CN111446902B - AC-DC coupling integrated EMI filter for motor driving system - Google Patents
AC-DC coupling integrated EMI filter for motor driving system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/50—Reduction of harmonics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention provides an alternating current-direct current coupling integrated EMI filter for a motor driving system, which comprises a metal shell (1), a common mode inductor (2) and a capacitor PCB (printed circuit board) (3), wherein the metal shell is supported, installed and insulated through a first dielectric plate (4) and a second dielectric plate (5). The common-mode inductor (2) comprises two layers of nanocrystalline magnetic ring groups (21), a horizontal winding printing plate (22) and a vertical winding copper bar (23), and five windings of the common-mode inductor (2) are formed together. Compared with the prior art, the invention realizes the coupling of the alternating current and direct current inductors by commonly surrounding the two common mode inductance windings connected in series in the single-phase positive and negative buses and the three common mode inductance windings connected in series in the three-phase alternating current phase line on the same magnetic core group, thereby integrating the two common mode inductances in the prior art into one magnetic element in a magnetic integration mode, reducing the number of elements in the EMI filter and realizing the miniaturization of the EMI filter.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an alternating current-direct current coupled integrated EMI filter which is suitable for a motor driving system of an electric vehicle.
Background
The motor driving system of the electric vehicle consists of a direct current power supply, an inverter and a three-phase motor, wherein when the inverter works normally, a switching device is quickly switched on and off to form steep pulses with very high amplitude, and the generated electromagnetic interference has wide frequency band and large energy and is a main interference source in the vehicle. If the noise generated by the inverter is not suppressed, the common mode noise is conducted to different sensitive devices along the single-phase direct current bus and the three-phase alternating current phase line of the electric drive system: the common-mode noise is conducted into the direct-current power supply along the direct-current bus, so that damage is caused to the battery pack and the service life of the battery is influenced; the common mode noise is also conducted to the three-phase motor along the three-phase ac phase line, and generates a large shaft current through a parasitic capacitance between a motor bearing and a housing, corroding the bearing of the motor.
The EMI filter arranged in the electric drive system can reduce common-mode current and form a low-impedance path for multiple harmonics so as to achieve the effect of suppressing electromagnetic interference. At present, an EMI filter with excellent performance is a necessary guarantee for normal work of an electric drive system platform, and the filter has a good filtering effect, and also can guarantee small volume and weight, high power density and long-time safe and stable work. However, the traditional passive EMI filter adopts a discrete component arrangement manner, has disadvantages of large geometric size, low space utilization rate and low power density, and particularly, the disadvantages are more obvious in the era background of high-frequency and compact high-power electric drive platforms of hundreds kW at present. If a filter is added to each of the dc bus and the ac phase line of the electric drive system, the total volume of the electric drive system will be greatly increased, and even in some cases, the total filter volume will be no less than the volume of the electric drive system itself, which is a serious problem for electric vehicles whose space is very limited.
In order to reduce the size and improve the performance of the EMI filter, many scholars at home and abroad research on various aspects such as different-performance magnetic material combination, winding/implementation modes of windings, and integration of the windings and capacitors. The winding/realization mode of the winding is an integrated mode, the strategy is to realize the winding of the filter in a connection mode of PCB through holes-horizontal wiring, and the mode can bury the magnetic core of the filter in the PCB, thereby greatly improving the production efficiency; the magnetic core is punched, and the winding penetrates through the magnetic core in another winding mode, so that high-frequency loss of the magnetic core can be utilized, and higher insertion loss is provided; another way to integrate magnetoelectric units is to lay a high dielectric constant film between the windings to achieve a capacitive effect. However, the above approaches are strategies for volume optimization of a single filter, and when there are multiple filters, the volume optimization approaches are yet to be studied.
In the face of the problem of electromagnetic compatibility of a plurality of power electronic devices in an electric drive system, the conventional EMI filter for a single noise source and a single sensitive device is difficult to meet such a multi-target electromagnetic compatibility requirement, so that reducing the electromagnetic noise of a plurality of sensitive devices by using as few devices as possible is also a problem to be solved in practical application. The invention discloses an EMI filter for a motor controller, which is a patent application with the application publication number of CN108183604A and the name of the EMI filter for the motor controller. The EMI filter for the motor controller realizes the function of simultaneously inhibiting electromagnetic interference of the direct current bus and the alternating current phase line, but the integrated mode is only to simply place the two filters on the direct current bus and the alternating current phase line in a large cavity in parallel, the total volume of the two filters is not effectively reduced, and the EMI filter is only optimized in installation layout and connection mode.
