CN114264870A - Alternating current signal conditioning system and method - Google Patents
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Abstract
The application relates to an alternating current signal conditioning system and method, and relates to the field of signal measurement. The alternating current signal conditioning system comprises an input signal attenuation unit, an adjustable capacitor unit and a control unit; the input signal attenuation unit is used for acquiring an input first voltage signal and attenuating the first voltage signal into a second voltage signal; the control unit is used for acquiring frequency and amplitude information of the first voltage signal, acquiring a target capacitance value of the adjustable capacitor unit and a target attenuation proportion of the input signal attenuation unit, controlling the attenuation proportion of the input signal attenuation unit to be adjusted to the target attenuation proportion, generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitor unit; and the adjustable capacitance unit is used for acquiring the control signal sent by the control unit and adjusting the capacitance value to a target capacitance value according to the control signal. The method and the device are used for solving the problem of conditioning the high-frequency partial characteristic curves of the large-voltage input signals in different conditioning circuits, and improving the accuracy of signal measurement.
Description
Technical Field
The present application relates to the field of signal measurement, and in particular, to an ac signal conditioning system and method.
Background
For large voltage signal, the input signal attenuation unit of the conditioning circuit needs to use a high-resistance input resistor and a feedback resistor with a corresponding proportion. The ac signal has different frequency characteristic curves in different conditioning circuits, and generally does not change much in the low frequency portion, and the capacitive and proportional compensation capacitors in the high-resistance proportional resistor start to act in the high frequency portion, and the frequency characteristic curve starts to deteriorate.
In the measurement of a high-precision digital meter on a large-voltage alternating-current signal, different voltages adopt different attenuation proportions according to voltage amplitudes, conditioning circuits are slightly different, and frequency characteristic curves of the signals are inconsistent; at the same time, due to the high accuracy requirements of the measurement, it is desirable that the frequency characteristic curve changes as smoothly as possible.
Therefore, a method for conditioning different characteristic curves to make the curve change meet the requirement is needed.
Disclosure of Invention
The application provides an alternating current signal conditioning system and method, which are used for solving the problem of conditioning high-frequency partial characteristic curves of large-voltage input signals in different conditioning circuits and improving the accuracy of signal measurement.
In a first aspect, an embodiment of the present application provides an ac signal conditioning system, including an input signal attenuation unit, an adjustable capacitance unit, and a control unit;
the first end of the input signal attenuation unit is connected with the first end of the adjustable capacitor unit, the second end of the input signal attenuation unit is connected with the second end of the adjustable capacitor unit, the controlled end of the adjustable capacitor unit is connected with the first control end of the control unit, and the controlled end of the input signal attenuation unit is connected with the second control end of the control unit;
the input signal attenuation unit is used for acquiring an input first voltage signal, attenuating the first voltage signal into a second voltage signal and sending the second voltage signal to a voltage measuring device through a post-stage conditioning circuit, wherein the amplitude of the first voltage signal is greater than a preset voltage value or the maximum allowable value of the post-stage conditioning circuit;
the control unit is configured to obtain frequency and amplitude information of the first voltage signal, obtain a target capacitance value of the adjustable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal, control the attenuation ratio of the input signal attenuation unit to be adjusted to the target attenuation ratio, generate a control signal according to the target capacitance value, and send the control signal to the adjustable capacitance unit, where the control signal is used to adjust the capacitance value of the adjustable capacitance unit to the target capacitance value;
the adjustable capacitance unit is used for acquiring the control signal sent by the control unit and adjusting the capacitance value to the target capacitance value according to the control signal.
Optionally, the input signal attenuation unit includes a feedback resistor and a feedback capacitor, and the feedback capacitor is connected in parallel to two ends of the feedback resistor;
the adjustable capacitor unit is connected in parallel at two ends of the feedback resistor.
