CN101860072B - Multi-power parallel-combination welding power supply - Google Patents
Multi-power parallel-combination welding power supply Download PDFInfo
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- CN101860072B CN101860072B CN 201010149307 CN201010149307A CN101860072B CN 101860072 B CN101860072 B CN 101860072B CN 201010149307 CN201010149307 CN 201010149307 CN 201010149307 A CN201010149307 A CN 201010149307A CN 101860072 B CN101860072 B CN 101860072B
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Abstract
The invention discloses a multi-power parallel-combination welding power supply, aiming at providing a welding power supply which has simple structure principle, independently controls the current of parallel power supplies, keeps the total output current constant, allows each power supply to output non-equalizing current and is stable and reliable in work. The multi-power parallel-combination welding power supply comprises a parallel-combination welding power supply formed by at least two independent inverted power supplies; the welding power supply formed by parallel combination of at least two groups of power supplies is provided with a first current closed-loop control circuit (circuit B), in the first current closed-loop control circuit (circuit B), each parallel inverted power supply group is driven by the output end of a welding current control board, the output ends of all the parallel inverted power supply are connected in parallel and then output to a welding port through a current divider, and the first current closed-loop (circuit B) is used for making the total output current of the parallel power supply group be constant after superposition; and in addition, the parallel inverted power supply groups are respectively connected to a driver with current-limiting protection to form second power current closed-loop control circuits (circuits A) which are mutually independent. The invention solves the problems of power tube rupture accidents and power supply damage which are frequently caused by current unbalance in the prior art.
Description
Technical field
The present invention relates to a kind of power-supply device that uses in manual welding, gas shielded arc welding, submerged-arc welding, electroslag welding, plasma weldering and the plasma cutting that comprises.
Technical background
In the prior art, be used for automatically or the source of welding current of manual welding equipment, normally by the three-phase commutation bridge group, filter circuit, inverse switch circuit, control circuit, the single power supply that drive circuit secondary commutation circuit etc. form.The general source of welding current by the unitary class electric power generating composition, because the welding of welding surroundings, the especially main equipment of the larger welding current of can not satisfying the demand, and the requirement that does not reach required electric current.As Beijing epoch, Shandong Thailand difficult to understand, the good scholar in Shenzhen, Sweden Yi Sa company adopted as shown in Figure 3 only be the two-in-parallel power supply welding equipments of two these type of power supplys formations in parallel.This power-supply device is that a kind of each power supply that do not allow is exported unbalanced electric current, the power-supply device that cost of manufacture is higher, circuit debugging is difficult.
The source of welding current of this two-in-parallel system, owing in whole welding current scope, being difficult to accomplish fully balancedly output current, in welding process, when if a cover power-fail or damage are wherein arranged, welding system will be out of control immediately, cause current interruption or be stained with the phenomenons such as arc, bring serious problems of welded quality.Because the Current Control of parallel connection power supply is independent on the source of welding current shunt circuit of above-mentioned two-in-parallel system, can not prevent that primary and secondary electric current is excessive, and damages the high power contravariant device.Often the welding running in, the operation job insecurity of power supply.The reliability extreme difference of electric current output is difficult to avoid each power supply to export unbalanced electric current, therefore current unbalance occurs often, and startling stricken power supply pipe explosion accident occurs, and causes whole power supply to be scrapped.
China Patent No. is 96249841.6, publication number is that the CN2265867 patent discloses a kind of name and is called " super microcrystalline iron core single-end inverse DC welder " this electric welding machine and adopts minicrystal iron core to manufacture transformer, adopt a plurality of single-ended inverter circuits in parallel at transformer primary side, secondary adopts a plurality of change of current rectification circuits in parallel, and from the shunt output current signal to controller, compare with given current signal, adjust the pulse duration of triggering signal, form closed-loop control and guarantee constant current output.This patent adopts a plurality of single-ended inverter circuits unit parallel technology for obtaining needed high-power output, obtains high-power output and constant-current characteristics.To avoid causing damage components and parts phenomenon owing to misleading, guarantee the reliability of work.Thisly be equivalent to shown in Figure 3ly, only have the parallel connection power supply of a current closed-loop control loop, remain a kind of each power supply that do not allow and export unbalanced electric current, the power-supply device of circuit debugging difficulty.
