CN217587365U - Sampling circuit module - Google Patents
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- CN217587365U CN217587365U CN202123352851.7U CN202123352851U CN217587365U CN 217587365 U CN217587365 U CN 217587365U CN 202123352851 U CN202123352851 U CN 202123352851U CN 217587365 U CN217587365 U CN 217587365U
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Abstract
The embodiment of the utility model provides a sampling circuit module is provided. The module comprises a first sampling module, a second sampling module and a third sampling module, wherein the first sampling module is used for collecting alternating current signals output by the tested equipment to obtain first voltage signals; the second sampling module is used for acquiring a direct current signal output by the tested device to obtain a second voltage signal; and the third sampling module is used for acquiring the alternating current or direct current voltage signal output by the tested equipment to obtain a third voltage signal. The first sampling module comprises a current mutual inductance unit and an amplification unit, and the current mutual inductance unit is formed by different numbers of turns of coils corresponding to different first switches. According to the utility model discloses sampling circuit module can sample current signal and voltage signal, simultaneously, can confirm closed first switch according to the alternating current signal, and then confirms the coil number of turns of current transformer unit, obtains more accurate alternating current sampling result.
Description
Technical Field
The utility model belongs to the technical field of signal processing, especially, relate to a sampling circuit module.
Background
In the prior art, when signal processing is performed, the electrical signal needs to be sampled in order to analyze and filter the electrical signal. In the prior art, when a high-precision sampling circuit is used for sampling alternating current, direct current, alternating voltage and direct voltage, the sampling circuit formed by devices such as a current transformer, an amplifier, a resistor and the like is mainly used for sampling, when the sampling circuit is used for sampling electric signals, various noises and errors are easily introduced, and the obtained result error is large in subsequent filtering and noise reduction.
Disclosure of Invention
The embodiment of the utility model provides a sampling circuit module can confirm current transformer's coil number of turns according to the alternating current signal who acquires, and then confirms corresponding measuring range, obtains more accurate signal sampling data.
In a first aspect, an embodiment of the present invention provides a sampling current module, which includes:
the device comprises a first sampling module, a second sampling module and a third sampling module which are respectively electrically connected with a tested device;
the first sampling module is used for acquiring alternating current signals output by the tested equipment to obtain first voltage signals;
the second sampling module is used for acquiring a direct current signal output by the tested device to obtain a second voltage signal;
the third sampling module is used for collecting alternating current or direct current voltage signals output by the tested equipment to obtain third voltage signals;
the first voltage signal, the second voltage signal and the third voltage signal are output to the signal processing module in parallel;
wherein, the first sampling module includes:
the current mutual inductance unit is electrically connected with the tested equipment through at least two first switches which are connected in parallel, and is used for reducing the alternating current signal according to the number of turns of a coil of the current mutual inductance unit to obtain a first current signal when the first sampling module determines a target first switch in the at least two closed first switches according to the alternating current signal; the at least two first switches correspond to the at least two coil turns of the current mutual inductance unit one by one;
and the amplifying unit is electrically connected with the current mutual inductance unit and is used for amplifying the first current signal to obtain a second current signal and outputting a first voltage signal corresponding to the second current signal.
The utility model discloses sampling circuit module can utilize three sampling module to sample alternating current signal, direct current signal and voltage signal respectively, and when wherein sampling alternating current signal, according to the mutual inductive unit of electric current of alternating current signal determination different coil turns, can acquire more accurate alternating current sampling result.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a sampling circuit module according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sampling circuit module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first sampling module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second sampling module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a third sampling module according to an embodiment of the present invention.
Detailed Description
The features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.
It is noted that, herein, 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 … …" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
At present, in the prior art, when an electric signal is sampled, the sampling is performed during the period of a current transformer, an amplifier, a resistor and the like, noise and errors are easily introduced in the processing process, and a result obtained in the subsequent processing has a large error.
In order to solve the prior art problem, the embodiment of the utility model provides a sampling circuit module is provided. The following first introduces a sampling circuit module provided by an embodiment of the present invention.
