Differential signal processing circuit and component-level power electronic device
By designing a differential signal processing circuit, including differential signal sampling, filtering, and signal processing modules, the problem of poor adaptability of differential signals is solved, and comprehensive evaluation and correction of signal characteristics are achieved. It is suitable for complex scenarios such as industrial control, power monitoring, and medical equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DYNESS DIGITAL ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-15
AI Technical Summary
Existing technologies for differential signals have poor adaptability and cannot meet the comprehensive detection requirements for specific signal parameters in complex application scenarios.
Design a differential signal processing circuit, including a differential signal sampling module, a filtering module, and a signal processing module. The filtering module extracts the feature signals in the differential signal, and the signal processing module corrects the DC offset in the feature signals to enhance the usability and accuracy of the signal.
It improves the adaptability and practicality of differential signals in complex environments, and can comprehensively evaluate the characteristics and trends of signals, making it suitable for fields such as industrial control, power monitoring and medical equipment.
Smart Images
Figure CN224249680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power electronics technology, and in particular to a differential signal processing circuit and a component-level power electronic device. Background Technology
[0002] With the rapid development of electronic technology, differential signals are widely used in communication, industrial control, and signal processing due to their advantages such as strong anti-interference capability and long transmission distance. To achieve accurate detection of differential signals, it is usually necessary to design dedicated sampling lines to process and analyze the signals.
[0003] Common differential signal sampling circuits often use direct sampling, which involves amplifying the signal using a differential amplifier and converting it into a single-ended signal before further processing.
[0004] However, this approach primarily monitors conventional parameters such as signal amplitude or frequency, failing to meet the comprehensive detection needs for specific signal parameters in complex application scenarios. In other words, the differential signals acquired by existing technologies suffer from poor adaptability in practical applications. Utility Model Content
[0005] This invention provides a differential signal processing circuit and a component-level power electronic device to solve the problem of poor adaptability of the acquired differential signal in use.
[0006] According to one aspect of the present invention, a differential signal processing circuit is provided, comprising: a differential signal sampling module, a filtering module, and a signal processing module;
[0007] The first input terminal of the differential signal sampling module is connected to the first terminal of the differential signal source to receive a first sampling signal; the second input terminal of the differential signal sampling module is connected to the second terminal of the differential signal source to receive a second sampling signal; the differential signal sampling module is used to output a first differential signal based on the first sampling signal and the second sampling signal output by the differential signal source.
[0008] The input terminal of the filtering module is connected to the output terminal of the differential signal sampling module, and is used to receive the first differential signal output by the differential signal sampling module and extract the feature signal contained in the first differential signal.
[0009] The first input terminal of the signal processing module is connected to the output terminal of the filtering module to receive the feature signal; the second input terminal of the signal processing module is connected to the first reference signal source, and the signal processing module is used to output an adjustment signal according to the feature signal; wherein, the adjustment signal is used to correct the DC offset in the feature signal.
[0010] Optionally, the filtering module includes: a multi-stage RC filtering unit, the input of which is connected to the output of the differential signal sampling module, for outputting a first DC signal based on the first differential signal; wherein the characteristic signal includes the first DC signal.
[0011] Optionally, the filtering module includes a Butterworth filter unit, the input of which is connected to the output of the differential signal sampling module, for outputting a first effective value signal based on the first differential signal; wherein the feature signal includes the first effective value signal.
[0012] Optionally, the filtering module includes a moving average filtering unit, the input of which is connected to the output of the differential signal sampling module, for outputting a first average signal based on the first differential signal; wherein the feature signal includes the first average signal.
[0013] Optionally, the differential signal sampling module includes: a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor;
[0014] The first end of the first resistor is connected to the first end of the differential signal source, and the second end of the first resistor is connected to the first input end of the first operational amplifier;
[0015] The second resistor is connected between the output terminal of the second reference signal source and the first input terminal of the first operational amplifier;
[0016] The first end of the third resistor is connected to the second end of the differential signal source, and the second end of the third resistor is connected to the second input end of the first operational amplifier.
