CN220554262U - EMC filter shielding device and new energy automobile - Google Patents

Abstract

The utility model provides an EMC filter shielding device and a new energy automobile, and relates to the technical field of filtering of a new energy automobile charger. The EMC filter shielding device comprises a circuit board, a shielding shell and a filter circuit; a filter circuit is arranged on the circuit board; the filter circuit comprises a plurality of grounding terminals; the circuit board is provided with a plurality of grounding convex parts, and each grounding convex part is correspondingly connected with each grounding end one by one; the shielding shell is provided with a plurality of grooves, and each groove corresponds to each grounding protruding part one by one and is in interference connection. The utility model reduces the production cost of the filter shielding device, ensures the stable grounding and effectively inhibits and bypasses the emission capability of EMI.

Description

EMC filter shielding device and new energy automobile

Technical Field

The utility model relates to the technical field of filtering of new energy automobile chargers, in particular to an EMC filter shielding device and a new energy automobile.

Background

The conduction emission and radiation emission generated by the spark signals of the motor commutation can affect other parts on the whole vehicle, the existing EMC (Electro Magnetic Compatibility ) filtering shielding structure needs to be grounded by a plurality of grounding spring plates, but the grounding spring plates are fragile and easy to break due to insufficient elastic force, the production and processing are difficult, the spring plates are high in cost, the good grounding of the filter is difficult to ensure, and the broken spring plates are easy to cause short circuit.

Disclosure of Invention

In view of this, the utility model provides an EMC filter shielding device and a new energy automobile, which eliminate the original unstable grounding spring piece, reduce the production cost of the EMC filter shielding device, ensure the stable grounding, effectively inhibit and bypass electromagnetic interference and reduce the interference to other circuits. The utility model provides the following technical scheme:

in a first aspect, the present application proposes an EMC filter mask comprising a circuit board, a mask shell and a filter circuit; a filter circuit is arranged on the circuit board; the filter circuit comprises a plurality of grounding terminals; the circuit board is provided with a plurality of grounding protruding parts, and each grounding protruding part is connected with each grounding end in a one-to-one correspondence manner; the shielding shell is provided with a plurality of grooves, and each groove is in one-to-one correspondence with each grounding protruding part and is in interference connection.

In one embodiment, the recess has a gradual opening size, and the recess has a gradually decreasing top-to-bottom size.

In one embodiment, the shield housing is connected to the motor housing.

In one embodiment, the filtering circuit includes a two-wire balanced filter, a differential mode filtering unit, and a common mode filtering unit;

the first end of the double-wire balance filter is connected with the positive electrode of the power supply, and the second end of the double-wire balance filter is connected with the negative electrode of the power supply; the double-line balance filter, the differential mode filter unit and the common mode filter unit are arranged in parallel between the positive electrode of the power supply and the negative electrode of the power supply; the common mode filter unit is grounded, and the double-line balance filter is grounded.

In one embodiment, the filter circuit further comprises a zener diode; the bidirectional zener diode is connected in parallel with the two-wire balanced filter.

In an embodiment, the differential mode filtering unit includes a first capacitor, and the common mode filtering unit includes a first capacitor group and a second capacitor group;

the first end of the first capacitor bank is electrically connected with the first capacitor, the second end of the first capacitor bank is electrically connected with the first end of the second capacitor bank, the second end of the second capacitor bank is electrically connected with the first capacitor, and both the first capacitor bank and the second capacitor bank are grounded.

In an embodiment, the first capacitor group includes a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are connected in parallel.

In an embodiment, the second capacitor group includes an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor; the eighth capacitance, the ninth capacitance, the tenth capacitance, the eleventh capacitance, the twelfth capacitance, and the thirteenth capacitance are connected in parallel.

In an embodiment, the second capacitance and the eighth capacitance are equal in capacity, the third capacitance and the ninth capacitance are equal in capacity, and the fourth capacitance, the fifth capacitance, the sixth capacitance, the seventh capacitance, the tenth capacitance, the eleventh capacitance, the twelfth capacitance, and the thirteenth capacitance are equal in capacity.

In a second aspect, the present application provides a new energy automobile, including the EMC filter mask of embodiment 1 of the present application.

According to the utility model, the grounding protruding part on the circuit board is in interference fit with the groove of the shielding shell, so that the grounding end of the filter circuit is connected with the grounding protruding part, the stable grounding of the circuit is ensured, the process is optimized, and the production cost is reduced.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a block diagram of an EMC filter mask provided by an embodiment of the utility model;

fig. 2 shows a filter circuit diagram provided by an embodiment of the present utility model.