Fig. 1 shows a schematic diagram of a sampling circuit module 100 according to an embodiment of the present invention. As shown in fig. 1, the module may include a first sampling module 110, a second sampling module 120, and a third sampling module 130 electrically connected to the device under test, respectively;
the first sampling module 110 is configured to collect an alternating current signal output by a device under test to obtain a first voltage signal;
the second sampling module 120 is configured to collect a dc current signal output by the device under test to obtain a second voltage signal;
the third sampling module 130 is configured to collect an alternating current or direct current voltage signal output by the device under test to obtain a third voltage signal;
the first voltage signal, the second voltage signal and the third voltage signal are output to the signal processing module in parallel;
wherein, the first sampling module 110 includes:
the current transformer unit 210 is electrically connected with the device to be tested through at least two first switches connected in parallel, and is configured to reduce the alternating current signal according to the number of turns of a coil of the current transformer unit to obtain a first current signal when the first sampling module determines a target first switch of the at least two closed first switches according to the alternating current signal; the at least two first switches correspond to the at least two coil turns of the current mutual inductance unit one by one;
and the amplifying unit 220 is electrically connected with the current transformer unit, and is used for amplifying the first current signal to obtain a second current signal and outputting a first voltage signal corresponding to the second current signal.
The embodiment of the utility model provides a sampling circuit module can utilize three sampling module to sample alternating current signal, direct current signal and voltage signal respectively, and wherein the mutual inductive unit of electric current of the different coil turns that first sampling module includes can select according to alternating current signal, realizes the accurate sampling to alternating current.
In this embodiment, as shown in fig. 2, the first sampling module 110 includes a transformer sub-module 111 and an amplifier sub-module 112; the transformer submodule is electrically connected with the current input end of the tested device through the alternating current switch K1 and used for reducing alternating current output by the tested device to obtain a first current signal; and the amplifier submodule is electrically connected with the transformer submodule and is used for amplifying the first current signal to obtain a second current signal and outputting a first voltage signal corresponding to the second current signal. When the tested equipment outputs an alternating current signal, the alternating current switch K1 is closed; when the tested equipment outputs a direct current signal, the alternating current switch K1 is switched off.
In this embodiment, as shown in fig. 2, the second sampling module 120 includes a sampling resistance sub-module 121 and an amplifier sub-module 122; the sampling resistor submodule is electrically connected with the current input end of the tested device through a direct current switch K2 and is used for acquiring a target voltage signal obtained by the direct current flowing through the sampling resistor submodule; and the amplifier submodule is electrically connected with the sampling resistor submodule and is used for amplifying the target voltage signal to obtain a second voltage signal. When the tested equipment outputs a direct current signal, the direct current switch K2 is closed; when the tested equipment outputs an alternating current signal, the direct current switch K2 is switched off.
In this embodiment, as shown in fig. 2, the third sampling module 130 includes a voltage dividing network sub-module 131 and an amplifier sub-module 132; the voltage division network submodule is electrically connected with a voltage input end of the tested equipment and used for acquiring an initial voltage signal obtained by voltage division of the voltage signal; and the amplifier submodule is electrically connected with the voltage division network submodule and used for amplifying the initial voltage signal to obtain a third voltage signal.
Fig. 3 shows a schematic structural diagram of a first sampling module according to an embodiment of the present invention. As shown in fig. 3, the transformer submodule 111 includes a current transformer unit 210 and at least one first switch. The current mutual inductance unit comprises a current transformer T2, a first diode D14 and a second diode D15, wherein the first diode and the second diode are connected in parallel: the current transformer is electrically connected with the at least two first switches which are connected in parallel and used for reducing alternating current according to the number of turns of the coil corresponding to the closed target first switch to obtain a first current signal; a first diode D14 electrically connected to an output terminal of the current transformer in a first direction for conducting a first current signal in the first direction; and a second diode D15 electrically connected to the output terminal of the current transformer in a second direction for conducting a first current in the second direction, wherein the first direction is opposite to the second direction. It should be noted that fig. 2 is only an exemplary diagram, the number of the first switches is 3, and the number of the first switches may be set, which is not limited. The first switches K3, K4 and K5 respectively correspond to the turns of the primary winding coil of the current transformer, namely 1 turn, 3 turns and 30 turns, and the corresponding current measurement ranges are respectively 30A, 10A and 1A. The current transformer adopts a 0.02% high-precision zero-flux current transformer. And determining a closed first switch according to the current signal output by the tested equipment, and reducing the current signal according to the number of turns of a coil corresponding to the closed first switch to obtain a first current signal. The diode D14/D15 through which the first current signal passes is determined according to the direction of the first current signal.
In some embodiments, as shown in fig. 3, the corresponding coils of the first switches K4, K5 are connected in series with fuses F8, F9, respectively.
