CN103091532A - Electric current transducer used for automobile and based on zero magnetic flux compensation - Google Patents
Electric current transducer used for automobile and based on zero magnetic flux compensation Download PDFInfo
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- CN103091532A CN103091532A CN2011103349044A CN201110334904A CN103091532A CN 103091532 A CN103091532 A CN 103091532A CN 2011103349044 A CN2011103349044 A CN 2011103349044A CN 201110334904 A CN201110334904 A CN 201110334904A CN 103091532 A CN103091532 A CN 103091532A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to an electric current measurement technology, in particular to an electric current transducer suitable for measuring an output current of an automobile alternating-current generator in a mutual inductance mode, a double-storage-battery automobile power supply system including the electric current transducer, and a hybrid electric automobile adopting the double-storage-battery automobile power supply system. The electric current transducer used for an automobile and based on zero magnetic flux compensation comprises a magnetic core wound by an output wire of the automobile alternating-current generator, a secondary winding wound on the magnetic core, a detection winding wound on the magnetic core and a magnetic flux compensation device coupled between the secondary winding and the detection winding, wherein the magnetic flux compensation device supplies compensating current for the secondary winding according to potential difference between two ends of the detection winding, and the potential difference is enabled to tend to zero. According to the electric current transducer used for the automobile and based on the zero magnetic flux compensation, due to the fact that an auxiliary magnetic core and a compensating winding are saved, microminiaturization of the transducer is facilitated.
Description
Technical field
The present invention relates to current measurement techniques, particularly a kind of current sensor with mutual inductance mode measured automobiles alternator output current, the two storage battery car electric power systems that comprise this current sensor and hybrid vehicle that adopts this pair storage battery car electric power system of being applicable to.
Background technology
Alternator is that electric energy indispensable in general-utility car and hybrid vehicle produces equipment.Can work reliably for the electrical system that makes automobile, the output of alternator, the capacity of accumulator, electricity needs and other electrical load of starter are reasonably mated each other.For this reason, the output current of Measurement accuracy alternator is one of them key element.Although can determine the output power of generator according to the rotating speed of engine, this indirect mode is insecure in some cases, therefore in order to improve the redundancy of system, preferably the equipment of electric current is directly measured in configuration in automobile.
Multiple electric current detecting method is arranged, and wherein utilizing current transformer is a kind of technology commonly used.Therefore AC current transformer generally comprises iron core and two windings, if disregard exciting curent, the magnetomotive force of former secondary equates, can determine electric current by former limit by the electric current of measuring secondary.But this ideal situation can't be realized in actual applications, will cause measuring error thus.
For this reason, industry has proposed the current sensor based on zero magnetic flux principle.Fig. 1 shows the schematic diagram based on the current sensor of electronic compensation zero magnetic flux.In Fig. 1, T1 and T2 are respectively work magnetic core and auxiliary magnetic core, than common current transformer, have set up detection winding N
0With compensation winding N
3, wherein, detect winding N
0Detect the magnetic flux density in T1, with dynamic tracking exciting curent I
0Variation, thereby provide feedback signal for Single Chip Microcomputer (SCM) system 100.Subsequently, the offset current I of Single Chip Microcomputer (SCM) system 100 outputs
3By compensation winding N
3Produce excitatory electromotive force, make I
0Be reduced to very littlely, reach the effect of zero magnetic flux.
In current sensor shown in Figure 1, auxiliary magnetic core T2 and detection winding N
0With compensation winding N
3Set up the expansion that takes up room that will make sensor, this is disadvantageous for the application on automobile.In addition, electric circumstance and working environment near alternator are very complicated, and the increase of component number also will weaken antijamming capability.
Summary of the invention
An object of the present invention is to provide a kind of current sensor, it has advantages of that precision is high, volume is little, is suitable for the output current of measured automobiles alternator.
Above-mentioned purpose can be realized by following technical proposals.
