Digital signal acquisition circuit and digital signal acquisition equipment

Abstract

The utility model relates to the technical field of digital signal acquisition, and discloses a digital signal acquisition circuit and digital signal acquisition equipment, which comprise a voltage dividing module, a signal filtering module and a sampling module. And the voltage dividing module is electrically connected with the signal filtering module and is used for carrying out voltage dividing processing on the original input signal to obtain a target input signal. Wherein the voltage of the target input signal is lower than that of the original input signal. And the signal filtering module is electrically connected with the sampling module and is used for filtering the target input signal according to a preset voltage threshold range to obtain a target output signal. The sampling module is used for sampling the target output signal to obtain a target digital signal. In the application, the target input signal is filtered through the voltage threshold range, interference signals can be effectively filtered out, and the accuracy of digital signal acquisition is improved.

Description

Technical Field

[0001] The present application relates to the technical field of digital signal acquisition, and in particular to a digital signal acquisition circuit and a digital signal acquisition device. Background Art

[0002] Digital signal acquisition is the process of converting analog signals into digital signals so that they can be processed and analyzed by computers or other digital devices. During digital signal acquisition, signal interference is prone to occur, which can cause signal levels to fluctuate. Failure to filter out interfering signals can result in inaccurate digital signals. Therefore, improving the accuracy of digital signal acquisition has become a pressing technical challenge. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a digital signal acquisition circuit and a digital signal acquisition device, which improve the accuracy of digital signal acquisition.

[0004] In a first aspect, the present application proposes a digital signal acquisition circuit, which includes a voltage divider module, a signal filtering module, and a sampling module;

[0005] The voltage dividing module is electrically connected to the signal filtering module, and is used to perform voltage dividing processing on the original input signal to obtain a target input signal; wherein the voltage of the target input signal is lower than that of the original input signal;

[0006] The signal filtering module is electrically connected to the sampling module, and is used to filter the target input signal according to a preset voltage threshold range to obtain a target output signal;

[0007] The sampling module is used to perform sampling processing on the target output signal to obtain a target digital signal.

[0008] In some embodiments, the digital signal acquisition circuit further includes a controller and a threshold generation module;

[0009] The controller is electrically connected to the first end of the threshold generation module, and the second end of the threshold generation module is electrically connected to the signal filtering module. The controller is used to preset a voltage threshold range, and the threshold generation module is used to generate a first voltage threshold signal and a second voltage threshold signal according to the preset voltage threshold range; the first voltage threshold signal is the upper limit value of the voltage threshold range, and the second voltage threshold signal is the lower limit value of the voltage threshold range.

[0010] In some embodiments, the signal filtering module includes a first comparator and a second comparator;

[0011] The threshold generation module is electrically connected to the inverting input terminal of the first comparator, and generates the first voltage threshold signal and inputs it to the inverting input terminal of the first comparator; the voltage divider module is electrically connected to the non-inverting input terminal of the first comparator, and inputs the target input signal to the non-inverting input terminal of the first comparator;

[0012] The threshold generation module is electrically connected to the non-inverting input terminal of the second comparator, and generates the second voltage threshold signal and inputs it to the non-inverting input terminal of the second comparator; the voltage divider module is electrically connected to the inverting input terminal of the second comparator, and inputs the target input signal to the inverting input terminal of the second comparator;

[0013] If the target input signal is less than or equal to the second voltage threshold signal, the first comparator outputs a low-level signal, the second comparator outputs a high-level signal, and the sampling module outputs a low-level signal; if the target input signal is greater than or equal to the first voltage threshold signal, the first comparator outputs a high-level signal, the second comparator outputs a low-level signal, and the sampling module outputs a low-level signal; if the target input signal is greater than the second voltage threshold signal and less than the first voltage threshold signal, the output signal of the sampling module remains unchanged.

[0014] In some embodiments, the threshold generation module includes a first threshold generation unit and a second threshold generation unit;

[0015] The controller is electrically connected to a first terminal of the first threshold generating unit and a first terminal of the second threshold generating unit, a second terminal of the first threshold generating unit is electrically connected to an inverting input terminal of the first comparator, and a second terminal of the second threshold generating unit is electrically connected to a non-inverting input terminal of the second comparator;

[0016] The controller is configured to control the first threshold generating unit to generate the first voltage threshold signal, and control the second threshold generating unit to generate the second voltage threshold signal.

