CN101394134A - Three-phase digital time division balance large power AC welding power source - Google Patents
Three-phase digital time division balance large power AC welding power source Download PDFInfo
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- CN101394134A CN101394134A CNA2008101955175A CN200810195517A CN101394134A CN 101394134 A CN101394134 A CN 101394134A CN A2008101955175 A CNA2008101955175 A CN A2008101955175A CN 200810195517 A CN200810195517 A CN 200810195517A CN 101394134 A CN101394134 A CN 101394134A
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Abstract
The invention relates to a three-phase digital time-sharing balance alternating current welding power supply with high power, in particular to a three-phase to signal-phase welding power supply, which comprises a three-phase controlled switching circuit, a three-phase to single-phase transformer and a control circuit. The alternating current generates a three-phase time-sharing balance voltage through the three-phase controlled switching circuit composed of thyristors and outputs the voltage by transforming three phase into single phase through the three-phase to single-phase transformer and supplied to the alternating current load; under the control of the singlechip control circuit, the three-phase alternating current supplies power to a primary three-phase winding of a main transformer according to the time sequence, and the three-phase to single-phase process is realized through a three-phase synthesized transformer in the single-phase output sequentially synthesized by the secondary output three phase. The invention has the advantages of balanced three-phase input power, energy conservation and controllable single-phase output voltage.
Description
Technical field
The present invention relates to a kind of three-phase digital time division balance large power AC welding power source, is the single-phase sources of welding current of a kind of three phase transformations, has three-phase equilibrium, energy-conservation, advantage that output voltage is controlled.
Background technology
Under the background of three-phase electrical power system, the Monophase electric power equipment of middle low power constantly occurs.The single phase alternating current (A.C.) high power load mainly adopts phase line power voltage supply mode, causes three-phase voltage seriously uneven.For solving the three-phase imbalance problem, mainly adopted several technology at present:
1, three-phase to single-phase balance transformer can reach the single-phase balanced transformation of three phase transformations, and the perfect condition negative-sequence current is zero, and power factor 1 can also the absorption portion harmonic wave; Cancel electric phase-splitting, realize cophase supply.Transformer adopting uiform section three pillar type iron core, former edge joint line is inverse-T-shaped, inferior edge joint line is anti-" L " shape, has phase shifting capacitor, reactor group and phase-shift reactor arranged perpendicular on phase place of filter function concurrently; According to the size of load and the capacity of power factor configuration phase shifting capacitor, reactor group and phase-shift reactor.The transformer device structure complexity, the cost height.
2, be combined to main transformer by three-phase alternating current gate-controlled switch and three and control circuit is formed three phase transformation single phase poaer supplies.Under the control of control circuit, three-phase alternating current is in chronological order respectively to one time three phase winding power supply of main transformer, is combined to transformer by three, exports the synthetic single-phase output of three phase sequences at secondary, realizes the process that three phase transformations are single-phase.Fig. 7 is a work wave, and wherein dash area is the single-phase output voltage waveforms of Circuit Fault on Secondary Transformer, and its output frequency is 150Hz, is output as nonsinusoidal waveform.
Summary of the invention
The present invention proposes a kind of three-phase digital time division balance large power AC welding power source, is combined to main transformer and single chip machine controlling circuit is formed the single-phase large power AC welding power source of three phase transformations by thyristor gate-controlled switch and three.Under the control of single chip machine controlling circuit, three-phase alternating current is in chronological order respectively to one time three phase winding power supply of main transformer, is combined to transformer by three, exports the synthetic single-phase output of three phase sequences at secondary, realizes the process that three phase transformations are single-phase.Three-phase input power balance, single-phase output voltage is controlled.
