CN220084961U - Voltage signal amplitude limiting judging device - Google Patents
Voltage signal amplitude limiting judging device Download PDFInfo
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- CN220084961U CN220084961U CN202321400490.5U CN202321400490U CN220084961U CN 220084961 U CN220084961 U CN 220084961U CN 202321400490 U CN202321400490 U CN 202321400490U CN 220084961 U CN220084961 U CN 220084961U
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Abstract
The utility model discloses a voltage signal amplitude limiting judging device, and relates to the technical field of electronic circuits; the device comprises: the device comprises a first filter circuit, a voltage bias circuit, a first comparison circuit, a second comparison circuit, a logic amplitude limiting circuit and a second filter circuit; the first input end of the first filter circuit receives an input voltage signal, the second input end of the first filter circuit is connected with the transmission end of the voltage bias circuit, and the output end of the first filter circuit is respectively connected with the first input end of the first comparison circuit and the first input end of the second comparison circuit; a second input end of the first comparison circuit receives an upper limiting voltage signal; the output end of the first comparison circuit is respectively connected with the output end of the second comparison circuit, the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the output end of the second comparison circuit is connected with the input end of the second filter circuit; the logic amplitude limiting circuit is connected with the input end of the second filter circuit; the output end of the second filter circuit outputs the logic level after the amplitude limiting judgment.
Description
Technical Field
The utility model relates to the field of electronic circuits, in particular to a voltage signal amplitude limiting judging device.
Background
This section is intended to provide a background or context to the embodiments of the utility model that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
In the process of using the electronic equipment, the electronic equipment needs to be operated in a preset voltage range, if the provided voltage exceeds the voltage range which can be born by the electronic equipment, the performance of the electronic equipment can be affected, and the problems of overheating, burning or damage of the electronic equipment can be caused, so that the normal operation of the electronic equipment is affected, and therefore, the amplitude limiting judgment of the voltage signal needs to be carried out before the voltage signal is input into the electronic equipment.
Therefore, how to provide a voltage signal clipping judgment device with simple circuit structure and high reliability is a problem to be solved by those skilled in the art.
Disclosure of Invention
In an embodiment of the present utility model, a voltage signal clipping determination device is provided, configured to convert an input voltage signal into a logic level, determine whether the input voltage signal exceeds a preset voltage clipping range according to the logic level, and include: the device comprises a first filter circuit, a voltage bias circuit, a first comparison circuit, a second comparison circuit, a logic amplitude limiting circuit and a second filter circuit;
the first input end of the first filter circuit receives an input voltage signal, the second input end of the first filter circuit is connected with the transmission end of the voltage bias circuit, and the output end of the first filter circuit is respectively connected with the first input end of the first comparison circuit and the first input end of the second comparison circuit; a second input end of the first comparison circuit receives an upper limiting voltage signal; the output end of the first comparison circuit is respectively connected with the output end of the second comparison circuit, the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the second input end of the second comparison circuit receives the lower limiting voltage signal; the output end of the second comparison circuit is respectively connected with the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the transmission end of the logic amplitude limiting circuit is connected with the input end of the second filter circuit; the output end of the second filter circuit outputs logic level after amplitude limiting judgment;
the first filter circuit is used for receiving an input voltage signal and filtering the positive voltage signal converted by the voltage bias circuit; the voltage bias circuit is used for converting the input voltage signal received by the first filter circuit into a positive voltage signal; the first comparison circuit is used for receiving the upper limiting voltage signal, comparing the maximum amplitude of the upper limiting voltage signal with the positive voltage signal output by the first filter circuit, and outputting a first level according to the comparison result; the second comparison circuit is used for receiving the lower limiting voltage signal, comparing the minimum amplitude of the lower limiting voltage signal and the positive voltage signal output by the first filter circuit, and outputting a second level according to the comparison result; the logic amplitude limiting circuit is used for judging the logic relation between the first level and the second level and outputting the logic level; the second filter circuit is used for filtering the logic level and outputting the filtered logic level.