[0017] In some embodiments, the threshold generation module includes a filtering unit;

[0018] The controller is electrically connected to the first end of the filtering unit, and the second end of the filtering unit is electrically connected to the inverting input end of the first comparator and the non-inverting input end of the second comparator respectively. The controller is used to generate a first square wave signal and a second square wave signal. The filtering unit is used to filter the first square wave signal into a first voltage threshold signal, and the filtering unit is used to filter the second square wave signal into a second voltage threshold signal.

[0019] In some embodiments, the filtering unit includes a first filtering subunit and a second filtering subunit;

[0020] The controller is electrically connected to a first terminal of the first filtering subunit and a first terminal of the second filtering subunit, a second terminal of the first filtering subunit is electrically connected to an inverting input terminal of the first comparator, and a second terminal of the second filtering subunit is electrically connected to a non-inverting input terminal of the second comparator;

[0021] The first filtering subunit is used to filter the first square wave signal into the first voltage threshold signal, and the second filtering subunit is used to filter the second square wave signal into the second voltage threshold signal.

[0022] In some embodiments, the voltage division module includes a voltage division unit and a frequency compensation unit;

[0023] The voltage dividing unit is electrically connected to the frequency compensation unit, and the frequency compensation unit is electrically connected to the non-inverting input terminal of the first comparator and the inverting input terminal of the second comparator respectively. The voltage dividing unit is used to perform voltage division processing on the original input signal to obtain the target input signal;

[0024] The frequency compensation unit is used to eliminate the influence of the voltage divider unit on the frequency of the original input signal.

[0025] In some embodiments, the voltage dividing unit includes a first resistor and a second resistor;

[0026] The second end of the first resistor is electrically connected to the first end of the second resistor, the non-inverting input end of the first comparator and the inverting input end of the second comparator, and the second end of the second resistor is grounded;

[0027] The first end of the first resistor is used to collect the original input signal. The original input signal is divided by the first resistor and the second resistor to obtain the target input signal.

[0028] In some embodiments, the frequency compensation unit includes a first capacitor and a second capacitor;

[0029] A first end of the first capacitor is electrically connected to a first end of the first resistor, a second end of the first capacitor is electrically connected to a first end of the second resistor, a first end of the second capacitor, a non-inverting input end of the first comparator, and an inverting input end of the second comparator, and a second end of the second capacitor is grounded; wherein the resistance value of the first resistor is a first resistance value, the resistance value of the second resistor is a second resistance value, the capacitance value of the first capacitor is a first capacitance value, and the capacitance value of the second capacitor is a second capacitance value;

[0030] The product of the first resistance value and the first capacitance value is a first product, the product of the second resistance value and the second capacitance value is a second product, and the first product and the second product are equal.

[0031] In a second aspect, an embodiment of the present application provides a digital signal acquisition device, comprising the digital signal acquisition circuit as described in the first aspect.

[0032] The digital signal acquisition circuit proposed in the embodiment of the present application includes a voltage divider module, a signal filtering module and a sampling module. The voltage divider module is electrically connected to the signal filtering module, and the voltage divider module is used to perform voltage division processing on the original input signal to obtain a target input signal. Among them, the voltage of the target input signal is lower than the original input signal. The signal filtering module is electrically connected to the sampling module, and the signal filtering module is used to filter the target input signal according to a preset voltage threshold range to obtain a target output signal. The sampling module is used to sample the target output signal to obtain a target digital signal. In the present application, filtering the target input signal through the voltage threshold range can effectively filter out interference signals and improve the accuracy of digital signal acquisition.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0035] Figure 1 Schematic diagram of a digital signal acquisition circuit provided by the first embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of a digital signal acquisition circuit provided by the second embodiment of the present application;

[0037] Figure 3 1 is a circuit connection diagram of the signal filtering module provided in an embodiment of the present application;

[0038] Figure 4 Schematic diagram of the circuit connection of the threshold value generation module provided in the embodiment of the present application;

[0039] Figure 5 This is a first circuit connection diagram of the filter unit provided in an embodiment of the present application;

[0040] Figure 6 This is a second circuit connection diagram of the filter unit provided in an embodiment of the present application;

[0041] Figure 7 This is a first circuit connection diagram of the voltage divider module provided in an embodiment of the present application;

[0042] Figure 8 This is a second circuit connection diagram of the voltage divider module provided in an embodiment of the present application; DETAILED DESCRIPTION

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0045] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0048] Digital signal acquisition is the process of converting analog signals into digital signals so that they can be processed and analyzed by computers or other digital devices. During digital signal acquisition, signal interference is prone to occur, which can cause the signal level to vary. Failure to filter out interfering signals can result in inaccurate digital signals.

