CN208239512U - A kind of tong-type ammeter - Google Patents
A kind of tong-type ammeter Download PDFInfo
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- CN208239512U CN208239512U CN201820417664.1U CN201820417664U CN208239512U CN 208239512 U CN208239512 U CN 208239512U CN 201820417664 U CN201820417664 U CN 201820417664U CN 208239512 U CN208239512 U CN 208239512U
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Abstract
The utility model discloses a kind of tong-type ammeters, including Hall binding clip, sampling resistor and control mould group, wherein Hall binding clip measures electric current by Hall element, obtains sample rate current；Sample rate current is converted sampled voltage by sampling resistor；It controls mould group and sampled voltage is subjected to signal processing, obtain the numerical value of measurement electric current；Its connection relationship is as follows: Hall binding clip is passed through on tested conducting wire, the output end of Hall binding clip is electrically connected with one end of sampling resistor；The other end of sampling resistor is electrically connected with the input terminal of control mould group.The utility model has the beneficial effects that 1. jaw shapes being engaged using improved dentation, it can be to avoid jaw opening void dimension fluid the problem of causing entire magnetic circuit reluctance unstable and then influencing accuracy correction；2. Hall chip is placed in the centre of two a quarter circle magnetic cores, void dimension is fixed, and trueness error is stablized, and amendment is easy.
Description
Technical field
The utility model relates to field of current measurement, more particularly, to a kind of tong-type ammeter.
Background technique
There are many measurement method of electric current, common are current divider, mutual inductor, hall effect sensor, magnetic amplifier type electric current
Comparator, magnetic modulation type current comparator etc..Electrical technology field carry out current measurement when, generally require it is accurate, quickly and
Easily realize the measurement of electric current.In engineering site in application, if necessary to could be by current measuring device after by circuitry cuts
Access measures, time-consuming and laborious and dangerous, does not especially meet phase in the electric current of the electric device of measurement normal operation
Close safety standard.At this point, can be measured under the case where not cutting off circuit using jaw type current measuring device with regard to more convenient
Electric current.
Jaw type current measuring device based on Hall effect is a kind of currently used relatively broad current measurer.It is based on
The current clamp of Hall effect processes an air gap in magnetic core and places Hall element.Utilize the magnetic strength in Hall element measurement air gap
Intensity is answered, according to control mode difference, there is open loop and closed loop two types.Open loop Hall type uses the preferable Hall member of the linearity
Part, hall element output voltage are proportional to tested electric current.Closed loop Hall type uses Zero flux technology, has bucking coil on magnetic core.
When primary has tested electric current to generate magnetic flux in magnetic core, Hall element detects the magnetic induction intensity in magnetic core, passes through negative-feedback
This error voltage is converted into electric current driving bucking coil, offsets the magnetic flux in magnetic core, finally tested electric current and bucking coil produce
Raw magnetic flux is in the same size contrary, and the electric current by measuring bucking coil can converse tested electricity according to turn ratio
Stream.
Utility model content
The utility model provides a kind of new tong-type ammeter, and the utility model uses the jaw of improved dentation occlusion
Shape can cause entire magnetic circuit reluctance unstable and then influence accuracy correction to avoid jaw opening void dimension is fluid
The problem of；Secondly, Hall chip is placed in the centre of two a quarter circle magnetic cores, void dimension is fixed, and trueness error is steady
Fixed, amendment is easy.
In order to solve the above technical problems, the technical solution of the utility model is as follows:
A kind of tong-type ammeter, including Hall binding clip, sampling resistor and control mould group, wherein
The Hall binding clip measures electric current by Hall element, obtains sample rate current；
Sample rate current is converted sampled voltage by the sampling resistor；
Sampled voltage is carried out signal processing by the control mould group, obtains the numerical value of measurement electric current；
Its connection relationship is as follows:
Hall binding clip is passed through on tested conducting wire, the output end of Hall binding clip and one end of sampling resistor are electrically connected
It connects；
The other end of the sampling resistor is electrically connected with the input terminal of control mould group.
