CN102570835A - Phase shift full bridge converter which reduces zero load voltage of plasma cutting machine and method thereof - Google Patents
Phase shift full bridge converter which reduces zero load voltage of plasma cutting machine and method thereof Download PDFInfo
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- CN102570835A CN102570835A CN2012100307631A CN201210030763A CN102570835A CN 102570835 A CN102570835 A CN 102570835A CN 2012100307631 A CN2012100307631 A CN 2012100307631A CN 201210030763 A CN201210030763 A CN 201210030763A CN 102570835 A CN102570835 A CN 102570835A
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- bridge converter
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Abstract
The invention discloses a phase shift full bridge converter which reduces zero load voltage. The converter is characterized by comprising a first bridge arm, a second bridge arm, a resonance inductor, a transformer and an output rectifier diode. The second bridge arm is connected with two clamping diodes respectively and is used for eliminating a voltage peak on the output rectifier diode caused by the resonance inductor and output rectifier diode junction capacitance resonance. A resistor is in series connection between the resonance inductor and the two clamping diodes. The invention discloses a plasma cutting machine which reduces zero load voltage and a method for reducing the zero load voltage of the plasma cutting machine simultaneously.
Description
Technical field
The present invention relates to a kind of CUT technical field, relate in particular to a kind of phase-shifted full-bridge converter and method that reduces the CUT floating voltage.
Background technology
Plasma is to be heated to excessive temperature and by the gas of highly ionized, it will be transferred to arc power on the workpiece, and high heat is melted workpiece and blown off, forms the operating state of plasma arc cutting.Compressed air distributes two-way by air chamber after getting into cutting torch, promptly forms plasma gas and assist gas.The plasma gas arc melts metal function, and assist gas then cools off each parts of cutting torch and blows molten metal off.
CUT is the common tool of modern industry.For example in the order a car workshop and the automaker customize aspects such as chassis and vehicle body manufacturing large-scale application all arranged, building constructor uses CUT in large-scale engineering, be used to cut and make large-scale crossbeam and metal sheet.
The cutting technique parameter of plasma cutting machines directly influences stability, cut quality and the effect of cutting process.Wherein the technological parameter that has the greatest impact of article on plasma cutting equipment is floating voltage and arc stream.The plasma killer voltage has sufficiently high floating voltage, easily striking and make plasma arc smooth combustion.Floating voltage is generally 120-600V, and arc stream is generally the half the of floating voltage.
Fig. 1 is the electrical block diagram of employed CUT in the prior art.As shown in fig. 1; Available technology adopting be ZVT (Zero VoltageSwitching; ZVS) PWM full-bridge mapped structure; Due to voltage spikes on the output rectifier diode (DR1, DR2) that causes owing to resonant inductance and output rectifier diode junction capacitance resonance makes the voltage stress of output rectifier diode increase, and floating voltage is too high.This will bring circuit loss, reduce the useful life of output rectifier diode.
Therefore, be badly in need of in the prior art wanting a kind of new CUT, can eliminate the due to voltage spikes on the output rectifier diode.Thereby reduce ion cutting machine floating voltage.
Summary of the invention
In order to overcome the defective that exists in the prior art; The present invention provides phase-shifted full-bridge converter and the method that reduces the CUT floating voltage; This phase-shifted full-bridge converter and method can be eliminated the due to voltage spikes on the output rectifier diode, thereby reduce ion cutting machine floating voltage.
In order to realize the foregoing invention purpose; The present invention discloses a kind of phase-shifted full-bridge converter that reduces floating voltage; It is characterized in that comprise first brachium pontis, second brachium pontis, resonant inductance, transformer and output rectifier diode, this second brachium pontis is connected with two clamp diodes; Be used to eliminate the due to voltage spikes on the output rectifier diode that causes with output rectifier diode junction capacitance resonance by resonant inductance, the resistance of connecting between two clamp diodes of this resonant inductance and this.
Further, this first brachium pontis comprises transistor Q1 and transistor Q2, and this transistor Q1 is connected with a parasitic capacitance C1, and this transistor Q2 is connected with a parasitic capacitance C2; This second brachium pontis comprises transistor Q3 and transistor Q4, and this transistor Q3 is connected with a parasitic capacitance C3, and this transistor Q4 is connected with a parasitic capacitance C4.This Q1 and Q3 are ahead of Q4 and phase place of Q2 respectively.
Further, also be connected a capacitance Cb between the former limit of this second brachium pontis and this transformer.