[0049] Based on this, an embodiment of the present application provides a digital signal acquisition circuit, which is applied to a digital signal acquisition device and is specifically described in the following embodiments.

[0050] Figure 1 This is a schematic diagram of a digital signal acquisition circuit provided by the first embodiment of the present application, such as Figure 1 As shown, the digital signal acquisition circuit provided in the embodiment of the present application includes a voltage divider module 10 , a signal filtering module 11 and a sampling module 12 .

[0051] The voltage divider module 10 is electrically connected to the signal filtering module 11 and is used to divide the original input signal DI to obtain a target input signal. The voltage divider module 10 attenuates the external high-voltage signal (original input signal) into a low-voltage signal (target input signal) so that the target input signal is within the voltage range processed by the signal filtering module 11.

[0052] The signal filtering module 11 is electrically connected to the sampling module 12. The signal filtering module 11 is used to filter the target input signal according to a preset voltage threshold range to obtain a target output signal. For example, when the target input signal is 0-5V, the voltage threshold range can be 1-3V. The signal filtering module 11 filters the target input signal below 1V, and the sampling module 12 performs sampling processing and outputs a low-level signal 0V. The signal filtering module 11 also filters the target input signal above 3V, and the sampling module 12 performs sampling processing and outputs a high-level signal 5V. The signal filtering module 11 also filters the target input signal between 1-3V, and the sampling module 12 maintains the previous output unchanged, thereby sampling the 0-5V analog signal into a digital signal of 0V and 5V.

[0053] It should be noted that in the related art, when the target input signal is 0-5V, 2.5V is generally used as the threshold value. When the target input signal is lower than 2.5V, a low level is output. When the target input signal is higher than 2.5V, a high level is output. However, during the process of digital signal acquisition, if signal interference occurs, the level of the target input signal will change. When the target input signal is actually 2.4V, it will become 2.6V due to signal interference, thereby outputting a high level, making the collected signal inaccurate. In this embodiment, the target input signal is compared with the voltage threshold range. When the target input signal is actually 2.4V and becomes 2.6V due to signal interference, since 2.6V is between 1-3V, the low level output previously will remain unchanged. That is, when signal interference occurs, this embodiment can also effectively filter out the interference signal, thereby collecting an accurate digital signal.

[0054] The digital signal acquisition circuit proposed in the embodiment of the present application includes a voltage divider module 10, a signal filtering module 11 and a sampling module 12. The voltage divider module 10 is electrically connected to the signal filtering module 11, and the voltage divider module 10 is used to perform voltage division processing on the original input signal to obtain a target input signal. Among them, the voltage of the target input signal is lower than the original input signal. The signal filtering module 11 is electrically connected to the sampling module 12, and the signal filtering module 11 is used to filter the target input signal according to a preset voltage threshold range to obtain a target output signal. The sampling module 12 is used to sample the target output signal to obtain a target digital signal. In the present application, filtering the target input signal through the voltage threshold range can effectively filter out interference signals and improve the accuracy of digital signal acquisition.

[0055] In some embodiments, as Figure 2 As shown, the digital signal acquisition circuit also includes a controller 21 and a threshold generation module 22. The controller 21 is electrically connected to the first end of the threshold generation module 22, and the second end of the threshold generation module 22 is electrically connected to the signal filtering module 11. The controller 21 is used to preset the voltage threshold range, and the threshold generation module 22 is used to generate a first voltage threshold signal and a second voltage threshold signal according to the preset voltage threshold range. The first voltage threshold signal is the upper limit value of the voltage threshold range, and the second voltage threshold signal is the lower limit value of the voltage threshold range. In this embodiment, since the original input signal is not fixed, when the voltage range of the original input signal changes, the voltage threshold range must also be adjusted accordingly. Therefore, the voltage threshold range is preset by the controller 21, and the threshold generation module 22 generates the first voltage threshold signal and the second voltage threshold signal. Through this embodiment, original input signals with different voltage ranges can be adapted.

