CN103737154A - High-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding - Google Patents
High-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding Download PDFInfo
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- CN103737154A CN103737154A CN201410035648.2A CN201410035648A CN103737154A CN 103737154 A CN103737154 A CN 103737154A CN 201410035648 A CN201410035648 A CN 201410035648A CN 103737154 A CN103737154 A CN 103737154A
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- 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
- B23K9/00—Arc welding or cutting
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/092—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits characterised by the shape of the pulses produced
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
- B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
- B23K9/093—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits the frequency of the pulses produced being modulatable
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
- B23K9/1006—Power supply
- B23K9/1043—Power supply characterised by the electric circuit
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
The invention discloses a high-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding. The power unit comprises a rectifier and filter circuit, a peak current generating circuit and a background current detection circuit; the peak current generating circuit comprises a forward peak current generating circuit and a pulse peak current generating circuit, wherein a background current is inducted by the background current detection circuit, and the pulse peak current generating circuit is controlled by the processed background current, and meanwhile, the forward peak current generating circuit is controlled; and the onput current of the forward peak current generating circuit is served as an input current of the pulse peak current generating circuit, and the output current of the pulse peak current generating circuit is served as the output current of the power plant after the output current of the pulse peak current generating circuit and the background current are overlapped. In the power plant, a high-frequency square-wave peak current is output by the peak current generating circuit, the high-frequency square-wave peak current and the background current generated by any AC/DC (Alternating current/Direct current) arc welding power source in an overlapped way, and the overlapping of the high-frequency square-wave peak current and the background current can be controlled by the background current detection circuit.
Description
Technical field
The present invention relates to a kind of DC pulse coupling power device for arc welding, relate in particular to a kind of high frequency square wave DC pulse coupling power device for arc welding.
Background technology
In arc welder field, square wave direct current pulse current welding machine is used widely, as pulse MIC welding (being that welding connects), pulse TIG welding connect (being inert gas tungsten electrode protection welding) etc.Square wave direct current welding has outstanding feature compared with traditional welding, as controlled droplet transfer, appearance of weld, reduces pore etc., and the particularly stirring action of high-frequency pulse current to molten bath reduces the pore in weld seam, diminishes.Traditional DC pulse TIG, DC pulse MIG, its frequency is lower, generally at several hertz, arrives hundreds of hertz, and its basic principle realizes by current feedback signal and voltage given signal close loop negative feedback.But due to principle restriction, and the effect of line inductance, make this power supply not possess the ability that output is greater than the high-frequency pulse current of 20KHz, and its current-rising-rate, rate of descent, current amplitude and waveform poor controllability.Secondly, if high frequency square wave DC pulse is produced to power unit and background current generation power unit construction system, interlock is controlled, and control system complexity, and internal interference is like this serious, is not easy to control.
Summary of the invention
The high frequency square wave DC pulse coupling power device for arc welding that provides a kind of controllability strong in order to address the above problem is just provided object of the present invention.
The present invention is achieved through the following technical solutions above-mentioned purpose:
A kind of high frequency square wave DC pulse coupling power device for arc welding, comprise that current rectifying and wave filtering circuit and peak point current produce circuit, described peak point current produces circuit and comprises that preposition peak point current produces circuit and pulse peak current produces circuit, described preposition peak point current produces circuit and comprises the first power switch pipe～four power switch pipe, the first electric capacity, the second electric capacity, resonant capacitance, pulsactor, afterflow inductance, transformer, the first diode, the second diode, the first current sensor, closed loop pwm control circuit and just stage drive circuit, described pulse peak current produces circuit and comprises the 5th power switch pipe, the 6th power switch pipe, the 3rd triode, contactor, pulse-generating circuit and secondary drive circuit, described supply unit also comprises