Further, the first filter circuit includes: the first resistor, the third resistor, the first capacitor and the second capacitor;
the first end of the first resistor is a first input end of the first filter circuit, the second end of the first resistor is connected with the first end of the third resistor and the first end of the first capacitor respectively, the second end of the first resistor is a second input end of the first filter circuit, the second end of the third resistor is connected with the first end of the second capacitor, the second end of the first capacitor and the second end of the second capacitor are connected with the reference ground, and the second end of the third resistor is an output end of the first filter circuit.
Further, the resistance value of the first resistor is 3.3kΩ; the resistance value of the third resistor is 470 omega; the capacitance of the first capacitor and the second capacitor is 220pF.
Further, the voltage bias circuit includes: a 3.3V power supply, a second resistor;
the first end of the second resistor is connected with a 3.3V power supply, and the second end of the second resistor is a transmission end of the voltage bias circuit.
Further, the resistance value of the second resistor is 3.3kΩ.
Further, the first comparison circuit includes: a first operational amplifier, a fifth resistor, an eighth resistor, and a fourth capacitor;
the second input end of the first operational amplifier is the first input end of the first comparison circuit, the first end of the fifth resistor is the second input end of the first comparison circuit, the first end of the fifth resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is connected with the reference ground, the second end of the fifth resistor is respectively connected with the first end of the eighth resistor and the first input end of the first operational amplifier, the output end of the first operational amplifier is connected with the second end of the eighth resistor, and the output end of the first operational amplifier is the output end of the first comparison circuit.
Further, the resistance value of the fifth resistor is 22kΩ; the resistance value of the eighth resistor is 1MΩ; the capacitance value of the fourth capacitor is 1000pF; the first operational amplifier is of model LF353M.
Further, the second comparison circuit includes: the second operational amplifier, the third capacitor, the sixth resistor and the seventh resistor;
the first end of the sixth resistor is a first input end of the second comparison circuit, the second end of the sixth resistor is respectively connected with the first end of the seventh resistor and the first input end of the second operational amplifier, the second input end of the second operational amplifier is a second input end of the second comparison circuit, the second input end of the second operational amplifier is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the reference ground, the output end of the second operational amplifier is connected with the second end of the seventh resistor, and the output end of the second operational amplifier is an output end of the second comparison circuit.
Further, the sixth resistor has a resistance of 22kΩ; the resistance value of the seventh resistor is 1MΩ; the capacitance value of the third capacitor is 220pF; the second operational amplifier is of model LF353M.
Further, the logic clipping circuit includes: a 3.3V power supply, a ninth resistor;
the first end of the ninth resistor is connected with a 3.3V power supply, and the second end of the ninth resistor is a transmission end of the logic amplitude limiting circuit.
Further, the resistance value of the ninth resistor is 1kΩ.
Further, the second filter circuit includes: a fourth resistor and a fifth capacitor;
the first end of the fourth resistor is an input end of the second filter circuit, the second end of the fourth resistor is connected with the first end of the fifth capacitor, the second end of the fifth capacitor is connected with the reference ground, and the second end of the fourth resistor is an output end of the second filter circuit.
Further, the resistance value of the fourth resistor is 470 Ω; the capacitance of the fifth capacitor is 1000pF.
Further, the logic level includes: 0V and 3.3V.