Description of main reference numerals:

a 100-EMC filter mask; 101-a circuit board; 1011-ground projecting members; 102-shielding the chassis; 1021-grooves; 103-a filter circuit; 1031-a common mode filtering unit; 1032—a differential mode filtering unit; 1033-a two-wire balanced filter; 1034-a bidirectional zener diode; c1-a first capacitance; c2-a second capacitance; a C3-third capacitor; c4-fourth capacitance; c5-fifth capacitance; c6-sixth capacitance; c7-seventh capacitance; c8-eighth capacitance; c9_ninth capacitance; c10-tenth capacitance; c11-eleventh capacitance; c12-twelfth capacitance; c13-thirteenth capacitance.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Example 1

An embodiment of the present application provides an EMC filter mask, and in particular, please refer to fig. 1 and 2.

The EMC filter screen 100 includes a circuit board 101, a screen housing 102, and a filter circuit 103; the circuit board 101 is provided with a filter circuit 103; the filter circuit 103 includes a plurality of ground terminals; the circuit board 101 is provided with a plurality of grounding protruding parts 1011, and each grounding protruding part 1011 is connected with each grounding end in a one-to-one correspondence manner; the shielding shell 102 has a plurality of grooves 1021, and each groove 1021 is in one-to-one correspondence with each grounding protruding member 1011, and is in interference connection.

When the motor is running, the generated spark signal will carry energy and generate electromagnetic interference, in this embodiment, the filter circuit 103 is matched with the shielding structure, and the EMC filter shielding device 100 is connected with the motor housing, that is, grounded, so that the spark signal generated by the motor passes through the filter circuit 103, goes to the grounding protruding part 1011 of the circuit board 101, goes to the shielding shell 102, and goes to the motor shell, so as to form a path with low impedance, and the generated electromagnetic interference is conducted to the ground, thereby reducing the external radiation. Wherein the shielding structure includes a shielding housing 102 and a circuit board 101.

It should be noted that, interference means that the fit clearance between the parts is smaller than that of the ideal case, so that a certain force needs to be applied to make the parts smoothly assembled in the actual assembly process. For example, if the bottom dimension of the groove 1021 in the present embodiment is 25 mm, the dimension of the grounding protruding member 1011 is 25 mm plus 5 wires, and at this time, the dimension of the grounding protruding member 1011 is slightly larger than the dimension of the bottom of the groove 1021, so that the components can be tightly connected after assembly, thereby ensuring stable positions of the components and effective transmission of signals.

In one embodiment, the grooves 1021 have a gradual opening size, and the top-to-bottom size of the grooves 1021 gradually decreases.

In this embodiment, the top of the groove 1021, i.e. the outward end of the groove 1021, the bottom of the groove 1021, i.e. the inward end of the groove 1021, and the top-to-bottom dimension of the groove 1021 gradually decrease, for example, if the groove 1021 in this embodiment adopts a gradual opening dimension, the top dimension of the groove 1021 is 25 mm plus 15 wires, the bottom dimension of the groove 1021 is 25 mm, and the dimension of the grounding lug 1011 cooperatively connected with the groove 1021 is 25 mm plus 5 wires, then during the assembly process, the top of the groove 1021 and the grounding lug 1011 can be smoothly assembled without applying an external force, and as the assembly goes deep, the groove 1021 and the grounding lug 1011 are in interference fit when the grounding lug 1011 is assembled to the bottom of the groove 1021, so that the connection of the groove 1021 and the grounding lug is more tightly.

The installation mode in the embodiment does not need welding in the installation process, and optimizes the production process.

In one embodiment, the shield housing 102 is coupled to a motor housing.

The connection of the shield case 102 to the motor case corresponds to grounding the EMC filter screen 100, and the filter circuit 103 on the circuit board 101 is grounded through the shield case 102 by the grounding terminal to the grounding projecting member 1011 on the circuit board 101 for introducing the spark signal.

In an embodiment, the filtering circuit 103 includes a two-wire balanced filter 1033, a differential mode filtering unit 1032, and a common mode filtering unit 1031; the first end of the two-wire balance filter 1033 is connected with the positive electrode of the power supply, and the second end of the two-wire balance filter 1033 is connected with the negative electrode of the power supply; the two-wire balance filter 1033, the differential mode filter unit 1032, and the common mode filter unit 1031 are connected in parallel between the positive electrode of the power supply and the negative electrode of the power supply; the common mode filter unit 1031 is grounded, and the two-wire balanced filter 1033 is grounded.

In the present embodiment, the third terminal and the fourth terminal of the two-wire balanced filter 1033 are respectively connected to the grounding protruding member 1011 on the circuit board 101, i.e., grounded. The first and second terminals of the two-wire balanced filter 1033 are non-conductive, the third and fourth terminals are conductive and the resistance is 0 ohms.