According to technical scheme provided by the invention, three-phase digital time division balance large power AC welding power source, comprise single-phase controlled AC power of three phase transformations and control circuit, it is characterized in that: the single-phase controlled AC power of described three phase transformations comprises three-phase gate-controlled switch circuit and transformer changing from three phases to single phase T, described three-phase gate-controlled switch circuit is meant A that the first thyristor VTa1 and the second thyristor VTa2 form gate-controlled switch circuit mutually, the B of the 3rd thyristor VTb1 and the 4th thyristor VTb2 composition is the gate-controlled switch circuit mutually, and the C that the 5th thyristor VTc1 and the 6th thyristor VTc2 form is the gate-controlled switch circuit mutually; The output of A phase gate-controlled switch circuit and B phase line voltage u
b, B phase gate-controlled switch circuit output and C phase line voltage u
c, C phase gate-controlled switch circuit output and A phase line voltage u
aConnect the elementary of transformer changing from three phases to single phase T respectively, the secondary connection single phase alternating current (A.C.) load of transformer changing from three phases to single phase T; Three primary voltage u of transformer changing from three phases to single phase T
A1, u
B1, u
C1Time-sharing work in chronological order; Alternating current produces three-phase time division balance voltage u by three-phase gate-controlled switch circuit
A1, u
B1, u
C1,, become single-phase output voltage u through transformer changing from three phases to single phase T
2, supply with the single phase alternating current (A.C.) load; Described control circuit comprises current detection circuit, voltage detecting circuit, zero cross detection circuit, single-chip microcomputer and thyristor gating circuit; The output of described current detection circuit connects the current detecting A/D translation interface of single-chip microcomputer, and the output of described voltage detecting circuit connects the voltage detecting A/D translation interface of single-chip microcomputer, and the output of described zero cross detection circuit connects the zero passage detection interface of single-chip microcomputer; Single-chip microcomputer carries out phase sequence according to detected zero cross signal to be determined, the next thyristor that will trigger of decision according to detected input current and output voltage signal and given power ratio, is determined phase shifting angle α; The output of single-chip microcomputer produces triggering signal Ga1, Ga2, Gb1, Gb2, Gc1, Gc2 by thyristor gating circuit, is connected respectively to the gate pole of corresponding thyristor VTa1, VTa2, VTb1, VTb2, VTc1, VTc2, the switch of the thyristor that control is corresponding.
Described current detection circuit comprises three-phase ac current transformer, current signal treatment circuit, the three-phase alternating current signal that is detected the single-phase controlled ac power input end of described three phase transformations by three-phase ac current transformer is transformed into direct voltage through the current signal treatment circuit, is input to the current detecting A/D translation interface of single-chip microcomputer; Described voltage detecting circuit comprises output voltage instrument transformer, voltage signal processing circuit, the output voltage signal that is detected the single-phase controlled AC power of three phase transformations by the output voltage instrument transformer is transformed into direct voltage through voltage signal processing circuit, is input to the voltage detecting A/D translation interface of single-chip microcomputer; Described zero cross detection circuit comprises synchrotrans, synchronization signal processing circuit, and the input of synchrotrans connects three-phase alternating voltage u
a, u
b, u
c, produce synchronizing signal SA, SB, SC, through synchronization signal processing circuit, be input to the zero passage detection interface of single-chip microcomputer.
Described thyristor gating circuit comprises photoelectric isolating circuit, power amplification circuit and the pulse transformer that connects successively, and the input of photoelectric isolating circuit connects the output trigger end of single-chip microcomputer, and the output of pulse transformer connects the gate pole of corresponding thyristor respectively.
Characteristics of the present invention are: the 1. three-phase gate-controlled switch circuit of alternating current 380V by forming by thyristor, produce three-phase time division balance voltage, and through transformer changing from three phases to single phase, three-phase is become single-phase output, the supply AC load.2. synchronizing signal becomes sine wave into square-wave signal through the zero passage testing circuit, through photoelectric isolating circuit, is input to single-chip microcomputer zero passage detection interface.Detect current signal by three-phase ac current transformer and be transformed into direct voltage, be input to the current detecting A/D translation interface of single-chip microcomputer through current detection circuit and rectification circuit.Detect voltage signal by the output voltage instrument transformer and be transformed into direct voltage, be input to the voltage detecting A/D translation interface of single-chip microcomputer through voltage detecting circuit and rectification circuit.Single-chip microcomputer carries out phase sequence according to detected zero cross signal to be determined, the next thyristor that will trigger of decision.According to detected input current and output voltage signal, with given power ratio, determine the size of phase shifting angle α, single-chip microcomputer output triggering signal, output circuits for triggering by photoelectric isolating circuit, power amplification circuit, pulse transformer etc. are partly formed trigger corresponding thyristor.
Description of drawings
Fig. 1 is an overall construction drawing of the present invention.
Fig. 2 is synchrotrans part-structure figure.