Utility model works process is as follows:
Measured wire is passed through into Hall binding clip, you measure measured wire by Hall element binding clip, are sampled
Signal, sampled signal switch to sampled voltage by sampling resistor, control mould group for sampled voltage and carry out signal processing, are tested
The numerical value of the electric current of conducting wire.
In a preferred solution, the Hall binding clip includes jaw type probe, and the shape of the jaw type probe is
Annular, and Hall binding clip includes the first movable binding clip and the second movable binding clip, the described first movable binding clip and the second adjustable clamp
Head connection group circularizes binding clip.
In a preferred solution, the vice jaw part of the described first movable binding clip is provided with dentalation, and described the
The vice jaw part of two movable binding clips is provided with dentalation, and the dentation of the dentalation of the first movable binding clip and the second movable binding clip
Structure is opposite, is attached group by engaged mode and circularizes binding clip.
In this preferred scheme, jaw opening uses engaged dentalation, and void dimension at jaw is avoided to float
Suddenly indefinite to cause entire magnetic circuit reluctance unstable, and then influence the problem of measurement accuracy corrects.
In a preferred solution, Hall binding clip further includes Hall element, and the Hall element setting is living first
Dynamic binding clip or the second movable binding clip, and Hall element and the angle of jaw apart are 90 degree.
In this preferred embodiment, Hall chip is placed at the intermediate air gap of two a quarter circles, with jaw position angle
Difference 90 degree, void dimension be completely fixed (will not because jaw it is elastic due to change), the Correction Solution of air gap leakage field bring precision
Certainly it is more easily handled.
In a preferred solution, the Hall binding clip further includes Hall element circuit, Hall power supply circuit and sense
Answer coil, wherein
The Hall element circuit obtains sample rate current for amplifying the inductive signal of Hall element；
The Hall power supply circuit is powered Hall element.
In a preferred solution, the Hall element circuit includes opa551 chip, first resistor, the second electricity
Resistance, 3rd resistor, the 4th resistance, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor,
One interface and second interface, wherein
The first interface includes four ports, and the first interface is for connecting Hall element；
The second interface includes two ports, and the second interface is for connecting induction coil；
Its connection relationship is as follows:
No. 2 pins of the opa551 are electrically connected with one end of first capacitor；
No. 2 pins of the opa551 are electrically connected with one end of first resistor；
The other end of the first capacitor is electrically connected with No. 6 pins of opa551；
The other end of the first resistor is electrically connected with No. 6 pins of opa551；
No. 2 pins of the opa551 are electrically connected with one end of second resistance；
The other end of the second resistance is electrically connected with the 4th port of first interface；
The third port of the first interface is electrically connected with the transmission of electricity interface of Hall power supply circuit；
No. 3 pins of the opa551 are electrically connected with one end of 3rd resistor；
No. 3 pins of the opa551 are electrically connected with one end of the second capacitor；
No. 3 pins of the opa551 are electrically connected with one end of the 4th resistance；
The other end of second capacitor is grounded；
The other end of 4th resistance is grounded；
The other end of the 3rd resistor is electrically connected with the second port of first interface；
The first port of the first interface is grounded；
No. 4 pins of the opa551 connect power supply；
No. 4 pins of the opa551 are electrically connected with one end of the 5th capacitor；
No. 4 pins of the opa551 are electrically connected with one end of the 6th capacitor；
The other end of 5th capacitor is grounded；
The other end of 6th capacitor is grounded；
No. 7 pins of the opa551 connect power supply；
No. 7 pins of the opa551 are electrically connected with one end of third capacitor；
No. 7 pins of the opa551 are electrically connected with one end of the 4th capacitor；
The other end of the third capacitor is grounded；
The other end of 4th capacitor is grounded；
No. 6 pins of the opa551 are electrically connected with the first port of second interface；
The second port of the second interface is electrically connected with one end of sampling resistor；
The other end of the sampling resistor is grounded.
