CN108768159A - Doubleway output DC power supply electromagnetic interface filter - Google Patents
Doubleway output DC power supply electromagnetic interface filter Download PDFInfo
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- CN108768159A CN108768159A CN201810797608.XA CN201810797608A CN108768159A CN 108768159 A CN108768159 A CN 108768159A CN 201810797608 A CN201810797608 A CN 201810797608A CN 108768159 A CN108768159 A CN 108768159A
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- circuit board
- power supply
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- capacitance
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Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F17/062—Toroidal core with turns of coil around it
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI filter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0035—Wound magnetic core
Abstract
The present invention provides a kind of doubleway output DC power supply electromagnetic interface filters, including casing, circuit board, six roots of sensation pin, further include common mode integrated inductor, capacitance and the resistance for integrating three bursts of coilings, it is equipped in circuit board for connecting common mode integrated inductor, capacitance and the circuit of resistance, common mode integrated inductor is parasitic inductance, capacitance is parasitic capacitance, and resistance is dead resistance.Common mode integrated inductor, capacitance and resistance are electrical connected, by being equipped with circuit in the circuit board to form double loop power supply filter circuit, to carry out power filter by the present invention；And common mode integrated inductor is parasitic inductance, capacitance is parasitic capacitance, and resistance is dead resistance；To in high band, these parasitic antennas are occupied an leading position, there is good electromagnetic compatibility characteristic to realize, and reduce double loop power supply filtering between influence each other, to when in applied to more power supply complete machines, occupied space can be reduced, reduce electromagnetic interference between device, improve complete machine electromagnetic compatible.
Description
Technical field
The invention belongs to filter fields, are to be related to a kind of doubleway output DC power supply electromagnetic interface filter more specifically.
Background technology
Power-supply filter currently on the market is single channel filtering, i.e., one-to-one operating mode.In this way in more power supply controls
In the machine system of system, it is necessary to filter be used alone for each power supply, and be easy to cause on a large scale using filter and be
System peripheral electron component resource cannot rationalize distribution, and the electromagnetic interference between device is strengthened in system operation,
Cause the Electro Magnetic Compatibility of complete machine poor.
Invention content
The purpose of the present invention is to provide a kind of doubleway output DC power supply electromagnetic interface filters, to solve to deposit in the prior art
Power-supply filter be applied to more power supply machine systems in, electromagnetic interference between device can be increased, lead to complete machine electromagnetic compatible
Property difference problem.
To achieve the above object, the technical solution adopted by the present invention is：A kind of doubleway output DC power supply EMI filtering is provided
Device includes casing with accommodating cavity, the circuit board being installed in the accommodating cavity, the six roots of sensation being electrical connected with the circuit board
Pin, one end of each pin is stretched into the accommodating cavity to be connected with the circuit board, and the other end of each pin is through institute
The casing is stretched out in the bottom surface for stating accommodating cavity, and the bottom of the casing corresponds to the trepanning for offering and being stretched out for the pin, described
Doubleway output DC power supply electromagnetic interface filter further includes the common mode integrated inductor for integrating three bursts of coilings and the common mode integrated inductor
Coordinate the capacitance and resistance that are filtered, be equipped in the circuit board for connect the common mode integrated inductor, the capacitance with
The resistance is to form the circuit of double loop power supply filter circuit, and the common mode integrated inductor is parasitic inductance, and the capacitance is to post
Raw capacitance, the resistance are dead resistance；Pin described in the six roots of sensation includes that one end respectively with the coiling of each stock is electrical connected
Three input pins and three output pins being electrical connected respectively with the other end of each stock coiling.
Further, each capacitance is the Surface Mount parasitic capacitance with high-frequency electromagnetic feature, and the capacitance is mounted on institute
It states on circuit board.
Further, the capacitance includes four differential mode capacitors and six common mode capacitances, and six common mode capacitances are along institute
The setting of width of circuit board direction is stated in two rows, and six common mode capacitance rectangular arrays are in the middle region of the circuit board
Domain, for four differential mode capacitors along width of circuit board direction setting in two row, the two row differential mode capacitors are respectively arranged on institute
State the both ends of circuit board length direction.
Further, the length direction of each common mode capacitance is parallel to the length direction of the circuit board, each difference
Length direction of the mould capacitance length direction perpendicular to the circuit board.
Further, each capacitance is set to the top surface of the circuit board, and the common mode integrated inductor is set to the circuit
The bottom surface of plate.
Further, the common mode integrated inductor is set to the central region of the circuit board.
Further, the common mode integrated inductor further includes ferrite bead, and three bursts of coilings are wound in the iron oxygen
On body magnet ring, three bursts of coilings are wound in respectively on three circumferential regions of the ferrite bead.
