CN108768159B - Dual-output direct-current power supply EMI filter - Google Patents
Dual-output direct-current power supply EMI filter Download PDFInfo
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- CN108768159B CN108768159B CN201810797608.XA CN201810797608A CN108768159B CN 108768159 B CN108768159 B CN 108768159B CN 201810797608 A CN201810797608 A CN 201810797608A CN 108768159 B CN108768159 B CN 108768159B
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- 229910000859 α-Fe Inorganic materials 0.000 claims description 21
- 230000009977 dual effect Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 17
- 230000004907 flux Effects 0.000 description 15
- 238000005476 soldering Methods 0.000 description 15
- 230000010354 integration Effects 0.000 description 7
- 239000000084 colloidal system Substances 0.000 description 6
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 239000000565 sealant Substances 0.000 description 4
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- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004382 potting Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Filters And Equalizers (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention provides a double-output direct-current power supply EMI filter, which comprises a shell, a circuit board, six pins, and further comprises a common-mode integrated inductor, a capacitor and a resistor, wherein the common-mode integrated inductor, the capacitor and the resistor are integrated by three windings, a circuit for connecting the common-mode integrated inductor, the capacitor and the resistor is arranged in the circuit board, the common-mode integrated inductor is parasitic inductance, the capacitor is parasitic capacitance, and the resistor is parasitic resistance. According to the invention, the circuit board is provided with the circuit to electrically connect the common mode integrated inductor and the capacitor with the resistor, so that a double-path power supply filter circuit is formed for power supply filtering; the common mode integrated inductor is parasitic inductance, the capacitor is parasitic capacitance, and the resistor is parasitic resistance; therefore, in a high frequency band, the parasitic elements are dominant, so that good electromagnetic compatibility is realized, the mutual influence between two-way power supply filters is reduced, and therefore, when the device is applied to a multi-power-supply complete machine, the occupied space can be reduced, the electromagnetic interference among devices is reduced, and the electromagnetic compatibility of the complete machine is improved.
Description
Technical Field
The invention belongs to the field of filters, and particularly relates to an EMI filter of a double-output direct-current power supply.
Background
The current power filters in the market are all single-path filters, namely one-to-one working modes. In the whole system controlled by multiple power supplies, a filter is required to be used for each power supply independently, and the filter is used in a large range, so that the resources of peripheral electronic components of the system cannot be allocated reasonably easily, electromagnetic interference among the components is enhanced when the system operates, and the electromagnetic compatibility of the whole system is poor.
Disclosure of Invention
The invention aims to provide a double-output direct-current power supply EMI filter, which solves the problem that the electromagnetic compatibility of a whole machine is poor because electromagnetic interference among devices can be increased when a power supply filter in the prior art is applied to a multi-power supply whole machine system.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a double-output direct current power supply EMI wave filter, including the casing that has the holding chamber, install in the circuit board in the holding chamber, with six pins that circuit board electricity links to each other, each one end of pin stretches into in the holding chamber with circuit board links to each other, each other end of pin stretches out the casing through the bottom surface of holding chamber, the trompil that supplies the pin to stretch out is seted up corresponding to the bottom of casing, double-output direct current power supply EMI wave filter still includes integrated inductance of integrated three-ply wire winding, with common mode integrated inductance cooperation carries out electric capacity and the resistance of filtering, be equipped with in the circuit board and be used for connecting common mode integrated inductance, electric capacity with the circuit of resistance in order to form double-circuit power supply filter circuit, common mode integrated inductance is parasitic inductance, the electric capacity is parasitic capacitance, the resistance is parasitic resistance; the six pins comprise three input pins which are respectively and electrically connected with one end of each winding and three output pins which are respectively and electrically connected with the other end of each winding.
Further, each capacitor is a surface-mounted parasitic capacitor with high-frequency electromagnetic characteristics, and the capacitor is mounted on the circuit board.
