CN107168437B - A kind of bipolar current source - Google Patents
A kind of bipolar current source Download PDFInfo
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- CN107168437B CN107168437B CN201710537737.0A CN201710537737A CN107168437B CN 107168437 B CN107168437 B CN 107168437B CN 201710537737 A CN201710537737 A CN 201710537737A CN 107168437 B CN107168437 B CN 107168437B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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Abstract
The application discloses a kind of bipolar current source, including proportional integration computing module, the first power operational amplifier, load, inspection flow module, first resistor, second resistance and power supply circuit, wherein, it is accurately calculated using proportional integration module, power amplification is carried out using the first power operational amplifier, realize that load output electric current is directly proportional to input voltage, output current analog is controllable；And due to realizing the amplification of electric current using the first power operational amplifier, so that output electric current is larger, several amperes can be reached；Since the first power operational amplifier can be realized positive negative output, so as to obtain bipolar current source.
Description
Technical field
The invention belongs to current source technology field more particularly to a kind of bipolar current sources.
Background technique
Cold atom, cold atoms, nuclear magnetic resonance (NMR), superconducting quantum interference device (SQUID,
Superconducting quantum interference device) etc. need in coil galvanization to generate in experiment
It realizes and atom is manipulated in magnetic field (Magneto-Optical Trap, magnetic well).
But according to different experiment scenes, in the actual operation process, there is different requirements to the electric current being passed through in coil,
Such as, at the magnetic field for needing to generate specific waveforms, the size of electric current need to be simulated controllably；Needed for needing to generate under fixed inductance
When magnetic field, electric current is needed to reach several amperes；Electric current is needed to generate opposing magnetic field in some experiments, it is therefore desirable to Bipolar current
Source.
How to provide that a kind of simulation is controllable, and electric current can reach several amperes of bipolar current source becomes urgent need to resolve
Problem.
Summary of the invention
In view of this, the present invention provides a kind of bipolar current source, to meet, simulation is controllable, electric current reaches several amperes and double
The requirement of polar form.
To achieve the above object, the invention provides the following technical scheme:
A kind of bipolar current source, comprising:
Proportional integration computing module, the first power operational amplifier, load, inspection flow module, first resistor, second resistance and
Power supply circuit；
The proportional integration computing module includes resistor network, the first operational amplifier and integrating capacitor；The ratio product
Point computing module includes first input end, the second input terminal, third input terminal and output end, first operational amplifier it is defeated
Outlet is connected with one end of the integrating capacitor, the output end as the proportional integration computing module；The first input end
For inputting predeterminated voltage, second input terminal is used for input reference voltage, and the third input terminal is for receiving feedback electricity
Signal；
The positive input terminal of first power operational amplifier is connected with the output end of the proportional integration computing module；
The output end of first power operational amplifier is connected with one end of the first resistor；
The other end of the first resistor is connected with one end of the second resistance；
The negative input end of the common end of the first resistor and the second resistance and first power operational amplifier
It is connected；
The other end of the second resistance is grounded；
The detection module includes the first terminals, the second terminals and voltage output end；
The load is located at the first terminals of the inspection flow module and the output end of first power operational amplifier
Between, the second terminals ground connection of the inspection flow module or the load are located at second terminals for examining flow module and ground
Between, the first terminals of the inspection flow module are connected with the output end of first power operational amplifier；
The inspection flow module is used to detect the electric current Jing Guo the load, and the voltage output end and the proportional integration are transported
The third input terminal for calculating module is connected；
The power supply circuit and first operational amplifier, first power operational amplifier and the inspection flow module
It is respectively connected with.
It can be seen via above technical scheme that bipolar current source provided by the invention, including proportional integration computing module,
First power operational amplifier, load, inspection flow module, first resistor, second resistance and power supply circuit, wherein using ratio product
Sub-module is accurately calculated, using the first power operational amplifier carry out power amplification, realize load output electric current with it is defeated
It is directly proportional to enter voltage, output current analog is controllable；And due to realizing the amplification of electric current using the first power operational amplifier, so that
It is larger to export electric current, several amperes can be reached；Since the first power operational amplifier can be realized positive negative output, so as to
To bipolar current source.
