CN202910439U - Digital control multifunction inverted arc welding machine - Google Patents
Digital control multifunction inverted arc welding machine Download PDFInfo
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- CN202910439U CN202910439U CN 201220630953 CN201220630953U CN202910439U CN 202910439 U CN202910439 U CN 202910439U CN 201220630953 CN201220630953 CN 201220630953 CN 201220630953 U CN201220630953 U CN 201220630953U CN 202910439 U CN202910439 U CN 202910439U
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Abstract
The utility model relates to an inverted arc welding machine, in particular to a digital control multifunction inverted arc welding machine which is high in work efficiency and fast in dynamic response. The digital control multifunction inverted arc welding machine comprises main circuit system (1) of an insulated gate bipolar translator (IGBT) inverted circuit (101), a digital control system (2) and a human-machine exchange system (3). A digital signal controller (4) thereof is used as a core control unit for the digital control system (2). The digital control multifunction inverted arc welding machine further comprises auxiliary circuits (5) which are respectively connected with digital signal controller (4), a signal processing circuit (6) which is used for processing gathered data of the main circuit system (1), and an IGBT drive circuit (7) which is used for drive controlling the IGBT inverted circuit (101). The model number of digital signal controller (4) is dsPIC30F4011. The digital signal controller (4) is connected with the IGBT inverted circuit (101) through the IGBT drive circuit (7) to enable the main circuit system (1) to be in regulation control.
Description
Technical field
The utility model relates to a kind of inverter arc welding machine, is specially a kind of digital control multi-functional inverter arc welding machine.
Background technology
Inversion and rectification are two opposite concepts, and rectification is that alternating current is transformed to galvanic process, and inversion then is the process of direct current being changed into alternating current, adopt the Arc Welding Power of inversion transformation technique to be called inverter type welder, are also referred to as inverter arc welding machine.Inversion process need high-power electronic switch device, adopt insulated gate bipolar transistor IGBT as switching device inverter type welder be called the IGBT inverter type welder.The inversion welding and cutting device is comprised of inverter and external equipment.Inverter is the capital equipment of inversion welding and cutting device, its course of work is: industrial frequency AC-direct current-high-frequency ac-transformation-direct current, it is to obtain a more level and smooth direct current after three-phase or single-phase 50Hz industrial frequency AC electric rectification, the filtering, the inverter circuit that is comprised of IGBT or FET becomes this direct current in the alternating current of 15～100kHz, after the step-down of intermediate frequency main transformer, again rectifying and wave-filtering obtain the output welding current of direct current stably or again inversion export the alternating current of required frequency.The control circuit of inversion welding and cutting device is comprised of given circuit and drive circuit etc., by the feedback of voltage, current signal is processed, realize the complete machine loop control, adopting pulse-width modulation PWM is the control technology of core, thereby obtains constant-current characteristics and the excellent welding technological effect of quick pulsewidth modulation.
Inverter type welder develops into now, has experienced three phases, and first on behalf of the IGCT inverter type welder, and its reverse frequency is 2～3kHz; The second generation is the high power transistor inverter type welder, the nearly 20kHz of reverse frequency; The third generation is Iusulated gate semiconductor switching device (IGBT module, single tube MOSFET) inverter type welder, and reverse frequency can be brought up to more than 15～100kHz, becomes the main flow of inverter type welder.Present inverter type welder developed into the 4th generation product, both inverter type welders of Digital Control, the problems that occur in first three simulation control for product have been overcome to a certain extent, for example, that complex data is processed is limited in one's ability, component number is many, and the parameter of controller is determined that by the parameter of the discrete elements such as resistance, electric capacity the debugging of controller is complicated, very flexible; The parameter distribution of resistance, electric capacity is on the inconsistency that affects of controller simultaneously, and Parameter stability is poor, is difficult to accomplish high accuracy control; And to realize multi-functional selection, not only circuit design difficulty, and the compatibility of circuit elements device and coordination are also very huge.
But in the inverter type welder of existing Digital Control, what adopt is that digital signal processor (dsp) carries out the control of circuit, it has very strong numerical computations ability, but its incident management ability is relatively poor, output characteristics is single, although can realize unifunctional accurate control, to still can not well realizing in the multi-functional realization; Simultaneously because the restriction of technology, what it all adopted is the monotype gauge tap power supply of PFM or PWM, although it is low that most widely used PWM pattern has a noise, full load is the high advantage of efficient, but lacking, it can not well give play to characteristics when low load, its efficient also far below the control of PFM pattern, has therefore affected the lifting of inverter type welder efficient.
