CN103170719B - Method for operating resistor welding apparatus - Google Patents
Method for operating resistor welding apparatus Download PDFInfo
- Publication number
- CN103170719B CN103170719B CN201210557721.3A CN201210557721A CN103170719B CN 103170719 B CN103170719 B CN 103170719B CN 201210557721 A CN201210557721 A CN 201210557721A CN 103170719 B CN103170719 B CN 103170719B
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- Prior art keywords
- branch road
- triggering
- welding
- welder
- synchronous rectifier
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- 238000003466 welding Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 30
- 230000001360 synchronised effect Effects 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000001960 triggered effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 6
- 230000009897 systematic effect Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/241—Electric supplies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Generation Of Surge Voltage And Current (AREA)
- Arc Welding Control (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a method for operating a resistor welding apparatus. The power transmission manner on the resistor welding apparatus is not the optimum manner. The invention relates to the resistor welding apparatus with a welding transformer, the welding transformer includes first and second secondary windings which are coupled with each other, a primary winding and a synchronous rectifier. The operating resistor welding apparatus runs following a specific method, and power transmission is optimized on the system layer in the method.
Description
Technical field
A kind of method and one kind for running welder of present invention explanation is hinged with as such electric resistance welding
The welder put, wherein welding transformer include the first and second secondary windings being coupled each other and primary around
Group, and wherein described synchronous rectifier includes the first and second commutator branch roads, the first and second commutators branch road phase
Ground is answered by means of first and second secondary windings to connect and supply welding current to the first and second welding electrodes, and
And wherein described synchronous rectifier is so triggered in the case of using triggering device by means of thyristor,
So that the thyristor being arranged in the commutator branch road is on the armature winding one in the order of more polar exchanging
Rise and connect.
Background technology
When being resistance welded with unidirectional current, it is desirable to the very high electric current being likely to be in the range of kilo-ampere.For
These electric currents are produced, transformator is usually used, the transformator is in primary side by means of full-bridge triggering and in primary side
Electric current is supplied to welding clamp by means of diode rectifier.
The use of diode rectifier is had the disadvantage that, i.e., is occurred in that due to the conducting resistance of diode higher
Loss power.
The content of the invention
The task of the present invention is to illustrate a kind of welder and a kind of for running this welder
Method, significantly improves the systematicness of whole device by means of methods described relative to the solution known from the prior art
Energy.
For this purpose, the present invention proposes a kind of novel method for supplying electric current to welder.
The welder is especially including a welding transformer with first and second secondary windings.The two
Secondary windings carry out the coupling of magnetic each other.Comprise additionally in an armature winding, the armature winding and described two secondary windings
The coupling of magnetic is carried out.
In addition there is a synchronous rectifier, the synchronous rectifier includes the first and second commutator branch roads, this two
Road connects by means respectively of described first and second secondary windings and supplies welding current to first and second welding electrode.
The synchronous rectifier is made preferably by means of field-effect transistor by means of thyristor by the present invention
So triggered with the case of triggering device so that be arranged in switch element in the commutator branch road it is described it is primary around
The state for being remained up during polarity replacing together is carried out in group so that the required welding electricity on the welding electrode
Stream can commutate.
This concept that commutates refers to transformation of the welding current between two commutator branch roads（Welding current commutates）.According to
Primary voltage, welding current at least must half commutated on corresponding another rectification branch road first, be used for such that it is able to transmit
The energy for being welded.
By means of the thyristor, compared with the known diode rectifier with higher conducting resistance
Realize the reduction of loss power.As multiple thyristors can be arranged in parallel in the synchronous rectifier branch road
And up to 15kA or higher electric current can be connected, wherein the loss power is reduced about relative to diode rectifier
70%。
Full-bridge is provided with primary side.The full-bridge can such as include IGBTs for this（Insulated gate gate transistors）, institute
State IGBTs and be connected to each other to a bridge circuit.The armature winding is arranged between two bridge arms, and by means of transistor
Mutual triggering obtaining the loading of electric current.
By means of this processing mode, realize during the energy for carrying out active is transmitted loss power reduction and
Higher voltage is provided during the commutation of secondary current.
This causes such result again, that is, improve the energy transmission time of active and thus also improve systematic function.
It is preferred that being existed come actually by the triggering device in the case of using the numerical value that represent primary current threshold value
The primary current occurred in running is compared with the primary current threshold value.The thyristor is according to comparing
Result switching.It is possible thereby to recognize the end of commutation process and it is possible thereby to further improve systematic function.
At the end of commutation process, the only one switch element in described two switch elements can also also be remained up
State.The switch order needed for this is produced by the detection of the primary current threshold value.The primary current threshold value can
With in the range of 70% to 100%.
