CN107565369B - Pulse waveform modulation system of laser - Google Patents
Pulse waveform modulation system of laser Download PDFInfo
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- CN107565369B CN107565369B CN201710706658.8A CN201710706658A CN107565369B CN 107565369 B CN107565369 B CN 107565369B CN 201710706658 A CN201710706658 A CN 201710706658A CN 107565369 B CN107565369 B CN 107565369B
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Abstract
The invention relates to the field of lasers, in particular to a pulse waveform modulation system of a laser, which comprises: a first pulse input terminal to which a first pulse type selection signal is input; a second pulse input terminal to which a second pulse type selection signal is input; a third pulse input terminal to which a third pulse signal of variable frequency and duty ratio is input; the input end of the exclusive-OR gate module is respectively connected with the first pulse input end and the second pulse input end, and the output end of the exclusive-OR gate module outputs a continuous wave enable signal; and the output end of the OR gate module outputs a basic pulse signal. The invention designs a pulse waveform modulation system of a laser, realizes digital modulation of laser pulse by using a programmable integrated circuit device, and greatly reduces uncertain signal factors caused by interference in the pulse signal modulation process.
Description
Technical Field
The invention relates to the field of lasers, in particular to a pulse waveform modulation system of a laser.
Background
Lasers, particularly high power lasers, are essential components of laser light sources in laser processing systems. The current high-power laser processing is widely related to a plurality of fields such as laser cutting, laser welding, laser quenching, laser 3D printing, laser cleaning and the like.
In many laser processing applications, a laser is required to generate or modulate a specific pulse type required for its processing, and common laser waveform types are: continuous quilt, gate pulse, intense pulse, super pulse, etc., with specific reference to fig. 1, fig. 1 is a depiction of laser pulse modulation. For example, in the laser metal cutting process, a perforation stage of the cutter is required, and a laser gate pulse or a strong pulse in the range of 10KHz is required to avoid the problems of hole explosion and the like.
The traditional laser pulse modulation mode is realized by mainly building a combinational logic circuit through complex separated electronic components, and along with the development of electronic technology, the defects of the traditional laser pulse modulation mode are more and more obvious and mainly embodied in the following aspects:
1. the components are separated, so that the external circuit structure is complex and more unstable factors are brought;
2. the transmission operation of an external circuit influences the real-time performance of pulse modulation;
3. the construction function of the separating element is single, and part of high-level required functions cannot be realized or are difficult to realize.
Disclosure of Invention
The present invention provides a pulse waveform modulation system for a laser, which overcomes the problem that the disadvantages of the conventional pulse modulation method of the laser become more and more obvious.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a pulse waveform modulation system of a laser, the pulse waveform modulation system comprising:
a first pulse input terminal to which a first pulse type selection signal is input;
a second pulse input terminal to which a second pulse type selection signal is input;
a third pulse input terminal to which a third pulse signal of variable frequency and duty ratio is input;
the input end of the exclusive-OR gate module is respectively connected with the first pulse input end and the second pulse input end, and the output end of the exclusive-OR gate module outputs a continuous wave enable signal;
and the input end of the OR gate module is respectively connected with the output end of the XOR gate module and the third pulse input end, and the output end of the OR gate module outputs a basic pulse signal.
Wherein, the preferred scheme is: the first pulse input end comprises a first internal pulse input end, a first external pulse input end and a first alternative data gate, the input end of the first alternative data gate is respectively connected with the first internal pulse input end and the first external pulse input end, and the output end of the first alternative data gate is connected with the input end of the exclusive-OR gate module.
Wherein, the preferred scheme is: the second pulse input end comprises a second internal pulse input end, a second external pulse input end and a second alternative data gate, the input end of the second alternative data gate is respectively connected with the second internal pulse input end and the second external pulse input end, and the output end of the second alternative data gate is connected with the input end of the exclusive-OR gate module.
Wherein, the preferred scheme is: the third pulse input end comprises a third internal pulse input end, a third external pulse input end and a third alternative data gate, the input end of the third alternative data gate is respectively connected with the third internal pulse input end and the third external pulse input end, and the output end of the third alternative data gate is connected with the input end of the OR gate module.