The utility model content
The utility model provides a kind of full-digital control in order to solve above-described problems of the prior art, has many output characteristics, high efficiency, the digital control multi-functional inverter arc welding machine that dynamic response is fast.
The digital control multi-functional inverter arc welding machine of the utility model, comprise the main circuit system 1 that connects successively, numerical control system 2 and man-machine exchange system 3, main circuit system 1 comprises IGBT inverter circuit 101, it is characterized in that, described numerical control system 2 adopts digital signal controller 4 to do key control unit, also comprise the auxiliary circuit 5 that is connected with digital signal controller 4 respectively, for the treatment of the signal conditioning circuit 6 of main circuit system 1 data that collect, and for the IGBT drive circuit 7 that IGBT inverter circuit 101 is driven control; The model of digital signal controller 4 is dsPIC30F4011, and it is connected with IGBT inverter circuit 101 by IGBT drive circuit 7, is used for main circuit system 1 is regulated control; Be provided with the PWM/PFM modulation module 701 for PWM and PFM combined modulation in the described IGBT drive circuit 7.
Further, described IGBT drive circuit 7 is connected with pwm signal input port (PWM1L-PWM2H) on the digital signal controller 4 by its control signal input.
Further, described man-machine exchange system 3 comprises display driver circuit 301, is used for the parameter of main circuit system 1 is connected to the preset parameter regulating circuit 302 that digital signal controller 4 presets adjusting by display driver circuit 301; Be connected with on the display driver circuit 301 for the function selector circuit 304 of selecting welding manner with for the display 303 that shows main circuit system 1 information.
Further, described display driver circuit 301 is connected with input/output port (I/O) on the digital signal controller 4.
Further, described man-machine exchange system 3 also comprises for the real-time regulating circuit 305 of parameter that the parameter of main circuit system 1 is undertaken by digital signal controller 4 directly regulate in real time; The real-time regulating circuit 305 of parameter is connected with analog channel port (AN) on the digital signal controller 4.
Further, described digital signal controller 4 is connected with ancillary equipment 8 by auxiliary circuit 5, auxiliary circuit 5 comprises the RS-232C interface 501 that connects by the synchronous serial port on the digital signal controller 4 (SPI1), and ancillary equipment 8 comprises the computer 801 that is connected with RS-232C interface 501.
Further, described auxiliary circuit 5, also comprise with digital signal controller 4 on crystal oscillator input port (OSC1) be connected OSC2 with the crystal oscillator output port) oscillating circuit 502 that is connected, the reset circuit 503 that is connected with the RESET input mouth (MCLR) on the digital signal controller 4, (VREF+ is connected the reference voltage circuit 504 that is connected with VREF-with analog reference voltage input port on the digital signal controller 4, the PWM fault lockout circuit 505 that is connected with fault input port (FLTA) on the digital signal controller 4, and the warning circuit 506 that is connected with input/output port (I/O) on the digital signal controller 4 respectively, hydraulic pressure testing circuit 507, electron gas valve controling circuit 508 and high-frequency arc strike control circuit 509.
Further, described main circuit system 1, also comprise the power supply 102, LC filter circuit 103, input rectification circuit 104, the filter circuit 105 that are connected to IGBT inverter circuit 101 inputs in turn, and the power transformer 106, output rectification circuit 107 and the lead-out terminal that are connected to IGBT inverter circuit 101 outputs in turn; Described lead-out terminal comprises negative output terminal 108 and the positive output terminal 109 that is connected on the output rectification circuit 107.
Further, be provided with current sensor 110 between described output rectification circuit 107 and the negative output terminal 108, be disposed with voltage sensor 111 and hf arc starter 112 between output rectification circuit 107 and the positive output terminal 109; Described current sensor 110 is connected with voltage sensor and is connected with signal conditioning circuit 6 respectively, and together forms and be connected to the sample circuit 9 of simulating access port (AN) on the digital signal controller 4.
Further again, described hf arc starter 112 is connected with input/output port (I/O) on the digital signal controller 4.