Optionally, the adjustable capacitance unit includes a capacitor, an amplifier and a programmable proportional resistor;
the first end of the input signal attenuation unit is connected with the first end of the capacitor, the second end of the capacitor is connected with the output end of the amplifier, the input end of the amplifier is connected with the first end of the program-controlled proportional resistor, the second end of the program-controlled proportional resistor is connected with the second end of the input signal attenuation unit, and the first control end of the control unit is connected with the controlled end of the program-controlled proportional resistor;
the program-controlled proportional resistor is used for acquiring the control signal sent by the control unit and changing an internal resistor chain structure of the program-controlled proportional resistor according to the control signal so as to change a proportional relation between voltage signals of a first end and a second end of the program-controlled proportional resistor;
the amplifier is used for acquiring a voltage signal of the first end of the program-controlled proportional resistor, changing the voltage signal of the output end of the amplifier according to the voltage signal of the first end of the program-controlled proportional resistor, and adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
Optionally, the control unit is specifically configured to obtain the frequency and the amplitude information of the first voltage signal, obtain the target attenuation ratio of the input signal attenuation unit according to the amplitude information of the first voltage signal, and obtain the target capacitance value according to the frequency and the amplitude information of the first voltage signal.
Optionally, the target capacitance value and the frequency are positively correlated.
Optionally, the control unit is specifically configured to obtain the target attenuation ratio according to the amplitude information of the first voltage signal, and obtain the target capacitance value according to the frequency and the target attenuation ratio.
In a second aspect, an embodiment of the present application provides an ac signal conditioning method applied to the ac signal conditioning system in the first aspect, including:
acquiring frequency and amplitude information of the first voltage signal;
obtaining a target capacitance value of the adjustable capacitance unit and a target attenuation proportion of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal;
controlling the attenuation proportion of the input signal attenuation unit to be adjusted to the target attenuation proportion;
and generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
Optionally, the obtaining a target capacitance value of the adjustable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal includes:
acquiring the frequency and the amplitude information of the first voltage signal;
obtaining the target attenuation proportion of the input signal attenuation unit according to the amplitude information of the first voltage signal;
and obtaining the target capacitance value according to the frequency and the amplitude information of the first voltage signal.
Optionally, the target capacitance value and the frequency are positively correlated.
Optionally, the obtaining the target capacitance value according to the frequency and the amplitude information of the first voltage signal includes:
obtaining the target attenuation proportion according to the amplitude information of the first voltage signal;
and obtaining the target capacity value according to the frequency and the target attenuation proportion.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: in the embodiment of the application, an alternating current signal conditioning system is provided, and comprises an input signal attenuation unit, an adjustable capacitor unit and a control unit; the first end of the input signal attenuation unit is connected with the first end of the adjustable capacitor unit, the second end of the input signal attenuation unit is connected with the second end of the adjustable capacitor unit, the controlled end of the adjustable capacitor unit is connected with the first control end of the control unit, and the controlled end of the input signal attenuation unit is connected with the second control end of the control unit; the input signal attenuation unit is used for acquiring an input first voltage signal, attenuating the first voltage signal into a second voltage signal and sending the second voltage signal to the voltage measurement device through the post-stage conditioning circuit, wherein the amplitude of the first voltage signal is greater than a preset voltage value or the maximum allowable value of the post-stage conditioning circuit; the control unit is used for acquiring frequency and amplitude information of the first voltage signal, acquiring a target capacitance value of the adjustable capacitor unit and a target attenuation proportion of the input signal attenuation unit according to the frequency and amplitude information of the first voltage signal, controlling the attenuation proportion of the input signal attenuation unit to be adjusted to the target attenuation proportion, generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitor unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitor unit to the target capacitance value; and the adjustable capacitance unit is used for acquiring the control signal sent by the control unit and adjusting the capacitance value to a target capacitance value according to the control signal.