[0056] In some embodiments, as Figure 3As shown, the signal filtering module 11 includes a first comparator 110 and a second comparator 111. The threshold generating module 22 is electrically connected to the inverting input terminal of the first comparator 110 and generates a first voltage threshold signal which is input to the inverting input terminal of the first comparator 110. The voltage dividing module 10 is electrically connected to the non-inverting input terminal of the first comparator 110 and inputs the target input signal to the non-inverting input terminal of the first comparator 110.

[0057] The threshold generation module 22 is electrically connected to the non-inverting input terminal of the second comparator 111, and generates a second voltage threshold signal and inputs it to the non-inverting input terminal of the second comparator 111. The voltage divider module 10 is electrically connected to the inverting input terminal of the second comparator 111, and inputs the target input signal to the inverting input terminal of the second comparator 111.

[0058] If the target input signal is less than or equal to the second voltage threshold signal V Hi , the first comparator 110 outputs a low level signal, the second comparator 111 outputs a high level signal, and the sampling module 12 outputs a low level signal. If the target input signal is greater than or equal to the first voltage threshold signal V LO , the first comparator 110 outputs a high level signal, the second comparator 111 outputs a low level signal, and the sampling module 12 outputs a low level signal. If the target input signal is greater than the second voltage threshold signal V Hi and is less than the first voltage threshold signal V LO , the output signal of the sampling module 12 remains unchanged.

[0059] Specifically, the target input signal is a sine wave signal. When the target input signal changes from 0-V max When the input is rising: the target input signal is less than or equal to V LO When the target input signal is greater than V LO and is less than V Hi When the target input signal is greater than or equal to V Hi When , the sampling module 12 outputs a high level signal.

[0060] When the target input signal is from V max -0 Falling edge input: The target input signal is greater than or equal to V Hi When the target input signal is greater than V LO and is less than V Hi When the target input signal is less than or equal to V LO When , the sampling module 12 outputs a low level signal.

[0061] In one example, the sampling chip of the sampling module 12 may be an FPGA chip or a CPLD chip, and the first comparator 110 and the second comparator 111 may both be TLV3502.

[0062] According to this embodiment, the sampling module 12 can realize the window comparison function by judging the target input signal, which can effectively eliminate the first voltage threshold signal V LO and the second voltage threshold signal V Hi The interference between them can be reduced to achieve stable signal acquisition.

[0063] In some embodiments, as Figure 4 As shown, the threshold generation module 22 includes a first threshold generation unit 220 and a second threshold generation unit 221. The controller 21 is electrically connected to a first terminal of the first threshold generation unit 220 and a first terminal of the second threshold generation unit 221. The second terminal of the first threshold generation unit 220 is electrically connected to the inverting input terminal of the first comparator 110, and the second terminal of the second threshold generation unit 221 is electrically connected to the non-inverting input terminal of the second comparator 111.

[0064] The controller 21 is configured to control the first threshold generating unit 220 to generate a first voltage threshold signal, and control the second threshold generating unit 221 to generate a second voltage threshold signal.

[0065] Specifically, the first threshold generating unit 220 may be a first digital-to-analog converter, and the second threshold generating unit 221 may be a second digital-to-analog converter. The models of both the first digital-to-analog converter and the second digital-to-analog converter are DAC53608.

[0066] In some embodiments, the first voltage threshold signal and the second voltage threshold signal may be obtained by other means. Figure 5 As shown, the threshold generation module 22 includes a filtering unit 222. The controller 21 is electrically connected to a first terminal of the filtering unit 222. The second terminal of the filtering unit 222 is electrically connected to the inverting input terminal of the first comparator 110 and the non-inverting input terminal of the second comparator 111, respectively. The controller 21 is used to generate a first square wave signal and a second square wave signal. The filtering unit 222 is used to filter the first square wave signal into a first voltage threshold signal, and the filtering unit 222 is used to filter the second square wave signal into a second voltage threshold signal. The controller 21 adjusts the magnitude of the first voltage threshold signal by adjusting the duty cycle of the first square wave signal, and adjusts the magnitude of the second voltage threshold signal by adjusting the duty cycle of the second square wave signal.

