CN100493802C - Power supply control system for inversion arc welding - Google Patents
Power supply control system for inversion arc welding Download PDFInfo
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- CN100493802C CN100493802C CNB2007101196207A CN200710119620A CN100493802C CN 100493802 C CN100493802 C CN 100493802C CN B2007101196207 A CNB2007101196207 A CN B2007101196207A CN 200710119620 A CN200710119620 A CN 200710119620A CN 100493802 C CN100493802 C CN 100493802C
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Abstract
The invention relates to an invert arc welding power supply control system. The secondary side voltage (A5) of transformer connects to the input end of operational amplifier (C1). The output of operational amplifier is the input of comparator (C2). The given signal is connected to the input reference voltage end of comparator. The output of comparator connects to controller (C3), and every cycle, it sets and resets the controller. The controller uses NOT gate and AND gate connected to photo-electricity coupling to realize cut over and cut off Mosfet tube (C8) to achieve charging capacitance in single cycle. The controller takes switch mode control to DC-AC invert circuit (A3) through PWM chip driving circuit (D). The invention realizes compensate to voltage disturbance in a cycle to ensure more accurate welding control.
Description
Technical field
The present invention relates to a kind of control system for inversion arc welding source, belong to welding equipment and automatic field.
Background technology
At present, the control thought of using in the field of welding inverter power source mainly contains monocycle control mode (as shown in Figure 1) and dicyclo control mode (as shown in Figure 2) by the control mode branch; By the feedback kind branch, mainly contain voltage type PWM and current mode PWM control.Monocycle control mode and dicyclo control mode all belong to voltage type PWM, it can to since the error that load generation disturbance or electrical network generation disturbance occur mediate.In the voltage-type FEEDBACK CONTROL, voltage error signal is by the linear duty cycle signals that is modulated into; When input voltage or load variations, output voltage, voltage error signal, dutycycle all change, and after dynamic adjustments, output voltage returns to stationary value.The time that this dynamic adjustments continues is determined by loop gain bandwidth, is generally a plurality of switch periods times, so no matter voltage type PWM control adopts the control of monocycle or dicyclo, all can't make compensation to disturbance immediately.The current mode FEEDBACK CONTROL then is to have utilized the pulse and the non-linear characteristics of converter, and its dutycycle is determined by the relational expression that has comprised some nonlinear state feedbacks; When input voltage increased, the electric current slope increased immediately, and dutycycle reduces.This dynamic adjustments has good capability of fast response, but there is static error in system, and precision can't meet the demands.If adopt other compensation way, then speed can be affected again.
The monocycle control technology is that nonlinear switching is become linear switch, is a kind of nonlinear Control technology.Disturbance for input voltage (line voltage), the monocycle control technology can be controlled output signal instantaneously in a switch periods, its dynamic property will be more superior than voltage-type, current-mode control technology, so it has significant application value in the demanding power conversion of dynamic property occasion.If the monocycle control technology is applied to can give full play to the advantage of monocycle control technology in the source of welding current control system.
The patent of invention content
The present invention is applied to the monocycle control technology in the source of welding current field, and at the characteristics of welding process, arcing, each stage of opening circuit in the welding process are carried out Waveform Control respectively, a kind of brand-new source of welding current control mode has been proposed, can in very short time, the disturbance to line voltage adjust, main circuit adopts two-tube single-end ortho-exciting topological structure, in each cycle transformer is carried out magnetic-reset, guarantees that transformer the magnetic saturation phenomenon can not occur; Simultaneously, arcing and short-circuit condition are controlled respectively, reached better welding effect.
