An electromagnetic interference resistant system and electronic device

Abstract

This application relates to the field of electromagnetic compatibility technology and provides an anti-electromagnetic interference system and electronic device, comprising: a detection circuit, used to determine the center frequency and envelope information of an interference signal when an interference signal is detected in an input signal; a signal reconstruction circuit, electrically connected to the detection circuit, used to reconstruct an anti-interference signal corresponding to the interference signal based on the center frequency and envelope information of the interference signal, wherein the anti-interference signal is obtained by using the center frequency of the interference signal as the carrier frequency and performing signal amplitude modulation based on the envelope information; and a superposition circuit, electrically connected to the signal reconstruction circuit, used to invert the anti-interference signal and superimpose it with the input signal. This system can actively cancel out interference signals in the input signal and supports anti-electromagnetic interference in complex and dynamic interference environments.

Description

Technical Field

[0001] This application belongs to the field of electromagnetic compatibility technology, and in particular relates to an electromagnetic interference suppression system and electronic equipment. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the state in which electronic equipment can function normally in a common electromagnetic environment without causing unacceptable electromagnetic interference to other equipment. EMC is a critical challenge in electronic systems. Electromagnetic interference generated by electronic equipment or the external environment can couple into signal lines or power lines, affecting the overall performance of the electronic equipment and even causing it to malfunction.

[0003] Traditional methods for mitigating electromagnetic interference include, but are not limited to, shielding, filtering, and grounding.

[0004] However, none of these methods can support electromagnetic interference resistance in complex, dynamic interference environments. Summary of the Invention

[0005] This application provides an anti-electromagnetic interference system and electronic device that can actively cancel out interference signals in the input signal and support anti-electromagnetic interference in complex and dynamic interference environments.

[0006] In a first aspect, embodiments of this application provide an electromagnetic interference suppression system, comprising: The detection circuit is used to determine the center frequency and envelope information of the interference signal when an interference signal is detected in the input signal. The signal reconstruction circuit, electrically connected to the detection circuit, is used to reconstruct an anti-interference signal corresponding to the interference signal based on the center frequency and envelope information of the interference signal. The anti-interference signal is obtained by using the center frequency of the interference signal as the carrier frequency and performing signal amplitude modulation based on the envelope information. The superposition circuit, electrically connected to the signal reconstruction circuit, is used to invert the anti-interference signal and then superimpose it with the input signal.

[0007] In this application, the center frequency and envelope information of the interference signal are detected by the detection circuit, and an anti-interference signal with the same frequency and similar envelope information as the interference signal is reconstructed based on this. After phase inversion processing, the anti-interference signal is superimposed on the input signal. Since the anti-interference signal after phase inversion processing has the opposite phase to the interference signal, it can effectively cancel the interference in the input signal, realize automatic tracking of dynamically changing interference, and actively cancel it, thereby supporting anti-electromagnetic interference in complex and dynamic interference environments.

[0008] In one possible implementation of the first aspect, the detection circuit includes: The first detection unit is used to extract the frequency information of the input signal, identify interference signals based on the frequency information of the input signal, and determine the center frequency of the interference signal when interference signals are present in the input signal. The second detection unit is connected to the interference reference source and is used to extract the envelope information of the reference signal output by the interference reference source, and use the envelope information of the reference signal as the envelope information of the interference signal.

[0009] In one possible implementation of the first aspect, the first detection unit includes a frequency meter; The frequency meter is connected in the transmission path of the input signal to collect the input signal and perform time-frequency domain conversion on the input signal to extract the frequency information of the input signal. It also identifies interference signals based on the frequency information of the input signal and outputs the center frequency of the interference signal when interference signals are present in the input signal.

[0010] In one possible implementation of the first aspect, the second detection unit includes a first diode, a first resistor, a second resistor, and a first capacitor; The first terminal of the first diode is the input terminal of the second detection unit. The second terminal of the first diode is connected to the first terminal of the first resistor. The second terminal of the first resistor is connected to the first terminal of the second resistor. The second resistor and the first capacitor are connected in parallel. The second terminal of the second resistor is grounded. The first terminal of the first capacitor is the output terminal of the second detection unit.

[0011] In one possible implementation of the first aspect, the superimposed circuit includes: The phase inversion unit is used to invert the anti-interference signal. The delay unit is connected in the transmission path of the input signal and is used to delay the input signal. The delayed input signal is synchronized with the anti-interference signal after phase inversion in the time domain. The superposition unit, connected to the phase inversion unit and the delay unit respectively, is used to superimpose the delayed input signal and the anti-interference signal after phase inversion.

