CN214622830U

CN214622830U - Magnetic powder core alternating current-direct current superposition tester

Info

Publication number: CN214622830U
Application number: CN202120438843.5U
Authority: CN
Inventors: 应俊; 江宏晖; 罗建桥
Original assignee: Sichuan Dongge Technology Co ltd
Current assignee: Sichuan Dongge Technology Co ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-11-05
Anticipated expiration: 2031-03-01

Abstract

The utility model discloses a magnetic powder core alternating current-direct current stack tester, including casing and the test circuit of setting in the casing inside, test circuit includes direct current return circuit and the alternating current return circuit that connects through a set of transformer, and the transformer includes inductance L1~ L3. The utility model discloses an alternating current return circuit and direct current return circuit only connect through a set of transformer, compare in two sets of transformers in the conventional art, the access quantity of transformer has been reduced, the energy consumption has been reduced, and avoid the drawback of unable each magnetic core upper voltage of confirming in the test, the direct turn ratio through the control inductance of this application can be with the voltage on the each inductance of better control, make can reduce the friendship, the mutual interference of direct current signal to DC power supply and inductance gauge, the accuracy to magnetic powder core inductance value test has been improved.

Description

Magnetic powder core alternating current-direct current superposition tester

Technical Field

The utility model relates to a magnetic powder core detection area especially relates to a magnetic powder core alternating current-direct current stack tester.

Background

At present, under the combined action of a direct current magnetic field and an alternating current magnetic field, circuits for measuring inductance values of magnetic elements are all traditional alternating current and direct current superposition test circuits. The circuit comprises an inductor L1, a potentiometer R1, a capacitor C, an inductance meter L, a direct current power supply E, an ammeter A and a tested element L0, wherein the direct current power supply E, the potentiometer R1, the inductor L1, the tested element L0 and the ammeter A are sequentially connected in series to form a direct current loop. The capacitor C, the tested element L0 and the inductance meter L are connected in series to form an alternating current loop. During measurement, the inductor L1 is used for isolating the interference of the alternating current signal to the direct current power supply E, and the capacitor C is used for isolating the interference of the direct current signal to the inductance meter. Although the inductance value measurement of the magnetic element under the combined action of the direct current magnetic field and the alternating current magnetic field can be realized by adopting the circuit. However, when the dc current is too large, inductor L1 is saturated and the inductance is reduced, which leads to a reduction in the inductance and a reduction in the isolation performance from the ac signal. The capacitor C can only suppress low-frequency interference signals in the dc loop, but cannot suppress high-frequency interference signals in the dc loop. Therefore, the conventional test circuit cannot completely isolate the mutual interference of alternating current and direct current signals, and also limits the test frequency range. Test errors can also increase, particularly when the frequency of testing is low or high. Chinese patent document 200610088098.6 proposes an ac/dc superimposed magnetic characteristic test circuit, in which two sets of transformers are connected between an ac circuit and a dc circuit, primary windings of the two transformers are connected in series in the ac circuit in an opposite direction, secondary windings of the two transformers are connected in series in the dc circuit in an opposite direction, and inductance of the primary windings are equal and inductance of the secondary windings are also equal. Interference signals generated by magnetic induction generated by the change of the alternating current magnetic field or the direct current magnetic field in a loop at the other end of the transformer are mutually offset to be zero, so that the mutual interference of the alternating current signals and the direct current signals on the direct current power supply and the inductance meter is solved. However, if the above structure needs to avoid the mutual interference between the dc power source and the inductance meter, the following conditions must be satisfied: i.e. the sum of the voltages of the coils in the dc circuit "-U3 + U4" is equal to the sum of the voltages of the coils in the ac circuit "-K1U 1+ K2U 2" and equal to 0, i.e. so that K2U2= K1U 1. Where K1 is the turns ratio of the two inductors in its transformer T1 and K2 is the turns ratio of the two inductors in its transformer T2. Since the transformers T1-T2 in the above patent are two different transformers, the values of the voltages U1-U2 are different, so that the magnitude of the voltages U1-U2 needs to be determined in the test process to determine the turn ratio of the two transformers, or the two transformers adopt the same type of transformer in the test process, so that U1= U2 and K1= K2, but the connection relationship needs to be changed to ensure that alternating-current voltages with equal magnitudes and opposite directions are generated in the direct-current loops of the alternating-current loops, so that the alternating-current voltages can be mutually cancelled out to eliminate the influence between the alternating-current loops and the direct-current loops. The structure is complex in connection, energy consumption is high in the using process, two transformers are used, one of the transformers is inevitably influenced by magnetic leakage of the other transformer, namely the magnetic fluxes of the two transformers cannot be mutually offset, and therefore the influence of the alternating current signal on the direct current power supply and the direct current signal on the inductance meter still exists. Under the condition of alternating current and direct current superposition, the accuracy of measuring the inductance value of the magnetic powder core is low.