Fig. 3 is the control circuit structure chart.
Fig. 4 is the single-chip microcomputer main program flow chart.
Fig. 5 is the single-phase control waveforms of three phase transformations.
Fig. 6 is the single-phase controlled ac power transformer T secondary voltage u of three phase transformations
2Output waveform.Wherein Fig. 6 a phase shifting angle α is zero, and Fig. 6 b phase shifting angle α is 60 °, and Fig. 6 c phase shifting angle α is 120 °.
Fig. 7 is combined to the work wave of the three phase transformation single phase poaer supplies that main transformer and control circuit form by three-phase alternating current gate-controlled switch and three.
Embodiment
Among Fig. 1, u
a, u
b, u
cBe the three-phase alternating current input voltage, the first thyristor VTa1 forms A gate-controlled switch circuit mutually with the second thyristor VTa2, the 3rd thyristor VTb1 forms B gate-controlled switch circuit mutually with the 4th thyristor VTb2, the 5th thyristor VTc1 forms C gate-controlled switch circuit mutually with the 6th thyristor VTc2, and they form three-phase gate-controlled switch circuit jointly.T is a transformer changing from three phases to single phase, u
A1, u
B1, u
C1Be three primary voltages of transformer T, three voltage is time-sharing work in chronological order, u
2Secondary output voltage for transformer T.The three-phase gate-controlled switch circuit of alternating current 380V by being made up of thyristor VTa1, VTa2, VTb1, VTb2, VTc1, VTc2 produces three-phase time division balance voltage u
A1, u
B1, u
C1,, three-phase is become single-phase output voltage u through changing three-phase transformer to single-phase one T
2, supply with AC load.
Among Fig. 2, three-phase alternating voltage u
a, u
b, u
cProduce synchronizing signal by synchrotrans, as the reference signal of thyristor trigger impulse, Single Chip Microcomputer (SCM) system is calculated the phase shifting angle of trigger impulse, and thyristor gating circuit carries out power amplification with trigger impulse.Synchrotrans detect three-phase alternating voltage u
a, u
b, u
cZero crossing, produce synchronizing signal SA, SB, SC, by Single Chip Microcomputer (SCM) system, thyristor gating circuit, produce triggering signal Ga1, Ga2, Gb1, Gb2, Gc1, Gc2, be connected respectively to the gate pole of corresponding thyristor VTa1, VTa2, VTb1, VTb2, VTc1, VTc2, the switch of the thyristor that control is corresponding.
Among Fig. 5, SA, SB, SC are the synchronization waveform of synchrotrans output, u
Ab, u
Bc, u
CaBe three-phase line voltage.
The operation principle of main circuit, control waveform such as Fig. 5.
In the t0-t1 period, thyristor VTa1 triggering and conducting, three-phase line voltage u
AbPositive half wave by thyristor VTa1 to the ab phase winding of transformer T, its voltage is u
A1, secondary winding output voltage u
2=u
A1The voltage u of all the other two-phase phase winding bc, ca
B1=u
C1=0.
In the t1-t2 period, thyristor Vta2 triggering and conducting, three-phase line voltage u
AbNegative half-wave by thyristor Vta2 to the ab phase winding of transformer T, its voltage is u
A1, secondary winding output voltage u
2=u
A1The voltage u of all the other two-phase phase winding bc, ca
B1=u
C1=0.
In the t2-t3 period, six thyristor complete shut-downs are disconnected, u
2=u
A1=u
B1=u
C1=0.
In the t3-t4 period, thyristor VTb1 triggering and conducting, three-phase line voltage u
BcPositive half wave by thyristor VTb1 to the bc phase winding of transformer T, its voltage is u
B1, secondary winding output voltage u
2=u
B1The voltage u of all the other two-phase phase winding ab, ca
A1=u
C1=0.
In the t4-t5 period, thyristor Vtb2 triggering and conducting, three-phase line voltage u
BcNegative half-wave by thyristor Vtb2 to the bc phase winding of transformer T, its voltage is u
B1, secondary winding output voltage u
2=u
B1The voltage u of all the other two-phase phase winding ab, ca
A1=u
C1=0.
In the t5-t6 period, six thyristor complete shut-downs are disconnected, u
2=u
A1=u
B1=u
C1=0.
