Filter circuit and filter assembly

Abstract

The utility model provides a filter circuit and a filter assembly, the filter circuit is used for the filter assembly of an electric drive controller of a vehicle, the filter circuit comprises a first bus, a second bus, a plurality of groups of capacitance circuits and at least one inductance circuit, the first bus is used for accessing a first level signal; the second bus is used for accessing a second level signal; the plurality of groups of capacitor circuits are arranged at intervals along the flowing direction of the first level signal or the second level signal, and the capacitor circuits are connected between the first bus and the second bus; the capacitance circuit is used for performing high-frequency filtering processing on the first level signal and the second level signal; the inductive circuit is arranged between two groups of adjacent capacitive circuits along the flowing direction and is connected with the first bus and the second bus; the inductance circuit is used for carrying out high-frequency filtering processing on the first level signal and the second level signal. Through the mode, the filtering effect of the filtering assembly can be effectively improved, so that the working stability of the electric drive controller is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter assemblies of electric drive controllers, and in particular to a filter circuit and a filter assembly. BACKGROUND

[0002] With the rapid development of the automotive industry, the market share of electric vehicles is increasing. The electric drive controller of an electric vehicle, as one of the core components of an electric vehicle, is crucial to its performance and reliability. Filter assemblies play an important role in filtering noise, stabilizing voltage and current in electric drive controllers. However, with the popularization of new energy vehicle 800V high voltage platforms, the performance requirements for filter assemblies are becoming higher and higher, and the existing filter assemblies of high voltage electric drive controllers have poor filtering effect, which affects the stability of the electric drive controller. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a filter circuit for a filter assembly of an electric drive controller of a vehicle, comprising: a first bus bar, a second bus bar, a plurality of capacitor circuits, and at least one inductor circuit; the first bus bar is used for connecting a first level signal; the second bus bar is used for connecting a second level signal; the plurality of capacitor circuits are arranged in the flow direction of the first level signal or the second level signal, and the capacitor circuits are connected between the first bus bar and the second bus bar; the capacitor circuits are used for high-frequency filtering processing of the first level signal and the second level signal; the inductor circuit is arranged between two adjacent capacitor circuits in the flow direction and connected with the first bus bar and the second bus bar; the inductor circuit is used for high-frequency filtering processing of the first level signal and the second level signal.

[0004] In some embodiments, the capacitor circuit comprises: a first Y-type capacitor, a first signal end of which is connected with the first bus bar, and a second signal end of which is grounded; and a second Y-type capacitor, a first signal end of which is connected with the second bus bar, and a second signal end of which is grounded.

[0005] In some embodiments, the capacitor circuit further comprises: at least one X-type capacitor, a first signal end of which is connected with the first bus bar, and a second signal end of which is connected with the second bus bar.

[0006] In some embodiments, in the flow direction, the number of X-type capacitors in the capacitor circuit decreases in turn.

[0007] In some embodiments, the filter circuit comprises three groups of capacitor circuits and two inductor circuits; the three groups of capacitor circuits comprise a first-stage capacitor circuit, a second-stage capacitor circuit and a third-stage capacitor circuit which are arranged in the flow direction in turn; the two inductor circuits comprise a first-stage inductor circuit and a second-stage inductor circuit, the first-stage inductor circuit is arranged between the first-stage capacitor circuit and the second-stage capacitor circuit, and the second-stage inductor circuit is arranged between the second-stage capacitor circuit and the third-stage capacitor circuit.

[0008] In some embodiments, the inductance value of the first-stage inductive circuit is greater than the inductance value of the second-stage inductive circuit.

[0009] The application provides a filtering assembly, which comprises: two copper bars, one of which is used as a first busbar for accessing a first-level signal, and the other of which is used as a second busbar for accessing a second-level signal, the two copper bars being arranged side by side at intervals, the copper bar comprising a straight section extending in a first direction and two overlapping sections connected to the two ends of the straight section, the straight sections of the two copper bars being arranged in overlap in a second direction perpendicular to the main surface of the straight section; at least one magnetic ring arranged around the straight sections of the two copper bars, the magnetic ring being used as an inductive circuit to perform high-frequency filtering processing on the first-level signal and the second-level signal; a plurality of sets of capacitor filtering assemblies, each of which is electrically connected to the two copper bars, the capacitor filtering assembly being used to form a capacitor circuit to perform high-frequency filtering processing on the first-level signal and the second-level signal; wherein the magnetic ring is located between two adjacent sets of capacitor filtering assemblies in the first direction, so that the inductive circuit is located between two adjacent capacitor circuits in the flow direction of the first-level signal or the second-level signal.

