CN220231922U - Three-phase electric quantity detection circuit and three-phase electric quantity detection device - Google Patents
Three-phase electric quantity detection circuit and three-phase electric quantity detection device Download PDFInfo
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Abstract
The embodiment of the application provides a three-phase electric quantity detection circuit and a three-phase electric quantity detection device. The three-phase electric quantity detection circuit comprises a voltage division circuit, a filter circuit and a processing module. The input end of the voltage dividing circuit is connected with one phase of circuit in the three-phase circuit, the voltage dividing circuit comprises a voltage dividing resistor and a sampling resistor, the voltage dividing resistor and the sampling resistor are connected in series, the voltage dividing circuit is used for converting a first voltage into a second voltage, and the second voltage is smaller than the first voltage; the input end of the processing module is connected between the filter resistor and the filter capacitor, and the filter circuit is used for filtering the second voltage signal; the input end of the processing module is connected with the filter circuit, and the processing module is used for processing and calculating the voltage analog signal of the second voltage, converting the voltage analog signal of the second voltage into a digital signal and outputting the digital signal.
Description
Technical Field
The application relates to the field of circuit detection, in particular to a three-phase electric quantity detection circuit and a three-phase electric quantity detection device.
Background
In a generator set control system, in order to ensure safe, reliable, normal and stable operation of equipment, comprehensive electric quantities such as three-phase alternating current voltage, current, phase, active power, reactive power, voltage harmonic wave, current harmonic wave and the like need to be detected in real time. Therefore, it is extremely important to accurately judge and measure parameters of the three-phase electric quantity. The current three-phase electric phase and frequency detection circuit mainly uses a voltage transformer to convert high voltage into a small current signal with a certain proportion, and then the small current signal is sampled by a sampling resistor to obtain a small voltage signal which can be processed by a chip. In the related art, the defects of the acquisition circuit of the voltage transformer mainly comprise large volume and high cost, and the defects of unbalance of the voltage of the secondary side of the voltage transformer can cause great influence on the acquisition precision of equipment.
Disclosure of Invention
The application provides a three-phase electric quantity detection circuit and three-phase electric quantity detection device to avoid taking place the unbalanced problem of mutual-inductor secondary side voltage, can improve three-phase electric quantity measuring precision from this.
In order to solve the technical problems, the application adopts the following technical scheme:
an embodiment of a first aspect of the present application proposes a three-phase electric quantity detection circuit for detecting an electric quantity of a three-phase circuit of a generator set, the three-phase electric quantity detection circuit including a voltage dividing circuit, a filtering circuit and a processing module. The input end of the voltage dividing circuit is connected with one phase of circuit in the three-phase circuit, the voltage dividing circuit comprises a voltage dividing resistor and a sampling resistor, the voltage dividing resistor and the sampling resistor are connected in series, the voltage dividing circuit is used for converting a first voltage into a second voltage, and the second voltage is smaller than the first voltage; the input end of the processing module is connected between the filter resistor and the filter capacitor, and the filter circuit is used for filtering the second voltage signal; the input end of the processing module is connected with the filter circuit, and the processing module is used for processing and calculating the voltage analog signal of the second voltage, converting the voltage analog signal of the second voltage into a digital signal and outputting the digital signal.
According to the three-phase electric quantity detection circuit, which is used for detecting the electric quantity of the three-phase circuit of the generator set, wherein the input end of the voltage dividing circuit is connected with one phase circuit in the three-phase circuit of the generator set, the first voltage in the three-phase circuit can be converted into the second voltage through the voltage dividing circuit, and the second voltage is smaller than the first voltage, that is, the high-voltage signal in the three-phase circuit can be divided through the voltage dividing circuit and converted into the small-voltage signal. Then, the obtained second voltage signal is subjected to filtering processing by a filtering circuit to obtain a stable voltage signal. And finally, processing the acquired stable second voltage through a processing module, converting a voltage analog signal of the second voltage into a digital signal and outputting the digital signal. According to the three-phase electric quantity detection circuit, the voltage dividing circuit, the filtering circuit and the processing module are adopted, the three-phase electric quantity of the three-phase circuit of the generator set can be measured, the second voltage signal which can be processed by the processing module is obtained through the voltage dividing circuit, then the filtering circuit is used for filtering the second voltage signal, and compared with the mutual inductor acquisition circuit adopted in the related art, the three-phase electric quantity detection circuit in the embodiment can not generate the problem of unbalance of the voltage of the secondary side of the mutual inductor, so that the precision of three-phase electric quantity measurement can be improved.
