CN103934562B - The micro-connection special power-supply system of a kind of filament - Google Patents
The micro-connection special power-supply system of a kind of filament Download PDFInfo
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- CN103934562B CN103934562B CN201410165133.4A CN201410165133A CN103934562B CN 103934562 B CN103934562 B CN 103934562B CN 201410165133 A CN201410165133 A CN 201410165133A CN 103934562 B CN103934562 B CN 103934562B
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/241—Electric supplies
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- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides the micro-connection special power-supply system of a kind of filament, comprise contravariant high power switching power supply and current waveform output circuit that output voltage is adjustable; Current waveform output circuit comprises single-chip microcomputer and plural constant current circuit; Each constant current circuit is connected with contravariant high power switching power supply, single-chip microcomputer respectively. Does is the present invention based on ATmega8? the micro-connection power supply of monolithic processor controlled Novel electric thermal resistance filament, micro-connection electric current that it can export random waveform within the scope of the certain hour requiring, can meet thin especially silk completely and connect; The present invention also can be used for the other fields such as minisize component manufacture, has started new method for realizing the precision welding of metal micro parts.
Description
Technical field
The invention belongs to filament welding technology field, particularly the micro-connection special power-supply system of a kind of filament.
Background technology
Micro-connection weldering is exactly after workpiece combination, to exert pressure by electrode, to utilize electric current by the contact-making surface of jointAnd the resistance heat method of welding that produces of adjacent domain. Utilize electric current flow through workpiece contact-making surface and adjacent domainThe resistance heat effect producing is heated fusing or mecystasis, and acid extraction difference makes it to formA kind of method of metal combination. When resistance welding nugget forms, surrounded all the time deposite metal and air by plasticity ringIsolated, metallurgical process is simple. Heat time is short, and heat is concentrated, therefore heat affected area is little, deformation and stress is also little,Conventionally needn't arrange to proofread and correct and heat treatment step at postwelding. Simple to operate, be easy to realize mechanization and automation,Improve working condition; Productivity ratio is high, and noiseless and pernicious gas.
In welding is produced, often need carry out precision welding to miniature parts such as of the same race or dissimilar metal filaments, conventionallyMethod be to adopt capacitance energy storage type resistance spot weld to weld. Condenser discharge welder can be within the extremely short timeProvide concentrated energy to weld zone, but its major defect is the discharge current waveform adjustability in welding processPoor, cannot carry out Current Control, also just can not accurately control weld heating process, this is tight for ask for somethingLattice and accurate welding product is just difficult to be suitable for. The welding of silks as various in certain medicine equipment, butt welding point when its weldingIntensity and toughness, splash and control and product percent of pass has high requirement, must employing can be instantaneous to exportingThe resistance spot welding power supply that current waveform carries out accurately controlling could meet the requirement of welding procedure and welding quality.
Summary of the invention
The problem existing for background technology, the invention provides the micro-connection special power-supply system of a kind of filament. ThisBright is based on the thermally coupled power supply of the monolithic processor controlled Novel resistor of ATmega8, the certain hour that can requireMicro-connection electric current of output random waveform in scope, can meet thin especially silk completely and connect, and this power supply also canFor other fields such as minisize component manufactures, start new side for realizing the precision welding of metal micro partsMethod.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The micro-connection special power-supply system of a kind of filament, comprises the contravariant high power switching power supply that output voltage is adjustableWith current waveform output circuit; Current waveform output circuit comprises single-chip microcomputer and plural constant current circuit;Each constant current circuit is connected with contravariant high power switching power supply, single-chip microcomputer respectively.
Described constant current circuit comprises NPN pliotron and PNP pliotron; PNP pliotronColelctor electrode be connected with the base stage of NPN pliotron; ; The emitter stage of PNP pliotron and working powerConnect; The emitter stage of NPN pliotron is connected the IO mouth of single-chip microcomputer and PNP pliotron with ground wireBase stage connects, and the on off state of its power ratio control triode is controlled the output of current waveform; Contravariant is high-powerSwitching Power Supply is connected with the colelctor electrode of NPN pliotron.
Described single-chip microcomputer is connected with two air-operated solenoid valves of welding machine; Specifically be connected to: two IO of single-chip microcomputerMouth is respectively by after photoelectric coupled device T1, T2 isolation, respectively by triode control 24V relay J 1, J2The opening and disconnect of coil power, thus the energising of two air-operated solenoid valve DF1, DF2 of welding machine controlled respectivelyWith power-off, realize the pressurization of butt-welding fitting.
