CN209231409U - A kind of self-excitation type open loop fluxgate current sensor circuit - Google Patents
A kind of self-excitation type open loop fluxgate current sensor circuit Download PDFInfo
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- CN209231409U CN209231409U CN201821853870.3U CN201821853870U CN209231409U CN 209231409 U CN209231409 U CN 209231409U CN 201821853870 U CN201821853870 U CN 201821853870U CN 209231409 U CN209231409 U CN 209231409U
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Abstract
The utility model provides a kind of self-excitation type open loop fluxgate current sensor circuit, and self-excitation type open loop fluxgate current sensor circuit includes: positive supply；Negative supply or the reference zero of setting；Self-maintained circuit；And differential filtering amplifying circuit, the output end of the differential filtering amplifying circuit are the voltage output end of the self-excitation type open loop fluxgate current sensor circuit.The utility model is based on magnetic field detection coil voltage or current average detects, and shape amplification is filtered by the difference of doing to this voltage or electric current, final output one detects signal, the voltage of magnetic field detection coil or the voltage on current sampling resistor are the input quantity of differential filtering amplifying circuit, the utility model circuit is simple and practical, performance is good, at low cost, and consistency is good.
Description
Technical field
The utility model, which belongs to, is galvanically isolated detection and sensory field, and in particular to a kind of self-excitation type open loop magnetic flux gate current
Sensor circuit.
Background technique
Sensor is a kind of detection device, can detect the relevant information of tested equipment, be transformed into electric signal according to certain rules
Or the information output of other required forms, it is required with transmission, processing, storage, display, record and the control etc. that meet information.
Fluxgate current sensor is sensitive because of its response time fast (being smaller than 1us), good temp characteristic (being less than 100PPM)
High (uA grades) are spent, direct current and alternating current can be measured simultaneously, and measurement range is wide (mA grades~kA grades a few), in high performance electric current
Fields of measurement has consequence.Current fluxgate current sensor product is mostly using integrated fluxgate control chip as base
Plinth design, price is higher, and domestic sensor manufacturer is then substantially without similar product (mainly magnetic material and technical reason).
Utility model content
The purpose of this utility model is to provide a kind of simple and practical, low price, high performance self-excitation type open loop fluxgate
Current sensor circuit.
The utility model provides a kind of self-excitation type open loop fluxgate current sensor circuit comprising: positive supply；Negative supply
Or the reference zero of setting；Self-maintained circuit, including the first H bridge switch pipe, the 2nd H bridge switch pipe, the 3rd H bridge switch pipe,
4th H bridge switch pipe, magnetic field detection coil and current-limiting resistance；The wherein source electrode and the 2nd H bridge switch of the first H bridge switch pipe
The source electrode of pipe is connected and is connect with positive supply；The source electrode connection of the source electrode and the 4th H bridge switch pipe of 3rd H bridge switch pipe is simultaneously
The reference zero of negative supply or setting is connected to by leakage resistance of rationing the power supply；The drain electrode of first H bridge switch pipe and the 3rd H bridge switch
The drain electrode connection of pipe and tie point are the first tie point；The drain electrode of 2nd H bridge switch pipe is connected with the drain electrode of the 4th H bridge switch pipe
And tie point is the second tie point；Magnetic field detection coil is connected between the first tie point and the second tie point；First H bridge is opened
The grid of the grid and the 3rd H bridge switch pipe that close pipe links together and is connected to the second tie point；2nd H bridge switch pipe
The grid of grid and the 4th H bridge switch pipe links together and the connection of the first tie point；And differential filtering amplifying circuit, with institute
State the first tie point or magnetic field detection coil connection, self-excitation type open loop described in the output end of the differential filtering amplifying circuit
The voltage output end of fluxgate current sensor circuit.