Wherein, the preferred scheme is: the pulse waveform modulation system also comprises a pulse internal and external control processing unit, wherein the pulse internal and external control processing unit is respectively connected with the first alternative data gate, the second alternative data gate and the third alternative data gate, and controls the output pulse signal of the first alternative data gate, the output pulse signal of the second alternative data gate and the output pulse signal of the third alternative data gate.
Wherein, the preferred scheme is: the pulse waveform modulation system further includes:
the enhanced pulse triggering module is arranged between the output end of the third pulse input end and the input end of the AND gate module and generates an original enhanced pulse signal;
and the input end of the AND gate module is also connected with the second pulse input end or the first pulse input end, and the output end of the AND gate module outputs an enhanced pulse signal.
Wherein, the preferred scheme is: the pulse waveform modulation system includes a pulse width limiting module in communication with the enhanced pulse trigger module, the pulse width limiting module limiting a maximum width range of an original enhanced pulse signal generated by the enhanced pulse trigger module.
Wherein, the preferred scheme is: the exclusive-or gate module, the first one-out-of-two data strobe, the second one-out-of-one data strobe and the third one-out-of-one data strobe are programmable integrated circuit devices.
Wherein, the preferred scheme is: the enhanced pulse trigger module and the AND gate module are programmable integrated circuit devices.
Compared with the prior art, the pulse waveform modulation system of the laser is designed, and the digital modulation of the laser pulse is realized by using the programmable integrated circuit device, so that the complex PCB (printed circuit board) board-level complex circuit structure is avoided, and uncertain signal factors caused by interference in the pulse signal modulation process are greatly reduced; the programmable integrated circuit device is used for building, the method is simple and easy to implement and high in reliability, and the real-time performance in the circuit transmission operation process is greatly improved; and, it is easy to realize the synchronous trigger generation of the enhancement pulse, but the settable characteristic of the enhancement pulse width, some complicated high-grade demands such as protective control algorithm of the enhancement pulse width, etc. in the programmable integrated circuit device; and the complexity and difficulty of designing and drawing the PCB board level circuit are greatly simplified.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of prior art laser pulse modulation;
FIG. 2 is a schematic diagram of a pulse waveform modulation system according to the present invention;
FIG. 3 is a schematic diagram of the detailed structure of FIG. 2;
FIG. 4 is a schematic diagram of an enhanced pulse based pulse waveform modulation system according to the present invention;
FIG. 5 is a schematic diagram of the detailed structure of FIG. 4;
fig. 6 is a schematic diagram of a pulse waveform modulation system according to the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 2 and 3, the present invention provides a preferred embodiment of a pulse waveform modulation system for a laser.
A pulse waveform modulation system of a laser comprises a first pulse input end 10, a second pulse input end 20, a third pulse input end 30, an exclusive-OR gate module 200 and an OR gate module 300, wherein the input end of the exclusive-OR gate module 200 is respectively connected with the first pulse input end 10 and the second pulse input end 20, and the input end of the OR gate module 300 is respectively connected with the output end of the exclusive-OR gate module 200 and the third pulse input end 30.
Specifically, the first pulse input terminal 10 inputs a first pulse type selection signal; the second pulse input terminal 20 inputs a second pulse type selection signal; the third pulse input terminal 30 inputs a third pulse signal with variable frequency and duty ratio; the output terminal of the xor gate module 200 outputs a continuous wave enable signal; the output of the or gate module 300 outputs a basic pulse signal.
Wherein the first pulse type selection signal and the second pulse type selection signal may be a high level signal or a low level signal.
And setting the frequency and the duty ratio of the basic pulse signal according to the frequency and the duty ratio of the third pulse signal.
The exclusive or gate is a logic gate for realizing logical exclusive or in digital logic. The multi-input exclusive-or gate can be composed of 2-input exclusive-or gates. If the two input levels are different, the output is high level 1; if the two inputs are at the same level, the output is at low level 0. That is, if the two inputs are different, the xor gate outputs a high level. In this embodiment, an exclusive-or gate module 200 is used, and the special composition relationship (for example, table 1) of the first pulse type selection signal and the second pulse type selection signal is used to smartly process the signals into continuous wave enable signals, that is, only when the values of the first pulse type selection signal and the second pulse type selection signal are different, the output of the continuous wave enable signals is enabled.
