New energy automobile filter and anti-LC resonance current circuit
By connecting a resistor in parallel at the junction of the Y capacitor, an anti-LC resonant current circuit is formed, which solves the problem of excessive current in the filter of new energy vehicles at the resonant frequency, and realizes the protection of the capacitor and the improvement of the durability of the filter.
Patent Information
- Application Number
- CN202520554577.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-03-27
AI Technical Summary
When new energy vehicle filters are used over a wide frequency range, the inductance and capacitance of the EMC filter generate LC resonance at the resonant frequency, resulting in excessive grounding current of the Y capacitor, which affects the capacitor's lifespan or even damages it.
A first resistor and a second resistor are connected in parallel between the points where the Y capacitors are connected to form an anti-LC resonant current circuit, thereby reducing the current during resonance.
This effectively reduces the current between the Y capacitor and the ground point during resonance, protecting the capacitor and improving the filter's durability.
Smart Images
Figure CN223957526U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the filter technical field of new energy automobile, especially a kind of new energy automobile filter and anti LC resonant current circuit. BACKGROUND
[0002] In new energy automobile industry, filter is needed to be used to suppress electromagnetic interference in circuit.
[0003] Common mode inductor and / or differential mode inductor, X capacitor and Y capacitor are installed in general filter, electromagnetic interference is significantly reduced by X capacitor and Y capacitor etc. component, X capacitor is used for filtering between positive and negative, Y capacitor is used for filtering between positive and negative and ground, common mode inductor suppresses common mode interference, differential mode inductor suppresses differential mode interference.
[0004] In filter interior, common mode inductor and / or differential mode inductor, capacitor can constitute simple LC circuit, inductor, capacitor and ground form series resonance circuit, impedance Z=R (ωL-1 / ωC) in LC circuit, wherein R is the loss resistance of coil, when frequency ƒ is equal to resonance frequency ƒ0, ωL=1 / ωC, impedance Z is minimum.
[0005] Now the frequency range width of some new energy automobile filter is larger, inductance and capacitor in EMC filter interior can produce LC resonance when frequency reaches resonance frequency, impedance changes to minimum when resonating, Y capacitor is large to ground current, more than rated current several times or dozens of times, affect the service life of capacitor and even damage capacitor. INVENTION CONTENTS
[0006] The utility model aims at providing a kind of new energy automobile filter and anti LC resonant current circuit, first resistance and second resistance are connected in parallel between Y capacitor and ground in anti LC resonant current circuit, and current when resonating is greatly reduced.
[0007] The above technical purpose of the utility model is realized by the following technical scheme: anti LC resonant current circuit, including positive bus copper bar, negative bus copper bar, first common mode inductor L1, second common mode inductor L2, several X capacitors and several Y capacitors;The positive and negative input terminals of the first common mode inductor L1 are respectively connected to the input terminals of the positive bus copper bar and the negative bus copper bar, and the positive and negative output terminals of the first common mode inductor L1 are respectively connected to the positive bus copper bar and the negative bus copper bar;The positive and negative input terminals of the second common mode inductor L2 are respectively connected to the positive bus copper bar and the negative bus copper bar, and the positive and negative output terminals of the second common mode inductor L2 are respectively connected to the output terminals of the positive bus copper bar and the negative bus copper bar;Several Y capacitors are respectively connected to the first common mode inductor L1 or the second common mode inductor L2, and first resistance and second resistance are connected in parallel between the Y capacitor and ground.
[0008] The utility model discloses further provide that: X capacitor includes X capacitor C1 and X capacitor C6, and X capacitor C1 is parallel to the input of positive bus copper bar and negative bus copper bar, and X capacitor C6 is parallel to the output of positive bus copper bar and negative bus copper bar.
[0009] The utility model discloses further provide that: Y capacitor includes Y capacitor C2, Y capacitor C3, Y capacitor C4, Y capacitor C5, and Y capacitor C2 connects the positive input of first common mode inductance L1, and Y capacitor C3 connects the negative input of first common mode inductance L1, and Y capacitor C4 connects the positive input of second common mode inductance L2, and Y capacitor C5 connects the negative input of second common mode inductance L2.
[0010] The utility model discloses further provide that: Y capacitor still includes Y capacitor C7 and Y capacitor C8, and Y capacitor C7 connects the output of positive bus copper bar, and Y capacitor C8 connects the output of negative bus copper bar.
[0011] The utility model discloses further provide that: first common mode inductance L1 includes first nanocrystalline magnetic core.
[0012] The utility model discloses further provide that: second common mode inductance L2 includes second ferrite magnetic core and second nanocrystalline magnetic core.
[0013] The utility model discloses further provide that: first resistance and second resistance resistance value are same.
[0014] The utility model discloses further provide that: including shell and anti LC resonance current circuit.
[0015] The utility model discloses further provide that: positive bus copper bar and negative bus copper bar are parallelly arranged in the shell, and the first PCB board, the second PCB board and the third PCB board are arranged on the shell and are spaced apart from the first common mode inductance and the second common mode inductance.
