CN218974447U - Current detection device and electronic equipment - Google Patents
Current detection device and electronic equipment Download PDFInfo
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- CN218974447U CN218974447U CN202223001330.1U CN202223001330U CN218974447U CN 218974447 U CN218974447 U CN 218974447U CN 202223001330 U CN202223001330 U CN 202223001330U CN 218974447 U CN218974447 U CN 218974447U
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Abstract
The application relates to the technical field of current detection and provides a current detection device and electronic equipment, wherein the current detection device comprises a first shunt branch and a second shunt branch, the first shunt branch comprises a first resistance element and a Hall current detection device, and the first resistance element and the Hall current detection device are connected in series with a tested line; the second shunt branch comprises a second resistive element connected in parallel with the first shunt branch. According to the embodiment of the application, the current in the tested circuit is split into two paths of independent currents by the first split branch and the second split branch, the Hall detection scheme and the current detection of the current divider detection scheme are simultaneously carried out on the two paths of independent currents, and the high-integration-level and high-reliability current detection is realized on the basis of simplifying the structure of the current detection device.
Description
Technical Field
The application relates to the technical field of current detection, in particular to a current detection device and electronic equipment.
Background
In the existing current detection scheme capable of realizing the functional safety level C/D, two independent current detection modules are generally adopted for redundancy measurement: the BMS high voltage circuit measures the shunt current and the independent hall current sensor measures the current.
However, such detection schemes suffer from drawbacks such as: the occupied space is large, and spaces are reserved for the current divider and the Hall current sensor respectively; the current measurement of the current divider has poor anti-interference capability because the current divider and the acquisition circuit are not integrated together; synchronous sampling of two paths of currents cannot be realized, and verification errors are large.
Disclosure of Invention
The primary object of the embodiments of the present application is to provide a current detection device and an electronic apparatus, which can realize high integration and high reliability current detection on the basis of simplifying the structure of the current detection device.
To achieve the above object, a first aspect of an embodiment of the present application proposes a current detection device, including:
a first shunt branch;
a second shunt branch;
the first shunt branch comprises a first resistance element and a Hall current detection device, and the first resistance element and the Hall current detection device are connected in series with a tested line;
the second shunt branch includes a second resistive element in parallel with the first shunt branch.
According to some embodiments of the present utility model, there is provided a current detection apparatus, further including:
the processing module is respectively connected with the Hall current detection device and the second resistance element, and is used for respectively determining a first current value in the first shunt branch and a second current value in the second shunt branch according to a first voltage signal sampled by the Hall current detection device and a second voltage signal sampled by the second resistance element, and determining a detection current value according to the first current value and the second current value;
and determining the validity of the detected current value according to the ratio of the first current value to the second current value and the resistance ratio of the first resistance element to the second resistance element.
According to some embodiments of the present utility model, the first shunt branch further includes a first operational amplifier, and the second shunt branch further includes a second operational amplifier;
the input end of the first operational amplifier is connected with the Hall current detection device and is used for amplifying the first voltage signal and transmitting the amplified first voltage signal to the processing module through the output end;
the input end of the second operational amplifier is connected with two ends of the second resistor element and is used for amplifying the second voltage signal and transmitting the amplified second voltage signal to the processing module through the output end.
According to the current detection device provided by some embodiments of the present utility model, the processing module is a single-chip microcomputer, and the single-chip microcomputer includes a first analog-to-digital conversion module and a second analog-to-digital conversion module;
the first analog-to-digital conversion module is connected with the output end of the first operational amplifier, and the second analog-to-digital conversion module is connected with the output end of the second operational amplifier.
According to the current detection device provided by some embodiments of the present utility model, the processing module includes an analog-to-digital conversion chip and a singlechip;
the analog-to-digital conversion chip is connected with the singlechip, and the analog-to-digital conversion chip is connected with the output ends of the first operational amplifier and the second operational amplifier.
