Current detector, motor control system and vehicle

Abstract

The utility model is suitable for the technical field of detection, and provides a current detector, a motor control system and a vehicle. The current detector comprises a circuit board, N sampling resistors and 2N connecting pieces, two connecting ends of each sampling resistor are respectively connected with one connecting piece, and a plurality of connecting points on the circuit board are respectively and correspondingly connected with two connecting ends of all the sampling resistors. The circuit board is used for outputting a detection signal according to a voltage signal between the sampling resistor and the two connecting ends, and N is an integer greater than or equal to 1. The current detector provided by the embodiment of the utility model is composed of the circuit board, the sampling resistor and the connecting piece, and the circuit board, the sampling resistor and the connecting piece can realize the light and thin design more easily, so that the flat design of the whole current detector is facilitated, the overall thickness of the current detector is reduced, the miniaturization design of the current detector is realized, and the cost is reduced. And the installation flexibility of the current detector is improved.

Description

Technical Field

[0001] The present application belongs to the field of detection technology, and in particular relates to a current detector, a motor control system and a vehicle. Background Art

[0002] Some devices need to detect their current working current when they are working, so as to control the devices according to the current working current. At present, Hall sensors and magnetic rings are usually used for current detection, but the combination of Hall sensors and magnetic rings has the disadvantage of being large in size, which limits their installation. Utility Model Content

[0003] The embodiments of the present application provide a current detector, a motor control system and a vehicle, which can solve the problem that the existing current detection devices are large in size and affect installation.

[0004] In a first aspect, an embodiment of the present application provides a current detector, comprising a circuit board, N sampling resistors and 2N connectors, wherein the two connection ends of each sampling resistor are respectively connected to one of the connectors, and the multiple connection points on the circuit board are respectively connected to the connection ends of all the sampling resistors. The circuit board is used to output a detection signal according to a voltage signal between the two connection ends of the sampling resistor, and N is an integer greater than or equal to 1.

[0005] In a possible implementation manner of the first aspect, the connecting member includes a metal sheet, and the two connecting ends of the sampling resistor are respectively connected to one of the metal sheets.

[0006] In a possible implementation manner of the first aspect, a thickness of the sampling resistor is the same as a thickness of the metal sheet, a cross-section of a connection end of the sampling resistor is the same as a cross-section of a first end of the metal sheet, and the first end of the metal sheet is connected to one connection end of the sampling resistor.

[0007] In a possible implementation manner of the first aspect, the sampling resistor includes a resistor body, two connection ends of the resistor body are respectively provided with a pin, and the connection points on the circuit board are respectively connected to the pins on the two connection ends of the resistor body.

[0008] In a possible implementation manner of the first aspect, the current detector further includes an insulating sleeve, which is sleeved on pins of the sampling resistor and is located between the resistor body and the circuit board.

[0009] In a possible implementation manner of the first aspect, each of the connecting members is provided with a through hole.

[0010] In a possible implementation manner of the first aspect, a resistance of the sampling resistor is 0.01 milliohms to 0.1 milliohms.

[0011] In a possible implementation manner of the first aspect, the current detector further includes a connector, on which a plurality of electrical connectors are disposed, and the plurality of electrical connectors on the connector are respectively connected to the plurality of wiring terminals on the circuit board.

[0012] In a second aspect, an embodiment of the present application provides a motor control system, comprising the current detector described in any one of the first aspects.

[0013] In a third aspect, an embodiment of the present application provides a vehicle, comprising the motor control system described in the second aspect.

[0014] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0015] An embodiment of the present application provides a current detector, including a circuit board, N sampling resistors and 2N connectors, wherein the two connection ends of each sampling resistor are respectively connected to a connector, and multiple connection points on the circuit board are respectively connected to the two connection ends of all the sampling resistors. The circuit board is used to output a detection signal according to a voltage signal between the two connection ends of the sampling resistor, and N is an integer greater than or equal to 1.