Compared with the prior art, the alternating current signal has different frequency characteristic curves in different conditioning circuits, under the condition that the frequency characteristic curve of a high-frequency part is deteriorated, the adjustable capacitor unit and the control unit are added in the alternating current signal conditioning system, the control unit acquires the frequency and amplitude information of the first voltage signal, obtaining a target capacitance value of the adjustable capacitance unit according to the frequency and amplitude information of the first voltage signal, generating a control signal according to the target capacitance value, sending the control signal to the adjustable capacitance unit, the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to a target capacitance value, the capacitance value of the adjustable capacitance unit can be adjusted according to the input first voltage signal, an alternating current frequency characteristic curve can be changed in the process of measuring different input signals, the measurement result of the large-voltage alternating current signal is improved, and the measurement precision is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram illustrating a frequency characteristic curve of a voltage input signal in comparison with a frequency characteristic curve of the voltage input signal after the voltage input signal passes through an input signal attenuation unit in the prior art;
FIG. 2 is a schematic diagram of an AC signal conditioning system according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a comparison between a frequency characteristic curve before the tunable capacitor unit is used in a high-frequency part of a signal and a frequency characteristic curve after the tunable capacitor unit is used in an embodiment of the present application;
FIG. 4 is a schematic diagram of an AC signal conditioning system according to an embodiment of the present application;
FIG. 5 is a schematic flow chart illustrating a method for AC signal conditioning according to an embodiment of the present application;
FIG. 6 is a schematic flow chart illustrating a method for AC signal conditioning according to an embodiment of the present application;
FIG. 7 is a schematic structural diagram of an AC signal conditioning device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventor analyzes the existing conditioning circuit of the large-voltage input signal to find that: the conditioning circuit comprises an input signal attenuation unit, the large-voltage input signal has different frequency characteristic curves in different conditioning circuits, generally, the large-voltage input signal does not change greatly in a low-frequency part, and the frequency characteristic curve begins to deteriorate in a high-frequency part.
As shown in fig. 1, the schematic diagram is a comparison diagram of a frequency characteristic curve of a voltage input signal after passing through a post-stage conditioning circuit without passing through an input signal attenuation unit and a frequency characteristic curve of the voltage input signal after passing through the post-stage conditioning circuit after passing through the input signal attenuation unit, where the voltage selects an allowable maximum value of the post-stage conditioning circuit, and the same post-stage conditioning circuit is used, so as to compare frequency characteristic influences brought by the input signal attenuation unit under the condition that the input signals are the same, and simulate the condition when the input signal is a large voltage as much as possible. In fig. 1, the abscissa is frequency, the ordinate is amplitude proportionality coefficient expressed as a ratio to the amplitude of a standard signal having a frequency of 1kHz, the solid line is a frequency characteristic curve of a voltage input signal, and the dotted line is a frequency characteristic curve of the voltage input signal after passing through an input signal attenuation unit. As can be seen from fig. 1, when the voltage input signal does not pass through the input signal attenuating unit, the signal is smooth and the high frequency part is less varied; after the signal passes through the input signal attenuation unit, the signal has obvious change and large change in a high-frequency part.
In the embodiment of the application, an alternating current signal conditioning system is provided, and the alternating current signal conditioning system comprises an input signal attenuation unit 1, an adjustable capacitor unit 2 and a control unit 3.
The first end of the input signal attenuation unit 1 is connected with the first end of the adjustable capacitor unit 2, the second end of the input signal attenuation unit 1 is connected with the second end of the adjustable capacitor unit 2, the controlled end of the adjustable capacitor unit 2 is connected with the first control end of the control unit 3, and the controlled end of the input signal attenuation unit 1 is connected with the second control end of the control unit 3.
The input signal attenuation unit 1 is configured to obtain an input first voltage signal, attenuate the first voltage signal into a second voltage signal, and send the second voltage signal to the voltage measurement device through the post-stage conditioning circuit, where an amplitude of the first voltage signal is greater than a preset voltage value or an allowable maximum value of the post-stage conditioning circuit.
The preset voltage value can be an empirical value or a numerical value obtained after a plurality of tests. For example, the preset voltage value is 50V. The amplitude of the first voltage signal is larger than a preset voltage value or the maximum value allowed by the rear-stage conditioning circuit, the first voltage signal is a large-voltage input signal, and the large-voltage input signal is different from a small voltage and can enter the rear-stage conditioning circuit and the voltage measuring device for measurement only through the input signal attenuation unit.