In addition, the three-phase electric quantity detection circuit according to the embodiment of the application may further have the following technical features:
in some embodiments of the present application, the three-phase circuit includes a first phase circuit, a second phase circuit, a third phase circuit and a fourth phase circuit, the number of the voltage dividing circuits is four, wherein three input ends of the voltage dividing circuits are respectively connected with the first phase circuit, the second phase circuit and the third phase circuit, another input end of the voltage dividing circuit is connected with the fourth phase circuit, and the number of the filter circuits is four, and four input ends of the filter circuits are connected with four output ends of the voltage dividing circuits.
In some embodiments of the present application, the number of the voltage dividing resistors is a plurality, the plurality of the voltage dividing resistors are connected in series, and each of the voltage dividing resistors has the same resistance, and the number of the voltage dividing resistors and the number of the sampling resistors connected to the first phase circuit, the second phase circuit and the third phase circuit are the same as the number of the voltage dividing resistors and the number of the sampling resistors connected to the fourth phase circuit.
In some embodiments of the present application, the number of the voltage dividing resistors is greater than or equal to 6 and less than or equal to 8, the resistance value of the voltage dividing resistor is greater than or equal to 1M and less than or equal to 2M, and the resistance value of the sampling resistor is greater than or equal to 500 ohms and less than or equal to 2000 ohms.
In some embodiments of the present application, the three-phase circuit includes a first phase circuit, a second phase circuit and a third phase circuit, the number of the voltage dividing circuits and the number of the filtering circuits are three, the input ends of the three voltage dividing circuits are respectively connected with the first phase circuit, the second phase circuit and the third phase circuit, and the input ends of the three filtering circuits are respectively connected with the output ends of the three voltage dividing circuits.
In some embodiments of the present application, the number of the voltage dividing resistors is a plurality, the plurality of the voltage dividing resistors are connected in series, and the resistance value of each of the voltage dividing resistors is the same.
In some embodiments of the present application, the number of the voltage dividing resistors is greater than or equal to 6 and less than or equal to 8, the resistance value of the voltage dividing resistor is greater than or equal to 1M and less than or equal to 2M, and the resistance value of the sampling resistor is greater than or equal to 500 ohms and less than or equal to 2000 ohms.
In some embodiments of the present application, the voltage value of the second voltage is greater than or equal to 0.1V and less than or equal to 0.2V.
In some embodiments of the present application, the processing module includes an electric quantity acquisition module and an analog-to-digital converter, where the electric quantity acquisition module is configured to perform a processing operation on a voltage analog signal of the second voltage, and the analog-to-digital converter is configured to convert the voltage analog signal into a digital signal and output the digital signal.
An embodiment of a second aspect of the present application proposes a three-phase power detection apparatus comprising a three-phase power detection circuit according to any one of the embodiments of the first aspect.
According to the three-phase electric quantity detection device in the embodiments of the present application, since the three-phase electric quantity detection device includes the three-phase electric quantity detection circuit in any embodiment of the first aspect, the three-phase electric quantity detection device also has the beneficial effects of any embodiment of the first aspect, and the description thereof is omitted herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly introduce the drawings that are required to be used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other embodiments may also be obtained according to these drawings to those skilled in the art.
Fig. 1 is a schematic circuit diagram of a three-phase power detection circuit according to an embodiment of the present application;
fig. 2 is a block diagram of a three-phase power detection circuit in an embodiment of the present application.
The reference numerals are as follows:
10 a first phase circuit; a 20 second phase circuit; 30 a third phase circuit; a fourth phase circuit 40;
a 100 voltage dividing circuit; 110 voltage dividing resistor; 120 sampling resistance; a 200 filter circuit; a 210 filter resistor; 220 a filter capacitor; 300 processing modules.
Detailed Description
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other embodiments may be obtained according to these drawings to those of ordinary skill in the art.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, a person of ordinary skill in the art would be able to obtain all other embodiments based on the disclosure herein, which are within the scope of the disclosure herein.