[0010] In some embodiments, the filtering assembly comprises three sets of capacitor filtering assemblies and two magnetic rings, the three sets of capacitor filtering assemblies comprising a first-stage capacitor filtering assembly, a second-stage capacitor filtering assembly and a third-stage capacitor filtering assembly arranged in sequence at intervals in the first direction, the two magnetic rings being arranged around the straight sections of the two copper bars, the two magnetic rings comprising a first magnetic ring and a second magnetic ring arranged at intervals in the first direction, the first magnetic ring being located between the first-stage capacitor filtering assembly and the second-stage capacitor filtering assembly in the first direction, and the second magnetic ring being located between the second-stage capacitor filtering assembly and the third-stage capacitor filtering assembly in the first direction.

[0011] In some embodiments, the second-stage capacitor filtering assembly comprises: a circuit board electrically connected to the two copper bars respectively; a plurality of safety capacitors electrically connected to the circuit board to form a second-stage capacitor circuit, a part of the plurality of safety capacitors being arranged on one side of the straight section in the second direction, and the other part being arranged on the other side of the straight section in the second direction.

[0012] In some embodiments, the filtering assembly further comprises: a housing provided with a plurality of mounting portions, the copper bars, the capacitor filtering assemblies and the magnetic rings being arranged in the corresponding mounting portions, the housing being used to provide structural support and electrical isolation for the copper bars, the capacitor filtering assemblies and the magnetic rings.

[0013] The beneficial effects of the embodiments of the present application are: the filter circuit includes a capacitor circuit and an inductor circuit, wherein the capacitor circuit and the inductor circuit can individually filter the first level signal and the second level signal at high frequency, and the capacitor circuit and the inductor circuit can also cooperate with each other to form a resonant circuit, thereby further improving the filtering effect of the filter circuit on the first level signal and the second level signal, and providing a more stable working voltage for the electric drive controller to effectively improve the working stability of the electric drive controller. After the high-frequency signal flows through the inductor circuit, most of the energy of the high-frequency signal will be consumed by the inductor circuit, and a small part will be repeatedly bounced back by the inductor circuit along the flow direction and the opposite direction of the flow direction. Therefore, the inductor circuit is arranged between the adjacent two groups of capacitor circuits along the flow direction, so that the capacitor circuit can filter the high-frequency signal bounced back by the inductor circuit, thereby improving the filtering effect of the filter circuit on the first level signal and the second level signal, and providing a more stable working voltage for the electric drive controller to effectively improve the working stability of the electric drive controller. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a circuit structure schematic diagram of a filter circuit according to an embodiment of the present application;

[0015] Figure 2 FIG. 5 is a three-dimensional structure schematic diagram of a filter assembly according to an embodiment of the present application;

[0016] Figure 3 FIG. 6 is an exploded structure schematic diagram of the filter assembly shown in FIG. 5; Figure 2

[0017] Figure 4 FIG. 8 is a three-dimensional structure schematic diagram of two copper bars arranged side by side. Figure 3 DETAILED DESCRIPTION

[0018] 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, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0019] ​​The terms "first", "second", etc. in this application are only for descriptive purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified. In addition, the terms "include" and "have" and any variations thereof are intended to cover exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to these processes, methods, products or devices.

[0020] As shown in Figure 1 The application provides a filter circuit 10 for a filter assembly 20 of an electric drive controller of a vehicle, such as a filter assembly 20 of an electric drive controller of a new energy electric vehicle, etc. The filter assembly 20 is arranged between a power element of a power supply circuit of the vehicle and the electric drive controller, for filtering an operating voltage output by the power element, such as an IGBT (Insulated Gate Bipolar Transistor) power element, etc. After passing through the IGBT, the high-frequency electromagnetic interference signals (i.e. high-frequency signals) generated by the IGBT during operation will be mixed in the operating voltage, affecting the operation of the electric drive controller.

[0021] The filter circuit 10 is used to filter the operating voltage (also referred to as a first level signal and a second level signal herein) of the electric drive controller to filter out the noise in the operating voltage, such as high-frequency signals generated by the IGBT during operation, high-frequency signals generated by changes in bus (such as a first bus 100 and a second bus 200) current, etc. to provide stable operating voltage and operating current for the electric drive controller.

