CN100460122C - Super speed inverting pole-changing square wave current arc-welding power supply device - Google Patents
Super speed inverting pole-changing square wave current arc-welding power supply device Download PDFInfo
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- CN100460122C CN100460122C CNB2007101208331A CN200710120833A CN100460122C CN 100460122 C CN100460122 C CN 100460122C CN B2007101208331 A CNB2007101208331 A CN B2007101208331A CN 200710120833 A CN200710120833 A CN 200710120833A CN 100460122 C CN100460122 C CN 100460122C
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- switch pipe
- power supply
- power switch
- power
- current
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Abstract
The present invention discloses a super rapid exchanging polarity changing square wave current arc welding power supply device used for electric arc welding, which comprise a DC power supply, a full bridge transfer circuit, a drive circuit, a control system, a parallel absorbing protecting circuit and an assistant DC power supply. The parallel absorbing protecting circuit consists of a power diode D, an electrolytic condenser CE, a high frequency capacitance C and a power resistor R. For the power supply of the present invention, through connecting a follow current inductance L between the DC power supply and the full bridge transfer circuit, and synchronously increasing the power diode D, the electrolytic condenser CE, the high frequency capacitance C, the power resistor R and the assistant DC power supply, the follow current inductance L ensures the output current having rapid current ascension rate and the current descending rate respectively not less than 50A/Mus by using the characteristic that: the current flowing can not suddenly exchange, and transfer frequency of the output polarity square wave is 1Hz to 20 kHz, and the positive conducting time ratio is 10 percent to 90 percent, and the current amplitude value of the positive and negative half wave is 5 to 400 A.
Description
Technical field
The present invention relates to a kind of supply unit that is applicable to arc welding, more particularly say, being meant a kind of have current-rising-rate and rate of descent fast, output Variable Polarity Square-wave AC power frequency can reach 〉=super speed inverting pole-changing square wave current arc-welding power supply device of 20kHz (superaudio).
Background technology
Variable polarity welding power supply is the novel source of welding current of a kind of alternative sine wave AC and square wave alternating-current power supply, and it is mainly used in argon tungsten-arc welding and plasma arc welding (PAW) etc.In fact the Variable Polarity power supply is exactly the square wave alternating-current power supply that a kind of power frequency and positive and negative half-wave current amplitude, time ratio can be distinguished independent regulation, and conventional Variable Polarity power supply architecture as shown in Figure 2.Because the characteristics in the power supply architecture design, conventional Variable Polarity electric power outputting current is when positive and negative reversal, current-rising-rate and rate of descent be (conventional high frequency Variable Polarity Square-wave AC electric current maximum climbing and rate of descent are respectively＜5A/ μ s) comparatively slowly, and exist certain zero passage Dead Time, be only applicable under the lower frequency condition, work.Variable Polarity power supply output Variable Polarity power frequency commonly used is all in the hundreds of hertz, why like this, mainly be because conventional Variable Polarity power supply all adopts the conventional bridge circuit, in order to guarantee the trouble free service of bridge circuit, be parallel with capacitor C at the bridge circuit two ends, although capacitor C can prevent to produce high pressure at the device for power switching two ends, two subject matters have also been brought simultaneously: one, the first power switch pipe T
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4Switch respectively when realizing the output of Variable Polarity electric current, certain Dead Time must be set, otherwise will be by the capacitor C and the first power switch pipe T
1, the second power switch pipe T
2Or capacitor C and the 3rd power switch pipe T
3, the 4th power switch pipe T
4Common conducting forms short circuit, thereby might cause the damage of device for power switching.They are two years old, because the existence of shunt capacitance C, when carrying out the current polarity switching, the climbing of electric current and rate of descent when capacitor C will suppress the current polarity conversion, this also is that conventional Variable Polarity power supply can not be operated in upper frequency, and owing to the existence of Dead Time makes current over-zero easily cause electric arc easily to extinguish and unsettled reason when changing.
Summary of the invention
A kind of super speed inverting pole-changing square wave current arc-welding power supply device provided by the invention by being connected the afterflow inductance L between dc source and the full-bridge circuit, increases power diode D, electrochemical capacitor C at the two ends of full-bridge circuit simultaneously
E, high frequency capacitance C, power resistor R and auxiliary DC power supply.Supply unit of the present invention is intended to solve that conventional Variable Polarity Square-wave AC power supply output Variable Polarity current work frequency is lower, current-rising-rate and rate of descent problem slowly during the current polarity conversion.