Further, since bipolar current source of the invention uses the first power operational amplifier, first power
Operational amplifier is relative to bipolar junction transistor or MOSFET (metal oxide semiconductcor field effect transistor, Metal-
Oxide-Semiconductor Field-Effect Transistor), have noise is small, common mode inhibition, power supply rejection ratio compared with
High feature, bipolar current source provided by the invention also have the characteristics that low noise, common mode inhibition, power supply rejection ratio are higher,
Low Noise Design enables to the output current control accuracy of bipolar current source higher, and Bipolar current provided by the invention
Source structure is simple, no dead zone voltage, can be realized cold atom, cold atoms, nuclear magnetic resonance (NMR), superconducting quantum interference device
Deng accurate magnetic field control in experiment, such as three-dimensional magnetic field compensation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural block diagram of bipolar current source provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of another bipolar current source provided in an embodiment of the present invention；
Fig. 3 is a kind of low dropout linear regulator structure schematic diagram provided in an embodiment of the present invention；
Fig. 4 is the specific knot for the bipolar current source that a kind of inspection flow module provided in an embodiment of the present invention is located at load rear end
Structure schematic diagram；
Fig. 5 is the specific knot for the bipolar current source that a kind of inspection flow module provided in an embodiment of the present invention is located at loading nose
Structure schematic diagram；
Fig. 6 is the specific of the bipolar current source that another inspection flow module provided in an embodiment of the present invention is located at loading nose
Structural schematic diagram；
Fig. 7 is the specific of the bipolar current source that another inspection flow module provided in an embodiment of the present invention is located at load rear end
Structural schematic diagram；
Fig. 8 is the specific of the bipolar current source that another inspection flow module provided in an embodiment of the present invention is located at loading nose
Structural schematic diagram；
Fig. 9 is the specific structure signal of the bipolar current source of concatenated power operational amplifier provided in an embodiment of the present invention
Figure.
Specific embodiment
Just as described in the background section, according to different experiment scenes, in the actual operation process, to being passed through in coil
Electric current have different requirements.
In the prior art by operational amplifier build obtain current source, such as Howland Current Pump type electric current
Source etc., but its driving current is small, usually only several hundred milliamperes；The current source for realizing more high current carries out electric current using MOSFET
Control, but usually single polarity current source, and general commercial controlled current source is usually single polarity current source, it is difficult to it carries out
Positive negative bipolar is adjusted；And existing bipolar controllable electric power, not only its internal structure is complicated, also when input voltage is close to 0,
There is one section of dead zone voltage, it is 0 which, which exports electric current,；And several amperes of simulation controls bipolar current source usually using operation amplifier
Push-and-pull grade (push-pull stage) Lai Shixian that device drives a pair of of bipolar junction transistor (BJT) to form, to realize simulation control
System, it is also necessary to carry out inspection stream feedback.However the precision of general this current source is not very high, common mode inhibition, power supply rejection ratio one
As.
Based on this, the present invention provides a kind of bipolar current source, comprising:
Proportional integration computing module, the first power operational amplifier, load, inspection flow module, first resistor, second resistance and
Power supply circuit；
The proportional integration computing module includes resistor network, the first operational amplifier and integrating capacitor；The ratio product
Point computing module includes first input end, the second input terminal, third input terminal and output end, first operational amplifier it is defeated
Outlet is connected with one end of the integrating capacitor, the output end as the proportional integration computing module；The first input end
For inputting predeterminated voltage, second input terminal is used for input reference voltage, and the third input terminal is for receiving feedback electricity
Signal；
The positive input terminal of first power operational amplifier is connected with the output end of the proportional integration computing module；
The output end of first power operational amplifier is connected with one end of the first resistor；
The other end of the first resistor is connected with one end of the second resistance；
The negative input end of the common end of the first resistor and the second resistance and first power operational amplifier
It is connected；
The other end of the second resistance is grounded；
The detection module includes the first terminals, the second terminals and voltage output end；
The load is located at the first terminals of the inspection flow module and the output end of first power operational amplifier
Between, the second terminals ground connection of the inspection flow module or the load are located at second terminals for examining flow module and ground
Between, the first terminals of the inspection flow module are connected with the output end of first power operational amplifier；
The inspection flow module is used to detect the electric current Jing Guo the load, and the voltage output end and the proportional integration are transported
The third input terminal for calculating module is connected；
The power supply circuit and first operational amplifier, first power operational amplifier and the inspection flow module
It is respectively connected with.
Bipolar current source provided by the invention, including it is proportional integration computing module, the first power operational amplifier, negative
It carries, examine flow module, first resistor, second resistance and power supply circuit, wherein it is accurately calculated using proportional integration module, then
Power amplification is carried out by the first power operational amplifier, realizes that load output electric current is directly proportional to input voltage, exports electric current
Simulation is controllable；And due to realizing the amplification of electric current using the first power operational amplifier, so that output electric current is larger, can reach
Several amperes；Since the first power operational amplifier can be realized positive negative output, so as to obtain bipolar current source.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Figure 1, Fig. 1 is a kind of structural block diagram for bipolar current source that one embodiment of the invention provides, such as Fig. 1 institute
Show, the bipolar current source includes: proportional integration computing module 1, the first power operational amplifier 2, load 3, inspection flow module
4, first resistor R1, second resistance R2 and power supply circuit (not shown)；Proportional integration computing module 1 includes resistor network
11, the first operational amplifier 12 and integrating capacitor C1；Proportional integration computing module 1 includes first input end, the second input terminal, the
The output end of three input terminals and output end, the first operational amplifier 12 is connected with one end of integrating capacitor C1, as proportional integration
The output end of computing module 1；First input end is used for input reference voltage Vref for inputting predeterminated voltage, the second input terminal,
Third input terminal is for receiving feedback electric signal；The positive input terminal and proportional integration computing module 1 of first power operational amplifier 2
Output end be connected；The output end of first power operational amplifier 2 is connected with one end of first resistor R1；First resistor R1's is another
One end is connected with one end of second resistance R2；The common end of first resistor R1 and second resistance R2 and the first power operational amplifier
2 negative input end is connected；The other end of second resistance R2 is grounded；Examining flow module 4 includes the first terminals, the second terminals and electricity
Press output end；The output end of first power operational amplifier 2 is connected with one end of load 3；The other end and inspection flow module of load 3
4 the first terminals are connected；The second terminals for examining flow module 4 are grounded GND, and the first terminals and second of inspection flow module 4 connect
Line end examines flow module 4 for detecting the electric current through overload 3 by the electric current through overload 3；Examine the voltage output of flow module 4
End is connected with the third input terminal of proportional integration computing module 1；Power supply circuit and the first operational amplifier 12, the first Power arithmetic
Amplifier 2 and inspection flow module 4 are respectively connected with.