To achieve these goals, the present invention has taked following technical scheme.Native system mainly includes the main circuit part A, reference signal is given certain portions B, drive circuit D.The main circuit part A mainly includes rectification A1, filtering A2, DC-AC inverter circuit A3, transformer A4, secondary rectification A6, secondary inductance A7.Reference signal mainly includes voltage sample B1, status determination circuit B2 for certain portions B, switch is selected B3, voltage sample B1 passes to status determination circuit B2 with signal, judge it is short circuit or arcing this moment, according to different conditions, set analog switch B3 provides the reference voltage waveform of arcing or short circuit.Drive circuit D is connected with DC-AC inverter circuit A3; It is characterized in that: monocycle control section C mainly includes operational amplifier C1, comparator C 2, controller C3, PWM pulse width modulator C4, not gate C5, manages C8, charge and discharge capacitance C9 with door C6, light-coupled isolation C7, Mosfet.Wherein, operational amplifier C1 and charge and discharge capacitance C9 form integrating circuit, and C8 is in parallel with charge and discharge capacitance C9 for the Mosfet pipe; The secondary sampled voltage A5 of transformer A4 sends into operational amplifier C1 input, and the output of operational amplifier C1 is connected with the in-phase input end of comparator C 2, the reference voltage the when inverting input of comparator C 2 connects arcing or short-circuit condition by switch B3.The output of comparator C 2 links to each other with the reset terminal of controller C3, the set termination PWM pulse width modulator C4 crystal oscillator output signal of controller C3, PWM pulse width modulator C4 triggered controller C3 in each cycle, controller C3 passes through not gate C5, manages C8 with door C6 and light-coupled isolation C7 control Mosfet, make charge and discharge capacitance C9 charge and discharge in the single cycle, thereby DC-AC inverter circuit A3 is opened, turn-offs control by drive circuit D; By judging conditions at the arc, arcing and two stages of short circuit are controlled respectively.
The operation principle of patent of the present invention and process:
Secondary sampled voltage signal sends amplifier C1 to by A5, and the output cycle of establishing PWM is fs, and operational amplifier end of oppisite phase input signal is x (t), and the output voltage that can get C1 is:
V
ref＝(1/C9)∫
0 Tonx(t)d
t
When operational amplifier C1 output voltage values equals reference voltage, comparator C 2 output high level, reset controller C3 is because resetting of C3 so turn-off the PWM output signal immediately, turn-offed DC-AC inverter circuit A3 thereby pass through drive circuit D; Simultaneously, owing to resetting of C3, so by isolating light idol C7 conducting Mosfet pipe C8 immediately, capacitor C 9 begins repid discharges this moment; The synchronous crystal oscillator output signal of set termination PWM of controller C3, Dead Time set that time controller in each cycle of arrival, when next cycle arrives constantly, PWM pulse width modulator output pin is a high level, simultaneously, turn-off Mosfet pipe C8 rapidly by isolating light idol C7, for the PWM output of next cycle and the integral operation of amplifier are prepared.
Make the value of C9 equal the output cycle of PWM: (1/C9)=fs, then the output valve of operational amplifier is: V
Ref=fs* ∫
0 TonX (t) d
t
This has just realized the monocycle control technology is applied in the welding inverter power source field, characteristics at monocycle control, main circuit is taked two-tube single-end ortho-exciting topological structure, in the monocycle, realize the magnetic-reset of transformer, thereby keep the volt of positive and negative two pulsewidths of transformer. the amperage balance guarantees that transformer the magnetic saturation phenomenon can not occur.
Compared with prior art, patent of the present invention has the following advantages:
1. the monocycle control technology is applied to source of welding current field, its dynamic property will be more superior than voltage-type, current mode instantaneous value control technology.
2. can in one-period, make compensation to the disturbance of electrical network.
3. at the characteristics of welding process, the arcing and the waveform in two stages of short circuit are controlled respectively.
Description of drawings
Fig. 1 is the monocycle control mode
Fig. 2 is the dicyclo control mode
Fig. 3 is the welding inverter power source based on the monocycle control mode
Fig. 4 is the concrete application circuit of monocycle mode
Fig. 5 is for judging the control waveform circuit diagram that provides short circuit, arcing process by state.