Further, the capacitors include four differential mode capacitors and six common mode capacitors, six common mode capacitors are arranged in two rows along the width direction of the circuit board, six common mode capacitors are arranged in the middle area of the circuit board in a rectangular array, four differential mode capacitors are arranged in two columns along the width direction of the circuit board, and two columns of differential mode capacitors are respectively arranged at two ends of the length direction of the circuit board.
Further, the length direction of each common mode capacitor is parallel to the length direction of the circuit board, and the length direction of each differential mode capacitor is perpendicular to the length direction of the circuit board.
Further, each capacitor is arranged on the top surface of the circuit board, and the common mode integrated inductor is arranged on the bottom surface of the circuit board.
Further, the common mode integrated inductor is arranged in the middle area of the circuit board.
Further, the common mode integrated inductor further comprises a ferrite bead, three wires are wound on the ferrite bead, and the three wires are respectively wound on three areas of the circumference of the ferrite bead.
Further, an isolating ring is arranged between two adjacent windings on the ferrite magnetic ring, and the isolating ring is sleeved on the ferrite magnetic ring.
Further, the three strands of windings comprise two single wires and one double wire, and the double wire comprises two wires wound on the ferrite magnetic ring side by side; three of the input pins: one input pin forms a common input pin, and the other two input pins respectively form two single-way input pins; three of the output pins: one output pin forms a public output pin, and the other two output pins respectively form two single-way output pins; and two ends of the double-wire are respectively and electrically connected with the public input pin and the public output pin.
Further, three input pins are arranged in a row along the width direction of the casing, three input pins are arranged at one end of the length direction of the casing, and three input pins are arranged in the following parts: the input pins positioned in the middle form the public input pins, and the two input pins positioned at the two ends respectively form the two single-way input pins; the three output pins are arranged in a row along the width direction of the shell, the three output pins are arranged at the other end of the length direction of the shell, and the three output pins are arranged in the following parts: the output pins positioned in the middle form the public output pins, and the two output pins positioned at the two ends respectively form two single-way output pins; one single-way input pin and one single-way output pin on one side of the length direction of the shell are respectively and electrically connected with two ends of one single wire, and one single-way input pin and one single-way output pin on the other side of the length direction of the shell are respectively and electrically connected with two ends of the other single wire.
The dual-output direct-current power supply EMI filter provided by the invention has the beneficial effects that: compared with the prior art, the circuit board is provided with the circuit to electrically connect the common-mode integrated inductor and the capacitor with the resistor, so that a double-path power supply filter circuit is formed, and the common-mode integrated inductor, the capacitor and the resistor are matched to perform power supply filtering; the common mode integrated inductor is parasitic inductance, the capacitor is parasitic capacitance, and the resistor is parasitic resistance; therefore, in a high frequency band, the parasitic elements are dominant, so that good electromagnetic compatibility is realized, the mutual influence between two-way power supply filters is reduced, and therefore, when the device is applied to a multi-power-supply complete machine, the occupied space can be reduced, the electromagnetic interference among devices is reduced, and the electromagnetic compatibility of the complete machine is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the internal front view structure of an EMI filter of a dual-output dc power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an internal side view structure of an EMI filter of a dual-output dc power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal top view structure of an EMI filter of a dual-output dc power supply according to an embodiment of the present invention;
fig. 4 is a schematic bottom view of a two-way output EMI filter for a dc power supply according to an embodiment of the present invention;
FIG. 5 is a schematic diagram showing a bottom view of a circuit board in the dual-output DC power EMI filter shown in FIG. 3;
Fig. 6 is a schematic structural diagram of a common mode integrated inductor in the EMI filter of the dual-output dc power supply shown in fig. 3;
FIG. 7 is a schematic diagram of a top signal layer of the circuit board shown in FIG. 3;
FIG. 8 is a schematic diagram of the structure of the top pad layer of the circuit board of FIG. 3;
FIG. 9 is a schematic diagram of the top soldering flux layer of the circuit board of FIG. 3;
FIG. 10 is a schematic diagram of the structure of the top silk-screen layer of the circuit board in FIG. 3;
FIG. 11 is a schematic diagram of a bottom signal layer of the circuit board of FIG. 3;
FIG. 12 is a schematic view of the structure of the bottom solder mask layer of the circuit board of FIG. 3;
FIG. 13 is a schematic view of the structure of the bottom silk-screen layer of the circuit board in FIG. 3;
Fig. 14 is a graph showing a common mode insertion loss test curve of the EMI filter of the dual-output dc power supply according to the embodiment of the present invention under the standard of 50 Ω of load impedance;
fig. 15 is a test curve of a differential insertion loss of the EMI filter of the dual-output dc power supply according to the embodiment of the present invention under the standard of 50 Ω of load impedance.
