CN218497020U - Current sampling circuit and current sampling system - Google Patents
Current sampling circuit and current sampling system Download PDFInfo
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- CN218497020U CN218497020U CN202222217637.9U CN202222217637U CN218497020U CN 218497020 U CN218497020 U CN 218497020U CN 202222217637 U CN202222217637 U CN 202222217637U CN 218497020 U CN218497020 U CN 218497020U
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Abstract
The utility model discloses a current sampling circuit and current sampling system. The current sampling circuit comprises a conductive piece, a first sampling module, a second sampling module, a main control module, an isolation module and a signal transceiver. The conductive piece is electrically connected with the equipment to be tested, and the equipment to be tested generates an initial current signal; the first sampling module generates a shunt voltage signal according to the initial current signal, and the second sampling module generates a magnetic induction voltage signal according to the initial current signal; the master control module compares the shunt voltage signal with the magnetic induction voltage signal to obtain a current group or a current group and an alarm signal; the isolation module carries out signal isolation operation on the current group or the current group and the alarm signal; and the signal transceiver carries out signal output operation according to the current group or the current group and the alarm signal. The current sampling circuit can simultaneously realize shunt current sampling and magnetic induction current sampling.
Description
Technical Field
The utility model belongs to the technical field of the current sampling technique and specifically relates to a current sampling circuit and current sampling system are related to.
Background
At present, when current detection is carried out on the functional safety level C/D of equipment such as each part of a new energy automobile, two independent current sampling circuits are needed to be adopted for sampling the current of the equipment. The two independent current sampling circuits are a current divider current sampling circuit and a Hall sensor current sampling circuit respectively.
In the related art, synchronous sampling cannot be realized by the current sampling circuit of the current divider and the current sampling circuit of the hall sensor, and the obtained sampling current is poor in precision.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a current sampling circuit can realize shunt current sampling and magnetic induction current sampling simultaneously to improve current measurement's precision.
The utility model discloses still provide a current sampling system who has above-mentioned current sampling circuit.
According to the utility model discloses a current sampling circuit of first aspect embodiment is applied to the equipment that awaits measuring, current sampling circuit includes:
the conductive piece is used for being electrically connected with the equipment to be tested; the device to be tested is used for generating an initial current signal;
the first sampling module is used for being connected with the conductive piece and generating a shunt voltage signal according to the initial current signal;
the second sampling module is used for being connected with the conductive piece and generating a magnetic induction voltage signal according to the initial current signal;
the main control module is used for being electrically connected with the first sampling module and the second sampling module respectively, and the main control module is used for carrying out comparison operation according to a shunt voltage signal and a magnetic induction voltage signal to obtain a current group; or, obtaining the current group and an alarm signal; wherein the current set comprises a first current sample signal and a second current sample signal;
the isolation module is used for being electrically connected with the main control module and used for carrying out signal isolation operation on the current group or carrying out signal isolation operation on the current group and the alarm signal;
a signal transceiver for electrically connecting with the isolation module, the signal transceiver for transmitting the set of currents; or, for transmitting said set of currents and said alarm signal.
According to the utility model discloses current sampling circuit has following beneficial effect at least: the equipment to be tested generates an initial current signal, and the first sampling module and the second sampling module respectively receive the initial current signal through the conductive parts. The first sampling module generates a shunt voltage signal according to the initial current signal, and the second sampling module generates a magnetic induction voltage signal according to the initial current signal. The main control module receives the shunt voltage signal and the magnetic induction voltage signal, and compares the shunt voltage signal with the magnetic induction voltage signal to obtain a current group or a current group and an alarm signal. The isolation module performs signal isolation operation on the current group or performs signal isolation operation on the current group and the alarm signal. And finally, outputting the current group or outputting the current group and the alarm signal through the signal transceiver. The current sampling circuit can simultaneously realize shunt current sampling and magnetic induction current sampling, and two current sampling signals generated by the main control module are isolated through the isolation module, so that the current measurement precision is improved.
According to some embodiments of the invention, the first sampling module comprises:
the two ends of the first sampling piece are connected with the conductive piece, and the first sampling piece is used for generating a shunt voltage signal according to the initial current signal;
the first operational amplifier is used for being electrically connected with the first sampling piece and the main control module respectively, and the first operational amplifier is used for carrying out signal amplification operation on the shunt voltage signal.
According to some embodiments of the invention, the material of the first sample piece is a manganese copper alloy.
