CN107390009A - A kind of micro-current test device and method - Google Patents
A kind of micro-current test device and method Download PDFInfo
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- CN107390009A CN107390009A CN201710631472.0A CN201710631472A CN107390009A CN 107390009 A CN107390009 A CN 107390009A CN 201710631472 A CN201710631472 A CN 201710631472A CN 107390009 A CN107390009 A CN 107390009A
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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 invention discloses a kind of micro-current test device and method, solves the problems, such as that existing micro-current test device measuring accuracy is poor, input impedance is high, price is high.Described device, comprising circuit conversion unit, compare amplifying unit, display unit, standard voltage source；Micro current signal is converted into micro voltage signal by circuit conversion unit, the adjustable reference voltage signal of standard voltage source output amplitude, compare amplifying unit to reference voltage signal and the amplitude of micro voltage signal, it is compared and amplifies, amplified signal is compared in output, and display unit shows comparative result according to amplified signal is compared.A kind of micro-current method of testing, for described device, is comprised the steps of：The galvanometer of display unit is returned to zero；Reference voltage signal amplitude is adjusted, until galvanometer pointer nulling, obtains reference voltage amplitude；According to reference voltage amplitude and sampling resistor, micro-current value is obtained.Micro-current test device measuring accuracy that the present invention realizes is high, cost is low, easy to use.
Description
Technical field
The present invention relates to field of electrical testing, more particularly to a kind of micro-current test device and method.
Background technology
The test to faint exciting current, especially fire-working article test instrument are often applied in field of electrical testing,
A faint exciting current can be produced during its work.As Devices to test is from analog to digital development, excitation electricity to be measured
The size of stream is also less and less, is developed from milliampere level to microampere, na level.Traditional megameter operation principle is mainly series electrical
Partial pressure method is hindered, using the sampling resistor of high value when testing weak current, such as traditional partial pressure type universal meter 34401A is in 100mA
The impedance of DC current range is 5 Ω, and impedance is 100 Ω during 1mA DC current ranges, causes the internal resistance of megameter very high, is not inconsistent
The working environment of Devices to test lower range is closed, and test result low precision, price are high, cost performance is poor.
The content of the invention
The present invention provides a kind of micro-current test device and method, solve existing micro-current test device measuring accuracy it is poor,
The problem of input impedance is high, price is high.
The embodiment of the present invention provides a kind of intelligent test device, is connected to tested instrument micro-current output end, comprising
Circuit conversion unit, compare amplifying unit, display unit, standard voltage source；The circuit conversion unit is used to believe micro-current
Number micro voltage signal is converted into, includes the first operational amplifier, sampling resistor；The first operational amplifier inverting input is used
In the input micro current signal；The one termination micro current signal output end of the sampling resistor, the other end and described the
One operational amplifier output terminal connects；The standard voltage source is used for the adjustable reference voltage signal of output amplitude；The comparison
Amplifying unit is used for the amplitude to the reference voltage signal and the micro voltage signal, is compared and amplifies, output is compared
Amplified signal；The display unit is used to show the reference voltage signal and the micro voltage according to the relatively amplified signal
The amplitude comparative result of signal.
Further, the circuit conversion unit is also comprising protective resistance, feedback capacity；Described protective resistance one end and institute
The connection of micro current signal output end is stated, the other end is connected with the inverting input of first operational amplifier；The feedback electricity
Appearance is in parallel with the sampling resistor, and one end is connected with the micro current signal output end, the output of the other end and the amplifier
End connection.
Preferably, the model LMC6062AIN of first operational amplifier.
Preferably, the second operational amplifier model AD620 in the relatively amplifying unit.
