CN100589913C - High-frequency inversion arc-welding power supply main power system - Google Patents
High-frequency inversion arc-welding power supply main power system Download PDFInfo
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- CN100589913C CN100589913C CN200810106141A CN200810106141A CN100589913C CN 100589913 C CN100589913 C CN 100589913C CN 200810106141 A CN200810106141 A CN 200810106141A CN 200810106141 A CN200810106141 A CN 200810106141A CN 100589913 C CN100589913 C CN 100589913C
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- switching tube
- igbt
- tube igbt
- emitter stage
- colelctor electrode
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Abstract
The invention relates to a high frequency inversion arc welding main power system, belonging to the technical field of welding equipment and automation. The positive of the 540V voltage after rectification is connected with a collector Q1, and the negative is connected with an emitter Q4. Since Q1 to Q4 are connected in series on 540V voltage, and at most two IGBTs turn on at any time, the biggestbearing voltage of Q1 to Q4 is 270V. Since Q1, Q2, Q3 and Q4 are switched on in sequence, the biggest voltage between the two ends of C3 is 270V, and the biggest bearing voltage of Q5 to Q8 is also 270V, which reduces the biggest bearing voltage of IGBT to half of the biggest bearing voltage of IGBT in the traditional full-bridge arc welding power successfully. The switch tubes Q5 to Q8 conduct frontier adjustment, and Q1 to Q8 play different roles of soft switch via the clamping action of the capacitor C3, the diodes D2 and D3, thus further reducing the hot loss of the switch tubes.
Description
Technical field
The present invention relates to a kind of high-frequency inversion arc-welding power supply main power system, belong to welding equipment and automatic field.
Background technology
At present, domestic most arc welding inverter adopts full-bridge type IGBT inverter structure, its structure as shown in Figure 1, switching tube IGBTQ
1, Q
4And Q
2, Q
3Conducting by turns, in traditional full-bridge topologies, the voltage that each IGBT bears is 540V, so switching tube IGBT generally selects the module (the module volume is bigger) of 1200V for use, the voltage that IGBT bears is high more, and it is high more then to open, turn-off the loss that constantly causes, therefore the frequency of IGBT is restricted about 20KHz in common full-bridge Arc Welding Power, if continue to improve frequency, can cause the IGBT heating serious, thereby cause serious consequence.Therefore, high-power, the small size of development, high performance contravariant arc welding power source are still the target that people constantly make great efforts and pursue.
The application of three-level converter in the power electronics DC converter more and more widely become an important method that solves small size and high-power converter.The primary and foremost purpose of three-level DC converter is in order to reduce the voltage stress of switching tube, reduce output inductor simultaneously, the value of electric capacity, thereby reduce the volume of converter, improve the operating frequency of inverter, along with the develop rapidly of soft switch technique, become the hot issue of research in conjunction with the three-level converter of soft switch technique.
Summary of the invention
The object of the invention has been to overcome the above-mentioned defective of existing arc welding inverter, and a kind of three level digital contravariant arc welding power sources are provided.The main power system of this power supply adopts and flies the type of striding three level topological structure cascade full-bridge topologies.Pressure drop on this topological structure on the switching tube IGBT is half of the pressure drop on the switching tube IGBT on the traditional full-bridge topologies, greatly reduce switching loss, simultaneously can choose the lower IGBT of withstand voltage, be the further operating frequency that improves Arc Welding Power, thereby lay the first stone for improving output accuracy and reducing cost.
