CN208467479U - A kind of overcurrent protective device - Google Patents
A kind of overcurrent protective device Download PDFInfo
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- CN208467479U CN208467479U CN201820819943.0U CN201820819943U CN208467479U CN 208467479 U CN208467479 U CN 208467479U CN 201820819943 U CN201820819943 U CN 201820819943U CN 208467479 U CN208467479 U CN 208467479U
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- inverter module
- connect
- transformer
- current sensor
- comparator
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Abstract
The utility model discloses a kind of overcurrent protective devices, including current sensor, Shape correction circuit, comparator, single-chip microcontroller, touch screen and IGBT drive module；The connection of the output end of current sensor and inverter module, current sensor are also connect with Shape correction circuit connection, comparator and Shape correction circuit connection, touch screen with single-chip microcontroller, and IGBT drive module is connect with single-chip microcontroller, and IGBT drive module is connect with inverter module.Advantages and beneficial effects of the utility model lie in that avoiding because welding machine or transformer short circuit occur and lead to the case where damaging due to inverter module output electric current is excessive; the safety for having ensured welding machine, transformer and inverter module plays the overcurrent protection to IGBT；It is issued and is alarmed by touch screen, to remind worker to find the short trouble of welding machine or transformer in time, and the failure is handled in time, reduce welding machine, transformer and inverter module damage risk, thereby reduce enterprise's production cost.
Description
Technical field
The utility model relates to field of electrical control, in particular to a kind of overcurrent protective device.
Background technique
Inverter type welder is gradually recognized, is the core force of the following welding profession.Inverter type welder is first by three-phase alternating current
Electricity carries out rectifying and wave-filtering and becomes direct current, is then reverse into 1KHz alternating current supply welder transformer, welded change using IGBT
Depressor decompression, then low-voltage DC is become by diode progress full-wave rectification, it is used for welding.
Inversion welding source is connected by cable with welding transformer, caused by often occurring because of reasons such as abrasion vibrations
Short trouble, once there is short trouble, it is very big by the short circuit current of IGBT, it is easy to burn out IGBT.IGBT's is anti-
For overload capacity not as good as silicon-controlled, the maximum surge current allowed in 1mS only has one times of rated current, when short circuit occurs for load
It is theoretically infinity by the electric current of IGBT, to protect the safety of IGBT necessary in the case where load short circuits when failure
Want speed fast, and the method for detecting electric current will reliably effectively, by IGBT shutdown it is ensured that IGBT generally within 10uS
Safety.
The method of usually protection IGBT overcurrent is the driving circuit by IGBT, and the driving circuit of IGBT generally has specialized factory
Production has certain excess current protective function.Driving circuit overcurrent testing principle is IGBT there are certain internal resistance, when having
When electric current passes through IGBT, pressure drop can be generated at the both ends C, E of IGBT, under normal circumstances pressure drop very little, the voltage of only several volts, when
Driving circuit detect the both ends IGBT voltage be more than certain value after think overcurrent fault.
However, the method for existing protection IGBT overcurrent just not necessarily can to because of IGBT overcurrent caused by load short circuits
Accurately differentiate.
Utility model content
To solve the above-mentioned problems, the utility model provides a kind of overcurrent protective device.The technical program occurs in welding machine
When short-circuit conditions, comparator will export shutdown signal to single-chip microcontroller, and single-chip microcontroller will control IGBT drive module according to shutdown signal
Stop turning off inverter module, and then avoid because welding machine or transformer go out to inverter module output pulse width modulated signal
The case where existing short circuit causes inverter module output electric current excessive and damages, welding machine, transformer and inverter module are ensured
Safety, plays the overcurrent protection to IGBT；Single-chip microcontroller exports alarm signal to touch screen also according to cut-off signals, touches
Screen is issued according to alarm signal and is alarmed, to remind worker to find the short trouble of welding machine or transformer in time, and to the failure into
Row processing in time, reduces welding machine, transformer and inverter module damage risk, thereby reduces enterprise's production cost.
One of the utility model overcurrent protective device, including current sensor, Shape correction circuit, comparator, list
Piece machine, touch screen and IGBT drive module；The connection of the output end of the current sensor and inverter module, the current sensor
Also with the Shape correction circuit connection, the comparator and the Shape correction circuit connection, the touch screen and the list
The connection of piece machine, the IGBT drive module are connect with the single-chip microcontroller, and the IGBT drive module is connect with inverter module.
In above scheme, the current sensor is Hall current sensor.
In above scheme, the Shape correction circuit includes shaping circuit and filter circuit, the shaping circuit with it is described
Current sensor connection, the filter circuit are connect with the shaping circuit, and the shaping circuit is also connect with the comparator.
In above scheme, the comparator is voltage comparator.
In above scheme, the inverter module receives the direct current exported by current rectifying and wave filtering circuit, and the inverter module will
It after the DC inverter is at alternating current, is exported by the output end of inverter module to transformer, the transformer is connect with welding machine.
Advantages and beneficial effects of the utility model lie in that the utility model provides a kind of overcurrent protective device, avoid
Lead to the case where damaging due to inverter module output electric current is excessive because short circuit occur in welding machine or transformer, has ensured welding machine, become
The safety of depressor and inverter module plays the overcurrent protection to IGBT；It is issued and is alarmed by touch screen, to remind worker
The short trouble of discovery welding machine or transformer in time, and the failure is handled in time, reduce welding machine, transformer and inversion
Module damage risk, thereby reduces enterprise's production cost.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of overcurrent protective device of the utility model.
