CN203541812U - MCU (microprogrammed control unit)-based welding power device - Google Patents
MCU (microprogrammed control unit)-based welding power device Download PDFInfo
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- CN203541812U CN203541812U CN201320614896.3U CN201320614896U CN203541812U CN 203541812 U CN203541812 U CN 203541812U CN 201320614896 U CN201320614896 U CN 201320614896U CN 203541812 U CN203541812 U CN 203541812U
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Abstract
The utility model discloses an MCU (microprogrammed control unit)-based welding power device, which comprises an MCU module, wherein the analogue signal input end of the MCU module is connected with a power grid voltage input module, a welding power current output module, a welding power voltage output module and a temperature measurement device respectively; the switching signal input end of the MCU module is connected with a welding power abnormity signal module; one output end of the MCU module is connected with a PWM (pulse width modulation) module, and outputs a PWM signal, and the other end of the MCU module is connected with a fan, and outputs a starting and stopping control signal; the temperature measurement device is a temperature sensor or a thermistor. According to the MCU-based welding power device, power grid voltage and the temperature of key components are checked in real time, the fan is controlled to be started and stopped for overheat protection, and the work of a machine is rapidly stopped in case of abnormity, so that the reliability of the welding power device is greatly improved, the circuit structure is simplified, and the control accuracy is improved.
Description
Technical field
The utility model relates to a kind of welding supply, relates in particular to a kind of welding supply based on MCU.
Background technology
The source of welding current is a kind of device that electric energy is provided for welding arc, and the heat that namely utilizes welding arc to produce melts welding rod and weldment, realizes the electrical equipment of welding process.In welding process, the resistance value of welding arc is changing always, and changes along with the variation of arc length, and when arc length increases, resistance is just large, otherwise resistance is just little.For meeting the needs of SMAW welding, generally welding rod arc welding electric power supply is had to following requirement: 1, suitable floating voltage: when Arc Welding Power, connect electrical network and output while there is no load, welding current is preferably zero.2, suitable short circuit current: in SMAW process, striking and droplet transfer etc. all can cause the short circuit phenomenon of welding circuit; Common regulation short circuit current equals 1.25～1.5 times of welding current.3, there is the external characteristics of suddenly falling: under stable state, between the welding current of the output of Arc Welding Power and output voltage, preferably there is the external characteristics of suddenly falling to improve the stability of electric arc.4, good dynamic characteristic: in welding process, the load of welding machine is always constantly changing, between welding rod and weldment, can be short-circuited frequently and striking again, when welding rod lifts, the source of welding current will reach floating voltage very soon, if the output current of welding machine and voltage can not promptly adapt to these variations in welding arc process, electric arc just can not even extinguish in stable burning; Conventionally assigned voltage is not more than 0.05s turnaround time, makes electric arc softness, calmness, high resilience in welding process, easy arc striking, and welding process is stablized, splashes little.
In order to guarantee the safe and reliable low work of the source of welding current, the SECO in the time of need to realizing the abnormal conditions processing of the upper electro-detection of power supply and initialization, the course of work and shutdown or power down suddenly for the source of welding current of welding machine.Traditional welding machine is realized the circuit that these functions need more complicated, and in time accuracy and repeatability, there is certain deviation, along with Microprogrammed Control Unit(is hereinafter to be referred as MCU) extensive use, therefore be necessary to provide the welding supply based on MCU to realize the digitlization of controlling, and further improve reliability and the control accuracy of the source of welding current.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of welding supply based on MCU, not only can significantly promote the reliability of power supply, and simplifies circuit structure, improves control accuracy.
The utility model is to solve the problems of the technologies described above the technical scheme adopting to be to provide a kind of welding supply based on MCU, comprise MCU module, the input end of analog signal of described MCU module is connected with temperature measuring equipment with line voltage input module, source of welding current electric current output module, source of welding current Voltage-output module respectively; The switching signal input of described MCU module is connected with source of welding current abnormal signal module; An output of the described MCU module output pulse width modulation signal that is connected with PWM module, another output output on off control signal that is connected with blower fan.
