CN207410309U - A kind of filtering unit - Google Patents

A kind of filtering unit Download PDF

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Publication number
CN207410309U
CN207410309U CN201720676339.2U CN201720676339U CN207410309U CN 207410309 U CN207410309 U CN 207410309U CN 201720676339 U CN201720676339 U CN 201720676339U CN 207410309 U CN207410309 U CN 207410309U
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China
Prior art keywords
filter circuit
housing
capacitance
chamber
mode inductance
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CN201720676339.2U
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Chinese (zh)
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鲁立国
张雄飞
杜秋平
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Ben Chengdu Electronic Technology Co Ltd
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Ben Chengdu Electronic Technology Co Ltd
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Abstract

The utility model discloses a kind of filtering unit, belongs to wave filter technology field, including signal filter circuit (1), electric source filter circuit (2), housing (3), cover board (4);The housing (3) includes at least two chambers, and the signal filter circuit (1) and electric source filter circuit (2) are located in described two chambers respectively;The side wall that the input terminal lead (11) and output terminal lead (12) of the signal filter circuit (1) both pass through the housing (3) extends to the outsides of housing (3);The side wall that the input terminal lead (21) and output terminal lead (22) of the electric source filter circuit (2) both pass through the housing (3) extends to the outsides of housing (3);The cover board (4) is adapted to the housing (3).Filtering unit provided by the utility model, integrated level are high, and small, signal shielding effect is good, the problem of can efficiently solving electromagnetic compatibility in electronic equipment.

Description

A kind of filtering unit
Technical field
The utility model belongs to wave filter technology field more particularly to a kind of filtering unit.
Background technology
In recent years, with the increasingly complexity of electronic equipment, particularly analog circuit and the situation of digital circuit mixing day by day Increase, the working frequency of circuit is more and more high, and the interference resulted between circuit is more serious, in order to ensure that electronic equipment is stablized It reliably works, reduces electromagnetic pollution, meet EMC Requirements, wave filter obtains widely should in electronic equipment of various With.
Power-supply filter is a kind of passive bidirectional network, its one end is power supply, and the other end is load.Its principle is exactly one Kind impedance network:Power-supply filter input, outlet side and the impedance of power supply and load-side are bigger, to electromagnetic interference Attenuation is more effective.Power-supply filter can carry out the frequency beyond the frequency point or the frequency point of specific frequency in power cord effective It filters out, obtains the power supply signal after one specific frequency of power supply signal or elimination of a specific frequency.
Power-supply filter is the passive low pass network being made of inductance, capacitance and common mode inductance element, it allow direct current or 50Hz exchanges pass through, and the interference signal higher to frequency then has larger attenuation, since interference signal has two kinds of differential mode and common mode, Therefore power-supply filter will all have attenuation to both interference.Power line filter is two-way, when it is installed in After in system, the interference signal that can effectively inhibit electronic device exterior is passed to equipment, and equipment is made to meet conducted susceptibility It is required that;The harassing and wrecking signal for being transmitted to power grid generated when equipment works in itself can be greatly attenuated again, and equipment is made to meet conducted emission It is required that.
Power-supply filter is mainly used in the filtering process on power cord, and present electronic equipment except supply line with Outside, also there are substantial amounts of network interface, rs 232 serial interface signal circuits.Signal transmission frequencies in these circuits make at several megahertzs or more These signals can be caused to decay with power-supply filter, influence the transmission of signal, therefore be not suitable for installation power supply on these circuits Wave filter is applied, it is necessary to design individual wave filter in these circuits.
In the prior art, the side for separately designing respective filter is used to the filtering process of power cord and signal wire Method.Power cord and signal wire are filtered using current technology, can design two or more wave filters with Meet the requirement of electronic equipment, so not only result in the trouble of installation process, and a large amount of of electronic device space can be caused Waste.And the use of multiple wave filters, it is impossible to effectively be isolated to input signal and output signal, made in input line Electromagnetic interference cannot not only meet electronic equipment by the way that the filter effect of wave filter on Space Coupling to output line, is caused to be deteriorated The filtering requirements of power cord and signal wire can also bring the interference in electronic equipment into the external world, influence other equipment, cause electronics Equipment cannot meet the requirement of Electro Magnetic Compatibility.
