Vehicle-mounted motor device and interference suppression circuit for vehicle-mounted motor

Abstract

The utility model discloses a vehicle-mounted motor device and an interference suppression circuit of a vehicle-mounted motor. The interference suppression circuit comprises a control chip; the switch unit is coupled with the control chip, and the switch unit is arranged between the first power line and the second power line of the vehicle-mounted motor and the two ends of the vehicle-mounted motor and used for controlling the vehicle-mounted motor to work; the first end of the first suppression element is coupled with the first power line, and the second end of the first suppression element is coupled between the second power lines; the first end of the second suppression element is coupled with the first end of the vehicle-mounted motor, and the second end of the second suppression element is grounded; and the first end of the third suppression element is coupled with the second end of the vehicle-mounted motor, and the second end of the third suppression element is grounded. In this way, the transient emission interference voltage of the vehicle-mounted motor can be effectively suppressed.

Description

Technical Field

[0001] This application relates to the field of interference suppression technology, and in particular to vehicle-mounted motor devices and interference suppression circuits for vehicle-mounted motors. Background Technology

[0002] The number of electronic components in new energy vehicles is increasing, leading to a corresponding increase in vehicle wiring harnesses. Meanwhile, increasingly fierce price competition is driving cost reduction in the design of electronic components, resulting in a decrease in their anti-interference capabilities.

[0003] All electronic components generate electromagnetic interference during operation. Among these, transient emission interference from motors is the most common cause of malfunctions in vehicle control, entertainment, and electronic control systems. This phenomenon is mainly due to two factors: firstly, cost-cutting in the design of the interfering electronic components leads to excessive external interference; secondly, cost-cutting in the design of the affected electronic components results in weak anti-interference capabilities. Utility Model Content

[0004] This application provides an on-board motor device and an interference suppression circuit for the on-board motor, which can effectively suppress transient emission interference voltage of the on-board motor.

[0005] In a first aspect, this application provides an interference suppression circuit for a vehicle-mounted motor. The interference suppression circuit includes: a control chip; a switching unit coupled to the control chip, and the switching unit being disposed between a first power line, a second power line, and two ends of the vehicle-mounted motor for controlling the operation of the vehicle-mounted motor; a first suppression element, a first end of which is coupled to the first power line, and a second end of which is coupled to the second power line; a second suppression element, a first end of which is coupled to the first end of the vehicle-mounted motor, and a second end of which is grounded; and a third suppression element, a first end of which is coupled to the second end of the vehicle-mounted motor, and a second end of which is grounded.

[0006] The switching unit is a relay.

[0007] The relay includes: a first common contact coupled to a first end of the vehicle motor; a second common contact coupled to a second end of the vehicle motor; a first normally closed contact coupled to a second power line; a second normally closed contact coupled to the second power line; a first normally open contact coupled to a first power line; a second normally open contact coupled to the first power line; a first coil and a second coil, wherein the first coil is used to control the connection between the first common contact, the first normally closed contact, and the first normally open contact; and the second coil is used to control the connection between the second common contact, the second normally closed contact, and the second normally open contact.

[0008] The second suppression element is a unidirectional TVS diode.

[0009] The third suppression element is a unidirectional TVS diode.

[0010] The first suppression element is a bidirectional TVS diode.

[0011] The first suppression element is a varistor.

[0012] The interference suppression circuit also includes a diode, with the anode of the diode coupled to the first power supply line and the cathode of the diode coupled to the control chip.

[0013] The control chip is an MCU.

[0014] Secondly, this application provides an on-board motor device that includes the interference suppression circuit provided in the first aspect.

[0015] The beneficial effects of this application are as follows: Unlike the prior art, the vehicle motor device and the interference suppression circuit of the vehicle motor provided in this application are provided with grounded suppression elements on the first and second ends of the vehicle motor respectively. The suppression elements are used to suppress the transient emission interference generated by the motor operation, so as to avoid the interference being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of an electronic component with a motor in the related technology;

[0018] Figure 2 This is a schematic diagram of an embodiment of the interference suppression circuit for an on-board motor provided in this application;

[0019] Figure 3 This is a schematic diagram of the negative transient emission suppression return path of the motor provided by the interference suppression circuit in this application;