The contravariant high power switching power supply that described output voltage is adjustable comprises the master control system based on PWM, andThe holding circuit, voltage given circuit, the current rectifying and wave filtering circuit that are connected respectively with master control system.
Described voltage given circuit comprises voltage-regulation potentiometer, gives by voltage-regulation potentiometer regulation voltageDetermine the output voltage of circuit.
Comprise 9 constant current circuits.
Described single-chip microcomputer adopts ATmega8.
In the present invention, single-chip microcomputer to the control method of micro-connection current waveform is: pliotron is opened high-powerClose output current under power supply service voltage condition, the output voltage of high power switching power supply is according to output current sizeAnd it is adjustable; The triode of a power amplifier PNP of IO mouth control of single-chip microcomputer, it works on off state,The base stage input current of controlling one group of pliotron NPN, forms constant base current; Utilize triodeEnlarging function obtains constant electric current, and the different input resistance of pliotron is set, and can obtain different defeatedGo out electric current, the present invention includes 0.5A, 1.0A, 2.0A, 4.0A, 8AGe mono-tunnel, 12A electric current five tunnels,The control of an IO mouth of every route single-chip microcomputer, accurately controls switch time on every road, and multichannel pliotron is at listUnder the control of sheet machine, carry out parallel connection, form the pulse current of various waveforms; The output current of power supply 0～75A, timeBetween in the scope of 0.0～1999.9ms, current waveform is adjustable arbitrarily, electric current, Timing precision are respectively0.5A, 0.1ms; Whole output circuit is without filter inductance, therefore its output current rate of climb is fast.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, the present invention has realized any control of current waveform in micro-connection energising certain hour, makes to adoptOptimal current waveform filament is connected to become possibility, ensures according to set-point output constant current, opens upNew any control point of current waveform welding method, be the micro-connection of a kind of desirable precision resistance heatPower supply.
2, the present invention is based on the thermally coupled power supply of the monolithic processor controlled Novel resistor of ATmega8, Ke YiWithin the scope of the certain hour requiring, the connection of output random waveform connects electric current, can meet completelyThin especially silk connects, and this power supply also can be used for the other fields such as minisize component manufacture, forRealize the precision welding of metal micro parts and started new method.
Brief description of the drawings
Fig. 1 is integrated circuit figure of the present invention;
Fig. 2 is the circuit diagram of constant current circuit in the present invention;
Fig. 3 is the block diagram of the adjustable contravariant high power switching power supply of output voltage in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
The present invention includes the adjustable contravariant high power switching power supply of output voltage and any current waveform output electricityTwo, road part composition, is shown in Fig. 1, and current waveform output circuit forms by single-chip microcomputer with by pliotron arbitrarily9 constant current circuits compositions (what specifically present in Fig. 1 has 4), 9 IO mouth control merits of single-chip microcomputerThe on off state of rate triode, has realized any control of electric current output waveform in micro-connection energising certain hour,Make to adopt optimal current waveform filament to be connected to become possibility, ensure according to set-point output constant current, opened up newAny control point of current waveform welding method is the micro-connection power supply of a kind of desirable precision resistance heat.
Single chip computer AT mega8 controls tow channel gas moving electromagnetic valve simultaneously, after photoelectric coupled device T1, T2 isolation,Through the break-make of triode control 24V relay J, J2 coil power, thereby control 220v air-operated solenoid valve DF1,DF2 energising and power-off, finally realize the pressurization of butt-welding fitting, and the output of two-way relay is used for controlling air-powered electromagnetic and changesTo valve, realize the pressurization successively of two solder joints on butt-welding fitting by solenoid directional control valve control pneumatic circuit.
In the present invention, single-chip microcomputer to the control method of micro-connection current waveform is: pliotron is at contravariantOutput current under high power switching power supply service voltage condition, the output voltage root of contravariant high power switching power supplyAdjustable according to the needs of output current size; The triode of a power amplifier PNP of IO mouth control of single-chip microcomputer,It works on off state, controls the base stage input current of one group of pliotron NPN, forms constant base stageElectric current, as Fig. 1. Utilize the enlarging function of triode to obtain constant electric current, pliotron is set differentInput resistance, can obtain different output currents, and the present invention is designed with 0.5A, 1.0A, and 2.0A, 4.0A,8AGe mono-tunnel, 12A electric current five tunnels, the control of an IO mouth of every route single-chip microcomputer, accurately controls the switch on every roadTime, multichannel pliotron carries out parallel connection under Single-chip Controlling, forms the pulse current of various waveforms. ElectricityThe output current in source is in 0～75A, the scope of time at 0.0～1999.9ms, and current waveform is adjustable arbitrarily,Electric current, Timing precision are respectively 0.5A, 0.1ms. Whole output circuit is without filter inductance, therefore it is defeatedGo out Current rise speed fast.