As shown in fig. 1 and 2, an embodiment of the first aspect of the present application proposes a three-phase power detection circuit for detecting power of a three-phase circuit of a generator set, where the three-phase power detection circuit includes a voltage division circuit 100, a filtering circuit 200, and a processing module 300. The input end of the voltage dividing circuit 100 is connected with one phase of the three-phase circuits, the voltage dividing circuit 100 comprises a voltage dividing resistor 110 and a sampling resistor 120, the voltage dividing resistor 110 and the sampling resistor 120 are connected in series, the voltage dividing circuit 100 is used for converting a first voltage into a second voltage, and the second voltage is smaller than the first voltage; the input end of the filter circuit 200 is connected between the voltage dividing resistor 110 and the sampling resistor 120, the filter circuit 200 comprises a filter resistor 210 and a filter capacitor 220, the filter resistor 210 and the filter capacitor 220 are connected in series, the input end of the processing module 300 is connected between the filter resistor 210 and the filter capacitor 220, and the filter circuit 200 is used for filtering the second voltage signal; the input end of the processing module 300 is connected to the filter circuit 200, and the processing module 300 is configured to process the voltage analog signal of the second voltage, convert the voltage analog signal of the second voltage into a digital signal, and output the digital signal.
Referring to fig. 2, according to the three-phase power detection circuit in the embodiment of the present application, the input end of the voltage division circuit 100 is connected to one of the three-phase circuits of the generator set, and the voltage division circuit 100 can convert a first voltage in the three-phase circuit into a second voltage, which is smaller than the first voltage, that is, the voltage division circuit 100 can divide a high-voltage signal in the three-phase circuit into a small-voltage signal. Then, the obtained second voltage signal is subjected to a filtering process by the filtering circuit 200 to obtain a stable voltage signal. And finally, the acquired stable second voltage is processed by the processing module 300, and a voltage analog signal of the second voltage is converted into a digital signal and output. In this embodiment, the filter circuit 200 includes a filter capacitor 220 for filtering, and a filter resistor 210 for discharging, and by setting the filter resistor 210, the current flowing through the processing module 300 can be reduced, so that the current flowing through the processing module 300 is within a preset range, and errors of measurement caused by excessive current are avoided. In summary, the voltage division circuit 100, the filtering circuit 200 and the processing module 300 are adopted in the embodiment, so that three-phase electric quantity measurement can be performed on a three-phase circuit of a generator set, a second voltage signal which can be processed by the processing module 300 is obtained through the voltage division circuit 100, and then the second voltage signal is filtered through the filtering circuit 200.
As shown in fig. 2, in some embodiments of the present application, the three-phase circuit includes a first phase circuit 10, a second phase circuit 20, a third phase circuit 30 and a fourth phase circuit 40, the number of the voltage dividing circuits 100 is four, wherein the input ends of three voltage dividing circuits 100 are respectively connected with the first phase circuit 10, the second phase circuit 20 and the third phase circuit 30, the input end of another voltage dividing circuit 100 is connected with the fourth phase circuit 40, the number of the filter circuits 200 is four, and the input ends of four filter circuits 200 are connected with the output ends of four voltage dividing circuits 100. In this embodiment, the three-phase circuit of the generator set is a three-phase four-wire circuit, which includes a first phase circuit 10, a second phase circuit 20, a third phase circuit 30, and a fourth phase circuit 40, where the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30 may be an a-phase circuit, a B-phase circuit, and a C-phase circuit in fig. 2, respectively, these three phase circuits may be collectively referred to as a live wire or a phase wire, the fourth phase circuit 40 is an N-wire in fig. 2, and the fourth phase circuit 40 may be a neutral wire or a neutral wire. In this embodiment, three phase lines of the three-phase four-wire circuit are respectively connected to the voltage dividing circuit 100 and the filtering circuit 200, and the voltage dividing circuit 100 divides the first voltage signal of the phase line to obtain the second voltage signal that can be processed by the processing module 300. In addition, the voltage division circuit 100 and the filter circuit 200 are also connected to the zero line in the three-phase four-wire circuit, and by connecting the voltage division circuit 100 and the filter circuit 200 to the zero line, signal interference caused by grounding of the zero line can be avoided, and the accuracy of three-phase electric quantity detection can be improved.
