Electromagnetic compatibility filter circuit structure and heat dissipation structure of electronic oil pump of motor vehicle

Abstract

The utility model provides a motor vehicle electronic oil pump electromagnetic compatibility filter circuit structure and a heat dissipation structure, a filter circuit is used for being arranged on a motor vehicle electronic oil pump control panel, and two ends of the filter circuit are respectively connected with a power supply anode and the ground; the filter circuit at least comprises two capacitors which are connected in series, one end is connected with the positive electrode of a power supply, the other end is grounded, and the rear stage is used for connecting a load, a power circuit and a drive circuit of an electronic oil pump motor. One end of the metal connecting sheet is arranged on the control panel and connected with the filter circuit, and the other end is connected with a motor stator of the electronic oil pump; the heat dissipation structure adopts a plastic shell, and the rear cover is formed by mixing and splicing metal cooling fins and an annular plastic cover. According to the filter circuit, the filter circuit of the electronic oil pump is connected with the stator of the motor through the metal connecting piece, and the problems that external interference signals are shielded insufficiently due to the absence of a metal shell and other products are interfered by self radiation of products are solved.

Description

Technical Field

[0001] This disclosure relates to the field of electronic oil pump technology, and more particularly to an electromagnetic compatibility filter circuit structure and heat dissipation structure for an electronic oil pump in motor vehicles. Background Technology

[0002] The main function of an electronic oil pump in a car is to lubricate or cool the transmission system, electric drive control system, and drive motor. However, the current main solutions for electromagnetic compatibility of electronic oil pumps are:

[0003] 1. The oil pump housing and controller heat dissipation cover are both designed to be made of metal to shield against external interference and conducted radiation. This structure increases the production and manufacturing costs of the product and also makes the electronic oil pump assembly heavier, which significantly reduces its relative competitiveness in the current competitive market environment.

[0004] 2. The oil pump housing and the controller heat dissipation cover are both designed with plastic materials. Currently, this design will lead to insufficient heat dissipation of the controller power devices, which may cause damage to the power devices under harsh operating conditions. At the same time, this structure on the market does not have special design for electromagnetic compatibility and cannot meet higher level electromagnetic compatibility requirements. Utility Model Content

[0005] The purpose of this disclosure is to provide an electromagnetic compatibility filter circuit structure and a heat dissipation structure for an electronic fuel pump in a motor vehicle, thereby solving the aforementioned problems existing in the prior art.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this disclosure are as follows:

[0007] This disclosure provides an electromagnetic compatibility (EMC) filter circuit structure for an electronic fuel pump in a motor vehicle. The EMC filter circuit is applied to the electronic fuel pump and is installed on the control board of the electronic fuel pump. The filter circuit includes at least: a first capacitor C1 and a second capacitor C2 connected in series. One end of the first capacitor C1 is connected to the positive terminal of the power supply, and one end of the second capacitor C2 is grounded. The two ends of the first capacitor C1 and the second capacitor C2 are also used to connect to the load, the power circuit, and the drive circuit of the electronic fuel pump motor.

[0008] A metal connecting piece, one end of which is used to pass through the control board and connect between the first capacitor C1 and the second capacitor C2, and the other end is used to connect to the stator of the motor of the electronic oil pump.

[0009] Exemplarily, the filter circuit further comprises: a third capacitor C3 and a fourth capacitor C4 connected in parallel with the first capacitor C1 and the second capacitor C2; the third capacitor C3 and the fourth capacitor C4 are connected in series, one end of the third capacitor C3 is connected to a positive electrode of a power supply, one end of the fourth capacitor C4 is connected to a ground, and one end of the metal connecting piece (400) is further connected between the third capacitor C3 and the fourth capacitor C4, and the other ends of the third capacitor C3 and the fourth capacitor C4 are further used for connecting a load, a power circuit and a driving circuit of a motor.