Further, shading ring, the shading ring are equipped on the ferrite bead between adjacent two bursts of coilings
It is placed on the ferrite bead.
Further, three bursts of coilings include two strands of single lines and one two-wire, and the two-wire includes being wound in institute side by side
State two conducting wires on ferrite bead；In three input pins：A piece input pin forms public input pin,
Another two input pins are respectively formed two single channel input pins；In three output pins：Piece output is drawn
Foot forms public output pin, and another two output pins are respectively formed two single channel output pins；The both ends of the two-wire
It is electrical connected respectively with the public input pin and the public output pin.
Further, three input pins are arranged in a row along the casing width direction, and three inputs are drawn
Foot is in one end of the casing length direction, three input pins：Institute is formed positioned at the intermediate input pin
Public input pin is stated, two input pins positioned at both ends are respectively formed two single channel input pins；Three institutes
It is in a row along casing width direction setting to state output pin, three output pins are set to the casing length direction
The other end, in three output pins：The public output pin is formed positioned at the intermediate output pin, is located at both ends
Two output pins be respectively formed two single channel output pins；Described in one of casing length direction side
The both ends of single channel input pin and a single channel output pin respectively with single line described in one are electrical connected, and the casing is long
Spend the direction other side a single channel input pin and a single channel output pin respectively with another stock single line
Both ends be electrical connected.
The advantageous effect of doubleway output DC power supply electromagnetic interface filter provided by the invention is：Compared with prior art, originally
Common mode integrated inductor, capacitance and resistance are electrical connected, by being equipped with circuit in the circuit board to form two-way electricity by invention
Power filter carries out power filter so that common mode integrated inductor, capacitance and resistance coordinate；And common mode integrated inductor is parasitic electricity
Sense, capacitance is parasitic capacitance, and resistance is dead resistance；To which in high band, these parasitic antennas are occupied an leading position, to realize tool
There is good electromagnetic compatibility characteristic, and reduce influencing each other between double loop power supply filtering, to applied to more power supply complete machines
When middle, occupied space can be reduced, reduce electromagnetic interference between device, improve complete machine electromagnetic compatible.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment for those of ordinary skill in the art without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the inside positive structure diagram of doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention；
Fig. 2 is the inside side structure schematic view of doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention；
Fig. 3 is the inside top structural schematic diagram of doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention；
Fig. 4 is the present invention looks up structural representation of doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention；
Fig. 5 is the present invention looks up structural representation of circuit board in doubleway output DC power supply electromagnetic interface filter shown in Fig. 3；
Fig. 6 is the structural schematic diagram of common mode integrated inductor in doubleway output DC power supply electromagnetic interface filter shown in Fig. 3；
Fig. 7 is the structural schematic diagram of circuit board top layer signals layer in Fig. 3；
Fig. 8 is the structural schematic diagram of circuit board top layer pad layer in Fig. 3；
Fig. 9 is the structural schematic diagram that circuit board top layer helps layer in Fig. 3；
Figure 10 is the structural schematic diagram of circuit board top layer silk-screen layer in Fig. 3；
Figure 11 is the structural schematic diagram of circuit board bottom layer signal layer in Fig. 3；
Figure 12 is the structural schematic diagram that circuit board bottom helps layer in Fig. 3；
Figure 13 is the structural schematic diagram of circuit board bottom overlay in Fig. 3；
Figure 14 is doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention under 50 Ω standards of load impedance
Common Mode insertion loss test curve；
Figure 15 is doubleway output DC power supply electromagnetic interface filter provided in an embodiment of the present invention under 50 Ω standards of load impedance
Differential Mode insertion loss test curve.
Wherein, each attached drawing main mark in figure：
10- casings；11- accommodating cavities；12- plate washers；13- cover boards；
20- pins；21- input pins；The public input pins of 211-；212- single channel input pins；22- output pins；
The public output pins of 221-；222- single channel output pins；
30- circuit boards；31- connection pads；
40- common mode integrated inductors；41- ferrite beads；42- coilings；421- two-wires；422- single lines；43- shading rings；
50- capacitances；51- differential mode capacitors；52- common mode capacitances；
60- casting glues；The first colloids of 61-；The second colloids of 62-；63- fixing glues.
Specific implementation mode
In order to make technical problems, technical solutions and advantages to be solved be more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
It should be noted that when element is referred to as " being fixed on " or " being set to " another element, it can be directly another
On one element or it is connected on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined." several " are meant that one or more, unless otherwise specifically defined.
In the description of the present invention, it is to be understood that, term "center", " length ", " width ", " thickness ", "upper",
The orientation or position of the instructions such as "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without referring to
Show or imply that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore cannot manage
Solution is limitation of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
The interaction relationship of connection or two elements inside two elements.It for the ordinary skill in the art, can be with
The concrete meaning of above-mentioned term in the present invention is understood as the case may be.