[0012] In one possible implementation of the first aspect, the phase inversion unit includes an inverse proportional operational amplifier.

[0013] In one possible implementation of the first aspect, the delay unit includes an adjustable delay circuit.

[0014] In one possible implementation of the first aspect, the superposition unit includes an adder; The first input terminal of the adder receives the delayed input signal, the second input terminal receives the anti-interference signal after inversion processing, and the output terminal of the adder outputs the superimposed signal.

[0015] In one possible implementation of the first aspect, the reconstruction circuit includes an analog signal reconstructor.

[0016] Secondly, embodiments of this application provide an electronic device, which includes the first aspect and any of the electromagnetic interference suppression systems described in the first aspect.

[0017] For the beneficial effects in the second aspect, please refer to the relevant explanation in the first aspect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an anti-electromagnetic interference system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the detection circuit in an anti-electromagnetic interference system provided in an embodiment of this application; Figure 3 A circuit diagram of a diode envelope detection circuit in an anti-electromagnetic interference system provided in this application embodiment; Figure 4 This is a schematic diagram of the superimposed circuit of an anti-electromagnetic interference system provided in an embodiment of this application; Figure 5 This is a schematic diagram of the circuit structure of an anti-electromagnetic interference system provided in an embodiment of this application. Detailed Implementation

[0020] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0021] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0022] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0024] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0026] Electromagnetic compatibility (EMC) refers to the state in which electronic equipment can function normally in a common electromagnetic environment without causing unacceptable electromagnetic interference to other equipment. EMC is a critical challenge in electronic systems. Electromagnetic interference generated by electronic equipment or the external environment can couple into signal lines or power lines, affecting the overall performance of the electronic equipment and even causing it to malfunction.

[0027] Traditional methods for mitigating electromagnetic interference include, but are not limited to, shielding, filtering, and grounding.

[0028] Shielding can be achieved through methods such as metal casings or shielded cables, utilizing metal to reflect or absorb electromagnetic waves, thereby blocking interference from high-frequency radiated carrier waves. Filtering can refer to the removal of interference signals through methods such as common-mode inductors, LC filter circuits, and filtered power lines. Grounding can refer to resolving interference through methods such as single-point grounding, multi-point grounding, and ground busbars.

[0029] However, none of these methods can support electromagnetic interference resistance in complex, dynamic interference environments.

[0030] Based on this, embodiments of this application provide an anti-electromagnetic interference system and electronic device. The system detects the center frequency and envelope information of the interference signal through a detection circuit, and reconstructs an anti-interference signal with the same frequency and similar envelope information as the interference signal. After phase inversion processing, the anti-interference signal is superimposed on the input signal. Since the anti-interference signal after phase inversion processing has the opposite phase to the interference signal, it can effectively cancel the interference in the input signal, realize automatic tracking of dynamically changing interference, and actively cancel it, thereby supporting anti-electromagnetic interference in complex and dynamic interference environments.

[0031] The electromagnetic interference suppression system provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings: Please see Figure 1 , Figure 1 A schematic diagram of an anti-electromagnetic interference system 10 provided in an embodiment of this application is shown. Figure 1 As shown, the electromagnetic interference suppression system 10 includes a detection circuit 101, a signal reconstruction circuit 102, and a superposition circuit 103.

[0032] The detection circuit 101 can be used to determine the center frequency and envelope information of the interference signal when an interference signal is detected in the input signal.

[0033] The input terminal of the detection circuit 101 can be connected to an input signal, which can be a signal transmitted by the main communication line of the electronic device.

[0034] In practical applications, the input terminal of the detection circuit 101 can be connected to the signal input terminal of an electronic device. By acquiring the input signal from the signal terminal of the electronic device and performing frequency detection on the acquired input signal, it can be determined whether there is an interference signal in the input signal. If there is an interference signal in the input signal, the center frequency of the interference signal can be determined, and the envelope information of the interference signal can be detected to determine the envelope information of the interference signal.

[0035] In the embodiments of this application, the center frequency of the interference signal refers to the main oscillation frequency of the interference signal, which may be the center frequency point of the concentrated distribution of interference spectrum energy. The envelope information of the interference signal refers to the slowly changing contour features formed by connecting the peaks of the interference signal at each moment, which is used to characterize the characteristic changes of the amplitude of the interference signal over time.