Adopt technical scheme described in the utility model, the contrast prior art, its beneficial effect is as follows.
1) controls by the core of digital signal controller 4, cooperate the cooperation of PWM/PEM modulation module 701 in the IGBT drive circuit 7, realized totally digitilized pulse modulation technology, rapid dynamic response speed, static properties is accurate, the electric current dynamic range of output in the main circuit system 1 is increased greatly, make its short circuit current can get at 2A, can realize simultaneously seamless switching and high accuracy control that electric current is regulated, control rapidly, efficient energy-saving obtains comparatively ideal external characteristic curve shape, satisfies welding process requirement.
2) because adopting, digital signal controller 4 chosen the dsPIC30F4011 chip, therefore can be under the condition that does not increase the additional circuit components and parts, utilize its outstanding data to process and the logic control ability, can embody multiple output characteristics, the platform of realizing several functions is provided, can realize integrating direct current/pulse TIG welding, MMA continuously/discontinuous welding four kinds of functions, feature richness, strong adaptability, good product consistency, stable and reliable for performance.
3) utilize the preset parameter regulating circuit 302 that in man-machine exchange system 3, arranges and the real-time regulating circuit 305 of parameter can be to main circuit system 1 in the parameter of output current realize that the overall process of parameter regulates, and can select by 304 pairs of welding manners of function selector circuit and function in advance, and show by display 303, be applicable to the welding of full position and thin plate.
4) the RS-232C interface in auxiliary circuit 5 can be connected with external computer 801, realizes remote upgrade, control, diagnosis, debugging and monitoring to welding process, can also realize implantation and the storage of welding data simultaneously, and the program download etc.; Can also utilize other circuit butt welding machines that arrange in the auxiliary circuit 5 to advance and comprehensively monitor, manage and protection, reasonable in design, simple in structure, safe and reliable.
Description of drawings
Fig. 1 is the structural principle block diagram described in the utility model example.
Fig. 2 is the numerical control system structural principle block diagram described in the utility model example.
Among the figure: main circuit system 1, numerical control system 2, man-machine exchange system 3, digital signal controller 4, auxiliary circuit 5, signal conditioning circuit 6, IGBT drive circuit 7, ancillary equipment 8, sample circuit 9, IGBT inverter circuit 101, power supply 102, LC filter circuit 103, input rectification circuit 104, filter circuit 105, power transformer 106, output rectification circuit 107, negative output terminal 108, positive output terminal 109, current sensor 110, voltage sensor 111, hf arc starter 112, display driver circuit 301, preset parameter regulating circuit 302, display 303, function selector circuit 304, the real-time regulating circuit 305 of parameter, RS-232C interface 501, oscillating circuit 502, reset circuit 503, reference voltage circuit 504, PWM fault lockout circuit 505, warning circuit 506, hydraulic pressure testing circuit 507, electron gas valve controling circuit 508, high-frequency arc strike control circuit 509, PWM/PFM modulation module 701, computer 801, pwm signal input port (PWM1L-PWM2H), analog channel port (AN), crystal oscillator input port (OSC1), crystal oscillator output port (OSC2), the RESET input mouth (MCLR), analog reference voltage input port (VREF+ and VREF-), fault input port (FLTA), input/output port (I/O).
The specific embodiment
Below in conjunction with specific embodiment, the utility model further is described, explains and illustrates.
The digital control multi-functional inverter arc welding machine of the utility model, as shown in Figure 1, it comprises the main circuit system 1 that connects successively, numerical control system 2 and man-machine exchange system 3, main circuit system 1 comprises IGBT inverter circuit 101, wherein, numerical control system 2 adopts digital signal controller 4 to do key control unit, also comprise the auxiliary circuit 5 that is connected with digital signal controller 4 respectively, for the treatment of the signal conditioning circuit 6 of main circuit system 1 data that collect, and for the IGBT drive circuit 7 that IGBT inverter circuit 101 is driven control; The model of digital signal controller 4 is dsPIC30F4011, and it is connected with IGBT inverter circuit 101 by IGBT drive circuit 7, is used for main circuit system 1 is regulated control; Be provided with the PWM/PFM modulation module 701 for PWM and PFM combined modulation in the described IGBT drive circuit 7.The dsPIC30F4011 chip that numeral model controller 4 adopts, can be by arranging and the Input Software algorithm comes waveform to its output, eurypalynous control is carried out in pulse, thereby reach multi-functional requirement, also need not to increase other electronic devices and components, so that the high conformity of welding machine, stable and reliable for performance, and the cooperation of adding PWM/PFM modulation module 701 realizes the digitlization of IGBT inverter circuit 101 is accurately controlled, combined modulation with PWM and PFM, reach the seamless switching of electric current and to the control of the high accuracy of electric current, reduce reactive loss, improved power factor.