The control unit 3 is configured to obtain frequency and amplitude information of the first voltage signal, obtain a target capacitance value of the adjustable capacitance unit 2 and a target attenuation ratio of the input signal attenuation unit 1 according to the frequency and amplitude information of the first voltage signal, control the attenuation ratio of the input signal attenuation unit 1 to be adjusted to the target attenuation ratio, generate a control signal according to the target capacitance value, and send the control signal to the adjustable capacitance unit 2, where the control signal is used to adjust the capacitance value of the adjustable capacitance unit 2 to the target capacitance value.
The control unit 3 may acquire frequency and amplitude information of the first voltage signal sent by the measurement circuit.
The amplitude information of the first voltage signal may be the amplitude of the first voltage signal, or may be a voltage range to which the amplitude of the first voltage signal belongs, that is, a shift position.
The attenuation ratio of the input signal attenuation unit 1 refers to a ratio between the amplitudes of the first voltage signal and the second voltage signal.
The target capacitance value is a capacitance value of the adjustable capacitance unit which can enable the frequency characteristic curve of the second voltage signal to be more stable in a high-frequency part.
And the adjustable capacitor unit 2 is used for acquiring the control signal sent by the control unit 3 and adjusting the capacitance value to a target capacitance value according to the control signal.
In the embodiment of the present application, as shown in fig. 3, a schematic diagram of a comparison between a frequency characteristic curve before using an adjustable capacitor unit and a frequency characteristic curve after using the adjustable capacitor unit for a high-frequency part of a signal is shown. In fig. 3, the abscissa is frequency, the ordinate is amplitude proportionality coefficient, which is expressed as a ratio to the amplitude of a standard signal having a frequency of 1kHz, the dotted line is a frequency characteristic curve before using the tunable capacitance unit, and the solid line is a frequency characteristic curve after using the tunable capacitance unit. As can be seen from fig. 3, after the tunable capacitor unit is used, the frequency characteristic curve of the high-frequency portion of the signal is significantly improved, and the frequency characteristic curve is more stable.
Compared with the prior art, the alternating current signal has different frequency characteristic curves in different conditioning circuits, under the condition that the frequency characteristic curve of a high-frequency part is deteriorated, the adjustable capacitor unit and the control unit are added in the alternating current signal conditioning system, the control unit acquires the frequency and amplitude information of the first voltage signal, obtaining a target capacitance value of the adjustable capacitance unit according to the frequency and amplitude information of the first voltage signal, generating a control signal according to the target capacitance value, sending the control signal to the adjustable capacitance unit, the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to a target capacitance value, the capacitance value of the adjustable capacitance unit can be adjusted according to the input first voltage signal, an alternating current frequency characteristic curve can be changed in the process of measuring different input signals, the measurement result of the large-voltage alternating current signal is improved, and the measurement precision is improved.
In a specific embodiment, the input signal attenuation unit 1 includes a feedback resistor and a feedback capacitor, and the feedback capacitor is connected in parallel to two ends of the feedback resistor; the adjustable capacitor unit 2 is connected in parallel at two ends of the feedback resistor.
The input signal attenuation unit 1 generally includes an operational amplifier, an input resistor with a high resistance value and a feedback resistor with a corresponding proportion, and feedback capacitors are connected in parallel at two ends of the feedback resistor, but because the capacitance value of the feedback capacitor is fixed and unchangeable, the capacitance value cannot be changed along with the change of frequency and amplitude, in a high-frequency part, the capacitance in the input resistor with the high resistance value and the feedback capacitor start to act, and a frequency characteristic curve starts to deteriorate.
The capacitance value of the equivalent capacitor connected with the feedback resistor in parallel can be dynamically adjusted by connecting the adjustable capacitor unit 2 at two ends of the feedback resistor in parallel and adjusting the capacitance value of the adjustable capacitor unit 2, the equivalent capacitor connected with the feedback resistor in parallel comprises the capacitance of the feedback resistor, the feedback capacitor and the adjustable capacitor unit 2, the capacitance value of the adjustable capacitor unit 2 is adjusted to a target capacitance value through a control signal sent by the control unit 3 according to the difference of a conditioning circuit and input voltage or frequency, and then the capacitance value of the equivalent capacitor connected with the feedback resistor in parallel is adjusted, so that an alternating-current frequency characteristic curve can be changed, the measurement result of a high-voltage alternating-current signal is improved, and the measurement precision is improved.
