Lamp panel driving assembly of vehicle lamp, vehicle lamp and vehicle

Abstract

The utility model discloses a lamp panel driving assembly, a vehicle lamp and a vehicle. The lamp panel driving assembly comprises a radiator, a cover plate and a circuit board. A switching power supply, a plug connector and an output interface are integrated on the circuit board; the second surface of the circuit board is provided with a first magnetic flux leakage position; the first magnetic flux leakage position is positioned on the outer edge of the output interface on the second surface, the outer edge of the plug connector on the second surface and a connecting line between the outer edge of the plug connector and the outer edge of the output interface; the first side face of the radiator is provided with a first conductive protrusion, and the projection of the first conductive protrusion on the first side face is the same as the projection of the first magnetic leakage position on the second face in shape. The radiator is provided with the first conductive protrusion, the circuit board is provided with the first magnetic leakage position, after the circuit board and the radiator are assembled, the first conductive protrusion is attached to the first magnetic leakage position, the first magnetic leakage position is grounded through the conductivity of the first conductive protrusion, and electromagnetism of the switching power supply cannot be radiated to the plug connector; therefore, electromagnetic shielding between the switching power supply and the plug connector is realized, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a lamp board driving component of a vehicle lamp, a vehicle lamp and a vehicle. Background Art

[0002] During the operation of the vehicle, the headlights can be used as vehicle lighting or as signal lights, playing a key role in the safe driving of the vehicle.

[0003] Currently, the light source in the car lamp is usually driven and powered by a DC-DC driver, and the driver is connected to a heat sink to dissipate heat from the driver and extend the service life of the driver.

[0004] However, DC-DC drivers are prone to radiating electromagnetic interference, which is not conducive to the rectification of electromagnetic compatibility (EMC) tests. The main function of the current heat sink is to dissipate heat. During the EMC test of the headlight, the heat sink cannot shield the conducted electromagnetic interference. Therefore, the electromagnetic interference generated by the loop of the DC-DC driver in the lamp board is easily coupled to the terminals of the power line and the CAN line, and then coupled to the input power and the CAN line through the wiring harness, which is easy to cause electromagnetic exceeding the standard during the EMC test.

[0005] Therefore, how to provide a lamp board driving component for a vehicle lamp that can shield the electromagnetic interference of the driver and thus improve product quality is a technical problem that needs to be urgently solved by skilled technicians. Utility Model Content

[0006] In view of this, the utility model provides a lamp board driving assembly for a vehicle lamp, which can shield the electromagnetic interference of the driver, thereby improving product quality. In addition, the utility model also provides a vehicle lamp and a vehicle having the above-mentioned lamp board driving assembly.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A lamp board driving assembly for a vehicle lamp, comprising: a heat sink, a cover plate, and a circuit board for driving a light source of the lamp board, wherein the circuit board is installed between the heat sink and the cover plate;

[0009] The circuit board integrates a switching power supply, a plug-in connector and an output interface, the first surface of the circuit board is bonded to the cover plate, and the second surface of the circuit board is bonded to the first side surface of the radiator;

[0010] The second surface of the circuit board has a first leakage magnetic position, and the first leakage magnetic position is located on the outer edge of the output interface on the second surface, the outer edge of the connector on the second surface, and the outer edge of the connector and the outer edge of the output interface. The first side surface of the heat sink has a first conductive protrusion that can be attached to the first leakage magnetic position, and the projection of the first conductive protrusion on the first side surface is the same as the projection shape of the first leakage magnetic position on the second surface.

[0011] Preferably, in the above-mentioned lamp board driving assembly, the outer edge of the connector has continuous first magnetic leakage positions in the circumferential direction;

[0012] and / or,

[0013] The connection line between the outer edge of the connector and the outer edge of the output interface is close to the switching power supply.