[0010] Exemplarily, the filter circuit further comprises: a fifth capacitor, a sixth capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a ninth capacitor and a tenth capacitor connected in parallel with the third capacitor and the fourth capacitor connected in series, and a differential mode filter inductor connected in series at a power supply end, two ends of the differential mode filter inductor are respectively connected to one end of the sixth capacitor and the seventh capacitor connected to a power supply, and two ends of the tenth capacitor are further used for connecting a load, a power circuit and a driving circuit.

[0011] In another aspect, the present disclosure provides a heat dissipation structure adopting the electromagnetic compatibility filter circuit as described above, and the heat dissipation structure comprises:

[0012] A housing is provided with a first accommodating cavity and a second accommodating cavity with an opening, and the second accommodating cavity is provided with a motor of an electronic oil pump.

[0013] A control board is arranged in the first accommodating cavity, and the control board is provided with the filter circuit.

[0014] The metal connecting piece is arranged in the housing and penetrates through the first accommodating cavity and the second accommodating cavity.

[0015] A rear cover is arranged on the opening of the first accommodating cavity, and the rear cover comprises:

[0016] A metal heat dissipation fin is arranged above the control board to cover high-power components.

[0017] A ring-shaped plastic cover is plasticized on the edge of the metal heat dissipation fin and is sealingly connected with the opening.

[0018] Exemplarily, the stator comprises: the ring-shaped support and the core, the ring-shaped support is plasticized on the outer periphery of the core, and the metal connecting piece is plasticized on the outer side of the ring-shaped support, and the other end of the metal connecting piece plasticized on the ring-shaped support is exposed to the outer side of the ring-shaped support and the core to be interference-connected.

[0019] Exemplarily, the ring-shaped support comprises: a ring-shaped accommodating body plasticized on the core, and a plurality of partitions are uniformly arranged on the outer side of the ring-shaped accommodating body and are attached to the outer side of the core in a circumferential direction.

[0020] The surface of the annular accommodating body near the first accommodating cavity is uniformly provided with a plurality of support plates in the circumferential direction, and the partition plates correspond to the support plates one by one.

[0021] Therefore, the metal connecting piece is plasticized in a support plate and a corresponding partition plate, and the other end of the metal connecting piece is provided with a protruding protrusion, which penetrates the corresponding partition plate and is connected with the iron core in an interference fit.

[0022] Illustratively, the support plate plasticizing the metal connecting piece vertically corresponds to the connecting hole connected to one end of the metal connecting piece of the control plate.

[0023] Illustratively, the support plate is arranged inside the surface of the annular accommodating body.

[0024] The metal connecting piece comprises a connecting section, a bending section and an extension section connected in sequence.

[0025] The connecting section is plasticized in a support plate, and one end of the connecting section away from the bending section penetrates the control plate and is electrically connected with the filter circuit.

[0026] The bending section is plasticized in the surface of the annular accommodating body along the radial direction.

[0027] The extension section is plasticized in the corresponding partition plate, and the extension section is provided with a protruding protrusion protruding towards the iron core, and the protrusion penetrates the partition plate and is connected with the iron core outside in an interference fit.

[0028] Illustratively, the metal heat sink comprises a heat dissipation cover and a heat dissipation body arranged on one side of the heat dissipation cover near the edge, and the heat dissipation cover and the heat dissipation body surround an accommodating space to accommodate a capacitor on the side surface of the control plate facing the metal heat sink. The side of the control plate away from the metal heat sink is provided with a power tube; the heat dissipation body is arranged above the position corresponding to the control plate and the power tube.