[0020] Figure 4 This is a schematic diagram of the backflow path for suppressing positive transient emission from the motor using the interference suppression circuit provided in this application;

[0021] Figure 5This is a schematic diagram of another embodiment of the interference suppression circuit for the vehicle motor provided in this application;

[0022] Figure 6 This is a schematic diagram of another embodiment of the interference suppression circuit for the vehicle motor provided in this application;

[0023] Figure 7 This is a schematic diagram of another embodiment of the interference suppression circuit for the vehicle motor provided in this application;

[0024] Figure 8 This is a schematic diagram of an embodiment of the vehicle-mounted motor device provided in this application. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] The number of electronic components in new energy vehicles is increasing, leading to a corresponding increase in vehicle wiring harnesses. Meanwhile, increasingly fierce price competition is driving cost reduction in the design of electronic components, resulting in a decrease in their anti-interference capabilities.

[0028] All electronic components generate electromagnetic interference during operation. Among these, transient emission interference from motors is the most common cause of malfunctions in vehicle control, entertainment, and electronic control systems. This phenomenon is mainly due to two factors: firstly, cost-cutting in the design of the interfering electronic components leads to excessive external interference; secondly, cost-cutting in the design of the affected electronic components results in weak anti-interference capabilities.

[0029] like Figure 1 As shown, path 1 is a transient emission interference that is directly conducted through the low-voltage power supply line to interfere with other electronic components. The motor generates interference → electronic component 5 → low-voltage wiring harness between components → electronic component 2.

[0030] like Figure 1 As shown, path 2 is transient emission interference that spatially couples with other cables through the low-voltage power supply line, causing interference to the motor → electronic component 5 → low-voltage wiring harness spatial coupling → electronic components 3 / 6.

[0031] like Figure 1 As shown, path 3 is where transient interference is conducted through the common ground terminal of the low-voltage power supply line, interfering with other electronic components. The motor generates interference → electronic component 5 → common ground terminal of the low-voltage wiring harness → electronic components 1 / 2 / 3 / 4 / 6.

[0032] These three pathways reveal that transient emission interference can cause malfunctions in electronic components 1 / 2 / 3 / 4 / 6. When cost-cutting measures lead to inadequate protection, these electronic components are prone to malfunction, potentially resulting in damage.

[0033] In terms of related technologies, under the trend of cost reduction or limited space, most electronic component ports do not place TVS diodes for interference suppression, while motor components usually have a TVS at the port.

[0034] Based on this, this application proposes to provide grounded suppression elements on the first and second ends of the vehicle motor, respectively. These suppression elements suppress transient emission interference generated during motor operation, preventing interference from being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components and solving at least one of the aforementioned technical problems. See the following embodiments for details.

[0035] See Figure 2 , Figure 2 This is a schematic diagram of an embodiment of the interference suppression circuit for an on-board motor provided in this application. The interference suppression circuit 100 includes: a control chip 10, a switching unit 20, a first suppression element 30, a second suppression element 40, and a third suppression element 50.

[0036] In some embodiments, the control chip 10 may be an MCU or a CPU, etc.

[0037] The switching unit 20 is coupled to the control chip 10 and is disposed between the first power line, the second power line, and both ends of the vehicle motor, for controlling the operation of the vehicle motor. In some embodiments, the first power line can be connected to the positive terminal, and the second power line can be connected to the negative terminal. That is, the switching unit 20 is disposed between the vehicle motor and the positive and negative terminals, for controlling the vehicle motor to rotate forward or backward when it is turned on.

[0038] The first end of the first suppression element 30 is coupled to the first power line, and the second end of the first suppression element 30 is coupled to the second power line.

[0039] The first end of the second suppression element 40 is coupled to the first end of the vehicle motor, and the second end of the second suppression element 40 is grounded.

[0040] The first end of the third suppression element 50 is coupled to the second end of the vehicle motor, and the second end of the third suppression element 50 is grounded.

[0041] Based on this, the first suppression element 30, the second suppression element 40 and the third suppression element 50 can effectively suppress the transient emission interference voltage of the vehicle motor when the vehicle motor is working.

