CN104376961B - Degaussing circuit, magnetic modulating system and residual current device - Google Patents
Degaussing circuit, magnetic modulating system and residual current device Download PDFInfo
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- CN104376961B CN104376961B CN201310359678.4A CN201310359678A CN104376961B CN 104376961 B CN104376961 B CN 104376961B CN 201310359678 A CN201310359678 A CN 201310359678A CN 104376961 B CN104376961 B CN 104376961B
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Abstract
Degaussing circuit, treats demagnetization device including one（10）, a winding（20）, a sampling resistor（30）, an excitation voltage source（40）, a threshold value generating unit（50）With a commutation control unit（60）.Winding is arranged on to be treated on demagnetization device.Sampling resistor exportable sampled voltage signal.The exportable driving voltage of excitation voltage source.Its exportable one commutation threshold signal reducing in time of threshold value generating unit.Commutation control unit can determine whether that the relation of sampled voltage signal and commutation threshold signal changes polarity and the size of reversal voltage signal, and this excitation voltage source to control the polarity of driving voltage and the change of size by the change of reversal voltage signal polarity and size.Degaussing circuit has closed feedback loop, can automatically operate in very high frequency, and its degaussing process is the shortest to only need to some milliseconds.
Description
Technical field
The present invention relates to a kind of degaussing circuit, using the magnetic modulating system of this degaussing circuit and remaining using this degaussing circuit
Aftercurrent device.
Background technology
Permeability magnetic material can have remanent magnetism after magnetizing in magnetic field, for the core material of transformator and inductance, flow through around
The surge current of group will also result in remanent magnetism.For the measuring system that some contain magnetic core, remanent magnetism phenomenon can cause certain
Measurement error.Existing demagnetization mode is mainly passed through to heat permeability magnetic material, and passes through exchange on the winding of permeability magnetic material
Electricity produces the diminishing AC magnetic field of amplitude.Heating permeability magnetic material is generally applied to the production of core material, but cannot disappear
The remanent magnetism occurring in application process except permeability magnetic material；The mode that indirect current produces the diminishing AC magnetic field of amplitude disappears
Magnetic, needs the erasing time grown very much.
Content of the invention
It is an object of the invention to provide a kind of degaussing circuit, to realize the quick demagnetization to permeability magnetic material.
It is a further object to provide the magnetic modulating system using this degaussing circuit.
It is also another object of the present invention to provide the residual current device using this magnetic modulating system.
The invention provides a degaussing circuit, including one treat demagnetization device, winding, sampling resistor, one
Individual excitation voltage source, a threshold value generating unit and a commutation control unit.Treat that demagnetization device can be disappeared by an AC magnetic field
Magnetic.Winding is arranged on to be treated on demagnetization device.Sampling resistor and windings in series, its exportable sampled voltage letter representing pressure drop thereon
Number.Excitation voltage source is connected with winding and sampling resistor, its exportable driving voltage producing AC magnetic field.Threshold value generating unit
Its exportable one commutation threshold signal reducing in time.Commutation control unit can input sample voltage signal and commutation threshold value
Signal, and its exportable reversal voltage signal is to excitation voltage source, commutation control unit can determine whether sampled voltage signal with
The commutation relation of threshold signal and change polarity and the size of reversal voltage signal, and this excitation voltage source is believed by reversal voltage
The change of number polarity and size is controlling the polarity of driving voltage and the change of size.
Degaussing circuit passes through to make the saturation depth treating demagnetization device shoal over time so that treating demagnetization device demagnetization, it is gathered around
There is closed feedback loop, therefore can automatically operate in very high frequency (hundreds of or even thousand of Hz), the shortest need of its degaussing process
Will some milliseconds.
In another schematic embodiment of degaussing circuit, the absolute value of sampled voltage signal is equal to commutation threshold value
Signal, commutation control unit changes reversal voltage signal polarity.
In another kind of schematically embodiment of degaussing circuit, if the differential value of sampled voltage signal absolute value is equal to
Commutation threshold signal, commutation control unit changes reversal voltage signal polarity.
