Harmonic information extraction circuit

Abstract

The invention provides a harmonic information extraction circuit. The harmonic information extraction circuit comprises a sampling module, an amplitude adjustment module and an envelope extraction module. The sampling module is electrically connected to the signal end of the electronic device to obtain a first sampling signal and generate a first output signal, and the first sampling signal comprises a first target frequency band signal, a second target frequency band signal and a non-target frequency band signal. The amplitude adjusting module is electrically connected to the sampling module to receive the first output signal and is used for adjusting the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal, so that the ratio of the amplitude of the first target frequency band signal to the amplitude of the second target frequency band signal is within a preset range, and a second output signal is generated. The envelope extraction module is electrically connected to the amplitude adjustment module to receive the second output signal and extract an envelope of the second output signal.

Description

Technical Field

[0001] The present disclosure relates to a harmonic information extraction circuit, and particularly to a harmonic information extraction circuit capable of extracting harmonic information of a target frequency band from an electronic device. Background Art

[0002] In recent years, with the rapid development of machine learning and artificial intelligence, Prognostics Health Management (PHM) technology has gradually become an emerging trend in the field of equipment operation and maintenance. By extracting relevant health information, this technology can evaluate the current performance status of equipment in real time, timely warn of possible failures, avoid further catastrophic failures, and at the same time, accurately predict the remaining service life of the equipment by combining historical data, so as to reasonably arrange operation and maintenance strategies, fully extend the service life of the equipment and save maintenance costs.

[0003] The key to PHM technology lies in extracting the health information of the equipment. Generally speaking, when the components of the equipment experience performance aging, the time-domain or frequency-domain characteristics of the relevant signals (such as voltage and current signals, vibration signals) during its operation will undergo detectable offsets. By measuring the offsets of the relevant characteristics, the health status of the equipment can be further reflected. However, the relevant characteristics of actual engineering make it extremely difficult to extract health information.

[0004] First of all, the signal feature offset caused by the aging of the equipment or device is usually extremely weak compared to its normal operating signal. Take the DC support capacitor as an example. Its rated working voltage is generally several hundred to thousands of volts, while the increase in harmonic amplitude caused by the attenuation of the capacitance value is usually only a few volts or dozens of millivolts, resulting in the weak changes caused by the aging of the equipment or device being hidden in the high-amplitude operating signal. Therefore, the sampling system needs to be able to shield the influence of the large-amplitude signal and at the same time ensure that the small-amplitude signal has sufficient sampling accuracy. In many cases, the sampling system is difficult to meet the above requirements and has to require the system to stop and measure with the help of additional equipment, which greatly limits the practical application of PHM technology.

[0005] Secondly, the existing health information extraction circuits usually only extract signals of a single frequency band, and the types and quantities of target monitoring components are single and scarce. In reality, the increase in harmonic amplitude caused by the aging of different devices will be unevenly distributed in different frequency bands. Since the existing single extraction circuit can only monitor a small number of components corresponding to a single frequency band, the unit input cost required for PHM technology increases. Considering the cost, the benefits obtained by the PHM strategy with low coverage are also very limited, ultimately resulting in a situation where the input cost and the expected benefits are difficult to balance, reducing the attractiveness of PHM technology.

[0006] Therefore, there is an urgent need to provide a harmonic information extraction circuit that can improve the above-mentioned prior art. Summary of the Invention

[0007] The purpose of the present disclosure is to provide a harmonic information extraction circuit that can extract harmonic signals of one or more target frequency bands required from a normal operation signal when there are multiple harmonic sources in an electronic device.

[0008] To achieve the above object, the present disclosure provides a harmonic information extraction circuit, including a sampling module, an amplitude adjustment module, and an envelope extraction module. The sampling module is electrically connected to the first signal terminal and the second signal terminal of the electronic device to obtain a first sampling signal of the electronic device and generate a first output signal, where the first sampling signal includes a first target frequency band signal, a second target frequency band signal, and a non-target frequency band signal. The amplitude adjustment module is electrically connected to the sampling module to receive the first output signal, and is used to adjust the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal so that the ratio of the amplitude of the first target frequency band signal to the amplitude of the second target frequency band signal is within a preset range, and generate a second output signal. The envelope extraction module is electrically connected to the amplitude adjustment module to receive the second output signal and extract the envelope of the second output signal. Brief Description of the Drawings

[0009] Figure 1 It is a schematic diagram of the architecture of an electronic device and a harmonic information extraction circuit according to an embodiment of the present disclosure.

[0010] Figure 2 Illustrates the amplitude change process of the sampling signal processed by the harmonic information extraction circuit.

[0011] Figure 3A 、 Figure 3B 、 Figure 3C And Figure 3D Illustrates several possible implementation forms of the harmonic information extraction circuit.

[0012] Figure 4 Illustrates the specific circuit structure of the harmonic information extraction circuit according to an embodiment of the present disclosure.

[0013] Figure 5 Illustrates the specific circuit structure of the harmonic information extraction circuit according to another embodiment of the present disclosure.

