CN203574839U - Circuit for improving radio-frequency sensitivity of bluetooth earphone - Google Patents
Circuit for improving radio-frequency sensitivity of bluetooth earphone Download PDFInfo
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- CN203574839U CN203574839U CN201320605372.8U CN201320605372U CN203574839U CN 203574839 U CN203574839 U CN 203574839U CN 201320605372 U CN201320605372 U CN 201320605372U CN 203574839 U CN203574839 U CN 203574839U
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Abstract
The utility model discloses a circuit for improving radio-frequency sensitivity of a bluetooth earphone. The circuit comprises a radio frequency circuit and a power supply circuit for supplying the radio frequency circuit with power. The circuit is characterized by further comprising a pre-stage filter circuit connected to an output terminal of the power supply circuit and a post-stage filter circuit connected to a power supply terminal of the radio frequency circuit. According to the technical scheme, the circuit is simple and can achieve filtering of the front and the back segment of the circuit to inhibit interference of 2.4 GHz radio-frequency signal noise in the power supply circuit, so that the radio-frequency sensitivity of a bluetooth earphone is largely improved.
Description
Technical field
The utility model relates to bluetooth earphone technical field, particularly a kind of circuit that can improve bluetooth earphone radio-frequency sensitivity.
Background technology
The radio circuit of bluetooth earphone uses Switching Power Supply to power at present, and as shown in Figure 1, referring to Fig. 1, Switching Power Supply power supply circuits comprise Switching Power Supply, energy storage inductor L1, filter capacitor C1 and C2 to its operating circuit.The energy storage inductor L1 of Switching Power Supply is microhenry level, and filter capacitor C1 is microfarad range, and filter capacitor C2 is nanofarad range.
Bluetooth earphone is more and more tending towards miniaturization, and radio-frequency antenna and switching circuit distance are nearer, and radio frequency interference is more obvious.At bluetooth earphone duration of work, in circuit, can receive the noise jamming of 2.4GHz radiofrequency signal by the mode of coupling, if this interference source is entered radio circuit and can be had influence on the performance, particularly sensitivity of radio frequency by radio frequency powered end.Because the filter circuit in available circuit can not effectively suppress the interference of the 2.4GHz radiofrequency signal noise in circuit.Therefore, in the urgent need to a kind of technical scheme of raising bluetooth earphone radio-frequency sensitivity of simple possible.
Utility model content
In view of the above problems, the utility model provides a kind of a kind of circuit that improves bluetooth earphone radio-frequency sensitivity that overcomes the problems referred to above or address the above problem at least in part.
The utility model discloses a kind of circuit that improves bluetooth earphone radio-frequency sensitivity, this circuit comprises: radio circuit and provide the power supply circuits of electric power for radio circuit, it is characterized in that, this circuit also comprises the prime filter circuit and the rear class filter circuit that is connected radio circuit feeder ear that connect power supply circuits output.
Alternatively, power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Prime filter circuit is filter inductance, and rear class filter circuit is the 3rd filter capacitor.
One end of energy storage inductor is connected with the output of Switching Power Supply, and one end of the other end and filter inductance is connected.
The other end of filter inductance is connected respectively with the first filter capacitor, the second filter capacitor and one end of the 3rd filter capacitor; The equal ground connection of the other end of the first filter capacitor, the second filter capacitor and the 3rd filter capacitor.
The other end of filter inductance is also connected with the feeder ear of radio circuit.
Alternatively, power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Prime filter circuit is the 3rd filter capacitor, and rear class filter circuit is filter inductance.
One end of energy storage inductor is connected with the output of Switching Power Supply, and the other end is connected respectively with the first filter capacitor, the second filter capacitor and one end of the 3rd filter capacitor.
The equal ground connection of the other end of the first filter capacitor, the second filter capacitor and the 3rd filter capacitor.
The other end of energy storage inductor is also connected with one end of filter inductance, and the other end of filter inductance connects radio circuit feeder ear.
Alternatively, power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Prime filter circuit is LC or the π type filter circuit that is comprised of inductance and electric capacity, and rear class filter circuit is LC or the π type filter circuit that is comprised of inductance and electric capacity;
One end of energy storage inductor is connected with the output of Switching Power Supply, and the other end is connected with one end of prime filter circuit;
The other end of prime filter circuit is connected respectively with the first filter capacitor, the second filter capacitor and one end of rear class filter circuit; The equal ground connection of the other end of the first filter capacitor and the second filter capacitor.
Alternatively, the first filter capacitor is microfarad range electric capacity; The second filter capacitor is nanofarad range electric capacity; Energy storage inductor is microhenry level inductance.
Alternatively, the 3rd filter capacitor is pico farad level electric capacity, and filter inductance is nanohenry level inductance.
Alternatively, the 3rd filter capacitor is 8.2 pf capacitance value, and filter inductance is 15 nanohenry inductance.
The circuit of this raising bluetooth earphone radio-frequency sensitivity of the present utility model increases respectively filter circuit by the feeder ear of the output in bluetooth earphone power supply circuits Switching Power Supply and radio circuit, realize circuit leading portion and back segment filtering, circuit is simple can also be suppressed the interference of the 2.4GHz radiofrequency signal in bluetooth earphone radio frequency powered circuit simultaneously, thus raising by a relatively large margin the radio-frequency sensitivity of bluetooth earphone.
