CN204291351U - A kind of circuit and active earphone reducing active earphone loop noise - Google Patents
A kind of circuit and active earphone reducing active earphone loop noise Download PDFInfo
- Publication number
- CN204291351U CN204291351U CN201420816823.7U CN201420816823U CN204291351U CN 204291351 U CN204291351 U CN 204291351U CN 201420816823 U CN201420816823 U CN 201420816823U CN 204291351 U CN204291351 U CN 204291351U
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- power line
- integrated circuit
- electric capacity
- active earphone
- earth connection
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Abstract
The utility model provides a kind of circuit and the active earphone that reduce active earphone loop noise.Reduce the circuit of active earphone loop noise, comprise and be laid in integrated circuit modules on PCB and power module, be also connected with an electric capacity between integrated circuit modules and power module, electric capacity is laid in the side of described integrated circuit modules; Also comprise the earth connection of laying parallel with power line, level interval between power line and earth connection is less than or equal to 1/2nd of power line and earth connection live width summation, one pole of electric capacity is electrically connected the power pin of integrated circuit modules by power line, another pole is by the ground pin of earth connection electrical connection integrated circuit modules, and the cloth set direction of electric capacity is consistent with the sense of current flow through on power line.The utility model additionally provides a kind of active earphone.The utility model cost is low, efficiency is high, applicability is wide.
Description
Technical field
The utility model relates to earphone noise reduction technology field, particularly relates to a kind of circuit and the active earphone that reduce active earphone loop noise.
Background technology
Active earphone, the wireless headset comprised with emitter apparatus has a design feature, and namely used loud speaker and PCB are all arranged in auricular concha.Due to the limited space in auricular concha, the distance which defined between loud speaker and PCB is very near, and can only adjust in very little scope.
Integrated circuit modules in prior art in active earphone PCB, the fluctuation often due to internal current during work forms noise source.Because the distance between loud speaker and PCB is very near, these noise sources probably form current loop in electric power loop, or and electronic device is improperly set, as electric capacity etc., form noise current path, cause magnetic field radiation, and then magnetic interference is produced to loud speaker and forms loop noise.
To sum up analyze, the PCB existence that existing active earphone uses easily produces loop current, causes in loud speaker the problem occurring loop noise.
Summary of the invention
The utility model provides a kind of circuit and the method that reduce active earphone loop noise, to reduce the loop noise in prior art in active earphone.
In order to solve the problems of the technologies described above, the utility model adopts following scheme to realize:
Reduce a circuit for active earphone loop noise, comprise and be laid in integrated circuit modules on PCB and power module, wherein said power module is powered to described integrated circuit modules by power line; Also be connected with at least one electric capacity between described integrated circuit modules and described power module, described electric capacity is laid in the side of described integrated circuit modules; Also comprise the earth connection of laying parallel with described power line, level interval between described power line and described earth connection is less than or equal to 1/2nd of described power line and earth connection live width summation, one pole of described electric capacity connects the power pin of described integrated circuit modules by described power line, another pole connects the ground pin of described integrated circuit modules by described earth connection, and the cloth set direction of described electric capacity is consistent with the sense of current flow through on described power line.
Limited space in auricular concha, in order to save space further, described pcb board is preferably multi-layer sheet.
Further, described PCB comprises signals layer and ground plane.
Further, described signals layer is laid with described power line, power module, integrated circuit modules and electric capacity; Described ground plane is laid with described earth connection.
Preferably, the installation position of described electric capacity overlaps along the installation position of PCB normal direction with described power line.
In order to be reduced to minimum by the loop area between described power line and earth connection, described power line overlaps along PCB normal direction with the installation position of described earth connection.
Described power line is preferably directly electrically connected or is electrically connected the power pin of described electric capacity and described integrated circuit modules by the via hole be arranged on PCB.
Described earth connection is preferably directly electrically connected or is electrically connected the ground pin of described electric capacity and described integrated circuit modules by the via hole be arranged on described pcb board.
Preferably, described electric capacity is tantalum electric capacity or ceramic condenser.
The invention also discloses a kind of active earphone, comprise loud speaker and magnet.Described earphone also includes the circuit reducing active earphone loop noise.The circuit of described reduction active earphone loop noise comprises and is laid in integrated circuit modules on PCB and power module, and wherein said power module is powered to described integrated circuit modules by power line; Also be connected with at least one electric capacity between described integrated circuit modules and described power module, described electric capacity is laid in the side of described integrated circuit modules; Also comprise the earth connection of laying parallel with described power line, level interval between described power line and described earth connection is less than or equal to 1/2nd of described power line and earth connection live width summation, one pole of described electric capacity connects the power pin of described integrated circuit modules by described power line, another pole connects the ground pin of described integrated circuit modules by described earth connection, and the cloth set direction of described electric capacity is consistent with the sense of current flow through on described power line.
