CN114499156A - Integrated electromagnetic interference filter - Google Patents
Integrated electromagnetic interference filter Download PDFInfo
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- CN114499156A CN114499156A CN202210119212.6A CN202210119212A CN114499156A CN 114499156 A CN114499156 A CN 114499156A CN 202210119212 A CN202210119212 A CN 202210119212A CN 114499156 A CN114499156 A CN 114499156A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
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Abstract
The invention provides an integrated electromagnetic interference filter, which relates to the technical field of electronic appliances and comprises the following components: one end of the base component is an input end, and the other end of the base component is an output end; the first-stage magnetic ring and the second-stage magnetic ring are respectively arranged in the base assembly; the positive and negative copper bars are arranged in parallel, vertically stacked in the base assembly from the input end, sequentially penetrate through the middle positions of the first-stage magnetic ring and the second-stage magnetic ring from the input end and extend to the output end; the copper bar plastic-coated support is sleeved outside the positive and negative copper bars and is positioned between the positive and negative copper bars and the first-stage magnetic ring and the second-stage magnetic ring; and the filter plate assembly is arranged on the base assembly and is electrically connected with the positive and negative electrode copper bars through power taking screws. The invention can reduce stray inductance, reduce interference, improve filtering efficiency, adapt to various spatial structures and facilitate installation and disassembly.
Description
Technical Field
The invention belongs to the technical field of electronic appliances, and particularly relates to an integrated electromagnetic interference filter.
Background
With the development of carbon neutralization and environmental protection emission modes, the market share of new energy electric vehicles in the trip field is gradually increased, and the motor controller mainly plays a role in modulating and controlling the motor in the electric vehicle and is a vital component. The motor controller mainly depends on a power semiconductor device to control the output voltage of the motor, the electric automobile puts new requirements on high voltage, high frequency, high power, high temperature, radiation resistance and the like on a power semiconductor material, a wide-band-gap third-generation semiconductor material (such as silicon carbide SiC and gallium nitride GaN) has excellent switching performance, the temperature stability is widely used in the future, and the power semiconductor device is being converted from an IGBT (insulated gate bipolar transistor) to a wide-band-gap third-generation semiconductor such as SiC and GaN.
Wide bandgap third generation power semiconductor devices have higher switching frequencies and therefore higher current change rates di/dt and voltage change rates du/dt, which may generate electromagnetic interference (EMI) noise, further resulting in the motor controller not operating properly or other product devices not operating properly, for example: high voltage of a motor controller, communication failure of the whole vehicle and the like.
In order to weaken the influence of electromagnetic interference (EMI) caused by the on-off of a power semiconductor device switch of a motor controller, the existing solution mainly depends on shielding, filtering and grounding, and in the aspect of power supply EMI filtering, a passive filter is higher in voltage withstanding value than an active filter and relatively low in price, so that the passive filter is widely used for power supply filtering of electric automobiles. The filter design of a high-voltage power supply in the prior filtering technology lacks the experience of low inductance, low impedance, more material saving and easy test, installation and debugging of a quarter turn structure.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides an integrated emi filter, including:
one end of the base component is an input end, and the other end of the base component is an output end;
the first-stage magnetic ring and the second-stage magnetic ring are respectively arranged in the base assembly;
the positive copper bar and the negative copper bar are arranged in parallel, are vertically stacked from the input end and are arranged in the base assembly, and sequentially penetrate through the middle positions of the first-stage magnetic ring and the second-stage magnetic ring from the input end and extend to the output end;
the copper bar plastic-coated support is sleeved on the outer sides of the positive copper bar and the negative copper bar and is positioned between the positive copper bar and the negative copper bar and the first-stage magnetic ring and the second-stage magnetic ring;
and the filter plate assembly is installed on the base assembly and is electrically connected with the positive copper bar and the negative copper bar through power taking screws.
In one embodiment of the invention, the base assembly is provided with a first magnetic ring installation groove and a second magnetic ring installation groove, the first stage magnetic ring is installed in the first magnetic ring installation groove, and the second stage magnetic ring is installed in the second magnetic ring installation groove.