The present invention discloses a kind of CUT that reduces floating voltage simultaneously, it is characterized in that, this plasma cutting machine uses like each described phase-shifted full-bridge converter of preceding text.
The present invention is a kind of method that reduces the CUT floating voltage simultaneously; Use a phase-shifted full-bridge converter; This phase-shifted full-bridge converter comprises first brachium pontis, second brachium pontis, resonant inductance, transformer and output rectifier diode; On this second brachium pontis, connecting two clamp diodes connects; Be used to eliminate the due to voltage spikes on the output rectifier diode that causes with output rectifier diode junction capacitance resonance by resonant inductance, the resistance of between two clamp diodes of this resonant inductance and this, connecting.
Further, this first brachium pontis comprises transistor Q1 and transistor Q2, and this transistor Q1 is connected with a parasitic capacitance C1, and this transistor Q2 is connected with a parasitic capacitance C2; This second brachium pontis comprises transistor Q3 and transistor Q4, and this transistor Q3 is connected with a parasitic capacitance C3, and this transistor Q4 is connected with a parasitic capacitance C4.This Q1 and Q3 are ahead of Q4 and phase place of Q2 respectively.
Further, also be connected a capacitance Cb between the former limit of this second brachium pontis and this transformer.
Compared with prior art; Phase-shifted full-bridge converter provided by the present invention and method; Through the energy among the inductance L r is fed back in the main circuit and goes through resistance R 1, clamp diode D1, D2; Reduce the peak voltage on the output rectifier diode, thereby reduce the output floating voltage, improved conversion efficiency.
Description of drawings
Can graphicly further be understood through following detailed Description Of The Invention and appended about advantage of the present invention and spirit.
Fig. 1 is the electrical block diagram of employed CUT in the prior art;
Fig. 2 is the electrical block diagram of CUT involved in the present invention;
Fig. 3 is the voltage waveform comparison diagram under all identical situation of input.
Embodiment
Specify specific embodiment of the present invention below in conjunction with accompanying drawing.
Common employed CUT is as shown in fig. 1 in the prior art.Employed CUT adopts phase-shifting full-bridge Zero-voltage-switching PWM converter (PS-FB-ZVS-PWM converter) to utilize the leakage inductance of transformer or the parasitic capacitance or the external capacitor of former limit series inductance and power tube to realize ZVT in the prior art, has realized PWM control simultaneously again.But traditional phase-shifted full-bridge converter output rectifier diode (DR1, DR2) is operated in the hard switching state, has reversely restoring process.Exporting rectifier diode (DR1, DR2) when oppositely recovering; Owing between the junction capacitance of the leakage inductance of transformer TR (or additional resonant inductance Lr) and rectifier diode (DR1, DR2) and the winding electric capacity of transformer TR high-frequency resonant takes place; Rectifier bridge produces parasitic oscillation, and rectifier diode (DR1, DR2) is gone up and had very high peak voltage.This will bring circuit loss, reduce the useful life of output rectifier diode (DR1, DR2).Therefore, must adopt the efficient buffer circuit to suppress parasitic oscillation, eliminate the peak voltage on the output rectifier diode.
The electrical block diagram of CUT provided by the present invention as shown in Figure 2.The present invention has adopted the full-bridge phase-shift soft switch structure equally.Voltage input end VIN is connected with transistor Q1, Q2, Q3 and Q4, and Q1, Q2, Q3 and Q4 form a full-bridge phase-shift soft switch, and C1 ~ C4 is respectively parasitic capacitance or the external capacitor of Q1 ~ Q4.Lr is resonant inductance (leakage inductance that has comprised transformer), and Cb is a capacitance.Two switching tubes of each brachium pontis become 180 ° of complementary conductings, and two brachium pontis angles of flow differ a phase place, and promptly phase shifting angle can be regulated output current through regulating phase shifting angle.Q1 and Q3 are ahead of Q4 and phase place of Q2 respectively, and Q1 and Q3 form leading-bridge, and Q2 and Q4 form lagging leg.
Employed phase-shifted full-bridge converter output rectifier diode is not to be operated in the hard switching state in the prior art, has reversely restoring process.When the output rectifier diode oppositely recovers; Owing between the junction capacitance of leakage inductance of transformer (or additional resonant inductance Lr) and rectifier diode (DR1, DR2) and the winding electric capacity of transformer high-frequency resonant takes place; Rectifier bridge produces parasitic oscillation, and rectifier diode (DR1, DR2) is gone up and had very high peak voltage.This will bring circuit loss, shorten the life-span of output rectifier diode (DR1, DR2).Therefore, must adopt the efficient buffer circuit to suppress parasitic oscillation, eliminate the peak voltage on the output rectifier diode (DR1, DR2).Available technology adopting adds the peak voltage that resistance (R2, R3) and electric capacity (C5, C6) absorb output rectifier diode (DR1, DR2) at the two ends of output rectifier diode (DR1, DR2), and then reduces the output floating voltage.But this technological means that prior art is used has loss, can cause conversion efficiency to reduce.