To achieve these goals, the present invention has taked following technical scheme.Include eight switching tube IGBT, eight switching tube IGBT have grid, emission collection and colelctor electrode respectively.Wherein: the galvanic positive termination first switching tube IGBT Q of the 540V after the rectification
1Colelctor electrode, negative terminal meets the 4th switching tube IGBT Q
4Emitter stage; First resistance R
1With second resistance R
2Series connection is between the 540V direct current after the rectification; First capacitor C
1With second capacitor C
2Series connection is between the 540V direct current after the rectification; First resistance R
1With second resistance R
2The series connection point and first capacitor C
1With second capacitor C
2Series connection point link to each other, and with second switch pipe IGBT Q
2Emitter stage link to each other; The first switching tube IGBT Q
1Emitter stage and second switch pipe IGBT Q
2Colelctor electrode, the 5th switching tube IGBT Q
5Colelctor electrode and the 7th switching tube IGBT Q
7Colelctor electrode link to each other; Second switch pipe IGBT Q
2Emitter stage and the 3rd switching tube IGBT Q
3Colelctor electrode link to each other; The 3rd switching tube IGBT Q
3Emitter stage and the 4th switching tube IGBT Q
4Colelctor electrode, the 6th switching tube IGBT Q
6Emitter stage, the 8th switching tube IGBT Q
8Emitter stage link to each other; The 5th switching tube IGBT Q
5Emitter stage and the 6th switching tube IGBT Q
6Colelctor electrode link to each other the 7th switching tube IGBT Q
7Emitter stage and the 8th switching tube IGBT Q
8Colelctor electrode link to each other; The 3rd capacitor C
3Be connected second switch pipe IGBT Q
2Colelctor electrode and the 3rd switching tube IGBT Q
3Emitter stage between; Each switching tube IGBT is parallel with a diode, and the anode of diode links to each other with the emitter stage of switching tube IGBT, and diode cathode links to each other with the colelctor electrode of switching tube IGBT; Grid, emitter stage on eight switching tube IGBT are received respectively on the IGBT drive circuit; The two ends of driving transformer primary coil meet the 5th switching tube IGBT Q respectively
5Emitter stage and the 7th switching tube IGBT Q
7Emitter stage.
Operation principle of the present invention and process:
1) Q
1, Q
3And Q
2, Q
4Conducting simultaneously in turn, and guarantee conducting in maximum pulse width (Dead Time is 2 μ s), so just do not need switching tube Q
1-Q
4Carry out the pulsewidth medical treatment.
2) allow switching tube Q
5-Q
8Press full-bridge mode work, as switching tube Q
1, Q
3Conducting is controlled Q constantly
5, Q
8ON time; As switching tube Q
2, Q
4Conducting is controlled Q constantly
6, Q
7ON time, thereby output voltage is regulated.
3) switching tube Q
5-Q
8Carry out the forward position and regulate, allow Q
5, Q
8Compare Q
1, Q
3Time delay T
1=1 μ s turn-offs; Q
6, Q
7Compare Q
2, Q
4Time delay T
1=1 μ s turn-offs, and passes through capacitor C like this
3, diode D
2, D
3Clamping action, allow Q
1-Q
8Play the soft on-off action of different-effect respectively.
4) single-chip microcomputer sample rate current, sampled voltage, given electric current be converted into digital quantity for the analog quantity of point voltage, according to the sum of errors error rate of feedback, is selected suitable PI parameter by the A/D module in real time, carries out PI and calculates, and reaches the purpose of adjusting.
Compared with prior art, patent of the present invention has the following advantages:
1) because Q
1～Q
4Be connected between the 540V voltage, and two IGBT of maximum maintenances of any moment are open-minded, so Q
1～Q
4Maximum to bear voltage be 270V because Q
1, Q
3And Q
2, Q
4So conducting in turn is C
3The two ends maximum voltage is 270V, Q
5～Q
8On maximum bear voltage also for 270V, successfully the highest voltage that bears of IGBT is reduced to the highest half of voltage of bearing of IGBT on traditional full-bridge Arc Welding Power, reduced the thermal losses of switching tube effectively, thereby the operating frequency of contravariant arc welding power source significantly reaches the purpose of the output accuracy that improves power supply.
2) clamping capacitance C
3, sustained diode
2, D
3Play certain soft on-off action, further reduce the shutoff on the IGBT and open pressure drop.
3) by improving the frequency of inverter, can reduce the volume of transformer, reactor, thereby reduce cost.
