CN209517856U - A kind of EMI filtering bracing means based on PCB functional circuit - Google Patents
A kind of EMI filtering bracing means based on PCB functional circuit Download PDFInfo
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- CN209517856U CN209517856U CN201822247666.3U CN201822247666U CN209517856U CN 209517856 U CN209517856 U CN 209517856U CN 201822247666 U CN201822247666 U CN 201822247666U CN 209517856 U CN209517856 U CN 209517856U
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Abstract
The utility model provides a kind of EMI filtering bracing means based on PCB functional circuit, including PCB circuit board and functional circuit, cabinet, chassis cover, EMI filtering integration module and metal connector, functional circuit and EMI filtering integration module are separately mounted to the integrated pcb board in top and bottom of PCB circuit board, integrated pcb board is mounted in cabinet, and conductive rubber strip is equipped between cabinet and chassis cover and the two is locked；EMI filters integration module one end and the signal exit of functional circuit connects, and the other end is connect with metal connector, filters integration module and metal connector is multiple and corresponds.The utility model realizes the shielding of each pass outlet of functional module to electrically connected port circuit；The shielding isolation between each connector end mouth line is realized simultaneously, and realizes circuit function module to field-line, the line-line interference and coupling in each interference conductive interference suppression channel.
Description
Technical field
The utility model belongs to technical field of electromagnetic compatibility, and in particular to it is a kind of based on PCB functional circuit EMI filtering plus
It is fixedly mounted with and sets.
Background technique
With the fast development of information electronic circuit Highgrade integration, Switching Power Supply, amplifying circuit of analog signal, power arteries and veins
A large amount of integrated applications of circuit, A/D, D/A conversion circuit, bus communication circuitry and high-speed data processor DSP, FPGA etc. are rushed,
Electronic system shows broader frequency domain characteristic, and the frequency domain weight of wider range often occur in the frequent subsequences of these circuit units
It closes.Even if these circuit units in the same device, also not will appear a large amount of electromagnetic compatibility problem: due to system high-density cloth
There are a large amount of signals and are coupled in work frequency domain from other equipment circuit unit in the factors such as line and line-line interference and coupling
The band interference, cause this equipment work it is disturbed；Or the signal is coupled to other equipment single channel unit；Interference and other equipment
Circuit same frequency, and amplitude is larger, influences the normal work of other equipment.
To this from compatibling problem of system appearance, traditional solution is turned off Conduction Interference path, mainly exists
The lead-out wire port of circuit carries out EMI filtering.This carrying out measures on PCB, then be by common EMI filter inductance, capacitor,
It is mounted on the EMI filter circuit position of pcb board.Although the EMI measure on these pcb boards is closer apart from cabinet electrical connection interface,
But expected electromagnetic compatibility effect, the especially external radiation-emitting project of equipment can not be reached.EMI on this PCB is set
The reason of meter can not achieve the desired results is:
(1) coupling of high frequency useful signal and interference to EMI filter inductance in PCB circuit board, causes filter inductance in height
Frequency filtering failure；
(2) coupling of high frequency useful signal and interference to the electrically connected port connecting wire of PCB and cabinet in PCB circuit board
It closes, EMI filter circuit is caused to be bypassed by High-frequency Interference.
(3) impedance of PCB circuit board leakage path over the ground is big, cause interference with release over the ground it is obstructed.
Utility model content
The purpose of this utility model is the EMI filter design defect being widely present for current PCB circuit board, provides one kind
EMI based on PCB functional circuit filters bracing means, thoroughly solves electronic equipment electromagnetic compatibility problem.
The technical scheme that the utility model is provided is as follows:
A kind of EMI filtering bracing means based on PCB functional circuit, including PCB circuit board and in PCB circuit board
Functional circuit, further includes cabinet, chassis cover, EMI filtering integration module and metal connector, and the functional circuit and EMI are filtered
The top and bottom that wave integration module is separately mounted to PCB circuit board form the integrated pcb board of EMI filtering and functional circuit, institute
The stratum on the stratum and EMI filtering integration module region of stating functional circuit region is not turned on, the EMI filtering and functional circuit
Integrated pcb board is mounted in cabinet, and conductive rubber strip is equipped between the cabinet and chassis cover and the two is locked；
The signal exit of described filtering integration module one end EMI and functional circuit connects, the other end and metal connector
Connection, the filtering integration module and metal connector are multiple and correspond.
