EP3190596A1

EP3190596A1 - Built-in base for high-frequency electromagnetic induction element and high-frequency electromagnetic induction element

Info

Publication number: EP3190596A1
Application number: EP15838766.2A
Authority: EP
Inventors: Hui Li; Yijie CEN
Original assignee: TRAFTOR Tech (SHENZHEN) CO Ltd
Current assignee: TRAFTOR Tech (SHENZHEN) CO Ltd
Priority date: 2014-09-03
Filing date: 2015-03-26
Publication date: 2017-07-12
Also published as: EP3190596A4; WO2016033961A1

Abstract

The present disclosure provides a high-frequency electromagnetic sensor, including a magnetic core, a winding and a built-in base. A disc of the built-in base is built in the high-frequency electromagnetic sensor, and bound to the magnetic core via the winding. A plurality of legs of the built-in base is connected to the disc and extends out of the high-frequency electromagnetic sensor, so as to be supported on a carrier. Because the disc of the built-in base is built in the high-frequency electromagnetic sensor and bound to the magnetic core via the winding, the built-in base is capable of being fixed firmly to, and being formed integrally with, the magnetic core, so as to ensure the connection between the built-in base and the magnetic core even in the case that the high-frequency vibration occurs for the high-frequency electromagnetic sensor. In addition, it is able to fix the high-frequency electromagnetic sensor using the built-in base with a simple structure, thereby to improve the dissipation effect and reduce the manufacture cost.

Description

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priorities of the Chinese Patent Applications No. 201410447362.5 filed on September 3, 2014 and No. 201420507331 .X filed on September 3, 2014, which are incorporated herein by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to a fixation structure for a high-frequency electromagnetic sensor, in particular to a built-in base for the high-frequency electromagnetic sensor, and the high-frequency electromagnetic sensor.

BACKGROUND

Inducer (induction coil) and transformer, as commonly-used elements in an electronic circuit, are both electromagnetic sensors manufactured by winding an insulated wire (e.g., an enameled wire or a cotton-covered wire). In the related art, these electromagnetic sensors may usually be installed in the following modes.
Mode 1: a via-hole may be formed in an insulation plate of a base carrying the electromagnetic sensor, and a pin of the electromagnetic sensor may directly pass through the via-hole. Next, an adhesive (usually epoxy resin) may be provided between the pin and the base, and a portion of the pin extending out of the via-hole may be welded onto a circuit board below the electromagnetic sensor, so as to fix the electromagnetic sensor.
Mode 2: the inducer or transformer may be bound onto an insulation base plate through a steel belt, and insulation paper may be provided between the coil and the steel belt, so as to enable them to be electrically insulated from each other. In the case that the base plate is made of metal, an insulation plate needs to be provided between the winding and the base plate.
Mode 3: the electromagnetic sensor may be fixed through a hook. The inducer or transformer may be placed horizontally on the base, and then drawn toward the base vertically by the hook. One end of the hook may be threaded and thus fixed onto the base through a screw.
Mode 4: the inducer or transformer may be placed within a closed cabinet, and then completely encapsulated within the cabinet in a filling-sealing manner, so as to fix it.
However, there are the following defects in the above-mentioned modes. Mode 1 is merely adapted to the small-power inducer or transformer. During the welding, the adhesive for fixation may easily be melted due to a high temperature, and the inducer or transformer may rise and thus cannot be fixed firmly. During the operation, vibration and noises may occur due to a high-frequency signal. In addition, after long-term operation, the inducer or transformer may fail to be fixed onto the circuit board.
Mode 2 is adapted to the small-power, moderate-power or large-power inducer or transformer. In the case that the steel belt is adopted, a large amount of insulation materials may be used, so as to provide a sufficient electrical clearance and a sufficient creep distance. In addition, due to the mechanical fixation using the steel belt and the high-frequency vibration during the operation, there is a risk that the fixation may fail after the long-term operation.
Mode 3 is mainly used for the moderate-power or large-power inducer or transformer. Similar to Mode 2, a large amount of insulation materials need to be used, so as to ensure the electrical clearance and the creep distance. Further, different hooks need to be designed for the inducers or transformers of various types, resulting in an increase in the manufacture cost. In addition, the hook is fastened via a screw, and it may become loosen due to the high-frequency vibration during the operation, so there is also a risk that the fixation may fail.
In Mode 4 where the inducer or transformer is encapsulated within the cabinet in a filling-sealing manner, it is difficult for the inducer or transformer to dissipate, and meanwhile the manufacture cost is very high.
As mentioned above, Modes 1 to 3 are not suitable for the high-frequency electromagnetic sensor, because the fixation way may become loosen or even fail due to the high-frequency vibration. Mode 4 is too expensive, although it is suitable for the high-frequency electromagnetic sensor.