[0042] In some embodiments, see Figure 3 The interference suppression circuit 100 mainly relies on the second suppression element 40 and the third suppression element 50 to suppress the negative transient emission of the motor. The transient emission interference return path is as follows: Figure 3 As shown, the negative transient emission of the motor is equivalent to a rise in the common ground potential for other electronic components. The motor exhibits the following characteristics in both forward and reverse rotation states: Figure 3 The two return paths shown (1 and 2) can control the negative transient emission interference voltage to within half of that in relevant technical solutions, greatly reducing the possibility of interference to other electronic components. Path 1 starts from the motor, flows through the switching unit 20, the grounding terminal, the third suppression element 50, and then returns to the motor. Path 2 starts from the motor, flows through the switching unit 20, the grounding terminal, the second suppression element 40, and then returns to the motor.

[0043] In some embodiments, see Figure 4 The interference suppression circuit 100 suppresses the positive transient emission return path of the motor as follows: Figure 4 As shown, compared to related technical solutions, the interference suppression circuit 100 adds loops for the second suppression element 40 and the third suppression element 50, which improves the circuit's current-carrying capacity while reducing the positive transient emission interference voltage of the motor, thereby better protecting other electronic components. Specifically, path 1 starts from the motor, flows through the switching unit 20, the first suppression element 30, the grounding terminal, the third suppression element 50, and then returns to the motor; and path 2 starts from the motor, flows through the second suppression element 40 and the third suppression element 50, and then returns to the motor.

[0044] In this embodiment, grounded suppression elements are respectively provided on the first and second ends of the vehicle motor. The suppression elements are used to suppress transient emission interference generated by the motor operation, so as to prevent the interference from being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components.

[0045] See Figure 5 , Figure 5 This is a schematic diagram of an embodiment of the interference suppression circuit for an on-board motor provided in this application. The interference suppression circuit 100 includes: a control chip 10, a relay 60, a first suppression element 30, a second suppression element 40, and a third suppression element 50.

[0046] Relay 60 is coupled to control chip 10, and corresponding contacts of relay 60 are connected to the first and second power lines of the vehicle motor, as well as both ends of the vehicle motor, for controlling the operation of the vehicle motor. In some embodiments, the first power line can be connected to the positive terminal, and the second power line can be connected to the negative terminal. That is, relay 60 is disposed between the vehicle motor and the positive and negative terminals, and is used to control the vehicle motor to rotate forward or backward when it is turned on.

[0047] In some embodiments, relay 60 may be equivalent to the switching unit 20 described above.

[0048] The first end of the first suppression element 30 is coupled to the first power line, and the second end of the first suppression element 30 is coupled to the second power line.

[0049] The first end of the second suppression element 40 is coupled to the first power supply line, and the second end of the second suppression element 40 is grounded.

[0050] The first end of the third suppression element 50 is coupled to the second power supply line, and the second end of the third suppression element 50 is grounded.

[0051] In some embodiments, the relay 60 includes: a first common contact, a second common contact, a first normally closed contact, a second normally closed contact, a first normally open contact, a second normally open contact, a first coil, and a second coil.

[0052] The first common contact is coupled to the first end of the vehicle motor.

[0053] The second common contact is coupled to the second end of the vehicle motor.

[0054] The first normally closed contact is coupled to the second power supply line.

[0055] The second normally closed contact is coupled to the second power supply line.

[0056] The first normally open contact is coupled to the first power supply line.

[0057] The second normally open contact is coupled to the first power supply line.

[0058] The first coil is used to control the connection between the first common contact, the first normally closed contact, and the first normally open contact.

[0059] The second coil is used to control the connection between the second common contact, the second normally closed contact, and the second normally open contact.

[0060] The principle behind relay 60 controlling the forward and reverse rotation of the motor is to change the direction of current flow. Specifically, relay 60 consists of two parts: a coil and contacts. When the coil is de-energized, the common contact is connected to the normally closed contact. When the coil is energized, the common contact is connected to the normally open contact. By controlling the energization of the relay 60's coil, the connection method of the contacts can be changed, thereby changing the direction of current flow and achieving forward and reverse rotation of the motor.

[0061] Detailed operation steps:

[0062] Forward rotation control: When the first coil is energized and the second coil is de-energized, the current flows from the positive terminal of the power supply through the first normally open contact to one end of the motor, and then from the other end of the motor through the second common contact and the second normally closed contact back to the negative terminal of the power supply, forming a circuit, and the motor rotates forward.