In some embodiments, the amplifying unit 220 includes an operational amplifier, m resistors connected in parallel, and m-1 second switches; the non-inverting input end of the operational amplifier is electrically connected with the first ends of the first diode and the second diode, and the non-inverting input end of the operational amplifier is electrically connected with the reference voltage end; the inverting input end of the operational amplifier is electrically connected with the second ends of the first diode and the second diode, the output end of the operational amplifier is electrically connected with the first ends of the m resistors which are connected in parallel, and the second ends of the m resistors which are connected in parallel are electrically connected with the inverting input end of the operational amplifier; wherein m is an integer not less than 2, and m resistors connected in parallel have different resistance values; the m-1 second switches are respectively connected with m-1 resistors in the m resistors connected in parallel in series, and the m-1 second switches are in one-to-one correspondence with the m-1 resistors. As shown in fig. 3, the amplifying unit includes an operational amplifier U5, 3 resistors connected in parallel, and 2 switches connected in parallel. It should be understood that fig. 3 is only an exemplary diagram, and m is 3,m may be provided, but not limited thereto. The non-inverting input terminal of the operational amplifier U5 is electrically connected to the first terminals of the diodes D14 and D15, and the non-inverting input terminal of the operational amplifier U5 is electrically connected to the reference voltage terminal GND1. The inverting input terminal of the operational amplifier is electrically connected to the second terminals of D14 and D15. Two ends of the parallel 3 resistors R29, R30 and R31 are respectively electrically connected with the inverting input end and the output end of the operational amplifier. The 2 second switches K6, K7 are connected in series with R29, R30, respectively. And determining a closed second switch according to the first current signal, so that a first voltage signal corresponding to a second current signal obtained by amplifying the first current signal is in a range of 0-7V. Wherein the first diode and the second diode are IN4148 diodes. The resistance R29 parameter is: 910/0.1%/25ppm, the parameters of resistance R30 and resistance R31 are: 1.8K/0.1%. The parameters of the current transformer T2 are as follows: 30A/15mA.
In some embodiments, the sampling resistance submodule includes a sampling resistance unit 310, and the amplifier submodule includes an amplification unit 320; the sampling resistance unit is electrically connected with the tested equipment through at least two third switches connected in parallel and used for acquiring a target voltage signal obtained by the direct current passing through the sampling resistance unit when the second sampling module determines a target third switch of the at least two closed third switches according to the direct current signal; and the amplifying unit is used for amplifying the target voltage signal to obtain a second voltage signal.
Fig. 4 shows a schematic structural diagram of a second sampling module according to an embodiment of the present invention. As shown in fig. 4, the sampling resistance unit 310 includes: the second sampling module is used for determining a target third switch in the at least two closed third switches according to the direct current signal, acquiring a voltage signal obtained by the direct current flowing through the resistor, and each group of the at least two groups of resistors is respectively connected in series with one third switch in the at least two third switches; each group of resistors comprises two resistors, and the first ends of the two resistors are respectively electrically connected with the third switches corresponding to the group of resistors. It should be understood that fig. 4 is only an exemplary diagram, two third switches correspond to a single-pole double-throw switch K10, the fixed end of the single-pole double-throw switch K10 is electrically connected to the current output end of the device under test, the moving ends are electrically connected to two sets of resistors, respectively, the first ends of the first set of resistors R9 and R11 are electrically connected to a moving end of the single-pole double-throw switch K10, and the current measurement range of the first set of resistors is 20A; the first ends of the second group of resistors R10 and R12 are electrically connected with the other movable end of the single-pole double-throw switch K10, and the current measuring range of the second group of resistors is 1A. The second end of the resistor R9 is electrically connected with one movable end of the single-pole double-throw switch K12, and the second end of the resistor R10 is electrically connected with the other movable end of the single-pole double-throw switch K12. The second end of the resistor R11 is electrically connected with one moving end of the single-pole double-throw switch K11, and the second end of the resistor R12 is electrically connected with the other moving end of the single-pole double-throw switch K11. The fixed ends of the single-pole double-throw switches K12 and K11 are electrically connected with the amplifying unit. Determining a closed moving end of the switch K10 according to the direct current signal, and closing the moving ends electrically connected with the first group of resistors by the switches K11 and K12 when the closed moving end of the switch K10 is one end electrically connected with the first group of resistors; when the closed movable end of the K10 is one end electrically connected with the second group of resistors, the switches K11 and K12 are both closed. Wherein, the resistances of the sampling resistance units are all high-precision sampling resistances with temperature stability of +/-3 ppm/K. The resistances of the resistors R9 and R10 are 6K Ω, the resistance of the resistor R11 is 25M Ω, and the resistance of the resistor R12 is 0.5 Ω.