[0014] Figure 6 Illustrates the specific circuit structure of the harmonic information extraction circuit according to another embodiment of the present disclosure.

[0015] Description of the Reference Numerals:

[0016] 1: Harmonic information extraction circuit

[0017] 100: Electronic device

[0018] 10: Sampling module

[0019] 20: Amplitude adjustment module

[0020] 30: Envelope extraction module

[0021] 101: First signal terminal

[0022] 102: Second signal terminal

[0023] 103: Third signal terminal

[0024] 10a: Sampling module

[0025] R1, R2, R3: Resistors

[0026] C1: Capacitor

[0027] D1, D2: Diodes

[0028] 20a: Amplitude adjustment module

[0029] Am1: Operational amplifier

[0030] R4, R5, R6, R7, R8, R9: Resistors

[0031] C2, C3, C4: Capacitors

[0032] 30a: Envelope extraction module

[0033] R10: Resistor

[0034] C5: Capacitor

[0035] D3: Diode

[0036] Am2, Am3: Operational amplifiers

[0037] 10b: Sampling module

[0038] R11, R12, R13, R14, R15, R16: Resistors

[0039] C6, C7: Capacitors

[0040] D4, D5: Zener diodes

[0041] 20b: Amplitude adjustment module

[0042] Am4, Am5: Operational amplifiers

[0043] R17, R18, R19, R20, R21, R22, R23, R24, R25: Resistors

[0044] C8, C9, C10, C11, C12: capacitors

[0045] 30b: Envelope extraction module

[0046] D6: diode

[0047] R26: resistor

[0048] C13: capacitor

[0049] 10c: Sampling module

[0050] R27, R28, R29, R30, R31, R32: resistors

[0051] C14, C15: capacitors

[0052] 20c: Amplitude adjustment module

[0053] Am6, Am7: Operational amplifiers

[0054] R33, R34, R35, R36, R37, R38: resistors

[0055] C16, C17, C18, C19: capacitors

[0056] 30c: Envelope Extraction Module

[0057] Am8: Operational Amplifier

[0058] R39, R40, R41: resistors

[0059] C20, C21: capacitors

[0060] D7: diode DETAILED DESCRIPTION

[0061] Some typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various variations in different embodiments without departing from the scope of the present disclosure, and the descriptions and illustrations therein are essentially for illustration only and are not intended to limit the present disclosure.

[0062] As used in this disclosure, the terms "including," "comprising," and "having" are open-ended terms, meaning inclusion but not limitation. Furthermore, "coupled" or "connected" as used in this application may refer to two or more elements being in direct physical or electrical contact, or indirect physical or electrical contact, with one another.

[0063] Figure 1 FIG. 1 is a schematic diagram of the structure of an electronic device and a harmonic information extraction circuit according to an embodiment of the present disclosure. Figure 1As shown, the harmonic information extraction circuit 1 includes a sampling module 10, an amplitude adjustment module 20, and an envelope extraction module 30. The sampling module 10 is electrically connected to the first signal terminal and the second signal terminal of the electronic device 100, and is used to obtain the first sampling signal of the electronic device 100 and generate a first output signal. Among them, the first sampling signal includes a first target frequency band signal, a second target frequency band signal, and a non-target frequency band signal. The first target frequency band signal and the second target frequency band signal are generated by different harmonic sources in the electronic device 100. When the devices corresponding to different harmonic sources age or their performance decays, the harmonic characteristics (harmonic amplitude or frequency) of different target frequency band signals will change. After the first sampling signal passes through the sampling module 10, the non-target frequency band signal therein is greatly suppressed. Therefore, in the first output signal, the influence of the non-target frequency band signal can be ignored.

[0064] The amplitude adjustment module 20 is electrically connected to the sampling module 10 to receive the first output signal, and is used to adjust the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal, so that the ratio of the amplitude of the first target frequency band signal to the amplitude of the second target frequency band signal is within a preset range, and a second output signal is generated. It should be noted that according to actual needs, the amplitude adjustment module 20 can adjust the amplitudes of one or more target frequency band signals in the first output signal, so that the second output signal focuses on reflecting the information of the required target frequency band signal. For example, in some embodiments, the amplitude adjustment module 20 can adjust the amplitudes of the first target frequency band signal and the second target frequency band signal at the same time, so that the second output signal reflects the information of the first target frequency band signal and the second target frequency band signal at the same time. Further, the second output signal can reflect the information of the first target frequency band signal and the second target frequency band signal with the same weight, and is used to judge the health status of the devices related to the two harmonic sources corresponding to the first target frequency band signal and the second target frequency band signal. In other embodiments, the amplitude adjustment module 20 can only adjust the amplitude of the second target frequency band signal and greatly suppress the second target frequency band signal, so that the second output signal only reflects the information of the first target frequency band signal, thereby specifically judging the health status of the device related to the harmonic source corresponding to the first target frequency band signal. Of course, the amplitude adjustment module 20 can also only adjust the amplitude of the first target frequency band signal and greatly suppress the first target frequency band signal, so that the second output signal only reflects the information of the second target frequency band signal, thereby specifically judging the health status of the device related to the harmonic source corresponding to the second target frequency band signal.