In one embodiment, as shown in fig. 4, the tunable capacitor unit 2 includes a capacitor 21, an amplifier 22, and a programmable proportional resistor 23.
The first end of the input signal attenuation unit 1 is connected with the first end of the capacitor 21, the second end of the capacitor 21 is connected with the output end of the amplifier 22, the input end of the amplifier 22 is connected with the first end of the program-controlled proportional resistor 23, the second end of the program-controlled proportional resistor 23 is connected with the second end of the input signal attenuation unit 1, and the first control end of the control unit 3 is connected with the controlled end of the program-controlled proportional resistor 23.
The program-controlled proportional resistor 23 is used for acquiring a control signal sent by the control unit 3, and changing an internal resistor chain structure of the program-controlled proportional resistor 23 according to the control signal to change a proportional relationship between voltage signals of the first end and the second end of the program-controlled proportional resistor 23;
the amplifier 22 is configured to obtain a voltage signal of the first end of the program-controlled proportional resistor 23, change the voltage signal of the output end of the amplifier 22 according to the voltage signal of the first end of the program-controlled proportional resistor 23, and adjust the capacitance value of the adjustable capacitance unit 2 to a target capacitance value.
The program-controlled proportional resistor 23 may be a resistance digital-to-analog converter or a program-controlled resistor chip.
The capacitance value of the adjustable capacitance unit can be adjusted according to the control signal.
In a specific embodiment, the control unit is specifically configured to obtain frequency and amplitude information of the first voltage signal, obtain a target attenuation ratio of the input signal attenuation unit according to the amplitude information of the first voltage signal, and obtain a target capacitance value according to the frequency and amplitude information of the first voltage signal.
The amplitude information of the first voltage signal may be the amplitude of the first voltage signal, or may be a voltage range to which the amplitude of the first voltage signal belongs, that is, a shift position.
The capacitance value of the adjustable capacitor unit can be adjusted according to the frequency and amplitude information of the input first voltage signal, and then the capacitance value of the equivalent capacitor connected with the feedback resistor in parallel is adjusted, the equivalent capacitor connected with the feedback resistor in parallel comprises the capacitance of the feedback resistor, the feedback capacitor and the adjustable capacitor unit 2, an alternating current frequency characteristic curve can be changed, a large-voltage alternating current signal measurement result is improved, and the measurement precision is improved.
In one embodiment, the target capacitance value is positively correlated with the frequency.
The target capacitance value is in positive correlation with the frequency, and means that the larger the frequency of the first voltage signal is, the larger the target capacitance value is; the smaller the frequency of the first voltage signal, the larger the target capacitance value. The capacitance value of the equivalent capacitor connected with the feedback resistor in parallel can be increased by increasing the target capacitance value at the high-frequency part of the signal, the equivalent capacitor connected with the feedback resistor in parallel comprises the capacitance of the feedback resistor, the feedback capacitor and the adjustable capacitor unit 2, so that the frequency characteristic curve of the second voltage signal can be more stable at the high-frequency part, the measurement result of the high-voltage alternating current signal is improved, and the measurement precision is improved.
In a specific embodiment, the control unit is specifically configured to obtain a target attenuation ratio according to amplitude information of the first voltage signal, and obtain a target capacitance value according to the frequency and the target attenuation ratio.
The amplitude information of the first voltage signal may be the amplitude of the first voltage signal, or may be a voltage range to which the amplitude of the first voltage signal belongs, that is, a shift position.
Generally, the larger the voltage amplitude or the range to which the amplitude belongs is, the larger the attenuation proportion required for the attenuated voltage to reach the required range is, the smaller the corresponding proportional attenuation resistor is, and the larger the feedback matching capacitor is. The equivalent capacitance of the adjustable capacitance unit is determined according to the integral equivalent capacitance connected in parallel to the feedback circuit, and the equivalent capacitance connected in parallel to the feedback resistor comprises the capacitance of the feedback resistor, the feedback capacitance and the adjustable capacitance unit 2 by changing the capacitance value of the equivalent capacitance connected in parallel to the feedback resistor, so that the frequency characteristic curve of the second voltage signal can be more stable in a high-frequency part, the measurement result of the high-voltage alternating current signal is improved, and the measurement precision is improved.