In an embodiment of the invention, both sides of the first magnetic ring installation groove and the second magnetic ring installation groove are respectively provided with a buckle structure, and the buckle structure is hooked on the tops of the first-stage magnetic ring and the second-stage magnetic ring so as to fix the first-stage magnetic ring and the second-stage magnetic ring in the first magnetic ring installation groove and the second magnetic ring installation groove.
In an embodiment of the invention, the first-stage magnetic ring comprises a first-stage magnetic ring lower lobe and a first-stage magnetic ring upper lobe, the first-stage magnetic ring lower lobe and the first-stage magnetic ring upper lobe are fixedly connected together through a magnetic conductive adhesive, and the positive copper bar and the negative copper bar are wrapped in the middle.
In an embodiment of the invention, the second-stage magnetic ring comprises a second-stage magnetic ring lower lobe and a second-stage magnetic ring upper lobe, the second-stage magnetic ring lower lobe and the second-stage magnetic ring upper lobe are fixedly connected together through a magnetic conductive adhesive, and the positive copper bar and the negative copper bar are wrapped in the middle.
In an embodiment of the invention, the positive electrode copper bar and the negative electrode copper bar are in a straight line shape or a bending part is arranged between the positive electrode copper bar and the negative electrode copper bar.
In an embodiment of the invention, two power taking pins are arranged on the positive copper bar and the negative copper bar at intervals, and the two power taking pins are respectively located at two sides of the first-stage magnetic ring.
In an embodiment of the invention, the power-taking screw penetrates through the filter plate assembly and is connected into the power-taking pin.
In one embodiment of the invention, a two-stage differential mode filter circuit and a two-stage common mode filter circuit are formed on the PCB control board.
In one embodiment of the invention, the PCB control board is provided with a grounding point, and the two-stage common mode filter circuit is connected to the grounding point in common.
The invention provides an integrated electromagnetic interference filter which can reduce stray inductance, enables magnetic fields to be mutually offset through the structural form of parallel laminated copper bars, reduces the stray inductance, enables PN input to be laminated to the maximum extent through the design structure of vertical copper bars, further reduces the stray inductance, reduces interference and improves filtering efficiency.
The invention provides an integrated electromagnetic interference filter, which can realize low grounding impedance, and reduce the length of a common-mode grounding circuit to the greatest extent by a multi-point parallel grounding mode, thereby reducing the grounding impedance and improving the filtering efficiency.
The invention provides an integrated electromagnetic interference filter, which has a parallel laminated vertical structure, saves copper bar materials, reduces the cost, and has high flexibility, wherein the positive electrode copper bar and the negative electrode copper bar are in a linear shape or a bending part is arranged between the positive electrode copper bar and the negative electrode copper bar, so that the structure can be adapted to various space structures from an acute angle to a flat angle.
The invention provides an integrated electromagnetic interference filter, which is characterized in that on the basis of a parallel laminated vertical structure of a copper bar, a power taking pin is arranged on the copper bar and is connected with the power taking pin by adopting a screw so as to realize locking and paying power taking of a filter plate assembly, so that the integrated electromagnetic interference filter is convenient to mount and dismount, the assembly and disassembly process is simplified, and the labor cost and the process cost are saved.
The invention provides an integrated electromagnetic interference filter.A common-mode patch capacitor Y9-Y16 and a differential-mode patch capacitor X5-X8 are reserved on a filter plate component, and whether the filter capacitor is used or not can be selected according to different excitations so as to realize flexible allocation of electrical appliance parameters.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an integrated emi filter according to an embodiment of the invention.
FIG. 2 is an exploded view of an integrated EMI filter according to an embodiment of the present invention.
Fig. 3 is a schematic view illustrating an assembly of a base assembly and a copper bar in an integrated emi filter according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a copper bar in an integrated emi filter according to an embodiment of the invention.
FIG. 5 is a circuit topology diagram of an integrated EMI filter according to one embodiment of the present invention.