According to some embodiments of the invention, the second sampling module comprises:
the second sampling piece is sleeved on the conductive piece and used for generating a magnetic induction signal according to the initial current signal, and an opening is formed in the second sampling piece;
the Hall sensor is arranged at the opening end of the second sampling piece and used for generating a magnetic induction voltage signal according to the magnetic induction signal;
and the second operational amplifier is used for being electrically connected with the Hall sensor and the main control module respectively, and is used for carrying out signal amplification operation on the magnetic induction voltage signal.
According to some embodiments of the present invention, the current sampling circuit further comprises:
the power supply processing module is used for being electrically connected with an external power supply, the main control module, the isolation module, the signal transceiver, the first operational amplifier and the second operational amplifier respectively; the external power supply is used for providing power supply signals, and the power supply processing module is used for carrying out voltage adjustment processing on the power supply signals.
According to some embodiments of the invention, the power supply processing module comprises:
the power supply isolator is used for being electrically connected with the external power supply, the main control module, the isolation module, the first operational amplifier and the second operational amplifier respectively, and the power supply isolator is used for generating a first power supply electronic signal according to the power supply signal; the first power supply electronic signal is used for supplying power to the main control module, the isolation module, the first operational amplifier and the second operational amplifier;
the voltage stabilizer is used for being electrically connected with the external power supply and the signal transceiver respectively, and the voltage stabilizer is used for generating a second power supply electronic signal according to the power supply signal; wherein the second supply electronic signal is used to power the signal transceiver.
According to some embodiments of the utility model, electrically conductive piece is the copper bar.
According to the utility model discloses a current sampling system of second aspect embodiment includes:
according to the present invention, a current sampling circuit according to the above first aspect embodiment;
the display module is electrically connected with the signal transceiver and used for performing display operation according to the current set; or, performing display operation according to the current group and the alarm signal.
According to the utility model discloses current sampling system has following beneficial effect at least: by adopting the current sampling circuit, the current sampling system can realize shunt current sampling and magnetic induction current sampling simultaneously, and two current sampling signals generated by the main control module are isolated by the isolation module, so that the current measurement precision is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a block diagram of a specific embodiment of the current sampling circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the current sampling circuit of the present invention;
fig. 3 is a block diagram of a specific embodiment of the current sampling system of the present invention.
Reference numerals:
the device comprises a conductive member 100, a first sampling module 200, a second sampling module 300, a main control module 400, an isolation module 500, a signal transceiver 600, a power supply processing module 700, a current sampling circuit 800 and a display module 900.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means is one or more, a plurality of means is two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the following embodiments, devices such as parts of a new energy vehicle are exemplified as devices to be tested. It should be understood that any device that requires sampling of a current signal is within the scope of the embodiments of the present application.
As shown in fig. 1, the embodiment of the utility model provides a current sampling circuit, it is applied to the equipment that awaits measuring, and this current sampling circuit includes: the device comprises a conductive member 100, a first sampling module 200, a second sampling module 300, a main control module 400, an isolation module 500 and a signal transceiver 600. The first sampling module 200 is used for connecting with the conductive member 100, and the first sampling module 200 is used for generating a shunt voltage signal according to the initial current signal; the second sampling module 300 is configured to be connected to the conductive member 100, and the second sampling module 300 is configured to generate a magnetic induction voltage signal according to the initial current signal; the main control module 400 is used for being electrically connected with the first sampling module 200 and the second sampling module 300 respectively, and the main control module 400 is used for performing comparison operation according to the shunt voltage signal and the magnetic induction voltage signal to obtain a current group, or obtain the current group and an alarm signal; wherein the current group comprises a first current sampling signal and a second current sampling signal; the isolation module 500 is used for electrically connecting with the main control module 400, and the isolation module 500 is used for performing signal isolation operation on the current group or performing signal isolation operation on the current group and the alarm signal; the signal transceiver 600 is used to electrically connect with the isolation module 500, and the signal transceiver 600 is used to transmit a current set, or, to transmit a current set and an alarm signal.
