CN108599552B - Electromagnetic interference filtering module - Google Patents
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- CN108599552B CN108599552B CN201810456851.5A CN201810456851A CN108599552B CN 108599552 B CN108599552 B CN 108599552B CN 201810456851 A CN201810456851 A CN 201810456851A CN 108599552 B CN108599552 B CN 108599552B
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- 239000003990 capacitor Substances 0.000 claims abstract description 190
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- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 238000004382 potting Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 241000270728 Alligator Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
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Abstract
The invention provides an electromagnetic interference filtering module and relates to the field of electricity. According to the embodiment of the invention, the first capacitor group and the second capacitor group are symmetrically arranged, so that when the interference problem is solved, the capacitors in the first capacitor group and the corresponding capacitors in the second capacitor group are connected between the first connecting piece and the second connecting piece by controlling the grounded switch element to be in a connected state or a disconnected state, and therefore, different capacitors and capacitor groups can be conveniently switched, and the filtering scheme and effect can be conveniently and quickly verified.
Description
Technical Field
The invention relates to the electrical field, in particular to an electromagnetic interference filtering module.
Background
The electric automobile integrates high-voltage components such as a motor, a motor controller, a compressor, a DC/DC, a vehicle-mounted charger and the like, and the problem that the high-voltage, large-current or high-frequency devices interfere with each other or interfere with low-voltage devices frequently occurs. There are two main interference modes: firstly, the common high-voltage wire harness is mutually transmitted among high-voltage devices, so that electromagnetic interference is caused to weak links; meanwhile, a high-voltage, large-current and high-frequency system can also be coupled, for example, parasitic capacitance exists between a motor and a frame or between an IGBT and a radiator, and the generated common-mode interference can be conducted to a vehicle body through the parasitic capacitance, so that the common-mode interference reaches a negative pole of low-voltage 12V direct current and finally influences a low-voltage system.
In order to solve the problems, a filter device needs to be temporarily added on the whole vehicle on site, but the scheme is verified and determined, an engineer needs to continuously disassemble, assemble, replace the filter component and adjust the parameters of the filter device, the repeated and heavy work wastes time, meanwhile, certain potential safety hazards are caused in the repeated disassembling and assembling of the vehicle-mounted component, and the optimization efficiency and the safety degree are lower.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an electromagnetic interference filtering module for conveniently and quickly selecting a filtering scheme.
In order to solve the above technical problem, an embodiment of the present invention provides an electromagnetic interference filtering module, including:
a housing, inside which an accommodating cavity is arranged;
the capacitor comprises a first capacitor group and a second capacitor group which are symmetrically arranged, wherein the first capacitor group and the second capacitor group respectively comprise a first number of capacitors, the capacitance values of the capacitors in the second capacitor group are equal to the capacitance values of the capacitors in the first capacitor group in a one-to-one correspondence manner, and a second pin of each capacitor in the first capacitor group is connected with a first pin of the capacitor with the same capacitance value in the second capacitor group through a switch element;
the first pin of each capacitor in the first capacitor group is connected with the first connecting piece through a connecting line;
the second pin of each capacitor in the second capacitor group is connected with the second connecting piece through a connecting wire;
wherein each of the switching elements is grounded, each of the switching elements including: a connected state and a disconnected state.
Further, the electromagnetic interference filtering module further includes:
the third connecting piece is arranged outside the shell and used for grounding, each switch element is connected with the third connecting piece through a connecting wire, and each switch element is grounded through the third connecting piece;
when the switch element is in a connected state, the two capacitors connected with the switch element are both in a connected state with the third connecting piece, and when the switch element is in a disconnected state, the two capacitors connected with the switch element are both in a disconnected state with the third connecting piece.
Further, each of the switching elements includes: a first electrode for connection to a capacitor in the first capacitor bank, a second electrode for connection to a capacitor in the second capacitor bank, and a third electrode connected to ground;
wherein in the off state, the first electrode, the second electrode and the third electrode are not communicated with each other, and in the on state, the third electrode is communicated with the first electrode and the second electrode respectively.
Further, the switch element is a double-row six-pin button switch.
Further, the electromagnetic interference filtering module further includes: and each capacitor is arranged on the printed circuit board.