SUMMARY

An object of the present disclosure is to provide an effective fixation way for the high-frequency electromagnetic sensor while reducing the manufacture cost.
In one aspect, the present disclosure provides in some embodiments a built-in base for a high-frequency electromagnetic sensor, including a disc built in the high-frequency electromagnetic sensor in use and bound to a magnetic core via a winding. A plurality of legs is connected to the disc in such a manner as to extend out of the high-frequency electromagnetic sensor in use and support the disc.
In a possible embodiment of the present disclosure, the built-in base is made of a non-metal material. Through the non-conductive material, it is able to prevent the occurrence of the vibration of the built-in base due to the electromagnetic induction, thereby to prevent the additional loss.
In a possible embodiment of the present disclosure, in the case that the disc is supported by the plurality of legs, the plurality of legs is arranged evenly and connected to the disc, so as to apply an equal force to the disc and support the disc firmly.
In a possible embodiment of the present disclosure, the disc is of a ring shape.
In a possible embodiment of the present disclosure, each leg is provided with a connection member, and the connection member includes a screw hole, a via-hole or a fastener.
In a possible embodiment of the present disclosure, the disc and the plurality of legs are of an integrally-formed structure.
In another aspect, the present disclosure provides in some embodiments a high-frequency electromagnetic sensor including a magnetic core, a winding and a built-in base. A disc of the built-in base is built in the high-frequency electromagnetic sensor, and bound to the magnetic core via the winding. A plurality of legs of the built-in base is connected to the disc and extends out of the high-frequency electromagnetic sensor, so as to be supported on a carrier.
In a possible embodiment of the present disclosure, apart from being bound to the magnetic core via the winding, the disc is further fixed to the magnetic core through an adhesive or a screw, so as to improve the connection strength between the built-in base and the magnetic core, thereby to improve the integrity of the built-in base and the high-frequency electromagnetic sensor.
In a possible embodiment of the present disclosure, the disc of the built-in base is integrally formed with the plurality of legs, so as to further improve the integrity of the built-in base and the high-frequency electromagnetic sensor.
In a possible embodiment of the present disclosure, the built-in base is made of a non-metal material. Through the non-conductive material, it is able to prevent the occurrence of vibration of the built-in base due to the electromagnetic induction, thereby to prevent the additional loss. To be specific, the built-in base may be made of engineering plastics, so as to meet the requirement of insulation property and the requirement of mechanical strength.
In a possible embodiment of the present disclosure, in the case that the disc is supported by the plurality of legs, the plurality of legs is arranged evenly and connected to the disc, so as to apply an equal force to the disc and support the disc firmly.
In a possible embodiment of the present disclosure, a height of each leg is set in such a manner as to provide a predetermined electrical clearance and a predetermined creep distance between the winding and the carrier.
According to the built-in base for the high-frequency electromagnetic sensor and the high-frequency electromagnetic sensor in the embodiments of the present disclosure, the disc of the built-in base is built in the high-frequency electromagnetic sensor and bound to the magnetic core via the winding. In this way, the built-in base is capable of being fixed firmly to, and being formed integrally with, the magnetic core. As compared with the conventional mechanical connection mode, it is able to ensure the connection between the built-in base and the magnetic core even in the case that the high-frequency vibration occurs for the high-frequency electromagnetic sensor, thereby to remarkably improve the fixation of the high-frequency electromagnetic sensor. In addition, as compared with the conventional fixation mode using a cabinet, it is able to fix the high-frequency electromagnetic sensor using the built-in base with a simple structure, thereby to improve the dissipation effect and reduce the manufacture cost.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig.1 is a solid view of a high-frequency electromagnetic sensor according to one embodiment of the present disclosure;
Fig.2 is a side view of the high-frequency electromagnetic sensor in Fig.1 in a first direction;
Fig.3 is another side view of the high-frequency electromagnetic sensor in Fig.1 in a second direction perpendicular to the first direction;
Fig.4 is a top view of the high-frequency electromagnetic sensor in Fig.1;
Fig.5 is a solid view of a built-in base for the high-frequency electromagnetic sensor according to one embodiment of the present disclosure; and
Fig.6 is a planar view of the built-in base in Fig.5.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure will be described hereinafter in conjunction with the drawings and embodiments. The following embodiments are for illustrative purposes only, but shall not be used to limit the scope of the present disclosure.
As shown in Figs.1 to 4, the present disclosure provides in some embodiments a high-frequency electromagnetic sensor 1, which includes a magnetic core, a winding (an interior structure thereof is not shown), and a built-in base 2. As shown in Figs.5 and 6, the built-in base 2 includes a disc 21 and a plurality of legs 22. The disc 21 of the built-in base 2 is built in the high-frequency electromagnetic sensor 1, and bound to the magnetic core via the winding. The plurality of legs 22 of the built-in base 2 is connected to the disc 21 and extends out of the high-frequency electromagnetic sensor 1, so as to be supported on a carrier. To be specific, during the installation, the disc 21 may be aligned with the magnetic core, and then a coil may be wound onto the disc 21 and the magnetic core so as to form the winding, thereby to bind the disc 21 to the magnetic core via the winding.