Wherein, each reference numeral in the figure mainly marks:
10-a shell; 11-a receiving cavity; 12-baffle; 13-cover plate;
20-pins; 21-an input pin; 211-a common input pin; 212—single input pins; 22-output pins; 221-a common output pin; 222-single output pin;
30-a circuit board; 31-connection pads;
40-common mode integrated inductance; 41-ferrite magnetic rings; 42-winding; 421-two wire; 422-single line; 43-isolating ring;
50-capacitance; 51-differential mode capacitance; 52-common mode capacitance;
60-pouring sealant; 61-a first colloid; 62-a second colloid; 63-fixing glue.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The term in the present invention is: electromagnetic interference (Electromagnetic Interference abbreviated EMI), the transliteration is electromagnetic interference.
Referring to fig. 1 to 6, an EMI filter for a dual-output dc power supply according to the present invention will now be described. The dual output dc EMI filter includes a housing 10, a circuit board 30, a common mode integrated inductor 40, a capacitor 50, a resistor (not shown) and a pin 20. The casing 10 is provided with a containing cavity 11, and the bottom of the casing 10 is provided with an opening (not shown in the figure) communicated with the containing cavity 11; the circuit board 30 is mounted in the accommodating chamber 11. Six pins 20, one end of each pin 20 stretches into the accommodating cavity 11 and is electrically connected with the circuit board 30, the other end of each pin 20 stretches out of the machine shell 10 through the bottom surface of the accommodating cavity 11, the number of the holes on the machine shell 10 corresponds to the number of the pins 20 one by one, and then the other end of each pin 20 stretches into the machine shell 10 from the corresponding hole so as to be convenient to connect and use. The common mode integrated inductor 40 is integrated with three windings 42 to reduce the volume of the inductor, and the six pins 20 comprise three input pins 21 electrically connected with one end of each winding 42 and three output pins 22 electrically connected with the other end of each winding 42, i.e. the six pins 20 are divided into three input pins 21 and three output pins 22; two ends of each winding 42 of the common mode integrated inductor 40 are respectively and electrically connected with one input pin 21 and one output pin 22; the circuit board 30 is provided with a circuit for electrically connecting the common mode integrated inductor 40 and the capacitor 50 with the resistor, so that a double-path power supply filter circuit is formed, and the common mode integrated inductor 40, the capacitor 50 and the resistor are matched for power supply filtering; the common mode integrated inductor 40 is a parasitic inductor, the capacitor 50 is a parasitic capacitor, and the resistor is a parasitic resistor; thus, in the high frequency band, these parasitic elements are dominant to achieve good electromagnetic compatibility characteristics and to reduce interactions between the two-way power supply filters.
Compared with the prior art, the circuit board 30 is provided with the circuit to electrically connect the common-mode integrated inductor 40 and the capacitor 50 with the resistor, so that a double-path power supply filter circuit is formed, and the common-mode integrated inductor 40, the capacitor 50 and the resistor are matched to carry out power supply filtering; the common mode integrated inductor 40 is a parasitic inductor, the capacitor 50 is a parasitic capacitor, and the resistor is a parasitic resistor; therefore, in a high frequency band, the parasitic elements are dominant, so that good electromagnetic compatibility is realized, the mutual influence between two-way power supply filters is reduced, and therefore, when the device is applied to a multi-power-supply complete machine, the occupied space can be reduced, the electromagnetic interference among devices is reduced, and the electromagnetic compatibility of the complete machine is improved.