Term in the present invention：Electromagnetic interference (Electromagnetic Interference abbreviation EMI), literal translation is electromagnetism
Interference.
Also referring to Fig. 1 to Fig. 6, now doubleway output DC power supply electromagnetic interface filter provided by the invention is illustrated.
The doubleway output DC power supply electromagnetic interface filter, including casing 10, circuit board 30, common mode integrated inductor 40, capacitance 50, resistance
(not shown) and pin 20.Accommodating cavity 11 is offered in casing 10, the bottom of casing 10 offers connection accommodating cavity 11
Trepanning (not shown)；Circuit board 30 is mounted in accommodating cavity 11.Pin 20 is the six roots of sensation, and one end of each pin 20 is stretched into accommodating
It is electrical connected in chamber 11 and with circuit board 30, casing 10, and machine are stretched out in bottom surface of the other end through accommodating cavity 11 of each pin 20
The quantity of trepanning is to correspond with pin 20 on shell 10, then the other end of each pin 20 stretches into casing 10 from corresponding aperture, with
Connection is facilitated to use.Three bursts of coilings 42 are integrated on common mode integrated inductor 40, to reduce inductance volume, six roots of sensation pin 20 includes point
What three input pins 21 that one end of not each stock coiling 42 is electrical connected and the respectively other end of each stock coiling 42 were electrical connected
Three output pins 22, i.e. six roots of sensation pin 20 are divided into three input pins 21 and three output pins 22；Common mode integrated inductor 40
The both ends of each stock coiling 42 input pin 21 and an output pin 22 is electrically connected；Line is equipped in circuit board 30
Common mode integrated inductor 40, capacitance 50 are electrical connected by road with resistance, to form double loop power supply filter circuit, so as to common mode
Integrated inductor 40, capacitance 50 and resistance cooperation carry out power filter；Common mode integrated inductor 40 is parasitic inductance, and capacitance 50 is parasitism
Capacitance, resistance are dead resistance；To which in high band, these parasitic antennas are occupied an leading position, there is good electromagnetism to realize
Compatibility feature, and reduce double loop power supply filtering between influence each other.
Doubleway output DC power supply electromagnetic interface filter provided by the invention, compared with prior art, the present invention passes through in circuit
It is equipped with circuit in plate 30, common mode integrated inductor 40, capacitance 50 are electrical connected with resistance, to form double loop power supply filtered electrical
Road, so that common mode integrated inductor 40, capacitance 50 and resistance cooperation carry out power filter；And common mode integrated inductor 40 is parasitic electricity
Sense, capacitance 50 are parasitic capacitance, and resistance is dead resistance；To which in high band, these parasitic antennas are occupied an leading position, to realize
With good electromagnetic compatibility characteristic, and reduce influencing each other between double loop power supply filtering, to whole applied to more power supplys
When in machine, occupied space can be reduced, reduce electromagnetic interference between device, improve complete machine electromagnetic compatible.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, each capacitance 50 are the Surface Mount parasitic capacitance with high-frequency electromagnetic feature, and capacitance 50 is mounted on circuit board 30
On, so as to reduce occupancy volume, realize miniaturization with it is integrated, ensure with good electromagnetic compatibility characteristic.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, capacitance 50 include four differential mode capacitors 51 and six common mode capacitances 52, and six common mode capacitances 52 are along circuit
The setting of 30 width direction of plate is in two rows, and six 52 rectangular arrays of common mode capacitance are in the central region of circuit board 30, four differences
For mould capacitance 51 along the setting of 30 width direction of circuit board in two row, two row differential mode capacitors 51 are respectively arranged on 30 length direction of circuit board
Both ends.The topology layout can preferably utilize the spatial area on circuit board 30, reduce the space occupied, to reduce circuit
The volume of plate 30, so realize the miniaturization of the doubleway output DC power supply electromagnetic interface filter made with it is integrated, while can subtract
Influencing each other between small capacitances 50.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, the length direction of each common mode capacitance 52 are parallel to the length direction of circuit board 30, and each differential mode capacitor 51 is grown
Spend length direction of the direction perpendicular to circuit board 30.The topology layout can effectively further utilize the sky on circuit board 30
Between area, reduce the space occupied further realize the doubleway output DC power supply of making to reduce the volume of circuit board 30
The miniaturization of electromagnetic interface filter with it is integrated.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, each capacitance 50 are set to the top surface of circuit board 30, and common mode integrated inductor 40 is set to the bottom surface of circuit board 30.It should
Structure can reduce influencing each other between common mode integrated inductor 40 and capacitance 50, reduce loss, while can more effective profit
With the area on circuit board 30, and then the area of circuit board 30 can be reduced, realize the doubleway output DC power supply EMI filters of making
The miniaturization of wave device with it is integrated.It can not be contacted, be kept away with the bottom surface of accommodating cavity 11 with capacitance 50 in protection circuit plates 30 simultaneously
Exempt from each capacitance 50 is caused to fail by mechanical stress.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, common mode integrated inductor 40 are set to the central region of circuit board 30.The structure can be efficiently used further
Area on circuit board 30, and then the area of circuit board 30 can be reduced, realize the doubleway output DC power supply EMI filtering of making
The miniaturization of device with it is integrated.