[0067] Specifically, such as Figure 6As shown, the filtering unit 222 includes a first filtering subunit 61 and a second filtering subunit 62. The controller 21 is electrically connected to a first terminal of the first filtering subunit 61 and a first terminal of the second filtering subunit 62. The second terminal of the first filtering subunit 61 is electrically connected to the inverting input terminal of the first comparator 110, and the second terminal of the second filtering subunit 62 is electrically connected to the non-inverting input terminal of the second comparator 111.

[0068] The first filtering subunit 61 is used to filter the first square wave signal into a first voltage threshold signal, and the second filtering subunit 62 is used to filter the second square wave signal into a second voltage threshold signal.

[0069] In some embodiments, as Figure 7 As shown, the voltage divider module 10 includes a voltage divider unit 101 and a frequency compensation unit 102. The voltage divider unit 101 is electrically connected to the frequency compensation unit 102, and the frequency compensation unit 102 is electrically connected to the non-inverting input terminal of the first comparator 110 and the inverting input terminal of the second comparator 111 respectively. The voltage divider unit 101 is used to divide the original input signal to obtain a target input signal, and the frequency compensation unit 102 is used to eliminate the influence of the voltage divider unit 101 on the frequency of the original input signal.

[0070] Specifically, such as Figure 8 As shown, the voltage divider unit 101 includes a first resistor R1 and a second resistor R2, the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, the non-inverting input end of the first comparator 110 and the inverting input end of the second comparator 111, and the second end of the second resistor R2 is grounded.

[0071] The first end of the first resistor R1 is used to collect an original input signal. The original input signal is divided by the first resistor R1 and the second resistor R2 to obtain a target input signal.

[0072] The frequency compensation unit 102 includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is electrically connected to the first end of the first resistor R1, the second end of the first capacitor C1 is electrically connected to the first end of the second resistor R2, the first end of the second capacitor C2, the non-inverting input of the first comparator 110, and the inverting input of the second comparator 111, and the second end of the second capacitor C2 is grounded. The resistance value of the first resistor R1 is a first resistance value, the resistance value of the second resistor R2 is a second resistance value, the capacitance value of the first capacitor C1 is a first capacitance value, and the capacitance value of the second capacitor C2 is a second capacitance value.

[0073] The product of the first resistance value and the first capacitance value is the first product, and the product of the second resistance value and the second capacitance value is the second product. By making the first product and the second product equal, it can be ensured that the voltage divider unit 101 is independent of the frequency of the original input signal and will not affect the result after the voltage division of the original input signal.

[0074] In this embodiment, by adjusting the values ​​of the voltage divider resistor and the compensation capacitor, the influence of the voltage divider unit 101 on the original input signal frequency can be effectively eliminated, thereby achieving the characteristic that the voltage divider unit 101 is independent of the original input signal frequency.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A digital signal acquisition circuit, characterized in that: The digital signal acquisition circuit includes a voltage divider module, a signal filtering module and a sampling module; The voltage dividing module is electrically connected to the signal filtering module, and is used to perform voltage dividing processing on the original input signal to obtain a target input signal; wherein the voltage of the target input signal is lower than that of the original input signal; The signal filtering module is electrically connected to the sampling module, and is used to filter the target input signal according to a preset voltage threshold range to obtain a target output signal; The sampling module is used to perform sampling processing on the target output signal to obtain a target digital signal.

2. The digital signal acquisition circuit according to claim 1, characterized in that: The digital signal acquisition circuit also includes a controller and a threshold generation module; The controller is electrically connected to the first end of the threshold generation module, and the second end of the threshold generation module is electrically connected to the signal filtering module. The controller is used to preset a voltage threshold range, and the threshold generation module is used to generate a first voltage threshold signal and a second voltage threshold signal according to the preset voltage threshold range; the first voltage threshold signal is the upper limit value of the voltage threshold range, and the second voltage threshold signal is the lower limit value of the voltage threshold range.