FIG. 6 is an equivalent circuit diagram of differential mode filtering in the integrated EMI filter according to an embodiment of the present invention.
FIG. 7 is an equivalent circuit diagram of common mode filtering in an integrated EMI filter according to an embodiment of the present invention.
Description of reference numerals:
an electromagnetic interference filter 100; a base assembly 10; an input terminal 11; an output end 12; a first magnetic ring mounting groove 101; a second magnetic ring mounting groove 102; a snap structure 103; a connecting column 104; a positive copper bar 21; a negative copper bar 22; a copper bar plastic-coated bracket 23; a power take-off pin 24; a first-stage magnetic ring 31; a first-stage magnetic ring lower lobe 311; a first stage magnetic ring upper lobe 312; a second stage magnetic ring 32; a second stage magnetic ring lower lobe 321; a second stage magnetic ring upper lobe 322; a filter plate assembly 40; a ground point 401.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention provides an integrated electromagnetic interference filter, which aims to solve the problems of stray inductance, material cost, installation process and the like in the prior art, and specifically, as shown in fig. 1 to 4, in the embodiment, the electromagnetic interference filter 100 comprises a base component 10, an anode copper bar 21, a cathode copper bar 22, a copper bar plastic-coated support 23, a first-stage magnetic ring 31, a second-stage magnetic ring 32 and a filter plate component 40, wherein the anode copper bar 21 and the cathode copper bar 22 are installed in the base component 10, the copper bar plastic-coated support 23 is wrapped on the outer sides of the anode copper bar 21 and the cathode copper bar 22, the first-stage magnetic ring 31 and the second-stage magnetic ring 32 are sleeved on the outer side of the copper bar plastic-coated support 23, namely the copper bar plastic-coated support 23 is positioned between the anode copper bar 21 and the cathode copper bar 22 and the first-stage magnetic ring 31 and the second-stage magnetic ring 32, the filter plate assembly 40 is mounted on the base assembly 10 and fixedly connected with the base assembly 10 through a fixing bolt.
As shown in fig. 1 to 4, in this embodiment, the base assembly 10 includes an input end 11 and an output end 12, and a first magnetic ring mounting groove 101 and a second magnetic ring mounting groove 102 are disposed in the base assembly 10, the first magnetic ring 31 is mounted in the first magnetic ring mounting groove 101, the second magnetic ring 32 is mounted in the second magnetic ring mounting groove 102, and the positive copper bar 21 and the negative copper bar 22 are disposed in parallel in the base assembly 10, and the positive copper bar 21 and the negative copper bar 22 are mounted in the base assembly 10 in a vertically stacked manner from the input end 11, and the positive copper bar 21 and the negative copper bar 22 sequentially pass through the middle positions of the first magnetic ring 31 and the second magnetic ring 32 from the input end 11 and extend to the output end 102, so that the apparatus increases the stacked length of the copper bars on the unfiltered side to the maximum extent through the structural design, the input end 11 begins to be vertical stromatolite and arranges promptly, just designs parallel stromatolite scheme when the copper bar just input, through the structural style of parallel stromatolite copper bar, lets offsetting each other of magnetic field, reduces stray inductance, and the maximum stromatolite when letting the copper bar input through the project organization of vertical copper bar further reduces stray inductance, reduces the interference to promote filtering efficiency. It should be noted that, in this embodiment, the entire differential mode, common mode, and magnetic loop filtering path in the electromagnetic interference filter may adopt a scheme of parallel stacking to the greatest extent.
As shown in fig. 1 to 4, in this embodiment, the positive copper bar 21 and the negative copper bar 22 are in a straight line shape or have a bending portion between them to adapt to the base assemblies 10 in different shapes, that is, the structure can adapt to various spatial structures, which reduces material waste during blanking, that is, the copper bar structure is placed horizontally relative to the parallel stacked layers, the positive copper bar 21 and the negative copper bar 22 are vertically placed through the parallel stacked layers to save copper bar material, and in addition, the positive copper bar 21 and the negative copper bar 22 are, for example, set in a straight line shape or have a bending portion between them to adapt to various spatial structures from an acute angle to a flat angle by adjusting the bending angle of the copper bar.