According to the embodiments of the present disclosure, the disc 21 of the built-in base 2 is built in the high-frequency electromagnetic sensor 1 and bound to the magnetic core via the winding. In this way, the built-in base 2 is capable of being fixed firmly to, and being formed integrally with, the magnetic core. As compared with the conventional mechanical connection mode, it is able to ensure the connection between the built-in base 2 and the magnetic core even in the case that the high-frequency vibration occurs for the high-frequency electromagnetic sensor 1, thereby to remarkably improve the fixation of the high-frequency electromagnetic sensor 1. In addition, as compared with the conventional fixation mode using a cabinet, it is able to fix the high-frequency electromagnetic sensor 1 using the built-in base with a simple structure, thereby to improve the dissipation effect and reduce the manufacture cost.
It should be appreciated that, in the embodiments of the present disclosure, the electromagnetic sensor includes any element operating in accordance with an electromagnetic induction principle, e.g., an inducer or a transformer. The high-frequency electromagnetic sensor refers to an electromagnetic sensor operating at a frequency greater than an intermediate frequency (10kHz), e.g., a high-frequency transformer. The high-frequency transformer is mainly used for a high-frequency switching power source, a high-frequency inverter or a high-frequency inverter welding machine. Depending on the operating frequency, the high frequency may be divided into the following groups: 10kHz-50kHz, 50kHz-100kHz, 100kHz-500kHz, 500kHz-1MHz, and frequencies greater than 1MHz. During the electromagnetic induction, usually the vibration may occur for the high-frequency electromagnetic sensor, significantly severer than the vibration occurring for the intermediate-frequency or low-frequency electromagnetic sensor.
It should be further appreciated that, in the embodiments of the present disclosure, the above description is given by taking a ring-shaped inducer or transformer operating at a high frequency as an example, so the disc 21 of the built-in base 2 may also be of a ring shape. However, the disc 21 is not limited to this shape, and it may be provided in any other form in accordance with the practical need.
In a possible embodiment of the present disclosure, apart from being bound to the magnetic core via the winding, the disc 21 may be further fixed to the magnetic core through an adhesive or a screw, so as to further improve the strength of the connection between the built-in base 2 and the magnetic core, thereby to improve the integrity of the built-in base 2 and the high-frequency electromagnetic sensor. In this way, in the case of the high-frequency vibration occurring for the high-frequency electromagnetic sensor, it is able to fix the high-frequency electromagnetic sensor in a better manner. Specifically, to simplify the operation, the disc 21 may be adhered to the magnetic core through an adhesive tape, then the disc 21 may be bound to the magnetic core via the winding, and then the built-in base 2, the winding and the magnetic core may be subjected to vacuum impregnation so as to improve the strength.
In another possible embodiment of the present disclosure, in order to further improve the integrity of the built-in base 2 and the high-frequency electromagnetic sensor 1 and improve the fixation, the disc 21 of the built-in base 2 and the plurality of legs 22 may be of an integrally-formed structure. In this way, no relative vibration may occur between the disc 21 and the plurality of the legs 22.
In the embodiments of the present disclosure, the built-in base 2 may be made of a non-metal material. Through the non-conductive material, it is able to prevent the occurrence of the vibration for the built-in base 2 during the electromagnetic induction, thereby to prevent the additional loss. To be specific, the built-in base 2 may be made of engineering plastics, so as to meet the requirement of insulation property and the requirement of mechanical strength. In addition, in the case that the engineering plastics are used, the built-in base may be formed by injection molding.
As shown in Figs.5 and 6, in the case that the disc 21 is supported by the plurality of legs 22, the plurality of legs 22 may be arranged evenly and connected to the disc 21, so as to apply an equal force to the disc 21 and support the disc 21 firmly. In other words, the plurality of legs 22 may be arranged evenly on the disc 21. Figs.5 and 6 each show four legs 22, but the number of the legs 22 is not particularly defined herein. For example, two, three, five or more legs may be provided. In a possible embodiment of the present disclosure, three legs are provided. This is because, in accordance with the principle that a plane is determined by three points not in an identical line, it is able to ensure, through the three legs 22, the flatness of the high-frequency electromagnetic sensor in the case that the built-in base 2 is installed at any position on the carrier.
In order to facilitate the installation of the built-in base 2 onto the carrier, the plurality of legs 22 is each provided with a connection member connected to the carrier. For example, the connection member may be a screw hole, a via-hole or a clip. Here, the carrier may be a circuit board or the ground.
In addition, in use, a height of each leg 22 may be set in such a manner as to provide a sufficient electrical clearance and a sufficient creep distance between the winding and the carrier, thereby to reduce the amount of the insulation material.
As shown in Figs.5 and 6, the present disclosure further provides in some embodiments the built-in base 2 for the high-frequency electromagnetic sensor, which includes the disc 21 built in the high-frequency electromagnetic sensor and bound to the magnetic core via the winding when in use. The plurality of legs 22 is connected to the disc 21 in such a manner as to extend out of the high-frequency electromagnetic sensor in use and support the disc 21.
In Figs.5 and 6, the built-in base 2 is made of a non-metal material. Through the non-conductive material, it is able to prevent the occurrence of the vibration for the built-in base during the electromagnetic induction, thereby to prevent the additional loss. In addition, in the case that the disc 21 is supported by the plurality of legs 22, the plurality of legs 22 may be arranged evenly and connected to the disc 21, so as to apply an equal force to the disc 21 and support the disc 21 firmly.
It should be appreciated that, the structure and function of the built-in base 2 are identical to those mentioned above, and thus will not be particularly defined herein. In addition, the built-in base 2 may also be used to solve the technical problem and achieve the technical effect identical to those mentioned above.
The above are merely the preferred embodiments of the present disclosure. Obviously, a person skilled in the art may make further modifications and improvements without departing from the spirit of the present disclosure, and these modifications and improvements shall also fall within the scope of the present disclosure.

