CN209167415U - The diverter unit of high-accuracy heavy-current detection - Google Patents
The diverter unit of high-accuracy heavy-current detection Download PDFInfo
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- CN209167415U CN209167415U CN201821928228.7U CN201821928228U CN209167415U CN 209167415 U CN209167415 U CN 209167415U CN 201821928228 U CN201821928228 U CN 201821928228U CN 209167415 U CN209167415 U CN 209167415U
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- sampling
- current
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- circuit board
- diverter unit
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Abstract
The utility model discloses a kind of diverter units of high-accuracy heavy-current detection comprising sampling resistor and sampling circuit board and LCD display.Sampling resistor is equipped with screw thread guide post and sampling column for connecting DC current lead.Sampling circuit board is equipped with thieff hatch corresponding with sampling column, and sampling column is plugged in its corresponding thieff hatch.Sampling circuit board is equipped with difference amplifier, ADC converter, ARM microcontroller and the CAN bus isolator being sequentially connected electrically, two input terminals of difference amplifier are connect with two thieff hatch respectively, first output end of ARM microcontroller is connect with LCD display, its second output terminal is connect with the input terminal of CAN bus isolator, and the output end of CAN bus isolator is connect with host computer.The beneficial effects of the utility model are to promote the detection accuracy to electric current.
Description
Technical field
The utility model relates to the technical field of current detecting, in particular to a kind of current divider of high-accuracy heavy-current detection
Device.
Background technique
Checking of great current is chiefly used in measuring the operating current in electric motor of automobile, driving machinery and industrial system.Traditional is big
Electric current electrical measurement scheme is detected using hall principle, and there are electromagnetic interference, outside need increases outside shielding metal this detection mode
Shell, induction coil installation are inconvenient；Meanwhile current transformer and some additional elements are needed, it is at high cost；There is lag in magnetic core
With reset non-return-to-zero, the precision of current detecting is influenced.
Utility model content
In view of the problems of the existing technology, the main purpose of the utility model is to provide a kind of high-accuracy heavy-current detection
Diverter unit, it is intended to promoted to the detection accuracy of electric current.
To achieve the above object, the utility model proposes high-accuracy heavy-current detection diverter unit comprising adopt
Sample resistance and sampling circuit board and LCD display.The sampling resistor includes copper-manganese sampling sheet, and the two of the copper-manganese sampling sheet
End is respectively equipped with conductive sheet, and the conductive sheet is equipped with first through hole far from one end of copper-manganese sampling sheet, sets in the first through hole
There is the screw thread guide post for connecting DC current lead, DC current to be detected flows into sampling resistor from current feed.It is described
Conductive sheet is equipped with the second through-hole close to one end of copper-manganese sampling sheet, is equipped with sampling column, the sample circuit in second through-hole
Plate is equipped with thieff hatch corresponding with the sampling column, and the sampling column is plugged in its corresponding thieff hatch.
The sampling circuit board be equipped be sequentially connected electrically difference amplifier, ADC converter, ARM microcontroller and
Two input terminals of CAN bus isolator, the difference amplifier are connect with two thieff hatch respectively, and the of the ARM microcontroller
One output end is connect with LCD display, and second output terminal is connect with the input terminal of CAN bus isolator, the CAN bus every
Output end from device is connect with host computer.
Preferably, the difference amplifier is the amplifier for inhibiting function with enhanced PWM.
Preferably, the model ADS1118 of the ADC converter.
Preferably, the model STM32F042 of the ARM microcontroller.
Preferably, the resistance value of the sampling resistor is between 10 micro-ohms~250 micro-ohms.
Preferably, the CAN bus isolator is isolating device.
The technical solution of the utility model carrys out inverse by using the voltage of Differential Detection sampling resistor and goes out electric current to be detected
Size, for electric current to be detected mainly from sampling resistor effluent mistake, the electric current of sampling column is very small, and equivalent impedance is big, reduces
The wave noise voltage of electric current, electric current to be detected are accurately measured by the voltage decline at measurement sampling resistor both ends；Resistance
It is detected using four line of Kelvin, separates the electrode of electric current and voltage, eliminate wiring and the impedance of contact resistance；Sampling resistor
Sampling column is directly connected on the difference amplifier of sampling circuit board, is eliminated connecting lead wire itself and external magnetic field and is examined to electric current
Survey the influence of result；Hardware port is constructed using CAN bus isolator, the ground loop of CAN bus can be separated well, subtracted
Ground wire loop current between small CAN bus node effectively promotes the detection accuracy to electric current to reduce common mode interference；Pass through
Increase LCD display, intuitively electric current electrical measurement can be come out as the result is shown, facilitate test and application.
