CN108459194A - A kind of two-wire system Hall-type current transducer - Google Patents
A kind of two-wire system Hall-type current transducer Download PDFInfo
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- CN108459194A CN108459194A CN201810424278.XA CN201810424278A CN108459194A CN 108459194 A CN108459194 A CN 108459194A CN 201810424278 A CN201810424278 A CN 201810424278A CN 108459194 A CN108459194 A CN 108459194A
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- WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The present invention discloses a kind of two-wire system Hall-type current transducer, the transmitter is mainly made of C-shaped magnet ring (1), Hall sensor (2), differential amplifier circuit (3), V/I conversion circuits (4), zero range adjustment circuit (5), two-wire system output loop (6) and common mode resistance-capacitance network (7), is tested electric current ImAcross C-shaped magnet ring (1), Hall sensor (2) is installed in the air gap of C-shaped magnet ring (1), the voltage output of Hall sensor (2) is connected to differential amplifier circuit (3), and the output of zero range adjustment circuit (5) is connected to differential amplifier circuit (3), the output of differential amplifier circuit (3) is connected to the input terminal of V/I conversion circuits (4), the output of V/I conversion circuits (4) is connected to two-wire system output loop (6), it is exported by two-wire system output loop (6) and transmits 4~20mA current signals, it is internal work loop power supply simultaneously.Circuit of the present invention is simple, cost-effective, easy-to-connect.
Description
Technical field
The invention patent relates to electrical detection technique and automation equipment fields, more specifically, the invention patent relates to
A kind of two-wire system Hall-type current transducer instrument.
Background technology
Current transducer is widely used in electrical energy measurement, power automation, relay protection, motor control, industry automatically
The AC or DC high current of tested major loop is converted to 4~20mA standard DC currents letter by the fields such as change by linear relationship
Number export and remote transmission.
Hall sensor is a kind of most common sensor measured to magnetic field or electric current, has high sensitivity, knot
The advantages that structure is simple, small, frequency response range is wide and service life is long, it is equal to the measurement in AC and DC magnetic field or electric current
It is applicable in, and suitable for the measurement of quiescent current and dynamic current, therefore current transducer is constructed by sensing element of Hall sensor
With unrivaled superiority.
Existing most of Hall-type current transducers use three-wire system or the four-wire system mode of connection, in addition to signal transmission is returned
Outside road, also need in addition to provide electric power loop for transmitter, wiring is complicated, of high cost, maintenance is inconvenient.2015 end of the year gram et al. public affairs
" Hall open-loop current transmitter power circuit " has been opened, three lines of one kind or four-wire system wiring are provided for Hall-type current transducer
The solution of mode power unit；Disclose within 2014 a kind of " rail type installation electric current pick-up based on Hall closed loop principle
Device ", the program use closed-loop feed-back type operation principle, and operating circuit structure is complex, and special power supply is needed to return
Road provides+Vc and two power supplys of-Vc therein, that is, needs to use the four-wire system mode of connection.
However, and existing most measuring instrumentss, PLC, DCS and other measure and control devices are all made of 4~20mA of standard two-wire system
The current signal mode of connection, therefore there is the current transducer for developing two-wire system 4~20mA standard signals great technology to develop valence
Value and the extensive market demand.
Two-wire system Hall-type current transducer requires Hall sensor and the total current of signal transformation performance loop to be less than
4mA, i.e. whole system need to carry out low power dissipation design, there is larger development difficulty.Patent of the present invention is two-wire system Hall-type electricity
The realization of flow transmitter provides a solution.
Patent of invention content
Patent of the present invention the technical problem to be solved is that overcoming three lines or four-wire system Hall-type current transducer,
A kind of solution of two-wire system Hall-type current transducer is provided so that measuring instrumentss, PLC, DCS or other measure and control device with
The two-wire system mode of connection may be used between Hall-type current transducer to be attached, with standard 4~20mA DC current signals
Carry out remote transmission.
