CN100459399C - Power supply unit - Google Patents
Power supply unit Download PDFInfo
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- CN100459399C CN100459399C CNB2003101179928A CN200310117992A CN100459399C CN 100459399 C CN100459399 C CN 100459399C CN B2003101179928 A CNB2003101179928 A CN B2003101179928A CN 200310117992 A CN200310117992 A CN 200310117992A CN 100459399 C CN100459399 C CN 100459399C
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- 238000009499 grossing Methods 0.000 claims abstract description 65
- 239000003990 capacitor Substances 0.000 claims abstract description 36
- 238000004804 winding Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000003466 welding Methods 0.000 abstract description 50
- 238000010891 electric arc Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 230000008929 regeneration Effects 0.000 description 10
- 238000011069 regeneration method Methods 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 8
- 230000001172 regenerating effect Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The input rectifier (4), the smoothing capacitor (6), the inverter (8), the transformer (10) and the output rectifier (10) convert the AC voltage into DC voltage. The DC voltage is connected to the workpiece and the welding torch via the AC converter (16). After the AC voltage to the workpiece and the welding torch is changed from positive to negative, the auxiliary power supply (28) provides negative voltage with negative peak value greater than the negative peak value of the AC voltage. By means of transformer (30), rectifier (32) and smoothing capacitor (36), the auxiliary power supply (28) generates DC voltage with negative peak greater than the negative peak value of the AC voltage. The smoothing capacitor (36) is connected to the workpiece and the welding via transistor (38) and limiting resistor (40). The differential circuit (46) with resistor (48) in lower resistance is connected to the limiting resistor (40) in parallel.
Description
Technical field
The present invention relates to the supply unit of ac arc wedling machine, or rather, relate to the supply unit of the alternating voltage that uses direct voltage conversion generation.
Background technology
Fig. 1 represents the example of the existing power supply device that uses with ac arc wedling machine.Supply unit shown in Figure 1 has voltage input end 2a, 2b and 2c, and input links to each other with alternating current such as three-phase industry alternating current (not shown).Voltage input end 2a-2c links to each other with input rectification circuit 4.Input rectification circuit 4 link to each other to first alternating voltage (as, from the three-phase industry alternating voltage of three-phase industry alternating current) carry out rectification, produce commutating voltage.6 pairs of commutating voltages of smmothing capacitor carry out smoothing processing, become direct voltage.Synthetic direct voltage is applied to the direct current high-frequency converter,, is converted to high frequency voltage as high-frequency inverter 8.High-frequency inverter 8 has many semiconductor switch equipment, as IGBT, and bipolar transistor or FET (not shown).The conducting period of inverter control circuit 9 control semiconductor switch equipment.To be applied to have the elementary winding 10P of the transformer 10 of secondary winding 10S from the high frequency voltage of inverter 8, thereby cause the high frequency supercharging.Diode 12a, 12b, 12c and the 12d of output rectification circuit 12 carry out rectification to the high frequency supercharging.Between positive output end 12P and negative output terminal 12N, generate commutating voltage. Smoothing reactor 14a and 14b carry out smoothing processing to commutating voltage, generate main direct voltage.Therefore, input rectification circuit 4, smmothing capacitor 6, inverter 8, transformer 10, output rectification circuit 12 and smoothing reactor 14a and 14b constitute DC power supply.
To be applied to DC-AC converter 16 from the main direct voltage of DC power supply, the latter generates second alternating voltage according to main direct voltage.Via the output 17A and the 17B of supply unit, second alternating voltage is applied in the load between workpiece 18 and the welding torch 20.DC-AC converter 16 has a semiconductor switch equipment, as IGBT 22a, links to each other with the positive output end 12P of output rectification circuit 12 by smoothing reactor 14a.Especially,, the collector electrode of IGBT 22a is connected to positive output end 12P, the emitter of IGBT 22a is connected to workpiece 18 by smoothing reactor 14a.Equally, DC-AC converter 16 has a semiconductor switch IGBT 22b, links to each other with the negative output terminal 12N of output rectification circuit 12 by smoothing reactor 14b.Especially,, the emitter of IGBT 22b is connected to negative output terminal 12N, the collector electrode of IGBT 22b is connected to workpiece 18 by smoothing reactor 14b.Transformer 10 has a centre tap 10T on secondary winding 10S.Centre tap 10T is connected to welding torch 20.Inverse parallel diode 24a and 24b are parallel on each emitter collector electrode conductive path of IGBT 22a and 22b.
