Rogowski coil PCB structure suitable for intelligent miniature circuit breaker

Abstract

The utility model discloses a Rogowski coil PCB structure suitable for an intelligent miniature circuit breaker. The Rogowski coil PCB structure comprises an integral board and a Rogowski coil PCB. The Rogowski coil PCBs are stacked and welded in multiple layers to form PCB modules, and a plurality of sets of PCB modules are arranged above the integral board in an array mode. According to the utility model, the PCB Rogowski coil design is adopted, and the magnetic conductivity of the coil is close to the vacuum relative magnetic conductivity, so that the frequency response characteristic and the linearity are excellent.

Description

TECHNICAL FIELD

[0001] The utility model relates to a terminal protection electric appliance, concretely relates to a Rogowski coil PCB structure suitable for intelligent miniature circuit breaker. BACKGROUND

[0002] The common intelligent miniature circuit breaker on the market usually adopts current transformer technology to carry out sampling, and the error can reach 5% under the condition of 100A current, which cannot satisfy the metering requirement completely; compared with the traditional miniature circuit breaker, the intelligent miniature circuit breaker can realize high value-added power utilization services such as real-time monitoring of power utilization, real-time early warning of fault, accurate analysis of power failure reason and the like through sampling of voltage, current and other electric parameter information. Among them, the current sampling technology of the intelligent miniature circuit breaker is particularly crucial.

[0003] At present, the current sampling of the common intelligent miniature circuit breaker on the market is mostly realized by the current transformer, but the transformer core is prone to magnetic saturation, which leads to metering overage under large current. A few of them use manganese copper to carry out current sampling, and this mode has the disadvantage that the manganese copper generates heat under large current; at the same time, since the manganese copper belongs to invasive current sampling, its electrical isolation performance is generally poor. UTILITY MODEL CONTENTS

[0004] The utility model wants to solve the technical problem to provide a Rogowski coil PCB structure suitable for intelligent miniature circuit breaker to solve the problems in the background art.

[0005] The Rogowski coil PCB structure suitable for intelligent miniature circuit breaker of the utility model is realized through the following technical scheme, including integral board and Rogowski coil PCB board;

[0006] The Rogowski coil PCB board is stacked and welded in multiple layers to form a PCB module, and the PCB module is provided with multiple groups and is arranged above the integral board.

[0007] As a preferred technical scheme, the PCB winding mode of the Rogowski coil PCB board is circular or square, and the Rogowski coil part of the Rogowski coil PCB board is directly interconnected with the integrator board;The integral board is provided with a white copper shield.

[0008] As a preferred technical scheme, the PCB module is provided with a load copper bar, and the Rogowski coil PCB board is perpendicular to the current-carrying copper bar.

[0009] As a preferred technical scheme, a magnetic concentrating ring is arranged above the load copper bar, and the magnetic concentrating ring is composed of a laminated type and an integral type;The magnetic concentrating ring is arranged in a U shape.

[0010] As a preferred technical scheme, the PCB of the Rogowski coil adopts a high-layer PCB design, and the number of layers is N layers, and the N-layer PCB is repeatedly stacked by M layers to improve the magnetic induction performance on the primary side current.

[0011] As a preferred technical scheme, the typical value of N is 10-32 layers, and the typical value of M is 1-3 layers.

[0012] As a preferred technical scheme, a pressing plate is arranged above the magnetic concentrating ring.

[0013] The beneficial effects of the present application are as follows:

[0014] The present application adopts a PCB Rogowski coil design, and the coil permeability approaches the relative permeability of vacuum, so it has excellent frequency response characteristics and linearity; in a typical case, the linearity in the range of 0-10kA current is better than 0.1%, and the frequency response bandwidth is higher than 1MHz.

[0015] The present application adopts a magnetic concentrating ring design, which can enhance the signal (effective signal) of the to-be-measured field on the one hand, and shield the signal (interference signal) of the non-measured field on the other hand; in a typical case, the amplification effect on the effective signal is not less than 50%, and the interference degree of 100A phase-to-phase strong current on the to-be-measured signal is lower than 0.2%.

[0016] The present application adopts a non-intrusive current sampling technology, so its electrical isolation performance is excellent, and the primary voltage loop and the secondary current loop are not directly electrically connected; in a typical case, the electrical isolation withstand voltage is higher than 5kV.

[0017] The present application adopts a PCB Rogowski coil design, which has a more obvious cost advantage in the field of alternating current measurement compared with TMR tunnel magnetoresistance technology. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a schematic diagram of the PCB layer structure of the present application;

[0020] Figure 2 It is a schematic diagram of the magnetic concentrating ring structure of the present application;

[0021] Figure 3 It is a schematic diagram of the positive electrode structure of the present application;

[0022] Figure 4 It is the round winding schematic view of the PCB Rogowski coil of the utility model;

[0023] Figure 5 It is the square winding schematic view of the PCB Rogowski coil of the utility model;

[0024] Figure 6 It is the integrated structure schematic view of the magnetic ring of the utility model;

[0025] Figure 7 It is the laminated structure schematic view of the magnetic ring of the utility model.