In another schematic embodiment of degaussing circuit, threshold value generating unit 50 include a plurality of by resistance simultaneously
The parallel circuit of connection, and threshold value generating unit 50 can be by optionally making in a plurality of parallel branches of parallel circuit
One or more on or off come to change commutation threshold signal size.
In another schematic embodiment of degaussing circuit, threshold value generating unit is included by first resistor and first
The tie point that controlled switch is connected in series；The second branch road being connected in series by second resistance and the second controlled switch；By the 3rd
The 3rd branch road that resistance and the 3rd controlled switch are connected in series；The 4th being connected in series by the 4th resistance and the 4th controlled switch
Road；Tie point, the second branch road, the 3rd branch road and the 4th branch circuit parallel connection connect, wherein：First controlled switch, second controlled open
Close, the junction point of the 3rd controlled switch and the 4th controlled switch is electrically connected at ground potential, first resistor, second resistance, the 3rd
The junction point of resistance and the 4th resistance is electrically connected with the 5th resistance, and the 5th resistance is electrically connected at first and supplies electric potential, and commutate threshold
Value signal is the current potential that the 5th resistance is not connected one end with first for electric potential；With the first controller, it can control first respectively
The turning on and off of controlled switch, the second controlled switch, the 3rd controlled switch and the 4th controlled switch.
In another schematic embodiment of degaussing circuit, threshold value generating unit includes the electricity of a plurality of series connection
Resistance, and threshold value generating unit can change commutation by optionally bypassing one or more of the plurality of series resistance
The size of threshold signal.
In another schematic embodiment of degaussing circuit, threshold value generating unit includes the 6th electricity being connected in series
Resistance, the 7th resistance, the 8th resistance and the 9th resistance, one end that the 9th resistance is not connected with the 8th resistance can be electrically connected at ground electricity
Position；With the 6th controlled switch of the 6th resistor coupled in parallel and the 7th controlled switch of the 7th resistor coupled in parallel and the 8th resistor coupled in parallel
8th controlled switch and the 9th controlled switch with the 9th resistor coupled in parallel；Tenth resistance, its one end is electrically connected at one second
For electric potential, the other end is electrically connected at one end that the 6th resistance is not electrically connected with the 7th resistance, and commutation threshold signal is the
Ten resistance and the current potential of the 6th ohmic connection points；Second controller, its control respectively the 6th controlled switch, the 7th controlled switch,
The turning on and off of 8th controlled switch and the 9th controlled switch.
Present invention also offers a kind of magnetic modulating system, including above-mentioned degaussing circuit and a wave filter.Wave filter inputs
End receives sampled voltage signal, and exports the filtering voltage signal having filtered the driving voltage of superposition in sampled voltage signal, should
Filtering voltage signal can represent the size of the electric current to be measured measured by magnetic modulating system.
In another schematic embodiment of magnetic modulating system, magnetic modulating system includes an amplifier, and it is defeated
Enter end and receive filtering voltage signal, and export the amplified amplification voltage signal of filtering voltage signal.
In another schematic embodiment of magnetic modulating system, excitation voltage source can input sample voltage signal,
And driving voltage is sampled voltage signal and reversal voltage signal sum.
Present invention also offers a kind of residual current device, including above-mentioned magnetic modulating system and a processor.Processor
Can input filter voltage signal, and judge the size of electric current to be measured in conductor according to filtering voltage signal.
In another schematic embodiment of residual current device, processor exportable one be preset in therein
Threshold value changes signal to threshold value generating unit, and threshold value generating unit changes signal according to threshold value and controls commutation threshold signal in time
Reduce.
Brief description
The following drawings only does schematic illustration and explanation to the present invention, not delimit the scope of the invention.
Fig. 1 is used for a kind of structural representation of exemplary embodiment of degaussing circuit is described.
Fig. 2 is used for a kind of structural representation of exemplary embodiment of threshold value generating unit is described.
Fig. 3 is used for the structural representation of threshold value generating unit another kind exemplary embodiment is described.