[0029] The beneficial effects of the embodiment of the present disclosure are:

[0030] The metal heat dissipation cover of the electronic oil pump rear cover of the embodiment of the present disclosure is spliced with the annular plastic cover, which does not increase the weight while ensuring heat dissipation and reducing the cost; the metal connecting piece connects the filter circuit of the control plate of the electronic oil pump with the stator of the motor, which makes up for the problem of shielding external interference signals and product self-radiation interference with other products caused by the absence of a metal shell. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of a motor vehicle electronic oil pump electromagnetic compatibility filter circuit structure provided by the embodiment of the present disclosure;

[0032] Figure 2 FIG. 6 is another structural schematic diagram of an electromagnetic compatibility filter circuit structure of an electronic oil pump of a motor vehicle according to an embodiment of the present disclosure;

[0033] Figure 3 FIG. 7 is a structural schematic diagram of a heat dissipation structure according to an embodiment of the present disclosure, in which (a) is the inside of a shell and (b) is a rear cover;

[0034] Figure 4 FIG. 8 is a structural schematic diagram of a rear cover of a heat dissipation structure according to an embodiment of the present disclosure;

[0035] Figure 5 FIG. 9 is a structural schematic diagram of a first accommodating groove in a shell of a heat dissipation structure according to an embodiment of the present disclosure;

[0036] Figure 6 FIG. 10 is a structural schematic diagram of a second accommodating groove in a shell of a heat dissipation structure according to an embodiment of the present disclosure;

[0037] Figure 7 FIG. 11 is a heat dissipation structure according to an embodiment of the present disclosure, in which (a) is a ring-shaped clamping plate and (b) is a structural schematic diagram of an electric motor assembly;

[0038] Figure 8 FIG. 12 is a structural schematic diagram of a stator of a heat dissipation structure according to an embodiment of the present disclosure;

[0039] Figure 9 FIG. 13 is a structural schematic diagram of a metal connecting plate of a heat dissipation structure according to an embodiment of the present disclosure;

[0040] Figure 10 FIG. 14 is a partial structural schematic diagram of a metal connecting plate connecting a stator of a heat dissipation structure according to an embodiment of the present disclosure;

[0041] Figure 11 FIG. 15 is a structural schematic diagram of an electronic oil pump of a motor vehicle according to an embodiment of the present disclosure;

[0042] Figure 12 FIG. 16 is an actual curve schematic diagram of a test on an electronic oil pump of a motor vehicle according to an embodiment of the present disclosure, in which the curve AVG represents the average value of the electronic oil pump in each test frequency band, the curve Peak represents the peak value of the electronic oil pump in each test frequency band, and the upper lines respectively represent the standard limits of the peak value, the standard peak value and the average value.

[0043] FIG. 17 is a structural schematic diagram of an electronic oil pump of a motor vehicle according to an embodiment of the present disclosure;

[0044] 100. Housing; 110. First receiving cavity; 120. Second receiving cavity; 200. Control board; 210. Capacitor; 300. Rear cover; 310. Metal heat sink; 311. Heat sink cover; 312. Heat sink body; 313. Receiving space; 320. Annular plastic cover; 400. Metal connecting piece; 410. Connecting section; 420. Bending section; 430. Extension section; 431. Protrusion; 500. Motor; 510. Rotor; 520. Stator; 521. Iron core; 522. Annular bracket; 5221. Support plate; 5222. Partition plate; 600. Annular clamping plate. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of this disclosure and are not intended to limit the embodiments of this disclosure.

[0046] Example 1, as Figure 1 As shown, this disclosure provides an electromagnetic compatibility (EMC) filter circuit structure for an electronic fuel pump in a motor vehicle. The EMC filter circuit is applied to the electronic fuel pump control board and is connected to the positive terminal of a power supply and ground, respectively. The filter circuit includes at least two capacitors: a first capacitor C1 and a second capacitor C2 connected in series. One end of the first capacitor C1 is connected to the positive terminal of the power supply, and one end of the second capacitor C2 is grounded. The two ends of the first capacitor C1 and the second capacitor C2 are also used to connect to a load, a power circuit, and the drive circuit of the electronic fuel pump motor. The power supply can be an external input power supply to the PCBA. A metal connecting piece 400 is provided, one end of which is used to pass through the control board 200 and connect to the connecting line between the first capacitor C1 and the second capacitor C2; the other end is used to connect to the stator 520 of the motor 500 of the electronic fuel pump.