Adopt reduction active earphone loop noise provided by the utility model and active earphone, the cloth set direction of electric capacity is consistent with the sense of current on described power line, level interval between described power line and earth connection is less than or equal to 1/2nd of described power line and earth connection live width sum, therefore the loop area between described power line and earth connection can be reduced to minimum, efficiently avoid the current loop caused by chip internal noise source, and then drop to minimum by the magnetic field radiation in auricular concha, thus guarantee that therefore earphone speaker can not be interfered.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram that the utility model reduces a kind of embodiment of circuit of active earphone loop noise;
Fig. 2 is the schematic diagram that the utility model reduces the another kind of embodiment of the circuit of active earphone loop noise.
Fig. 3 is for being provided with the structural representation of the active earphone of the reduction active earphone loop noise circuit shown in Fig. 1.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment one, shown in Figure 1, the circuit of the reduction loop noise of the present embodiment comprises integrated circuit modules 1 and supply module 2.Described integrated circuit modules 1 can be the integrated circuit realizing radio-frequency receiving-transmitting function.Described supply module 2 is powered to described integrated circuit modules 1 by the power line 3 of drawing from described supply module 2.Described earth connection 4 and the parallel laying of described power line 3.In order to the high-frequency noise in filtering circuit, cut off the path that high-frequency noise is undertaken by current supply circuit propagating, between power line 3 and earth connection 4, be also connected with filter capacitor 5.Filter capacitor 5 is laid in the side of integrated circuit modules 1.In the prior art, filter capacitor 5 is connected in parallel between holding wire and ground wire often to play the bypass effect to high-frequency noise.But, because the operational environment of active earphone is different.When active earphone works, the operating current of integrated circuit modules 1 there will be fluctuation, and inevitably, chip internal can form noise source, makes filter capacitor 5, power line 3, forms current circuit between earth connection 4 and integrated circuit modules 1.This current circuit can change magnetic field, and is caused in loud speaker by electromagnetic radiation and occur electromagnetic noise.Therefore filter capacitor 5 also can not play the effect of expection filter out noise.
Because magnetic field intensity is closely-related with loop area.Compared to traditional integrated circuit for active earphone, the level interval described in the present embodiment between power line 3 and earth connection 4 is less than or equal to 1/2nd of the live width sum of described power line 3 and earth connection 4; One pole of the filter capacitor 5 used connects described power line 3, another pole connects described earth connection 4, the direction that cloth set direction and the electric current of filter capacitor 5 flow through described power line 3 is consistent, thus farthest reduce the area of current circuit, to overcome the electromagnetic radiation because current loop causes.Described power line 3 is directly electrically connected the power pin 1-1 of described filter capacitor 5 and described integrated circuit modules 1, and described earth connection 4 is directly electrically connected the power pin 1-2 of described filter capacitor 5 and described integrated circuit modules 1.
Embodiment two, due to the limited space in active earphone auricular concha, the PCB used in another embodiment of the present utility model is four laminates.As shown in Figure 2, described integrated circuit modules 1, power module 2 and filter capacitor 5 are laid in the ground floor 6-1 of PCB, and described power line 3 is laid in the second layer 6-2 of PCB, the signals layer of 6-1 and 6-2 and PCB; Described earth connection is laid in the third layer 6-3 of PCB, i.e. the ground plane of PCB.PCB all offers multiple via holes 7 of connecting power line 3 and earth connection 4.Via hole 7 has minimum distributed inductance, and its Main Function is to provide the shortest return flow path of power line 3 and earth connection 4.By via hole 7, described power line 3 is electrically connected a pole of described filter capacitor 5 and the power pin 1-1 of described integrated circuit modules 1 respectively; Described earth connection 4 is electrically connected another pole of described filter capacitor 5 and the ground pin one-2 of described integrated circuit modules 1 respectively, and the layer of wearing realizing cabling connects.Normal direction along PCB is seen, the level interval between described power line 3 and the installation position of earth connection 4 is less than 1/2nd of described power line 3 and earth connection 4 live width summation; The installation position of described power line 3, earth connection 4 and filter capacitor 5 keeps overlapping.The installation position of described filter capacitor 5 is consistent with the sense of current flow through on described power line 3.