In some embodiments, the amplifying unit 320 includes: the non-inverting input end of the operational amplifier is electrically connected with the second end of one resistor in each group of resistors, and the inverting input end of the operational amplifier is electrically connected with the second end of the other resistor in each group of resistors and is used for amplifying the target voltage signal to obtain a second voltage signal; and two ends of the feedback resistor are respectively and electrically connected with the inverting input end and the output end of the operational amplifier. As shown in fig. 4, the inverting input terminal of the operational amplifier is electrically connected to the second terminals of the resistors R9 and R10 through the stationary terminal of the single-pole double-throw switch K12, and the inverting input terminal of the operational amplifier is also electrically connected to the first terminal of the feedback resistor R13; the non-inverting input end of the operational amplifier is electrically connected with the second ends of the resistors R11 and R12 through the fixed end of the single-pole double-throw switch K11. The second end of the feedback resistor R13 is electrically connected to the output end of the operational amplifier.
In some embodiments, the third sampling module comprises: the voltage dividing resistance unit is electrically connected with the tested equipment and is used for dividing the acquired voltage signal to obtain an initial voltage signal; and the amplifying unit is electrically connected with the voltage dividing resistance unit and is used for amplifying the initial voltage signal to obtain a third voltage signal.
Fig. 5 is a schematic structural diagram of a third sampling module according to an embodiment of the present invention. As shown in fig. 5, the voltage-dividing resistance unit 410 includes a first resistance unit, a second resistance unit, a third resistance unit, a fourth resistance unit, and a fifth resistance unit; the first end of the first resistance unit is electrically connected with the first end of the third resistance unit, the second end of the first resistance unit is electrically connected with the first end of the second resistance unit, the second end of the first resistance unit is also electrically connected with the second end of the second resistance unit through a fourth switch, the second end of the second resistance unit is electrically connected with the first end of the fourth resistance unit, the second end of the second resistance unit is also electrically connected with the amplification unit, the second end of the third resistance unit is electrically connected with the second end of the fourth resistance unit, the second end of the third resistance unit is also electrically connected with the first end of the fifth resistance unit, and the second end of the fifth resistance unit is electrically connected with the amplification unit. The first resistance unit comprises a resistor R9, the second resistance unit comprises resistors R10 and R11 which are connected in series, the third resistance unit comprises a resistor R7, and the fourth resistance unit comprises resistors R1, R2, R6 and R12 which are connected in parallel. The fourth switch is K16. The first terminal of the third resistance unit is electrically connected to the reference voltage terminal UGND. Wherein, the resistors R9, R10 and R11 are all resistors with temperature stability of 5ppm/K and time stability of 5ppm/K, and the parameters are as follows: 100K/0.1%/0.75W/5ppm. The parameters of the resistor R1 are: 40K/0.1%/5ppm, the parameters of the resistance R2 are: 6.8K/0.1%/5ppm, the resistance R6 has the parameters: 18K/0.1%/5ppm.
In some embodiments, the voltage dividing resistance unit further includes: the n-1 fifth switches are respectively connected with n-1 resistors in the n resistors included by the fourth resistor unit in series, and the n-1 fifth switches are in one-to-one correspondence with the n-1 resistors; wherein n is an integer not less than 2, and n resistors have different resistances. As shown in fig. 5, the number of the fifth switches is 3, which are K13, K14, and K15; the number of the fourth resistance unit is 4, and the number is R1, R2, R6 and R12. The fifth switch K13 is connected in series with the resistor R6, the corresponding voltage measurement ranges are 300V, K14 is connected in series with the resistor R2, the corresponding measurement ranges are 120V, K15 is connected in series with the resistor R1, and the corresponding current measurement range is 60V.
In some embodiments, the voltage dividing resistance unit further includes: and two ends of the bidirectional rectifying diode are respectively and electrically connected with the second end of the second resistance unit and the second end of the fourth resistance unit. As shown in fig. 5, two ends of the bidirectional rectifying diode D1 are electrically connected to the second end of R11 and the second end of R12, respectively.