The embodiment of the utility model can solve the problem that the normal operation of the electronic equipment is affected when the input voltage signal exceeds the voltage range born by the electronic equipment. The embodiment of the utility model comprises a first filter circuit, a voltage bias circuit, a first comparison circuit, a second comparison circuit, a logic amplitude limiting circuit and a second filter circuit; the first input end of the first filter circuit receives an input voltage signal, the second input end of the first filter circuit is connected with the transmission end of the voltage bias circuit, and the output end of the first filter circuit is respectively connected with the first input end of the first comparison circuit and the first input end of the second comparison circuit; a second input end of the first comparison circuit receives an upper limiting voltage signal; the output end of the first comparison circuit is respectively connected with the output end of the second comparison circuit, the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the second input end of the second comparison circuit receives the lower limiting voltage signal; the output end of the second comparison circuit is respectively connected with the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the transmission end of the logic amplitude limiting circuit is connected with the input end of the second filter circuit; the output end of the second filter circuit outputs logic level after amplitude limiting judgment; the first filter circuit is used for receiving an input voltage signal and filtering the positive voltage signal converted by the voltage bias circuit; the voltage bias circuit is used for converting the input voltage signal received by the first filter circuit into a positive voltage signal; the first comparison circuit is used for receiving the upper limiting voltage signal, comparing the maximum amplitude of the upper limiting voltage signal with the positive voltage signal output by the first filter circuit, and outputting a first level according to the comparison result; the second comparison circuit is used for receiving the lower limiting voltage signal, comparing the minimum amplitude of the lower limiting voltage signal and the positive voltage signal output by the first filter circuit, and outputting a second level according to the comparison result; the logic amplitude limiting circuit is used for judging the logic relation between the first level and the second level and outputting the logic level; the second filter circuit is used for filtering the logic level and outputting the filtered logic level. The embodiment of the utility model realizes the conversion of the input voltage signal into the logic level, determines whether the input voltage signal exceeds the preset voltage limiting range through the logic level, stops the operation of the electronic equipment when the input voltage signal exceeds the preset voltage limiting range, and can protect the electronic equipment; the embodiment of the utility model filters the input voltage signal and the output logic level, enhances the anti-interference performance of the device and improves the reliability.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of a voltage signal clipping judgment device according to an embodiment of the present utility model.
Fig. 2 is a circuit diagram of a voltage signal clipping judgment device according to an embodiment of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the embodiments of the present utility model will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present utility model and their descriptions herein are for the purpose of explaining the present utility model, but are not to be construed as limiting the utility model.
The term "and/or" is used herein to describe only one relationship, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are open-ended terms, meaning including, but not limited to. The description of the reference terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The order of steps involved in the embodiments is illustrative of the practice of the utility model, and is not limited and may be suitably modified as desired.
Fig. 1 is a schematic diagram of a voltage signal clipping judgment device according to an embodiment of the present utility model, where, as shown in fig. 1, the voltage signal clipping judgment device includes: a first filter circuit 1, a voltage bias circuit 2, a first comparison circuit 3, a second comparison circuit 4, a logic clipping circuit 5 and a second filter circuit 6;
the first input end of the first filter circuit 1 receives an input voltage signal, the second input end of the first filter circuit 1 is connected with the transmission end of the voltage bias circuit 2, and the output end of the first filter circuit 1 is respectively connected with the first input end of the first comparison circuit 3 and the first input end of the second comparison circuit 4; a second input terminal of the first comparison circuit 3 receives the upper limited voltage signal; the output end of the first comparison circuit 3 is respectively connected with the output end of the second comparison circuit 4, the transmission end of the logic amplitude limiting circuit 5 and the input end of the second filter circuit 6; a second input end of the second comparison circuit 4 receives a lower limiting voltage signal; the output end of the second comparison circuit 4 is respectively connected with the transmission end of the logic amplitude limiting circuit 5 and the input end of the second filter circuit 6; the transmission end of the logic amplitude limiting circuit 5 is connected with the input end of the second filter circuit 6; the output end of the second filter circuit 6 outputs the logic level after the amplitude limiting judgment;
the first filter circuit 1 is used for receiving an input voltage signal and filtering a positive voltage signal converted by the voltage bias circuit 2; the voltage bias circuit 2 is used for converting an input voltage signal received by the first filter circuit 1 into a positive voltage signal; the first comparing circuit 3 is configured to receive the upper limited voltage signal, compare the maximum amplitude of the upper limited voltage signal with the positive voltage signal output by the first filtering circuit 1, and output a first level according to the comparison result; the second comparison circuit 4 is used for receiving the lower limiting voltage signal, comparing the minimum amplitude of the lower limiting voltage signal and the positive voltage signal output by the first filter circuit, and outputting a second level according to the comparison result; the logic clipping circuit 5 is used for judging the logic relationship between the first level and the second level and outputting the logic level; the second filter circuit 6 is configured to filter the logic level and output the filtered logic level.
