp circuit and lamps apparatus for vehicle |
| CN107863687A (en) * | 2017-12-10 | 2018-03-30 | 北京工业大学 | A kind of high-precision laser remote sensing numerical control electric power system and control method |
-
2020
- 2020-08-12 CN CN202010806150.7A patent/CN112091417A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201690112U (en) * | 2010-03-26 | 2010-12-29 | 深圳市大族激光科技股份有限公司 | Power supply circuit of gas laser |
| US20170244212A1 (en) * | 2014-08-01 | 2017-08-24 | Nlight, Inc. | Distributed laser power architecture for laser diode arrays |
| CN104242422A (en) * | 2014-08-27 | 2014-12-24 | 武汉凌云光电科技有限责任公司 | Method and circuit for charging energy-storage capacitor of power supply for pulse xenon lamp |
| CN204053236U (en) * | 2014-08-30 | 2014-12-31 | 深圳市创富鑫激光科技有限公司 | Semiconductor laser bonding machine |
| CN107787084A (en) * | 2016-08-25 | 2018-03-09 | 株式会社小糸制作所 | Lamp circuit and lamps apparatus for vehicle |
| CN107863687A (en) * | 2017-12-10 | 2018-03-30 | 北京工业大学 | A kind of high-precision laser remote sensing numerical control electric power system and control method |
Non-Patent Citations (1)
| Title |
|---|
| 李志谦: "《精通FANUC机器人编程、维护与外围集成》", 31 January 2020, 机械工业出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115566523A (en) * | 2022-10-24 | 2023-01-03 | 深圳市中图仪器股份有限公司 | Laser power supply system coupled by multiple circuits |
| CN116613620A (en) * | 2022-10-24 | 2023-08-18 | 深圳市中图仪器股份有限公司 | Real-time feedback control system of laser power supply |
| CN116613619A (en) * | 2022-10-24 | 2023-08-18 | 深圳市中图仪器股份有限公司 | Laser power supply system with overvoltage protection function |
| CN116613620B (en) * | 2022-10-24 | 2023-12-29 | 深圳市中图仪器股份有限公司 | Real-time feedback control system of laser power supply |
| CN116613619B (en) * | 2022-10-24 | 2024-01-02 | 深圳市中图仪器股份有限公司 | Laser power supply system with overvoltage protection function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8233297B2 (en) | Multi-stage power supply | |
| CN107276405B (en) | The fine electric spark pulse power and Discrete control method based on the power supply | |
| EP3494813B1 (en) | Electronic cigarette drive circuit and electronic cigarette | |
| CN101631410B (en) | AC-DC LED drive circuit with high power factor | |
| CN100521473C (en) | Stepping inductor for fast transient response of switching converter | |
| EP1508960A2 (en) | Method of forming a high efficiency power controller | |
| CN103051220B (en) | Switching Power Supply and controller thereof | |
| CN101925222A (en) | Power output circuit for LED driving device | |
| CN105657903A (en) | Mixed light dimming circuit and mixed light dimming method used for LED | |
| CN102332827A (en) | Power supply converter with electricity-saving mechanism and power supply conversion method | |
| CN101483353A (en) | Buck type auxiliary electric power controlled by PFM | |
| CN112091417A (en) | Laser power supply system, circuit control method thereof and laser | |
| CN105390097A (en) | Backlight drive circuit and display screen | |
| CN110429820B (en) | Control circuit and control method for improving transient response of BOOST during Down Mode switching | |
| CN201585170U (en) | AC-DC LED drive circuit with high power factor | |
| CN101877535A (en) | Bipolar transistor self-exciting Buck-Boost converter | |
| CN203026790U (en) | Quantum cascade laser drive and temperature control circuit | |
| US11128216B2 (en) | Converter, step-down method based on the converter and electronic device | |
| CN115411936A (en) | Overpower protection circuit and switching power supply | |
| CN213342018U (en) | Solar controller | |
| CN203339960U (en) | Boost circuit | |
| CN209151003U (en) | A kind of switching power supply system | |
| CN109390840B (en) | Driving circuit applied to laser | |
| US8692476B2 (en) | Boost circuit for LED backlight driver circuit | |
| CN217388527U (en) | Preceding stage power supply circuit based on peak voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201218 |