Magnetic field sensor is arranged on the welding transformer preferably.The signal of the magnetic field sensor is filled by the triggering
Put to analyze, so as to also switch the switch element in the case of using analysis result.By means of the magnetic field sensor, and
Equally can exert one's influence to commutation process afterwards and can further improve systematic function.
Not only described first but also the component of the second commutator branch road is all preferably configured as symmetrical structure.By means of
The centre tap of the primary side of the welding transformer is connected to the synchronous rectifier on two-part secondary circuit.Institute
The pulse that the triggering of the first and second commutator branch roads is stated by means of substantial symmetry is carrying out.It is this symmetrical to be configured to reality
Now uniform to magnetize, this advantageously affects energy transmission and systematic function.
The triggering device includes control logic circuit, is provided with the current sensing mechanism and gate circuit of comparator.This two
The such collective effect of person, so as to produce the required pulse for triggering.The advantage of this solution is that by one
Plant device closely.
The triggering is carried out preferably by means of integrated on-off circuit or by means of discrete component.The triggering
Device can also be realized by means of microcontroller.It can also be integrated in welding transformer.Using microcontroller
In the case of, it is also possible to the triggering device is realized in the case of the joint for not having extra outside.
The present invention also includes a kind of welder with welding transformer, and the resistance transformator then includes first
With the second secondary windings being coupled each other and armature winding and synchronous rectifier.The synchronous rectifier includes first and
Two commutator branch roads.The commutator branch road correspondingly can be triggered by means of described first and second secondary windings.Equally
Be provided with it is a kind of for according to one of method mentioned above feature come implement the operation of the welder triggering fill
Put.
Such a welder have in secondary circuit ineffective time for reducing and thus with it is known
Solution is compared to have and obtains improved systematic function.
It is preferred that equally including a kind of electric current adjustment mechanism, the electric current adjustment mechanism is by means of the primary in the armature winding
The electric current detected in circuit or in the secondary circuit of the secondary windings is running.
This can accurately be adjusted to the process in the secondary circuit and extraly energetically be affected system
Performance.
It is preferred that the triggering of the commutator branch road is particularly in 1kHz to 10kHz with the range of 1kHz to 20kHz
Between frequency realizing.
Optimal result has been obtained for these frequency ranges.
Description of the drawings
Fig. 1 is the construction of the commutator for obtaining optimizing by the present invention；
Fig. 2 is the single time range of used pulse；And
Fig. 3 is the detailed figure of the triggering device.
Specific embodiment
Fig. 1 shows full-bridge together with synchronous rectifier.Both is arranged on resistance welding equipment（It is not shown）In.
The full-bridge illustrates that on the left side it includes two bridge arms.This two bridge arms are in DC voltage（It is not shown）On.Often
Bar bridge arm includes switch Q1, Q4 and Q2 of two forms for being configured to IGBTs, Q3.The IGBTs is touched by means of pulse train
Send out.There is the armature winding 4a of the welding transformer in the bridge arm of described device.Show that the synchronization is whole on the right side of Fig. 1
Stream device.This synchronous rectifier includes two secondary windings 4b and 4c of the welding transformer.The two windings 4b, c connect
And possess centre tap.In such an embodiment, corresponding welding electrode 5a, the welding are connected on the centre tap
Electrode should have positive potential in welding process（+）.In such an embodiment（It is positive potential on the centre tap）,
It is connected in welding process to have nagative potential on corresponding other joints（-）Welding electrode 5b.
Workpiece 6 can be arranged between described two welding electrode 5a, b, the workpiece can be by means of by the present invention's
Resistance welding method is being connected to each other.
In order to trigger described welding electrode 5a, b, there is field-effect transistor in the branch road of the synchronous rectifier in addition
Q5, Q6, the branch road of the synchronous rectifier is by means of the pulse train by the present invention（Referring to Fig. 2）To produce.
Fig. 2 depicts burst length scope.
Scope I：Primary voltage Uprim is positive.In transformer secondary output winding, electric current Isek is changed from the tie point
To second branch road.Here connects two field-effect transistors Q5, Q6, for reducing power.At the end of the time period I
Tail, cuts off the field-effect transistor Q5 for about the 90% of current threshold and commutates the current to and the field effect
The unloaded diode of transistor Q5 parallel orientations.Although this is carried out with higher forward voltage, with rational less
Power carrying out because electric current very little.