Further, referring to fig. 1 to 3, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, each capacitor 50 is a surface-mounted parasitic capacitor with high-frequency electromagnetic characteristics, and the capacitor 50 is mounted on the circuit board 30, so that the occupied volume can be reduced, miniaturization and integration are realized, and good electromagnetic compatibility is ensured.
Further, referring to fig. 1 to 3, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the capacitor 50 includes four differential mode capacitors 51 and six common mode capacitors 52, the six common mode capacitors 52 are arranged in two rows along the width direction of the circuit board 30, the six common mode capacitors 52 are arranged in a rectangular array in the middle area of the circuit board 30, the four differential mode capacitors 51 are arranged in two columns along the width direction of the circuit board 30, and the two differential mode capacitors 51 are respectively arranged at two ends of the circuit board 30 along the length direction. The structural layout can better utilize the space area on the circuit board 30, reduce the occupied space, reduce the volume of the circuit board 30, further realize the miniaturization and integration of the manufactured double-output direct-current power supply EMI filter, and reduce the mutual influence between the capacitors 50.
Further, referring to fig. 1 to 3, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the length direction of each common-mode capacitor 52 is parallel to the length direction of the circuit board 30, and the length direction of each differential-mode capacitor 51 is perpendicular to the length direction of the circuit board 30. The structural layout can further effectively utilize the space area on the circuit board 30 and reduce the occupied space so as to reduce the volume of the circuit board 30 and further realize the miniaturization and integration of the manufactured double-output direct-current power supply EMI filter.
Further, referring to fig. 1 to 3, as a specific embodiment of the EMI filter for a dual-output dc power supply provided by the present invention, each capacitor 50 is disposed on the top surface of the circuit board 30, and the common mode integrated inductor 40 is disposed on the bottom surface of the circuit board 30. The structure can reduce the mutual influence between the common-mode integrated inductor 40 and the capacitor 50, reduce loss, and simultaneously can more effectively utilize the area on the circuit board 30, thereby reducing the area of the circuit board 30 and realizing the miniaturization and integration of the manufactured two-way output direct-current power supply EMI filter. Meanwhile, the capacitor 50 on the circuit board 30 can be protected from contacting with the bottom surface of the accommodating cavity 11, and the failure caused by mechanical stress of each capacitor 50 can be avoided.
Further, referring to fig. 1 to 3, as an embodiment of the EMI filter for a dual-output dc power supply provided by the present invention, a common mode integrated inductor 40 is disposed in a middle area of the circuit board 30. The structure can further effectively utilize the area on the circuit board 30, so that the area of the circuit board 30 can be reduced, and the miniaturization and integration of the manufactured two-way output direct-current power supply EMI filter are realized.
Further, referring to fig. 1 to 3, as a specific embodiment of the EMI filter of the dual-output dc power supply provided by the present invention, a fixing adhesive 63 for adhering the common-mode integrated inductor 40 is further disposed on the bottom surface of the circuit board 30, so as to fix the common-mode integrated inductor 40, and facilitate assembly.
Further, referring to fig. 1, 5 and 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the common mode integrated inductor 40 further includes a ferrite bead 41, three windings 42 are wound on the ferrite bead 41, and the three windings 42 are respectively wound on three circumferential regions of the ferrite bead 41. The structural layout can greatly offset and reduce the magnetic field generated in the ferrite magnetic ring 41 by the load current of each winding 42, thereby effectively solving the common-mode inductance saturation problem in the double-path filtering process.