With preset frequency (as, tens hertz to the hundreds of hertz), exchange conversion control circuit 26 from direct current and apply control signal to the grid of IGBT 22a and 22b, make alternately conduction of IGBT 22a and 22b.For example, when IGBT 22a conducts electricity, in the time limit Tpe shown in Fig. 2 A, the positive polarity electric current from positive output end 12P via smoothing reactor 14a, IGBT 22a, workpiece 18 and welding torch 20.Arrive centre tap 10T.On the contrary, when IBGT 22b conducts electricity, in time limit Tne, the negative polarity electric current from middle tap 10T via welding torch 20, workpiece 18, IBGT 22b and smoothing reactor 14b arrive negative output terminal 12.Like this, between workpiece 18 and welding torch 20, produce the alternating current arc that is used to weld.
At this moment, if welding current less than 50A, the energy shortage of laying among smoothing reactor 14a and the 14b then, even the waveform of welding current is the rectangle shown in Fig. 2 A, therefore, when welding current when positive polarity becomes negative polarity, the electric arc of can not regenerating between welding torch 20 and the workpiece 18 sometimes.In the above description, the term " regeneration " of uniting use with electric arc means the fast rapid regeneration of electric arc, after welding current becomes negative pole, in welding current extinguish arcs immediately when positive pole changes negative pole into.
In order to help the regeneration of electric arc, be used to provide another power supply 28 of stack electric arc regenerative voltage.Stack power supply 28 comprises a booster transformer 30, and its elementary winding 30P is connected between power input 2a and the 2b, with the reception alternating voltage, thereby causes the supercharging alternating voltage on the secondary winding 30S of transformer 30.Utilize 32 pairs of supercharging alternating voltages of rectifier to carry out rectification, utilize the combination of resistance 34 and electric capacity 36 to carry out smoothing processing, to form direct voltage.Transformer 30, rectifier 32, resistance 34 and electric capacity 36 constitute stack power supply 28, and it is known as accessory power supply 28 sometimes in this manual.
During exchanging the negative polarity of weldingvoltage, come the peak value of direct voltage of the combination of self-resistance 34 and electric capacity 36, greater than the negative peak of the voltage between workpiece 18 and the welding torch 20.By semiconductor switch circuit, as bipolar transistor 18, the tandem compound of current-limiting resistance 40 and IGBT 22b applies direct voltage between welding torch 20 and workpiece 18, and wherein workpiece 18 is anodal, and welding torch 20 is a negative pole.More precisely, when IGBT 22b conducts electricity, apply direct voltage, thereby workpiece 18 is a negative pole, welding torch 20 is anodal.By making bipolar transistor 38 conductions, apply direct voltage.The control signal of utilizing the base stage of superimposed voltage control circuit 42 bidirectional bipolar transistors 38 to apply, the conducting period of control bipolar transistor 38, wherein when direct current exchanged the control signal of conversion control circuit 26 generation reproduction IGBT 22, superimposed voltage control circuit 42 beginning bidirectional bipolar transistors 38 provided control signal.It is shorter for negative time bar than weldingvoltage that bidirectional bipolar transistor 38 applies the time bar of control signal.The tandem compound that connects diode 44 and current-limiting resistance 40 and bipolar transistor 38 with parallel way.When the input voltage of DC-AC converter, i.e. voltage between centre tap 10T and the negative output terminal 12N, moment increases so that capacitor 36 when absorbing transient voltages, and diode 44 begins conduction.
When polarity was negative from just becoming, transistor 38 began conduction, and accessory power supply 28 provides the direct voltage shown in Fig. 2 B, to help regeneration electric arc.At this moment, because capacitor 36 and resistance 40 constitute an integrated circuit, so the direct voltage that capacitor 36 discharges raises gradually.
When workpiece 18 does not link to each other with 17B with output 17A with welding torch 20, the voltage that above-mentioned supply unit applies between output 17A and 17B will be higher than 200V, so that between workpiece 18 and welding torch 20, regenerate electric arc, obtain stable electric arc regeneration, need the above high pressure of 250V.Therefore, if when making the voltage step-down of input 2a-2c, then can not between workpiece 18 and welding torch 20, apply the voltage that is enough to obtain stable arc regeneration owing to variation in voltage.
Even the objective of the invention is to also can provide when little welding current is born from just becoming the supply unit of reliable regeneration electric arc.
