EMI filter

Abstract

The utility model belongs to the technical field of electromagnetic compatibility, and particularly discloses an EMI filter, which comprises a first phase input end, a second phase input end, a third phase input end, a first phase output end, a second phase output end, a third phase output end, capacitors Cx1, Cx2, Cx3, Cx4, Cx5 and Cx6, an inductor I, an inductor II, an inductor III and a connection relation thereof. According to the utility model, the capacitor bank in delta connection is designed, and the inductor adopts the amorphous magnetic ring, so that the high-frequency and low-frequency filtering performance is ensured, the influence of environment temperature is avoided, and the stability of the filtering performance is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic compatibility technology, and in particular to a multi-purpose board-level EMI filter for elevators. It is applied in high-speed elevators, medical elevators, passenger elevators and other fields where there are certain requirements for the installation inside the elevator control cabinet, in order to shield and suppress electromagnetic interference signals generated by power lines, traction machines and frequency converters. Background Technology

[0002] With the rapid development of the manufacturing industry, the application of elevators is becoming increasingly widespread, leading to higher standards for elevator speed, comfort, and safety. This, in turn, imposes stricter requirements on the electromagnetic compatibility (EMC) of the equipment system. During elevator operation, factors such as the ballast in the car lighting system generating high-frequency oscillating current, electromagnetic interference signals from the traction machine, and high-order harmonics generated by the frequency converter can all cause EMC problems. Furthermore, elevators have a chance of being struck by lightning during operation, which also places higher demands on the voltage withstand capability of the filters. Utility Model Content

[0003] The purpose of this invention is to solve the technical problems of electromagnetic interference signals generated by elevator traction machines, frequency converters, elevator control cabinet internal systems, and ballasts in the background art. To this end, an EMI filter is provided.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An EMI filter includes a first phase input terminal, a second phase input terminal, a third phase input terminal, a first phase output terminal, a second phase output terminal, and a third phase output terminal;

[0006] A capacitor C is electrically connected between the first phase input terminal and the second phase input terminal. x1 A capacitor C is electrically connected between the second phase input terminal and the third phase input terminal. x2 A capacitor C is electrically connected between the first phase input terminal and the third phase input terminal. x3 ;

[0007] A capacitor C is electrically connected between the first phase output terminal and the second phase output terminal. x4 A capacitor C is electrically connected between the second phase output terminal and the third phase output terminal. x5 A capacitor C is electrically connected between the first phase output terminal and the third phase output terminal. x6 ;

[0008] The first phase input terminal is electrically connected to one end of inductor one, and the other end of inductor one is electrically connected to the first phase output terminal. The second phase input terminal is electrically connected to one end of inductor two, and the other end of inductor two is electrically connected to the second phase output terminal. The third phase input terminal is electrically connected to one end of inductor three, and the other end of inductor three is electrically connected to the third phase output terminal.

[0009] The following is a further defined technical solution of this utility model: the first phase output terminal is electrically connected to capacitor C. y1 One end, capacitor C y1 The other end is grounded.

[0010] The following is a further defined technical solution of this utility model: the second phase output terminal is electrically connected to capacitor C. y2 One end, capacitor C y2 The other end is grounded.

[0011] The following is a further defined technical solution of this utility model: the third phase output terminal is electrically connected to capacitor C. y3 One end, capacitor C y3 The other end is grounded.

[0012] The following is a further defined technical solution of this utility model: the coils of inductor one, inductor two, and inductor three are all wound on the same magnetic ring.

[0013] Compared with the prior art, the present invention has the following technical effects:

[0014] This invention designs a delta-connected capacitor bank and uses an amorphous magnetic ring inductor to ensure high-frequency and low-frequency filtering performance. It is not affected by ambient temperature and ensures stable filtering performance. The grounding capacitor uses a Y2-grade safety film capacitor, which improves the overall voltage withstand rating of the filter.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the circuit connection diagram of this utility model;

[0018] Figure 2 This is a top view of the structure of this utility model.

[0019] Reference numerals: 1. First phase input terminal; 2. Second phase input terminal; 3. Third phase input terminal; 4. First phase output terminal; 5. Second phase output terminal; 6. Third phase output terminal; 7. Base; 8. Printed circuit board; 9. M3*8 integrated screw; 10. Double-hole connection terminal; 11. M5*8 integrated screw; 12. 1.0μF / X2 grade safety film capacitor; 13. Circular bare terminal; 14. 47nF / Y2 grade safety film capacitor; 15. Amorphous magnetic ring. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] like Figure 1 and 2 As shown, this embodiment provides a circuit structure and mechanical structure for an EMI filter.

[0024] like Figure 1 As shown, the circuit structure of an EMI filter includes a first phase input terminal 1, a second phase input terminal 2, a third phase input terminal 3, a first phase output terminal 4, a second phase output terminal 5, and a third phase output terminal 6.

[0025] A capacitor C is electrically connected between the first phase input terminal 1 and the second phase input terminal 2. x1 A capacitor C is electrically connected between the second phase input terminal 2 and the third phase input terminal 3. x2 A capacitor C is electrically connected between the first phase input terminal 1 and the third phase input terminal 3. x3 A capacitor C is electrically connected between the first phase output terminal 4 and the second phase output terminal 5. x4 A capacitor C is electrically connected between the second phase output terminal 5 and the third phase output terminal 6. x5 A capacitor C is electrically connected between the first phase output terminal 4 and the third phase output terminal 6. x6 .

[0026] The first phase input terminal 1 is electrically connected to one end of inductor 1, and the other end of inductor 1 is electrically connected to the first phase output terminal 4. The second phase input terminal 2 is electrically connected to one end of inductor 2, and the other end of inductor 2 is electrically connected to the second phase output terminal 5. The third phase input terminal 3 is electrically connected to one end of inductor 3, and the other end of inductor 3 is electrically connected to the third phase output terminal 6.