Specifically, the main control module 400 is electrically connected to the first sampling module 200, the second sampling module 300, and the isolation module 500, respectively. The device to be tested generates an initial current signal, which is a direct current signal. The conductive device 100 is connected to a device to be tested and receives an initial current signal. The first sampling module 200 converts the initial current signal into a shunt voltage signal, and the second sampling module 300 converts the initial current signal into a magnetic induction voltage signal. The main control module 400 may include a single chip microcomputer (i.e., U1 in fig. 2) having an analog-to-digital conversion function, or a single chip microcomputer and an analog-to-digital converter. Referring to fig. 2, taking the main control module 400 as a single chip U1 with an analog-to-digital conversion function as an example, the single chip U1 receives a shunt voltage signal through an ADC1 port and receives a magnetic induction voltage signal through an ADC2 port.
After receiving the shunt voltage signal and the magnetic induction voltage signal, the main control module 400 performs a conversion operation on the shunt voltage signal and the magnetic induction voltage signal, converts the shunt voltage signal into a shunt current signal, and converts the magnetic induction voltage signal into a magnetic induction current signal. The current magnitude of the shunt current signal is set as I1, the current magnitude of the magnetic induction current signal is set as I2, the threshold value of the preset current magnitude is set as X1, the current change rate of the shunt current signal is set as a, the current change rate of the magnetic induction current signal is set as b, and the threshold value of the preset current magnitude change rate is set as X2.
When (I1-I2) < X1 and (a-b) < X2 are satisfied, indicating that the current of the device to be tested is normal, the main control module 400 outputs a current group, assigns the current value of the first current sampling signal to I1, and assigns the current value of the second current sampling signal to I2. After receiving the current group, the isolation module 500 performs signal isolation operation on the current group to improve the stability and accuracy of the first current sampling signal and the second current sampling signal. Finally, the signal transceiver 600 outputs the current set in the form of a digital communication signal.
And when the current value of the equipment to be tested is larger than or equal to X1 or (I1-I2) < X1 and (a-b) gtoreqX 2, indicating that the current of the equipment to be tested is abnormal, outputting a current group and an alarm signal, assigning the current value of the first current sampling signal to be I1, and assigning the current value of the second current sampling signal to be I1. After receiving the current group, the isolation module 500 performs signal isolation operation on the current group and the alarm signal to improve the stability and accuracy of the first current sampling signal, the second current sampling signal and the alarm signal. Finally, the signal transceiver 600 outputs the current set and the alarm signal in the form of a digital communication signal.
According to the utility model discloses current sampling circuit, first sampling module 200, second sampling module 300 receive initial current signal through electrically conductive piece 100 respectively. The first sampling module 200 generates a shunt voltage signal according to the initial current signal, and the second sampling module 300 generates a magnetic induction voltage signal according to the initial current signal. The main control module 400 receives the shunt voltage signal and the magnetic induction voltage signal, and compares the shunt voltage signal and the magnetic induction voltage signal to obtain a current group, or a current group and an alarm signal. The isolation module 500 performs a signal isolation operation on the current group, or performs a signal isolation operation on the current group and the alarm signal. Finally, the current set is output through the signal transceiver 600, or the current set and the alarm signal are output. Therefore, the current sampling circuit of the present embodiment can simultaneously realize shunt current sampling and magnetic induction current sampling, and the two current sampling signals generated by the main control module 400 are signal-isolated by the isolation module 500, so that the accuracy of current measurement is improved.
As shown in fig. 2, in some embodiments of the present invention, the first sampling module 200 includes: a first sampling part C1 and a first operational amplifier OP1. Two ends of the first sampling piece C1 are respectively connected to the conductive pieces 100, and the first sampling piece C1 is configured to generate a shunt voltage signal according to the initial current signal; the first operational amplifier OP1 is used for being electrically connected with the first sampling piece C1 and the main control module 400, respectively, and the first operational amplifier OP1 is used for performing signal amplification operation on the shunt voltage signal.
Specifically, both ends of the first sampling member C1 may be connected to the conductive members 100 by welding. After the device to be tested generates the initial current signal, the first sampling element C1 receives the initial current signal through the conductive element 100, and converts the initial current signal into a shunt voltage signal. The first operational amplifier OP1 performs a signal amplification operation on the shunt voltage signal, so that the main control module 400 can identify the shunt voltage signal and process the shunt voltage signal.
In some embodiments of the present invention, the material of the first sample C1 is a manganese-copper alloy.
Particularly, the manganese-copper alloy is an ultrahigh pressure sensitive material, and has the characteristics of high sensitivity, quick response, good linearity, small resistance temperature coefficient and the like. The first sampling piece C1 adopts manganese-copper alloy, so that high-precision shunt current sampling can be realized.
