An electric control device and electric drive system

Abstract

The utility model discloses an electric control device and electric drive system for solving the problem that the internal circuit and device arrangement of double motor double -way drive electric control are compact, electromagnetic interference is serious, the coupling degree of high voltage filter electromagnetic field space and interference source increases, leading to the easy failure of high voltage filter. The electric control device includes: high voltage filter, high voltage input interface, power distribution output interface and bus capacitor, the high voltage filter includes: as high voltage direct current bus's positive pole copper strip and negative pole copper strip, from the input end of positive pole copper strip, negative pole copper strip to output end, input side capacitor group and at least one pi type filter that connect in proper order, wherein, the input end of positive pole copper strip and negative pole copper strip is connected with high voltage input interface, the output end of positive pole copper strip and negative pole copper strip is connected with bus capacitor, input side capacitor group is connected with high voltage input interface and power distribution output interface respectively.

Description

Technical Field

[0001] This utility model relates to the field of vehicle drive control technology, and in particular to an electronic control device and an electric drive system. Background Technology

[0002] Electromagnetic interference (EMI) within the dual-motor, dual-drive electronic control system of new energy vehicles is more severe than that of single-drive systems. Furthermore, the miniaturization of the electronic control system and the increased demand for power distribution interfaces place higher demands on the design of high-voltage filters. Power distribution interfaces are typically powered by PCT (Positive Temperature Coefficient) thermistors or EAC (Electric Air Compressors), and are parallel to the DC bus input port. Due to high-voltage safety requirements, there is a certain distance between the power distribution interface and the DC bus input port. The high-voltage filtering components within the DC bus port cannot achieve adequate filtering at the power distribution interface output, thus transmitting EMI to the powered load. Miniaturization of the electronic control system and the compact arrangement of its internal circuits and modules increase the spatial coupling between interference sources such as the power drive section and the electromagnetic field of the high-voltage filter. If the electromagnetic field bypasses the high-voltage filter section or the entire circuit, it can lead to partial or complete filter failure. Utility Model Content

[0003] Based on this, an electronic control device is provided, the device comprising: a high-voltage filter, a high-voltage input interface, a power distribution output interface, and a bus capacitor; The high-voltage filter includes: a positive copper bar and a negative copper bar serving as a high-voltage DC bus, an input-side capacitor bank and at least one π-type filter connected sequentially from the input end of the positive copper bar and the negative copper bar to the output end; The input terminals of the positive and negative copper bars are connected to the high-voltage input interface, and the output terminals of the positive and negative copper bars are connected to the bus capacitor; the input-side capacitor bank is connected to the high-voltage input interface and the power distribution output interface, respectively.

[0004] Optionally, the input-side capacitor bank includes: common-mode capacitors C1 and C3 and differential-mode capacitor C2; wherein, one end of C1 and C3 is grounded, and the other ends of C1 and C3, which are not connected to each other, are respectively connected to the negative copper strip and the positive copper strip; both ends of C2 are respectively connected to the negative copper strip and the positive copper strip; one end of the negative copper strip and the positive copper strip connecting C1 and C3 is connected to the high-voltage input interface, and the other end of the negative copper strip and the positive copper strip connecting C1 and C3 is connected to the power distribution output interface.

[0005] Optionally, the π-type filter includes a first-stage capacitor bank, a first-stage magnetic ring, and a second-stage capacitor bank connected in sequence.

[0006] Optionally, when the high-voltage filter includes two π-type filters, the two π-type filters are cascaded; wherein, the two π-type filters include a first-stage capacitor bank, a first-stage magnetic ring, a second-stage capacitor bank, a second-stage magnetic ring, and a third-stage capacitor bank connected in sequence.