Fig. 4 is used for a kind of structural representation of exemplary embodiment of magnetic modulating system is described.
Fig. 5 is used for a kind of structural representation of exemplary embodiment of residual current device is described.
Label declaration
10 treat demagnetization device
20 windings
30 sampling resistors
40 excitation voltage source
50 threshold value generating units
51 first controllers
52 second controllers
60 commutation control units
80 wave filter
82 amplifiers
84 processors.
Specific embodiment
In order to be more clearly understood to the technical characteristic of invention, purpose and effect, now compare the brief description present invention
Specific embodiment, in the various figures identical label represent identical part.For making simplified form, each in figure only schematically
Indicate part related to the present invention, they do not represent it as the practical structures of product.In addition, so that drawing is simple
The clean part readily appreciating, having identical structure or function in some in figures, only symbolically depicts one of, or only
Mark one of.
Herein, " schematic " expression " serving as example, example or explanation ", should not will be described herein as " showing
Any diagram of meaning property ", embodiment are construed to a kind of preferred or more advantage technical scheme.
Herein, " first ", " second ", " the 3rd ", " the 4th ", " the 5th ", " the 6th ", " the 7th ", " the 8th ", "
Nine ", " tenth " etc. is only used for differentiation each other, rather than represents their significance level and order etc..
Fig. 1 is used for a kind of structural representation of exemplary embodiment of degaussing circuit is described.As illustrated, degaussing circuit bag
Include one and treat that 40, threshold value of 10, winding of demagnetization device, 30, excitation voltage source of 20, sampling resistor occurs list
Unit 50 and a control unit 60.
Wherein, treat that demagnetization device 10 can pass through alternating magnetic field demagnetization, shown in figure, treat that demagnetization device 10 is magnet ring, but demagnetization
Circuit is not limited to magnet ring demagnetization, can also be to other magnetic conductive component demagnetizations.Winding 20 is arranged on magnet ring 10, when around
By by driving voltage V in group 20extThe exciting current I producingextWhen, magnet ring 10 produces alternating magnetic field.Sampling resistor 30, around
Group 20 is connected in series and is connected in series with excitation voltage source 40, and the exciting current being produced by the driving voltage of excitation voltage source 40
IextFlow through sampling resistor 30 and winding 20.When in sampling resistor 30 pass through exciting current IextWhen, its exportable sampling electricity
Pressure signal SV, sampled voltage signal SVThe voltage drop value on sampling resistor 30 can be reflected.
The exportable commutation threshold signal S of threshold value generating unit 50t, commutate threshold signal StCan reduce in time.One
Plant in exemplary embodiment, threshold value generating unit 50 can include the parallel circuit of multiple resistor coupled in parallel, and threshold value occurs list
Unit 50 can change commutation threshold value letter by optionally making one or more of multiple parallel branches on or off
Number StSize.For example, as shown in Fig. 2 threshold value generating unit 50 include 51, first resistor R1 of first controller,
One second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, first controlled switch
S1, the second controlled switch S2, a 3rd controlled switch S3 and a 4th controlled switch S4.Wherein, first resistor R1,
One second resistance R2,3rd resistor R3 and a 4th resistance R4 are connected in parallel.First controlled switch S1 is serially connected with
One resistance R1, the second controlled switch S2 is serially connected with second resistance R2, and the 3rd controlled switch S3 is serially connected with 3rd resistor R3, and the 4th is subject to
Control switch S4 is serially connected with the 4th resistance R4.5th resistance R5 one end can be electrically connected at one first and supply electric potential VS1, the other end
Not controlled with first in first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 opening can be electrically connected with
Close one end that S1, the second controlled switch S2, the 3rd controlled switch S3 and the 4th controlled switch S4 are electrically connected with.First controlled switch
S1, the second controlled switch S2, the 3rd controlled switch S3 and the 4th controlled switch S4 not with first resistor R1, second resistance R2,
One end that three resistance R3 and the 4th resistance R4 connect can be electrically connected at ground potential.First controller 51 can control first to be subject to respectively
Control switch S1, the second controlled switch S2, the 3rd controlled switch S3 and the 4th controlled switch S4 turn on and off.Commutation threshold signal
StDo not supply electric potential V for the 5th resistance R5 with firstS1Connect the current potential of one end.The resistance quantity of use can also be changed, to become
Change the pace of change of commutation threshold signal.
