CN115436680A - A small resistance signal resistor for self-integrating Rogowski coil - Google Patents

Abstract

The invention relates to a coaxial small-resistance-value resistor, in particular to a small-resistance-value signal resistor for a self-integrating Rogowski coil, and solves the technical problems of complex structure and high cost of the conventional signal resistor. The small-resistance signal resistor for the self-integrating Rogowski coil is characterized in that: the chip resistor chip comprises a first connector, a transfer flange, a connecting assembly, an inner core, N chip resistors and a second connector, wherein N is more than or equal to 2; one end of the connecting component is connected with the first connector, and the other end of the connecting component is connected with the second connector; one end of the adapter flange is coaxially connected with the first connector, and the other end of the adapter flange is sleeved on the inner wall of the second connector; the inner core is sleeved on the connecting component; the other end of the inner core, the adapter flange and the second connector form an accommodating cavity; the N chip resistors are uniformly arranged in the accommodating cavity along the circumference; the signal resistor has small volume and can meet the requirement of a Rogowski coil in a large pulse power device.

Description

A small resistance signal resistor for self-integrating Rogowski coil

technical field

The invention relates to a coaxial small-resistance resistor, in particular to a small-resistance signal resistor used for a self-integrating Rogowski coil.

Background technique

With the continuous development and wide application of pulse power technology, it is a very important task to accurately measure large pulse currents. In the pulse power device, to measure the pulse current of hundreds of kA, the Rogowski coil current detector is often used. According to the integration method, Rogowski coils can be divided into two types: self-integrating and external integrating. For pulsed large currents with pulse widths below hundreds of ns, self-integrating Rogowski coils are often used. Self-integrating Rogowski coils usually use coaxial small resistance resistors as signal resistors, which can be divided into two types according to the way of use: one is a special signal resistor fixed together with the Rogowski coil, which is mostly used for Rogowski coils that can move freely. coil. The other is a general-purpose signal resistor that can be connected with different Rogowski coils, and is mostly used for Rogowski coils fixed to pulse power devices. The resistance value of the signal resistance directly affects the output signal of the Rogowski coil, and the two are generally proportional. In the measurement of hundreds of kA pulse current, due to the large amplitude of the current to be measured, in order to avoid the insulation failure of the Rogowski coil port or the damage of the single components of the measurement circuit (including but not limited to signal resistance, attenuator, oscilloscope, etc.), the signal resistance The resistance value is generally several Ω or even below 1 Ω. The signal resistance itself has inductance, which will have a certain impact on the output of the Rogowski coil. In the case of the same inductance, the smaller the resistance of the signal resistance, the greater the influence of the inductance, so it is necessary to minimize the influence of the inductance. Generally, the method of reducing the inductance value is used to reduce the influence of the inductance, and the following three schemes are usually adopted: one is to use multiple small resistors in parallel to reduce the inductance; the other is to reduce the inductance by making the signal resistance structure more compact; the third is to directly use Coaxial type body resistance.

In the prior art, Chinese patent CN104502664A discloses "low resistance non-inductive self-integrating Rogowski coil integral resistor and its manufacturing method", which introduces a signal resistor made of a cylindrical metal support to make a loop device, and uses a compact structure to reduce inductance. Chinese patent CN106154013B discloses "a composite Rogowski coil integral resistor and its manufacturing method", which introduces a signal resistor composed of an external integral resistor, self-integral resistor, and integral capacitor. It adopts a compact structure to reduce inductance, and uses Capacitive compensation reduces the effect of inductance. A Chinese patent of the China Shipbuilding Industry System Engineering Research Institute, the publication number is CN113917214A, discloses "a self-integrating Rogowski coil disc-shaped integrating resistor and its manufacturing method", using a disc-shaped PCB and a PCB that is arranged on the PCB to form a A plurality of chip resistors arranged radially in a ring form a signal resistor, and multiple resistors are connected in parallel to reduce inductance. Another Chinese patent publication number is CN212341315U, which discloses "a coaxial disc-shaped water resistor for self-integrating Rogowski coils", which is made by using two stainless steel tubes inside and outside as two poles and internally charged electrolyte solution for self-integrating Rogowski coils. The disk-shaped signal resistance of the coil is reduced inductance by making a coaxial body resistance. The four signal resistors described in the above information are only applicable to specific reflow configurations. The article "A Compact Coaxial Non-inductive Resistor" published by the National University of Defense Technology in "Electronic Components and Materials", 1997, 16 (5), used a large number of small stainless steel cylinder resistors to make a compact signal resistor. Using multiple small resistors in parallel and compact structure to reduce inductance. National University of Defense Technology published "Intense Lasers and Particle Beams", 2009, 21(10) article "Response of Rogowski Coil Signal Resistance to Nanosecond Pulse High Current", using 50 metal film resistors connected in parallel to form a signal resistor, using Multiple resistors are connected in parallel to reduce inductance. The two types introduced in the materials of National University of Defense Technology are general-purpose signal resistors.