Description of drawings
The full-bridge master power topological structure block diagram that Fig. 1 is traditional
Fig. 2 system block diagram of the present invention
The main power topological structure block diagram of Fig. 3 three level digital contravariant arc welding power sources
The switching tube work schedule of Fig. 4 three level digital contravariant arc welding power sources and the voltage on the switching tube
The main circuit mode of operation of Fig. 5 three level digital contravariant arc welding power sources
The specific embodiment
The invention will be further described below in conjunction with Fig. 1～Fig. 5.
Native system includes main power circuit B, current detection circuit C, voltage detecting circuit D, numerical control system E, holding circuit F and the IGBT drive circuit G of three phase rectifier filter circuit A, three level digital contravariant arc welding power sources.Wherein, main power circuit B adopts to fly the type of striding three level topological structure cascade full-bridge topologies, in the main power structure, and Q
1～Q
8Be the IGBT that has grid, emission collection and colelctor electrode respectively.Wherein, the galvanic positive termination Q of 540V after the three phase rectifier filter circuit A rectification
1Colelctor electrode, negative terminal meets IGBTQ
4Emitter stage.First resistance R
1With second resistance R
2Series connection between the 540V direct current after the rectification, first capacitor C
1With second capacitor C
2Series connection is between the 540V direct current after the rectification.First resistance R
1With second resistance R
2The series connection point and first capacitor C
1With second capacitor C
2Series connection point links to each other, and with second switch pipe IGBT Q
2The emitter stage phase.The first switching tube IGBT Q
1Emitter stage and second switch pipe IGBTQ
2Colelctor electrode, the 5th switching tube IGBT Q
5Colelctor electrode and the 7th switching tube IGBT Q
7Colelctor electrode link to each other.Second switch pipe IGBT Q
2Emitter stage and the 3rd switching tube IGBT Q
3Colelctor electrode link to each other.The 3rd switching tube IGBT Q
3Emitter stage and the 4th switching tube IGBT Q
4Colelctor electrode, the 6th switching tube IGBT Q
6Emitter stage, the 8th switching tube IGBT Q
8Emitter stage link to each other.The 5th switching tube IGBT Q
5Emitter stage and the 6th switching tube IGBT Q
6Colelctor electrode link to each other the 7th switching tube IGBT Q
7Emitter stage and the 8th switching tube IGBT Q
8Colelctor electrode link to each other.The 3rd capacitor C
3Be connected second switch pipe IGBT Q
2Colelctor electrode and the 3rd switching tube IGBT Q
3Emitter stage between.Diode D
1～D
8Be connected in parallel on switching tube IGBTQ respectively
1～Q
8Above, the anode of diode links to each other with the emitter stage of IGBT, and negative electrode links to each other with the colelctor electrode of IGBT.Q
1-Q
8On grid, emitter stage receive respectively on the IGBT drive circuit, grid and emitter stage connect drive pulse signal.The elementary two ends of driving transformer meet the 5th switching tube IGBT Q respectively
5Emitter stage and the 7th switching tube IGBT Q
7Emitter stage, current detection circuit C, voltage detecting circuit D link to each other with numerical control system E respectively with holding circuit F; Drive circuit G is connected with the main power circuit B of three level digital contravariant arc welding power sources.
The input voltage of three phase rectifier filter circuit A is the three-phase alternating current of 380V, through the AC-DC-AC conversion, changes into the power supply that the power supply welding machine uses.Fig. 3 is the main power topological structure of three level digital contravariant arc welding power sources, for analyzing its mode of operation, does following hypothesis earlier:
All switching tubes, diode, inductance, electric capacity all are desirable device in a, the circuit, are isolating under the situation of equivalent leakage inductance, and transformer is an ideal transformer also, establish former elementary, the secondary turns of transformer than being N;
B, inductance L
1Enough big, output current is continuous.Capacitor C
1, C
2Enough big, voltage is approximately constant on it, is U=270V, at this moment C
1, C
2Can be approximated to be voltage source;
C, establish capacitor C
3Size be C, the maximum output current of power supply is 400A.