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, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the connection schematic diagram of the utility model sampling resistor and sampling circuit board；
Fig. 2 is the structural schematic diagram of the utility model sampling resistor；
Fig. 3 is the functional block diagram of the utility model current detecting；
The utility model aim is realized, the embodiments will be further described with reference to the accompanying drawings for functional characteristics and advantage.
Specific embodiment
The utility model proposes a kind of diverter units of high-accuracy heavy-current detection.
Referring to Fig.1-3, Fig. 1 is the connection schematic diagram of the utility model sampling resistor and sampling circuit board, and Fig. 2 is that this is practical
The structural schematic diagram of novel sampling resistance, Fig. 3 are the functional block diagram of the utility model sampling circuit board sampling.
As shown in Figure 1-3, the diverter unit of high-accuracy heavy-current detection includes adopting in the utility model embodiment
Sample resistance 100 and sampling circuit board 200 and LCD display, the both ends of sampling resistor 100 are respectively set on two mounting plates.It adopts
Sample resistance 100 includes copper-manganese sampling sheet 110, and the both ends of copper-manganese sampling sheet 110 are respectively equipped with conductive sheet 120, and conductive sheet 120 is separate
One end of copper-manganese sampling sheet 110 is equipped with first through hole 121, and the spiral shell for connecting DC current lead is equipped in first through hole 121
Line guide post 122, DC current to be detected flow into sampling resistor 100 from current feed.Conductive sheet 120 is close to copper-manganese sampling sheet
110 one end is equipped with the second through-hole, and sampling column 123 is equipped in the second through-hole, and sampling circuit board 200 is equipped with and sampling column 123
Corresponding thieff hatch 201, sampling column 123 are plugged in its corresponding thieff hatch 201.Sampling circuit board 200 is equipped with successively electric
Difference amplifier 210, ADC converter 220, ARM microcontroller 230 and the CAN bus isolator 240 of connection, differential amplification
Two input terminals of device 210 are connect with two thieff hatch 201 respectively, the first output end and LCD display 300 of ARM microcontroller 230
Connection, second output terminal connect with the input terminal of CAN bus isolator 240, the output end of CAN bus isolator 240 with it is upper
Position machine 400 connects.
In the present embodiment, hardware port is constructed by CAN bus isolator 240, CAN bus can be separated well
Ground loop reduces the ground wire loop current between CAN bus node, to reduce common mode interference, effectively promotes the inspection to electric current
Survey precision.
In the present embodiment, difference amplifier 210 is the zero shift difference amplifier for inhibiting function with enhanced PWM
210, for example, by using the amplifier of model INA240-Q1, which is voltage output, current sense amplifier, has and increases
Strong type PWM inhibits function, can detect on current divider resistance in -4V to the 80V wide common-mode voltage range independently of supply voltage
Pressure drop, can accurately measure electric current, without making output voltage generate biggish transition and restoring ripple accordingly.
In the present embodiment, ADC converter 220 uses a high-precision low-power consumption 16 of model ADS1118
Analog-digital converter, for the converter, it can be achieved that 60 microvolts measure within the scope of 0-2V, and built-in temperature sensors of high precision can
For system-level monitoring temperature and temperature-compensating.
In the present embodiment, ARM microcontroller 230 uses the STM32F042 processing of the STM32F0 series of low cost
Device, the processor are a based on ARM Cortex-M0 processor, and dominant frequency 48MHz has taken into account sampling circuit board 200 to size
With the demand of external interface.
In the present embodiment, the resistance value of sampling resistor 100 is between 10 micro-ohms~250 micro-ohms.By using low resistance
Resistance can effectively reduce resistance heating amount, promote electric current handling capacity.In conjunction with 0 drift used on sampling circuit board 200
Difference amplifier 210, can effective lifting device to the measurement accuracy of electric current.