As shown in fig. 1 to 4, in this embodiment, two sides of the first magnetic ring installation groove 101 and the second magnetic ring installation groove 102 are respectively provided with a fastening structure 103, and the fastening structure 103 is hooked on the top of the first-stage magnetic ring 31 and the second-stage magnetic ring 32, so as to fix the first-stage magnetic ring 31 and the second-stage magnetic ring 32 in the first magnetic ring installation groove 102 and the second magnetic ring installation groove 102. It should be noted that at least one fastening structure 103 is respectively disposed on two opposite sides of the first magnetic ring mounting groove 101 and the second magnetic ring mounting groove 102, and if only one fastening structure 103 is disposed on each of the two sides, the fastening structure 103 is disposed in the middle of each side, so as to ensure the reliability of fixing the first-stage magnetic ring 31 and the second-stage magnetic ring 32.
As shown in fig. 1 to 4, in this embodiment, the first-stage magnetic ring 31 includes a first-stage magnetic ring lower lobe 311 and a first-stage magnetic ring upper lobe 312, the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are fixedly connected together through a magnetic conductive adhesive, and the positive copper bar 21 and the negative copper bar 22 are wrapped in the middle, specifically, the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are respectively configured as a "concave" structure, that is, when the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are fixedly connected together through a magnetic conductive adhesive, a through hole is formed in a middle portion of the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 due to the "concave" structure thereof, so that the positive copper bar 21 and the negative copper bar 22 pass through the first-stage magnetic ring 31.
As shown in fig. 1 to 4, in this embodiment, the first-stage magnetic ring 31 includes a first-stage magnetic ring lower lobe 311 and a first-stage magnetic ring upper lobe 312, the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are fixedly connected together through a magnetic conductive adhesive, and the positive copper bar 21 and the negative copper bar 22 are wrapped in the middle, specifically, the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are respectively configured as a "concave" structure, that is, when the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 are fixedly connected together through a magnetic conductive adhesive, a through hole is formed in a middle portion of the first-stage magnetic ring lower lobe 311 and the first-stage magnetic ring upper lobe 312 due to the "concave" structure thereof, so that the positive copper bar 21 and the negative copper bar 22 pass through the first-stage magnetic ring 31.
As shown in fig. 1 to 4, in this embodiment, the second-stage magnetic ring 32 includes a second-stage magnetic ring lower lobe 321 and a second-stage magnetic ring upper lobe 322, the second-stage magnetic ring lower lobe 321 and the second-stage magnetic ring upper lobe 322 are fixedly connected together through a magnetic conductive adhesive, and the positive copper bar 21 and the negative copper bar 22 are wrapped therebetween, specifically, the second-stage magnetic ring lower lobe 321 and the second-stage magnetic ring upper lobe 322 are respectively configured as a "concave" structure, that is, when the second-stage magnetic ring lower lobe 321 and the second-stage magnetic ring upper lobe 322 are fixedly connected together through the magnetic conductive adhesive, a through hole is formed in a middle portion thereof due to the "concave" structure, so that the positive copper bar 21 and the negative copper bar 22 pass through the second-stage magnetic ring 32.
As shown in fig. 1 to 4, the positive copper bar 21 and the negative copper bar 22 sequentially pass through the middle positions of the first-stage magnetic ring 31 and the second-stage magnetic ring 32 from the input end 11 and extend to the output end 12, that is, the first-stage magnetic ring 31 is close to the input end 11, and the second-stage magnetic ring 32 is close to the output end 12.