As shown in Figure 2, the maximum difference of the present invention and prior art is to have increased by two clamp diode D1 and D2, and wherein clamp diode D1 is connected with transistor Q2, and clamp diode D2 is connected with transistor Q4.Be to eliminate the due to voltage spikes on the output rectifier diode (DR1, DR2) that causes with output rectifier diode (DR1, DR2) junction capacitance resonance by resonant inductance Lr about clamp diode D1 and D2; Reduced the voltage stress of output rectifier diode (DR1, DR2); Also saved simultaneously and diminished the absorption circuit; Improve conversion efficiency, reduced floating voltage.
Under heavily loaded situation, when clamp diode D1 or D2 conducting, resonant inductance Lr is by short circuit, and its electric current remains unchanged, and in resonant inductance, switching tube and clamp diode, produces bigger conduction loss; And when load reduction to a certain degree the time, clamp diode is operated in hard off state, not only produces bigger reverse recovery loss, even can damage clamp diode.
To this problem, this patent proposes at the full-bridge converter of pulsactor to crosstalk resistance R1 between the clamp diode.Between inductance L r and clamp diode (D1 or D2) directly the series connection one resistance R 1.Like this; This full-bridge converter all can make the quick reset-to-zero of clamp diode (D1 or D2) electric current under arbitrary load; Not only can reduce the conduction loss on the former limit of converter; Improve conversion efficiency, also can avoid the hard shutoff of clamp diode (D1 or D2) simultaneously, improve the reliability of converter.Reduced the machine floating voltage.
As shown in Figure 3, Fig. 3 is the voltage waveform comparison diagram under all identical situation of input.Like Fig. 3 is under all identical situation of input, the voltage waveform comparison diagram at both output diode Dr1 or Dr2 two ends.A figure is not for adding clamping diode and resistance, and b figure is to add clamping diode and resistance.Can find out obviously that when not adding clamping diode and resistance, parasitic oscillation is very violent, due to voltage spikes is very high; And after adding clamping diode, oscillatory extinction a lot, it is many that due to voltage spikes is also little.Thereby reduction floating voltage.
Compared with prior art, the present invention reduces the peak voltage on the output rectifier diode through the energy among the inductance L r is fed back in the main circuit and goes through R1, D1, D2, thereby reduces the output floating voltage, has improved conversion efficiency.
Described in this specification is preferred embodiment of the present invention, and above embodiment is only in order to explain technical scheme of the present invention but not limitation of the present invention.All those skilled in the art all should be within scope of the present invention under this invention's idea through the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (9)
1. phase-shifted full-bridge converter that reduces floating voltage; It is characterized in that; Comprise first brachium pontis, second brachium pontis, resonant inductance, transformer and output rectifier diode; Said second brachium pontis is connected with two clamp diodes, is used to eliminate the due to voltage spikes on the output rectifier diode that is caused with output rectifier diode junction capacitance resonance by resonant inductance, the resistance of connecting between said resonant inductance and said two clamp diodes.
2. phase-shifted full-bridge converter as claimed in claim 1 is characterized in that, said first brachium pontis comprises transistor Q1 and transistor Q2, and said transistor Q1 is connected with a parasitic capacitance C1, and said transistor Q2 is connected with a parasitic capacitance C2; Said second brachium pontis comprises transistor Q3 and transistor Q4, and said transistor Q3 is connected with a parasitic capacitance C3, and said transistor Q4 is connected with a parasitic capacitance C4.
3. phase-shifted full-bridge converter as claimed in claim 2 is characterized in that, said Q1 and Q3 are ahead of Q4 and phase place of Q2 respectively.
4. phase-shifted full-bridge converter as claimed in claim 1 is characterized in that, also is connected a capacitance Cb between the former limit of said second brachium pontis and said transformer.
5. a CUT that reduces floating voltage is characterized in that, said CUT uses like each described phase-shifted full-bridge converter of claim 1 to 4.