In order to solve the technical problem, patent of the present invention provides a kind of two-wire system Hall-type current transducer, special
Sign is：The transmitter mainly by C-shaped magnet ring (1), Hall sensor (2), differential amplifier circuit (3), V/I conversion circuits (4),
Zero range adjustment circuit (5), two-wire system output loop (6) and common mode resistance-capacitance network (7) composition, are tested electric current ImAcross C-shaped
Magnet ring (1), Hall sensor (2) are installed in the air gap of C-shaped magnet ring (1), and the voltage output of Hall sensor (2) is connected to difference
Dynamic amplifying circuit (3), and the output of zero range adjustment circuit (5) is connected to differential amplifier circuit (3), differential amplifier circuit
(3) output is connected to the input terminal of V/I conversion circuits (4), and the output of V/I conversion circuits (4) is connected to two-wire system and exports back
Road (6), and the constant current source output terminal of V/I conversion circuits (4) is connected to the pumping signal input terminal of Hall sensor (2), and V/I turns
It changes circuit (4) constant pressure source output terminal and is connected to differential amplifier circuit (3) and the power end of zero range adjustment circuit (5), common mode resistance
The constant pressure source and constant-current source for the exciting current return terminal and V/I conversion circuits (4) that content network (7) is connected on Hall sensor (2) return
Between the reference ground returned.
The measurement of the two-wire system Hall-type current transducer and signal conversion plan are：In measurement process, C-shaped is passed through
The tested electric current I of magnet ring (1)mIt is generated and tested electric current I in magnet ringmThe directly proportional toroidal magnetic field of size, the magnetic field pass perpendicularly through
Hall sensor (2), and Hall sensor (2) is passed through the exciting current provided by V/I conversion circuits (4), therefore Hall sensor
(2) voltage output end output and tested electric current ImDirectly proportional weak voltage signals, the voltage signal is by differential amplification electricity
Road (3) is input to V/I conversion circuits (4) after being amplified, input voltage signal is converted to 4~20mA by V/I conversion circuits (4)
Electric current, and signal transmission is carried out by two-wire system output loop (6), and the adjustment signal of zero range adjustment circuit (5) output is defeated
Enter to differential amplifier circuit (3), the zero and range of current measurement can be adjusted, and V/I conversion circuits (4) export
Constant-current source is that Hall sensor (2) provides exciting current signal, exciting current return terminal of the constant-current source from Hall sensor (2)
The pressure drop for passing through common mode resistance-capacitance network (7) after outflow and generating is that differential amplifier circuit (3) provides certain common mode input electricity
Pressure, it is that zero range adjustment circuit (5) and differential amplifier circuit (3) provide work electricity that V/I conversion circuits (4), which export constant pressure source,
Source.
The C-shaped magnet ring (1) uses zinc-manganese ferrite bead, magnet ring to be radially provided with 2mm air gaps, the Hall sensor
(2) TO-92 is used to encapsulate linear hall sensor HG-302C, laminar Hall sensor (2) is parallelly mounted to C-shaped magnet ring
(1) air gap center.
The differential amplifier circuit (3) is made of high-precision, low-power consumption instrument amplifier AD627, Hall sensor (2)
Differential voltage output signal is connected to the differential input end of AD627.
Zero adjustment circuit in the zero range adjustment circuit (5) is by divider resistance, potentiometer and low-power consumption operation
The follower composition that amplifier MAX4480 is constituted, and the output of follower is connected to AD627 output references end；Zero range tune
Range adjustment circuit in whole circuit (5) is made of potentiometer, which is directly connected to the amplification factor adjustment resistance of AD627
Incoming end.
The V/I conversion circuits (4) are made of voltage/current transformation chip XTR105, and input voltage is linearly turned
It is changed to 4~20mA electric currents to be exported, while the chip exports 2 road 0.8mA constant-current sources, will be input to after 2 road constant-current source parallel connections
Hall sensor (2), as the excitation current source of Hall sensor (2), which also exports the constant pressure of 1 road 5.1V, 1mA capacity
Source, as differential amplifier circuit (3) and the working power of zero range adjustment circuit (5).