[0007] Optionally, each stage of the capacitor bank includes two common-mode capacitors and one differential-mode capacitor. One end of each pair of common-mode capacitors is grounded, and the other end of each pair of common-mode capacitors, which are not connected to each other, is connected to the negative copper strip and the positive copper strip, respectively. Both ends of each differential-mode capacitor are connected to the positive copper strip and the negative copper strip, respectively. The positive copper strip and the negative copper strip both pass through the magnetic ring of each stage.

[0008] Optionally, the first-stage magnetic ring is made of a ferrite material with low magnetic permeability, wherein the low magnetic permeability ranges from 1000H / m to 3000H / m.

[0009] Optionally, the second-stage magnetic ring is made of a ferrite material with high magnetic permeability, wherein the high magnetic permeability ranges from 5000H / m to 10000H / m.

[0010] Optionally, the device further includes: an isolation structure, a control and drive board, and a front housing; wherein the front housing has a main plane, the control and drive board is adjacent to the front housing in a first direction perpendicular to the main plane, and the control and drive board is connected to the bus capacitor; wherein the isolation structure divides the internal area of ​​the electronic control device into a high-voltage filter area and a drive and control board area, the high-voltage filter area includes the high-voltage filter, the high-voltage input interface, and the power distribution output interface, and the drive and control board area includes the bus capacitor and the control and drive board; the isolation structure has a head and a tail, the head is connected to the bus capacitor, and the tail is connected to the front housing; the total length from the head to the tail is less than or equal to 150 cm.

[0011] Optionally, the device further includes: an upper housing and a lower housing; the upper housing is located at the top of the high-voltage filter in a second direction, and the lower housing is located at the bottom of the high-voltage filter in the second direction, wherein the second direction is the stacking direction of the upper housing and the lower housing; the isolation structure includes: an upper partition and a lower partition; wherein the lengths of the upper partition and the lower partition in the second direction are both less than the distance between the upper housing and the lower housing; the upper partition extends from the upper housing toward the lower housing, and the lower partition extends from the lower housing toward the upper housing, wherein the lower bottom of the upper partition and the upper top of the lower partition are staggered and overlapped to form an overlapping portion; the length of the overlapping portion in the second direction is less than the lengths of the upper partition and the lower partition in the second direction.

[0012] Optionally, both the lower bottom and the upper top are provided with hook-shaped structures, and the hook-shaped structures and the overlapping portion form a receiving cavity.

[0013] This utility model also provides an electric drive system, which includes the aforementioned electronic control device, two motors, and two reducers.

[0014] The above-mentioned electronic control device design places the input-side capacitor bank close to the power distribution output interface, which enables it to absorb and suppress instantaneous large current pulsations and high-frequency noise at the source of the power distribution output interface, enhances the suppression of interference at the power distribution interface output line, and improves the overall filtering effect of electromagnetic interference inside the electronic control device. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the electronic control device 100 in one embodiment; Figure 2 This is a circuit topology diagram of high-voltage filter 1 in one embodiment; Figure 3 This is a schematic diagram of a vertical cross-section of the isolation structure 7 along the second direction y in one embodiment.

[0016] Reference numerals: 1. High voltage filter, 2. High voltage input interface, 3. Power distribution output interface, 4. Bus capacitor, 5. Control and drive board, 6. Low voltage interface, 7. Isolation structure, 8. Front housing, 9. Upper housing, 10. Lower housing, 71. Upper partition, 72. Lower partition, 73. Overlapping part, 74. Hook-shaped structure. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 present utility model and are not intended to limit the present utility model.

[0018] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] The structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0020] The terms "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," and "circumferential" used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the purpose of simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] Currently, electromagnetic interference within the electronic control systems of dual-motor, dual-path drive systems in new energy vehicles is more severe than that of single-motor, single-path drive systems. Furthermore, the miniaturization of the electronic control system and the increased demand for power distribution interfaces place higher demands on the design of high-voltage filters. The power distribution interface and the DC bus input port are in parallel. Due to high-voltage safety requirements, there is a certain distance between the power distribution interface and the DC bus interface. The high-voltage filter within the DC bus port cannot achieve a good filtering effect at the power distribution interface output, thus transmitting electromagnetic interference to the power supply load. Miniaturization of the electronic control system and the compact arrangement of its internal circuits and modules increase the spatial coupling between interference sources such as the power drive section and the electromagnetic field of the high-voltage filter. If the electromagnetic field bypasses the high-voltage filter section or the entire circuit, it can lead to partial or complete failure of the high-voltage filter.

