CN205629628U - Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine - Google Patents
Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine Download PDFInfo
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- CN205629628U CN205629628U CN201620101563.4U CN201620101563U CN205629628U CN 205629628 U CN205629628 U CN 205629628U CN 201620101563 U CN201620101563 U CN 201620101563U CN 205629628 U CN205629628 U CN 205629628U
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Abstract
The utility model provides a be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine, the setting is on the input DC power supply of the main circuit of IGBT contravariant welding machine. The utility model discloses a be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine can protect all IGBT on the IGBT contravariant welding machine effectively, has reduced the fault rate of IGBT contravariant welding machine, even a IGBT takes place to damage, can not lead to the damage of whole PCB circuit board yet, the the maintenance of IGBT contravariant welding machine cost is greatly reduced, security, the reliability of complete machine have been improved.
Description
Technical field
This utility model relates to a kind of current foldback circuit and IGBT inverter type welder, particularly relates to a kind of current foldback circuit being applied to IGBT inverter type welder and IGBT inverter type welder.
Background technology
Inversion is the concept contrary with rectification.Rectification is to be galvanic process convert alternating current, and inversion then makes unidirectional current change into the process of alternating current.The Arc Welding Power using inversion transformation technique is referred to as inverter type welder.Reversals needs high-power electronic switch device, uses insulated gate bipolar transistor IGBT to be referred to as IGBT inverter type welder as the inverter type welder of switching device.
The work process of IGBT inverter type welder is as follows: by three-phase or single phase industrial frequence AC rectification, a smoother unidirectional current is obtained after filtered, this unidirectional current is become the alternating current of tens KHz by the inverter circuit being made up of IGBT, after main transformer blood pressure lowering, more rectified filtering obtains stable direct current output welding current.
As it is shown in figure 1, the circuit overcurrent protection of existing IGBT inverter type welder is the input current being detected main circuit of the welding machine by the electric current on transformer sampling main transformer primary coil, to realize overcurrent protection.
But, existing current foldback circuit has a following deficiency:
(1) only overcurrent protection could be realized when short circuit occur in bis-rectifying part of commutation diode D1 and D2 on primary transformer coil T1 and teaser transformer；
(2) when IGBT G1, G2, G3 and the G4 on main transformer there being one punch through damage occurs, owing to IGBT inverter type welder is the most charged therefore overcurrent protection can be realized；But when power supply is turned off, when secondary turns back on, current transformer T2 can be caused over-current signal cannot to be detected because one of them IGBT punctures.As after IGBT G1 is breakdown, when again turning back on, the positive pole UI+ of input DC power can be made to be directly connected to IGBT G3 during IGBT G3 conducting, the demolition so that IGBT G3 is damaged.And now current transformer T2 the most just can't detect over-current signal, to such an extent as to overcurrent protection cannot be realized.This is because puncture short occurs in before current transformer T2, this is also the main cause occurring IGBT power device to blow up on IGBT inverter type welder；
(3) once occurring IGBT to blow up, the pcb board that may result in connection IGBT is scrapped, it is necessary to all changes whole PCB, causes maintenance cost too high, and have certain potential safety hazard.
Utility model content
The shortcoming of prior art in view of the above; the purpose of this utility model is to provide a kind of current foldback circuit being applied to IGBT inverter type welder and IGBT inverter type welder; current foldback circuit is arranged at positive pole or the negative pole of the input DC power of the main circuit of IGBT inverter type welder; before being i.e. arranged on IGBT G1, G2, G3 and G4 inversion; thus ensure that transformer is able to detect that the operating current of all IGBT constant power devices on main circuit, and it is effectively protected the reliability of IGBT inverter type welder by arranging overcurrent protection voltage.