For large-scale pulse power devices, tens or even hundreds of Rogowski coils may be installed, so it is necessary to prepare a large number of signal resistors at the same time, but the number cannot reach the point where the cost can be reduced through mass production, which requires A simple, low-cost signal resistor support. In addition, in large-scale pulse power devices, the surrounding structures of these Rogowski coils are different, leaving limited space for installing signal resistors, which requires the radial dimension of signal resistors to be as small as possible to accommodate more Rogowski coil structures. Among the two general-purpose signal resistors mentioned above, "a compact coaxial non-inductive resistor" has the smallest radial size, but has a complex structure, long production cycle, and high cost; while "Rogowski coil signal resistance is The signal resistor introduced in Response to Large Current" has a large radial dimension, which is not conducive to installation in some small spaces.

Contents of the invention

The purpose of the present invention is to solve the technical problem of complex structure and high cost of existing signal resistors, and provide a small-value signal resistor for self-integrating Rogowski coils.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A small resistance signal resistor for self-integrating Rogowski coils, which is special in that it includes a first connector, an adapter flange, a connecting component, an inner core, N chip resistors and a second connector, N ≥2;

One end of the connecting component is connected to the first inner pin of the first connector, and the other end of the connecting component is connected to the second inner pin of the second connector;

One end of the adapter flange is coaxially connected to the first connector, and the other end is sleeved on the inner wall of the second connector;

The inner core is sleeved on the connection assembly; and one end of the inner core is connected to the first inner needle of the first connector, and the other end of the inner core forms an accommodating cavity with the adapter flange and the second connector;

N chip resistors are evenly arranged in the accommodating cavity along the circumference, and the two ends of the chip resistors are respectively connected to the outer wall of the inner core and the inner wall of the adapter flange;

The first connector is used for connecting with the output port of the self-integrating Rogowski coil, and the second connector is used for connecting with the oscilloscope; or, the first connector is used for connecting with the oscilloscope, and the second connector is used for connecting with the output port of the self-integrating Rogowski coil.

Further, the inner core is a cylindrical structure; the outer wall of the inner core is provided with a plurality of blind slots adapted to one end of the chip resistor;

There is a ring-shaped step on the inner wall of the transfer flange corresponding to the other end of the chip resistor;

One end of the chip resistor is located in the blind slot and connected to the bottom of the blind slot; the other end of the chip resistor is located on the annular step and connected to the inner wall of the annular step.

Further, the value of N is 6.

Further, the connecting component is a connecting rod;

The first connector is an N-50KF connector;

The second connector is an N-J connector.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

(1) The present invention is used for the small-resistance signal resistance of self-integrating Rogowski coil, adopts the first connector, adapter flange, connection assembly, inner core, N chip resistors and the second connector, and the first The first inner needle of the connector is connected to the second inner needle of the second connector through the connection assembly, and the inner core is sleeved on the connection assembly, so that the signal resistor of the present invention has the characteristics of small size, simple and compact structure, and high bandwidth upper limit. advantage. The two connectors are connected through an adapter flange to shield external electromagnetic interference, and can meet the demand for self-integrating Rogowski coils in large pulse power devices.

(2) The small-value signal resistance used in the self-integrating Rogowski coil of the present invention is evenly distributed in the accommodation cavity formed by the inner core, the adapter flange and the second connector, ensuring small volume and high power Under the premise, the composition structure of the signal resistor is simplified, and the difficulty of the manufacturing process is reduced.

(3) The present invention is used for the small-value signal resistor of the self-integrating Rogowski coil, and can also use general-purpose components on the market, so that the overall cost is low and mass production is easier.

Description of drawings

FIG. 1 is a schematic structural diagram of a small-value signal resistor used in a self-integrating Rogowski coil according to the present invention.