[0016] When using a current detector, connect the current detector in series in the circuit to be detected, that is, connect the connector connected to one connection end of the sampling resistor to the electrical device, and connect the connector connected to the other connection end of the sampling resistor to the power supply device. The current output by the power supply device is transmitted to the electrical device through the connector and the sampling resistor to supply power to the electrical device. When the current passes through the sampling resistor, a voltage signal is generated between the two connection ends of the sampling resistor. The circuit board will collect the voltage signal between the two connection ends of all sampling resistors, and output a detection signal based on the voltage signal between the two connection ends of the sampling resistor. The detection signal can represent the working current of the electrical device, thereby completing the detection of the working current of the electrical device.

[0017] When using a combination of a Hall sensor and a magnetic ring for current detection, the magnetic ring needs to be sleeved on the line to be detected, so the volume of the magnetic ring is large, resulting in limited installation. The current detector provided in the embodiment of the present application is composed of a circuit board, a sampling resistor and a connector. The circuit board, the sampling resistor and the connector can more easily achieve a lightweight design, thereby contributing to the flat design of the entire current detector, reducing the overall thickness of the current detector, realizing the miniaturization design of the current detector, and improving the flexibility of the installation of the current detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 is a structural schematic diagram of a current detector provided in an embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of a current detector provided in another embodiment of the present application.

[0021] In the figure: 100, circuit board; 200, sampling resistor; 300, connecting piece; 301, through hole; 400, connector. DETAILED DESCRIPTION

[0022] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0023] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0025] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0026] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] Some devices need to detect their current working current when they are working, so as to control the device according to the current working current. For example, when the drive motor of a new energy electric vehicle is working, it is necessary to detect the working current (three-phase AC current) of the drive motor. The controller of the drive motor implements torque closed-loop control according to the three-phase AC current, thereby improving the efficiency of the drive motor and reducing the loss of the drive motor. However, Hall sensors and magnetic rings are usually used for current detection at present. When performing current detection, the magnetic ring needs to be sleeved on the line to be detected. If the wire diameter of the line to be detected is large, in order to ensure that the magnetic ring can be sleeved on the line to be detected, the cross-section of the through hole on the magnetic ring needs to be larger than the wire diameter of the line to be detected, resulting in a larger volume of the magnetic ring, which ultimately leads to the disadvantage of a large volume in the combination of the Hall sensor and the magnetic ring, resulting in installation restrictions.

[0029] Based on the above problems, the present application provides a current detector. Figure 1 As shown, the current detector includes a circuit board 100, N sampling resistors 200 and 2N connectors 300, the two connection ends of each sampling resistor 200 are respectively connected to a connector 300, and multiple connection points on the circuit board 100 are respectively connected to the connection ends of all the sampling resistors 200. The circuit board 100 is used to output a detection signal according to a voltage signal between the two connection ends of the sampling resistor 200, and N is an integer greater than or equal to 1.

[0030] Specifically, the two connection ends on the sampling resistor 200 are two opposite end surfaces on the sampling resistor 200, and the two connection ends on the sampling resistor 200 are respectively connected to a connector 300. When using a current detector, the current detector is connected in series in the circuit to be detected, that is, the connector 300 connected to one connection end of the sampling resistor 200 is connected to the electrical device, and the connector 300 connected to the other connection end of the sampling resistor 200 is connected to the power supply device. The current output by the power supply device is transmitted to the electrical device through the connector 300 and the sampling resistor 200 to supply power to the electrical device. The two connection ends on all sampling resistors 200 are also respectively connected to a plurality of connection points on the circuit board 100. When the current passes through the sampling resistor 200, a voltage signal will be generated between the two connection ends of the sampling resistor 200. The circuit board 100 will collect the voltage signal between the two connection ends of all sampling resistors 200, and process the voltage signal between the two connection ends of the sampling resistor 200 to output a detection signal, which can represent the working current of the electrical device, thereby completing the detection of the working current of the electrical device.