The filter capacitor 5 adopted in above-described embodiment one and embodiment two is tantalum electric capacity or ceramic condenser.
The circuit of the reduced active earphone loop noise provided in above-described embodiment, is electrically connected described power line by arranging a pole, another pole electrical connection earth connection, and cloth set direction with flow through the filter capacitor that on described power line, the sense of current is consistent; Coordinate parallel laying and level interval is less than or equal to power line and the earth connection of live width sum half, loop area is reduced to negligible numerical value category, thus avoid in the loud speaker of active earphone and occur electromagnetic noise.
The utility model additionally provides a kind of active earphone, comprises loud speaker 8 and magnet 9.Described active earphone is provided with the circuit of above-described embodiment one, reduction active earphone loop noise described in embodiment two, and its physical circuit referring to the detailed description of Fig. 1 to Fig. 2 and the utility model embodiment one and embodiment two, can not repeat them here.The circuit being provided with described reduction active earphone loop noise possesses corresponding technique effect.
Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (10)
1. reduce a circuit for active earphone loop noise, comprise and be laid in integrated circuit modules on PCB and power module, wherein said power module is powered to described integrated circuit modules by power line; Also be connected with at least one electric capacity between described integrated circuit modules and described power module, described electric capacity is laid in the side of described integrated circuit modules; It is characterized in that, also comprise the earth connection of laying parallel with described power line, the level interval between described power line and described earth connection is less than or equal to 1/2nd of described power line and earth connection live width summation; One pole of described electric capacity is electrically connected the power pin of described integrated circuit modules by described power line, another pole is electrically connected the ground pin of described integrated circuit modules by described earth connection, and the cloth set direction of described electric capacity is consistent with the sense of current flow through on described power line.
2. the circuit of reduction active earphone loop noise according to claim 1, it is characterized in that, described PCB is multi-layer sheet.
3. the circuit of reduction active earphone loop noise according to claim 2, it is characterized in that, described PCB comprises signals layer and ground plane.
4. the circuit of reduction active earphone loop noise according to claim 3, is characterized in that, described signals layer is laid with described power line, power module, integrated circuit modules and electric capacity; Described ground plane is laid with described earth connection.
5. the circuit of reduction active earphone loop noise according to claim 4, is characterized in that, the installation position of described electric capacity overlaps along the installation position of PCB normal direction with described power line.
6. the circuit of reduction active earphone loop noise according to claim 4, is characterized in that, the installation position of described power line overlaps along the installation position of PCB normal direction with described earth connection.
7. the circuit of reduction active earphone loop noise according to claim 1, is characterized in that, described power line is directly electrically connected or is electrically connected the power pin of described electric capacity and described integrated circuit modules by the via hole be arranged on PCB.
8. the circuit of reduction active earphone loop noise according to claim 1, is characterized in that, described earth connection is directly electrically connected or is electrically connected the ground pin of described electric capacity and described integrated circuit modules by the via hole be arranged on described pcb board.
9. the circuit of the reduction active earphone loop noise according to any one of claim 1-8, it is characterized in that, described electric capacity is tantalum electric capacity or ceramic condenser.
10. an active earphone, comprises loud speaker, magnet, it is characterized in that, also comprises the circuit of the reduction active earphone loop noise as described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420816823.7U CN204291351U (en) | 2014-12-22 | 2014-12-22 | A kind of circuit and active earphone reducing active earphone loop noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420816823.7U CN204291351U (en) | 2014-12-22 | 2014-12-22 | A kind of circuit and active earphone reducing active earphone loop noise |
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| Publication Number | Publication Date |
|---|---|
| CN204291351U true CN204291351U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420816823.7U Expired - Fee Related CN204291351U (en) | 2014-12-22 | 2014-12-22 | A kind of circuit and active earphone reducing active earphone loop noise |
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| Country | Link |
|---|---|
| CN (1) | CN204291351U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469617A (en) * | 2014-12-22 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Circuit and method capable of lowering loop noise of active earphone |
-
2014
- 2014-12-22 CN CN201420816823.7U patent/CN204291351U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104469617A (en) * | 2014-12-22 | 2015-03-25 | 青岛歌尔声学科技有限公司 | Circuit and method capable of lowering loop noise of active earphone |
| CN104469617B (en) * | 2014-12-22 | 2018-05-22 | 青岛歌尔声学科技有限公司 | A kind of circuit and method for reducing active earphone loop noise |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150422 Termination date: 20211222 |
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| CF01 | Termination of patent right due to non-payment of annual fee |