A kind of current sensor based on zero flux compensation for automobile comprises:
Magnetic core, the output lead of the alternator of described automobile are suitable for being wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to the described Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
Preferably, in above-mentioned current sensor, described magnetic flux compensation system comprises:
The detection of dynamic unit, it carries out quick sampling to described electric potential difference;
The offset current setup unit, its electric potential difference signal according to sampling is determined size and the phase place of described offset current; And
Current output unit, its compensation current of determining according to described offset current setup unit produces corresponding offset current.
Preferably, in above-mentioned current sensor, described current output unit comprises:
Phase-shift circuit, it is adjusted electromotive force extent and phase place from described detection winding accordingly according to the compensation current that described offset current setup unit is determined; And
Voltage/current conversion circuit, the voltage signal after it will be adjusted is converted to offset current and offers described Secondary Winding.
Preferably, in above-mentioned current sensor, described current output unit comprises:
Phase-shift circuit, it is adjusted electromotive force extent and phase place from described detection winding accordingly according to the compensation current that described offset current setup unit is determined;
Voltage/current conversion circuit, the voltage signal after it will be adjusted is converted to offset current; And
Be coupling in the bandwidth-limited circuit between described voltage/current conversion circuit and described Secondary Winding, its offset current to described voltage/current conversion circuit output carries out filtering and exports filtered signal to described Secondary Winding.
Preferably, in above-mentioned current sensor, described phase-shift circuit is multiterminal feedback second-order circuit, and the transfer function H of this circuit is:
Here, k, a and b are constant, ω
0Be circuit resonant frequencies.
Preferably, in above-mentioned current sensor, described multiterminal feedback second-order circuit comprises operational amplifier, described electric potential difference is through the inverting input of the first resistor and the described operational amplifier of the first capacitor input, and through the normal phase input end of the 3rd described operational amplifier of resistor input, the output terminal of described operational amplifier accesses described inverting input through the second resistor, and is connected between described the first resistor and described the first capacitor through the second capacitor.
Preferably, in above-mentioned current sensor, the differential difference second order filter of described bandpass filtering unit employing multi-mode is realized.
Preferably, in above-mentioned current sensor, the centre frequency of described bandpass filtering unit is corresponding to the frequency of the current output of described alternator, and passband is 10-15Hz.
Preferably, in above-mentioned current sensor, the frequency f of the current output of described alternator is determined according to following formula:
f＝pn/60
Here, p is the quantity of the pole pair of described alternator, and n is the current rotating speed of described alternator, can determine according to the rotating speed of the engine of described automobile.
Another object of the present invention is to provide a kind of pair of storage battery car electric power system, and it utilizes above-mentioned current sensor, has realized the accurate control to energy flow.
Above-mentioned purpose can be realized by following technical proposals.
A kind of pair of storage battery car electric power system comprises:
Alternator;
The first accumulator, itself and described alternator parallel coupled are to form current supply circuit;
The second accumulator, itself and starter parallel coupled start the loop to form; And
Control module, it controllably is coupling between described current supply circuit and described startup loop and dc-dc conversion is provided, and comprises current sensor, and this current sensor comprises:
Magnetic core, the output lead of described alternator are wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to the described Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
Preferably, in above-mentioned pair of storage battery car electric power system, described control module is implemented the charging of dc-dc conversion between operating to realize both to the output of the described first or second accumulator, and dc-dc conversion is implemented in the output of described alternator is operated to realize that described alternator is to the charging of described the second accumulator.
Another object of the present invention is to provide a kind of hybrid vehicle, and it utilizes above-mentioned current sensor, has realized the accurate control to energy flow.
Above-mentioned purpose can be realized by following technical proposals.
A kind of hybrid vehicle comprises:
Electric battery;
Inverter;
Engine;
By described engine-driven alternator;
Drive the motor of running car, it is through described inverter and described electric battery and alternator coupling;
Energy management unit is in charge of the energy flow between described electric battery, inverter, engine, alternator and motor, comprises current sensor, and this current sensor comprises:
Magnetic core, the output lead of described alternator are wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to the described Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
According to embodiments of the invention, owing to having saved auxiliary magnetic core and compensation winding, therefore be conducive to realize the microminiaturization of sensor.In addition, have phase-shift circuit and the filtering circuit of the transport function of particular design by employing, can compensate quickly and accurately exciting curent, thereby realize the effect of zero magnetic flux.