As shown in fig. 1 to 4, during installation, the base assembly 10 is first fixed and horizontally placed, the first-stage magnetic ring lower lobe 311 and the second-stage magnetic ring lower lobe 321 are respectively installed in the first magnetic ring installation slot 101 and the second magnetic ring installation slot 102 with their grooves facing upward, the positive copper bar 21 and the negative copper bar 22 wrapped with the copper bar plastic-wrapped bracket 23 are installed on the base assembly 10 as a whole and penetrate through the grooves of the first-stage magnetic ring lower lobe 311 and the second-stage magnetic ring lower lobe 321, the first-stage magnetic ring upper lobe 312 and the second-stage magnetic ring upper lobe 322 coated with magnetic conductive adhesive are then pressed on the first-stage magnetic ring lower lobe 311 and the second-stage magnetic ring lower lobe 321, and then a fixing material is poured into the first-stage magnetic ring installation slot 101 and the second-stage magnetic ring installation slot 102 to further fix the first-stage magnetic ring 31 and the second-stage magnetic ring 32, the fixing material is, for example, epoxy resin, so as to further fix the first-stage magnetic ring 31 and the second-stage magnetic ring 32, and improve the stability thereof.
As shown in fig. 1 to 4, in this embodiment, a plurality of limiting grooves are further disposed inside the base assembly 10, so as to limit the positive electrode copper bar 21 and the negative electrode copper bar 22, and thus the base assembly 10 is installed therein.
As shown in fig. 1 to 4, in this embodiment, the filter plate assembly 40 is installed on the base assembly 10, during installation, the filter plate assembly 40 is positioned by a positioning pin and is fixedly installed with the base assembly 10 by a fixing bolt, and the filter plate assembly 40 is electrically connected with the positive copper bar 21 and the negative copper bar 22 by a power-taking screw.
As shown in fig. 1 to 4, in this embodiment, two power taking pins 24 are disposed on the positive copper bar 21 and the negative copper bar 22 at intervals, and the two power taking pins 24 are respectively located at two sides of the first-stage magnetic ring 31, and when the PCB control board is installed, the power taking screws penetrate through the filter board assembly 40 and are connected to the power taking pins 24, so that the PCB control board is electrically connected to the positive copper bar 21 and the negative copper bar 22. In this embodiment, be provided with a plurality of spliced poles 104 in the base subassembly 10, be provided with the screw hole on this screw thread post 104, and positive copper bar 21 with negative pole copper bar 22 extends to the outside has the pin 24, just be provided with the through-hole on the pin 24, during the installation, through-hole on the pin 24 with screw hole one-to-one on the spliced pole 104, rethread screw passes through-hole on PCB control panel and the pin 24 with threaded connection between the screw hole on the spliced pole 104 to the lock of the PCB control panel in the realization filter plate subassembly 40 pays and gets the electricity, erects on putting the structure basis at the parallel stromatolite of copper bar promptly, adopts the lock of screw and PCB control panel to pay the electricity, and the device's of being convenient for installation and disassembling have simplified the assembly and disassembly technology, have saved cost of labor, technology cost.
As shown in fig. 5 to 7, in this embodiment, a differential mode filter circuit and a common mode filter circuit are formed on the PCB control board, and the differential mode filter circuit includes differential mode capacitors X1-X4, a first-stage magnetic ring 31 and a second-stage magnetic ring 32, where the differential mode capacitors X1-X4 are differential mode plug-in capacitors; the common mode filter circuit comprises common mode capacitors Y1-Y8, resistors R1-R4, a first-stage magnetic ring and a second-stage magnetic ring, wherein the common mode capacitors Y1-Y8 are common mode plug-in capacitors.