[0047] The filtering circuit further includes: a third capacitor C3 and a fourth capacitor C4 connected in parallel with the first capacitor C1 and the second capacitor C2; the third capacitor C3 and the fourth capacitor C4 are connected in series, one end of the third capacitor C3 is connected to the positive terminal of the power supply, one end of the fourth capacitor C4 is grounded, one end of the metal connecting piece 400 is also connected to the connecting line between the third capacitor C3 and the fourth capacitor C4, and the two ends of the third capacitor C3 and the fourth capacitor C4 are also used to connect the load, the power circuit and the drive circuit of the motor.

[0048] The capacitance values of the capacitors can be actualized according to actual conditions to achieve the purpose of filtering corresponding electromagnetic waves. The capacitors C1, C2, C3 and C4 are filter capacitors at the end of the metal connecting piece of the oil pump. The capacitance values of the filter capacitors C1, C2, C3 and C4 used are all different, the capacitance value of C1 is 470 nF, the capacitance value of C2 is 220 nF, the capacitance value of C3 is 1 nF, and the capacitance value of C4 is 10 nF. The capacitors with different capacitance values are combined together to suppress the interference and radiation of different frequency bands. The capacitors C1 and C2 are connected in series and then connected in parallel between the positive and negative electrodes of the power supply. The capacitors C3 and C4 are connected in series and then connected in parallel between the positive and negative electrodes of the power supply. The capacitors C1 and C2 are connected together with the capacitors C3 and C4. The electrical network at the connection point between the capacitors C1 and C2 and the capacitors C3 and C4 is FILTER. The FILTER is connected together with one end of the metal connecting piece of the stator of the motor. The filter circuit of the embodiment of the disclosure optimizes the filter circuit, on the one hand, makes up for the deficiency of the metal shell in shielding external interference signals, and on the other hand, can achieve better electromagnetic compatibility performance than the metal shell.

[0049] As shown in Figure 2 the filter circuit further includes: a fifth capacitor, a sixth capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a ninth capacitor, and a tenth capacitor connected in parallel with the third capacitor and the fourth capacitor in series respectively, and a differential mode filter inductor connected in series at the power supply end, two ends of the differential mode filter inductor are respectively connected to one end of the sixth capacitor and the seventh capacitor connected to the power supply, and two ends of the tenth capacitor are further used to connect a load, a power circuit and a driving circuit. L1 is a differential mode filter inductor, which is often used in combination with Figure 2 In addition to C1, C2, C3 and C4, other capacitors (capacitors connected across the positive and negative lines) cooperate to form an LC filter network, attenuate noise in a specific frequency band, and improve power supply quality.

[0050] The differential mode power inductor plays a key filtering role in the power supply and signal circuit by hindering the propagation of differential mode noise. Its design needs to consider inductance value, current capacity and high frequency characteristics, and it often works in cooperation with other filter elements.

[0051] To ensure that the filter circuit system is EMC compliant and stable in operation. Understanding the difference between common mode inductors and their application scenarios can effectively guide circuit design and noise suppression strategies. Among them, the capacitors C7 and C8 are electrolytic capacitors. In the power supply circuit, electrolytic capacitors store energy through charge and discharge characteristics and release electrical energy when the load changes, stabilize the voltage, such as power filtering, to suppress interference caused by power supply changes.

[0052] Other main capacitors are ceramic capacitors with different capacitance values, such as small capacitance values for high frequency decoupling and noise suppression; larger capacitance value ceramic capacitors cooperate with electrolytic capacitors to cover a wider frequency band of filtering.

[0053] Figure 10 The contact points of the metal connecting piece and the motor stator can be seen in the control panel PCBA, which contains a filter circuit.