The above-mentioned welding supply based on MCU, wherein, described temperature measuring equipment is temperature sensor.
The above-mentioned welding supply based on MCU, wherein, described temperature sensor comprise the first temperature sensor for measuring IGBT temperature, for measuring the second temperature sensor of intermediate-frequency transformer coil temperature and for measuring the three-temperature sensor of fast recovery pipe temperature.
The above-mentioned welding supply based on MCU, wherein, the measurement category of described the first temperature sensor and the second temperature sensor is 30～80 ℃.
The above-mentioned welding supply based on MCU, wherein, the measurement category of described three-temperature sensor is 60～140 ℃.
The above-mentioned welding supply based on MCU, wherein, described temperature measuring equipment is thermistor.
The above-mentioned welding supply based on MCU, wherein, described thermistor is arranged on the casing of welding machine.
The above-mentioned welding supply based on MCU, wherein, described PWM module is by IGBT module drive, and described thermistor is attached on the radiator of IGBT module.
The above-mentioned welding supply based on MCU, wherein, is provided with intermediate-frequency transformer between described line voltage input module and source of welding current electric current output module, and described thermistor is arranged on intermediate-frequency transformer coil.
The above-mentioned welding supply based on MCU, wherein, described source of welding current abnormal signal module comprises over-current signal, heat alarm, overvoltage/undervoltage signal and/or exceedes rated power abnormal signal.
The utility model contrast prior art has following beneficial effect: the welding supply based on MCU that the utility model provides; by signals such as MCU module real-time inspection line voltage and intermediate-frequency transformer primary current voltages; utilize temperature measuring equipment to detect the temperature of key components; and carry out overtemperature protection by controlling blower fan start and stop; there is stopping fast when abnormal the work of machine; thereby significantly promote the reliability of the source of welding current, and simplify circuit structure, improve control accuracy.
Accompanying drawing explanation
Fig. 1 is the welding supply hardware block schematic diagram of the utility model based on MCU;
Fig. 2 is the utility model source of welding current electrifying timing sequence control flow chart;
Fig. 3 is the utility model source of welding current work schedule control flow chart;
Fig. 4 is the utility model source of welding current shutdown SECO flow chart;
Fig. 5 is the hardware circuit schematic diagram that in the utility model Intelligent welding supply unit, temperature transition becomes voltage;
Fig. 6 is overtemperature protection control flow schematic diagram after the utility model welding supply employing thermistor.
In figure:
1MCU module 2 line voltage input module 3 source of welding current electric current output modules
4 source of welding current Voltage-output module 5 temperature measuring equipment 6 source of welding current abnormal signal modules
The specific embodiment
Below in conjunction with drawings and Examples, the utility model will be further described.
Fig. 1 is the welding supply hardware block schematic diagram of the utility model based on MCU.
Refer to Fig. 1, the welding supply based on MCU that the utility model provides comprises MCU module 1, and the input end of analog signal of described MCU module 1 is connected with temperature measuring equipment 5 with line voltage input module 2, source of welding current electric current output module 3, source of welding current Voltage-output module 4 respectively; The switching signal input of described MCU module 1 is connected with source of welding current abnormal signal module 6; An output of the described MCU module 1 output pulse width modulation signal that is connected with PWM module 7, another output output on off control signal that is connected with blower fan 8.