Summary of the invention
Export unbalanced shortcoming in order to overcome prior art source of welding current electric current in parallel, task of the present invention is that a kind of structural principle of proposition is simple, the parallel connection power supply Current Control is independent, total constant output current is constant, and can allow each power supply to export unbalanced electric current, work very reliable and stable, debugging difficulty is little, many parallel welding power source systems that are particularly suitable for producing in enormous quantities.
Above-mentioned purpose of the present invention can reach by following measures, a kind of multi-power parallel-combination welding power supply, comprise, the parallel combination source of welding current that at least two platform independent inverters consist of, in at least by two groups of power parallel-combination welding power supplies, be provided with a circuit that drives each parellel inversion power group through welding current control board output, after the output parallel connection of each parellel inversion power group, behind shunt, export soldering opening to, make the output total current of the rear parallel connection power supply group of stack keep constant the first current closed-loop control loop (B loop); It is characterized in that, in each parellel inversion power group, each inverter all is connected with one separately with the separate second source current closed-loop control loop (A loop) of current-limiting protection driver formation, this second source current closed-loop control loop is that shunt is arranged on the total outlet line of parallel connection power supply group, directly enters the total current closed feedback loop of Current Control plate formation by the signal of current feedback line; In above-mentioned formation multi-power parallel-combination welding power supply system, optional normal power is as main power source, all the other are as accessory power supply, main power source has three control lines directly to link to each other with the welding current control board, in these three line traffic controls, have one to be the Voltage Feedback line that detects arc voltage, two is the reactance connecting line that detects welded condition in addition.
The present invention has following beneficial effect than prior art:
The present invention is at shunt of total output access of parellel inversion power, the first current closed-loop control loop system that makes it, and it can make the output total current after the stack of parallel connection power supply group keep constant, has guaranteed the total current stable output after the stack parallel connection.
The present invention configure a driving box with Current limited Control on the logical inverter of every Daepori, thus the second current closed-loop control loop of the normal power that is comprised of inverter and current-limiting protection circuit of formation.The reliability and stability of normal power have been improved greatly.This current closed-loop loop is played in whole normal power and is prevented that primary and secondary electric current is excessive, and damages the effect (being Current limited Control) of high power contravariant device, thereby has protected the reliability of inversion welding system work.Therefore work as them and be parallel to a time-out, driver protection inverter separately separately simultaneously also allows each normal power, has allowed unbalanced electric current output.Make this normal power can carry out numerous parallel combination and become possibility.Large electric current behind the parallel combination after the primary current closed-loop control, can obtain constant High-current output.Further avoided prior art that current unbalance occurs often, the defective of power supply booster has occured.
The current-limiting protection circuit that the present invention will have a current-limiting protection function is combined with the inversion driver, and each driver is configured to separately in each inverter, forms the separate current control of power supply, has guaranteed the reliability service of each normal power.Because the current-limiting protection that each normal power is provided with.Can allow each normal power group to export unbalanced electric current, but when the total output current of welding, it is invariable that the electric current of output keeps, and then guaranteed that the stable, reliable of whole welding power source system moves, for improving welding quality, the scope of application of expanding the source of welding current provides development space, many parallel welding power source systems that are particularly suitable for producing in enormous quantities.
Because the present invention allows each normal power to export unbalanced current value, the total output of welding current constant constant, therefore, greatly reduce the difficulty of debugging, stack in parallel is become is more prone to.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of multi-power parallel-combination welding power supply of the present invention.
Fig. 2 is the drive circuit schematic diagram of band Current limited Control of the present invention.
Fig. 3 is now widely used two-in-parallel circuit diagram.
Embodiment
Consult Fig. 1 and Fig. 2.Normal power is made of an inverter and the driver with Current limited Control.Many the combination in parallel sources of welding current of the present invention are to drive the parallel combination welding power source system that box and independent inverter consist of by two with Current limited Control at least.In at least by two groups of power parallel-combination welding power supply systems, be provided with a circuit that drives each parellel inversion power group through welding current control board output, after the output parallel connection of each parellel inversion power group, behind shunt, export soldering opening to, make the output total current of the rear parallel connection power supply group of stack keep the first constant current closed-loop control loop, i.e. B loop; And in each parellel inversion power group, each inverter all is connected with one separately with the driver of current-limiting protection, and the separate second source current closed-loop control loop that consists of, i.e. A loop.In other words, this second source current closed-loop control loop is that shunt is arranged on the total outlet line of parallel connection power supply group, directly enters the total current closed feedback loop of Current Control plate formation by the signal of current feedback line.