Further, it please refers to Fig.1 to Fig.3, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, the bottom surface of circuit board 30 is additionally provided with the fixing glue 63 for being bonded common mode integrated inductor 40, to fix
Common mode integrated inductor 40, ease of assembly.
Further, it please refers to Fig.1, Fig. 5 and Fig. 6, as doubleway output DC power supply electromagnetic interface filter provided by the invention
A kind of specific implementation mode, common mode integrated inductor 40 further includes ferrite bead 41, and three bursts of coilings 42 are wound in ferrite magnetic
On ring 41, three bursts of coilings 42 are wound in respectively on three circumferential regions of ferrite bead 41.The topology layout can make each
Stock 42 load current of coiling results from the magnetic field generated in ferrite bead 41 and substantially offsets and reduce, so as to effectively solve
Common mode inductance saturation problem in two-way filtering.
Further, it please refers to Fig.1, Fig. 5 and Fig. 6, as doubleway output DC power supply electromagnetic interface filter provided by the invention
A kind of specific implementation mode, shading ring 43,43 sets of shading ring are equipped on ferrite bead 41 between adjacent two bursts of coilings 42
In on ferrite bead 41.Shading ring 43 is set, between the magnetic field that can further decrease each 42 load current of stock coiling generation
Influence each other, to be preferably filtered, preferably solve two-way filtering in common mode inductance saturation problem.
Further, it please refers to Fig.1, Fig. 5 and Fig. 6, as doubleway output DC power supply electromagnetic interface filter provided by the invention
A kind of specific implementation mode, three bursts of coilings 42 include two strands of single lines 422 and one two-wire 421, and two-wire 421 includes coiling side by side
In two conducting wires on ferrite bead 41.In three input pins 21：A piece input pin 21 forms public defeated
Enter pin 211, another two input pins 21 are respectively formed two single channel input pins 212；Three output pins 22
In：A piece output pin 22 forms public output pin 221, and another two output pins 22 are respectively formed two single channel
Output pin 222；The both ends of the two-wire 421 are electric with the public input pin 211 and the public output pin 221 respectively
Property be connected, to when in use, each 42 load current of stock coiling results from the magnetic field generated in ferrite bead 41 can be more preferable
Cancel out each other, to preferably solve two-way filtering in common mode inductance saturation problem；And the structure can make this pair
Road export DC power supply electromagnetic interface filter can single channel use, and can simultaneously be used with two-way.
Further, each coiling 42 is enameled wire, to reduce occupied space, while reducing cost.Further, it makes
Two conducting wires of two-wire 421 may be enameled wire, to reduce occupied space.
Further, it please refers to Fig.1, Fig. 5 and Fig. 6, as doubleway output DC power supply electromagnetic interface filter provided by the invention
A kind of specific implementation mode, three input pins 21 along 10 width direction of casing be arranged it is in a row, three input pins 21 are set
In one end of 10 length direction of casing, three input pins 21：Above-mentioned public input is formed positioned at intermediate input pin 21
Pin 211, two input pins 21 positioned at both ends are respectively formed two above-mentioned single channel input pins 212；Three output pins
22 is in a row along the setting of 10 width direction of casing, and three output pins 22 are set to the other end of 10 length direction of casing, and three defeated
Go out in pin 22：Above-mentioned public output pin 221 is formed positioned at intermediate output pin 22, is located at two output pins at both ends
22 are respectively formed two above-mentioned single channel output pins 222；A piece single channel input pin 212 and one of 10 length direction side of casing
Both ends of the root single channel output pin 222 respectively with one single line 422 are electrical connected, a list of the 10 length direction other side of casing
The both ends of road input pin 212 and a single channel output pin 222 respectively with another strand of single line 422 are electrical connected.The structure cloth
Office, it is easy to use convenient for distinguishing.
Further, it please refers to Fig.1 to Fig. 5, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Specific implementation mode is planted, six connection pads 31 are correspondingly provided on circuit board 30, six pins 20 connect pad with six respectively
31 are connected, to facilitate connection.
Further, correspond on circuit board 30 in connection pad 31 and offer via (not marked in figure), each pin 20
One end pass through via, and with connect pad 31 be connected, with facilitate connect.