Further, the relatively amplifying unit also includes first, second, third, fourth, the five, the 6th resistance, the
First, second, third, fourth, fifth, the 6th electric capacity, first, second diode, first, second potentiometer；Second computing
First, the 8th pin of amplifier is connected with two fixing ends of first potentiometer respectively, second, third pin respectively with
The first resistor, 3rd resistor one end, second resistance, the connection of the 4th resistance one end, the 4th pin are connected with power cathode, the
Five pins are connected with the second potentiometer adjustable side, the 6th pin output relatively amplified signal, the 7th pin and power supply
Positive pole connects；The first resistor other end is connected with the micro voltage signal output end；The second resistance other end and institute
State the connection of reference voltage signal output end；Second electric capacity, the first diode, the second diodes in parallel are connected to described second
The pin of operational amplifier second and three-prong, first diode, the positive pole of the second diode are put with the second computing respectively
Big device three-prong, the connection of the second pin；The other end ground connection of the 3rd resistor, the 4th resistance；Three, the 4th resistance
It is in parallel with described first, the 3rd electric capacity respectively；The first potentiometer adjustable side and first potentiometer any one fix
End connection；The 5th resistance both ends are connected with the power cathode, the second potentiometer fixing end respectively；Second electricity
Position another fixing end of device is connected with described 6th resistance one end；The 6th resistance other end is connected with positive source；Described
Four electric capacity both ends are connected with the power cathode, simulation respectively；The 6th electric capacity both ends respectively with second potentiometer
Adjustable side, the connection of simulation ground；The 5th electric capacity both ends are connected with simulation ground, positive source respectively.
Preferably, the display unit includes the 7th resistance, the 7th electric capacity, the 3rd diode, the 4th diode；Described
Seven electric capacity, the 3rd diode, the 4th diode are in parallel with the galvanometer, the negative pole of the 3rd diode, the four or two pole
The one end of the positive pole of pipe with the 7th resistance is connected；The 7th resistance other end receives the relatively amplified signal.
Preferably, the resistance representative value of the sampling resistor is 10G ohms.
Further, the output voltage values of first operational amplifier are：
Wherein, VoFor the output voltage of first operational amplifier, IINFor the input current, RFFor the sampling electricity
Resistance, VosFor the input offset voltage, AvFor the open-loop gain, IbFor the input bias current.
Preferably, the representative value of the first operational amplifier input bias current is pacified for 10 methods, the input imbalance electricity
Pressure representative value is 100 microvolts.
A kind of micro-current method of testing, for described micro-current test device, comprise the steps of：It is single to the display
Galvanometer zeroing in member；The amplitude of the reference voltage signal of standard voltage source output is adjusted, until the inspection
The pointer of flowmeter points to zero point, obtains reference voltage amplitude；According to the reference voltage amplitude and the sampling resistor, calculate
To micro-current value.
Beneficial effect of the present invention includes：Circuit conversion unit of the present invention employs current feedback method, makes circuit conversion unit
Equivalent input impedance be approximately 0, test request of the instrument to be measured in low-resistance environment resistant can be met, measuring accuracy is high, cost
Low, display unit application galvanometer of the present invention, is easy to observe in addition.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is a kind of micro-current test device embodiment；
Fig. 2 is a kind of circuit conversion unit embodiment；
Fig. 3 includes feedback capacity, the circuit conversion unit embodiment of protective resistance to be a kind of；
Fig. 4 is a kind of comparison amplifying unit embodiment comprising AD620 amplifiers；
Fig. 5 is a kind of display unit embodiment；
Fig. 6 is a kind of micro-current method of testing flow embodiment.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described corresponding accompanying drawing.Obviously, described embodiment is only the present invention one
Section Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out under the premise of creative work the every other embodiment obtained, belong to the scope of protection of the invention.
Below in conjunction with accompanying drawing, the technical scheme that various embodiments of the present invention provide is described in detail.
Fig. 1 is a kind of micro-current test device embodiment.The embodiment of the present invention provides a kind of intelligent test device, is connected to
Tested instrument micro-current output end, comprising circuit conversion unit 10, compare amplifying unit 20, display unit 30, standard electric
Potential source 40.
The circuit conversion unit is used to micro current signal being converted into micro voltage signal, includes the first operational amplifier
60th, sampling resistor 50；The first operational amplifier inverting input is used to input the micro current signal；The sampling resistor
A termination micro current signal output end, the other end is connected with first operational amplifier output terminal；The standard electric
Potential source is used for the adjustable reference voltage signal of output amplitude；The relatively amplifying unit is used for the reference voltage signal and institute
The amplitude of micro voltage signal is stated, is compared and amplifies, amplified signal is compared in output；The display unit is used for according to the ratio
The reference voltage signal and the amplitude comparative result of the micro voltage signal are shown compared with amplified signal.
