Signal detection circuit, device and signal detection method

Abstract

The embodiment of the present application relates to a kind of signal detection circuit, the signal detection circuit includes: data processing module, data acquisition module and control module;The data processing module is connected AC signal input end, DC signal output end, the data acquisition module and the control module, wherein, the AC signal input end is used to provide signal to be detected;The data acquisition module is connected with the control module;The data processing module is used to: the output voltage of the DC signal output end is handled as the peak value of the AC voltage input in the AC signal input end;The data acquisition module is used to: collect the output voltage, and the output voltage is input to the control module;The control module is used to: based on the output voltage, the output voltage of the DC signal output end meets preset non-distortion condition, to improve the sensitivity of eddy current sensor.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of signal processing, and in particular to a signal detection circuit, device and signal detection method. BACKGROUND

[0002] In the prior art, when detecting the displacement of a bearing rotor by using an eddy current sensor, a plurality of pairs of eddy current sensors are generally used to detect the position of the surface of a metal rotor shaft. The detection method is as follows: after the detection values of each pair are differentially amplified, the detection values are compared with a given displacement value, and then the comparison result is sent to a suspension force control system to generate a suspension force control current.

[0003] However, in the prior art, because the distance between the detection surface and the two probes of the differential amplifier is not equal, in addition to the different resonant voltage values, the two resonant signals also have a phase difference. Therefore, the sensitivity of the eddy current sensor is low. SUMMARY

[0004] In view of this, in order to solve the above or part of the technical problems, embodiments of the present application provide a signal detection circuit, device and signal detection method.

[0005] In a first aspect, the embodiments of the present application provide a signal detection circuit, which comprises:

[0006] a data processing module, a data acquisition module and a control module;

[0007] The data processing module is connected with an alternating current (AC) signal input end, a direct current (DC) signal output end, the data acquisition module and the control module, wherein the AC signal input end is used to input the output voltage of an eddy current sensor.

[0008] The data acquisition module is connected with the control module.

[0009] The data processing module is configured to process the output voltage of the DC signal output end as the peak value of the AC voltage input to the AC signal input end.

[0010] The data acquisition module is configured to acquire the output voltage and input the output voltage to the control module.

[0011] The control module is configured to control the output voltage of the DC signal output end to satisfy a preset non-distortion condition based on the output voltage.

[0012] In a possible implementation, the data processing module comprises a programmable resistor configured to adjust the voltage frequency of the DC signal output end; and

[0013] The control module is configured to:

[0014] determine whether the output voltage of the direct current signal output terminal satisfies a preset non-distortion condition;

[0015] in a case where the output voltage does not satisfy the preset non-distortion condition, adjust the resistance value of the programmable resistance based on a voltage frequency of the direct current signal output terminal, so as to make the output voltage satisfy the preset non-distortion condition.

[0016] In one possible implementation, the control module is configured to:

[0017] in a case where the voltage frequency is less than the target frequency, increase the resistance value of the programmable resistance;

[0018] in a case where the voltage frequency is greater than the target frequency, decrease the resistance value of the programmable resistance.

[0019] In one possible implementation, the data processing module comprises a programmable resistance, a first comparator, a second comparator, a first diode, a second diode, a capacitor, a first resistance, and a second resistance.

[0020] one end of the first resistance is connected to the alternating current signal input terminal, and the other end is connected to a first end of the first comparator;

[0021] a second end of the first comparator is connected to one end of the second diode, and a third end is connected to the other end of the second diode;

[0022] one end of the second resistance is connected to the second end of the first comparator, and the other end is connected to a first end of the second comparator;

[0023] one end of the first diode is connected to the third end of the first comparator, and the other end is connected to a second end of the second comparator;

[0024] a third end of the second comparator is connected to the direct current signal output terminal;

[0025] one end of the programmable resistance is connected to the second end of the second comparator, and the other end is connected to a ground terminal;

[0026] one end of the capacitor is connected to the second end of the second comparator, and the other end is connected to the ground terminal.

