CN101474714A - Accurate inverter resistance spot welding power supply DSP control method - Google Patents
Accurate inverter resistance spot welding power supply DSP control method Download PDFInfo
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- CN101474714A CN101474714A CN 200810203844 CN200810203844A CN101474714A CN 101474714 A CN101474714 A CN 101474714A CN 200810203844 CN200810203844 CN 200810203844 CN 200810203844 A CN200810203844 A CN 200810203844A CN 101474714 A CN101474714 A CN 101474714A
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Abstract
The invention relates to a DSP control method for a precise contravariance resistance spot welding electric power source, comprising the following steps: 1) a DSP chip receives welding parameters input by an input unit for data processing and calculation and controls a welding machine to work by controlling a signal module; 2) meanwhile, a signal acquisition and protection module acquires actual welding parameters, the DSP chip executes fault judgments and adjusts signal output, the signal module is controlled to control the welding machine to work and achieve real-time guard, the DSP chip is a TMS320LF2407 chip, the signal acquisition and protection module acquires overheating, a primary voltage, a primary current, a secondary voltage and a secondary current of the electric power source, the signal module is controlled to control PWM, an air valve, soft start and multiplexed output, wherein, the multiplexed output comprises the output of a transformer alternative control signal and a counting signal as well as the output of a welding ending signal and an error signal. The invention has the advantages of high response speed and high control precision, and realizes multi-parameter monitoring and fault diagnosis.
Description
Technical field
The present invention relates to relate to the power control method technical field, particularly inverter resistance spot welding power supply control method technical field specifically is meant a kind of accurate inverter resistance spot welding power supply DSP control method.
Background technology
The inverter resistance spot welding machine has been compared with traditional resistance spot welding power supply since coming out, and has favorable manufacturability energy and dynamic response, and the welding process precision is controlled, and the point quality height has been subjected to attention more and more widely in recent years.Along with the progress of device for high-power power electronic, integrated circuit and high performance magnetic material, the development of The present computer technology and Digital Signal Processing, the technology of this kind equipment remains further to be improved.Traditional single-chip microcomputer such as MCS-51, MCS-96, in simple in structure, the function of 8088/86 chip such as grade one, oneself can not satisfy the requirement of control in real time of modern welding inverter power source, DSP be used to detect and analyze the alternating current welding resistance electric current oneself through attempting.
Digital signal processor DSP speed is fast, good reliability, because the design feature of himself, be a kind of control chip of possessing intensive calculation function more excellent than single-chip microcomputer, be suitable for real-time signal acquisition, handle application, in Electric Machine Control, obtained application more widely in recent years with side such as control.Therefore, can adopt DSP, simplify circuit design simultaneously, improve technology controlling and process, help realizing the intellectuality control of welding quality to improve control accuracy, response speed and the antijamming capability of resistance welding inverter.
Summary of the invention
The object of the present invention is to provide a kind of accurate inverter resistance spot welding power supply DSP control method, this control method response speed is fast, control accuracy is high, has realized the monitoring and the fault diagnosis of multi-parameter.
To achieve the above object, the invention provides a kind of accurate inverter resistance spot welding power supply DSP control method, it comprises step:
1) receives the welding parameter that input block is imported by dsp chip, carry out data and handle and computing, work by control signal module controls welding machine;
2) pass through the signals collecting protection module simultaneously and gather the actual welding parameter, do to be out of order by dsp chip and judge and the output adjustment,, realize real-time guard by the work of control signal module controls welding machine.
Preferably, described dsp chip adopts the TMS320LF2407 chip.
Preferably, described signals collecting and protection module are gathered overheated, primary voltage, primary current, secondary voltage and the secondary current of power supply.
Preferably, described control signal module controls PWM, air valve, soft start and multichannel output.
More preferably, described multichannel output comprises transformer selection control signal, count signal output, welding end signal and error signal output.