Further, referring to fig. 1, 5 and 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, a spacer ring 43 is disposed between two adjacent windings 42 on the ferrite bead 41, and the spacer ring 43 is sleeved on the ferrite bead 41. By arranging the isolating ring 43, the mutual influence between magnetic fields generated by the load current of each winding 42 can be further reduced, so that the filtering is better carried out, and the common-mode inductance saturation problem in the double-path filtering process is better solved.
Further, referring to fig. 1,5 and 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the three windings 42 include two single wires 422 and one double wire 421, and the double wire 421 includes two wires wound on the ferrite bead 41 side by side. Three of the input pins 21: one input pin 21 forms a common input pin 211, and the other two input pins 21 respectively form two single-path input pins 212; three of the output pins 22: one output pin 22 forms a common output pin 221, and the other two output pins 22 respectively form two single-path output pins 222; the two ends of the double wire 421 are respectively electrically connected with the common input pin 211 and the common output pin 221, so that when in use, the magnetic fields generated in the ferrite magnetic ring 41 by the load current of each winding 42 can be better offset, thereby better solving the common-mode inductance saturation problem in the double-path filtering process; the structure can enable the dual-output direct-current power supply EMI filter to be used in a single way and simultaneously in two ways.
Further, each winding 42 is an enameled wire, so as to reduce the occupied space and the cost. Furthermore, the two wires of the two wires 421 can be enameled wires to reduce the space.
Further, referring to fig. 1, 5 and 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, three input pins 21 are arranged in a row along the width direction of the casing 10, the three input pins 21 are arranged at one end of the casing 10 in the length direction, and the three input pins 21 are: the input pins 21 positioned in the middle form the common input pins 211, and the two input pins 21 positioned at the two ends respectively form the two single-way input pins 212; three output pins 22 are arranged in a row along the width direction of the casing 10, the three output pins 22 are arranged at the other end of the casing 10 in the length direction, and the three output pins 22 are as follows: the output pins 22 positioned in the middle form the common output pin 221, and the two output pins 22 positioned at the two ends respectively form the two single-path output pins 222; one single-path input pin 212 and one single-path output pin 222 on one side of the machine shell 10 in the length direction are respectively and electrically connected with two ends of one single wire 422, and one single-path input pin 212 and one single-path output pin 222 on the other side of the machine shell 10 in the length direction are respectively and electrically connected with two ends of the other single wire 422. This structural layout is convenient for distinguish, facilitates the use.
Further, referring to fig. 1 to 5, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, six connection pads 31 are correspondingly disposed on the circuit board 30, and the six pins 20 are respectively connected to the six connection pads 31 for convenient connection.
Further, a via hole (not shown) is formed in the circuit board 30 corresponding to the connection pad 31, and one end of each pin 20 passes through the via hole and is connected to the connection pad 31 for connection.
Further, each pin 20 is sleeved with a spring (not shown in the figure), the spring is located on the top surface of the circuit board 30, one end of the spring is welded with the corresponding pin 20, and the other end of the spring is welded with the corresponding connection pad 31. The structural spring can play a role in buffering, and the shock resistance and vibration resistance are improved.
Further, referring to fig. 1 and 2, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, an opening (not shown) communicating with the accommodating cavity 11 is formed in a top surface of the casing 10, a cover plate 13 is disposed on an upper cover of the opening, and the cover plate 13 is welded to the casing 10 by a parallel seam welder. This structure can protect the devices in the housing chamber 11 by the cover plate 13, and can improve the sealing property.
Further, referring to fig. 1 and 2, as a specific embodiment of the EMI filter for a dual-output dc power supply provided by the present invention, a baffle 12 is protruded from the middle of two sides of the bottom surface of the casing 10, so as to perform a good supporting function during installation and use.
Further, referring to fig. 1 and 2, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the accommodating cavity 11 is filled with a pouring sealant 60. The potting adhesive 60 is filled in the accommodating cavity 11, so that the circuit board 30, the machine shell 10 and various devices on the circuit board 30, such as the common mode integrated inductor 40, the capacitors 50 and the pins 20, can be better fixed into a whole, the vibration resistance, the shock resistance, the sealing and the salt spray resistance can be improved, and the environmental adaptation reliability of the product can be enhanced.