In some embodiments of the present application, the number of the voltage dividing resistors 110 is plural, the plurality of voltage dividing resistors 110 are connected in series, and the resistance value of each voltage dividing resistor 110 is the same, and the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30 is the same as the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the fourth phase circuit 40. In the present embodiment, the number of the voltage dividing resistors 110 may be plural, for example, the number of the voltage dividing resistors 110 may be 4, 5, 6, 7, 8 or more, and is not particularly limited here.
Referring to fig. 1, in a specific embodiment of the present application, the voltage dividing resistor 110 is R1, R2, R3, R4, R5, R6, R7, and R8, the sampling resistor 120 is R9, the first voltage signal in the three-phase circuit is divided by R1 to R8, then the first voltage signal is divided by R9, the first voltage is denoted UA, the divided second voltage is denoted UA, when the resistance values of R1 to R8 are equal, the resistance values of R1 to R8 are denoted R, the resistance value of R9 is denoted R, and the value of UA is:
ua=r/(8×r+r) ×ua; (equation I)
As can be seen from the above equation one, as the resistance R of the voltage dividing resistor 110 is larger, the resistance of the sampling resistor 120R is smaller, and the voltage value of the second voltage is also smaller. When the number of resistances of the voltage dividing resistor 110 is larger, the voltage value of the second voltage is also smaller. Therefore, the number of resistances and the resistance values of the sampling resistor 120 and the voltage dividing resistor 110 can be designed accordingly according to specific requirements.
Referring to fig. 1, in the present embodiment, a filter capacitor 220 in a filter circuit 200 connected to a first phase circuit 10 is C1, a filter resistor 210 is R19, a filter capacitor 220 in a filter circuit 200 connected to a second phase circuit 20 is C2, and a filter resistor 210 is R20. The filter resistor 210 mainly plays a role of discharging current so that the current flowing into the processing module 300 is within a preset range.
Referring to fig. 1, in the present embodiment, the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the first phase circuit 10 is the same as the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the fourth phase circuit 40, the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the second phase circuit 20 is the same as the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the fourth phase circuit 40, and the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the third phase circuit 30 is the same as the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the fourth phase circuit 40. Further, the resistance value of each of the voltage dividing resistors 110 is the same, and by making the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30 the same as the number of the voltage dividing resistors 110 and the sampling resistors 120 connected to the fourth phase circuit 40, the disturbance caused by the direct grounding of the fourth phase circuit 40 can be avoided by such a symmetrical design.
In some embodiments of the present application, the number of the voltage dividing resistors 110 is greater than or equal to 6 and less than or equal to 8, the resistance value of the voltage dividing resistor 110 is greater than or equal to 1M and less than or equal to 2M, and the resistance value of the sampling resistor 120 is greater than or equal to 500 ohms and less than or equal to 2000 ohms. In this embodiment, the number of the voltage dividing resistors 110 is greater than or equal to 6 and less than or equal to 8, so that the temperature rise caused by the overlarge resistance value of the voltage dividing resistors 110 is avoided due to the overlarge number of the voltage dividing resistors 110, and the circuit is complicated due to the overlarge number of the voltage dividing resistors 110. The resistance value of the voltage dividing resistor 110 is greater than or equal to 1M and less than or equal to 2M, where 1M is equal to 1000 kiloohms, and the resistance value of the sampling resistor 120 is greater than or equal to 500 ohms and less than or equal to 2000 ohms, and preferably, the resistance value of the sampling resistor 120 is 1000 ohms.
In some embodiments of the present application, the three-phase circuit includes a first phase circuit 10, a second phase circuit 20, and a third phase circuit 30, the number of the voltage dividing circuits 100 and the filtering circuits 200 is three, the input ends of the three voltage dividing circuits 100 are respectively connected with the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30, and the input ends of the three filtering circuits 200 are respectively connected with the output ends of the three voltage dividing circuits 100. In this embodiment, the three-phase circuit of the generator set is a three-phase three-wire circuit, which includes a first phase circuit 10, a second phase circuit 20, and a third phase circuit 30, and the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30 may be collectively referred to as a hot wire or a phase wire. In the present embodiment, the voltage dividing circuit 100 and the filter circuit 200 are connected to the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30 to detect the electric quantity of the first phase circuit 10, the second phase circuit 20, and the third phase circuit 30.