Summary of the invention
Supply unit according to the present invention comprises a DC power supply, and this power supply provides voltage by first alternating voltage from industrial AC power is carried out rectification and smoothing processing.DC-AC converter will be converted to second alternating voltage that changes from the direct voltage of DC power supply between positive pole and negative pole, so that be applied in the load via the output of supply unit.The superimposed voltage power supply is prepared the negative superimposed voltage from AC power or DC power supply, so that be applied in the load.Second alternating voltage became the time bar that negative polarity and its time bar keep less than second alternating voltage limitting in the negative polarity from positive polarity in, the superimposed voltage power supply changed fast from the peak value of its peak value greater than the negative peak of second alternating voltage.The superimposed voltage power supply comprises: the boost voltage power supply of direct voltage is provided, and its peak value is greater than the negative peak of second alternating voltage; Conduct electricity in the time limit that switching device, this device kept less than second alternating voltage limitting in the negative polarity in its time limit; And the current-limiting resistance that is connected in series with switching device.When switching device conducted electricity, the superimposed voltage power supply made the electric current of boost voltage power supply flow through switching device, the output of current-limiting resistance and supply unit.Connect differential circuit and current-limiting resistance with parallel way.Differential circuit comprises the resistance of its resistance value less than the resistance value of current-limiting resistance.
By the supply unit that adopts above-mentioned structure, when second alternating voltage that is applied to weld load when positive pole becomes negative pole, apply following negative voltage from the superimposed voltage power supply to weld load, promptly begin fast-changing negative voltage greater than the peak value of the negative peak of second alternating voltage, so that at second alternating voltage regeneration electric arc when positive polarity becomes negative polarity from its peak value.When switching device conducted electricity, electric current was by differential circuit, and differential circuit comprises the resistance of its resistance value less than the resistance value of current-limiting resistance, thereby applies big voltage to weld load.If do not use differential circuit, then electric current will be by current-limiting resistance, thereby can not apply big voltage to weld load.Compare with only using current-limiting resistance, can apply bigger voltage to weld load, even owing to the variation in voltage of DC power supply or AC power causes that the boost voltage power source voltage descends by using differential circuit.Therefore, the regeneration of electric arc is secure.
Differential circuit preferably includes the tandem compound of capacitor and resistance.Keep less than switching device can being full of the capacitance of capacitor in the time limit of conduction state in its time limit.When switching device conducts electricity, capacitor is charged, after finishing charging, apply voltage to weld load by current-limiting resistance.
The boost voltage power supply comprises a smmothing capacitor that is positioned at output.For comprising smmothing capacitor but do not comprise the boost voltage power supply of differential circuit, smmothing capacitor and current-limiting resistance constitute an integrated circuit, and therefore, the voltage that is applied to weld load increases gradually.On the other hand,, use above differential circuit, apply electric charge on the smmothing capacitor to weld load by differential circuit according to the present invention.Therefore, being applied to the voltage of weld load can fast rise.
DC power supply can be AC/DC changeover switch, and the latter receives first alternating voltage, then first alternating voltage is converted to direct voltage.When using AC/DC changeover switch, the effect of boost voltage power supply is that first alternating voltage is converted to the direct voltage of its peak value greater than the negative peak of second alternating voltage.As selection, the boost voltage power supply can be stepup transformer, and its effect is that the direct voltage that DC power supply provides is boosted.
The boost voltage power supply comprises rectification of boost voltage power input and smoothing circuit, is used for first alternating voltage is carried out rectification and smoothing processing, to generate direct voltage.Utilize boost voltage power supply high-frequency inverter that the direct voltage that generates is converted to high frequency voltage.Utilize boost voltage power supply high frequency transformer that the high frequency voltage that generates is boosted, utilize rectification of boost voltage power output end and smoothing circuit then carrying out rectification and smoothing processing through the high frequency voltage that boosts.By above-mentioned structure, because the employing of boost voltage power supply is small-sized, light, high frequency transformer carries out pressurized treatment efficiently, so supply unit is small-sized, light generally.
DC power supply comprises input rectification and smoothing circuit, and this circuit carries out rectification and smoothing processing to first alternating voltage, to form direct voltage.Utilize high-frequency inverter that the direct voltage that generates is converted to high frequency voltage.Utilize high frequency transformer that the high frequency voltage that generates is boosted, utilize output rectification and smoothing circuit carrying out rectification and smoothing processing through the high frequency voltage that boosts.The boost voltage power supply comprises the boost voltage power supply high-frequency inverter that links to each other with smoothing circuit with the input rectification, is used for the direct voltage of the rectification of input and smoothing circuit is converted to the direct voltage of boost voltage power supply.Utilize boost voltage power supply high frequency transformer that high frequency voltage is boosted then, utilize rectification of boost voltage power output end and smoothing circuit carrying out rectification and smoothing processing through the high frequency voltage that boosts.