[0065] The envelope extraction module 30 is electrically connected to the amplitude adjustment module 20 to receive the second output signal, and extracts the envelope of the second output signal. Among them, the extracted envelope reflects the amplitude and frequency of the second output signal.

[0066] Thereby, the harmonic information extraction circuit 1 can extract the complete harmonic signals of one or more target frequency bands required from the normal operation signals when there are multiple harmonic sources in the electronic device 100. Based on the extracted harmonic signals, the health status (performance status) of the electronic device 100 and its components can be evaluated. For example, according to the amplitude and frequency characteristics included in the output signals, the judgment of the health status of the electronic device 100 and its components can be achieved by combining data processing, machine learning, artificial intelligence algorithms, and so on.

[0067] In some embodiments, the sampling module 10 includes at least one filtering unit for suppressing the amplitude of the non-target frequency band signals. Through the suppression of the filtering unit, in the first output signal, the influence of the non-target frequency band signals can be negligible, while the attenuation of the target frequency band signals is relatively small. In addition, according to the magnitude relationship between the frequencies of the non-target frequency band signals and the target frequency band signals, the filtering unit can include different forms of filters to allow the target frequency band signals to pass through and simultaneously suppress the non-target frequency band signals. For example, when the frequency of the non-target frequency band signals is lower than the frequency of the target frequency band signals, the filtering unit can include a high-pass filter or a band-pass filter. On the contrary, when the frequency of the non-target frequency band signals is higher than the frequency of the target frequency band signals, the filtering unit can include a low-pass filter or a band-pass filter. Additionally, in some embodiments, the filtering unit causes the amplitude attenuation of the first target frequency band signal and the second target frequency band signal not to exceed a preset threshold, where the preset threshold can be, for example but not limited to, 0.3, so as to retain the harmonic information of the first target frequency band signal and the second target frequency band signal as much as possible.

[0068] In some embodiments, the sampling module 10 includes a voltage dividing unit for dividing the voltage and limiting the current of the first sampling signal, so that the maximum value of the amplitude of the first output signal does not exceed the rated operating range of the amplitude adjustment module 20.

[0069] In some embodiments, the sampling module 10 includes a clamping unit for voltage clamping the first sampling signal, so that the maximum value of the amplitude of the first output signal does not exceed the rated operating range of the amplitude adjustment module 20.

[0070] In some embodiments, the amplitude adjustment module 20 includes a band-pass filter, where the band-pass filter includes an active band-pass filter or a passive band-pass filter, and is used to adjust the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal, so that the ratio of the amplitude of the first target frequency band signal to the amplitude of the second target frequency band signal is within a preset range. The preset range can be, for example but not limited to, [0.01, 100]. In addition, according to the information of the target frequency band signal reflected by the envelope of the second output signal, the preset range can be further divided. For example, when the preset range is [0.2, 5], the envelope of the second output signal reflects the relevant information (frequency and amplitude) of both the first target frequency band signal and the second target frequency band signal; when the preset range is [0.01, 0.2), at this time the influence of the amplitude of the first target frequency band signal on the envelope of the second output signal can be ignored, so it can be considered that the envelope of the second output signal only reflects the relevant information of the second target frequency band signal; when the preset range is (5, 100], at this time the influence of the amplitude of the second target frequency band signal on the envelope of the second output signal can be ignored, so it can be considered that the envelope of the second output signal only reflects the relevant information of the first target frequency band signal.

[0071] It should be noted that for the sake of understanding, the present disclosure uses the first sampling signal, the first target frequency band signal, and the second target frequency band signal as examples for illustration. However, in fact, the number of sampling signals received by the sampling module 10 and the number of target frequency bands included in each sampling signal are not limited. In addition, in some embodiments, the amplitude adjustment module 20 also receives a second sampling signal, where the second sampling signal includes a third target frequency band signal, and the third target frequency band signal reflects the relevant information (frequency and amplitude) of another harmonic source in the electronic device 100. The amplitude adjustment module 20 adjusts the amplitude of the third target frequency band signal so that the ratio of the amplitude of the third target frequency band signal to the amplitude of one of the target frequency band signals of the first output signal (such as the first target frequency band signal) is within a preset range. Accordingly, the input signal of the amplitude adjustment module 20 includes the relevant information of the first target frequency band signal, the second target frequency band signal, and the third target frequency band signal. By changing the amplitude-frequency characteristics of the amplitude adjustment module 20, a second output signal containing the information of different target frequency band signals can be obtained. For example, by greatly suppressing the first target frequency band signal, the influence of the first target frequency band signal on the second output signal can be ignored, so that the second output signal reflects the relevant amplitude and frequency information of the second target frequency band signal and the third target frequency band signal. In addition, when the amplitude adjustment module 20 receives the second sampling signal, the band-pass filter of the amplitude adjustment module 20 can also be used to suppress the DC component and / or high-frequency noise in the second sampling signal.