In a preferred solution, the Hall power supply circuit include LM317 chip, the 7th capacitor, the 8th capacitor,
6th resistance and the 7th resistance, connection relationship are as follows:
No. 3 pins of the LM317 chip connect power supply, and one end of No. 3 pins and the 7th capacitor of LM317 chip is electrically connected
It connects；
The other end of 7th capacitor is grounded；
No. 1 pin of the LM317 chip is electrically connected with one end of the 6th resistance；
No. 1 pin of the LM317 chip is electrically connected with one end of the 7th resistance；
The other end of 7th resistance is grounded；
The other end of 6th resistance and No. 2 pins of LM317 chip are grounded；
Transmission of electricity interface of No. 2 pins of the LM317 chip as Hall power supply circuit, No. 2 pins of LM317 chip
It is electrically connected with one end of the 8th capacitor；
The other end of 8th capacitor is grounded.
In a preferred solution, the control mould group includes filter circuit, sample circuit, micro-chip processor, shows
Display screen, wherein
Input terminal of the input terminal of the filter circuit as control mould group, the output end and sample circuit of filter circuit
Input terminal electrical connection；
The output end of the sample circuit is electrically connected with the input terminal of micro-chip processor；
First output end of the micro-chip processor is electrically connected with the input terminal of display screen.
In a preferred solution, the control mould group further includes wireless communication module, the radio communication mold
The input terminal of block is electrically connected with the second output terminal of micro-chip processor.
In this preferred embodiment, module can be passed the data that measurement obtains in the form of wireless digital signal by wireless communication
Computer or mobile phone terminal are passed, wired data transfer bring is avoided to interfere.
Compared with prior art, the beneficial effect of technical solutions of the utility model is:
1. can be caused using the jaw shapes of improved dentation occlusion to avoid jaw opening void dimension is fluid
Entire magnetic circuit reluctance is unstable and then the problem of influencing accuracy correction；
2. Hall chip is placed in the centre of two a quarter circle magnetic cores, void dimension is fixed, and trueness error is stablized,
Amendment is easy.
Detailed description of the invention
Fig. 1 is the module map of embodiment.
Fig. 2 is Hall binding clip and sampling resistor circuit diagram in embodiment.
Fig. 3 is the circuit diagram of Hall chip in embodiment.
Fig. 4 is the example of parameters figure of embodiment.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；
In order to better illustrate this embodiment, the certain components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be understood that certain known features and its explanation, which may be omitted, in attached drawing
's.
The technical solution of the utility model is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of tong-type ammeter, including Hall binding clip, sampling resistor and control mould group, wherein
Hall binding clip measures electric current by Hall element HW302B, obtains sample rate current；
Sample rate current is converted sampled voltage by sampling resistor；
It controls mould group and sampled voltage is subjected to signal processing, obtain the numerical value of measurement electric current；
Its connection relationship is as follows:
Hall binding clip is passed through on tested conducting wire, the output end of Hall binding clip is electrically connected with one end of sampling resistor；
The other end of sampling resistor is electrically connected with the input terminal of control mould group.
Wherein, Hall binding clip includes jaw type probe, and the shape of jaw type probe is annular, and Hall binding clip includes the first activity
Binding clip and the second movable binding clip, the vice jaw part of the first movable binding clip are provided with dentalation, and the vice jaw part of the second movable binding clip is set
It is equipped with dentalation, and the dentalation of the first movable binding clip is opposite with the second movable dentalation of binding clip, by stinging mutually
The mode of conjunction is attached group and circularizes binding clip.
Wherein, Hall binding clip further includes Hall element HW302B, Hall element HW302B setting in the first movable binding clip or
The movable binding clip of person second, and Hall element HW302B and the angle of jaw apart are 90 degree.