The boost voltage power supply comprises a boost voltage power supply high frequency transformer, and this transformer links to each other with the DC power supply high-frequency inverter, and the high frequency voltage of high-frequency inverter is boosted.Utilize rectification of boost voltage power output end and smoothing circuit to carrying out rectification and smoothing processing through the high frequency voltage that boosts.
The DC power supply high frequency transformer comprises first and second secondary winding, wherein boosts by the high frequency voltage to high-frequency inverter, generates first and second high frequency voltages that boost respectively.Utilize dc power output end rectification and smoothing circuit that the high frequency voltage that boosts that first secondary winding causes is carried out rectification and smoothing processing.The boost voltage power supply comprises rectification of boost voltage power output end and smoothing circuit, and this circuit carries out rectification and smoothing processing to the high frequency voltage that boosts that the second subprime winding of DC power supply high frequency transformer causes.
Description of drawings
Fig. 1 is existing arc welding power supply manipulated or operated apparatus.
Fig. 2 A and 2B represent the voltage waveform that supply unit shown in Figure 1 occurs at each point.
Fig. 3 is the circuit diagram of the supply unit of first execution mode according to the present invention.
Fig. 4 A and 4B represent the voltage waveform of the each point in the supply unit shown in Figure 3.
Fig. 5 is the circuit diagram of the supply unit of second execution mode according to the present invention.
Fig. 6 is the circuit diagram of the supply unit of the 3rd execution mode according to the present invention.
Fig. 7 is the circuit diagram of the supply unit of the 4th execution mode according to the present invention.
Fig. 8 is the circuit diagram of the supply unit of the 5th execution mode according to the present invention.
Fig. 9 is the circuit diagram of the supply unit of the 6th execution mode according to the present invention.
Figure 10 is the circuit diagram of the supply unit of the 7th execution mode according to the present invention.
Figure 11 is the circuit diagram of the supply unit of the 8th execution mode according to the present invention.
Figure 12 is the circuit diagram of the supply unit of the 9th execution mode according to the present invention.
Figure 13 is the circuit diagram of the supply unit of the tenth execution mode according to the present invention.
Figure 14 is the circuit diagram of the supply unit of the 11 execution mode according to the present invention.
Figure 15 is the circuit diagram of the supply unit of the 12 execution mode according to the present invention.
Embodiment
Supply unit according to the present invention's shown in Figure 3 first execution mode comprises differential circuit 46, and the latter links to each other with current-limiting resistance 40 shown in Figure 1 with parallel way.The remainder of supply unit shown in Figure 3 is identical with the structure of power circuit shown in Figure 1, and the used reference number of the reference number that same components or function are used and Fig. 1 is identical, and repeats no more.In institute's drawings attached, reference number and the symbol identical with symbol with reference number shown in Figure 1 are represented assembly and the function identical with function with assembly shown in Figure 1.
By structure shown in Figure 3, the voltage that applies between workpiece 18 and welding torch 20 becomes negative pole at moment t1 by positive pole, shown in Fig. 4 A, thereby makes transistor 38 conductions.Therefore, via transistor 38, resistance 48, capacitor 50 and IGBT 22b offer workpiece 18 and welding torch 20 with the electric charge on the capacitor 36.Because the resistance value of resistance 48 is less than the resistance value of current-limiting resistance 40, so current flowing resistance 48 and capacitor 50, the voltage that apply between workpiece 18 and the welding torch 20 this moment is higher than the voltage that applies via current-limiting resistance 40, and wherein the circuit at current-limiting resistance 40 places does not comprise differential circuit 46.Therefore,, then can between workpiece 18 and welding torch 20, apply high voltage, thereby guarantee regeneration electric arc when welding current becomes negative pole by positive pole if the voltage that voltage input end 2a-2c applies reduces owing to the variation in voltage of industrial AC power.Finish charging to capacitor 50 in its time limit in time limit less than the conduction of transistor 38, after this, welding current is by differential circuit 46, but by current-limiting resistance 40.Fig. 4 B represents the waveform of the voltage that supply unit shown in Figure 3 applies between workpiece 18 and welding torch 20.The peak value of voltage be 300V to 400V, the duration is that 300 μ s are to 400 μ s.By the waveform shown in the waveform shown in the comparison diagram 4B and Fig. 2 B as can be seen, supply unit shown in Figure 3 can provide higher voltage between workpiece 18 and welding torch 20.Therefore, when welding current when positive polarity becomes negative polarity, the supply unit of the present invention electric arc of can reliably regenerating.
Fig. 5 represents the supply unit of second execution mode according to the present invention, wherein has the DC-AC converter 16 of the DC-AC converter 16a of full bridge structure as supply unit shown in Figure 3.
