CN103934562A - Special power system for filament micro connection - Google Patents
Special power system for filament micro connection Download PDFInfo
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- CN103934562A CN103934562A CN201410165133.4A CN201410165133A CN103934562A CN 103934562 A CN103934562 A CN 103934562A CN 201410165133 A CN201410165133 A CN 201410165133A CN 103934562 A CN103934562 A CN 103934562A
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- micro
- chip microcomputer
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- filament
- power
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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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- Mechanical Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention provides a special power system for filament micro connection. The system comprises an inversion-type high-power switched-mode power source adjustable in output voltage and a current waveform output circuit; the current waveform output circuit comprises a single-chip microcomputer and two or more constant-current circuits; all the constant-current circuits are respectively connected with the inversion-type high-power switched-mode power source and the single-chip microcomputer. The special power system for filament micro connection is a novel power source for resistant heat filament micro connection based on the ATmega8 single-chip microcomputer, the power source system can output micro connection currents with any waveform within a required time range, and the extra-thin filament connection requirement can be fully met; the special power system for filament micro connection can also be used in the field of manufacturing of micro components and other fields, and a new method is created for achievement of precise welding of micro metal 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, the method that the resistance heat that utilizes electric current to produce by contact-making surface and the adjacent domain of joint welds.Resistance heat effect that workpiece contact-making surface and adjacent domain produce is heated fusing or mecystasis to utilize electric current to flow through, and acid extraction difference makes it to form a kind of method of metal combination.When resistance welding nugget forms, surrounded all the time by plasticity ring, deposite metal and air are isolated, and 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, usual way is to adopt capacitance energy storage type resistance spot weld to weld.Condenser discharge welder can provide concentrated energy within the extremely short time to weld zone, but its major defect is that the discharge current waveform adjustability in welding process is poor, cannot carry out Current Control, also just can not accurately control weld heating process, this is just difficult to be suitable for for the strict and accurate welding product of ask for something.The welding of silks as various in certain medicine equipment, its when welding in butt welding point intensity and toughness, splash and control and product percent of pass has high requirement, the resistance spot welding power supply that must employing can carry out accurately control to output transient current waveform 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.The present invention is based on the thermally coupled power supply of the monolithic processor controlled Novel resistor of ATmega8, can within the scope of the certain hour requiring, export micro-connection electric current of random waveform, can meet thin especially silk completely connects, this power supply 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.
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 adjustable
With 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 pliotron
Colelctor electrode be connected with the base stage of NPN pliotron; ; The emitter stage of PNP pliotron is connected with working power; The emitter stage of NPN pliotron is connected single-chip microcomputer IO mouth with ground wire is connected with the base stage of PNP pliotron, and the on off state of its power ratio control triode is controlled the output of current waveform; Contravariant high power switching 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 microcomputer
Mouth is respectively by after photoelectric coupling device T1, T2 isolation, respectively by the opening and disconnect of triode control 24V relay J 1, J2 coil power, thereby controls respectively energising and the power-off of two air-operated solenoid valve DF1, DF2 of welding machine, realizes 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, and
The 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 voltage
Determine 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 output current under high power switching power supply service voltage condition, and the output voltage of high power switching power supply is big or small and adjustable according to output current; 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 current; Utilize the enlarging function of triode to obtain constant electric current, the different input resistance of pliotron is set, can obtain different output currents, 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, multichannel pliotron carries out parallel connection under Single-chip Controlling, forms the pulse current of various waveforms; The output current of power supply is in 0 ~ 75A, the scope of time at 0.0 ~ 1999.9ms, and current waveform is adjustable arbitrarily, and electric current, Timing precision are respectively 0.5A, 0.1 ms; 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, make to adopt optimal current waveform filament to be connected to become possibility, ensure according to set-point output constant current, having opened up any control point of new current waveform welding method, is the micro-connection power supply of a kind of desirable precision resistance heat.
2, the present invention is based on the thermally coupled power supply of the monolithic processor controlled Novel resistor of ATmega8, the connection that can export random waveform within the scope of the certain hour requiring connects electric current, can meet thin especially silk completely connects, this power supply 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.
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 two part compositions of the adjustable contravariant high power switching power supply of output voltage and any current waveform output circuit, see Fig. 1, 9 constant current circuits that current waveform output circuit forms by single-chip microcomputer with by pliotron arbitrarily form (what in Fig. 1, specifically present has 4), the on off state of 9 IO mouth power ratio control triodes of single-chip microcomputer, realize 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, open up any control point of new current waveform welding method, it 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 coupling 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, the output of two-way relay is used for controlling Pneumatic solenoid valves, realizes 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 output current under contravariant high power switching power supply service voltage condition, and the output voltage of contravariant high power switching power supply is according to the needs of output current size and adjustable; 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 current, as Fig. 1.Utilize the enlarging function of triode to obtain constant electric current, the different input resistance of pliotron is set, can obtain different output currents, the present invention is designed with 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, multichannel pliotron carries out parallel connection under Single-chip Controlling, forms the pulse current of various waveforms.The output current of power supply is in 0 ~ 75A, the scope of time at 0.0 ~ 1999.9ms, and current waveform is adjustable arbitrarily, and electric current, Timing precision are respectively 0.5A, 0.1 ms.Whole output circuit is without filter inductance, therefore its output current rate of climb is fast.