Above-mentioned second source current closed-loop control loop A usually can be contained in Current limited Control and drive in the box.Being connected in parallel on the parallel connection power supply group in the first current closed-loop control B loop, can be to be comprised of two these inverters of stylobate at least, contains an independently closed control circuit in each normal power, in order to guarantee the reliability of normal power.In the combinations thereof welding power source system, can choose a normal power wantonly as main power source, remaining then is accessory power supply.Be main power source such as the normal power that is connected in parallel in the circuit by first group, all the other normal powers that are parallel in the circuit are accessory power supply.The quantity of normal power in the parallel power supply system is determined by the size of required total output current.As be the welding system that is composed in parallel by eight normal powers in Fig. 1, wherein first normal power is main power source, and all the other seven normal powers are accessory power supply.Welding current can be 1000A, and the electric current of each normal power output can be 125A, and at this moment, the size of each normal power output current only is 62.5% of rated value.The current-limiting protection ability can be set in 80% of rated value, i.e. 160A.
In Fig. 1, normal power has three control lines directly to link to each other with the welding current control board, in these three line traffic controls, has one to be the Voltage Feedback line that detects arc voltage, and two is the reactance connecting line that detects welded condition in addition.The Voltage Feedback line is connected to the output of the rectifier diode of described main power source, the other end is connected on the voltage detecting circuit of welding current control board, other two reactor output line one ends are connected on the out put reactor of main power source, and the other end is connected on the current detection circuit of welding current control board.
Consult Fig. 2.The current-limiting protection circuit that is connected on the inverter comprises; by being connected in parallel on TR2 level of instrument transformer terminals (E1; E2) on; contact resistance R14; the bridge-type filter rectifier that C10 parallel filtering loop forms; and be connected in three integrated circuit (IC) 1B in parallel; IC1C; the IC1D input; pass through the continuous parallel resistance R10 of diode D16 parallel resistance R15 contact through filtering capacitor C12; R11; resistance R 10 series voltage stabilizing diode D15; voltage stabilizing didoe D15 is connected in resistance R 14 shunt capacitance C10 by two brachium pontis one tip nodes of bridge-type filter rectifier; form the bridge-type filter rectifier by two brachium pontis other end capacitor C 10 and resistance R 14 parallel filtering loops; the resistance R 15 pulse threshold circuit that capacitor C 12 forms that links to each other with diode D16 shunt circuit common port; also comprise master board input pulse signal, add to integrated circuit (IC) 1A by resistance R 16 and after anti-phase, output to the divider resistance R13 that is connected on the above-mentioned pulse threshold circuit output.
The inversion driver that links to each other with the pulse threshold circuit, comprise, the inversion driver that links to each other with the pulse threshold circuit, comprise, pulse signal is delivered to field effect transistor T10 grid, the bleeder circuit that is comprised of resistance R 13 and R12 and two are connected on the effect pipe T10 circuit of output terminal, the shaping circuit that is formed by voltage stabilizing didoe D18 and D17, and promote high power contravariant power tube T1 and T2 on two brachium pontis through pulse transformer TR3.The 380V three-phase alternating-current supply, through secondary commutation current circuit and secondary transformation TR1, instrument transformer TR2, through D11-D14 bridge-type filter rectifier, behind the rectifying and wave-filtering, become direct voltage+560V B, be added on the diode D1 and high power contravariant pipe T1 on the secondary transformer loop, 0VB voltage is added on diode D2 and the high power contravariant pipe T2.Wherein, consist of half pushing-type inverter circuit by diode D1 and D2 and high power contravariant pipe T1 and T2, when high power contravariant pipe T1 and T2 conducting, primary current is at first by the 560VB direct voltage, behind high power contravariant pipe T1, arrive again the elementary of the elementary of instrument transformer TR2 and welding transformer TR1, turn back to 0VB by high power contravariant pipe T2 at last.
