Hybrid filter for inverter of electric vehicle

Abstract

The embodiment of the utility model provides a hybrid filter for an inverter of an electric automobile. The hybrid filter for the inverter of the electric vehicle comprises an active filter and a passive filter, and an electric input end of the active filter is coupled with an electric output end of a power battery of the electric vehicle; the electric output end of the active filter is coupled with the electric input end of the passive filter; and an electric output end of the passive filter is coupled with an electric input end of an inverter, and an electric output end of the inverter is coupled with a driving motor of the electric automobile.

Description

Technical Field

[0001] This invention generally relates to the field of filtering technology for electric vehicles, and more specifically, to a hybrid filter for inverters of electric vehicles. Background Technology

[0002] With the rapid development of electric vehicle technology, increasingly stringent requirements have been placed on electromagnetic compatibility (EMC). For battery electric vehicles (BEVs) and hybrid electric vehicles (HEVs), the electric powertrain system is the main source of electromagnetic fields, thus requiring suppression of the electromagnetic fields conducted by the electric powertrain system.

[0003] In related technologies, passive filters are typically used for noise removal in electric vehicle inverters. However, passive filters require larger magnetic components to filter low-frequency noise, increasing both their size and weight. Furthermore, passive filters are not effective at suppressing high-power low-frequency noise and are prone to saturation, thus their filtering performance in electric vehicle inverter scenarios needs improvement. Therefore, a filtering solution more suitable for electric vehicle inverters is needed. Utility Model Content

[0004] In view of the above, this utility model embodiment provides a hybrid filter for an inverter in an electric vehicle. Using this hybrid filter for an electric vehicle inverter, an active filter can be used to filter low-frequency noise, and a passive filter can be used to filter high-frequency noise, thus fully combining the advantages of active and passive filters. This improves the filtering effect across the entire frequency band while effectively reducing the size and weight of the filter. Furthermore, the filtering effect can be further enhanced by the orderly arrangement of the active and passive filters.

[0005] According to one aspect of the present invention, a hybrid filter for an inverter of an electric vehicle is provided, comprising: an active filter and a passive filter, wherein the electrical input terminal of the active filter is coupled to the electrical output terminal of the power battery of the electric vehicle; the electrical output terminal of the active filter is coupled to the electrical input terminal of the passive filter; and the electrical output terminal of the passive filter is coupled to the electrical input terminal of the inverter, the electrical output terminal of the inverter being coupled to the drive motor of the electric vehicle.

[0006] According to another aspect of the present invention, an electric vehicle is provided, comprising: a hybrid filter as described above; a power battery configured to output voltage to an active filter in the hybrid filter; an inverter configured to convert the voltage after noise removal by the hybrid filter into an AC voltage and provide the AC voltage to the drive motor; and the drive motor configured to drive the electric vehicle to move using the AC voltage. Attached Figure Description

[0007] A further understanding of the nature and advantages of this specification can be achieved by referring to the following figures. In the figures, similar components or features may have the same reference numerals.

[0008] Figure 1 An exemplary scenario of a hybrid filter for an inverter for an electric vehicle, according to an embodiment of this specification, is shown.

[0009] Figure 2 A block diagram of an example of a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown.

[0010] Figure 3 An equivalent circuit diagram is shown as an example of common-mode noise analysis in an application scenario of a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification.

[0011] Figure 4 A block diagram of an example active filter in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown.

[0012] Figure 5 An equivalent circuit diagram of yet another example of an active filter in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown.

[0013] Figure 6 An equivalent circuit diagram of an example passive filter in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown.

[0014] Figure 7 A block diagram of an example electric vehicle according to an embodiment of this specification is shown.

[0015] Figure 8 A block diagram illustrating an example of electronic equipment in an electric vehicle according to an embodiment of this specification is shown. Detailed Implementation

[0016] The subject matter described herein will be discussed below with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein, and are not intended to limit the scope, applicability, or examples set forth in the claims. The function and arrangement of the elements discussed may be changed without departing from the scope of the embodiments described herein. Various processes or components may be omitted, substituted, or added as needed in the various examples. Furthermore, features described in some examples may be combined in other examples.