As shown in fig. 5 and fig. 6, in this embodiment, the differential mode filter circuit includes a first stage differential mode filter circuit and a second stage differential mode filter circuit, where the first stage differential mode filter circuit includes differential mode capacitors X1-X2 and a first stage magnetic ring 31, the second stage differential mode filter circuit includes differential mode capacitors X3-X4 and a second stage magnetic ring 32, in some embodiments, the PCB control board is further preset with differential mode capacitors X5-X8, the differential mode capacitors X5-X8 are differential mode patch capacitors, the first stage differential mode filter circuit further includes differential mode capacitors X5-X6, the second stage differential mode filter circuit further includes differential mode capacitors X7-X8, that is, the first stage differential mode filter circuit includes differential mode capacitors X1-X2 which are differential mode patch capacitors, differential mode capacitors X5-X6 which are differential mode patch capacitors, and a first stage magnetic ring 31, and the second stage differential mode filter circuit includes differential mode plug-in which the differential mode capacitors X8635-X3 are differential mode plug-X4, The differential mode capacitor X7-X8 and the second-stage magnetic ring 32 are the differential mode patch capacitors, so that the device can select whether to use the filter capacitors of the differential mode capacitors X7-X8 of the differential mode patch capacitors according to different excitations, and the device can flexibly adjust the parameters of the electric appliance. It should be noted that, because the positive and negative poles of the differential mode filter circuit utilize two different parts of the first-stage magnetic ring 31 or the second-stage magnetic ring 32, in the equivalent circuit diagram of the differential mode filter circuit, the differential mode inductors L1 to L2 thereon are equivalent to the inductors of the two different parts of the first-stage magnetic ring 31, the differential mode inductors L3 to L4 are equivalent to the inductors of the two different parts of the second-stage magnetic ring 32, and the equivalent circuit diagram of the first-stage differential mode filter circuit and the second-stage differential mode filter circuit is shown in fig. 6.
As shown in fig. 5 and 6, the first stage differential mode filter circuit functions as a noise source for external differential mode power noise passing through the differential mode capacitors X1-X2 and the preset differential mode capacitors X5-X6, wherein the differential mode inductors L1-L2 existing in the first stage magnetic ring 31 are in high impedance to reduce interference to internal circuits, and the external power supply further reduces internal interference due to the existence of the first stage differential mode filter.
As shown in fig. 5 and 6, the second stage differential mode filtering functions to reduce the power noise partially passing through the first stage differential mode filtering, and the differential mode inductors L3 to L4 existing in the second stage magnetic ring 32 are in high impedance through the differential mode capacitors X3 to X4 and the preset differential mode capacitors X7 to X8, so as to further reduce the interference of the external power supply to the internal circuit.
As shown in fig. 5 and 6, in this embodiment, X1 to X4 are plug capacitors, pins are inserted into the PCB control board and soldered to get power, the reserved X5 to X8 are patch capacitors, the capacitor patches are soldered by a mounter and then power is taken through the internal circuit of the PCB control board, and the PCB control board is locked and paid for power through the power taking pins 24 extending from the copper bars and the screws.
As shown in fig. 5 and 7, in this embodiment, the common mode filter circuit includes a first stage common mode filter circuit and a second stage common mode filter circuit, where the first stage common mode filter circuit includes common mode capacitors Y1-Y4, resistors R1-R2 and a first stage magnetic ring 31, and the second stage common mode filter circuit includes common mode capacitors Y5-Y8, resistors R3-R4 and a second stage magnetic ring 32. In some embodiments, common mode capacitors Y9 to Y16 are further preset on the PCB control board, the common mode capacitors Y9 to Y16 are common mode patch capacitors, the first stage common mode filter circuit further includes common mode capacitors Y9 to Y12, the second stage common mode filter circuit further includes common mode capacitors Y13 to Y16, that is, the first stage common mode filter circuit includes resistors R1 to R2, common mode capacitors Y1 to Y4 which are common mode plug-in capacitors, common mode capacitors Y9 to Y12 which are preset common mode patch capacitors, and the first stage magnetic ring 31, and the second stage common mode filter circuit includes resistors R3 to R4, common mode capacitors Y5 to Y8 which are common mode plug-in capacitors, common mode capacitors Y13 to Y16 which are preset common mode patch capacitors, and the second stage magnetic ring 32. The device can select whether to use the filter capacitor of the common-mode capacitor Y9-Y16 of the common-mode patch capacitor according to different excitations, thereby enabling the device to flexibly adjust the parameters of the electric appliance. In the common mode filter circuit, the first-stage magnetic ring 31 or the second-stage magnetic ring 32 is respectively connected to the common mode filter circuit as a whole, so in an equivalent circuit diagram of the common mode filter circuit, the common mode inductor L5 thereon is equivalent to the inductor of the first-stage magnetic ring 31, the common mode inductor L6 is equivalent to the inductor of the second-stage magnetic ring 32, and the equivalent circuit diagrams of the first-stage common mode filter circuit and the second-stage common mode filter circuit are shown in fig. 7.