[0054] In order to make the metal connecting piece fully contact with the motor stator, the position where the metal connecting piece contacts with the motor stator is designed in a special shape, and the matching part with the motor stator is designed with a convex point to form an interference fit.

[0055] As shown in Figures 3 to 10 Another aspect of the present disclosure proposes a heat dissipation structure, which adopts the electromagnetic compatibility filter circuit as described above, and the heat dissipation structure comprises a shell 100, a control panel 200, a rear cover 300, a metal connecting piece 400 and a motor 500; as shown in Figure 5 and Figure 6 The first accommodating cavity 110 has an opening, the first accommodating cavity 110 accommodates the control panel 200, and the second accommodating cavity 120 accommodates the motor 500. As shown in Figure 3 The rear cover sealing cover is arranged at the opening; as shown in Figure 4 The rear cover 300 comprises a metal heat sink 310 and an annular plastic cover 320 wrapped around the edge of the metal heat sink 310, and the metal heat sink is close to the central area and covers the high-power components of the control panel, such as capacitors and power tubes, etc. The annular plastic cover is sealingly connected with the edge of the opening. As shown in Figure 12 The metal connecting piece is arranged in the shell and penetrates the first accommodating cavity 110 and the second accommodating cavity 120. The control panel is the PCBA of the electronic oil pump, which is provided with a filter circuit, a corresponding load, a power circuit and a motor driving circuit, etc.

[0056] Generally, the whole vehicle is grounded, the electronic oil pump is connected with the whole vehicle, and the shell, the rear cover and the like of the electronic oil pump are made of metal material, which is equivalent to the shell grounding of the electronic oil pump to shield external electromagnetic interference. The metal material makes the weight of the electronic oil pump assembly larger. The annular plastic cover of the present disclosure can be made of light and non-conductive materials such as plastic, and the shell can be made of light and non-conductive materials such as plastic. The rear cover is designed by splicing metal and plastic. The metal heat sink covers the related components of the control panel to effectively dissipate the heat generated by the control panel. The metal heat sink only occupies part of the structure of the rear cover, and the plastic shell and the metal heat sink are spliced with the annular plastic cover to reduce the overall weight of the electronic oil pump and control the cost. One end of the metal connecting piece penetrates the control panel and is connected with the electromagnetic compatibility filter circuit of the PCBA, and the other end is connected with the stator of the motor. The metal connecting piece separates the interference signals from the outside to the PCBA, which effectively suppresses the electromagnetic interference from the outside to the control panel, i.e. PCBA, and suppresses the radiation interference of the motor or the control panel to other components.

[0057] The electronic oil pump of the embodiment of the present disclosure meets all the functional conditions of the electronic oil pump, and on the basis of meeting all the functional conditions of the electronic oil pump, solves the electromagnetic compatibility and heat dissipation problems of the electronic oil pump, and also solves the problems of excessive weight and cost of the electronic oil pump.

[0058] As shown in Figure 3 The metal heat sink 310 includes a heat dissipation cover 311 and a heat dissipation body 312 arranged near the edge on one side of the heat dissipation cover 311. The heat dissipation cover 311 and the heat dissipation body 312 surround a containing space 313 to accommodate the capacitor 210 on the side of the metal heat sink 310 facing the control board 200. The side of the control board 200 facing away from the metal heat sink 310 is provided with a power tube. The heat dissipation body 312 is arranged above the position corresponding to the power tube on the control board 200. The heat dissipation cover and the heat dissipation body can be integrally formed.

[0059] It should be noted that the control board is provided with a capacitor on one side, which is the front side. The capacitor can be close to the central region of the control board. The top end of the capacitor is coated with heat dissipation glue. The space surrounded by the heat dissipation cover and the heat dissipation body of the metal heat sink accommodates the capacitor. The heat dissipation cover can be close to the top end of the capacitor. When the capacitor has a large volume and a high height, the height of the heat dissipation body will also increase. The bottom surface of the heat dissipation body is as close to the control board as possible to achieve better heat dissipation effect. The other side of the control board is provided with a power tube, which is the back side. The power tube can have multiple and be arranged adjacent to each other. The position corresponding to the power tube on the front side of the control board can be coated with heat dissipation glue. The heat dissipation body is arranged above the position corresponding to the power tube on the front side of the control board. There can be a gap between the bottom surface of the heat dissipation body and the control board to achieve better heat dissipation effect. The heat dissipation body of the metal heat sink is a support body structure extending in the direction away from the heat dissipation cover.