From following detailed description by reference to the accompanying drawings, will make above and other objects of the present invention and advantage more fully clear.
Description of drawings
Fig. 1 shows the schematic diagram based on the current sensor of electronic compensation zero magnetic flux.
Fig. 2 is the schematic diagram according to the current sensor of one embodiment of the invention.
Fig. 3 is the block diagram according to the magnetic flux compensation system in the current sensor shown in Figure 2 of one embodiment of the invention.
Fig. 4 is the circuit diagram according to the current output unit in the magnetic flux compensation system shown in Figure 3 of one embodiment of the invention.
Fig. 5 is that it adopts the current sensor according to the embodiment of the present invention according to the schematic diagram of two storage battery car electric power systems of one embodiment of the invention.
Fig. 6 is the schematic diagram according to the hybrid vehicle of one embodiment of the invention, and it adopts the current sensor according to the embodiment of the present invention.
Embodiment
Below by being described with reference to the drawings, the specific embodiment of the present invention sets forth the present invention.But it will be appreciated that, these embodiments are only exemplary, there is no restriction for spirit of the present invention and protection domain.
In this manual, " coupling " word should be understood to be included in the situation that directly transmits energy or signal between two unit, perhaps indirectly transmit the situation of energy or signal through one or more Unit the 3rd, and alleged signal includes but not limited to the signal that the form with electricity, light and magnetic exists here.In addition, " comprise " and the term of " comprising " and so on represent except have have in instructions and claims directly and the unit and step of clearly statement, technical scheme of the present invention is not got rid of yet and is had not by directly or other unit of clearly explaining and the situation of step.Moreover the term such as " first ", " second ", " the 3rd " and " the 4th " does not represent that unit or numerical value are only to be used as to distinguish each unit or numerical value in the order of the aspects such as time, space, size.
Fig. 2 is the schematic diagram according to the current sensor of one embodiment of the invention.
Referring to Fig. 2, this current sensor 20 comprises magnetic core T, is wound in the Secondary Winding N on magnetic core T
2With detection winding N
D, be coupling in Secondary Winding N
2With detection winding N
DBetween magnetic flux compensation system 210 and the measuring unit 220 in access Secondary Winding loop.
For current sensor 20, its winding is the output lead of AC generator for vehicle, owing to only having a circle, therefore belongs to " pine " coupled structure, and is larger at the less time error of primary current.But consider that the electric current in output lead is at least several peaces doubly, therefore with current sensor application shown in Figure 2 when the alternator, this error can't consist of problem.
In current sensor shown in Figure 2 20, magnetic flux compensation system 210 can be considered as an active network that produces secondary current, and the magnetic potential balance equation in Secondary Winding loop is:
I
1n
1+I
2n
2+I
3n
2＝-I
0n
1 (1)
Here, I
1And I
2Be the electric current of primary circuit and secondary circuit, I
3For magnetic flux compensation system 210 to Secondary Winding N
2The offset current that provides, I
0Be exciting curent, n
1And n
2Be respectively the number of turn of winding and Secondary Winding.According to embodiments of the invention, magnetic flux compensation system 210 is controlled to Secondary Winding N
2Offset current I
3Mode be to make to detect winding N
DThe electric potential difference at two ends goes to zero, and the magnetic flux in magnetic core is approximately zero magnetic flux at this moment, therefore has following relationship:
I
1n
1+I
2n
2＝0 (2)
Fig. 3 is the block diagram according to the magnetic flux compensation system in the current sensor shown in Figure 2 of one embodiment of the invention.
Referring to Fig. 3, magnetic flux compensation system 210 comprises detection of dynamic unit 211, offset current setup unit 212 and current output unit 213.