Using threshold value generating unit as shown in Figure 2, in the initial time of degaussing circuit work, the first controlled switch S1 closes
Close, the second controlled switch S2, the 3rd controlled switch S3 and the 4th controlled switch S4 disconnect.First resistor R1 and the 5th resistance R5 string
Connection, now commutate threshold signal StMaximum, and the threshold signal S that commutatestPressure drop for first resistor R1.Through a time interval
Afterwards, the first controlled switch S1 and the second controlled switch S2 closure, the 3rd controlled switch S3 and the 4th controlled switch S4 disconnects.First
Connect with the 5th resistance R5 after resistance R1 and the parallel connection of second resistance R2, now commutate threshold signal StFor first resistor R1 and second
Pressure drop after resistance R2 parallel connection, the pressure drop comparing first resistor R1 decreases.Again after a time interval, first is controlled
Switch S1, the second controlled switch S2 and the 3rd controlled switch S3 closure, the 4th controlled switch S4 disconnects.First resistor R1, second
Connect with the 5th resistance R5 after resistance R2 and the parallel connection of 3rd resistor R3, now commutate threshold signal StFor first resistor R1, second
Pressure drop after resistance R2 and the parallel connection of 3rd resistor R3, compares under the pressure drop further after first resistor R1 and the parallel connection of second resistance R2
Fall.Again after a time interval, the first controlled switch S1, the second controlled switch S2, the 3rd controlled switch S3 and the 4th are subject to
Control switch S4 closure, is gone here and there with the 5th resistance R5 after first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 parallel connection
Connection, now commutate threshold signal StFor the pressure after first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4 parallel connection
Fall, now commutate threshold signal StMinimum.
In another embodiment, threshold value generating unit 50 can include the resistance of multiple series connection, and threshold value occurs list
Unit 50 can change the big of commutation threshold signal by optionally bypassing one or more of the plurality of series resistance
Little.For example, as shown in figure 3, threshold value generating unit 50 include 52, the 6th resistance R6 of a second controller, one the 7th
Resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 6th controlled switch S6, one
7th controlled switch S7, a 8th controlled switch S8 and a 9th controlled switch S9.Wherein, the 6th resistance R6, the 7th electricity
Resistance R7, the 8th resistance R8 and the 9th resistance R9 series connection.6th controlled switch S6 and the 6th resistor coupled in parallel；7th controlled switch S7 with
7th resistance R7 is in parallel；8th controlled switch S8 is in parallel with the 8th resistance R8；9th controlled switch S9 is in parallel with the 9th resistance R9.
Tenth resistance R10 one end is electrically connected at one second and supplies electric potential VS2, the other end is electrically connected at the 6th resistance R6 not with
One end that seven resistance R7 are electrically connected with.One end that 9th resistance R9 is not connected with the 8th resistance R8 can be electrically connected at ground potential.
Second controller 52 can control the 6th controlled switch S6, the 7th controlled switch S7, the 8th controlled switch S8 and the 9th controlled respectively
Switch S9 turns on and off.Commutation threshold signal StDo not supply electric potential V for the tenth resistance R10 with secondS2Connect the electricity of one end
Position.The resistance quantity of use can also be changed, to change the pace of change of commutation threshold signal.Although display the 6th is subject in Fig. 3
Control switch S6, the 7th controlled switch S7, the 8th controlled switch S8 and the 9th controlled switch S9 are connected in series, but the 6th controlled switch
S6, the 7th controlled switch S7, the 8th controlled switch S8 and the 9th controlled switch S9 only need to respectively with the 6th resistance R6, the 7th electricity
Resistance R7, the 8th resistance R8 and the 9th resistance R9 are in parallel.