[0031] The current detector provided in the embodiment of the present application is composed of a circuit board 100, a sampling resistor 200 and a connector 300. The circuit board 100, the sampling resistor 200 and the connector 300 can more easily realize a light and thin design, thereby contributing to the flat design of the entire current detector, reducing the overall thickness of the current detector, realizing the miniaturization design of the current detector, and improving the flexibility of the installation of the current detector. At the same time, compared with the traditional current sensor, the current detector provided in the embodiment of the present application uses fewer devices, has a simple structure, and has the characteristics of low cost, thereby reducing the production cost of the product.

[0032] When N is equal to 1, the current detector includes a circuit board 100, a sampling resistor 200 and two connectors 300, and the two connecting ends of the sampling resistor 200 are respectively connected to a connector 300. At this time, the current detector can detect the current of a power line of the electrical device.

[0033] When N is equal to 2, the current detector includes a circuit board 100, two sampling resistors 200 and four connectors 300, and the two connection ends of each sampling resistor 200 are respectively connected to a connector 300. At this time, the current detector can simultaneously detect the current of the two power lines of the electrical equipment.

[0034] When N is equal to 3, the current detector includes a circuit board 100, three sampling resistors 200 and six connectors 300, and the two connection ends of each sampling resistor 200 are respectively connected to a connector 300. The current detector can simultaneously detect the current of the three power lines of the electrical equipment, that is, the current detector can detect the current of the three-phase electrical equipment.

[0035] Designers can set the specific value of N according to actual needs. When N is greater than 1, the current detector can simultaneously detect the current of multiple power lines of the electrical equipment, improve the detection efficiency, reduce the size of the current detection equipment, and improve the flexibility of the current detector installation.

[0036] In some embodiments, Figure 1 and Figure 2 As shown, each connector 300 is provided with a through hole 301. The power line of the power supply device or the power line of the power consumption device can be connected to the connector 300 through the through hole 301. At the same time, bolts can be used to pass through the through hole 301 and connect to the screw holes on the vehicle, so that the connector 300 is fixed on the vehicle, thereby fixing the current detector on the vehicle.

[0037] In some embodiments, the connector 300 includes a metal sheet, and two connecting ends of the sampling resistor 200 are respectively connected to one metal sheet.

[0038] Specifically, the metal sheet has good conductivity and a small resistance. When the metal sheet connected to the two connection ends of the sampling resistor 200 is connected to the power supply device and the power consumption device respectively, the current output by the power supply device passes through the current detector to supply power to the power consumption device. At this time, the energy consumption on the metal sheet is small, reducing the energy consumption of the current detector.

[0039] Exemplarily, the material of the metal sheet may be copper, aluminum or an alloy material.

[0040] In some embodiments, the thickness of the sampling resistor 200 is the same as the thickness of the metal sheet, the cross-sections of the two connecting ends of the sampling resistor 200 are the same as the cross-section of the first end of the metal sheet, and the first end of the metal sheet is connected to one of the two connecting ends of the sampling resistor 200.

[0041] Specifically, the thickness of the sampling resistor 200 is the same as the thickness of the metal sheet, and the cross-sections of the two connection ends of the sampling resistor 200 are the same as the cross-section of the first end of the metal sheet. When the first end of the metal sheet is connected to one of the two connection ends of the sampling resistor 200, the first end of the metal sheet is welded to one of the connection ends of the sampling resistor 200 by laser welding technology, so that the sampling resistor 200 can be well connected to the metal sheet, and the resistance value between the sampling resistor 200 and the metal sheet is ensured to be small, thereby reducing the energy consumption of the current detector.

[0042] In some embodiments, the sampling resistor 200 includes a resistor body, two connection ends of the resistor body are respectively provided with a pin, and the connection points on the circuit board 100 are correspondingly connected to the pins on the two connection ends of the resistor body.