[0017] The fourth resistor is connected between the ground terminal and the second input terminal of the first operational amplifier;
[0018] The output terminal of the first operational amplifier is connected to the output terminal of the filter module.
[0019] Optionally, the resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the resistance value of the fourth resistor.
[0020] Optionally, the signal processing module includes: a second operational amplifier, a fifth resistor, and a sixth resistor;
[0021] The first input terminal of the second operational amplifier is connected to the output terminal of the filter module;
[0022] The fifth resistor is connected between the output terminal of the first reference signal source and the second input terminal of the second operational amplifier.
[0023] The sixth resistor is connected between the second input terminal and the output terminal of the second operational amplifier.
[0024] Optionally, the differential signal processing circuit further includes a detection module, the input terminal of which is connected to the output terminal of the differential signal sampling module, for detecting the voltage of the first differential signal output by the differential signal sampling module.
[0025] Optionally, the differential signal processing circuit further includes a peak protection module, which is connected to the output terminal of the differential signal sampling module and is used to generate a peak protection signal based on the first differential signal output by the differential signal sampling module. The peak protection signal is used to cut off the output of the differential signal sampling module.
[0026] According to another aspect of the present invention, a component-level power electronic device is provided, comprising: the differential signal processing circuit described in any of the above embodiments.
[0027] The technical solution of this invention extracts the required characteristic signals from the first differential signal output by the differential signal sampling module through a filtering module, thereby enhancing the usability and accuracy of the differential signal and better adapting to different environments and signal conditions. Furthermore, the characteristic signals can include various information such as RMS value, average value, and DC component, which helps to comprehensively evaluate the characteristics and trends of the differential signal. In other words, this invention improves the practicality and adaptability of the differential circuit in actual use.
[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 A schematic diagram of a differential signal processing circuit provided in an embodiment of this utility model;
[0031] Figure 2 A schematic diagram of another differential signal processing circuit provided in an embodiment of this utility model;
[0032] Figure 3 This is a schematic diagram of another differential signal processing circuit provided in an embodiment of the present invention. Detailed Implementation
[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0035] Figure 1 This is a schematic diagram of a differential signal processing circuit provided in an embodiment of the present invention. This embodiment is applicable to situations where differential signals are detected and specific features are extracted. Figure 1As shown, the circuit includes a differential signal sampling module 110, a filtering module 120, and a signal processing module 130. The first input terminal of the differential signal sampling module 110 is connected to the first terminal of the differential signal source 140 to receive a first sampled signal; the second input terminal of the differential signal sampling module 110 is connected to the second terminal of the differential signal source 140 to receive a second sampled signal; the differential signal sampling module 110 is used to output a first differential signal based on the first and second sampled signals output by the differential signal source 140. The input terminal of the filtering module 120 is connected to the output terminal of the differential signal sampling module 110 to receive the first differential signal output by the differential signal sampling module 110 and extract the feature signal contained in the first differential signal. The first input terminal of the signal processing module 130 is connected to the output terminal of the filtering module 120 to receive the feature signal; the second input terminal of the signal processing module 130 is connected to the first reference signal source 150, and the signal processing module 130 is used to output an adjustment signal based on the feature signal; wherein, the adjustment signal is used to correct the DC offset in the feature signal.
[0036] Specifically, differential signal source 140 refers to a device or circuit that generates the original differential signal. For example, the original differential signal generated by differential signal source 140 may include a first sampled signal and a second sampled signal. The first sampled signal and the second sampled signal have equal amplitudes, opposite phases, and the same common-mode interference. Differential signal sampling module 110 refers to a circuit component that extracts the differential signal from the original differential signal. For example, differential signal sampling module 110 can remove common-mode interference signals from the first sampled signal and the second sampled signal, retaining the differential portion of the signal. The first differential signal refers to the differential signal generated by differential signal sampling module 110 based on the difference between the first sampled signal and the second sampled signal. The first differential signal removes the common-mode interference information present in the original differential signal, leaving effective differential information, enabling high-precision and high-reliability signal transmission and processing in complex environments.
