CN208110023U - Hall current sensor offset correction device for welding machine - Google Patents
Hall current sensor offset correction device for welding machine Download PDFInfo
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- CN208110023U CN208110023U CN201820344380.4U CN201820344380U CN208110023U CN 208110023 U CN208110023 U CN 208110023U CN 201820344380 U CN201820344380 U CN 201820344380U CN 208110023 U CN208110023 U CN 208110023U
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Abstract
The utility model discloses a kind of Hall current sensor offset correction device for welding machine, which is characterized in that including：One sampled signal, preset signal, first comparator unit and the second comparator unit；The sampled signal connects the negative input end of the first comparator unit, the preset signal connects the positive input terminal of the first comparator unit, forms the first comparison circuit with the output end of the first comparator unit；The sampled signal connects the positive input terminal of second comparator unit, the preset signal connects the negative input end of second comparator unit, forms the second comparison circuit with the output end of second comparator unit.
Description
Technical field
The utility model relates to welding machine technical fields, in particular to the Hall current sensor offset correction device of welding machine.
Background technique
Hall current sensor is based on magnetic balance type hall principle, and a high current is transformed to secondary small voltage and is believed
Number, and then obtain current value.According to Hall effect principle, it is passed through electric current I from the control current terminal of Hall element, in Hall element
Apply the magnetic field that magnetic field strength is B in the normal direction of plane, generates potential perpendicular to electric current and magnetic direction in this way.Pass through
The size of measurement Hall voltage can measure the size of current flowed through in conductor indirectly.By electricity-magnetic-electricity conversion, realize
Sampling to electrical insulation isolation.
Hall current sensor has many advantages in industrial application.Due to using non-contact detection, can not change
Become the measurement that original electrical wiring is directly realized by current value, and be isolated with electrical equipment, avoids many unnecessary
Interference, and on electrical equipment without influence, high-precision feedback current waveform.Traditional detection element by assigned frequency, specified waveform,
The limitation of the several factors such as response lag is difficult to be widely applied, and Hall current sensor measurement range of new generation is wide, can measure
The electric current of random waveform, fast response time also can display real-time the peak point current of transient state, and measurement accuracy is high, and measurement accuracy is excellent
In 1%, highly reliable, Mean duration is long, and overload capacity is strong, and measurement range is big, and measurement range reaches Wan An training.
Drift current is also aftercurrent or residual current, refers to that no current flows through in actual wire, but hall sensing
Device has detected that electric current flows through, and feedback information is caused not conform to the actual conditions, gently then electrical equipment failure, heavy then endanger personal safety.
Drift current is mainly in Hall element or electronic circuit caused by operational amplifier job insecurity, and sensor is raw
When production, at 25 DEG C, under conditions of primary current is zero, zero adjustment was carried out, but in practical applications, different work
The offset that environment causes sensor different degrees of will not work under identical environment always the same electrical equipment.
The considerations of for safety reliability to electrical equipment, even more to personal safety the considerations of, the offset of Hall current sensor
Correction is essential.
Summary of the invention
In view of problems of the prior art, the utility model provides a kind of Hall current sensor for welding machine
Offset correction device can detect the offset correction of Hall sensor automatically.
In order to realize above-mentioned purpose of utility model, it is inclined that the utility model discloses a kind of Hall current sensor for welding machine
Shift correction device, including：One sampled signal, preset signal, first comparator unit and the second comparator unit；The sampled signal
Connect the negative input end of the first comparator unit, the preset signal connects the positive input terminal of the first comparator unit, with this
The output end of first comparator unit forms the first comparison circuit；The sampled signal connects the positive input of second comparator unit
End, the preset signal connect the negative input end of second comparator unit, form the with the output end of second comparator unit
Two comparison circuits.
Further, when which is greater than the preset signal, which is greater than zero, sentences
Disconnected Hall current sensor positively biased；When the sampled signal is less than or equal to the preset signal, the second comparison circuit output signal is big
In zero, Hall sensor negative bias is judged.