[0022] The filter circuit 10 includes a first bus 100, a second bus 200, a plurality of capacitor circuits 300, and at least one inductor circuit 400. The first bus 100 is used to access the first level signal; the second bus 200 is used to access the second level signal; the plurality of capacitor circuits 300 are arranged along a flow direction x1 of the first level signal or the second level signal, and the capacitor circuits 300 are connected between the first bus 100 and the second bus 200; the capacitor circuits 300 are used to perform high-frequency filtering processing on the first level signal and the second level signal; the inductor circuit 400 is arranged between two adjacent capacitor circuits 300 along the flow direction x1 and connected with the first bus 100 and the second bus 200; the inductor circuit 400 is used to perform high-frequency filtering processing on the first level signal and the second level signal.

[0023] Specifically, in the embodiment of the present application, the first level signal and the second level signal are potential signals with equal amplitude and opposite phase. In other embodiments, the first level signal and the second level signal can also be level signals of other relationship types. The flow direction x1 of the first level signal or the second level signal is the direction in which the first level signal or the second level signal flows from the input end of the filter circuit 10 (the input end of the filter circuit 10 includes the input end V+ and the input end V-) to the output end of the filter circuit 10 (the output end of the filter circuit 10 includes the output end HV+ and the output end HV-). Wherein, the inductive circuit 400 is arranged between two groups of adjacent capacitive circuits 300 along the flow direction x1, which can be understood as that the first level signal and the second level signal can flow through the capacitive circuit 300, the inductive circuit 400 and another capacitive circuit 300 in sequence along the flow direction x1 after entering the filter circuit 10.

[0024] The capacitive circuit 300 and the inductive circuit 400 both have high-frequency filtering function, that is, the function of filtering high-frequency interference signals in the first level signal or the second level signal. The first level signal and the second level signal are direct current working voltages used by the electric drive controller of the vehicle. When the first level signal and the second level signal are output from the power supply of the vehicle, they may be mixed with noise (that is, high-frequency interference signals or high-frequency signals). The filter circuit 10 performs high-frequency filtering processing on the first level signal and the second level signal through the capacitive circuit 300 and the inductive circuit 400, so as to effectively filter out the noise in the first level signal and the second level signal, thereby providing stable working voltage for the electric drive controller, and effectively improving the working stability of the electric drive controller. Wherein, the high-frequency signal refers to a signal with high frequency, and its frequency range is generally between several hundred kilohertz (kHz) and several hundred megahertz (MHz). The low-frequency signal is a signal with low frequency, and its frequency range is generally between several hertz (Hz) and several kilohertz (kHz).

[0025] In the embodiment of the present application, the filter circuit 10 includes the capacitive circuit 300 and the inductive circuit 400. Wherein, the capacitive circuit 300 and the inductive circuit 400 can individually perform high-frequency filtering on the first level signal and the second level signal, and at the same time, the capacitive circuit 300 and the inductive circuit 400 can also cooperate with each other to form a resonant circuit, thereby further improving the filtering effect of the filter circuit 10 on the first level signal and the second level signal, and further providing more stable working voltage for the electric drive controller, so as to effectively improve the working stability of the electric drive controller.

[0026] After the high-frequency signal flows through the inductance circuit 400, most of the energy of the high-frequency signal is consumed by the inductance circuit 400, and a small part is repeatedly bounced back by the inductance circuit 400 along the flow direction x1 and the opposite direction of the flow direction x1. Therefore, the inductance circuit 400 is arranged between the two adjacent groups of capacitance circuits 300 along the flow direction x1, so that the capacitance circuit 300 can filter the high-frequency signal bounced back by the inductance circuit 400, thereby improving the filtering effect of the filter circuit 10 on the first level signal and the second level signal, and further providing a more stable working voltage for the electric drive controller, so as to effectively improve the working stability of the electric drive controller.

[0027] Optionally, as shown in Figure 1 , the capacitance circuit 300 includes a first Y-type capacitor (for example, Y-type capacitors C1, C8 and C10 shown in Figure 1 ) and a second Y-type capacitor (for example, Y-type capacitors C2, C9 and C11 shown in Figure 1 ), the first signal end of the first Y-type capacitor is connected with the first bus 100, and the second signal end of the first Y-type capacitor is grounded; the first signal end of the second Y-type capacitor is connected with the second bus 200, and the second signal end of the second Y-type capacitor is grounded.