According to some embodiments of the present utility model, the second resistance element is a manganese-copper alloy welded on a copper bar.
According to some embodiments of the present utility model, there is provided a current detection apparatus, further including:
the output module is used for receiving the detection current value output by the processing module and outputting an electric signal corresponding to the detection current value.
According to some embodiments of the present utility model, the output module includes:
a CAN transceiver;
a digital isolation chip;
the CAN transceiver is connected with the processing module through the digital isolation chip and is used for converting the detection current value output by the processing module into a corresponding electric signal.
According to some embodiments of the present utility model, there is provided a current detection apparatus, further including:
and the power supply supplies power for the current detection device through the linear voltage stabilizer and the isolation power supply.
To achieve the above object, a second aspect of an embodiment of the present application proposes an electronic device, which includes the current detection apparatus according to any one of the first aspect.
The application provides a current detection device and electronic equipment, wherein the current detection device comprises a first shunt branch and a second shunt branch, the first shunt branch comprises a first resistance element and a Hall current detection device, and the first resistance element and the Hall current detection device are connected in series with a tested line; the second shunt branch comprises a second resistive element connected in parallel with the first shunt branch. According to the embodiment of the application, the current in the tested circuit is split into two paths of independent currents by the first split branch and the second split branch, the Hall detection scheme and the current detection of the current divider detection scheme are simultaneously carried out on the two paths of independent currents, and the high-integration-level and high-reliability current detection is realized on the basis of simplifying the structure of the current detection device.
Drawings
Fig. 1 is a schematic structural diagram of a current detection device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a current detecting device according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a current detecting device according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It is noted that unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.
In the existing current detection scheme capable of realizing the functional safety level C/D, two independent current detection modules are generally adopted for redundancy measurement: the BMS high voltage circuit measures the shunt current and the independent hall current sensor measures the current.
However, such detection schemes suffer from drawbacks such as: the occupied space is large, and spaces are reserved for the current divider and the Hall current sensor respectively; the current measurement of the current divider has poor anti-interference capability because the current divider and the acquisition circuit are not integrated together; synchronous sampling of two paths of currents cannot be realized, and verification errors are large.
Based on this, the embodiment of the application provides a current detection device and electronic equipment, which can realize high integration and high reliability current detection on the basis of simplifying the structure of the current detection device.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a current detection device according to an embodiment of the present application, and as shown in fig. 1, the current detection device includes:
a first shunt branch;
a second shunt branch;
the first shunt branch comprises a first resistance element R1 and a Hall current detection device H1, and the first resistance element R1 and the Hall current detection device H1 are connected in series with the tested line;
the second shunt branch comprises a second resistive element R2, the second resistive element R2 being connected in parallel with the first shunt branch.
It is understood that the first resistive element R1 may be soldered to a circuit to be tested, such as a printed circuit board (Printed Circuit Board, PCB), with the first resistive element R1 and the second resistive element R2 forming a parallel circuit.
It should be understood that, to meet the requirement of measuring a large current, the resistance of the first resistive element is much greater than that of the second resistive element, and the resistance ratio of the two resistive elements is typically 50 to 200, for example, the second resistive element with a resistance of 20 to 200 microohms is selected, and the first resistive element with a resistance of 1 to 40 milliohms may be selected.
The hall current detection device converts a current signal flowing through the first resistive element into a voltage signal by the hall principle. Specifically, the hall current-detecting device H1 may be a hall current-detecting chip, such as ACS724LLCTR chip from ALLEGRO corporation.
According to the embodiment of the application, the current in the tested circuit is split into two paths of independent currents by the first split branch and the second split branch, the Hall detection scheme and the current detection of the current divider detection scheme are simultaneously carried out on the two paths of independent currents, and the high-integration-level and high-reliability current detection function is realized on the basis of simplifying the structure of the current detection device.
In some embodiments, as shown in fig. 1, the second resistive element is a manganese copper alloy welded on a copper bar.