[0017] As used herein, the term "comprising" and its variations are open terms meaning "including but not limited to". The term "based on" means "at least partially based on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other definitions, whether explicit or implicit, may be included below. Unless explicitly indicated by the context, the definition of a term shall remain consistent throughout the specification.

[0018] This specification presents an embodiment of a hybrid filter for an inverter in an electric vehicle. In this hybrid filtering scheme for an electric vehicle inverter, an active filter is used to filter low-frequency noise, and a passive filter is used to filter high-frequency noise, thus fully combining the advantages of both active and passive filters. This improves the filtering effect across the entire frequency band while effectively reducing the size and weight of the filter. Furthermore, the filtering effect can be further enhanced by the orderly arrangement of the active and passive filters.

[0019] The hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification will now be described in detail with reference to the accompanying drawings.

[0020] Figure 1 An exemplary scenario 100 of a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown.

[0021] like Figure 1As shown, the hybrid filter for an electric vehicle inverter in this embodiment can be applied to an electric vehicle inverter. In some examples, an electric vehicle may include a power battery 110, a hybrid filter 120, a DC / AC inverter 130, a drive motor 140, a DC / DC converter 150, and a low-voltage battery 160. The power battery 110 can provide DC power input to the DC / AC inverter 130, which converts the DC power into AC power to supply the drive motor 140. Since the power energy provided by the power battery 110 to the DC / AC inverter 130 is not standard DC power, a hybrid filter 120 is needed to filter the power energy provided by the power battery 110. Therefore, the filtering effect of the hybrid filter 120 is of great significance for meeting the electromagnetic compatibility requirements of electric vehicles and ensuring vehicle driving safety. In some examples, the power battery 110 can also provide a high-voltage DC input to the DC / DC converter 150, which converts the high-voltage DC into low-voltage DC to supply the low-voltage battery 160 (e.g., a 12V battery). It is understood that the electric vehicle may also include a corresponding controller and / or control system to manage the DC / AC inverter 130, the DC / DC converter 150, and the power battery 110.

[0022] It should be understood that the embodiments in this specification are not limited to the exemplary scenarios described above, but can also be applied to any variation of these exemplary scenarios and any other applicable scenarios.

[0023] Figure 2 A block diagram 200 shows an example of a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification.

[0024] like Figure 2 As shown, the hybrid filter 220 may include an active filter 221 and a passive filter 222. The electrical input terminal of the active filter 221 can be coupled to the electrical output terminal of the power battery 210 of the electric vehicle, thereby obtaining electrical energy from the power battery 210. The electrical output terminal of the active filter 221 can be coupled to the electrical input terminal of the passive filter 222, thereby providing the actively filtered electrical energy to the passive filter 222. The electrical output terminal of the passive filter 222 can be coupled to the electrical input terminal of the inverter 230, thereby providing the actively and passively filtered electrical energy to the inverter 230. The electrical output terminal of the inverter 230 can be coupled to the drive motor 240 of the electric vehicle, thereby providing the AC power obtained through the inverter 230 to the drive motor 240 to drive the electric vehicle.

[0025] In this embodiment, low-frequency noise can be filtered using an active filter 221. In some examples, the active filter 221 can be designed as a feedforward filter, first extracting the noise current from the main circuit and feeding it to the amplifier circuit. The amplifier circuit can then amplify the weak current signal in reverse, and finally inject the amplified signal back into the main circuit to cancel out the noise generated in the main circuit.

[0026] It should be understood that Figure 2 The various components shown are exemplary, and embodiments of this disclosure will also cover any modifications to the hybrid filter. For example, in some implementations, the hybrid filter may also include other functional units, such as control units, switching devices, etc.

[0027] Figure 3 An equivalent circuit diagram 300 is shown as an example of common-mode noise analysis in an application scenario of a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification.

[0028] like Figure 3 As shown, in the application scenario of a hybrid filter for an inverter in an electric vehicle, the power battery 310 can supply power to the inverter 350 via a copper busbar. Between the copper busbar and the inverter 350, a hybrid filter 340 comprising an active filter 341 and a passive filter 342 can be installed. The inverter 350 converts the DC power to AC power to supply power to the drive motor. In some examples, a LISN (Line Impedance Stabilization Network) 320 can be further installed between the power battery 310 and the copper busbar to isolate electromagnetic interference, provide stable test impedance, and also serve as a filter to some extent.