The present invention is a kind of super speed inverting pole-changing square wave current arc-welding power supply device; between the positive pole of dc source and negative pole, be parallel with full-bridge circuit; between auxiliary DC power supply positive pole and negative pole, be parallel with absorption holding circuit in parallel, be connected with afterflow inductance L, power diode D at dc power anode and auxiliary DC power supply positive pole.The described holding circuit that absorbs in parallel is by power diode D, electrochemical capacitor C
E, high frequency capacitance C and power resistor R form, it has guaranteed the first power switch pipe T reliably
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The operate as normal of circuit when high frequency reversal.
Super speed inverting pole-changing square wave current arc-welding power supply of the present invention has realized that electric current does not have the high frequency polarity conversion of Dead Time, having ultrafast current-rising-rate and rate of descent simultaneously is respectively 〉=50A/ μ s, output Variable Polarity Square-wave AC current transformation frequency 1Hz～20kHz, forward conduction time ratio 10%～90%, positive and negative half-wave current amplitude 5～400A.
The advantage of super speed inverting pole-changing square wave current arc-welding power supply of the present invention is: (1) adopts a kind of novel topological structure based on full-bridge circuit, absorption holding circuit in parallel, realizes the output of high frequency Variable Polarity Square-wave AC electric current; (2) adopt dsp processor generate two-way have adjustable first overlapping time t
HWith second overlapping time t
LThe first driving pulse sequence U
1, the second driving pulse sequence U
2, and two-way pulse train acted on the full-bridge circuit, make high frequency Variable Polarity Square-wave AC electric current not have the dead band zero-crossing timing; (3) fast conversion high frequency Variable Polarity Square-wave AC current-rising-rate and rate of descent be respectively 〉=50A/ μ s (conventional high frequency Variable Polarity Square-wave AC electric current maximum climbing and rate of descent be respectively＜5A/ μ s about, the present invention has improved at least 10 times with respect to the output of conventional high frequency Variable Polarity Square-wave AC electric current, so be called ultrafast conversion), output Variable Polarity Square-wave AC current transformation frequency 1Hz～20kHz, forward conduction time ratio 10%～90%, positive and negative half-wave current amplitude 5～400A.
Description of drawings
Fig. 1 is the structured flowchart of the supper-fast Variable Polarity Square-wave AC Arc Welding Power of the present invention.
Fig. 2 is the structured flowchart of conventional Variable Polarity Arc Welding Power.
Fig. 3 adopts dsp system to produce the overlapped driving pulse sequence of two-way.
The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
See also shown in Figure 1ly, the present invention is a kind of super speed inverting pole-changing square wave current arc-welding power supply device, is parallel with full-bridge circuit between the positive pole of dc source and negative pole, is parallel with absorption holding circuit in parallel between auxiliary DC power supply positive pole and negative pole.The described holding circuit that absorbs in parallel is by power diode D, electrochemical capacitor C
E, high frequency capacitance C and power resistor R form, it has guaranteed the first power switch pipe T reliably
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The operate as normal of circuit when high frequency reversal.Be connected with afterflow inductance L, power diode D at dc power anode and auxiliary DC power supply positive pole.The connection of each electronic device of supply unit of the present invention is: the positive pole of dc source is connected with 1 end of afterflow inductance L, 2 ends of afterflow inductance L respectively with the first power switch pipe T
1Colelctor electrode C, the 3rd power switch pipe T
3The anode of colelctor electrode C, power diode D connect, the negative electrode of power diode D is connected with the positive pole of auxiliary DC power supply; The negative pole of dc source respectively with the second power switch pipe T
2Emitter E, the 4th power switch pipe T
4The negative pole of emitter E, auxiliary DC power supply connect; The first power switch pipe T
1The emitter E and the second power switch pipe T
2Colelctor electrode C connect the 3rd power switch pipe T
3Emitter E and the 4th power switch pipe T
4Colelctor electrode C connect; Electrode is connected the 3rd power switch pipe T
3Emitter E and the 4th power switch pipe T
4Colelctor electrode C between, workpiece is connected the first power switch pipe T
1The emitter E and the second power switch pipe T
2Colelctor electrode C between.The present invention increases the afterflow inductance L, removes capacitor C as shown in Figure 2, has realized that electric current does not have the high frequency reversal of Dead Time, has ultrafast current-rising-rate and rate of descent simultaneously; Auxiliary DC power supply and power diode D, electrochemical capacitor C
E, the parallel connection formed of high frequency capacitance C and power resistor R absorbs holding circuit and guaranteed the first power switch pipe T reliably
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The operate as normal of circuit when high frequency reversal.