[0037] In some embodiments, the filtering module 120 refers to a functional component used for filtering or suppressing noise in a specific frequency range of the input signal. The filtering module 120 receives the first differential signal output by the differential signal sampling module 110, removes useless frequency components such as noise or interference signals, and extracts the characteristic signals required for subsequent processing. The characteristic signal refers to the signal with specific meaning extracted by the filtering module 120 from the first differential signal. Characteristic signals are typically used to characterize the properties or state information of a signal. For example, the characteristic signal may be the signal's amplitude, frequency, phase, average value, or other important parameters reflecting the signal's quality and state.
[0038] In some embodiments, signal processing module 130 refers to a component for analyzing, calculating, and optimizing input signals. For example, signal processing module 130 receives a feature signal from filtering module 120 and a reference signal from first reference signal source 150, processes the feature signal using the reference signal, and outputs an adjustment signal to correct errors or offsets in the feature signal. The adjustment signal refers to the signal output by signal processing module 130 used to correct errors or offsets in the feature signal. In this embodiment, the main function of the adjustment signal is to eliminate DC offset in the feature signal to ensure signal accuracy and stability. DC offset refers to the amount of offset of the signal at a reference level, typically manifested as excess DC components or zero-point offset in the signal, which may lead to inaccurate signal processing results. Correcting DC offset helps restore the original characteristics of the feature signal.
[0039] In this embodiment of the invention, the differential signal sampling module 110 can receive the first sampled signal and the second sampled signal output by the differential signal source 140, and generate a first differential signal by calculating the difference between the two. The filtering module 120 can extract the desired feature signal from the first differential signal. The feature signal may include various information such as RMS value, average value, and DC component. The signal processing module 130 processes the feature signal according to the first reference voltage output by the first reference signal source 150, and outputs an adjustment signal to correct the error or offset in the feature signal.
[0040] The technical solution of this invention extracts the required characteristic signals from the first differential signal output by the differential signal sampling module through a filtering module, thereby enhancing the usability and accuracy of the differential signal and better adapting to different environments and signal conditions. Furthermore, the characteristic signals can include various information such as RMS value, average value, and DC component, which helps to comprehensively evaluate the characteristics and trends of the differential signal. In other words, this invention improves the practicality and adaptability of the differential circuit in actual use.
[0041] Figure 2 This is a schematic diagram of another differential signal processing circuit provided in an embodiment of the present invention. Based on the above embodiments, alternatively, such as... Figure 2 As shown, the filtering module 120 includes a multi-stage RC filtering unit 121, the input of which is connected to the output of the differential signal sampling module 110, for outputting a first DC signal based on the first differential signal; wherein the characteristic signal includes the first DC signal.
[0042] Specifically, the multi-stage RC filter unit 121 refers to a cascaded circuit composed of multiple resistors and capacitors. The multi-stage RC filter unit 121 achieves a steeper frequency response by connecting multiple first-order RC filters in series, suppressing high-frequency noise or interference while retaining low-frequency or DC components. The first DC signal refers to the output signal of the multi-stage RC filter unit 121.
[0043] In this embodiment of the invention, the multi-stage RC filter unit 121 gradually filters out high-frequency components in the input signal through a cascaded low-pass filter structure, and finally outputs a stable first DC signal.
[0044] Based on the above embodiments, alternatively, refer to the following: Figure 2 The filtering module 120 includes a Butterworth filter unit 122, the input of which is connected to the output of the differential signal sampling module 110, for outputting a first effective value signal based on the first differential signal; wherein the characteristic signal includes the first effective value signal.
[0045] Specifically, the Butterworth filter unit 122 refers to a circuit or digital algorithm designed based on a Butterworth filter. The core characteristic of a Butterworth filter is its maximally flat frequency response within the passband, while the signal amplitude attenuates monotonically in the stopband. Within the passband, the amplitude-frequency response curve of the Butterworth filter is undulating, ensuring minimal distortion when the signal passes through. The first RMS signal refers to a signal that includes other processed components such as the second RMS signal and harmonics. The first RMS signal can serve as a reference signal for fault diagnosis, control algorithm input, or data acquisition.