In bipolar current source shown in FIG. 1, inspection flow module 4 is located at the rear end of load 3.It should be noted that in this hair
In bright other embodiments, inspection flow module 4 may be located on the front end of load 3, as shown in Fig. 2, being provided in an embodiment of the present invention
The structural block diagram of another bipolar current source loads 3 at this time and is located between the second terminals and ground GND of inspection flow module 4, inspection
First terminals of flow module 4 are connected with the output end of the first power operational amplifier 2.
Proportional integration module 1 is in the embodiment of the present invention for realizing accurate PI (proportional integration) operation, therefore, the present invention
The first operational amplifier 12 is precision operational-amplifier in embodiment, and the proportional parts of precision operational-amplifier passes through resistor network
11 realize that integral part realizes by integrating capacitor C1, the not material of Definite Integral capacitor C1 in the present embodiment, in order to enable accumulating
Divide the leakage current of capacitor C1 smaller, so that PI operation offset is smaller, optional in the present embodiment, integrating capacitor C1 is poly- third
Alkene capacitor.
In the embodiment of the present invention, the first operational amplifier 12 and the composition two-stage calculation amplification of the first power operational amplifier 2
Device structure, wherein 12 the first power operational amplifier of output driving 2 of the first operational amplifier is electric come the bipolarity for generating several amperes
Stream.First power operational amplifier is connected into ratio enlargement mode, the load of output voltage driving coil, and specific connection type please join
As shown in Figure 1 and shown in Fig. 2.
Two-stage calculation amplifier structure is used in the embodiment of the present invention, previous stage precision operational-amplifier is completed PI operation and subtracted
Small noise, rear stage power operational amplifier complete electric current output.Power dissipation is in power operational amplifier when High-current output
On, temperature can change, and carry out PI operation using previous stage operational amplifier and effectively reduce temperature drift.Two-stage calculation amplifier
Structure makes current driving ability reach several ampere-hours to still ensure that extremely low noise.Using power operational amplifier compared to a pair
The push-and-pull grade of BJT pipe composition has the characteristics such as better common mode inhibition, power supply inhibition, and power operational amplifier integrated chip is certainly
Band overheat protector, the functions such as maximum current limitation are convenient and practical.
The first operational amplifier and the first power operational amplifier are required to power supply circuit power supply and carry out work in the present embodiment
Make, do not limit the specific structure of power supply circuit in the present embodiment, optionally, power supply circuit is the LDO (low of extremely low noise
Dropout regulator, low pressure difference linear voltage regulator).The LDO of low noise can reduce the noise of circuit and power supply inhibits
Than etc..
Fig. 3 is referred to, is a kind of structural schematic diagram of low noise LDO provided in an embodiment of the present invention, comprising: LDO+ module
51, LDO- module 52, the first DC power supply 53 and the second DC power supply 54, their connection relationship as shown in figure 3, power supply it is defeated
Voltage (+V ,-V) resupplies other chips by LDO pressure stabilizing output (V+, V-) out.It should be noted that the present invention and unlimited
The concrete form for determining low noise LDO power supply circuit, according to different LDO models or function, power supply circuit can also be other companies
The structure of mode is connect, is not limited this in the present embodiment.
It should be noted that first power operational amplifier itself has compared with low noise, power supply circuit in the present embodiment
It can directly power for power supply, need not move through pressure stabilizing；And the power supply circuit of the first operational amplifier is preferably low noise LDO, electricity
Source output voltage supplies the first operational amplifier after pressure stabilizing, to reduce the noise in PI calculating process, improves PI operation essence
Degree.
The concrete form of unlimited fixed load in the present embodiment, it should be noted that due to device selected in the embodiment of the present invention
Part bandwidth is larger, and feedback response speed is fast, and the first power operational amplifier has the current source in the embodiment of the present invention
Higher inductance driving capability, fast response time, therefore, load can be inductance in the embodiment of the present invention.When load is inductance
When, current source can make fast current switch and use, no ring.In other embodiments of the invention, load can also be electricity
It hinders, is not limited this in the present embodiment.