The PCB circuit board is reserved with closing conducting surface, the machine in the surrounding of each EMI filtering integration module installation
Multiple independent cavitys are equipped in case, the position of cavity is corresponding with the filtering position of integration module EMI, and each cavity top surface is equipped with
With the conductive faying surface of closing conducting surface face.
The EMI filtering integration module is power-supply filter, number bus traffic filter, digital controlled signal filtering
One of device, analog control signal filter, pulse power/traffic filter, level signal filter circuit or a variety of electricity
Road combination.
Locking flange is also equipped in the PCB circuit board, the locking flange and metal connector pass through conducting wire and EMI
Integration module is filtered to be connected.
The back side continuous conduction of the chassis cover, chassis cover and cabinet, conductive rubber strip are locked by the first screw
Connection.
The closing conducting surface and electrical bonding face are locked by the second screw.
The locking flange is locked by third screw and cabinet.
The beneficial effects of the utility model are:
The utility model realizes each pass of functional module by integrated PCB circuit board and shielding case structure, screw
Outlet to electrically connected port circuit shielding；The shielding isolation between each connector end mouth line is realized simultaneously, and realizes circuit
Field-line, line-line interference and coupling of the functional module to each interference conductive interference suppression channel.
Suitable for the functional design and EMC Design of complex electronic equipment, external electrically connected port can be effectively suppressed
High-frequency conduction interference, the external radiation-emitting of equipment is greatly lowered, improves the anti-interference ability of equipment, makes equipment, system
Preferably meet relevant national standard/army's target EMC Requirements.
It is described in further details below in conjunction with attached drawing.
Detailed description of the invention
Fig. 1 is the circuit theory schematic block diagram of the utility model；
Fig. 2 is the integrated pcb board schematical top view of EMI filtering and functional circuit；
Fig. 3 is the integrated pcb board bottom schematic view of EMI filtering and functional circuit；
Fig. 4 is a kind of embodiment structure schematic diagram of cabinet；
Fig. 5 is a kind of embodiment assembling schematic diagram of the utility model；
Fig. 6 is a kind of embodiment overall structure diagram of the utility model.
In figure: 1, cabinet；2, conductive rubber strip；3, chassis cover；4, PCB circuit board；5, functional module；6, EMI is filtered
Integration module；7, metal connector；8, flange is locked；9, conducting surface is closed；10, conductive faying surface；11, the first screw；12,
Two screws；13, third screw；14, EMI filters integration module A；15, EMI filters integration module B；16, EMI filters integration module
C；17, metal connector A；18, metal connector B；19, metal connector C；20, cavity.
Specific embodiment
Embodiment 1:
Present embodiments provide a kind of EMI filtering bracing means based on PCB functional circuit, including PCB circuit board 4 and dress
Functional circuit in PCB circuit board 4, further includes cabinet 1, chassis cover 3, EMI filtering integration module 6 and metal connector 7,
The top and bottom that the functional circuit and EMI filtering integration module 6 are separately mounted to PCB circuit board 4 form EMI filtering and function electricity
The stratum in the integrated pcb board on road, the stratum in the functional circuit region and EMI filtering 6 region of integration module is not turned on, institute
It states EMI filtering and the integrated pcb board of functional circuit is mounted in cabinet 1, be equipped between the cabinet 1 and chassis cover 3
Conductive rubber strip 2 and the two locking；
The signal exit of described filtering integration module one end EMI and functional circuit connects, the other end and metal connector 7
Connection, the filtering integration module and metal connector 7 are multiple and correspond.
It is this based on PCB functional circuit EMI filtering bracing means be suitable for complex electronic equipment functional design with
EMC Design, can be effectively suppressed external electrically connected port high-frequency conduction interference, be greatly lowered equipment to external radiation
Transmitting, improves the anti-interference ability of equipment, equipment, system is made preferably to meet relevant national standard/army's target EMC Requirements.
