CN101854122B - High-voltage inverted low-voltage chopped-mode welding power supply - Google Patents
High-voltage inverted low-voltage chopped-mode welding power supply Download PDFInfo
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- CN101854122B CN101854122B CN 201010150897 CN201010150897A CN101854122B CN 101854122 B CN101854122 B CN 101854122B CN 201010150897 CN201010150897 CN 201010150897 CN 201010150897 A CN201010150897 A CN 201010150897A CN 101854122 B CN101854122 B CN 101854122B
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Abstract
The invention discloses a high-voltage inverted low-voltage chopped-mode welding power supply which is formed by connecting a direct-current power supply with a push-pull type inverter circuit, a transformer and a full-wave rectification circuit in series in sequence, wherein one output end of the full-wave rectification circuit is connected with the input end of a chopper, and the other output end of the full-wave rectification circuit is connected with the input end of a filtering unit. The invention not only reduces the manufacture cost and the power dissipation of the inverted welding power supply, but also improves the reliability, the stability and the dynamic characteristic of the work of the inverted welding power supply.
Description
Technical field
What the present invention relates to is a kind of high power welding power supply for electric welding machine, relates in particular to a kind of novel high power contravariant source of welding current main circuit topology.
Background technology
At present, inverter welding power source has little, the lightweight and energy-efficient characteristics of volume with respect to non-inverter welding power source, and its main cause is as follows:
The volume and weight of common non-inversion welding source mainly concentrates on transformer and the reactor, and the two proportion can reach more than 80%.When design of transformer, following relation is arranged:
U∝kfNB
mS (1)
K-constant (relevant with the transformer primary side voltage form)
U-is applied to the voltage (V) on the transformer primary side winding
F-reverse frequency (Hz)
The number of turn of the former limit of N-winding
B
m-work magnetic flux density (T) (size is relevant with the core material of transformer)
S-magnetic core net sectional area (cm2)
Get according to formula 1, behind voltage U, output voltage and magnetic core of transformer material decision, reverse frequency f and turn number N and magnetic core interface S product are inversely proportional to, when f increases greatly, NS will reduce greatly, the volume and weight of transformer also will reduce greatly, and the volume and weight of corresponding transformer out put reactor also reduces greatly.(the inversion welding source reverse frequency is generally 20KHz because the reverse frequency of inversion welding source is higher than power frequency far away, power frequency is 50Hz), so, the volume and weight of the transformer of inversion welding source can reduce greatly, reverse frequency is higher, and it is more that the volume and weight of transformer reduces.This shows, greatly reducing of the volume of transformer and reactor, weight will reduce the volume and weight of whole inversion welding source itself greatly.
The transformer of inversion welding source and the volume of reactor, weight have all reduced greatly, and corresponding iron loss (magnetic loss unshakable in one's determination) and copper loss (wire loss) also reduce thereupon; Because reverse frequency is high, the energising cycle is short again, and the exciting current of transformer is very little; Most of device for power switching work on off state, and are less with the power consumption of the power device of emulation mode than work.Therefore, the efficient of inversion welding source is high, saves energy.At present, the inverter of the high power contravariant source of welding current both domestic and external adopts the full-bridge inverting pattern mostly, but the defective of this scheme is: (1) not only wants the in real time dynamic driving signal of regulating four power switch pipes, and to realize mutual isolation between the driving signal, control circuit is complicated, and reliability is lower; (2) the ripple phenomenon may appear losing in the driving signal of power switch pipe under underloading or Light Condition; (3) adopt four high-voltage circuit breaker pipes, not only increased the manufacturing cost of the source of welding current, and caused larger power consumption.
Summary of the invention
The objective of the invention is for the inversion welding source under the full-bridge inverting pattern owing to controlling in real time simultaneously 4 deficiencies that power switch pipe is opened or turn-offed, proposed a kind of novel inversion welding source main circuit topology, this inversion welding source main circuit mainly is comprised of prime push-pull circuit inverter and rear class DC chopper two parts.
The present invention adopts following technical scheme for achieving the above object:
High-voltage inverted low-voltage chopped-mode welding power supply of the present invention, the described source of welding current is connected in series successively push-pull inverter, transformer, full-wave rectifying circuit by DC power supply and consists of, the input of full-wave rectifying circuit output termination chopper wherein, the input of another output termination filtering unit of full-wave rectifying circuit.