In the embodiment of the present application, an ac signal conditioning method is provided, which is applied to an ac signal conditioning system provided in the embodiment of the present application, and as shown in fig. 5, a flow of the ac signal conditioning method mainly includes:
The amplitude of the first voltage signal is larger than a preset voltage value or the maximum value allowed by the post-stage conditioning circuit.
The preset voltage value can be an empirical value or a numerical value obtained after a plurality of tests. For example, the preset voltage value is 50V. The amplitude of the first voltage signal is larger than a preset voltage value or the maximum value allowed by the rear-stage conditioning circuit, the first voltage signal is a large-voltage input signal, and the large-voltage input signal is different from a small voltage and can enter the rear-stage conditioning circuit and the voltage measuring device for measurement only through the input signal attenuation unit.
The amplitude information of the first voltage signal may be the amplitude of the first voltage signal, or may be a voltage range to which the amplitude of the first voltage signal belongs, that is, a shift position.
The target capacitance value is a capacitance value of the adjustable capacitance unit which can enable the frequency characteristic curve of the second voltage signal to be more stable in a high-frequency part.
In one embodiment, obtaining a target capacitance value of the adjustable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and amplitude information of the first voltage signal includes: acquiring frequency and amplitude information of the first voltage signal; obtaining a target attenuation proportion of the input signal attenuation unit according to the amplitude information of the first voltage signal; and obtaining a target capacitance value according to the frequency and amplitude information of the first voltage signal.
The capacitance value of the adjustable capacitor unit can be adjusted according to the frequency and amplitude information of the input first voltage signal, and then the capacitance value of the equivalent capacitor connected with the feedback resistor in parallel is adjusted, the equivalent capacitor connected with the feedback resistor in parallel comprises the capacitance of the feedback resistor, the feedback capacitor and the adjustable capacitor unit 2, an alternating current frequency characteristic curve can be changed, a large-voltage alternating current signal measurement result is improved, and the measurement precision is improved.
In one embodiment, the target capacitance value is positively correlated with the frequency.
The target capacitance value is in positive correlation with the frequency, and means that the larger the frequency of the first voltage signal is, the larger the target capacitance value is; the smaller the frequency of the first voltage signal, the larger the target capacitance value. The capacitance value of the equivalent capacitor connected with the feedback resistor in parallel can be increased by increasing the target capacitance value at the high-frequency part of the signal, the equivalent capacitor connected with the feedback resistor in parallel comprises the capacitance of the feedback resistor, the feedback capacitor and the adjustable capacitor unit 2, so that the frequency characteristic curve of the second voltage signal can be more stable at the high-frequency part, the measurement result of the high-voltage alternating current signal is improved, and the measurement precision is improved.
In one embodiment, obtaining the target capacitance value according to the frequency and amplitude information of the first voltage signal includes: obtaining a target attenuation proportion according to the amplitude information of the first voltage signal; and obtaining a target capacity value according to the frequency and the target attenuation proportion.
The amplitude information of the first voltage signal may be the amplitude of the first voltage signal, or may be a voltage range to which the amplitude of the first voltage signal belongs, that is, a shift position.
Generally, the larger the voltage amplitude or the range to which the amplitude belongs is, the larger the attenuation proportion required for the attenuated voltage to reach the required range is, the smaller the corresponding proportional attenuation resistor is, and the larger the feedback matching capacitor is. The equivalent capacitance of the adjustable capacitance unit is determined according to the integral equivalent capacitance connected in parallel to the feedback circuit, and the equivalent capacitance connected in parallel to the feedback resistor comprises the capacitance of the feedback resistor, the feedback capacitance and the adjustable capacitance unit 2 by changing the capacitance value of the equivalent capacitance connected in parallel to the feedback resistor, so that the frequency characteristic curve of the second voltage signal can be more stable in a high-frequency part, the measurement result of the high-voltage alternating current signal is improved, and the measurement precision is improved.