[0027] In one possible implementation, the eddy current sensor comprises a bearing; and

[0028] the preset non-distortion condition comprises:

[0029] a difference between an operating frequency of the bearing and the voltage frequency of the direct current signal output terminal is less than or equal to a preset threshold.

[0030] In a second aspect, an embodiment of the present application provides a signal detection method of an eddy current sensor, the method comprising:

[0031] obtaining an output voltage of the eddy current sensor;

[0032] inputting the output voltage into a signal detection circuit to obtain an output voltage of the signal detection circuit, wherein the signal detection circuit is the signal detection circuit according to the first aspect;

[0033] controlling the output voltage of the signal detection circuit to meet a preset non-distortion condition based on the output voltage of the signal detection circuit.

[0034] In a possible implementation, the controlling the output voltage of the signal detection circuit to meet the preset non-distortion condition based on the output voltage of the signal detection circuit comprises:

[0035] determining whether the output voltage of the signal detection circuit meets the preset non-distortion condition;

[0036] in a case where the output voltage of the signal detection circuit does not meet the preset non-distortion condition, adjusting a resistance value of a programmable resistor included in the signal detection circuit based on a voltage frequency of the output voltage of the signal detection circuit, so as to make the output voltage meet the preset non-distortion condition.

[0037] In a possible implementation, the adjusting the resistance value of the programmable resistor included in the signal detection circuit based on the voltage frequency of the output voltage of the signal detection circuit comprises:

[0038] in a case where the voltage frequency is less than the target frequency, increasing the resistance value of the programmable resistor;

[0039] in a case where the voltage frequency is greater than the target frequency, decreasing the resistance value of the programmable resistor.

[0040] In a possible implementation, the preset non-distortion condition comprises:

[0041] a difference between an operating frequency of the bearing and the voltage frequency of the direct current signal output end is less than or equal to a preset threshold.

[0042] In a third aspect, an embodiment of the present application provides a signal detection device, the signal detection device comprising the signal detection circuit according to the first aspect.

[0043] The signal detection circuit provided by the embodiment of the present application comprises a data processing module, a data acquisition module and a control module; the data processing module is connected with an alternating current signal input end, a direct current signal output end, the data acquisition module and the control module, wherein the alternating current signal input end is used for inputting the output voltage of an eddy current sensor; the data acquisition module is connected with the control module; the data processing module is used for processing the output voltage of the direct current signal output end into the peak value of the alternating voltage input by the alternating current signal input end; the data acquisition module is used for acquiring the output voltage and inputting the output voltage to the control module; and the control module is used for controlling the output voltage of the direct current signal output end to meet a preset non-distortion condition based on the output voltage. Thus, by controlling the output voltage of the direct current signal output end to be non-distorted, the situation that the output voltage signal appears negative value when differential detection is caused by phase difference is eliminated, the timeliness of the output of the eddy current sensor is ensured, the output difference caused by the inconsistent distance between the sensor probe and the detection surface is reduced, and the sensitivity of the eddy current sensor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 The structural schematic diagram of the first signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0045] Figure 2 The structural schematic diagram of the second signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0046] Figure 3 The displacement signal differential detection measurement schematic diagram of the magnetic suspension bearing eddy current sensor provided by the embodiment of the present application is shown in the figure;

[0047] Figure 4 The waveform schematic diagram of the selected wave before the differential detection in the ideal case related to the signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0048] Figure 5 The waveform schematic diagram of the selected wave differential detection in the ideal case related to the signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0049] Figure 6 The waveform schematic diagram of the selected wave before the differential detection in the actual case related to the signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0050] Figure 7 The waveform schematic diagram of the selected wave differential detection in the actual case related to the signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0051] Figure 8 The waveform schematic diagram of the peak envelope detection differential detection related to the signal detection circuit provided by the embodiment of the present application is shown in the figure;

[0052] Figure 9The signal detection circuit provided by the embodiment of the present application relates to a sensor detection circuit parameter matching flowchart.