3. The digital signal acquisition circuit according to claim 2, characterized in that: The signal filtering module includes a first comparator and a second comparator; The threshold generation module is electrically connected to the inverting input terminal of the first comparator, and generates the first voltage threshold signal and inputs it to the inverting input terminal of the first comparator; the voltage divider module is electrically connected to the non-inverting input terminal of the first comparator, and inputs the target input signal to the non-inverting input terminal of the first comparator; The threshold generation module is electrically connected to the non-inverting input terminal of the second comparator, and generates the second voltage threshold signal and inputs it to the non-inverting input terminal of the second comparator; the voltage divider module is electrically connected to the inverting input terminal of the second comparator, and inputs the target input signal to the inverting input terminal of the second comparator; If the target input signal is less than or equal to the second voltage threshold signal, the first comparator outputs a low-level signal, the second comparator outputs a high-level signal, and the sampling module outputs a low-level signal; if the target input signal is greater than or equal to the first voltage threshold signal, the first comparator outputs a high-level signal, the second comparator outputs a low-level signal, and the sampling module outputs a low-level signal; if the target input signal is greater than the second voltage threshold signal and less than the first voltage threshold signal, the output signal of the sampling module remains unchanged.

4. The digital signal acquisition circuit according to claim 3, characterized in that: The threshold generation module includes a first threshold generation unit and a second threshold generation unit; The controller is electrically connected to a first terminal of the first threshold generating unit and a first terminal of the second threshold generating unit, a second terminal of the first threshold generating unit is electrically connected to an inverting input terminal of the first comparator, and a second terminal of the second threshold generating unit is electrically connected to a non-inverting input terminal of the second comparator; The controller is configured to control the first threshold generating unit to generate the first voltage threshold signal, and control the second threshold generating unit to generate the second voltage threshold signal.

5. The digital signal acquisition circuit according to claim 3, characterized in that: The threshold generation module includes a filtering unit; The controller is electrically connected to the first end of the filtering unit, and the second end of the filtering unit is electrically connected to the inverting input end of the first comparator and the non-inverting input end of the second comparator respectively. The controller is used to generate a first square wave signal and a second square wave signal. The filtering unit is used to filter the first square wave signal into a first voltage threshold signal, and the filtering unit is used to filter the second square wave signal into a second voltage threshold signal.

6. The digital signal acquisition circuit according to claim 5, characterized in that: The filtering unit includes a first filtering subunit and a second filtering subunit; The controller is electrically connected to a first terminal of the first filtering subunit and a first terminal of the second filtering subunit, a second terminal of the first filtering subunit is electrically connected to an inverting input terminal of the first comparator, and a second terminal of the second filtering subunit is electrically connected to a non-inverting input terminal of the second comparator; The first filtering subunit is used to filter the first square wave signal into the first voltage threshold signal, and the second filtering subunit is used to filter the second square wave signal into the second voltage threshold signal.

7. The digital signal acquisition circuit according to claim 3, characterized in that: The voltage dividing module includes a voltage dividing unit and a frequency compensation unit; The voltage dividing unit is electrically connected to the frequency compensation unit, and the frequency compensation unit is electrically connected to the non-inverting input terminal of the first comparator and the inverting input terminal of the second comparator respectively. The voltage dividing unit is used to perform voltage division processing on the original input signal to obtain the target input signal; The frequency compensation unit is used to eliminate the influence of the voltage divider unit on the frequency of the original input signal.

8. The digital signal acquisition circuit according to claim 7, characterized in that: The voltage dividing unit includes a first resistor and a second resistor; The second end of the first resistor is electrically connected to the first end of the second resistor, the non-inverting input end of the first comparator and the inverting input end of the second comparator, and the second end of the second resistor is grounded; The first end of the first resistor is used to collect the original input signal. The original input signal is divided by the first resistor and the second resistor to obtain the target input signal.

9. The digital signal acquisition circuit according to claim 8, characterized in that: The frequency compensation unit includes a first capacitor and a second capacitor; A first end of the first capacitor is electrically connected to a first end of the first resistor, a second end of the first capacitor is electrically connected to a first end of the second resistor, a first end of the second capacitor, a non-inverting input end of the first comparator, and an inverting input end of the second comparator, and a second end of the second capacitor is grounded; wherein the resistance value of the first resistor is a first resistance value, the resistance value of the second resistor is a second resistance value, the capacitance value of the first capacitor is a first capacitance value, and the capacitance value of the second capacitor is a second capacitance value; The product of the first resistance value and the first capacitance value is a first product, the product of the second resistance value and the second capacitance value is a second product, and the first product and the second product are equal.

10. A digital signal acquisition device, characterized in that: The digital signal acquisition circuit comprises the digital signal acquisition circuit according to any one of claims 1 to 9.

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