[0043] Specifically, the pins on the two connection ends of the resistor body are welded on the circuit board 100 to realize the connection between the sampling resistor 200 and the circuit board 100. The circuit board 100 may be provided with a through hole, and the pins on the two connection ends of the resistor body are respectively passed through the through holes on the circuit board 100 and then welded to realize the connection between the sampling resistor 200 and the circuit board 100.

[0044] Exemplarily, the resistor body can be a resistor made of manganese copper or copper nickel.

[0045] Exemplarily, the resistance of the sampling resistor 200 is 0.01 milliohms to 0.1 milliohms, ensuring that the resistance of the sampling resistor 200 is small, thereby reducing the energy consumption of the current detector. At the same time, when the power supply device supplies power to the power-consuming device, when the output current of the power supply device flows through the sampling resistor 200, a suitable voltage can be generated between the two connection ends of the sampling resistor 200, and the circuit board 100 can output a detection signal according to the voltage between the two connection ends of the sampling resistor 200, and the detection signal can represent the working current of the power-consuming device, thereby realizing the detection of the working current of the power-consuming device.

[0046] In some embodiments, the current detector further includes an insulating sleeve, which is sleeved on the pins of the sampling resistor 200 and is located between the resistor body and the circuit board 100 .

[0047] Specifically, the insulating sleeve plays an insulating role. The insulating sleeve is located between the resistor body and the circuit board 100, and can insulate the resistor body and the electrical components on the circuit board 100, thereby playing a role in protecting the resistor body and the electrical components on the circuit board 100.

[0048] In some embodiments, Figure 2 As shown, the current detector further includes a connector 400 , on which a plurality of electrical connectors are disposed. The plurality of electrical connectors on the connector 400 are respectively connected to a plurality of connection terminals on the circuit board 100 .

[0049] Specifically, the multiple terminals on the circuit board 100 may include multiple power terminals and multiple signal output terminals. The connector 400 may be provided with multiple electrical connectors, and the multiple electrical connectors on the connector 400 may include power electrical connectors and signal output electrical connectors. The multiple power electrical connectors on the connector 400 are correspondingly connected to the multiple power terminals on the circuit board 100, and the multiple signal output electrical connectors on the connector 400 are correspondingly connected to the multiple signal output terminals on the circuit board 100. The multiple power electrical connectors on the connector 400 can be connected to a power source to supply power to the circuit board 100. At the same time, the detection signal output by the circuit board 100 can be output through the multiple signal output electrical connectors on the connector 400.

[0050] Exemplarily, the electrical connector on the connector 400 may be a pin or a socket.

[0051] It should be noted that designers can select a suitable type of connector 400 according to actual needs, and the present application does not limit the number, shape, size and material of the connector 400.

[0052] In some embodiments, the current detector further includes a packaging shell, and the circuit board 100 , all sampling resistors 200 , and the connecting member 300 are all located in the packaging shell.

[0053] Specifically, the circuit board 100 and all the sampling resistors 200 are located in the packaging shell. A portion of each connector 300 is located in the packaging shell, and another portion is located outside the packaging shell. The packaging shell encapsulates the circuit board 100, the sampling resistor 200 and the connector 300, plays a role in protecting the circuit board 100 and the sampling resistor 200, thereby improving the overall stability of the current detector.