Further, the printed circuit board includes: the first connecting end, the second connecting end with the same number as the capacitors in the first capacitor group, and the third connecting end and the fourth connecting end with the same number as the capacitors in the second capacitor group;
the first pin of each capacitor in the first capacitor group is connected with the first connecting end, the first connecting end is connected with the first connecting piece through a connecting line, and the second pin of each capacitor in the first capacitor group is connected with the second connecting end;
the second pin of each capacitor in the second capacitor group is connected with the fourth connecting end, the fourth connecting end is connected with the second connecting piece through a connecting wire, and the first pin of each capacitor in the second capacitor group is connected with the third connecting end;
the first pin of each switch element is connected with one second connecting end, and the second pin of each switch element is connected with one third connecting end.
Furthermore, the capacitance values of each capacitor in the first capacitor bank are different from each other, and the capacitance value of each capacitor is between 10uF and 500 uF.
Furthermore, the length of the connecting line connected with the first connecting piece and the length of the connecting line connected with the second connecting piece are both smaller than or equal to 100 mm.
Further, the housing includes:
the body is hollow to form the accommodating cavity, and filling materials are filled in the accommodating cavity;
and the fixing plate is fixedly connected with the body, and at least one mounting hole for fixing the shell is formed in the fixing plate.
Further, the electromagnetic interference filtering module further includes: and the controller is respectively connected with each switch element and is used for controlling each switch element to switch between the connection state and the disconnection state.
Compared with the prior art, the electromagnetic interference filtering module provided by the embodiment of the invention at least has the following beneficial effects:
according to the embodiment of the invention, the first capacitor group and the second capacitor group are symmetrically arranged, so that when the interference problem is solved, the capacitors in the first capacitor group and the corresponding capacitors in the second capacitor group are connected between the first connecting piece and the second connecting piece by controlling the grounded switch element to be in a connected state or a disconnected state, and therefore, different capacitors and capacitor groups can be conveniently switched, and the filtering scheme and effect can be conveniently and quickly verified.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic interference filtering module according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a capacitor bank mounted on a printed circuit board according to an embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of an EMI filtering module according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a switching element according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a switching element according to another embodiment of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
Referring to fig. 1, an embodiment of the present invention provides an electromagnetic interference filtering module, including:
the shell 1 is internally provided with an accommodating cavity;
the capacitor bank comprises a first capacitor bank 2 and a second capacitor bank 3 which are symmetrically arranged, wherein the first capacitor bank 2 and the second capacitor bank 3 respectively comprise a first number of capacitors, the capacitance values of the capacitors in the second capacitor bank 3 are equal to the capacitance values of the capacitors in the first capacitor bank 2 in a one-to-one correspondence manner, and a second pin of each capacitor in the first capacitor bank 2 is connected with a first pin of a capacitor with the same capacitance value in the second capacitor bank 3 through a switch element;
the first pin of each capacitor in the first capacitor group 2 is connected with the first connecting piece 4 through a connecting line;
the second pin of each capacitor in the second capacitor group 3 is connected with the second connecting piece 5 through a connecting wire;
wherein each of the switching elements 6 is grounded, and each of the switching elements 6 includes: a connected state and a disconnected state.
It can be understood that the symmetry in the first capacitor group 2 and the second capacitor group 3 symmetrically arranged in the above description does not mean that the two capacitor groups are spatially symmetrical, but means that the number of capacitors in the first capacitor group 2 is equal to the number of capacitors in the second capacitor group 3, and the capacitance values of the capacitors corresponding to each other are also equal, so that the parameters of the two capacitors connected one by one after connection are equal, and the symmetry in connection is realized.
According to the embodiment of the invention, the first capacitor group 2 and the second capacitor group 3 are symmetrically arranged, so that when the interference problem is solved, the capacitors in the first capacitor group 2 and the corresponding capacitors in the second capacitor group 3 are connected between the first connecting piece 4 and the second connecting piece 5 by controlling the grounded switch elements 6 to be in a connected state or a disconnected state, and are grounded through the corresponding switch elements 6, the filtering effect of the Y capacitor is realized, different capacitors and capacitor groups are switched by controlling different switch elements 6, and the filtering scheme and effect can be conveniently and quickly verified.
Referring to fig. 3, it can be understood that two capacitor banks are symmetrical Y capacitor banks connected between V +, V-and ground, parameters of the capacitors correspondingly connected in the two capacitor banks are the same, and the two capacitor banks are packaged as an integral module, in fig. 3, to better represent the concept of the symmetrical capacitor banks, switches S1-S6 are respectively drawn in the two capacitor banks, and in an actual module, the two symmetrical capacitor banks can share one switch element 6, so that synchronous switching of the two Y capacitor banks is realized.