Scope II：Primary voltage Uprim is positive.In the beginning of the time period II, the secondary current Isek's arrives
Commutation on second branch road terminates.Thus there is no longer electric current Isek to flow in the unloaded diode in parallel with Q5.The field effect
Answer state that transistor Q6 remains up and continue to conduct welding current Isek.The welding current is according to formula Usek=L*
Dl/dt+I*R is rising.Transmission energy on one's own initiative at this stage.
Scope III：Primary voltage Uprim is commutated on the unloaded diode and with the primary transformation
Device inductance unloaded and become negative.The field-effect transistor Q5 is reclosed and described two field-effect transistor Q5, Q6 are straight
Terminate correspondingly to undertake the welding current Isek of half to stage III（The unloaded stage）.
Scope IV：Without previously given primary voltage Uprim.Flowed by described field-effect transistor Q5, Q6 respectively
The welding current Isek of half.Output voltage Usek1 is born due to the voltage drop above the field-effect transistor and is declined（It is unloaded
Stage）.
Scope V：Primary voltage Uprim is negative.In transformer secondary output winding, electric current Isek is changed from the tie point
To second branch road.Here connects described two field-effect transistor Q5, Q6, for reducing power.In the time period V
End, the field-effect transistor Q6 is cut off for about the 90% of current threshold and is commutated the current to and the field
The unloaded diode of effect transistor Q6 parallel orientations.Although this is carried out with higher forward voltage, with reasonably compared with
Little power carrying out because electric current very little.
Scope VI：Primary voltage Uprim is negative.In the beginning of the time period VI, the secondary current Isek's arrives
Commutation on second branch road terminates.Thus there is no longer electric current Isek to flow in the unloaded diode in parallel with Q6.The field effect
Answer state that transistor Q5 remains up and continue to conduct welding current Isek.The welding current is according to formula Usek=L*
Dl/dt+I*R is rising.Transmission energy on one's own initiative at this stage.
Scope VII：Primary voltage Uprim is commutated on the unloaded diode and with the primary transformation
Device inductance unloaded and just become.The field-effect transistor Q5 is connected and described two field-effect transistor Q5, Q6 are until rank
Section VII terminates correspondingly to undertake the welding current Isek of half（The unloaded stage）.
Scope VIII：Without previously given primary voltage.Flowed respectively half by described field-effect transistor Q5, Q6
Welding current Isek.Output voltage Usek1 is born due to the voltage drop above the field-effect transistor and is declined（Unloaded rank
Section）.
Prompting：Reference Q1 to Q4 in Fig. 2 is related to the bridge circuit that figure 1 illustrates there together with Uprim
IGBT ' the s for illustrating.It is therefore proposed that concurrently observing to Fig. 1 when Fig. 2 is studied.
Fig. 3 illustrates integrated or discrete circuit as function box, and the circuit is not opened only by means of full-bridge
Close Q1 to Q4 to provide the trigger pulse sequence of the triggering of the primary side for the winding, and provide for the synchronization
The trigger pulse sequence triggered by the transistor Q5 and Q6 of commutator.
Claims (10)
1. for the method for supplying electric current to the welder with welding transformer and synchronous rectifier, wherein the electricity
Weldering transformator includes the first and second secondary windings being coupled each other and armature winding, and wherein described synchronous rectifier
Including the first and second commutator branch roads, the first and second commutators branch road is correspondingly by means of described first and second times
Level winding come connect and to the first and second welding electrodes supply welding current, and wherein described synchronous rectifier by means of
Thyristor（Q5、Q6）So triggered in the case of using triggering device so that be arranged in the rectification
Thyristor in device branch road（Q5、Q6）Connected in the order of more polar exchanging together on the armature winding.
2. the method as described in claim 1, wherein by described in the case of using the numerical value that represent primary current threshold value
The primary current for actually occurring in running is compared by triggering device with the primary current threshold value, and its
Described in thyristor（Q5、Q6）Switch also according to result of the comparison.
3. method in any one of the preceding claims wherein is pressed, wherein arranging magnetic field sensing on the welding transformer
Device, the signal of the magnetic field sensor are analyzed by the triggering device, wherein also switching institute in the case of using analysis result
State switch element（Q5、Q6）.
4. the method as described in claim 1 or 2, wherein not only described first and also the second commutator branch road component all
Be configured to symmetrical structure, and wherein by means of the welding transformer primary side centre tap come will be the synchronization whole
Stream device is connected on the two-part secondary circuit, wherein the triggering of the first and second commutators branch road is by means of symmetrical
Pulse carrying out.
5. the method as described in claim 4, wherein the triggering device includes control logic circuit（31）, be provided with comparator
（32）Current sensing mechanism and gate circuit（33）, their such collective effects, so as to produce symmetrical pulse.
