CN101480749A - Total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output - Google Patents
Total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output Download PDFInfo
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- CN101480749A CN101480749A CN 200810203859 CN200810203859A CN101480749A CN 101480749 A CN101480749 A CN 101480749A CN 200810203859 CN200810203859 CN 200810203859 CN 200810203859 A CN200810203859 A CN 200810203859A CN 101480749 A CN101480749 A CN 101480749A
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Abstract
The invention relates to a fully digital control method of pulse variable-polarity arc welding inverse power supply, comprising the following steps of: (1) achieving the human-computer information interaction, the setting and control of switching value and computer serial port communication service management through a first DSP chip; (2) performing pulse width modulation (PWM) and PID feedback control for a power switching circuit according to the customized welding parameters through a second DSP chip; and (3) monitoring various working statuses of the welding power supply in real time by using a dual-port RAM as a communication bridge and the cooperation of the first and second DSP chips, preferably, in the welding process, synchronizing A/D sampling and PWM, and using the DSP56F805 chip for the first and second DSP chips. The invention needs less hardware, has stability and reliability, and achieves the output characteristic control of the pulse variable-polarity arc welding inverse power supply and the waveform control of the AC/DC composite pulse current.
Description
Technical field
The present invention relates to relate to the power control method technical field, particularly inverter digitalization control method technical field specifically is meant a kind of total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output.
Background technology
Digitlization pulse width modulation (PWM) technology is to realize the key of arc welding inverter full-digital control.Existing document adopts digital signal processor (DSP) to realize data acquisition, control algolithm as the main control chip of system, the PWM data that computing is obtained are sent into the digital PWM generator that CPLD (CPLD) is formed then, produce to satisfy the pwm pulse that power supply output control requires.Also have document that the operation result of microprocessor (MCU) is sent into the dedicated PWM chip after the D/A conversion, produce the PWM control impuls.Adopt above-mentioned dual mode to realize that the digitlization of PWM control impuls all need increase relevant hardware, need cooperate corresponding software programming simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output, the required hardware of this control method is few, reliable and stable, realized that the output characteristics of inverter-controlled arc welding power supply with pulsed variable polarity output is controlled and alternating current-direct current composite pulse Current Waveform Control.
To achieve the above object, the invention provides a kind of total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output, it comprises step:
1) realizes the given and control and the computer serial communication transaction management of man-machine information interaction, switching value by first dsp chip;
2) according to the welding parameter that the user sets power conversion circuit is carried out pulse width modulation and PID FEEDBACK CONTROL by second dsp chip;
3) with the dual port RAM be communication bridge, first dsp chip and second dsp chip cooperate, and the various duties of the source of welding current are monitored in real time.
Preferably, in welding process, make the A/D sampling synchronous with PWM.
Preferably, described first dsp chip and described second dsp chip adopt the DSP56F805 chip.
Method of the present invention adopts two dsp chips, first dsp chip mainly realize system man-machine information interaction (keyboard and LCD), supply gas and transaction management such as the given and control of switching value such as high-frequency arc strike and computer serial communication; Second dsp chip mainly carries out pulse width modulation and PID FEEDBACK CONTROL according to the welding parameter that the user sets to power conversion circuit, simultaneously, with the dual port RAM is communication bridge, first dsp chip and second dsp chip cooperate, various duties to the source of welding current are monitored in real time, can realize the required welding current waveform of the multiple TIG of carrying out welding neatly, as conventional DC, pulse direct current, common square wave alternating-current, pulse square wave exchanges Variable Polarity and exchanges and exchanges (pulse square wave interchange and direct current are compound) etc. with pulsed variable polarity output, realize the output characteristics control and the alternating current-direct current composite pulse Current Waveform Control of inverter-controlled arc welding power supply with pulsed variable polarity output, simple for structure, adopt the A/D sampling synchronous, reliable and stable with PWM.
Description of drawings
Fig. 1 is an operation principle schematic diagram of the present invention.
The specific embodiment
Below will describe in further detail capacitance energy storage type inversion spot welding method of the present invention.
See also shown in Figure 1; be used for inverter-controlled arc welding power supply with pulsed variable polarity output full-digital control of the present invention system; comprise first dsp chip, human-machine interface module, switching value interface module, second dsp chip and power conversion module; described human-machine interface module and described switching value interface module are electrically connected described first dsp chip respectively; described first dsp chip is electrically connected described second dsp chip, and described second dsp chip is electrically connected with described power model by protection interface module, driver module and electric current and voltage acquisition module respectively.
Preferably, described first dsp chip and described second dsp chip are the DSP56F805 chips.
Preferably, described human-machine interface module comprises keyboard and display, and described keyboard and described display are electrically connected described first dsp chip respectively.