Further, the differential filtering amplifying circuit includes operational amplifier, the first differential resistor, the second differential electrical
Resistance, third differential resistor, the 4th differential resistor, first integral capacitor and second integral capacitor；Wherein first differential resistor
It is connected between the first tie point and the reverse input end of operational amplifier, the second differential resistor and the series connection of the 4th differential resistor connect
It connects and is connected between the second tie point and the positive input of operational amplifier, third differential resistor and first integral capacitor are simultaneously
Connection is connected and is connected between the reverse input end of operational amplifier and the output end of operational amplifier, second integral capacitor one end
It is connected to the positive input of operational amplifier, the second integral capacitor other end connects the reference zero of negative supply or setting.
Further, the self-maintained circuit further includes the magnetic field detection coil electricity being connected in series with magnetic field detection coil
Sampling resistor is flowed, magnetic field detection coil and magnetic field detection coil current sampling resistor are connected in series in the first tie point and second and connect
Between contact.
Further, the differential filtering amplifying circuit includes operational amplifier, the first differential resistor, the second differential electrical
Resistance, third differential resistor, the 4th differential resistor, first integral capacitor and second integral capacitor；Wherein first differential resistor
One end is connected between magnetic field detection coil and magnetic field detection coil current sampling resistor, the first differential resistor other end and operation
The reverse input end of amplifier connects, the second differential resistor and the 4th differential resistor is connected in series and be connected to the second tie point with
Between the positive input of operational amplifier, third differential resistor and first integral capacitor are connected in parallel and are connected to operation amplifier
Between the reverse input end of device and the output end of operational amplifier, second integral capacitor one end is connected to the forward direction of operational amplifier
Input terminal, the second integral capacitor other end connect the reference zero of negative supply or setting.
Further, the first H bridge switch pipe and the 2nd H bridge switch pipe are p-type metal-oxide-semiconductor, the 3rd H bridge switch pipe and
4th H bridge switch pipe is N-type metal-oxide-semiconductor.
The utility model is based on magnetic field detection coil voltage or current average and detects, and by this voltage or electric current
Difference filter shape amplification is done, final output one detects signal, and the voltage or the voltage on current sampling resistor of magnetic field detection coil are
The input quantity of differential filtering amplifying circuit, the utility model circuit is simple and practical, and performance is good, at low cost, and consistency is good.
Detailed description of the invention
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, the utility model is given into one
Walk explanation.
Fig. 1 is that the utility model self-excitation type open loop fluxgate current sensor circuit first embodiment is flat based on coil voltage
Mean value detecting circuit；
Fig. 2 is that the utility model self-excitation type open loop fluxgate current sensor circuit second embodiment is flat based on coil current
Mean value detecting circuit.
Specific embodiment
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, attached drawing will be compareed below
Illustrate specific embodiment of the present utility model.It should be evident that the accompanying drawings in the following description is only the one of the utility model
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings, and obtains other embodiments.
To make simplified form, part relevant to the utility model is only schematically shown in each figure, they are not
Represent its practical structures as product.In addition, there is identical structure or function in some figures so that simplified form is easy to understand
The component of energy, only symbolically depicts one of those, or only marked one of those.Herein, "one" is not only
It indicates " only this ", can also indicate the situation of " more than one ".
The technical solution of the utility model is discussed in detail with specific embodiment below.
The utility model discloses a kind of self-excitation type open loop fluxgate current sensor circuit, and the utility model is really based on
The open loop fluxgate of magnetic field detection coil (being called magnetic spy head coil) self-excited oscillating type and the detection of coil voltage or current average
Current sensor circuit.
The utility model, it can be achieved that direct current or exchange are galvanically isolated detection, is belonged to based on open loop fluxgate testing principle
It is galvanically isolated detection and sensory field
It is as shown in Figure 1 the circuit of the utility model self-excitation type open loop fluxgate current sensor circuit first embodiment
Figure, dual power supply can be used in the utility model self-excitation type open loop fluxgate current sensor circuit or single supply power supply, self-excitation type are opened
Ring fluxgate current sensor circuit includes: positive supply VCC (positive supply VCC is dual power supply or single supply), negative supply (negative supply
According to the needs of design, can have or not have) or the reference zero of setting, the self-maintained circuit that is connect with positive supply with
And the differential filtering amplifying circuit being connect with self-maintained circuit, the output end self-excitation type open loop magnetic flux of differential filtering amplifying circuit
The voltage output end Vout of gate current sensor circuit.