In some embodiments of the present application, the number of the voltage dividing resistors 110 is plural, the plurality of voltage dividing resistors 110 are connected in series, and the resistance of each voltage dividing resistor 110 is the same. In the present embodiment, the number of the voltage dividing resistors 110 may be plural, for example, the number of the voltage dividing resistors 110 may be 4, 5, 6, 7, 8 or more, and is not particularly limited here. In this embodiment, the plurality of voltage dividing resistors 110 are connected in series, and the resistance of each voltage dividing resistor 110 is the same, so that the problem of inaccurate detection caused by different resistance of the voltage dividing resistors 110 can be avoided.
In some embodiments of the present application, the number of the voltage dividing resistors 110 is greater than or equal to 6 and less than or equal to 8, the resistance value of the voltage dividing resistor 110 is greater than or equal to 1M and less than or equal to 2M, and the resistance value of the sampling resistor 120 is greater than or equal to 500 ohms and less than or equal to 2000 ohms. In this embodiment, the number of the voltage dividing resistors 110 is greater than or equal to 6 and less than or equal to 8, so that the temperature rise caused by the overlarge resistance value of the voltage dividing resistors 110 is avoided due to the overlarge number of the voltage dividing resistors 110, and the circuit is complicated due to the overlarge number of the voltage dividing resistors 110. The resistance value of the voltage dividing resistor 110 is greater than or equal to 1M and less than or equal to 2M, where 1M is equal to 1000 kiloohms, and the resistance value of the sampling resistor 120 is greater than or equal to 500 ohms and less than or equal to 2000 ohms, and preferably, the resistance value of the sampling resistor 120 is 1000 ohms.
In some embodiments of the present application, the voltage value of the second voltage is greater than or equal to 0.1V and less than or equal to 0.2V. In this embodiment, the first voltage in the three-phase circuit needs to be divided into a second voltage value with a smaller value, and the voltage value of the divided second voltage is greater than or equal to 0.1V and less than or equal to 0.2V.
In some embodiments of the present application, the processing module 300 includes a power acquisition module for performing a processing operation on a voltage analog signal of the second voltage, and an analog-to-digital converter for converting the voltage analog signal into a digital signal and outputting the digital signal. In this embodiment, the electric quantity collection module and the analog-to-digital converter may be integrated into one chip, or may be two independent devices, which is not particularly limited herein. The electric quantity acquisition module is used for carrying out processing operation on the voltage analog signal of the second voltage, and the analog-to-digital converter is used for converting the voltage analog signal into a digital signal and outputting the digital signal. In a specific embodiment of the present application, the processing module 300 may include a chip of type RN8302B, which can be used for power detection of a three-phase circuit.
An embodiment of a second aspect of the present application proposes a three-phase power detection apparatus comprising a three-phase power detection circuit according to any one of the embodiments of the first aspect.
According to the three-phase electric quantity detection device in the embodiment of the application, since the three-phase electric quantity detection device comprises the three-phase electric quantity detection circuit in any embodiment of the first aspect, the three-phase electric quantity detection device also has the beneficial effects of any embodiment of the first aspect. Specifically, according to the three-phase electric quantity detection circuit in the embodiment of the present application, the three-phase electric quantity detection circuit is used for detecting electric quantity of three-phase circuits of a generator set, wherein an input end of the voltage division circuit 100 is connected to one of the three-phase circuits of the generator set, and through the voltage division circuit 100, a first voltage in the three-phase circuits can be converted into a second voltage, and the second voltage is smaller than the first voltage, that is, a high-voltage signal in the three-phase circuits can be divided by the voltage division circuit 100 and converted into a small-voltage signal. Then, the obtained second voltage signal is subjected to a filtering process by the filtering circuit 200 to obtain a stable voltage signal. And finally, the acquired stable second voltage is processed by the processing module 300, and a voltage analog signal of the second voltage is converted into a digital signal and output. In this embodiment, by adopting the voltage division circuit 100, the filter circuit 200 and the processing module 300, three-phase electric quantity measurement can be performed on the three-phase circuit of the generator set, the voltage division circuit 100 obtains the second voltage signal which can be processed by the processing module 300, and then the filter circuit 200 filters the second voltage signal.