[0060] The filter circuit is close to the edge of the control board. One end of the metal connecting piece is connected to the filter circuit, and the other end of the metal connecting piece is connected to the outside of the stator.

[0061] The rear cover of the controller radiator of the embodiment of the present disclosure adopts a plastic and metal mixed design, which meets the needs of the controller radiator on the one hand, and greatly reduces the manufacturing and production costs on the other hand, while also reducing the overall weight of the electronic oil pump assembly.

[0062] As shown in Figure 7 and Figure 8As shown, the motor 500 includes, a stator 520 and a rotor 510 arranged in the stator 520 in a gap fit, the stator includes: the annular support 522 and the core 521, the annular support 522 is wrapped outside the core 521; The metal connecting piece 400 is wrapped outside the annular support 522, and the other end of the metal connecting piece 400 wrapped in the annular support 522 is exposed outside the annular support 522 and the core 521 and is connected in interference.

[0063] The structure of the annular support in the embodiment of the present disclosure matches the core, and can be set according to actual conditions.

[0064] The motor is also wrapped in the annular clamping plate 600, and the annular clamping plate further fixes the motor.

[0065] As shown, Figure 8 As shown, the annular support 524 includes: the annular support 522 includes: an annular containing body wrapped around the core 521, a plurality of partitions 5222 are uniformly arranged outside the annular containing body, and the partitions 5222 are attached to the circumferential outside of the core 521; A plurality of support plates 5221 are uniformly arranged on the surface of the annular containing body close to the first containing cavity 110, and the partitions 5222 and the support plates 5221 correspond one by one; Therefore, the metal connecting piece 400 is wrapped in a support plate and the corresponding partition 5222, and the other end of the metal connecting piece 40 is provided with a protruding protrusion 431, and the protrusion penetrates the corresponding partition 5222 and the core 521 in interference.

[0066] The annular support wraps the core and the metal connecting piece, and further stabilizes the metal connecting piece by wrapping the metal connecting piece through the support plate.

[0067] As shown, Figure 10 As shown, the support plate 5221 wrapping the metal connecting piece 400 vertically corresponds to the connecting hole connecting one end of the metal connecting piece 400.

[0068] The annular support wraps most of the structure of the metal connecting piece, so that the metal connecting piece remains stable. As shown, Figure 9 As shown, the metal connecting piece 400 includes: a connecting section 410, a bending section 420 and an extension section 430 connected in sequence, the connecting section penetrates the annular clamping plate; The connecting section 410 is wrapped in a support plate 5221, one end of the connecting section 410 away from the bending section 420 penetrates the control panel 200 and is electrically connected with the filter circuit, which can be connected by welding; The support plate penetrating the connecting section corresponds to the through hole of the control panel penetrating the metal connecting piece; so that the connecting section of the metal connecting piece is the shortest.

[0069] The bending section 420 is plastic-wrapped radially inward on the surface of the annular accommodating body; the extension section 430 is plastic-wrapped in the corresponding partition plate, and the extension section is provided with a protrusion 431 protruding towards the iron core 521, and the protrusion penetrates through the partition plate and is connected with the outside of the iron core 521 in an interference fit. The support plate and the corresponding partition plate exist at a certain distance in the radial direction, that is, the radial distance of one end of the annular accommodating body, and the metal connecting piece is bent, and the bending section is plastic-wrapped in one end of the annular accommodating body.

