CN210109295U - Proportional-integral circuit for identifying convex wave - Google Patents
Proportional-integral circuit for identifying convex wave Download PDFInfo
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- CN210109295U CN210109295U CN201920876577.7U CN201920876577U CN210109295U CN 210109295 U CN210109295 U CN 210109295U CN 201920876577 U CN201920876577 U CN 201920876577U CN 210109295 U CN210109295 U CN 210109295U
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Abstract
The utility model discloses a distinguish proportion integral circuit of convex wave, the input parameter-electric current of this circuit comes from the main circuit, main circuit comprises a full-bridge circuit and one-end circuit, and wherein, this proportion integral circuit comprises a subtraction circuit and a secondary integral circuit. Has the advantages that: the utility model discloses an utilize main circuit and singlechip directly to calculate magnetic material's saturation current to calculate magnetic material's Bs and Br, in addition, this circuit except can be used for testing magnetic core material, can also be used on having the measurement of the relevant circuit parameter of electric current sudden change in arbitrary circuit, consequently, the application is extremely extensive.
Description
Technical Field
The utility model relates to an electron field particularly, relates to a differentiate proportional-plus-integral circuit of convex wave.
Background
With the rapid development of electronic technology, the use of magnetic materials is increasingly widespread, however, no tester capable of directly measuring the saturation magnetic flux density Bs and the remanence Br of the magnetic core material is found in the market, mainly because the magnetizing current on the corresponding coil of the magnetic core is increased sharply (the current waveform is sharp) when the magnetic core is saturated, and the characteristic can be clearly observed on an oscilloscope, but the characteristic is difficult to be discriminated or read by a single chip microcomputer or a DSP device.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
To the problem among the correlation technique, the utility model provides an distinguish proportional-integral circuit and method of convex wave, it can utilize correlation circuit and singlechip direct computation magnetic material's saturation current to calculate magnetic material's Bs and Br, and also obtained very high accuracy measuring result in popularizing this good measuring method to other circuit measurements that have the electric current sudden change, in order to overcome the above-mentioned technical problem that prior art exists.
The technical scheme of the utility model is realized like this:
according to an aspect of the present invention, there is provided a proportional-integral circuit for discriminating a convex wave, wherein an input parameter of the circuit, i.e., a current, is derived from a main circuit composed of a full-bridge circuit for bidirectional magnetization of a magnetic core and a single-end circuit for unidirectional magnetization of the magnetic core.
The proportional integrating circuit is composed of a subtracting circuit and a secondary integrating circuit.
Further, the subtraction circuit includes a power supply, a resistor R1, a resistor R3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a variable resistor VR3, an operational amplifier U5A, and an operational amplifier U4A, wherein one end of the resistor R1 IS connected to one end of the original current IS, the other end of the resistor R1 IS connected to the second pin of the operational amplifier U5A, one end of the resistor R9, and one end of the capacitor C5, the first pin of the operational amplifier U5A IS connected to the other end of the resistor R9, the other end of the capacitor C5, one end of the resistor R10, and one end of the capacitor C6, the third pin of the operational amplifier U5A IS connected to one end of the resistor R3, the eighth pin VCC of the operational amplifier U5A IS connected to the positive terminal VCC of the power supply, and the other end of the resistor R10 IS connected to one end of the resistor R11, The one end of electric capacity C8 the second pin of operational amplifier U4A with the one end of electric capacity C7 is connected, the first pin of operational amplifier U4A respectively with the other end of electric capacity C8 the one end of resistance R12 the one end of variable resistance VR3 is connected, just the other end and the variable end of variable resistance VR3 all with the other end of resistance R11 is connected, the third pin of operational amplifier U4A respectively with the other end of electric capacity C7, the other end of electric capacity C6 and the other end of resistance R3 are connected and ground connection, the eighth pin of operational amplifier U4A is connected with the positive pole VCC of power, the other end and the first current output end ISP of resistance R12 are connected.