[0053] Figure 10 The flowchart of the signal detection method of the eddy current sensor provided by the embodiment of the present application is shown.

[0054] Figure 11 The structural diagram of the signal detection device provided by the embodiment of the present application is shown. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme of the embodiment of the present application will be described clearly and completely below with reference to the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiment of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0056] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme of the embodiment of the present application will be described clearly and completely below with reference to the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiment of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0057] Figure 1 The structural diagram of the first signal detection circuit provided by the embodiment of the present application is shown. The signal detection circuit specifically includes:

[0058] The data processing module 10, the data acquisition module 20 and the control module 30.

[0059] Further, the circuit structure inside the signal detection circuit includes:

[0060] The data processing module 10 is connected with the alternating current signal input end Uin, the direct current signal output end Uout, the data acquisition module 20 and the control module 30.

[0061] The alternating current signal input end Uin is used for inputting the output voltage of the eddy current sensor.

[0062] The data acquisition module 20 is connected with the control module 30.

[0063] The data processing module 10 is used for processing the output voltage of the direct current signal output end Uout as the peak value of the alternating voltage input by the alternating current signal input end Uin. That is, the voltage value of the output voltage of the direct current signal output end Uout is processed as the peak value of the alternating voltage input by the alternating current signal input end Uin.

[0064] The data collection module 20 is configured to collect the output voltage and input the output voltage to the control module 30.

[0065] The control module 30 is configured to control the output voltage of the DC signal output end Uout to meet a preset non-distortion condition based on the output voltage.

[0066] Here, the preset non-distortion condition can be a condition determined in advance for determining that the output voltage of the DC signal output end Uout is not distorted. For example, the preset non-distortion condition can include that the output voltage of the DC signal output end does not belong to a preset voltage interval.

[0067] The signal detection circuit provided by the embodiment of the application includes a data processing module, a data collection module and a control module. The data processing module is connected with an AC signal input end, a DC signal output end, the data collection module and the control module. The AC signal input end is configured to input an output voltage of an eddy current sensor. The data collection module is connected with the control module. The data processing module is configured to process the output voltage of the DC signal output end as a peak value of an AC voltage input to the AC signal input end. The data collection module is configured to collect the output voltage and input the output voltage to the control module. The control module is configured to control the output voltage of the DC signal output end to meet a preset non-distortion condition based on the output voltage. In this way, by controlling the output voltage of the DC signal output end to be not distorted, the situation that the output voltage signal appears to be negative when differential detection is caused by a phase difference is eliminated, the timeliness of the sensor output is ensured, the output difference caused by the inconsistent distance between the sensor probe and the detection surface is reduced, and the sensitivity of the eddy current sensor is improved.

[0068] Further, the data processing module 10 can make the DC voltage value of the DC signal output end Uout equal to the peak value of the AC signal input to the AC signal input end Uin. The data collection module 20 can collect the voltage value of the DC signal output end Uout and input the voltage value to the control module 30. The control module 30 can read the DC voltage value of the DC signal output end Uout through the data collection module 20, determine whether the output of the DC signal output end Uout is distorted, and if not, adjust the signal detection circuit according to the frequency of the DC voltage value output by the DC signal output end Uout, so as to automatically match the sensor and avoid changing the hardware circuit, thereby improving the applicability of the detection circuit.

[0069] In some optional implementation manners of the embodiment of the application, the data processing module 10 includes a programmable resistor R1 configured to adjust the voltage frequency of the DC signal output end Uout.

[0070] On this basis, the control module 30 can be configured to determine whether the output voltage of the direct current signal output terminal Uout meets a preset non-distortion condition. In a case where the output voltage does not meet the preset non-distortion condition, the resistance value of the programmable resistor R1 is adjusted based on the voltage frequency of the direct current signal output terminal Uout, so that the output voltage meets the preset non-distortion condition.