[0070] As shown in Figure 11 Another aspect of the embodiment of the present disclosure provides an electronic oil pump of a motor vehicle, which comprises the electromagnetic compatibility and heat dissipation structure as described above.

[0071] Other structures of the electronic oil pump can be set according to actual conditions, which will not be described here. In order to test the electronic oil pump of the embodiment of the present disclosure, an actual test bench for part of the test items in the electromagnetic compatibility test is built, which includes a low-voltage battery, an artificial network, an oil tank load and the electronic oil pump to be tested.

[0072] Figure 12 The actual test results of the electronic oil pump of the embodiment of the present disclosure according to the EMC test standard of GS95002-2 (2021) BWM show that the average value AVG and the peak value Peak in each test frequency band are within the standard range and do not exceed the upper standard limit values, such as the peak standard limit value Basic limit values-PK (dBuV), the quasi-peak standard limit value Basic limit values-QP (dBuV) and the average value standard limit value Basic limit values-AV (dBuV).

[0073] The embodiment of the present disclosure relates to the field of automotive electronic oil pumps, and relates to an electromagnetic compatibility and heat dissipation solution without signal common ground and metal shielding for a whole vehicle. The embodiment of the present disclosure optimizes the design of the filter circuit, which on the one hand makes up for the deficiency of the shielding of external interference signals caused by the absence of a metal shell, and on the other hand can achieve better electromagnetic compatibility performance than a metal shell. The rear cover of the controller radiator of the embodiment of the present disclosure adopts a plastic and metal mixed design, which on the one hand meets the demand of the controller radiator, and on the other hand greatly reduces the manufacturing and production cost, and also reduces the overall weight of the electronic oil pump assembly.

[0074] Embodiment two,

[0075] On the basis of embodiment one, the end surface of the heat dissipation body of the metal heat dissipation fin can be connected with the control panel through heat dissipation glue.

[0076] The above merely describes preferred embodiments of the present disclosure, and it should be noted that, for those of ordinary skill in the art, without departing from the principles of the present disclosure, a number of improvements and refinements can be made, and these improvements and refinements should also be considered within the protection scope of the present disclosure.

Claims

1. An electromagnetic compatibility filter circuit structure for an electronic oil pump of a motor vehicle, the electromagnetic compatibility filter circuit being applied to an electronic oil pump of a motor vehicle, characterized by, The filter circuit is used in a motor vehicle electronic oil pump control board, and two ends of the filter circuit are respectively connected to a positive electrode of a power supply and a ground; the filter circuit at least comprises: a first capacitor C1 and a second capacitor C2 connected in series; one end of the first capacitor C1 is connected to the positive electrode of the power supply, one end of the second capacitor C2 is connected to the ground, and two ends of the first capacitor C1 and the second capacitor C2 are further used for connecting a load, a power circuit and a driving circuit of an electronic oil pump motor; A metal connecting piece (400) is provided, one end of the metal connecting piece (400) is used for penetrating the control board (200) and is connected between the first capacitor C1 and the second capacitor C2, and the other end is used for connecting a stator (520) of a motor (500) of the electronic oil pump.

2. The filter circuit structure of claim 1, wherein, The filter circuit further comprises: a third capacitor C3 and a fourth capacitor C4 connected in parallel with the first capacitor C1 and the second capacitor C2; the third capacitor C3 and the fourth capacitor C4 are connected in series, one end of the third capacitor C3 is connected to the positive electrode of the power supply, one end of the fourth capacitor C4 is connected to the ground, one end of the metal connecting piece (400) is further connected between the third capacitor C3 and the fourth capacitor C4, and two ends of the third capacitor C3 and the fourth capacitor C4 are further used for connecting the load, the power circuit and the driving circuit of the motor.