Utility model content
The utility model is intended to provide a kind of filtering unit, and the filtering unit integrated level is high, small, signal shielding effect Well, the problem of electromagnetic compatibility in electronic equipment being efficiently solved.
In order to achieve the above objectives, the technical solution adopted in the utility model is as follows:
A kind of filtering unit disclosed in the utility model, including signal filter circuit, electric source filter circuit, housing, cover board; The housing includes at least two chambers, and the signal filter circuit and electric source filter circuit are located at described two chambers respectively In;The side wall that the input terminal lead and output terminal lead of the signal filter circuit both pass through the housing extends to the outer of housing Portion;The side wall that the input terminal lead and output terminal lead of the electric source filter circuit both pass through the housing extends to the outer of housing Portion;The cover board and the casing adaptor.
Preferably, partition is respectively equipped on the horizontal direction of the housing and vertical direction, the partition separates housing For three chambers;Three chambers are respectively the first chamber positioned at housing upper left quarter, positioned at the second chamber of housing lower left quarter Room, positioned at the 3rd chamber of housing right part;The signal filter circuit is located in the second chamber, the electric source filter circuit In the 3rd chamber.
Preferably, the signal filter circuit is integrated on signal filter circuit plate, and the signal filter circuit plate passes through Cross Recess Head Screw is fixed in the second chamber.
Preferably, coating organic silica gel on the signal filter circuit plate, the 3rd chamber use heat-conducting organic silica gel Embedding.
Preferably, the partition is made into integration with housing.
Further, the lower madial wall in the second chamber, the left inside side wall of second chamber, the lower inside of the 3rd chamber Wall, first chamber left inside side wall on respectively fix insulating sheath, the input terminal lead and output terminal of the signal filter circuit Lead, the input terminal lead of the electric source filter circuit and output terminal lead are pierced by respectively by the insulating sheath, are extended to The outside of housing.
Further, electric source filter circuit includes the first electric source filter circuit and/or second source filter circuit.
Preferably, first electric source filter circuit includes the first common mode inductance, the second common mode inductance, the first differential mode electricity Sense, the second differential mode inductance, the first feedthrough capacitor, the second feedthrough capacitor;First common mode inductance includes the first inductance and second Inductance, second common mode inductance include the 3rd inductance and the 4th inductance;The input terminal connection of first electric source filter circuit The input terminal of first common mode inductance, the output terminal of first common mode inductance connect the input of second common mode inductance End;3rd inductance is connected to the output head anode of the first electric source filter circuit by first differential mode inductance, and described Four inductance are connected to the negative pole of output end of the first electric source filter circuit by second differential mode inductance;First common mode inductance Input terminal between bridging have the first capacitance, between the output terminal of first common mode inductance bridging have the second capacitance;Described The both ends of two capacitances pass through the 3rd capacitance and the 4th capacity earth respectively;Being bridged between the output terminal of second common mode inductance has 5th capacitance, the both ends of the 5th capacitance pass through the 6th capacitance and the 7th capacity earth respectively;First differential mode inductance and The output terminal of second differential mode inductance is grounded respectively by first feedthrough capacitor and the second feedthrough capacitor;First capacitance is Differential mode capacitor, the 3rd capacitance, the 4th capacitance, the 6th capacitance, the 7th capacitance are common mode capacitance.
Preferably, the second source filter circuit includes first electric source filter circuit, further includes, the 3rd punching electricity The output terminal of appearance and the 4th feedthrough capacitor, first differential mode inductance and the second differential mode inductance passes through the 3rd punching electricity respectively Hold and the 4th feedthrough capacitor is grounded.