Fig. 2 is a schematic diagram of the installation structure of the chip resistor inside the adapter flange in the embodiment of the small resistance signal resistor used in the self-integrating Rogowski coil of the present invention.

Fig. 3 is a schematic diagram of the working process in the embodiment of the small resistance signal resistor used in the self-integrating Rogowski coil of the present invention, in which i(t) is the induced current in the self-integrating Rogowski coil, and V(t) is the voltage signal.

The reference signs in the figure are:

1-first connector, 11-first inner pin, 2-transfer flange, 3-connection assembly, 4-inner core, 5-chip resistor, 6-second connector, 61-second inner pin , 7-self-integrating Rogowski coil, 8-output connector, 9-signal transmission cable, 10-oscilloscope.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the technical solutions in the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, a small resistance signal resistor for self-integrating Rogowski coils includes a first connector 1, an adapter flange 2, a connecting component 3 (connecting rod), an inner core 4, and N patches Resistor 5 and second connector 6, N greater than or equal to 2.

One end of the connection assembly 3 is connected to the first inner needle 11 of the first connector 1, and the other end of the connection assembly 3 is connected to the second inner needle 61 of the second connector 6; one end of the adapter flange 2 is connected to the first The connector 1 is coaxially connected, and the other end is sleeved on the inner wall of the second connector 6; one end of the adapter flange 2 is connected to the first connector 1 by screws, and the other end is connected to the second connector 6 by threads, and the transfer flange 2 The connecting flange 2, the first connector 1 and the second connector 6 jointly constitute the casing of the signal resistor of the present invention, which plays a role of shielding external electromagnetic interference.

The inner core 4 is sleeved on the connection assembly 3; and one end of the inner core 4 is connected with the first inner needle 11 of the first connector 1, and the other end of the inner core 4 is formed with the adapter flange 2 and the second connector 6 accommodating cavity;

N chip resistors 5 are evenly arranged in the cavity along the circumference, and both ends of the chip resistors 5 are respectively connected to the outer wall of the inner core 4 and the inner wall of the adapter flange 2 . N chip resistors 5 are uniformly distributed between the inner core 4 and the adapter flange 2 relative to the inner core axis angular direction, one end of the chip resistor 5 is welded to the outer wall of the inner core 4, and the other end is welded to the outer wall of the adapter flange 2 The inner wall is welded to form the resistor body part of the signal resistor of the present invention.

The first connector 1 is used for connecting with the output port of the self-integrating Rogowski coil 7, and the second connector 6 is used for connecting with the oscilloscope 10; or, the first connector 1 is used for connecting with the oscilloscope 10, and the second connector 6 is used for connecting with the oscilloscope 10. It is connected with the output port of the self-integrating Rogowski coil 7.

In this embodiment, preferably, the inner core 4 is a cylindrical structure; the outer wall of the inner core 4 is provided with a plurality of blind slots matching one end of the chip resistor 5 for clamping electrodes. On the inner wall of the transfer flange 2, there is an annular step corresponding to the other end of the chip resistor 5; one end of the chip resistor 5 is located in the blind slot and connected to the bottom of the blind slot; the other end of the chip resistor 5 is located on the annular step And it is connected with the inner wall of the annular step. The value of N is 6, the blind slot is a rectangular slot, and the number is 6; the 6 chip resistors 5 are evenly arranged between the inner core 4 and the adapter flange 2 . The connecting component 3 is a connecting rod; the first connector 1 is an N-50KF connector; the second connector 6 is an N-J connector.

First, weld the connecting rod to the inner pin of the N-50KF connection, put the inner core 4 on the outside of the connecting rod, one end of the inner core 4 is connected to the inner pin of the N-50KF connector, and the inner core 4 and the connecting rod are connected by soldering .

Then, connect the adapter flange 2 with the N-50KF connector through screws.

As shown in Figure 2, put six pieces of chip resistors 5 symmetrically and sideways between the inner core 4 and the adapter flange 2, one end of the chip resistors 5 is placed in the blind slot on the top of the inner core 4, and the other end Placed on the step of the transfer flange 2 for supporting the chip resistor 5, the electrodes at both ends of the chip resistor 5 are welded to the inner core 4 and the transfer flange 2 respectively.

Then, remove the inner pin of the N-J connector from the N-J connector and solder it to the connecting rod.

