JP2023101878A - Power charging and supplying unit - Google Patents

Abstract

To provide a power charging and supplying unit capable of suppressing noise from being outputted from an input part due to a magnetic field generated in the circumference of a fastening member.SOLUTION: A power charging and supplying unit 1 comprises: an input filter circuit; a housing 20 that supports a substrate; an input part 30 connected to an input filter circuit; a shield member 40 covering the input filter circuit; and fixing members 50. The fixing member 50 includes: a first fastening member 51; and a second fastening member 52. The first fastening member 51 is provided at a position where a magnetic field crossing the input part 30 when a current flows into the first fastening member 51 is formed. The second fastening member 52 is provided at a position where the magnetic field not crossing the input part 30 when the current flows into the second fastening member 52 is formed. A distance between the input part 30 and the first fastening member 51 is longer than a distance between the input part 30 and the second fastening member 52.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to charging and powering units.

2. Description of the Related Art Conventionally, a charging/feeding unit mounted on a vehicle or the like is known. For example, Japanese Unexamined Patent Application Publication No. 2019-75917 discloses a power converter that includes components that form an input filter circuit section and a case that has a housing section that houses the components. Components constituting the input filter circuit section are shielded by the housing section. As a result, the outflow of noise to the outside is suppressed.

JP 2019-75917 A

To solve the problem that noise emitted from internal components is superimposed on the input filter circuit, it is conceivable to cover the input filter circuit with a shield member.

However, the noise blocked by the shield member travels through the shield member as an eddy current and flows to the fastening member that fastens the shield member to the housing, and radiation noise may be generated from the fastening member. In this case, since a magnetic field is formed around the fastening member, noise caused by the magnetic field may leak from the input section to the input system side as conduction noise.

An object of the present disclosure is to provide a charging/feeding unit capable of suppressing noise output from an input section due to a magnetic field generated around a fastening member.

A charging/feeding unit according to one aspect of the present disclosure includes: an input filter circuit including a substrate and filter components mounted on the substrate; a housing that supports the substrate; an input unit connected to the input filter circuit; a shield member that covers the input filter circuit; wherein the first fastening member is provided at a position where a magnetic field that traverses the input portion is generated when current flows through the first fastening member, the second fastening member is provided at a position where a magnetic field that does not traverse the input portion is generated when current flows through the second fastening member, and a distance between the input portion and the first fastening member is greater than a distance between the input portion and the second fastening member.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a charging/feeding unit capable of suppressing noise output from an input section due to a magnetic field generated around a fastening member.

FIG. 2 is a plan view schematically showing part of the charging and feeding unit of one embodiment of the present disclosure; FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1; It is a figure which shows roughly the positional relationship of an input part and a fixed member.

Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

FIG. 1 is a plan view schematically showing part of a charging/feeding unit according to an embodiment of the present disclosure; FIG. FIG. 2 is a cross-sectional view along line II-II in FIG. This charging/power supply unit 1 is mounted on a vehicle, for example.

As shown in FIGS. 1 and 2, the charging/feeding unit 1 includes an input filter circuit 10, a housing 20, an input section 30, a shield member 40, a fixing member 50, and an electronic component 60.

The input filter circuit 10 has a substrate 11 and filter components 12 . As shown in FIG. 2, the filter component 12 is mounted on the bottom surface of the substrate 11, for example.

The housing 20 supports the board 11 . The housing 20 is made of metal. As shown in FIG. 2, the substrate 11 is fixed to the housing 20 by fastening members such as screws.

The input section 30 is connected to the substrate 11 of the input filter circuit 10 . The input section 30 has a pair of busbars 31 and a connection port 32 .

Each bus bar 31 is electrically connected to a circuit pattern (not shown) formed on the substrate 11 . One of the pair of bus bars 31 is a positive electrode and the other is a negative electrode.

The connection port 32 surrounds the pair of busbars 31 collectively. The connection port 32 is fixed to the side surface of the housing 20 .

The electronic component 60 is arranged inside the housing 20 . Examples of the electronic component 60 include transformers, coils, power elements, and the like. Radiation noise is emitted from the electronic component 60 .

