CN101396758B - Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit - Google Patents
Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit Download PDFInfo
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- CN101396758B CN101396758B CN2008102008271A CN200810200827A CN101396758B CN 101396758 B CN101396758 B CN 101396758B CN 2008102008271 A CN2008102008271 A CN 2008102008271A CN 200810200827 A CN200810200827 A CN 200810200827A CN 101396758 B CN101396758 B CN 101396758B
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Abstract
A multifunctional main circuit of a micro-plasma arc welding main arc power source of the invention relates to the technical field of welding source and comprises an input rectifying filter circuit, a power switching element, an intermediate frequency transformer, an output rectifying filter circuit, a current feedback circuit, an inversion control drive circuit, and simultaneously the input end of a functional select switch (1) is connected one end of the output rectifying filter circuit, one output end of the functional select switch (1) is simultaneously connected with a high-frequency switching circuit (2) and a basic value output circuit (3), the other output end of the functional select switch (1) is connected with a workpiece (12) through a current sensor (11), and both ends of a high-frequency filter circuit (4) are respectively connected with the current feedback circuit and the current sensor (11). The invention leads the main circuit of a micro-plasma arc welding main arc power source to realize multifunctional output of direct current, low-frequency pulse, high-frequency pulse, mixed pulse, etc.
Description
Technical field
The present invention relates to source of welding current technical field, specifically refer to the main circuit of the multi-functional output of a kind of micro-plasma arc welding power supply.
Background technology
The welding current scope of micro-plasma arc welding is 0.02A～30A, between minimum current and the maximum current, current range reaches 3 orders of magnitude, be suitable for the welding of the strict technological requirement of various differences of thin fine structure part such as thin, cutting, remelting, spraying, the material Precision Machining and the surface modification of defect mending etc., micro-plasma arc welding is welded, cutting, remelting, spraying, these different material Precision Machining and surface modification technologies such as defect mending, the welding current waveform that requires is inequality, and for a kind of material Precision Machining of micro-plasma arc welding or material surface modifying technology in the varying number level, welding current in the same order of magnitude is also inequality to the requirement of its current waveform even.The existing micro-plasma arc welding source of welding current adopts the main circuit form of thyristor supply, analogue-digital conversion power supply, inverter, the main circuit of thyristor supply is owing to be subjected to the restriction of himself main circuit structure, can only realize the direct current welding current waveform, and the main circuit of thyristor supply is huge and heavy; The main circuit of inverter can only be exported direct current or low-frequency pulse welding current waveform owing to be subjected to the restriction of reverse frequency; The main circuit of analogue-digital conversion power supply can be realized the welding current waveform output of random waveform, but the power pack of forming the main circuit intermediate power amplifier spare of analogue-digital conversion power supply because of industrial frequency AC transformation, rectification, filtering, the transformer heaviness, bulky, and the power consumption of power amplifying device is big, can not reach energy conservation and environment protection.
Through prior art patent and literature search are found, number of patent application is 89106259.9 Chinese invention patent " microbunch plasma arc special welding machine ", this patent has proposed a kind of transistor type Arc Welding Power that is used for micro-plasma arc welding, and this Arc Welding Power has been realized high-frequency impulse output; But the power pack of analog transistor adopts general industrial frequency AC transformation, rectification, filtered version in this Arc Welding Power, the transformer heaviness, and bulky, more fatal is that power consumption is big, can't reach energy conservation and environment protection.Another number of patent application is 89109052.5 Chinese invention patent " transistorized arch welding inverter ", and this patent has proposed a kind of arc welding inverter, and this Arc Welding Power has been realized direct current and pulse output; But the highest frequency of this Arc Welding Power pulse output has only 200HZ, can't realize high frequency (tens kHz) the pulse output that the meticulous micro-plasma arc welding of fine structure parts such as ultra-thin, ultra-fine connects.Simultaneously, these two patents all can't realize the multi-functional output of a source of welding current.