Detection of dynamic unit 211 can be a high-speed a/d converter, and it is to detecting winding N
DThe electric potential difference u at two ends
iCarry out quick sampling.Offset current setup unit 212 is determined offset current I according to sampled signal
3Size and phase place.Particularly, offset current setup unit 212 given first setting compensation electric current I
3Initial value, then constantly determine offset current I according to the variable quantity of sampled signal
3Adjusted value.Determined adjusted value is output to current output unit 213, produces corresponding offset current I by it
3
Fig. 4 is the circuit diagram according to the current output unit in the magnetic flux compensation system shown in Figure 3 of one embodiment of the invention.
Referring to Fig. 4, current output unit 213 comprises phase-shift circuit 2131 and voltage/current conversion circuit 2132.The adjusted value that phase-shift circuit 2131 is determined according to offset current setup unit 212 is to from detecting winding N
DElectric potential difference u
iSize and phase place adjust accordingly, the voltage signal switching current signal after voltage/current conversion circuit 2132 will be adjusted (is also offset current I
3) and offer Secondary Winding N
2
In order to realize the current measurement of low cost, high reliability, the present inventor proposes the multiterminal feedback second-order circuit of structure shown in Figure 4 and realizes phase-shift circuit.This circuit comprises operational amplifier A 1, electric potential difference u
iInput to the inverting input of operational amplifier A 1 through the first variohm R1 and the first variable condenser C1, and through the normal phase input end of the 3rd resistor R3 input operational amplifier A1.On the other hand, the output terminal of operational amplifier A 1 accesses inverting input through the second resistor R2, and is connected between the first variohm R1 and the first variable condenser C1 through the second capacitor C2.
The transfer function H of above-mentioned multiterminal feedback second-order circuit is:
Here, k, a and b are constant, ω
0Be circuit resonant frequencies.
Fig. 4 also shows the circuit structure of voltage/current conversion circuit 2132.As shown in Figure 4, voltage/current conversion circuit 2132 comprises operational amplifier A 2, the voltage signal u after processing through phase shift
2And the normal phase input end of input operational amplifier A2, offset current I
3Through output terminal input Secondary Winding N
2The loop, wherein:
I
3＝gU
2 (4)
Here g is mutual conductance, by the resistance of regulating resistor R5, can change the value of g.
Alternatively, can increase a bandwidth-limited circuit after voltage/current conversion circuit 2132, with the unwanted current component of filtering, thereby further improve measuring accuracy.
This bandwidth-limited circuit for example can adopt the form of the differential difference second order filter of multi-mode to realize, its centre frequency is corresponding to the frequency of the current output of AC generator for vehicle, and passband is 10-15Hz.For AC generator for vehicle, the frequency f of its current output can be determined according to following formula:
f＝pn/60 (5)
Here, p is the quantity of the pole pair of alternator, and n is the current rotating speed of alternator, can determine according to the rotating speed of the engine of described automobile.
Fig. 5 is that it adopts the current sensor according to the embodiment of the present invention according to the schematic diagram of two storage battery car electric power systems of one embodiment of the invention.
Referring to Fig. 5, this pair storage battery car electric power system 50 comprises control module 510, alternator 520, the first and second accumulator 530A and 530B and first-Di, four switchgear K1-K4.In Fig. 6, heavy line represents power or energy flow, and fine line represents control signal and measuring-signal stream.It is worthy of note, although here control module 510 is connected with bus mode with first-Di, four switchgear K1-K4 and generator 520, but this and do not mean that control module and controlled unit between must be confined to this connected mode, in fact also can adopt point-to-point connected mode between them.
in Fig. 5, control module 510 is cores of whole electric power system 50, it is responsible on the one hand according to electricity consumption situation (for example using the need for electricity of electric loading 30 and 40), battery condition (is for example the working current of the first and second accumulator 530A and 530B here, operating voltage, temperature, one or more in degree of aging and state-of-charge (SOC)) and generator state (such as the current working current that can provide of alternator 520) etc. determine suitable electric energy management strategy, on the other hand, control module 510 also has the DC-to-dc transfer capability, to provide suitable charging voltage with reduced pressure operation to the first and second accumulator 530A and 530B by boosting.In order to measure exactly alternator 520, in the present embodiment, control module 510 comprises top by the described current sensor in Fig. 2-5.
