Small differential mode inductor adopting relay coil

Abstract

The invention relates to a small differential mode inductor adopting a relay coil. The small differential mode inductor comprises a first winding, a second winding, a magnetic core, the relay coil, bakelite, an input port, an output port, a first winding connecting port, a second winding connecting port, a relay coil first access port and a relay coil second access port. The combined relay coil technology is adopted, miniaturization of the size of the differential mode inductor is achieved, the differential mode inductor has the advantages of being high in mechanical strength, low in cost and the like, meanwhile, bakelite beneficial to heat dissipation is introduced near the axis of the differential mode inductor, the heat dissipation performance is good, and in a word, the small differential mode inductor has the beneficial effects of being good in heat dissipation performance. The differential mode inductor can meet the design requirement of a small power electronic system, and can be applied to power electronic equipment such as a switching power supply, an inverter, a relay and a DC-DC converter.

Description

Technical Field

[0001] The invention belongs to the technical field of inductors, and relates to a small differential mode inductor, and in particular to a small differential mode inductor using a relay coil. Background Art

[0002] At present, traditional wound differential inductors are commonly used in industrial applications. The differential inductors are made by winding copper wire or other wires on a magnetic core or coreless. This method is applicable to various types of differential inductors and has a wide range of applications from low frequency to high frequency. Miniaturization of differential inductors is an important trend in the design of modern electronic devices, especially in portable devices, mobile communication devices and embedded systems. The miniaturization of differential inductors brings many challenges and opportunities. Among them, the following performance indicators need to be considered: 1. Winding density: Miniaturization requires increasing the number of winding coils in a limited space to achieve the required inductance value. This may lead to an increase in winding density, which may cause winding overlap and insulation problems. 2. Core material selection: Miniaturization requires the use of high-performance core materials to provide sufficient magnetic permeability and inductance value in a smaller volume. However, these materials may be more expensive or more difficult to process. 3. Thermal management: As the size decreases, the heat dissipation ability of the differential inductor becomes worse, which may cause excessive temperature rise and affect the performance and reliability of the differential inductor. Therefore, effective thermal management solutions need to be considered during design. 4. Parasitic parameters: Miniaturization may increase parasitic capacitance and parasitic resistance, which will affect the high-frequency performance of differential mode inductors. Sophisticated design and manufacturing processes are required to control these parasitic parameters. 5. Mechanical strength and reliability: Reducing size may affect the mechanical strength and long-term reliability of differential mode inductors, especially in vibration or shock environments. 6. Manufacturing tolerance: Miniaturization places higher demands on manufacturing accuracy, and smaller tolerances may lead to deviations in differential mode inductance values ​​and inconsistent performance. 7. Cost: The use of advanced materials and high-precision manufacturing technology will increase production costs. A balance needs to be found between performance and cost. 8. Automated production: Miniaturization may require new automated production technologies and equipment to ensure production efficiency and consistency. 9. Packaging technology: Miniaturization requires more advanced packaging technology to ensure that differential mode inductors can still provide good electrical and mechanical performance in a small volume. Therefore, it is a huge challenge to design a small differential mode inductor with high performance and low cost under limited size. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that, in view of the defects of the prior art of traditional wound differential mode inductors, a high-performance and low-cost small differential mode inductor using a relay coil is provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is to construct a small differential mode inductor using a relay coil, including: a first winding, a second winding, a magnetic core, a relay coil, bakelite, an input port, an output port, a first winding connection port, a second winding connection port, a first access port of the relay coil, and a second access port of the relay coil; the first winding and the second winding are both spirally wound on the magnetic core; one end of the first winding is the input port, and the first connector at the other end of the first winding is the first winding connection port connected to the first access port of the relay coil; one end of the second winding is the output port, and the first connector at the other end of the second winding is the second winding connection port connected to the second access port of the relay coil; the windings of the relay coil all pass through the bakelite, and the bakelite and the windings of the relay coil in the bakelite are divided into two and designed as a combined structure of a plug and a socket.

[0005] In the small differential mode inductor using a relay coil described in the present invention, the bakelite includes a bakelite upper part and a bakelite lower part, the bakelite upper part and the relay coil passing through the bakelite upper part constitute a plug; the bakelite lower part and the relay coil passing through the bakelite lower part constitute a socket.

[0006] In the small differential mode inductor using a relay coil described in the present invention, the relay coil passing through the upper part of the bakelite is convex; the relay coil passing through the lower part of the bakelite is concave; the upper part of the bakelite and the lower part of the bakelite are combined so that after the socket and the plug are adapted, the relay coil passing through the upper part of the bakelite is connected to the winding of the relay coil passing through the upper part of the bakelite.