In some embodiments, an amplification unit comprises: the non-inverting input end of the operational amplifier is electrically connected with the second end of the second resistor, and the inverting input end of the operational amplifier is electrically connected with the fifth resistor; the two ends of the capacitor are respectively and electrically connected with the inverting input end and the output end of the operational amplifier; the two ends of the parallel b resistors are respectively and electrically connected with the inverting input end and the output end of the operational amplifier; b-1 sixth switches, each sixth switch being connected in series with b resistors in parallel; wherein b is an integer not less than 2, and the resistance values of the parallel b resistors are different. As shown in fig. 5, the number of resistors of the amplifying unit is 2, and R16 and R17 are provided; the number of the sixth switches is 1, and K17. The non-inverting input end of the operational amplifier is electrically connected with the second end of the resistor R11, the inverting input end of the operational amplifier is electrically connected with the second end of the fifth resistor R14, and two ends of the capacitor C5, the resistor R16 and the resistor R17 which are connected in parallel are respectively electrically connected with the inverting input end and the output end of the operational amplifier. The switch K17 is connected in series with the resistor R17. The parameters of the resistor R14 are: 10K/0.1%/10ppm. The capacitance C5 is 330p. The parameters of R16 are: 36K/0.1%/10ppm. The parameter for R17 was 100/0.1%/10ppm.
The embodiment of the utility model provides a sampling circuit module can utilize first sampling module, second sampling module and third sampling module to sample alternating current signal, direct current signal and voltage signal, and the current transformer unit that first sampling module includes has the different coil turns that can select, corresponds different alternating current measuring range, can select according to the alternating current signal, obtains more accurate alternating current sampling result; the second sampling module comprises a sampling resistance unit which is provided with different resistance groups corresponding to different third switches, and the resistance groups correspond to different alternating current measuring ranges and can be selected according to direct current signals to obtain more accurate direct current sampling results; the voltage division resistance unit that the third sampling module includes has the resistance of the fourth resistance unit that different switches correspond, corresponds different voltage sampling scope, can select according to voltage signal, obtains more accurate voltage sampling result.
As described above, only the specific embodiments of the present invention are provided, and those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working processes of the system, the module and the unit described above can refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered by the scope of the present invention.
Claims (11)
1. A sampling circuit module is characterized by comprising a first sampling module, a second sampling module and a third sampling module which are respectively and electrically connected with tested equipment;
the first sampling module is used for collecting the alternating current signal output by the tested equipment to obtain a first voltage signal;
the second sampling module is used for collecting the direct current signal output by the tested device to obtain a second voltage signal;
the third sampling module is used for collecting the alternating current or direct current voltage signal output by the tested equipment to obtain a third voltage signal;
the first voltage signal, the second voltage signal and the third voltage signal are output to a signal processing module in parallel;
wherein the first sampling module comprises:
the current mutual inductance unit is electrically connected with the tested equipment through at least two first switches connected in parallel and used for reducing the alternating current signal according to the number of turns of a coil of the current mutual inductance unit to obtain a first current signal when the first sampling module determines a closed target first switch in the at least two first switches according to the alternating current signal; the at least two first switches correspond to the at least two coil turns of the current mutual inductance unit one by one;
and the amplifying unit is electrically connected with the current mutual inductance unit and is used for amplifying the first current signal to obtain a second current signal and outputting the first voltage signal corresponding to the second current signal.
2. The module of claim 1, wherein the current transformer unit comprises a current transformer, a first diode and a second diode, and the first diode and the second diode are connected in parallel:
the current transformer is electrically connected with the at least two first switches connected in parallel and used for reducing the alternating current according to the number of turns of the coil corresponding to the closed target first switch to obtain a first current signal;
the first diode is electrically connected to the output end of the current transformer according to a first direction and is used for conducting a first current signal in the first direction;
the second diode is electrically connected to the output end of the current transformer according to a second direction and is used for conducting a first current in the second direction, and the first direction is opposite to the second direction.
3. The module of claim 2, wherein the amplifying unit comprises an operational amplifier, m resistors connected in parallel, and m-1 second switches;
the non-inverting input end of the operational amplifier is electrically connected with the first ends of the first diode and the second diode, and the non-inverting input end of the operational amplifier is connected with a reference voltage end;
the inverting input end of the operational amplifier is electrically connected with the second ends of the first diode and the second diode, the output end of the operational amplifier is electrically connected with the first ends of the m resistors connected in parallel, and the second ends of the m resistors connected in parallel are electrically connected with the inverting input end of the operational amplifier;
wherein m is an integer not less than 2, and the m resistors connected in parallel have different resistance values;
the m-1 second switches are connected in series with m-1 resistors of the m resistors connected in parallel respectively, and the m-1 second switches correspond to the m-1 resistors one by one.