[0029] In some examples, the LISN320 can consist of an inductor L1, capacitors C1 and C2, and a resistor R1. The two ends of capacitor C2 are connected to the first terminal of inductor L1 and ground, respectively. Capacitor C1 is connected in series with resistor R1, with the other end of capacitor C1 connected to the second terminal of inductor L1, and the other end of resistor R1 connected to ground.

[0030] In some examples, inductor 330 can be used to represent a copper busbar. In one example, if the inductance of a single copper busbar is L... DC Then the inductance value L2 of inductor 330 can be 1 / 2L DC .

[0031] In some examples, in inverter 350, capacitors C3 and C4 and inductor L3 can be used to represent the capacitance at the DC input, the capacitance at the AC output, and the inductance to ground, respectively. In one example, if the capacitance at each end of the DC input is C... par,DC The capacitance of each phase at the AC output terminal is C. par,Ph The inductance to ground is L. Ground Then the capacitance value of capacitor C3 can be 2C. par,DC The capacitance value of C4 can be 3C. par,Ph The inductance value of inductor L3 can be L Ground .

[0032] In some examples, inductor 360 can be used to represent a drive motor. In one example, if the single-phase inductance of the drive motor is L... Motor Then the inductance value L4 of inductor 360 can be 1 / 3L Motor Load 370 can be used to represent parasitic parameters between the stator and housing of a drive motor. In one example, if the single-phase capacitance between the stator and housing of the drive motor is C... Load The single-phase resistance is R. Load Then the capacitance value of capacitor C5 can be 3C. Load The resistance value of resistor R2 can be 1 / 3R. Load .

[0033] Based on the equivalent circuit described above, the noise generated by the inverter 350 flows back to the circuit where the power battery 310 supplies power to the inverter 350 through the equipotential point (e.g., ground). The inventors discovered that the noise generated by inverters used in electric vehicles is mainly concentrated in the 1MHz to 3MHz frequency band, and prioritizing the suppression of noise in this frequency band can also simultaneously suppress the higher harmonics generated by it. Therefore, arranging the active filter, passive filter, and inverter in sequence can significantly improve the overall filtering effect on both low-frequency and high-frequency noise.

[0034] Figure 4 A block diagram 400 shows an example of an active filter in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification.

[0035] like Figure 4As shown, the power battery 410 can supply voltage (e.g., 800V) to the high-voltage bus 420. The active filter 430 may include a sensing circuit 431, an amplifier circuit 432, and a signal injection circuit 433. The sensing circuit 431 can be configured to acquire electrical signals from the high-voltage bus 420, which is coupled to the electrical output terminal of the power battery 410. The amplifier circuit 432 may include a cascaded preamplifier circuit 4321 and a power amplifier circuit 4322. In some examples, the preamplifier circuit 4321 may primarily be used to inversely amplify the voltage signal. The power amplifier circuit 4322 may primarily be used to amplify the power, thereby obtaining a compensation signal that is close in magnitude but opposite in direction to the acquired noise signal. The signal injection circuit 433 can be configured to input the electrical signal, which has been inversely amplified by the amplifier circuit 432, into the high-voltage bus 420.

[0036] pass Figure 4 The active filter provided in this embodiment can filter low-frequency (e.g., frequency less than 3MHz) noise in the voltage supplied by the power battery 410. Then, a passive filter 440 is used to filter high-frequency (e.g., frequency greater than 3MHz) noise, thereby providing the filtered electrical signal to the inverter 450.

[0037] Figure 5 An equivalent circuit diagram 500 is shown for yet another example of an active filter in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification. Figure 5 The active filter 510 shown in the figure can be Figure 4 A specific example of the active filter 430 is shown in the figure.

[0038] like Figure 5 As shown, the sensing circuit may include a shunt resistor R. sense and sampling capacitor C sense Sampling capacitor C sense The two ends can be connected to the high-voltage bus HV+ and the shunt resistor R respectively. sense The first terminal (i.e., the current-flow terminal). Shunt resistor R sense The second terminal (i.e., the current outflow terminal) is connected to ground. The shunt resistor R... sense and sampling capacitor C sense It can be used to form a high-pass filter to filter frequencies greater than the cutoff frequency f. g =1 / (2π·R) sense ·C sense Electrical signals (e.g., current) in the frequency band of the sampling capacitor C pass through the sampling capacitor C. sense With shunt resistor R sense The connection terminal (i.e., the shunt resistor R) sense The first terminal) is output to the preamplifier circuit.