[0026] Mark explanation:

[0027] 1, integral board; 2, Rogowski coil PCB board; 3, white copper shield; 4, load copper bar; 5, magnetic ring; 6, pressing plate. Specific implementation mode

[0028] All features disclosed in the specification, or steps in all disclosed methods or processes, can be combined in any manner except where mutually exclusive.

[0029] As Figure 1 shown, the utility model relates to a kind of Rogowski coil PCB structure suitable for intelligent miniature circuit breaker, including integral board 1 and Rogowski coil PCB board 2;

[0030] The Rogowski coil PCB board 2 is stacked and welded to form a PCB module, and the PCB module is provided with multiple groups and is arranged above the integral board 1.

[0031] As Figure 4 And Figure 5 Shown, the PCB winding mode of Rogowski coil PCB board 2 is circular or square, and the Rogowski coil part of Rogowski coil PCB board 2 is directly interconnected with integrator board level;Integral board 1 is provided with white copper shield 3.

[0032] As Figure 2 Shown, load copper bar 4 is installed on the PCB module, and Rogowski coil PCB board 2 is perpendicular to current-carrying copper bar.

[0033] As Figure 6 And Figure 7 Shown, load copper bar 4 is installed on the PCB module, and Rogowski coil PCB board 2 is perpendicular to current-carrying copper bar.

[0034] In addition, Rogowski coil PCB board 2 adopts high-level PCB design, and the number of layers is N layers, and N layers of PCB boards are repeatedly stacked M layers to improve the magnetic induction performance of primary side current.

[0035] In this embodiment, the typical value of N is 10-32 layers, and the typical value of M is 1-3 layers.

[0036] As shown in Figure 3 In order to play a fixed effect, in this embodiment, the upper side of the magnetic ring 5 is provided with a pressing plate 6.

[0037] The PCB Rogowski coil is used for non-intrusive current sampling of the primary side current, and has excellent frequency response characteristics and linearity.

[0038] Secondly, through the magnetic ring design closely matched with the structure, not only can improve the measurement sensitivity of the measured field, but also can shield the signal of the non-measured field between phases;

[0039] The utility model discloses can improve the measurement precision of intelligent miniature circuit breaker product, and the current measurement precision is superior to 0.5s level under typical condition, satisfies the demand of electric energy measurement.

[0040] The above is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any change or replacement without creative labor is covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be limited to the protection scope defined in the claims.

Claims

1. A Roebel coil PCB structure suitable for use in intelligent miniature circuit breakers, characterized by: Integrate board (1) and Rogowski coil PCB board (2) are included. The Rogowski coil PCB board (2) is stacked and welded in multiple layers to form a PCB module, and the PCB module is provided with multiple groups and is arranged above the integrate board (1).

2. The Roebel coil PCB structure suitable for smart miniature circuit breaker as claimed in claim 1, wherein: The PCB winding mode of the Rogowski coil PCB board (2) is circular or square, and the Rogowski coil part of the Rogowski coil PCB board (2) is directly interconnected with the integrator board; the integrate board (1) is provided with a cupronickel shield (3).

3. The Roebel coil PCB structure suitable for intelligent miniature circuit breaker according to claim 1, characterized in that: The PCB module is provided with a load copper bar (4), and the Rogowski coil PCB board (2) is perpendicular to the load copper bar.

4. The Roebel coil PCB structure suitable for intelligent miniature circuit breaker according to claim 3, characterized in that: A magnetic concentrating ring (5) is arranged above the load copper bar (4), and the magnetic concentrating ring (5) is composed of a laminated type and an integrated type; the magnetic concentrating ring (5) is arranged in a U shape.

5. The Roebel coil PCB structure suitable for intelligent miniature circuit breaker according to claim 1, characterized in that: The Rogowski coil PCB board (2) adopts a high-layer PCB design, and the number of layers is N layers, and N layers of PCB boards are repeatedly stacked by M layers to improve the magnetic induction performance of the primary side current.

6. The Roebel coil PCB structure suitable for intelligent miniature circuit breaker according to claim 5, characterized in that: The typical value of N is 10-32 layers, and the typical value of M is 1-3 layers.

7. The Roebel coil PCB structure suitable for intelligent miniature circuit breaker according to claim 4, characterized in that: A pressing plate (6) is arranged above the magnetic concentrating ring (5).

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