The shield member 40 protects the input filter circuit 10 from noise. A shield member 40 covers the input filter circuit 10 . The shield member 40 is made of metal (such as iron).

The fixing member 50 is a member for fixing the shield member 40 to the housing 20 . The fixing member 50 includes a first fastening member 51 and a second fastening member 52 . A screw or the like is used as each of the fastening members 51 and 52 . The first fastening member 51 is provided at a position spaced apart from the input section 30 . The second fastening member 52 is provided at a position spaced apart from both the input portion 30 and the first fastening member 51 .

In the present embodiment, the noise emitted from the electronic component 60 is blocked by the shield member 40, thereby preventing it from reaching the input filter circuit 10. On the other hand, the noise may propagate through the shield member 40 as eddy currents and reach the fastening members 51 and 52. In this case, a magnetic field can be formed around each fastening member 51 , 52 . When this magnetic field crosses the input section 30, there is a concern that conduction noise may be output from the bus bar 31 to the input system side.

As shown in FIG. 3 , the first fastening member 51 is provided at a position where a magnetic field M1 that traverses the input section 30 is formed when current flows through the first fastening member 51 . A magnetic field M1 traverses between the pair of busbars 31 .

The second fastening member 52 is provided at a position where a magnetic field M2 that does not traverse the input section 30 is formed when current flows through the second fastening member 52 . In FIG. 3, the currents flowing through the first fastening member 51 and the second fastening member 52 are indicated by oblique lines.

In this embodiment, the distance X between the input part 30 and the first fastening member 51 is set larger than the distance Y between the input part 30 and the second fastening member 2 . Note that the distance X is the length between the center of the pair of busbars 31 and the center of the first fastening member 51 . A distance Y is the length between the center of the pair of busbars 31 and the center of the second fastening 2 .

As described above, in the charging/power supply unit 1 of the present embodiment, the distance X between the first fastening member 51 and the input portion 30, which causes the formation of the magnetic field M1, is greater than the distance Y between the second fastening member 52 and the input portion 30, which causes the formation of the magnetic field M2. Therefore, noise output from the input portion 30 due to the magnetic field M1 is suppressed.

It will be appreciated by those skilled in the art that the exemplary embodiments described above are specific examples of the following aspects.

The charging/power supply unit in the above embodiment includes: an input filter circuit including a substrate and filter components mounted on the substrate; a housing that supports the substrate; an input section connected to the input filter circuit; a shield member that covers the input filter circuit; and a plurality of fixing members for fixing the shield member to the housing. 2 fixing members, wherein the first fixing member is provided at a position where a magnetic field that traverses the input section is formed when a current flows through the first fixing member, the second fixing member is provided at a position where a magnetic field that does not traverse the input section is formed when a current flows through the second fixing member, and the distance between the input section and the first fixing member is greater than the distance between the input section and the second fixing member.

In this charging/power supply unit, the distance between the input section and the first fastening member is greater than the distance between the input section and the second fastening member, so that noise output from the input section due to the magnetic field generated when current flows through the first fastening member is suppressed.

It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

1 charging/feeding unit, 10 filter circuit, 11 substrate, 12 filter component, 20 housing, 30 input unit, 31 bus bar, 32 connection port, 40 shield member, 50 fixing member, 51 first fastening member, 52 second fastening member, 60 electronic component.

Claims (1)

an input filter circuit including a substrate and filter components mounted on the substrate;
a housing that supports the substrate;
an input unit connected to the input filter circuit;
a shield member covering the input filter circuit;
a fixing member for fixing the shield member to the housing,
The fixing member is
a first fastening member provided at a position spaced apart from the input section;
a second fastening member provided at a position spaced apart from both the input portion and the first fastening member;
The first fastening member is provided at a position where a magnetic field is formed across the input portion when a current flows through the first fastening member,
The second fastening member is provided at a position where a magnetic field that does not traverse the input portion is formed when a current flows through the second fastening member,
The charging and power supply unit, wherein the distance between the input section and the first fastening member is greater than the distance between the input section and the second fastening member.

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