[0072] The second sampling signal can be obtained by sampling from any location of the electronic device 100. In some embodiments, the amplitude adjustment module 20 further includes a signal amplification circuit, wherein the signal amplification circuit is electrically connected between the bandpass filter of the amplitude adjustment module 20 and the envelope extraction module 30, and is used to provide the second sampling signal. In addition, if the second sampling signal includes a DC component, the amplitude adjustment module 20 may further include a high-pass filter, wherein the high-pass filter is electrically connected between the bandpass filter of the amplitude adjustment module 20 and the envelope extraction module 30, and is used to suppress the DC component in the second sampling signal.

[0073] Figure 2 The example shows the amplitude change process of the sampled signal after being processed by the harmonic information extraction circuit 1. Figure 2 As shown, in this example, the sampling module 10 suppresses the amplitude of the non-target frequency band signal in the first sampling signal, the amplitude adjustment module 20 receives the third target frequency band signal, and adjusts the amplitudes of the first target frequency band signal, the second target frequency band signal and the third target frequency band signal to a similar level, and generates a second output signal accordingly, so that the envelope finally extracted from the second output signal simultaneously reflects the relevant information of the first target frequency band signal, the second target frequency band signal and the third target frequency band signal.

[0074] As the number of first sampling signals and the form of frequency band signals vary, the specific implementation of the harmonic information extraction circuit 1 also varies. Figure 3A 、 Figure 3B 、 Figure 3C and Figure 3D Several possible implementations of the harmonic information extraction circuit 1 are illustrated, but it should be noted that the present disclosure is not limited to these examples.

[0075] In a first embodiment, the first sampling signal includes a plurality of target frequency band signals. Figure 3A As shown, sampling module 10 is electrically connected to first signal terminal 101 and second signal terminal 102 of electronic device 100, where second signal terminal 102 is grounded, to receive a first sampling signal comprising a first target frequency band signal and a second target frequency band signal. In this case, amplitude adjustment module 20 can utilize the amplitude-frequency characteristics of the filter circuit to adjust the amplitude of the signals in different target frequency bands.

[0076] In a second embodiment, the first sampling signal includes a plurality of target frequency band signals, and the plurality of target frequency band signals include differential mode components and common mode components. Figure 3BAs illustrated, the sampling module 10 is electrically connected to the first signal terminal 101, the second signal terminal 102, and the ground terminal of the electronic device 100 to receive a first sampling signal, where the first signal terminal 101 and the second signal terminal 102 provide a first target frequency band signal presenting a differential mode component in the first sampling signal, and the second signal terminal 102 and the ground terminal provide a second target frequency band signal presenting a common mode component in the first sampling signal. In this case, the amplitude adjustment module 20 can utilize the common mode rejection characteristic of the differential operational amplifier circuit to achieve amplitude adjustment of different target frequency band signals.

[0077] In the third implementation aspect, multiple first sampling signals respectively include multiple target frequency band signals. As Figure 3C illustrated, a part of the sampling module 10 is electrically connected to the first signal terminal 101 and the ground terminal of the electronic device 100 to receive the first target frequency band signal in the first sampling signal, and another part of the sampling module 10 is electrically connected to the second signal terminal 102 and the ground terminal of the electronic device 100 to receive the second target frequency band signal in the first sampling signal. In this case, the amplitude adjustment module 20 can utilize operational amplifier circuits with different gains to achieve amplitude adjustment of different target frequency band signals in different sampling signals.

[0078] In the fourth implementation aspect, the first sampling signal includes multiple target frequency band signals, and the amplitude adjustment module 20 of the harmonic information extraction circuit 1 also receives a second sampling signal. As Figure 3D illustrated, the sampling module 10 is electrically connected to the first signal terminal 101 and the second signal terminal 102 of the electronic device 100, where the second signal terminal 102 is the ground terminal, to receive the first sampling signal including the first target frequency band signal and the second target frequency band signal, and the amplitude adjustment module 20 is electrically connected to the third signal terminal 103 and the ground terminal of the electronic device 100 to receive the second sampling signal including the third target frequency band signal. In this case, the amplitude adjustment module 20 can utilize various methods to achieve amplitude adjustment of the first target frequency band signal, the second target frequency band signal, and the third target frequency band signal. For example, in this embodiment, the amplitude-frequency characteristic of the filter circuit can be utilized to achieve amplitude adjustment of the first target frequency band signal and the second target frequency band signal, and simultaneously adjust the amplitude of the third target frequency band signal, and then generate a second output signal based on the adjusted first target frequency band signal, second target frequency band signal, and third target frequency band signal.