[0063] Reverse control: When the second coil is energized and the first coil is de-energized, the current flows from the positive terminal of the power supply through the second normally open contact to the other end of the motor, and then from this end of the motor through the first common contact and the first normally closed contact back to the negative terminal of the power supply, forming a circuit, and the motor reverses.

[0064] Stop: When both sets of coils are de-energized, the common contact connects with the normally closed contact (i.e., the first common contact connects with the first normally closed contact, and the second common contact connects with the second normally closed contact), the circuit is broken, and the motor stops rotating.

[0065] In this embodiment, grounded suppression elements are respectively provided on the first and second ends of the vehicle motor to suppress transient emission interference generated by the motor operation.

[0066] See Figure 6 , Figure 6 This is a schematic diagram of an embodiment of the interference suppression circuit for an on-board motor provided in this application. The interference suppression circuit 100 includes: a control chip 10, a relay 60, a bidirectional TVS diode D1, a unidirectional TVS diode D2, and a unidirectional TVS diode D3.

[0067] Relay 60 is coupled to control chip 10, and corresponding contacts of relay 60 are connected to the first and second power lines of the vehicle motor for controlling the operation of the vehicle motor. In some embodiments, the first power line can be connected to the positive terminal, and the second power line can be connected to the negative terminal. That is, relay 60 is disposed between the vehicle motor and the positive and negative terminals to control the vehicle motor to rotate forward or backward when it is turned on.

[0068] The first end of the bidirectional TVS diode D1 is coupled to the first power line, and the second end of the bidirectional TVS diode D1 is coupled to the second power line.

[0069] The first end of the unidirectional TVS diode D2 is coupled to the first end of the vehicle motor, and the second end of the unidirectional TVS diode D2 is grounded.

[0070] The first end of the unidirectional TVS diode D3 is coupled to the second end of the vehicle motor, and the second end of the unidirectional TVS diode D3 is grounded.

[0071] In some embodiments, the interference suppression circuit 100 mainly relies on unidirectional TVS diodes D2 and D3 to suppress the negative transient emission of the motor. The transient emission interference return path can be similar to... Figure 3 As shown, the negative transient emission of the motor is equivalent to a rise in the common ground potential for other electronic components. Similar phenomena exist in both the forward and reverse rotation states of the motor. Figure 3 The two return paths shown (1 and 2) can control the negative transient emission interference voltage to less than half of that in relevant technical solutions, greatly reducing the possibility of interference to other electronic components. Specifically, path 1 starts from the motor, flows through relay 60, the ground terminal, and the unidirectional TVS diode D3 before returning to the motor. Path 2 starts from the motor, flows through relay 60, the ground terminal, and the unidirectional TVS diode D2 before returning to the motor.

[0072] In some embodiments, the interference suppression circuit 100 can suppress the positive transient emission return path of the motor in a similar manner. Figure 4 As shown, compared to related technical solutions, the interference suppression circuit 100 adds loops for the unidirectional TVS tubes D2 and D3, which improves the circuit's current carrying capacity while reducing the positive transient emission interference voltage of the motor, thus better protecting other electronic components. Path 1 starts from the motor, flows through relay 60, bidirectional TVS tube D1, grounding terminal, unidirectional TVS tube D3, and then returns to the motor; and path 2 starts from the motor, flows through unidirectional TVS tubes D2 and D3, and then returns to the motor.

[0073] In this embodiment, grounded suppression elements are respectively provided on the first and second ends of the vehicle motor. The suppression elements are used to suppress transient emission interference generated by the motor operation, so as to prevent the interference from being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components.

[0074] See Figure 7 , Figure 7This is a schematic diagram of an embodiment of the interference suppression circuit for an on-board motor provided in this application. The interference suppression circuit 100 includes: a diode D4, a control chip 10, a switching unit 20, a first suppression element 30, a second suppression element 40, and a third suppression element 50.

[0075] The switching unit 20 is coupled to the control chip 10 and is disposed between the first power line, the second power line, and both ends of the vehicle motor, for controlling the operation of the vehicle motor. In some embodiments, the first power line can be connected to the positive terminal, and the second power line can be connected to the negative terminal. That is, the switching unit 20 is disposed between the vehicle motor and the positive and negative terminals, for controlling the vehicle motor to rotate forward or backward when it is turned on.