Referring to fig. 1, it is preferable that the switching element 6 is such that an operating lever for controlling the switching between the on state and the off state of the switching element 6 is exposed to the housing 1, and a pin for connection to the switching element 6 is provided inside the housing 1, so that the switching element 6 can be grounded through the housing 1. In an embodiment of the present invention, in order to determine grounding in response to different test environments, in this embodiment, the electromagnetic interference filtering module may further include:
a third connecting member 7 disposed outside the housing 1 for grounding, each of the switch elements 6 being connected to the third connecting member 7 by a connecting wire, each of the switch elements 6 being grounded by the third connecting member 7;
wherein both the capacitors connected to the switching element 6 are in a connected state with the third connection 7 when the switching element 6 is in a connected state, and both the capacitors connected to the switching element 6 are in a disconnected state with the third connection 7 when the switching element 6 is in a disconnected state.
Through the third connecting piece 7, the switch elements 6 can be grounded through the third connecting piece 7 under different test environments, and therefore the smooth proceeding of the test is determined.
Referring to fig. 4, for the switching elements 6 in the above description, in an embodiment of the present invention, each of the switching elements 6 includes: a first electrode 61 for connection to the capacitors in the first capacitor bank 2, a second electrode 62 for connection to the capacitors in the second capacitor bank 3 and a third electrode 63 connected to ground;
wherein in the off state, the first electrode 61, the second electrode 62 and the third electrode 63 are not communicated with each other, and in the on state, the third electrode 63 is communicated with the first electrode 61 and the second electrode 62 respectively, and at this time, the first electrode 61 and the second electrode 62 can be grounded through the third electrode 63.
In the off state, the third electrode 63 and the first and second electrodes 61 and 62 are separated from each other, so that the capacitors in the first capacitor bank 2 connected to the first electrode 61 and the capacitors in the second capacitor bank 3 connected to the second electrode 62 are both in the off state with the third electrode 63, and thus, the capacitors are both not grounded when the switching element 6 is in the off state.
Referring to fig. 5, in another embodiment of the present invention, the switch element 6 is a two-row six-pin button switch. The two pins e and f are respectively connected with a capacitor, the pins c and d are grounded through connecting wires, when the capacitor is in a disconnected state, the movable terminal 64 connected with the pins e and f can be in contact with the pins a and b, and when the capacitor is in a connected state, the movable terminal 64 connected with the pins e and f can be in contact with the pins e and f, so that the two capacitors are grounded.
It is understood that, for the switching element 6, not limited to the two embodiments provided above, other arrangements are possible as long as it can be achieved that both the capacitors connected to the switching element 6 are in a connected state with the third connector 7 when the switching element 6 is in a connected state, and both the capacitors connected to the switching element 6 are in a disconnected state with the third connector 7 when the switching element 6 is in a disconnected state.
Referring to fig. 2, the emi filtering module may further include: and the printed circuit board 8 is provided with each capacitor. The capacitor can be fixedly connected with the printed circuit board in a welding mode.
For the printed circuit board, at least one fixing hole can be arranged on the printed circuit board and used for fixedly connecting the printed circuit board and the shell 1, so that the internal components can be protected from impacting the inner wall of the shell 1 under different test environments. For example, as shown in fig. 1, fixing holes are reserved at four corners of the printed circuit board.
With continued reference to fig. 2, the printed circuit board includes: a first connection end 81, a second connection end 82 with the same number of capacitors in the first capacitor group 2, a third connection end 83 and a fourth connection end 84 with the same number of capacitors in the second capacitor group 3;
a first pin of each capacitor in the first capacitor group 2 is connected with the first connection end 81, the first connection end 81 is connected with the first connection member 4 through a connection line, and a second pin of each capacitor in the first capacitor group 2 is connected with the second connection end;
the second pin of each capacitor in the second capacitor group 3 is connected to the fourth connection end 84, the fourth connection end 84 is connected to the second connection member 5 through a connection line, and the first pin of each capacitor in the second capacitor group 3 is connected to the third connection end 83;
the first pin of each of the switching elements 6 is connected to one of the second connection terminals, and the second pin of each of the switching elements 6 is connected to one of the third connection terminals 83.