Using threshold value generating unit as shown in Figure 3, in the initial time of degaussing circuit work, the 6th controlled switch S6,
7th controlled switch S7, the 8th controlled switch S8 and the 9th controlled switch S9 disconnect.6th resistance R6, the 7th resistance R7, the 8th
Resistance R8, the 9th resistance R9 and the tenth resistance R10 series connection, now commutate threshold signal StMaximum, and the threshold signal S that commutatestFor
Six resistance R6, the 7th resistance R7, the pressure drop of the 8th resistance R8 and the 9th resistance R9.After a time interval, the 6th is controlled
Switch S6 closure, remaining controlled switch disconnects.6th resistance R6 is shorted, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9
Connect with the tenth resistance R10, now commutate threshold signal StPressure for the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9
Fall, compares the 6th resistance R6, the 7th resistance R7, the pressure drop of the 8th resistance R8 and the 9th resistance R9 decrease.Again through one
After time interval, the 6th controlled switch S6 and the 7th controlled switch S7 closure, remaining controlled switch disconnects.6th resistance R6 and
Seven resistance R7 are shorted, and the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10 connect, and now commutate threshold signal StFor
The pressure drop of eight resistance R8 and the 9th resistance R9, compare the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 pressure drop further
Decline.Again after a time interval, the first controlled switch S1, the second controlled switch S2 and the 3rd controlled switch S3 close,
4th controlled switch S4 disconnects, and the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 are shorted, the 9th resistance R9 and the 10th electricity
Resistance R10 series connection, now commutate threshold signal StFor the pressure drop of the 10th resistance R10, now commutate threshold signal StMinimum, the 8th electricity
The pressure drop of resistance R8 and the 9th resistance R9 declines further.Again after a time interval, all controlled switch all close, and the 6th
Resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9 are shorted, and now commutate threshold signal StMinimum, and commutate
Threshold signal StIt is zero.
For the threshold value generating unit shown in Fig. 2 and Fig. 3, the time interval of the threshold signal change that commutates, that is, each is controlled
The action of switch is spaced apart the preset value of degaussing circuit, can adjustment time interval as needed size, to adjust commutation threshold
The speed that value signal reduces in time.The switching sequence of each controlled switch is also not limited to this, can adjust as needed.It is subject to
Control switch can adopt relay and analog switch.
Commutation control unit 60 can input sample voltage signal SVWith commutation threshold signal St, and commutation control unit 60 can
One reversal voltage signal S of outputcTo excitation voltage source 40.Turnover voltage signal ScThere is positive-negative polarity, and excitation voltage source 40
The polarity of institute's output drive voltage and size are by turnover voltage signal ScPolarity determine.Commutation control unit 60 can determine whether to sample
Voltage signal SVWith commutation threshold signal StRelation and change reversal voltage signal ScPolarity and size.
Judge sampled voltage signal S in commutation control unit 60VWith commutation threshold signal StA kind of embodiment of relation
In, commutation control unit 60 is by sampled voltage signal SVAbsolute value with commutation threshold signal StRelatively, if sampled voltage signal SV
Absolute value be equal to commutation threshold signal St, commutation control unit 60 change reversal voltage signal ScPolarity, and reduce reversal voltage
Signal ScSize so that reversal voltage signal ScAbsolute value be equal to commutation threshold signal St.Sampled voltage signal SVAbsolute
Value is linear with the size of magnetic field intensity, therefore can be used for judging the excitation depth of magnetic core.
Judge sampled voltage signal S in commutation control unit 60VWith commutation threshold signal StThe another embodiment of relation
In, commutation control unit 60 is by sampled voltage signal SVThe differential value of absolute value and commutation threshold signal StRelatively, if sampled voltage
Signal SVThe differential value of absolute value is equal to commutation threshold signal St, commutation control unit 60 change reversal voltage signal ScPolarity and
Reduce reversal voltage signal ScSize so that reversal voltage signal ScThe differential value of absolute value is equal to commutation threshold signal St.Adopt
Sample voltage signal SVThe differential value of absolute value can magnetic reaction fields intensity size, therefore can be used for judging the excitation depth of magnetic core.