Fig. 6 is the schematic diagram according to the hybrid vehicle of one embodiment of the invention, and it adopts the current sensor according to the embodiment of the present invention.
Referring to Fig. 6, this hybrid vehicle 60 comprises electric battery 610, inverter 620, engine 630, the alternator 640 that is driven by engine 630, motor 650 and the energy management unit 660 that drives running car, heavy line represents the path of energy flow, and fine line represents the flow path of control signal/detection signal.In hybrid vehicle shown in Figure 6, motor 650 is through inverter 620 and electric battery 610 and alternator 640 couplings, under the management of energy management unit 660, energy flow flows between electric battery 610, inverter 620, engine 630, alternator 640 and motor 650.For example, under the control of energy management unit 660, engine 630 drives alternator 640 generatings, and electric energy is transported to electric battery 610 or motor 650 by inverter 620, drives running car by motor 650 by gear.Particularly, for little load condition, can drive wheel by electric battery 610 drive motor 650, and for large load condition, by engine 630 band motor alternator 640 generating drive motor 650.When vehicle was in startup, acceleration, climbing operating mode condition, generator 640 and electric battery 610 provided electric energy to motor 650 jointly; When automobile is in low speed, slides, during the operating mode of idling, by electric battery 610 drive motor 650, when electric battery 610 short of electricity by engine-generator set to electric battery 610 chargings.In the present embodiment, energy management unit 660 is with bus mode and other unit communication, and above comprising by the described current sensor in Fig. 2-5 to realize the Measurement accuracy to the working current of alternator 640.
Due to can be under the spirit that does not deviate from essential characteristic of the present invention, implement the present invention with various forms, therefore present embodiment is illustrative and not restrictive, because scope of the present invention is defined by claims, rather than defined by instructions, therefore fall into the border of claim and all changes in boundary, or the equivalent of this claim border and boundary thereby forgiven by claim.
Claims (12)
1. the current sensor based on zero flux compensation that is used for automobile, is characterized in that, comprising:
Magnetic core, the output lead of the alternator of described automobile are suitable for being wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to the described Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
2. current sensor as claimed in claim 1, wherein, described magnetic flux compensation system comprises:
The detection of dynamic unit, it carries out quick sampling to described electric potential difference;
The offset current setup unit, its electric potential difference signal according to sampling is determined size and the phase place of described offset current; And
Current output unit, its compensation current of determining according to described offset current setup unit produces corresponding offset current.
3. current sensor as claimed in claim 2, wherein, described current output unit comprises:
Phase-shift circuit, it is adjusted electromotive force extent and phase place from described detection winding accordingly according to the compensation current that described offset current setup unit is determined; And
Voltage/current conversion circuit, the voltage signal after it will be adjusted is converted to offset current and offers described Secondary Winding.
4. current sensor as claimed in claim 2, wherein, described current output unit comprises:
Phase-shift circuit, it is adjusted electromotive force extent and phase place from described detection winding accordingly according to the compensation current that described offset current setup unit is determined;
Voltage/current conversion circuit, the voltage signal after it will be adjusted is converted to offset current; And
Be coupling in the bandwidth-limited circuit between described voltage/current conversion circuit and described Secondary Winding, its offset current to described voltage/current conversion circuit output carries out filtering and exports filtered signal to described Secondary Winding.
5. current sensor as claimed in claim 2, wherein, described phase-shift circuit is multiterminal feedback second-order circuit, the transfer function H of this circuit is:
Here, k, a and b are constant, ω
0Be circuit resonant frequencies.
6. current sensor as claimed in claim 5, wherein, described multiterminal feedback second-order circuit comprises operational amplifier, described electric potential difference is through the inverting input of the first resistor and the described operational amplifier of the first capacitor input, and through the normal phase input end of the 3rd described operational amplifier of resistor input, the output terminal of described operational amplifier accesses described inverting input through the second resistor, and is connected between described the first resistor and described the first capacitor through the second capacitor.