As depicted in figs. 1 and 2, the voltage signal of the input terminal of proportional integration computing module can be by the embodiment of the present invention
External input analog signal can also be provided by inside input, and the internal input refers to input voltage by providing with the present invention
Bipolar current source the offer of the structure on the same circuit production plate is provided, optional internal input includes internal reference electricity
Pressure and Low Drift Temperature slide rheostat provide.For the precision for guaranteeing internal setting signal, low noise is preferably used in the present embodiment
Reference voltage source provides reference voltage, and is divided by Low Drift Temperature slide rheostat to generate low noise and internal input voltage is arranged
Signal.It is positive two kinds of situations of negative level and positive level to adapt to incoming level, is provided partially in the present embodiment using reference voltage source
It sets, selects one of two different input patterns as input using wire jumper.
It should be noted that proportional integration module further includes the one end being connected with reference voltage Vref, root in the present embodiment
It is different according to the setting value of reference voltage Vref, positive negative level input and positive level input may be implemented, the positive negative level inputs,
Such as reference voltage Vref=0V, i.e., proportional integration module one end ground connection, inside input or external input connect voltage range be-
4V -+4V, corresponding load both ends output -10A -+10A electric current.The positive level input, it is interior such as reference voltage Vref=10V
It is 1V -9V that portion's input or external input, which connect voltage range, corresponding load both ends output -10A -+10A electric current.
It is defeated through PI computing module 1 after controllable voltage signal to PI computing module 1 is simulated in inside input in the present embodiment
It is exported again to the first power operational amplifier 2 to load 3 out, 3 both ends of load export electric current.Due to the first power operational amplifier
2 input voltage signal can just be born, so that the output electric current at load both ends can just be born, to obtain bipolar current source.
Bipolar current source provided by the invention, including it is proportional integration computing module, the first power operational amplifier, negative
It carries, examine flow module, first resistor, second resistance and power supply circuit, wherein it is accurately calculated using proportional integration module, then
Power amplification is carried out by the first power operational amplifier, realizes that load output electric current is directly proportional to input voltage, exports electric current
Simulation is controllable；And due to realizing the amplification of electric current using the first power operational amplifier, so that output electric current is larger, can reach
Several amperes；Since the first power operational amplifier can be realized positive negative output, so as to obtain bipolar current source.
Further, since bipolar current source of the invention uses the first power operational amplifier, first power
Operational amplifier is relative to bipolar junction transistor or MOSFET, small, common mode inhibition, the higher spy of power supply rejection ratio with noise
Point, bipolar current source provided by the invention also have the characteristics that low noise, common mode inhibition, power supply rejection ratio are higher, low noise
Design enables to the output current control accuracy of bipolar current source higher, and Bipolar current source structure provided by the invention
Simply, no dead zone voltage can be realized magnetic field control accurate in cold atom experiment, such as three-dimensional magnetic field compensates atom pair magnetic field
Sensitive experiment.
As shown in figure 4, being a kind of bipolar current source provided in an embodiment of the present invention, wherein with bipolarity shown in FIG. 1
Unlike current source, the specific resistor network and inspection flow module that are provided in the present embodiment.
Wherein, resistor network includes: 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the electricity of the 6th resistance R6 and the 7th
Hinder R7；Wherein, one end of 3rd resistor R3 and the negative input end of the first operational amplifier 412 and one end of the 7th resistance R7
It is connected, the other end of ratio capacitor C1 is connected with the other end of the 7th resistance R7；The other end of 3rd resistor R3 is as ratio product
The third input terminal for dividing computing module 41, for receiving feedback electric signal；One end of 4th resistance R4 and the first operational amplifier
412 negative input end is connected；Second input terminal of the other end of 4th resistance R4 as proportional integration computing module 41, for defeated
Enter reference voltage Vref；One end of 5th resistance R5 is connected with the positive input terminal of the first operational amplifier 412；5th resistance R5's
First input end of the other end as proportional integration computing module 41, for inputting predeterminated voltage；One end of 6th resistance R6 with
The positive input terminal of first operational amplifier 412 is connected；The other end of 6th resistance R6 is grounded.
It should be noted that the connection and distribution mode of a kind of resistor network are merely provided in the present embodiment, but this
The specific structure and each resistance for not limiting the resistor network in the proportional integration computing module in embodiment, as long as energy
Enough realize accurate PI operation.
Flow module is examined in the embodiment of the present invention to be used to electric current output being converted into voltage output, and carries out current detecting, this
The specific structure of the inspection flow module is not limited in inventive embodiments, optionally, as shown in Figure 4.Examining flow module includes: amplifier
442 and four line examine leakage resistance 441；It includes the first terminals, the second terminals, the first output end and that four lines, which examine leakage resistance 441,
Two output ends；Wherein, the first terminals of four lines inspection leakage resistance 441 are connected with load 43；Second terminals ground connection；First output
End is connected with the positive input terminal of amplifier 442；Second output terminal is connected with the negative input end of amplifier 442；Amplifier 442 it is defeated
Outlet is connected as the voltage output end of inspection flow module with the third input terminal of proportional integration computing module 41；Amplifier 442 with
Power supply circuit is connected.