Degaussing circuit passes through to make the saturation depth treating demagnetization device shoal over time so that treating demagnetization device demagnetization.For
Traditional open loop eraser system, because the exciting current of demagnetization is fixing, its frequency must sufficiently low so that erasing current energy
Enough rise to the value of enough sizes.For degaussing circuit, it has closed feedback loop, therefore can automatically operate in very high frequency
Rate (hundreds of or even thousand of Hz), its degaussing process is the shortest to only need to some milliseconds.
Fig. 4 is used for a kind of structural representation of exemplary embodiment of magnetic modulating system is described.As illustrated, magnetic modulation system
System includes above-mentioned degaussing circuit and a wave filter 80.The input of wave filter 80 receives sampled voltage signal SV, and export filter
Wave voltage signal Sf.Wherein filtering voltage signal SfFilter sampled voltage signal SVThe driving voltage V of middle superpositionext, and filter
Voltage signal SfReflect the specific size of electric current to be measured.
As shown in figure 4, when magnetic modulating system is used for the electric current to be measured pass through on the conductor 12 that measurement is located in magnet ring,
Commutation threshold signal keeps a definite value, and because magnetic modulating system has the function of demagnetization, before measuring electric current to be measured and complete
After becoming measurement, can automatically reduce the remnant field intensity of magnetic core, thus reducing the measurement error causing because of remnant field intensity,
Improve reliability and the precision of magnetic modulating system.
As shown in figure 4, in a kind of exemplary embodiment of magnetic modulating system, magnetic modulating system includes a signal and amplifies
Device 82, its input can input filter voltage signal Sf, and signal amplifier can amplify filtering voltage signal SfSignal intensity
Afterwards, one amplification voltage signal S of outputA.By arranging amplifier, can be by the amplification voltage signal S of the output of amplifierADynamic
State scope, will receive this amplification voltage signal S with follow-upAThe input dynamic range of process circuit match, inspection is improved with this
The resolution surveyed and precision.
As shown in figure 4, in a kind of exemplary embodiment of magnetic modulating system, the input of excitation voltage source 40 except
Input reversal voltage signal ScOutward, also can input sample voltage signal SV, and driving voltage VextSize be equal to sampled voltage believe
Number SVWith reversal voltage signal ScSum.Because winding is connected so that the voltage portion that originally should be carried on winding with sampling resistor
Divide to fall on sampling resistor, this leads to fall the voltage on winding to change with the change of exciting current, makes to electricity to be measured
The measurement result linearity of stream is deteriorated, by by the voltage compensation on sampling resistor, on driving voltage, the voltage on winding is not
Excited target size of current affects.
Fig. 5 is used for a kind of structural representation of exemplary embodiment of residual current device is described.As illustrated, it is remaining
Current device includes above-mentioned magnetic modulating system and a processor 84.Wherein, processor 84 can input amplification voltage signal SA(put
Big voltage signal SABy filtering voltage signal SfAmplified device obtains after amplifying), and according to amplification voltage signal SAJudge in conductor
The size of electric current to be measured, thus makes protection act to cut off residual current.
As shown in figure 5, in a kind of exemplary embodiment of residual current device, being preset with a threshold value in processor 84
Change signal Sw, and threshold value changes signal SwThreshold signal S can be adjustedtNumerical value and the persistent period.Processor 84 exportable one
Individual threshold value changes signal SwTo threshold value generating unit 50, threshold value generating unit 50 changes signal S according to threshold valuewControl commutation threshold value
Signal StReduce in time.Certainly, according to actual needs, processor 84 calculates this threshold value also dependent on other monitoring variables and changes
Varying signal Sw.
It should be understood that although this specification is according to the description of each embodiment, but not each embodiment only comprises one
Individual independent technical scheme, only for clarity, those skilled in the art should will say this narrating mode of description
Bright book can also form those skilled in the art permissible through appropriately combined as an entirety, the technical scheme in each embodiment
The other embodiment understanding.