The specific embodiment
Describe present embodiment in detail in conjunction with Fig. 3～Fig. 5.
The input voltage of main circuit A is the three-phase alternating current of 380V, through the AC-DC-AC conversion, changes into the power supply that the power supply welding machine uses.Fig. 4 is the application of monocycle control mode, the secondary sampled signal of transformer inputs to 2 pin of operational amplifier CA3140, carry out integral operation, when the 6 pin output valves of operational amplifier CA3140 equal reference value, the 2 pin output high level of comparator LM319, the output signal of comparator connects the R end of controller CD4013, at this moment, controller discharges to capacitor C 9 by not gate C5, with door C6 with isolate light idol C7 and make MOSFET pipe C8 open-minded.The Q end of controller CD4013 links to each other with 2 pin of PWM3525, when the R of controller CD4013 end is high level, the Q end then is a low level, at this moment, the PWM3525 output pin is a low level, turn-offs IGBT, so, when comparator LM311 output high level, realized shutoff DC-AC inverter circuit A3 and capacitor C 9 has been discharged.The 4 pin crystal oscillator outputs of PWM3525 link to each other with the S end of controller CD4013 by comparator, when controller S end is high level, then controller CD3140Q end is high level, when next cycle arrives constantly, the PWM3525 output pin is a high level, opens IGBT, simultaneously, Mosfet pipe C8 is turn-offed, for the integration of next cycle is got ready.
Circuit diagram 5 is according to judgement, produce the circuit diagram of arcing and short circuit two-way control waveform, the voltage signal that LEM gathers is given the end of oppisite phase of comparator LM393A, given signal of the positive termination of comparator LM393A, judge still to be that arc stage (should be bigger according to short-circuit stage voltage for short circuit this moment, arc stage voltage should be less principle), when entering arc stage, comparator LM393A output low level, triode S8050 turn-offs, the in-phase end input signal of operational amplifier LM324B can be given by adjustable resistance R2, passes through emitter follower LM324B again, integrating circuit LM324D passes to the end of oppisite phase of CA3140, meanwhile, effect by phase inverter 40106, the short_con point is a low level, and the SCA point is a low level, and the SCB point is a high level, utilize two-way choice switch H4053, give CA3140 end of oppisite phase input particular value, add the UG of original setting, thereby make the reference waveform of the arc stage that the output of CA3140 obtains wanting; When entering short-circuit stage, comparator LM393A output is a high level, open triode S8050, the in-phase end input signal of operational amplifier LM324B is+15V, pass through emitter follower LM324B again, integrating circuit LM324D passes to the end of oppisite phase of CA3140, meanwhile, effect by phase inverter 40106, the short_con point is a high level, and the SCA point is a high level, and the SCB point is a low level, utilize two-way choice switch H4053, give CA3140 end of oppisite phase input particular value, add the UG of original setting, thereby make the reference waveform of the short-circuit stage that the output of CA3140 obtains wanting.