[0079] Figure 4 Illustrates the specific circuit structure of the harmonic information extraction circuit according to an embodiment of the present disclosure. As Figure 4As shown, in this embodiment, the sampling module 10a includes a filtering unit, a voltage dividing unit, and a clamping unit. The voltage dividing unit includes resistors R1 and R2. The first end of resistor R1 is electrically connected to the first signal terminal 101, the second end of resistor R1 is electrically connected to the first end of resistor R2, and the second end of resistor R2 is electrically connected to the second signal terminal 102 and the ground terminal. Resistor R1 may have a relatively large resistance value to play a current limiting role. The filtering unit includes capacitor C1 and resistor R3. The two ends of capacitor C1 are respectively electrically connected to the second end of resistor R1 and the first end of resistor R3, and the second end of resistor R3 is grounded. The clamping unit includes diodes D1 and D2 connected in series. The cathode of diode D1 is electrically connected to a DC power supply to ensure that the input voltage of the amplitude adjustment module 20a does not exceed the rated operating range of the operational amplifier Am1. The anode of diode D1 is electrically connected to the cathode of diode D2 and the first end of resistor R3, and the anode of diode D2 is grounded.

[0080] The amplitude adjustment module 20a includes a band-pass filter and a high-pass filter. The band-pass filter includes operational amplifier Am1, resistors R4, R5, R6, R7, and R8, and capacitors C2 and C3. The first end of resistor R4 is electrically connected to the sampling module 10a. The two ends of capacitor C2 are respectively electrically connected to the second end of resistor R4 and the non-inverting input terminal of operational amplifier Am1. The two ends of resistor R5 are respectively electrically connected to the non-inverting input terminal of operational amplifier Am1 and the third signal terminal 103 (providing a second sampling signal), where the third signal terminal 103 is a DC power supply. The two ends of resistor R6 are respectively electrically connected to the second end of resistor R4 and the output terminal of operational amplifier Am1. The first end of capacitor C3 is electrically connected to the second end of resistor R4. The second end of capacitor C3 is electrically connected to the third signal terminal 103 and the first end of resistor R7. The second end of resistor R7 is electrically connected to the inverting input terminal of operational amplifier Am1 and the first end of resistor R8, and the second end of resistor R8 is electrically connected to the output terminal of operational amplifier Am1. The band-pass filter has different gains for different frequencies, so it can be used to perform different amplitude adjustments on signals in different frequency bands. The high-pass filter includes capacitor C4 and resistor R9. The two ends of capacitor C4 are respectively electrically connected to the output terminal of operational amplifier Am1 and the first end of resistor R9, and the second end of resistor R9 is grounded. The high-pass filter can be used to suppress the DC component in the signal received from the third signal terminal 103.

[0081] The envelope extraction module 30a includes a diode D3, a resistor R10, and a capacitor C5. The anode of the diode D3 is electrically connected to the amplitude adjustment module 20a. The two ends of the resistor R10 are respectively electrically connected to the cathode of the diode D3 and the ground terminal. The capacitor C5 is connected in parallel across the two ends of the resistor R10. In some embodiments, the envelope extraction module 30a further includes a voltage follower formed by an operational amplifier Am2. The non-inverting input terminal of the operational amplifier Am2 is electrically connected to the amplitude adjustment module 20a. The output terminal of the operational amplifier Am2 is electrically connected to the anode of the diode D3. The inverting input terminal of the operational amplifier Am2 is electrically connected to the cathode of the diode D3. Since the diode D3 has a conduction voltage drop of approximately 0.7V, therefore, by adding a voltage follower, the conduction voltage drop of the diode can be compensated. In some embodiments, the envelope extraction module 30a further includes an operational amplifier Am3. Its non-inverting input terminal is electrically connected to the cathode of the diode D3. The operational amplifier Am3 is also a voltage follower, used to increase the output signal gain and at the same time increase the output impedance of the circuit, ensuring that the charge and discharge network composed of the resistor R10 and the capacitor C5 is not affected by the subsequent circuit.

[0082] Figure 5 Illustrates the specific circuit structure of the harmonic information extraction circuit according to another embodiment of the present disclosure. In this embodiment, in the first sampling signal provided by the first signal terminal 101 and the second signal terminal 102, the first target frequency band signal is a differential mode signal, and the second target frequency band signal is a common mode signal. As Figure 5As shown, the sampling module 10b includes a first filtering unit and a second filtering unit, a first voltage dividing unit and a second voltage dividing unit, and a first clamping unit and a second clamping unit. The first voltage dividing unit is electrically connected to the first signal terminal 101 and the ground terminal, and includes resistors R11 and R12. The second voltage dividing unit is electrically connected to the second signal terminal 102, the first voltage dividing unit and the ground terminal, and includes resistors R13 and R14. Two ends of the resistor R11 are respectively electrically connected to the first signal terminal 101 and the first end of the resistor R12. The second end of the resistor R12 is electrically connected to the ground terminal and the first end of the resistor R13. Two ends of the resistor R14 are respectively electrically connected to the second signal terminal 102 and the second end of the resistor R13. The resistors R11 and R14 may have relatively large resistance values to play a current limiting role. The first filtering unit is electrically connected to the first voltage dividing unit and the ground terminal, and includes a capacitor C6 and a resistor R15. The second filtering unit is electrically connected to the second voltage dividing unit and the ground terminal, and includes a capacitor C7 and a resistor R16. Two ends of the capacitor C6 are respectively electrically connected to the first end of the resistor R12 and the first end of the resistor R15. The second end of the resistor R15 is electrically connected to the ground terminal and the first end of the resistor R16. Two ends of the capacitor C7 are respectively electrically connected to the second end of the resistor R13 and the second end of the resistor R16. The first filtering unit and the second filtering unit can be used for high-pass filtering. The first clamping unit is electrically connected to the first filtering unit and the ground terminal, and includes a Zener diode D4. The second clamping unit is electrically connected to the second filtering unit and the ground terminal, and includes a Zener diode D5. The cathode of the Zener diode D4 is electrically connected to the first end of the resistor R15. The anode of the Zener diode D4 is electrically connected to the ground terminal and the anode of the Zener diode D5. The cathode of the Zener diode D5 is electrically connected to the second end of the resistor R16.