Claims

A built-in base for a high-frequency electromagnetic sensor, comprising a disc built in the high-frequency electromagnetic sensor and bound to a magnetic core via a winding when the built-in base is in use, wherein a plurality of legs is connected to the disc in such a manner as to extend out of the high-frequency electromagnetic sensor and support the disc when the built-in base is in use.
The built-in base according to claim 1, wherein the built-in base is made of a non-metal material.
The built-in base according to claim 1 or 2, wherein the plurality of legs is arranged evenly and connected to the disc.
The built-in base according to claim 1 or 2, wherein the disc is of a ring shape.
The built-in base according to claim 1 or 2, wherein each leg is provided with a connection member, and the connection member comprises a screw hole, a via-hole or a clip.
The built-in base according to claim 1 or 2, wherein the disc and the plurality of legs are of an integrally-formed structure.
A high-frequency electromagnetic sensor, comprising a magnetic core, a winding and a built-in base, wherein
a disc of the built-in base is built in the high-frequency electromagnetic sensor and bound to the magnetic core via the winding; and
a plurality of legs of the built-in base is connected to the disc and extends out of the high-frequency electromagnetic sensor, so as to be supported on a carrier.
The high-frequency electromagnetic sensor according to claim 7, wherein apart from being bound to the magnetic core via the winding, the disc is further fixed to the magnetic core through an adhesive or a screw.
The high-frequency electromagnetic sensor according to claim 8, wherein the disc of the built-in base and the plurality of legs are of an integrally-formed structure.
The high-frequency electromagnetic sensor according to claim 7, 8 or 9, wherein the built-in base is made of a non-metal material.
The high-frequency electromagnetic sensor according to claim 10, wherein the built-in base is made of engineering plastics.
The high-frequency electromagnetic sensor according to claim 7, 8 or 9, wherein the plurality of legs is arranged evenly and connected to the disc.
The high-frequency electromagnetic sensor according to claim 12, wherein the plurality of legs each has a height sufficient to provide a predetermined electrical clearance and a predetermined creep distance between the winding and the carrier.
The high-frequency electromagnetic sensor according to any one of claims 7 to 9, wherein the disc is of a ring shape.
The high-frequency electromagnetic sensor according to any one of claims 7 to 9, wherein each leg is provided with a connection member connected to the carrier, and the connection member comprises a screw hole, a via-hole or a clip.