In the t6-t7 period, thyristor VTc1 triggering and conducting, three-phase line voltage u
CaPositive half wave by thyristor VTc1 to the ca phase winding of transformer T, its voltage is u
C1, secondary winding output voltage u
2=u
C1The voltage u of all the other two-phase phase winding ab, bc
A1=u
B1=0.
In the t7-t8 period, thyristor Vtc2 triggering and conducting, three-phase line voltage u
CaNegative half-wave by thyristor Vtc2 to the ca phase winding of transformer T, its voltage is u
C1, secondary winding output voltage u
2=u
C1The voltage u of all the other two-phase phase winding ab, bc
A1=u
B1=0.
Carry out the work of next cycle later at the t8 time point.
At t0-t1, t1-t2, t3-t4, t4-t5, t6-t7, the t7-t8 period, control triggers phase shifting angle α, can get phase shifting angle α from 0 ° to 180 °, output voltage u
2Change to zero variation waveform from maximum.
Fig. 3 mainly forms structure for single chip part.Form Single Chip Microcomputer (SCM) system by synchronization signal processing circuit, voltage signal processing circuit, current signal treatment circuit, power given circuit, single-chip microcomputer, partly form thyristor gating circuit by photoelectricity isolation, power amplification, pulse transformer etc.Synchronizing signal SA, SB, SC are input to single-chip microcomputer zero passage detection interface through synchronization signal processing circuit.Detect current signal through the current signal treatment circuit by three-phase ac current transformer, be input to the current detecting A/D translation interface of single-chip microcomputer.Detect voltage signal through voltage signal processing circuit by the output voltage instrument transformer, be input to the voltage detecting A/D translation interface of single-chip microcomputer.Single-chip microcomputer carries out phase sequence according to detected zero cross signal to be determined, the next thyristor that will trigger of decision.According to detected input current and output voltage signal and given power ratio, determine the size of phase shifting angle α, single-chip microcomputer output triggering signal by thyristor gating circuit, drives corresponding thyristor.
Fig. 4 is the Single-chip Controlling main program flow chart.Main program comprises that zero passage detection, current detecting, voltage detecting, phase sequence are determined, A/D changes, trigger angle is calculated, trigger impulse output supervisor.
Claims (3)
1, three-phase digital time division balance large power AC welding power source, comprise single-phase controlled AC power of three phase transformations and control circuit, it is characterized in that: the single-phase controlled AC power of described three phase transformations comprises three-phase gate-controlled switch circuit and transformer changing from three phases to single phase (T), described three-phase gate-controlled switch circuit is meant first thyristor (VTa1) and second thyristor (VTa2) composition A gate-controlled switch circuit mutually, the 3rd thyristor (VTb1) is formed B gate-controlled switch circuit mutually with the 4th thyristor (VTb2), and the 5th thyristor (VTc1) is formed C gate-controlled switch circuit mutually with the 6th thyristor (VTc2); The output of A phase gate-controlled switch circuit and B phase line voltage (u
b), the output and the C phase line voltage (u of B phase gate-controlled switch circuit
c), the output and the A phase line voltage (u of C phase gate-controlled switch circuit
a) connect the elementary of transformer changing from three phases to single phase (T), the secondary connection single phase alternating current (A.C.) load of transformer changing from three phases to single phase (T) respectively; Three primary voltage (u of transformer changing from three phases to single phase (T)
A1, u
B1, u
C1) time-sharing work in chronological order; Alternating current produces three-phase time division balance voltage (u by three-phase gate-controlled switch circuit
A1, u
B1, u
C1), through transformer changing from three phases to single phase (T), become single-phase output voltage (u
2), supply with the single phase alternating current (A.C.) load; Described control circuit comprises current detection circuit, voltage detecting circuit, zero cross detection circuit, single-chip microcomputer and thyristor gating circuit; The output of described current detection circuit connects the current detecting A/D translation interface of single-chip microcomputer, and the output of described voltage detecting circuit connects the voltage detecting A/D translation interface of single-chip microcomputer, and the output of described zero cross detection circuit connects the zero passage detection interface of single-chip microcomputer; Single-chip microcomputer carries out phase sequence according to detected zero cross signal to be determined, the next thyristor that will trigger of decision according to detected input current and output voltage signal and given power ratio, is determined phase shifting angle (α); Thyristor gating circuit is passed through in the output of single-chip microcomputer, produce triggering signal (Ga1, Ga2, Gb1, Gb2, Gc1, Gc2), be connected respectively to the gate pole of corresponding thyristor (VTa1, VTa2, VTb1, VTb2, VTc1, VTc2), the switch of the thyristor that control is corresponding.