[0039] In some examples, the preamplifier circuit may include an operational amplifier. The power amplifier circuit may include a complementary push-pull amplifier circuit. The electrical output of the operational amplifier may be coupled to the electrical input of the complementary push-pull amplifier circuit, and the electrical output of the complementary push-pull amplifier circuit may serve as a feedback signal input to the feedback path of the operational amplifier.

[0040] In some examples, such as Figure 5 As shown, the preamplifier circuit may include an operational amplifier and a bias current compensation resistor R. B and feedback resistor R F For example, the positive input terminal of an operational amplifier can be connected to ground, while the negative input terminal can be connected through a bias current compensation resistor R. B It is connected to the aforementioned sensing circuit. In one example, it can be connected via sampling capacitor C. sense With shunt resistor R sense The connection point will be greater than the cutoff frequency f. g The electrical signal passes through the bias current compensation resistor R. B The signal is input to the negative input terminal of the operational amplifier. The amplified signal is then passed through a complementary push-pull amplifier circuit for further power amplification at its output terminal. Simultaneously, the amplified signal can be used as a feedback signal through the feedback resistor R. F Then input it to the negative input terminal of the operational amplifier.

[0041] In some examples, the feedback path of the operational amplifier may include a feedback resistor and a feedback capacitor connected in parallel. By setting the aforementioned feedback capacitor, the effects of parasitic capacitance at the negative input of the operational amplifier can be effectively compensated, preventing oscillation and suppressing high-frequency noise to some extent.

[0042] In some examples, a complementary push-pull amplifier circuit may include two complementary pairs of Darlington transistors. In one example, each Darlington transistor pair may consist of discrete power bipolar junction transistors (BJTs). Each Darlington transistor pair can be biased by a resistor R. bias The diode voltage drop is used for biasing. In one example, the diode voltage drop can be provided by two diodes connected in series. The emitter resistor R can be set at the emitter of the second-stage transistor in each Darlington transistor pair. E In one example, a connection resistor can be placed between the base and emitter of the second-stage transistor in each Darlington transistor pair. This can accelerate charge release, improve switching response speed, and thus optimize circuit performance. In one example, the value of the connection resistor can be 120Ω. In one example, it can be controlled by ±V SupProvide power (e.g., 12V or 18V) to the above complementary push-pull amplifier circuit.

[0043] In some examples, the signal injection circuit may include a coupling capacitor C. inj Coupling capacitor C inj The amplified electrical signal obtained through the above two stages can be re-injected into the high-voltage bus through a charging and discharging process to cancel out noise signals. In one example, the coupling capacitor C... inj It can include several capacitors connected in parallel, thereby reducing the combined series inductance and thus expanding the bandwidth of the signal injection circuit.

[0044] In some examples, a coupling capacitor C can also be set. inj The shunt resistor R connected in series shunt It is used to measure the injected current during operation.

[0045] Figure 6 An equivalent circuit diagram of an example of a passive filter 600 in a hybrid filter for an inverter for an electric vehicle according to an embodiment of this specification is shown. Figure 6 The passive filter 600 shown in the figure can be Figure 4 A specific example of the passive filter 440 shown in the figure.

[0046] like Figure 6 As shown, the passive filter 600 may include a common-mode choke, a differential-mode capacitor, and a common-mode capacitor bank. In some examples, several common-mode capacitor banks, common-mode chokes, and differential-mode capacitors may be connected in sequence. For example, the passive filter 600 may include two stages of common-mode chokes (L1 and L2), three stages of common-mode capacitor banks (C1-C4, C6, C7, and C9-C12), and three stages of differential-mode capacitors (C5, C8, and C13).

[0047] use Figures 1-6 The hybrid filter disclosed in this paper for an inverter in an electric vehicle utilizes an active filter to filter low-frequency noise and a passive filter to filter high-frequency noise, thus fully combining the advantages of both active and passive filters. This improves the filtering effect across the entire frequency band while effectively reducing the size and weight of the filter. Furthermore, the filtering effect can be further enhanced by the orderly arrangement of the active and passive filters.