Controlling mould group includes filter circuit, sample circuit, micro-chip processor, display screen and wireless communication module, wherein
Input terminal of the input terminal of filter circuit as control mould group, the input of the output end and sample circuit of filter circuit
End electrical connection；
The output end of sample circuit is electrically connected with the input terminal of micro-chip processor；
First output end of micro-chip processor is electrically connected with the input terminal of display screen.
The input terminal of wireless communication module is electrically connected with the second output terminal of micro-chip processor.
Hall binding clip further includes Hall element circuit, Hall power supply circuit and induction coil, wherein
As described in Figure 2, Hall element circuit includes opa551 chip, first resistor, second resistance, 3rd resistor, the 4th
Resistance, first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, first interface and second connect
Mouthful, wherein
First interface includes four ports, and the first interface is for connecting Hall element HW302B；
Second interface includes two ports, and the second interface is for connecting induction coil；
Its connection relationship is as follows:
No. 2 pins of opa551 are electrically connected with one end of first capacitor；
No. 2 pins of opa551 are electrically connected with one end of first resistor；
The other end of first capacitor is electrically connected with No. 6 pins of opa551；
The other end of first resistor is electrically connected with No. 6 pins of opa551；
No. 2 pins of opa551 are electrically connected with one end of second resistance；
The other end of second resistance is electrically connected with the 4th port of first interface；
The third port of first interface is electrically connected with the transmission of electricity interface of Hall power supply circuit；
No. 3 pins of opa551 are electrically connected with one end of 3rd resistor；
No. 3 pins of opa551 are electrically connected with one end of the second capacitor；
No. 3 pins of opa551 are electrically connected with one end of the 4th resistance；
The other end of second capacitor is grounded；
The other end of 4th resistance is grounded；
The other end of 3rd resistor is electrically connected with the second port of first interface；
The first port of first interface is grounded；
No. 4 pins of opa551 connect power supply；
No. 4 pins of opa551 are electrically connected with one end of the 5th capacitor；
No. 4 pins of opa551 are electrically connected with one end of the 6th capacitor；
The other end of 5th capacitor is grounded；
The other end of 6th capacitor is grounded；
No. 7 pins of opa551 connect power supply；
No. 7 pins of opa551 are electrically connected with one end of third capacitor；
No. 7 pins of opa551 are electrically connected with one end of the 4th capacitor；
The other end of third capacitor is grounded；
The other end of 4th capacitor is grounded；
No. 6 pins of opa551 are electrically connected with the first port of second interface；
The second port of second interface is electrically connected with one end of sampling resistor；
The other end of sampling resistor is grounded.
As shown in figure 3, Hall power supply circuit includes LM317 chip, the 7th capacitor, the 8th capacitor, the 6th resistance and the 7th
Resistance, connection relationship are as follows:
No. 3 pins of LM317 chip connect power supply, and No. 3 pins of LM317 chip are electrically connected with one end of the 7th capacitor；
The other end of 7th capacitor is grounded；
No. 1 pin of LM317 chip is electrically connected with one end of the 6th resistance；
No. 1 pin of LM317 chip is electrically connected with one end of the 7th resistance；
The other end of 7th resistance is grounded；
The other end of 6th resistance and No. 2 pins of LM317 chip are grounded；
Transmission of electricity interface of No. 2 pins of LM317 chip as Hall power supply circuit, No. 2 pins of LM317 chip and the 8th
One end of capacitor is electrically connected；
The other end of 8th capacitor is grounded.
As shown in figure 4, the critical feature size figure of embodiment, the outer ring radius of Hall binding clip is 49mm, and inner ring radius is
35mm.The outsourcing apposition of Hall binding clip is insulated encapsulated layer, is rubber or Plastic organic insulating material, encapsulated layer thickness 1mm,
The coil wound on magnetic core and magnetic core constitutes outer radius 48mm, and inside radius is 36mm.Magnetic core size is inner ring radius 45mm, interior
Ring radius 39mm, sectional area are then 6mm multiplied by 6mm.Jaw sectional area is 14mm multiplied by 14mm.The lever size of the present embodiment is long
Degree is 200mm, width 70mm.There is liquid crystal display in lever side, can show current measurement result, battery capacity, wireless
The information such as connection status.