[0007] In the small differential mode inductor using a relay coil described in the present invention, the winding ends of the entire relay coil formed by combining the upper bakelite portion and the lower bakelite portion are respectively the first access port of the relay coil and the second access port of the relay coil.

[0008] In the small differential mode inductor using a relay coil described in the present invention, the relay coil includes six turns of winding.

[0009] In the small differential mode inductor using a relay coil described in the present invention, the relay coil is made of the same material as the first winding and the second winding; the magnetic core is made of ferrite, and the bakelite is an insulating and heat-dissipating material.

[0010] In the small differential mode inductor using a relay coil described in the present invention, the relay coil makes full use of the space near the axis of the differential mode inductor. When it is inconvenient for the winding machine to wind near the axis and without increasing the extra size, the number of winding turns near the axis of the differential mode inductor is increased by the relay coil, thereby increasing the inductance and realizing the miniaturization of the differential mode inductor.

[0011] In the small differential mode inductor using a relay coil described in the present invention, the present invention not only realizes the miniaturization of the differential mode inductor size, but also has the advantages of high mechanical strength, low cost, etc. At the same time, since bakelite that is conducive to heat dissipation is introduced near the axis of the differential mode inductor, good heat dissipation performance is also a beneficial effect of the small differential mode inductor. In short, the differential mode inductor can meet the design requirements of small power electronic systems and can be applied to power electronic equipment such as switching power supplies, inverters, relays and DC-DC converters. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0013] Figure 1 This is a top view of the differential mode inductor before the relay coil is introduced;

[0014] Figure 2 A top view of a relay coil according to the present invention;

[0015] Figure 3 A three-dimensional view of a relay coil according to the present invention;

[0016] Figure 4 A cross-sectional view of a relay coil according to the present invention;

[0017] Figure 5 It is a top view of a complete small differential mode inductor using a relay coil according to the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to realize a small differential mode inductor using a relay coil, the present invention adopts a combined relay coil technology, and its specific design principle is as follows:

[0020] 1. The principle of miniaturization of differential mode inductors achieved by combined relay coil technology.

[0021] The present invention is aimed at the existing winding differential mode inductor. When the winding machine is inconvenient to wind near the center axis of the differential mode inductor, the combined relay coil technology is adopted to fully utilize the redundant space near the center axis to increase the number of winding coils. Figure 1 As shown in the figure, for the differential mode inductance before the relay coil is introduced, there is space left at the upper fan-shaped position and the central axis position in the figure. The present invention uses these two spaces to place the combined relay coil. Figure 2 As shown, for Figure 1At the upper middle sector position and the center axis position, 6 turns of relay coil are wound on the magnetic core. At the same time, the relay coil passes through the bakelite at the center axis position. The overall inductance increases by (n+6) compared to the inductance value before the introduction of the relay coil. 2 / n 2 times, where n is the number of windings of the differential mode inductor before the relay coil is introduced. That is to say, without increasing the external dimensions of the differential mode inductor, the differential mode inductor is increased, which is equivalent to miniaturizing the differential mode inductor. Figure 3 and Figure 4 As shown, in order to facilitate assembly, the bakelite at the center axis position and the winding inside it are divided into two parts and designed into a plug and socket structure. The 6 turns of winding passing through the bakelite in the figure are broken into two parts, which are respectively used to realize the plug and socket connected to the two sections of bakelite. During the production process, the 6 turns of winding passing through the bakelite can be marked with colors to prevent mis-insertion.

[0022] The purpose of the present invention is to overcome the shortcomings of the prior art - when it is inconvenient for a winding machine to wind near the center axis of a differential mode inductor, by adopting a combined relay coil technology, the redundant space near the center axis is fully utilized to increase the number of winding coils, thereby achieving miniaturization of the wound differential mode inductor.

[0023] The present invention not only realizes a small-sized winding differential mode inductor, but also facilitates assembly, which is also a beneficial effect of the differential mode inductor. The winding differential mode inductor is a new solution that combines the advantages of miniaturization and easy assembly, and can be applied to power electronic equipment such as switching power supplies, inverters, relays and DC-DC converters.

[0024] The present invention will be further described below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to be limiting to the present invention.

[0025] In order to clearly describe the present invention, Figure 5 It is a top view of a complete small differential mode inductor using a relay coil proposed by the present invention, a small differential mode inductor using a relay coil, comprising: a first winding 1, a second winding 2, a magnetic core 3, a relay coil 4, bakelite 5, an input port 1a, an output port 2a, a first winding connection port 1b, a second winding connection port 2b, a first access port 4a of the relay coil, and a second access port 4b of the relay coil.