[0028] Specifically, the capacitance circuit 300 is a circuit composed of a plurality of safety capacitors, for example, the capacitance circuit 300 can be composed of a plurality of Y-type capacitors (Safety Fixed capacitor) and a plurality of Y-type capacitors cooperating with X-type capacitors (Interferon Suppression Capacitance X2(X1 / X3)Class). In this embodiment, the capacitance circuit 300 includes at least two Y-type capacitors, i.e., a first Y-type capacitor and a second Y-type capacitor. The specific circuit connection structure of the first Y-type capacitor and the second Y-type capacitor can be referred to the above content and Figure 1 . The first Y-type capacitor and the second Y-type capacitor are both grounded, so that after the first level signal and the second level signal flow through the capacitance circuit 300, the high-frequency signal mixed in the first level signal and the second level signal can be conducted from the ground through the first Y-type capacitor and / or the second Y-type capacitor, thereby realizing the high-frequency filtering effect of the capacitance circuit 300 on the first level signal and the second level signal.

[0029] The inductor circuit 400 can be a magnetic ring 22, such as a ferrite magnetic ring, a nanocrystalline magnetic ring, etc., arranged around the bus bar. The Y-type capacitors have the effect of suppressing common-mode interference signals (including high-frequency signals generated during IGBT operation and high-frequency signals generated when the bus bar current changes). The capacitor circuit 300 composed of two Y-type capacitors is arranged on both sides of the inductor circuit 400 along the flow direction x1. In this way, the first level signal and the second level signal can be pre-suppressed by the capacitor circuit 300 before flowing through the inductor circuit 400, thereby reducing the working loss of the inductor circuit 400, balancing the temperature rise of each circuit element in the filter circuit 10, and effectively improving the working performance and reliability of the filter assembly 20.

[0030] Optionally, as shown in Figure 1 The capacitor circuit 300 further comprises at least one X-type capacitor (for example, the X-type capacitors C3, C4, C5, C6, C7, and C12 shown in Figure 1 The first signal end of the X-type capacitor is connected to the first bus bar 100, and the second signal end of the X-type capacitor is connected to the second bus bar 200.

[0031] Specifically, the first level signal and the second level signal are working power (also known as working voltage) of the electric drive controller of the vehicle. The first level signal and the second level signal are differential mode signals with equal amplitude and opposite phase. In order to ensure the working stability of the electric drive controller, it is necessary to eliminate the differential mode interference between the first level signal and the second level signal. Therefore, at least one X-type capacitor is connected between the first bus bar 100 and the second bus bar 200. The X-type capacitor can effectively reduce the differential mode interference between the first level signal and the second level signal, thereby providing more stable working voltage for the electric drive controller, and effectively improving the working stability of the electric drive controller.

[0032] Optionally, as shown in Figure 1 The number of X-type capacitors in the capacitor circuit 300 decreases in sequence along the flow direction x1. Specifically, the working voltage has the largest differential mode interference before being connected to the filter circuit 10. Therefore, arranging more X-type capacitors near the input end of the filter circuit 10 can effectively reduce the probability that the working voltage still has differential mode interference after being output by the filter circuit 10, thereby effectively improving the stability of the working voltage and the working stability of the electric drive controller.

[0033] Optionally, as shown in Figure 1As shown, the filter circuit 10 includes three sets of capacitor circuits 300 and two inductor circuits 400; the three sets of capacitor circuits 300 include a first-stage capacitor circuit 310, a second-stage capacitor circuit 320, and a third-stage capacitor circuit 330 arranged in sequence and spaced apart along a flow direction x1; the two inductor circuits 400 include a first-stage inductor circuit 410 and a second-stage inductor circuit 420, the first-stage inductor circuit 410 being arranged between the first-stage capacitor circuit 310 and the second-stage capacitor circuit 320, and the second-stage inductor circuit 420 being arranged between the second-stage capacitor circuit 320 and the third-stage capacitor circuit 330.

[0034] Specifically, the first-stage capacitor circuit 310, the first-stage inductor circuit 410, the second-stage capacitor circuit 320, the second-stage inductor circuit 420, and the third-stage capacitor circuit 330 are arranged in sequence along the flow direction x1, thus forming the filter circuit 10. The first-stage capacitor circuit 310 includes two Y-type capacitors and three X-type capacitors, namely Y-type capacitor C1, Y-type capacitor C2, X-type capacitor C3, X-type capacitor C4, and X-type capacitor C5, and the circuit connection manner can be referred to FIG. 2, which will not be described in detail herein. Figure 1 The second-stage capacitor circuit 320 includes two Y-type capacitors and two X-type capacitors, namely Y-type capacitor C8, Y-type capacitor C9, X-type capacitor C6, and X-type capacitor C7, and the circuit connection manner can be referred to FIG. 3, which will not be described in detail herein. Figure 1 The third-stage capacitor circuit 330 includes two Y-type capacitors and one X-type capacitor, namely Y-type capacitor C10, Y-type capacitor C11, and X-type capacitor C12, and the circuit connection manner can be referred to FIG. 4, which will not be described in detail herein. Figure 1

[0035] Of course, in other embodiments, the number and capacitance value of the Y-type capacitors and the X-type capacitors of each capacitor circuit 300 can be set and selected according to actual needs. The number of capacitor circuits 300 and the number of inductor circuits 400 can also be selected according to actual needs, which will not be described in detail herein.