Further, spring (not shown) is set on each pin 20, spring is located at the top surface of circuit board 30, spring
One end be weldingly connected with respective pins 20, the other end of spring is weldingly connected with pad 31 is correspondingly connected with.The structure spring can
To play cushioning effect, shock resistance, shock resistance are improved.
Further, it please refers to Fig.1 and Fig. 2, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, the top surface of casing 10 offer the opening (not marked in figure) of connection accommodating cavity 11, and open upper cover is equipped with
Cover board 13, cover board 13 are weldingly connected by parallel seam sealing machine and casing 10.The structure can protect accommodating cavity by cover board 13
Each device in 11, while leakproofness can be improved.
Further, it please refers to Fig.1 and Fig. 2, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
The middle part protrusion of kind specific implementation mode, the bottom surface both side of casing 10 is equipped with plate washer 12, when installing and using, to play
Good supporting role.
Further, it please refers to Fig.1 and Fig. 2, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Specific implementation mode is planted, casting glue 60 is filled in accommodating cavity 11.In accommodating cavity 11 fill casting glue 60, can preferably by
Circuit board 30, casing 10, each device on circuit board 30, if common mode integrated inductor 40, each capacitance 50 and pin 20 are integrally fixed,
To improve anti-vibration, shock resistance, sealing and salt spray resistance ability, the environment of enhanced products adapts to reliability.
Further, it please refers to Fig.1 and Fig. 2, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, casting glue 60 include the first colloid 61 being set between 11 bottom surface of accommodating cavity and circuit board 30 and are set to electric
Second colloid 62 of 30 top surface of road plate.The structure is more convenient to be made.Such as in processing and fabricating, to 11 bottom of accommodating cavity injection first
Then circuit board 30 is mounted in accommodating cavity 11 by colloid 61, the first colloid 61 is made to cure, and fixing circuit board 30, the structure
It, can better fixing circuit board 30 and each device in assembling；After the first colloid 61 cures, the second colloid 62 is refilled,
Influence when reducing embedding to circuit board 30 and each device, preferably ensures quality.
Further, A/B glue embeddings may be used in casting glue 60, improve the doubleway output DC power supply EMI filtering of making
The anti-vibration of device, impact resistance.
Further, casing 10 uses metal shell, and is encapsulated using parallel seam welding formula, and metal shell material is 10# steel,
Plating nickel on surface, and it is gold-plated in each pin 20, to improve the adaptives capacity to environment such as sealing, moisture-proof and salt spray resistance.
Further, it also referring to Fig. 7 to Figure 13, is filtered as doubleway output DC power supply EMI provided by the invention
A kind of specific implementation mode of device, Fig. 7 are the structural schematic diagram of 30 top layer signals layer of circuit board, and as seen from the figure, circuit board 30 pushes up
Layer includes six top layer signals lines 331 and a top layer M signal line 332, and top layer M signal line 332 is along circuit board 30
Width direction is arranged, and top layer M signal line 332 is located at the intermediate region of 30 length direction of circuit board, six top layer signals
Line 331 is divided into two groups, and two groups of top layer signals lines 331 are symmetricly set on the both sides of top layer M signal line 332.Fig. 8 is circuit board
The structural schematic diagram of 30 top layer pad layers, circuit board 30 are equipped with to form eight top layer ends of four differential mode capacitors 51 of connection
It prints pad 341 and prints pad 342 to the 12 top layers middle part for forming six common mode capacitances 52 of connection in side.Fig. 9 is electricity
Plate 30 top layer in road helps the structural schematic diagram of layer, and as seen from the figure, 30 top layer of circuit board is provided with eight for facilitating connection differential mode
The top layer end edge of capacitance 51 helps in the middle part of top layer of the pad 351,12 for facilitating connection common mode capacitance 52 and helps pad 352, two
It is a to facilitate that the top layer side for fixing the circuit board 30 helps pad 354 and six facilitate the top layer foot for being electrically connected each pin 20 to help weldering
Disk 353, six top layer feet help pad 353 corresponding with the position of six pins 20, and two top layer sides help pad 354 to be located at
30 length direction both sides of circuit board, and two top layer sides help pad 354 to be located at the middle part of 30 length direction of circuit board
The circuit board 30 is fixed in casing 10 by region with facilitating.Figure 10 is the structural schematic diagram of 30 top layer silk-screen layer of circuit board, from
And top layer silk-screen line 361 is formed in 30 top surface of circuit board, to carry out suggesting effect, facilitate the connection of each device.