It is understood that a manganese-copper alloy (manganese-copper alloy having a fixed resistance) can be converted to a voltage signal using a sampled current signal.
In some embodiments, as shown in fig. 1, the current detection device further includes:
the processing module is respectively connected with the Hall current detection device and the second resistance element, and is used for respectively determining a first current value in the first shunt branch and a second current value in the second shunt branch according to a first voltage signal sampled by the Hall current detection device and a second voltage signal sampled by the second resistance element, and determining a detection current value according to the first current value and the second current value;
and determining the validity of the detected current value according to the ratio of the first current value to the second current value and the resistance ratio of the first resistance element to the second resistance element.
Specifically, the processing module determines the first current value I in the first shunt branch and the second shunt branch according to the voltage signals sampled by the Hall current detection device and the second resistance element and the resistance values of the first resistance element and the second resistance element 1 Second current value I 2 Thereby obtaining a detection current value i=i 1 +I 2 The method comprises the steps of carrying out a first treatment on the surface of the According to the first current value I 1 And a second current value I 2 Ratio I of (2) 1 ：I 2 Resistance R of first resistance element R1 1 And the resistance R of the second resistance element R2 2 Ratio r between 1 ：r 2 Determining the validity of the current value, i.e. when I 1 ：I 2 ＝r 1 ：r 2 When the detection current is valid.
In a specific embodiment, the processing module is a Single-chip microcomputer (SCM) with Analog-to-Digital Converter (ADC) modules, please refer to fig. 3, fig. 3 shows a schematic structure diagram of a current detection device provided in another embodiment of the present application, as shown in fig. 3, the Single-chip microcomputer has two independent ADC modules, namely ADC1 and ADC2, and the Single-chip microcomputer synchronously samples by controlling the ADC1 and ADC2 to convert the sampled voltage signal into a current value I 1 And I 2 。
In another embodiment, please refer to fig. 2, fig. 2 shows a schematic structural diagram of a current detection device according to another embodiment of the present application, and as shown in fig. 2, the processing module is an independent ADC chip and a single-chip microcomputer.
In some embodiments, the first shunt branch further comprises a first operational amplifier, and the second shunt branch further comprises a second operational amplifier;
the input end of the first operational amplifier is connected with the Hall current detection device and is used for amplifying the first voltage signal and transmitting the amplified first voltage signal to the processing module through the output end;
the input end of the second operational amplifier is connected with two ends of the second resistor element and is used for amplifying the second voltage signal and transmitting the amplified second voltage signal to the processing module through the output end.
As shown in fig. 1, two input terminals of the second operational amplifier OA2 are connected to two ends of the second resistive element R2, and one input terminal of the first operational amplifier OA1 is connected to the hall current detection device H1, and the other input terminal is grounded.
The first voltage signal and the second voltage signal are amplified through the first operational amplifier and the second operational amplifier, and the amplified first voltage signal and second voltage signal are respectively transmitted to the processing module.
In some embodiments, the processing module is a single-chip microcomputer, and the single-chip microcomputer includes a first analog-to-digital conversion module and a second analog-to-digital conversion module;
the first analog-to-digital conversion module is connected with the output end of the first operational amplifier, and the second analog-to-digital conversion module is connected with the output end of the second operational amplifier.
As shown in fig. 3, the single-chip microcomputer includes a first analog-to-digital conversion module ADC1 and a second analog-to-digital conversion module ADC2, where the first analog-to-digital conversion module ADC1 is connected to an output end of the first operational amplifier OA1, and the second analog-to-digital conversion module ADC2 is connected to an output end of the second operational amplifier OA 2.
In some embodiments, the processing module includes an analog-to-digital conversion chip and a single chip microcomputer;
the analog-to-digital conversion chip is connected with the singlechip, and the analog-to-digital conversion chip is connected with the output ends of the first operational amplifier and the second operational amplifier.