[0083] The amplitude adjustment module 20b includes a band-pass filter, a signal amplification circuit, and a high-pass filter. The band-pass filter includes an operational amplifier Am4, resistors R17, R18, R19, R20, R21, and R22, and capacitors C8, C9, C10, and C11. The first end of resistor R17 is electrically connected to the sampling module 10b (the cathode of the Zener diode D4), the second end of resistor R17 is electrically connected to the first ends of resistor R19, capacitor C8, and capacitor C10, the second end of resistor R19 is electrically connected to the third signal terminal 103, the third signal terminal 103 is a DC power supply, the second end of capacitor C10 is electrically connected to the first end of resistor R21 and the inverting input terminal of the operational amplifier Am4, and the second ends of capacitor C8 and resistor R21 are both electrically connected to the output terminal of the operational amplifier Am4. The first end of resistor R18 is electrically connected to the sampling module 10b (the cathode of the Zener diode D5), the second end of resistor R18 is electrically connected to the first ends of resistor R20, capacitor C9, and capacitor C11, the second end of resistor R20 is electrically connected to the third signal terminal 103, the second end of capacitor C11 is electrically connected to the first end of resistor R22 and the non-inverting input terminal of the operational amplifier Am4, and the second ends of capacitor C9 and resistor R22 are connected to each other. By virtue of the characteristic that the differential operational amplifier circuit has different amplitude adjustments for different forms of signals (common-mode signals and differential-mode signals), a second output signal is generated. The signal amplification circuit includes resistors R23 and R24 and an operational amplifier Am5, wherein the two ends of resistor R23 are respectively electrically connected to the output terminal of the operational amplifier Am4 and the inverting input terminal of the operational amplifier Am5, the two ends of resistor R24 are respectively electrically connected to the inverting input terminal and the output terminal of the operational amplifier Am5, and the non-inverting input terminal of the operational amplifier Am5 is electrically connected to the third signal terminal 103. The high-pass filter includes a capacitor C12 and a resistor R25, wherein the two ends of capacitor C12 are respectively electrically connected to the output terminal of the operational amplifier Am5 and the first end of resistor R25, and the second end of resistor R25 is grounded. The high-pass filter can be used to suppress the DC component in the signal received from the third signal terminal 103.

[0084] The envelope extraction module 30b includes a diode D6, a resistor R26, and a capacitor C13, wherein the anode of the diode D6 is electrically connected to the amplitude adjustment module 20b, the two ends of the resistor R26 are respectively electrically connected to the cathode of the diode D6 and the ground terminal, and the capacitor C13 is connected in parallel across the two ends of the resistor R26.

[0085] Figure 6 Illustrates the specific circuit structure of the harmonic information extraction circuit according to another embodiment of the present disclosure. In this embodiment, the first target frequency band signal is included in the first sampling signal provided by the first signal terminal 101, and the second target frequency band signal is included in the first sampling signal provided by the second signal terminal 102. As Figure 6As shown, the sampling module 10c includes a first filtering unit, a second filtering unit, a first voltage dividing unit, and a second voltage dividing unit. The first voltage dividing unit is electrically connected to the first signal terminal 101 and the ground terminal, and is used for dividing the voltage and limiting the current of the first target frequency band signal, and includes resistors R27 and R28 connected in series between the first signal terminal 101 and the ground terminal. The first filtering unit is electrically connected to the first voltage dividing unit and the ground terminal. Among them, the first filtering unit is a low-pass filtering unit and includes a resistor R29 and a capacitor C14. The first end of the resistor R29 is electrically connected to the common node between the resistors R27 and R28, and the two ends of the capacitor C14 are respectively electrically connected to the second end of the resistor R29 and the ground terminal. The second voltage dividing unit is electrically connected to the second signal terminal 102 and the ground terminal, and is used for dividing the voltage and limiting the current of the second target frequency band signal, and includes resistors R30 and R31 connected in series between the second signal terminal 102 and the ground terminal. The second filtering unit is electrically connected to the second voltage dividing unit and the ground terminal. Among them, the second filtering unit is a low-pass filtering unit and includes a resistor R32 and a capacitor C15. The first end of the resistor R32 is electrically connected to the common node between the resistors R30 and R31, and the two ends of the capacitor C15 are respectively electrically connected to the second end of the resistor R32 and the ground terminal.