[0014] Preferably, in the above-mentioned lamp board driving assembly, the circumference of the edge of the first surface of the circuit board has a second magnetic leakage position;

[0015] The first side surface of the heat sink has a second conductive protrusion that can fit with the second magnetic leakage position, and a projection of the second conductive protrusion on the first side surface has the same shape as a projection of the second magnetic leakage position on the second surface.

[0016] Preferably, in the above-mentioned lamp board driving assembly, both ends of the first leakage magnetic position are in contact with the second leakage magnetic position, and the annular structure formed by the second leakage magnetic position is divided into two parts, and the switching power supply and the connector are respectively arranged in different parts of the annular structure.

[0017] Preferably, in the above-mentioned lamp board driving assembly, the switching power supply, the connector and the output interface are all arranged on the first surface of the circuit board, and the first leakage magnetic position is located at the projection of the connector and the output interface on the second surface.

[0018] Preferably, in the above-mentioned lamp board driving assembly, the first surface of the circuit board has a third magnetic leakage position arranged around the outer edge of the switching power supply;

[0019] The cover plate has a third conductive protrusion that can be attached to the third magnetic leakage position, and the projection of the third conductive protrusion on the cover plate has the same shape as the projection of the third magnetic leakage position on the first surface.

[0020] Preferably, in the above-mentioned lamp board driving assembly, the outer edge of the first surface of the circuit board has a fourth magnetic leakage position;

[0021] The cover plate has a fourth conductive protrusion that can be attached to the fourth magnetic leakage position, and the projection of the fourth conductive protrusion on the cover plate has the same shape as the projection of the fourth magnetic leakage position on the first surface.

[0022] Preferably, in the above-mentioned lamp board driving assembly, the switch power supply is connected to the heat sink at the position of the second surface through a thermal conductive adhesive;

[0023] And / or, the micro control unit of the circuit board is connected to the cover plate via a thermally conductive adhesive.

[0024] A vehicle lamp comprises a lamp board and a lamp board driving assembly, wherein the lamp board driving assembly is any of the lamp board driving assemblies described above.

[0025] A vehicle comprises a headlight, wherein the headlight is the headlight described above.

[0026] The utility model discloses a lamp board driving component in an embodiment, wherein a first conductive protrusion is arranged on a first side surface of a heat sink, and a first leakage magnetic position is arranged on the outer edge of the second surface of a connector of a circuit board, the outer edge of the second surface of an output interface, and a connecting line between the outer edge of the connector and the outer edge of the output interface. After the circuit board and the heat sink are assembled, the first conductive protrusion fits the first leakage magnetic position, and the conductivity of the first conductive protrusion is utilized to ground the first leakage magnetic position, so that the electromagnetic radiation of the switching power supply cannot be radiated to the connector and the output interface, thereby realizing electromagnetic shielding between the switching power supply and the connector and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a disassembled diagram of a light board driving assembly disclosed in the prior art;

[0029] Figure 2 It is a front view of the second surface of the circuit board of the light board driving assembly disclosed in the prior art;

[0030] Figure 3 It is a front view of a first side surface of a heat sink of a lamp panel driving assembly disclosed in an embodiment of the utility model;

[0031] Figure 4 It is a structural schematic diagram of a radiator disclosed in an embodiment of the utility model;

[0032] Figure 5 It is a structural schematic diagram of another direction of the radiator disclosed in the embodiment of the utility model;

[0033] Figure 6 It is a front view of the first surface of the circuit board disclosed in the embodiment of the utility model;

[0034] Figure 7 It is a structural schematic diagram of the cover plate disclosed in the embodiment of the utility model;

[0035] Figure 8 It is a front view of the cover plate disclosed in the embodiment of the utility model;

[0036] Fig. 9 It is an EMC test simulation diagram and a frequency parameter diagram disclosed in the embodiment of the utility model without a shielding structure;

[0037] Fig.10 It is an EMC test simulation diagram and a frequency parameter diagram of the shielding structure disclosed in the embodiment of the utility model.