Further, the second integrating circuit includes a power supply, a resistor R2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a variable resistor VR2, an operational amplifier U5B, and an operational amplifier U4B, one end of the resistor R2 IS connected to one end of the original current IS, the other end of the resistor R2 IS connected to a sixth pin of the operational amplifier U5B, one end of the resistor R5, and one end of the capacitor C1, a seventh pin of the operational amplifier U5B IS connected to the other end of the resistor R5, the other end of the capacitor C1, one end of the resistor R6, and one end of the capacitor C2, a fifth pin of the operational amplifier U5B IS grounded, an eighth pin of the operational amplifier U5B IS connected to the positive electrode VCC of the power supply, and the other end of the resistor R6 IS connected to one end of the resistor R7, The one end of electric capacity C4 the sixth pin of operational amplifier U4B with the one end of electric capacity C3 is connected, the seventh pin of operational amplifier U4B respectively with the other end of electric capacity C4 the one end of resistance R8 with the one end of variable resistance VR2 is connected, just the other end and the variable end of variable resistance VR2 all with the one end of resistance R7 is connected, the fifth pin of operational amplifier U4B respectively with the other end of electric capacity C3 and the other end of electric capacity C2 are connected and ground connection, the eighth pin of operational amplifier U4B is connected with the positive pole VCC of power supply, the other end and the second current output end ISB of resistance R8 are connected.
Furthermore, the subtraction circuit and the second-order integrating circuit are connected through a resistor R4 and a variable resistor VR1, one end of the resistor R4 is connected to one end of the resistor R3 and the third pin of the operational amplifier U5A, respectively, the other end of the resistor R4 is connected to one end of the variable resistor VR1, and the other end and the variable end of the variable resistor VR1 are connected to the other end of the capacitor C4, the seventh pin of the operational amplifier U4B, one end of the resistor R8, and one end of the variable resistor VR2, respectively.
Further, the operational amplifiers U5B and U4B are used for performing two integration operations on the collected current signal, and the operational amplifiers U5A and U4A are used for performing a subtraction operation on the collected current signal and the output signal of the U4B multiplied by a coefficient smaller than 1, and then performing two integration operations on the difference.
The utility model has the advantages that:
the utility model discloses an utilize main circuit and singlechip directly to calculate magnetic material's saturation current to calculate magnetic material's Bs and Br, in addition, this circuit except can be used for testing magnetic core material, can also be used on having the measurement of the relevant circuit parameter of electric current sudden change in arbitrary circuit, consequently, the application is extremely extensive.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a proportional-integral circuit for discriminating a convex wave according to an embodiment of the present invention.
Fig. 2 is a flowchart of a measurement method for discriminating a convex wave proportional-integral circuit according to an embodiment of the present invention.
Detailed Description
For further explanation of the embodiments, the drawings are provided as part of the disclosure and serve primarily to illustrate the embodiments and, together with the description, to explain the principles of operation of the embodiments, and to provide further explanation of the invention and advantages thereof, it will be understood by those skilled in the art that various other embodiments and advantages of the invention are possible, and that elements in the drawings are not to scale and that like reference numerals are generally used to designate like elements.
According to an embodiment of the present invention, there is provided a proportional-integral circuit for discriminating a convex wave, as shown in fig. 1, an input parameter of the circuit, i.e., a current, is derived from a main circuit, which is composed of a full-bridge circuit for bi-directionally magnetizing a magnetic core and a single-end circuit for unidirectional magnetizing the magnetic core.
The proportional integrating circuit is composed of a subtracting circuit and a secondary integrating circuit.