Fig. 2 is a circuit diagram of a voltage signal clipping judgment device according to an embodiment of the present utility model.
In one embodiment, referring to fig. 2, the first filter circuit 1 includes: the first resistor R1, the third resistor R3, the first capacitor C1 and the second capacitor C2; the first end of the first resistor R1 is a first input end of the first filter circuit 1, the second end of the first resistor R1 is connected with the first end of the third resistor R3 and the first end of the first capacitor C1 respectively, the second end of the first resistor R1 is a second input end of the first filter circuit 1, the second end of the third resistor R3 is connected with the first end of the second capacitor C2, the second end of the first capacitor C1 and the second end of the second capacitor C2 are connected with the reference ground, and the second end of the third resistor R3 is an output end of the first filter circuit 1; the first end of the first resistor R1 receives the input voltage signal Vin, and outputs the voltage signal vin_t after being filtered by the first filter circuit 1. The first filter circuit 1 can filter out the high-frequency interference voltage signal, so that the voltage signal is more stable.
In one embodiment, referring to fig. 2, the voltage bias circuit 2 includes: a 3.3V power supply, a second resistor R2; the first end of the second resistor R2 is connected with a 3.3V power supply, and the second end of the second resistor R2 is a transmission end of the voltage bias circuit 2; that is, the second end of the second resistor R2 is connected to the second end of the first resistor R1 and the first end of the third resistor R3, respectively. The voltage bias circuit 2 is configured to convert an input sinusoidal voltage signal into a voltage signal inputted in the forward direction.
In one embodiment, referring to fig. 2, the first comparison circuit 3 includes: a first operational amplifier U1A, a fifth resistor R5, an eighth resistor R8 and a fourth capacitor C4; the second input end of the first operational amplifier U1A is a first input end of the first comparing circuit 3, the first end of the fifth resistor R5 is a second input end of the first comparing circuit 3, the first end of the fifth resistor R5 is connected with the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected with the reference ground, the second end of the fifth resistor R5 is respectively connected with the first end of the eighth resistor R8 and the first input end of the first operational amplifier U1A, the output end of the first operational amplifier U1A is connected with the second end of the eighth resistor R8, and the output end of the first operational amplifier U1A is the output end of the first comparing circuit 3. Specifically, the output signal of the output end of the first operational amplifier U1A is fed back through the eighth resistor R8, so that the influence of the second operational amplifier U1B on the first operational amplifier U1A is reduced, and weak isolation between the first comparison circuit 3 and the second comparison circuit 4 is realized; the first input end of the first operational amplifier U1A is a negative input pin 32, the second input end of the first operational amplifier U1A is a positive input pin 33, and the output end of the first operational amplifier U1A is an output pin 31; the first input end of the first comparison circuit 3 receives an upper limiting voltage signal V_LimH, the first comparison circuit 3 is used for comparing the upper limiting voltage signal V_LimH with the maximum amplitude of a voltage signal vin_t output by the first filter circuit and outputting a first level, and if the maximum amplitude is smaller than or equal to the upper limiting voltage signal V_LimL, the first level is 0V; if the maximum amplitude is greater than the upper clipping voltage signal V_limH, the second level is 1V.