Summary of the invention
The objective of the invention is to overcome deficiency and the defective that above-mentioned prior art exists, the main circuit of the multi-functional output of a kind of micro-plasma arc welding power supply is provided, make it solve existing micro-beam plasma arc welding power-supply heaviness on the one hand, bulky problem makes it more to be adapted to the welding equipment of energy-conserving and environment-protective; Also make the micro-plasma welding equipment of this energy-conserving and environment-protective realize a plurality of function output modes such as direct current output, low-frequency pulse output, high-frequency impulse output, mixed pulses output on the other hand, the welding equipment of key technical problem such as the material Precision Machining and the surface modification of welding that the various different process that are suitable for fine structure parts such as approaching, thin require, cutting, remelting, spraying, defect mending etc. is provided and solves different size distortion when approaching fine structure parts precision such as thin and welding, burn.
Technical scheme of the present invention: comprise the input rectifying filter circuit, power switch component, intermediate-frequency transformer, output rectifier and filter, current feedback circuit, the inversion control drive circuit, functional select switch, high-frequency switch circuit, the base value output circuit, high-frequency filter circuit, the input of functional select switch is connected with an end of output rectifier and filter, an output of functional select switch is connected with the base value output circuit with high-frequency switch circuit simultaneously, another output of functional select switch passes current sensor and is connected with workpiece, one end of high-frequency filter circuit is connected with current feedback circuit, the other end of high-frequency filter circuit is connected with current sensor, and the other end of output rectifier and filter is connected with tungsten bar.High-frequency switch circuit is by high frequency switching transistor, the HF switch drive circuit, the HF switch control circuit is formed, the base value output circuit is by analog transistor, analog drive transistor, analog control circuit is formed, be connected with the HF switch drive circuit between high frequency switching transistor and the HF switch control circuit, be connected with analog drive transistor between analog transistor and the analog control circuit, one end of high frequency switching transistor and analog transistor one end all are connected with functional select switch, and the other end of high frequency switching transistor and the other end of analog transistor all pass current sensor and be connected with workpiece.
In the main circuit of the present invention, high-frequency switch circuit, base value output circuit are formed the rear end high frequency output or the mixed pulses output of micro-beam plasma arc welding main-arc power-supply main circuit, input rectifying filter circuit, power switch component, intermediate-frequency transformer, output rectifier and filter are formed the front end direct current or the low-frequency pulse output of micro-beam plasma arc welding main-arc power-supply main circuit, also as the power supply of output of rear end high frequency or mixed pulses output.
A key technology of main circuit of the present invention is between front end direct current or low-frequency pulse output and output of rear end high frequency or mixed pulses output functional select switch to be arranged, switch by this functional select switch that to select direct current output or low-frequency pulse output mode still be high-frequency impulse output or mixed pulses output mode: when functional select switch switched to the rear end high frequency output of micro-beam plasma arc welding main-arc power-supply main circuit or mixed pulses output, this main circuit was operated in high-frequency impulse and exports or the mixed pulses output mode; When functional select switch did not switch to the rear end high frequency output of micro-beam plasma arc welding main-arc power-supply main circuit or mixed pulses output, this main circuit was operated in direct current output or low-frequency pulse output mode.
Another key technology of main circuit of the present invention is to adopt high-frequency switch circuit, the base value output circuit is realized the high-frequency impulse output or the mixed pulses output of micro-beam plasma arc welding main-arc power-supply main circuit, when functional select switch switches to the rear end high frequency output of micro-beam plasma arc welding main-arc power-supply main circuit or mixed pulses output, control and pass through the driving of HF switch drive circuit by the HF switch control circuit, turn-on and turn-off high frequency switching transistor alternately fast, when the controlled conducting of high frequency switching transistor, micro-beam plasma arc welding main-arc power-supply main circuit output high frequency peaks; When the controlled shutoff of high frequency switching transistor, micro-beam plasma arc welding main-arc power-supply main circuit output high frequency base value.High-frequency impulse output mode or mixed pulses output mode depend on front end direct current or low-frequency pulse output, if front end direct current or low-frequency pulse output are operated in direct current output, then micro-beam plasma arc welding main-arc power-supply main circuit is the high-frequency impulse output mode; If front end direct current or low-frequency pulse output are operated in low-frequency pulse output, then micro-beam plasma arc welding main-arc power-supply main circuit is the mixed pulses output mode.