In one embodiment, the subtraction circuit includes a power supply, a resistor R1, a resistor R3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a variable resistor VR3, an operational amplifier U5A, and an operational amplifier U4A, wherein one end of the resistor R1 IS connected to one end of a source current IS, the other end of the resistor R1 IS connected to the second pin of the operational amplifier U5A, one end of the resistor R9, and one end of the capacitor C5, the first pin of the operational amplifier U5A IS connected to the other end of the resistor R9, the other end of the capacitor C5, one end of the resistor R10, and one end of the capacitor C6, the third pin of the operational amplifier U5A IS connected to one end of the resistor R3, the eighth pin VCC of the operational amplifier U5A IS connected to the positive terminal VCC of the power supply, and one end of the resistor R11 IS connected to one end of the other end of the resistor R10, The one end of electric capacity C8 the second pin of operational amplifier U4A with the one end of electric capacity C7 is connected, the first pin of operational amplifier U4A respectively with the other end of electric capacity C8 the one end of resistance R12 the one end of variable resistance VR3 is connected, just the other end and the variable end of variable resistance VR3 all with the other end of resistance R11 is connected, the third pin of operational amplifier U4A respectively with the other end of electric capacity C7, the other end of electric capacity C6 and the other end of resistance R3 are connected and ground connection, the eighth pin of operational amplifier U4A is connected with the positive pole VCC of power, the other end and the first current output end ISP of resistance R12 are connected.
In one embodiment, the second integrating circuit includes a power supply, a resistor R2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a variable resistor VR2, an operational amplifier U5B, and an operational amplifier U4B, one end of the resistor R2 IS connected to one end of the original current IS, the other end of the resistor R2 IS connected to a sixth pin of the operational amplifier U5B, one end of the resistor R5, and one end of the capacitor C1, a seventh pin of the operational amplifier U5B IS connected to the other end of the resistor R5, the other end of the capacitor C1, one end of the resistor R6, and one end of the capacitor C2, a fifth pin of the operational amplifier U5B IS grounded, an eighth pin of the operational amplifier U5B IS connected to the positive electrode VCC of the power supply, and the other end of the resistor R6 IS connected to one end of the resistor R7, The one end of electric capacity C4 the sixth pin of operational amplifier U4B with the one end of electric capacity C3 is connected, the seventh pin of operational amplifier U4B respectively with the other end of electric capacity C4 the one end of resistance R8 with the one end of variable resistance VR2 is connected, just the other end and the variable end of variable resistance VR2 all with the one end of resistance R7 is connected, the fifth pin of operational amplifier U4B respectively with the other end of electric capacity C3 and the other end of electric capacity C2 are connected and ground connection, the eighth pin of operational amplifier U4B is connected with the positive pole VCC of power supply, the other end and the second current output end ISB of resistance R8 are connected.
In one embodiment, the subtraction circuit and the second-order integrating circuit are connected through a resistor R4 and a variable resistor VR1, one end of the resistor R4 is connected to one end of the resistor R3 and the third pin of the operational amplifier U5A, respectively, the other end of the resistor R4 is connected to one end of the variable resistor VR1, and the other end and the variable end of the variable resistor VR1 are connected to the other end of the capacitor C4, the seventh pin of the operational amplifier U4B, one end of the resistor R8, and one end of the variable resistor VR2, respectively.
In one embodiment, the operational amplifiers U5B and U4B are configured to perform two integration operations on the collected current signal, the operational amplifiers U5A and U4A are configured to perform a subtraction operation on the collected current signal and the output signal of the U4B multiplied by a coefficient smaller than 1, and then perform two integration operations on the difference between the collected current signal and the output signal of the U4B, so that whether the original current IS spikes or whether the current magnitude changes suddenly can be known by comparing the magnitudes of the first current output terminal ISP and the second current output terminal ISB.
Wherein, the utility model discloses a core lies in, changes the voltage signal into current signal, when the magnetic core does not have the saturation (also when the range of change of electric current has not reached the critical point of electric current sudden change yet), the current waveform that flows around the coil of magnetic core is triangle-shaped, and under this condition, we know, the new triangle-shaped that half of triangle-shaped length of side is constituteed, and its area is the fourth of original triangle-shaped area. Maintaining this proportionality coefficient, the area relationship of the two triangles is always true when the core is not saturated. However, when the magnetic core is saturated, the current waveform is sharp, and the area relationship of the two triangles is no longer true, so that it is possible to identify whether the magnetic core is in a saturated state, and read the current magnitude, the voltage magnitude and Ton at this critical point.