Preferably, first feedthrough capacitor, the second feedthrough capacitor, the 3rd feedthrough capacitor, the 4th feedthrough capacitor are respectively mounted In partition between the first chamber and the 3rd chamber.
Electric source filter circuit and signal filter circuit are arranged at a housing by filtering unit provided by the utility model In, it is integrated into a filtering unit.In use, the filtering unit is mounted on by screw on the side wall of outer shell of electronic equipment, Its input line is drawn from the mounting surface of filtering unit, and the shell through electronic equipment is connected with other electronic equipments, so as to right The input/output signal of electronic equipment is effectively isolated.Also, the filtering unit can just solve to own by once mounting Filtering problem, greatly simplify installation process, while reduce the waste in electronic equipment internal space, improve integrated journey Degree.In addition, electric source filter circuit and signal filter circuit are separately mounted in the different chamber of housing, it can be to power delivery Line and signal transmssion line are effectively isolated, and ensure the reliability service of electronic equipment, are avoided mutually dry between power supply and signal It disturbs.Filtering unit provided by the utility model, integrated level is high, and small, signal shielding effect is good, can efficiently solve electronics In equipment the problem of electromagnetic compatibility.
Description of the drawings
Fig. 1 is the internal structure schematic diagram of the utility model embodiment;
Fig. 2 is the structure diagram of the utility model embodiment cover plate;
Fig. 3 is the top view of Fig. 1;
Fig. 4 is the left view of Fig. 1;
Fig. 5 is the bottom view of Fig. 1;
Fig. 6 is the first electric source filter circuit schematic diagram in the utility model embodiment;
Fig. 7 is second source filter circuit schematic diagram in the utility model embodiment;
Fig. 8 is the first signal filter circuit schematic diagram in the utility model embodiment;
Fig. 9 is secondary signal filter circuit schematic diagram in the utility model embodiment;
In figure:1 is signal filter circuit, and 2 be electric source filter circuit, and 3 be housing, and 4 be cover board, and 5 be insulating sheath, and 6 are Resin seal spiral shell fills wave filter, and 11 be the input terminal lead of signal filter circuit, and 12 be the output terminal lead of signal filter circuit, 21 be the input terminal lead of electric source filter circuit, and 22 be the output terminal lead of electric source filter circuit.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing, to this reality It is further elaborated with new.
Fig. 1 is the structure diagram of the utility model embodiment, including:Signal filter circuit 1, electric source filter circuit 2, shell Body 3, cover board 4;The housing 3 includes at least two chambers, and the signal filter circuit 1 and electric source filter circuit 2 are located at respectively In described two chambers;The input terminal lead 11 and output terminal lead 12 of the signal filter circuit 1 both pass through the housing 3 Side wall extends to the outside of housing 3;The input terminal lead 21 and output terminal lead 22 of the electric source filter circuit 2 both pass through described The side wall of housing 3 extends to the outside of housing 3;The cover board 4 is adapted to the housing 3.Preferably, cover board 4 passes through 6 screws It is fixed on housing 3.
In the present embodiment, partition is respectively equipped in the horizontal direction and vertical direction of housing 3, separates and is divided into housing 3 Three chambers;Three chambers are respectively the first chamber positioned at 3 upper left quarter of housing, positioned at the second chamber of 3 lower left quarter of housing, position In the 3rd chamber of 3 right part of housing;Signal filter circuit 1 is located in above-mentioned second chamber, and electric source filter circuit 2 is located at above-mentioned the In three chambers.Also, partition is made into integration with housing, and not using individual partition plate split cavity, this mode can make electromagnetism Signal shielding reaches optimum efficiency.Meanwhile lower madial wall, the left inside side wall of second chamber, the 3rd chamber in above-mentioned second chamber Insulating sheath 5, the input terminal lead of signal filter circuit 1 are fixed on the lower madial wall of room, the left inside side wall of first chamber respectively 11 and output terminal lead 12, the input terminal lead 21 of electric source filter circuit 2 and output terminal lead 22 respectively by above-mentioned insulation protect Set 5 is pierced by, and extends to the outside of housing.Insulating sheath 5 can preferably avoid the electromagnetic interference between circuit.