[0036] In practical applications, after the input signal is acquired, a Fast Fourier Transform (FFT) can be performed on the acquired input signal to convert the acquired input signal from a time domain signal to a frequency domain signal, thereby extracting the frequency characteristics of the input signal.

[0037] In practical applications, the effective signal (also known as the main signal) in the input signal is usually a low-frequency signal or a signal with a known frequency, while electromagnetic interference signals typically exhibit obvious spectral peaks and periodic patterns, and the amplitude of the interference signal is usually greater than 40 dBμV / m. The frequency range of electromagnetic interference signals is typically 30 MHz to 3 GHz, while the frequency of the effective signal is usually less than 20 MHz.

[0038] Therefore, the detection circuit 101 can detect whether there is a signal with a frequency of 30MHz to 3GHz in the input signal and a periodic change pattern. If so, it is determined that there is an interference signal in the input signal; otherwise, it is determined that there is no interference signal in the input signal.

[0039] Once it is determined that there is an interference signal in the input signal, the center frequency of the interference signal can be extracted from the frequency domain signal obtained by conversion.

[0040] In the embodiments of this application, the envelope information of the interference signal can be extracted by using an interference reference source.

[0041] In practical applications, interference reference sources can include, but are not limited to, clock sources of electronic devices, switching nodes of switching power supplies, etc. The detection circuit 101 can acquire a reference signal from the interference reference source, which includes the original frequency and timing information of the reference signal output by the interference reference source. By extracting the amplitude variation profile of the reference signal, it uses it as the envelope information of the interference signal.

[0042] It should be noted that the amplitude of the interference signal is usually greater than 40 dBμV / m. By using the envelope information of the interference reference source to feed back the amplitude change profile of the interference signal, it is possible to reflect the modulation of the interference signal during actual propagation and coupling.

[0043] The signal reconstruction circuit 102 is electrically connected to the detection circuit 101. The signal reconstruction circuit 102 is used to reconstruct an anti-interference signal corresponding to the interference signal based on the center frequency and envelope information of the interference signal. The anti-interference signal is obtained by using the center frequency of the interference signal as the carrier frequency and performing signal amplitude modulation based on the envelope.

[0044] In practical applications, the signal reconstruction circuit can use the center frequency detected by the detection circuit 101 as the carrier frequency of the carrier, and then perform amplitude modulation on the carrier based on the detection, thereby reconstructing an anti-interference signal in the digital signal processor or analog circuit that is highly similar to the waveform of the real interference signal.

[0045] In some embodiments of this application, several anti-interference reference signals corresponding to different frequency bands can be preset. That is, for different frequency bands, multiple anti-interference reference signals are preset based on the predicted amplitude change profile. In this way, after determining the center frequency and envelope information of the interference signal, the anti-interference reference signal corresponding to the center frequency and envelope information of the interference signal can be matched from the preset anti-interference reference signals and used as the anti-interference signal, thereby improving efficiency.

[0046] In practical applications, the envelope information prediction model is trained using relevant data from historical interference signals to predict the amplitude change contour envelope information of typical interference signals in each frequency band; and corresponding anti-interference reference signals (including the corresponding carrier and the signal adjusted by the predicted envelope information) are pre-generated and stored for each frequency band.

[0047] In practical applications, after the detection circuit 101 detects the current frequency band of the interference signal, the pre-stored anti-interference reference signal can be retrieved and compared with the detected envelope information to match the optimal anti-interference signal.

[0048] It should be noted that each frequency band can be pre-bound with a set of typical carrier frequencies within that frequency band as a reference signal carrier base. Since the characteristics of interference carriers and the variation patterns of envelope information within the same frequency band are highly similar, the corresponding envelope information can be predicted, thereby constructing anti-interference reference signals for different frequency bands.

[0049] In practical applications, for each frequency band, multiple sets of anti-interference reference signals corresponding to typical predicted envelope information can be pre-stored. Then, based on the envelope information detected by the detection circuit 101, a matching is performed to determine the anti-interference reference signal that is closest to the envelope information of the interference signal, which is then used as the anti-interference signal.

[0050] This can effectively reduce the real-time computational load of the anti-electromagnetic interference system, thereby improving the anti-interference response speed.

[0051] The superposition circuit 103 is electrically connected to the signal reconstruction circuit 102 and is used to superimpose the anti-interference signal with the input signal after inverting the signal.

[0052] In practical applications, the obtained anti-interference signal is inverted. Since the anti-interference signal after inversion has the same frequency and opposite phase amplitude as the interference signal, it can cancel out the interference signal in the input signal, thereby effectively achieving anti-interference.