Further, which further includes resistance R1, R2, R3, R6, capacitor C1, C2, zener diode
The one end ZD1, resistance R1 connects the preset signal, and the other end connects the first comparator unit positive input terminal and second ratio
Compared with the negative input end of device unit, one end is connecting resistance R1 and the comparator unit just after resistance R6 is in parallel with capacitor C1
Input terminal, other end ground connection, the one end capacitor C1 connect power supply other end ground connection, and the one end resistance R2 connects the first comparator
The output end of unit, the other end connect resistance R3 and zener diode ZD1, resistance R3 other end ground connection, the pressure stabilizing two
The other end of pole pipe ZD1 is for exporting the first comparison circuit output signal.
Further, which further includes resistance R4, R5, R5, capacitor C3, zener diode ZD2, the electricity
Resistance one end R4 connects the sampled signal, and the other end connects the negative input end and the second comparator list of the first comparator unit
The positive input terminal of member, resistance R5 connect resistance R4 with capacitor C4 latter face in parallel, and other end ground connection, the one end resistance R7 connects
The second comparator unit output end other end ground connection is connect, it is defeated that the one end zener diode ZD2 connects second comparator unit
The outlet other end is for exporting the second comparison circuit output signal.
Compared with prior art, the utility model realizes the offset school to sensor using the method for software and hardware regulation
Just, whether deviated by detection circuit real-time detection Hall current sensor, and according to the positively or negatively progress of offset
Different parameter compensation.The technical program may be implemented to automatically correct, convenient and reliable, time saving and energy saving, save the cost.This technology side
Detection method and detection circuit provided by case can be adapted for different machinery equipments and different Hall sensors, effectively keep away
The adverse effect caused by current offset occurs because of Hall current sensor is exempted from.
Detailed description of the invention
Attached drawing for a better understanding of the present invention, does not constitute an undue limitation on the present invention, wherein：
Fig. 1 is the flow chart of Hall current sensor offset correction method involved in the utility model；
Fig. 2 is the circuit diagram of Hall current sensor offset correction device involved in the utility model.
Specific embodiment
There are will lead to set real work when drift current in the Hall current sensor as described in background technique
It is standby to check inaccuracy.When Hall current sensor is used for welding machine, in case of forward migration（Refer in currentless situation,
Sensor detects electric current, so that the current value ratio actual value of feedback is bigger than normal, even up to ten amperes of offset）, many butt welding
The judgement of electromechanics stream will appear problem.For example judge that current value is supplied gas less than the stopping of two ampere-hours, it is bigger than normal due to sampled value, most
Small sample rate current also can be bigger than two amperes, and welding machine is caused to be supplied gas always；Striking current is five amperes, and pre-value is five ampere-hours,
Actual current only has zero ampere.Hall positively biased causes many functions cannot achieve, and seriously affects machine use, or even have safety hidden
Suffer from.Hall negative bias and positively biased cause to detect electric current less than normal than actual current on the contrary, actually have electric current, but can't detect electric current.
After influence of the Hall current negative bias to welding machine function is little, but actual current is bigger than normal, when long-time high load works, seriously affect
Service life of a machine, workpieces processing is imperfect, or even damage.
The core concept of the utility model is to provide the Hall current sensor offset correction device for welding machine, can be with
The offset correction of automatic detection Hall sensor, Hall current sensor, which can be effectively detected, whether there is drift current,
And the compensation offset value in welding machine work.
To keep the purpose of this utility model, advantages and features clearer, below in conjunction with attached Fig. 1 and 2 to the utility model
The device of proposition is described in further detail.It should be noted that attached drawing is all made of very simplified form and using non-accurate
Ratio, only to it is convenient, lucidly aid in illustrating the purpose of the utility model embodiment.
As used in this specification, singular "a", "an" and "the" includes plural reference, unless interior
In addition appearance explicitly points out outer.It is as used in this specification, term "or" be usually to include the meaning of "and/or" and into
Enforcement, in addition in addition non-content explicitly points out.