It should be noted that four lines inspection leakage resistance used in inspection flow module is that four lines of low resistance Low Drift Temperature examine galvanic electricity
Current signal is converted to voltage signal by the four lines inspection leakage resistance of resistance, low resistance Low Drift Temperature, and low resistance guarantees to make under high current
Obtaining power is that four lines are examined in leakage resistance tolerance interval.The output end of amplifier and proportional integration computing module in the present embodiment
Third input terminal is connected.Amplifier is used to amplify the voltage signal after the inspection leakage resistance conversion of four lines and feeds back to proportional integration fortune
Module is calculated, to improve the operational precision of proportional integration computing module.
The specific structure of amplifier is not limited in the present embodiment, optionally, amplifier can be instrument amplifier, can also be with
To examine stream amplifier.It should be noted that the noise due to instrument amplifier is low, while amplifying voltage signal, noise is introduced
It is smaller, and there is very high common-mode rejection ratio, for feeding back precision when PI operation can improve output signal, therefore,
Optional in the present embodiment, the amplifier is instrument amplifier.
As shown in figure 4, load 43 is located at the first wiring of the output end and inspection flow module of the first power operational amplifier 42
Between end, the second terminals ground connection of flow module is examined, i.e. inspection flow module is located at the rear end loaded.
In other embodiments of the invention, load may be located between inspection flow module and ground, namely inspection flow module position
In the front end of load.
When the amplifier is inspection stream amplifier, as shown in figure 5, bipolar current source relative to Fig. 4, other portions
Split-phase is same, is not described in detail in the present embodiment.Unlike bipolar current source shown in Fig. 4, in Fig. 5, four lines examine galvanic electricity
Resistance 441 includes the first terminals, the second terminals, the first output end and second output terminal；Wherein, the first terminals and the first function
The output end of rate operational amplifier 42 is connected；Second terminals are connected with one end of load 43；The other end ground connection of load 43；The
One output end is connected with the positive input terminal of inspection stream amplifier 542；The negative input end phase of second output terminal and inspection stream amplifier 542
Even；The output end of inspection stream amplifier 542 is connected as voltage output end with the third input terminal of proportional integration computing module 41；Inspection
Stream amplifier 542 is connected with power supply circuit.
When instrument amplifier is placed on loading nose, as shown in fig. 6, four lines inspection leakage resistance 441 includes the first terminals, the
Two terminals, the first output end and second output terminal；Wherein, the output end of the first terminals and the first power operational amplifier 42
It is connected；Second terminals are connected with one end of load 43；The other end ground connection of load 43；First output end and instrument amplifier
642 positive input terminal is connected；Second output terminal is connected with the negative input end of instrument amplifier 642；The output of instrument amplifier 642
End is connected as voltage output end with the third input terminal of proportional integration computing module 41；Instrument amplifier 642 and power supply circuit
It is connected.It should be noted that bipolar current source further includes pressure limiting module (D1 because instrument amplifier common-mode voltage range is small
With shown in D2)；Specifically, as shown in fig. 6, pressure limiting module includes the first zener diode D1 and the second zener diode D2；The
The cathode of one zener diode D1 is connected with the positive input terminal of the first power operational amplifier 42；First zener diode D1 is just
Pole is connected with the anode of the second zener diode D2；The cathode of second zener diode D2 is grounded.
In addition, can also include current surveillance function in the present embodiment, as shown in Fig. 4, Fig. 5 and Fig. 6, in amplifier
Output end further includes an operational amplifier 45, and output end is connected on corresponding display instrument for detecting electric current, right
The electric current detected is shown, to facilitate user to check.Likewise, operational amplifier 45 is also connected with power supply circuit.
It includes amplifier and four lines inspection leakage resistance that flow module is examined in the embodiment of the present invention, can be to passing through by inspection flow module
The electric current of load is detected, and converts electrical current into voltage, is fed back to the third input terminal of proportional integration computing module, is used for
Improve the precision of proportional integration operation.
The other embodiment of the present invention also provides a kind of bipolar current source, inspection flow module can also with Hall sensor and
Sampling resistor replaces, as shown in fig. 7, inspection flow module includes: suddenly unlike the bipolar current source provided from above example
That sensor 74 and the 8th resistance R8, the 8th resistance R8 are sampling resistor；Hall sensor 74 connects including the first terminals, second
Line end and voltage output end；First terminals of Hall sensor 74 are connected with load 73；Second terminals ground connection；Hall sensing
The voltage output end of device 74 is connected with one end of sampling resistor R8, and the third input terminal phase with proportional integration computing module 71
Even；The other end of sampling resistor R8 is grounded.