TABLE 1 laser pulse types
| Pulse type | First pulse type selection signal | Second pulse type selection signal |
| Continuous wave | 0 | 0 |
| Gate pulse | 0 | 1 |
| Intense pulse | 1 | 0 |
| Ultra-pulse | 1 | 1 |
The or gate is also called an or circuit, logic, and circuit. If, of several conditions, an event occurs as long as one is satisfied, this relationship is called an "OR" logical relationship. A circuit having an or logical relationship is called an or gate. The OR gate has a plurality of input ends and an output end, and the output end is high level (logic '1') as long as one of the input ends is high level (logic '1'); the output is low (logic "0") only if all inputs are low (logic "0"). In this embodiment, an or gate circuit is used to combine the continuous wave enable signal and the third pulse signal into a basic pulse signal, that is, when the continuous wave enable signal is "1", the basic pulse value is always "1"; otherwise the base pulse and the third pulse signal change the same.
In the present embodiment, and referring to fig. 3, the first pulse input terminal 10 includes a first internal pulse input terminal 11, a first external pulse input terminal 12, and a first alternative data strobe 101, the input terminals of the first alternative data strobe 101 are respectively connected to the first internal pulse input terminal 11 and the first external pulse input terminal 12, and the output terminals thereof are connected to the input terminals of the xor gate module 200.
Wherein, the first internal pulse input terminal 11 is a pulse waveform type selection signal output port provided inside the laser; while the first external pulse input 12 is a pulse waveform type selection signal provided by the laser processing system (e.g., a cutting machine tool), typically 4 different pulse waveform types are represented by 2 switching value signals.
The circuit which can select any one path of the two-way data strobe in the multi-path data transmission process is called a data selector.
Further, the second pulse input terminal 20 includes a second internal pulse input terminal 21, a second external pulse input terminal 22, and a second one-out-of-one data strobe 102, the input terminals of the second one-out-of-one data strobe 102 are respectively connected to the second internal pulse input terminal 21 and the second external pulse input terminal 22, and the output terminal thereof is connected to the input terminal of the xor gate module 200.
Wherein the second internal pulse input terminal 21 is a pulse waveform type selection signal output port provided inside the laser; while the second external pulse input 22 is a pulse waveform type selection signal provided by the laser processing system (e.g., a cutting machine tool), typically representing 4 different pulse waveform types by 2 switching value signals.
Further, the third pulse input terminal 30 includes a third internal pulse input terminal 31, a third external pulse input terminal 32 and a third alternative data strobe 103, the input terminals of the third alternative data strobe 103 are respectively connected to the third internal pulse input terminal 31 and the third external pulse input terminal 32, and the output terminals thereof are connected to the input terminals of the or gate module 300.
Wherein, the third external pulse input end 32 is a pulse signal with variable frequency and duty ratio provided by the laser processing system; the third internal pulse input terminal 31 is a signal which is generated by the laser and is outputted from the third external pulse input terminal 32, and is used for preventing the processing system from being supplemented when the processing system can not provide the signal.
In this embodiment, and referring to fig. 6, the pulse waveform modulation system further includes a pulse internal and external control processing unit 400, and the pulse internal and external control processing unit 400 is respectively connected to the first two-select data strobe 101, the second two-select data strobe 102, and the third two-select data strobe 103, and controls the output pulse signal of the first two-select data strobe 101, the output pulse signal of the second two-select data strobe 102, and the output pulse signal of the third two-select data strobe 103.
The pulse internal and external control processing unit 400 selects whether the internal pulse or the external pulse is used by one path provided inside the laser.
In this embodiment, the xor gate module 200, the or gate module 300, the first one-out data strobe 101, the second one-out data strobe 102, and the third one-out data strobe 103 are programmable integrated circuit devices.
