Dynamic filtering control circuit
By designing a dynamic filtering control circuit, and using the cooperation of the frequency component module and the control module to dynamically select the appropriate filtering circuit, the problem of being unable to handle multiple interfering signals in different frequencies at the same time in the prior art is solved, and higher filtering flexibility and applicability are achieved.
Patent Information
- Application Number
- CN202421559742.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-03
AI Technical Summary
Existing filter circuits cannot process external signals containing multiple interfering signals in different frequencies at the same time, resulting in insufficient flexibility in the filtering process.
A dynamic filtering control circuit is designed, including a signal acquisition module, a frequency component module, a control module, a dynamic selection module and a filtering module. The frequency component module analyzes the frequency of the interference signal in the external signal, the control module generates a control signal, and the dynamic selection module selects an appropriate filtering circuit based on the control signal, so as to achieve filtering of multiple interference signals of different frequencies.
The filtering process of a variety of external signals containing interfering signals of different frequencies is realized, which improves the flexibility and applicability of the filtering process and is suitable for a variety of filtering needs.
Smart Images
Figure CN222954004U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of dynamic control technology, and in particular to a dynamic filtering control circuit. Background Art
[0002] In wireless communication technology, the signal processing process usually requires filtering out interference signals in the signal. However, current filtering circuits can usually only filter the same type of signals and cannot simultaneously process external signals containing multiple interference signals of different frequencies. Therefore, a dynamic filtering solution is urgently needed to solve the above problem. Utility Model Content
[0003] The disclosed embodiment provides a dynamic filtering control circuit to solve the problem that the existing filtering circuit cannot simultaneously process external signals containing multiple interference signals of different frequencies, thereby improving the flexibility of the filtering process.
[0004] The present disclosure provides a dynamic filtering control circuit, including:
[0005] Signal acquisition module, frequency component module, control module, dynamic selection module and filtering module;
[0006] The signal acquisition module is connected to the frequency component module; the frequency component module is configured to determine the frequency of the interference signal contained in the external signal;
[0007] The frequency component module is connected to the control module; the signal acquisition module and the control module are both connected to the dynamic selection module; the dynamic selection module is connected to the filtering module;
[0008] The filtering module includes a plurality of filtering circuits; the dynamic selection module is configured to select a corresponding filtering circuit according to a control signal sent by the control module; and the plurality of filtering circuits are configured to filter interference signals contained in external signals.
[0009] In an exemplary embodiment of the present disclosure, the filtering module includes:
[0010] a first filtering circuit and a second filtering circuit;
[0011] The first filter circuit includes: a low-pass filter circuit and a high-pass filter circuit;
[0012] The first filtering circuit is configured to perform low-pass filtering, high-pass filtering or band-pass filtering on the interference signal contained in the external signal according to the selection signal of the dynamic selection module;
[0013] The second filtering circuit is configured to perform band-stop filtering on an interference signal contained in the external signal.
[0014] In an exemplary embodiment of the present disclosure, the first filtering circuit further includes:
[0015] A first switch K1 and a second switch K2;
[0016] The first switch K1 is connected in parallel with the low-pass filter circuit; the second switch K2 is connected in parallel with the high-pass filter circuit;
[0017] The first switch K1 and the second switch K2 are both connected to the control module; the control module is configured to control the working states of the first switch K1 and the second switch K2 according to the frequency of the interference signal contained in the external signal.
[0018] In an exemplary embodiment of the present disclosure, the low-pass filter circuit includes:
[0019] Comparator U1, capacitor C1, capacitor C2, resistor R1, resistor R2;
[0020] The first end of the resistor R1 is connected to the dynamic selection module; the second end of the resistor R1 is connected to the first end of the capacitor C2 and the first end of the resistor R2 respectively; the second end of the resistor R2 and the first end of the capacitor C1 are both connected to the inverting input end of the comparator U1; the second end of the capacitor C1 is grounded; the second end of the capacitor C2 and the non-inverting input end of the comparator U1 are both connected to the output end of the comparator U1.