Described push-pull inverter is made of IGBT1, two power switch pipes of IGBT2, the emitter of power switch pipe IGBT1 and IGBT2 connects respectively the negative pole of DC power supply, the collector electrode of power switch pipe IGBT1 connects the Same Name of Ends of transformer primary side winding, the collector electrode of power switch pipe IGBT2 connects the different name end of transformer primary side winding, parasitic diode in parallel respectively between the collector electrode of power switch pipe IGBT1 and IGBT2 and the emitter.
Also distinguish RC capacitance-resistance filter network in parallel between the collector electrode of described power switch pipe IGBT1 and IGBT2 and the emitter.
Described filtering unit is made of filter reactor L1, sustained diode 3, Hall element FL and capacitor C 6, C7, another output of the input termination full-wave rectifying circuit of Hall element FL wherein, the output of Hall element FL connects respectively the end of filter reactor L1 and the anode of sustained diode 3, the negative electrode of sustained diode 3 connects respectively the output of chopper and an end of capacitor C 6, the other end of capacitor C 6 is connected ground connection with an end of capacitor C 7, the other end of another termination filter reactor L1 of capacitor C 7.
Described full-wave rectifying circuit is one or more groups.
Advantage of the present invention is:
(1) the present invention simplifies the inversion welding source main circuit structure, default two high-voltage circuit breaker pipes, and only increase a low-voltage power switch pipe, not only reduce the manufacturing cost of inversion welding source, and reduced the power consumption of inversion welding source.
(2) the present invention makes the drive circuit of inversion welding source become simple, the driving signal of inversion welding source power switch pipe is changed into by original mutual isolation does not need mutual isolation, reduce the possibility of power switch pipe scaling loss, improved the reliability and stability of inversion welding source work.
(3) the present invention makes the external characteristic control circuit of inversion welding source become simple, the external characteristic of inversion welding source by four power switch pipes of original control turn on and off realize changing into only control a power switch pipe turn on and off realize, not only improve the reliability and stability of inversion welding source work, and improved the dynamic characteristic of inversion welding source.
Description of drawings
Fig. 1 main circuit diagram of the present invention.
Fig. 2 is the full-bridge inverting source of welding current main circuit diagram in the background technology.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
As shown in Figure 1, the present invention has unique main circuit topological structure, main circuit prime direct current 540V positive pole is connected to the former limit of main transformer centre cap, upper end, the former limit of main transformer is connected to the IGBT1 collector electrode that withstand voltage is 1600V, withstand voltage is that the IGBT1 emitter of 1600V is connected to direct current 540V negative pole, lower end, the former limit of main transformer is connected to the IGBT2 collector electrode that withstand voltage is 1600V, withstand voltage is that the IGBT2 emitter of 1600V is connected to direct current 540V negative pole, resistance is that R1 one end of 10R/2W is connected to the IGBT1 emitter that withstand voltage is 1600V, resistance is that the R1 other end of 10R/2W is connected to C1 one end that electric capacity is 103/1600V, electric capacity is that the C1 other end of 103/1600V is connected to the collector electrode that withstand voltage is the IGBT1 of 1600V, in like manner, resistance is that R2 one end of 10R/2W is connected to the IGBT2 emitter that withstand voltage is 1600V, resistance is that the R2 other end of 10R/2W is connected to C2 one end that electric capacity is 103/1600V, and electric capacity is that the C2 other end of 103/1600V is connected to the collector electrode that withstand voltage is the IGBT2 of 1600V.The direct current 540V of prime is the equivalence value of three-phase 380V alternating current process three-phase commutation bridge, filter circuit, again direct current 540V is delivered to push-pull inverter.Push-pull inverter comprises IGBT1, two power switch pipes of IGBT2, two groups of voltage peak absorbing networks that R1, R2, C1 and C2 consist of and transformer primary side.The driving signal of IGBT1, two power switch pipes of IGBT2 be one group decide frequency, decide pulsewidth, phase difference is 180 ° of two-way PWM ripples.Because the existence of transformer primary side leakage inductance, the moment that power switch pipe turn-offs, IGBT collector electrode and emission rally produce larger due to voltage spikes, easily power switch pipe are caused damage, therefore, the RC capacitance-resistance filter network in parallel respectively at the two ends of two power switch pipes.The specific implementation process is as follows: when IGBT1 is open-minded, when IGBT2 turn-offed, the direct current of prime was anodal through the former limit of main transformer centre cap, the former limit of main transformer the first half, gets back to prime direct current negative pole through IGBT1 again; When IGBT1 turn-offs, when IGBT2 opens, the direct current of prime is anodal through the former limit of main transformer centre cap, the former limit of main transformer the latter half, get back to prime direct current negative pole through IGBT2 again, thereby dc inverter is become the square wave alternating-current electricity of certain frequency, the frequency of the party's alternating current wave, duty ratio and driving signal PWM wave frequency, duty ratio are identical, and the crest voltage of square wave alternating-current electricity is the magnitude of voltage at the positive and negative two ends of three phase rectifier module.