[0036] Alternatively, the inductance value of the first-stage inductor circuit 410 is greater than the inductance value of the second-stage inductor circuit 420. Specifically, the common-mode interference of the working voltage is the largest before being connected to the filter circuit 10, and therefore, the inductor circuit 400 with a larger inductance value arranged close to the input end of the filter circuit 10 can effectively reduce the probability of the common-mode interference of the working voltage still existing after being output by the filter circuit 10, and thus effectively improve the stability of the working voltage, so as to effectively improve the working stability of the electric drive controller. For example, in the embodiment of the present application, the first-stage inductor circuit 410 can be a ferrite magnetic ring 22, and the second-stage inductor circuit 420 can be a nanocrystalline magnetic ring 22.

[0037] As​Figure 2 、 Figure 3 and Figure 4 As shown in the above, the application provides a filter assembly 20, which comprises two copper bars 21 (copper bar 21a, copper bar 21b), multiple sets of capacitor filter assemblies 23 and at least one magnetic ring 22. One of the two copper bars 21 is used as a first bus 100 for accessing a first level signal, and the other is used as a second bus 200 for accessing a second level signal. The two copper bars 21 are arranged side by side and spaced apart. The copper bar 21 comprises a straight bar section 210 extending along a first direction x2 and two overlapping sections (a first overlapping section 220 and a second overlapping section 230) connected to both ends of the straight bar section 210. The straight bar sections 210 of the two copper bars 21 are arranged in an overlapping manner along a second direction x3 perpendicular to the main surface of the straight bar section 210. The at least one magnetic ring 22 is arranged around the straight bar sections 210 of the two copper bars 21. The magnetic ring 22 is used as an inductor circuit 400 to perform high-frequency filtering processing on the first level signal and the second level signal. The capacitor filter assembly 23 is electrically connected to the two copper bars 21 respectively. The capacitor filter assembly 23 is used to form a capacitor circuit 300 to perform high-frequency filtering processing on the first level signal and the second level signal. The magnetic ring 22 is located between two adjacent sets of capacitor filter assemblies 23 along the first direction x2, so that the inductor circuit 400 is located between two adjacent capacitor circuits 300 along the flow direction x1 of the first level signal or the second level signal.

[0038] Specifically, the capacitor filter assembly 23 is an assembly for forming the capacitor circuit 300 described above, which comprises two Y-type capacitors and at least one X-type capacitor. The specific circuit connection structure can be referred to the above content. The magnetic ring 22 is arranged around the straight bar sections 210 of the two copper bars 21 to access the first bus 100 and the second bus 200 as the inductor circuit 400 described above. The magnetic ring 22, the capacitor filter assembly 23 and the two copper bars 21 are connected by the circuit connection mode shown in the above to form the filter circuit 10 described above. Figure 1

[0039] As shown in the above, the application provides a filter assembly 20, which comprises two copper bars 21 (copper bar 21a, copper bar 21b), multiple sets of capacitor filter assemblies 23 and at least one magnetic ring 22. One of the two copper bars 21 is used as a first bus 100 for accessing a first level signal, and the other is used as a second bus 200 for accessing a second level signal. The two copper bars 21 are arranged side by side and spaced apart. The copper bar 21 comprises a straight bar section 210 extending along a first direction x2 and two overlapping sections (a first overlapping section 220 and a second overlapping section 230) connected to both ends of the straight bar section 210. The straight bar sections 210 of the two copper bars 21 are arranged in an overlapping manner along a second direction x3 perpendicular to the main surface of the straight bar section 210. The at least one magnetic ring 22 is arranged around the straight bar sections 210 of the two copper bars 21. The magnetic ring 22 is used as an inductor circuit 400 to perform high-frequency filtering processing on the first level signal and the second level signal. The capacitor filter assembly 23 is electrically connected to the two copper bars 21 respectively. The capacitor filter assembly 23 is used to form a capacitor circuit 300 to perform high-frequency filtering processing on the first level signal and the second level signal. The magnetic ring 22 is located between two adjacent sets of capacitor filter assemblies 23 along the first direction x2, so that the inductor circuit 400 is located between two adjacent capacitor circuits 300 along the flow direction x1 of the first level signal or the second level signal. Figure 4 ​As shown, in structure, the copper bar 21 includes a straight bar section 210 extending along a first direction x2, and two overlap sections connected to two ends of the straight bar section 210, a first overlap section 220 serving as an input end of the filter circuit 10 to be connected with a power element such as an IGBT to access a working voltage, and a second overlap section 230 serving as an output end of the filter circuit 10 to be connected with an electric drive controller to input a working voltage processed by filtering to the electric drive controller. The two copper bars 21 are arranged side by side, and along a second direction x3 perpendicular to a main surface of the straight bar section 210, the straight bar sections 210 of the two copper bars 21 are arranged in overlap, so as to effectively reduce the spatial volume occupancy of the two copper bars 21, thereby enabling a magnetic ring 22 with a smaller width size (the width size refers to the size along the second direction x3, hereinafter) to be sleeved on the straight bar sections 210 of the two copper bars 21, and further effectively reducing the overall width size of the filter assembly 20 to effectively reduce the overall spatial volume of the filter assembly 20.