The differential amplifier circuit (3), the total power consumption of zero range adjustment circuit (5) are extremely low, and transmitter internal work returns
The total current on road is less than 4mA, so as to realize that with 4mA be the two-wire system electric current output for measuring zero.
The two-wire system output loop (6) is mainly by NPN type driving triode, overvoltage protection diode, diode rectification
Bridge, load resistance and external power supply composition, the diode rectifier bridge in circuit have a reverse connecting protection effect, external power supply can by times
Meaning direction access two-wire system output loop (6) is exported by two-wire system output loop (6) and transmits 4~20mA current signals, together
When be internal work loop power supply.
The common mode resistance-capacitance network (7) is by 2k Ω potentiometers RCMWith capacitance CCMParallel connection is constituted, and is connected on Hall sensor
(2) between the reference ground that the constant pressure source and constant-current source of exciting current return terminal and V/I conversion circuits (4) return, V/I conversions
The 1.6mA constant-current sources of circuit (4) output flow through common mode resistance-capacitance network (7), so as to by adjusting RCMResistance value be differential amplification
The work of device provides the common-mode voltage within the scope of 0~3.2V, and CCMThe ripple of the common-mode voltage can be filtered out.
The tested input current of the two-wire system Hall-type current transducer may be either that DC current is alternatively alternating current.
Patent of the present invention includes at least following advantageous effect：
(1) the two-wire system mode of connection and 4~20mA standard current signal transmission modes, transmitter power supply and signal is used to pass
Defeated to combine in same current loop, easy-to-connect, circuit are simple, cable cost is low, facilitate remote transmission.
(2) the measurement output signal of Hall sensor is handled and is converted using pure analog circuit, turned without analog/digital
It changes and digital signal processor, also without complicated closed-loop feedback circuit, operating circuit is simple in structure, of low cost, cost performance
It is high.
(3) the measurement zero of the Hall-type current transducer and range facilitate adjustment, the volt age offset of Hall sensor
And the offset voltage of differential amplifier and V/I converters can be offset by zero adjustment circuit, and hall sensing
Device uses constant current source forcing, and temperature coefficient is made to substantially reduce, therefore the current transducer high certainty of measurement.
(4) output loop has diode rectifier bridge, there is reversal connection protection function, two-wire system wiring to be distinguished without positive and negative anodes, outside
Output loop can be accessed by any direction by connecing power supply, transmitter will not be caused to damage because of the positive and negative anodes of misconnection power supply.
(5) the Hall-type current transducer is applied widely, is not only suitable for the measurement of DC current, is also applied for exchanging
The measurement of electric current is not only suitable for the measurement of dynamic current, is also applied for the measurement of quiescent current.
Part is illustrated to embody by further advantage, target and the feature of patent of the present invention by following, and part will also pass through
Research and practice to patent of the present invention and be understood by the person skilled in the art.
Description of the drawings
Fig. 1 is the theory of constitution schematic diagram of the two-wire system Hall-type current transducer described in patent of the present invention.
Fig. 2 is the specific implementation circuit diagram of the two-wire system Hall-type current transducer described in patent of the present invention.
Specific implementation mode
Patent of the present invention is described in further detail below in conjunction with the accompanying drawings, to enable those skilled in the art with reference to explanation
Book word can be implemented according to this.It should be appreciated that such as " having ", "comprising" and " comprising " term used herein are not arranged
Except the presence or addition of one or more of the other element or combinations thereof.
In order to solve the technical problem, patent of the present invention provides a kind of two-wire system Hall-type current transducer, special
Sign is：The transmitter mainly by C-shaped magnet ring (1), Hall sensor (2), differential amplifier circuit (3), V/I conversion circuits (4),
Zero range adjustment circuit (5), two-wire system output loop (6) and common mode resistance-capacitance network (7) composition, are tested electric current ImAcross C-shaped
Magnet ring (1), Hall sensor (2) are installed in the air gap of C-shaped magnet ring (1), and the voltage output of Hall sensor (2) is connected to difference
Dynamic amplifying circuit (3), and the output of zero range adjustment circuit (5) is connected to differential amplifier circuit (3), differential amplifier circuit
(3) output is connected to the input terminal of V/I conversion circuits (4), and the output of V/I conversion circuits (4) is connected to two-wire system and exports back
Road (6), and the constant current source output terminal of V/I conversion circuits (4) is connected to the pumping signal input terminal of Hall sensor (2), and V/I turns
It changes circuit (4) constant pressure source output terminal and is connected to differential amplifier circuit (3) and the power end of zero range adjustment circuit (5), common mode resistance
The constant pressure source and constant-current source for the exciting current return terminal and V/I conversion circuits (4) that content network (7) is connected on Hall sensor (2) return
Between the reference ground returned.
