CN212568912U - Current detection device and vehicle - Google Patents
Current detection device and vehicle Download PDFInfo
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- CN212568912U CN212568912U CN202021666834.3U CN202021666834U CN212568912U CN 212568912 U CN212568912 U CN 212568912U CN 202021666834 U CN202021666834 U CN 202021666834U CN 212568912 U CN212568912 U CN 212568912U
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Abstract
The application provides a current detection device and a vehicle, and the current detection device comprises a Hall sensor, a microprocessor and a power supply unit. The Hall sensor is positioned in a magnetic field region generated by the current of the structure to be detected, and is not electrically connected with the structure to be detected; the microprocessor is electrically connected with the Hall sensor and used for judging whether the current of the structure to be detected is greater than an overcurrent protection threshold value or not according to the output of the Hall sensor and sending an alarm signal under the condition that the current is greater than the overcurrent protection threshold value; and the power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and is used for supplying power to the Hall sensor and the microprocessor. Through this current detection device, realized the function of the electric current of non-contact detection low voltage distribution box to current detection device is small, and the installation is convenient, and the power of consumption is extremely low, and can satisfy the measurement of the heavy current more than 100A.
Description
Technical Field
The application relates to the field of electricity, in particular to a current detection device and a vehicle.
Background
The low-voltage distribution box is an important component of a new energy automobile, is used for distributing electric energy for low-voltage electric parts of the whole automobile, needs to detect the magnitude of a current value of the low-voltage distribution box for ensuring the safety and reliability of power distribution, is beneficial to timely protection, and can measure the magnitude of the current value by using a current transformer, an intervention type Hall sensor, a resistor and the like.
In the case of measuring current by adopting a current transformer, the current transformer needs to be installed by threading, has larger volume and is inconvenient to produce; in the case of measuring current by using the intrusive hall sensor, the intrusive hall sensor needs to be connected in series with a circuit to measure the current, so that the reliability is affected, and the 100A-level large current cannot be measured; a series resistance can be used to measure the current indirectly, but this results in greater power consumption, affecting circuit reliability.
The above information disclosed in this background section is only for enhancement of understanding of the background of the technology described herein and, therefore, certain information may be included in the background that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
The main aim at of this application provides a current detection device and vehicle to solve prior art and be difficult to adopt the small-size and need not to concatenate the detection device of circuit and detect the problem of the electric current of low voltage distribution box.
In order to achieve the above object, according to one aspect of the present application, there is provided a current detection device including a hall sensor, a microprocessor, and a power supply unit. The Hall sensor is positioned in a magnetic field region generated by the current passing through the structure to be detected, and is not electrically connected with the structure to be detected; the microprocessor is electrically connected with the Hall sensor and used for judging whether the current of the structure to be detected is greater than an overcurrent protection threshold value or not according to the output of the Hall sensor and sending an alarm signal under the condition that the current is greater than the overcurrent protection threshold value; and the power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and is used for supplying power to the Hall sensor and the microprocessor.
Further, the hall sensor is located in a central region of the magnetic field region, and the central region includes a center of the magnetic field region and has an area equal to an area occupied by the hall sensor.
Further, the projection of the center of the hall sensor in the magnetic field area coincides with the center of the magnetic field area.
Furthermore, the current detection device further comprises a filtering unit, one end of the filtering unit is connected to a predetermined branch, the predetermined branch is used for electrically connecting the output end of the hall sensor and the input end of the microprocessor, and the other end of the filtering unit is grounded.
Further, the filtering unit includes at least one capacitor.
Further, the microprocessor comprises an analog-to-digital conversion port, and the output end of the Hall sensor is electrically connected with the analog-to-digital conversion port.
Further, the power supply unit comprises a power supply battery and a DC-DC converter, one end of the DC-DC converter is electrically connected with the power supply battery, and the other end of the DC-DC converter is electrically connected with the Hall sensor and the microprocessor respectively.
Furthermore, the current detection device further comprises a CAN transceiver electrically connected with the output end of the microprocessor, and used for receiving the judgment result of the microprocessor and the current information of the structure to be detected and sending the information to other equipment.