The control method (micro-connection technique) of above-mentioned micro-connection current waveform is worked out at host computer (microcomputer), welding parameter is by AVR SCM ISP serial line interface and upper machine communication, be cured, be kept in single-chip microcomputer flash memory, be convenient to revise technique ginseng, the Q1 of Fig. 1 is power initiation button, presses this key, system works once, is exported one group of dipulse electric current.The K1 of Fig. 1, K2, K3, K4 is combined into welding parameter and selects operating key, single-chip microcomputer is according to K1, K2, K3, K4 different combination select different electric currents and ageing according to program setting, in single-chip microcomputer, curing parameter is selected wherein one group, can control altogether 16 groups of technological parameters.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, an IO mouth PDX of single-chip microcomputer controls the base current of a PNP triode by biasing circuit R3 and R4, make PNP triode also work in on-off mode, by the base stage input current of resistance R 6 power ratio control triode NPN, form constant base current, also just form a NPN pliotron and form constant collected current.The resistance that R6 is different can form different collected currents, and NPN pliotron 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, the continuous current of formation 4.0A; 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 quick control of micro-connection current waveform.Power-supply system Current Sensorless detects feedback unit, good economy performance.
Fig. 3 is the adjustable Switching Power Supply of output voltage, it is 25K hz that high power switching power supply adopts reverse frequency, the control of high power switching power supply circuit is constant voltage control, given voltage adds certain deviation amount by weld zone voltage and forms, adopt higher reverse frequency, Timing and FEEDBACK CONTROL cycle are less than or equal to 1 ms, and response is very fast, 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 output also connects certain capacity capacitor group, is applicable to the various loads such as resistive, perceptual; Switching Power Supply possesses the defencive functions such as phase shortage, overheated, pressure limiting, overvoltage, overcurrent, short circuit, overload.High-frequency PWM hardware adjustment control technology, reaction speed is fast, stable output; Workload-adaptability is strong; There is output voltage stabilizing, current limliting, short-circuit protection and power device overheat protective function; Particularly inversion direct current power supply output voltage regulates according to micro-connection required voltage, reduces the useless power consumption on pliotron, saves the energy.Voltage given circuit in Fig. 3 comprises multi-turn voltage-regulation potentiometer, and circle voltage-regulation potentiometer can be controlled output voltage and regulate within the specific limits; Easy and simple to handle, regulate resolving power high; The input circuit of Switching Power Supply mostly adopts rectification to add capacitor filter.Can form very large temporary impact electric current in input circuit moment of closing a floodgate, tend to cause inputting fuse and blow, even by the burning of contact of closing switch, arrange and prevent the soft starting circuit of dash current for this reason, to ensure that Switching Power Supply normally and reliably moves.
Claims (7)
1. the micro-connection special power-supply system of filament, is characterized in that: 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.
2. the micro-connection special power-supply system of a kind of filament according to claim 1, is characterized in that: described constant current circuit comprises NPN pliotron and PNP pliotron; The colelctor electrode of PNP pliotron is connected with the base stage of NPN pliotron, and the emitter stage of PNP pliotron is connected with working power, and the emitter stage of NPN pliotron is connected with ground wire; The IO mouth of single-chip microcomputer is connected with the base stage of PNP pliotron, and the on off state of its power ratio control triode is controlled the output of current waveform; Contravariant high power switching power supply is connected with the colelctor electrode of NPN pliotron.
3. the micro-connection special power-supply system of a kind of filament according to claim 1 and 2, it is characterized in that: described single-chip microcomputer is connected with two air-operated solenoid valves of welding machine, is provided with photoelectric coupling device, triode, 24V relay coil between single-chip microcomputer and air-operated solenoid valve; Specifically be connected to: two IO mouths of single-chip microcomputer are respectively by after photoelectric coupling device T1, T2 isolation, opening and disconnecting by triode control 24V relay J 1, J2 coil power respectively, thereby control respectively energising and the power-off of two air-operated solenoid valve DF1, DF2 of welding machine, realize the pressurized control of butt-welding fitting.
4. the micro-connection special power-supply system of a kind of filament according to claim 1 and 2; it is characterized in that: the contravariant high power switching power supply that described output voltage is adjustable comprises the master control system based on PWM, and the holding circuit being connected respectively with master control system, voltage given circuit, current rectifying and wave filtering circuit.
5. the micro-connection special power-supply system of a kind of filament according to claim 4, is characterized in that: described voltage given circuit comprises voltage-regulation potentiometer, passes through the output voltage of voltage-regulation potentiometer regulation voltage given circuit according to welding current size.
6. the micro-connection special power-supply system of a kind of filament according to claim 5, is characterized in that: 9 constant current circuits that comprise 6 kinds of different current values.
7. according to the micro-connection special power-supply system of a kind of filament described in claim 5 or 6, it is characterized in that: described single-chip microcomputer adopts ATmega8, form two required current waveforms of micro-connection by the switch of 9 constant current circuits of timer interrupt timing control.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN103934562A true CN103934562A (en) | 2014-07-23 |
| CN103934562B CN103934562B (en) | 2016-05-25 |
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| CN201410165133.4A Expired - Fee Related CN103934562B (en) | 2014-04-23 | 2014-04-23 | The micro-connection special power-supply system of a kind of filament |
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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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| CN103934562B (en) | 2016-05-25 |
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Granted publication date: 20160525 Termination date: 20170423 |