6. the method as described in claim 1 or 2, wherein the triggering is by means of integrated on-off circuit or by means of discrete
Component carrying out.
7. with welding transformer welder, the welding transformer include first and second be coupled each other time
Level winding and armature winding and synchronous rectifier, wherein the synchronous rectifier includes first and second commutator branch road, its
Described in commutator branch road correspondingly can be triggered by means of described first and second secondary windings, and which provided use
Implement the triggering device run according to any one of claim to a method 1 to 6.
8. the welder as described in claim 7, including electric current adjustment mechanism, the electric current adjustment mechanism by means of
The electric current detected in the primary circuit of the armature winding or in the secondary circuit of the secondary windings is running.
9. the welder as described in claim 8, wherein the triggering of the commutator branch road is with 1kHz to 20kHz
In the range of frequency carrying out.
10. the welder as described in claim 8, wherein the triggering of the commutator branch road is with arriving in 1kHz
Frequency between 10kHz is carrying out.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011121836.3 | 2011-12-21 | ||
| DE102011121836A DE102011121836A1 (en) | 2011-12-21 | 2011-12-21 | Supplying power to resistance welding apparatus, comprises supplying welding current to first welding electrode and second welding electrode, and controlling synchronous rectifier by semiconductor switching elements using control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103170719A CN103170719A (en) | 2013-06-26 |
| CN103170719B true CN103170719B (en) | 2017-04-12 |
Family
ID=48575478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210557721.3A Active CN103170719B (en) | 2011-12-21 | 2012-12-20 | Method for operating resistor welding apparatus |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103170719B (en) |
| DE (1) | DE102011121836A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012025202A1 (en) * | 2012-12-27 | 2014-07-03 | Robert Bosch Gmbh | Operating rectifier comprises connecting first and second rectifier sectors to transformer by first and second windings, and controlling each sector by semiconductor switching element of FET |
| ES2701500T3 (en) * | 2015-12-17 | 2019-02-22 | Bosch Gmbh Robert | Current converter circuit |
| DE102018209983A1 (en) * | 2018-06-20 | 2019-12-24 | Robert Bosch Gmbh | Resistance welding device and resistance welding method for resistance welding at least one component |
| DE102019204794A1 (en) * | 2019-04-04 | 2020-10-08 | Robert Bosch Gmbh | Rectifier for a welding transformer of a welding device and method for producing such a rectifier |
| DE102019205037A1 (en) * | 2019-04-09 | 2020-10-15 | Robert Bosch Gmbh | RESISTANCE WELDING DEVICE AND RESISTANCE WELDING METHOD FOR RESISTANCE WELDING OF AT LEAST ONE COMPONENT |
| DE102021204581B4 (en) * | 2021-05-06 | 2023-02-16 | Robert Bosch Gesellschaft mit beschränkter Haftung | DEVICE AND METHOD FOR CONTROLLING A RECTIFIER FOR A WELDING TRANSFORMER |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1838517A (en) * | 2005-03-24 | 2006-09-27 | 林肯环球公司 | Improved three stage power source for electronic arc welding |
| CN101104219A (en) * | 2007-06-18 | 2008-01-16 | 华南理工大学 | High frequency contravariant direct-current spot-welding power supply device and its application |
| DE102007042771B3 (en) * | 2007-09-07 | 2009-01-08 | Robert Bosch Gmbh | Operation of power supply for resistance welding equipment, uses control circuit supplying pulses to synchronous rectifier connected to transformer secondaries |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10048404A1 (en) * | 2000-09-29 | 2002-04-11 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Synchronous rectifier circuit |
| US6618274B2 (en) * | 2001-10-09 | 2003-09-09 | Innoveta Technologies | Synchronous rectifier controller to eliminate reverse current flow in a DC/DC converter output |
-
2011
- 2011-12-21 DE DE102011121836A patent/DE102011121836A1/en active Pending
-
2012
- 2012-12-20 CN CN201210557721.3A patent/CN103170719B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1838517A (en) * | 2005-03-24 | 2006-09-27 | 林肯环球公司 | Improved three stage power source for electronic arc welding |
| CN101104219A (en) * | 2007-06-18 | 2008-01-16 | 华南理工大学 | High frequency contravariant direct-current spot-welding power supply device and its application |
| DE102007042771B3 (en) * | 2007-09-07 | 2009-01-08 | Robert Bosch Gmbh | Operation of power supply for resistance welding equipment, uses control circuit supplying pulses to synchronous rectifier connected to transformer secondaries |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011121836A1 (en) | 2013-06-27 |
| CN103170719A (en) | 2013-06-26 |
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