[0053] In practical applications, due to differences in signal processing and transmission paths, there will be delays between the main signal path and the reverse signal path (i.e., the link from which the anti-interference signal, after phase inversion, is input into the main signal of the entire system). Therefore, when superimposing the anti-interference signal after phase inversion with the input signal, it is necessary to delay the anti-interference signal or the input signal so that the interference signal in the input signal and the introduced anti-interference signal have the same time reference (i.e., opposite phases) when they reach the superposition point.

[0054] In practical applications, by superimposing the delayed input signal and the inverted anti-interference signal through an adder or operational amplifier, the interference signal in the input signal can be actively canceled out, thus supporting anti-electromagnetic interference in complex and dynamic interference environments.

[0055] As can be seen from the above, the anti-electromagnetic interference system provided in this application detects the center frequency and envelope information of the interference signal through a detection circuit, and reconstructs an anti-interference signal with the same frequency and similar envelope information as the interference signal. After phase inversion processing, the anti-interference signal is superimposed on the input signal. Since the anti-interference signal after phase inversion processing has the opposite phase to the interference signal, it can effectively cancel the interference in the input signal, realize automatic tracking of dynamically changing interference, and actively cancel it, thereby supporting anti-electromagnetic interference in complex and dynamic interference environments.

[0056] Please see Figure 2 , Figure 2 This paper shows a schematic diagram of the detection circuit 101 in the electromagnetic interference suppression system 10 provided in an embodiment of this application. Figure 2 As shown, the detection circuit 101 includes a first detection unit 1011 and a second detection unit 1012.

[0057] In practical applications, the first detection unit 1011 is used to extract the frequency information of the input signal, identify the interference signal based on the frequency information of the input signal, and determine the center frequency of the interference signal when there is an interference signal in the input signal.

[0058] In specific applications, the first detection unit 1011 mentioned above includes a frequency meter.

[0059] The frequency information of the input signal is detected by a frequency meter, and the center frequency of the interference signal is determined when there is interference in the input signal.

[0060] In practical applications, the selection of a frequency meter can be determined according to the actual application requirements. The scanning speed and accuracy of the frequency meter determine the response capability of the anti-electromagnetic interference system to dynamically changing interference.

[0061] The second detection unit 1012 is connected to the interference reference source and is used to extract the envelope information of the reference signal output by the interference reference source, and use the envelope information of the reference signal as the envelope information of the interference signal.

[0062] In practical applications, the aforementioned interference reference sources may include, but are not limited to, clock sources of electronic devices, switching nodes of switching power supplies, etc.

[0063] In specific applications, the second detection unit 1012 may include a diode envelope detection circuit, which may include discrete components such as diodes, resistors, and capacitors.

[0064] For example, such as Figure 3 As shown, Figure 3 A circuit diagram of a diode envelope detection circuit is shown, as follows: Figure 3 As shown, the diode envelope detection circuit may include a first diode D1, a first resistor R1, a second resistor R2, and a first capacitor C1.

[0065] The first terminal (anode) of the first diode D1 is the input terminal of the second detection unit 1012. The second terminal of the first diode D1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the first terminal of the second resistor R2. The second resistor R2 and the first capacitor C1 are connected in parallel. The second terminal of the second resistor R2 is grounded. The first terminal of the first capacitor C1 is the output terminal of the diode envelope detection circuit.

[0066] Figure 3 The working principle of the diode envelope detection circuit shown is as follows: In a diode envelope detector circuit, the first diode D1 is the detector element, and the first capacitor C1 and the second resistor R2 form a low-pass filter. When the amplitude of the input signal is large, the first diode D1 operates intermittently. When the input signal is in the positive half-cycle, the first diode D1 conducts, charging the first capacitor C1; during the negative half-cycle and when the input voltage is small, the first diode D1 is cut off, discharging the first capacitor C1 and the second resistor R2. The voltage across the second resistor R2 contains many frequency components. After the first capacitor C1 filters out the high-frequency components, the restored signal amplitude variation can be obtained at the output.

[0067] The envelope information of interference signals can be effectively detected using a simple diode envelope detection circuit, which can reduce implementation costs.

[0068] In some embodiments, the second detection unit 1012 may also employ other schemes capable of envelope detection, such as, but not limited to, using an envelope detection circuit with an operational amplifier and a diode, using a high-speed ADC to continuously acquire waveforms to extract envelope information, and using a dedicated envelope detection chip, etc.