[0016] The utility model discloses further provide that: the input voltage range of filter is 200V ~ 600V, and the input direct current is not less than 50A.
[0017] Compared with the prior art, the utility model has the following beneficial effects: 1, the first resistance and the second resistance are connected in parallel between the Y capacitor docking points in the anti LC resonance current circuit, which greatly reduces the current between the Y capacitor docking points during resonance, and protects the capacitor; 2, the anti LC resonance current circuit is used in the new energy automobile filter, so that the filter is more durable. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the anti LC resonance current circuit schematic diagram in example 1.
[0019] Figure 2 is a structural diagram of the new energy vehicle filter in Example 2.
[0020] Figure 3 is a sectional view of the new energy vehicle filter in Example 2.
[0021] Figure 4 is an internal structure diagram of the new energy vehicle filter in Example 2.
[0022] In the figure: 1, shell; 2, positive busbar copper bar; 3, negative busbar copper bar; 4, one-level nanocrystalline magnetic core; 5, two-level ferrite magnetic core; 6, two-level nanocrystalline magnetic core; 7, first PCB board; 8, second PCB board; 9, third PCB board; 10, capacitor; 11, insulating column; 12, conductive copper sheet. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. It should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0024] Example 1
[0025] As shown in Figure 1 , in this example, an LC resonance current resisting circuit is disclosed, which comprises a positive busbar copper bar, a negative busbar copper bar, a first common mode inductor L1, a second common mode inductor L2, a plurality of X capacitors and a plurality of Y capacitors; the positive busbar copper bar is connected to a positive HV+, and the positive input is connected to the positive output; the negative busbar copper bar is connected to a negative HV-, and the negative input is connected to the negative output.
[0026] In this embodiment, the first common mode inductor L1 comprises a first nanocrystalline magnetic core, and the second common mode inductor L2 comprises a second ferrite magnetic core and a second nanocrystalline magnetic core.
[0027] As shown in Figure 1As shown, the positive and negative input terminals of the first-stage common-mode inductor L1 are connected to the input terminals of the positive and negative bus copper bus, respectively, and the positive and negative output terminals of the first-stage common-mode inductor L1 are connected to the positive and negative bus copper bus, respectively; the positive and negative input terminals of the second-stage common-mode inductor L2 are connected to the positive and negative bus copper bus, respectively, and the positive and negative output terminals of the second-stage common-mode inductor L2 are connected to the output terminals of the positive and negative bus copper bus, respectively.
[0028] like Figure 1 As shown, in this embodiment, the X capacitor includes X capacitor C1 and X capacitor C6. X capacitor C1 is connected in parallel with the input terminals of the positive bus copper bus and the negative bus copper bus, and X capacitor C6 is connected in parallel with the output terminals of the positive bus copper bus and the negative bus copper bus.
[0029] like Figure 1 As shown, in this embodiment, the Y capacitors include Y capacitors C2, C3, C4, C5, C7, and C8. One end of Y capacitor C2 is connected to the positive input terminal of the first-stage common-mode inductor L1, and the other end of Y capacitor C2 is connected in parallel with resistors R1 and R2, which are connected to ground. One end of Y capacitor C3 is connected to the negative input terminal of the first-stage common-mode inductor L1, and the other end of Y capacitor C3 is connected in parallel with resistors R3 and R4, which are connected to ground. One end of Y capacitor C4 is connected to the positive input terminal of the second-stage common-mode inductor L2, and the other end of Y capacitor C4 is connected in parallel with resistors R5 and R6, which are connected to ground. One end of Y capacitor C5 is connected to the negative input terminal of the second-stage common-mode inductor L2, and the other end of Y capacitor C5 is connected in parallel with resistors R7 and R8. Resistors R7 and R8 are connected to the grounding point; one end of Y capacitor C7 is connected to the output terminal of the positive bus copper bus, and the other end of Y capacitor C7 is connected in parallel with resistors R9 and R10, which are connected to the grounding point; one end of Y capacitor C8 is connected to the output terminal of the negative bus copper bus, and the other end of Y capacitor C8 is connected in parallel with resistors R11 and R12, which are connected to the grounding point.
[0030] Through testing, the optimal results were achieved when the following conditions were met: resistors R1 and R2 connected in parallel to Y capacitor C2 had the same resistance value; resistors R3 and R4 connected in parallel to Y capacitor C3 had the same resistance value; resistors R5 and R6 connected in parallel to Y capacitor C4 had the same resistance value; resistors R7 and R8 connected in parallel to Y capacitor C5 had the same resistance value; resistors R9 and R10 connected in parallel to Y capacitor C7 had the same resistance value; and resistors R11 and R12 connected in parallel to Y capacitor C8 had the same resistance value.