And 504, generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
Compared with the prior art, alternating current signals have different frequency characteristic curves in different conditioning circuits, particularly, in a proportional attenuation circuit with high input impedance, due to the capacitance characteristic of a large resistor under high frequency, the frequency characteristic curve of the input alternating current signal in a high-frequency part is deteriorated, the adjustable capacitance unit and the control unit are added in an alternating current signal conditioning system, the control unit acquires the frequency and amplitude information of a first voltage signal, obtains a target capacitance value of the adjustable capacitance unit according to the frequency and amplitude information of the first voltage signal, generates a control signal according to the target capacitance value, and sends the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value, can adjust the capacitance value of the adjustable capacitance unit according to the input first voltage signal, and can measure different input signals, the alternating current frequency characteristic curve is changed, the measurement result of the large-voltage alternating current signal is improved, and the measurement precision is improved.
In one embodiment, as shown in fig. 6, the process of the method for ac signal conditioning includes:
And 603, generating a control signal by the control unit according to the target capacitance value, and sending the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
In step 604, the adjustable capacitance unit obtains the control signal sent by the control unit, and adjusts the capacitance value to the target capacitance value according to the control signal.
The input first voltage signal is changed through the attenuation proportion of the input signal attenuation unit, and the output second voltage signal can obtain a more stable frequency characteristic curve.
Based on the same concept, an ac signal conditioning device is provided in the embodiments of the present application, and specific implementation of the device may refer to the description of the method embodiment, and repeated descriptions are omitted, as shown in fig. 7, the device mainly includes:
a first obtaining module 701, configured to obtain frequency and amplitude information of the first voltage signal;
a second obtaining module 702, configured to obtain a target capacitance value of the adjustable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal;
a first processing module 703, configured to control the attenuation ratio of the input signal attenuation unit to adjust to the target attenuation ratio;
a second processing module 704, configured to generate a control signal according to the target capacitance value, and send the control signal to the adjustable capacitance unit, where the control signal is used to adjust the capacitance value of the adjustable capacitance unit to the target capacitance value.
Based on the same concept, an embodiment of the present application further provides an electronic device, as shown in fig. 8, the electronic device mainly includes: a processor 801, a memory 802, and a communication bus 803, wherein the processor 801 and the memory 802 communicate with each other via the communication bus 803. The memory 802 stores a program executable by the processor 801, and the processor 801 executes the program stored in the memory 802, so as to implement the following steps:
acquiring frequency and amplitude information of the first voltage signal; obtaining a target capacitance value of the adjustable capacitance unit and a target attenuation proportion of the input signal attenuation unit according to the frequency and amplitude information of the first voltage signal; controlling the attenuation proportion of the input signal attenuation unit to be adjusted to a target attenuation proportion; and generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
The communication bus 803 mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 803 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
The Memory 802 may include a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Alternatively, the memory may be at least one memory device located remotely from the processor 801.
The Processor 801 may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc., and may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic devices, discrete gates or transistor logic devices, and discrete hardware components.
In yet another embodiment of the present application, a computer-readable storage medium is further provided, in which a computer program is stored, which, when run on a computer, causes the computer to perform the ac signal conditioning method described in the above embodiment.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more of the available media. The available media may be magnetic media (e.g., floppy disks, hard disks, tapes, etc.), optical media (e.g., DVDs), or semiconductor media (e.g., solid state drives), among others.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An alternating current signal conditioning system is characterized by comprising an input signal attenuation unit, an adjustable capacitor unit and a control unit;
the first end of the input signal attenuation unit is connected with the first end of the adjustable capacitor unit, the second end of the input signal attenuation unit is connected with the second end of the adjustable capacitor unit, the controlled end of the adjustable capacitor unit is connected with the first control end of the control unit, and the controlled end of the input signal attenuation unit is connected with the second control end of the control unit;
the input signal attenuation unit is used for acquiring an input first voltage signal, attenuating the first voltage signal into a second voltage signal and sending the second voltage signal to a voltage measuring device through a post-stage conditioning circuit, wherein the amplitude of the first voltage signal is greater than a preset voltage value or the maximum allowable value of the post-stage conditioning circuit;
the control unit is configured to obtain frequency and amplitude information of the first voltage signal, obtain a target capacitance value of the adjustable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal, control the attenuation ratio of the input signal attenuation unit to be adjusted to the target attenuation ratio, generate a control signal according to the target capacitance value, and send the control signal to the adjustable capacitance unit, where the control signal is used to adjust the capacitance value of the adjustable capacitance unit to the target capacitance value;
the adjustable capacitance unit is used for acquiring the control signal sent by the control unit and adjusting the capacitance value to the target capacitance value according to the control signal.