When self-excitation type open loop fluxgate current sensor circuit is equipped with negative supply, self-maintained circuit is arranged in positive supply
Between negative supply；When self-excitation type open loop fluxgate current sensor circuit is not provided with negative supply, self-maintained circuit is set
It sets between positive supply and the reference zero of setting.
Self-maintained circuit includes the first H bridge switch pipe Q1, the 2nd H bridge switch pipe Q2, the 3rd H bridge switch pipe Q3, the 4th H
Bridge switch pipe Q4, magnetic field detection coil LS and current-limiting resistance R1.
First H bridge switch pipe Q1, the 2nd H bridge switch pipe Q2, the 3rd H bridge switch pipe Q3, the 4th H bridge switch pipe Q4, magnetic field
Detection coil LS, current-limiting resistance R1 and differential filtering amplifying circuit, differential filtering amplifying circuit export the voltage of this circuit
Vout。
Wherein, the first H bridge switch pipe Q1 and the 2nd H bridge switch pipe Q2 is p-type metal-oxide-semiconductor, the 3rd H bridge switch pipe Q3 and the 4th
H bridge switch pipe Q4 is N-type metal-oxide-semiconductor；Magnetic field detection coil LS is a satiable inductor, and the magnetic material of coil inside is usually by those
The magnetic material composition of high initial magnetoconductivity, low saturation induction density, the satiable inductor refer to when the electricity in inductance
When stream is greater than a certain threshold values, inductance can be reduced rapidly, and electric current meeting rapid increase is expressed as inductance saturation.
First H bridge switch pipe Q1, the 2nd H bridge switch pipe Q2, the 3rd H bridge switch pipe Q3, the 4th H bridge switch pipe Q4, magnetic field
Detection coil LS and current-limiting resistance R1 forms self-maintained circuit.
Differential filtering amplifying circuit includes that operational amplifier U1, the first differential resistor R3, the second differential resistor R4, third are poor
Sub-resistance R5, the 4th differential resistor R6, first integral capacitor C1 and second integral capacitor C2, the operation of differential filtering amplifying circuit
The output end of amplifier U1 exports the voltage end Vout of this circuit.
In self-maintained circuit: the source electrode connection of the source electrode and the 2nd H bridge switch pipe Q2 of the first H bridge switch pipe Q1 is simultaneously equal
It is connect with positive supply VCC；The source electrode of 3rd H bridge switch pipe Q3 and the source electrode of the 4th H bridge switch pipe Q4 connect and by rationing the power supply
Leakage resistance R1 is connected to the reference zero of negative supply or setting；The drain electrode of first H bridge switch pipe Q1 is with the 3rd H bridge switch pipe Q3's
Drain electrode connection (tie point is A point shown in FIG. 1, i.e. the first tie point)；The drain electrode of 2nd H bridge switch pipe Q2 and the 4th H bridge are opened
Close the drain electrode connection of pipe Q4 (tie point is B point shown in FIG. 1, i.e. the second tie point)；Magnetic field detection coil LS is connected to the first H
The tie point of the drain electrode of the drain electrode and the 3rd H bridge switch pipe Q3 of bridge switch pipe Q1 and drain electrode and the 4th H of the 2nd H bridge switch pipe Q2
(i.e. magnetic field detection coil LS is connected between A point and B point, is implemented shown in Fig. 1 between the tie point of the drain electrode of bridge switch pipe Q4
Example)；The grid of first H bridge switch pipe Q1 and the grid of the 3rd H bridge switch pipe Q3 link together and with the second tie point (i.e. B
Point) connection (can directly be connected to, can also be connected to by resistance)；The grid of 2nd H bridge switch pipe Q2 and the 4th H bridge switch pipe Q4's
Grid links together and the first tie point (i.e. A point) connection (can directly be connected to, can also be connected to by resistance).