In the present embodiment, signal filter circuit 1 is integrated on signal filter circuit plate, which passes through small Plain cushion, standard spring washer and Cross Recess Head Screw are fixed in second chamber, and the ground wire of signal filter circuit plate passes through ten Word slot pan head screw is connected with housing 3.The input terminal lead 11 of signal filter circuit 1 is set to two, correspondingly, signal filtered electrical Two different signal filter circuits, respectively the first signal filter circuit and secondary signal filter circuit are integrated on the plate of road, such as Shown in Fig. 8 and Fig. 9, to meet the needs of different types of electronic equipment.It is of course also possible to circuit diagram shown in Fig. 8 is only integrated, Or only integrate circuit diagram shown in Fig. 9.The signal filtered is needed to be welded on signal filter circuit plate by input terminal lead 11 On inputted, the signal for filtering completion is welded on signal filter circuit plate by output terminal lead 12 and is exported, above-mentioned Lead has corresponding insulating sheath.
Specifically, as shown in Figure 8 and Figure 9, the first signal filter circuit is 4 input ports, and input terminal is respectively by the One filter capacitor Cy1, the second filter capacitor Cy2, the 3rd filter capacitor Cy3, the 4th filter capacitor Cy4 ground connection;Secondary signal is filtered Wave circuit is 5 input ports, and input terminal passes through the 5th filter capacitor Cy5, the 6th filter capacitor Cy6, the 7th filtered electrical respectively Hold Cy7, the 8th filter capacitor Cy8, the 9th filter capacitor Cy9 ground connection.The filter capacitor of above-mentioned first filter capacitor Cy1~the 9th Cy9 is welded on signal filter circuit plate.
Further, electric source filter circuit 2 includes the first electric source filter circuit and/or second source filter circuit.This two Group filter circuit disclosure satisfy that the power input requirement of different capacity.Specifically, low power power supply passes through the first power filter Circuit filtering, powerful power supply are filtered by second source filter circuit.
In the present embodiment, as shown in fig. 6, the first electric source filter circuit includes the first common mode inductance L1, the second common mode inductance L2, the first differential mode inductance L3, the second differential mode inductance L4, the first feedthrough capacitor CF1, the second feedthrough capacitor CF2;First common mode Inductance L1, which includes the first inductance L1-1 and the second inductance L1-2, the second common mode inductance L2, includes the 3rd inductance L2-1 and the 4th Inductance L2-2;The input terminal of input terminal connection the first common mode inductance L1 of first electric source filter circuit, described first The output terminal of common mode inductance L1 connects the input terminal of the second common mode inductance L2;The 3rd inductance L2-1 passes through described first Differential mode inductance L3 is connected to the output head anode of the first electric source filter circuit, and the 4th inductance L2-2 passes through second differential mode Inductance L4 is connected to the negative pole of output end of the first electric source filter circuit;Being bridged between the input terminal of the first common mode inductance L1 has First capacitance C1, between the output terminal of the first common mode inductance L1 bridging have the second capacitance C2;The two of the second capacitance C2 End is grounded respectively by the 3rd capacitance C3 and the 4th capacitance C4;Bridging has the 5th between the output terminal of the second common mode inductance L2 The both ends of capacitance C5, the 5th capacitance C5 are grounded respectively by the 6th capacitance C6 and the 7th capacitance C7;The first differential mode electricity The output terminal for feeling L3 and the second differential mode inductance L4 is grounded respectively by the first feedthrough capacitor CF1 and the second feedthrough capacitor CF2; The first capacitance C1 is differential mode capacitor, and the 3rd capacitance C3, the 4th capacitance C4, the 6th capacitance C6, the 7th capacitance C7 are common Mould capacitance.