When inverter turn-offed, the energy that welding transformer TR1 stores was deposited in the DC power supply of getting back to 560VB again by diode D1 and D2, and welding current is secondary by welding transformer TR1, again through exporting behind the secondary commutation circuit.
Pulse signal on resistance R 16, is input to the input of integrated circuit (IC) 1A by pulse input end again.When the primary current of welding transformer during less than cut-off current, the port of the integrated circuit (IC) 1B of three parallel connections, IC1C, IC1D is low level, at this moment, three integrated circuits allow the pulse signal of IC1A to pass through, and anti-phasely once output to afterwards on the resistance R 13, after resistance R 13 and R12 dividing potential drop, pulse signal is delivered to the grid of field effect transistor T10, after T10 amplifies, again through the isolation of pulse transformer TR3, reach two independently shaping circuits (shaping circuit 1 and shaping circuit 2), remove to drive high power contravariant power tube T1 and T2.
When the welding transformer primary current increases, the secondary current of instrument transformer TR2 also strengthens thereupon, and secondary current enters the rectifier bridge that is made of fast diode D11 to D14 by terminals E1 and E2, after filtering capacitor C10 filtering, add to voltage stabilizing didoe D15.
When primary current does not reach the cut-off current value, not conducting of voltage stabilizing didoe D15.So capacitor C12 does not have voltage, integrated circuit (IC) 1B is to IC1D, normal output pulse signal.
When the primary current of welding transformer meets or exceeds the cut-off current value, voltage on the capacitor C10 exceeds the conducting voltage of voltage stabilizing didoe D15, voltage stabilizing didoe D15 conducting, voltage add to another input of capacitor C12 and IC1B to IC1D by resistance R 10.At this moment, the input of the integrated circuit (IC) 1B to IC1D of three parallel connections is high level, has sealed the output of IC1B and IC1D, so cut off the pulse input, has reached the purpose of current limliting.
When welding transformer primary current during less than cut-off current, diode D15 open circuit, the voltage on the capacitor C10 is low level.Integrated circuit (IC) 1B to IC1D recovers output of pulse signal again.Welding transformer returns to operating state again.
Claims (6)
1. multi-power parallel-combination welding power supply, comprise, the parallel combination source of welding current that at least two platform independent inverters consist of, in at least by two groups of power parallel-combination welding power supplies, be provided with a circuit that drives each parellel inversion power group through welding current control board output, after the output parallel connection of each parellel inversion power group, behind shunt, export soldering opening to, make the output total current of the rear parallel connection power supply group of stack keep constant the first current closed-loop control loop (B loop); In each parellel inversion power group, each inverter all is connected with one separately with the separate second current closed-loop control loop (A loop) of current-limiting protection driver formation; In above-mentioned formation multi-power parallel-combination welding power supply system; optional normal power is as main power source; all the other are as accessory power supply; main power source has three control lines directly to link to each other with the welding current control board; in these three line traffic controls; there is one to be the Voltage Feedback line that detects arc voltage; two is the reactance connecting line that detects welded condition in addition; it is characterized in that; be connected with current-limiting protection circuit at inverter; described current-limiting protection circuit; comprise; by being connected in parallel on TR2 level of instrument transformer terminals (E1; E2) on; contact resistance R14; the bridge-type filter rectifier that C10 parallel filtering loop forms; and be connected in three integrated circuit (IC) 1B in parallel; IC1C; the IC1D input; pass through the continuous resistance R 11 of diode D16 parallel resistance R15 contact through filtering capacitor C12; R10; resistance R 10 series voltage stabilizing diode D15; voltage stabilizing didoe D15 is connected in resistance R 14 shunt capacitance C10 by two brachium pontis one tip nodes of bridge-type filter rectifier; form the bridge-type filter rectifier by two brachium pontis other end capacitor C 10 and resistance R 14 parallel filtering loops; the resistance R 15 pulse threshold circuit that capacitor C 12 forms that links to each other with diode D16 shunt circuit common port; also comprise master board input pulse signal, add to integrated circuit (IC) 1A by resistance R 16 and after anti-phase, output to the divider resistance R13 that is connected on the above-mentioned pulse threshold circuit output.
