Common mode choke coil device

Abstract

The goal is to miniaturize and lighten common mode choke coil devices. [Solution] A first common mode choke coil and a second common mode choke coil are arranged parallel to each other so that their annular cores are coaxial. A pair of opposing metal rings, formed as annular metal plates, are attached to the opposing annular surfaces of the first and second common mode choke coils, and the pair of opposing metal rings are connected to a reference potential. Since the pair of opposing metal rings function as capacitances with parasitic capacitances corresponding to the area of ​​the opposing surfaces and the distance between the opposing surfaces, the common mode choke coil device functions as an LCL filter.

Description

Technical Field

[0001] The present disclosure relates to a common-mode choke coil device.

Background Art

[0002] Conventionally, as this type of technology, in a power supply system, a technology has been proposed that reduces common-mode noise, normal-mode noise, and reflection noise to reduce the influence of noise on a driven device (see, for example, Patent Document 1). In this technology, due to noise, magnetic flux is generated in the core of the common-mode choke, and an induced electromotive force is generated in the power line by this magnetic flux. Even when a current flows and becomes reflection noise of the power line, the reflection noise is reduced by the winding in the core of the common-mode choke and a resistor connected to the winding. Further, even when the noise reflected by the driven device passes through the common-mode choke, the CR circuit converts this reflection noise into thermal energy by the resistance component of the resistor and consumes it.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A common-mode choke coil is used as a noise countermeasure as an LC filter or an LCL filter by connecting a Y capacitor, but there is a concern about an increase in size, weight, and cost because the magnetic core becomes large or a high-cost magnetic core with a large magnetic permeability must be applied.

[0005] The main object of the common-mode choke coil device of the present disclosure is to achieve miniaturization and weight reduction.

Means for Solving the Problems

[0006] The common mode choke coil device of this disclosure employs the following means to achieve the main objective described above.

[0007] The common mode choke coil device of this disclosure is A common mode choke coil device having a first common mode choke coil and a second common mode choke coil, The first common mode choke coil and the second common mode choke coil are arranged in parallel so that their annular cores are coaxial. A pair of opposing metal rings, formed as annular metal plates, are attached to the opposing annular surfaces of the first common mode choke coil and the second common mode choke coil. The pair of opposing metal rings are connected to a reference potential. It is characterized by the following:

[0008] The common mode choke coil device of this disclosure comprises a first common mode choke coil and a second common mode choke coil. The first and second common mode choke coils are arranged parallel to each other so that their annular cores are coaxial. A pair of opposing metal rings, formed as annular metal plates, are attached to the opposing annular surfaces of the first and second common mode choke coils, and these pair of opposing metal rings are connected to a reference potential. If the area of ​​the opposing surfaces of the pair of opposing metal rings is S, the distance between the opposing surfaces of the pair of opposing metal rings is d, and the dielectric constant is ε, then the pair of opposing metal rings functions as a capacitance whose parasitic capacitance C is calculated as C = ε·S / d. Therefore, an LCL filter can be constructed using the first common mode choke coil, the second common mode choke coil, and the pair of opposing metal rings, thereby reducing the number of parts and costs. As a result, the common mode choke coil device can be made smaller and lighter.

[0009] In the common mode choke coil device of the present disclosure, the pair of opposing metal rings may be mounted on the outside of the windings of the first common mode choke coil and the second common mode choke coil, or the pair of opposing metal rings may be mounted on the inside of the windings of the first common mode choke coil and the second common mode choke coil. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing the configuration of a common mode choke coil device 20 as one embodiment of the present disclosure. [Figure 2] This is a schematic diagram showing the configuration of the common mode choke coil device 120 of the comparative example. [Modes for carrying out the invention]

[0011] Next, embodiments for implementing the present disclosure will be described. Figure 1 is a schematic diagram showing the configuration of a common mode choke coil device 20 as one embodiment of the present disclosure. As shown in the figure, the common mode choke coil device 20 comprises a first common mode choke coil 24, a second common mode choke coil 26, a first opposing metal ring 34, and a second opposing metal ring 36.

[0012] The first common mode choke coil 24 and the second common mode choke coil 26 are configured as well-known common mode choke coils, with windings 22a, 28a and windings 22b, 28b wound around a core formed in an annular shape from a soft magnetic material such as a nanocrystalline alloy or ferrite. Windings 22a and 22b of the first common mode choke coil 24 are connected to windings 28a and 28b of the second common mode choke coil 26. The first common mode choke coil 24 and the second common mode choke coil 26 are arranged in parallel so as to be coaxial.

[0013] The first opposing metal ring 34 and the second opposing metal ring 36 are constructed from chargeable metal plates in a thin, annular shape, similar to the core of the first common-mode choke coil 24. The first opposing metal ring 34 is attached to the surface of the first common-mode choke coil 24 facing the second common-mode choke coil 26, and the second opposing metal ring 36 is attached to the surface of the second common-mode choke coil 26 facing the first common-mode choke coil 24. In other words, the first opposing metal ring 34 and the second opposing metal ring 36 are attached to the opposing surfaces of the first common-mode choke coil 24 and the second common-mode choke coil 26. Furthermore, the first opposing metal ring 34 and the second opposing metal ring 36 are connected to a grounded reference potential 40.