Another key technology of main circuit of the present invention is that analog transistor by the base value output circuit is as variable resistor, this variable resistor drives by analog control circuit control and through analog drive transistor and changes its resistance value, purpose with the amplitude that reaches independent regulation high frequency base value, the amplitude of high frequency peaks is then by inversion control drive circuit control front end direct current or the output of low-frequency pulse output, to guarantee the adjustable purpose of independence of high frequency peaks and high frequency base value.
The accurate welding of fine structure part such as thin, thin, cutting, remelting, spraying, defect mending etc. require meticulous technological parameter control and different output, and each parameter of the pulse output that pulse arc welding that particularly different accurate welding need especially and the butt welding of high-frequency impulse arc welding connect electric power main circuit independently controls to adjust and proposed very high requirement.Main circuit of the present invention is by adopting the structure of output of front end direct current or low-frequency pulse output and rear end high frequency or mixed pulses output, reach high frequency frequency, high frequency dutycycle, the high frequency peaks of low frequency frequency, low frequency dutycycle, low frequency peak value, low frequency base value, the high-frequency impulse output of respectively independent regulation direct current output amplitude, low-frequency pulse output, the independent regulation of nine parameters of high frequency base value, and, realize a plurality of function output modes such as direct current output, low-frequency pulse output, high-frequency impulse output, mixed pulses output by functional select switch.
In sum, the present invention has following characteristics:
1. utilize power supply, the high-frequency switch circuit of functional select switch, front end inverter structure, the combining structure of base value output circuit, can obtain the output mode of a plurality of functions such as direct current, low-frequency pulse, high-frequency impulse, mixed pulses;
2. utilize the power supply of high-frequency switch circuit, front end inverter structure, the independent regulation separately that the base value output circuit is realized micro-beam plasma arc welding main-arc power-supply multifunctional main circuit multi-parameter (high-frequency impulse peak value, high-frequency impulse base value, high-frequency impulse frequency, high-frequency impulse dutycycle, low-frequency pulse peak value, low-frequency pulse base value, low-frequency pulse frequency, low-frequency pulse dutycycle, direct current);
3. utilize the front end direct current of micro-beam plasma arc welding main-arc power-supply main circuit or the inverter structure of low-frequency pulse output, reduce the volume and weight of micro-beam plasma arc welding power-supply greatly, simultaneously to a great extent, improved the dynamic characteristic and the reliability of operation of the source of welding current, and made micro-beam plasma arc welding power-supply satisfy energy conservation and environment protection.
Description of drawings
Fig. 1 micro-beam plasma arc welding main-arc power-supply multifunctional main circuit structured flowchart of the present invention;
The multi-functional output waveform figure of Fig. 2 micro-beam plasma arc welding main-arc power-supply main circuit of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples
Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit of the present invention (as shown in Figure 1), comprise input rectifying filter circuit, power switch component, intermediate-frequency transformer, output rectifier and filter, current feedback circuit, inversion control drive circuit, and functional select switch 1, high-frequency switch circuit 2, base value output circuit 3, high-frequency filter circuit 4 compositions such as grade.Its annexation is:
The input of functional select switch 1 is connected with an end of output rectifier and filter, an output of functional select switch 1 is connected with base value output circuit 3 with high-frequency switch circuit 2 simultaneously, another output of functional select switch 1 passes current sensor 11 and is connected with workpiece 12, one end of high-frequency filter circuit 4 is connected with current feedback circuit, the other end of high-frequency filter circuit 4 is connected with current sensor 11, and the other end of output rectifier and filter is connected with tungsten bar 13.