The control method (micro-connection technique) of above-mentioned micro-connection current waveform is worked out at host computer (microcomputer),Welding parameter, by AVR SCM ISP serial line interface and upper machine communication, is cured, and is kept at single-chip microcomputerIn flash memory, be convenient to revise technique ginseng, the Q1 of Fig. 1 is power initiation button, presses this key, and isSystem work once, is exported one group of dipulse electric current. The K1 of Fig. 1, K2, K3, K4 is combined into welding parameter choosingSelect operating key, single-chip microcomputer is according to K1, K2, K3, K4 different combination select different according to program settingElectric current and ageing, parameter curing in single-chip microcomputer is selected wherein one group, can control altogether 16 groups of techniquesParameter. Monolithic function butt welding termination process is controlled, and monitoring welding machine ensures that welding machine moves with security and stability.
Constant current circuit is shown in Fig. 2, and an IO mouth PDX of single-chip microcomputer controls one by biasing circuit R3 and R4The base current of individual PNP triode, makes PNP triode also work in on-off mode, controls by resistance R 6The base stage input current of pliotron NPN, forms constant base current, also just forms a NPN powerTriode forms constant collected current. The resistance that R6 is different can form different collected currents, NPN powerTriode works in linear amplification mode, uses the resistance of different R6 resistances so just to form 0.5A, 1.0A,2.0A, the continuous current of 4.0A. 1 NPN pliotron of PNP triode control, forms 4.0AContinuous current; 3 NPN pliotrons of PNP triode control, the continuous current of formation 12.0A.Than adopting, the detection feedback circuit speed such as Hall current sensor are fast, are highly suitable for the fast of micro-connection current waveformSpeed control system. Power-supply system Current Sensorless detects feedback unit, good economy performance.
Fig. 3 is the adjustable Switching Power Supply of output voltage, and it is 25Khz that high power switching power supply adopts reverse frequency,The control of high power switching power supply circuit is constant voltage control, and given voltage adds certain deviation amount group by weld zone voltageBecome, adopted higher reverse frequency, Timing and FEEDBACK CONTROL cycle are less than or equal to 1ms, and responseHurry up, control accuracy is higher, parameter adjustable range is wide etc.
Except above-mentioned advantage, distinguishing feature energy-efficient, small-size light-weight that the present invention also has. Inverter circuit is defeatedGo out to hold and connect certain capacity capacitor group, being applicable to the various loads such as resistive, perceptual; Switching Power Supply possess phase shortage,The defencive functions such as overheated, pressure limiting, overvoltage, overcurrent, short circuit, overload. High-frequency PWM hardware adjustment control skillArt, reaction speed is fast, stable output; Workload-adaptability is strong; Have output voltage stabilizing, current limliting, short-circuit protection andPower device overheat protective function; Particularly inversion direct current power supply output voltage is adjusted according to micro-connection required voltageJoint, reduces the useless power consumption on pliotron, saves the energy. Voltage given circuit in Fig. 3 comprises multi-turnVoltage-regulation potentiometer, circle voltage-regulation potentiometer can be controlled output voltage and regulate within the specific limits; OperationEasy, regulate resolving power high; The input circuit of Switching Power Supply mostly adopts rectification to add capacitor filter. DefeatedEnter circuit close a floodgate moment can form very large temporary impact electric current, tend to cause inputting fuse and blow, evenBy the burning of contact of closing switch, the soft starting circuit that prevents dash current is set for this reason, to ensure Switching Power SupplyNormally and reliably operation.