In differential filtering amplifying circuit, the first differential resistor R3 is connected to the first tie point (i.e. A point) and operation amplifier
Between the reverse input end of device U1, the second differential resistor R4 and the 4th differential resistor R6 are connected in series and are connected to the second tie point
Between (i.e. B point) and the positive input of operational amplifier U1, third differential resistor R5 and first integral capacitor C1 are connected in parallel
And it is connected between the reverse input end of operational amplifier U1 and the output end of operational amplifier U1, the one end second integral capacitor C2
It is connected to the positive input of operational amplifier U1, the second integral capacitor C2 other end connects the reference zero of negative supply or setting
Point.
It is illustrated in figure 2 the circuit of the utility model self-excitation type open loop fluxgate current sensor circuit second embodiment
Figure, second embodiment is with the difference of above-mentioned first embodiment: self-maintained circuit further includes connecting with magnetic field detection coil LS
Magnetic field detection coil current the sampling resistor R2, magnetic field detection coil LS and magnetic field detection coil current sampling resistor R2 of connection go here and there
Connection is connected between the first tie point (i.e. A point) and the second tie point (i.e. B point).
The difference of second embodiment and above-mentioned first embodiment is: the first differential resistor R3 of differential filtering amplifying circuit
One end be connected to magnetic field detection coil LS and magnetic field detection coil current sampling resistor R2 between, the first differential resistor R3 is another
End is connect with the reverse input end of operational amplifier U1.
The utility model also provides a kind of self-oscillation method of self-excitation type open loop fluxgate current sensor circuit, including
Following steps:
When just powering on, the first H bridge switch pipe Q1, the 2nd H bridge switch pipe Q2, the 3rd H bridge switch pipe Q3 and the 4th H bridge
Switching tube Q4 can because of the not quite identical property of device parameters, certainly will will cause one of H bridge switch pipe preferentially open (
Differential resistor R3, R4, R5, R6 of subsequent amplification circuitry can accelerate this opening process in Fig. 1 and Fig. 2)；
Step 1: when being powered, it is assumed that the first H bridge switch pipe Q1 first open (when being initially powered, the first H bridge switch pipe Q1, the
Two H bridge switch pipe Q2, the 3rd H bridge switch pipe Q3 and the 4th H bridge switch pipe Q4 can be bound to because of the not quite identical property of device parameters
Will cause one of H bridge switch pipe preferentially open (in Fig. 1 differential resistor R3, R4 of differential filtering amplifying circuit, R5,
R6 can accelerate this opening process)), when the first H bridge switch pipe Q1 is opened, the first tie point (i.e. A point) is high level；
Step 2: the high level of the first tie point (i.e. A point) is added to the grid of the 2nd H bridge switch pipe Q2 and the 4th H bridge is opened
On the grid for closing pipe Q4, keeps the 2nd H bridge switch pipe Q2 shutdown and the 4th H bridge switch pipe Q4 open-minded, make the second tie point (i.e. B
Point) it is low level；
Step 3: the low level of the second tie point (i.e. B point) acts on the grid and the 3rd H bridge of the first H bridge switch pipe Q1
The grid of switching tube Q3 is opened the first H bridge switch pipe Q1 and is turned off with the 3rd H bridge switch pipe Q3, namely establishes first at this time
Tie point (i.e. A point) is high level, the second tie point (i.e. B point) is low level circuit state；
Step 4: the first tie point (i.e. A point) established is high level and the second tie point (i.e. B point) is low level electricity
Pressure can be added on magnetic field detection coil LS (or on magnetic field detection coil LS and magnetic field detection coil current sampling resistor R2), due to
Magnetic field detection coil LS is an inductance element, and electric current cannot be mutated, therefore the first tie point (i.e. A point) and the second tie point (i.e. B
