Chip damping resistor type broadband self-integration Rogowski coil current transformer and method

Abstract

In the current transformer, a plurality of PCBs (printed circuit boards) are distributed on a magnetic iron core framework, welding spots, integrating resistors and damping resistors are welded on the PCBs, the welding spots are used for connecting winding wires, the winding wires are uniformly wound among the welding spots on the magnetic iron core framework according to the number of turns at intervals to form windings, and the winding wires are wound on the magnetic iron core framework. The number of spaced turns is associated with the damping resistance. According to the patch damping resistor type broadband self-integration Rogowski coil current transformer, the resonance phenomenon of the coil can be suppressed, and the bandwidth of the self-integration Rogowski coil current transformer is increased to a large extent.

Description

Technical Field

[0001] The invention relates to the technical field of current transformers, in particular to a patch damping resistor type wide-band self-integrating Rogowski coil current transformer and a method. Background Art

[0002] The basic working principle of Rogowski coil for measuring current is the law of electromagnetic induction and Ampere's loop law. The current-carrying conductor passes vertically through the center of the skeleton. When the current to be measured flowing through the current-carrying conductor changes, a changing magnetic field will be generated around the conductor, so that the Rogowski coil produces electromagnetic induction and generates an induced electromotive force at the output end. The entire measurement process is implemented according to the law of electromagnetic induction. Therefore, the measurement circuit of the Rogowski coil is coupled with the current-carrying conductor through the magnetic field. There is no direct electrical connection, which will not affect the measurement circuit of the coil, and it has high safety and reliability.

[0003] At present, the frequency band range of self-integrating Rogowski coil current transformers is concentrated in 0.25Hz~400MHz, and the frequency bandwidth of a single product is within 200MHz. The bandwidth of self-integrating Rogowski coil current transformers is limited to a narrower range due to the resonance phenomenon of the coil itself.

[0004] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] In view of the shortcomings or defects of the prior art, a patch damping resistor type wide-band self-integrating Rogowski coil current transformer and method are provided, which can suppress the resonance phenomenon of the coil itself and greatly increase the bandwidth of the self-integrating Rogowski coil current transformer.

[0006] The purpose of the present invention is achieved through the following technical solutions.

[0007] A patch damping resistor type wide-band self-integrating Rogowski coil current transformer comprises:

[0008] Magnetic core frame,

[0009] A plurality of PCB boards are distributed on the magnetic core frame, and the PCB boards are welded with solder joints for connecting windings, integral resistors and damping resistors,

[0010] The winding is evenly wound between the welding points on the magnetic core frame according to the number of turns, and the number of turns is related to the damping resistor.

[0011] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the frequency band of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is at least greater than 30 kHz.

[0012] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the magnetic iron core skeleton is a circular ring structure.

[0013] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the voltage signal on the integrating resistor is the output of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer.

[0014] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the output of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is proportional to the current to be measured.

[0015] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is in a self-integrating working mode.

[0016] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the winding is connected to a BNC connector to output a signal.

[0017] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, a plurality of PCB boards are fixed in a uniform array on the front side of the magnetic iron core frame.

[0018] In the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the output signal frequency band is adjusted by adjusting the number of turns of the winding, the winding material, the winding wire diameter or the integral resistor connected thereto.

[0019] The preparation method of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer comprises the following steps:

[0020] Step 1, draw a PCB board for soldering the solder joints, damping resistors and integral resistors for connecting the winding wires to the PCB;

[0021] Step 2, fix the PCB board on the plane of the magnetic core frame;

[0022] Step 3, determine the number of turns of the winding when welding the damping resistor, and evenly wind the winding wire on the frame between the welding points according to the number of turns;

[0023] Step 4, solder the solder joints, damping resistor and integral resistor connecting the winding to the PCB on the PCB;

[0024] Step 5, after the welded product is insulated, it is placed in a shielding box, and the output signal of the winding is led out using a BNC connector;

[0025] Step 6: Insulate and package the entire shielding box.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention utilizes welding an integral resistor and a damping resistor on a PCB to suppress the resonance phenomenon of the coil itself and increase the frequency bandwidth of a self-integrating Rogowski coil type current transformer. The method of welding a chip resistor on a PCB reduces the leakage inductance introduced by the resistor itself, suppresses the resonance of the coil itself without interfering with the coil, and can effectively increase the frequency bandwidth of the self-integrating Rogowski coil type current transformer. There is no external integrator in the entire transformer, and the output of the transformer is proportional to the current to be measured, and the transformer is in a self-integration working mode. The damping resistor can damp harmful resonant signals. Introducing a damping resistor between the winding and the ground can suppress unnecessary resonant components in the damping signal to eliminate parasitic resonant components in the signal. After the damping resistor weakens the resonant components in the transformer, the bandwidth of the transformer's self-integration working mode can be effectively increased.

[0028] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0030] In the attached picture:

[0031] Figure 1 Physical picture of the current transformer for this application;

[0032] Figure 2 This is the design drawing of the PCB part of the current transformer for this application;

[0033] Figure 3 This is a schematic diagram of the test results of the output signal frequency band of the current transformer of this application;

[0034] Figure 4 A flow chart for making a current transformer for this application.

[0035] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0038] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0039] For a better understanding, Figures 1 to 4 As shown, a patch damping resistor type wide-band self-integrating Rogowski coil current transformer includes:

[0040] Magnetic core frame,

[0041] A plurality of PCB boards are distributed on the magnetic core frame, and the PCB boards are welded with solder joints for connecting windings, integral resistors and damping resistors,

[0042] The winding is evenly wound between the welding points on the magnetic core frame according to the number of turns, and the number of turns is related to the damping resistor.