In an embodiment, referring to fig. 2, the second comparing circuit 4 includes: the second operational amplifier U1B, the third capacitor C3, the sixth resistor R6 and the seventh resistor R7; the first end of the sixth resistor R6 is the first input end of the second comparing circuit 4, the second end of the sixth resistor R6 is connected to the first end of the seventh resistor R7 and the first input end of the second operational amplifier U1B, the second input end of the second operational amplifier U1B is the second input end of the second comparing circuit 4, the second input end of the second operational amplifier U1B is connected to the first end of the third capacitor C3, the second end of the third capacitor C3 is connected to the reference ground, the output end of the second operational amplifier U1B is connected to the second end of the seventh resistor R7, and the output end of the second operational amplifier U1B is the output end of the second comparing circuit 4. Specifically, the first input end of the second operational amplifier U1B is a positive input pin 43, the second input end of the second operational amplifier U1A is a negative input pin 42 for receiving the lower limiting voltage signal v_liml, and the output end of the first operational amplifier U1A is an output pin 41; the second comparing circuit 4 is configured to compare the lower limiting voltage signal v_liml with a minimum amplitude value of the voltage signal vin_t output by the first filtering circuit, and output a second level, where the second level is 0V if the minimum amplitude value is greater than or equal to the lower limiting voltage signal v_liml; if the minimum amplitude is smaller than the lower limiting voltage signal V_LimL, the second level is 1V.
In an embodiment, the first operational amplifier U1A and the second operational amplifier U1B are integrated in a chip, so that errors caused by temperature drift are reduced, +15V and-15V are adopted to supply power to the first operational amplifier U1A and the second operational amplifier U1B, full-range linear coverage of input voltage +10V to-10V is realized, and linear range of the input voltage is enlarged.
In one embodiment, referring to fig. 2, the logic clipping circuit 5 includes: a 3.3V power supply, a ninth resistor R9; the first end of the ninth resistor R9 is connected to a 3.3V power supply, and the second end of the ninth resistor R9 is a transmission end of the logic clipping circuit 5. Specifically, the logic limiter circuit 5 judges the logic relationship between the first level and the second level, and outputs the logic level; if the first level is 0V, the second level is 0V, and the output logic level is 0V of the low level; if the first level is 1V, the second level is 0V, and the output logic level is 3.3V of the high level; if the first level is 0V, the second level is 1V, and the output logic level is 3.3V of the high level; if the first level is 1V, the second level is 1V, and the output logic level is 3.3V.
In an embodiment, referring to fig. 2, the second filter circuit 6 includes: a fourth resistor R4 and a fifth capacitor C5; the first end of the fourth resistor R4 is an input end of the second filter circuit 6, the second end of the fourth resistor R4 is connected with the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is connected with the reference ground, and the second end of the fourth resistor R4 is an output end of the second filter circuit 6. Specifically, the second filter circuit 6 filters the logic level, outputs the filtered logic level Vout, and when the logic level is 0V, the input voltage signal does not exceed the preset voltage limiting range, so that the electronic device can operate normally; when the logic level is 3.3V, the input voltage signal exceeds the preset voltage limiting range, and the electronic equipment needs to be stopped, so that the electronic equipment can be protected.
In one embodiment, the resistance of the first resistor R1 and the second resistor R2 is 3.3kΩ; the resistance value of the third resistor R3 and the fourth resistor R4 is 470 omega; the resistance value of the fifth resistor R5 and the sixth resistor R6 is 22kΩ; the resistance value of the seventh resistor R7 and the eighth resistor R8 is 1MΩ; the resistance value of the ninth resistor is 1kΩ; the capacitance of the first capacitor C1, the second capacitor C2 and the third capacitor C3 is 220pF; the capacitance of the fourth capacitor C4 and the fifth capacitor C5 is 1000pF. The resistor and the capacitor used in the embodiment of the utility model are of common types, and the practical range of the utility model is enlarged.
In one embodiment, the first operational amplifier U1A and the second operational amplifier U1B are model LF353M.