[0040] Optionally, as shown in Figure 2 、 Figure 3 and Figure 4 , the filter assembly 20 includes three sets of capacitor filter assemblies 23 and two magnetic rings 22, the three sets of capacitor filter assemblies 23 include a first-stage capacitor filter assembly 23a, a second-stage capacitor filter assembly 23b and a third-stage capacitor filter assembly 23c arranged in sequence and at intervals along the first direction x2, and the two magnetic rings 22 are sleeved on the straight bar sections 210 of the two copper bars 21, the two magnetic rings 22 include a first magnetic ring 22a and a second magnetic ring 22b arranged at intervals along the first direction x2, the first magnetic ring 22a is located between the first-stage capacitor filter assembly 23a and the second-stage capacitor filter assembly 23b along the first direction x2, and the second magnetic ring 22b is located between the second-stage capacitor filter assembly 23b and the third-stage capacitor filter assembly 23c along the first direction x2.

[0041] Specifically, the first-stage capacitor filter assembly 23a, the second-stage capacitor filter assembly 23b and the third-stage capacitor filter assembly 23c form the first-stage capacitor circuit 310, the second-stage capacitor circuit 320 and the third-stage capacitor circuit 330 respectively as set forth in the foregoing content. The first magnetic ring 22a and the second magnetic ring 22b form the first-stage inductor circuit 410 and the second-stage inductor circuit 420 respectively as set forth in the foregoing content. As shown in Figure 2 and Figure 3As shown, the capacitor filter assembly 23 composed of two Y-type capacitors is arranged on both sides of the magnetic ring 22 along the flow direction x1, so that the first level signal and the second level signal can be pre-inhibited from the partial mode interference signals mixed therein by the capacitor filter assembly 23 before flowing through the magnetic ring 22, thereby reducing the working loss of the inductive circuit 400, balancing the temperature rise of the magnetic ring 22, the copper bar 21 and the capacitor filter assembly 23 in the filter assembly 20, and effectively improving the working performance and reliability of the filter assembly 20. For example, in the embodiment of the present application, the first magnetic ring 22a is a ferrite magnetic ring, and the second magnetic ring 22b is a nanocrystalline magnetic ring, wherein the ferrite magnetic ring is located between the first-stage capacitor circuit 310 and the second-stage capacitor circuit 320, and the nanocrystalline magnetic ring is located between the second-stage capacitor circuit 320 and the third-stage capacitor circuit 330, so that the first-stage capacitor circuit 310 can pre-inhibit the partial mode interference signals mixed in the first level signal and the second level signal to reduce the working loss of the ferrite magnetic ring, and the second-stage capacitor circuit 320 can pre-inhibit the partial mode interference signals mixed in the first level signal and the second level signal to reduce the working loss of the nanocrystalline magnetic ring.

[0042] Optionally, the second-stage capacitor filter assembly 23b includes a circuit board 232 and a plurality of safety capacitors, the circuit board 232 is electrically connected with the two copper bars 21 respectively; the plurality of safety capacitors are electrically connected with the circuit board respectively to form the second-stage capacitor circuit 320, and a part of the plurality of safety capacitors are arranged on one side of the straight bar section 210 along the second direction x3, and the other part are arranged on the other side of the straight bar section 210 along the second direction x3.