As shown in fig. 5 and 7, the first-stage common mode filter functions in that external common mode power noise is connected to the ground plane through resistors R1 and R2, common mode capacitors Y1 to Y4, and preset common mode capacitors Y9 to Y12 by a bypass, and a common mode inductor L5 existing in the first-stage magnetic ring 31 presents a balanced impedance, presents a high resistance to the common mode noise, and reduces interference to an internal circuit.
As shown in fig. 5 and 7, the second-stage common mode filter functions to partially pass the common mode noise of the first-stage common mode filter, and is connected to the ground plane through the resistors R3 and R4, the common mode capacitors Y5 to Y8, and the reserved common mode capacitors Y13 to Y16 by a bypass, and the common mode inductor L6 existing in the second-stage magnetic ring 32 presents a balanced impedance, presents a high resistance to the common mode noise, and further weakens the interference to the internal circuit.
As shown in fig. 5 and 7, in this embodiment, R1 to R4 are resistors, Y1 to Y8 are plug-in capacitors, pins are inserted into a PCB and soldered to obtain power from one pin, another pin guides stray current to the ground, reserved Y9 to Y16 are patch capacitors, the capacitors are soldered to the ground by a chip mounter and then obtain power from an internal circuit of a PCB control board and guide the stray current to the ground, and the PCB control board is locked and paid to obtain power between a power-taking pin 24 extending out of a copper bar and a screw.
As shown in fig. 1 to 7, in the present embodiment, the filter board assembly 40 is provided with a grounding point 401, and the first common mode filter circuit and the second common mode filter circuit in the PCB control board of the filter board assembly 40 are connected in parallel and connected to the grounding point 401 for grounding, so that the common mode grounding line length of the device is minimized, the grounding impedance is reduced, and the filtering performance is improved.
The invention provides an integrated electromagnetic interference filter which can reduce stray inductance, enables magnetic fields to be mutually offset through the structural form of parallel laminated copper bars, reduces the stray inductance, enables PN input to be laminated to the maximum extent through the design structure of vertical copper bars, further reduces the stray inductance, reduces interference and improves filtering efficiency.
The invention provides an integrated electromagnetic interference filter, which can realize low grounding impedance, and reduce the length of a common-mode grounding circuit to the greatest extent by a multi-point parallel grounding mode, thereby reducing the grounding impedance and improving the filtering efficiency.
The invention provides an integrated electromagnetic interference filter, which has a parallel laminated vertical structure, saves copper bar materials, reduces the cost, and has high flexibility, wherein the positive electrode copper bar and the negative electrode copper bar are in a linear shape or a bending part is arranged between the positive electrode copper bar and the negative electrode copper bar, so that the structure can be adapted to various space structures from an acute angle to a flat angle.
The invention provides an integrated electromagnetic interference filter, which is characterized in that on the basis of a parallel laminated vertical structure of a copper bar, a power taking pin is arranged on the copper bar and is connected with the power taking pin by adopting a screw so as to realize locking and paying power taking of a filter plate assembly, so that the integrated electromagnetic interference filter is convenient to mount and dismount, the assembly and disassembly process is simplified, and the labor cost and the process cost are saved.
The invention provides an integrated electromagnetic interference filter.A common-mode patch capacitor Y9-Y16 and a differential-mode patch capacitor X5-X8 are reserved on a filter plate component, and whether the filter capacitor is used or not can be selected according to different excitations so as to realize flexible allocation of electrical appliance parameters.
The above description is only a preferred embodiment of the present application and a description of the applied technical principle, and it should be understood by those skilled in the art that the scope of the present application is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above technical features (but not limited to) having similar functions disclosed in the present application.