As shown in fig. 2, in some embodiments of the present invention, the second sampling module 300 includes: a second sampling piece C2, a Hall sensor C3 and a second operational amplifier OP2. The second sampling piece C2 is sleeved on the conductive piece 100, the second sampling piece C2 is used for generating a magnetic induction signal according to the initial current signal, and the second sampling piece C2 is provided with an opening; the Hall sensor C3 is arranged at the opening end of the second sampling piece C2, and the Hall sensor C3 is used for generating a magnetic induction voltage signal according to the magnetic induction signal; the second operational amplifier OP2 is used for being electrically connected with the hall sensor C3 and the main control module 400, respectively, and the second operational amplifier OP2 is used for performing signal amplification operation on the magnetic induction voltage signal.
Specifically, the second sampling member C2 may be configured as a ring or other shape capable of being sleeved on the outer surface of the conductive member. The initial current signal flowing through the conductive member 100 generates a magnetic field in the circumferential direction of the conductive member 100, and the second sampling member C2 collects a magnetic induction signal in the magnetic field. The second sampling piece C2 collects the magnetic induction signal at the opening end of the second sampling piece C2, and the Hall sensor C3 arranged at the opening end converts the magnetic induction signal into a magnetic induction voltage signal. The second operational amplifier OP2 performs a signal amplification operation on the magnetic induction voltage signal, so that the main control module 400 can recognize the magnetic induction voltage signal and process the magnetic induction voltage signal.
As shown in fig. 2, in some embodiments of the present invention, the current sampling circuit further includes a power supply processing module 700. The power supply processing module 700 is used for being electrically connected with an external power supply VCC, the main control module 400, the isolation module 500, the signal transceiver 600, the first operational amplifier OP1 and the second operational amplifier OP2 respectively; the external power source VCC is used for providing a power supply signal, and the power supply processing module is used for adjusting the voltage of the power supply signal.
Specifically, after receiving the power supply signal provided by the external power VCC, the power supply processing module 700 adjusts the voltage value of the power supply signal, so that the power supply signal can respectively satisfy the power supply requirements of the main control module 400, the isolation module 500, the signal transceiver 600, the first operational amplifier OP1, and the second operational amplifier OP2.
As shown in fig. 2, in some embodiments of the present invention, the power supply processing module 700 includes: power isolator U2, stabiliser U3. The power supply isolator U2 is used for being electrically connected with an external power supply VCC, the main control module 400, the isolation module 500, the first operational amplifier OP1 and the second operational amplifier OP2 respectively, and the power supply isolator U2 is used for generating a first power supply electronic signal according to a power supply signal; the first power supply electronic signal is used for supplying power to the main control module 400, the isolation module 500, the first operational amplifier OP1 and the second operational amplifier OP 2; the voltage stabilizer U3 is used for being electrically connected with an external power source VCC and the signal transceiver 600, respectively, and the voltage stabilizer U3 is used for generating a second power supply electronic signal according to the power supply signal; wherein the second power electronic signal is used to power the signal transceiver 600.
Specifically, the external power source VCC is electrically connected to the power isolator U2 and the voltage regulator U3, respectively, and the power isolator U2 and the voltage regulator U3 receive the power supply signal provided by the external power source VCC, respectively. The power isolator U2 performs isolation conversion on the power supply signal, so that the power supply signal is converted into a first power supply electronic signal, and the first power supply electronic signal can supply power to the main control module 400, the isolation module 500, the first operational amplifier OP1, and the second operational amplifier OP2. The voltage regulator U3 performs a voltage-stabilizing operation on the power supply signal, so that the power supply signal is converted into a second power supply electronic signal, which can supply power to the signal transceiver 600.
In some embodiments of the present invention, the conductive member is a copper bar.
Specifically, the copper bar has advantages such as resistivity is low, crookedness to loss when this can reduce current transport can be realized being convenient for simultaneously with the effect of other equipment connections.
As shown in fig. 3, the embodiment of the present invention further provides a current sampling system, including: a display module 900, a current sampling circuit 800 as described in any of the embodiments above. The display module 900 is configured to be electrically connected to the signal transceiver, and the display module 900 is configured to perform a display operation according to the current group; or, performing display operation according to the current group and the alarm signal.