Referring to fig. 3, in order to test more combined capacitance values, in the embodiment of the invention, the capacitance values of each of the capacitors in the first capacitor bank 2 are different from each other, and the capacitance value of each of the capacitors is between 10uF and 500 uF.
FIG. 3 shows an electrical schematic diagram, wherein V + and V-are the positive and negative electrodes of the high voltage harness of the electric vehicle, respectively; the input side is defined here as the battery pack side or the side of the interference source in the high-voltage installation; the output side is defined as the high voltage sensitive device side. The module is used as a parallel device between an interference source and a sensitive source to carry out bypass filtering on interference signals. C1, C2 … … Cn is common mode capacitance (Y capacitance); and S1 and S2 … … Sn are control switches corresponding to each common mode capacitor bank. The common-mode capacitor used in the method meets the safety requirements of vehicles, such as rated voltage, withstand voltage, insulation grade and the like, and the thin-film safety capacitor is recommended to be used as the material.
Since the common mode interference frequency is high and the common mode interference frequency is used as a parallel device between the anode and the cathode and the vehicle body, the common mode interference frequency has direct influence on leakage current and safety, and the capacitance value is generally limited to nF level. The present invention provides an alternative embodiment for capacitor storage, for example, where C11-Cn 1 corresponds to C21-C2 n, such as C11-20 nF, C12-50 nF, C13-100 nF, C14-200 nF, C15-300 nF, and C16-400 nF … ….
As shown in fig. 2, S1-Sn can be selectively turned on to obtain different capacitance values of the differential-mode capacitor bank, thereby providing different interference suppression effects. Since the capacitor is made of non-polar material, the difference between V + and V-can be ignored in practical use.
Referring to fig. 1, the housing 1 may include: the body is hollow to form the accommodating cavity, and filling materials are filled in the accommodating cavity; and the fixing plate is fixedly connected with the body, and at least one mounting hole 9 for fixing the shell 1 is formed in the fixing plate.
The length of the connecting line connected with the first connecting piece 4 and the length of the connecting line connected with the second connecting piece 5 are both smaller than or equal to 100 mm.
Filling potting material in the holding intracavity can effectively protect inside utensil, guarantee to carry out simple fixed assurance test safety in the driving test, can choose epoxy class or silica gel class potting material for use to the potting material. In order to facilitate field debugging and safe use, the shell 1 can be made of plastic. The installation holes 9 are convenient for fixing the shell 1 conveniently and quickly when temporary fixing is needed.
Wherein, for the connecting wires connected with the first connecting piece 4 and the second connecting piece 5, the wires are preferably not less than 12AWG, and the length of the connecting wires is preferably less than or equal to 100mm, so as to ensure the filtering effect of high-frequency interference.
Referring to fig. 1, first link 4, second link 5, and third link 7 may be alligator clips to facilitate field wiring. Of course, the first connecting member 4, the second connecting member 5 and the third connecting member 7 may also be cold-pressed terminals for switching, which are commonly called OT.
The switch element 6 may also be electrically controlled, and in another embodiment of the present invention, the emi filtering module further includes: a controller, connected to each of the switching elements 6, for controlling each of the switching elements 6 to switch between the on state and the off state. The control instruction can be sent to the controller by arranging the operation panel electrically connected with the controller in the accommodating cavity on the outer surface of the shell, and the wireless communication module electrically connected with the controller can be arranged in the accommodating cavity, so that a tester can send the control instruction to the controller through a control device or a mobile terminal wirelessly connected with the wireless communication module.
To sum up, in the embodiment of the present invention, the first capacitor bank 2 and the second capacitor bank 3 are symmetrically disposed, so that when the interference problem is solved, the grounded switch element 6 is controlled to be in a connected state or a disconnected state, and the capacitors in the first capacitor bank 2 and the corresponding capacitors in the second capacitor bank 3 are connected between the first connecting member 4 and the second connecting member 5, thereby facilitating switching between different capacitors and capacitor banks and conveniently and quickly verifying the filtering scheme and effect.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An electromagnetic interference filtering module, comprising:
a housing, inside which an accommodating cavity is arranged;
the capacitor comprises a first capacitor group and a second capacitor group which are symmetrically arranged, wherein the first capacitor group and the second capacitor group respectively comprise a first number of capacitors, the capacitance values of the capacitors in the second capacitor group are equal to the capacitance values of the capacitors in the first capacitor group in a one-to-one correspondence manner, and a second pin of each capacitor in the first capacitor group is connected with a first pin of the capacitor with the same capacitance value in the second capacitor group through a switch element;
the first pin of each capacitor in the first capacitor group is connected with the first connecting piece through a connecting line;
the second pin of each capacitor in the second capacitor group is connected with the second connecting piece through a connecting wire;
wherein each of the switching elements is grounded, each of the switching elements including: a connected state and a disconnected state;
each of the switching elements includes: a first electrode for connection to a capacitor in the first capacitor bank, a second electrode for connection to a capacitor in the second capacitor bank, and a third electrode connected to ground;
wherein in the off state, the first electrode, the second electrode and the third electrode are not communicated with each other, and in the on state, the third electrode is communicated with the first electrode and the second electrode respectively.