[0046] In this embodiment of the invention, the Butterworth filter in the Butterworth filter unit 122 first uses low-pass filtering to retain low-frequency components such as the fundamental frequency or DC component of the signal, filters out high-frequency noise, extracts signals in a specific frequency band, and suppresses interference from other frequencies. Then, the RMS calculator in the Butterworth filter unit 122 performs a square operation on the Butterworth-filtered signal x(t) to obtain the instantaneous power signal x. 2 (t). The effective value calculator then calculates x through sliding window averaging or integration. 2 The mean of (t) is calculated. Finally, the effective value calculator takes the square root of the mean result and outputs the first effective value signal.
[0047] Based on the above embodiments, alternatively, refer to the following: Figure 2 The filtering module 120 includes a moving average filtering unit 123, the input of which is connected to the output of the differential signal sampling module 110, for outputting a first average signal based on the first differential signal; wherein the feature signal includes the first average signal.
[0048] Specifically, the moving average filtering unit 123 refers to a circuit or unit capable of performing time-domain filtering. The moving average filtering unit 123 suppresses random noise and short-term fluctuations by calculating the arithmetic mean of the signal within a sliding time window. The first average signal refers to the output signal after moving average filtering, which is a component of the characteristic signal.
[0049] In this embodiment of the invention, the moving average filtering unit 123 achieves smooth processing of the input signal through sliding window calculation and recursive optimization, and finally outputs the first average signal.
[0050] Optionally, the filtering module 120 may also include different types of filters, such as digital filters, anti-aliasing filters, and acoustic filters. In this embodiment of the invention, the design of the filtering module 120 needs to be comprehensively selected based on signal characteristics, practical application requirements, and cost to adapt to complex application scenarios.
[0051] The technical solution of this utility model embodiment outputs a first DC signal based on a first differential signal through a multi-stage RC filter unit, a first RMS signal based on the first differential signal through a Butterworth filter unit, and a first average signal based on the first differential signal through a moving average filter unit. The first DC signal, the first RMS signal, and the first average signal can constitute a multi-dimensional characteristic signal system, meeting the complex signal processing needs of fields such as industrial control, power monitoring, and medical equipment. This utility model effectively improves the practicality and adaptability of differential signals in actual use.
[0052] Figure 3 This is a schematic diagram of another differential signal processing circuit provided in an embodiment of the present invention. Based on the above embodiments, alternatively, such as... Figure 3 As shown, the differential signal sampling module 110 includes: a first operational amplifier 111, a first resistor 112, a second resistor 113, a third resistor 114, and a fourth resistor 115; the first end of the first resistor 112 is connected to the first end of the differential signal source, and the second end of the first resistor 112 is connected to the first input end of the first operational amplifier 111; the second resistor 113 is connected between the output end of the second reference signal source 160 and the first input end of the first operational amplifier 111; the first end of the third resistor 114 is connected to the second end of the differential signal source 140, and the second end of the third resistor 114 is connected to the second input end of the first operational amplifier 111; the fourth resistor 115 is connected between the ground terminal 190 and the second input end of the first operational amplifier 111; the output end of the first operational amplifier 111 is connected to the output end of the filter module 120.
[0053] In an exemplary embodiment of this utility model, the first end and the second end of the differential signal source are connected to the non-inverting input and the inverting input of the first operational amplifier 111 respectively through the first resistor 112 and the third resistor 114. The second resistor 113 introduces the second reference voltage to the non-inverting input, and the fourth resistor 115 is grounded to the inverting input.
[0054] Optionally, the resistance of the first resistor 112 is equal to the resistance of the third resistor 114, and the resistance of the second resistor 113 is equal to the resistance of the fourth resistor 115.
[0055] Specifically, when the resistance of the first resistor 112 is equal to the resistance of the third resistor 114, and the resistance of the second resistor 113 is equal to the resistance of the fourth resistor 115, the first operational amplifier 111 only amplifies the first sampled signal and the second sampled signal, suppressing common-mode interference.