[0021] In an exemplary embodiment of the present disclosure, the high-pass filter circuit includes:
[0022] Capacitor C3, capacitor C4, capacitor C5, comparator U2, resistor R3, resistor R4, resistor R5, diode D1, diode D2;
[0023] The first end of the capacitor C3 is connected to the low-pass filter circuit; the second end of the capacitor C3 is connected to the first end of the capacitor C4 and the first end of the resistor R3 respectively; the second end of the capacitor C4 and the first end of the resistor R4 are both connected to the inverting input end of the comparator U2; the second end of the resistor R4 is grounded; the second end of the resistor R3 and the non-inverting input end of the comparator U2 are both connected to the output end of the comparator U2;
[0024] The output end of the comparator U2 is connected to the first end of the resistor R5; the second end of the resistor R5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively; the cathode of the diode D1 is connected to the external output end; the first end of the capacitor C5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively; the second end of the capacitor C5 and the anode of the diode D2 are grounded.
[0025] In an exemplary embodiment of the present disclosure, the second filtering circuit includes:
[0026] Resistor R11, resistor R12, resistor R13, capacitor C6, capacitor C7, capacitor C8, comparator U5;
[0027] The first end of the resistor R11 and the first end of the capacitor C6 are both connected to the dynamic selection module; the second end of the resistor R11 is respectively connected to the first end of the capacitor C8 and the first end of the resistor R12; the second end of the capacitor C8 is grounded; the second end of the capacitor C6 is respectively connected to the first end of the capacitor C7 and the first end of the resistor R13; the second end of the capacitor C7 and the second end of the resistor R12 are both connected to the inverting input end of the comparator U5;
[0028] The second end of the resistor R13 and the non-inverting input end of the comparator U5 are both connected to the output end of the comparator U5; and the output end of the comparator U5 is connected to the external output end.
[0029] In an exemplary embodiment of the present disclosure, a dynamic filtering control circuit further includes:
[0030] Signal processing circuit;
[0031] The plurality of filter circuits are all connected to the signal processing circuit; the signal processing circuit is configured to amplify the filtered external signal.
[0032] In an exemplary embodiment of the present disclosure, the signal processing circuit includes:
[0033] Resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, comparator U3, comparator U4;
[0034] The first end of the resistor R6 is connected to the plurality of filter circuits; the second end of the resistor R6 is connected to the non-inverting input end of the comparator U3; the inverting input end of the comparator U3 and the output end of the comparator U3 are both connected to the first end of the resistor R7; the second end of the resistor R7 is connected to the inverting input end of the comparator U4;
[0035] The first end of the resistor R8 is grounded; the second end of the resistor R8 and the first end of the resistor R9 are both connected to the in-phase input terminal of the comparator U4; the second end of the resistor R9 and the output terminal of the comparator U4 are both connected to the resistor R10; the second end of the resistor R10 is connected to the external output terminal.
[0036] The beneficial effects of a dynamic filtering control circuit provided by the embodiment of the present disclosure are:
[0037] This embodiment can perform frequency analysis on the input external signal to determine the frequency range of the interference signal contained therein, and select the corresponding filtering circuit according to the frequency of different interference signals to achieve simultaneous filtering of multiple external signals containing interference signals of different frequencies. It is suitable for various filtering needs and improves the control flexibility of the filtering circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0039] Figure 1 is a structural schematic diagram of a dynamic filtering control circuit provided by an embodiment of the present disclosure;
[0040] Figure 2 is a structural schematic diagram of a dynamic filtering control circuit provided by another embodiment of the present disclosure;
[0041] Figure 3 is a schematic diagram of a first filtering circuit provided by an embodiment of the present disclosure;
[0042] Figure 4 is a schematic diagram of a second filtering circuit provided by an embodiment of the present disclosure;
[0043] Figure 5 It is a schematic diagram of a signal processing circuit provided by an embodiment of the present disclosure. DETAILED DESCRIPTION
[0044] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.
[0045] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.
[0046] The following is a detailed description of the implementation of the present disclosure in conjunction with the specific drawings:
[0047] Figure 1 This is a schematic diagram of a dynamic filtering control circuit provided by an embodiment of the present disclosure. Figure 1 , the dynamic filtering control circuit 10 comprises:
[0048] A signal acquisition module 11 , a frequency component module 12 , a control module 13 , a dynamic selection module 14 and a filtering module 15 .