Micro-current test device provided in an embodiment of the present invention can meet that instrument to be measured will in the test of low-resistance environment resistant
Ask, measuring accuracy is high, cost is low.
Fig. 2 is a kind of circuit conversion unit embodiment.The embodiment of the present invention provides a kind of circuit conversion unit, for will be micro-
Current signal is converted into micro voltage signal, includes the first operational amplifier 60, sampling resistor 50.
The first operational amplifier inverting input is used to input the micro current signal；One end of the sampling resistor
The micro current signal output end is connect, the other end is connected with first operational amplifier output terminal.
The circuit conversion unit application reaction type current method, linear zone two is operated according to first operational amplifier
The approximate empty short and empty disconnected principle of individual input, by the test that micro-current test conversion is voltage on feedback resistance.According to empty short
Principle, the impedance of first operational amplifier is the magnitude of voltage approximately equal of infinity, A points and B points, and between A points, B points
Equiva lent impedance be equal to electric current between pressure drop divided by AB between AB, therefore the defeated of the circuit conversion unit translation circuit can be equivalent to
Enter impedance very little, be approximately 0.
Further, it is contemplated that the input bias current of first operational amplifier, input offset voltage factor, it is described
The output voltage values of first operational amplifier are：
Wherein, VoFor the output voltage of first operational amplifier, IINFor the input current, RFFor the sampling electricity
Resistance, VosFor the input offset voltage, AvFor the open-loop gain, IbFor the input bias current.
Preferably, the model LMC6062AIN of first operational amplifier, the first operational amplifier input are inclined
The representative value for putting electric current pacifies (fA) for 10 methods, and the input offset voltage representative value is 100 microvolts (μ V), the sampling resistor
Resistance representative value is 10G ohms (Ω).
It should be noted that the first operational amplifier input bias current, the representative value of input offset voltage be
Amplifier Model is calculated under conditions of being LMC6062AIN, the input bias current of different model amplifier, input imbalance
Voltage representative value is different.
It should be noted that the representative value of the sampling resistor is the high value selected according to engineering experience, also can be in reality
The resistance of different resistances is selected in the use of border, is not specially limited here.
Circuit conversion unit provided in an embodiment of the present invention uses reaction type current method, disclosure satisfy that the low-resistance of Devices to test
Value demand, measurement accuracy is high, cost is low.
Fig. 3 includes feedback capacity, the circuit conversion unit embodiment of protective resistance to be a kind of.The embodiment of the present invention provides one
Kind circuit conversion unit, for micro current signal to be converted into micro voltage signal, includes the first operational amplifier 60, sampling resistor
50th, protective resistance 70, feedback capacity 80.
In the fig. 3 embodiment, first operational amplifier is A1, the sampling resistor is RF, the protective resistance is
Rb, the feedback capacity is Cb。
The first operational amplifier inverting input is used to input the micro current signal；One end of the sampling resistor
The micro current signal output end is connect, the other end is connected with first operational amplifier output terminal；Described protective resistance one end
It is connected with the micro current signal output end, the other end is connected with the inverting input of first operational amplifier；It is described anti-
Feed appearance is in parallel with the sampling resistor, and one end is connected with the micro current signal output end, the other end and the amplifier
Output end connects.
It should be noted that the protective resistance can avoid accidentally the first operational amplifier caused by input overvoltage from damaging
Bad, the feedback capacity is capable of the influence of bucking circuit input capacitance.