[0086] The amplitude adjustment module 20c includes a first high-pass filter and a second high-pass filter (both are active high-pass filters). The first high-pass filter includes an operational amplifier Am6, resistors R33, R34, and R35, and capacitors C16 and C17. The two ends of the capacitor C16 are respectively electrically connected to the first filtering unit of the sampling module 10c and the first end of the resistor R33. The inverting input terminal of the operational amplifier Am6 is electrically connected to the second end of the resistor R33, the first end of the capacitor C17, and the first end of the resistor R34. The non-inverting input terminal of the operational amplifier Am6 is grounded. The output terminal of the operational amplifier Am6 is electrically connected to the second end of the capacitor C17, the second end of the resistor R34, and the first end of the resistor R35. The second high-pass filter includes an operational amplifier Am7, resistors R36, R37, and R38, and capacitors C18 and C19. The two ends of the capacitor C18 are respectively electrically connected to the second filtering unit of the sampling module 10c and the first end of the resistor R36. The inverting input terminal of the operational amplifier Am7 is electrically connected to the second end of the resistor R36, the first end of the capacitor C19, and the first end of the resistor R37. The non-inverting input terminal of the operational amplifier Am7 is grounded. The output terminal of the operational amplifier Am7 is electrically connected to the second end of the capacitor C19, the second end of the resistor R37, and the first end of the resistor R38. The second ends of the resistors R35 and R38 are connected.

[0087] The envelope extraction module 30c includes an operational amplifier Am8, resistors R39, R40, and R41, capacitors C20 and C21, and a diode D7. The first end of the resistor R39 is electrically connected to the amplitude adjustment module 20c (the second ends of the resistors R35 and R38), and the second end of the resistor R39 is electrically connected to the first end of the resistor R40, the first end of the capacitor C20, the cathode of the diode D7, and the non-inverting input terminal of the operational amplifier Am8. The second end of the resistor R40, the second end of the capacitor C20, the anode of the diode D7, and the inverting input terminal of the operational amplifier Am8 are grounded. The two ends of the capacitor C21 are respectively electrically connected to the output terminal and the ground terminal of the operational amplifier Am8, and the resistor R41 is connected in parallel with the capacitor C21.

[0088] It should be noted that in each of the embodiments and implementation manners illustrated in the present disclosure, the resistors and capacitors of the envelope extraction module have corresponding charge and discharge time constants (such as the charge and discharge periods), and this charge and discharge time constant is greater than the time constant corresponding to the highest frequency in all target band signals (such as the period corresponding to the highest frequency, that is, the reciprocal of the highest frequency), thereby reducing the sampling frequency requirements of the subsequent sampling circuit while extracting the harmonic information of the required frequency band.

[0089] The specific topology of the electronic device to which the harmonic information extraction circuit of the present disclosure is applicable is not limited.

[0090] In summary, the present disclosure provides a harmonic information extraction circuit that can extract the harmonic signals of one or more target frequency bands required from the normal operation signals in the case where there are multiple harmonic sources in an electronic device, while suppressing the signals of non-target frequency bands, and can know the health status of the components of the electronic device by extracting the harmonic information.

[0091] It should be noted that the above are only preferred embodiments proposed for explaining the present disclosure. The present disclosure is not limited to the described embodiments, and the scope of the present disclosure is determined by the claims. And the present disclosure can be variously modified by those skilled in the art, but all do not depart from the protection scope of the claims.

Claims

1. A harmonic information extraction circuit comprising: A sampling module is electrically connected to a first signal terminal and a second signal terminal of an electronic device, and is used to obtain a first sampling signal of the electronic device and generate a first output signal, wherein: The first sampling signal includes a first target frequency band signal, a second target frequency band signal and a non-target frequency band signal; an amplitude adjustment module, electrically connected to the sampling module to receive the first output signal, configured to adjust the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal so that a ratio of the amplitude of the first target frequency band signal to the amplitude of the second target frequency band signal is within a preset range, and generate a second output signal; as well as An envelope extraction module is electrically connected to the amplitude adjustment module to receive the second output signal and extract the envelope of the second output signal.

2. The harmonic information extraction circuit according to claim 1, wherein: The sampling module includes: At least one filtering unit is electrically connected to the first signal terminal, the second signal terminal, a ground terminal, and the amplitude adjustment module, and is used to suppress the amplitude of the non-target frequency band signal.

3. The harmonic information extraction circuit according to claim 1, wherein: The sampling module includes at least one filtering unit. When the frequency of the non-target frequency band signal is lower than the frequency of the first target frequency band signal and the second target frequency band signal, the at least one filtering unit includes a high-pass filter or a band-pass filter for passing the first target frequency band signal and the second target frequency band signal.

4. The harmonic information extraction circuit according to claim 1, wherein: The sampling module includes at least one filtering unit. When the frequency of the non-target frequency band signal is higher than the frequency of the first target frequency band signal and the second target frequency band signal, the at least one filtering unit includes a low-pass filter or a band-pass filter for passing the first target frequency band signal and the second target frequency band signal.