Disclosure of Invention
The present invention is directed to provide an ac/dc coupling integrated EMI filter for a motor drive system, which aims to reduce the number of magnetic elements in the filter and to miniaturize the EMI filter while ensuring the insertion loss performance of the filter.
In order to achieve the purpose, the invention adopts the technical scheme that:
an AC-DC coupling integrated EMI filter for a motor driving system comprises a metal shell 1, and a common mode inductor 2 and a capacitor PCB 3 which are positioned inside the metal shell 1; the capacitor PCB 3 is fixed above the common mode inductor 2 through a first dielectric plate 4; the common mode inductor 2 is fixed at the bottom of the metal shell 1 through a second dielectric plate 5, wherein:
the common mode inductor 2 comprises a magnetic core group and five windings; the magnetic core group comprises two layers of nanocrystalline magnetic ring groups 21 which are mutually laminated, and each layer of nanocrystalline magnetic ring group 21 is composed of at least two nanocrystalline magnetic rings which are arranged in parallel; the five windings comprise horizontal winding printing plates 22 which penetrate through the magnetic ring windows of each layer of nanocrystalline magnetic ring group 21, a plurality of first terminals are respectively fixed on the edge parts of a group of opposite sides of the horizontal winding printing plates 22 along the direction of the magnetic ring windows, a vertical winding copper bar 23 is fixed on each first terminal, and the vertical winding copper bar 23 on each edge part comprises five interface winding copper bars 231 and at least five connecting winding copper bars 232; each pair of interface winding copper bars 231 on the left side and the right side of the common mode inductor 2 are connected with the multilayer copper lines on the horizontal winding printed board 22 and the adjacent connecting winding copper bars 232 end to respectively form five windings of the common mode inductor 2; the two windings are connected in series in a single-phase direct-current positive and negative bus connected with the inverter and the direct-current power supply through an interface winding copper bar 231 and used for reducing common-mode current on a single-phase direct-current cable in the motor driving system; the other three windings are connected in series in a three-phase alternating current phase line connected with the inverter and the three-phase motor through an interface winding copper bar 231 and used for reducing common mode current on a three-phase alternating current cable in a motor driving system; the common mode inductor 2 is surrounded on the same magnetic core group 21 through two windings in series connection in a single-phase positive bus and a single-phase negative bus and three windings in series connection in a three-phase alternating current phase line, so that the coupling of alternating current and direct current inductors is realized;
the capacitor PCB 3 comprises a direct current output capacitor bank 31, a direct current input capacitor 32 and an alternating current output capacitor bank 33; the direct current output capacitor group 31 is bridged between a positive bus and a negative bus of a direct current power supply of the motor driving system and the metal shell 1, and is used for bypassing a common mode current flowing to the direct current power supply; the direct current input capacitor 32 is bridged between a positive bus and a negative bus of an inverter of the motor driving system and is used for absorbing voltage overshoot caused by leakage inductance of the common mode inductor 2; the alternating current output capacitor group 33 is bridged between the three-phase line of the three-phase motor of the motor driving system and the metal casing 1, and is used for bypassing the common mode current flowing to the three-phase motor.
In the above-mentioned ac/dc coupling EMI filter for a motor driving system, the horizontal winding printed board 22 is implemented by using a multilayer PCB process, in which multiple copper lines are overlapped together to form the horizontal winding required by the common mode inductor 2.