Other technical features than those described in the specification are known to those skilled in the art, and are not described herein in detail in order to highlight the innovative features of the present invention.
Claims (10)
1. An integrated emi filter comprising:
one end of the base component is an input end, and the other end of the base component is an output end;
the first-stage magnetic ring and the second-stage magnetic ring are respectively arranged in the base assembly;
the positive copper bar and the negative copper bar are arranged in parallel, are vertically stacked from the input end and are arranged in the base assembly, and sequentially penetrate through the middle positions of the first-stage magnetic ring and the second-stage magnetic ring from the input end and extend to the output end;
the copper bar plastic-coated support is sleeved on the outer sides of the positive copper bar and the negative copper bar and is positioned between the positive copper bar and the negative copper bar and the first-stage magnetic ring and the second-stage magnetic ring;
and the filter plate assembly is installed on the base assembly and is electrically connected with the positive copper bar and the negative copper bar through power taking screws.
2. The integrated EMI filter as set forth in claim 1, wherein said base assembly has a first magnetic ring mounting groove and a second magnetic ring mounting groove disposed therein, said first stage magnetic ring being mounted in said first magnetic ring mounting groove, said second stage magnetic ring being mounted in said second magnetic ring mounting groove.
3. The integrated EMI filter as claimed in claim 2, wherein both sides of said first and second magnetic ring mounting grooves are respectively provided with a snap structure, said snap structure barb being on top of said first and second stage magnetic rings to secure said first and second stage magnetic rings within said first and second magnetic ring mounting grooves.
4. The integrated emi filter as claimed in claim 1, wherein the first stage magnetic ring includes a first stage magnetic ring lower lobe and a first stage magnetic ring upper lobe, the first stage magnetic ring lower lobe and the first stage magnetic ring upper lobe are fixedly connected together by a magnetic conductive adhesive, and the positive copper bar and the negative copper bar are wrapped therebetween.
5. The integrated emi filter as claimed in claim 1, wherein the second stage magnetic ring includes a second stage magnetic ring lower lobe and a second stage magnetic ring upper lobe, the second stage magnetic ring lower lobe and the second stage magnetic ring upper lobe are fixedly connected together by a magnetic conductive adhesive, and the positive copper bar and the negative copper bar are wrapped therebetween.
6. The integrated emi filter of claim 1 wherein the positive copper bar and the negative copper bar are straight or have a bend disposed therebetween.
7. The integrated electromagnetic interference filter as claimed in claim 1, wherein two current-taking pins are disposed on the positive copper bar and the negative copper bar at intervals, and the two current-taking pins are respectively disposed on two sides of the first-stage magnetic ring.
8. The integrated emi filter of claim 7 wherein the power screws pass through the filter plate assembly and connect into the power pins.
9. The integrated emi filter of claim 1 wherein the PCB control board has two stages of differential mode filter circuits and two stages of common mode filter circuits formed thereon.
10. The integrated emi filter of claim 1 wherein the PCB control board is provided with a ground point to which the two-stage common mode filter circuit is commonly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119212.6A CN114499156A (en) | 2022-02-08 | 2022-02-08 | Integrated electromagnetic interference filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210119212.6A CN114499156A (en) | 2022-02-08 | 2022-02-08 | Integrated electromagnetic interference filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114499156A true CN114499156A (en) | 2022-05-13 |
Family
ID=81479418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210119212.6A Pending CN114499156A (en) | 2022-02-08 | 2022-02-08 | Integrated electromagnetic interference filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114499156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175915A (en) * | 2023-11-02 | 2023-12-05 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
-
2022
- 2022-02-08 CN CN202210119212.6A patent/CN114499156A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175915A (en) * | 2023-11-02 | 2023-12-05 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
| CN117175915B (en) * | 2023-11-02 | 2024-02-02 | 武汉嘉晨电子技术有限公司 | High-voltage heavy-current filtering component suitable for booster |
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