[0026] The first winding 1 and the second winding 2 are both spirally wound on the magnetic core 3; one end of the first winding 1 is an input port 1a, and the other end connector is a first winding connection port 1b connected to the first access port 4a of the relay coil; one end of the second winding is an output port 2a, and the other end connector is a second winding connection port 2b connected to the second access port 4b of the relay coil; the windings in the relay coil all pass through the bakelite 5, and the bakelite 5 and the windings therein are divided into two and designed as a combined structure of a plug and a socket.

[0027] Furthermore, the internal condition of the relay coil 4 before assembly is as follows: Figure 3 As shown, it reflects the state of the plug and the socket before assembly. Before the relay coil 4 is assembled, the bakelite 5 is divided into two parts: the upper bakelite part 5a and the lower bakelite part 5b. The upper bakelite part 5a and the 6 turns of convex relay wire passing through it constitute the plug, and the lower bakelite part 5b and the 6 turns of concave relay wire passing through it constitute the socket. When the plug and the socket are disconnected, it is convenient to install the relay coil 4 into the differential mode inductor.

[0028] Furthermore, the internal condition of the relay coil 4 after assembly is as follows: Figure 4 As shown, it reflects the state of the plug and the socket after assembly. After the relay coil 4 is combined, since the plug and the socket are adapted, the windings in the plug and the socket bakelite are all in a connected state, and the 6-turn convex relay wire is just inserted into the 6-turn concave relay wire.

[0029] Further, when the plug and socket are assembled, return to Figure 5 , just connect the first access port 4a of the relay coil to the first winding connection port 1b, and connect the second access port 4b of the relay coil to the second winding connection port 2b, and the entire differential mode inductor can work normally.

[0030] The relay coil implemented according to the above embodiment needs to be processed into plug and socket shapes separately according to the size of the differential mode inductor. The material of the relay coil 4 is the same as the material of the first winding 1 and the second winding 2 of the wound differential mode inductor. The magnetic core 3 is made of ferrite, and the bakelite 5 is made of insulating and heat-dissipating phenolic plastic.

[0031] The small differential mode inductor using a relay coil in the embodiment of the present invention has good size advantages and easy assembly characteristics. The differential mode inductor can meet the design requirements of small power electronic systems and can be applied to power electronic devices such as switching power supplies, inverters, relays and DC-DC converters, and is worthy of promotion. The present invention includes but is not limited to the above-mentioned implementation schemes. Under the conception of the present invention, those skilled in the art can make different deformations and substitutions without departing from the principle of the present invention, such as the position of the relay coil, changing the annular magnetic core to other shapes, and using other metal or plastic materials. These deformations and substitutions also fall within the scope of protection of this patent.

[0032] Although the present invention is described by specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods falling within the scope of the claims of the present invention.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small differential mode inductor using a relay coil, characterized in that: include: A first winding, a second winding, a magnetic core, a relay coil, bakelite, an input port, an output port, a first winding connection port, a second winding connection port, a first access port for the relay coil, and a second access port for the relay coil; the first winding and the second winding are both spirally wound on the magnetic core; one end of the first winding is the input port, and the first connector at the other end of the first winding is the first winding connection port connected to the first access port of the relay coil; one end of the second winding is the output port, and the first connector at the other end of the second winding is the second winding connection port connected to the second access port of the relay coil; the windings of the relay coil all pass through the bakelite, and the bakelite and the windings of the relay coil in the bakelite are divided into two and designed as a combination structure of a plug and a socket.

2. The small differential mode inductor using a relay coil according to claim 1, characterized in that: The bakelite comprises a bakelite upper part and a bakelite lower part. The bakelite upper part and a relay coil passing through the bakelite upper part constitute a plug; and the bakelite lower part and the relay coil passing through the bakelite lower part constitute a socket.

3. The small differential mode inductor using a relay coil according to claim 2, characterized in that: The relay coil passing through the upper part of the bakelite is convex; the relay coil passing through the lower part of the bakelite is concave; the upper part of the bakelite and the lower part of the bakelite are combined so that after the socket and the plug are adapted, the relay coil passing through the upper part of the bakelite is connected to the winding of the relay coil passing through the upper part of the bakelite.

4. The small differential mode inductor using a relay coil according to claim 3, characterized in that: The winding ends of the entire relay coil formed by combining the bakelite upper part and the bakelite lower part are respectively the first access port of the relay coil and the second access port of the relay coil.

5. The small differential mode inductor using a relay coil according to claim 4, characterized in that: The repeater coil includes at least six turns of winding wire.

6. The small differential mode inductor using a relay coil according to claim 4, characterized in that: The relay coil is made of the same material as the first winding and the second winding; the magnetic core is made of ferrite, and the bakelite is made of insulating and heat-dissipating material.

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