[0031] Example 2
[0032] like Figures 2-4As shown, the new energy vehicle filter in the example also discloses a new energy vehicle filter, which comprises a shell 1 and an anti-LC resonance current circuit arranged on the shell 1, so as to avoid the problem that when the frequency reaches the resonance frequency, LC resonance is generated to cause the Y capacitor 10 in the filter to have excessive grounding current.
[0033] As Figure 2 As shown, the shell 1 is provided with a first-stage nanocrystalline magnetic core, a second-stage ferrite magnetic core 5 and a second-stage nanocrystalline magnetic core 6, and the positive busbar copper bar 2 and the negative busbar copper bar 3 are arranged in the shell 1 and penetrate the first-stage nanocrystalline magnetic core 4, the second-stage ferrite magnetic core 5 and the second-stage nanocrystalline magnetic core 6 in parallel with each other, and the positive busbar copper bar 2 and the negative busbar copper bar 3 are separated in parallel by the insulating column 11.
[0034] The first-stage common-mode inductor comprises the first-stage nanocrystalline magnetic core and the winding thereon, and the second-stage common-mode inductor comprises the second-stage ferrite magnetic core 5, the second-stage nanocrystalline magnetic core 6 and the winding thereon.
[0035] As Figure 2 As shown, the first PCB board 7, the second PCB board 8 and the third PCB board 9 are arranged on the shell 1 and are spaced apart from the first-stage common-mode inductor and the second-stage common-mode inductor, and the PCB boards are respectively provided with the capacitor 10 and the resistor, and the first PCB board 7, the second PCB board 8 and the third PCB board 9 are respectively electrically connected with the positive busbar copper bar 2 and / or the negative busbar copper bar 3 through the conductive copper sheet 12.
[0036] The input voltage range of the filter in the embodiment is 200V-600V, and the input direct current is not less than 50A.
[0037] The above description is only the preferred embodiment of the present application, so equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.
Claims
1. Anti-LC resonant current circuit, characterized by: The anti-LC resonance current circuit comprises a positive bus copper bar, a negative bus copper bar, a first common-mode inductor L1, a second common-mode inductor L2, a plurality of X capacitors and a plurality of Y capacitors; the positive and negative input ends of the first common-mode inductor L1 are connected to the input ends of the positive bus copper bar and the negative bus copper bar respectively, and the positive and negative output ends of the first common-mode inductor L1 are connected to the positive bus copper bar and the negative bus copper bar respectively; the positive and negative input ends of the second common-mode inductor L2 are connected to the positive bus copper bar and the negative bus copper bar respectively, and the positive and negative output ends of the second common-mode inductor L2 are connected to the output ends of the positive bus copper bar and the negative bus copper bar respectively; the plurality of Y capacitors are connected to the first common-mode inductor L1 or the second common-mode inductor L2 respectively, and the Y capacitors are connected in parallel with the grounding point through a first resistor and a second resistor.
2. The anti-LC resonant current circuit of claim 1, wherein: The X capacitors comprise an X capacitor C1 and an X capacitor C6, the X capacitor C1 is connected in parallel with the input ends of the positive bus copper bar and the negative bus copper bar, and the X capacitor C6 is connected in parallel with the output ends of the positive bus copper bar and the negative bus copper bar.
3. The anti-LC resonant current circuit of claim 1, wherein: The Y capacitors comprise a Y capacitor C2, a Y capacitor C3, a Y capacitor C4 and a Y capacitor C5; the Y capacitor C2 is connected to the positive input end of the first common-mode inductor L1, the Y capacitor C3 is connected to the negative input end of the first common-mode inductor L1, the Y capacitor C4 is connected to the positive input end of the second common-mode inductor L2, and the Y capacitor C5 is connected to the negative input end of the second common-mode inductor L2.
4. The anti-LC resonant current circuit of claim 3, wherein: The Y capacitors further comprise a Y capacitor C7 and a Y capacitor C8; the Y capacitor C7 is connected to the output end of the positive bus copper bar, and the Y capacitor C8 is connected to the output end of the negative bus copper bar.
5. The anti-LC resonant current circuit of claim 1, wherein: The first common-mode inductor L1 comprises a first nanocrystalline magnetic core.
6. The anti-LC resonant current circuit of claim 1, wherein: The second common-mode inductor L2 comprises a second ferrite magnetic core and a second nanocrystalline magnetic core.
7. The anti-LC resonant current circuit of claim 1, wherein: The first resistor and the second resistor have the same resistance value.
8. A new energy vehicle filter, characterized in that: The anti-LC resonance current circuit comprises a housing and the anti-LC resonance current circuit according to any one of claims 1-7.
9. The filter for a new energy vehicle according to claim 8, characterized in that: The positive bus copper bar and the negative bus copper bar are arranged in parallel in the housing, and the first PCB board, the second PCB board and the third PCB board are arranged on the housing at intervals of the first common-mode inductor and the second common-mode inductor.
10. The filter for a new energy vehicle according to claim 9, characterized in that: The input voltage range of the filter is 200V-600V, and the input direct current is not less than 50A.