[0049] The signal acquisition module 11 is connected to the frequency component module 12. The frequency component module 12 is configured to determine the frequency of the interference signal contained in the external signal.
[0050] The frequency component module 12 is connected to the control module 13. The signal acquisition module 11 and the control module 13 are both connected to the dynamic selection module 14. The dynamic selection module 14 is connected to the filtering module 15.
[0051] The filter module 15 includes a plurality of filter circuits. The dynamic selection module 14 is configured to select a corresponding filter circuit according to a control signal sent by the control module 13. The plurality of filter circuits are configured to filter interference signals contained in the external signal.
[0052] In this embodiment, the signal acquisition module 11 is the first step of the entire control circuit, responsible for receiving and preliminarily processing external signals to ensure that the external signals can be correctly identified and analyzed by subsequent modules. This process usually involves preliminary processing steps such as signal amplification, shaping and conversion.
[0053] The frequency component module 12 is directly connected to the signal acquisition module 11. The frequency component module 12 can be a spectrum analyzer, which can identify the specific frequency components of the interference signal contained in the external signal through spectrum analysis and other technologies. This is the basis for the entire system to dynamically adjust the filtering strategy and lay the foundation for subsequent accurate filtering.
[0054] The control module 13 can generate a specific control signal to select a filtering circuit for the interference signal based on the interference signal frequency information analyzed by the frequency component module 12. The control module 13 is the core module of the intelligent adjustment of the entire control circuit. It can determine the filtering strategy to be adopted based on the analysis results to ensure the adaptability and flexibility of the entire control circuit. For example, if the frequency component module 12 determines that the interference signal contained in the current external signal is a high-frequency signal, the control module 13 can send a first control signal to filter the high-frequency signal, and the filtering module 15 selects a suitable filtering circuit according to the first control signal to filter the high-frequency interference signal.
[0055] The dynamic selection module 14 is used to receive the external signal transmitted by the signal acquisition module 11 and the control signal sent by the control module 13, and select the filter circuit that best suits the current interference frequency according to the control signal. This design enables the entire control circuit to respond quickly to different types of interference signals and switch to the most effective filtering method. For example, if the dynamic selection module 14 receives a first control signal, the first control signal is to filter out high-frequency interference signals. At this time, the dynamic selection module 14 controls the selection of the corresponding filter circuit to filter the external signal.
[0056] The filter module 15 may include a plurality of preset filter circuits, for example, a low-pass filter circuit, a high-pass filter circuit, a band-pass filter circuit, etc. Each filter circuit may have different filtering effects for signals in a specific frequency range. The dynamic selection module 14 may select one or more filter circuits to work according to the control signal sent by the control module 13, and accurately filter out the interference signal while retaining the integrity of the useful signal as much as possible.
[0057] For example, if the first control signal is to filter out a high-frequency interference signal, the dynamic selection module 14 may select a corresponding low-pass filter circuit according to the first control signal.
[0058] For example, if the second control signal is to filter out a low-frequency interference signal, the dynamic selection module 14 may select a corresponding high-pass filter circuit according to the second control signal.
[0059] It can be concluded from the above that the present embodiment can effectively suppress interference components in external signals through real-time analysis of external signals, intelligent decision-making and flexible selection of filtering strategies, thereby ensuring the high quality and stability of the output signal and improving the flexibility and applicability of signal processing.
[0060] Figure 2 is a structural diagram of a dynamic filtering control circuit provided by another embodiment of the present disclosure, referring to Figure 2 In one embodiment of the present disclosure, the filtering module 15 includes:
[0061] The first filter circuit 151 and the second filter circuit 152 .
[0062] The first filter circuit 151 includes a low-pass filter circuit and a high-pass filter circuit.
[0063] The first filtering circuit 151 is configured to perform low-pass filtering, high-pass filtering or band-pass filtering on the interference signal contained in the external signal according to the selection signal of the dynamic selection module 14 .
[0064] The second filter circuit 152 is configured to perform band-stop filtering on the interference signal included in the external signal.