[0071] It can be understood that, in the optional implementation described above, the output voltage of the direct current signal output terminal can be prevented from being distorted by adjusting the resistance value of the programmable resistor R1, so that the sensor detection circuit can be more conveniently matched in parameters.

[0072] In some application scenarios of the optional implementation described above, the control module 30 is configured to increase the resistance value of the programmable resistor R1 in a case where the voltage frequency is less than the target frequency, and decrease the resistance value of the programmable resistor R1 in a case where the voltage frequency is greater than the target frequency.

[0073] The target frequency can be an expected voltage frequency of the direct current signal output terminal.

[0074] It can be understood that, for different bearing systems, the speed of bearing rotation is also different, and the speed of bearing rotation is inversely proportional to the charge-discharge time constant (R1xC1) of the capacitor resistance. In order to ensure that the signal of the detection direct current signal output terminal is not distorted, in the application scenario described above, the voltage frequency of the direct current signal output terminal is compared with the target frequency, and the comparison result is used as an adjustment basis, so that the applicability of the signal detection circuit can be further improved.

[0075] In some optional implementations of the embodiment, the data processing module 10 includes a programmable resistor R1, a first comparator U1, a second comparator U2, a first diode D1, a second diode D2, a capacitor C1, a first resistor R2, and a second resistor R3.

[0076] Further, one end of the first resistor R2 is connected to the alternating current signal input terminal Uin, and the other end is connected to the first end of the first comparator U1.

[0077] The second end of the first comparator U1 is connected to one end of the second diode D2, and the third end is connected to the other end of the second diode D2.

[0078] One end of the second resistor R3 is connected to the second end of the first comparator U1, and the other end is connected to the first end of the second comparator U2.

[0079] One end of the first diode is connected to the third end of the first comparator U1, and the other end is connected to the second end of the second comparator U2.

[0080] The third end of the second comparator U2 is connected to the direct current signal output end Uout.

[0081] One end of the programmable resistor R1 is connected to the second end of the second comparator U2, and the other end is connected to the ground end.

[0082] One end of the capacitor C1 is connected to the second end of the second comparator U2, and the other end is connected to the ground end.

[0083] In some optional implementations of the embodiment, the eddy current sensor comprises a bearing.

[0084] On this basis, the preset non-distortion condition comprises that the difference between the running frequency of the bearing and the voltage frequency of the direct current signal output end Uout is less than or equal to a preset threshold.

[0085] Further, the preset non-distortion condition can specifically comprise that the running frequency of the bearing is equal to the voltage frequency of the direct current signal output end Uout.

[0086] It can be understood that in the above optional implementation, the output voltage of the direct current signal output end can be judged by the running frequency of the bearing and the voltage frequency of the direct current signal output end Uout.

[0087] It should be noted that the internal mechanism of the signal detection circuit can comprise or only comprise at least one of the above optional implementations, and the embodiment is not specifically limited.

[0088] Figure 2 The second signal detection circuit provided by the embodiment of the application is shown in the structure diagram. The signal detection circuit comprises a data processing module 10, a data acquisition module 20 and a control module 30.

[0089] Specifically, the data processing module 10 is connected to an alternating current signal input end Uin, a direct current signal output end Uout, the data acquisition module 20 and the control module 30, wherein the alternating current signal input end Uin is used for inputting the output voltage of the eddy current sensor.

[0090] The data acquisition module 20 is connected to the control module 30.

[0091] The data processing module 10 is used for processing the output voltage of the direct current signal output end Uout as the peak value of the alternating voltage input by the alternating current signal input end Uin.

[0092] The data acquisition module 20 is used for acquiring the output voltage and inputting the output voltage to the control module 30.

[0093] The control module 30 is configured to control the output voltage of the DC signal output terminal Uout to meet a preset non-distortion condition based on the output voltage.

[0094] The data processing module 10 comprises a programmable resistor R1 configured to adjust the voltage frequency of the DC signal output terminal Uout.