According to another aspect of the present application, there is provided a vehicle including a low voltage distribution box and a current detection device for detecting a current of the low voltage distribution box, the current detection device being any one of the current detection devices described above.
Further, the vehicle still includes vehicle control unit and whole car instrument, current detection device includes the CAN transceiver, the CAN transceiver with current detection device's microprocessor's output electricity is connected, is used for receiving microprocessor's judgement result and the current information of structure that awaits measuring, and send to vehicle control unit or whole car instrument.
According to the technical scheme, the Hall sensor converts a magnetic field intensity signal into a voltage signal to be output by utilizing the Hall effect, the microprocessor receives the voltage signal, converts the voltage signal into a corresponding current value, compares the current value with an overcurrent protection threshold value of a structure to be detected and judges, and sends an alarm signal when the current value is greater than the overcurrent protection threshold value. The power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and supplies power to the Hall sensor and the microprocessor. The current detection device detects the low-voltage distribution box, the detection device is not required to be connected into a distribution circuit of the low-voltage distribution box, the normal work of the distribution circuit is not influenced, and the non-contact detection of the current of the low-voltage distribution box can be realized. Moreover, the current detection device is small in size, does not need to be installed through threads, is convenient to install, consumes extremely low power and can meet the requirement of measuring large current of more than 100A.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a schematic diagram of a current detection device according to an embodiment of the present application.
Wherein the figures include the following reference numerals:
10. a Hall sensor; 20. a microprocessor; 30. a power supply unit; 40. a filtering unit; 50. a CAN transceiver; 32. a DC-DC converter.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, in the prior art, a current detection device of a low-voltage distribution box has a large volume and needs to be connected in series with a circuit for detection.
In an exemplary embodiment of the present application, a current sensing device is provided. Fig. 1 shows a schematic diagram of a current detection device of an embodiment of the present application. The current detection device includes a hall sensor 10, a microprocessor 20, and a power supply unit 30. The hall sensor 10 is located inside a magnetic field region generated by the structure to be measured when current flows through the structure, and the hall sensor is not electrically connected with the structure to be measured. The microprocessor 20 is electrically connected to the hall sensor, and is configured to determine whether the current of the structure to be tested is greater than an overcurrent protection threshold according to the output of the hall sensor, and send an alarm signal if the current of the structure to be tested is greater than the overcurrent protection threshold. The power supply unit 30 is electrically connected to the hall sensor and the microprocessor, respectively, and supplies power to the hall sensor and the microprocessor.
In the above embodiments, the specific implementation manner is: according to ampere's law, when a current flows through a conductor, a magnetic field is formed around the conductor, the magnitude of the magnetic field is proportional to the current of the conductor and inversely proportional to the distance, and the magnetic field intensity formula is as follows:
H＝I/2πr
where H is the magnetic field strength, r is the distance from the current carrying conductor, and I is the value of the current flowing.
According to the above formula, the structure to be tested is installed at one side of the above current detection device of the present application, the structure to be tested is electrified, the current flows through the structure to be tested to generate a magnetic field, and by utilizing the hall effect, i.e. when a current is passed through the conductor perpendicular to the external magnetic field, a potential difference will occur between the two end faces of the conductor perpendicular to the magnetic field and the direction of the current, the Hall sensor can convert the magnetic field intensity signal into a voltage signal to be output, the voltage signal is sent to the microprocessor, the voltage signal corresponds to a specific magnetic field intensity, the magnetic field intensity corresponds to a specific current value, different current values are introduced into the structure to be measured, the voltage signal generated by the Hall sensor is recorded, the corresponding proportion relation between the current value and the voltage signal is found out, when any current value flows, the output voltage of the Hall sensor is measured, and the magnitude of the current value can be known. And the microprocessor judges whether the current value corresponding to the voltage signal is greater than the overcurrent protection threshold value of the structure to be tested according to the output voltage signal of the Hall sensor, and sends an alarm signal under the condition that the current value is greater than the overcurrent protection threshold value. The power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and used for supplying power to the Hall sensor and the microprocessor so as to ensure that the Hall sensor and the microprocessor work normally. Moreover, the Hall sensor has the advantages of firm structure, small volume, light weight, low power consumption, convenient installation and high precision; the microprocessor is small in size and light in weight, so that the current detection device consisting of the Hall sensor and the microprocessor also has the advantages of small size, convenience in installation and low power consumption.