In the present embodiment, second source filter circuit further includes, the 3rd in addition to including above-mentioned first electric source filter circuit The output terminal of feedthrough capacitor CF3 and the 4th feedthrough capacitor CF4, the first differential mode inductance L3 and the second differential mode inductance L4 pass through respectively Three feedthrough capacitor CF3 and the 4th feedthrough capacitor CF4 ground connection.Above-mentioned first feedthrough capacitor CF1, the second feedthrough capacitor CF2, the 3rd wear Electrocardio holds CF3, the 4th feedthrough capacitor CF4 is also referred to as resin seal spiral shell dress wave filter, is installed in the first chamber and institute It states in the partition between the 3rd chamber.It should be noted that when electric source filter circuit 2 simultaneously including the first electric source filter circuit and During second source filter circuit, electronic component is two sets in the 3rd chamber included in the first filter circuit, accordingly Ground, resin seal spiral shell dress wave filter is 6, often row 3, in the partition between first chamber and the 3rd chamber, As shown in Figure 1.At this point, the output of electric source filter circuit penetrates first chamber by resin seal spiral shell dress wave filter 6, then from fixation Insulating sheath 5 on the left side wall of first chamber is pierced by.
After the completion of foregoing circuit assembling, coating organic silica gel on signal filter circuit plate, the 3rd chamber uses heat conduction organic The complete embedding of silica gel, to ensure the insulating requirements of filtering unit and environment fitness requirement.After organic silica gel curing, close the lid Plate 4, cover board are fixed by 6 cross recessed countersunk head sscrews.
Electric source filter circuit and signal filter circuit are arranged at a housing by filtering unit provided by the utility model In, it is integrated into a filtering unit.In use, the filtering unit is mounted on by screw on the side wall of outer shell of electronic equipment, Its input line is drawn from the mounting surface of filtering unit, and the shell through electronic equipment is connected with other electronic equipments, so as to right The input/output signal of electronic equipment is effectively isolated.Also, the filtering unit can just solve to own by once mounting Filtering problem, greatly simplify installation process, while reduce the waste in electronic equipment internal space, improve integrated journey Degree.In addition, electric source filter circuit and signal filter circuit are separately mounted in the different chamber of housing, it can be to power delivery Line and signal transmssion line are effectively isolated, and ensure the reliability service of electronic equipment, are avoided mutually dry between power supply and signal It disturbs.Filtering unit provided by the utility model, integrated level is high, and small, signal shielding effect is good, can efficiently solve electronics In equipment the problem of electromagnetic compatibility.
Certainly, the utility model can also have other various embodiments, without departing substantially from the utility model spirit and its essence In the case of, those skilled in the art can make various corresponding changes and deformation, but these phases according to the utility model The change and deformation answered should all belong to the scope of the claims appended by the utility model.

Claims (10)

1. a kind of filtering unit, which is characterized in that including:Signal filter circuit (1), electric source filter circuit (2), housing (3), lid Plate (4);The housing (3) includes at least two chambers, the signal filter circuit (1) and electric source filter circuit (2) difference position In described two chambers;The input terminal lead (11) and output terminal lead (12) of the signal filter circuit (1) both pass through institute The side wall for stating housing (3) extends to the outside of housing (3);The input terminal lead (21) of the electric source filter circuit (2) and output The side wall that end lead (22) both passes through the housing (3) extends to the outsides of housing (3);The cover board (4) and the housing (3) Adaptation.
2. filtering unit according to claim 1, which is characterized in that the horizontal direction and vertical direction of the housing (3) On be respectively equipped with partition, housing (3) is divided into three chambers by the partition;Three chambers are respectively to be located at housing (3) The first chamber of upper left quarter, positioned at the second chamber of housing (3) lower left quarter, positioned at the 3rd chamber of housing (3) right part;The letter Number filter circuit (1) is located in the second chamber, and the electric source filter circuit (2) is located in the 3rd chamber.
3. filtering unit according to claim 2, which is characterized in that the signal filter circuit (1) is integrated in signal filter On wave circuit plate, the signal filter circuit plate is fixed on by Cross Recess Head Screw in the second chamber.