2, three-phase digital time division balance large power AC welding power source according to claim 1, it is characterized in that, described current detection circuit comprises three-phase ac current transformer, current signal treatment circuit, the three-phase alternating current signal that is detected the single-phase controlled ac power input end of described three phase transformations by three-phase ac current transformer is transformed into direct voltage through the current signal treatment circuit, is input to the current detecting A/D translation interface of single-chip microcomputer; Described voltage detecting circuit comprises output voltage instrument transformer, voltage signal processing circuit, the output voltage signal that is detected the single-phase controlled AC power of three phase transformations by the output voltage instrument transformer is transformed into direct voltage through voltage signal processing circuit, is input to the voltage detecting A/D translation interface of single-chip microcomputer; Described zero cross detection circuit comprises synchrotrans, synchronization signal processing circuit, and the input of synchrotrans connects three-phase alternating voltage (u
a, u
b, u
c), produce synchronizing signal (SA, SB, SC), through synchronization signal processing circuit, be input to the zero passage detection interface of single-chip microcomputer.
3, three-phase digital time division balance large power AC welding power source according to claim 1, it is characterized in that, described thyristor gating circuit comprises photoelectric isolating circuit, power amplification circuit and the pulse transformer that connects successively, the input of photoelectric isolating circuit connects the output trigger end of single-chip microcomputer, and the output of pulse transformer connects the gate pole of corresponding thyristor respectively.
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|---|---|---|---|
| CN2008101955175A CN101394134B (en) | 2008-10-15 | 2008-10-15 | Three-phase digital time division balance large power AC welding power source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101955175A CN101394134B (en) | 2008-10-15 | 2008-10-15 | Three-phase digital time division balance large power AC welding power source |
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| CN101394134A true CN101394134A (en) | 2009-03-25 |
| CN101394134B CN101394134B (en) | 2010-07-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255492A (en) * | 2011-07-26 | 2011-11-23 | 扬州双鸿电子有限公司 | Main circuit for increasing power factor of controllable silicon power supply |
| CN103286418A (en) * | 2012-03-02 | 2013-09-11 | 深圳麦格米特电气股份有限公司 | Three-phase welder circuit |
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN105896939A (en) * | 2016-06-24 | 2016-08-24 | 南京工程学院 | Digital thyristor trigger method |
| CN106959399A (en) * | 2017-05-11 | 2017-07-18 | 长沙瑞斯康通信技术有限公司 | Platform area identifying system and its method |
-
2008
- 2008-10-15 CN CN2008101955175A patent/CN101394134B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255492A (en) * | 2011-07-26 | 2011-11-23 | 扬州双鸿电子有限公司 | Main circuit for increasing power factor of controllable silicon power supply |
| CN102255492B (en) * | 2011-07-26 | 2014-04-23 | 扬州双鸿电子有限公司 | Main circuit for increasing power factor of controllable silicon power supply |
| CN103286418A (en) * | 2012-03-02 | 2013-09-11 | 深圳麦格米特电气股份有限公司 | Three-phase welder circuit |
| CN103286418B (en) * | 2012-03-02 | 2016-03-02 | 深圳麦格米特电气股份有限公司 | A kind of Three-phase welder circuit |
| CN105048830A (en) * | 2015-08-25 | 2015-11-11 | 南京工程学院 | Three-phase AC voltage regulation digital control device and control method |
| CN105896939A (en) * | 2016-06-24 | 2016-08-24 | 南京工程学院 | Digital thyristor trigger method |
| CN106959399A (en) * | 2017-05-11 | 2017-07-18 | 长沙瑞斯康通信技术有限公司 | Platform area identifying system and its method |
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|---|---|
| CN101394134B (en) | 2010-07-21 |
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Assignee: Jiangsu Eastone Technology Co., Ltd. Assignor: Jiangnan University Contract record no.: 2011320000775 Denomination of invention: Three-phase digital time division balance large power AC welding power source Granted publication date: 20100721 License type: Exclusive License Open date: 20090325 Record date: 20110603 |
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