background current testing circuit, described background current testing circuit comprises alternating current-direct current Arc Welding Power, the second current sensor and background current treatment circuit, the cathode output end of described current rectifying and wave filtering circuit respectively with the colelctor electrode of described the first power switch pipe, the colelctor electrode of described the 3rd power switch pipe is connected with the first end of described the first electric capacity, the second end of described the first electric capacity respectively with the emitter stage of described the first power switch pipe, the colelctor electrode of described the second power switch pipe, the first end of described the second electric capacity is connected with the first end of described resonant capacitance, the emitter stage of described the 3rd power switch pipe is connected with the first end of described the 4th colelctor electrode of power switch pipe and the armature winding of described transformer respectively, the second end of the armature winding of described transformer is connected with the second end of described resonant capacitance with after described pulsactor series connection, the cathode output end of described current rectifying and wave filtering circuit respectively with the emitter stage of described the second power switch pipe, the second end of described the second electric capacity is connected with the emitter stage of described the 4th power switch pipe, the first end of the secondary windings of described transformer is connected with the positive pole of described the first diode, the negative pole of described the first diode is connected with the negative pole of described the second diode and the first end of described afterflow inductance respectively, the positive pole of described the second diode is connected with the second end of the secondary windings of described transformer, the stage casing of the secondary windings of described transformer is drawn tap and is connected with the emitter stage of described the 5th power switch pipe, described the first current sensor is set on the wire between tap and the emitter stage of described the 5th power switch pipe of the secondary windings stage casing of described transformer drawing, the second end of described afterflow inductance is connected with the colelctor electrode of described the 5th power switch pipe and the positive pole of described the 3rd diode respectively, the negative pole of described the 3rd diode is connected with the cathode output end of described alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, the first end of described the 6th colelctor electrode of power switch pipe and the normally opened contact of described contactor is connected, the second end of the normally opened contact of described contactor is connected with the cathode output end of described alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, described the second current sensor is set on the wire between the negative pole of described the 3rd diode and the cathode output end of described alternating current-direct current Arc Welding Power, the current output terminal of described the second current sensor is connected with the input of described background current treatment circuit, the current feedback output of described background current treatment circuit is connected with the feedback signal input of described pulse-generating circuit, the drive pulse signal output of described pulse-generating circuit is connected with the input of described secondary drive circuit, the control signal output of described pulse-generating circuit is connected with the control input end of described contactor, two signal output parts of described secondary drive circuit are connected with the base stage of described the 5th power switch pipe and the base stage of described the 6th power switch pipe respectively, the Voltage Feedback output of described background current treatment circuit is connected with the feedback voltage signal input of described closed loop pwm control circuit, the current output terminal of described the first current sensor is connected with the feedback current signal input part of described closed loop pwm control circuit, the drive pulse signal output of described closed loop pwm control circuit is connected with the described just input of stage drive circuit, four signal output parts of described just stage drive circuit respectively with the base stage of described the first power switch pipe, the base stage of described the second power switch pipe, the base stage of described the 3rd power switch pipe is connected with the base stage of described the 4th power switch pipe.
Further, described supply unit also comprises the first peak voltage absorbing circuit and the second peak voltage absorbing circuit, the two ends of described the first peak voltage absorbing circuit are connected with the collector and emitter of described the 5th power switch pipe respectively, and the two ends of described the second peak voltage absorbing circuit are connected with the collector and emitter of described the 6th power switch pipe respectively.Two peak voltage absorbing circuits are respectively used to absorb the due to voltage spikes between the 5th power switch pipe and colelctor electrode and the emitter stage of the 6th power switch pipe.