4. The module of claim 1, wherein the second sampling module comprises a sampling resistance unit and an amplification unit;
the sampling resistance unit is electrically connected with the tested equipment through at least two third switches connected in parallel and used for acquiring a target voltage signal obtained by the direct current passing through the sampling resistance unit when the second sampling module determines a target third switch of the at least two closed third switches according to the direct current signal;
and the amplifying unit is used for amplifying the target voltage signal to obtain the second voltage signal.
5. The module of claim 4, wherein the sampling resistance unit comprises:
at least two groups of resistors, electrically connected to the at least two third switches, configured to obtain a voltage signal obtained by the dc current flowing through the resistors when the second sampling module determines a target third switch of the at least two closed third switches according to the dc current signal, where each group of resistors of the at least two groups of resistors is connected in series with one third switch of the at least two third switches, respectively;
each group of resistors comprises two resistors, and the first ends of the two resistors are respectively electrically connected with the third switches corresponding to the group of resistors.
6. The module of claim 5, wherein the amplification unit comprises:
the non-inverting input end of the operational amplifier is electrically connected with the second end of one resistor in each group of resistors, and the inverting input end of the operational amplifier is electrically connected with the second end of the other resistor in each group of resistors and is used for amplifying the target voltage signal to obtain a second voltage signal;
and two ends of the feedback resistor are respectively and electrically connected with the inverting input end and the output end of the operational amplifier.
7. The module of claim 1, wherein the third sampling module comprises:
the voltage dividing resistance unit is electrically connected with the tested equipment and is used for dividing the acquired voltage signal to obtain an initial voltage signal;
and the amplifying unit is electrically connected with the voltage dividing resistance unit and is used for amplifying the initial voltage signal to obtain a third voltage signal.
8. The module of claim 7, wherein the voltage-dividing resistance unit includes a first resistance unit, a second resistance unit, a third resistance unit, a fourth resistance unit, and a fifth resistance unit;
the first end of the first resistance unit is electrically connected with the first end of the third resistance unit, the second end of the first resistance unit is electrically connected with the first end of the second resistance unit, the second end of the first resistance unit is electrically connected with the second end of the second resistance unit through a fourth switch, the second end of the second resistance unit is electrically connected with the first end of the fourth resistance unit, the second end of the second resistance unit is electrically connected with the amplification unit, the second end of the third resistance unit is electrically connected with the second end of the fourth resistance unit, the second end of the third resistance unit is electrically connected with the first end of the fifth resistance unit, and the second end of the fifth resistance unit is electrically connected with the amplification unit.
9. The module according to claim 8, wherein the voltage dividing resistance unit further comprises:
the n-1 fifth switches are respectively connected in series with n-1 resistors in the n resistors included in the fourth resistor unit, and the n-1 fifth switches are in one-to-one correspondence with the n-1 resistors;
wherein n is an integer not less than 2, and the n resistors have different resistances.
10. The module according to claim 8, wherein the voltage dividing resistance unit further comprises:
and two ends of the bidirectional rectifier diode are respectively and electrically connected with the second end of the second resistance unit and the second end of the fourth resistance unit.
11. The module of claim 8, wherein the amplification unit comprises:
the non-inverting input end of the operational amplifier is electrically connected with the second end of the second resistor, and the inverting input end of the operational amplifier is electrically connected with the fifth resistor;
the two ends of the capacitor are respectively and electrically connected with the inverting input end and the output end of the operational amplifier;
the two ends of the parallel b resistors are respectively and electrically connected with the inverting input end and the output end of the operational amplifier;
b-1 sixth switches, each of said sixth switches being connected in series with one of said b resistors connected in parallel;
wherein b is an integer not less than 2, and the resistance values of the parallel b resistors are different.
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| CN114325028A (en) * | 2021-12-28 | 2022-04-12 | 北京博电新力电气股份有限公司 | Sampling circuit module |
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| CN114325028A (en) * | 2021-12-28 | 2022-04-12 | 北京博电新力电气股份有限公司 | Sampling circuit module |
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