[0069] In some embodiments, please refer to Figure 4 , Figure 4 A schematic diagram of the superimposed circuit 103 in the electromagnetic interference suppression system 10 provided in this application embodiment is shown. Figure 4 As shown, the superposition circuit 103 may include a phase inversion unit 1031, a delay unit 1032, and a superposition unit 1033.

[0070] The phase inversion unit 1031 is used to invert the anti-interference signal.

[0071] In specific applications, the phase inversion unit 1031 may include an inverse proportional operational amplifier.

[0072] In some embodiments, the phase inversion unit 1031 may also include, but is not limited to, a differential amplifier circuit, an LC phase shift network circuit, a programmable logic internal inversion operation circuit, etc.

[0073] The aforementioned delay unit 1032 can perform delay processing on the input signal.

[0074] The input signal after delay processing is synchronized in the time domain with the anti-interference signal after phase inversion processing.

[0075] The aforementioned delay unit 1032 may include an RC delay circuit, which can achieve delay through a simple circuit.

[0076] In some implementations, the aforementioned delay unit 1032 includes an adjustable delay circuit. In specific applications, the adjustable delay circuit includes an adjustable resistor RT1 and a second capacitor C2. The charging time of the RC circuit is controlled by adjusting the resistance value of the adjustable resistor RT1, thereby adjusting the delay time.

[0077] The superposition unit 1033 is connected to the phase reversal unit 1031 and the delay unit 1032 respectively, and is used to superimpose the input signal after delay processing and the anti-interference signal after phase inversion processing.

[0078] In specific applications, the superposition unit 1033 may include an adder.

[0079] The first input terminal of the adder receives the input signal after delay processing, the second input terminal of the adder receives the anti-interference signal after inversion processing, and the output terminal of the adder outputs the superimposed signal (i.e., the main signal that has eliminated the interference signal).

[0080] In specific applications, the superposition unit 1033 may include an operational amplifier adder circuit, which superimposes the delayed input signal and the inverted anti-interference signal.

[0081] It should be noted that the op-amp adder circuit is a basic circuit used in analog electronic design to add multiple voltage signals together in a specific ratio. For specific circuit implementation, please refer to existing op-amp adder circuits, which will not be elaborated here.

[0082] In some embodiments, please refer to Figure 5 , Figure 5 A schematic diagram of the circuit structure of the electromagnetic interference suppression system 10 provided in an embodiment of this application is shown, as follows: Figure 5 As shown, the first detection unit 1011 includes a frequency meter U1, and the second detection unit 1012 includes a diode envelope detection circuit (corresponding to...). Figure 3 The circuit shown includes an analog signal reconstructor U2, a phase inversion unit including an inverse proportional operational amplifier U3, a delay unit including an adjustable RC delay circuit, and a superposition unit including an adder U4.

[0083] Combination Figure 5 The working principle of the electromagnetic interference suppression system 10 provided in this application embodiment is explained as follows: During operation, the anti-electromagnetic interference system 10 can acquire the frequency information of the input signal through the frequency meter U1 and detect whether there is an interference signal. If there is an interference signal, the center frequency of the interference signal is extracted, the envelope information of the reference signal is detected by the diode envelope detection circuit, the corresponding carrier is determined by the analog signal reconstructor U2 based on the center frequency, and the amplitude of the carrier is adjusted by the envelope information to obtain the anti-interference signal. The anti-interference signal is output to the inverse proportional operational amplifier U3 for inversion processing, the input signal is delayed by the adjustable RC delay circuit, and finally the inverted anti-interference signal and the delayed input signal are superimposed by the adder U4. Since the phase of the anti-interference signal is opposite to the phase of the interference signal, it can actively cancel the interference signal in the input signal.

[0084] This application also provides an electronic device, which may include the electromagnetic interference suppression system in any of the above embodiments.

[0085] It should be noted that the terms "coupling," "attachment," and "connection" are used herein to refer to a direct or indirect connection between two objects. For example, when describing a first object coupled to a second object, the first object is considered to be coupled to the second object even if it is not in direct physical contact with the second object, but is indirectly in contact with the second object through a conductor and / or other objects. The term "circuit" is widely used and intended to include hardware implementations of both electronic components and conductors that, when connected and configured, enable the performance of the functions described in this application, without being limited to the type of electronic circuit.