As shown in Figure 1, the measurement of the two-wire system Hall-type current transducer and signal conversion plan are：Measurement process
In, pass through the tested electric current I of C-shaped magnet ring (1)mIt is generated and tested electric current I in magnet ringmThe directly proportional toroidal magnetic field of size, the magnetic
Field passes perpendicularly through Hall sensor (2), and Hall sensor (2) is passed through the exciting current provided by V/I conversion circuits (4), therefore
Voltage output end output and the tested electric current I of Hall sensor (2)mDirectly proportional weak voltage signals, the voltage signal pass through
Differential amplifier circuit (3) is input to V/I conversion circuits (4) after being amplified, V/I conversion circuits (4) turn input voltage signal
It is changed to 4~20mA electric currents, and signal transmission is carried out by two-wire system output loop (6), and zero range adjustment circuit (5) output
Adjustment signal is input to differential amplifier circuit (3), can be adjusted to the zero and range of current measurement, and V/I is converted
Circuit (4) output constant current source is that Hall sensor (2) provides exciting current signal, which swashs from Hall sensor (2)
The pressure drop for passing through common mode resistance-capacitance network (7) after encouraging electrical return outflow and generating is that differential amplifier circuit (3) provides centainly
Input common mode voltage, V/I conversion circuits (4) export constant pressure source be zero range adjustment circuit (5) and differential amplifier circuit (3)
Working power is provided.
As shown in Figure 1, the C-shaped magnet ring (1) uses zinc-manganese ferrite bead, magnet ring is radially provided with 2mm air gaps, described
Hall sensor (2) is using TO-92 encapsulation linear hall sensor HG-302C, the parallel installation of laminar Hall sensor (2)
In the air gap center of C-shaped magnet ring (1).Tested electric current ImIt wears by air gap and vertically in the magnetic field that excitation generates in C-shaped magnet ring (1)
Cross two surfaces up and down of Hall sensor (2).
As shown in Fig. 2, the differential amplifier circuit (3) is made of high-precision, low-power consumption instrument amplifier AD627, Hall
The differential voltage output signal of sensor (2) is being connected to the differential input end of AD627, the i.e. voltage output of Hall sensor (2) just
End V+ is connected to the in-phase input end of AD627, and the voltage output negative terminal V- of Hall sensor (2) is connected to the anti-phase input of AD627
End.
Zero adjustment circuit in the zero range adjustment circuit (5) is by divider resistance, potentiometer and low-power consumption operation
The follower composition that amplifier MAX4480 is constituted, and the output of follower is connected to AD627 output references end；Zero range tune
Range adjustment circuit in whole circuit (5) is made of potentiometer, which is directly connected to the amplification factor adjustment resistance of AD627
Incoming end.Specific implementation mode is as shown in Fig. 2, upper and lower two divider resistance R1、R3With intermediate potentiometer R2Series connection, and by R2
Centre cap be connected to the homophase input of MAX4480, the inverting input of MAX4480 is connected to again after being connect with its output end
No. 5 pins of AD627, i.e. AD627 output references end, reference voltage V is provided for the output of AD627ref, wherein resistance parameter R1
=2.2M Ω, R2=200k Ω, R3=1M Ω, and ring current voltage VCC=5.1V, therefore the output reference voltage V of AD627ref
It can be adjusted within the scope of 1.5~1.8V；In addition, by 1k Ω adjustable potentiometers R4The amplification factor adjustment resistance of access AD627 connects
Enter end, i.e. between No. 1 pin and No. 8 pins, the range as transmitter adjusts resistance, the then output of differential amplifier circuit (3)
Voltage is represented by
Vo=(V+-V-)×(5+200/R4)+Vref (1)
In formula, (V+-V-) exported to the difference of AD627 differential input ends for the positive and negative end of voltage output of Hall sensor (2)
Dynamic voltage, output voltage V0It is input to the Differential Input anode of subsequent V/I conversion circuits (4).