DC-AC converter 16a comprises semiconductor switch equipment, as IGBT 122a, and 122b, 122c and 122d.Connect IGBT 122a and 122c collector emitter conductive path with series system, connect IGBT 122b and 122d collector emitter conductive path with series system.Connect above two tandem compounds with parallel way.By reactor 14, the output voltage of output rectification circuit 12 is applied in the combination in parallel.Tie point between IGBT 122b and the 122d is connected to welding torch 20, the tie point between IGBT 122a and the 122c is connected to workpiece 18.The collector emitter conductive path that connects free- wheel diode 124a, 124b, 124c and 124d and IGBT 122a-122d in the inverse parallel mode.
When IGBT 122a and 122d conduction, between workpiece 18 and welding torch 20, apply voltage, wherein workpiece 18 is a negative pole for positive pole welding torch 20.When IGBT 122b and 122d conduction, between workpiece 18 and welding torch 20, apply voltage, wherein workpiece 18 is anodal for negative pole welding torch 20.Like this, IGBT to 122a and 122d and IGBT to 122b and 122c conduction alternately, thereby between workpiece 18 and welding torch 20, apply voltage.
By transistor 38, current-limiting resistance 40 and differential circuit 46 are applied to the direct voltage at capacitor 36 two ends in the parallel connection combination of IGBT.When IGBT 122b and 122c conduction, make transistor 38 conduct electricity.
Fig. 6 represents the supply unit according to the 3rd execution mode.Supply unit shown in Figure 6 uses boost voltage power supply 28a, as comprise the stepup transformer 56 of reactor 52 and switching device (as bipolar transistor 54), replace superimposed voltage power supply 28, wherein superimposed voltage power supply 28 uses the step-up transformer 30 of the supply unit of second execution mode shown in Figure 5.One end of reactor 52 is connected to the output 12P of output rectifier 12 by reactor 14a.The collector electrode of transistor 54 is connected to the other end of reactor 52, and is connected to the tie point between the collector electrode of smmothing capacitor 36 and transistor 38 by reverse blocking diode pipe 58.The other end of the emitter of transistor 54 and smmothing capacitor 36 is connected in the lump the negative output terminal 12N of output rectification circuit 12.With given interval, the drive signal of drive circuit (not shown) is applied to the base stage of transistor 54.When drive signal is on base stage, transistor 54 conductions.The remainder of supply unit is identical with supply unit shown in Figure 3.
When transistor 54 conduction of stepup transformer 56, electric current is by reactor 52 and transistor 54, thus in reactor 52 stored energy.When transistor 54 was non-conductive, the voltage that reactor 52 is caused was added on the voltage between output 12P and the 12N, thereby the voltage between output 12P and the 12N is boosted.
Fig. 7 represents the supply unit of the 4th execution mode according to the present invention, its circuit structure is identical with the structure of the supply unit of first execution mode shown in Figure 3, just this device uses boost voltage power supply 28a, the stepup transformer 56 that uses in the supply unit as shown in Figure 6 replaces superimposed voltage power supply 28.The remainder of this circuit is identical with supply unit shown in Figure 3.
Fig. 8 represents the supply unit of the 5th execution mode according to the present invention, and its circuit structure is identical with the structure of supply unit shown in Figure 3, only is to use boost voltage power supply 281 to replace superimposed voltage power supply 28 shown in Figure 3.The structure and the operation of boost voltage power supply 281 below only are described, and no longer describe remainder.
Utilize the smmothing capacitor 201 of boost voltage power supply 281, in input rectification circuit 101, the alternating voltage between ac power input end 2a and the 2b is carried out rectification and smoothing processing.Utilize high-voltage inverter 301 that the direct voltage that generates is converted to high frequency voltage, erect image high-frequency inverter 8 is the same, and inverter 301 is to be made of numerous semiconductor switching devices (as IGBT, bipolar transistor and FET).The control signal of utilizing inverter control circuit 601 to provide, the conduction time limit of control semiconductor switching device.Utilize the output high voltage of 401 pairs of high-frequency inverters 301 of high frequency transformer to boost, in output rectification circuit 501, handle carrying out rectification through the high frequency voltage that boosts.Utilize the voltage of resistance 34 and 36 pairs of generations of capacitor to carry out smoothing processing then.
The supply unit of first execution mode as shown in Figure 3 is such, with the direct voltage between just (+) output of boost voltage power supply 281 and negative (-) output as the superimposed voltage between workpiece 18 and the welding torch 20.By means of the high frequency transformer 401 as the step-up transformer of boost voltage power supply 281, supply unit has high efficiency, and small-sized, light.