Wherein, as shown in Figure 2, IGBT drive circuit 7 is connected realization digitlization pulsewidth modulation by its control signal input with pwm signal input port (PWM1L-PWM2H) on the digital signal controller 4; Wherein, as shown in Figure 1, described man-machine exchange system 3 comprises display driver circuit 301, is used for the parameter of main circuit system 1 is connected to the preset parameter regulating circuit 302 that digital signal controller 4 presets adjusting by display driver circuit 301; Be connected with on the display driver circuit 301 for the function selector circuit 304 of selecting welding manner with for the display 303 that shows main circuit system 1 information, can realize the preposition adjusting to current parameters; Wherein, as shown in Figure 2, display driver circuit 301 is connected with input/output port (I/O) on the digital signal controller 4; Wherein, as depicted in figs. 1 and 2, man-machine exchange system 3 also comprises for the real-time regulating circuit 305 of parameter that the parameter of main circuit system 1 is undertaken by digital signal controller 4 directly regulate in real time; The real-time regulating circuit 305 of parameter is connected with analog channel port (AN) on the digital signal controller 4, input by analog signal, digitlization conversion by Digital Signals 4 settling signals, realize the real-time control to electric current, be used for inserting of welding current/push current and peak point current/background current analog signal; Cooperate the preposition adjusting of electric current, reached the overall process regulation and control to electric current.
Wherein, as shown in Figure 1, digital signal controller 4 is connected with ancillary equipment 8 by auxiliary circuit 5, auxiliary circuit 5 comprises the RS-232C interface 501 that connects by the synchronous serial port on the digital signal controller 4 (SPI1), ancillary equipment 8 comprises the computer 801 that is connected with RS-232C interface 501, can concentrate monitoring, on-line debugging, program download etc. by the integral body of computer 801 realization butt welding machines.
Wherein, as shown in Figure 2, auxiliary circuit 5 also comprise with digital signal controller 4 on crystal oscillator input port (OSC1) be connected OSC2 with the crystal oscillator output port) oscillating circuit 502 that is connected; The reset circuit 503 that is connected with the RESET input mouth (MCLR) on the digital signal controller 4, digital signal controller 4 has consisted of the minimum of computer system with oscillating circuit and reset circuit; (VREF+ is connected the reference voltage circuit 504 that is connected with VREF-with analog reference voltage input port on the digital signal controller 4; The PWM fault lockout circuit 505 that is connected with fault input port (FLTA) on the digital signal controller 4 for detection of the straight-through phenomenon that the complementary drive signal causes, can replace the intervention of software to realize protection to IGBT drive circuit 7, and is reliable and stable; And the warning circuit 506, hydraulic pressure testing circuit 506, electron gas valve controling circuit 508 and the high-frequency arc strike control circuit 809 that are connected with input/output port (I/O) on the digital signal controller 4 respectively.Wherein, warning circuit 506 is to prevent from variously by chance failure (overvoltage/under-voltage, overcurrent, overheated) source of welding current being damaged, be connected on the dsPIC30F4011 chip corresponding I/O mouth and low level occurs, turn-off chip PWM output waveform, thereby turn-off the main circuit system 1 of welding machine, and carry out the fault demonstration by display 303; Water route and the gas circuit of wherein utilizing 508 pairs of hydraulic pressure testing circuit 506 and electron gas valve controling circuits to be used for the cooling welding machine are controlled.