Further, referring to fig. 1 and 2, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the potting adhesive 60 includes a first adhesive 61 disposed between the bottom surface of the accommodating cavity 11 and the circuit board 30, and a second adhesive 62 disposed on the top surface of the circuit board 30. The structure is more convenient to manufacture. If the first colloid 61 is injected into the bottom of the accommodating cavity 11 during processing and manufacturing, then the circuit board 30 is installed in the accommodating cavity 11, so that the first colloid 61 is solidified to fix the circuit board 30, and the structure can better fix the circuit board 30 and various devices during assembly; after the first colloid 61 is solidified, the second colloid 62 is refilled, so that the influence on the circuit board 30 and various devices during encapsulation is reduced, and the quality is better ensured.
Further, the pouring sealant 60 can be filled with an A/B sealant, so that the vibration resistance and the shock resistance of the manufactured dual-output direct-current power supply EMI filter are improved.
Further, the casing 10 is a metal casing made of 10# steel and having a nickel plated surface and gold plated on each lead 20, and is packaged by parallel seam welding, so as to improve the environmental adaptability such as sealing, moisture resistance, salt spray resistance, etc.
Further, referring to fig. 7 to 13 together, as a specific embodiment of the two-way output dc EMI filter provided by the present invention, fig. 7 is a schematic structural diagram of a top signal layer of the circuit board 30, and as can be seen from the figure, the top layer of the circuit board 30 includes six top signal lines 331 and one top middle signal line 332, the top middle signal line 332 is disposed along the width direction of the circuit board 30, the top middle signal line 332 is located in a middle area of the circuit board 30 along the length direction, the six top signal lines 331 are divided into two groups, and the two groups of top signal lines 331 are symmetrically disposed at two sides of the top middle signal line 332. Fig. 8 is a schematic diagram of the structure of the top pad layer of the circuit board 30, where eight top-side print pads 341 for forming connection to four differential-mode capacitors 51 and twelve top-middle print pads 342 for forming connection to six common-mode capacitors 52 are disposed on the circuit board 30. Fig. 9 is a schematic diagram of a top soldering flux layer of a circuit board 30, in which eight top end soldering flux pads 351 for conveniently connecting to a differential capacitor 51, twelve top middle soldering flux pads 352 for conveniently connecting to a common capacitor 52, two top side soldering flux pads 354 for conveniently fixing the circuit board 30, and six top foot soldering flux pads 353 for conveniently electrically connecting to each of the pins 20 are provided on the top layer of the circuit board 30, the six top foot soldering flux pads 353 correspond to the positions of the six pins 20, the two top side soldering flux pads 354 are respectively located on two sides of the length direction of the circuit board 30, and the two top side soldering flux pads 354 are respectively located in the middle area of the length direction of the circuit board 30, so as to conveniently fix the circuit board 30 in the housing 10. Fig. 10 is a schematic structural diagram of a top screen printing layer of the circuit board 30, so that a top screen printing line 361 is formed on the top surface of the circuit board 30 to perform a prompting function, thereby facilitating connection of devices.
Fig. 11 is a schematic structural diagram of a bottom signal layer of the circuit board 30, in which the bottom layer of the circuit board 30 includes six bottom signal lines 333 and one bottom middle signal line 334, the bottom middle signal line 334 is disposed along the width direction of the circuit board 30, and the bottom middle signal line 334 is located in a middle area of the circuit board 30 along the length direction, the six bottom signal lines 333 are divided into two groups, and the two groups of bottom signal lines 333 are symmetrically disposed at two sides of the bottom middle signal line 334. Fig. 12 is a schematic structural diagram of a bottom soldering flux layer of a circuit board 30, where two bottom side soldering flux pads 355 for fixing the circuit board 30 and six bottom foot soldering flux pads 356 for electrically connecting the pins 20 are disposed on the bottom layer of the circuit board 30, the six bottom foot soldering flux pads 356 correspond to the six pins 20, the two bottom side soldering flux pads 355 are located on two sides of the circuit board 30 in the length direction, and the two bottom side soldering flux pads 355 are located in the middle region of the circuit board 30 in the length direction, so as to fix the circuit board 30 in the housing 10. Fig. 13 is a schematic structural diagram of a bottom silk-screen layer of the circuit board 30, so that a bottom silk-screen line 362 is formed on the top surface of the circuit board 30 to perform a prompting function, so as to facilitate connection of devices.