4. filtering unit according to claim 3, which is characterized in that coating organosilicon on the signal filter circuit plate Glue, the 3rd chamber use heat-conducting organic silica gel embedding.
5. filtering unit according to claim 2, which is characterized in that the partition is made into integration with housing (3).
6. filtering unit according to claim 2, which is characterized in that lower madial wall, the second chamber in the second chamber The left inside side wall of room, the lower madial wall of the 3rd chamber, first chamber left inside side wall on respectively fix insulating sheath (5), it is described Input terminal lead (11) and output terminal lead (12), the input terminal of the electric source filter circuit (2) of signal filter circuit (1) draw Line (21) and output terminal lead (22) are pierced by respectively by the insulating sheath (5), extend to the outside of housing (3).
7. filtering unit according to claim 1, which is characterized in that the electric source filter circuit (2) includes the first power supply Filter circuit and/or second source filter circuit.
8. filtering unit according to claim 7, which is characterized in that first electric source filter circuit includes the first common mode Inductance (L1), the second common mode inductance (L2), the first differential mode inductance (L3), the second differential mode inductance (L4), the first feedthrough capacitor (CF1), the second feedthrough capacitor (CF2);First common mode inductance (L1) includes the first inductance (L1-1) and the second inductance (L1- 2), second common mode inductance (L2) includes the 3rd inductance (L2-1) and the 4th inductance (L2-2);The first power filter electricity The input terminal on road connects the input terminal of first common mode inductance (L1), the output terminal connection institute of first common mode inductance (L1) State the input terminal of the second common mode inductance (L2);3rd inductance (L2-1) is connected to by first differential mode inductance (L3) The output head anode of one electric source filter circuit, the 4th inductance (L2-2) are connected to by second differential mode inductance (L4) The negative pole of output end of one electric source filter circuit;Bridging has the first capacitance between the input terminal of first common mode inductance (L1) (C1), bridging has the second capacitance (C2) between the output terminal of first common mode inductance (L1);The two of second capacitance (C2) End is grounded respectively by the 3rd capacitance (C3) and the 4th capacitance (C4);It is bridged between the output terminal of second common mode inductance (L2) There is the 5th capacitance (C5), the both ends of the 5th capacitance (C5) are grounded respectively by the 6th capacitance (C6) and the 7th capacitance (C7); The output terminal of first differential mode inductance (L3) and the second differential mode inductance (L4) respectively by first feedthrough capacitor (CF1) and Second feedthrough capacitor (CF2) is grounded;First capacitance (C1) be differential mode capacitor, the 3rd capacitance (C3), the 4th capacitance (C4), the 6th capacitance (C6), the 7th capacitance (C7) are common mode capacitance.
9. filtering unit according to claim 7, which is characterized in that the second source filter circuit includes described first Electric source filter circuit further includes, the 3rd feedthrough capacitor (CF3) and the 4th feedthrough capacitor (CF4), first differential mode inductance (L3) It is connect respectively by the 3rd feedthrough capacitor (CF3) and the 4th feedthrough capacitor (CF4) with the output terminal of the second differential mode inductance (L4) Ground.
10. filtering unit according to claim 8, which is characterized in that first feedthrough capacitor (CF1), the second punching Capacitance (CF2), the 3rd feedthrough capacitor (CF3), the 4th feedthrough capacitor (CF4) are installed in the first chamber and the 3rd chamber In partition between room.
CN201720676339.2U 2017-06-06 2017-06-06 A kind of filtering unit Active CN207410309U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720676339.2U CN207410309U (en) 2017-06-06 2017-06-06 A kind of filtering unit

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Application Number Priority Date Filing Date Title
CN201720676339.2U CN207410309U (en) 2017-06-06 2017-06-06 A kind of filtering unit

Publications (1)

Publication Number Publication Date
CN207410309U true CN207410309U (en) 2018-05-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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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