High-frequency switch circuit 2 is by high frequency switching transistor 5, HF switch drive circuit 6, HF switch control circuit 7 is formed, base value output circuit 3 is by analog transistor 8, analog drive transistor 9, analog control circuit forms 10, be connected with HF switch drive circuit 6 between high frequency switching transistor 5 and the HF switch control circuit 7, be connected with analog drive transistor 9 between analog transistor 8 and the analog control circuit 10, one end of high frequency switching transistor 5 and analog transistor 8 one ends all are connected with functional select switch 1, and the other end of the other end of high frequency switching transistor 5 and analog transistor 8 all passes current sensor 11 and is connected with workpiece 12.
The composition of main-arc power-supply multifunctional main circuit has front end direct current or low-frequency pulse output, function selection, the output of rear end high frequency or three parts of mixed pulses output.Front end direct current or low-frequency pulse output are that the input rectifying filter circuit becomes high voltage direct current with the electrical network industrial-frequency alternating current, become high pressure through power switch component again, high frequency ac signal, then by intermediate-frequency transformer, output rectifier and filter is with high pressure, the inversion high frequency ac signal becomes direct current or low-frequency pulse output, and power supply as high frequency switching transistor 5 and analog transistor 8, direct current still is the setting that the inversion control drive circuit is depended in the output of low-frequency pulse, when being set at direct current, then the inversion control drive circuit is given at direct current and is fixed control front end direct current or low-frequency pulse output output direct current, when being set at pulse, then the inversion control drive circuit is in the low frequency frequency, the low frequency dutycycle, the low frequency peak value, the low frequency base value is given and is fixed control front end direct current or the pulse of low-frequency pulse output output low frequency.It is to select by switch switching the carrying out output mode of functional select switch 1 that function is selected part, when functional select switch 1 switches to rear end high frequency output or mixed pulses outgoing position, then select high frequency output or mixed pulses output mode, the high frequency output mode still is that the mixed pulses output mode depends on front end direct current or low-frequency pulse output, if front end direct current or the output of low-frequency pulse output is direct current, it then is the high frequency output mode, if front end direct current or the output of low-frequency pulse output is low-frequency pulse, then is the mixed pulses output modes; When functional select switch 1 does not switch to rear end high frequency output or mixed pulses outgoing position, then select direct current output or low-frequency pulse output mode, the direct current output mode still is that the low-frequency pulse output mode depends on front end direct current or low-frequency pulse output, if front end direct current or the output of low-frequency pulse output is direct current, it then is the direct current output mode, if front end direct current or the output of low-frequency pulse output is low-frequency pulse, then is the low-frequency pulse output mode.Rear end high frequency output or mixed pulses output are by high-frequency switch circuit 2, base value output circuit 3 is formed, high-frequency switch circuit 1 is that HF switch control circuit 7 is in the high frequency frequency, the high frequency dutycycle is given to fix by HF switch drive circuit 6 and is driven the turn-on and turn-off alternately fast of controlling high frequency switching transistor 5, when the controlled conducting of high frequency switching transistor, the base value output circuit is inoperative, micro-beam plasma arc welding main-arc power-supply main circuit output high frequency peaks, when the controlled shutoff of high frequency switching transistor, the base value output circuit works, micro-beam plasma arc welding main-arc power-supply main circuit output high frequency base value; Base value output circuit 3 is that analog control circuit 10 drives the output of controlling analog transistor 8 at the high frequency base value to fixing by analog drive transistor 9, i.e. micro-beam plasma arc welding main-arc power-supply main circuit output high frequency base value.Front end direct current or low-frequency pulse output independent regulation direct current, high-frequency impulse peak value, low-frequency pulse frequency, low-frequency pulse dutycycle, low-frequency pulse peak value, 6 parameters of low-frequency pulse base value; High-frequency switch circuit 2 independent regulation high-frequency impulse frequencies and 2 parameters of high-frequency impulse dutycycle in rear end high frequency output or the mixed pulses output, 1 parameter of base value output circuit 3 independent regulation high-frequency impulse base values.