Disclosure of Invention

The utility model aims to provide a: in order to overcome the defects, the alternating current and direct current superposition tester for the magnetic powder core is provided to improve the accuracy of inductance value measurement of the magnetic powder core under the condition of alternating current and direct current superposition.

In order to achieve the above purpose, the technical scheme of the utility model is that: the utility model provides a magnetic powder core alternating current-direct current stack tester, includes the casing and sets up the test circuit in the casing inside, test circuit includes direct current return circuit and the interchange return circuit that connects through a set of transformer, and the transformer includes inductance L1~ L3.

Furthermore, the inductor L1 is a primary coil of the transformer, and the inductors L2-L3 are secondary coils of the transformer.

Further, the direct current loop comprises a power supply source, an ammeter A, capacitors C1-C2 and a resistor R1, one end of the power supply source is connected to one ends of the capacitors C1-C2 and a resistor R1, the other end of the resistor R1 is connected to one end of an inductor L2, the other end of the inductor L2 is connected to one end of an inductor L3, the other end of the inductor L3 is connected to the other ends of the capacitors C1-C2 and the ammeter A, and one end of the ammeter A is connected with the other end of the power supply source.

Further, the alternating current loop comprises resistors R2-R4, capacitors C3-C4, diodes D1-D2 and an inductance meter L, one end of the resistor R2 is connected to one end of the inductance L1, the other end of the resistor R2 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the anode of the diode D1 and one end of the resistor R3, the other end of the resistor R3 is connected to one end of the inductance meter L, the other end of the inductance meter L is connected to the cathode of the diode D2 and the other end of the capacitor C4, the cathode of the diode D1 is connected to the anode of the diode D2, one end of the capacitor C4 is connected to the other end of the resistor R4, and one end of the resistor R4 is connected to the other end of the inductance L1.

Since the proposal is adopted, the beneficial effects of the utility model reside in that: the utility model provides a prior art not enough, the utility model provides a magnetism powder core alternating current-direct current stack tester, its benefit is:

(1) the utility model discloses an alternating current return circuit and direct current return circuit only connect through a set of transformer, compare in two sets of transformers in the conventional art, the access quantity of transformer has been reduced, the energy consumption has been reduced, and avoid the drawback of unable each magnetic core upper voltage of confirming in the test, the direct turn ratio through the control inductance of this application can be with the voltage on the each inductance of better control, make can reduce the friendship, the mutual interference of direct current signal to DC power supply and inductance gauge, the accuracy to magnetic powder core inductance value test has been improved.

(2) Adopt two transformers among the conventional art, and the inevitable influence that can receive another transformer magnetic leakage and bring of one of them transformer, the magnetic flux of two transformers can't offset each other promptly, and alternating current signal is to DC power supply like this, and DC signal still exists to the influence of inductance table, and the utility model discloses do inductance L1~ L3 on same magnetic core, greatly reduced the influence of magnetic leakage between inductance L2, the L3, improved the stability of transformer operation.

(3) The utility model discloses parallelly connected electric capacity at direct current return circuit, the influence of unnecessary alternating current composition to the direct current source of can filtering has established ties electric resistance in alternating current return circuit, can eliminate the influence of unnecessary direct current component to the inductance gauge, has improved the stability of whole return circuit operation, and further improvement is to the accuracy of magnetic powder core inductance value test.

Drawings

Fig. 1 is a circuit diagram of the test circuit of the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

As shown in figure 1, the magnetic powder core alternating current-direct current superposition tester comprises a shell and a test circuit arranged in the shell, wherein the test circuit comprises a direct current loop and an alternating current loop which are connected through a group of transformers, and the transformers comprise inductors L1-L3.

The direct current loop comprises a power supply source, an ammeter A, capacitors C1-C2 and a resistor R1, wherein the power supply source is a battery. One end of a power supply is connected to one ends of capacitors C1-C2 and a resistor R1, the other end of the resistor R1 is connected to one end of an inductor L2, the other end of the inductor L2 is connected to one end of an inductor L3, the other end of the inductor L3 is connected to the other ends of the capacitors C1-C2 and an ammeter A, and one end of the ammeter A is connected with the other end of the power supply.