[0027] The first phase output terminal 4 is electrically connected to capacitor C. y1 One end, capacitor C y1 The other end is electrically connected to the ground terminal E. The second phase output terminal 5 is electrically connected to capacitor C. y2 One end, capacitor C y2 The other end is electrically connected to the ground terminal E. Capacitor C is electrically connected to the third phase output terminal 6. y3 One end, capacitor C y3 The other end is electrically connected to the ground terminal E. The coils of inductor one, inductor two, and inductor three are all wound on the same magnetic ring.

[0028] like Figure 2 As shown, the mechanical structure of an EMI filter includes a base 7, a printed circuit board 8, an M3*8 integrated screw 9, a dual-hole connection terminal 10, an M5*8 integrated screw 11, and a 1.0μF / X2 grade safety film capacitor 12 (i.e., capacitor C). x1 C x2 C x3 C x4 C x5 C x6 ), 13. Circular bare terminals, 14. 47nF / Y2 grade safety film capacitor (i.e., capacitor C) y1 C y2 C y3 ), amorphous magnetic ring 15.

[0029] First, solder the dual-hole connection terminal 10 to the corresponding position on the printed circuit board 8. Then, solder the 47nF / Y2 grade safety film capacitor 14 to the corresponding position on the printed circuit board 8 and trim off any excess leads. Finally, solder the 1.0μF / X2 grade safety film capacitor 12 to the corresponding position on the printed circuit board 8 and trim off any excess leads. Cut off any excess enameled wire from the wound and tinned amorphous magnetic ring 15 according to the hole spacing of the dual-hole connection terminals 10 on both sides. Crim the wire ends with a round bare terminal 13 and fill any gaps with tin. Use M... The M5*8 integrated screw 11 is used to fix the amorphous magnetic ring 15, which has been crimped to the circular bare terminal 13, onto the double-hole connection terminal 10. The other hole of the double-hole connection terminal 10 also needs to be installed with an M5*8 integrated screw 11 for client installation. The double-hole connection terminal 10, 1.0μF / X2 grade safety film capacitor 12, 47nF / Y2 grade safety film capacitor 14, and the fixed amorphous magnetic ring 15, which have been soldered on the printed circuit board 8, are installed onto the base 7 using an M3*8 integrated screw 9.

[0030] In this embodiment, the filter's input terminal INPUT (i.e., the first phase input terminal 1, the second phase input terminal 2, and the third phase input terminal 3) and output terminal OUTPUT (i.e., the first phase output terminal 4, the second phase output terminal 5, and the third phase output terminal 6) are both connected to the dual-hole connection terminal 10.

[0031] Printed circuit board 8 adopts a single-sided design. One side is copper-plated with solder pads and has green solder mask, while the other side is engraved with lettering and has no copper plating or solder pads. All components are placed on the engraved side to ensure the overall insulation performance of the filter. The dual-hole connection terminals are made of nickel-plated copper, ensuring conductivity and corrosion resistance, while also maintaining a certain level of aesthetics. The dual-hole design ensures coil fixation without affecting the installation of the client. Grounding capacitor (i.e., capacitor C) y1 C y2 C y3 Y2-grade safety film capacitors were selected to ensure the overall voltage withstand rating of the filter. Amorphous material was used for the inductor, which has a significant suppression effect on electromagnetic interference from components such as elevator traction machines and frequency converters.

[0032] Capacitor C x1 C x2 C x3 Using a delta connection, capacitor C x4 C x5 C x6 A delta connection is adopted; the magnetic ring is made of amorphous material, which has a significant suppression effect on both low-frequency and high-frequency interference.

[0033] Grounding capacitor (i.e., capacitor C) y1 C y2 C y3To meet the high voltage withstand requirements of the elevator industry, Y2-grade safety film capacitors were selected. Y2-grade safety film capacitors are used for common-mode grounding capacitors, effectively ensuring the voltage withstand level between the line and ground, greatly improving the overall voltage withstand level of the filter, and meeting the stringent high voltage withstand requirements of the elevator industry.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. An EMI filter, characterized by, The first phase input end, the second phase input end, the third phase input end, the first phase output end, the second phase output end and the third phase output end are provided. a capacitor C electrically connected between the first phase input and the second phase input x1 a capacitor C electrically connected between the second phase input and the third phase input x2 a capacitor C electrically connected between the first phase input and the third phase input x3 ; a capacitor C electrically connected between the first phase output and the second phase output x4 a capacitor C electrically connected between the second phase output and the third phase output x5 a capacitor C electrically connected between the first phase output and the third phase output x6 ; One end of the first inductor is electrically connected to the first phase input end, and the other end of the first inductor is electrically connected to the first phase output end; one end of the second inductor is electrically connected to the second phase input end, and the other end of the second inductor is electrically connected to the second phase output end; one end of the third inductor is electrically connected to the third phase input end, and the other end of the third inductor is electrically connected to the third phase output end.

2. An EMI filter as claimed in claim 1, wherein, The first phase output end is electrically connected with one end of a capacitor C y1 The other end of the capacitor C y1 is grounded.

3. An EMI filter as recited in claim 1, wherein, The second phase output end is electrically connected with one end of a capacitor C y2 The other end of the capacitor C y2 is grounded.

4. An EMI filter as recited in claim 1, wherein, The third phase output end is electrically connected with one end of a capacitor C y3 The other end of the capacitor C y3 is grounded.

5. An EMI filter as recited in claim 1, wherein, The coils of the first inductor, the second inductor and the third inductor are all wound on the same magnetic ring.

Images