As shown in Figure 1, main circuit rear class main transformer secondary upper end is connected to the rectifier diode anode that model is D1MUR20040CT, model is that the rectifier diode negative electrode of D1MUR20040CT is connected to the collector electrode that withstand voltage is the IGBT3 of 600V, withstand voltage is the anode that the emitter of the IGBT3 of 600V is connected to source of welding current output, main transformer secondary lower end is connected to the anode that model is the rectifier diode D2 of D1MUR20040CT, model is that the negative electrode of the rectifier diode D2 of D1MUR20040CT is connected to the collector electrode that withstand voltage is the IGBT3 of 600V, main transformer secondary lower end is connected to the end that output filtering reactor inductance value is 55uH, output filtering reactor inductance value is the negative terminal that the other end of the L1 of 55uH is connected to source of welding current output, electric capacity is that C3 one end of 103/10KV is connected to the negative electrode that model is the rectifier diode D1 of MUR20040CT, electric capacity is that the C3 other end of 103/10KV is connected to main transformer secondary centre cap, resistance is that R3 one end of 10R/2W is connected to the collector electrode that withstand voltage is the IGBT3 of 600V, resistance is that the other end of the R3 of 10R/2W is connected to the end that electric capacity is the C4 of 2.2n/2KV, electric capacity is that the other end of the C4 of 2.2n/2KV is connected to main transformer secondary centre cap, model is that the negative electrode of the sustained diode 3 of MUR20040CT is connected to the emitter that withstand voltage is the IGBT3 of 600V, model is that the anode of the sustained diode 3 of MUR20040CT is connected to main transformer secondary centre cap, electric capacity is that C6 one end of 103/10KV is connected to source of welding current output plus terminal, electric capacity is that the C6 other end of 103/10KV is connected to C7 one end that electric capacity is 103/10KV, electric capacity is that the other end of the C7 of 103/10KV is connected to source of welding current output negative terminal, electric capacity is that the C6 of 103/10KV is connected the connection termination source of welding current casing of the C7 of 103/10KV with electric capacity, resistance is that R4 one end of 10R/2W is connected to the collector electrode that withstand voltage is the IGBT3 of 600V, resistance is that the R4 other end of 10R/2W is connected to C5 one end that electric capacity is 2.2n/2KV, electric capacity is that the other end of the C5 of 2.2n/2KV is connected to the emitter that withstand voltage is the IGBT3 of 600V, and the major loop of the source of welding current passes the induction coil of Hall element FL.Rear class is by the main transformer secondary, the full-wave rectifying circuit that D1 and D2 consist of, and the filtering unit that R3, C3 and C4 consist of, chopper IGBT3, filter reactor L1, the filtering unit that sustained diode 3, Hall element FL and C6, C7 consist of forms.The specific implementation process is as follows: the square wave alternating-current electricity that former limit push-pull inverter forms decides frequency, decide pulsewidth is transferred to secondary by main transformer, then be rectified into the direct current of pulsation by full-wave rectifying circuit, form level and smooth direct voltage through C3, C4, R3 filtering, then by regulating in real time the duty ratio that chopper IGBT3 drives signal, the effective value of regulation output voltage, thereby external characteristic and the dynamic characteristic of realization inversion welding source.When chopper IGBT3 turn-offed, filter reactor L1 and sustained diode 3 played the welding current continuity effect of keeping.