7. current sensor as claimed in claim 4, wherein, described bandpass filtering unit adopts the differential difference second order filter of multi-mode to realize.
8. current sensor as claimed in claim 4, wherein, the centre frequency of described bandpass filtering unit is corresponding to the frequency of the current output of described alternator, and passband is 10-15Hz.
9. current sensor as claimed in claim 8, wherein, the frequency f of the current output of described alternator is determined according to following formula:
f＝pn/60
Here, p is the quantity of the pole pair of described alternator, and n is the current rotating speed of described alternator, can determine according to the rotating speed of the engine of described automobile.
10. two storage battery car electric power system comprises:
Alternator;
The first accumulator, itself and described alternator parallel coupled are to form current supply circuit;
The second accumulator, itself and starter parallel coupled start the loop to form; And
Control module, it controllably is coupling between described current supply circuit and described startup loop and dc-dc conversion is provided, and comprises current sensor, and this current sensor comprises:
Magnetic core, the output lead of described alternator are wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to institute
State the Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
11. as claimed in claim 10 pair of storage battery car electric power system, wherein, described control module is implemented the charging of dc-dc conversion between operating to realize both to the output of the described first or second accumulator, and dc-dc conversion is implemented in the output of described alternator is operated to realize that described alternator is to the charging of described the second accumulator.
12. a hybrid vehicle comprises:
Electric battery;
Inverter;
Engine;
By described engine-driven alternator;
Drive the motor of running car, it is through described inverter and described electric battery and alternator coupling;
Energy management unit is in charge of the energy flow between described electric battery, inverter, engine, alternator and motor, comprises current sensor, and this current sensor comprises:
Magnetic core, the output lead of described alternator are wrapped on described magnetic core;
Be wound in the Secondary Winding on described magnetic core;
Be wound in the detection winding on described magnetic core; And
Be coupling in the magnetic flux compensation system between described Secondary Winding and detection winding,
Wherein, described magnetic flux compensation system according to the electric potential difference at described detection winding two ends to institute
State the Secondary Winding electric current that affords redress, so that described electric potential difference goes to zero.
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| CN2011103349044A CN103091532A (en) | 2011-10-28 | 2011-10-28 | Electric current transducer used for automobile and based on zero magnetic flux compensation |
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| CN103760405A (en) * | 2014-01-28 | 2014-04-30 | 张正纲 | Device measuring direct current |
| CN104849532A (en) * | 2015-06-09 | 2015-08-19 | 中国电力科学研究院 | Precise current sensor |
| CN106526287A (en) * | 2016-11-25 | 2017-03-22 | 太原理工大学 | Zero-flux micro-current sensor used for leakage current detection |
| CN107037252A (en) * | 2017-03-29 | 2017-08-11 | 中国电力科学研究院 | Electronic compensation type inductive shunt |
| CN105807124B (en) * | 2016-05-27 | 2018-07-17 | 重庆大学 | A kind of DC side electric current of Parallel Resonant load determines method |
| CN108646836A (en) * | 2018-06-22 | 2018-10-12 | 中国科学院高能物理研究所 | High-power Precision Current Component, batch calibrating installation, electric current generates and calibration method |
| CN109188048A (en) * | 2018-07-31 | 2019-01-11 | 中国地质大学（武汉） | A kind of contactless weak current sensor based on passive zero flux |
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| CN111665383A (en) * | 2020-05-22 | 2020-09-15 | 哈尔滨工业大学 | Full-digital fluxgate type current sensor |
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| CN112415249A (en) * | 2020-11-09 | 2021-02-26 | 武汉大学 | A zero-flux current transformer and error modulation method |
| CN114325419A (en) * | 2020-09-28 | 2022-04-12 | 亚德诺半导体国际无限责任公司 | DC signal measurement and battery formation/testing |
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| CN108646836A (en) * | 2018-06-22 | 2018-10-12 | 中国科学院高能物理研究所 | High-power Precision Current Component, batch calibrating installation, electric current generates and calibration method |
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