The working principle of the present embodiment section:
In conjunction with Fig. 1, iPRepresent tested electric current, ΦPRepresent the magnetic flux that tested electric current generates in the magnetic core of embodiment, ΦSGeneration
The magnetic flux that electric current in table bucking coil generates in the magnetic core of embodiment.ΦPAnd ΦSIt is contrary, the two offset after difference
Value ΦeHall element both ends in magnetic core air gap generate voltage difference Ve, VeAn electricity is generated by Voltage-current conversion unit
Flow IS, ISFlow into bucking coil, as magnetic flux ΦSExcitation source.Closed loop Hall uses negative-feedback principle, i.e., contrary
ΦPAnd ΦSCloser to equal, then hall sensing voltage difference VeIt is smaller, it is assumed that VeFor positive value, to VeClose to zero, then voltage-to-current
The I that converting unit generatesSThen to increase, such ΦSIt is bigger, closer to ΦP, until ΦPAnd ΦSIt is equal in magnitude, it is contrary；
If VeFor negative value, conversely, to VeClose to zero, then Voltage-current conversion unit generates ISThen to reduce, it is same until
ΦPAnd ΦSIt is equal in magnitude, it is contrary.VePositive and negative reality by the Voltage Reference direction at Hall element both ends depending on.Work as VeClosely
Seemingly it is after zero, according to electromagnetic coupling principle, electric current I in bucking coilSIt can be converted into according to the number of turns of bucking coil across magnetic core
Tested electric current.ISDigital signal is first converted to by sample circuit, then calculates tested size of current in algorithm analytical unit
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent；
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention.For those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
Exhaustion.Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention etc., should be included in
Within the protection scope of the utility model claims.
Claims (6)
1. a kind of tong-type ammeter, which is characterized in that including Hall binding clip, sampling resistor and control mould group, wherein
The Hall binding clip measures electric current by Hall element, obtains sample rate current；
Sample rate current is converted sampled voltage by the sampling resistor；
Sampled voltage is carried out signal processing by the control mould group, obtains the numerical value of measurement electric current；
Its connection relationship is as follows:
Hall binding clip is passed through on tested conducting wire, the output end of Hall binding clip is electrically connected with one end of sampling resistor；
The other end of the sampling resistor is electrically connected with the input terminal of control mould group；
The Hall binding clip includes Hall element circuit, Hall power supply circuit and induction coil, wherein
The Hall element circuit obtains sample rate current for amplifying the inductive signal of Hall element；
The Hall power supply circuit is powered Hall element；
The Hall element circuit includes opa551 chip, first resistor, second resistance, 3rd resistor, the 4th resistance, first
Capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, the 6th capacitor, first interface and second interface, wherein
The first interface includes four ports, and the first interface is for connecting Hall element；
The second interface includes two ports, and the second interface is for connecting induction coil；
Its connection relationship is as follows:
No. 2 pins of the opa551 are electrically connected with one end of first capacitor；
No. 2 pins of the opa551 are electrically connected with one end of first resistor；
The other end of the first capacitor is electrically connected with No. 6 pins of opa551；
The other end of the first resistor is electrically connected with No. 6 pins of opa551；
No. 2 pins of the opa551 are electrically connected with one end of second resistance；
The other end of the second resistance is electrically connected with the 4th port of first interface；
The third port of the first interface is electrically connected with the transmission of electricity interface of Hall power supply circuit；
No. 3 pins of the opa551 are electrically connected with one end of 3rd resistor；
No. 3 pins of the opa551 are electrically connected with one end of the second capacitor；
No. 3 pins of the opa551 are electrically connected with one end of the 4th resistance；
The other end of second capacitor is grounded；
The other end of 4th resistance is grounded；