Embodiment 2:
On the basis of embodiment 1, a kind of EMI filtering bracing means based on PCB functional circuit is present embodiments provided,
The PCB circuit board 4 is reserved in the surrounding that each EMI filtering integration module 6 is installed and closes conducting surface 9, in the cabinet 1
Equipped with multiple independent cavitys 20, the position of cavity 20 is corresponding with the filtering position of integration module 6 EMI, each 20 top surface of cavity
Equipped with the conductive faying surface 10 with closing 9 face of conducting surface.
The conductive faying surface 10 for closing conducting surface 9 and cabinet 1 is locked, and realize 4 bottom of PCB circuit board covers the good of copper face
Good ground connection makes PCB circuit board 4 realize the Low ESR connection of EMI filter circuit over the ground.
Embodiment 3:
On the basis of embodiment 1, a kind of EMI filtering bracing means based on PCB functional circuit is present embodiments provided,
It is power-supply filter, number bus traffic filter, digital controlled signal filter, simulation control letter that EMI, which filters integration module 6,
One of number filter, pulse power/traffic filter, level signal filter circuit or a variety of electrical combinations.
EMI filters the interference that integration module 6 effectively inhibits functional circuit to generate and conducts along conducting wire to 7 end of metal connector.
Embodiment 4:
A kind of EMI filtering bracing means based on PCB functional circuit is present embodiments provided, as shown in Figure 1, functional module
5 signal is drawn there are three ports, and it is respectively that EMI filtering is integrated that an EMI filtering integration module 6(, which is respectively set, in corresponding position
Modules A 14, EMI filter integration module B15, EMI and filter integration module C16), the interference edge for effectively functional circuit being inhibited to generate is led
Line conducts electric connector end.EMI filters integration module C16 points of filtering of integration module A14, EMI filtering integration module B15, EMI
It Lian Jie not metal connector A17, metal connector B18, metal connector C19.
EMI integrating filtering module can be power-supply filter, number bus traffic filter, digital controlled signal filtering
One of device, analog control signal filter, pulse power/traffic filter, level signal filter circuit or a variety of electricity
Road is combined.In the present embodiment, EMI integrating filtering module is the filter of five signal wires.
Fig. 2, Fig. 3 are the integrated pcb board structural schematic diagram of EMI filtering and functional circuit, the ground in 5 region of functional module
Layer and the stratum of EMI filter field are not turned on；Functional module 5 is by circuit requirement wiring and wiring harness device, in PCB circuit board
4 right side carries out EMI filter circuit wiring, the bottom PCB to cover surrounding of the copper face in each assembly EMI integration module position pre-
Stay a closing conducting surface 9.Locking flange 8 is filtered after integration module 6 is connected by conducting wire with EMI with metal connector 7 and function
Energy module 5 is in PCB circuit board 4.Three electrically connected ports of functional module 5 are by the corresponding EMI integration module in three tunnels, metal
Connector 7 and conducting wire are respectively completed EMI AF panel and signal transmits.
It is illustrated in figure 41 structural schematic diagram of cabinet, the structure of cabinet 1 is five conductive face structures of connection.With chassis cover
3 10 continuous conduction of conductive faying surface, and 2 mounting groove of conductive rubber strip is designed on the conductive faying surface 10 with chassis cover 3.
Cabinet 1 filters 6 Position Design of integration module, three independent cavitys 20 in the EMI of PCB circuit board 4, and in the top surface of cavity wall
The conductive faying surface 10 of design and 4 bottom of PCB circuit board closing, 9 face of conducting surface.
EMI shown in Fig. 2 filtering and the integrated pcb board of functional circuit are packed into cabinet 1.As shown in fig. 6, passing through the
Two screws 12 lock the closing conducting surface 9 of PCB circuit board 4 and the conductive faying surface 10 of cabinet 1, realize covering for the bottom PCB
The good earth of copper face makes PCB circuit board 4 realize the Low ESR connection of EMI filter circuit over the ground.Divided by third screw 13
The siding that the locking flange 8 of pcb board connects conductive faying surface 10 and cabinet 1 is not locked, closing conducting surface 9 is led with cabinet 1
The locking of electrical bonding face 10 constitutes three individual screen cavitys, has both realized that three pass outlets to the electrically connected port of functional module 5 was filtered
The shielding of wave circuit and transmission line；The shielding isolation between three metal connectors, 7 port connecting wire is realized again, is effectively subtracted
Small circuit function module 5 is to the integrated interference and coupling with wiring of EMI filtering in three individual screen cavitys.Fig. 5 is assembly signal
Figure.