[0065] In this embodiment, in order to filter interference signals of different frequencies, different filter circuits can be set to process interference signals of different frequencies, so the filter module can be specifically divided into two main parts: a first filter circuit and a second filter circuit. Among them, the first filter circuit can perform low-pass filtering, high-pass filtering or a combination of the two to achieve band-pass filtering according to the selection signal sent by the dynamic selection module. The first filter circuit can include a low-pass filter circuit and a high-pass filter circuit. This design allows basic screening of the frequency components of the interference signal in the external signal, and the low-pass filter is used to allow low-frequency signals to pass and filter out high-frequency signals. High-pass filtering is the opposite, and is used to allow high-frequency signals to pass and filter out low-frequency signals. Band-pass filtering refers to allowing only signals in a certain frequency range (frequency band) to pass, while suppressing low-frequency signals below this range and high-frequency signals above this range, which is very effective for accurately removing interference in a specific frequency band.
[0066] The second filter circuit is specially designed to perform band-stop filtering, which blocks signals in a specific frequency band while leaving the remaining frequency signals unchanged. This is critical for accurately eliminating known interfering frequency bands, such as specific noise or unwanted signal frequency bands.
[0067] It can be concluded from the above that this embodiment can flexibly deal with a variety of interference signals, whether it is necessary to allow specific frequency band signals to pass or directly exclude unwanted frequency bands, it can complete the task efficiently and accurately. Through the intelligent regulation of the dynamic selection module, the system can adapt to signal changes in real time and automatically select the most appropriate filtering strategy to ensure the quality and purity of the output signal.
[0068] Figure 3 is a schematic diagram of a first filtering circuit provided by an embodiment of the present disclosure, referring to Figure 3 In one embodiment of the present disclosure, the first filtering circuit 151 further includes:
[0069] The first switch K1 and the second switch K2.
[0070] The first switch K1 is connected in parallel with the low-pass filter circuit. The second switch K2 is connected in parallel with the high-pass filter circuit.
[0071] The first switch K1 and the second switch K2 are both connected to the control module 13. The control module 13 is configured to control the working states of the first switch K1 and the second switch K2 according to the frequency of the interference signal contained in the external signal.
[0072] In this embodiment, the first filter circuit 151 can achieve more flexible filtering mode selection by adding the first switch K1 and the second switch K2. The specific working principle is as follows:
[0073] The first switch K1 is connected in parallel with the low-pass filter circuit, and the second switch K2 is connected in parallel with the high-pass filter circuit, which means that when the first switch K1 is closed and the second switch K2 is disconnected, the low-pass filter circuit is short-circuited, and the first filter circuit 151 can only implement a high-pass filter process for the external signal. When the first switch K1 is disconnected and the second switch K2 is closed, the high-pass filter circuit is short-circuited, and the first filter circuit 151 can only implement a low-pass filter process for the external signal. When the first switch K1 is disconnected and the second switch K2 is disconnected, the low-pass filter circuit and the high-pass filter circuit are both in a connected state, and the first filter circuit 151 can implement a band-pass filter process for the external signal.
[0074] The state of switch K1 or the working state of switch K2 is determined by the control module 13 according to the analysis result of the interference frequency in the external signal. The control module 13 can selectively control the opening and closing of K1 and K2 based on the identification of the interference characteristics in the external signal, thereby controlling the first filter circuit 151 to achieve different filtering functions.
[0075] For example, if an external signal is analyzed and the analysis result shows that a high-frequency interference signal needs to be filtered out, the low-pass filter function needs to be enabled, and the control module will send a first control instruction to disconnect K1 and close K2.
[0076] For example, if an external signal is analyzed and the analysis result shows that a low-frequency interference signal needs to be filtered out, the high-pass filter function needs to be enabled, and the control module will send a first control instruction to close K1 and open K2.
[0077] For example, if an external signal is analyzed and the analysis result shows that the signal within a specific frequency range needs to be retained, the bandpass filtering function needs to be enabled, and the control module will send a first control instruction to disconnect K1 and K2.
[0078] This design allows the system to quickly switch filtering modes according to actual needs. It can enable low-pass or high-pass filtering separately, or it can control the coordination of the two switches to achieve precise control of specific frequency bandwidth.