[0022] Current high-voltage filter designs typically consist of capacitors and magnetic rings. Magnetic rings are made of materials such as nanocrystalline and ferrite. Using nanocrystalline magnetic rings to suppress low-frequency interference increases costs. Furthermore, the distribution interface suffers from poor filtering performance due to its distance from the high-voltage filter. In space-constrained conditions, the isolation barrier of the high-voltage filter cannot form a complete barrier, or the gaps are too long or too large, resulting in poor shielding and ultimately filter failure.

[0023] In view of this, the present invention provides an electronic control device to solve the problems of poor filtering effect at the internal power distribution interface of the electronic control and electromagnetic interference inside the electronic control.

[0024] Figure 1 This is a schematic diagram of the structure of an electronic control device 100 in one embodiment, including a high-voltage filter 1, a high-voltage input interface 2, a power distribution output interface 3, a bus capacitor 4, two control and drive boards 5, and a low-voltage interface 6. One end of the high-voltage filter 1 is connected to both the high-voltage input interface 2 and the power distribution output interface 3, and the other end is connected to the bus capacitor 4. The bus capacitor 4 is connected to the two control and drive boards 5, which are interconnected and connected to the low-voltage interface 6. The power distribution output interface 3 is commonly a PTC power distribution output interface.

[0025] In this invention, the high-voltage filter 1 includes: a positive copper bar and a negative copper bar serving as a high-voltage DC bus; an input-side capacitor bank connected sequentially from the input end to the output end of the positive and negative copper bars; and at least one π-type filter. In the high-voltage filter 1, the input ends of the positive and negative copper bars are connected to the high-voltage input interface 2, the output ends of the positive and negative copper bars are connected to the bus capacitor 4, and the input-side capacitor bank is connected to both the high-voltage input interface 2 and the power distribution output interface 3.

[0026] Figure 2 The circuit topology of the high-voltage filter 1 in one embodiment of this utility model includes: a positive copper bar and a negative copper bar serving as a high-voltage DC bus, and an input-side capacitor bank C connected sequentially from the input end of the positive copper bar and the negative copper bar to the output end. a and two-stage π-type filter (C b -L a -C c -L b -C d The input terminals of the positive and negative copper bars are connected to the positive and negative terminals of high-voltage input interface 2, respectively, i.e., high-voltage DC bus input HV+ and HV-. The output terminals of the positive and negative copper bars are connected to bus capacitor 4, i.e., high-voltage output HV OUT+ and HV OUT-. The two-stage π-type filter is composed of two cascaded π-type filters. The two-stage π-type filter includes the first-stage capacitor bank C connected in sequence. b First-stage magnetic ring L a Second-stage capacitor bank C c Second-stage magnetic ring L b and the third-stage capacitor bank C d .

[0027] Specifically, the input-side capacitor bank C aThis includes: common-mode capacitor C1, common-mode capacitor C3, and differential-mode capacitor C2. One end of both C1 and C3 is grounded, and the other ends of C1 and C3, which are not connected to each other, are connected to the negative and positive copper strips, respectively. The two ends of the differential-mode capacitor C2 are connected to the negative and positive copper strips, respectively. One end of the copper strip connected to C1 is connected to the negative terminal HV- of the high-voltage input interface 2, and the other end is connected to the positive terminal PTC+ of the PTC power distribution output interface 3. One end of the copper strip connected to C3 is connected to the positive terminal HV+ of the high-voltage input interface 2, and the other end is connected to the negative terminal PTC- of the PTC power distribution output interface 3.