According to another aspect of the present invention, there is provided a measuring method for identifying a convex wave proportional-integral circuit, as shown in fig. 2, comprising the following steps:
s101, winding a plurality of conductive coils on a magnetic material to be tested, and connecting the conductive coils into a main test circuit;
s102, controlling a corresponding relay in a circuit through a single chip microcomputer, and enabling a magnetic core coil to be sequentially connected into a full-bridge circuit and a single-ended circuit;
step S103, respectively adjusting the output voltage of the full-bridge or single-ended circuit and the inversion Ton time step by step through the single chip microcomputer, and recording the Ton and U when the current is sharp;
step S104, calculating the maximum saturation magnetic flux density Bs and the residual magnetic flux density Br of the magnetic core according to a preset method;
step S105, calculating the initial permeability and the effective permeability of the magnetic core according to the corresponding values obtained in different time periods in the preset method.
The magnetic material to be detected can be magnetic materials such as a magnetic ring and the like, and the number of winding turns of the conductive coil is 5.
The preset method comprises the following steps: according to the induced electromotive force formula of the magnetic core:
obtained from (1):
obviously, the maximum change amount of the magnetic flux density in each cycle can be obtained from the equation (2), and assuming that Δ B corresponds to Δ B1 in the full-bridge circuit and Δ B corresponds to Δ B2 in the half-bridge circuit, and the saturation magnetic flux density and the residual magnetic flux density of the core are Bs and Br, respectively, then:
ΔB1＝Bs+Br (3)
ΔB2＝Bs-Br (4)
thereby obtaining the maximum saturation magnetic flux density Bs and the residual magnetic flux density Br of the magnetic core;
wherein, in the above formula: u is the input voltage, i.e. the dc voltage across the core coil through a half bridge or a full bridge; n is the number of turns of the core coil, Δ Φ is the amount of change in magnetic flux through the coil in Δ t time, the cross-sectional area of the S core, Δ B is the amount of change in magnetic flux density in Ton time, Ton is the on-time of the switching tube in one or half cycle, Δ H is the heat of reaction generated in Ton time, and H is the magnetic field strength.
Specifically, the corresponding numerical values are respectively corresponding Δ B, Δ H, and H values obtained at different time periods. Wherein, the magnetic permeability is obtained by the formula μ ═ B/H, where H ═ magnetic field strength, B ═ magnetic induction strength, and commonly indicated by the symbol μ, μ is the magnetic permeability of the medium, or called absolute magnetic permeability,
initialMagnetic permeability μ i: the magnetic permeability of the basic magnetization curve when H → 0, effective magnetic permeability μ r: in forming a closed magnetic circuit with the inductor L (leakage flux is negligible), the effective permeability of the core is:
wherein, L is the self-inductance (mH) of the winding, W is the winding turns, Lm is the magnetic path length, and Ae is the magnetic core sectional area.
In conclusion, with the aid of the technical solution of the present invention, the saturation current of the magnetic material is directly calculated by using the main circuit and the single chip, so as to calculate Bs and Br of the magnetic material, and besides, the circuit can be used for testing the magnetic core material, and can also be used for measuring the related circuit parameters with physical quantity mutation in any circuit, so that the application field is extremely wide.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A proportional-integral circuit for discriminating convex waves is characterized in that the input parameter of the circuit, namely current, comes from a main circuit, the main circuit consists of a full-bridge circuit for bidirectionally magnetizing a magnetic core and a single-end circuit for unidirectionally magnetizing the magnetic core, and the proportional-integral circuit consists of a subtraction circuit and a secondary-integral circuit.
