CN204190606U - A kind of current transformer electromagnetic interface filter - Google Patents

Abstract

The utility model discloses a kind of current transformer electromagnetic interface filter, comprise magnet ring and the electric capacity mounting panel being laid with capacitance component, described magnet ring adopts insulated leg to fix and carries out encapsulation formation magnet ring encapsulating structure, and this magnet ring encapsulating structure is provided with the electrical connector for overlapping with current transformer; Described electric capacity mounting panel is provided with the binding post for being connected with magnet ring encapsulating structure.The utility model current transformer electromagnetic interface filter adopts magnet ring+electric capacity mounting plates structure, magnet ring uses insulated leg to fix, the outside structural member that uses encapsulates, it is outside that electric capacity mounting panel is placed in electromagnetic interface filter encapsulating structure, use the terminal mode of connection to be connected with the magnet ring encapsulating structure of filter, to be convenient for changing and current transformer runs on-the-spot after-sales service.The structure of this filter is simple, reduces the cost of current transformer simultaneously.

Description

An EMI filter for a converter

technical field

The utility model relates to an EMI filter for a converter.

Background technique

The EMI filter is usually a low-pass filter circuit composed of a series inductor and a parallel capacitor. Its function is to allow the frequency signal to enter the device when the device is working normally, and has a greater hindrance to the high-frequency interference signal. Magnetic ring filter and common mode inductor are EMI devices, mainly used for high-frequency filtering, and are the main accessories of various switching power supplies. The magnetic ring filter has high reliability, large inductance range and high rated current. The structure of the existing EMI filter is relatively complicated. According to the market demand and the requirement of reducing the cost of the converter, the structure of the EMI filter of the converter needs to be simplified.

Utility model content

The purpose of the utility model is to provide an EMI filter for a converter to reduce the cost of the converter and simplify the structure of the filter.

In order to achieve the above objectives, the technical solution adopted by the utility model is: an EMI filter for a converter, including a magnetic ring and a capacitor mounting plate with capacitor components, the magnetic ring is fixed by an insulating support and packaged to form A magnetic ring packaging structure, the magnetic ring packaging structure is provided with electrical connectors for overlapping with the converter; the capacitor mounting plate is provided with terminals for connecting with the magnetic ring packaging structure.

The capacitor mounting board is fixed on the magnetic ring packaging structure through insulating pillars.

The electrical connector is an outgoing copper bar, and the outgoing copper bar is fixed inside the magnetic ring packaging structure through the copper bar support.

The filter is packaged externally with a metal plate.

The EMI filter for the converter of the present invention adopts the magnetic ring+capacitor mounting plate structure, the magnetic ring is fixed by an insulating support, and the external structure is packaged, the capacitor mounting plate is placed outside the EMI filter packaging structure, and the magnetic ring of the filter The packaging structure is connected by terminal wiring, which is convenient for replacement and after-sales maintenance of the inverter operation site. The structure of the filter is simple, while reducing the cost of the converter.

In addition, both the AC EMI filter and the DC EMI filter for the converter use outgoing copper bars to overlap the DC side and the AC side of the converter, which can be fully compatible with the existing structure of the converter panel.

Structural encapsulation on the outside of the filter can better protect the filter magnetic ring. At the same time, the outgoing copper bars inside the filter are fixed by copper bar supports, which can effectively prevent the EMI filter from being The magnetic ring or capacitor plate is damaged when the copper bar shakes.

Description of drawings

Figure 1 is a schematic diagram of an AC EMI filter;

Figure 2 is a schematic diagram of the capacitor plate of the AC EMI filter;

Figure 3 is a schematic diagram of a DC EMI filter;

Figure 4 is a schematic block diagram of a DC EMI capacitor plate;

Fig. 5 is a schematic structural diagram of a DC EMI filter;

Figure 6 is a fixed structural diagram of the magnetic ring and the capacitor plate.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is further introduced.

Figure 1 shows the schematic diagram of the AC EMI filter used in the converter. It can be seen from the figure that the filter adopts a two-stage filtering scheme and has a Y capacitor to the ground. Inductor L1A magnetic ring and L2A magnetic ring, X capacitor and Y capacitor form the AC end filter circuit of the converter.

Figure 3 shows the schematic diagram of the DC EMI filter used in the converter. It can be seen from the figure that the filter also adopts a two-stage filtering scheme, and there is no Y capacitor to the ground. The magnetic ring LA and the X capacitor form the filter circuit of the DC end of the converter.

Regardless of whether it is an AC EMI filter or a DC EMI filter, the capacitor assembly adopts a capacitor mounting plate structure. The capacitor mounting plate used in the AC EMI filter of this embodiment includes three parts: C1, C2, and C3, as shown in Figure 1 ; The capacitor mounting board used by the DC EMI filter includes two parts, C1 and C2, as shown in Figure 3.

As shown in Figure 6, the magnetic ring 1 is fixed by an insulating support 3 and packaged to form a magnetic ring packaging structure 2. The magnetic ring packaging structure 2 is provided with electrical connectors for overlapping with the converter; the capacitor mounting plate 4 There are connecting terminals for connecting with the magnetic ring package structure 2, such as the AC connecting terminals J1 and J2 in FIG. 2 and the DC connecting terminal J1 in FIG. 4 .

The capacitor mounting board 4 of this embodiment is fixed on the magnetic ring packaging structure 2 through insulating pillars 5 , as shown in FIG. 5 . The outgoing copper bar is fixed inside the magnetic ring packaging structure through the copper bar support.

In addition, the EMI filter for the converter is externally packaged with a metal plate (can be a stainless steel plate) for structural packaging, which can better protect the filter magnetic ring; at the same time, the electrical connector uses an outgoing copper bar, which is used inside the packaging structure The copper bar support is fixed, which can effectively avoid the damage of the magnetic ring or capacitor mounting plate due to the shaking of the copper bar during the lapping process of the corresponding EMI filter and the copper bar of the converter screen.

The above embodiments are only used to help understand the core idea of the utility model, and cannot limit the utility model with this. For those skilled in the art, any modification or equivalent replacement of the utility model according to the idea of the utility model shall be carried out in specific implementation. Any changes done in the manner and scope of application should be included in the protection scope of the present utility model.

Claims (4)

1. a current transformer electromagnetic interface filter, it is characterized in that: comprise magnet ring and the electric capacity mounting panel being laid with capacitance component, described magnet ring adopts insulated leg to fix and carries out encapsulation formation magnet ring encapsulating structure, and this magnet ring encapsulating structure is provided with the electrical connector for overlapping with current transformer; Described electric capacity mounting panel is provided with the binding post for being connected with magnet ring encapsulating structure.

2. current transformer electromagnetic interface filter according to claim 1, is characterized in that: described electric capacity mounting panel is fixed on magnet ring encapsulating structure by insulation column.

3. current transformer electromagnetic interface filter according to claim 1, is characterized in that: described electrical connector is outlet copper bar, and described outlet copper bar is fixed on the inside of magnet ring encapsulating structure by copper bar bearing.

4. the current transformer electromagnetic interface filter according to claims 1 to 3 any one, is characterized in that: this filter outside adopts metallic plate to encapsulate.