Switch mode a[t
0-t
1]: at t
0Constantly, switching tube Q
1-Q
8All be in off state.t
0Constantly, switching tube Q
1, Q
3Conducting, current direction are C
1→ Q
1→ C
3→ Q
3→ C
1, give capacitor C
3T is worked as in charging
1Constantly, C
3On voltage reach 270V;
Switch mode a[t
2-t
3]: at t
2Constantly, switching tube Q
5, Q
8Conducting, current direction are C
1→ Q
1→ Q
5→ Q
8→ Q
3→ C
1, to the transformer secondary output power supply, elementary equivalent current size is I.This moment, the transformer original edge voltage is 270V, and secondary voltage is 270/N;
Switch mode a[t
3-t
4]: at t
3Constantly, switching tube Q
1, Q
3Turn-off, current direction is C
3→ Q
5→ Q
8→ C
3, power to transformer secondary output.Because capacitor C
3Discharge, capacitor C
3Voltage reduce U gradually
C3=270-I * (t-t
3)/C;
Switch mode a[t
4-t
5]: at t4 constantly, U
C3=270-I * (t
4-t
3)/C; Switching tube Q
5, Q
8Turn-off, owing to the primary electric current can not suddenly change, so current direction is C
3→ D
6→ D
7→ C
3, give capacitor C
3Charging.(T
1=t
4-t
3, be switching tube Q
5, Q
8Than switching tube Q
1, Q
3The delay turn-off time);
Switch mode a[t
6-t
7]: at t
6Constantly, switching tube Q
2, Q
4Conducting, current direction are C
2→ Q
2→ C
3→ Q
4→ C
2, give capacitor C
3T is worked as in charging
7Constantly, C
3On voltage reach 270V again;
Switch mode a[t
8-t
9]: at t
8Constantly, switching tube Q
6, Q
7Conducting, current direction are C
2→ Q
2→ Q
7→ Q
6→ Q
4→ C
2, to the transformer secondary output power supply, elementary equivalent current size is I.This moment, the transformer original edge voltage is-270V that secondary voltage is-270/N;
Switch mode a[t
9-t
10]: at t
9Constantly, switching tube Q
2, Q
4Turn-off, current direction is C
3→ Q
7→ Q
6→ C
3, power to transformer secondary output.Because capacitor C
3Discharge, capacitor C
3Voltage reduce U gradually
C3=270-I * (t-t
9)/C;
Switch mode a[t
10-t
11]: at t
10Constantly, U
C3=270-I * (t
10-t
9)/C; Switching tube Q
7, Q
6Turn-off, owing to the primary electric current can not suddenly change, so current direction is C
3→ D
8→ D
5→ C
3, give capacitor C
3Charging.(T
1=t
10-t
9, be switching tube Q
7, Q
6Than switching tube Q
2, Q
4The delay turn-off time);
Claims (1)
1. high-frequency inversion arc-welding power supply main power system is characterized in that: include eight switching tube IGBT, eight switching tube IGBT have grid, emission collection and colelctor electrode respectively; Wherein: the galvanic positive termination first switching tube IGBT (Q of the 540V after the rectification
1) colelctor electrode, negative terminal meets the 4th switching tube IGBT (Q
4) emitter stage; First resistance (the R
1) and the second resistance (R
2) series connection is between the 540V direct current after the rectification; First electric capacity (the C
1) and the second electric capacity (C
2) series connection is between the 540V direct current after the rectification; First resistance (the R
1) and the second resistance (R
2) the series connection point and the first electric capacity (C
1) and the second electric capacity (C
2) series connection point link to each other, and with second switch pipe IGBT (Q
2) emitter stage link to each other; The first switching tube IGBT (Q
1) emitter stage and second switch pipe IGBT (Q
2) colelctor electrode, the 5th switching tube IGBT (Q
5) colelctor electrode and the 7th switching tube IGBT (Q
7) colelctor electrode link to each other; Second switch pipe IGBT (Q
2) emitter stage and the 3rd switching tube IGBT (Q
3) colelctor electrode link to each other; The 3rd switching tube IGBT (Q