Finally, the N-J connector and the transfer flange 2 are connected through threads to complete the assembly of the small-value signal resistor for the self-integrating Rogowski coil.

The signal resistor of the present invention includes an N-50KF connector, an adapter flange 2, a connecting rod, an inner core 4, six chip resistors 5, and an N-J connector. The inner needles of the two connectors are connected through a connecting rod, and the inner cores are welded on the connecting rod with 4 sleeves. The shells of the two connectors are connected through the adapter flange 2, which plays a role of shielding external electromagnetic interference. The chip resistors 5 are symmetrically distributed between the inner core 4 and the outer shell, so that the signal resistor of the present invention has the advantages of small size, simple structure, low cost, and high bandwidth upper limit.

The working process of above-mentioned embodiment is as follows:

As shown in Figure 3, the signal resistance of the present invention is connected on the output port of the output end connector 8 of the self-integrating Rogowski coil 7, and the port that the signal resistance is connected to the output end connector 8 output port connected to the self-integrating Rogowski coil 7 It is called the input port of the signal resistance, and the other end is called the output port of the signal resistance.

The signal resistance in the present invention has no direction, and both the first connector 1 and the second connector 6 can be used as input ports. In other embodiments, the output connector 8 is not necessarily an N-type connector, and its connection with the signal resistor can use other connectors as a relay. The self-integrating Rogowski coil 7 and the signal resistance of the present invention together form a complete current measurement probe, and parameters such as sensitivity and leading edge response of the probe are closely related to the resistance value R of the signal resistance.

Assuming that the above-mentioned current measuring probe is to be used to measure the current I(t) to be measured, and the induced current in the self-integrating Rogowski coil 7 is i(t), then when i(t) flows through the signal resistance, a voltage signal is generated on the signal resistance V(t), there is V(t)=i(t)·R.

The voltage signal V(t) is transmitted to the oscilloscope 10 through the signal transmission cable 9 and recorded by the oscilloscope 10 . The voltage signal V(t) is proportional to the current I(t) to be measured, and the amplitude of the current I(t) to be measured can be inferred by measuring the amplitude of the voltage signal V(t).

Claims (4)

1. A small resistance signal resistor for self-integrating Rogowski coils, characterized in that it includes a first connector (1), an adapter flange (2), a connection assembly (3), an inner core (4), N chip resistors (5) and the second connector (6), N≥2; One end of the connection component (3) is connected with the first inner needle (11) of the first connector (1), and the other end of the connection component (3) is connected with the second inner needle (61) of the second connector (6). )connect; One end of the transfer flange (2) is coaxially connected to the first connector (1), and the other end is sleeved on the inner wall of the second connector (6); The inner core (4) is sheathed on the connection assembly (3); and one end of the inner core (4) is connected to the first inner needle (11) of the first connector (1), and the other end of the inner core (4) One end forms an accommodating cavity with the adapter flange (2) and the second connector (6); The N chip resistors (5) are evenly arranged in the accommodation cavity along the circumference, and the two ends of the chip resistors (5) are respectively connected to the outer wall of the inner core (4) and the connecting flange (2) Inner wall connection; The first connector (1) is used for connecting with the output port of the self-integrating Rogowski coil (7), and the second connector (6) is used for connecting with the oscilloscope (10); or, the first connector (1 ) is used for connecting with the oscilloscope (10), and the second connector (6) is used for connecting with the output port of the self-integrating Rogowski coil (7). 2. A kind of small resistance signal resistor for self-integrating Rogowski coil according to claim 1, characterized in that: The inner core (4) is a cylindrical structure; the outer wall of the inner core (4) is provided with a plurality of blind slots matching one end of the chip resistor (5); The inner wall of the adapter flange (2) is provided with an annular step corresponding to the other end of the chip resistor (5); One end of the chip resistor (5) is located in the blind slot and connected to the bottom of the blind slot; the other end of the chip resistor (5) is located on the annular step and connected to the inner wall of the annular step. 3 . A small-value signal resistor for a self-integrating Rogowski coil according to claim 4 , wherein the value of N is 6. 4 . 4. A kind of small resistance signal resistor for self-integrating Rogowski coil according to any one of claims 1-3, characterized in that: The connecting component (3) is a connecting rod; The first connector (1) is an N-50KF connector; The second connector (6) is an N-J connector.

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