In summary, the embodiment of the utility model includes a first filter circuit, a voltage bias circuit, a first comparator circuit, a second comparator circuit, a logic limiter circuit, and a second filter circuit; the first input end of the first filter circuit receives an input voltage signal, the second input end of the first filter circuit is connected with the transmission end of the voltage bias circuit, and the output end of the first filter circuit is respectively connected with the first input end of the first comparison circuit and the first input end of the second comparison circuit; a second input end of the first comparison circuit receives an upper limiting voltage signal; the output end of the first comparison circuit is respectively connected with the output end of the second comparison circuit, the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the second input end of the second comparison circuit receives the lower limiting voltage signal; the output end of the second comparison circuit is respectively connected with the transmission end of the logic amplitude limiting circuit and the input end of the second filter circuit; the transmission end of the logic amplitude limiting circuit is connected with the input end of the second filter circuit; the output end of the second filter circuit outputs logic level after amplitude limiting judgment; the first filter circuit is used for receiving an input voltage signal and filtering the positive voltage signal converted by the voltage bias circuit; the voltage bias circuit is used for converting the input voltage signal received by the first filter circuit into a positive voltage signal; the first comparison circuit is used for receiving the upper limiting voltage signal, comparing the maximum amplitude of the upper limiting voltage signal with the positive voltage signal output by the first filter circuit, and outputting a first level according to the comparison result; the second comparison circuit is used for receiving the lower limiting voltage signal, comparing the minimum amplitude of the lower limiting voltage signal and the positive voltage signal output by the first filter circuit, and outputting a second level according to the comparison result; the logic amplitude limiting circuit is used for judging the logic relation between the first level and the second level and outputting the logic level; the second filter circuit is used for filtering the logic level and outputting the filtered logic level. The embodiment of the utility model has the advantages that the number of used components is small, the structure is simple, the input voltage signal is converted into the logic level, whether the input voltage signal exceeds the preset voltage limiting range or not is determined through the logic level, and when the input voltage signal exceeds the preset voltage limiting range, the electronic equipment is stopped, so that the electronic equipment can be protected; the embodiment of the utility model carries out multistage low-pass filtering on the input voltage signal and the output logic level, enhances the anti-interference performance of the device, has strong applicability and improves the reliability.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (14)
1. A voltage signal clipping judgment device, characterized by comprising: the device comprises a first filter circuit (1), a voltage bias circuit (2), a first comparison circuit (3), a second comparison circuit (4), a logic amplitude limiting circuit (5) and a second filter circuit (6);
the first input end of the first filter circuit (1) receives an input voltage signal, the second input end of the first filter circuit (1) is connected with the transmission end of the voltage bias circuit (2), and the output end of the first filter circuit (1) is respectively connected with the first input end of the first comparison circuit (3) and the first input end of the second comparison circuit (4); a second input end of the first comparison circuit (3) receives an upper limiting voltage signal; the output end of the first comparison circuit (3) is respectively connected with the output end of the second comparison circuit (4), the transmission end of the logic amplitude limiting circuit (5) and the input end of the second filter circuit (6); a second input end of the second comparison circuit (4) receives a lower limiting voltage signal; the output end of the second comparison circuit (4) is respectively connected with the transmission end of the logic amplitude limiting circuit (5) and the input end of the second filter circuit (6); the transmission end of the logic amplitude limiting circuit (5) is connected with the input end of the second filter circuit (6); the output end of the second filter circuit (6) outputs logic level after limiting judgment;
the first filter circuit (1) is used for receiving an input voltage signal and filtering the positive voltage signal converted by the voltage bias circuit (2); the voltage bias circuit (2) is used for converting an input voltage signal received by the first filter circuit (1) into a positive voltage signal; the first comparison circuit (3) is used for receiving the upper limiting voltage signal, comparing the maximum amplitude of the upper limiting voltage signal with the positive voltage signal output by the first filter circuit (1), and outputting a first level according to the comparison result; the second comparison circuit (4) is used for receiving the lower limiting voltage signal, comparing the minimum amplitude of the lower limiting voltage signal and the positive voltage signal output by the first filter circuit, and outputting a second level according to the comparison result; the logic amplitude limiting circuit (5) is used for judging the logic relation between the first level and the second level and outputting the logic level; the second filter circuit (6) is used for filtering the logic level and outputting the filtered logic level.