3) emitter stage and the 4th switching tube IGBT (Q
4) colelctor electrode, the 6th switching tube IGBT (Q
6) emitter stage, the 8th switching tube IGBT (Q
8) emitter stage link to each other; The 5th switching tube IGBT (Q
5) emitter stage and the 6th switching tube IGBT (Q
6) colelctor electrode link to each other the 7th switching tube IGBT (Q
7) emitter stage and the 8th switching tube IGBT (Q
8) colelctor electrode link to each other; The 3rd electric capacity (C
3) be connected second switch pipe IGBT (Q
2) colelctor electrode and the 3rd switching tube IGBT (Q
3) emitter stage between; Each switching tube IGBT is parallel with a diode, and the anode of diode links to each other with the emitter stage of switching tube IGBT, and diode cathode links to each other with the colelctor electrode of switching tube IGBT; Grid, emitter stage on eight switching tube IGBT are received respectively on the IGBT drive circuit; The two ends of driving transformer primary coil meet the 5th switching tube IGBT (Q respectively
5) emitter stage and the 7th switching tube IGBT (Q
7) emitter stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810106141A CN100589913C (en) | 2008-05-09 | 2008-05-09 | High-frequency inversion arc-welding power supply main power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810106141A CN100589913C (en) | 2008-05-09 | 2008-05-09 | High-frequency inversion arc-welding power supply main power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101264546A CN101264546A (en) | 2008-09-17 |
| CN100589913C true CN100589913C (en) | 2010-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810106141A Ceased CN100589913C (en) | 2008-05-09 | 2008-05-09 | High-frequency inversion arc-welding power supply main power system |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101412140B (en) * | 2008-11-17 | 2011-06-01 | 江苏科技大学 | Zero-voltage soft switch topological main circuit of arc welding inverter |
| CN101628356B (en) * | 2009-08-06 | 2012-05-30 | 唐山松下产业机器有限公司 | Soft-switching inversion welder |
| CN102769399B (en) * | 2012-06-29 | 2015-02-18 | 阳光电源（上海）有限公司 | Single-phase half-bridge three-level inverter circuit and inverter |
| CN104779808A (en) * | 2015-04-26 | 2015-07-15 | 中国计量学院 | Variable switch capacitive type AC-AC convertor achieving 1/2 n no-load voltage ratio |
| DE102016222001A1 (en) * | 2016-11-09 | 2018-05-09 | Vincotech Gmbh | ACTIVE THREE-LEVEL NPC MOVEMENT MODULE |
| CN108462399A (en) * | 2018-01-11 | 2018-08-28 | 浙江大学 | A kind of high efficiency rectifier |
-
2008
- 2008-05-09 CN CN200810106141A patent/CN100589913C/en not_active Ceased
Non-Patent Citations (4)
| Title |
|---|
| 一种基于空间矢量调制的弧焊逆变电源PFC控制方法. 黄继强，陈树君，王冬平，殷树言.焊接学报，第24卷第3期. 2003 |
| 一种基于空间矢量调制的弧焊逆变电源PFC控制方法. 黄继强，陈树君，王冬平，殷树言.焊接学报，第24卷第3期. 2003 * |
| 基于PWM整流器的弧焊逆变电源的PFC技术. 黄继强，陈树君，王冬平，殷树言.电力电子技术，第37卷第2期. 2003 |
| 基于PWM整流器的弧焊逆变电源的PFC技术. 黄继强，陈树君，王冬平，殷树言.电力电子技术，第37卷第2期. 2003 * |
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| CN101264546A (en) | 2008-09-17 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuxi Zhouxiang Complete Set of Welding Equipment Co., Ltd. Assignor: Beijing University of Technology Contract record no.: 2010320000461 Denomination of invention: High-frequency inversion arc-welding power supply main power system Granted publication date: 20100217 License type: Exclusive License Open date: 20080917 Record date: 20100426 |
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| C35 | Partial or whole invalidation of patent or utility model | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20110518 Decision number of declaring invalidation: 16524 Granted publication date: 20100217 |