Beneficial effect of the present invention is:
In supply unit of the present invention, peak point current produces circuit output high frequency square wave peak point current, the background current stack output that can produce with any alternating current-direct current Arc Welding Power, background current testing circuit can spontaneous control high frequency square wave peak point current and the stack of background current; In addition, the current peak of this supply unit and frequency are independent adjustable, the pulse current that can independently to produce climbing, rate of descent >=50A/us, frequency >=20KHz, amplitude be 20～200A.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of high frequency square wave DC pulse coupling power device of the present invention;
Fig. 2 is the current waveform schematic diagram that peak point current of the present invention produces circuit output;
Fig. 3 is the waveform schematic diagram of the background current of alternating current-direct current Arc Welding Power output of the present invention;
Fig. 4 is and the waveform schematic diagram of the electric current of high frequency square wave DC pulse coupling power device of the present invention output.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, high frequency square wave DC pulse coupling power device for arc welding of the present invention comprises current rectifying and wave filtering circuit, peak point current produces circuit and background current testing circuit, the wave filter that described current rectifying and wave filtering circuit comprises rectifier bridge M and is comprised of resistance R and capacitor C, described peak point current produces circuit and comprises that preposition peak point current produces circuit and pulse peak current produces circuit, described preposition peak point current produces circuit and comprises the first power switch pipe T1, the second power switch pipe T2, the 3rd power switch pipe T3, the 4th power switch pipe T4, the first capacitor C 1, the second capacitor C 2, resonant capacitance Cg, pulsactor Lx, afterflow inductance L 1, transformer B, the first diode D1, the second diode D2, the first current sensor, closed loop pwm control circuit and just stage drive circuit, described pulse peak current produces circuit and comprises the 5th power switch pipe T5, the 6th power switch pipe T6, the 3rd diode D3, contactor K, pulse-generating circuit, secondary drive circuit, the first peak voltage absorbing circuit and the second peak voltage absorbing circuit, described background current testing circuit comprises alternating current-direct current Arc Welding Power, the second current sensor and background current treatment circuit, the cathode output end of described current rectifying and wave filtering circuit be capacitor C one end respectively with the colelctor electrode of the first power switch pipe T1, the colelctor electrode of the 3rd power switch pipe T3 is connected with the first end of the first capacitor C 1, the second end of the first capacitor C 2 respectively with the emitter stage of the first power switch pipe T1, the colelctor electrode of the second power switch pipe T2, the first end of the second capacitor C 2 is connected with the first end of resonance capacitor C g, the emitter stage of the 3rd power switch pipe T3 is connected with the first end of the colelctor electrode of the 4th power switch pipe T4 and the armature winding of transformer B respectively, the second end of the armature winding of transformer B is connected with the second end of resonant capacitance Cg with after pulsactor Lx series connection, the cathode output end of described current rectifying and wave filtering circuit be capacitor C the other end respectively with the emitter stage of the second power switch pipe T2, the second end of the second capacitor C 2 is connected with the emitter stage of the 4th power switch pipe T4, the first end of the secondary windings of transformer B is connected with the positive pole of the first diode D1, the negative pole of the first diode D1 is connected with the negative pole of the second diode D2 and the first end of afterflow inductance L 1 respectively, the positive pole of the second diode D2 is connected with the second end of the secondary windings of transformer B, the stage casing of the secondary windings of transformer B is drawn tap and is connected with the emitter stage of the 5th power switch pipe T5, the first current sensor is set on the wire between tap and the emitter stage of the 5th power switch pipe T5 of the secondary windings stage casing of transformer B drawing, the second end of afterflow inductance L 1 is connected with the colelctor electrode of the 5th power switch pipe T5 and the positive pole of the 3rd diode D3 respectively, the two ends of described the first peak voltage absorbing circuit are connected with the collector and emitter of described the 5th power switch pipe T5 respectively, the negative pole of the 3rd diode D3 is connected with the cathode output end of alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, the colelctor electrode of the 6th power switch pipe T6 is connected with the first end of the normally opened contact of contactor K, the two ends of the second peak voltage absorbing circuit are connected with the collector and emitter of the 6th power switch pipe T6 respectively, the second end of the normally opened contact of contactor K is connected with the cathode output end of alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, the second current sensor is set on the wire between the negative pole of the 3rd diode D3 and the cathode output end of alternating current-direct current Arc Welding Power, the current output terminal of the second current sensor is connected with the input of background current treatment circuit, the current feedback output of background current treatment circuit is connected with the feedback signal input of pulse-generating circuit, the drive pulse signal output of pulse-generating circuit is connected with the input of secondary drive circuit, the control signal output of pulse-generating circuit is connected with the control input end of contactor K, two signal output parts of secondary drive circuit are connected with the grid of the 5th power switch pipe T5 and the grid of the 6th power switch pipe T6 respectively, the Voltage Feedback output of background current treatment circuit is connected with the feedback voltage signal input of closed loop pwm control circuit, the current output terminal of the first current sensor is connected with the feedback current signal input part of closed loop pwm control circuit, the drive pulse signal output of closed loop pwm control circuit is connected with the input of first stage drive circuit, just four signal output parts of stage drive circuit respectively with the grid of the first power switch pipe T1, the grid of the second power switch pipe T2, the grid of the 3rd power switch pipe T3 is connected with the grid of the 4th power switch pipe T4.