Figure 11 is the structural schematic diagram of 30 bottom layer signal layer of circuit board, and as seen from the figure, 30 bottom of circuit board includes six
Bottom layer signal line 333 and a bottom M signal line 334, bottom M signal line 334 are arranged along 30 width direction of circuit board,
And bottom M signal line 334 is located at the intermediate region of 30 length direction of circuit board, and six bottom layer signal lines 333 are divided into two
Group, two groups of bottom layer signal lines 333 are symmetricly set on the both sides of bottom M signal line 334.Figure 12 is that 30 bottom of circuit board helps weldering
The structural schematic diagram of layer, as seen from the figure, there are two facilitate the bottom side for fixing the circuit board 30 to help to the setting of 30 bottom of circuit board
Pad 355 and six facilitate the bottom foot for being electrically connected each pin 20 that pad 356, six bottom feet is helped to help pad 356 and six
The position of pin 20 corresponds to, and two bottom sides help pad 355 to be located at 30 length direction both sides of circuit board, and two bottoms
Layer side helps pad 355 to be located at the central region of 30 length direction of circuit board, and the circuit board 30 is fixed on machine to facilitate
In shell 10.Figure 13 is the structural schematic diagram of 30 bottom overlay of circuit board, to form bottom silk-screen line in 30 top surface of circuit board
362, to carry out suggesting effect, facilitate the connection of each device.
Further, it please refers to Fig.1 to Fig. 6, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, which further includes magnetic bead (not shown), is opened up in each magnetic bead
There is through-hole, magnetic bead is respectively installed on each pin 20, magnetic bead is for inhibiting the high-frequency noise on signal wire or power cord and spike
Interference, and each magnetic bead is set between circuit board 30 and the bottom surface of accommodating cavity 11；To which electric current enters circuit board 30 from pin 20
Before magnetic bead can be passed through before filtering inhibits high-frequency noise to be interfered with spike, and electric current exports after the filtering of circuit board 30 through pin 20
Will also pass through magnetic bead inhibits high-frequency noise to be interfered with spike, with preferably to the high-frequency noise and spike on signal wire or power cord
Interference carries out inhibition filtering, improves filter effect.In addition, open up through-hole (not marked in figure) in magnetic bead, and by each magnetic bead set
It on corresponding pin 20, is arranged and fixed conveniently, and multiple magnetic beads is set, can improve to the high frequency on signal wire or power cord
Noise with spike interference inhibit the effect of filtering, while the structure can also reduce volume, facilitates each magnetic bead of layout, simultaneously
Improve the installation reliability of each electronic device on circuit board 30.
Further, it please refers to Fig.1 to Fig. 6, one as doubleway output DC power supply electromagnetic interface filter provided by the invention
Kind specific implementation mode, each magnetic bead in a ring, reduce corner angle, with preferably to the high-frequency noise and point on signal wire or power cord
Peak interference carries out inhibition filtering.
Passive LC device may be used in the doubleway output DC power supply electromagnetic interface filter that the present invention makes, and using parasitic ginseng
Number is small and can provide the capacitance 50 of good electromagnetic property (i.e. using small, parasitic parameter is small and has in very high frequency
The capacitance 50 of high frequency electromagnetic characteristics), and Surface Mount is mounted on circuit board 30, with realize miniaturization with it is integrated, ensure with good
Good electromagnetic compatibility characteristic.
Similarly, the doubleway output DC power supply electromagnetic interface filter that the present invention makes, may be used Passive LC device, and use
Parasitic parameter it is small and also can very high frequency provide good electromagnetic property resistance (use small, parasitic parameter small and
Resistance with high frequency electromagnetic characteristics), and Surface Mount be mounted on circuit board 30 on, with realize miniaturization with it is integrated, ensure have
Good electromagnetic compatibility characteristic.
Further, doubleway output DC power supply electromagnetic interface filter of the invention is in the substandard common modes of 50 Ω of load impedance
Insertion loss test curve is as shown in figure 14, and Differential Mode insertion loss test curve is as shown in figure 15.Abscissa is frequency in Figure 14
(Hz), ordinate is decibel (dB), and line a indicates insertion loss；Abscissa is frequency (Hz) in Figure 15, and ordinate is decibel
(dB), line b indicates insertion loss；From Figure 14 and Figure 15 it is found that the doubleway output DC power supply electromagnetic interface filter of the present invention is with good
Good filtering performance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
- Include casing with accommodating cavity, the circuit being installed in the accommodating cavity 1. doubleway output DC power supply electromagnetic interface filter Plate, the six roots of sensation pin being electrical connected with the circuit board, one end of each pin stretch into the accommodating cavity with the circuit Plate is connected, and the casing is stretched out in bottom surface of the other end through the accommodating cavity of each pin, and the bottom of the casing, which corresponds to, opens Equipped with the trepanning stretched out for the pin, it is characterised in that：The doubleway output DC power supply electromagnetic interface filter further includes integrated three The common mode integrated inductor of stock coiling coordinates the capacitance and resistance that are filtered with the common mode integrated inductor, in the circuit board Equipped with for connecting the common mode integrated inductor, the capacitance and the resistance to form the circuit of double loop power supply filter circuit, The common mode integrated inductor is parasitic inductance, and the capacitance is parasitic capacitance, and the resistance is dead resistance；Pin described in the six roots of sensation Including three input pins being electrical connected respectively with one end of each stock coiling and another with the coiling of each stock respectively Hold three output pins being electrical connected.