[0048] Figure 7 A block diagram of an example electric vehicle 700 according to an embodiment of this specification is shown.

[0049] like Figure 7As shown, the electric vehicle 700 may include a power battery 710, a hybrid filter 720, an inverter 730, and a drive motor 740. The hybrid filter 720 may refer to the embodiments described above. Figures 1-6 The relevant description is as follows: The power battery 710 can be configured to output voltage to the active filter in the hybrid filter 720. The inverter 730 can be configured to convert the voltage after noise filtering by the hybrid filter 720 into an AC voltage and supply the AC voltage to the drive motor 740. The drive motor 740 can be configured to drive the electric vehicle using the AC voltage.

[0050] It is understood that the specific descriptions of the power battery 710, hybrid filter 720, inverter 730, and drive motor 740 above can be found in the foregoing. Figures 1-6 The specific descriptions in the embodiments will not be repeated here.

[0051] The following describes the embodiments as described above. Figures 1-6 The specific workflow of the hybrid filter described herein is illustrated by way of example.

[0052] In step S810, an active filter can be used to filter out low-frequency noise output from the electric vehicle's power battery. In this embodiment, the frequency of the low-frequency noise does not exceed a preset frequency threshold, such as 1MHz or 3MHz.

[0053] In step S820, a passive filter can be used to filter out high-frequency noise from the voltage after low-frequency noise has been filtered out. The frequency of the high-frequency noise is greater than a preset frequency threshold.

[0054] In step S830, the voltage after filtering out high-frequency noise can be provided to the inverter so that the inverter can convert the voltage after filtering out low-frequency and high-frequency noise into AC voltage to drive the drive motor of the electric vehicle.

[0055] It should be noted that the specific operations of steps S810-S830 above can be found by referring to... Figures 1-6 The corresponding descriptions in [the relevant section] will not be repeated here.

[0056] Reference above Figures 1 to 7 An embodiment of a hybrid filter for an inverter for an electric vehicle, according to an embodiment of this specification, has been described.

[0057] Figure 8 A schematic diagram illustrating an example of an electronic device 800 in an electric vehicle according to an embodiment of this specification is shown.

[0058] like Figure 8As shown, the electronic device 800 may include at least one processor 810, a memory (e.g., non-volatile memory) 820, a RAM 830, and a communication interface 840, and the at least one processor 810, memory 820, RAM 830, and communication interface 840 are connected together via a bus 850. The at least one processor 810 executes at least one computer-readable instruction (i.e., the elements implemented in software above) stored or encoded in the memory.

[0059] In one embodiment, computer-executable instructions are stored in a memory that, when executed, cause at least one processor 810 to: filter out low-frequency noise in the voltage output from the power battery of the electric vehicle using the active filter, wherein the frequency of the low-frequency noise does not exceed a preset frequency threshold; filter out high-frequency noise in the voltage after low-frequency noise removal using the passive filter, wherein the frequency of the high-frequency noise is greater than the preset frequency threshold; and provide the voltage after high-frequency noise removal to the inverter so that the inverter converts the voltage after low-frequency and high-frequency noise removal into an AC voltage to drive the drive motor of the electric vehicle.

[0060] It should be understood that the computer-executable instructions stored in memory, when executed, cause at least one processor 810 to perform the various operations and functions described in the various embodiments of this specification.

[0061] According to one embodiment, a computer program product is provided, for example. The computer program product may include a computer program (i.e., the elements implemented in software described above), which, when executed by a processor, causes the processor to perform the various operations and functions described in the various embodiments of this specification.

[0062] Specifically, a system or apparatus equipped with a readable storage medium may be provided, on which software program code implementing the functions of any of the embodiments described above is stored, and the computer or processor of the system or apparatus can read and execute the instructions stored in the readable storage medium.

[0063] In this case, the program code read from the readable medium itself can implement the function of any of the above embodiments, so the machine-readable code and the readable storage medium storing the machine-readable code constitute part of this application.