The bidirectional balanced filter is a filter for suppressing the common mode interference on the power supply line, and suppresses the influence of the common mode signal by dividing the signal transmission line into two wires and performing a filter process on the signal on each wire.

In one embodiment, the filter circuit 103 further includes a zener diode 1034; the diac 1034 is connected in parallel with the two-wire balance filter 1033.

In this embodiment, the bidirectional zener diode 1034 is connected in parallel with the two-wire balance filter 1033 between the positive electrode of the power supply and the negative electrode of the power supply, wherein both the positive and negative directions of the bidirectional zener diode 1034 have voltage stabilizing effect, and two PN junctions connected in anti-parallel are arranged inside the bidirectional zener diode 1034 and have different breakdown voltages. When the voltage in the circuit exceeds the set breakdown voltage, one PN junction enters a reverse breakdown state, and forms a low-impedance path to guide the overvoltage to the ground or other low-voltage points. Meanwhile, the other PN junction still keeps a normal working state and is not conducted.

The bi-directional zener diode 1034 is connected in parallel with the two-wire balance filter 1033, which can perform an overvoltage protection function on the two-wire balance filter 1033, for example, if the voltage is overloaded at a certain moment in the circuit operation, the bi-directional zener diode 1034 breaks down first to form a short circuit, so as to protect the two-wire balance filter 1033.

In an embodiment, the differential mode filtering unit 1032 includes a first capacitor C1, and the common mode filtering unit 1031 includes a first capacitor group and a second capacitor group;

the first end of the first capacitor bank is electrically connected with the first capacitor C1, the second end of the first capacitor bank is electrically connected with the first end of the second capacitor bank, the second end of the second capacitor bank is electrically connected with the first capacitor C1, and both the first capacitor bank and the second capacitor bank are grounded.

The differential mode filter unit 1032 is configured to suppress a differential mode signal, and in this embodiment, the differential mode filter unit 1032 performs a filtering process on the differential mode signal, so that the differential mode signal is attenuated or eliminated in the output signal, thereby suppressing an influence of the differential mode signal.

In this embodiment, the common mode filtering unit 1031 is configured to suppress a common mode signal; the grounding ends of the first capacitor bank and the second capacitor bank are connected to the grounding projection 1011, i.e., grounded.

In an embodiment, the first capacitor group includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, and a seventh capacitor C7; the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are connected in parallel.

It should be noted that, the cut-off frequencies of the capacitive filters of different capacities are different, for example: the cutoff frequency of the 1uF capacitor is 5MHz, the cutoff frequency of the 0.1uF capacitor is 16MHz, the cutoff frequency of the 0.01uF capacitor is 50MHz, the cutoff frequency of the 1000pF capacitor is 160MHz, the cutoff frequency of the 100pF capacitor is 500MHz, and the cutoff frequency of the 10pF capacitor is 1.6GHz.

In this embodiment, the second capacitor C2 has a capacity of 470nF, the third capacitor C3 has a capacity of 1nF, and the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 have a capacity of 3.3pF.

In an embodiment, the second capacitor group includes an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a thirteenth capacitor C13; the eighth capacitance C8, the ninth capacitance C9, the tenth capacitance C10, the eleventh capacitance C11, the twelfth capacitance C12, and the thirteenth capacitance C13 are connected in parallel.

In the present embodiment, the eighth capacitor C8 has a capacity of 470nF, the ninth capacitor C9 has a capacity of 1nF, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 each have a capacity of 3.3pF.

The equivalent series ESR value (Equivalent Series Resistance ) of the capacitor itself can be reduced by using a plurality of sets of high-frequency capacitors. The capacitor has equivalent series resistance ESR under the high frequency condition, so that the actual performance and the theoretical performance of the capacitor are different, and a plurality of groups of high-frequency capacitors are connected in parallel, so that the equivalent series resistance ESR of the whole capacitor can be reduced, and the performance and the response speed of the capacitor are improved. The grounding protruding parts 1011 on the circuit board 101 are matched with a plurality of groups of high-frequency capacitors, so that high-frequency components of spark signals can be sufficiently led into the motor shell, the loop impedance is reduced, and the high-frequency electromagnetic interference is reduced.

For example, the spark signal of the motor is led to the grounding protruding part 1011, the shielding shell 102 and the motor shell, namely the grounding, along the positive electrode and the negative electrode of the motor power supply through the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7 or the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 in the first capacitor group.

In an embodiment, the second capacitor C2 and the eighth capacitor C8 have equal capacities, the third capacitor C3 and the ninth capacitor C9 have equal capacities, and the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 have equal capacities.