Point) on voltage can make the electric current on magnetic field detection coil LS constantly increase (define at this time from the first tie point (i.e. A point) to
The electric current of second tie point (i.e. B point) is positive current), this electric current can flow through current-limiting resistance R1, make the voltage on current-limiting resistance R1
Also it is continuously increased, is also constantly increased so as to cause the second tie point (i.e. B point) voltage；
Step 5: magnetic field detection coil LS inductance is full when the electric current on magnetic field detection coil LS is greater than a certain threshold values
With, electric current rises rapidly, voltage and the second tie point (i.e. B point) voltage on current-limiting resistance R1 also and then rise rapidly；
Step 6: when the second tie point (i.e. B point) voltage is greater than a certain threshold values, the 3rd H bridge switch pipe Q3 conducting and the
It is low level that one H bridge switch pipe Q1, which turns off the first tie point (i.e. A point), this low-voltage acts on the grid of the 2nd H bridge switch pipe Q2
The grid of pole and the 4th H bridge switch pipe Q4 makes the 2nd H bridge switch pipe Q2 conducting and the 4th H bridge switch pipe Q4 shutdown, and second connects
Contact (i.e. B point) is high level, namely establishing the first tie point (i.e. A point) at this time is low level, the second tie point (i.e. B point)
For the circuit state of high level；At this moment the first tie point (i.e. A point) is low level and the second tie point (i.e. B point) is high level
Voltage can be added on magnetic field detection coil LS (or on magnetic field detection coil LS and magnetic field detection coil current sampling resistor R2), by
It is an inductance element in magnetic field detection coil LS, electric current cannot be mutated, therefore the second tie point (i.e. B point) and the first tie point
Voltage on (i.e. A point) can be such that the electric current opposite direction on magnetic field detection coil LS constantly increases (to be defined at this time from the second tie point
The electric current of (i.e. B point) to the first tie point (i.e. A point) is negative current), this electric current can flow through current-limiting resistance R1, make current-limiting resistance R1
On voltage be also continuously increased, also constantly increased so as to cause the first tie point (i.e. A point) voltage；
Step 7: magnetic field detection coil LS inductance is full when the electric current on magnetic field detection coil LS is greater than a certain threshold values
With, electric current rises rapidly, voltage and the first tie point (i.e. A point) voltage on current-limiting resistance R1 also and then rise rapidly；
Step 8: when the first tie point (i.e. A point) voltage is greater than a certain threshold values, the 4th H bridge switch pipe Q4 conducting and the
Two H bridge switch pipe Q2 shutdown, the second tie point (i.e. B point) are low level, this low-voltage acts on the grid of the first H bridge switch pipe Q1
The grid of pole and the 3rd H bridge switch pipe Q3 makes the first H bridge switch pipe Q1 conducting and the 3rd H bridge switch pipe Q3 shutdown, the first connection
Point (i.e. A point) is high level, namely establishing the first tie point (i.e. A point) at this time is high level, and the second tie point (i.e. B point) is
Low level circuit state.
The utility model by so constantly vibrating repeatedly, frequency of oscillation and supply voltage, magnetic field detection coil LS
The relating to parameters of inductance, current-limiting resistance R1, magnetic field detection coil current sampling resistor R2.
Circle number magnetic field detection coil LS appropriate by the suitable magnetic material of selection and coiling, while designing suitable current limliting electricity
The parameter for hindering R1 and magnetic field detection coil current sampling resistor R2, makes magnetic field detection coil LS work in positive counter magnetic field saturation state
(referred to as fluxgate), the positive antisymmetry of fluxgate under normal circumstances, under no external magnetic fields, magnetic field detection coil LS two
The operating voltage at end or its operating current average value be zero namely magnetic field detection coil current sampling resistor R2 on voltage be averaged
Value is zero.