[0086] It should also be noted that the term "determine" can encompass a wide variety of actions. For example, "determine" can include calculation, operation, processing, deduction, investigation, lookup (e.g., searching in a table, database, or other data structure), assertion, etc. Furthermore, "determine" can include receiving (e.g., receiving information), accessing (e.g., accessing data in memory), etc. Additionally, "determine" can include parsing, selecting, picking, building, etc.

[0087] When describing systems, apparatus, and methods, the accompanying drawings and / or descriptions use terms such as block, module, component, unit, step, process, and algorithm. For example, the functions corresponding to these terms can be implemented using hardware.

[0088] The various operations or methods described above can be performed by any suitable component capable of performing the corresponding function. This component may include various hardware and / or software components and / or modules, including but not limited to circuits, application-specific integrated circuits (ASICs), or processors.

[0089] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the terminal device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0090] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, refer to the relevant descriptions of other embodiments.

[0091] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0092] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

[0093] In the description of this application, it should be understood that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “and / or” and “and / or” as used herein describe the relationship between related objects, indicating that three relationships may exist, for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship. The singular forms “a” and “an” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof, i.e., including any and all combinations of one or more of the associated listed items. Ordinal numbers such as “first” and “second” referenced in the embodiments of this application are merely identifiers and do not imply any particular order or relative importance.

[0094] In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" a second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The phrase "one or more embodiments" as used herein does not refer to the same embodiment, but rather to any suitable combination of specific features, structures, or characteristics. The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An electromagnetic interference suppression system, characterized in that, include: A detection circuit is used to determine the center frequency and envelope information of an interference signal when an interference signal is detected in an input signal. A signal reconstruction circuit, electrically connected to the detection circuit, is used to reconstruct an anti-interference signal corresponding to the interference signal based on the center frequency of the interference signal and the envelope information of the interference signal. The anti-interference signal is obtained by using the center frequency of the interference signal as the carrier frequency and performing signal amplitude modulation based on the envelope information. The superposition circuit, electrically connected to the signal reconstruction circuit, is used to invert the anti-interference signal and then superimpose it with the input signal.

2. The electromagnetic interference suppression system according to claim 1, characterized in that, The detection circuit includes: The first detection unit is used to extract the frequency information of the input signal, identify interference signals based on the frequency information of the input signal, and determine the center frequency of the interference signal when the interference signal exists in the input signal. The second detection unit is connected to the interference reference source and is used to extract the envelope information of the reference signal output by the interference reference source, and use the envelope information of the reference signal as the envelope information of the interference signal.

3. The anti-electromagnetic interference system according to claim 2, characterized in that, The first detection unit includes a frequency meter; The frequency meter is connected in the transmission path of the input signal to collect the input signal and perform time-frequency domain conversion on the input signal to extract the frequency information of the input signal. It also identifies interference signals based on the frequency information of the input signal and outputs the center frequency of the interference signal when interference signals are present in the input signal.

4. The anti-electromagnetic interference system according to claim 2, characterized in that, The second detection unit includes a first diode, a first resistor, a second resistor, and a first capacitor; The first terminal of the first diode is the input terminal of the second detection unit. The second terminal of the first diode is connected to the first terminal of the first resistor. The second terminal of the first resistor is connected to the first terminal of the second resistor. The second resistor and the first capacitor are connected in parallel. The second terminal of the second resistor is grounded. The first terminal of the first capacitor is the output terminal of the second detection unit.

5. The electromagnetic interference suppression system according to claim 1, characterized in that, The superposition circuit includes: A phase inversion unit is used to invert the anti-interference signal. A delay unit is connected in the transmission path of the input signal and is used to delay the input signal. The delayed input signal is time-domain synchronized with the anti-interference signal after phase inversion. The superposition unit is connected to the phase reversal unit and the delay unit respectively, and is used to superimpose the delayed input signal and the inverted anti-interference signal.

6. The electromagnetic interference suppression system according to claim 5, characterized in that, The phase inversion unit includes an inverse proportional operational amplifier.

7. The electromagnetic interference suppression system according to claim 5, characterized in that, The delay unit includes an adjustable delay circuit.

8. The electromagnetic interference suppression system according to claim 5, characterized in that, The superposition unit includes an adder; The first input terminal of the adder receives the input signal after delay processing, the second input terminal of the adder receives the anti-interference signal after phase inversion processing, and the output terminal of the adder outputs the superimposed signal.

9. The electromagnetic interference suppression system according to any one of claims 1 to 7, characterized in that, Signal reconstruction circuits include analog signal reconstructors.

10. An electronic device, characterized in that, Including the electromagnetic interference suppression system as described in any one of claims 1 to 9.

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