In the present embodiment, which is isolating device, it can be achieved that high-tension measurement, is interfered small.
The technical solution of the utility model carrys out inverse by using the voltage of Differential Detection sampling resistor 100 and goes out electricity to be detected
The size of stream, electric current to be detected is mainly from 100 effluent mistake of sampling resistor, and the electric current of sampling column 123 is very small, equivalent impedance
Greatly, reduce the wave noise voltage of electric current, electric current to be detected declines accurate by the voltage at measurement 100 both ends of sampling resistor
Ground measurement；Resistance is detected using four line of Kelvin, is separated the electrode of electric current and voltage, is eliminated wiring and the resistance of contact resistance
It is anti-；The sampling column 123 of sampling resistor 100 is directly connected on the difference amplifier 210 of sampling circuit board 200, eliminates connection
The influence of lead itself and external magnetic field to current detecting result；Hardware port is constructed using CAN bus isolator 240, it can
The ground loop for separating CAN bus well, reduces the ground wire loop current between CAN bus node, thus reduce common mode interference,
Effectively promote the detection accuracy to electric current；By increase LCD display 300, intuitively electric current electrical measurement can be come out as the result is shown,
Facilitate test and application.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (6)
1. a kind of diverter unit of high-accuracy heavy-current detection, which is characterized in that including sampling resistor and sampling circuit board with
And LCD display；The sampling resistor includes copper-manganese sampling sheet, and the both ends of the copper-manganese sampling sheet are respectively equipped with conductive sheet, institute
It states conductive sheet and is equipped with first through hole far from one end of copper-manganese sampling sheet, be equipped in the first through hole and draw for connecting DC current
The screw thread guide post of line, DC current to be detected flow into sampling resistor from current feed；The conductive sheet is close to copper-manganese sampling sheet
One end be equipped with the second through-hole, sampling column is equipped in second through-hole, the sampling circuit board is equipped with and the sampling column
Corresponding thieff hatch, the sampling column are plugged in its corresponding thieff hatch；
It is total that the sampling circuit board is equipped with difference amplifier, ADC converter, ARM microcontroller and the CAN being sequentially connected electrically
Two input terminals of line isolator, the difference amplifier are connect with two thieff hatch respectively, the first output of the ARM microcontroller
End is connect with LCD display, and second output terminal is connect with the input terminal of CAN bus isolator, the CAN bus isolator
Output end is connect with host computer.
2. the diverter unit of high-accuracy heavy-current detection as described in claim 1, which is characterized in that the difference amplifier
For the amplifier for inhibiting function with enhanced PWM.
3. the diverter unit of high-accuracy heavy-current detection as described in claim 1, which is characterized in that the ADC converter
Model ADS1118.
4. the diverter unit of high-accuracy heavy-current detection as described in claim 1, which is characterized in that the ARM microcontroller
The model STM32F042 of device.
5. the diverter unit that the high-accuracy heavy-current as described in claim 1-4 any one detects, which is characterized in that described
The resistance value of sampling resistor is between 10 micro-ohms~250 micro-ohms.
6. the diverter unit of high-accuracy heavy-current as described in claim 1 detection, which is characterized in that the CAN bus every
It is isolating device from device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928228.7U CN209167415U (en) | 2018-11-21 | 2018-11-21 | The diverter unit of high-accuracy heavy-current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928228.7U CN209167415U (en) | 2018-11-21 | 2018-11-21 | The diverter unit of high-accuracy heavy-current detection |
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| Publication Number | Publication Date |
|---|---|
| CN209167415U true CN209167415U (en) | 2019-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821928228.7U Active CN209167415U (en) | 2018-11-21 | 2018-11-21 | The diverter unit of high-accuracy heavy-current detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449064A (en) * | 2023-03-12 | 2023-07-18 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
-
2018
- 2018-11-21 CN CN201821928228.7U patent/CN209167415U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116449064A (en) * | 2023-03-12 | 2023-07-18 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
| CN116449064B (en) * | 2023-03-12 | 2023-10-31 | 深圳市开步电子有限公司 | Shunt, electric equipment and energy storage equipment thereof |
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