Claims (6)
1. the micro-connection special power-supply system of filament, is characterized in that: comprise that the adjustable contravariant of output voltage is largePower switch power source and current waveform output circuit; Current waveform output circuit comprise single-chip microcomputer and two withOn constant current circuit; Each constant current circuit connects with contravariant high power switching power supply, single-chip microcomputer respectivelyConnect;
Described constant current circuit comprises NPN pliotron and PNP pliotron; PNP pliotronColelctor electrode be connected with the base stage of NPN pliotron, the emitter stage of PNP pliotron and working powerConnect, the emitter stage of NPN pliotron is connected with ground wire; The IO mouth of single-chip microcomputer and PNP power three utmost pointsThe base stage of pipe connects, and the on off state of its power ratio control triode is controlled the output of current waveform; InversionFormula high power switching power supply is connected with the colelctor electrode of NPN pliotron.
2. the micro-connection special power-supply system of a kind of filament according to claim 1, is characterized in that: described listSheet machine is connected with two air-operated solenoid valves of welding machine, is provided with photoelectricity coupling between single-chip microcomputer and air-operated solenoid valveClose device, triode, 24V relay coil; Specifically be connected to: two IO mouths of single-chip microcomputer respectively byAfter photoelectric coupled device T1, T2 isolation, respectively by triode control 24V relay J 1, J2 coilThe opening and disconnect of power supply, thus control respectively welding machine two air-operated solenoid valve DF1, DF2 energising withPower-off, realizes the pressurized control of butt-welding fitting.
3. the micro-connection special power-supply system of a kind of filament according to claim 2, is characterized in that: described defeatedGo out the adjustable contravariant high power switching power supply of voltage and comprise the master control system based on PWM, and and master controlHolding circuit, voltage given circuit, current rectifying and wave filtering circuit that system connects respectively.
4. the micro-connection special power-supply system of a kind of filament according to claim 3, is characterized in that: describedVoltage given circuit comprises voltage-regulation potentiometer, passes through voltage-regulation potentiometer according to welding current sizeThe output voltage of regulation voltage given circuit.
5. the micro-connection special power-supply system of a kind of filament according to claim 4, is characterized in that: comprise 6Plant 9 constant current circuits of different current values.
6. the micro-connection special power-supply system of a kind of filament according to claim 5, is characterized in that: described listSheet machine adopts ATmega8, forms two by the switch of 9 constant current circuits of timer interrupt timing controlThe required current waveform of individual micro-connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410165133.4A CN103934562B (en) | 2014-04-23 | 2014-04-23 | The micro-connection special power-supply system of a kind of filament |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410165133.4A CN103934562B (en) | 2014-04-23 | 2014-04-23 | The micro-connection special power-supply system of a kind of filament |
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| Publication Number | Publication Date |
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| CN103934562A CN103934562A (en) | 2014-07-23 |
| CN103934562B true CN103934562B (en) | 2016-05-25 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5120929A (en) * | 1988-11-17 | 1992-06-09 | Honda Giken Kogyo Kabushiki Kaisha | Dc resistance welding apparatus |
| CN1271631A (en) * | 1999-04-23 | 2000-11-01 | 宫地技术株式会社 | Power supply apparatus for resistance welding |
| CN101733537A (en) * | 2008-11-13 | 2010-06-16 | 贵州红湖机械厂 | Resistance welding constant-current control device |
| CN102554441A (en) * | 2011-12-02 | 2012-07-11 | 贵州黎阳航空动力有限公司 | Constant-current control device for welding power source of medium-frequency inverter resistance electric welding machine and control method for welding power source |
| CN202741915U (en) * | 2012-07-26 | 2013-02-20 | 应城骏腾发自动焊接装备有限公司 | Intelligent control system for inverter constant current electric resistance welding |
-
2014
- 2014-04-23 CN CN201410165133.4A patent/CN103934562B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5120929A (en) * | 1988-11-17 | 1992-06-09 | Honda Giken Kogyo Kabushiki Kaisha | Dc resistance welding apparatus |
| CN1271631A (en) * | 1999-04-23 | 2000-11-01 | 宫地技术株式会社 | Power supply apparatus for resistance welding |
| CN101733537A (en) * | 2008-11-13 | 2010-06-16 | 贵州红湖机械厂 | Resistance welding constant-current control device |
| CN102554441A (en) * | 2011-12-02 | 2012-07-11 | 贵州黎阳航空动力有限公司 | Constant-current control device for welding power source of medium-frequency inverter resistance electric welding machine and control method for welding power source |
| CN202741915U (en) * | 2012-07-26 | 2013-02-20 | 应城骏腾发自动焊接装备有限公司 | Intelligent control system for inverter constant current electric resistance welding |
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| CN103934562A (en) | 2014-07-23 |
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