[0095] The control module 30 is configured to determine whether the output voltage of the DC signal output terminal Uout meets a preset non-distortion condition, and adjust the resistance value of the programmable resistor R1 based on the voltage frequency of the DC signal output terminal Uout to make the output voltage meet the preset non-distortion condition when the output voltage does not meet the preset non-distortion condition.

[0096] The control module 30 is configured to determine whether the voltage frequency of the DC signal output terminal Uout is greater than or equal to a target frequency, increase the resistance value of the programmable resistor R1 when the voltage frequency is greater than or equal to the target frequency, and decrease the resistance value of the programmable resistor R1 when the voltage frequency is less than the target frequency.

[0097] The data processing module 10 comprises a programmable resistor R1, a first comparator U1, a second comparator U2, a first diode D1, a second diode D2, a capacitor C1, a first resistor R2, and a second resistor R3.

[0098] One end of the first resistor R2 is connected to the AC signal input terminal Uin, and the other end is connected to a first end of the first comparator U1.

[0099] A second end of the first comparator U1 is connected to one end of the second diode D2, and a third end is connected to the other end of the second diode D2.

[0100] One end of the second resistor R3 is connected to the second end of the first comparator U1, and the other end is connected to a first end of the second comparator U2.

[0101] One end of the first diode is connected to the third end of the first comparator U1, and the other end is connected to a second end of the second comparator U2.

[0102] A third end of the second comparator U2 is connected to the DC signal output terminal Uout.

[0103] One end of the programmable resistor R1 is connected to the second end of the second comparator U2, and the other end is connected to a ground terminal.

[0104] One end of the capacitor C1 is connected to the second end of the second comparator U2, and the other end is connected to a ground terminal.

[0105] The eddy current sensor comprises a bearing. The preset non-distortion condition comprises that a difference between an operating frequency of the bearing and a voltage frequency of the direct current signal output end Uout is less than or equal to a preset threshold.

[0106] The embodiments of the present application are exemplarily described below, but it should be noted that the embodiments of the present application can have the features described below, but the following description does not constitute a limitation on the protection scope of the embodiments of the present application.

[0107] In the conventional non-contact eddy current sensor displacement measurement method, there is usually a phase difference problem, which leads to poor sensitivity of the eddy current sensor. For example, in the ideal case of using the conventional displacement measurement method, as shown in Figure 4 、 Figure 5 The voltage signal is processed by a wave selection differential circuit, an amplification and filtering circuit, and then input into a control chip (such as a DSP (Digital Signal Processing)) to calculate the corresponding position of the bearing. The differential voltage signal does not contain negative signals, and the amplitude of the direct current voltage signal output after filtering is high, so the sensitivity of the eddy current sensor is also high. However, since the distance between the detection surface of the bearing and the two probes of the differential circuit cannot be completely equal, as shown in Figure 6 , it will not only cause different resonance voltage peaks, but also cause a phase difference between the two resonance signals. Thus, when the conventional wave detection method is used for signal differential detection, the voltage signal appears negative, which weakens the peak voltage of the wave detection and reduces the sensitivity of the sensor. The corresponding waveform is shown in Figure 7 .

[0108] In order to solve the problem of poor sensitivity of the eddy current sensor, an improved sensor displacement signal detection device can be used, as shown in Figure 3 . The specific improved wave detection method is shown in Figure 2 . The front-end operational amplifier of the improved peak envelope detection circuit cannot form a negative feedback, and is a comparator. As long as Uin is greater than Uout, a voltage close to the positive power rail will be output, and when Uin is less than Uout, a voltage close to the negative power rail will be output. In this way, the voltage at the anode of the first diode D1 will be relatively large, thereby speeding up the charging speed of the capacitor. The preamplifier can be an LC (inductor-capacitor) parallel resonance circuit, and the probe in the figure corresponds to the inductor in the resonance circuit.