[0028] First-stage capacitor bank C b This includes: common-mode capacitor C4, common-mode capacitor C6, and differential-mode capacitor C5. One end of C4 and C6 is grounded, and the other ends of C4 and C6, which are not connected to each other, are connected to the negative and positive copper strips, respectively. The two ends of differential-mode capacitor C5 are connected to the negative and positive copper strips, respectively. The second-stage capacitor bank C... c This includes: common-mode capacitor C7, common-mode capacitor C9, and differential-mode capacitor C8. One end of C7 and C9 is grounded, and the other ends of C7 and C9, which are not connected to each other, are connected to the negative and positive copper strips, respectively. The two ends of differential-mode capacitor C8 are connected to the negative and positive copper strips, respectively. This is the third-stage capacitor bank C. d This includes: common-mode capacitor C10, common-mode capacitor C12, and differential-mode capacitor C11. One end of both C10 and C12 is grounded, and the other ends of C10 and C12, which are not connected to each other, are connected to the negative and positive copper strips, respectively. The two ends of the differential-mode capacitor C11 are connected to the negative and positive copper strips, respectively. The first-stage magnetic ring L... a Located in the first stage capacitor bank C b Second-stage capacitor bank C c Between, the second-stage magnetic ring L b Located in the second stage capacitor bank C c and the third-stage capacitor bank C d Between them. Both the positive and negative copper bars pass through the first-stage magnetic ring L. a Second-stage magnetic ring L b .

[0029] In one embodiment, the first-stage magnetic ring L a It uses a low-permeability ferrite material, with a permeability range of 1000 H / m to 3000 H / m, for filtering high frequencies. The second-stage magnetic ring L... b It uses ferrite material with high magnetic permeability, ranging from 5000H / m to 10000H / m, to filter out low frequencies.

[0030] This utility model designs a C-type electronically controlled high-voltage filter with a PTC power distribution interface and a dual-motor drive. a -C b -L a-C c -L b -C d The circuit topology incorporates an input-side capacitor bank near the PTC power distribution output interface. This capacitor bank absorbs and suppresses noise at the PTC power distribution output interface, enhancing differential-mode and common-mode interference suppression. Input-side capacitor bank C a The subsequent topology uses a two-stage π-type filter, with the first stage capacitor bank C b Second-stage capacitor bank C c and the third-stage capacitor bank C d Filtering is performed on differential-mode and common-mode high and low frequency interference. The first-stage magnetic ring L in the two-stage magnetic ring is... a Low-permeability ferrite material is used to filter out high frequencies; the second-stage magnetic ring L b The use of ferrite material with high magnetic permeability to filter out low frequencies greatly improves the filtering effect of electromagnetic interference inside the dual-motor dual-path drive electronic control device, while reducing costs.

[0031] Combination Figure 1 In one embodiment, the electronic control device 100 further includes an isolation structure 7 and a front housing 8. The front housing 8 has a main plane, and the control and drive board 5 is adjacent to the front housing 8 in a first direction x perpendicular to the main plane. The isolation structure 7 is disposed between the high-voltage filter 1, the high-voltage input interface 2, and the power distribution output interface 3, the bus capacitor 4, and the control and drive board 5. The isolation structure 7 has a head and a tail, the head being connected to the bus capacitor 4, and the tail being connected to the front housing 8.

[0032] In one embodiment, the total length of the isolation structure 7 from its head to its tail is less than or equal to 150 cm. This is because the shielding effectiveness formula for the isolation structure 7 is: ,in, For shielding effectiveness, For the interference frequency wavelength, This refers to the length of the isolation structure. As the formula shows, the shielding effectiveness fails when the isolation structure length equals half the wavelength of the interference frequency. In engineering design, the isolation structure length is generally chosen to be less than 1 / 20 of the interference frequency wavelength. The inherent frequency and resonant frequency of the main electromagnetic interference sources inside the electronic control device are primarily considered to be between 150kHz and 100MHz. When the frequency f = 150kHz, the corresponding wavelength... =2000m, / 20=100m; when the frequency f=100MHz, the corresponding wavelength =3m, / 20=150cm. Therefore, the length of the isolation structure 7 cannot exceed 150cm.