[0054] The present application also provides a motor control system, including the current detector described above. When using the current detector, the current detector is connected in series in the circuit to be detected, that is, the connector connected to one connection end of the sampling resistor is connected to the electrical device, and the connector connected to the other connection end of the sampling resistor is connected to the power supply device. The current output by the power supply device is transmitted to the electrical device through the connector and the sampling resistor to power the electrical device. When the current passes through the sampling resistor, a voltage signal is generated between the two connection ends of the sampling resistor. The circuit board will collect the voltage signal between the two connection ends of all sampling resistors, and output a detection signal based on the voltage signal between the two connection ends of the sampling resistor. The detection signal can characterize the working current of the electrical device, thereby completing the detection of the working current of the electrical device. When using a combination of a Hall sensor and a magnetic ring for current detection, the magnetic ring needs to be sleeved on the line to be detected, so the volume of the magnetic ring is large, resulting in limited installation. The current detector provided in the embodiment of the present application is composed of a circuit board, a sampling resistor and a connector. The circuit board, the sampling resistor and the connector can more easily achieve a lightweight design, thereby contributing to the flat design of the entire current detector, reducing the overall thickness of the current detector, achieving a miniaturized design of the current detector, and improving the flexibility of the installation of the current detector. For the specific principle, please refer to the above description of the current detector, which will not be repeated here.

[0055] The present application also provides a vehicle, including the motor control system described above. When using a current detector, the current detector is connected in series in the circuit to be detected, that is, the connector connected to one connection end of the sampling resistor is connected to the electrical device, and the connector connected to the other connection end of the sampling resistor is connected to the power supply device. The current output by the power supply device is transmitted to the electrical device through the connector and the sampling resistor to supply power to the electrical device. When the current passes through the sampling resistor, a voltage signal is generated between the two connection ends of the sampling resistor. The circuit board will collect the voltage signal between the two connection ends of all sampling resistors, and output a detection signal based on the voltage signal between the two connection ends of the sampling resistor. The detection signal can characterize the working current of the electrical device, thereby completing the detection of the working current of the electrical device. When using a combination of a Hall sensor and a magnetic ring for current detection, the magnetic ring needs to be sleeved on the line to be detected. Therefore, the volume of the magnetic ring is large, resulting in limited installation. The current detector provided in the embodiment of the present application is composed of a circuit board, a sampling resistor and a connector. The circuit board, the sampling resistor and the connector can more easily achieve a lightweight design, thereby contributing to the flat design of the entire current detector, reducing the overall thickness of the current detector, achieving a miniaturized design of the current detector, and improving the flexibility of the installation of the current detector. For the specific principle, please refer to the above description of the current detector, which will not be repeated here.

[0056] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A current detector, characterized in that: The circuit board comprises a circuit board, N sampling resistors and 2N connecting pieces, wherein the two connecting ends of each sampling resistor are respectively connected to one of the connecting pieces, and the multiple connecting points on the circuit board are respectively connected to the connecting ends of all the sampling resistors. The circuit board is used to output a detection signal according to a voltage signal between the two connecting ends of the sampling resistor, and N is an integer greater than or equal to 1.

2. The current detector according to claim 1, characterized in that: The connecting member comprises a metal sheet, and the two connecting ends of the sampling resistor are respectively connected to one of the metal sheets.

3. The current detector according to claim 2, characterized in that: The thickness of the sampling resistor is the same as that of the metal sheet, the cross section of the connection end of the sampling resistor is the same as that of the first end of the metal sheet, and the first end of the metal sheet is connected to one connection end of the sampling resistor.

4. The current detector according to claim 1, characterized in that: The sampling resistor comprises a resistor body, two connection ends of the resistor body are respectively provided with a pin, and the connection points on the circuit board are respectively connected to the pins on the two connection ends of the resistor body.

5. The current detector according to claim 4, characterized in that: The current detector further comprises an insulating sleeve, which is sleeved on the pins of the sampling resistor and is located between the resistor body and the circuit board.

6. The current detector according to claim 1, characterized in that: Each of the connecting pieces is provided with a through hole.

7. The current detector according to claim 1, characterized in that: The resistance of the sampling resistor is 0.01 milliohm to 0.1 milliohm.

8. The current detector according to any one of claims 1 to 7, characterized in that: The current detector further comprises a connector, on which a plurality of electrical connectors are arranged, and the plurality of electrical connectors on the connector are respectively connected to a plurality of connection terminals on the circuit board.

9. A motor control system, characterized in that: The invention comprises a current detector as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Includes the motor control system as described in claim 9.

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