In the above ac-dc coupling EMI filter for a motor driving system, the dc output capacitor bank 31 and the ac output capacitor bank 33 have the following specific structures:
the dc output capacitor bank 31 includes two sets of X capacitors 311, one set of Y capacitors 313, and three bleed resistors 312; one end of each of the two groups of X capacitors 311 and the two bleed-off resistors 312 is connected to a positive bus and a negative bus of the dc power supply, and the other end is connected in parallel; a group of Y capacitors 313 and a bleeder resistor 312 are connected in parallel across the X capacitor 311 and between the junction and the metal shell 1;
the ac output capacitor bank 33 includes three groups of X capacitors 331, one group of Y capacitors 333, and four bleeder resistors 332; one end of each of the three groups of X capacitors 331 and the three bleed-off resistors 332 is connected to a three-phase line of the motor, and the other end is connected in parallel; a group of Y capacitors 333 and a bleeder resistor 332 are connected in parallel across the X capacitor 331 and between the junction and the metal housing 1.
In the above ac/dc coupling EMI filter for a motor driving system, the capacitor PCB 3 is fixed with five second terminals 35 at edge portions of a set of opposite sides along the magnetic ring window direction of the nanocrystalline magnetic ring set 21, the capacitor PCB 3 is disposed right above the common mode inductor 2, and is connected and fixed with ten vertical interface winding copper bars 231 of the common mode inductor 2 through the ten second terminals 35.
Compared with the prior art, the invention has the following advantages:
1. the invention realizes the coupling of AC and DC inductors by surrounding two common mode inductance windings in series connection in a single-phase positive and negative bus and three common mode inductance windings in series connection in a three-phase AC phase line on the same magnetic core group, thereby integrating two common mode inductances in the prior art into one magnetic element in a magnetic integration mode, reducing the number of elements in an EMI filter and realizing the miniaturization of the EMI filter.
2. The winding of the common mode inductor adopts a mode of combining a multilayer PCB (printed circuit board) process and a copper bar cutting process, and the number of turns of the winding of the common mode inductor can be increased to a certain extent in a limited volume, so that the common mode inductance and the anti-saturation capacity in a unit volume are increased.
3. According to the invention, the PCB integrated with the capacitors of the input and output ends of the EMI filter is horizontally arranged right above the common-mode inductor, and the second terminal which is small and has enough current-carrying capacity is electrically connected with the common-mode inductor, so that the space utilization rate in the filter shell is further improved, and the total volume of the EMI filter is further reduced.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a common mode inductor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a common mode inductor winding structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a capacitor PCB of the present invention;
fig. 5 is a connection diagram of the present invention and a motor drive system.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, the present invention includes a metal case 1, a common mode inductor 2, a capacitor PCB board 3, a first dielectric board 4, and a second dielectric board 5.
The metal shell 1 is composed of side plates on two sides, a base and square sleeve sheet metal parts, the assembly mode of the metal shell is that a plurality of bolts are connected, and after the manufacturing cost, the mechanical strength and the shielding effectiveness are comprehensively considered, stainless steel is selected as a material for manufacturing the metal shell.
The common mode inductor 2 is shown in fig. 2 and comprises a magnetic core group and five windings. The magnetic core group comprises two layers of nanocrystalline magnetic ring groups 21 which are mutually laminated, and each layer of nanocrystalline magnetic ring group 21 consists of at least two nanocrystalline magnetic rings which are arranged in parallel; in order to prevent the performance of the nanocrystalline strip material in the magnetic ring from being reduced due to too wide width, and ensure enough magnetic path sectional area of the magnetic core group, each layer of nanocrystalline magnetic ring group 21 in the embodiment adopts four nanocrystalline magnetic rings arranged in parallel to jointly form a magnetic core group with enough magnetic path sectional area, and simultaneously, in order to enable the common mode inductor 2 to have enough anti-saturation capacity and filtering capacity, a nanocrystalline material with initial permeability of 60000 and saturation magnetic induction of 1.2T is selected; the five windings comprise horizontal winding printing plates 22 which penetrate through the magnetic ring windows of each layer of nanocrystalline magnetic ring group 21 and are realized by adopting a multilayer PCB (printed circuit board) process, wherein