[0014] Now, let's consider the comparative example common mode choke coil device 120 illustrated in Figure 2. The comparative example common mode choke coil device 120 is a well-known LCL filter in which a first common mode choke coil 124 and a second common mode choke coil 126 are connected by their windings 122a, 122b and windings 128a, 128b, and the connection points of windings 122a, 122b and windings 128a, 128b are connected to a grounded reference potential 140 via capacitors 134, 136. In the common mode choke coil device 20 of the embodiment shown in Figure 1, the first opposing metal ring 34 and the second opposing metal ring 36 function as capacitances whose parasitic capacitance C is calculated as C = ε·S / d, where S is the area of ​​the opposing surfaces, d is the distance between the opposing surfaces, and ε is the dielectric constant. Therefore, it functions as an LCL filter, similar to the comparative example common mode choke coil device 120 illustrated in Figure 2. In the common mode choke coil device 20 of this embodiment, a capacitor is not required, thus reducing the number of parts and costs. As a result, the common mode choke coil device can be made smaller and lighter.

[0015] In the common mode choke coil device 20 of the embodiment described above, the first common mode choke coil 24 and the second common mode choke coil 26 are arranged in parallel so as to be coaxial. The first opposing metal ring 34 and the second opposing metal ring 36, which are made of thin plate annular shapes similar to the core of the first common mode choke coil 24, are attached to the opposing surfaces of the first common mode choke coil 24 and the second common mode choke coil 26, and the first opposing metal ring 34 and the second opposing metal ring 36 are connected to a grounded reference potential 40. As a result, the common mode choke coil device 20 can function as an LCL filter. Since a capacitor is not required, the number of parts and cost can be reduced. As a result, the common mode choke coil device can be made smaller and lighter.

[0016] In the common mode choke coil device 20 of this embodiment, a first common mode choke coil 24 with windings 22a and 22b wound around it and a second common mode choke coil 26 with windings 28a and 28b wound around it are placed parallel to each other so as to be coaxial, and a first opposing metal ring 34 and a second opposing metal ring 36 are attached to their opposing surfaces. However, a first common mode choke coil constructed by windings 22a and 22b with the first opposing metal ring 34 attached to the core and a second common mode choke coil constructed by windings 28a and 28b with the second opposing metal ring 36 attached to the core may also be arranged parallel to each other so as to be coaxial, and the first opposing metal ring 34 and the second opposing metal ring 36 face each other.

[0017] The correspondence between the main elements of the embodiment and the main elements of the invention described in the section on means for solving the problem will be explained. In the embodiment, the first common mode choke coil 24 corresponds to the "first common mode choke coil", the second common mode choke coil 26 corresponds to the "second common mode choke coil", and the first opposing metal ring 34 and the second opposing metal ring 36 correspond to the "pair of opposing metal rings".

[0018] Note that the correspondence between the main elements of the embodiments and the main elements of the invention described in the section of means for solving the problems is an example for specifically explaining the mode for implementing the invention described in the section of means for solving the problems in the embodiments. Therefore, it does not limit the elements of the invention described in the section of means for solving the problems. That is, the interpretation of the invention described in the section of means for solving the problems should be made based on the description in that section, and the embodiments are merely specific examples of the invention described in the section of means for solving the problems.

[0019] As described above, the present disclosure has been described using embodiments. However, the present disclosure is not limited to such embodiments, and it is needless to say that it can be implemented in various forms without departing from the gist of the present disclosure.

Industrial Applicability

[0020] The present disclosure can be used in the manufacturing industry of common mode choke coil devices and the like.

Explanation of Reference Numerals

[0021] 20,120 common mode choke coil device, 22a, 22b, 122a, 122b windings, 24, 124 first common mode choke coil, 26, 126 second common mode choke coil, 28a, 28b, 128a, 128b windings, 34 first opposing metal ring, 36 second opposing metal ring, 40, 140 reference potential, 134, 136 capacitor.

Claims

1. A common mode choke coil device having a first common mode choke coil and a second common mode choke coil, The first common mode choke coil and the second common mode choke coil are arranged in parallel so that their annular cores are coaxial. A pair of opposing metal rings, formed as annular metal plates, are attached to the opposing annular surfaces of the first common mode choke coil and the second common mode choke coil. The pair of opposing metal rings are connected to a reference potential. A common mode choke coil device characterized by the following features.

2. A common mode choke coil device according to claim 1, The pair of opposing metal rings are attached to the outside of the windings of the first common mode choke coil and the second common mode choke coil. Common mode choke coil device.

3. A common mode choke coil device according to claim 1, The pair of opposing metal rings are mounted inside the windings of the first common mode choke coil and the second common mode choke coil. Common mode choke coil device.

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