[0038] Among them, 1 is a circuit board, 2 is a heat sink, and 3 is a cover plate;

[0039] 11 is the first surface, 12 is the second surface, 13 is the switching power supply, 14 is the connector, 15 is the output interface, 16 is the micro control unit, 111 is the third magnetic leakage position, 112 is the fourth magnetic leakage position, 121 is the second magnetic leakage position, 122 is the first magnetic leakage position, 21 is the first side surface, 22 is the second side surface, 211 is the first conductive protrusion, 212 is the second conductive protrusion, 213 is the first thermal conductive glue, 31 is the first through hole, 32 is the second through hole, 33 is the fourth conductive protrusion, 34 is the second thermal conductive glue, and 35 is the third conductive protrusion. DETAILED DESCRIPTION

[0040] The utility model discloses a lamp board driving component of a vehicle lamp, which can shield the electromagnetic interference of the driver, thereby improving the product quality. In addition, the utility model also discloses a vehicle lamp and a vehicle having the lamp board driving component.

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0043] During the operation of the vehicle, the headlights can be used as vehicle lighting or as signal lights, playing a key role in the safe driving of the vehicle.

[0044] Currently, the light source in the car lamp is usually driven and powered by a DC-DC driver, and the driver is connected to a heat sink to dissipate heat from the driver and extend the service life of the driver.

[0045] However, DC-DC drivers are prone to radiating electromagnetic interference, which is not conducive to the rectification of electromagnetic compatibility (EMC) tests. The main function of the current heat sink is to dissipate heat. During the EMC test of the headlight, the heat sink cannot shield the conducted electromagnetic interference. Therefore, the electromagnetic interference generated by the loop of the DC-DC driver in the lamp board is easily coupled to the terminals of the power line and the CAN line, and then coupled to the input power and the CAN line through the wiring harness, which is easy to cause electromagnetic exceeding the standard during the EMC test.

[0046] Specifically, EMC testing is also called electromagnetic compatibility (EMC) testing, which refers to the comprehensive assessment of the electromagnetic interference (EMI) and electromagnetic anti-interference (EMS) capabilities of electronic products. It is one of the most important indicators of product quality. The electromagnetic compatibility measurement system consists of a test site and test instruments.

[0047] Based on the above problems, Figures 1 to 8 As shown, the present application discloses a lamp board driving assembly for a vehicle lamp, comprising: a circuit board 1, a heat sink 2 and a cover plate 3.

[0048] The circuit board 1 is packaged between the heat sink 2 and the cover plate 3, and the heat sink 2 can dissipate heat for the circuit board 1. In the packaging process, the heat sink 2 and the circuit board 1 are grounded, that is, the heat sink 2 has an electromagnetic shielding function. Specifically, the first surface 11 of the circuit board 1 is bonded to the cover plate 3, and the second surface 12 of the circuit board 1 is bonded to the heat sink 2.

[0049] Specifically, the circuit board includes but is not limited to a printed circuit board (PCB) board or a PCB blank board that is mounted using surface mounting technology (SMT) or a PCBA (Printed Circuit Board Assembly) board that is obtained through the entire process of dual in-line packaging technology (DIP plug-in).

[0050] A switching power supply 13 , a plug-in connector 14 , an output interface 15 and a micro control unit 16 are integrated on the first surface 11 of the circuit board 1 .

[0051] The switching power supply 13 is a DC-DC switching power supply, which will radiate electromagnetic interference outward, and the electromagnetic interference radiated outward is easily coupled to the plug 14, and the electromagnetic interference is coupled to the power supply and the CAN line through the terminals of the power line and the CAN line in the plug 14. Figure 2 As shown, the second side 12 of the circuit board 1 has a first leakage magnetic position 122, and the first leakage magnetic position 122 is located on the outer edge of the second side 12 of the connector 14, the outer edge of the second side 12 of the output interface 15, and the outer edge of the connector 14 and the outer edge of the output interface 15. The connecting line is close to the switching power supply 13.