multiple layers of copper circuits are overlapped together to form the horizontal winding required by the common mode inductor 2; a plurality of first connecting terminals are respectively fixed at the edge parts of a group of opposite sides of the horizontal winding printing plate 22 along the window direction of the magnetic ring, a vertical winding copper bar 23 is fixed on each first terminal, and the vertical winding copper bar 23 at each edge part comprises five interface winding copper bars 231 and at least five connecting winding copper bars 232 which are arranged at intervals; as shown in fig. 3, each winding is connected in such a manner that each pair of interface winding copper bars 231 on the left and right sides is connected to the corresponding multilayer copper lines on the horizontal winding printed board 22 through the first terminal, and each pair of connection winding copper bars 232 on the left and right sides of the common mode inductor 2 is also connected to the corresponding multilayer copper lines on the horizontal winding printed board 22 through the first terminal, so as to form five windings of the common mode inductor 2, and thus, full coupling of the five windings is achieved. Because the length and the height of the magnetic core group window can be changed according to the number of turns of the inductance winding, if the number of turns of each inductance winding is too large, the length of the magnetic core window can be increased along with the change, the length of a magnetic circuit of the magnetic core group is too long, and therefore the common-mode inductance value is reduced; if the number of turns of each inductor winding is only one, the common mode inductance itself is relatively small. Therefore, in order to control the magnetic path length of the magnetic core set within a reasonable range and increase the number of turns of each winding of the common mode inductor 2 as much as possible, the number of turns of each winding of the common mode inductor 2 is selected to be two. In this embodiment, ten first terminals are respectively fixed at edge portions of a group of opposite sides of the horizontal winding printed board 22 along the window direction of the magnetic ring, the vertical winding copper bar 23 at each edge portion includes five interface winding copper bars 231 and five connection winding copper bars 232 which are arranged at intervals, and the horizontal winding and the vertical winding are connected end to form five windings of the common mode inductor 2.
As shown in fig. 4, in order to reduce the influence of the equivalent series inductance of the capacitor on the high-frequency performance of the capacitor bank while ensuring the capacity and voltage resistance of the capacitor bank, the present embodiment adopts a mode of connecting a plurality of thin film capacitors and a plurality of ceramic capacitors in parallel to realize each capacitor bank, and simultaneously connects a discharge resistor in parallel beside each group of parallel capacitors to prevent the human body from electric shock hazard. The dc output capacitor bank 31 includes two groups of X capacitors 311, one group of Y capacitors 313, and three bleed-off resistors 312; wherein, each group of X capacitors 311 is formed by connecting two film capacitors with 4.7nF and four ceramic chip capacitors with 4.7nF in parallel, one group of Y capacitors 313 is formed by connecting two film capacitors with 10nF and three ceramic chip capacitors with 4.7nF in parallel, and the bleeder resistor 312 is a 5W carbon film resistor with 1M omega. The direct current input capacitor 32 is formed by connecting two film capacitors of 0.33 muF in parallel; the alternating current output capacitor group 33 comprises three groups of X capacitors 331, a group of Y capacitors 333 and four bleeder resistors 332, wherein each group of X capacitors 331 is formed by connecting two 4.7nF thin film capacitors and four 4.7nF ceramic patch capacitors in parallel, each group of Y capacitors 333 is formed by connecting two 10nF thin film capacitors and three 4.7nF ceramic patch capacitors in parallel, and the bleeder resistors 332 are 5W carbon film resistors of 1M omega.
First dielectric slab 4 and second dielectric slab 5 are formed by the nylon materials preparation to cut out the recess in interface winding copper bar 231 department of common mode inductance 2 both sides, carry out the isolation support effect for common mode inductance 2 and electric capacity PCB board 3.
The assembly mode of each internal element of the invention is shown in fig. 1, five second terminals 35 are respectively fixed at the edge parts of a group of opposite sides of the capacitor PCB 3 along the direction of the magnetic ring window of the nanocrystalline magnetic ring group 21, the capacitor PCB 3 is arranged right above the common mode inductor 2 and is connected and fixed with ten vertical interface winding copper bars 231 of the common mode inductor 2 through the ten second terminals 35; the capacitor PCB 3 is fixed above the common-mode inductor 2 through a first dielectric plate 4; the common mode inductor 2 is fixed at the bottom of the metal shell 1 through a second dielectric plate 5.