Circuit structure according to the boost voltage power supply 282 of the supply unit of the present invention's shown in Figure 9 the 6th execution mode, identical with the structure of boost voltage power supply 281 shown in Figure 8, just remove the input rectification circuit 101 of boost voltage power supply 281, and the output voltage of input rectification circuit 4 is applied to high-frequency inverter 301.Rely on the capacitance of smmothing capacitor 6, can remove smmothing capacitor 201.As according to the supply unit of the 5th execution mode, owing to use high frequency transformer 401, thus have high efficiency according to the supply unit of the 6th execution mode, and small-sized, light.
Supply unit according to the present invention's shown in Figure 10 the 7th execution mode comprises boost voltage power supply 283, and the latter is similar with the boost voltage power supply 281 according to the supply unit of the 5th execution mode shown in Figure 8.The difference of boost voltage power supply 283 and boost voltage power supply 281 is not comprise the input rectification circuit 101 of boost voltage power supply 281, smmothing capacitor 201 or high-frequency inverter 301, and the elementary winding of the high frequency transformer 401 that will boost is connected to the output of the high-frequency inverter 8 of main power source.As the supply unit of the 5th or the 6th execution mode, owing to use high frequency transformer 401, so the supply unit of the 7th execution mode has higher running efficiency, and small-sized, light.
Figure 11 represents the supply unit of the 8th execution mode according to the present invention, and this device uses boost voltage power supply 284.Boost voltage power supply 284 is similar with boost voltage power supply 281 shown in Figure 8, is not comprise input rectification circuit 101, smmothing capacitor 201, high-frequency inverter 301 or the high frequency transformer 401 that boosts with the difference of boost voltage power supply 281.But except that the first elementary winding 10S, also to provide second subprime winding 10R for high frequency transformer 10.The high frequency voltage that in output rectification circuit 12 the first elementary winding 10S is caused carries out rectification, and the high frequency voltage that in the output rectification circuit 501 of boost voltage power supply 284 second subprime winding 10R is caused carries out rectification, utilize resistance 34 and capacitor 36 to carry out smoothing processing then, generate the required stack direct voltage of stack thus.As according to the supply unit of the 5th, the 6th, the 7th execution mode, owing to use the similar high frequency transformer 10 of step-up transformer with boost voltage power supply 284, so the supply unit according to the 8th execution mode has higher running efficiency, and volume is little in light weight.
Figure 12 represents the supply unit of the 9th execution mode according to the present invention, and this device uses the boost voltage power supply 281 that uses in the supply unit of the 5th execution mode shown in Figure 8.
Supply unit according to present embodiment uses the DC-AC converter 16a that uses in second execution mode shown in Figure 5.As with reference to supply unit explanation shown in Figure 5, when IGBT 122a and 122d conduction, between workpiece 18 and welding torch 20, apply voltage, wherein workpiece 18 is anodal, and welding torch 20 is a negative pole.When IGBT 122b and 122c conduction, between workpiece 18 and welding torch 20, apply voltage, wherein workpiece 18 is a negative pole, and welding torch 20 is anodal.Equally, IGBT to 122a and 122d and IGBT to 122b and 122c conduction alternately, thereby between workpiece 18 and welding torch 20, apply alternating voltage with waveform shown in Fig. 4 A.
At moment t1 (Fig. 4 B), bipolar transistor 38 conducts electricity in each period Tn e (Fig. 4 A), IGBT is to 122b and 122c conduction during this time, thereby on workpiece 18, apply negative voltage, and on welding torch 20, apply positive voltage, between workpiece 18 and welding torch 20, apply the DC stacked voltage that boost voltage power supply 281 produces.The peak value of superimposed voltage be 300V to 400V, be higher than the negative peak of the voltage that DC-AC converter 16a provides, and begin quick decline from peak value.Therefore, the electric arc of can regenerating really.As according to the supply unit of the 5th execution mode, owing to use boost voltage power supply 281, this supply unit has higher running efficiency, and small-sized, light.
Figure 13 represents the supply unit according to the tenth execution mode.This supply unit comprises the boost voltage power supply 281 that uses in the supply unit according to the 6th execution mode shown in Figure 9, and the DC-AC converter 16a that uses in second execution mode shown in Figure 5 and the 9th execution mode shown in Figure 12.
Figure 14 represents the another kind of supply unit according to the 11 execution mode, this device comprises the boost voltage power supply 283 that uses in the supply unit of the 7th execution mode shown in Figure 10, and the DC-AC converter 16a that uses in the supply unit of the 9th execution mode shown in Figure 12.