In the current detection device, the Hall sensor converts a magnetic field intensity signal into a voltage signal by utilizing a Hall effect and outputs the voltage signal, the microprocessor receives the voltage signal, converts the voltage signal into a corresponding current value, compares the current value with an overcurrent protection threshold value of a structure to be detected and judges, and sends out an alarm signal under the condition that the current value is greater than the overcurrent protection threshold value. The power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and supplies power to the Hall sensor and the microprocessor. The current detection device detects the low-voltage distribution box, the detection device is not required to be connected into a distribution circuit of the low-voltage distribution box, normal work of the distribution circuit is not influenced, and non-contact detection of the current of the low-voltage distribution box can be achieved. Moreover, the current detection device is small in size, convenient to install, extremely low in consumed power and capable of meeting the requirement of measuring large current of more than 100A, and does not need to be installed through threading.
In an embodiment of the application, the structure to be tested is tightly attached to the current detection device, so that the test result of the current detection device is more accurate.
In another embodiment of the present application, the hall sensor is a chip of model MLX91206, and the microprocessor is PIC18F25K 80. The hall sensor of the present application is not limited to the above chip, nor is the microprocessor limited to the above PIC18F25K80, both of which may be other possible devices or chips.
In an embodiment of the present invention, the hall sensor is located in a central region of the magnetic field region, and the central region includes a center of the magnetic field region and has an area equal to an area occupied by the hall sensor. According to the operating principle of the hall sensor, namely the hall effect, when a current passes through a conductor perpendicular to an external magnetic field, carriers are deflected, and an additional electric field is generated in a direction perpendicular to the current and the magnetic field, so that a potential difference is generated at two ends of the conductor. The Hall sensor is positioned in the central area of the magnetic field area, so that the accuracy of testing the current value of the structure to be tested is ensured.
In another embodiment of the present application, a projection of the center of the hall sensor in the magnetic field area coincides with the center of the magnetic field area. Therefore, the accuracy of testing the current value of the structure to be tested is further ensured.
In another embodiment of the present application, the current detecting apparatus further includes a filter unit 40, as shown in fig. 1, one end of the filter unit 40 is connected to a predetermined branch, the predetermined branch is used to electrically connect the output terminal of the hall sensor and the input terminal of the microprocessor, and the other end of the filter unit 40 is grounded. The filter unit is connected with the output end of the Hall sensor and the input end of the microprocessor through two ends of a preset branch respectively, the Hall sensor converts a magnetic field intensity signal into a voltage signal by utilizing a Hall effect and outputs the voltage signal, the voltage signal is filtered by the filter unit and then output to the microprocessor, and the filter unit effectively filters a frequency point with a specific frequency in the voltage signal or frequencies except the frequency point to obtain a signal with the specific frequency or eliminate the signal with the specific frequency. The filtering unit effectively eliminates the distortion of the voltage signal caused by the environment and the interference in the processes of generation, transmission and conversion.
The filtering unit in the above application may be one of a low-pass filtering unit, a high-pass filtering unit, a band-stop filtering unit or a band-pass filtering unit, may also be one of a mechanical filtering unit or a circuit filtering unit, and may also be one of an analog filtering unit or a digital filtering unit, and a specific voltage signal may be effectively screened out by the filtering unit, and distortion caused by the environment and interference in the generation, transmission and conversion processes of the voltage signal is effectively filtered.
In order to effectively eliminate the noise carried by the voltage signal due to the environment and the interference in the generation, transmission and conversion processes and ensure that the structure of the detection device is simpler, in a further embodiment of the present application, the filtering unit comprises at least one capacitor. The voltage signal output by the hall sensor is filtered by the capacitor of the filter unit and then is output to the microprocessor. Of course, the filtering unit does not necessarily include a capacitor, and may include one of an inductor and a resistor, and the filtering unit also does not necessarily include one capacitor, and may further include a plurality of capacitors, inductors, and resistors, or a combination of several capacitors, inductors, and resistors. In a specific embodiment, the filter unit includes a filter capacitor.