[0079] From the above, it can be concluded that this embodiment can deal with different types of interference signals in a more flexible way, improve the adaptability and filtering efficiency of the entire control circuit, and enable the entire dynamic filtering control circuit to efficiently purify the signal to meet the needs of different application scenarios.
[0080] Reference Figure 3 In one embodiment of the present disclosure, the low-pass filter circuit includes:
[0081] Comparator U1, capacitor C1, capacitor C2, resistor R1, resistor R2.
[0082] The first end of the resistor R1 is connected to the dynamic selection module 14. The second end of the resistor R1 is connected to the first end of the capacitor C2 and the first end of the resistor R2 respectively. The second end of the resistor R2 and the first end of the capacitor C1 are both connected to the inverting input terminal of the comparator U1. The second end of the capacitor C1 is grounded. The second end of the capacitor C2 and the non-inverting input terminal of the comparator U1 are both connected to the output terminal of the comparator U1.
[0083] In this embodiment, the comparator U1 is used as the core element of the low-pass filter circuit to compare the voltage of the input signal and generate an output signal according to the comparison result to control the passage or interception of the external signal. Here, it works together with the capacitors C1, C2 and the resistors R1, R2 to form a low-pass filter circuit.
[0084] In the low-pass filter circuit, the function of the capacitor is to allow the high-frequency components in the AC signal to attenuate, while having little effect on the transmission of the low-frequency components, thereby achieving a low-pass filter effect. C1 is connected to the input signal path, and C2 is connected to the feedback path, and together they participate in forming the frequency response characteristics of the filter.
[0085] One end of resistor R1 is connected to dynamic selection module 14 for receiving external signals, and the other end is connected in series with capacitor C2 and resistor R2 to control the input impedance and feedback path of the filter circuit. R2 is connected to the input end of comparator U1, affecting the operating point of the comparator and the cut-off frequency of the filter. The setting of resistor R1 enables the external control signal to affect the characteristics of the filter circuit, realizing the possibility of dynamic adjustment. Capacitor C2 is connected to the in-phase input and output of comparator U1, forming a positive feedback loop, which helps to stabilize the working state of the comparator. Capacitor C1 is connected to the ground, and together with resistor R2, determines the low-pass cut-off frequency of the filter circuit, that is, the signal higher than this frequency will be gradually attenuated.
[0086] It can be concluded from the above that the present embodiment can dynamically adjust its filtering characteristics according to the instructions of the control module, effectively filter out high-frequency interference in the signal, and retain low-frequency signals, which is very critical for removing unnecessary high-frequency noise in complex signal processing. The present embodiment not only improves the adaptability and flexibility of the system, but also ensures the accuracy and efficiency of signal filtering.
[0087] Reference Figure 3 In one embodiment of the present disclosure, the high-pass filter circuit includes:
[0088] Capacitor C3, capacitor C4, capacitor C5, comparator U2, resistor R3, resistor R4, resistor R5, diode D1, diode D2.
[0089] The first end of capacitor C3 is connected to the low pass filter circuit. The second end of capacitor C3 is connected to the first end of capacitor C4 and the first end of resistor R3 respectively. The second end of capacitor C4 and the first end of resistor R4 are both connected to the inverting input of comparator U2. The second end of resistor R4 is grounded. The second end of resistor R3 and the non-inverting input of comparator U2 are both connected to the output of comparator U2.
[0090] The output end of the comparator U2 is connected to the first end of the resistor R5. The second end of the resistor R5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively. The cathode of the diode D1 is connected to the external output end. The first end of the capacitor C5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively. The second end of the capacitor C5 and the anode of the diode D2 are grounded.
[0091] In this embodiment, capacitor C3 is connected to the low-pass filter circuit as an input buffer and a path for high-frequency signals. Capacitor C4 is connected to the inverting input terminal of comparator U2, and together with resistor R4 forms a transmission path for high-frequency signals. Capacitor C5 is connected to diodes D1 and D2 for smoothing the output of high-frequency signals and reducing ripples. Comparator U2 is similar to comparator U1 in the low-pass filter circuit. Comparator U2 is used to compare the input signal with the reference voltage, and its output signal is used to control whether the signal passes or not, but here it is used as a key component of high-pass filtering to participate in the formation of high-pass characteristics. Resistors R3, R4, and R5 form an RC network together with capacitors, wherein R3 forms a filtering path with C3 and C4, and R4 forms the input impedance of the comparator with C4, affecting the cut-off frequency; R5 is connected to diodes D1 and D2 for current limiting and signal transmission. The role of diodes D1 and D2 is to provide unidirectional conductivity to ensure the correct flow of signals. D1 allows the signal to flow from comparator U2 to the external output, while D2 acts as a protection to prevent the current from flowing in the opposite direction.