5. The harmonic information extraction circuit according to any one of claims 2 to 4, wherein: The sampling module further includes: A voltage divider unit is electrically connected to the first signal terminal and the second signal terminal, and is used to divide the voltage and limit the current of the first sampling signal so that the maximum amplitude of the first output signal does not exceed the rated working range of the amplitude adjustment module.

6. The harmonic information extraction circuit according to any one of claims 2 to 4, wherein: The sampling module further includes: A clamping unit is electrically connected to the at least one filtering unit, and is used to perform voltage clamping on the first output signal so that the maximum amplitude of the first output signal does not exceed the rated working range of the amplitude adjustment module.

7. The harmonic information extraction circuit according to claim 2, wherein: The at least one filtering unit ensures that the attenuation of the amplitude of the first target frequency band signal and the amplitude of the second target frequency band signal do not exceed a preset threshold.

8. The harmonic information extraction circuit according to claim 7, wherein: The preset threshold is 0.

3.

9. The harmonic information extraction circuit according to claim 1, wherein: The first target frequency band signal is a differential mode signal, the second target frequency band signal is a common mode signal, and the sampling module includes: a first voltage dividing unit, electrically connected to the first signal terminal and the ground terminal; a first filtering unit electrically connected to the first voltage dividing unit and the ground terminal; a first clamping unit electrically connected to the first filtering unit and the ground terminal; a second voltage dividing unit, electrically connected to the second signal terminal, the first voltage dividing unit and the ground terminal; a second filtering unit electrically connected to the second voltage dividing unit and the ground terminal; and The second clamping unit is electrically connected to the second filtering unit and the ground end.

10. The harmonic information extraction circuit according to claim 1, wherein: The sampling module includes: a first voltage dividing unit, electrically connected to the first signal terminal and the ground terminal, for performing voltage division and current limiting on the first target frequency band signal; a first filtering unit electrically connected to the first voltage dividing unit and the ground terminal; a second voltage dividing unit, electrically connected to the second signal terminal and the ground terminal, for performing voltage division and current limiting on the second target frequency band signal; and The second filtering unit is electrically connected to the second voltage dividing unit and the ground end.

11. The harmonic information extraction circuit according to claim 1, wherein: The amplitude adjustment module includes: At least one bandpass filter is electrically connected between the sampling module and the envelope extraction module, wherein the at least one bandpass filter includes an active bandpass filter or a passive bandpass filter, and is used to adjust the amplitude of the first target frequency band signal and / or the amplitude of the second target frequency band signal.

12. The harmonic information extraction circuit according to claim 11, wherein: The amplitude adjustment module further receives a second sampling signal, where the second sampling signal includes a third target frequency band signal, and a ratio of the amplitude of the third target frequency band signal to the amplitude of the first target frequency band signal is within the preset range.

13. The harmonic information extraction circuit according to claim 12, wherein: The amplitude adjustment module also includes: A signal amplifying circuit is electrically connected between the at least one bandpass filter and the envelope extraction module, and is used to provide the second sampling signal.

14. The harmonic information extraction circuit according to claim 12, wherein: The amplitude adjustment module also includes: A high-pass filter is electrically connected to the at least one band-pass filter and the envelope extraction module, and is used to suppress a DC component in the second sampling signal.

15. The harmonic information extraction circuit according to claim 12, wherein: The at least one bandpass filter is further configured to suppress a direct current component and / or high-frequency noise in the second sampling signal.

16. The harmonic information extraction circuit according to claim 12, wherein: A charging and discharging time constant of the envelope extraction unit is greater than a time constant corresponding to a highest frequency among the first target frequency band signal, the second target frequency band signal, and the third target frequency band signal.

17. The harmonic information extraction circuit according to claim 1, wherein: The preset range is [0.01, 100].

18. The harmonic information extraction circuit according to claim 17, wherein: The preset range includes: A first preset range, wherein the first preset range is [0.2, 5]; A second preset range, wherein the second preset range is [0.01, 0.2); and The third preset range is (5,100]; Among them, when the preset range is the first preset range, the envelope of the second output signal simultaneously reflects the relevant information of the first target frequency band signal and the second target frequency band signal; when the preset range is the second preset range, the envelope of the second output signal reflects the relevant information of the second target frequency band signal; when the preset range is the third preset range, the envelope of the second output signal reflects the relevant information of the first target frequency band signal.

19. The harmonic information extraction circuit according to claim 1, wherein: The envelope extraction unit includes: a diode, wherein an anode of the diode is electrically connected to the amplitude adjustment module; a resistor electrically connected between the cathode of the diode and the ground terminal; and The capacitor is connected in parallel to both ends of the resistor.

20. The harmonic information extraction circuit according to claim 19, wherein: The envelope extraction unit further includes: A voltage follower, wherein the non-inverting input terminal of the voltage follower is electrically connected to the amplitude adjustment module, and the output terminal of the voltage follower is electrically connected to the anode of the diode.

21. The harmonic information extraction circuit according to claim 1, wherein: A charging and discharging time constant of the envelope extraction unit is greater than a time constant corresponding to a highest frequency of the first target frequency band signal and the second target frequency band signal.

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