Adopted accurate inverter resistance spot welding power supply DSP control method of the present invention, utilize the TMS320LF2407 chip to handle the characteristics of mass data, fast operation and software change parameter high flexible in real time, can realize the adjustment of control scheme and control parameter easily, control inverter resistance spot welding power supply effectively, have characteristics such as dynamic response is fast, control accuracy is high, the control standard can be provided with flexibly; The supervision and the warning of welding current, inter-electrode voltage and welding energy have been realized; Can quick diagnosis and protection to exceptional conditions such as net voltage fluctuation, overcurrent, overheated, scarce cooling waters.
Description of drawings
Fig. 1 is an operation principle schematic diagram of the present invention.
The specific embodiment
Below will describe in further detail accurate inverter resistance spot welding power supply DSP control method of the present invention.
See also shown in Figure 1, accurate inverter resistance spot welding power supply DSP control method of the present invention, it comprises step: 1) received the welding parameter of input block input by dsp chip, carry out data and handle and computing, work by control signal module controls welding machine; 2) pass through the signals collecting protection module simultaneously and gather the actual welding parameter, do to be out of order by dsp chip and judge and the output adjustment,, realize real-time guard by the work of control signal module controls welding machine.
In a specific embodiment of the present invention, described dsp chip adopts the TMS320LF2407 chip.
In a specific embodiment of the present invention, described signals collecting and protection module are gathered overheated, primary voltage, primary current, secondary voltage and the secondary current of power supply.
Preferably, described control signal module controls PWM, air valve, soft start and multichannel output.
In a specific embodiment of the present invention, described multichannel output comprises transformer selection control signal, count signal output, welding end signal and error signal output.
Be suitable for accurate inverter resistance spot welding power supply DSP control system of the present invention; comprise DSP fundamental system module, signals collecting and protection module, human-machine interface module and control signal module, described signals collecting is electrically connected with described DSP fundamental system module respectively with protection module, described human-machine interface module and described control signal module.
Described signals collecting and protection module comprise the overtemperature protection unit that is electrically connected with described DSP fundamental system module respectively, once survey voltage cell, once survey current unit, secondary surveys voltage cell and secondary is surveyed current unit.
The overtemperature protection unit mainly is the detection of signals such as radiator temperature, rectifying tube temperature and cooling water flow.
In the primary current measuring unit, the current mode Hall element detects electric current, carries out filtering and active rectification again and handles.The filtering output voltage is linked the virtual value treatment circuit selectively; The rectification result is used to carry out maximum current to be judged, directly makes microcontroller interrupt welding process when current anomaly, effectively protects IGBT.Voltage measurement unit directly intercepts voltage according to a certain percentage and sends dsp chip analysis on electrical network, thereby learns whether electrical network has unusual fluctuation that protection system takes place.
The secondary current measuring unit is to utilize Luo-coil to measure a measuring circuit of the principle design of electric current.Because the signal that Luo-coil collects is the differential signal of electric current, at first will carry out integration, forms an integrating circuit that has direct current channel, form the outer integration type metering system of Luo-coil.The amplifying circuit that recomposition is amplified integral result, the voltage of amplification give the back and circuit carry out virtual value and handle.
The buffer circuit that the band that the secondary voltage measuring unit adopts linear optical coupling PC827 to form compensates further improves the linearity of measuring.The primary voltage of inversion electric resistance welding is pulse state, and its amplitude is lower, and closely related with test point, and measurement result is follow-up also through amplifying and the virtual value conversion, is connected to the A/D input port of DSP.In the design of buffer circuit, be to simplify the design of power supply, adopt the power isolation module of IAP-2W series, with 5V be converted to that ground wire isolates ± 15V, directly give amplifier and corresponding circuit supply.
Described control signal module comprises PWM control module, Air Valve Control unit, soft start control module and the multichannel output control unit that is electrically connected with described DSP fundamental system module respectively.Wherein the PWM control module has adopted two kinds of different circuit on circuit design, and one is directly to control with the output of the PWM on the dsp chip, and another is to utilize the external chip of D/A circuit to control.Wherein said multichannel output control unit comprises transformer selection controll block, count signal output controll block, welding finishing control piece and the error signal output controll block that is electrically connected with described DSP fundamental system module respectively.