Wherein, can carry out inversion repeatedly in the main circuit system 1, thereby obtain more stable output characteristics, this preferred embodiment carries out illustrated as an example of an inversion example, as shown in Figure 1, main circuit system 1 also comprises the power supply 102, LC filter circuit 103, input rectification circuit 104, the filter circuit 105 that are connected to IGBT inverter circuit 101 inputs in turn, and the power transformer 106, output rectification circuit 107 and the lead-out terminal that are connected to IGBT inverter circuit 101 outputs in turn; Described lead-out terminal comprises negative output terminal 108 and the positive output terminal 109 that is connected on the output rectification circuit 107; Wherein, as shown in Figure 1, be provided with current sensor 110 between output rectification circuit 107 and the negative output terminal 108, be disposed with voltage sensor 111 and hf arc starter 112 between output rectification circuit 107 and the positive output terminal 109; Described current sensor 110 is connected with voltage sensor and is connected with signal conditioning circuit 6 respectively, and together composition is connected to the sample circuit 9 of simulating access port (AN) on the digital signal controller 4, sample circuit 9 is used for and will will be adjusted to suitable size and voltage signal is shown in real time from the closed-loop control by signal conditioning circuit 6 of the signal of telecommunication of current sensor 110 and voltage sensor 111, enter the analog channel port (AN) of digital signal controller 4, then carry out respectively the A/D conversion, thereby make digital signal controller 4 obtain the feedback of output characteristics, in this simultaneously in the real-time demonstration that realizes the signal of telecommunication.
Wherein, as depicted in figs. 1 and 2, hf arc starter 112 is connected with input/output port (I/O) on the digital signal controller 4, auxiliary by high-frequency arc strike control circuit 809, thus hf arc starter 112 is regulated control.
Embodiment of the present utility model is with reference to preferred structure illustrated in figures 1 and 2 in the accompanying drawing; the description of carrying out and explanation; be not to restriction of the present utility model, any modification and the conversion carried out in the scope of the utility model claim all belong to protection domain of the present utility model.
Claims (10)
1. digital control multi-functional inverter arc welding machine, comprise the main circuit system (1) that connects successively, numerical control system (2) and man-machine exchange system (3), main circuit system (1) comprises IGBT inverter circuit (101), it is characterized in that, described numerical control system (2) adopts digital signal controller (4) to do key control unit, also comprise the auxiliary circuit (5) that is connected with digital signal controller (4) respectively, for the treatment of the signal conditioning circuit (6) of the main circuit system that collects (1) data, and for the IGBT drive circuit (7) that IGBT inverter circuit (101) is driven control; The model of digital signal controller (4) is dsPIC30F4011, and it is connected with IGBT inverter circuit (101) by IGBT drive circuit (7), is used for main circuit system (1) is regulated control; Be provided with the PWM/PFM modulation module (701) for PWM and PFM combined modulation in the described IGBT drive circuit (7).
2. digital control multi-functional inverter arc welding machine as claimed in claim 1 is characterized in that, described IGBT drive circuit (7) is connected with pwm signal input port (PWM1L-PWM2H) on the digital signal controller (4) by its control signal input.
3. digital control multi-functional inverter arc welding machine as claimed in claim 1, it is characterized in that, described man-machine exchange system (3), comprise display driver circuit (301), be used for the parameter of main circuit system (1) is connected to the preset parameter regulating circuit (302) that digital signal controller (4) presets adjusting by display driver circuit (301); Be connected with on the display driver circuit (301) for the function selector circuit (304) of selecting welding manner with for the display (303) that shows main circuit system (1) information.
4. digital control multi-functional inverter arc welding machine as claimed in claim 3 is characterized in that, described display driver circuit (301) is connected with input/output port (I/O) on the digital signal controller (4).
5. digital control multi-functional inverter arc welding machine as claimed in claim 3, it is characterized in that, described man-machine exchange system (3) also comprises for the real-time regulating circuit of parameter (305) that the parameter of main circuit system (1) is undertaken by digital signal controller (4) directly regulate in real time; The real-time regulating circuit of parameter (305) is connected with analog channel port (AN) on the digital signal controller (4).
6. digital control multi-functional inverter arc welding machine as claimed in claim 1, it is characterized in that, described digital signal controller (4) is connected with ancillary equipment (8) by auxiliary circuit (5), auxiliary circuit (5) comprises the RS-232C interface (501) that connects by the synchronous serial port (SPI1) on the digital signal controller (4), and ancillary equipment (8) comprises the computer (801) that is connected with RS-232C interface (501).