[0043] Specifically, the plurality of safety capacitors in the second-stage capacitor filter assembly 23b include two Y-type capacitors (Y-type capacitor C9 and Y-type capacitor C8 respectively) and two X-type capacitors (X-type capacitor C6 and X-type capacitor C7 respectively), wherein the two Y-type capacitors and the two X-type capacitors are electrically connected by the circuit board to form the second-stage capacitor circuit 320. The two Y-type capacitors and the two X-type capacitors can be arranged on both sides of the straight bar section 210 along the second direction x3 according to actual needs, so as to effectively improve the space utilization of the straight bar section 210 of the two copper bars 21 along the second direction x3. For example, in some embodiments, the two Y-type capacitors can be arranged on the side of the straight bar section 210 of the copper bar 21a away from the copper bar 21b along the second direction x3, and the two X-type capacitors can be arranged on the side of the straight bar section 210 of the copper bar 21b away from the copper bar 21a along the second direction x3. Or, as shown in the embodiment of the present application, the two Y-type capacitors can be arranged on the side of the straight bar section 210 of the copper bar 21b away from the copper bar 21a along the second direction x3, and the two X-type capacitors can be arranged on the side of the straight bar section 210 of the copper bar 21a away from the copper bar 21b along the second direction x3. Figure 3As shown, the X-type capacitor C6 and the Y-type capacitor C8 can be arranged on the side of the straight section 210 of the copper bar 21b facing away from the copper bar 21a along the second direction x3, and the X-type capacitor C7 and the Y-type capacitor C9 can be arranged on the side of the straight section 210 of the copper bar 21a facing away from the copper bar 21b along the second direction x3.

[0044] Optionally, as shown in Figure 2 , Figure 3 and Figure 4 , in some embodiments, the first-stage capacitor filtering assembly 23a includes a circuit board 231, two Y-type capacitors (including the Y-type capacitor C1 and the Y-type capacitor C2), and three X-type capacitors (including the X-type capacitor C3, the X-type capacitor C4, and the X-type capacitor C5), wherein the circuit board 231 is lapped on the first lapped section 220 of the two copper bars 21 and is electrically connected to the two copper bars 21 respectively, the three X-type capacitors are arranged on the circuit board 231 and are connected to the circuit board 231, and the two Y-type capacitors are electrically connected to the first lapped section 220 of the two copper bars 21 respectively, thereby forming the first-stage capacitor circuit 310.

[0045] Optionally, as shown in Figure 2 , Figure 3 and Figure 4 , in some embodiments, the first lapped section 220 and the straight section 210 of the copper bar 21 are integrally formed, and the second lapped section 230 is lapped on the end of the straight section 210 facing away from the first lapped section 220 by welding. The third-stage capacitor filtering assembly 23c includes a circuit board (not labeled in the figure), two Y-type capacitors (including the Y-type capacitor C10 and the Y-type capacitor C11), and one X-type capacitor (i.e., the X-type capacitor C12), wherein the circuit board is lapped on the second lapped section 230 and is electrically connected to the two copper bars 21 respectively, the two Y-type capacitors and the one X-type capacitor are arranged on the circuit board and are connected to the circuit board, thereby forming the third-stage capacitor circuit 330.

[0046] Optionally, the filtering assembly 20 includes a housing 24, the housing 24 is provided with a plurality of mounting portions (not labeled in the figure), the copper bars 21, the capacitor filtering assemblies 23, and the magnetic rings 22 are arranged in the corresponding mounting portions, and the housing 24 is used to provide structural support and electrical isolation for the copper bars 21, the capacitor filtering assemblies 23, and the magnetic rings 22.

[0047] Optionally, the filtering assembly 20 can be manufactured by the following process flow.

[0048] First step: the straight section 210 and the first lapped section 220 of the copper bar 21 are stamped by stamping.

[0049] Second step: surface treatment is performed on the straight section 210 and the first lapped section 220 of the copper bar 21.

[0050] Third step: ground bushing riveting.

[0051] Fourth step: forming the shell 24 on the circumferential side of the two copper bars 21 through the injection molding process.

[0052] Fifth step: assembling the nanocrystal magnetic ring.

[0053] Sixth step: cleaning the laser welding surface of the straight row section 210.

[0054] Seventh step: respectively welding the two second lap sections 230 on the corresponding straight row sections 210 through the laser welding technology.

[0055] Eighth step: assembling the first-stage capacitor filter assembly 23a, the second-stage capacitor filter assembly 23b and the third-stage capacitor filter assembly 23c into the corresponding installation parts of the shell 24, and welding the safety capacitor and the circuit board.

[0056] Ninth step: assembling the ferrite magnetic ring.