High-frequency filter circuit 4 is by current sensor 11 fast detecting and the synchronous high-frequency current signal of high-frequency impulse output, and elimination high fdrequency component, by current feedback circuit, form the current feedback signal of inversion control drive circuit, obtain the constant-current supply external characteristics of multi-functional output.
The multi-functional output waveform figure (as shown in Figure 2) of micro-beam plasma arc welding main-arc power-supply main circuit of the present invention, the waveform of output comprises the waveform of direct current, low-frequency pulse, high-frequency impulse, these four kinds of patterns of mixed pulses, and the waveform of these four kinds of patterns is respectively accompanying drawing 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d).Can regulate direct current in the accompanying drawing 2 (a), can regulate low-frequency pulse frequency, low-frequency pulse dutycycle, low-frequency pulse peak value, low-frequency pulse base value in the accompanying drawing 2 (b), high-frequency impulse peak value, high-frequency impulse base value, high-frequency impulse frequency, high-frequency impulse dutycycle can be regulated in the accompanying drawing 2 (c), low-frequency pulse frequency, low-frequency pulse dutycycle, low-frequency pulse peak value, low-frequency pulse base value, high-frequency impulse peak value, high-frequency impulse base value, high-frequency impulse frequency, high-frequency impulse dutycycle can be regulated in the accompanying drawing 2 (d).
Claims (1)
1. micro-beam plasma arc welding main-arc power-supply multifunctional main circuit, comprise: the input rectifying filter circuit, power switch component, intermediate-frequency transformer, output rectifier and filter, current feedback circuit, the inversion control drive circuit, it is characterized in that, also comprise: functional select switch (1), high-frequency switch circuit (2), base value output circuit (3), high-frequency filter circuit (4), the input of functional select switch (1) is connected with an end of output rectifier and filter, an output of functional select switch (1) is connected with base value output circuit (3) with high-frequency switch circuit (2) simultaneously, another output of functional select switch (1) passes current sensor (11) and is connected with workpiece (12), one end of high-frequency filter circuit (4) is connected with current feedback circuit, the other end of high-frequency filter circuit (4) is connected with current sensor (11), and the other end of output rectifier and filter is connected with tungsten bar (13);
Described high-frequency switch circuit (2) is made up of high frequency switching transistor (5), HF switch drive circuit (6), HF switch control circuit (7), high frequency switching transistor (5) is connected with HF switch control circuit (7) through HF switch drive circuit (6), and the two ends of high frequency switching transistor (5) are connected with functional select switch (1) respectively and pass current sensor (11) and be connected with workpiece (12);
Described base value output circuit (3) is made up of analog transistor (8), analog drive transistor (9), analog control circuit (10), be connected with analog drive transistor (9) between analog transistor (8) and the analog control circuit (10), one end of analog transistor (8) is connected with functional select switch (1), and the other end of analog transistor (8) passes current sensor (11) and is connected with workpiece (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102008271A CN101396758B (en) | 2008-10-07 | 2008-10-07 | Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit |
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| CN2008102008271A CN101396758B (en) | 2008-10-07 | 2008-10-07 | Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit |
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| CN101396758A CN101396758A (en) | 2009-04-01 |
| CN101396758B true CN101396758B (en) | 2011-04-20 |
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| CN2008102008271A Expired - Fee Related CN101396758B (en) | 2008-10-07 | 2008-10-07 | Micro-beam plasma arc welding main-arc power-supply multifunctional main circuit |
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Granted publication date: 20110420 Termination date: 20131007 |