- 2. doubleway output DC power supply electromagnetic interface filter as described in claim 1, it is characterised in that：Each capacitance be with The Surface Mount parasitic capacitance of high-frequency electromagnetic feature, the capacitance are mounted on the circuit board.
- 3. doubleway output DC power supply electromagnetic interface filter as claimed in claim 2, it is characterised in that：The capacitance includes four Differential mode capacitor and six common mode capacitances, six common mode capacitances along width of circuit board direction setting in two rows, and six The common mode capacitance rectangular array is in the central region of the circuit board, and four differential mode capacitors are along the width of circuit board Direction setting is respectively arranged on the both ends of the circuit board length direction in two row, the two row differential mode capacitors.
- 4. doubleway output DC power supply electromagnetic interface filter as claimed in claim 3, it is characterised in that：Each common mode capacitance Length direction is parallel to the length direction of the circuit board, length of each differential mode capacitor length direction perpendicular to the circuit board Spend direction.
- 5. doubleway output DC power supply electromagnetic interface filter as claimed in claim 3, it is characterised in that：Each capacitance is set to institute The top surface of circuit board is stated, the common mode integrated inductor is set to the bottom surface of the circuit board.
- 6. doubleway output DC power supply electromagnetic interface filter as claimed in claim 5, it is characterised in that：The common mode integrated inductor Set on the central region of the circuit board.
- 7. doubleway output DC power supply electromagnetic interface filter as described in claim 1, it is characterised in that：The common mode integrated inductor Further include ferrite bead, three bursts of coilings are wound on the ferrite bead, and three bursts of coilings are wound in institute respectively It states on three circumferential regions of ferrite bead.
- 8. doubleway output DC power supply electromagnetic interface filter as claimed in claim 7, it is characterised in that：On the ferrite bead Shading ring is equipped between adjacent two bursts of coilings, the barrier cuff is on the ferrite bead.
- 9. doubleway output DC power supply electromagnetic interface filter as claimed in claim 7, it is characterised in that：Three bursts of coilings include Two strands of single lines and one two-wire, the two-wire includes two conducting wires being wound in side by side on the ferrite bead；Described in three In input pin：A piece input pin forms public input pin, and another two input pins are respectively formed two lists Road input pin；In three output pins：A piece output pin forms public output pin, another two output Pin is respectively formed two single channel output pins；The both ends of the two-wire respectively with the public input pin and described public defeated Go out pin to be electrical connected.
- 10. doubleway output DC power supply electromagnetic interface filter as claimed in claim 9, it is characterised in that：Three input pins It is arranged along the casing width direction in a row, three input pins are set to one end of the casing length direction, three In the input pin：The public input pin is formed positioned at the intermediate input pin, described in be located at both ends two Input pin is respectively formed two single channel input pins；Three output pins are arranged to along the casing width direction One row, three output pins are set to the other end of the casing length direction, in three output pins：Positioned at centre The output pin form the public output pin, two output pins positioned at both ends are respectively formed described in two Single channel output pin；A single channel input pin and a single channel output pin for casing length direction side The both ends with single line described in one are electrical connected respectively, a single channel input pin of the casing length direction other side Both ends with a single channel output pin respectively with another stock single line are electrical connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810797608.XA CN108768159A (en) | 2018-07-19 | 2018-07-19 | Doubleway output DC power supply electromagnetic interface filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810797608.XA CN108768159A (en) | 2018-07-19 | 2018-07-19 | Doubleway output DC power supply electromagnetic interface filter |