Since the fluxgate of the utility model is that (the utility model circuit diagram is operable with dual power supply or list for single supply work
Power supply, but its oscillating circuit is single supply work), symmetry is not influenced by power supply, and (fluxgate to work than dual power supply has
Better symmetry), to guarantee that circuit has high sensitivity and detection accuracy.
When there is external magnetic fields (magnetic field that current sensor is usually primary current), the positive skew-symmetry of fluxgate
It can be broken, its operating voltage (the first tie point (i.e. A point) subtracts the voltage on the second tie point (i.e. B point)) is average at this time
Value or current average be not zero namely magnetic field detection coil current sampling resistor R2 on average voltage be not zero, this electricity
Pressure is directly exported by after the amplification of subsequent differential filtering amplifying circuit.
The utility model is based on magnetic field detection coil voltage or current average and detects, and by this voltage or electric current
Difference filter shape amplification is done, final output one detects signal, the voltage or the electricity on current sampling resistor R2 of magnetic field detection coil LS
Pressure is the input quantity of differential filtering amplifying circuit, and the utility model circuit is simple and practical, and performance is good, and at low cost, consistency is good.
The utility model has split a kind of open loop magnetic flux gate control circuit different from integrating fluxgate control chip, this reality
Simple and practical with new-type circuit, price is low, and performance is high, because fluxgate is that open loop works, therefore can be influenced by fluxgate is magnetically saturated,
Usually measurable milliampere grade is to the electric current of several hundred peace grades, and in certain current range, output is directly proportional to output electric current.
It should be noted that above-described embodiment can be freely combined as needed.The above is only the utility model
Preferred embodiment, the detail during however, the present invention is not limited to the foregoing embodiments, it is noted that for this skill
For the those of ordinary skill in art field, in the range of the technology design of the utility model, the utility model principle is not being departed from
Under the premise of, several improvements and modifications can also be made, a variety of equivalents are carried out to the technical solution of the utility model, these
It improves, retouching and equivalents also should be regarded as the protection scope of the utility model.
Claims (5)
1. a kind of self-excitation type open loop fluxgate current sensor circuit, characterized in that it comprises:
Positive supply；
Negative supply or the reference zero of setting；
Self-maintained circuit, including the first H bridge switch pipe, the 2nd H bridge switch pipe, the 3rd H bridge switch pipe, the 4th H bridge switch pipe,
Magnetic field detection coil and current-limiting resistance；Wherein the source electrode of the source electrode of the first H bridge switch pipe and the 2nd H bridge switch pipe connects simultaneously
It is connect with positive supply；The source electrode of 3rd H bridge switch pipe and the source electrode of the 4th H bridge switch pipe connect and pass through leakage resistance of rationing the power supply
It is connected to the reference zero of negative supply or setting；The drain electrode of first H bridge switch pipe connects and connects with the drain electrode of the 3rd H bridge switch pipe
Contact is the first tie point；The drain electrode of 2nd H bridge switch pipe is connected with the drain electrode of the 4th H bridge switch pipe and tie point is the second company
Contact；Magnetic field detection coil is connected between the first tie point and the second tie point；The grid and the 3rd H of first H bridge switch pipe
The grid of bridge switch pipe links together and is connected to the second tie point；The grid and the 4th H bridge switch pipe of 2nd H bridge switch pipe
Grid link together and be connected to the first tie point；And
Differential filtering amplifying circuit is connect with first tie point or the magnetic field detection coil, the differential filtering amplification
The output end of circuit is the voltage output end of the self-excitation type open loop fluxgate current sensor circuit.
2. self-excitation type open loop fluxgate current sensor circuit according to claim 1, it is characterised in that: the difference filter
Wave amplifying circuit include operational amplifier, the first differential resistor, the second differential resistor, third differential resistor, the 4th differential resistor,
First integral capacitor and second integral capacitor；Wherein first differential resistor is connected to the first tie point and operational amplifier
Between reverse input end, the second differential resistor and the 4th differential resistor are connected in series and are connected to the second tie point and operation amplifier
Between the positive input of device, third differential resistor and first integral capacitor are connected in parallel and are connected to the reversed of operational amplifier
Between input terminal and the output end of operational amplifier, second integral capacitor one end is connected to the positive input of operational amplifier,
The second integral capacitor other end connects the reference zero of negative supply or setting.