[0043] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the frequency band of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is at least greater than 30 kHz.

[0044] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the magnetic iron core skeleton is a circular ring structure.

[0045] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the voltage signal on the integrating resistor is the output of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer.

[0046] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the output of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is proportional to the current to be measured.

[0047] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is in a self-integrating working mode.

[0048] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the winding is connected to a BNC connector to output a signal.

[0049] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, a plurality of PCB boards are fixed in a uniform array on the front side of the magnetic core frame.

[0050] In a preferred embodiment of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer, the output signal frequency band is adjusted by adjusting the number of turns of the winding, the winding material, the winding wire diameter or the integral resistor connected thereto.

[0051] The preparation method of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer comprises the following steps:

[0052] Step 1, draw a PCB board for soldering the solder joints, damping resistors and integral resistors for connecting the winding wires to the PCB;

[0053] Step 2, fix the PCB board on the plane of the magnetic core frame;

[0054] Step 3, determine the number of turns of the winding when welding the damping resistor, and evenly wind the winding wire on the frame between the welding points according to the number of turns;

[0055] Step 4, solder the solder joints, damping resistor and integral resistor connecting the winding to the PCB on the PCB;

[0056] Step 5, after the welded product is insulated, it is placed in a shielding box, and the output signal of the winding is led out using a BNC connector;

[0057] Step 6, insulating the entire shielding box. A patch damping resistor type broadband self-integrating Rogowski coil current transformer, which includes a magnetic iron core frame, a PCB, and a winding.

[0058] See also Figure 2The manufacturing process of a patch damping resistor type wide-band self-integrating Rogowski coil current transformer includes:

[0059] First, draw the PCB for soldering the connection points of the winding wire to the PCB, the damping resistor and the integral resistor;

[0060] Further, the PCB is fixed on the plane of the magnetic core frame;

[0061] Further, the number of turns of the winding when welding the damping resistor is determined, and the winding wire is evenly wound on the frame between the welding points according to the number of turns;

[0062] Further, the connection points between the winding and the PCB, the damping resistor and the integral resistor are welded on the PCB;

[0063] Furthermore, the welded finished product is insulated and placed in a shielding box, and the output signal of the winding is led out using a BNC connector;

[0064] Furthermore, the shielding box is entirely insulated and packaged.

[0065] In one embodiment, after placing a PCB on the magnetic core skeleton, a conductor is wound to form a transformer winding, and then the connection points between the winding and the PCB, the damping resistor and the integral resistor are welded on the PCB. The method of welding the chip resistor on the PCB reduces the leakage inductance brought by the resistor itself, suppressing the coil's own resonance while not interfering with the coil. The wound winding is placed in a shielding shell, and the voltage signal on the integral resistor is the output of the transformer. There is no external integrator in the entire transformer, and the output of the transformer is proportional to the current to be measured. The transformer is in a self-integration working mode, and the typical frequency band is 30kHz~500MHz.

[0066] In one embodiment, the method of soldering chip resistors on PCB reduces the leakage inductance brought by the resistor itself, suppressing the coil's own resonance while not interfering with the coil. The wound winding is placed in a shielding shell, and the voltage signal on the integral resistor is the output of the transformer. There is no external integrator in the entire transformer, and the output of the transformer is proportional to the current to be measured. The transformer is in a self-integration working mode. The damping resistor can damp harmful resonant signals. Introducing a damping resistor between the winding and the ground can suppress the unwanted resonant components in the damping signal to eliminate the parasitic resonant components in the signal.

[0067] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0068] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A patch damping resistor type wide-band self-integrating Rogowski coil current transformer, characterized in that: These include, Magnetic core frame, A plurality of PCB boards are distributed on the magnetic core frame, and the PCB boards are welded with solder joints for connecting windings, integral resistors and damping resistors, The winding is evenly wound between the welding points on the magnetic core frame according to the number of turns, and the number of turns is related to the damping resistor.

2. The patch damping resistor type wide-band self-integrating Rogowski coil current transformer according to claim 1, characterized in that: Preferably, the frequency band of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer is at least greater than 30 kHz.

3. The patch damping resistor type wide-band self-integrating Rogowski coil current transformer according to claim 1, characterized in that: The voltage signal on the integrating resistor is the output of the patch damping resistor type wide-band self-integrating Rogowski coil current transformer.

4. The patch damping resistor type wide-band self-integrating Rogowski coil current transformer according to claim 1, characterized in that: The patch damping resistor type wide-frequency self-integrating Rogowski coil current transformer is in a self-integrating working mode.

5. The patch damping resistor type wide-band self-integrating Rogowski coil current transformer according to claim 1, characterized in that: The winding is connected to a BNC connector to output a signal.

6. A method for preparing a patch damping resistor type wide-band self-integrating Rogowski coil current transformer as claimed in any one of claims 1 to 5, characterized in that: It includes the following steps, Step 1, draw a PCB board for soldering the solder joints, damping resistors and integral resistors for connecting the winding wires to the PCB; Step 2, fix the PCB board on the plane of the magnetic core frame; Step 3, determine the number of turns of the winding when welding the damping resistor, and evenly wind the winding wire on the frame between the welding points according to the number of turns; Step 4, solder the solder joints, damping resistor and integral resistor connecting the winding to the PCB on the PCB; Step 5, after the welded product is insulated, it is placed in a shielding box, and the output signal of the winding is led out using a BNC connector; Step 6: Insulate and package the entire shielding box.

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