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| CN108768159A true CN108768159A (en) | 2018-11-06 |
Family
ID=63970865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810797608.XA Pending CN108768159A (en) | 2018-07-19 | 2018-07-19 | Doubleway output DC power supply electromagnetic interface filter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212753A (en) * | 2019-07-09 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of power supply two-way filter |
| CN110417252A (en) * | 2019-07-17 | 2019-11-05 | 陕西千山航空电子有限责任公司 | A kind of power filter box |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528205A (en) * | 1994-03-30 | 1996-06-18 | Apple Computer, Inc. | Integrated electromagnetic interference filter |
| US5801597A (en) * | 1997-02-05 | 1998-09-01 | Lucent Technologies Inc. | Printed-circuit board-mountable ferrite EMI filter |
| US20040233015A1 (en) * | 2003-05-20 | 2004-11-25 | Ming-Chih Tsai | Electromagnetic interference filter |
| CN2785228Y (en) * | 2005-01-13 | 2006-05-31 | 中国科学院长春光学精密机械与物理研究所 | Power supply noise filter based on electromagnetic compatibility |
| JP2009117807A (en) * | 2007-11-08 | 2009-05-28 | Zhejiang Univ | Inductor/capacitor integrated part in emi filter |
| CN201656765U (en) * | 2010-02-12 | 2010-11-24 | Emif科技有限公司 | EMI filter |
| CN202889189U (en) * | 2012-11-02 | 2013-04-17 | 上海儒竞电子科技有限公司 | Direct-current electromagnetic interference filter circuit |
| US20130322124A1 (en) * | 2011-02-17 | 2013-12-05 | Salcomp Oyj | Power supply with interference suppression, and method for operating a power supply |
| CN204145292U (en) * | 2014-11-06 | 2015-02-04 | 昆明通渡电气有限公司 | A kind of high power switching power supply Electro Magnetic Compatibility filter and filter assembly thereof |
| CN205828054U (en) * | 2016-07-22 | 2016-12-21 | 安庆大众电子科技有限公司 | A kind of many circuit signals suppression common mode inductance |
| CN206076023U (en) * | 2016-08-28 | 2017-04-05 | 天津光电惠高电子有限公司 | A kind of LLC transformators |
| CN206293242U (en) * | 2017-01-06 | 2017-06-30 | 东莞市健阳达电子有限公司 | A kind of multi cord inductance |
| CN206452292U (en) * | 2017-01-24 | 2017-08-29 | 成都新欣神风电子科技有限公司 | Power-supply filter |
| KR20180071827A (en) * | 2016-12-20 | 2018-06-28 | 엘지이노텍 주식회사 | Magnetic core, inductor and emi filter comprising the same |
| CN208797830U (en) * | 2018-07-19 | 2019-04-26 | 深圳振华富电子有限公司 | Doubleway output DC power supply electromagnetic interface filter |
-
2018
- 2018-07-19 CN CN201810797608.XA patent/CN108768159A/en active Pending
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5528205A (en) * | 1994-03-30 | 1996-06-18 | Apple Computer, Inc. | Integrated electromagnetic interference filter |
| US5801597A (en) * | 1997-02-05 | 1998-09-01 | Lucent Technologies Inc. | Printed-circuit board-mountable ferrite EMI filter |
| US20040233015A1 (en) * | 2003-05-20 | 2004-11-25 | Ming-Chih Tsai | Electromagnetic interference filter |
| CN2785228Y (en) * | 2005-01-13 | 2006-05-31 | 中国科学院长春光学精密机械与物理研究所 | Power supply noise filter based on electromagnetic compatibility |
| JP2009117807A (en) * | 2007-11-08 | 2009-05-28 | Zhejiang Univ | Inductor/capacitor integrated part in emi filter |
| CN201656765U (en) * | 2010-02-12 | 2010-11-24 | Emif科技有限公司 | EMI filter |
| US20130322124A1 (en) * | 2011-02-17 | 2013-12-05 | Salcomp Oyj | Power supply with interference suppression, and method for operating a power supply |
| CN202889189U (en) * | 2012-11-02 | 2013-04-17 | 上海儒竞电子科技有限公司 | Direct-current electromagnetic interference filter circuit |
| CN204145292U (en) * | 2014-11-06 | 2015-02-04 | 昆明通渡电气有限公司 | A kind of high power switching power supply Electro Magnetic Compatibility filter and filter assembly thereof |
| CN205828054U (en) * | 2016-07-22 | 2016-12-21 | 安庆大众电子科技有限公司 | A kind of many circuit signals suppression common mode inductance |
| CN206076023U (en) * | 2016-08-28 | 2017-04-05 | 天津光电惠高电子有限公司 | A kind of LLC transformators |
| KR20180071827A (en) * | 2016-12-20 | 2018-06-28 | 엘지이노텍 주식회사 | Magnetic core, inductor and emi filter comprising the same |
| CN206293242U (en) * | 2017-01-06 | 2017-06-30 | 东莞市健阳达电子有限公司 | A kind of multi cord inductance |
| CN206452292U (en) * | 2017-01-24 | 2017-08-29 | 成都新欣神风电子科技有限公司 | Power-supply filter |
| CN208797830U (en) * | 2018-07-19 | 2019-04-26 | 深圳振华富电子有限公司 | Doubleway output DC power supply electromagnetic interface filter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212753A (en) * | 2019-07-09 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of power supply two-way filter |
| CN110417252A (en) * | 2019-07-17 | 2019-11-05 | 陕西千山航空电子有限责任公司 | A kind of power filter box |
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