[0109] The detection process is as follows: start Uin slowly increases, Uin greater than Uout comparator output positive power supply voltage, the second diode D2 cut-off, the first diode D1 conduction, the capacitor C1 quickly start charging. Because the capacitor charging voltage is Uout, when the charging voltage is greater than Uin, the comparator will output negative power supply voltage, the first diode D1 cut-off, the second diode D2 conduction, the capacitor through the resistor R1 slowly discharge. Capacitor discharge to less than Uin, and the first diode D1 again conduction. Repeat this process until the capacitor to the peak around. Because the capacitor charging speed is much greater than the discharge speed, so overall, the voltage across the capacitor will rise. Waveform as Figure 8 The figure shows. As can be seen from the figure, the amplitude of the output DC signal Uout is the peak value of the input AC signal Uin.

[0110] The above, has solved the sensor displacement signal exists phase difference, low sensitivity problem. However, for different bearing system, the speed of bearing rotation is also different, the speed of bearing rotation and the charge-discharge time constant of the capacitor resistance (R1xC1) is inversely proportional. In order to ensure that the Uout signal after detection output is not distorted, it is necessary to adjust the charge-discharge time constant (R1) according to different bearing rotation speed. For this purpose, the sampling reading of pulsed DC signal Uout and the software control part of programmable resistance R1 can be increased. Flow chart as Figure 9 The figure shows, first make the sensor signal Uin for the average value, MCU (Microcontroller Unit, micro control unit) control given initial R1 value (for example, 10kΩ), then MCU through the ADC (analog to digital converter, analog to digital converter) signal acquisition reading Uout value, judge Uout output is distorted, if not satisfied, according to the needs of Uout frequency adjustment programmable resistance R1 resistance, until the desired Uout, so as to realize the use of software for automatic sensor matching, avoid to change the hardware circuit, improve the adaptability of the detection circuit.

[0111] Therefore, the bearing displacement measurement method based on the peak envelope detection can be used not only in the magnetic suspension bearing system, but also in other application occasions of the eddy current sensor. The sensitivity of the eddy current sensor is improved.

[0112] Figure 10 A flowchart of a signal detection method of an eddy current sensor according to an embodiment of the present application is shown in FIG. 1.

[0113] As shown in Figure 10 , the method specifically comprises the following steps.

[0114] In step 101, an output voltage of the eddy current sensor is obtained.

[0115] In step 102, the output voltage is input to a signal detection circuit to obtain an output voltage of the signal detection circuit. Figure 1 or Figure 2 the signal detection circuit.

[0116] In step 103, based on the output voltage of the signal detection circuit, the output voltage of the signal detection circuit is controlled to meet a preset non-distortion condition.

[0117] It should be noted that, in addition to the above-mentioned content, the present embodiment can also include Figures 1-9 corresponding descriptions of the corresponding technical features, thereby achieving Figures 1-9 the technical effects described above, and specific reference is made to the above related descriptions for brevity.

[0118] The signal detection method of the eddy current sensor provided by the present application can reduce the output difference caused by the inconsistent distance between the sensor probe and the detection surface, and improve the sensitivity of the eddy current sensor.

[0119] Figure 11A structural schematic diagram of a signal detection device provided by an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the signal detection device 1000 comprises: Figure 11

[0120] a signal detection circuit 100;

[0121] The signal detection circuit can be the signal detection circuit shown in FIG. 2 or FIG. 3. Figure 1 Figure 2 Figures 1-9

[0122] The signal detection device according to the embodiment of the present application adopts the signal detection circuit in the above embodiment, which can reduce the output difference caused by the inconsistent distance between the sensor probe and the detection surface, and improve the sensitivity of the eddy current sensor.