[0056] In this embodiment of the invention, the formula for calculating the voltage of the first differential signal output by the first operational amplifier 111 is as follows:
[0057] Vo = Vref2 + R2 / R1 * (Vin) + -Vin - )
[0058] Where Vo is the voltage value of the first differential signal, Vref2 is the second reference voltage value output by the second reference signal source 160, R2 is the resistance value of the second resistor 113, R1 is the resistance value of the first resistor 112, and Vin... + Vin represents the voltage value of the first sampled signal. - This is the voltage value of the second sampled signal.
[0059] Based on the above embodiments, alternatively, refer to the following: Figure 3 The signal processing module 130 includes: a second operational amplifier 131, a fifth resistor 132, and a sixth resistor 133; the first input terminal of the second operational amplifier 131 is connected to the output terminal of the filter module 120; the fifth resistor 132 is connected between the output terminal of the first reference signal source 150 and the second input terminal of the second operational amplifier 131; and the sixth resistor 133 is connected between the second input terminal of the second operational amplifier 131 and the output terminal of the second operational amplifier 131.
[0060] In this embodiment of the invention, the formula for calculating the voltage of the adjustment signal output by the signal processing module 130 is as follows:
[0061] (Vref1-V1) / R5=(V1-Vout) / R6
[0062] Vout = V1 - (Vref1 - V1)R6 / R5
[0063] Wherein, Vref1 is the voltage value of the first reference voltage output by the first reference signal source 150, V1 is the voltage value of the characteristic signal, R5 is the resistance value of the fifth resistor 132, R6 is the resistance value of the sixth resistor 133, and Vout is the voltage value of the adjustment signal.
[0064] For example, the second operational amplifier 131, the fifth resistor 132, and the sixth resistor 133 can form a non-inverting proportional amplifier circuit or an inverting proportional amplifier circuit to further amplify or adjust the level of the signal output by the filter module 120.
[0065] The technical solution of this invention, through a non-inverting or inverting amplifier circuit combined with a first reference voltage, achieves flexible adjustment of signal gain and DC bias. This invention effectively expands the application range of differential signal processing circuits, enabling them to be used in various scenarios such as sensor signal conditioning and power management.
[0066] Based on the above embodiments, alternatively, refer to the following: Figure 3 The differential signal processing circuit also includes a detection module 170, the input terminal of which is connected to the output terminal of the differential signal sampling module, for detecting the voltage of the first differential signal output by the differential signal sampling module.
[0067] Specifically, the detection module 170 refers to a functional unit in the differential signal processing circuit, used to monitor and display the voltage characteristics of the first differential signal output by the differential signal sampling module in real time. The voltage characteristics of the first differential signal may include amplitude, common-mode voltage, noise, etc.
[0068] For example, the detection module 170 may include a differential amplifier, a window comparator, and a digital signal processor, etc.
[0069] Based on the above embodiments, alternatively, refer to the following: Figure 3 The differential signal processing circuit also includes a peak protection module 180, which is connected to the output terminal of the differential signal sampling module 110 and is used to generate a peak protection signal based on the first differential signal output by the differential signal sampling module 110. The peak protection signal is used to cut off the output of the differential signal sampling module.
[0070] Specifically, the peak protection module 180 refers to the safety protection unit in the differential signal processing circuit. The peak protection module 180 is used to monitor the voltage amplitude of the first differential signal in real time and quickly cut off the current flow path of subsequent circuits when an overvoltage is detected. For example, when an overvoltage is detected, the peak protection module 180 sends a peak protection signal to the subsequent modules connected to it. Upon receiving the peak protection signal, the subsequent modules perform a protection action, disconnecting from the differential signal processing circuit. The peak protection signal refers to the signal output by the peak protection module 180. In this embodiment of the invention, the detection module 170 detects and displays real-time voltage data, and the peak protection module 180 performs a rapid protection action. The detection module 170 and the peak protection module 180 can improve the reliability of the differential signal processing circuit.