Since Hall sensor carries out inspection stream by the magnetic flux that the generation of Hall sensor electric current is flowed through in detection, without common mode
Voltage is added on Hall sensor, and therefore, the front end that Hall sensor can also be placed on load uses, as shown in figure 8, of the invention
Hall sensor 84 includes the first terminals, the second terminals and voltage output end in embodiment；First power operational amplifier
72 output end is connected with the first terminals of Hall sensor 84；Second terminals of Hall sensor 84 and the one of load 73
End is connected；The other end ground connection of load 73；The voltage output end of Hall sensor 84 is connected with one end of sampling resistor R8；Sampling
The other end of resistance R8 is grounded；The third input terminal phase of the voltage output end of Hall sensor 84 and proportional integration computing module 71
Even；Power supply circuit is respectively connected with the first operational amplifier, the first power operational amplifier 72 and Hall sensor 84.
It should be noted that the connection type of Hall sensor can there are many, e.g., some Hall sensors detects electric current
It is to be connected to electric current on its both ends；There is a hole among some Hall sensors, conducting wire is right in the present embodiment directly through the hole
The specific connection type of Hall sensor is without limitation.
In the present embodiment, the front end that Hall sensor is placed on load can be realized the parallel connection of interchannel.
Below by the application in experiment the present invention will be described in detail embodiment, bipolar current source shown in Figure 4,
In the present embodiment, the value of R1, R2 are 2k Ω, and the value of R3, R6 are 1k Ω, and R4 value is 4k Ω, and R5 value is 1.5k Ω, R7
Adjustable range be 500k ohm, the value of C1 is 22nF.It is 20m Ω, instrument amplifier AD8429 that four lines, which examine leakage resistance value,
Gain is set as 10, and gain setting resistor is 665 Ω, it should be noted that if inspection flow module is using Hall sensor and sampling electricity
It hinders R8 to constitute, then the representative value of sampling resistor R8 is in 10 Ω or so.
The first operational amplifier in the embodiment of the present invention in PI computing module uses the operational amplifier of AD8597 model
PI operation is carried out, the first power operational amplifier uses the power operational amplifier of OPA549 model.Leakage resistance is examined to use
CSM3637Z model, inspection stream amplifier use instrument amplifier AD8429.Also high-precision hall sensor can be used to be examined
Stream.Internal reference voltage and bias voltage+10V are provided using REF102, -10V by the INA105 that is used cooperatively with REF102 Lai
It provides.Power supply circuit uses low noise LDO.
It is arranged by above-mentioned resistance, realizes the corresponding -10A~+10A electric current of input -4V~+4V voltage.Change the electricity of 350uH
1A electric current was only needed less than the 25us time in sense, and therefore, bipolar current source provided in an embodiment of the present invention can work as fast electric
Stream switch uses, no ring.The RMS current noise of 3Hz~10kHz is less than 4uA.
The present invention proposes a several amperes of high-precision low noise acoustic modes for the application background of cold atom experiment magnetic field control
Quasi- control bipolar current source, the four-quadrant current source that the bipolar current source output voltage and electric current can just born, and
Driving capability is strong, and it is even higher that output current peak can reach 10A.Using the design of low noise, precision is high, and has very strong
Inductance driving capability, fast response time, can when fast current switch use, no ring.The design structure is simple, no dead zone
Voltage, and have preferable power supply rejection ability.The invention is able to achieve magnetic field control accurate in cold atom experiment, such as Three-Dimensional Magnetic
Field compensation etc..
It (is used it should be noted that output peak point current can be made to reach several amperes using power operational amplifier
OPA549 can arrive 10A), by the cascade of power operational amplifier, output electric current can achieve higher.As shown in figure 9, being this hair
The structural schematic diagram for the bipolar current source that bright another embodiment provides, unlike bipolar current source before, this reality
Apply in example further includes the second power operational amplifier 922, the 9th resistance R9 and the tenth resistance R10；Wherein, the 9th resistance R9 connects
Between the output end and load 93 of the first power operational amplifier 921；The output end of first power operational amplifier 921 and
The positive input terminal of two power operational amplifiers 922 is connected；The negative input end of second power operational amplifier 922 is put with the second power
The output end of big device 922 is connected, and is connected with one end of the tenth resistance R10；The other end of tenth resistance R10 and 93 phases of load
Even；Second power operational amplifier 922 is connected with power supply circuit.
The description of other parts may refer to the description in above example, not repeat them here in the present embodiment to this.At this
In invention other embodiments, when inspection flow module is located at loading nose, the 9th resistance is connected on the first power operational amplifier
Between output end and inspection flow module, for details, reference can be made to above example, this is not described in detail in the present embodiment.
By one power operational amplifier of cascade in the present embodiment, the increase of output electric current is realized, of the invention
In other embodiments, more power operational amplifiers, this implementation can also be cascaded according to the size requirements of actual output current
It is not limited this in example.