Setup parameters such as the electric current that the present invention is imported by keyboard by the DSP reception, voltage, time; Each stage time-delay is carried out in control air valve action in the work chronologically, exports corresponding pwm signal in each heating period according to electric current and wave setting, and by feedback information adjustment output, reaches the purpose of control output energy; System can also detect bulk informations such as overheated, the once mistake/undercurrent output, net pressure of power supply at any time, and carries out real-time guard; DSP writes down various information and carries out exchanges data with other computers.Signals collecting and testing circuit are used for welding transformer's primary current, voltage, and secondary side output current, voltage are sampled, to realize multi parameters control and protection.
To sum up, accurate inverter resistance spot welding power supply DSP control method response speed of the present invention is fast, control accuracy is high, has realized the monitoring and the fault diagnosis of multi-parameter.
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 (5)
1. an accurate inverter resistance spot welding power supply DSP control method is characterized in that, comprises step:
1) receives the welding parameter that input block is imported by dsp chip, carry out data and handle and computing, work by control signal module controls welding machine;
2) pass through the signals collecting protection module simultaneously and gather the actual welding parameter, do to be out of order by dsp chip and judge and the output adjustment,, realize real-time guard by the work of control signal module controls welding machine.
2. accurate inverter resistance spot welding power supply DSP control method as claimed in claim 1 is characterized in that, described dsp chip adopts the TMS320LF2407 chip.
3. accurate inverter resistance spot welding power supply DSP control method as claimed in claim 1 is characterized in that, described signals collecting and protection module are gathered overheated, primary voltage, primary current, secondary voltage and the secondary current of power supply.
4. accurate inverter resistance spot welding power supply DSP control method as claimed in claim 1 is characterized in that, described control signal module controls PWM, air valve, soft start and multichannel output.
5. accurate inverter resistance spot welding power supply DSP control method as claimed in claim 4 is characterized in that, described multichannel output comprises transformer selection control signal, count signal output, welding end signal and error signal output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810203844 CN101474714A (en) | 2008-12-02 | 2008-12-02 | Accurate inverter resistance spot welding power supply DSP control method |
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| CN 200810203844 CN101474714A (en) | 2008-12-02 | 2008-12-02 | Accurate inverter resistance spot welding power supply DSP control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211239A (en) * | 2011-04-15 | 2011-10-12 | 南通三九焊接机器制造有限公司 | Digital signal processor (DSP)-based digital inversion welding power supply control system |
| CN104107977A (en) * | 2014-06-13 | 2014-10-22 | 广东省自动化研究所 | Resistance spot welding power control system with double processors |
| CN108746970A (en) * | 2018-03-30 | 2018-11-06 | 南京绥德自动焊接装备有限公司 | Current sensing means for medium frequency inverter electric resistance welding system |
| RU2701157C2 (en) * | 2014-09-30 | 2019-09-25 | Зе Боинг Компани | Parallel modular converter structure |
-
2008
- 2008-12-02 CN CN 200810203844 patent/CN101474714A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102211239A (en) * | 2011-04-15 | 2011-10-12 | 南通三九焊接机器制造有限公司 | Digital signal processor (DSP)-based digital inversion welding power supply control system |
| CN104107977A (en) * | 2014-06-13 | 2014-10-22 | 广东省自动化研究所 | Resistance spot welding power control system with double processors |
| RU2701157C2 (en) * | 2014-09-30 | 2019-09-25 | Зе Боинг Компани | Parallel modular converter structure |
| US11431176B2 (en) | 2014-09-30 | 2022-08-30 | The Boeing Company | Parallel modular converter architecture |
| CN108746970A (en) * | 2018-03-30 | 2018-11-06 | 南京绥德自动焊接装备有限公司 | Current sensing means for medium frequency inverter electric resistance welding system |
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Open date: 20090708 |