The other end of the 3rd resistor is electrically connected with the second port of first interface；
The first port of the first interface is grounded；
No. 4 pins of the opa551 connect power supply；
No. 4 pins of the opa551 are electrically connected with one end of the 5th capacitor；
No. 4 pins of the opa551 are electrically connected with one end of the 6th capacitor；
The other end of 5th capacitor is grounded；
The other end of 6th capacitor is grounded；
No. 7 pins of the opa551 connect power supply；
No. 7 pins of the opa551 are electrically connected with one end of third capacitor；
No. 7 pins of the opa551 are electrically connected with one end of the 4th capacitor；
The other end of the third capacitor is grounded；
The other end of 4th capacitor is grounded；
No. 6 pins of the opa551 are electrically connected with the first port of second interface；
The second port of the second interface is electrically connected with one end of sampling resistor；
The other end of the sampling resistor is grounded；
The Hall power supply circuit includes LM317 chip, the 7th capacitor, the 8th capacitor, the 6th resistance and the 7th resistance, is connected
It is as follows to connect relationship:
No. 3 pins of the LM317 chip connect power supply, and No. 3 pins of LM317 chip are electrically connected with one end of the 7th capacitor；
The other end of 7th capacitor is grounded；
No. 1 pin of the LM317 chip is electrically connected with one end of the 6th resistance；
No. 1 pin of the LM317 chip is electrically connected with one end of the 7th resistance；
The other end of 7th resistance is grounded；
The other end of 6th resistance and No. 2 pins of LM317 chip are grounded；
Transmission of electricity interface of No. 2 pins of the LM317 chip as Hall power supply circuit, No. 2 pins of LM317 chip and
One end of eight capacitors is electrically connected；
The other end of 8th capacitor is grounded.
2. tong-type ammeter according to claim 1, which is characterized in that the Hall binding clip includes jaw type probe, institute
The shape for the jaw type probe stated is annular, and Hall binding clip includes the first movable binding clip and the second movable binding clip, described first
Movable binding clip and the second movable binding clip connection group circularize binding clip.
3. tong-type ammeter according to claim 2, which is characterized in that the vice jaw part setting of the movable binding clip of described first
There is dentalation, the vice jaw part of the described second movable binding clip is provided with dentalation, and the dentalation of the first movable binding clip
It is opposite with the second movable dentalation of binding clip, group is attached by engaged mode and circularizes binding clip.
4. tong-type ammeter according to claim 2 or 3, which is characterized in that Hall binding clip further includes Hall element, described
Hall element setting in the first movable binding clip or the second movable binding clip, and Hall element and the angle of jaw apart are 90
Degree.
5. tong-type ammeter according to claim 4, which is characterized in that the control mould group includes filter circuit, adopts
Sample circuit, micro-chip processor, display screen, wherein
Input terminal of the input terminal of the filter circuit as control mould group, the output end of filter circuit and sample circuit it is defeated
Enter end electrical connection；
The output end of the sample circuit is electrically connected with the input terminal of micro-chip processor；
First output end of the micro-chip processor is electrically connected with the input terminal of display screen.
6. tong-type ammeter according to claim 5, which is characterized in that the control mould group further includes radio communication mold
Block, the input terminal of the wireless communication module are electrically connected with the second output terminal of micro-chip processor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820400719 | 2018-03-22 | ||
| CN2018204007198 | 2018-03-22 |
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| CN201820417664.1U Active CN208239512U (en) | 2018-03-22 | 2018-03-26 | A kind of tong-type ammeter |
| CN201820413023.9U Active CN208239511U (en) | 2018-03-22 | 2018-03-26 | A kind of tong-type ammeter based on Hall effect |
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| CN112904071A (en) * | 2021-01-11 | 2021-06-04 | 浙江华云信息科技有限公司 | Zero-flux current transformer |
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