While the application has been described with reference to a few specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the utility model without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiments disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A three-phase power detection circuit for detecting power of a three-phase circuit of a generator set, the three-phase power detection circuit comprising:
the input end of the voltage dividing circuit is connected with one phase of circuit in the three-phase circuit, the voltage dividing circuit comprises a voltage dividing resistor and a sampling resistor, the voltage dividing resistor and the sampling resistor are connected in series, the voltage dividing circuit is used for converting a first voltage into a second voltage, and the second voltage is smaller than the first voltage;
the input end of the filter circuit is connected between the voltage dividing resistor and the sampling resistor, the filter circuit comprises a filter resistor and a filter capacitor, the filter resistor is connected with the filter capacitor in series, and the filter circuit is used for filtering the second voltage signal;
the input end of the processing module is connected with the filter circuit, the input end of the processing module is connected between the filter resistor and the filter capacitor, and the processing module is used for processing and calculating the voltage analog signal of the second voltage and converting the voltage analog signal of the second voltage into a digital signal and outputting the digital signal.
2. The three-phase power detection circuit according to claim 1, wherein the three-phase circuit includes a first phase circuit, a second phase circuit, a third phase circuit and a fourth phase circuit, the number of the voltage dividing circuits is four, wherein the input terminals of three of the voltage dividing circuits are respectively connected with the first phase circuit, the second phase circuit and the third phase circuit, the input terminal of another one of the voltage dividing circuits is connected with the fourth phase circuit, and the number of the filter circuits is four, and the input terminals of four of the filter circuits are connected with the output terminals of four of the voltage dividing circuits.
3. The three-phase electric quantity detection circuit according to claim 2, wherein the number of the voltage dividing resistors is plural, the plural voltage dividing resistors are connected in series, and each of the voltage dividing resistors has the same resistance value, and the number of the voltage dividing resistors and the sampling resistors connected to the first phase circuit, the second phase circuit, and the third phase circuit is the same as the number of the voltage dividing resistors and the sampling resistors connected to the fourth phase circuit.
4. The three-phase electric quantity detection circuit according to claim 3, wherein the number of the voltage dividing resistors is 6 or more and 8 or less, the resistance value of the voltage dividing resistor is 1M or more and 2M or less, and the resistance value of the sampling resistor is 500 ohm or more and 2000 ohm or less.
5. The three-phase power detection circuit according to claim 1, wherein the three-phase circuit includes a first phase circuit, a second phase circuit and a third phase circuit, the number of the voltage dividing circuits and the number of the filtering circuits are three, the input ends of the three voltage dividing circuits are respectively connected with the first phase circuit, the second phase circuit and the third phase circuit, and the input ends of the three filtering circuits are respectively connected with the output ends of the three voltage dividing circuits.
6. The three-phase power detection circuit according to claim 5, wherein the number of the voltage dividing resistors is plural, the plural voltage dividing resistors are connected in series, and the resistance value of each of the voltage dividing resistors is the same.
7. The three-phase power detection circuit according to claim 6, wherein the number of the voltage dividing resistors is 6 or more and 8 or less, the resistance value of the voltage dividing resistor is 1M or more and 2M or less, and the resistance value of the sampling resistor is 500 ohms or more and 2000 ohms or less.
8. The three-phase electric quantity detection circuit according to any one of claims 1 to 7, characterized in that a voltage value of the second voltage is greater than or equal to 0.1V and less than or equal to 0.2V.
9. The three-phase power detection circuit according to any one of claims 1 to 7, wherein the processing module includes a power acquisition module for performing a processing operation on a voltage analog signal of the second voltage, and an analog-to-digital converter for converting the voltage analog signal into a digital signal and outputting the digital signal.
10. A three-phase power detection apparatus characterized by comprising the three-phase power detection circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320791717.7U CN220231922U (en) | 2023-04-11 | 2023-04-11 | Three-phase electric quantity detection circuit and three-phase electric quantity detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320791717.7U CN220231922U (en) | 2023-04-11 | 2023-04-11 | Three-phase electric quantity detection circuit and three-phase electric quantity detection device |
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