In figure: 1, current sensor 2, Shape correction circuit 3, comparator 4, single-chip microcontroller
5, touch screen 6, IGBT drive module 7, inverter module 8, welding machine
9, transformer 10, current rectifying and wave filtering circuit 21, shaping circuit 22, filter circuit
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is further described.Implement below
Example is only used for clearly illustrating the technical solution of the utility model, and cannot be used as a limitation the protection model of limitation the utility model
It encloses.
As shown in Figure 1, the utility model is a kind of overcurrent protective device, including current sensor 1, Shape correction circuit 2,
Comparator 3, single-chip microcontroller 4, touch screen 5 and IGBT drive module 6；Current sensor 1 is connect with the output end of inverter module 7, electricity
Flow sensor 1 is also connect with Shape correction circuit 2, and comparator 3 is connect with Shape correction circuit 2, and touch screen 5 and single-chip microcontroller 4 connect
It connects, IGBT drive module 6 is connect with single-chip microcontroller 4, and IGBT drive module 6 is connect with inverter module 7.
Preferably, current sensor 1 is Hall current sensor.
Preferably, Shape correction circuit 2 includes shaping circuit 21 and filter circuit 22, shaping circuit 21 and current sensor
1 connection, filter circuit 22 are connect with shaping circuit 21, and shaping circuit 21 is also connect with comparator 3.
Preferably, comparator 3 is voltage comparator.
Preferably, inverter module 7 receives the direct current that is exported by current rectifying and wave filtering circuit 10, and inverter module 7 is by the direct current
After being reverse into alternating current, exported by the output end of inverter module 7 to transformer 9, transformer 9 is connect with welding machine 8.
Wherein, inverter module 7 is the IGBT power mould that is made of several IGBT (insulated gate bipolar transistor)
Block, IGBT drive module are used to respectively drive each IGBT in inverter module 7.
The working principle of above-mentioned technical proposal is: the electricity that current sensor 1 passes through the output end output of sensing inverter module 7
Stream forms voltage signal and exports to shaping circuit 21, wherein the current strength and voltage signal that inverter module 7 exports is mutual
Matching；
After shaping circuit 21 carries out shaping to voltage signal, outputs this to filter circuit 22 and be filtered, filter circuit
22 again export voltage signal to comparator 3, are provided with predeterminated voltage in comparator 3, and the predeterminated voltage and inverter module 7 allow
By maximum current matching, predeterminated voltage and voltage signal is compared in comparator 3；
When short-circuit conditions occurs in welding machine 8, the electric current that inverter module 7 exports at this time will start to increase, when voltage signal
When voltage value is greater than the voltage value of predeterminated voltage, comparator 3 will export shutdown signal to single-chip microcontroller 4, and single-chip microcontroller 4 will be according to closing
Signal control IGBT drive module 6 stops turning off inverter module 7, in turn to 7 output pulse width modulated signal of inverter module
It avoids because welding machine 8 or transformer 9 short circuit occur and lead to the case where damaging due to the output electric current of inverter module 7 is excessive, guarantee
The safety of welding machine 8, transformer 9 and inverter module 7, plays the overcurrent protection to IGBT；
Single-chip microcontroller 4 exports alarm signal to touch screen 5 also according to cut-off signals, and touch screen 5 is issued according to alarm signal and reported
It is alert, to remind worker to find the short trouble of welding machine 8 or transformer 9 in time, and the failure is handled in time, reduces weldering
7 damage risk of machine 8, transformer 9 and inverter module, thereby reduces enterprise's production cost.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (5)
1. a kind of overcurrent protective device, which is characterized in that including current sensor, Shape correction circuit, comparator, single-chip microcontroller,
Touch screen and IGBT drive module；The output end of the current sensor and inverter module connection, the current sensor also with
The Shape correction circuit connection, the comparator and the Shape correction circuit connection, the touch screen and the single-chip microcontroller
Connection, the IGBT drive module are connect with the single-chip microcontroller, and the IGBT drive module is connect with inverter module.
2. a kind of overcurrent protective device according to claim 1, which is characterized in that the current sensor is Hall current
Sensor.
3. a kind of overcurrent protective device according to claim 1, which is characterized in that the Shape correction circuit includes shaping
Circuit and filter circuit, the shaping circuit are connect with the current sensor, and the filter circuit and the shaping circuit connect
It connects, the shaping circuit is also connect with the comparator.
4. a kind of overcurrent protective device according to claim 1, which is characterized in that the comparator is voltage comparator.
5. a kind of overcurrent protective device according to claim 1, which is characterized in that the inverter module is received to be filtered by rectification
Wave circuit output direct current, the inverter module by the DC inverter at alternating current after, pass through the output end of inverter module
To transformer, the transformer is connect with welding machine for output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820819943.0U CN208467479U (en) | 2018-05-29 | 2018-05-29 | A kind of overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820819943.0U CN208467479U (en) | 2018-05-29 | 2018-05-29 | A kind of overcurrent protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208467479U true CN208467479U (en) | 2019-02-05 |
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ID=65219576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820819943.0U Active CN208467479U (en) | 2018-05-29 | 2018-05-29 | A kind of overcurrent protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208467479U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992865A (en) * | 2020-08-21 | 2020-11-27 | 天津七所高科技有限公司 | Fault detection circuit and method for secondary rectifier module of inverter resistance welding |
-
2018
- 2018-05-29 CN CN201820819943.0U patent/CN208467479U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992865A (en) * | 2020-08-21 | 2020-11-27 | 天津七所高科技有限公司 | Fault detection circuit and method for secondary rectifier module of inverter resistance welding |
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