Preferably, also comprise dual port RAM, described first dsp chip is electrically connected described second dsp chip by described dual port RAM.
Preferably, also comprise computer, described computer is electrically connected described first dsp chip.
Preferably, also comprise linear isolation module, described electric current and voltage acquisition module is electrically connected described second dsp chip by described linear isolation module.
The power conversion module is made up of two phase commit filtering, a full-bridge inverting and a circuit such as semi-bridge inversion, an inversion adopts PWM control to realize the amplitude control of output voltage, electric current, and the Polarity Control that realizes output voltage, electric current is switched in an inversion by switch.
The DSP56F805 chip includes the PWM module of 15 precision of two 6 passages, and has half period parameter renegotiation loading capability.As required, 6 passages of each PWM module can be configured to complementary passage and autonomous channel, under complementary channel mode, and control Dead Time able to programme.Have independently top, the control of end output polarity and edge alignment and two kinds of pulsewidth producing methods of center-aligned, and dutycycle is adjustable in 0～100% scope.And independently the software control pwm pulse way of output seems that to realizing the output of low frequency pwm pulse especially tribute will.In addition, the PWM module also has the defencive function of makeing mistakes able to programme, implements reliable protection by the quick closedown pwm pulse for arc welding inverter under various failure conditions valid approach is provided.
Method of the present invention adopts two DSP56F805 chips, connect by dual port RAM ID70V261S35, first dsp chip mainly realize system man-machine information interaction (keyboard and LCD), supply gas and transaction managements such as the given and control of switching value such as high-frequency arc strike and computer serial communication; Second dsp chip mainly carries out pulse width modulation and PID FEEDBACK CONTROL according to the welding parameter that the user sets to power conversion circuit, can realize the required welding current waveform of the multiple TIG of carrying out welding neatly, as conventional DC, pulse direct current, common square wave alternating-current, pulse square wave exchanges Variable Polarity and exchanges and exchanges (pulse square wave interchange and direct current are compound) etc. with pulsed variable polarity output, realize the output characteristics control and the alternating current-direct current composite pulse Current Waveform Control of inverter-controlled arc welding power supply with pulsed variable polarity output, simultaneously, first dsp chip and second dsp chip cooperate, various duties to the source of welding current are monitored in real time, prevent voltage by the A/D sampling synchronously with PWM, current spike is to the influence of A/D sampling, with the stability of assurance system control.
To sum up, the required hardware of total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output of the present invention is few, and is reliable and stable, realized the output characteristics control and the alternating current-direct current composite pulse Current Waveform Control of inverter-controlled arc welding power supply with pulsed variable polarity output.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (3)
1. a total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output is characterized in that, comprises step:
1) realizes the given and control and the computer serial communication transaction management of man-machine information interaction, switching value by first dsp chip;
2) according to the welding parameter that the user sets power conversion circuit is carried out pulse width modulation and PID FEEDBACK CONTROL by second dsp chip;
3) with the dual port RAM be communication bridge, first dsp chip and second dsp chip cooperate, and the various duties of the source of welding current are monitored in real time.
2. total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output as claimed in claim 1 is characterized in that, in welding process, makes the A/D sampling synchronous with PWM.
3. total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output as claimed in claim 1 is characterized in that, described first dsp chip and described second dsp chip adopt the DSP56F805 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810203859 CN101480749A (en) | 2008-12-02 | 2008-12-02 | Total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output |
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| CN 200810203859 CN101480749A (en) | 2008-12-02 | 2008-12-02 | Total digital control method for inverter-controlled arc welding power supply with pulsed variable polarity output |
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| CN101480749A true CN101480749A (en) | 2009-07-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844264A (en) * | 2010-04-23 | 2010-09-29 | 江苏科技大学 | Digital communication inverter type gas-shielded welder |
| CN102135770A (en) * | 2011-01-24 | 2011-07-27 | 中国第一汽车集团公司 | Circuit structure of electric resistance welding process quality monitoring system |
| CN102218581A (en) * | 2011-04-28 | 2011-10-19 | 北京工业大学 | Composite high-frequency pulse welding system and process |
-
2008
- 2008-12-02 CN CN 200810203859 patent/CN101480749A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844264A (en) * | 2010-04-23 | 2010-09-29 | 江苏科技大学 | Digital communication inverter type gas-shielded welder |
| CN102135770A (en) * | 2011-01-24 | 2011-07-27 | 中国第一汽车集团公司 | Circuit structure of electric resistance welding process quality monitoring system |
| CN102218581A (en) * | 2011-04-28 | 2011-10-19 | 北京工业大学 | Composite high-frequency pulse welding system and process |
| CN102218581B (en) * | 2011-04-28 | 2013-11-20 | 北京工业大学 | Composite high-frequency pulse welding system and process |
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Open date: 20090715 |