[0052] Figure 3 and Figure 4 The first side surface 21 of the heat sink 2 disclosed in the patent application is used to fit with the second surface 12, and the first side surface 21 has a first conductive protrusion 211, and the first conductive protrusion 211 fits with the first magnetic leakage position 122. The first conductive protrusion 211 fits with the first magnetic leakage position 122 and is connected to achieve electromagnetic shielding between the switching power supply 13 and the connector 14. It should be noted that the projection of the first conductive protrusion 211 on the first side surface 21 in the present application is the same as the projection of the first magnetic leakage position 122 on the second surface 12, and the projections in this article are all vertical projections.

[0053] In the present application, a first conductive protrusion 211 is provided on the first side surface 21 of the heat sink 2, and a first leakage magnetic position 122 is provided on the outer edge of the second surface 12 of the connector 14 of the circuit board 1, the outer edge of the second surface 12 of the output interface 15, and the outer edge of the connector 14 and the outer edge of the output interface 15. After the circuit board 1 and the heat sink 2 are assembled, the first conductive protrusion 211 fits with the first leakage magnetic position 122, and the first leakage magnetic position 122 is grounded by utilizing the conductivity of the first conductive protrusion 211, so that the electromagnetic radiation of the switching power supply 13 cannot be radiated to the connector 14 and the output interface 15, that is, electromagnetic shielding between the switching power supply 13 and the connector 14 is achieved, thereby improving product quality.

[0054] Combination Figures 2 to 4 As shown, the circumferential edge of the second surface 12 of the circuit board 1 in the present application has a second magnetic leakage position 121, and the first side surface 21 of the heat sink 2 has a second conductive protrusion 212 that can fit with the second magnetic leakage position 121. The projection of the second conductive protrusion 212 on the first side surface 21 has the same shape as the projection of the second magnetic leakage position 121 on the second surface 12. After the circuit board 1 and the heat sink 2 are assembled, the first conductive protrusion 211 fits with the first magnetic leakage position 122, and at the same time, the second magnetic leakage position 121 fits with the second conductive protrusion 212, which further improves the electromagnetic shielding effect between the switching power supply 13 and the connector 14, thereby improving product quality.

[0055] In some embodiments, the circuit board 1 and the radiator 2 are connected by screws, so both the circuit board 1 and the radiator 2 are provided with threaded holes. In order to improve the electromagnetic shielding effect, the threaded holes of the circuit board 1 and the radiator 2 in the present application are fitted and connected, and are grounded. The first conductive protrusion 211 is arranged around the circumferential arrangement of the connector 14, and is arranged around the circumferential arrangement of the output interface 15. The first conductive protrusion 211, the first leakage magnetic position 122, the second leakage magnetic position 121 and the second conductive protrusion 212 are all continuous and uninterrupted structures. Both ends of the first leakage magnetic position 122 are in contact with the second leakage magnetic position 121, and the annular structure formed by the second leakage magnetic position 121 is divided into two parts, and the switching power supply 13 and the connector 14 are arranged in different parts respectively.

[0056] The heights of the first conductive protrusion 211 and the second conductive protrusion 212 can be set according to different needs, as long as it can be ensured that after the circuit board 1 is connected to the heat sink 2, the first conductive protrusion 211 is in contact with the first leakage magnetic position 122, and the second conductive protrusion 212 is in contact with the second leakage magnetic position 121. The shapes of the first leakage magnetic position 122 and the second leakage magnetic position 121 can be set in combination with the shapes of the switching power supply 13, the connector 14 and the output interface 15 of the circuit board 1.

[0057] In order to improve the heat dissipation effect of the circuit board 1 and the radiator 2, in some embodiments, the second side 12 of the circuit board 1 and the first side 21 of the radiator 2 are connected by thermal conductive adhesive, and the heat conduction effect of the thermal conductive adhesive is utilized to improve the heat transfer effect between the circuit board 1 and the radiator 2.