The supply unit of the present invention's shown in Figure 15 the 12 execution mode uses the boost voltage power supply 284 that uses in the supply unit of the 8th execution mode shown in Figure 11, and the boost voltage power supply 16a that uses in the supply unit of the 9th execution mode shown in Figure 12.
Supply unit according to the tenth to the 12 execution mode uses high frequency transformer as the booster voltage device in the boost voltage power supply, therefore have than higher running efficiency, and volume is little in light weight.
Although describe the present invention, also can in the supply unit of plasma arc welding machine, arc cutting machine, plasma arc cutter, charger, electroplanting device, embody the present invention, and can obtain same effect from arc welding power supply device aspect.
In the above-described embodiment,, between workpiece 18 and welding torch 20, apply voltage, but also can directly between workpiece 18 and welding torch 20, apply voltage from capacitor 36 by DC- AC converter 16a or 16.
Claims (9)
1. supply unit, this device comprises:
A DC power supply, this power supply will be converted to main direct voltage from first alternating voltage that exchanges power supply;
A DC-AC converter is used for described main direct voltage is converted to second alternating voltage that changes between positive pole and negative pole, via first and second outlet terminals of described supply unit, described second alternating voltage is added in the load;
A superimposed voltage power supply, generate the negative voltage that is added to described load by described first and second outlet terminals, become negative polarity from positive polarity and continue in the time bar that keeps less than described second alternating voltage limitting in the negative polarity at described second alternating voltage, generate described negative voltage, described negative voltage changes from negative peak, and its absolute value is greater than the absolute value of the negative peak of described second alternating voltage;
Described superimposed voltage power supply comprises: generate the boost voltage power supply of direct voltage, wherein the absolute value of the negative peak of direct voltage is greater than the absolute value of the described negative peak of described second alternating voltage; Switching device, this device kept less than described second alternating voltage conducting electricity in the limit in the negative polarity in the time limit; And the current-limiting resistance that is connected in series with described switching device;
When described switching device conducted electricity, the feasible electric current from described boost voltage power supply of described superimposed voltage power supply passed through described switching device, described current-limiting resistance and described first and second outlet terminals; And
With the differential circuit that parallel way is connected with described current-limiting resistance, described differential circuit comprises the resistance of its resistance value less than the resistance value of described current-limiting resistance.
2. according to the supply unit of claim 1, wherein said differential circuit comprises the tandem compound of described resistance and capacitor, the capacitance of described capacitor meets the following conditions, and keeps less than described switching device can finishing the charging to described capacitor in the time limit of conduction state in its time limit.
3. according to the supply unit of claim 1, wherein said boost voltage power supply is included in the smmothing capacitor of its output.
4. according to the supply unit of claim 1, wherein
Described DC power supply is an AC/DC changeover switch, and described first alternating voltage is imported as it, and described first alternating voltage is converted to described main direct voltage; And
Described boost voltage power supply is converted to described direct voltage with described first alternating voltage, and the absolute value of the negative peak of described direct voltage is greater than the absolute value of the described negative peak of described second alternating voltage.
5. according to the supply unit of claim 1, wherein said boost voltage power supply is a stepup transformer, is used for the direct voltage that described DC power supply provides is boosted.
6. according to the supply unit of claim 1, wherein said boost voltage power supply comprises:
Rectification of boost voltage power input and smoothing circuit carry out rectification and smoothing processing to described first alternating voltage, to generate direct voltage;
Boost voltage power supply high-frequency inverter, the described direct voltage that the rectification of described boost voltage power input and smoothing circuit are provided is converted to high frequency voltage;
Boost voltage power supply high frequency transformer boosts and exports the high frequency voltage that boosts described high frequency voltage; And
Rectification of boost voltage power output end and smoothing circuit carry out rectification and smoothing processing to the described high frequency voltage that boosts.
7. according to the supply unit of claim 1, wherein
Described DC power supply comprises:
Input rectification and smoothing circuit carry out rectification and smoothing processing to described first alternating voltage, to generate direct voltage;
High-frequency inverter, the described direct voltage with described input rectification and smoothing circuit provide is converted to first high frequency voltage;
High frequency transformer boosts and exports first high frequency voltage that boosts described first high frequency voltage; And
Output rectification and smoothing circuit carry out rectification and smoothing processing to described first high frequency voltage that boosts, to generate described main direct voltage; And
Described boost voltage power supply comprises:
The boost voltage power supply high-frequency inverter that is connected with smoothing circuit with described input rectification, the described direct voltage that described input rectification and smoothing circuit are provided is converted to second high frequency voltage;
Boost voltage power supply high frequency transformer, described second high frequency voltage that described boost voltage power supply high-frequency inverter is provided boosts; And
Rectification of boost voltage power output end and smoothing circuit, described second high frequency voltage that boosts that described boost voltage power supply high frequency transformer is provided carries out rectification and smoothing processing.