Specifically, Complex Programmable logic devices such as CPLD (Complex Programmable logic device) and CPLD (Complex Programmable logic device) are developed from PAL and GAL devices, and are relatively large in scale and Complex in structure, and belong to the field of large-scale integrated circuits. The digital integrated circuit is a digital integrated circuit which is used by a user to construct logic functions according to respective needs. Or, for example, FPGA (Field Programmable gate array), FPGA (Field-Programmable gate array), i.e., Field Programmable gate array, which is a product of further development on the basis of Programmable devices such as PAL, GAL, CPLD, etc. The circuit is a semi-custom circuit in the field of Application Specific Integrated Circuits (ASIC), not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited. Alternatively, such as PLD (Programmable Logic Device), which is an abbreviation of Programmable Logic Device, means a Programmable Logic Device, i.e., an integrated circuit that mainly implements digital Logic, and whose function can be changed by programming.
Further, this portion of the pulse modulation functionality may be present integrated into the same programmable logic device as other functions such as I/O (input/output) expansion.
As shown in fig. 4, 5 and 6, the present invention provides a preferred embodiment of an enhanced pulse based pulse waveform modulation system.
The pulse waveform modulation system further comprises an enhanced pulse trigger module 500 and an and gate module 400, wherein the enhanced pulse trigger module 500 is arranged between the output end of the third pulse input end 30 and the input end of the and gate module 400, and the enhanced pulse trigger module 500 generates an original enhanced pulse signal; the input terminal of the and gate module 400 is further connected to the second pulse input terminal 20 or the first pulse input terminal 10, and the output terminal thereof outputs the enhanced pulse signal.
Specifically, referring to fig. 5 and 6, the first pulse input terminal 10 includes a first internal pulse input terminal 11, a first external pulse input terminal 12, and a first alternative data strobe 101, an input terminal of the first alternative data strobe 101 is respectively connected to the first internal pulse input terminal 11 and the first external pulse input terminal 12, an output terminal thereof is connected to one end of an enhanced pulse trigger module 500, and the other end of the enhanced pulse trigger module 500 is connected to an input terminal of the and gate module 400; the third pulse input terminal 30 includes a third internal pulse input terminal 31, a third external pulse input terminal 32 and a third one-out-of-one data strobe 103, the input terminals of the third one-out-of-one data strobe 103 are respectively connected to the third internal pulse input terminal 31 and the third external pulse input terminal 32, and the output terminal thereof is connected to the input terminal of the and gate module 400.
The pulse waveform modulation system further comprises a pulse internal and external control processing unit 400, wherein the pulse internal and external control processing unit 400 is respectively connected with the first two-choice data strobe 101 and the third two-choice data strobe 103 and controls the output pulse signal of the first two-choice data strobe 101 and the output pulse signal of the third two-choice data strobe 103,
Furthermore, the generated basic pulse controls the basic power output in fig. 1, so that two laser pulse waveform types of continuous wave and gate pulse can be obtained; the generated enhanced pulse signal controls the output of enhanced power in the figure 1, and then the laser basic pulse waveform is superposed, so that two waveforms of strong pulse and super pulse can be obtained; both the intense pulse and the super pulse waveforms are generally only suitable for lasers which can bear continuous high spike pulses, such as the current CO2 laser.
In this embodiment, the pulse waveform modulation system includes a pulse width limiting module associated with the enhanced pulse trigger module 500, which limits the maximum width range of the original enhanced pulse signal generated by the enhanced pulse trigger module 500.
In this embodiment, the enhanced pulse trigger block 500 and the and gate block 400 are programmable integrated circuit devices.
Specifically, Complex Programmable logic devices such as CPLD (Complex Programmable logic device) and CPLD (Complex Programmable logic device) are developed from PAL and GAL devices, and are relatively large in scale and Complex in structure, and belong to the field of large-scale integrated circuits. The digital integrated circuit is a digital integrated circuit which is used by a user to construct logic functions according to respective needs. Or, for example, FPGA (Field Programmable gate array), FPGA (Field-Programmable gate array), i.e., Field Programmable gate array, which is a product of further development on the basis of Programmable devices such as PAL, GAL, CPLD, etc. The circuit is a semi-custom circuit in the field of Application Specific Integrated Circuits (ASIC), not only overcomes the defects of the custom circuit, but also overcomes the defect that the number of gate circuits of the original programmable device is limited. Alternatively, such as PLD (Programmable Logic Device), which is an abbreviation of Programmable Logic Device, means a Programmable Logic Device, i.e., an integrated circuit that mainly implements digital Logic, and whose function can be changed by programming.