In the full-bridge circuit of the present invention, the first power switch pipe T
1, the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The driving pulse sequence generate by dsp processor chip in the control system.Control system can produce two-way have adjustable first overlapping time t
HWith second overlapping time t
LThe first driving pulse sequence U
1, the second driving pulse sequence U
2, the first driving pulse sequence U
1Offer the first power switch pipe T respectively
1, the 4th power switch pipe T
4, the second driving pulse sequence U
2Offer the second power switch pipe T respectively
2, the 3rd power switch pipe T
3(be the first driving pulse sequence U that the DSP control system produces
1Behind drive circuit, act on the first power switch pipe T
1Grid G and the 4th power switch pipe T
4Grid G on, the second driving pulse sequence U that the DSP control system produces
2Behind drive circuit, act on the second power switch pipe T
2Grid G and the 3rd power switch pipe T
3Grid G on.), as shown in Figure 3, the first power switch pipe T
1, the second power switch pipe T
2With the 3rd power switch pipe T
3, the 4th power switch pipe T
4Can exist certain common ON time (promptly first overlapping time t
HWith second overlapping time t
L, by the dsp processor chip regulate can make first overlapping time t
HWith second overlapping time t
LBe set to a desired value, as about 1 μ s), thus can realize that output current does not have the quick zero passage in dead band when reversal.The characteristic that the electric current on it can not suddenly change is flow through in the utilization of afterflow inductance L among the present invention, (fast conversion high frequency Variable Polarity Square-wave AC current-rising-rate and rate of descent are respectively 〉=50A/ μ s to guarantee to have fast current-rising-rate and electric current rate of descent by output current when reversal, output Variable Polarity Square-wave AC current transformation frequency 1Hz～20kHz, forward conduction time ratio 10%～90%, positive and negative half-wave current amplitude 5～400A), auxiliary DC power supply guarantees electrochemical capacitor C
ERemain certain voltage levvl with high frequency capacitance C two ends, auxiliary DC power supply and power diode D and electrochemical capacitor C
E, the parallel connection formed of high frequency capacitance C and power resistor R absorbs holding circuit and can guarantee the first power switch pipe T reliably
1With the second power switch pipe T
2, the 3rd power switch pipe T
3With the 4th power switch pipe T
4The operate as normal of circuit when high frequency reversal.
The present invention adopts the supper-fast Variable Polarity Square-wave AC power circuit topology based on the full-bridge type conversion, be input as dc source (dc source output floating voltage 50～70V, output current 5～400A) is connected with full-bridge circuit by the afterflow inductance L, by power diode D and electrochemical capacitor C
E, (auxiliary DC power supply output voltage 300～600V, output current 0.1～5A) is connected for high frequency capacitance C, power resistor R and auxiliary DC power supply.The purpose that increases the afterflow inductance L is in order to make dc source can obtain better outputting current steadily, simultaneously when output current polarity is switched, the characteristic that the electric current on the afterflow inductance L can not suddenly change is flow through in dependence, increases the climbing and the rate of descent of Variable Polarity Square-wave AC electric current.Full-bridge circuit is by power diode D and electrochemical capacitor C
E, high frequency capacitance C, power resistor R link to each other with auxiliary DC power supply and can avoid at the first power switch pipe T
1, the second power switch pipe T
2Common conducting and the 3rd power switch pipe T
3, the 4th power switch pipe T
4The harm that during common conducting power switch pipe is brought makes full-bridge circuit that Dead Time need not be set, and has accelerated the zero passage conversion time of Variable Polarity Square-wave AC electric current greatly, simultaneously electrochemical capacitor C
E, the capacitor array formed of high frequency capacitance C also has the absorption protective effect to the peak voltage of full-bridge circuit.In addition, since by auxiliary DC power supply to electrochemical capacitor C
E, high frequency capacitance C preset certain voltage, makes electrochemical capacitor C
E, the current-rising-rate when high frequency capacitance C can be with output current reversal and the retarding action of rate of descent be reduced to a lower level, further improved current-rising-rate and the rate of descent of output current when reversal.