In conclusion bipolar current source provided by the invention has the advantages that
A) two-stage calculation amplifier structure is used, previous stage precision operational-amplifier completes PI operation and reduces noise, latter
Grade power operational amplifier completes electric current output.Power dissipation is on power operational amplifier when High-current output, temperature meeting
Variation, effectively reduces temperature drift using previous stage operational amplifier operation.Two-level configuration makes current driving ability reach several peaces
Extremely low noise is still ensured that when training；
B) double-polarity control of electric current is realized using power operational amplifier, what output voltage and electric current can just born
Four-quadrant has better common mode inhibition, the characteristics such as power supply inhibition, and Power arithmetic compared to the push-and-pull grade of a pair of of BJT pipe composition
Amplifier integrated chip carries overheat protector, and the functions such as maximum current limitation are convenient and practical.Power operational amplifier can make to export
Peak point current reaches several amperes (OPA549 used can arrive 10A), and by the cascade of power operational amplifier, exporting electric current can be with
Reach higher；
C) bandwidth of a device selected by is big, and feedback response speed is fast, has the current source using power operational amplifier very strong
Inductance driving capability, fast response time can use, no ring when fast current switch；
D) noise for reducing inspection stream end greatly is banished using instrument amplifier inspection, improves the precision of PI operation；
E) two kinds of input modes inside and out having are easy to use；
F) it is arranged by wire jumper, compatible positive negative level and positive level input both of which；
G) it can be protected by the replacement of the current limitation resistor of power operational amplifier OPA549 with limiting circuit maximum current
Protection circuit and load are not burnt out because of overcurrent；
H) by the gain setting resistor of instrument amplifier, gain is easily changed, changes input voltage and produced electricity
The proportionate relationship of stream；
I) PI parameter is arranged by slide rheostat and facilitates adjusting, can be adapted for the load of different induction；
J) circuit cost is low, is easy to Mass production；
K) it can be realized the high-accuracy control in magnetic field in cold atom experiment, low noise magnetic field, and magnetic can be generated by required waveform
Field size can change quickly, and magnetic direction can also change.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of bipolar current source characterized by comprising
Proportional integration computing module, the first power operational amplifier, load, inspection flow module, first resistor, second resistance and power supply
Circuit, the second power operational amplifier, the 9th resistance and the tenth resistance；
The proportional integration computing module includes resistor network, the first operational amplifier and integrating capacitor；The proportional integration fortune
Calculating module includes first input end, the second input terminal, third input terminal and output end, the output end of first operational amplifier
It is connected with one end of the integrating capacitor, the output end as the proportional integration computing module；The first input end is used for
Predeterminated voltage is inputted, second input terminal is used for input reference voltage, and the third input terminal is for receiving feedback electric signal；
The positive input terminal of first power operational amplifier is connected with the output end of the proportional integration computing module；
The output end of first power operational amplifier is connected with one end of the first resistor；
The other end of the first resistor is connected with one end of the second resistance；
The common end of the first resistor and the second resistance is connected with the negative input end of first power operational amplifier；
The other end of the second resistance is grounded；
The inspection flow module includes the first terminals, the second terminals and voltage output end；
The load is located between the first terminals of the inspection flow module and the output end of first power operational amplifier,
The second terminals ground connection of the inspection flow module, the 9th resistance are connected on the output end of first power operational amplifier
Between the load；
The output end of first power operational amplifier is connected with the positive input terminal of second power operational amplifier；
The negative input end of second power operational amplifier is connected with the output end of second power amplifier, and with it is described
One end of tenth resistance is connected；
The other end of tenth resistance is connected with the common end of the load and the 9th resistance；
Second power operational amplifier is connected with the power supply circuit；
Or, the load is located between the second terminals and ground of the inspection flow module, the first terminals of the inspection flow module
It is connected with the output end of first power operational amplifier, the 9th resistance is connected on first power operational amplifier
Output end and the inspection flow module between；
The output end of first power operational amplifier is connected with the positive input terminal of second power operational amplifier；
The negative input end of second power operational amplifier is connected with the output end of second power amplifier, and with it is described
One end of tenth resistance is connected；
The other end of tenth resistance is connected with the inspection flow module；
Second power operational amplifier is connected with the power supply circuit；
The inspection flow module is used to detect the electric current Jing Guo the load, the voltage output end and the proportional integration operation mould
The third input terminal of block is connected；
The power supply circuit and first operational amplifier, first power operational amplifier and the inspection flow module are distinguished
It is connected.
2. bipolar current source according to claim 1, which is characterized in that the resistor network includes 3rd resistor,
Four resistance, the 5th resistance, the 6th resistance and the 7th resistance；
Wherein, the negative input end of one end of the 3rd resistor and first operational amplifier and the 7th resistance
One end is connected, and the other end of the ratio capacitor is connected with the other end of the 7th resistance；
The third input terminal of the other end of the 3rd resistor as the proportional integration computing module, for receiving feedback
Electric signal；
One end of 4th resistance is connected with the negative input end of first operational amplifier；
Second input terminal of the other end of 4th resistance as the proportional integration computing module, for inputting reference
Voltage；
One end of 5th resistance is connected with the positive input terminal of first operational amplifier；
The first input end of the other end of 5th resistance as the proportional integration computing module, it is default for inputting
Voltage；
One end of 6th resistance is connected with the positive input terminal of first operational amplifier；
The other end of 6th resistance is grounded.