[0058] See also Figures 1 to 4 As shown, the switch power supply 13 of the circuit board 1 is attached to the first side surface 21 of the heat sink 2 at the position and the vicinity of the second surface 12 through the first thermal conductive adhesive 213. The position of the first thermal conductive adhesive 213 is mainly concentrated at the heat source position of the circuit board 1, and the shape and size formed by the first thermal conductive adhesive 213 are not specifically limited here.

[0059] Combination Figure 5As shown, the second side 22 of the heat sink 2 has heat dissipation fins, and the shape and size of the heat sink 2 can be set in combination with the shape and size of the circuit board 1. Combined with the above description, the heat sink 2 in this application has not only a heat dissipation function but also an electromagnetic shielding function.

[0060] Combination Figures 6 to 8 As shown, the switch power supply 13 of the circuit board 1 in the present application forms a third magnetic flux leakage position 111 on the outer ring of the first surface 11, and the cover plate 3 has a third conductive protrusion 35 that can be fitted and connected with the outer ring of the switch power supply 13, and the projection of the third conductive protrusion 35 on the cover plate 3 is the same as the projection shape of the third magnetic flux leakage position 111 on the first surface 11. After the circuit board 1 is connected to the cover plate 3, the outer ring of the switch power supply 13 is fitted and connected with the third conductive protrusion 35, that is, the third conductive protrusion 35 is fitted with the third magnetic flux leakage position 111, which can realize the grounding of the switch power supply 13, and then realize the electromagnetic shielding of the switch power supply 13, further prevent the switch power supply 13 from radiating electromagnetic radiation to the connector 14, improve the effect of electromagnetic shielding, and then improve the product quality.

[0061] The edge of the first surface 11 of the circuit board 1 has a fourth magnetic leakage position 112 along the circumferential direction, and the cover plate 3 has a fourth conductive protrusion 33 that can be fitted and connected with the fourth magnetic leakage position 112, and the projection of the fourth conductive protrusion 33 on the cover plate 3 is the same as the projection shape of the fourth magnetic leakage position 112 on the first surface 11. Exemplarily, the contact surface where the circuit board 1 is connected to the cover plate 3 is a triangular structure at the top corner of the cover plate 3, and therefore, the fourth magnetic leakage position 112 is a triangular structure at the top corner of the first surface 11. After the circuit board 1 is connected to the cover plate 3, the fourth conductive protrusion 33 fits with the fourth magnetic leakage position 112, further preventing the switching power supply 13 from radiating electromagnetic radiation to the connector 14, improving the effect of electromagnetic shielding, and thus improving product quality.

[0062] The cover plate 3 and the microcontroller unit 16 are connected by a second heat-conducting adhesive 34, and the heat transfer effect of the second heat-conducting adhesive 34 is used to improve the heat transfer effect between the circuit board 1 and the cover plate 3. The cover plate 3 has a first through hole 31 and a second through hole 32. When the cover plate 3 and the circuit board 1 are attached, the plug-in component 14 passes through the second through hole 32, and the output interface 15 passes through the first through hole 31, so that the main part of the circuit board 1 is encapsulated by the cover plate 3 and the heat sink 2, and the plug-in component 14 and the output interface 15 are exposed, so that the circuit board 1 is connected to the external structure.

[0063] The light board driving assembly in the present application realizes electromagnetic shielding by simply contacting the leakage magnetic position with the conductive protrusion, without the need for an additional assembly process, thus helping to improve the assembly efficiency of the light board driving assembly.

[0064] Combination Fig. 9 and Fig.10 As shown, the blue line is the peak radiation intensity and the green line is the average radiation intensity. Fig. 9 Middle a picture and Fig.10 In Figure a, the horizontal axis is frequency, and the vertical axis is radiation intensity.