As shown in fig. 2, the processing module includes an analog-to-digital conversion chip, i.e., an ADC chip, which is connected to the output terminals of the first operational amplifier OA1 and the second operational amplifier OA 2.
In some embodiments, the current detection apparatus further comprises:
the output module is used for receiving the detection current value output by the processing module and outputting an electric signal corresponding to the detection current value.
Illustratively, as shown in FIG. 1, the output module is coupled to the processing module for receiving an output of the processing module and converting the output to a corresponding electrical signal.
In some embodiments, the output module comprises:
a CAN transceiver;
a digital isolation chip;
the CAN transceiver is connected with the processing module through the digital isolation chip and is used for converting the detection current value output by the processing module into a corresponding electric signal.
As shown in fig. 3, the digital isolation chip and the CAN transceiver are connected with a single chip in sequence, and the single chip performs digital isolation on the detected current value through the digital isolation chip and then outputs the detected current value through the CAN transceiver.
In some embodiments, the current detection apparatus further comprises:
and the power supply supplies power for the current detection device through the linear voltage stabilizer and the isolation power supply.
It will be appreciated that, as shown in fig. 3, the current detection device further includes an isolation power supply and a linear regulator LDO, a power supply (not shown), and the current detection device is powered by the linear regulator and the isolation power supply, such as a first operational amplifier, a second operational amplifier, a single chip microcomputer, a digital isolation chip and a CAN transceiver.
The current detection device provided by the application is described below through a specific embodiment, as shown in fig. 3, the device is used for detecting a circuit on a PCB, and the device comprises a copper bar, a manganese-copper alloy R2 welded on the copper bar, a hall current detection chip H1, a resistor R1, an operational amplifier OA2, a singlechip, a digital isolation chip, a CAN transceiver, a linear voltage regulator LDO isolation power supply and a power supply.
The resistor R2 is welded on the PCB, the PCB is welded on copper bars at two sides of the manganese-copper alloy R2, the resistance value of the resistor R1 is larger than that of the manganese-copper alloy R2, the copper bars, the manganese-copper alloy R2 and the resistor R1 form a current loop, the manganese-copper alloy R2 and the resistor R1 form a parallel circuit, the current loop is shunted through the manganese-copper alloy R2 and the resistor R1, and currents on the loops of the manganese-copper alloy R2 and the resistor R1 are measured respectively and added.
Measurement of loop current on manganese copper alloy R2: the manganese-copper alloy (the manganese-copper alloy has a fixed resistance value) is responsible for converting a sampling current signal into a voltage signal, and the operational amplifier OA2 amplifies the voltage signal and sends the voltage signal to an ADC module of the singlechip.
Measurement of loop current across resistor R1: the resistor R1 loop is connected in series with the Hall current detection chip H1, the Hall current detection chip converts a current signal flowing through the resistor R1 into a voltage signal through a Hall principle, and the voltage signal is amplified through the operational amplifier OA1 and then is sent to the ADC module of the singlechip.
The singlechip controls the two ADC modules to synchronously sample and converts the voltage value into a current value I 1 And I 2 Calculate the total current value i=i 1 +I 2 The singlechip carries out digital isolation on the current value I through a digital isolation chip and then outputs the current value I through the CAN transceiver.
In addition, the power supply supplies power to the current detection device through the LDO isolation power supply of the linear voltage regulator.
In order to ensure the accuracy and reliability of current detection, the singlechip performs current detection according to the following strategies:
step 1: the singlechip performs power diagnosis and self-checking, and continues to execute if no error occurs, and if no error occurs, the singlechip outputs current 0 and gives out a fault alarm:
step 2: the singlechip controls the two ADC modules to synchronously sample to obtain a current value I 1 And I 2 And filtering;
step 3: calculating the detected current value i=i 1 +I 2 ；
Step 4: judging the validity of the detected current value, if I 1 ：I 2 ＝r 1 ：r 2 The current is effective, where r 1 And r 2 The resistance values of the resistor R1 and the manganese copper alloy R2 are obtained.