Fig. 4 is a kind of comparison amplifying unit embodiment comprising AD620 amplifiers.Implement as one kind relatively amplifying unit
Example, includes the second operational amplifier A2, first resistor R1, second resistance R2, 3rd resistor R3, the 4th resistance R4, the 5th resistance R5、
6th resistance R6, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the
One diode D1, the second diode D2, the first potentiometer RP1, the second potentiometer RP2。
First pin 1 of second operational amplifier, two fixations with first potentiometer respectively of the 8th pin 8
End connection, the second pin 2 are connected with the first resistor, 3rd resistor one end, three-prong 3 and second resistance, the 4th resistance
One end is connected, and the 4th pin 4 is connected with power cathode, and the 5th pin 5 is connected with the second potentiometer adjustable side, the 6th pin
6 outputs relatively amplified signal, the 7th pin 7 are connected with positive source；The first resistor other end and the micro voltage
Signal output part connects；The second resistance other end is connected with the reference voltage signal output end；Second electric capacity,
One diode, the second diodes in parallel are connected to the pin of the second operational amplifier second and three-prong, and the described 1st
The positive pole of pole pipe is connected with the second operational amplifier three-prong, the positive pole of second diode and second operation amplifier
The second pin connection of device；The other end ground connection of the 3rd resistor, the 4th resistance；The 3rd resistor and first electric capacity
Parallel connection, the 4th resistance are in parallel with the 3rd electric capacity；The first potentiometer adjustable side and first potentiometer are any
One fixing end connection；The 5th resistance both ends are connected with the power cathode, the second potentiometer fixing end respectively；Institute
Another fixing end of the second potentiometer is stated to be connected with described 6th resistance one end；The 6th resistance other end connects with positive source
Connect；The 4th electric capacity both ends are connected with the power cathode, simulation respectively；The 6th electric capacity both ends are respectively with described
Two potentiometer adjustable sides, the connection of simulation ground；The 5th electric capacity both ends are connected with simulation ground, positive source respectively.
It should be noted that the second operational amplifier model AD620 in the embodiment of the present invention, other model operation amplifiers
Device has other annexations, is not described here.
It should be noted that first electric capacity, the second electric capacity, the 3rd electric capacity and first resistor, second resistance constitute
Low-pass filter circuit, high-frequency interferencing signal can be filtered out；The first resistor, second resistance, the first diode, the second diode
Input protection circuit is constituted, input overvoltage protection has been carried out to second operational amplifier；The 3rd resistor, the 4th electricity
Hinder and provide quiescent bias current for second operational amplifier, it is ensured that the second operational amplifier steady operation；It is described
First potentiometer is the gain setting resistor of second operational amplifier；Second potentiometer, the 5th resistance, the 6th resistance
Zeroing circuit is constituted, is returned to zero by the pin for changing second operational amplifier.
Fig. 5 is a kind of display unit embodiment.As a kind of display unit embodiment, the 7th resistance R is included7, the 7th electricity
Hold C7, the 3rd diode D3, the 4th diode D4。
7th electric capacity, the 3rd diode, the 4th diode are in parallel with the galvanometer, the 3rd diode
Negative pole is connected with one end of the 7th resistance, and the positive pole of the 4th diode is connected with one end of the 7th resistance；Institute
State the 7th resistance other end and receive the relatively amplified signal.
It should be noted that the circuit of the 7th resistance, the 7th electric capacity composition provides low pass filtered for the galvanometer
Wave energy, the 7th resistance, the 3rd diode, the 4th diode constitute the protection circuit of the galvanometer pointer gauge outfit.
It should be noted that the galvanometer pointer gauge outfit can enter line displacement according to the voltage comparison signal, work as institute
The symbol for stating voltage comparison signal is timing, and the galvanometer pointer gauge outfit is offset to a direction, when the voltage ratio is relatively believed
Number symbol be timing, the galvanometer pointer gauge outfit is offset to another direction, when the comparison signal voltage is zero, institute
State galvanometer pointer gauge outfit and be biased back to dead-center position, therefore need to carry out zeroing school to its pointer gauge outfit before using the galvanometer
It is accurate.
Fig. 6 is a kind of micro-current method of testing flow embodiment.The embodiment of the present invention provides a kind of micro-current method of testing,
For described micro-current test device,
The micro-current method of testing comprises the steps of：
Step 101, the galvanometer in the display unit is returned to zero.
In a step 101, the galvanometer pointer gauge outfit can enter line displacement according to the sign of input voltage, therefore make
Need first to carry out zeroing calibration to it when being tested with the galvanometer.