Claims (5)
1. super speed inverting pole-changing square wave current arc-welding power supply device that is applicable to arc welding; comprise dc source, full-bridge circuit, drive circuit, control system; it is characterized in that: also comprise holding circuit and the auxiliary DC power supply of absorbing in parallel, the described holding circuit that absorbs in parallel is by power diode D, electrochemical capacitor C
E, high frequency capacitance C and power resistor R form; Between the positive pole of dc source and negative pole, be parallel with full-bridge circuit, between auxiliary DC power supply positive pole and negative pole, be parallel with absorption holding circuit in parallel, be connected with afterflow inductance L, power diode D at dc power anode and auxiliary DC power supply positive pole; The positive pole of dc source is connected with 1 end of afterflow inductance L, 2 ends of afterflow inductance L respectively with the first power switch pipe T
1Colelctor electrode C, the 3rd power switch pipe T
3The anode of colelctor electrode C, power diode D connect, the negative electrode of power diode D is connected with the positive pole of auxiliary DC power supply; The negative pole of dc source respectively with the second power switch pipe T
2Emitter E, the 4th power switch pipe T
4The negative pole of emitter E, auxiliary DC power supply connect; The first power switch pipe T
1The emitter E and the second power switch pipe T
2Colelctor electrode C connect the 3rd power switch pipe T
3Emitter E and the 4th power switch pipe T
4Colelctor electrode C connect; Electrode is connected the 3rd power switch pipe T
3Emitter E and the 4th power switch pipe T
4Colelctor electrode C between, workpiece is connected the first power switch pipe T
1The emitter E and the second power switch pipe T
2Colelctor electrode C between.
2. super speed inverting pole-changing square wave current arc-welding power supply device according to claim 1 is characterized in that: control system adopts the dsp processor chip, its produce two-way have first overlapping time t
HWith second overlapping time t
LThe first driving pulse sequence U
1, the second driving pulse sequence U
2, the first driving pulse sequence U
1Offer the first power switch pipe T respectively
1, the 4th power switch pipe T
4, the second driving pulse sequence U
2Offer the second power switch pipe T respectively
2, the 3rd power switch pipe T
3
3. super speed inverting pole-changing square wave current arc-welding power supply device according to claim 1 is characterized in that: dc source output floating voltage 50～70V, output current 5～400A.
4. super speed inverting pole-changing square wave current arc-welding power supply device according to claim 1 is characterized in that: auxiliary DC power supply output voltage 300～600V, output current 0.1～5A.
5. super speed inverting pole-changing square wave current arc-welding power supply device according to claim 1, it is characterized in that: fast conversion high frequency Variable Polarity Square-wave AC current-rising-rate and rate of descent are respectively 〉=50A/ μ s, output Variable Polarity Square-wave AC current transformation frequency 1Hz～20kHz, forward conduction time ratio 10%～90%, positive and negative half-wave current amplitude 5～400A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101208331A CN100460122C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting pole-changing square wave current arc-welding power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101208331A CN100460122C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting pole-changing square wave current arc-welding power supply device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101125389A CN101125389A (en) | 2008-02-20 |
| CN100460122C true CN100460122C (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101208331A Expired - Fee Related CN100460122C (en) | 2007-08-27 | 2007-08-27 | Super speed inverting pole-changing square wave current arc-welding power supply device |
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| CN (1) | CN100460122C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI452826B (en) * | 2011-01-27 | 2014-09-11 | Univ St Johns | A driving circuit without dead time for dc motor |
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| EP2529873B1 (en) * | 2011-05-30 | 2013-12-04 | EWM Hightec Welding GmbH | Arc processing control unit for controlling the arc welding flow strength for pulse welding using a protective gas ; Process of pulse welding using such process control |
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| US3564294A (en) * | 1967-06-09 | 1971-02-16 | Welding Inst | Pulse welding circuits |
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| TWI452826B (en) * | 2011-01-27 | 2014-09-11 | Univ St Johns | A driving circuit without dead time for dc motor |
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| CN101125389A (en) | 2008-02-20 |
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Assignee: Beijing Hangxing Liyuan Technologies Co., Ltd. Assignor: Beihang University Contract fulfillment period: 2009.5.5 to 2014.5.4 contract change Contract record no.: 2009990000475 Denomination of invention: Super speed inverting pole-changing square wave current arc-welding power supply device Granted publication date: 20090211 License type: Exclusive license Record date: 2009.5.13 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.5.5 TO 2014.5.4; CHANGE OF CONTRACT Name of requester: BEIJING HANGXING LIYUAN SCIENCE CO., LTD. Effective date: 20090513 |
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