For achieving the above object and other relevant purposes, this utility model provides a kind of current foldback circuit being applied to IGBT inverter type welder, on the input DC power of the main circuit being arranged on IGBT inverter type welder.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described in be applied to the current foldback circuit of IGBT inverter type welder be arranged on IGBT inverter type welder main circuit input DC power negative pole on.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: include that the transformer rectification module, trigger unit for thyristor and the PWM that are sequentially connected seal mode block.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described transformer rectification module includes current transformer, the full bridge rectifier being made up of four diodes, the first resistance and the second resistance and the 3rd resistance；Described current transformer is arranged between the negative pole of the input DC power of the main circuit of IGBT inverter type welder and the negative input of IGBT inverter type welder；Described full bridge rectifier second and the 4th outfan be connected in parallel on the two ends of described current transformer, the first output head grounding, the 3rd outfan is connected with one end of described first resistance, described second resistance and described 3rd resistance；Described first resistance and the other end ground connection of described second resistance；The other end of described 3rd resistance is connected with described trigger unit for thyristor.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described in be applied to the current foldback circuit of IGBT inverter type welder be arranged on IGBT inverter type welder main circuit input DC power positive pole on.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: include that the transformer rectification module, trigger unit for thyristor and the PWM that are sequentially connected seal mode block.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described transformer rectification module includes current transformer, the full bridge rectifier being made up of four diodes, the first resistance and the second resistance and the 3rd resistance；Described current transformer is arranged between the positive pole of the input DC power of the main circuit of IGBT inverter type welder and the electrode input end of IGBT inverter type welder；Described full bridge rectifier second and the 4th outfan be connected in parallel on the two ends of described current transformer, the first output head grounding, the 3rd outfan is connected with one end of described first resistance, described second resistance and described 3rd resistance；Described first resistance and the other end ground connection of described second resistance；The other end of described 3rd resistance is connected with described trigger unit for thyristor.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described trigger unit for thyristor includes the first stabilivolt, the 4th resistance and controllable silicon；The negative pole of described first stabilivolt is connected with described transformer rectification module, and positive pole is connected with one end and the described silicon controlled controlled stage of described 4th resistance；The other end of described 4th resistance and described silicon controlled minus earth；Described silicon controlled anode is connected with described PWM envelope mode block.
According to the above-mentioned current foldback circuit being applied to IGBT inverter type welder, wherein: described PWM envelope mode block includes the 5th diode, the second stabilivolt and the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, electric capacity and the first audion and the second audion；The negative pole of described 5th diode is connected with described trigger unit for thyristor, and positive pole is respectively connected with the positive pole of described second stabilivolt, described one end of 5th resistance and the positive pole of described electric capacity；The negative pole of described second stabilivolt is connected to the input voltage of described PWM envelope mode block through described 7th resistance；The other end of described 5th resistance is connected to the base stage of described first audion；The negative pole of described electric capacity one end with the base stage of described first audion and described 6th resistance respectively is connected；The other end ground connection of described 6th resistance；Described 8th resistance one end is connected to the input voltage of described PWM envelope mode block, and the other end is connected to the colelctor electrode of described first audion；The colelctor electrode of described first audion is connected to the base stage of described second audion；The equal ground connection of emitter stage of described first audion and described second audion；The colelctor electrode output PWM of described second audion seals ripple signal.
Meanwhile, the present invention also provides for a kind of IGBT inverter type welder, including IGBT inverter type welder body and any of the above-described described current foldback circuit being applied to IGBT inverter type welder.
As it has been described above, the current foldback circuit being applied to IGBT inverter type welder of the present utility model and IGBT inverter type welder, have the advantages that
(1) can effectively protect all IGBT on IGBT inverter type welder, reduce the fault rate of IGBT inverter type welder；
(2) even if an IGBT is damaged, the damage of whole PCB also it is not result in；
(3) greatly reduce the maintenance cost of IGBT inverter type welder, improve the safety of complete machine, reliability.
Accompanying drawing explanation
Fig. 1 is shown as in prior art being applied to the structural representation of the current foldback circuit of IGBT inverter type welder；
Fig. 2 is shown as the structural representation of a preferred embodiment of the current foldback circuit being applied to IGBT inverter type welder of the present utility model；
Fig. 3 is shown as the structural representation of another preferred embodiment of the current foldback circuit being applied to IGBT inverter type welder of the present utility model.
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art can be understood other advantages of the present utility model and effect easily by the content disclosed by this specification.This utility model can also be carried out by the most different detailed description of the invention or apply, and the every details in this specification can also carry out various modification or change based on different viewpoints and application under without departing from spirit of the present utility model.It should be noted that, in the case of not conflicting, the feature in following example and embodiment can be mutually combined.
It should be noted that, diagram provided in following example illustrates basic conception of the present utility model the most in a schematic way, component count, shape and size when only showing the assembly relevant with this utility model rather than implement according to reality in the most graphic are drawn, during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout kenel is likely to increasingly complex.
On the input DC power of the main circuit that the current foldback circuit of the IGBT of being applied to inverter type welder of the present utility model is arranged on IGBT inverter type welder; before IGBT G1, G2, G3 and G4 inversion; it is able to detect that the operating current of all IGBT constant power devices on main circuit, and effectively protects the reliability of IGBT inverter type welder by arranging overcurrent protection voltage.
In a preferred embodiment of the present utility model, as in figure 2 it is shown, on the negative pole of the current foldback circuit the being applied to IGBT inverter type welder input DC power that is arranged on the main circuit of IGBT inverter type welder.