The welding supply based on MCU that the utility model provides; by signals such as MCU module 1 real-time inspection line voltage and intermediate-frequency transformer primary current voltages; utilize the temperature of temperature measuring equipment 5 key componentses; and carry out overtemperature protection by controlling blower fan 8 start and stop; there is stopping fast when abnormal the work of machine; thereby significantly promote the reliability of power supply, and simplify circuit structure, improve control accuracy.Temperature measuring equipment 5 generally can be selected temperature sensor, and concrete conversion connects as follows: the analog-to-digital conversion passage AD0 that 1, the voltage signal of line voltage input module 2 is input to MCU; 2, the output current of the source of welding current and output voltage are changed into AD3, the AD4 passage that voltage signal is input to MCU by hardware circuit.3, by the temperature of the inner key components of the source of welding current, for measuring the first temperature sensor of IGBT temperature and being input to AD1, the AD2 passage of MCU for measuring the signal of the second temperature sensor of intermediate-frequency transformer coil temperature, the measurement category of described the first temperature sensor and the second temperature sensor is roughly 30～80 ℃, detected temperatures reaches 50～60 ℃ of machines 8 that blow in, and reaches 80 ℃ of shutdown; Certainly also can increase for measuring three-temperature sensor of fast recovery pipe temperature etc. as required, the measurement category of described three-temperature sensor is 60～140 ℃, reaches 140 ℃ of shutdown.4, source of welding current abnormal signal is changed into height (about 3.3V) low (about 0V) level and is input to the I/O port (hereinafter to be referred as I/O mouth) of MCU by hardware circuit, as over-current signal, heat alarm, overvoltage/undervoltage signal and/or exceed the abnormal signals such as rated power.5, with the startup of the parts such as the pulsewidth modulation (hereinafter to be referred as PWM) of the I/O mouth control source of welding current of MCU module, blower fan 8 with stop.
Fig. 2 is the utility model source of welding current electrifying timing sequence control flow chart.
Please continue referring to Fig. 2, the start process of the welding supply that the utility model provides is as follows: after the source of welding current powers on, first by line voltage input module 2, check whether normal net presses, if the normal relay of adhesive main power source again, after postponing a period of time, start PWM module 7, enter normal operating conditions.
Fig. 3 is the utility model source of welding current work schedule control flow chart.
Please continue referring to Fig. 3, the course of work of the welding supply that the utility model provides is as follows: in work, need periodically to check the signal such as temperature, intermediate-frequency transformer primary current of line voltage, key components in engineering, occur when abnormal, need stop fast the work of machine, enter abnormal protection state, and wait for its recovery;
Fig. 4 is the utility model source of welding current shutdown SECO flow chart.
Please continue referring to Fig. 4, the shutdown process of the welding supply that the utility model provides is as follows: detect after off signal, need to first close PWM module 7, cut off again the relay of main power source after postponing some times, open blower fan 8 remaining energy on power supply is discharged complete.
Except temperature sensor, the utility model also can adopt thermistor directly to realize overheat protective function as temperature measuring equipment, described thermistor is preferably mounted on the casing of welding machine and key components position, as thermistor being attached on the radiator of the IGBT module that drives PWM module 7; Or be arranged on the intermediate-frequency transformer coil arranging between line voltage input module 2 and source of welding current electric current output module 3; Then by hardware circuit, the temperature transition of these positions is become to voltage signal, be connected to the analog-to-digital conversion mouth (hereinafter to be referred as AD mouth) of MCU, conversion circuit converts the temperature on casing to a resistance value by NTC as shown in Figure 5, by divider resistance R, Rp, capacitor C filtering converts the analog-to-digital conversion mouth (AD mouth) that a magnitude of voltage is input to chip to later again.According to the data that obtain on the AD mouth of MCU module 1, according to different environment temperatures, can make corresponding adjustment to each heat protection temperature spot, the service efficiency of welding machine is improved greatly, and strengthen reliability and the service life of welding.
Fig. 6 is overtemperature protection control flow schematic diagram after the utility model welding supply employing thermistor.
Please continue referring to Fig. 6, after the utility model welding supply adopts thermistor, overtemperature protection control flow is as follows: 1, after welding machine powers on, the AD mouth of MCU module 1 is testing environment temperature (relying on the NTC on casing) first, then according to environment temperature, recall the temperature protection point being applicable under this environment temperature; 2, then utilize the AD mouth of MCU periodically to read the temperature of key components position, when higher than protection temperature spot, order welding machine quits work, and heat outputting protection index signal.