[0071] This utility model embodiment also provides a component-level power electronic device, including: the differential signal processing circuit provided in any of the above embodiments, having the corresponding functional modules and beneficial effects of the differential signal processing circuit.
[0072] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.
[0073] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A differential signal processing circuit, characterized in that, include: Differential signal sampling module, filtering module, and signal processing module; The first input terminal of the differential signal sampling module is connected to the first terminal of the differential signal source to receive a first sampling signal; the second input terminal of the differential signal sampling module is connected to the second terminal of the differential signal source to receive a second sampling signal; the differential signal sampling module is used to output a first differential signal based on the first sampling signal and the second sampling signal output by the differential signal source. The input terminal of the filtering module is connected to the output terminal of the differential signal sampling module, and is used to receive the first differential signal output by the differential signal sampling module and extract the feature signals contained in the first differential signal. The first input terminal of the signal processing module is connected to the output terminal of the filtering module to receive the feature signal; the second input terminal of the signal processing module is connected to the first reference signal source, and the signal processing module is used to output an adjustment signal according to the feature signal; wherein, the adjustment signal is used to correct the DC offset in the feature signal.
2. The differential signal processing circuit according to claim 1, characterized in that, The filtering module includes: A multi-stage RC filter unit, wherein the input terminal of the multi-stage RC filter unit is connected to the output terminal of the differential signal sampling module, and is used to output a first DC signal based on the first differential signal; wherein the characteristic signal includes the first DC signal.
3. The differential signal processing circuit according to claim 1, characterized in that, The filtering module includes: A Butterworth filter unit, the input of which is connected to the output of the differential signal sampling module, is used to output a first effective value signal based on the first differential signal; wherein the characteristic signal includes the first effective value signal.
4. The differential signal processing circuit according to claim 1, characterized in that, The filtering module includes: A moving average filtering unit, the input of which is connected to the output of the differential signal sampling module, is used to output a first average signal based on the first differential signal; wherein the characteristic signal includes the first average signal.
5. The differential signal processing circuit according to claim 1, characterized in that, The differential signal sampling module includes: a first operational amplifier, a first resistor, a second resistor, a third resistor, and a fourth resistor; The first end of the first resistor is connected to the first end of the differential signal source, and the second end of the first resistor is connected to the first input end of the first operational amplifier; The second resistor is connected between the output terminal of the second reference signal source and the first input terminal of the first operational amplifier; The first end of the third resistor is connected to the second end of the differential signal source, and the second end of the third resistor is connected to the second input end of the first operational amplifier. The fourth resistor is connected between the ground terminal and the second input terminal of the first operational amplifier; The output terminal of the first operational amplifier is connected to the output terminal of the filter module.
6. The differential signal processing circuit according to claim 5, characterized in that, The resistance value of the first resistor is equal to the resistance value of the third resistor, and the resistance value of the second resistor is equal to the resistance value of the fourth resistor.
7. The differential signal processing circuit according to claim 1, characterized in that, The signal processing module includes: a second operational amplifier, a fifth resistor, and a sixth resistor; The first input terminal of the second operational amplifier is connected to the output terminal of the filter module; The fifth resistor is connected between the output terminal of the first reference signal source and the second input terminal of the second operational amplifier. The sixth resistor is connected between the second input terminal and the output terminal of the second operational amplifier.
8. The differential signal processing circuit according to claim 1, characterized in that, The differential signal processing circuit further includes a detection module, the input terminal of which is connected to the output terminal of the differential signal sampling module, for detecting the voltage of the first differential signal output by the differential signal sampling module.
9. The differential signal processing circuit according to claim 1, characterized in that, The differential signal processing circuit further includes a peak protection module, which is connected to the output terminal of the differential signal sampling module and is used to generate a peak protection signal based on the first differential signal output by the differential signal sampling module. The peak protection signal is used to cut off the output of the differential signal sampling module.
10. A component-level power electronic device, characterized in that, include: The differential signal processing circuit according to any one of claims 1-9.