In a specific embodiment of the present application, the microprocessor includes an analog-to-digital conversion port, and the output end of the hall sensor is electrically connected to the analog-to-digital conversion port. And the microprocessor converts the voltage signal output by the Hall sensor into a digital quantity through the double-digital analog-to-digital conversion port for storage, compares the digital quantity with the over-current protection threshold value of the structure to be detected, and sends an alarm signal under the condition that the digital quantity is greater than the over-current protection threshold value. The analog-to-digital conversion port converts an analog voltage signal with continuous time and amplitude into a digital current value signal with discrete time and amplitude, so that the microprocessor can conveniently judge and compare the signals and output a detection result.
In another specific embodiment of the present application, the power supply unit includes a power supply battery and a DC-DC converter 32, as shown in fig. 1, the power supply battery is not shown in fig. 1, and only positive and negative interfaces of the power supply battery are shown. The power supply battery supplies power to the current detection device, and one end of the DC-DC converter 32 is electrically connected to the power supply battery, and the other end is electrically connected to the hall sensor and the microprocessor, respectively. The two ends of the DC-DC converter are respectively connected with the power supply battery, the Hall sensor and the microprocessor to provide working power supply for the Hall sensor and the microprocessor. The DC-DC converter can convert different input voltages into voltages usable by the Hall sensor and the microprocessor, and further ensures the convenience of the current detection device.
In a specific embodiment of the present application, the current detection apparatus further includes a CAN transceiver 50, as shown in fig. 1. The CAN transceiver is electrically connected with the output end of the microprocessor, is used for receiving the judgment result of the microprocessor and the current information of the structure to be tested, and sends the judgment result and the current information to other equipment. The CAN transceiver receives and converts the current information of the microprocessor and the judged fault information into electric signals, and then transmits the converted electric signals to other equipment to display the detection result of the current detection device. The detection result of the current detection device CAN be displayed on the other equipment through the receiving, the conversion and the signal transmission of the CAN transceiver, so that a detection person CAN directly see the current state of the structure to be detected through the other equipment, and the CAN transceiver is very visual and convenient.
In one embodiment, the CAN transceiver is a chip ATA 6564. Of course, the CAN transceiver described above in the present application is not limited to the CAN transceiver described above, and may be other possible CAN transceivers.
The CAN transceiver sends the judgment result and the current information to other equipment, which CAN comprise one or more of a controller, a display and an instrument panel, and the current state information of the structure to be tested is visually displayed through the other equipment, so that a tester CAN conveniently know the test result.
In yet another specific embodiment of the present application, there is provided a vehicle including a low-voltage distribution box and a current detection device for detecting a current of the low-voltage distribution box, the current detection device being any one of the current detection devices described above.
The vehicle comprises the current detection device, the low-voltage distribution box is detected through the current detection device, the detection device is not required to be connected into a distribution circuit of the low-voltage distribution box, normal work of the distribution circuit is not influenced, non-contact detection of current of the low-voltage distribution box can be achieved, and when the detected current is large, an alarm can be given out, and safe running of the vehicle is guaranteed. Moreover, the current detection device is small in size, the vehicle is guaranteed to be small in size, the detection device does not need to be installed through threads, installation is convenient, consumed power is extremely low, meanwhile, measurement of large current of more than 100A can be met, and safety of the vehicle is further guaranteed.
In another embodiment of the present application, the vehicle further includes a vehicle controller and a vehicle instrument, the current detection device includes a CAN transceiver, and the CAN transceiver is electrically connected to an output end of a microprocessor of the current detection device, and is configured to receive a determination result of the microprocessor and current information of the structure to be detected, and send the determination result to the vehicle controller or the vehicle instrument. The detection result of the current of the low-voltage distribution box can be visually seen by a detector on the vehicle controller or the vehicle instrument of the vehicle, so that the detection result of the low-voltage distribution box can be conveniently confirmed and processed by the detector.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) in the current detection device, the Hall sensor converts a magnetic field intensity signal into a voltage signal by utilizing a Hall effect and outputs the voltage signal, the microprocessor receives the voltage signal, converts the voltage signal into a corresponding current value, compares the current value with an overcurrent protection threshold value of a structure to be detected and judges, and sends out an alarm signal under the condition that the current value is greater than the overcurrent protection threshold value. The power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and supplies power to the Hall sensor and the microprocessor. The current detection device detects the low-voltage distribution box, the detection device is not required to be connected into a distribution circuit of the low-voltage distribution box, normal work of the distribution circuit is not influenced, and non-contact detection of the current of the low-voltage distribution box can be achieved. Moreover, the current detection device is small in size, convenient to install, extremely low in consumed power and capable of meeting the requirement of measuring large current of more than 100A, and does not need to be installed through threading.