With reference to Fig. 2, the current foldback circuit of the IGBT of being applied to inverter type welder of the present utility model includes that the transformer rectification module, trigger unit for thyristor and the PWM that are sequentially connected seal mode block.
Wherein, transformer rectification module includes current transformer T2, the full bridge rectifier being made up of four diodes (D3, D4, D5 and D6), the first resistance R1 and the second resistance R2 and the 3rd resistance R3.Wherein, current transformer T2 be arranged on IGBT inverter type welder main circuit input DC power negative pole and the negative input of IGBT inverter type welder between；Full bridge rectifier second and the 4th outfan be connected in parallel on the two ends of current transformer T2, the first output head grounding, one end of the 3rd outfan and the first resistance R1, the second resistance R2 and the 3rd resistance R3 is connected；First resistance R1 and the other end ground connection of the second resistance R2；The other end of the 3rd resistance R3 is connected with trigger unit for thyristor (negative pole of the i.e. first stabilivolt 1).
Trigger unit for thyristor includes the first stabilivolt W1, the 4th resistance R4 and controllable silicon Q1.The negative pole of the first stabilivolt W1 is connected with transformer rectification module (the i.e. the 3rd resistance R3), and the controlled stage of positive pole and one end of the 4th resistance R4 and controllable silicon Q1 is connected；The other end of the 4th resistance R4 and the minus earth of controllable silicon Q1；The anode of controllable silicon Q1 is connected with PWM envelope mode block (negative pole of the i.e. the 5th diode D7).
PWM envelope mode block includes the 5th diode D7, the second stabilivolt W2 and the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, electric capacity C1 and the first audion Q2 and the second audion Q3.The negative pole of the 5th diode D7 is connected with trigger unit for thyristor, and the positive pole of positive pole and the positive pole of the second stabilivolt W2, one end of the 5th resistance R5 and electric capacity C1 is respectively connected with；The negative pole of the second stabilivolt W2 is connected to the input voltage of PWM envelope mode block through the 7th resistance R7；The other end of the 5th resistance R5 is connected to the base stage of the first audion Q2；The negative pole of electric capacity C1 is connected with the base stage of the first audion Q2 and one end of the 6th resistance R6 respectively；The other end ground connection of the 6th resistance R6；8th resistance one end is connected to the input voltage of PWM envelope mode block, and the other end is connected to the colelctor electrode of the first audion Q2；The colelctor electrode of the first audion Q2 is connected to the base stage of the second audion Q3；The equal ground connection of emitter stage of the first audion Q2 and the second audion Q3；The colelctor electrode output PWM of the second audion Q3 seals ripple signal.
The operation principle of the most of the present utility model current foldback circuit that be applied to IGBT inverter type welder is described below.First, the input current signal of the input DC power negative pole of the main circuit of current transformer T2 sampling IGBT inverter type welder, after full bridge rectifier (D3-D6) rectification, obtain sampling voltage over the ground by the first resistance R1 and the second resistance R2.Wherein, the input current of the input DC power negative pole of main circuit is the biggest, and sampling voltage is the highest.Once main circuit has exception, current transformer to obtain sampling current to increase, cause sampling voltage also with increasing.Trigger controllable silicon Q1 to turn on over the ground when sampling voltage reaches the breakdown voltage of the first stabilivolt W1, drag down the base voltage of the first audion Q2 so that the first audion Q2 cut-off, the second audion Q3 turns on thus turns off pwm signal, makes main circuit quit work rapidly.Owing to controllable silicon Q1 once triggers the most irrecoverable, only power cutoff, reopen power supply and just can work on.If therefore the power device of main circuit damages; then an input current starting shooting the input DC power negative pole that can cause again main circuit increases; trigger protection circuit work again; thus avoid secondary start and damage the power device of main circuit, it is ensured that the safety of all IGBT and the reliability of complete machine on main circuit.
Wherein, in the case of the input current of the input DC power negative pole of main circuit is constant, the different values of R1 and R2, corresponding different sampling voltage.Therefore overcurrent protection voltage of the present utility model can be realized by the resistance choosing suitable R1 and R2
In another preferred embodiment of the present utility model; as shown in Figure 3; be applied to the current foldback circuit of IGBT inverter type welder be arranged on IGBT inverter type welder main circuit input DC power positive pole on, i.e. current transformer be arranged on IGBT inverter type welder main circuit input DC power positive pole and the electrode input end of IGBT inverter type welder between.Wherein, the particular circuit configurations of current foldback circuit being applied to IGBT inverter type welder is identical with the circuit structure in above-described embodiment and circuit theory, therefore does not repeats them here.