[0064] The computer program code required for the operation of each part of this manual can be written in any one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB, .NET, and Python; conventional procedural programming languages ​​such as C, Visual Basic 2003, Perl, COBOL 2002, PHP, and ABAP; dynamic programming languages ​​such as Python, Ruby, and Groovy; or other programming languages. This program code can run on the user's computer, or as a standalone software package on the user's computer, or partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer can be connected to the user's computer via any network, such as a local area network (LAN) or wide area network (WAN), or connected to an external computer (e.g., via the Internet), or in a cloud computing environment, or used as a service, such as Software as a Service (SaaS).

[0065] Examples of readable storage media include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD-RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, program code can be downloaded from a server computer or the cloud via a communication network.

[0066] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0067] Not all steps and units in the above process and system structure diagrams are mandatory; some steps or units can be omitted as needed. The execution order of each step is not fixed and can be determined as required. The device structure described in the above embodiments can be a physical structure or a logical structure. That is, some units may be implemented by the same physical entity, or some units may be implemented by multiple physical entities, or they may be jointly implemented by certain components in multiple independent devices.

[0068] The term "exemplary" as used throughout this specification means "serving as an example, instance, or illustration" and does not imply that it is "preferred" or "advantageous" over other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0069] The optional embodiments of the present specification have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present specification are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present specification, various simple modifications can be made to the technical solutions of the embodiments of the present specification, and these simple modifications all fall within the protection scope of the embodiments of the present specification.

[0070] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A hybrid filter for an inverter in an electric vehicle, comprising: Active filters and passive filters, characterized in that, The electrical input terminal of the active filter is coupled to the electrical output terminal of the power battery of the electric vehicle. The electrical output terminal of the active filter is coupled to the electrical input terminal of the passive filter; and The electrical output terminal of the passive filter is coupled to the electrical input terminal of the inverter, and the electrical output terminal of the inverter is coupled to the drive motor of the electric vehicle.

2. The hybrid filter as described in claim 1, wherein, The active filter includes: a sensing circuit, an amplification circuit, and a signal injection circuit, wherein, The sensing circuit is configured to acquire electrical signals from a high-voltage bus coupled to the electrical output terminal of the power battery. The amplification circuit includes a cascaded preamplifier circuit and a power amplifier circuit, configured to amplify the acquired electrical signal in reverse; and The signal injection circuit is configured to input the electrical signal, which has been amplified in reverse by the amplification circuit, into the high-voltage bus.

3. The hybrid filter as described in claim 2, wherein, The sensing circuit includes a high-pass filter composed of a shunt resistor and a sampling capacitor. The two ends of the sampling capacitor are connected to the high-voltage bus and one end of the shunt resistor, respectively, and the other end of the shunt resistor is grounded. The sensing circuit outputs the collected electrical signal to the preamplifier circuit through the connection terminal of the sampling capacitor and the shunt resistor.

4. The hybrid filter as described in claim 2, wherein, The preamplifier circuit includes an operational amplifier, and the power amplifier circuit includes a complementary push-pull amplifier circuit. The electrical output terminal of the operational amplifier is coupled to the electrical input terminal of the complementary push-pull amplifier circuit, and the electrical output terminal of the complementary push-pull amplifier circuit is used as a feedback signal input to the feedback path of the operational amplifier.

5. The hybrid filter as described in claim 4, wherein, The complementary push-pull amplifier circuit includes two sets of complementary Darlington transistor pairs. Each Darlington transistor pair is biased by a bias resistor and a diode voltage drop. The feedback path of the operational amplifier includes a feedback resistor and a feedback capacitor connected in parallel.

6. The hybrid filter as described in claim 4, wherein, The signal injection circuit includes a coupling capacitor.

7. The hybrid filter as described in any one of claims 1 to 6, wherein, The passive filter includes a common-mode choke, a differential-mode capacitor, and a common-mode capacitor bank.

8. An electric vehicle, characterized in that, include: Hybrid filter as described in any one of claims 1 to 7; The power battery is configured to output voltage to the active filter in the hybrid filter; The inverter is configured to convert the voltage after noise removal by the hybrid filter into an AC voltage, and to provide the AC voltage to the drive motor; as well as The drive motor is configured to drive the electric vehicle to move using the AC voltage.

9. The electric vehicle according to claim 8, further comprising: An electronic device, characterized in that the electronic device comprises: At least one processor, and a memory coupled to the at least one processor, the memory storing a computer program, the at least one processor executing the computer program to control the hybrid filter to perform filtering.

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