Step 102, the amplitude of the reference voltage signal of standard voltage source output is adjusted, until the inspection stream
The pointer of meter points to zero point, obtains reference voltage amplitude.
In a step 102, the output voltage of the standard voltage source is slowly heightened, while observes the galvanometric pointer
Point to, when the galvanometric pointer points to dead-center position, no longer adjust the output voltage of the standard voltage source, now institute
It is identical with the magnitude of voltage for the micro voltage signal that the circuit conversion unit exports to state the output voltage values of standard voltage source, as joins
Examine voltage amplitude.
Step 103, according to the reference voltage amplitude and the sampling resistor, micro-current value is calculated.
In step 103, according to Ohm's law, the ratio of the reference voltage amplitude and the sampling resistor is described
Micro-current value.
The micro-current test device, tested instrument micro-current output end is connected to, includes circuit conversion unit, ratio
Compared with amplifying unit, display unit, standard voltage source；The circuit conversion unit is used to micro current signal being converted into micro voltage letter
Number, include the first operational amplifier, sampling resistor；The first operational amplifier inverting input is used to input the micro-current
Signal；The one termination micro current signal output end of the sampling resistor, the other end export with first operational amplifier
End connection；The standard voltage source is used for the adjustable reference voltage signal of output amplitude；The relatively amplifying unit is used for institute
The amplitude of reference voltage signal and the micro voltage signal is stated, is compared and amplifies, amplified signal is compared in output；The display
Unit is used to show that the Amplitude Ratio of the reference voltage signal and the micro voltage signal is relatively tied according to the relatively amplified signal
Fruit.
It should also be noted that, term " comprising ", "comprising" or its any other variant are intended to nonexcludability
Comprising so that process, method, commodity or equipment including a series of elements not only include those key elements, but also wrapping
Include the other element being not expressly set out, or also include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that wanted including described
Other identical element also be present in the process of element, method, commodity or equipment.
Embodiments of the invention are the foregoing is only, are not intended to limit the invention.For those skilled in the art
For, the present invention can have various modifications and variations.All any modifications made within spirit and principles of the present invention, it is equal
Replace, improve etc., it should be included within scope of the presently claimed invention.
Claims (10)
1. a kind of micro-current test device, it is connected to tested instrument micro-current output end, it is characterised in that turn comprising circuit
Change unit, compare amplifying unit, display unit, standard voltage source；
The circuit conversion unit is used to micro current signal being converted into micro voltage signal, includes the first operational amplifier, sampling
Resistance；
The first operational amplifier inverting input is used to input the micro current signal；
The one termination micro current signal output end of the sampling resistor, the other end and first operational amplifier output terminal
Connection；
The standard voltage source is used for the adjustable reference voltage signal of output amplitude；
The relatively amplifying unit is used for the amplitude to the reference voltage signal and the micro voltage signal, is compared and puts
Greatly, amplified signal is compared in output；
The display unit is used to show the reference voltage signal and the micro voltage signal according to the relatively amplified signal
Amplitude comparative result.
2. micro-current test device as claimed in claim 1, it is characterised in that the circuit conversion unit is also comprising protection electricity
Resistance, feedback capacity；
Described protective resistance one end is connected with the micro current signal output end, and the other end is anti-with first operational amplifier
Phase input connects；
The feedback capacity is in parallel with the sampling resistor, and one end is connected with the micro current signal output end, the other end and institute
State the output end connection of amplifier.
3. micro-current test device as claimed in claim 1, it is characterised in that the model of first operational amplifier
LMC6062AIN。
4. micro-current test device as claimed in claim 1, it is characterised in that the second computing in the relatively amplifying unit
Amplifier Model is AD620.