7. digital control multi-functional inverter arc welding machine as claimed in claim 6, it is characterized in that, described auxiliary circuit (5), also comprise with digital signal controller (4) on crystal oscillator input port (OSC1) be connected OSC2 with the crystal oscillator output port) oscillating circuit (502) that is connected, the reset circuit (503) that is connected with the RESET input mouth (MCLR) on the digital signal controller (4), (VREF+ is connected the reference voltage circuit (504) that is connected with VREF-with analog reference voltage input port on the digital signal controller (4), the PWM fault lockout circuit (505) that is connected with fault input port (FLTA) on the digital signal controller (4), and the warning circuit (506) that is connected with input/output port (I/O) on the digital signal controller (4) respectively, hydraulic pressure testing circuit (507), electron gas valve controling circuit (508) and high-frequency arc strike control circuit (509).
8. such as claim 1 or 2 or 3 or 6 described digital control multi-functional inverter arc welding machines, it is characterized in that, described main circuit system (1), also comprise the power supply (102), LC filter circuit (103), input rectification circuit (104), the filter circuit (105) that are connected to IGBT inverter circuit (101) input in turn, and the power transformer (106), output rectification circuit (107) and the lead-out terminal that are connected to IGBT inverter circuit (101) output in turn; Described lead-out terminal comprises negative output terminal (108) and the positive output terminal (109) that is connected on the output rectification circuit (107).
9. digital control multi-functional inverter arc welding machine as claimed in claim 8, it is characterized in that, be provided with current sensor (110) between described output rectification circuit (107) and the negative output terminal (108), be disposed with voltage sensor (111) and hf arc starter (112) between output rectification circuit (107) and the positive output terminal (109); Described current sensor (110) is connected 111 with voltage sensor) be connected with signal conditioning circuit (6) respectively, and together form the sample circuit (9) that is connected to digital signal controller (4) upper simulation access port (AN).
10. digital control multi-functional inverter arc welding machine as claimed in claim 9 is characterized in that, described hf arc starter (112) is connected with input/output port (I/O) on the digital signal controller (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220630953 CN202910439U (en) | 2012-11-26 | 2012-11-26 | Digital control multifunction inverted arc welding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220630953 CN202910439U (en) | 2012-11-26 | 2012-11-26 | Digital control multifunction inverted arc welding machine |
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| CN 201220630953 Expired - Fee Related CN202910439U (en) | 2012-11-26 | 2012-11-26 | Digital control multifunction inverted arc welding machine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922091A (en) * | 2012-11-26 | 2013-02-13 | 甘肃西柴动力机电制造有限公司 | Digitally-controlled multifunctional inverted arc welding machine |
| CN103386535A (en) * | 2013-07-12 | 2013-11-13 | 深圳华意隆电气股份有限公司 | Digitized inverter welding machine |
| CN103737155A (en) * | 2014-01-06 | 2014-04-23 | 山东大学 | Single-phase full-bridge inversion topological magnetic biasing staged processing circuit and method |
| CN107414252A (en) * | 2017-09-21 | 2017-12-01 | 浙江雅创机电科技有限公司 | A kind of inversion manual welding machine |
-
2012
- 2012-11-26 CN CN 201220630953 patent/CN202910439U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102922091A (en) * | 2012-11-26 | 2013-02-13 | 甘肃西柴动力机电制造有限公司 | Digitally-controlled multifunctional inverted arc welding machine |
| CN103386535A (en) * | 2013-07-12 | 2013-11-13 | 深圳华意隆电气股份有限公司 | Digitized inverter welding machine |
| CN103386535B (en) * | 2013-07-12 | 2015-02-11 | 深圳华意隆电气股份有限公司 | Digitized inverter welding machine |
| CN103737155A (en) * | 2014-01-06 | 2014-04-23 | 山东大学 | Single-phase full-bridge inversion topological magnetic biasing staged processing circuit and method |
| CN103737155B (en) * | 2014-01-06 | 2015-04-29 | 山东大学 | Single-phase full-bridge inversion topological magnetic biasing staged processing circuit and method |
| CN107414252A (en) * | 2017-09-21 | 2017-12-01 | 浙江雅创机电科技有限公司 | A kind of inversion manual welding machine |
| CN107414252B (en) * | 2017-09-21 | 2019-10-29 | 浙江雅创机电科技有限公司 | A kind of inversion manual welding machine |
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Granted publication date: 20130501 Termination date: 20151126 |