The EMC filter shielding device provided by the embodiment of the application comprises a circuit board, a shielding shell and a filter circuit; a filter circuit is arranged on the circuit board; the filter circuit comprises a plurality of grounding terminals; the circuit board is provided with a plurality of grounding convex parts, and each grounding convex part is correspondingly connected with each grounding end one by one; the shielding shell is provided with a plurality of grooves, and each groove corresponds to each grounding protruding part one by one and is in interference connection. According to the shielding structure, the shielding structure comprising the circuit board and the shielding shell is improved, the filter circuit is matched, the original unstable grounding elastic sheet is removed, the grounding is ensured to be stable through the interference fit between the grounding protruding part on the circuit board and the groove on the shielding shell, and the filter circuit on the circuit board is matched, so that electromagnetic interference is effectively restrained and bypassed.

Example 2

In addition, the embodiment of the application also provides a new energy automobile, which comprises the EMC filter shielding device in the embodiment 1 of the application.

Specifically, the EMC filter 100 is used for filtering electromagnetic interference generated during the operation of the new energy automobile motor.

The new energy automobile comprises the EMC filter shielding device provided in the embodiment 1 of the application, wherein the EMC filter shielding device comprises a circuit board, a shielding shell and a filter circuit; a filter circuit is arranged on the circuit board; the filter circuit comprises a plurality of grounding terminals; the circuit board is provided with a plurality of grounding convex parts, and each grounding convex part is correspondingly connected with each grounding end one by one; the shielding shell is provided with a plurality of grooves, and each groove corresponds to each grounding protruding part one by one and is in interference connection. According to the shielding structure, the shielding structure comprising the circuit board and the shielding shell is improved, the filter circuit is matched, the original unstable grounding elastic sheet is removed, the grounding is ensured to be stable through the interference fit between the grounding protruding part on the circuit board and the groove on the shielding shell, and the filter circuit on the circuit board is matched, so that electromagnetic interference is effectively restrained and bypassed.

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (10)

1. An EMC filter shielding device is characterized by comprising a circuit board, a shielding shell and a filter circuit;

a filter circuit is arranged on the circuit board;

the filter circuit comprises a plurality of grounding terminals;

the circuit board is provided with a plurality of grounding protruding parts, and each grounding protruding part is connected with each grounding end in a one-to-one correspondence manner;

the shielding shell is provided with a plurality of grooves, and each groove is in one-to-one correspondence with each grounding protruding part and is in interference connection.

2. The EMC filter screen of claim 1, wherein the recess has a gradual opening size, and wherein the recess tapers in top-to-bottom size.

3. The EMC filter shield of claim 2, wherein the shield housing is coupled to the motor housing.

4. The EMC filter mask of claim 1, wherein the filter circuit includes a two-wire balanced filter, a differential mode filter unit, and a common mode filter unit;

the first end of the double-wire balance filter is connected with the positive electrode of the power supply, and the second end of the double-wire balance filter is connected with the negative electrode of the power supply;

the double-line balance filter, the differential mode filter unit and the common mode filter unit are arranged in parallel between the positive electrode of the power supply and the negative electrode of the power supply;

the common mode filter unit is grounded, and the double-line balance filter is grounded.

5. The EMC filter mask of claim 4, wherein the filter circuit further comprises a zener diode;

the bidirectional zener diode is connected in parallel with the two-wire balanced filter.

6. The EMC filter mask of claim 4, wherein the differential mode filter unit includes a first capacitance;

the common mode filtering unit comprises a first capacitor group and a second capacitor group;

the first end of the first capacitor bank is electrically connected with the first capacitor, the second end of the first capacitor bank is electrically connected with the first end of the second capacitor bank, the second end of the second capacitor bank is electrically connected with the first capacitor, and both the first capacitor bank and the second capacitor bank are grounded.

7. The EMC filter shield of claim 6, wherein the first capacitance set includes a second capacitance, a third capacitance, a fourth capacitance, a fifth capacitance, a sixth capacitance, and a seventh capacitance;

the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are connected in parallel.

8. The EMC filter shield of claim 7, wherein the second capacitance set includes an eighth capacitance, a ninth capacitance, a tenth capacitance, an eleventh capacitance, a twelfth capacitance, and a thirteenth capacitance;

the eighth capacitance, the ninth capacitance, the tenth capacitance, the eleventh capacitance, the twelfth capacitance, and the thirteenth capacitance are connected in parallel.

9. The EMC filter shield of claim 8, wherein the second capacitance and the eighth capacitance are equal in capacity, the third capacitance and the ninth capacitance are equal in capacity, and the fourth capacitance, the fifth capacitance, the sixth capacitance, the seventh capacitance, the tenth capacitance, the eleventh capacitance, the twelfth capacitance, and the thirteenth capacitance are equal in capacity.

10. A new energy vehicle, characterized by comprising an EMC filter screen as claimed in any one of claims 1-9.