2. The proportional-integral circuit for discriminating a convex wave according to claim 1, wherein the subtracting circuit comprises a power supply, a resistor R1, a resistor R3, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a variable resistor VR3, an operational amplifier U5A, and an operational amplifier U4A, wherein one end of the resistor R1 IS connected to one end of the original current IS, the other end of the resistor R1 IS connected to the second pin of the operational amplifier U5A, one end of the resistor R9, and one end of the capacitor C5, respectively, the first pin of the operational amplifier U5A IS connected to the other end of the resistor R9, the other end of the capacitor C5, one end of the resistor R10, and one end of the capacitor C10, the third pin of the operational amplifier U5 10 IS connected to one end of the resistor R10, and the positive terminal of the operational amplifier U10, the other end of the resistor R10 is connected with one end of the resistor R11, one end of the capacitor C8, a second pin of the operational amplifier U4A and one end of the capacitor C7, a first pin of the operational amplifier U4A is connected with the other end of the capacitor C8, one end of the resistor R12 and one end of the variable resistor VR3, the other end of the variable resistor VR3 and the variable end are both connected with the other end of the resistor R11, a third pin of the operational amplifier U4A is connected with the other end of the capacitor C7, the other end of the capacitor C6 and the other end of the resistor R3, and is grounded, an eighth pin of the operational amplifier U4A is connected with an anode VCC of a power supply, and the other end of the resistor R12 is connected with a first current output end ISP.
3. The proportional-integral circuit for discriminating a convex wave according to claim 2, wherein the second-order integrating circuit comprises a power supply, a resistor R2, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a variable resistor VR2, an operational amplifier U5B and an operational amplifier U4B, one end of the resistor R2 IS connected to one end of the original current IS, the other end of the resistor R2 IS connected to a sixth pin of the operational amplifier U5B, one end of the resistor R5 and one end of the capacitor C1, a seventh pin of the operational amplifier U5B IS connected to the other end of the resistor R5, the other end of the capacitor C1, one end of the resistor R6 and one end of the capacitor C2, a fifth pin of the operational amplifier U5B IS grounded, and an eighth pin of the operational amplifier U5B IS connected to the positive terminal VCC of the power supply, the other end of the resistor R6 is connected to one end of the resistor R7, one end of the capacitor C4, the sixth pin of the operational amplifier U4B and one end of the capacitor C3, the seventh pin of the operational amplifier U4B is connected to the other end of the capacitor C4, one end of the resistor R8 and one end of the variable resistor VR2, the other end of the variable resistor VR2 and the variable end of the variable resistor VR are both connected to one end of the resistor R7, the fifth pin of the operational amplifier U4B is connected to the other end of the capacitor C3 and the other end of the capacitor C2 and grounded, the eighth pin of the operational amplifier U4B is connected to the positive terminal of the power supply, and the other end of the resistor R8 is connected to the second current output end ISB.
4. The proportional-integral circuit for discriminating convex waves of claim 3, wherein the subtracting circuit and the second integrating circuit are connected through a resistor R4 and a variable resistor VR1, one end of the resistor R4 is connected to one end of the resistor R3 and the third pin of the operational amplifier U5A, respectively, the other end of the resistor R4 is connected to one end of the variable resistor VR1, and the other end and the variable end of the variable resistor VR1 are connected to the other end of the capacitor C4, the seventh pin of the operational amplifier U4B, one end of the resistor R8 and one end of the variable resistor VR2, respectively.
5. The proportional-integral circuit for discriminating convex waves of claim 4, wherein the operational amplifiers U5B and U4B are used for performing two integration operations on the collected current signal, and the operational amplifiers U5A and U4A are used for performing two integration operations on the difference between the collected current signal and the output signal of the U4B after the difference is subtracted by multiplying a coefficient smaller than 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110068779A (en) * | 2019-06-12 | 2019-07-30 | 邢台子中电子科技有限公司 | A kind of proportional integral circuit and method identifying convex wave |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110068779A (en) * | 2019-06-12 | 2019-07-30 | 邢台子中电子科技有限公司 | A kind of proportional integral circuit and method identifying convex wave |
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