Further, the following requirements need to be satisfied in the process of programming the enhanced pulse trigger module 500:
a. when a selected pulse signal (a first pulse type selection signal or a second pulse type selection signal) comes, synchronously triggering to generate an enhanced pulse;
b. the generated enhanced pulse width can be set as required;
c. generating the enhanced pulse width requires an associated protection algorithm to prevent it from accidentally exceeding the maximum width range. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather as embodying the invention in a wide variety of equivalent variations and modifications within the scope of the appended claims.
Claims (9)
1. A pulse waveform modulation system for a laser, the pulse waveform modulation system comprising:
a first pulse input terminal to which a first pulse type selection signal is input;
a second pulse input terminal to which a second pulse type selection signal is input;
a third pulse input terminal to which a third pulse signal of variable frequency and duty ratio is input;
the input end of the exclusive-OR gate module is respectively connected with the first pulse input end and the second pulse input end, and the output end of the exclusive-OR gate module outputs a continuous wave enable signal;
and the input end of the OR gate module is respectively connected with the output end of the XOR gate module and the third pulse input end, and the output end of the OR gate module outputs a basic pulse signal.
2. The pulse waveform modulation system of claim 1, wherein: the first pulse input end comprises a first internal pulse input end, a first external pulse input end and a first alternative data gate, the input end of the first alternative data gate is respectively connected with the first internal pulse input end and the first external pulse input end, and the output end of the first alternative data gate is connected with the input end of the exclusive-OR gate module.
3. The pulse waveform modulation system of claim 2, wherein: the second pulse input end comprises a second internal pulse input end, a second external pulse input end and a second alternative data gate, the input end of the second alternative data gate is respectively connected with the second internal pulse input end and the second external pulse input end, and the output end of the second alternative data gate is connected with the input end of the exclusive-OR gate module.
4. The pulse waveform modulation system of claim 3, wherein: the third pulse input end comprises a third internal pulse input end, a third external pulse input end and a third alternative data gate, the input end of the third alternative data gate is respectively connected with the third internal pulse input end and the third external pulse input end, and the output end of the third alternative data gate is connected with the input end of the OR gate module.
5. The pulse waveform modulation system of claim 4, wherein: the pulse waveform modulation system also comprises a pulse internal and external control processing unit, wherein the pulse internal and external control processing unit is respectively connected with the first alternative data gate, the second alternative data gate and the third alternative data gate, and controls the output pulse signal of the first alternative data gate, the output pulse signal of the second alternative data gate and the output pulse signal of the third alternative data gate.
6. The pulse waveform modulation system of claim 1, wherein: the pulse waveform modulation system further includes:
the enhanced pulse triggering module is arranged between the output end of the third pulse input end and the input end of the AND gate module and generates an original enhanced pulse signal;
and the input end of the AND gate module is also connected with the second pulse input end or the first pulse input end, and the output end of the AND gate module outputs an enhanced pulse signal.
7. The pulse waveform modulation system of claim 6, wherein: the pulse waveform modulation system includes a pulse width limiting module in communication with the enhanced pulse trigger module, the pulse width limiting module limiting a maximum width range of an original enhanced pulse signal generated by the enhanced pulse trigger module.
8. The pulse waveform modulation system according to any one of claims 1 to 5, wherein: the exclusive-or gate module, the first one-out-of-two data strobe, the second one-out-of-one data strobe and the third one-out-of-one data strobe are programmable integrated circuit devices.
9. The pulse waveform modulation system of claim 6, wherein: the enhanced pulse trigger module and the AND gate module are programmable integrated circuit devices.
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Effective date of registration: 20210409 Address after: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee after: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Patentee after: Shenzhen Han's photon laser technology Co.,Ltd. Address before: 518000 No. 9988 Shennan Road, Nanshan District, Shenzhen, Guangdong Patentee before: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. |