As shown in Fig. 2, the V/I conversion circuits (4) are made of voltage/current transformation chip XTR105, it will input electricity
Pressure is linearly converted to 4~20mA electric currents and is exported, while the chip exports 2 road 0.8mA constant-current sources, simultaneously by 2 road constant-current sources
Hall sensor (2) is input to after connection, as the excitation current source of Hall sensor (2), which also exports 1 road 5.1V, 1mA
The constant pressure source of capacity, as differential amplifier circuit (3) and the working power of zero range adjustment circuit (5).Voltage/current is specific
Shift theory is：The output voltage V of differential amplifier circuit (3)0It is input to the Differential Input anode VIN+ of XTR105；R5=2.2M
Ω、R6=1M Ω series connection is followed by constant pressure source VCCBetween reference ground GND, series connection point generates 1.6V voltages and is connected to XTR105's
Differential Input negative terminal VIN- provides common-mode voltage for the work of XTR105；R7=1k Ω are connected to the amplification factor adjustment of XTR105
Resistance incoming end determines the voltage/current conversion coefficient of XTR105, then XTR105 is exported to two-wire system output loop (6)
Electric current is
I0=4+40 (V0-1.6)/R7 (2)
In formula, V0The output voltage of differential amplifier circuit (3), I0For output current.
The differential amplifier circuit (3), the total power consumption of zero range adjustment circuit (5) are extremely low, and transmitter internal work returns
The total current on road is less than 4mA, so as to realize that with 4mA be the two-wire system electric current output for measuring zero.It is specific each in conjunction with Fig. 2
Performance loop consumption Current calculation, which counts, is：R1、R2、R3It is 1.5 μ A, MAX4480 static working currents that series loop, which consumes electric current,
Maximum is no more than 100 μ A, AD627 static working current maximums and is no more than 85 μ A, R5、R6It is 1.6 μ A that series loop, which consumes electric current,
In addition the exciting current 1.6mA of Hall sensor (2), the total current of entire internal work circuit consumption are no more than 1.8mA, are less than
4mA, it is the two-wire system electric current output condition for measuring zero to meet with 4mA.
The two-wire system output loop (6) is mainly by NPN type driving triode, overvoltage protection diode, diode rectification
Bridge, load resistance and external power supply composition, the diode rectifier bridge in circuit have a reverse connecting protection effect, external power supply can by times
Meaning direction access two-wire system output loop (6) is exported by two-wire system output loop (6) and transmits 4~20mA current signals, together
When be internal work loop power supply.Specific implementation mode is as shown in Fig. 2, NPN type driving triode Q1Using 9014, to carry
High transmitter current fan-out capability reduces the fever of XTR105 chips, triode Q1Base stage be connected with No. 9 pins of XTR105, Q1
Emitter-base bandgap grading be connected with No. 8 pins of XTR105, Q1Collector be connected with No. 10 pins of XTR105 and be connected to diode rectification
One vertex of bridge；The overvoltage protection diode D5Using 36V Zener diode 1N4753, it is can absorb circuit surge current,
Play the role of overvoltage protection, and in overvoltage protection diode D5Both ends 0.1 μ F capacitances C in parallel3, play filter action；Institute
State diode rectifier bridge D1~D4It is made of 4 rectifier diode 1N4007, rectifier bridge stack is constituted by connection type as shown in the figure,
It can prevent reverse power connection so that the transmitter power supply wiring direction can arbitrarily exchange；In addition it is also necessary at the long-range end of transmitter
It terminates into+24V DC external power supplys and load resistance RL, constitute complete two-wire system output loop (6).In+24V DC power supply electricity
Under the action of gesture, charge flows through external power supply, diode rectifier bridge, XTR105 and driving triode in output loop (6)
9014 shunt circuits, load resistance RL, to form a current signal transfer access, finally in the current signal transfer access
In flow through 4~20mA current signals ,+24VDC external power supplys are by the current signal transfer access in output loop (6) simultaneously
Internal work loop power supply.