[0065] from Fig. 9 From Figure b, we can see that the minimum frequency corresponding limit (margin) is -7.93db, while Fig.10 The minimum limit (margin) corresponding to the frequency in Figure b is +1.4db. Therefore, it can be concluded that the light board driving component with the shielding structure of the present application has a better shielding effect in the EMC test.

[0066] In addition, a vehicle lamp is disclosed in an embodiment of the utility model, including a light board and a light board driving assembly, wherein the light board driving assembly is any of the light board driving assemblies mentioned above. Therefore, the vehicle lamp having the light board driving assembly also has all the above-mentioned technical effects, which will not be described one by one here.

[0067] In addition, the present application also discloses a vehicle, including the headlight disclosed in the above embodiment. Therefore, the vehicle with the headlight also has all the above technical effects, which will not be described one by one here.

[0068] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0069] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lamp panel driving assembly for a vehicle lamp, characterized in that: include: A heat sink, a cover plate, and a circuit board for driving the light source of the light board, wherein the circuit board is installed between the heat sink and the cover plate; The circuit board integrates a switching power supply, a plug-in connector and an output interface, the first surface of the circuit board is bonded to the cover plate, and the second surface of the circuit board is bonded to the first side surface of the radiator; The second surface of the circuit board has a first leakage magnetic position, and the first leakage magnetic position is located on the outer edge of the output interface on the second surface, the outer edge of the connector on the second surface, and the outer edge of the connector and the outer edge of the output interface. The first side surface of the heat sink has a first conductive protrusion that can be attached to the first leakage magnetic position, and the projection of the first conductive protrusion on the first side surface is the same as the projection shape of the first leakage magnetic position on the second surface.

2. The light board driving assembly according to claim 1, characterized in that: The outer edge of the connector has continuous first magnetic leakage positions in the circumferential direction; and / or, The connection line between the outer edge of the connector and the outer edge of the output interface is close to the switching power supply.

3. The light board driving assembly according to claim 1, characterized in that: The edge of the first surface of the circuit board has a second magnetic leakage position in the circumferential direction; The first side surface of the heat sink has a second conductive protrusion that can fit with the second magnetic leakage position, and a projection of the second conductive protrusion on the first side surface has the same shape as a projection of the second magnetic leakage position on the second surface.

4. The light board driving assembly according to claim 3, characterized in that: Both ends of the first magnetic leakage position are in contact with the second magnetic leakage position, and the annular structure formed by the second magnetic leakage position is divided into two parts. The switching power supply and the connector are respectively arranged in different parts of the annular structure.

5. The light board driving assembly according to any one of claims 1 to 4, characterized in that: The switching power supply, the connector and the output interface are all arranged on the first surface of the circuit board, and the first magnetic leakage position is located at the projection of the connector and the output interface on the second surface.

6. The light board driving assembly according to claim 5, characterized in that: The first surface of the circuit board has a third magnetic leakage position arranged around the outer edge of the switching power supply; The cover plate has a third conductive protrusion that can be attached to the third magnetic leakage position, and the projection of the third conductive protrusion on the cover plate has the same shape as the projection of the third magnetic leakage position on the first surface.

7. The light board driving assembly according to claim 6, characterized in that: The outer edge of the first surface of the circuit board has a fourth magnetic leakage position; The cover plate has a fourth conductive protrusion that can be attached to the fourth magnetic leakage position, and the projection of the fourth conductive protrusion on the cover plate has the same shape as the projection of the fourth magnetic leakage position on the first surface.

8. The light board driving assembly according to claim 7, characterized in that: The switch power supply is connected to the heat sink at the second surface through a thermal conductive adhesive; And / or, the micro control unit of the circuit board is connected to the cover plate via a thermally conductive adhesive.

9. A vehicle lamp, comprising a lamp board and a lamp board driving assembly, characterized in that: The light board driving component is the light board driving component as claimed in any one of claims 1 to 8.

10. A vehicle, comprising a lamp, characterized in that: The vehicle lamp is the vehicle lamp as claimed in claim 9.

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