Further, referring to fig. 1 to 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, the two-way output dc power EMI filter further includes magnetic beads (not shown in the drawings), each magnetic bead is provided with a through hole, each pin 20 is respectively sleeved with a magnetic bead, the magnetic beads are used for suppressing high frequency noise and peak interference on a signal line or a power line, and each magnetic bead is disposed between the circuit board 30 and the bottom surface of the accommodating cavity 11; therefore, the high-frequency noise and peak interference can be restrained by the magnetic beads before the current enters the circuit board 30 from the pin 20 for filtering, and the high-frequency noise and peak interference can be restrained by the magnetic beads before the current is output from the circuit board 30 after the current is filtered through the pin 20, so that the high-frequency noise and peak interference on a signal line or a power line can be restrained and filtered better, and the filtering effect can be improved. In addition, through holes (not shown) are formed in the magnetic beads, the magnetic beads are sleeved on the corresponding pins 20, the installation and the fixation are convenient, and a plurality of magnetic beads are arranged, so that the effect of suppressing and filtering high-frequency noise and peak interference on a signal line or a power line can be improved, meanwhile, the structure can also reduce the volume, facilitate the layout of the magnetic beads, and improve the installation reliability of electronic devices on the circuit board 30.
Further, referring to fig. 1 to 6, as a specific embodiment of the two-way output dc power EMI filter provided by the present invention, each magnetic bead is in a ring shape, so as to reduce the edges and corners, so as to better suppress and filter the high-frequency noise and peak interference on the signal line or the power line.
The manufactured dual-output direct-current power supply EMI filter can adopt a passive LC device, adopts a capacitor 50 with small parasitic parameters and good electromagnetic characteristics at very high frequency (namely, adopts the capacitor 50 with small volume, small parasitic parameters and high-frequency electromagnetic characteristics), and is mounted on the circuit board 30 in a surface-mounted manner so as to realize miniaturization and integration and ensure good electromagnetic compatibility.
Similarly, the two-way output direct current power supply EMI filter manufactured by the invention can adopt a passive LC device, adopts a resistor with small parasitic parameters and can provide good electromagnetic characteristics at very high frequency (namely, adopts a resistor with small volume, small parasitic parameters and high frequency electromagnetic characteristics), and is mounted on the circuit board 30 in a surface-mounted manner so as to realize miniaturization and integration and ensure good electromagnetic compatibility.