2. The voltage signal clipping judgment device according to claim 1, wherein the first filter circuit (1) includes: the first resistor, the third resistor, the first capacitor and the second capacitor;
the first end of the first resistor is a first input end of the first filter circuit (1), the second end of the first resistor is connected with the first end of the third resistor and the first end of the first capacitor respectively, the second end of the first resistor is a second input end of the first filter circuit (1), the second end of the third resistor is connected with the first end of the second capacitor, the second end of the first capacitor and the second end of the second capacitor are connected with the reference ground, and the second end of the third resistor is an output end of the first filter circuit (1).
3. The voltage signal clipping judgment device according to claim 2, wherein the resistance value of the first resistor is 3.3kΩ; the resistance value of the third resistor is 470 omega; the capacitance of the first capacitor and the second capacitor is 220pF.
4. The voltage signal clipping judgment device according to claim 1, wherein the voltage bias circuit (2) includes: a 3.3V power supply, a second resistor;
the first end of the second resistor is connected with a 3.3V power supply, and the second end of the second resistor is a transmission end of the voltage bias circuit (2).
5. The voltage signal clipping judgment device of claim 4, wherein the second resistor has a resistance value of 3.3kΩ.
6. The voltage signal clipping judgment device according to claim 1, wherein the first comparison circuit (3) includes: a first operational amplifier, a fifth resistor, an eighth resistor, and a fourth capacitor;
the second input end of the first operational amplifier is the first input end of the first comparison circuit (3), the first end of the fifth resistor is the second input end of the first comparison circuit (3), the first end of the fifth resistor is connected with the first end of the fourth capacitor, the second end of the fourth capacitor is connected with the reference ground, the second end of the fifth resistor is respectively connected with the first end of the eighth resistor and the first input end of the first operational amplifier, the output end of the first operational amplifier is connected with the second end of the eighth resistor, and the output end of the first operational amplifier is the output end of the first comparison circuit (3).
7. The voltage signal clipping judgment device of claim 6, wherein the fifth resistor has a resistance value of 22kΩ; the resistance value of the eighth resistor is 1MΩ; the capacitance value of the fourth capacitor is 1000pF; the first operational amplifier is of model LF353M.
8. The voltage signal clipping judgment device according to claim 1, wherein the second comparison circuit (4) includes: the second operational amplifier, the third capacitor, the sixth resistor and the seventh resistor;
the first end of the sixth resistor is the first input end of the second comparison circuit (4), the second end of the sixth resistor is connected with the first end of the seventh resistor and the first input end of the second operational amplifier respectively, the second input end of the second operational amplifier is the second input end of the second comparison circuit (4), the second input end of the second operational amplifier is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the reference ground, the output end of the second operational amplifier is connected with the second end of the seventh resistor, and the output end of the second operational amplifier is the output end of the second comparison circuit (4).
9. The voltage signal clipping judgment device of claim 8, wherein the sixth resistor has a resistance value of 22kΩ; the resistance value of the seventh resistor is 1MΩ; the capacitance value of the third capacitor is 220pF; the second operational amplifier is of model LF353M.
10. The voltage signal clipping judgment device according to claim 1, wherein the logic clipping circuit (5) includes: a 3.3V power supply, a ninth resistor;
the first end of the ninth resistor is connected with a 3.3V power supply, and the second end of the ninth resistor is a transmission end of the logic amplitude limiting circuit (5).
11. The voltage signal clipping judgment device of claim 10, wherein the resistance value of the ninth resistor is 1kΩ.
12. The voltage signal clipping judgment device according to claim 1, wherein the second filter circuit (6) includes: a fourth resistor and a fifth capacitor;
the first end of the fourth resistor is the input end of the second filter circuit (6), the second end of the fourth resistor is connected with the first end of the fifth capacitor, the second end of the fifth capacitor is connected with the reference ground, and the second end of the fourth resistor is the output end of the second filter circuit (6).
13. The voltage signal clipping judgment device of claim 12, wherein the resistance value of the fourth resistor is 470 Ω; the capacitance of the fifth capacitor is 1000pF.
14. The voltage signal clipping judgment device according to claim 1, wherein the logic level includes: 0V and 3.3V.
Priority Applications (1)
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