The back side continuous conduction of chassis cover 3, chassis cover 3 and cabinet 1, conductive rubber strip 2 are locked by the first screw 11
It is tightly connected, realizes interfering and the electromagnetic shielding of the interference of related wiring for the circuit function module 5 of PCB circuit board 4.
The EMC design can be applied to various information electronic system and equipment, power electronic system and equipment.
Exemplified as above is only to the utility model for example, not constituting to the protection scope of the utility model
Limitation, within all designs the same or similar with the utility model all belong to the scope of protection of the present invention.
Claims (7)
1. a kind of EMI based on PCB functional circuit filters bracing means, including PCB circuit board (4) and it is mounted in PCB circuit board (4)
On functional circuit, it is characterised in that: further include cabinet (1), chassis cover (3), EMI filtering integration module (6) and metal company
It connects device (7), the functional circuit and EMI filter the top and bottom formation EMI that integration module (6) are separately mounted to PCB circuit board (4)
The integrated pcb board of filtering and functional circuit, the stratum in the functional circuit region and EMI filter integration module (6) region
Stratum be not turned on, EMI filtering and the integrated pcb board of functional circuit are mounted in cabinet (1), the cabinet (1)
It is equipped with conductive rubber strip (2) between chassis cover (3) and the two is locked；
The signal exit of described filtering integration module one end EMI and functional circuit connects, and the other end and metal connector (7) are even
It connects, the filtering integration module and metal connector (7) are multiple and correspond.
2. a kind of EMI based on PCB functional circuit according to claim 1 filters bracing means, it is characterised in that: described
PCB circuit board (4) is reserved with closing conducting surface (9), the cabinet in the surrounding of each EMI filtering integration module (6) installation
(1) multiple independent cavitys (20) are equipped in, the position of cavity (20) is corresponding with the filtering position of integration module (6) EMI, each
Cavity (20) top surface is equipped with the conductive faying surface (10) with closing conducting surface (9) face.
3. a kind of EMI based on PCB functional circuit according to claim 1 filters bracing means, it is characterised in that: described
It is power-supply filter, number bus traffic filter, digital controlled signal filter, simulation control that EMI, which filters integration module (6),
One of traffic filter, pulse power/traffic filter, level signal filter circuit or a variety of electrical combinations.
4. a kind of EMI based on PCB functional circuit according to claim 1 filters bracing means, it is characterised in that: described
Locking flange (8) is also equipped in PCB circuit board (4), the locking flange (8) and metal connector (7) pass through conducting wire and EMI
Integration module (6) are filtered to be connected.
5. a kind of EMI based on PCB functional circuit according to claim 1 filters bracing means, it is characterised in that: described
The back side continuous conduction of chassis cover (3), chassis cover (3) and cabinet (1), conductive rubber strip (2) pass through the first screw (11)
Locking connection.
6. a kind of EMI based on PCB functional circuit according to claim 2 filters bracing means, it is characterised in that: described
Conducting surface (9) and electrical bonding face is closed to lock by the second screw (12).
7. a kind of EMI based on PCB functional circuit according to claim 4 filters bracing means, it is characterised in that: described
Flange (8) are locked to lock by third screw (13) and cabinet (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247666.3U CN209517856U (en) | 2018-12-29 | 2018-12-29 | A kind of EMI filtering bracing means based on PCB functional circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822247666.3U CN209517856U (en) | 2018-12-29 | 2018-12-29 | A kind of EMI filtering bracing means based on PCB functional circuit |
Publications (1)
| Publication Number | Publication Date |
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| CN209517856U true CN209517856U (en) | 2019-10-18 |
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ID=68198472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822247666.3U Active CN209517856U (en) | 2018-12-29 | 2018-12-29 | A kind of EMI filtering bracing means based on PCB functional circuit |
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| CN (1) | CN209517856U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2018
- 2018-12-29 CN CN201822247666.3U patent/CN209517856U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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