As shown in Fig. 2, the common mode resistance-capacitance network (7) is by 2k Ω potentiometers RCMWith capacitance CCMParallel connection is constituted, and is connected on
The reference ground that the constant pressure source and constant-current source of the exciting current return terminal of Hall sensor (2) and V/I conversion circuits (4) return it
Between, the 1.6mA constant-current sources of V/I conversion circuits (4) output flow through common mode resistance-capacitance network (7), so as to by adjusting RCMResistance value
The common-mode voltage within the scope of 0~3.2V, and 0.1 μ F capacitances C in parallel are provided for the work of differential amplifierCMThe common mode can be filtered out
The ripple of voltage.
In addition, in embodiments, in constant pressure source VCCThe C of parallel connection as shown in Figure 2 is gone back between reference ground GND1=
10μF、C2=0.1 capacitances of μ F two, to filter out the stability that ripple improves voltage source.
The tested input current of the two-wire system Hall-type current transducer may be either that DC current is alternatively alternating current.
When measuring DC current, potentiometer can be adjusted by zero and range and configure measurement relationship, in 0~I of measuring rangemaxIt is interior, pick-up
Device exports 4~20mA current signals by linear relationship；When measuring alternating current, potentiometer configuration can be adjusted by zero and range
Measurement relationship enables transmitter export 12mA current signals when input current is 0, when input is-ImaxWhen~0A, transmitter is pressed
Linear relationship exports 4~12mA current signals, and works as and input as 0A~+ImaxWhen, transmitter exports 12~20mA by linear relationship
Current signal.
Although the embodiment of patent of the present invention has been disclosed as above, not only in the description and the implementation
Listed utilization.It can be applied to the field of various suitable patents of the present invention completely.For those skilled in the art
Other modifications may be easily implemented.Therefore without departing from the general concept defined in the claims and the equivalent scope, this hair
Bright patent is not limited to specific details and legend shown and described herein.
Claims (10)
1. a kind of two-wire system Hall-type current transducer, it is characterised in that：The transmitter is mainly by C-shaped magnet ring (1), hall sensing
Device (2), differential amplifier circuit (3), V/I conversion circuits (4), zero range adjustment circuit (5), two-wire system output loop (6) and
Common mode resistance-capacitance network (7) forms, and is tested electric current ImAcross C-shaped magnet ring (1), Hall sensor (2) is installed on C-shaped magnet ring (1)
In air gap, the voltage output of Hall sensor (2) is connected to differential amplifier circuit (3), and zero range adjustment circuit (5) is defeated
Go out to be connected to differential amplifier circuit (3), the output of differential amplifier circuit (3) is connected to the input terminal of V/I conversion circuits (4), V/I
The output of conversion circuit (4) is connected to two-wire system output loop (6), and the constant current source output terminal of V/I conversion circuits (4) is connected to
The pumping signal input terminal of Hall sensor (2), V/I conversion circuits (4) constant pressure source output terminal be connected to differential amplifier circuit (3) and
The power end of zero range adjustment circuit (5), common mode resistance-capacitance network (7) are connected on the exciting current return terminal of Hall sensor (2)
Between the reference ground returned with the constant pressure source and constant-current source of V/I conversion circuits (4).
2. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：In measurement process, wear
Cross the tested electric current I of C-shaped magnet ring (1)mIt is generated and tested electric current I in magnet ringmThe directly proportional toroidal magnetic field of size, the magnetic field are hung down
Direct puncture crosses Hall sensor (2), and Hall sensor (2) is passed through the exciting current provided by V/I conversion circuits (4), therefore Hall
Voltage output end output and the tested electric current I of sensor (2)mDirectly proportional weak voltage signals, the voltage signal is by differential
Amplifying circuit (3) is input to V/I conversion circuits (4) after being amplified, input voltage signal is converted to 4 by V/I conversion circuits (4)
~20mA electric currents, and signal transmission, and the adjustment of zero range adjustment circuit (5) output are carried out by two-wire system output loop (6)
Signal is input to differential amplifier circuit (3), can be adjusted to the zero and range of current measurement, and V/I conversion circuits
(4) output constant current source is that Hall sensor (2) provides exciting current signal, excitation electricity of the constant-current source from Hall sensor (2)
The pressure drop for passing through common mode resistance-capacitance network (7) after stream return terminal outflow and generating is that differential amplifier circuit (3) provides certain be total to
Mould input voltage, it is that zero range adjustment circuit (5) and differential amplifier circuit (3) provide that V/I conversion circuits (4), which export constant pressure source,
Working power.
3. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The C-shaped magnet ring (1)
Using zinc-manganese ferrite bead, magnet ring is radially provided with 2mm air gaps, and the Hall sensor (2) is linear suddenly using TO-92 encapsulation
You are sensor HG-302C, and laminar Hall sensor (2) is parallelly mounted to the air gap center of C-shaped magnet ring (1).
4. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The differential amplification electricity
Road (3) is made of high-precision, low-power consumption instrument amplifier AD627, and the differential voltage output signal of Hall sensor (2) is connected to
The differential input end of AD627.
5. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The zero range tune
Zero adjustment circuit in whole circuit (5) is followed by what divider resistance, potentiometer and low consumed power operational amplifier MAX4480 were constituted
Device forms, and the output of follower is connected to AD627 output references end；Range adjustment electricity in zero range adjustment circuit (5)
It route potentiometer to constitute, which is directly connected to the amplification factor adjustment resistance incoming end of AD627.
6. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The V/I conversions electricity
Road (4) is made of voltage/current transformation chip XTR105, and it is defeated that input voltage is linearly converted to the progress of 4~20mA electric currents
Go out, while the chip exports 2 road 0.8mA constant-current sources, Hall sensor (2) will be input to after 2 road constant-current source parallel connections, as Hall
The excitation current source of sensor (2), which also exports the constant pressure source of 1 road 5.1V, 1mA capacity, as differential amplifier circuit (3)
And the working power of zero range adjustment circuit (5).
7. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterized in that：The differential amplifier circuit
(3), the total power consumption of zero range adjustment circuit (5) is extremely low, and the total current in transmitter internal work circuit is less than 4mA, so as to
To realize that with 4mA be the two-wire system electric current output for measuring zero.
8. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterized in that：The two-wire system exports back
Road (6) is mainly by NPN type driving triode, overvoltage protection diode, diode rectifier bridge, load resistance and external power supply group
At there is the diode rectifier bridge in circuit reverse connecting protection effect, external power supply can access two-wire system by any direction and export back
Road (6) exports by two-wire system output loop (6) and transmits 4~20mA current signals, while being internal work loop power supply.
9. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The common mode capacitance-resistance net
Network (7) is by 2k Ω potentiometers RCMWith capacitance CCMParallel connection constitute, and be connected on Hall sensor (2) exciting current return terminal and
Between the reference ground that the constant pressure source and constant-current source of V/I conversion circuits (4) return, the 1.6mA of V/I conversion circuits (4) output is permanent
Stream source stream crosses common mode resistance-capacitance network (7), so as to by adjusting RCMResistance value provide 0~3.2V models for the work of differential amplifier
Enclose interior common-mode voltage, and CCMThe ripple of the common-mode voltage can be filtered out.
10. a kind of two-wire system Hall-type current transducer according to claim 1, it is characterised in that：The two-wire system is suddenly
Your the tested input current of formula current transducer may be either that DC current is alternatively alternating current.
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| CN112798867A (en) * | 2020-12-28 | 2021-05-14 | 北京东方计量测试研究所 | Base for realizing combined quantum Hall resistance sample |
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