6. method that reduces the CUT floating voltage; It is characterized in that; Use a phase-shifted full-bridge converter; Said phase-shifted full-bridge converter comprises first brachium pontis, second brachium pontis, resonant inductance, transformer and output rectifier diode; On said second brachium pontis, connect two clamp diodes and connect, be used to eliminate the due to voltage spikes on the output rectifier diode that causes with output rectifier diode junction capacitance resonance by resonant inductance, the resistance of between said resonant inductance and said two clamp diodes, connecting.
7. the method for reduction CUT floating voltage as claimed in claim 6 is characterized in that, said first brachium pontis comprises transistor Q1 and transistor Q2, and said transistor Q1 is connected with a parasitic capacitance C1, and said transistor Q2 is connected with a parasitic capacitance C2; Said second brachium pontis comprises transistor Q3 and transistor Q4, and said transistor Q3 is connected with a parasitic capacitance C3, and said transistor Q4 is connected with a parasitic capacitance C4.
8. the method for reduction CUT floating voltage as claimed in claim 7 is characterized in that, said Q1 and Q3 are ahead of Q4 and phase place of Q2 respectively.
9. the method for reduction CUT floating voltage as claimed in claim 7 is characterized in that, also is connected a capacitance Cb between the former limit of said second brachium pontis and said transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100307631A CN102570835A (en) | 2012-02-13 | 2012-02-13 | Phase shift full bridge converter which reduces zero load voltage of plasma cutting machine and method thereof |
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| CN2012100307631A CN102570835A (en) | 2012-02-13 | 2012-02-13 | Phase shift full bridge converter which reduces zero load voltage of plasma cutting machine and method thereof |
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| CN2012100307631A Pending CN102570835A (en) | 2012-02-13 | 2012-02-13 | Phase shift full bridge converter which reduces zero load voltage of plasma cutting machine and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066854A (en) * | 2012-12-31 | 2013-04-24 | 华为技术有限公司 | Full bridge topology power supply, control method and communication equipment |
| CN104539161A (en) * | 2014-12-02 | 2015-04-22 | 许继电气股份有限公司 | Phase-shift full-bridge zero-voltage switch converter |
| CN104741748A (en) * | 2015-02-11 | 2015-07-01 | 上海广为焊接设备有限公司 | Control system for reducing inverter-type plasma cutting machine secondary side floating voltage |
| CN106080240A (en) * | 2016-07-02 | 2016-11-09 | 许昌学院 | A kind of sub-batter-charghing system of power lithium battery used for electric vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1801591A (en) * | 2005-01-08 | 2006-07-12 | 艾默生网络能源系统有限公司 | Improved inductive voltage clamping full-bridge soft switching circuit |
| CN202178708U (en) * | 2011-07-29 | 2012-03-28 | 深圳麦格米特电气股份有限公司 | Phase-shifted full-bridge primary side clamping circuit |
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2012
- 2012-02-13 CN CN2012100307631A patent/CN102570835A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801591A (en) * | 2005-01-08 | 2006-07-12 | 艾默生网络能源系统有限公司 | Improved inductive voltage clamping full-bridge soft switching circuit |
| CN202178708U (en) * | 2011-07-29 | 2012-03-28 | 深圳麦格米特电气股份有限公司 | Phase-shifted full-bridge primary side clamping circuit |
Non-Patent Citations (1)
| Title |
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| 王惠庆等: "带箝位辅助谐振支路的改进型变换器研究", 《电力电子技术》, vol. 40, no. 3, 30 June 2006 (2006-06-30), pages 20 - 23 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066854A (en) * | 2012-12-31 | 2013-04-24 | 华为技术有限公司 | Full bridge topology power supply, control method and communication equipment |
| CN103066854B (en) * | 2012-12-31 | 2016-03-02 | 华为技术有限公司 | Full-bridge topology power supply, control method and communication equipment |
| CN104539161A (en) * | 2014-12-02 | 2015-04-22 | 许继电气股份有限公司 | Phase-shift full-bridge zero-voltage switch converter |
| CN104539161B (en) * | 2014-12-02 | 2018-03-23 | 许继电气股份有限公司 | Phase-shifting full-bridge ZVT converter |
| CN104741748A (en) * | 2015-02-11 | 2015-07-01 | 上海广为焊接设备有限公司 | Control system for reducing inverter-type plasma cutting machine secondary side floating voltage |
| CN104741748B (en) * | 2015-02-11 | 2017-01-11 | 上海广为焊接设备有限公司 | Control system for reducing inverter-type plasma cutting machine secondary side floating voltage |
| CN106080240A (en) * | 2016-07-02 | 2016-11-09 | 许昌学院 | A kind of sub-batter-charghing system of power lithium battery used for electric vehicle |
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Application publication date: 20120711 |