8. according to the supply unit of claim 1, wherein
Described DC power supply comprises:
Input rectification and smoothing circuit carry out rectification and smoothing processing to described first alternating voltage, to generate direct voltage;
High-frequency inverter, the described direct voltage with described input rectification and smoothing circuit provide converts high frequency voltage to;
High frequency transformer boosts and exports the high frequency voltage that boosts described high frequency voltage; And
Output rectification and smoothing circuit are to capable rectification of the described high frequency voltage that boosts and smoothing processing, to generate described main direct voltage; And
Described boost voltage power supply comprises:
The boost voltage power supply high frequency transformer that is connected with described high-frequency inverter, the described high frequency voltage that described high-frequency inverter is provided boosts; And
Rectification of boost voltage power output end and smoothing circuit, the described high frequency voltage that boosts that described boost voltage power supply high frequency transformer is provided carries out rectification and smoothing processing.
9. according to the supply unit of claim 1, wherein
Described DC power supply comprises:
Input rectification and smoothing circuit carry out rectification and smoothing processing to described first alternating voltage, to generate direct voltage;
High-frequency inverter, the described direct voltage that described input rectification and smoothing circuit are provided is converted to high frequency voltage;
High frequency transformer with elementary winding and first and second secondary winding, elementary winding receives described high frequency voltage from described high-frequency inverter, wherein the described high frequency voltage that described high-frequency inverter is provided boosts, and generates first and second high frequency voltages that boost respectively; And
Output rectification and smoothing circuit carry out rectification and smoothing processing to described first high frequency voltage that boosts that causes in described first secondary winding, to generate described main direct voltage; And
Described boost voltage power supply comprises:
Rectification of boost voltage power output end and smoothing circuit, described second high frequency voltage that boosts that causes in the described second subprime winding to described high frequency transformer carries out rectification and smoothing processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101179928A CN100459399C (en) | 2003-11-26 | 2003-11-26 | Power supply unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101179928A CN100459399C (en) | 2003-11-26 | 2003-11-26 | Power supply unit |
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| Publication Number | Publication Date |
|---|---|
| CN1622442A CN1622442A (en) | 2005-06-01 |
| CN100459399C true CN100459399C (en) | 2009-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101179928A Expired - Lifetime CN100459399C (en) | 2003-11-26 | 2003-11-26 | Power supply unit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545657B (en) * | 2010-12-21 | 2014-07-09 | 广东易事特电源股份有限公司 | Input rectification circuit for auxiliary power supply |
| CN105149748B (en) * | 2015-10-14 | 2017-08-25 | 刘昇澔 | A kind of alternating current-direct current consumable electrode welding machine |
| JP6743342B2 (en) * | 2017-04-21 | 2020-08-19 | 株式会社ダイヘン | Welding power supply |
| CN110239104B (en) * | 2019-05-05 | 2021-08-27 | 诸暨市逍遥管道科技有限公司 | Method for automatically compensating output voltage of direct current inversion electric fusion welding machine |
| CN117359072B (en) * | 2023-12-05 | 2024-02-02 | 深圳比斯特自动化设备有限公司 | Power supply safety protection circuit of spot welder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055650C (en) * | 1997-05-23 | 2000-08-23 | 陈广发 | Amplitude-modulated series-resonant inverting arc welding power source |
| CN1353027A (en) * | 2000-11-15 | 2002-06-12 | 株式会社三社电机制作所 | Power source apparatus of device using electric arc |
| JP2002345249A (en) * | 2001-05-16 | 2002-11-29 | Matsushita Electric Ind Co Ltd | Power supply |
-
2003
- 2003-11-26 CN CNB2003101179928A patent/CN100459399C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1055650C (en) * | 1997-05-23 | 2000-08-23 | 陈广发 | Amplitude-modulated series-resonant inverting arc welding power source |
| CN1353027A (en) * | 2000-11-15 | 2002-06-12 | 株式会社三社电机制作所 | Power source apparatus of device using electric arc |
| JP2002345249A (en) * | 2001-05-16 | 2002-11-29 | Matsushita Electric Ind Co Ltd | Power supply |
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| CN1622442A (en) | 2005-06-01 |
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