Although the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; not departing from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (10)
1. the welding supply based on MCU, it is characterized in that, comprise MCU module (1), the input end of analog signal of described MCU module (1) is connected with line voltage input module (2), source of welding current electric current output module (3), source of welding current Voltage-output module (4) and temperature measuring equipment (5) respectively; The switching signal input of described MCU module (1) is connected with source of welding current abnormal signal module (6); An output of described MCU module (1) the output pulse width modulation signal that is connected with PWM module (7), another output output on off control signal that is connected with blower fan (8).
2. the welding supply based on MCU as claimed in claim 1, is characterized in that, described temperature measuring equipment (5) is temperature sensor.
3. the welding supply based on MCU as claimed in claim 2, it is characterized in that, described temperature sensor comprises the first temperature sensor for measuring IGBT temperature, for measuring the second temperature sensor of intermediate-frequency transformer coil temperature and for measuring the three-temperature sensor of fast recovery pipe temperature.
4. the welding supply based on MCU as claimed in claim 3, is characterized in that, the measurement category of described the first temperature sensor and the second temperature sensor is 30～80 ℃.
5. the welding supply based on MCU as claimed in claim 3, is characterized in that, the measurement category of described three-temperature sensor is 60～140 ℃.
6. the welding supply based on MCU as claimed in claim 1, is characterized in that, described temperature measuring equipment (5) is thermistor.
7. the welding supply based on MCU as claimed in claim 6, is characterized in that, described thermistor is arranged on the casing of welding machine.
8. the welding supply based on MCU as claimed in claim 6, is characterized in that, described PWM module (7) is by IGBT module drive, and described thermistor (5) is attached on the radiator of IGBT module.
9. the welding supply based on MCU as claimed in claim 6, it is characterized in that, between described line voltage input module (2) and source of welding current electric current output module (3), be provided with intermediate-frequency transformer, described thermistor (5) is arranged on intermediate-frequency transformer coil.
10. the welding supply based on MCU as described in claim 1～9 any one, is characterized in that, described source of welding current abnormal signal module (6) comprises over-current signal, heat alarm, overvoltage/undervoltage signal and/or exceedes rated power abnormal signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320614896.3U CN203541812U (en) | 2013-09-30 | 2013-09-30 | MCU (microprogrammed control unit)-based welding power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320614896.3U CN203541812U (en) | 2013-09-30 | 2013-09-30 | MCU (microprogrammed control unit)-based welding power device |
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| Publication Number | Publication Date |
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| CN203541812U true CN203541812U (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320614896.3U Expired - Fee Related CN203541812U (en) | 2013-09-30 | 2013-09-30 | MCU (microprogrammed control unit)-based welding power device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209622A (en) * | 2014-09-20 | 2014-12-17 | 庄景阳 | Cooling device of induction electric soldering iron welding piece |
| CN107584192A (en) * | 2016-07-07 | 2018-01-16 | 上海沪工焊接集团股份有限公司 | Electric welding machine method for excessive heating protection |
| CN112108743A (en) * | 2020-08-27 | 2020-12-22 | 上海沪工焊接集团股份有限公司 | Thermal protection control method for controlling internal temperature of arc welding power supply |
-
2013
- 2013-09-30 CN CN201320614896.3U patent/CN203541812U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104209622A (en) * | 2014-09-20 | 2014-12-17 | 庄景阳 | Cooling device of induction electric soldering iron welding piece |
| CN107584192A (en) * | 2016-07-07 | 2018-01-16 | 上海沪工焊接集团股份有限公司 | Electric welding machine method for excessive heating protection |
| CN112108743A (en) * | 2020-08-27 | 2020-12-22 | 上海沪工焊接集团股份有限公司 | Thermal protection control method for controlling internal temperature of arc welding power supply |
| CN112108743B (en) * | 2020-08-27 | 2024-01-05 | 上海沪工焊接集团股份有限公司 | Thermal protection control method for controlling internal temperature of arc welding power supply |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20190930 |
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| CF01 | Termination of patent right due to non-payment of annual fee |