The a series of detailed description of those listed above is only for illustrating of the possible embodiments of the present invention,
They simultaneously are not used to limit the scope of the invention, all equivalent embodiments made without departing from skill spirit of the present invention or change
More, as combination, segmentation or the repetition of feature, should be included within the scope of the present invention.
Claims (11)
1. degaussing circuit, including：
Demagnetization device (10) can be treated by an AC magnetic field demagnetization for one；
One winding (20) treating on demagnetization device (10) described in being arranged on；
The sampling resistor (30) that one is connected with described winding (20), its exportable sampled voltage signal representing pressure drop thereon
(SV)；
One excitation voltage source (40) connected with described winding (20) and described sampling resistor (30), its exportable generation is described
Driving voltage (the V of AC magnetic fieldext)；
It is characterized in that described degaussing circuit also includes：
One threshold value generating unit (50), its exportable one commutation threshold signal (S reducing in timet)；With
One commutation control unit (60), it can input described sampled voltage signal (SV) and described commutation threshold signal (St), and
Its exportable reversal voltage signal (Sc) to described excitation voltage source (40), described commutation control unit (60) can determine whether institute
State sampled voltage signal (SV) and described commutation threshold signal (St) relation and thus change described reversal voltage signal (Sc)
Polarity and size, and this excitation voltage source (40) is by described reversal voltage signal (Sc) polarity and size change to control
State driving voltage (Vext) polarity and size change；
If wherein described sampled voltage signal (SV) absolute value be equal to described commutation threshold signal (St), described commutation control list
First (60) change described reversal voltage signal (Sc) polarity.
2. degaussing circuit, including：
Demagnetization device (10) can be treated by an AC magnetic field demagnetization for one；
One winding (20) treating on demagnetization device (10) described in being arranged on；
The sampling resistor (30) that one is connected with described winding (20), its exportable sampled voltage signal representing pressure drop thereon
(SV)；
One excitation voltage source (40) connected with described winding (20) and described sampling resistor (30), its exportable generation is described
Driving voltage (the V of AC magnetic fieldext)；
It is characterized in that described degaussing circuit also includes：
One threshold value generating unit (50), its exportable one commutation threshold signal (S reducing in timet)；With
One commutation control unit (60), it can input described sampled voltage signal (SV) and described commutation threshold signal (St), and
Its exportable reversal voltage signal (Sc) to described excitation voltage source (40), described commutation control unit (60) can determine whether institute
State sampled voltage signal (SV) and described commutation threshold signal (St) relation and thus change described reversal voltage signal (Sc)
Polarity and size, and this excitation voltage source (40) is by described reversal voltage signal (Sc) polarity and size change to control
State driving voltage (Vext) polarity and size change；
If wherein described sampled voltage signal (SV) absolute value differential value be equal to described commutation threshold signal (St), described commutation
Control unit (60) changes described reversal voltage signal (Sc) polarity.
3. degaussing circuit as claimed in claim 1, wherein said threshold value generating unit (50) is included by a plurality of parallel branches
The parallel circuit constituting, each parallel branch includes resistance, and described threshold value generating unit (50) can be by optionally making
Obtain one or more of a plurality of parallel branches of described parallel circuit on or off to change described commutation threshold signal
(St) size.
4. degaussing circuit as claimed in claim 3, wherein said threshold value generating unit (50) includes：
The tie point being connected in series by first resistor (R1) and the first controlled switch (S1)；
The second branch road being connected in series by second resistance (R2) and the second controlled switch (S2)；
The 3rd branch road being connected in series by 3rd resistor (R3) and the 3rd controlled switch (S3)；
The 4th branch road being connected in series by the 4th resistance (R4) and the 4th controlled switch (S4)；
Described tie point, the second branch road, the 3rd branch road and the 4th branch circuit parallel connection connect, wherein：Described first controlled switch
(S1), the junction point of described second controlled switch (S2), described 3rd controlled switch (S3) and described 4th controlled switch (S4)
It is electrically connected at ground potential, described first resistor (R1), described second resistance (R2), described 3rd resistor (R3) and the described 4th
The junction point of resistance (R4) is electrically connected with the 5th resistance (R5), and described 5th resistance (R5) is electrically connected at first and supplies electric potential
(VS1), described commutation threshold signal (St) do not supply electric potential (V with described first for described 5th resistance (R5)S1) connect one end
Current potential；With
First controller (51), it can control described first controlled switch (S1), described second controlled switch (S2), described respectively
3rd controlled switch (S3) and described 4th controlled switch (S4) turn on and off.