[0033] Figure 3 In one embodiment, the isolation structure 7 is along the second direction y (see...). Figure 1 A vertical cross-sectional view of the device. The isolation structure 7 divides the interior of the electronic control unit 100 into a drive and control board area and a high-voltage filter area. Combined with... Figure 1 The electronic control device 100 also includes: an upper housing 9 and a lower housing 10 ( Figure 1 Not shown in the image. Figure 3 (As shown in the figure). The upper housing 9 is located at the top of the high voltage filter 1 in the second direction y, and the lower housing 10 is located at the bottom of the high voltage filter 1 in the second direction y, where the second direction y is the stacking direction of the upper housing 9 and the lower housing 10.

[0034] Figure 3 The intermediate partition structure 7 includes an upper partition 71 and a lower partition 72. The lengths of both the upper partition 71 and the lower partition 72 in the second direction y are less than the distance between the upper housing 9 and the lower housing 10. The upper partition 71 extends from the upper housing 9 towards the lower housing 10, and the lower partition 72 extends from the lower housing 10 towards the upper housing 9. The lower bottom of the upper partition 71 and the upper top of the lower partition 72 overlap in a staggered manner, forming an overlapping portion 73. The length of the overlapping portion 73 in the second direction y is less than the lengths of both the upper partition 71 and the lower partition 72 in the second direction y.

[0035] The dual-motor driven electronic control device has a miniaturized structure and compact internal layout. Due to space constraints, it is not possible to design a complete integrated isolation barrier structure. This utility model designs an isolation structure 7 with staggered and overlapping arrangements, which does not affect the arrangement of internal components of the electronic control device. At the same time, it can solve the problem that spatial coupling of various electromagnetic noises inside the electronic control device causes the high-voltage filter 1 to deteriorate or even fail, thus improving the filtering effect of electromagnetic interference inside the electronic control device.

[0036] In one embodiment, the lower bottom of the upper partition 71 and the upper top of the lower partition 72 are both provided with hook-shaped structures 74 (see Figure 3 The hook-shaped structure 74 and the overlapping portion 73 form a receiving cavity. In this invention, the shape of the hook-shaped structure 74 is not specifically limited; the shape of the hook-shaped structure 74 can be straight, as shown in the attached figure. Figure 3 The shape shown can also be an arc, a wave, or other shapes.

[0037] By setting a hook-shaped structure 74 to form a receiving cavity, electromagnetic interference will be further attenuated when it enters the receiving cavity, thereby strengthening the suppression of interference sources generated in the drive and control board area and improving the overall filtering effect of electromagnetic interference inside the electronic control device.

[0038] This utility model also provides an electric drive system, which includes the electronic control device 100 provided in any of the foregoing embodiments, two motors, and two reducers. The two motors are respectively connected to two control and drive boards 5 in the electronic control device 100. The two reducers are respectively connected to the two motors.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electronic control device, characterized in that, The device includes: a high-voltage filter, a high-voltage input interface, a power distribution output interface, and a bus capacitor; The high-voltage filter includes: a positive copper bar and a negative copper bar serving as a high-voltage DC bus, an input-side capacitor bank and at least one π-type filter connected sequentially from the input end of the positive copper bar and the negative copper bar to the output end; The input terminals of the positive and negative copper bars are connected to the high-voltage input interface, and the output terminals of the positive and negative copper bars are connected to the bus capacitor; the input-side capacitor bank is connected to the high-voltage input interface and the power distribution output interface, respectively.