[0092] The overall working principle is: the external signal first enters the high-pass filter circuit through capacitor C3. Capacitors C3 and C4, resistors R3 and R4 together form a high-pass filter circuit, allowing high-frequency signals to pass through the inverting input terminal of comparator U2, while low-frequency signals are attenuated. Comparator U2 outputs a control signal based on the comparison result between the input signal and the reference voltage. The signal is transmitted to the external output terminal through resistor R5 and diode D1. Capacitor C5 further smoothes the output signal to ensure the clear transmission of high-frequency signals. Diode D2 plays a protective role here to ensure the stability of the circuit.
[0093] It can be concluded from the above that this high-pass filter circuit design, this embodiment can flexibly process interference signals of different frequency components, effectively filter out unnecessary low-frequency interference, retain or enhance high-frequency signals, and is suitable for signal processing occasions that require precise frequency control.
[0094] Figure 4is a schematic diagram of a second filtering circuit provided by an embodiment of the present disclosure, referring to Figure 4 In one embodiment of the present disclosure, the second filtering circuit 152 includes:
[0095] Resistor R11, resistor R12, resistor R13, capacitor C6, capacitor C7, capacitor C8, comparator U5.
[0096] The first end of the resistor R11 and the first end of the capacitor C6 are both connected to the dynamic selection module 14. The second end of the resistor R11 is respectively connected to the first end of the capacitor C8 and the first end of the resistor R12. The second end of the capacitor C8 is grounded. The second end of the capacitor C6 is respectively connected to the first end of the capacitor C7 and the first end of the resistor R13. The second end of the capacitor C7 and the second end of the resistor R12 are both connected to the inverting input terminal of the comparator U5.
[0097] The second end of the resistor R13 and the non-inverting input end of the comparator U5 are both connected to the output end of the comparator U5. The output end of the comparator U5 is connected to the external output end.
[0098] In this embodiment, resistors R11, R12, and R13 together with capacitors form a key part of the second filter circuit 152. R11 is connected to the dynamic selection module 14, allowing an external control signal to adjust the filter characteristics. The combination of R12 and R13 and capacitors C7 and C8 jointly affects the cutoff frequency and quality factor of the filter. The configuration of capacitors C6, C7, and C8 is crucial to forming the band-stop filter characteristics. C6 and C7 are connected in series with the resistors in the feedback path, affecting the frequency selectivity of the entire circuit; C8 is connected to the input signal path and works together with R11 to perform preliminary processing on the input signal. The values of these capacitors determine the specific frequency band that the second filter circuit 152 wants to suppress.
[0099] As the core component of the second filtering circuit 152, the comparator U5 generates an output according to the comparison result between the external signal and the reference signal, and acts on the processing and output of the signal through its own feedback and the connection with the resistor R13 to realize the band-stop function. After passing through the resistor R11 and the capacitor C6, the external signal enters the inverting input terminal of the comparator U5 through the network formed by the capacitor C7, the resistor R12, and the capacitor C8, and the output terminal of the comparator U5 is not only connected to the in-phase input terminal to form feedback, but also directly connected to the external output, ensuring that the signal after the band-stop filtering can be directly output.
[0100] It can be concluded from the above that the present embodiment can set one or more specific frequency ranges to be suppressed, and the introduction of the dynamic selection module 14 enables the characteristics of the filter to be adjusted as needed, thereby increasing the flexibility and adaptability of the entire control circuit.
[0101] Reference Figure 2In one embodiment of the present disclosure, a dynamic filtering control circuit 10 further includes:
[0102] Signal processing circuit 16.
[0103] The plurality of filter circuits are all connected to the signal processing circuit 16. The signal processing circuit 16 is configured to amplify the filtered external signal.