Fig. 1 is the flow chart of Hall current sensor offset correction method involved in the utility model.As shown in Figure 1,
The flow chart includes startup self-detection S1.It is in off working state after welding machine booting, at this time the output electric current of Hall current sensor
It should be zero, the current value of sensor feedback also should be zero at this time.The current value S2 of detection sensor feedback.Hall current sensing
Device connects a detection circuit, and detection circuit uses the output electric current S3 of Hall current sensor, if Hall current senses at this time
The output electric current of device is zero, then illustrates do not have electric current to flow through in Hall current sensor, and drift current is not present.The normal work of welding machine
Make, and initially enters working condition S5.If the output electric current of Hall current sensor is not zero at this time, illustrate Hall at this time
Forward migration has occurred in current sensor.Offset in order to reduce error, when record welding machine is switched on two seconds.Electricity in program
It is modified in stream calculation, since sensor positively biased causes actual current less than normal, increases offset S4 in electric current calculating.It is anti-
The only fluctuation of current sample, the deviant of sensor feedback is corrected parameter when selecting after being switched on two seconds, and corrected parameter is no longer
Modification, next time reselect corrected parameter when being switched on again.
After welding machine enters working condition, constant output current, output voltage is fluctuated within the allowable range, such as positive and negative 2V, weldering
Machine can be considered as steady-working state S5 at this time.Welding machine enters steady-working state after a certain period of time, such as after two seconds, Hall current
The current value of sensor is no longer changed S6.Compare the size S7 of the current value of electric current preset value and sensor feedback at this time.
If two values are identical, Hall current sensor works normally S8, on the contrary then negative bias occurs, and preset value is bigger than value of feedback, takes
The difference of the two, as corrected parameter S9.Output actual current at this time is bigger than normal, so subtracting corrected parameter in electric current calculating to obtain the final product
To real current.It is prevented from fluctuation, corrected parameter only takes once, do not modifying, and reselects amendment ginseng next time when being switched on again
Number.
Fig. 2 is the circuit diagram of Hall current sensor offset correction device involved in the utility model.Hardware electricity
Road is designed as judging Hall drift condition, and Hall sampled signal IF, preset signal IG compare two signal magnitudes.When IF is greater than IG
When i.e. Atest signal is greater than zero, Hall positively biased is judged, when deviant IF, IF are greater than less than or equal to IG, that is, Btest, judgement is suddenly
That negative bias, deviant IG-IF.It otherwise is ordinary Hall.As shown in Fig. 2, the hardware circuit mainly includes first comparator list
First U1 and the second comparator unit U2.Wherein sampled signal IF connects the negative input end of first comparator unit U1, pre- confidence
Number IG connects the positive input terminal of first comparator unit U1, compared with forming first with the output end of first comparator unit U1
Circuit.Sampled signal connects the positive input terminal of second comparator unit U2, the preset signal connects second comparator unit
The negative input end of U2 forms the second comparison circuit with the output end of second comparator unit U2.When the hardware circuit detects
When positively biased, hall current detector Introduced Malaria parameter is+IF.When the hardware circuit detects negative bias, Hall current detection
Device Introduced Malaria parameter is-(IG-IF).
First comparison circuit further includes resistance R1, R2, R3, R6, capacitor C1, C2, zener diode ZD1, resistance R1
One end connects the preset signal, and the other end connects the negative of the first comparator unit positive input terminal and second comparator unit
Input terminal, one end connect resistance R1 and the positive input terminal of the comparator unit after resistance R6 is in parallel with capacitor C1, another
End ground connection, the one end capacitor C1 connect power supply other end ground connection, and the one end resistance R2 connects the output of the first comparator unit
End, the other end connect resistance R3 and zener diode ZD1, and the resistance R3 other end is grounded, the zener diode it is another
End is for exporting the first comparison circuit output signal.
Second comparison circuit further includes resistance R4, R5, R7, capacitor C3, zener diode ZD2, and the one end resistance R4 connects
The sampled signal is connect, the other end connects the negative input end of the first comparator unit and the positive input of second comparator unit
End, one end connects resistance R4, other end ground connection after resistance R5 is in parallel with capacitor C3；The one end resistance R7 connects second ratio
It is grounded compared with the device unit output end other end, the one end zener diode ZD2 connects the second comparator unit output end other end
For exporting the second comparison circuit output signal.