[0076] The first end of the first suppression element 30 is coupled to the first power line, and the second end of the first suppression element 30 is coupled to the second power line.

[0077] The first end of the second suppression element 40 is coupled to the first end of the vehicle motor, and the second end of the second suppression element 40 is grounded.

[0078] The first end of the third suppression element 50 is coupled to the second end of the vehicle motor, and the second end of the third suppression element 50 is grounded.

[0079] The anode of diode D4 is coupled to the first power supply line, and the cathode of diode D4 is coupled to the control chip 10.

[0080] In some embodiments, the first suppression element 30 may be a varistor.

[0081] In some embodiments, the control chip 10 can be an MCU.

[0082] In some embodiments, the relative position of the interference suppression circuit 100 can be as follows: Figure 1 At the external port of electronic component 5.

[0083] The control chip 10 can control the output polarity of the switching unit 20 to realize the forward and reverse rotation of the motor. Automotive electronic components must have reverse connection protection. When the power supply is reversed, the controlled switching unit 20 will be open-circuited without a signal from the control chip 10, and the power supply will not be short-circuited due to the second suppression element 40 and the third suppression element 50.

[0084] In this embodiment, grounded suppression elements are respectively provided on the first and second ends of the vehicle motor. The suppression elements are used to suppress transient emission interference generated by the motor operation, so as to prevent the interference from being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components.

[0085] See Figure 8 , Figure 8This is a schematic diagram of an embodiment of the vehicle-mounted motor device provided in this application. The vehicle-mounted motor device 1000 includes an interference suppression circuit 100.

[0086] In summary, the vehicle motor device 1000 and the interference suppression circuit 100 of the vehicle motor provided in this application are respectively provided with grounded suppression elements at the first and second ends of the vehicle motor. The suppression elements are used to suppress transient emission interference generated by the operation of the motor, so as to prevent interference from being conducted or coupled to other electronic components (vehicle control system, entertainment system, electronic control system, etc.), thereby better protecting other electronic components.

[0087] In the several embodiments provided in this application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0088] If the integrated units in the other embodiments described above are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor 10 to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0089] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An interference suppression circuit for a vehicle-mounted motor, characterized in that, The interference suppression circuit includes: Control chip; A switching unit is coupled to the control chip and is disposed between the first power line and the second power line of the vehicle motor and the two ends of the vehicle motor, for controlling the operation of the vehicle motor. A first suppression element, a first end of the first suppression element is coupled to the first power line, and a second end of the first suppression element is coupled to the second power line; The second suppression element has a first end coupled to the first end of the vehicle motor and a second end grounded. The third suppression element has a first end coupled to the second end of the vehicle motor, and the second end of the third suppression element is grounded.

2. The interference suppression circuit according to claim 1, characterized in that, The switching unit is a relay.

3. The interference suppression circuit according to claim 2, characterized in that, The relay includes: A first common contact is coupled to a first terminal of the vehicle-mounted motor. The second common contact is coupled to the second terminal of the vehicle motor. The first normally closed contact is coupled to the second power line; The second normally closed contact is coupled to the second power supply line; The first normally open contact is coupled to the first power line; The second normally open contact is coupled to the first power line; A first coil and a second coil, wherein the first coil is used to control the connection between the first common contact, the first normally closed contact and the first normally open contact; and the second coil is used to control the connection between the second common contact, the second normally closed contact and the second normally open contact.

4. The interference suppression circuit according to any one of claims 1-3, characterized in that, The second suppression element is a unidirectional TVS diode.

5. The interference suppression circuit according to any one of claims 1-3, characterized in that, The third suppression element is a unidirectional TVS diode.

6. The interference suppression circuit according to any one of claims 1-3, characterized in that, The first suppression element is a bidirectional TVS diode.

7. The interference suppression circuit according to any one of claims 1-3, characterized in that, The first suppression element is a varistor.

8. The interference suppression circuit according to any one of claims 1-3, characterized in that, The interference suppression circuit further includes: A diode, wherein the anode of the diode is coupled to the first power line and the cathode of the diode is coupled to the control chip.

9. The interference suppression circuit according to any one of claims 1-3, characterized in that, The control chip is an MCU.

10. A vehicle-mounted motor device, characterized in that, The vehicle-mounted motor unit includes the interference suppression circuit as described in any one of claims 1-9.

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