2. The ac signal conditioning system of claim 1, wherein the input signal attenuation unit comprises a feedback resistor and a feedback capacitor, the feedback capacitor being connected in parallel across the feedback resistor;
the adjustable capacitor unit is connected in parallel at two ends of the feedback resistor.
3. The ac signal conditioning system of claim 2, wherein the adjustable capacitance unit comprises a capacitor, an amplifier, and a programmable proportional resistor;
the first end of the input signal attenuation unit is connected with the first end of the capacitor, the second end of the capacitor is connected with the output end of the amplifier, the input end of the amplifier is connected with the first end of the program-controlled proportional resistor, the second end of the program-controlled proportional resistor is connected with the second end of the input signal attenuation unit, and the first control end of the control unit is connected with the controlled end of the program-controlled proportional resistor;
the program-controlled proportional resistor is used for acquiring the control signal sent by the control unit and changing an internal resistor chain structure of the program-controlled proportional resistor according to the control signal so as to change a proportional relation between voltage signals of a first end and a second end of the program-controlled proportional resistor;
the amplifier is used for acquiring a voltage signal of the first end of the program-controlled proportional resistor, changing the voltage signal of the output end of the amplifier according to the voltage signal of the first end of the program-controlled proportional resistor, and adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
4. The ac signal conditioning system according to claim 2, wherein the control unit is specifically configured to obtain the frequency and the amplitude information of the first voltage signal, obtain the target attenuation ratio of the input signal attenuation unit according to the amplitude information of the first voltage signal, and obtain the target capacitance value according to the frequency and the amplitude information of the first voltage signal.
5. The alternating current signal conditioning system of claim 4 wherein the target capacity value is positively correlated with the frequency.
6. The AC signal conditioning system of claim 4, wherein the control unit is configured to obtain the target attenuation ratio according to the amplitude information of the first voltage signal, and obtain the target capacitance value according to the frequency and the target attenuation ratio.
7. An ac signal conditioning method applied to the ac signal conditioning system according to claim 1, comprising:
acquiring frequency and amplitude information of the first voltage signal;
obtaining a target capacitance value of the adjustable capacitance unit and a target attenuation proportion of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal;
controlling the attenuation proportion of the input signal attenuation unit to be adjusted to the target attenuation proportion;
and generating a control signal according to the target capacitance value, and sending the control signal to the adjustable capacitance unit, wherein the control signal is used for adjusting the capacitance value of the adjustable capacitance unit to the target capacitance value.
8. The method of claim 7, wherein obtaining a target capacitance value of the tunable capacitance unit and a target attenuation ratio of the input signal attenuation unit according to the frequency and the amplitude information of the first voltage signal comprises:
acquiring the frequency and the amplitude information of the first voltage signal;
obtaining the target attenuation proportion of the input signal attenuation unit according to the amplitude information of the first voltage signal;
and obtaining the target capacitance value according to the frequency and the amplitude information of the first voltage signal.
9. The method of claim 8, wherein the target capacity value is positively correlated with the frequency.
10. The method of claim 8, wherein obtaining the target capacitance value according to the frequency and the amplitude information of the first voltage signal comprises:
obtaining the target attenuation proportion according to the amplitude information of the first voltage signal;
and obtaining the target capacity value according to the frequency and the target attenuation proportion.
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| CN202111571960.XA CN114264870A (en) | 2021-12-21 | 2021-12-21 | Alternating current signal conditioning system and method |
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| CN202111571960.XA CN114264870A (en) | 2021-12-21 | 2021-12-21 | Alternating current signal conditioning system and method |
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