The current detection device can integrate two current measurement methods of Hall effect conversion and manganese-copper alloy sampling conversion on the same circuit, does not need to use complex structural members such as a magnetic ring, a ferromagnetic shielding cover and the like, and can realize high-integration-level and high-reliability current detection under the condition of simplifying the structure of the current detection device.
The embodiment of the application also provides electronic equipment, which comprises the current detection device described in any embodiment.
It should be noted that, for each description of the specific structure and effects of the current detection device of the electronic device provided in the embodiment of the present application, please refer to the above embodiment to provide a description of the current detection device, which is not repeated here.
It should be appreciated that in the description of the embodiments of the present application, if any, the descriptions of "first," "second," etc. are used for the purpose of distinguishing between technical features only, and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated. "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may communicate with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application.
Claims (10)
1. A current detection device, characterized in that the current detection device comprises:
a first shunt branch;
a second shunt branch;
the first shunt branch comprises a first resistance element and a Hall current detection device, and the first resistance element and the Hall current detection device are connected in series with a tested line;
the second shunt branch includes a second resistive element in parallel with the first shunt branch.
2. The current detection device according to claim 1, characterized in that the current detection device further comprises:
the processing module is respectively connected with the Hall current detection device and the second resistance element, and is used for respectively determining a first current value in the first shunt branch and a second current value in the second shunt branch according to a first voltage signal sampled by the Hall current detection device and a second voltage signal sampled by the second resistance element, and determining a detection current value according to the first current value and the second current value;
and determining the validity of the detected current value according to the ratio of the first current value to the second current value and the resistance ratio of the first resistance element to the second resistance element.
3. The current detection device of claim 2, wherein the first shunt branch further comprises a first operational amplifier, and the second shunt branch further comprises a second operational amplifier;
the input end of the first operational amplifier is connected with the Hall current detection device and is used for amplifying the first voltage signal and transmitting the amplified first voltage signal to the processing module through the output end;
the input end of the second operational amplifier is connected with two ends of the second resistor element and is used for amplifying the second voltage signal and transmitting the amplified second voltage signal to the processing module through the output end.
4. The current detection device according to claim 3, wherein the processing module is a single-chip microcomputer, and the single-chip microcomputer comprises a first analog-to-digital conversion module and a second analog-to-digital conversion module;
the first analog-to-digital conversion module is connected with the output end of the first operational amplifier, and the second analog-to-digital conversion module is connected with the output end of the second operational amplifier.
5. The current detection device according to claim 3, wherein the processing module comprises an analog-to-digital conversion chip and a single chip microcomputer;
the analog-to-digital conversion chip is connected with the singlechip, and the analog-to-digital conversion chip is connected with the output ends of the first operational amplifier and the second operational amplifier.
6. The current detection device according to claim 1, wherein the second resistance element is a manganese-copper alloy welded on a copper bar.
7. The current detection device according to claim 2, characterized in that the current detection device further comprises:
the output module is used for receiving the detection current value output by the processing module and outputting an electric signal corresponding to the detection current value.
8. The current detection apparatus according to claim 7, wherein the output module includes:
a CAN transceiver;
a digital isolation chip;
the CAN transceiver is connected with the processing module through the digital isolation chip and is used for converting the detection current value output by the processing module into a corresponding electric signal.
9. The current detection device according to claim 1, characterized in that the current detection device further comprises:
and the power supply supplies power for the current detection device through the linear voltage stabilizer and the isolation power supply.
10. An electronic device, characterized in that the electronic device comprises the current detection apparatus according to any one of claims 1 to 9.
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| CN202223001330.1U CN218974447U (en) | 2022-11-09 | 2022-11-09 | Current detection device and electronic equipment |
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518000 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
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