The alternating current loop comprises resistors R2-R4, capacitors C3-C4, diodes D1-D2 and an inductor meter L, one end of a resistor R2 is connected to one end of an inductor L1, the other end of the resistor R2 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the anode of a diode D1 and one end of the resistor R3, the other end of a resistor R3 is connected to one end of the inductor meter L, the other end of the inductor meter L is connected to the cathode of the diode D2 and the other end of the capacitor C4, the cathode of the diode D1 is connected to the anode of the diode D2, one end of the capacitor C4 is connected to the other end of a resistor R4, and one end of the resistor R4 is connected to the other end of the inductor L1.

Specifically, in the direct current loop, capacitors C1-C2 are connected in parallel between inductors L2-L3, and capacitors C1-C2 can filter the residual signals existing in the loop, namely, the influence of residual alternating current components existing in the loop on a direct current power supply is filtered out, so that the accuracy of measuring the inductance value of the magnetic powder core in the test process is improved. Furthermore, in the alternating current loop, two ends of the inductor L1 are respectively connected with a resistor and a capacitor which are connected in series, the influence of redundant direct current components in the alternating current loop on an inductance meter can be eliminated through the resistor and the capacitor which are connected in series, so that the accuracy of measuring the inductance value of the magnetic powder core in the test process is improved, two ends of the capacitors C3-C4 are also connected with diodes D1-D2, the diodes are used as absorption elements, when spike signals are generated in the alternating current loop, the signals are absorbed, each component in the alternating current loop is prevented from being damaged by high-voltage signals, and the stable operation of the whole loop is ensured.

When the mutual interference of the ac and dc signals to the dc power supply and the current is to be avoided, the sum of the voltage U2 across the coil L2 and the voltage U3 across the coil L3 is only required to be 0, and then the following calculation formula can be obtained according to the coil voltage: u2= K1U1, U3= -K2U1, where K1 is the turn ratio of coils L1 and L2, and K2 is the turn ratio of coils L1 and L3, and if U2+ U3=0 is required, it is only necessary to make K1= K2, that is, the same coils are selected for the transformer to satisfy the equality of the turn ratios. So, compare in traditional test circuit, the utility model discloses reduced the quantity of transformer, reduced the energy consumption, effectively avoided the unable drawback of eliminating the interference that brings of voltage on confirming each magnetic core in the test procedure, this application can be with the voltage on each inductance of better control through the control turn number ratio, can further reduce the mutual interference of handing over, DC signal to DC power supply and inductance gauge, improved the accuracy to magnetic powder core inductance value test. And traditional test circuit adopts two transformers, and one of them transformer inevitablely can receive the influence that another transformer magnetic leakage brought, and the magnetic flux of two transformers can't offset each other promptly, and alternating current signal is to DC power supply like this, and DC signal still exists to the influence of inductance table, and the utility model discloses do inductance L1~ L3 on same magnetic core, greatly reduced the influence of magnetic leakage between inductance L2, the L3, improved the stability of transformer operation, further improvement test's accuracy.

Parts not described in the above modes can be realized by adopting or referring to the prior art.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a magnetic powder core alternating current-direct current stack tester which characterized in that: the testing device comprises a shell and a testing circuit arranged inside the shell, wherein the testing circuit comprises a direct current loop and an alternating current loop which are connected through a group of transformers, and each transformer comprises inductors L1-L3.

2. The magnetic powder core alternating current-direct current superposition tester of claim 1, characterized in that: the inductor L1 is a primary coil of the transformer, and the inductors L2-L3 are secondary coils of the transformer.

3. The magnetic powder core alternating current-direct current superposition tester of claim 1, characterized in that: the direct current loop comprises a power supply source, an ammeter A, capacitors C1-C2 and a resistor R1, one end of the power supply source is connected to one ends of the capacitors C1-C2 and the resistor R1, the other end of the resistor R1 is connected to one end of an inductor L2, the other end of the inductor L2 is connected to one end of an inductor L3, the other end of the inductor L3 is connected to the other ends of the capacitors C1-C2 and the ammeter A, and one end of the ammeter A is connected with the other end of the power supply source.

4. The magnetic powder core alternating current-direct current superposition tester of claim 1, characterized in that: the alternating current loop comprises resistors R2-R4, capacitors C3-C4, diodes D1-D2 and an inductor meter L, one end of a resistor R2 is connected to one end of an inductor L1, the other end of the resistor R2 is connected to one end of a capacitor C3, the other end of the capacitor C3 is connected to the anode of a diode D1 and one end of the resistor R3, the other end of a resistor R3 is connected to one end of the inductor meter L, the other end of the inductor meter L is connected to the cathode of the diode D2 and the other end of the capacitor C4, the cathode of the diode D1 is connected to the anode of the diode D2, one end of the capacitor C4 is connected to the other end of a resistor R4, and one end of the resistor R4 is connected to the other end of the inductor L1.