[0123] Those skilled in the art should further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in general terms in the above description. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0124] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented by hardware, software modules executed by a processor, or a combination of both. The software modules can be stored in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0125] The above detailed description of the specific embodiments of the present application further illustrates the purposes, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.​​​

Claims

1. A signal detection circuit, characterized by, The signal detection circuit comprises: The data processing module, the data acquisition module and the control module; The data processing module is connected with the AC signal input end, the DC signal output end, the data acquisition module and the control module, wherein the AC signal input end is used for inputting the output voltage of the eddy current sensor; The data acquisition module is connected with the control module; The data processing module is used for processing the output voltage of the DC signal output end into the peak value of the AC voltage input into the AC signal input end; The data acquisition module is used for acquiring the output voltage of the DC signal output end and inputting the output voltage of the DC signal output end into the control module; The data processing module comprises a programmable resistor, which is used for adjusting the voltage frequency of the DC signal output end; and The control module is used for: determining whether the output voltage of the DC signal output end meets a preset non-distortion condition; in the case that the output voltage does not meet the preset non-distortion condition, adjusting the resistance value of the programmable resistor based on the voltage frequency of the DC signal output end, so that the output voltage meets the preset non-distortion condition; The eddy current sensor comprises a bearing; and The preset non-distortion condition comprises: the difference between the running frequency of the bearing and the voltage frequency of the DC signal output end is less than or equal to a preset threshold.

2. The signal detection circuit of claim 1, wherein The control module is used for: in the case that the voltage frequency is less than a target frequency, increasing the resistance value of the programmable resistor; in the case that the voltage frequency is greater than the target frequency, decreasing the resistance value of the programmable resistor.

3. The signal detection circuit according to one of claims 1-2, characterized in that, The data processing module comprises a programmable resistor, a first comparator, a second comparator, a first diode, a second diode, a capacitor, a first resistor and a second resistor; One end of the first resistor is connected with the AC signal input end, and the other end is connected with the first end of the first comparator; The second end of the first comparator is connected with one end of the second diode, and the third end is connected with the other end of the second diode; One end of the second resistor is connected with the second end of the first comparator, and the other end is connected with the first end of the second comparator; One end of the first diode is connected with the third end of the first comparator, and the other end is connected with the second end of the second comparator; The third end of the second comparator is connected with the DC signal output end; One end of the programmable resistor is connected with the second end of the second comparator, and the other end is connected with the ground end; One end of the capacitor is connected with the second end of the second comparator, and the other end is connected with the ground end.

4. A method of signal detection of an eddy current sensor, characterized by, The method comprises: acquiring the output voltage of the eddy current sensor; inputting the output voltage into a signal detection circuit to obtain the output voltage of the signal detection circuit, wherein the signal detection circuit is the signal detection circuit according to any one of claims 1-3; controlling the output voltage of the signal detection circuit to meet a preset non-distortion condition based on the output voltage of the signal detection circuit.

5. The method of claim 4, wherein, The controlling the output voltage of the signal detection circuit to meet a preset non-distortion condition based on the output voltage of the signal detection circuit comprises: determining whether an output voltage of the signal detection circuit satisfies a preset non-distortion condition; in a case where the output voltage of the signal detection circuit does not satisfy the preset non-distortion condition, adjusting a resistance value of a programmable resistance included in the signal detection circuit based on a voltage frequency of the output voltage of the signal detection circuit, so as to make the output voltage satisfy the preset non-distortion condition.

6. The method of claim 5, wherein, The adjusting the resistance value of the programmable resistance included in the signal detection circuit based on the voltage frequency of the output voltage of the signal detection circuit comprises: in a case where the voltage frequency is less than a target frequency, increasing the resistance value of the programmable resistance; in a case where the voltage frequency is greater than the target frequency, decreasing the resistance value of the programmable resistance.

7. The method according to one of claims 4-6, characterized in that, The preset non-distortion condition comprises: a difference between an operating frequency of a bearing and the voltage frequency of the direct current signal output end is less than or equal to a preset threshold value.

8. A signal detection device, characterized by The signal detection device comprises the signal detection circuit according to any one of claims 1-3.

Images