2. The EMI filtering module of claim 1, further comprising:
the third connecting piece is arranged outside the shell and used for grounding, each switch element is connected with the third connecting piece through a connecting wire, and each switch element is grounded through the third connecting piece;
when the switch element is in a connected state, the two capacitors connected with the switch element are both in a connected state with the third connecting piece, and when the switch element is in a disconnected state, the two capacitors connected with the switch element are both in a disconnected state with the third connecting piece.
3. The EMI filtering module of claim 1, wherein said switch element is a two-row six-pin button switch.
4. The EMI filtering module of claim 1, further comprising: and each capacitor is arranged on the printed circuit board.
5. The EMI filtering module of claim 4, wherein said printed circuit board includes: the first connecting end, the second connecting end with the same number as the capacitors in the first capacitor group, and the third connecting end and the fourth connecting end with the same number as the capacitors in the second capacitor group;
the first pin of each capacitor in the first capacitor group is connected with the first connecting end, the first connecting end is connected with the first connecting piece through a connecting line, and the second pin of each capacitor in the first capacitor group is connected with the second connecting end;
the second pin of each capacitor in the second capacitor group is connected with the fourth connecting end, the fourth connecting end is connected with the second connecting piece through a connecting wire, and the first pin of each capacitor in the second capacitor group is connected with the third connecting end;
the first pin of each switch element is connected with one second connecting end, and the second pin of each switch element is connected with one third connecting end.
6. The EMI filtering module as claimed in claim 1, wherein each of the capacitors in the first capacitor set has a capacitance value different from each other, and the capacitance value of each of the capacitors is between 10uF and 500 uF.
7. The EMI filtering module of claim 1, wherein the length of each of the connecting wires connected to the first connector and the connecting wires connected to the second connector is less than or equal to 100 mm.
8. The EMI filtering module of claim 1, wherein said housing includes:
the body is hollow to form the accommodating cavity, and filling materials are filled in the accommodating cavity;
and the fixing plate is fixedly connected with the body, and at least one mounting hole for fixing the shell is formed in the fixing plate.
9. The EMI filtering module of claim 1, further comprising:
and the controller is respectively connected with each switch element and is used for controlling each switch element to switch between the connection state and the disconnection state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810456851.5A CN108599552B (en) | 2018-05-14 | 2018-05-14 | Electromagnetic interference filtering module |
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| CN201810456851.5A CN108599552B (en) | 2018-05-14 | 2018-05-14 | Electromagnetic interference filtering module |
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| CN108599552B true CN108599552B (en) | 2020-03-31 |
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| CN102522755A (en) * | 2011-12-14 | 2012-06-27 | 上海信元瑞电气有限公司 | Household-type voltage-reduction energy-saving device |
| CN103197349B (en) * | 2013-02-28 | 2016-05-18 | 湖南科技大学 | A kind of transmitter output square wave front and back are along adjusting device and method |
| CN105182117B (en) * | 2015-08-27 | 2018-05-11 | 广西电网有限责任公司电力科学研究院 | A kind of direct current comprehensive test platform |
| DE102015226177A1 (en) * | 2015-12-21 | 2017-06-22 | Robert Bosch Gmbh | Suppressor, electronic assembly and use of a suppression device |
| CN205847081U (en) * | 2016-06-22 | 2016-12-28 | 宝鸡市瑞通电器有限公司 | A kind of electromagnetic interface filter filtering 50KHz electromagnetic interference |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
| CN107370362A (en) * | 2017-08-28 | 2017-11-21 | 重庆大及电子科技有限公司 | A kind of controllable output filter of multichannel |
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