Compared with prior art, the utility model realizes the offset school to sensor using the method for software and hardware regulation
Just, whether deviated by detection circuit real-time detection Hall current sensor, and according to the positively or negatively progress of offset
Different parameter compensation.The technical program may be implemented to automatically correct, convenient and reliable, time saving and energy saving, save the cost.This technology side
Detection method and detection circuit provided by case can be adapted for different machinery equipments and different Hall sensors, effectively keep away
The adverse effect caused by current offset occurs because of Hall current sensor is exempted from.
Claims (4)
1. a kind of Hall current sensor offset correction device for welding machine, which is characterized in that including：It is one sampled signal, pre-
Confidence number, first comparator unit and the second comparator unit；The sampled signal connects the negative of the first comparator unit
Input terminal, the preset signal connect the positive input terminal of the first comparator unit, defeated with the first comparator unit
Outlet forms the first comparison circuit；The sampled signal connects the positive input terminal of second comparator unit, the pre- confidence
The negative input end of number connection second comparator unit, it is electric compared with the output end of second comparator unit forms second
Road.
2. offset correction device as described in claim 1, which is characterized in that the sampled signal is greater than the preset signal
When, the first comparison circuit output signal is greater than zero, judges Hall current sensor positively biased；The sampled signal is less than or equal to
When the preset signal, the second comparison circuit output signal is greater than zero, judges Hall sensor negative bias.
3. offset correction device as described in claim 1, which is characterized in that first comparison circuit further include resistance R1,
R2, R3, R6, capacitor C1, C2, zener diode ZD1, the one end the resistance R1 connect the preset signal, and the other end connects institute
State the negative input end of first comparator unit positive input terminal and second comparator unit, the resistance R6 and the capacitor
One end connects the positive input terminal of the resistance R1 and the comparator unit, other end ground connection, the capacitor C1 mono- after C1 is in parallel
End connection power supply other end ground connection, the one end the resistance R2 connect the output end of the first comparator unit, other end connection
The resistance R3 and zener diode ZD1, the resistance R3 other end ground connection, the other end of the zener diode ZD1
For exporting the first comparison circuit output signal.
4. offset correction device as described in claim 1, which is characterized in that second comparison circuit further include resistance R4,
R5, R7, capacitor C3, zener diode ZD2, the one end the resistance R4 connect the sampled signal, other end connection described first
After the positive input terminal of the negative input end of comparator unit and second comparator unit, the resistance R5 and capacitor C3 parallel connection
One end connects the resistance R4, other end ground connection；It is another that the one end the resistance R7 connects the second comparator unit output end
End ground connection, the one end the zener diode ZD2 connect the second comparator unit output end other end for exporting described the
Two comparison circuit output signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820344380.4U CN208110023U (en) | 2018-03-14 | 2018-03-14 | Hall current sensor offset correction device for welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820344380.4U CN208110023U (en) | 2018-03-14 | 2018-03-14 | Hall current sensor offset correction device for welding machine |
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| Publication Number | Publication Date |
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| CN208110023U true CN208110023U (en) | 2018-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820344380.4U Active CN208110023U (en) | 2018-03-14 | 2018-03-14 | Hall current sensor offset correction device for welding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519571A (en) * | 2018-03-14 | 2018-09-11 | 上海威特力焊接设备制造股份有限公司 | The method and device of Hall current sensor offset correction for welding machine |
-
2018
- 2018-03-14 CN CN201820344380.4U patent/CN208110023U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519571A (en) * | 2018-03-14 | 2018-09-11 | 上海威特力焊接设备制造股份有限公司 | The method and device of Hall current sensor offset correction for welding machine |
| CN108519571B (en) * | 2018-03-14 | 2024-01-23 | 上海威特力焊接设备制造股份有限公司 | Method and device for offset correction of Hall current sensor of welding machine |
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