5. degaussing circuit as claimed in claim 1, wherein said threshold value generating unit (50) includes the resistance of a plurality of series connection,
And described threshold value generating unit (50) can be by optionally bypassing one or more of this plurality of series resistance
Change described commutation threshold signal (St) size.
6. degaussing circuit as claimed in claim 5, wherein said threshold value generating unit (50) includes：
The 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8) and the 9th resistance (R9) being connected in series, described 9th electricity
One end that resistance (R9) is not connected with described 8th resistance (R8) can be electrically connected at ground potential；
Seventh controlled in parallel with described 7th resistance (R7) of sixth controlled switch (S6) in parallel with described 6th resistance (R6)
Switch (S7) eightth controlled switch (S8) in parallel with described 8th resistance (R8) and in parallel with described 9th resistance (R9) the
Nine controlled switch (S9)；
Tenth resistance (R10), its one end is electrically connected at one second and supplies electric potential (VS2), the other end is electrically connected at described
One end that six resistance (R6) are not electrically connected with described 7th resistance (R7), described commutation threshold signal (St) electric for the described tenth
Resistance (R10) and the current potential of described 6th resistance (R6) junction point；
Second controller (52), its control respectively described 6th controlled switch (S6), described 7th controlled switch (S7), described
Eight controlled switch (S8) and described 9th controlled switch (S9) turn on and off.
7. magnetic modulating system, including：
Degaussing circuit as described in claim 1 to 6 any one；With
One wave filter (80), its input receives described sampled voltage signal (SV), and output has filtered described sampled voltage letter
Number (SV) the middle described driving voltage (V being superimposedext) filtering voltage signal (Sf), this filtering voltage signal (Sf) institute's magnetic can be represented
The size of the electric current to be measured measured by modulating system.
8. magnetic modulating system as claimed in claim 7, wherein said magnetic modulating system includes an amplifier (82), its input
End receives described filtering voltage signal (Sf), and export described filtering voltage signal (Sf) amplified amplification voltage signal (SA).
9. magnetic modulating system as claimed in claim 7, wherein said excitation voltage source (40) can input described sampled voltage letter
Number (SV), and described driving voltage (Vext) it is described sampled voltage signal (SV) and described reversal voltage signal (Sc) sum.
10. residual current device, including：
Magnetic modulating system as claimed in claim 7；With
One processor (84), it can input described filtering voltage signal (Sf), and according to described filtering voltage signal (Sf) judge
The size of electric current to be measured in conductor.
11. residual current device as claimed in claim 10, wherein said processor (84) exportable one default in described
The threshold value of processor (84) changes signal (Sw) to described threshold value generating unit (50), described threshold value generating unit (50) is according to institute
State threshold value and change signal (Sw) control described commutation threshold signal (St) reduce in time.
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| CN107607779A (en) * | 2016-07-12 | 2018-01-19 | 上海盛相电子科技有限公司 | Electric current detecting method and device based on magnetic modulation technique |
| CN110190581B (en) * | 2019-06-04 | 2021-11-23 | 上海良信电器股份有限公司 | Residual current protection device and method of circuit breaker |
| CN113903545B (en) * | 2021-10-14 | 2023-06-06 | 杭州诺驰生命科学有限公司 | Demagnetizing device, demagnetizing system and demagnetizing method for geomagnetic shielding room |
| CN114019415B (en) * | 2022-01-06 | 2022-04-15 | 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 |
| CN117388557A (en) * | 2023-10-25 | 2024-01-12 | 上海盛位电子技术有限公司 | Current sensing device and magnetic modulation method |
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