As shown in Figure 1, during use, the U of rectification circuit M, V, W end are connected with three live wires of three-phase alternating-current supply respectively; The cathode output end of this supply unit is connected with positive electrode, positive electrode clamping welding rod, the cathode output end of this supply unit is connected with workpiece contact, when contacting with workpiece, connects welding rod circuit, the contact jaw of welding rod and workpiece produces high heat and makes welding rod termination and surface of the work fusing, reaches the object of welding.The control principle of this supply unit output current is: the second current sensor gathers the background current Ib of the cathode output end of alternating current-direct current Arc Welding Power by induction mode, and the current Ib f collecting is transferred to background current treatment circuit, the waveform of background current Ib as shown in Figure 3, background current treatment circuit is transferred to pulse-generating circuit by feedback current If, feedback voltage Ubf is transferred to closed loop pwm control circuit, pulse-generating circuit is according to feedback current If, pulse frequency f and the duty cycle, delta of outside input, produce opening and turn-offing of control signal control contactor K, when contactor K opens to secondary drive circuit output pulse signal (PWM2), this pulse signal acts on respectively the grid of the 5th power switch pipe T5 and the grid of the 6th power switch pipe T6 after secondary drive circuit, the first current sensor gathers the secondary current signal of transformer B and this feedback current Ipf is fed back to closed loop pwm control circuit, closed loop pwm control circuit compares the rear output pulse signal (PWM1) of judgement according to feedback current Ipf, feedback voltage Ubf and given normal voltage Uf, and this pulse signal is through just acting on respectively the grid of the first power switch pipe T1, grid, the grid of the 3rd power switch pipe T3 and the grid of the 4th power switch pipe T4 of the second power switch pipe T2 after stage drive circuit, the electric current I p of peak point current generation circuit output as shown in Figure 2, is high frequency square wave pulse direct current electric current, the electric current of the final output of this supply unit is that peak point current produces the recombination current after the electric current I p of circuit output and the current Ib stack of alternating current-direct current Arc Welding Power output, is high frequency square wave pulse direct current electric current.
Above-described embodiment is preferred embodiment of the present invention; it is not the restriction to technical solution of the present invention; as long as the technical scheme that can realize on the basis of above-described embodiment without creative work, all should be considered as falling within the scope of the rights protection of patent of the present invention.
Claims (2)
1. the high frequency square wave DC pulse coupling power device for arc welding, comprise that current rectifying and wave filtering circuit and peak point current produce circuit, it is characterized in that: described peak point current produces circuit and comprises that preposition peak point current produces circuit and pulse peak current produces circuit, described preposition peak point current produces circuit and comprises the first power switch pipe～four power switch pipe, the first electric capacity, the second electric capacity, resonant capacitance, pulsactor, afterflow inductance, transformer, the first diode, the second diode, the first current sensor, closed loop pwm control circuit and just stage drive circuit, described pulse peak current produces circuit and comprises the 5th power switch pipe, the 6th power switch pipe, the 3rd triode, contactor, pulse-generating circuit and secondary drive circuit, described supply unit also comprises background current testing circuit, described background current testing circuit comprises alternating current-direct current Arc Welding Power, the second current sensor and background current treatment circuit, the cathode output end of described current rectifying and wave filtering circuit respectively with the colelctor electrode of described the first power switch pipe, the colelctor electrode of described the 3rd power switch pipe is connected with the first end of described the first electric capacity, the second end of described the first electric capacity respectively with the emitter stage of described the first power switch pipe, the colelctor electrode of described the second power switch pipe, the first end of described the second electric capacity is connected with the first end of described resonant capacitance, the emitter stage of described the 3rd power switch pipe is connected with the first end of described the 4th colelctor electrode of power switch pipe and the armature winding of described transformer respectively, the second end of the armature winding of described transformer is connected with the second end of described resonant capacitance with after described pulsactor series connection, the cathode output end of described current rectifying and wave filtering circuit respectively with the emitter stage of described the second power switch pipe, the second end of described the second electric capacity is connected with the emitter stage of described the 4th power switch pipe, the first end of the secondary windings of described transformer is connected