2. The electronic control device according to claim 1, characterized in that, The input-side capacitor bank includes: common-mode capacitors C1 and C3 and differential-mode capacitor C2; In this configuration, one end of both C1 and C3 is grounded, and the other ends of C1 and C3, which are not connected to each other, are respectively connected to the negative copper bar and the positive copper bar; both ends of C2 are respectively connected to the negative copper bar and the positive copper bar; one end of the negative copper bar and the positive copper bar connecting C1 and C3 are both connected to the high-voltage input interface, and the other end of the negative copper bar and the positive copper bar connecting C1 and C3 are both connected to the power distribution output interface.

3. The electronic control device according to claim 1, characterized in that, The π-type filter includes a first-stage capacitor bank, a first-stage magnetic ring, and a second-stage capacitor bank connected in sequence.

4. The electronic control device according to claim 3, characterized in that, When the high-voltage filter includes two π-type filters, the two π-type filters are cascaded; wherein, the two π-type filters include a first-stage capacitor bank, a first-stage magnetic ring, a second-stage capacitor bank, a second-stage magnetic ring, and a third-stage capacitor bank connected in sequence.

5. The electronic control device according to any one of claims 3 or 4, characterized in that, Each stage of the capacitor bank includes two common-mode capacitors and one differential-mode capacitor. One end of each pair of common-mode capacitors is grounded, and the other end of each pair of common-mode capacitors, which are not connected to each other, is connected to the negative copper strip and the positive copper strip, respectively. The two ends of each differential-mode capacitor are connected to the positive copper strip and the negative copper strip, respectively. The positive copper strip and the negative copper strip both pass through the magnetic ring of each stage.

6. The electronic control device according to any one of claims 3-4, characterized in that, The first-stage magnetic ring is made of ferrite material with low magnetic permeability, wherein the low magnetic permeability ranges from 1000H / m to 3000H / m.

7. The electronic control device according to claim 4, characterized in that, The second-stage magnetic ring is made of ferrite material with high magnetic permeability, wherein the high magnetic permeability ranges from 5000H / m to 10000H / m.

8. The electronic control device according to claim 1, characterized in that, The device further includes: an isolation structure, a control and drive board, and a front housing; wherein, the front housing has a main plane, the control and drive board is adjacent to the front housing in a first direction perpendicular to the main plane, and the control and drive board is connected to the bus capacitor; The isolation structure divides the internal area of ​​the electronic control device into a high-voltage filter area and a drive and control board area. The high-voltage filter area includes the high-voltage filter, the high-voltage input interface, and the power distribution output interface. The drive and control board area includes the bus capacitor and the control and drive board. The isolation structure has a head and a tail, the head being connected to the bus capacitor and the tail being connected to the front housing; the total length from the head to the tail is less than or equal to 150cm.

9. The electronic control device according to claim 8, characterized in that, The device further includes an upper housing and a lower housing; the upper housing is located at the top of the high-voltage filter in a second direction, and the lower housing is located at the bottom of the high-voltage filter in the second direction, wherein the second direction is the stacking direction of the upper housing and the lower housing; The isolation structure includes an upper partition and a lower partition; wherein the lengths of the upper partition and the lower partition in the second direction are both less than the distance between the upper housing and the lower housing; the upper partition extends from the upper housing toward the lower housing, and the lower partition extends from the lower housing toward the upper housing, with the lower bottom of the upper partition and the upper top of the lower partition overlapping to form an overlapping portion; The length of the overlapping portion in the second direction is less than the lengths of the upper partition and the lower partition in the second direction.

10. The electronic control device according to claim 9, characterized in that, Both the lower bottom and the upper top are provided with hook-shaped structures, and the hook-shaped structures and the overlapping part form a receiving cavity.

11. An electric drive system, characterized in that, The electric drive system includes an electronic control device as described in any one of claims 1-10, two motors, and two reducers.

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