[0104] In this embodiment, the signal processing circuit 16 is located after the filtering module, and is directly connected to the first filtering circuit (including low-pass filtering and high-pass filtering) and the second filtering circuit (band-stop filtering). Its main function is to perform subsequent processing on the external signal after filtering, especially amplification processing, to ensure that the signal can still maintain sufficient strength after the amplitude attenuation caused by filtering, so as to meet the requirements of subsequent use or analysis.
[0105] Signal processing circuits usually contain amplifier components, such as operational amplifiers, which can adjust the gain as needed, that is, amplify the amplitude of the signal while minimizing the introduction of additional noise or distortion. By amplifying the external signal, the power level of the signal can be restored or enhanced to meet the standards for transmission, recording or further analysis.
[0106] It can be concluded from the above that this embodiment can not only effectively filter out unnecessary frequency components in the external signal, but also actively compensate for the signal loss that may occur during the filtering process, thereby ensuring the strength and quality of the output signal.
[0107] Figure 5 is a schematic diagram of a signal processing circuit provided by an embodiment of the present disclosure, referring to Figure 5 In one embodiment of the present disclosure, the signal processing circuit 16 includes:
[0108] Resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, comparator U3, comparator U4.
[0109] The first end of the resistor R6 is connected to a plurality of filter circuits. The second end of the resistor R6 is connected to the non-inverting input of the comparator U3. The inverting input of the comparator U3 and the output of the comparator U3 are both connected to the first end of the resistor R7. The second end of the resistor R7 is connected to the inverting input of the comparator U4.
[0110] The first end of the resistor R8 is grounded. The second end of the resistor R8 and the first end of the resistor R9 are both connected to the non-inverting input end of the comparator U4. The second end of the resistor R9 and the output end of the comparator U4 are both connected to the resistor R10. The second end of the resistor R10 is connected to the external output end.
[0111] In this embodiment, resistor R6 is used as an input resistor and can be connected to multiple filter circuits to receive filtered signals and connected to the in-phase input terminal of comparator U3 to provide an input interface for signal amplification. Comparator U3 can be used as a voltage follower or participate in the construction of a part of a gain circuit, and its inverting input terminal is connected to the in-phase input terminal, and through cooperation with resistor R7, it helps to establish a stable reference voltage or participate in the preliminary processing of the signal. Resistor R7 connects the output of comparator U3 and the inverting input terminal of comparator U4, which can balance the input signal and set the gain, ensuring the stable transmission and processing of the signal.
[0112] Comparator U4 and resistors R8, R9, and R10 together form a gain stage. The non-inverting input of comparator U4 is connected to the ground through resistor R9 (grounded through R8), and its output is fed back to its own inverting input to form a closed loop. This design helps to amplify the input signal. Resistors R8, R9, and R10 can form a key feedback network around comparator U4, in which resistor R8 provides a bias point, and resistors R9 and R10 jointly determine the gain of the amplifier circuit. Resistor R10 can be directly connected to the external output terminal to output the amplified signal to the subsequent circuit or system.
[0113] It can be concluded from the above that this embodiment not only takes into account the recovery and enhancement of the external signal, but also includes signal shaping and stabilization processing to ensure the efficiency and stability of the entire control circuit signal processing link.
[0114] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.
Claims
1. A dynamic filtering control circuit, characterized in that: include: Signal acquisition module, frequency component module, control module, dynamic selection module and filtering module; The signal acquisition module is connected to the frequency component module; The frequency component module is configured to determine the frequency of the interference signal contained in the external signal; The frequency component module is connected to the control module; the signal acquisition module and the control module are both connected to the dynamic selection module; the dynamic selection module is connected to the filtering module; The filtering module includes a plurality of filtering circuits; the dynamic selection module is configured to select a corresponding filtering circuit according to a control signal sent by the control module; and the plurality of filtering circuits are configured to filter interference signals contained in external signals.
2. A dynamic filtering control circuit as claimed in claim 1, characterized in that: The filtering module comprises: a first filtering circuit and a second filtering circuit; The first filter circuit includes: a low-pass filter circuit and a high-pass filter circuit; The first filtering circuit is configured to perform low-pass filtering, high-pass filtering or band-pass filtering on the interference signal contained in the external signal according to the selection signal of the dynamic selection module; The second filtering circuit is configured to perform band-stop filtering on an interference signal contained in the external signal.