Further, the common mode insertion loss test curve of the two-way output direct current power supply EMI filter of the present invention under the load impedance 50Ω standard is shown in FIG. 14, and the differential mode insertion loss test curve is shown in FIG. 15. In fig. 14, the abscissa is frequency (Hz), the ordinate is decibel (dB), and the line a represents the insertion loss; in fig. 15, the abscissa is frequency (Hz), the ordinate is decibel (dB), and the line b represents the insertion loss; as can be seen from fig. 14 and 15, the EMI filter of the dual output dc power supply of the present invention has good filtering performance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The utility model provides a double-circuit output DC power supply EMI wave filter, including the casing that has the holding chamber, install in circuit board in the holding chamber, with six pins that circuit board electricity links to each other, each one end of pin stretches into in the holding chamber with the circuit board links to each other, each the other end of pin stretches out through the bottom surface in holding chamber the casing, the bottom of casing has been seted up corresponding confession the trompil that the pin stretches out, its characterized in that: the dual-output direct-current power supply EMI filter further comprises a common-mode integrated inductor integrating three windings, a capacitor and a resistor, wherein the capacitor and the resistor are matched with the common-mode integrated inductor to perform filtering, a circuit for connecting the common-mode integrated inductor, the capacitor and the resistor to form a dual-path power supply filtering circuit is arranged in the circuit board, the common-mode integrated inductor is parasitic inductance, the capacitor is parasitic capacitance, and the resistor is parasitic resistance; the six pins comprise three input pins which are respectively and electrically connected with one end of each strand of the winding wire and three output pins which are respectively and electrically connected with the other end of each strand of the winding wire;
the common mode integrated inductor further comprises a ferrite bead, wherein three strands of winding wires are wound on the ferrite bead, and the three strands of winding wires are respectively wound on three areas of the ferrite bead in the circumferential direction; an isolating ring is arranged between two adjacent windings on the ferrite magnetic ring, and the isolating ring is sleeved on the ferrite magnetic ring; the three windings comprise two single wires and one double wire, and the double wire comprises two wires wound on the ferrite magnetic ring side by side; three of the input pins: one input pin forms a common input pin, and the other two input pins respectively form two single-way input pins; three of the output pins: one output pin forms a public output pin, and the other two output pins respectively form two single-way output pins; and two ends of the double-wire are respectively and electrically connected with the public input pin and the public output pin.
2. The dual output dc power EMI filter of claim 1, wherein: each capacitor is a surface-mounted parasitic capacitor with high-frequency electromagnetic characteristics, and the capacitor is mounted on the circuit board.
3. The dual output dc power EMI filter of claim 2, wherein: the capacitors comprise four differential mode capacitors and six common mode capacitors, the six common mode capacitors are arranged in two rows along the width direction of the circuit board, the six common mode capacitors are arranged in the middle area of the circuit board in a rectangular array, the four differential mode capacitors are arranged in two rows along the width direction of the circuit board, and the two rows of differential mode capacitors are respectively arranged at two ends of the length direction of the circuit board.
4. A two-way output dc power EMI filter as set forth in claim 3 wherein: the length direction of each common mode capacitor is parallel to the length direction of the circuit board, and the length direction of each differential mode capacitor is perpendicular to the length direction of the circuit board.
5. A two-way output dc power EMI filter as set forth in claim 3 wherein: the capacitors are arranged on the top surface of the circuit board, and the common mode integrated inductor is arranged on the bottom surface of the circuit board.
6. The dual output dc power EMI filter of claim 5, wherein: the common mode integrated inductor is arranged in the middle area of the circuit board.
7. The dual output dc power EMI filter of claim 1, wherein: three input pins are arranged in a row along the width direction of the shell, three input pins are arranged at one end of the length direction of the shell, and three input pins are arranged in the following parts: the input pins positioned in the middle form the public input pins, and the two input pins positioned at the two ends respectively form the two single-way input pins; the three output pins are arranged in a row along the width direction of the shell, the three output pins are arranged at the other end of the length direction of the shell, and the three output pins are arranged in the following parts: the output pins positioned in the middle form the public output pins, and the two output pins positioned at the two ends respectively form two single-way output pins; one single-way input pin and one single-way output pin on one side of the length direction of the shell are respectively and electrically connected with two ends of one single wire, and one single-way input pin and one single-way output pin on the other side of the length direction of the shell are respectively and electrically connected with two ends of the other single wire.
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| CN201810797608.XA CN108768159B (en) | 2018-07-19 | 2018-07-19 | Dual-output direct-current power supply EMI filter |
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| CN201810797608.XA CN108768159B (en) | 2018-07-19 | 2018-07-19 | Dual-output direct-current power supply EMI filter |
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| CN108768159B true CN108768159B (en) | 2024-05-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| CN108768159A (en) | 2018-11-06 |
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