2. multi-power parallel-combination welding power supply according to claim 1 is characterized in that, contains an independently closed control circuit in each normal power.
3. multi-power parallel-combination welding power supply according to claim 1, it is characterized in that, the Voltage Feedback line is connected to the output of the rectifier diode of described main power source, the other end is connected on the voltage detecting circuit of welding current control board, other two reactance connecting line one ends are connected on the out put reactor of main power source, and the other end is connected on the current detection circuit of welding current control board.
4. multi-power parallel-combination welding power supply according to claim 1 is characterized in that, shunt is arranged on the total outlet line of parallel connection power supply group, and the signal by the current feedback line directly enters the Current Control plate and consists of the total current closed feedback loop.
5. multi-power parallel-combination welding power supply according to claim 1, it is characterized in that, when the primary current of welding transformer TR1 during less than cut-off current, the integrated circuit (IC) 1B of three parallel connections, IC1C, the port of IC1D is low level, and three integrated circuits allow the pulse signal of IC1A to pass through, and anti-phasely once output to afterwards on the resistance R 13, after resistance R 13 and R12 dividing potential drop, pulse signal is delivered to the grid of field effect transistor T10, after T10 amplifies, again through the isolation of pulse transformer TR3, reach two independently behind the shaping circuit (shaping circuit 1 and shaping circuit 2), go again to drive and lay respectively at two high power contravariant power tube T1 and T2 on the brachium pontis.
6. multi-power parallel-combination welding power supply according to claim 1, it is characterized in that, the inversion driver that links to each other with the pulse threshold circuit, comprise, pulse signal is delivered to field effect transistor T10 grid, the bleeder circuit that is comprised of resistance R 13 and R12 and two are connected on the field effect transistor T10 circuit of output terminal, the shaping circuit that is formed by voltage stabilizing didoe D18 and D17, and promote power inverting power tube T1 and T2 on two brachium pontis through pulse transformer TR3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010149307 CN101860072B (en) | 2010-04-19 | 2010-04-19 | Multi-power parallel-combination welding power supply |
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| CN 201010149307 CN101860072B (en) | 2010-04-19 | 2010-04-19 | Multi-power parallel-combination welding power supply |
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| CN101860072A CN101860072A (en) | 2010-10-13 |
| CN101860072B true CN101860072B (en) | 2013-01-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6154681B2 (en) * | 2013-07-02 | 2017-06-28 | 株式会社ダイヘン | Output control method of welding power source |
| CN109361309B (en) * | 2018-10-31 | 2021-08-27 | 苏州汇川技术有限公司 | Parallel inverter system and wave-by-wave current limiting control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141833A (en) * | 1995-07-28 | 1997-02-05 | 北京汇佳物产技术公司 | Full-automatic arc light soldering machine |
| CN2265867Y (en) * | 1996-12-30 | 1997-10-29 | 江西大有科技有限公司 | Super microcrystalline iron core single-end inverse DC welder |
| CN2483135Y (en) * | 2001-07-11 | 2002-03-27 | 刘振英 | Large power inverter for welding use |
| TW200620778A (en) * | 2004-08-30 | 2006-06-16 | Monolithic Power Systems Inc | Short circuit current ratcheting in switch mode DC/DC voltage regulators |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4468316B2 (en) * | 2006-02-15 | 2010-05-26 | 株式会社日立製作所 | Overcurrent detection circuit and overcurrent detection method for power supply device |
-
2010
- 2010-04-19 CN CN 201010149307 patent/CN101860072B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141833A (en) * | 1995-07-28 | 1997-02-05 | 北京汇佳物产技术公司 | Full-automatic arc light soldering machine |
| CN2265867Y (en) * | 1996-12-30 | 1997-10-29 | 江西大有科技有限公司 | Super microcrystalline iron core single-end inverse DC welder |
| CN2483135Y (en) * | 2001-07-11 | 2002-03-27 | 刘振英 | Large power inverter for welding use |
| TW200620778A (en) * | 2004-08-30 | 2006-06-16 | Monolithic Power Systems Inc | Short circuit current ratcheting in switch mode DC/DC voltage regulators |
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