Claims (2)
1. high-voltage inverted low-voltage chopped-mode welding power supply, it is characterized in that: the described source of welding current is connected in series successively push-pull inverter, transformer, full-wave rectifying circuit by DC power supply and consists of, the input of an output termination chopper of wherein said full-wave rectifying circuit, the input of another output termination filtering unit of full-wave rectifying circuit; Described filtering unit is made of filter reactor L1, sustained diode 3, Hall element FL and capacitor C 6, C7, another output of the input termination full-wave rectifying circuit of Hall element FL wherein, the output of Hall element FL connects respectively the end of filter reactor L1 and the anode of sustained diode 3, the negative electrode of sustained diode 3 connects respectively the output of chopper and an end of capacitor C 6, the other end of capacitor C 6 is connected ground connection with an end of capacitor C 7, the other end of another termination filter reactor L1 of capacitor C 7.
2. according to right 1 described high-voltage inverted low-voltage chopped-mode welding power supply, it is characterized in that: described push-pull inverter is made of IGBT1, two power switch pipes of IGBT2, the emitter of power switch pipe IGBT1 and IGBT2 connects respectively the negative pole of DC power supply, the collector electrode of power switch pipe IGBT1 connects the Same Name of Ends of transformer primary side winding, the collector electrode of power switch pipe IGBT2 connects the different name end of transformer primary side winding, parasitic diode in parallel respectively between the collector electrode of power switch pipe IGBT1 and IGBT2 and the emitter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010150897 CN101854122B (en) | 2010-04-15 | 2010-04-15 | High-voltage inverted low-voltage chopped-mode welding power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010150897 CN101854122B (en) | 2010-04-15 | 2010-04-15 | High-voltage inverted low-voltage chopped-mode welding power supply |
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| CN101854122A CN101854122A (en) | 2010-10-06 |
| CN101854122B true CN101854122B (en) | 2013-04-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102148565B (en) * | 2011-03-28 | 2014-03-26 | 株洲变流技术国家工程研究中心有限公司 | Current quick shifting method and direct current power supply |
| CN103973153A (en) * | 2013-02-05 | 2014-08-06 | 新疆大学 | High-power numerical control pulse frequency modulation power supply of electric arc cutting machine tool |
| CN105790593A (en) * | 2014-12-25 | 2016-07-20 | 广东太阳库新能源科技有限公司 | MCU-controlled push-pull boosted circuit |
| CN105628214A (en) * | 2016-02-06 | 2016-06-01 | 蚌埠市龙泰消防药剂有限公司 | Device for increasing detection distance of ultraviolet flame sensor |
| CN106425027B (en) * | 2016-07-13 | 2018-08-10 | 苏州新逸喆电子科技有限公司 | A kind of current control module for wireless electric welding machine |
| CN112737395B (en) * | 2020-12-25 | 2022-05-20 | 西安交通大学 | Bipolar all-solid-state LTD square wave pulse generating circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| CN101391340A (en) * | 2008-11-05 | 2009-03-25 | 江苏科技大学 | Air plasma cutting machine |
| CN201750342U (en) * | 2010-04-15 | 2011-02-16 | 江苏科技大学 | High-voltage inversion and low-voltage chopping type welding power supply |
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2010
- 2010-04-15 CN CN 201010150897 patent/CN101854122B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1479440A (en) * | 2002-06-05 | 2004-03-03 | 欧姆龙株式会社 | Transforming device of push-pull circuit type |
| CN101391340A (en) * | 2008-11-05 | 2009-03-25 | 江苏科技大学 | Air plasma cutting machine |
| CN201750342U (en) * | 2010-04-15 | 2011-02-16 | 江苏科技大学 | High-voltage inversion and low-voltage chopping type welding power supply |
Non-Patent Citations (1)
| Title |
|---|
| 李天喆.逆变式弧焊电源的研究与开发.《广东有色金属学报》.2005,第15卷(第4期),第55-58页. * |
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