3. bipolar current source according to claim 2, which is characterized in that
The output end of first power operational amplifier is connected with one end of the load；
The other end of the load is connected with first terminals；
The second terminals ground connection；
The output end of the inspection flow module is connected with the third input terminal of the proportional integration computing module.
4. bipolar current source according to claim 3, which is characterized in that the inspection flow module includes amplifier and four lines
Examine leakage resistance；The amplifier is inspection stream amplifier or instrument amplifier；
The four lines inspection leakage resistance includes first terminals, second terminals, the first output end and second output terminal；
Wherein, first terminals are connected with the load；
The second terminals ground connection；
First output end is connected with the positive input terminal of the amplifier；
The second output terminal is connected with the negative input end of the amplifier；
Third input terminal phase of the output end of the amplifier as the voltage output end and the proportional integration computing module
Even；
The amplifier is connected with the power supply circuit.
5. bipolar current source according to claim 3, which is characterized in that the inspection flow module include Hall sensor and
Sampling resistor；
The Hall sensor includes first terminals, second terminals and the voltage output end；
First terminals are connected with the load；
The second terminals ground connection；
The voltage output end is connected with one end of the sampling resistor, and inputs with the third of the proportional integration computing module
End is connected；
The other end of the sampling resistor is grounded；
The Hall sensor is connected with the power supply circuit.
6. bipolar current source according to claim 2, which is characterized in that
The output end of first power operational amplifier is connected with first terminals；
Second terminals are connected with one end of the load；
The other end of the load is grounded；
The voltage output end is connected with the third input terminal of the proportional integration computing module.
7. bipolar current source according to claim 6, which is characterized in that the inspection flow module include Hall sensor and
Sampling resistor；
The Hall sensor includes first terminals, second terminals and the voltage output end；
The output end of first power operational amplifier is connected with first terminals；
Second terminals are connected with one end of the load；
The other end of the load is grounded；
The voltage output end is connected with one end of the sampling resistor, and inputs with the third of the proportional integration computing module
End is connected；
The other end of the sampling resistor is grounded；
The Hall sensor is connected with the power supply circuit.
8. bipolar current source according to claim 6, which is characterized in that the inspection flow module include inspection stream amplifier and
Four lines examine leakage resistance；
The four lines inspection leakage resistance includes first terminals, second terminals, the first output end and second output terminal；
Wherein, first terminals are connected with the output end of first power operational amplifier；
Second terminals are connected with one end of the load；
The other end of the load is grounded；
First output end is connected with the positive input terminal of the inspection stream amplifier；
The second output terminal is connected with the negative input end of the inspection stream amplifier；
The output end of the inspection stream amplifier is inputted as the third of the voltage output end and the proportional integration computing module
End is connected；
The inspection stream amplifier is connected with the power supply circuit.
9. bipolar current source according to claim 6, which is characterized in that the inspection flow module include instrument amplifier and
Four lines examine leakage resistance；The bipolar current source further includes pressure limiting module；
The four lines inspection leakage resistance includes first terminals, second terminals, the first output end and second output terminal；
Wherein, first terminals are connected with the output end of first power operational amplifier；
Second terminals are connected with one end of the load；
The other end of the load is grounded；
First output end is connected with the positive input terminal of the instrument amplifier；
The second output terminal is connected with the negative input end of the instrument amplifier；
The output end of the instrument amplifier is inputted as the third of the voltage output end and the proportional integration computing module
End is connected；
The instrument amplifier is connected with the power supply circuit；
The pressure limiting module includes the first zener diode and the second zener diode；
The cathode of first zener diode is connected with the positive input terminal of first power operational amplifier；
The anode of first zener diode is connected with the anode of second zener diode；
The cathode of second zener diode is grounded.
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| CN108761284B (en) * | 2018-05-18 | 2024-07-05 | 北京华峰测控技术股份有限公司 | Drain leakage current test circuit and method in field effect transistor breakdown voltage characteristics |
| CN109116903B (en) * | 2018-08-17 | 2021-02-09 | 北京控制工程研究所 | Bipolar high-precision constant-current driving system and method suitable for inductive load |
| CN109068240B (en) * | 2018-08-27 | 2024-02-23 | 上海艾为电子技术股份有限公司 | Digital audio power amplifier system |
| CN109669066A (en) * | 2019-01-25 | 2019-04-23 | 深圳市京泉华智能电气有限公司 | Current detecting comparison circuit |
| CN110658369A (en) * | 2019-09-24 | 2020-01-07 | 深圳供电局有限公司 | Residual current simulation generation device and residual current action protection system |
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