with the positive pole of described the first diode, the negative pole of described the first diode is connected with the negative pole of described the second diode and the first end of described afterflow inductance respectively, the positive pole of described the second diode is connected with the second end of the secondary windings of described transformer, the stage casing of the secondary windings of described transformer is drawn tap and is connected with the emitter stage of described the 5th power switch pipe, described the first current sensor is set on the wire between tap and the emitter stage of described the 5th power switch pipe of the secondary windings stage casing of described transformer drawing, the second end of described afterflow inductance is connected with the colelctor electrode of described the 5th power switch pipe and the positive pole of described the 3rd diode respectively, the negative pole of described the 3rd diode is connected with the cathode output end of described alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, the first end of described the 6th colelctor electrode of power switch pipe and the normally opened contact of described contactor is connected, the second end of the normally opened contact of described contactor is connected with the cathode output end of described alternating current-direct current Arc Welding Power and as the cathode output end of described supply unit, described the second current sensor is set on the wire between the negative pole of described the 3rd diode and the cathode output end of described alternating current-direct current Arc Welding Power, the current output terminal of described the second current sensor is connected with the input of described background current treatment circuit, the current feedback output of described background current treatment circuit is connected with the feedback signal input of described pulse-generating circuit, the drive pulse signal output of described pulse-generating circuit is connected with the input of described secondary drive circuit, the control signal output of described pulse-generating circuit is connected with the control input end of described contactor, two signal output parts of described secondary drive circuit are connected with the base stage of described the 5th power switch pipe and the base stage of described the 6th power switch pipe respectively, the Voltage Feedback output of described background current treatment circuit is connected with the feedback voltage signal input of described closed loop pwm control circuit, the current output terminal of described the first current sensor is connected with the feedback current signal input part of described closed loop pwm control circuit, the drive pulse signal output of described closed loop pwm control circuit is connected with the described just input of stage drive circuit, four signal output parts of described just stage drive circuit respectively with the base stage of described the first power switch pipe, the base stage of described the second power switch pipe, the base stage of described the 3rd power switch pipe is connected with the base stage of described the 4th power switch pipe.
2. the high frequency square wave DC pulse coupling power device for arc welding according to claim 1, it is characterized in that: described supply unit also comprises the first peak voltage absorbing circuit and the second peak voltage absorbing circuit, the two ends of described the first peak voltage absorbing circuit are connected with the collector and emitter of described the 5th power switch pipe respectively, and the two ends of described the second peak voltage absorbing circuit are connected with the collector and emitter of described the 6th power switch pipe respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410035648.2A CN103737154A (en) | 2014-01-24 | 2014-01-24 | High-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding |
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| CN201410035648.2A CN103737154A (en) | 2014-01-24 | 2014-01-24 | High-frequency square-wave DC (Direct Current) pulse coupling power unit used for electrical arc welding |
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Cited By (5)
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| CN108422065A (en) * | 2018-04-19 | 2018-08-21 | 华南理工大学 | Pulse MIG Welding Power Source system and its control method based on CAN fieldbus and LLC resonant converter |
| CN109581032A (en) * | 2018-12-17 | 2019-04-05 | 浙江大维高新技术股份有限公司 | A kind of high voltage pulse measurement circuit |
| CN110064817A (en) * | 2019-05-29 | 2019-07-30 | 华南理工大学 | Fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit |
| CN110190771A (en) * | 2019-06-21 | 2019-08-30 | 北京机械设备研究所 | A kind of high-frequency impulse circuit and peak voltage clamp absorption process |
| CN110729914A (en) * | 2019-11-04 | 2020-01-24 | 北京航空航天大学 | Closed-loop regulated high-precision superaudio pulse power supply |
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| CN110064817A (en) * | 2019-05-29 | 2019-07-30 | 华南理工大学 | Fast frequency pulse TIG welding connects power supply low-and high-frequency energy conversion and compound circuit |
| CN110190771A (en) * | 2019-06-21 | 2019-08-30 | 北京机械设备研究所 | A kind of high-frequency impulse circuit and peak voltage clamp absorption process |
| CN110729914A (en) * | 2019-11-04 | 2020-01-24 | 北京航空航天大学 | Closed-loop regulated high-precision superaudio pulse power supply |
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Application publication date: 20140423 |