The connection structure of the invention and an external electric drive system is shown in figure 5, and a common mode inductor 2 and a capacitor PCB 3 in the invention are directly connected with a direct current power supply, an inverter and a three-phase motor of the electric drive system; the metal shell 1 is connected with the shell of the electric drive system in common; the first dielectric sheet 4 and the second dielectric sheet 5 are not connected to an external system. Two windings of the common mode inductor 2 are connected in series in a single-phase direct current positive and negative bus of the electric drive system through an interface winding copper bar 231 and used for reducing the common mode current on a single-phase direct current cable in the motor drive system; the other three windings are connected in series in the three-phase alternating current phase line of the electric drive system through the interface winding copper bar 231 and used for reducing the common-mode current on the three-phase alternating current cable in the motor drive system; the dc output capacitor group 31 on the capacitor PCB 3 is used for bypassing the common mode current flowing to the dc power supply, wherein one end of two groups of X capacitors 311 and two bleed-off resistors 312 are respectively connected to the positive and negative bus bars of the dc power supply, and the other end is connected together in parallel; a group of Y capacitors 313 and a bleeder resistor 312 are connected in parallel across the X capacitor 311 and the joint between the stainless steel metal shell 1 through the grounding copper bar 34; the direct current input capacitor 32 is connected across a positive bus and a negative bus of an inverter of the motor driving system and is used for absorbing voltage overshoot caused by leakage inductance of the common mode inductor 2; the ac output capacitor bank 33 is used to bypass the common mode current flowing to the three-phase motor, wherein one end of each of the three X capacitors 331 and the three bleed-off resistors 332 is connected to the three-phase line of the motor, and the other end is connected in parallel; a group of Y capacitors 333 and a drain resistor 332 are connected in parallel across the X capacitor 331 and the junction with the stainless steel metal case 1 via the ground copper bar 34.
The working principle of the invention is as follows:
the present invention provides a miniaturized EMI filter capable of effectively suppressing common mode noise in an electric drive system. By utilizing the principle that the common-mode noise paths of a single-phase direct-current bus and a three-phase alternating-current phase line in an electric driving system are consistent, two common-mode inductors in the prior art are integrated into one magnetic element in a magnetic integration mode, the number of elements in an EMI filter is reduced, the miniaturization of the EMI filter is realized, and the total common-mode current of the common-mode noise paths of the electric driving system is effectively reduced; meanwhile, the direct current output capacitor bank 31 and the alternating current output capacitor bank 33 at the output end of the EMI filter can form a low-impedance path of common-mode current, so that common-mode noise generated by the inverter is limited in a small loop, and the damage of the common-mode noise to a direct current power supply and a three-phase motor is prevented; the EMI filter can effectively inhibit common-mode noise in the frequency range of 9 kHz-30 MHz in an electric drive system, and meanwhile, a common-mode inductance winding formed by a PCB process and a cut copper bar can meet the conductor current-carrying capacity requirement under the electric drive system with common power level; the input and output terminals are respectively positioned on two sides of the EMI filter, and the installation and wiring are convenient.
The above description is only an example of the present invention and does not constitute any limitation to the present invention, and it is obvious to those skilled in the art that various modifications and changes in form and detail may be made without departing from the principle and structure of the present invention after understanding the present invention, but those modifications and changes based on the idea of the present invention are still within the scope of the claims of the present invention.