Claims (1)
1, a kind of control system for inversion arc welding source, mainly include main circuit part (A), reference signal to certain portions (B), drive circuit (D), main circuit part (A) mainly includes rectification (A1), filtering (A2), DC-AC inverter circuit (A3), transformer (A4), secondary rectification (A6), the secondary inductance (A7) that connects successively; Reference signal mainly includes voltage sample (B1), status determination circuit (B2), analog switch (B3) for certain portions (B), voltage sample (B1) is passed to status determination circuit (B2) with signal, and it is short circuit or arcing that status determination circuit (B2) is judged this moment; DC-AC inverter circuit (A3) in drive circuit (D) and the main circuit part (A) is connected; It is characterized in that: according to different conditions, analog switch (B3) provides the reference voltage waveform of arcing or short-circuit condition; Also include monocycle control section (C), monocycle control section (C) mainly includes operational amplifier (C1), comparator (C2), controller (C3), PWM pulse width modulator (C4), not gate (C5), manages (C8), charge and discharge capacitance (C9) with door (C6), light-coupled isolation (C7), Mosfet; Wherein, operational amplifier (C1) is formed integrating circuit with charge and discharge capacitance (C9), and Mosfet pipe (C8) is in parallel with charge and discharge capacitance (C9); The secondary sampled voltage (A5) of transformer (A4) is sent into operational amplifier (C1) input, the output of operational amplifier (C1) is connected with the in-phase input end of comparator (C2), the reference voltage the when inverting input of comparator (C2) connects arcing or short-circuit condition by analog switch (B3); The output of comparator (C2) links to each other with the reset terminal of controller (C3), set termination PWM pulse width modulator (C4) the crystal oscillator output signal of controller (C3), PWM pulse width modulator (C4) triggered controller (C3) in each cycle, controller (C3) passes through not gate (C5), manages (C8) with door (C6) and light-coupled isolation (C7) control Mosfet, makes charge and discharge capacitance (C9) charge and discharge in the single cycle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101196207A CN100493802C (en) | 2007-07-27 | 2007-07-27 | Power supply control system for inversion arc welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101196207A CN100493802C (en) | 2007-07-27 | 2007-07-27 | Power supply control system for inversion arc welding |
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| CN101092002A CN101092002A (en) | 2007-12-26 |
| CN100493802C true CN100493802C (en) | 2009-06-03 |
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| CNB2007101196207A Expired - Fee Related CN100493802C (en) | 2007-07-27 | 2007-07-27 | Power supply control system for inversion arc welding |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101412140B (en) * | 2008-11-17 | 2011-06-01 | 江苏科技大学 | Zero-voltage soft switch topological main circuit of arc welding inverter |
| CN101966618B (en) * | 2010-11-12 | 2012-07-04 | 深圳华意隆电气股份有限公司 | Reactor-free and shunt-free current type PWM inverter type welding cut power supply |
| CN102091848B (en) * | 2010-12-21 | 2013-07-31 | 无锡市大德科技有限公司 | Inverter CO2/MAG/MIG welding machine arc control circuit |
| CN102208866B (en) * | 2011-07-01 | 2013-05-08 | 无锡市南方电器制造有限公司 | Intermediate frequency inversion DC and variable frequency AC resistance welding power supply |
| CN102624246B (en) * | 2012-03-23 | 2014-12-10 | 浙江大学宁波理工学院 | Single-ended forward parallel push-pull type high-power converter |
| CN103973106A (en) * | 2013-01-30 | 2014-08-06 | 仁宝电脑工业股份有限公司 | Power supply system with pulse signal generator |
| JP5679241B1 (en) * | 2013-09-27 | 2015-03-04 | 株式会社京三製作所 | Voltage source DC power supply and control method for voltage source DC power supply |
| CN103692059B (en) * | 2014-01-17 | 2015-09-16 | 李阳 | Arc Welding Power |
| CN103990891B (en) * | 2014-04-18 | 2017-04-19 | 深圳市瑞凌实业股份有限公司 | Current control circuit of inverse arc welding power source and inverse arc welding power source |
| CN106505661A (en) * | 2016-10-25 | 2017-03-15 | 合肥工业大学 | A kind of battery equalization system |
| CN106513935A (en) * | 2016-12-30 | 2017-03-22 | 唐山松下产业机器有限公司 | Arcing state judgment method and device and electric arc welding device |
| US11271480B2 (en) * | 2020-08-03 | 2022-03-08 | xMEMS Labs, Inc. | Driving circuit with energy recycle capability and method thereof |
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| CN101092002A (en) | 2007-12-26 |
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Assignee: Wuxi Zhouxiang Complete Set of Welding Equipment Co., Ltd. Assignor: Beijing University of Technology Contract record no.: 2010320000461 Denomination of invention: Control system for inversion arc welding source Granted publication date: 20090603 License type: Exclusive License Open date: 20071226 Record date: 20100426 |
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