[0057] Tenth step: performing the functional inspection and appearance inspection on the filter, and finally packing and warehousing.

[0058] It is worth noting that the drawings in the present application are only used to show the structural relationship and connection relationship of the utility model product, and do not limit the specific structural size of the utility model product.

[0059] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A filter circuit, characterized by, A filter assembly for an electric drive controller of a vehicle, comprising: a first busbar for accessing a first level signal; a second busbar for accessing a second level signal; a plurality of capacitor circuits arranged in series along a flow direction of the first level signal or the second level signal, and connected between the first busbar and the second busbar; the capacitor circuits are configured to perform high-frequency filtering on the first level signal and the second level signal; at least one inductor circuit arranged between two adjacent capacitor circuits along the flow direction and connected to the first busbar and the second busbar; the inductor circuit is configured to perform high-frequency filtering on the first level signal and the second level signal.

2. The filter circuit of claim 1, wherein, The capacitor circuit comprises: a first Y-type capacitor with a first signal end connected to the first busbar and a second signal end grounded; a second Y-type capacitor with a first signal end connected to the second busbar and a second signal end grounded.

3. The filter circuit of claim 2, wherein, The capacitor circuit further comprises at least one X-type capacitor with a first signal end connected to the first busbar and a second signal end connected to the second busbar.

4. The filter circuit of claim 3, wherein, The number of X-type capacitors in the capacitor circuit decreases in sequence along the flow direction.

5. The filter circuit according to any one of claims 1 to 4, characterized in that The filter circuit comprises three capacitor circuits and two inductor circuits; the three capacitor circuits comprise a first-stage capacitor circuit, a second-stage capacitor circuit, and a third-stage capacitor circuit arranged in series along the flow direction; the two inductor circuits comprise a first-stage inductor circuit arranged between the first-stage capacitor circuit and the second-stage capacitor circuit, and a second-stage inductor circuit arranged between the second-stage capacitor circuit and the third-stage capacitor circuit.

6. The filter circuit of claim 5, wherein, The inductance value of the first-stage inductor circuit is greater than that of the second-stage inductor circuit.

7. A filter assembly characterized by, It comprises: two copper bars, one of which is used as a first busbar for accessing a first level signal, and the other of which is used as a second busbar for accessing a second level signal; the two copper bars are arranged in series along a first direction, and each copper bar comprises a straight section extending along the first direction and two overlapping sections connected to both ends of the straight section; the straight sections of the two copper bars are arranged in overlapping manner along a second direction perpendicular to the main surface of the straight section; at least one magnetic ring arranged around the straight sections of the two copper bars; the magnetic ring is used as an inductor circuit to perform high-frequency filtering on the first level signal and the second level signal; a plurality of capacitor filter assemblies electrically connected to the two copper bars respectively; the capacitor filter assemblies are configured to form capacitor circuits to perform high-frequency filtering on the first level signal and the second level signal; wherein the magnetic ring is located between two adjacent capacitor filter assemblies along the first direction, so that the inductor circuit is located between two adjacent capacitor circuits along the flow direction of the first level signal or the second level signal.

8. The filter assembly of claim 7, wherein, The filter assembly comprises three sets of the capacitive filter assembly and two magnetic rings, the three sets of the capacitive filter assembly comprise a first-stage capacitive filter assembly, a second-stage capacitive filter assembly and a third-stage capacitive filter assembly which are sequentially and spaced apart along the first direction, the two magnetic rings are arranged around the straight sections of the two copper bars, the two magnetic rings comprise a first magnetic ring and a second magnetic ring which are spaced apart along the first direction, the first magnetic ring is located between the first-stage capacitive filter assembly and the second-stage capacitive filter assembly along the first direction, and the second magnetic ring is located between the second-stage capacitive filter assembly and the third-stage capacitive filter assembly along the first direction.

9. The filter assembly of claim 8, wherein, The second-stage capacitive filter assembly comprises: a circuit board which is electrically connected with the two copper bars respectively; a plurality of safety capacitors which are electrically connected with the circuit board respectively to form a second-stage capacitive circuit, and a part of the plurality of safety capacitors are arranged on one side of the straight section along the second direction, and another part of the plurality of safety capacitors are arranged on the other side of the straight section along the second direction.

10. The filter assembly of claim 7, wherein, Further comprising: a shell which is provided with a plurality of mounting portions, the copper bars, the capacitive filter assembly and the magnetic rings are arranged in the corresponding mounting portions, and the shell is used for providing structural support and electrical isolation for the copper bars, the capacitive filter assembly and the magnetic rings.

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