3. The filter circuit structure of claim 2, wherein, The filter circuit further comprises: a fifth capacitor, a sixth capacitor, a seventh electrolytic capacitor, an eighth electrolytic capacitor, a ninth capacitor and a tenth capacitor connected in parallel with the third capacitor and the fourth capacitor connected in series, and a differential mode filter inductance connected in series at the power supply end, two ends of the differential mode filter inductance are respectively connected to one end of the sixth capacitor and the seventh capacitor connected to the positive electrode of the power supply, and two ends of the tenth capacitor are further used for connecting the load, the power circuit and the driving circuit.

4. A heat dissipating structure characterized by comprising: The electromagnetic compatibility filter circuit of any one of claims 1 to 3 is used, and the heat dissipation structure comprises: A shell (100) is provided with a first accommodating cavity (110) and a second accommodating cavity (120) with an opening in the shell (100); the second accommodating cavity (120) is provided with a motor (500) of an electronic oil pump; A control board (200) is provided in the first accommodating cavity (110), and the control board (200) is provided with the filter circuit; The metal connecting piece (400) is provided in the shell (100) and penetrates the first accommodating cavity (110) and the second accommodating cavity (120); A rear cover (300) is provided on the opening of the first accommodating cavity (110); the rear cover (300) comprises, A metal heat sink (310) is provided above the control board (200) to cover high-power components; A ring-shaped plastic cover (320) is molded on the edge of the metal heat sink (310) and is sealingly connected with the opening.

5. The heat dissipating structure according to claim 4, the stator (520) of the electric machine comprising: The annular support (522) and the core (521), the annular support (522) is plastic-coated on the outer periphery of the core (521); the metal connecting piece (400) is plastic-coated on the outside of the annular support (522), and the other end of the metal connecting piece (400) plastic-coated on the annular support (522) is exposed outside the annular support (522) and the core (521) to form an interference connection.

6. The heat dissipating structure according to claim 5, the annular support (522) comprising: The annular accommodating body plastic-coated on the core is uniformly provided with a plurality of partitions (5222) on the outside of the annular accommodating body, and the partitions (5222) are attached to the circumferential outside of the core (521); The annular accommodating body is uniformly provided with a plurality of support plates (5221) on the surface close to the first accommodating cavity (110) in the circumferential direction, and the partitions (5222) correspond to the support plates (5221) one by one. Therefore, the metal connecting piece (400) is plastic-coated on a support plate (5221) and a corresponding partition (5222), and the other end of the metal connecting piece (400) is provided with a protruding protrusion (431), and the protrusion (431) penetrates through the corresponding partition (5222) and the core (521) to form an interference connection.

7. The heat dissipating structure according to claim 6, wherein The support plate (5221) plastic-coated on the metal connecting piece (400) is vertically corresponding to the connecting hole connected to one end of the metal connecting piece (400) of the control panel (200).

8. The heat dissipating structure according to claim 7, wherein The support plate (5221) is arranged on the inside of the surface of the annular accommodating body; The metal connecting piece (400) comprises a connecting section (410), a bending section (420) and an extension section (430) connected in sequence; The connecting section (410) is plastic-coated in a support plate (5221), one end of the connecting section (410) away from the bending section (420) penetrates through the control panel (200) and is electrically connected with the filter circuit; The bending section (420) is plastic-coated on the surface of the annular accommodating body along the radial direction; The extension section (430) is plastic-coated in the corresponding partition, and the extension section is provided with a protrusion (431) protruding towards the core (521), and the protrusion penetrates through the partition and the outside of the core (521) to form an interference connection.

9. The heat dissipating structure according to any one of claims 4 to 8, wherein The metal heat sink (310) comprises a heat dissipation cover (311) and a heat dissipation body (312) arranged on one side of the heat dissipation cover (311) close to the edge, and the heat dissipation cover (311) and the heat dissipation body (312) surround an accommodating space (313) to accommodate the capacitor (210) on the side of the control panel (200) facing the metal heat sink (310), and the control panel (200) is provided with a power tube on the side away from the metal heat sink (310). The heat dissipation body (312) is arranged above the position corresponding to the power tube of the control panel (200).

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