2) The vehicle comprises the low-voltage distribution box and the current detection device, the low-voltage distribution box is detected through the current detection device, the detection device is not required to be connected into a distribution circuit of the low-voltage distribution box, normal work of the distribution circuit is not affected, non-contact detection of current of the low-voltage distribution box can be achieved, and when the current is detected to be large, an alarm can be sent out, and safe running of the vehicle is guaranteed. Moreover, the current detection device is small in size, the vehicle is guaranteed to be small in size, the detection device does not need to be installed through threads, installation is convenient, consumed power is extremely low, meanwhile, measurement of large current of more than 100A can be met, and safety of the vehicle is further guaranteed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A current detecting device, comprising:
the Hall sensor is positioned in a magnetic field region generated by the current passing through the structure to be detected, and is not electrically connected with the structure to be detected;
the microprocessor is electrically connected with the Hall sensor and used for judging whether the current of the structure to be detected is greater than an overcurrent protection threshold value or not according to the output of the Hall sensor and sending an alarm signal under the condition that the current is greater than the overcurrent protection threshold value;
and the power supply unit is electrically connected with the Hall sensor and the microprocessor respectively and is used for supplying power to the Hall sensor and the microprocessor.
2. The current detecting device according to claim 1, wherein the hall sensor is located in a central region of the magnetic field region, the central region being a region including a center of the magnetic field region and having an area equal to an area occupied by the hall sensor.
3. The current sensing device of claim 1, wherein a projection of a center of the hall sensor onto a magnetic field area coincides with the center of the magnetic field area.
4. The current detection device according to claim 1, further comprising:
and one end of the filtering unit is connected to a predetermined branch circuit, the predetermined branch circuit is used for electrically connecting the output end of the Hall sensor and the input end of the microprocessor, and the other end of the filtering unit is grounded.
5. The current sensing device of claim 4, wherein the filtering unit comprises at least one capacitor.
6. The current sensing device of claim 1, wherein the microprocessor includes an analog-to-digital conversion port, and wherein the output of the hall sensor is electrically connected to the analog-to-digital conversion port.
7. The current detection device according to any one of claims 1 to 6, wherein the power supply unit includes:
a power supply battery;
and one end of the DC-DC converter is electrically connected with the power supply battery, and the other end of the DC-DC converter is electrically connected with the Hall sensor and the microprocessor respectively.
8. The current detection device according to any one of claims 1 to 6, characterized by further comprising:
and the CAN transceiver is electrically connected with the output end of the microprocessor, is used for receiving the judgment result of the microprocessor and the current information of the structure to be detected, and sends the judgment result and the current information to other equipment.
9. A vehicle comprising a low-voltage distribution box and a current detection device for detecting a current of the low-voltage distribution box, characterized in that the current detection device is a current detection device according to any one of claims 1 to 8.
10. The vehicle of claim 9, further comprising a vehicle controller and a vehicle instrument, wherein the current detection device comprises a CAN transceiver electrically connected to an output of a microprocessor of the current detection device, and configured to receive a determination result of the microprocessor and the current information of the structure to be detected and send the determination result to the vehicle controller or the vehicle instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021666834.3U CN212568912U (en) | 2020-08-11 | 2020-08-11 | Current detection device and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021666834.3U CN212568912U (en) | 2020-08-11 | 2020-08-11 | Current detection device and vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN212568912U true CN212568912U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021666834.3U Active CN212568912U (en) | 2020-08-11 | 2020-08-11 | Current detection device and vehicle |
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| CN (1) | CN212568912U (en) |
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- 2020-08-11 CN CN202021666834.3U patent/CN212568912U/en active Active
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