3. A dynamic filtering control circuit as claimed in claim 2, characterized in that: The first filtering circuit further includes: A first switch K1 and a second switch K2; The first switch K1 is connected in parallel with the low-pass filter circuit; the second switch K2 is connected in parallel with the high-pass filter circuit; The first switch K1 and the second switch K2 are both connected to the control module; the control module is configured to control the working states of the first switch K1 and the second switch K2 according to the frequency of the interference signal contained in the external signal.
4. A dynamic filtering control circuit as claimed in claim 2, characterized in that: The low-pass filtering circuit comprises: Comparator U1, capacitor C1, capacitor C2, resistor R1, resistor R2; The first end of the resistor R1 is connected to the dynamic selection module; the second end of the resistor R1 is connected to the first end of the capacitor C2 and the first end of the resistor R2 respectively; the second end of the resistor R2 and the first end of the capacitor C1 are both connected to the inverting input end of the comparator U1; the second end of the capacitor C1 is grounded; the second end of the capacitor C2 and the non-inverting input end of the comparator U1 are both connected to the output end of the comparator U1.
5. A dynamic filtering control circuit as claimed in claim 2, characterized in that: The high-pass filter circuit comprises: Capacitor C3, capacitor C4, capacitor C5, comparator U2, resistor R3, resistor R4, resistor R5, diode D1, diode D2; The first end of the capacitor C3 is connected to the low-pass filter circuit; the second end of the capacitor C3 is connected to the first end of the capacitor C4 and the first end of the resistor R3 respectively; the second end of the capacitor C4 and the first end of the resistor R4 are both connected to the inverting input end of the comparator U2; the second end of the resistor R4 is grounded; the second end of the resistor R3 and the non-inverting input end of the comparator U2 are both connected to the output end of the comparator U2; The output end of the comparator U2 is connected to the first end of the resistor R5; the second end of the resistor R5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively; the cathode of the diode D1 is connected to the external output end; the first end of the capacitor C5 is connected to the anode of the diode D1 and the cathode of the diode D2 respectively; the second end of the capacitor C5 and the anode of the diode D2 are grounded.
6. A dynamic filtering control circuit as claimed in claim 2, characterized in that: The second filtering circuit comprises: Resistor R11, resistor R12, resistor R13, capacitor C6, capacitor C7, capacitor C8, comparator U5; The first end of the resistor R11 and the first end of the capacitor C6 are both connected to the dynamic selection module; the second end of the resistor R11 is respectively connected to the first end of the capacitor C8 and the first end of the resistor R12; the second end of the capacitor C8 is grounded; the second end of the capacitor C6 is respectively connected to the first end of the capacitor C7 and the first end of the resistor R13; the second end of the capacitor C7 and the second end of the resistor R12 are both connected to the inverting input end of the comparator U5; The second end of the resistor R13 and the non-inverting input end of the comparator U5 are both connected to the output end of the comparator U5; and the output end of the comparator U5 is connected to the external output end.
7. A dynamic filtering control circuit as claimed in claim 1, characterized in that: Also includes: Signal processing circuit; The plurality of filter circuits are all connected to the signal processing circuit; the signal processing circuit is configured to amplify the filtered external signal.
8. A dynamic filtering control circuit as claimed in claim 7, characterized in that: The signal processing circuit comprises: Resistor R6, resistor R7, resistor R8, resistor R9, resistor R10, comparator U3, comparator U4; The first end of the resistor R6 is connected to the plurality of filter circuits; the second end of the resistor R6 is connected to the non-inverting input end of the comparator U3; the inverting input end of the comparator U3 and the output end of the comparator U3 are both connected to the first end of the resistor R7; the second end of the resistor R7 is connected to the inverting input end of the comparator U4; The first end of the resistor R8 is grounded; the second end of the resistor R8 and the first end of the resistor R9 are both connected to the in-phase input terminal of the comparator U4; the second end of the resistor R9 and the output terminal of the comparator U4 are both connected to the resistor R10; the second end of the resistor R10 is connected to the external output terminal.