5. micro-current test device as claimed in claim 4, it is characterised in that the relatively amplifying unit also comprising first,
Second, third, fourth, fifth, the 6th resistance, first, second, third, fourth, the five, the 6th electric capacity, first, second 2 poles
Pipe, first, second potentiometer；
First, the 8th pin of second operational amplifier is connected with two fixing ends of first potentiometer respectively, the
2nd, three-prong is connected with the first resistor, 3rd resistor one end, second resistance, the 4th resistance one end respectively, the 4th pin
It is connected with power cathode, the 5th pin is connected with the second potentiometer adjustable side, the 6th pin output relatively amplification letter
Number, the 7th pin is connected with positive source；
The first resistor other end is connected with the micro voltage signal output end；
The second resistance other end is connected with the reference voltage signal output end；
Second electric capacity, the first diode, the second diodes in parallel be connected to the pin of the second operational amplifier second and
Three-prong, first diode, the second diode positive pole respectively with the second operational amplifier three-prong, the second pin
Connection；
The other end ground connection of the 3rd resistor, the 4th resistance；
Three, the 4th resistance is in parallel with described first, the 3rd electric capacity respectively；
The first potentiometer adjustable side is connected with described any one fixing end of first potentiometer；
The 5th resistance both ends are connected with the power cathode, the second potentiometer fixing end respectively；
Another fixing end of second potentiometer is connected with described 6th resistance one end；
The 6th resistance other end is connected with positive source；
The 4th electric capacity both ends are connected with the power cathode, simulation respectively；
The 6th electric capacity both ends are connected with the second potentiometer adjustable side, simulation respectively；
The 5th electric capacity both ends are connected with simulation ground, positive source respectively.
6. micro-current test device as claimed in claim 1, it is characterised in that the display unit includes the 7th resistance, the
Seven electric capacity, the 3rd diode, the 4th diode；
7th electric capacity, the 3rd diode, the 4th diode are in parallel with the galvanometer, and the 3rd diode is born
The one end of pole, the positive pole of the 4th diode with the 7th resistance is connected；
The 7th resistance other end receives the relatively amplified signal.
7. micro-current test device as claimed in claim 1, it is characterised in that the resistance representative value of the sampling resistor is
10G ohms.
8. micro-current test device as claimed in claim 1, it is characterised in that the output voltage of first operational amplifier
It is worth and is：
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Wherein, VoFor the output voltage of first operational amplifier, IINFor the input current, RFFor the sampling resistor,
VosFor the input offset voltage, AvFor the open-loop gain, IbFor the input bias current.
9. micro-current test device as claimed in claim 3, it is characterised in that first operational amplifier inputs biased electrical
The representative value of stream is pacified for 10 methods, and the input offset voltage representative value is 100 microvolts.
10. a kind of micro-current method of testing, for the micro-current test device described in any one of claim 1~9, its feature exists
In comprising the steps of：
Galvanometer in the display unit is returned to zero；
The amplitude of the reference voltage signal of standard voltage source output is adjusted, until the galvanometric pointer points to
Zero point, obtain reference voltage amplitude；
According to the reference voltage amplitude and the sampling resistor, micro-current value is calculated.
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| CN201710631472.0A CN107390009B (en) | 2017-07-28 | 2017-07-28 | A kind of micro-current test device and method |
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| CN108594020A (en) * | 2018-04-27 | 2018-09-28 | 陈德文 | The highly sensitive conductance of number display and high resistance measurement measuring circuit and method |
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| CN109116785A (en) * | 2018-09-28 | 2019-01-01 | 中国船舶重工集团公司第七0七研究所九江分部 | A kind of online self-test control circuit device of amplifier |
| CN111398668A (en) * | 2020-04-07 | 2020-07-10 | 中国原子能科学研究院 | Measuring circuit and device |
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| CN108594020A (en) * | 2018-04-27 | 2018-09-28 | 陈德文 | The highly sensitive conductance of number display and high resistance measurement measuring circuit and method |
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| CN111398668A (en) * | 2020-04-07 | 2020-07-10 | 中国原子能科学研究院 | Measuring circuit and device |
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| CN114113767A (en) * | 2021-11-12 | 2022-03-01 | 天津航空机电有限公司 | Circuit for improving small current acquisition precision of solid-state power controller |
| CN114019415A (en) * | 2022-01-06 | 2022-02-08 | 宜矽源半导体南京有限公司 | Integrated short-circuit current detector with variable threshold, self-calibration and high precision |
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| CN116165420B (en) * | 2023-04-20 | 2023-10-03 | 杭州瑞盟科技股份有限公司 | Current detection circuit and device |
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