3. self-excitation type open loop fluxgate current sensor circuit according to claim 1, it is characterised in that: described from exciting
Swinging circuit further includes the magnetic field detection coil current sampling resistor being connected in series with magnetic field detection coil, magnetic field detection coil and magnetic
Field detecting coil current sampling resistor is connected in series between the first tie point and the second tie point.
4. self-excitation type open loop fluxgate current sensor circuit according to claim 3, it is characterised in that: the difference filter
Wave amplifying circuit include operational amplifier, the first differential resistor, the second differential resistor, third differential resistor, the 4th differential resistor,
First integral capacitor and second integral capacitor；Wherein first differential resistor one end is connected to magnetic field detection coil and magnetic field inspection
Between test coil current sampling resistor, the reverse input end of the first differential resistor other end and operational amplifier is connected, and second is poor
Sub-resistance and the 4th differential resistor are connected in series and are connected between the second tie point and the positive input of operational amplifier, the
Three differential resistors and first integral capacitor are connected in parallel and are connected to the reverse input end and operational amplifier of operational amplifier
Between output end, second integral capacitor one end is connected to the positive input of operational amplifier, and the second integral capacitor other end connects
Connect the reference zero of negative supply or setting.
5. self-excitation type open loop fluxgate current sensor circuit according to claim 1 to 4, it is characterised in that: described
First H bridge switch pipe and the 2nd H bridge switch pipe are p-type metal-oxide-semiconductor, and the 3rd H bridge switch pipe and the 4th H bridge switch pipe are N-type MOS
Pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821853870.3U CN209231409U (en) | 2018-11-12 | 2018-11-12 | A kind of self-excitation type open loop fluxgate current sensor circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821853870.3U CN209231409U (en) | 2018-11-12 | 2018-11-12 | A kind of self-excitation type open loop fluxgate current sensor circuit |
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| CN209231409U true CN209231409U (en) | 2019-08-09 |
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|---|---|---|---|
| CN201821853870.3U Withdrawn - After Issue CN209231409U (en) | 2018-11-12 | 2018-11-12 | A kind of self-excitation type open loop fluxgate current sensor circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270325A (en) * | 2018-11-12 | 2019-01-25 | 深圳市艾华迪技术有限公司 | A kind of self-excitation type open loop fluxgate current sensor circuit and its self-oscillation method |
| CN112462258A (en) * | 2020-11-06 | 2021-03-09 | 珠海格力电器股份有限公司 | Motor terminal voltage detection method, device and circuit and air conditioning system |
| CN116539949A (en) * | 2023-07-04 | 2023-08-04 | 杰华特微电子股份有限公司 | Current detection device, detection method and switching circuit of H-bridge circuit |
-
2018
- 2018-11-12 CN CN201821853870.3U patent/CN209231409U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270325A (en) * | 2018-11-12 | 2019-01-25 | 深圳市艾华迪技术有限公司 | A kind of self-excitation type open loop fluxgate current sensor circuit and its self-oscillation method |
| CN109270325B (en) * | 2018-11-12 | 2024-05-24 | 深圳市艾华迪技术有限公司 | Self-excitation type open-loop fluxgate current sensor circuit and self-excitation oscillation method thereof |
| CN112462258A (en) * | 2020-11-06 | 2021-03-09 | 珠海格力电器股份有限公司 | Motor terminal voltage detection method, device and circuit and air conditioning system |
| CN116539949A (en) * | 2023-07-04 | 2023-08-04 | 杰华特微电子股份有限公司 | Current detection device, detection method and switching circuit of H-bridge circuit |
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