It should be noted that; no matter be applied to the current foldback circuit of IGBT inverter type welder be arranged on IGBT inverter type welder main circuit input DC power positive pole on or negative pole on; it all can detect that the operating current of all IGBT constant power devices on main circuit; thus significantly reduce the fault rate of IGBT inverter type welder, it is ensured that its safety and reliability.
It addition, this utility model also provides for a kind of IGBT inverter type welder, including IGBT inverter type welder body and the previously described current foldback circuit being applied to IGBT inverter type welder.Wherein, this current foldback circuit being applied to IGBT inverter type welder be arranged on IGBT inverter type welder main circuit input DC power negative or positive electrode on.
In sum, the current foldback circuit of the IGBT of being applied to inverter type welder of the present utility model and IGBT inverter type welder can protect all IGBT on IGBT inverter type welder effectively, reduce the fault rate of IGBT inverter type welder；Even if an IGBT is damaged, also it is not result in the damage of whole PCB；Greatly reduce the maintenance cost of IGBT inverter type welder, improve the safety of complete machine, reliability.So, this utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof, not for limiting this utility model.Above-described embodiment all can be modified under spirit and the scope of the present utility model or change by any person skilled in the art.Therefore, art has all equivalence modification or changes that usually intellectual is completed under without departing from the spirit disclosed in this utility model and technological thought such as, must be contained by claim of the present utility model.
Claims (2)
1. the current foldback circuit being applied to IGBT inverter type welder, it is characterised in that: on the input DC power of the main circuit being arranged on IGBT inverter type welder；
Mode block is sealed including the transformer rectification module being sequentially connected, trigger unit for thyristor and PWM；
Described transformer rectification module includes current transformer, the full bridge rectifier being made up of four diodes, the first resistance and the second resistance and the 3rd resistance；Described current transformer is arranged between the negative pole of the input DC power of the main circuit of IGBT inverter type welder and the negative input of IGBT inverter type welder；Described full bridge rectifier second and the 4th outfan be connected in parallel on the two ends of described current transformer, the first output head grounding, the 3rd outfan is connected with one end of described first resistance, described second resistance and described 3rd resistance；Described first resistance and the other end ground connection of described second resistance；The other end of described 3rd resistance is connected with described trigger unit for thyristor；
Described trigger unit for thyristor includes the first stabilivolt, the 4th resistance and controllable silicon；The negative pole of described first stabilivolt is connected with described transformer rectification module, and positive pole is connected with one end and the described silicon controlled controlled stage of described 4th resistance；The other end of described 4th resistance and described silicon controlled minus earth；Described silicon controlled anode is connected with described PWM envelope mode block；
Described PWM envelope mode block includes the 5th diode, the second stabilivolt and the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, electric capacity and the first audion and the second audion；The negative pole of described 5th diode is connected with described trigger unit for thyristor, and positive pole is respectively connected with the positive pole of described second stabilivolt, described one end of 5th resistance and the positive pole of described electric capacity；The negative pole of described second stabilivolt is connected to the input voltage of described PWM envelope mode block through described 7th resistance；The other end of described 5th resistance is connected to the base stage of described first audion；The negative pole of described electric capacity one end with the base stage of described first audion and described 6th resistance respectively is connected；The other end ground connection of described 6th resistance；Described 8th resistance one end is connected to the input voltage of described PWM envelope mode block, and the other end is connected to the colelctor electrode of described first audion；The colelctor electrode of described first audion is connected to the base stage of described second audion；The equal ground connection of emitter stage of described first audion and described second audion；The colelctor electrode output PWM of described second audion seals ripple signal.
2. an IGBT inverter type welder, it is characterised in that: include the current foldback circuit being applied to IGBT inverter type welder described in IGBT inverter type welder body and claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620101563.4U CN205629628U (en) | 2016-02-01 | 2016-02-01 | Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620101563.4U CN205629628U (en) | 2016-02-01 | 2016-02-01 | Be applied to current foldback circuit and IGBT contravariant welding machine of IGBT contravariant welding machine |
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| CN205629628U true CN205629628U (en) | 2016-10-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807435A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | Inverter type welder and its protection control circuit |
| CN110535099A (en) * | 2019-09-11 | 2019-12-03 | 青岛诺亚工业设备有限公司 | A kind of inverter type welder IGBT protects self-locking circuit and method |
-
2016
- 2016-02-01 CN CN201620101563.4U patent/CN205629628U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109807435A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | Inverter type welder and its protection control circuit |
| CN109807435B (en) * | 2018-12-28 | 2021-02-26 | 上海沪工焊接集团股份有限公司 | Inverter welding machine and protection control circuit thereof |
| CN110535099A (en) * | 2019-09-11 | 2019-12-03 | 青岛诺亚工业设备有限公司 | A kind of inverter type welder IGBT protects self-locking circuit and method |
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