Claims (4)
1. An AC-DC coupling integrated EMI filter for a motor driving system is characterized by comprising a metal shell (1), and a common mode inductor (2) and a capacitor PCB (3) which are positioned inside the metal shell (1); the capacitor PCB (3) is fixed above the common-mode inductor (2) through a first dielectric plate (4); the common mode inductor (2) is fixed at the bottom of the metal shell (1) through a second dielectric plate (5), wherein:
the common mode inductor (2) comprises a magnetic core group and five windings; the magnetic core group comprises two layers of nanocrystalline magnetic ring groups (21) which are mutually stacked, and each layer of nanocrystalline magnetic ring group (21) is composed of at least two nanocrystalline magnetic rings which are arranged in parallel; the five windings comprise horizontal winding printing plates (22) which penetrate through magnetic ring windows of each layer of nanocrystalline magnetic ring group (21), a plurality of first terminals are fixed on the edge parts of a group of opposite sides of the horizontal winding printing plates (22) along the direction of the magnetic ring windows respectively, a vertical winding copper bar (23) is fixed on each first terminal, and the vertical winding copper bar (23) on each edge part comprises five interface winding copper bars (231) and at least five connecting winding copper bars (232); each pair of interface winding copper bars (231) on the left side and the right side of the common-mode inductor (2) is connected with the adjacent connecting winding copper bars (232) and the multilayer copper circuits on the horizontal winding printed board (22) end to respectively form five windings of the common-mode inductor (2); the two windings are connected in series in a single-phase direct-current positive and negative bus connected with the inverter and the direct-current power supply through an interface winding copper bar (231) and used for reducing common-mode current on a single-phase direct-current cable in a motor driving system; the other three windings are connected in series in a three-phase alternating current phase line connected with the inverter and the three-phase motor through an interface winding copper bar (231) and used for reducing common-mode current on a three-phase alternating current cable in a motor driving system; the common mode inductor (2) is surrounded on the same magnetic core group through two windings connected in series in a single-phase positive and negative bus and three windings connected in series in a three-phase alternating-current phase line, so that the coupling of alternating-current and direct-current inductors is realized;
the capacitor PCB (3) comprises a direct current output capacitor bank (31), a direct current input capacitor (32) and an alternating current output capacitor bank (33); the direct current output capacitor bank (31) is bridged between a positive bus and a negative bus of a direct current power supply of the motor driving system and the metal shell (1) and is used for bypassing the common mode current flowing to the direct current power supply; the direct current input capacitor (32) is connected between a positive bus and a negative bus of an inverter of the motor driving system in a bridging mode and is used for absorbing voltage overshoot caused by leakage inductance of the common mode inductor (2); the alternating current output capacitor bank (33) is bridged between three phase lines of a three-phase motor of the motor driving system and the metal shell (1) and is used for bypassing the common mode current flowing to the three-phase motor.
2. The EMI filter as set forth in claim 1, wherein the horizontal winding printed circuit board (22) is formed by a multilayer PCB process in which copper lines are stacked to form the horizontal winding of the common mode inductor (2).
3. The integrated EMI filter for motor drive system according to claim 1, wherein the dc output capacitor bank (31) and the ac output capacitor bank (33) are respectively configured as follows:
the direct current output capacitor bank (31) comprises two groups of X capacitors (311), one group of Y capacitors (313) and three bleeder resistors (312); one ends of two groups of X capacitors (311) and two bleeder resistors (312) are respectively connected to a positive bus and a negative bus of the direct-current power supply, and the other ends are connected together in parallel; a group of Y capacitors (313) and a bleeder resistor (312) are connected in parallel and bridged between the parallel connection point of the X capacitor (311) and the metal shell (1);
the alternating current output capacitor bank (33) comprises three groups of X capacitors (331), one group of Y capacitors (333) and four bleeder resistors (332); one ends of the three groups of X capacitors (331) and the three discharge resistors (332) are respectively connected to a three-phase line of the motor, and the other ends of the three groups of X capacitors and the three discharge resistors are connected together in parallel; a group of Y capacitors (333) and a bleeder resistor (332) are connected in parallel across the parallel connection point of the X capacitor (331) and the metal shell (1).
4. The integrated EMI filter for an electrical motor driving system according to claim 1, wherein the capacitor PCB board (3) is fixed with five second terminals (35) at edge portions of a set of opposite sides along a magnetic ring window direction of the nano crystal magnetic ring set (21), and the capacitor PCB board (3) is disposed right above the common mode inductor (2) and is connected and fixed with ten vertical interface winding copper bars (231) of the common mode inductor (2) through the ten second terminals (35).
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| CN112332653B (en) * | 2020-10-28 | 2021-09-28 | 西安电子科技大学 | 3D integrated EMI filter based on multistage CL circuit |
| CN112564476A (en) * | 2020-12-01 | 2021-03-26 | 复旦大学 | Three-phase silicon carbide power semiconductor module integrating current sampling and EMI filtering |
| CN112865509B (en) * | 2021-01-15 | 2023-06-30 | 西安智源导通电子科技有限公司 | Intelligent general common mode EMI filter |
| CN113380492B (en) * | 2021-06-11 | 2023-02-10 | 西安电子科技大学 | AC-DC coupling type common mode inductor for DC inversion power supply system |
| CN117980769A (en) * | 2022-08-05 | 2024-05-03 | 宁德时代(上海)智能科技有限公司 | Filtering component, inverter, motor driving system and vehicle |
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