Specifically, when the main control module determines that the current of the device to be tested is normal, the main control module outputs a current group, and the display module 900 receives the current group through the signal transceiver and performs a display operation according to a first current sampling signal and a second current sampling signal in the current group. When the main control module determines that the current of the device to be tested is abnormal, the main control module outputs a current group and an alarm signal, and the display module 900 receives the current group and the alarm signal through the signal transceiver and performs display operation according to the alarm signal and the first current sampling signal and the second current sampling signal in the current group.
It can be seen that, the contents in the foregoing current sampling circuit embodiments are all applicable to the embodiments of the present current sampling system, the functions specifically implemented by the embodiments of the present current sampling system are the same as those of the foregoing current sampling circuit embodiments, and the beneficial effects achieved by the embodiments of the present current sampling circuit are also the same as those achieved by the foregoing current sampling circuit embodiments.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. Current sampling circuit, its characterized in that is applied to the equipment that awaits measuring, current sampling circuit includes:
the conductive piece is used for being electrically connected with the equipment to be tested; the device to be tested is used for generating an initial current signal;
the first sampling module is used for being connected with the conductive piece and generating a shunt voltage signal according to the initial current signal;
the second sampling module is used for being connected with the conductive piece and generating a magnetic induction voltage signal according to the initial current signal;
the main control module is used for being electrically connected with the first sampling module and the second sampling module respectively, and the main control module is used for carrying out comparison operation according to a shunt voltage signal and a magnetic induction voltage signal to obtain a current group; or, obtaining the current group and an alarm signal; wherein the current set comprises a first current sample signal and a second current sample signal;
the isolation module is used for being electrically connected with the main control module and used for carrying out signal isolation operation on the current group or carrying out signal isolation operation on the current group and the alarm signal;
a signal transceiver for electrically connecting with the isolation module, the signal transceiver for transmitting the set of currents; or, for transmitting said set of currents and said alarm signal.
2. The current sampling circuit of claim 1, wherein the first sampling module comprises:
the two ends of the first sampling piece are respectively connected with the conductive pieces, and the first sampling piece is used for generating a shunt voltage signal according to the initial current signal;
the first operational amplifier is used for being electrically connected with the first sampling piece and the main control module respectively, and the first operational amplifier is used for carrying out signal amplification operation on the shunt voltage signal.
3. The current sampling circuit of claim 2, wherein the material of the first sample piece is a manganin alloy.
4. The current sampling circuit of claim 2, wherein the second sampling module comprises:
the second sampling piece is sleeved on the conductive piece and used for generating a magnetic induction signal according to the initial current signal, and an opening is formed in the second sampling piece;
the Hall sensor is arranged at the opening end of the second sampling piece and used for generating a magnetic induction voltage signal according to the magnetic induction signal;
and the second operational amplifier is used for being electrically connected with the Hall sensor and the main control module respectively, and is used for carrying out signal amplification operation on the magnetic induction voltage signal.
5. The current sampling circuit of claim 4, further comprising:
the power supply processing module is used for being electrically connected with an external power supply, the main control module, the isolation module, the signal transceiver, the first operational amplifier and the second operational amplifier respectively; the external power supply is used for providing power supply signals, and the power supply processing module is used for carrying out voltage adjustment processing on the power supply signals.
6. The current sampling circuit of claim 5, wherein the power supply processing module comprises:
the power supply isolator is used for being electrically connected with the external power supply, the main control module, the isolation module, the first operational amplifier and the second operational amplifier respectively, and the power supply isolator is used for generating a first power supply electronic signal according to the power supply signal; the first power supply electronic signal is used for supplying power to the main control module, the isolation module, the first operational amplifier and the second operational amplifier;
the voltage stabilizer is used for being electrically connected with the external power supply and the signal transceiver respectively, and the voltage stabilizer is used for generating a second power supply electronic signal according to the power supply signal; wherein the second supply electronic signal is used to power the signal transceiver.
7. The current sampling circuit of any one of claims 1 to 6, wherein the conductive member is a copper bar.
8. A current sampling system, comprising:
a current sampling circuit according to any one of claims 1 to 7;
the display module is electrically connected with the signal transceiver and used for performing display operation according to the current set; or, performing display operation according to the current group and the alarm signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116735929A (en) * | 2023-06-12 | 2023-09-12 | 深圳市开步电子有限公司 | Shunt, new energy automobile and energy storage equipment thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116735929A (en) * | 2023-06-12 | 2023-09-12 | 深圳市开步电子有限公司 | Shunt, new energy automobile and energy storage equipment thereof |
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