Accompanying drawing explanation
Fig. 1 is existing bluetooth earphone radio frequency powered circuit diagram;
Fig. 2 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment mono-;
Fig. 3 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment bis-;
Fig. 4 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment tri-;
Fig. 5 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment tetra-;
Fig. 6 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment five.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model execution mode is described in further detail.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that the utility model provides comprises: radio circuit and also comprise the prime filter circuit and the rear class filter circuit that is connected radio circuit feeder ear that connect power supply circuits output for radio circuit provides the power supply circuits of electric power, this circuit.Below enumerating specific embodiment is elaborated to the technical solution of the utility model.
Specific embodiment one
Fig. 2 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment mono-, referring to Fig. 2, in specific embodiment of the utility model one, the structure of filter circuit is LC type, the LC type filter circuit forming by the filter inductance L2 as prime filter circuit with as the 3rd filter capacitor C3 of rear class filter circuit.
Referring to Fig. 2, the circuit of the raising bluetooth earphone radio-frequency sensitivity in the present embodiment one specifically comprises: radio circuit and provide the power supply circuits of electric power for radio circuit; Power supply circuits comprise Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2, this circuit also comprises the filter inductance L2 as prime filter circuit that connects power supply circuits output, with the 3rd filter capacitor C3 as rear class filter circuit that is connected radio circuit feeder ear.
Referring to Fig. 2, one end of energy storage inductor L1 is connected with the output of Switching Power Supply, and the other end is connected with one end of filter inductance L2.
The other end of filter inductance L2 is connected respectively with one end of the 3rd filter capacitor C3 with the first filter capacitor C1, the second filter capacitor C2, the equal ground connection of the other end of the first filter capacitor C1, the second filter capacitor C2 and the 3rd filter capacitor C3.
The other end of filter inductance L2 is connected with the feeder ear of radio circuit.
In Fig. 2, Switching Power Supply is for providing Bluetooth RF circuit required pulse voltage.Energy storage inductor L1 can be continuous for the voltage that makes Switching Power Supply output.The first filter capacitor C1 is for the alternating component of filtering Switching Power Supply.The interference that the second filter capacitor C2 produces for suppressing circuit digital signal.The noise jamming that filter inductance L2 produces for filtering Switching Power Supply.The 3rd filter capacitor C3 disturbs for the 2.4GHz radiofrequency signal of filtering circuit.
At bluetooth earphone duration of work, the interference source that affects bluetooth earphone radio-frequency sensitivity in circuit mainly contains three, the firstth, from the interference of Switching Power Supply in circuit, the secondth, from the interference of digital signal in circuit, the 3rd is the noise jamming of the 2.4GHz radiofrequency signal in circuit.For above-mentioned three interference sources, in the utility model embodiment, provide corresponding filter circuit to suppress.
First, the noise jamming that the filter inductance L2 as prime filter circuit in the present embodiment produces for filtering Switching Power Supply.The first filter capacitor C1 is for the alternating component of filtering Switching Power Supply.Secondly, the second filter capacitor C2 is in order to suppress the interference that in circuit, digital signal produces.Again, as the 3rd filter capacitor C3 of rear class filter circuit, be used for the interference of the 2.4GHz radiofrequency signal of filtering circuit.By the filter circuit in above-mentioned three steps, the interference source that affects bluetooth earphone radio-frequency sensitivity is effectively suppressed, thus the radio-frequency sensitivity of raising bluetooth earphone.
The the first filter capacitor C1 using in the utility model specific embodiment one is microfarad range electric capacity, and the second filter capacitor C2 is nanofarad range electric capacity.What in embodiment mono-of the present utility model, energy storage inductor adopted simultaneously is the inductance of microhenry level.
The circuit of this raising bluetooth earphone radio-frequency sensitivity in the present embodiment one, newly increased compared with original bluetooth earphone radio frequency powered circuit as filter inductance L2 of prime filter circuit with as a 3rd filter capacitor C3 of rear class filter circuit, and the 3rd filter capacitor C3 is pico farad level electric capacity, filter inductance L2 is nanohenry level inductance.
In specific embodiment of the utility model one, what the 3rd filter capacitor C3 adopted is 8.2 pf capacitance value.
In specific embodiment of the utility model one, what filter inductance L2 adopted is 15 nanohenry inductance.
Certainly, in other embodiment of the present utility model, according to actual bluetooth earphone radio circuit design parameter, and according to the impedance frequency characteristic of electric capacity and inductance, carry out the selection of other values.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that specific embodiment of the utility model one provides, the filter inductance L2 that newly increases a 15nH in existing bluetooth earphone radio frequency powered circuit after energy storage inductor L1 output, the noise jamming of filtering Switching Power Supply output.And in existing bluetooth earphone radio frequency powered circuit with the second filter capacitor C2 the 3rd filter capacitor C3 of a 8.2p in parallel again, to be suppressed in circuit the noise jamming of the 2.4GHz radiofrequency signal that coupling comes in.
Specific embodiment two
Fig. 3 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment bis-, referring to Fig. 3, the LC type filter circuit that the 3rd filter capacitor C3 as prime filter circuit by connecting power supply circuits output that specific embodiment of the utility model two adopts forms with the filter inductance L2 as rear class filter circuit that is connected radio circuit feeder ear.These power supply circuits comprise: Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2.Connect the 3rd filter capacitor C3 as prime filter circuit and the filter inductance L2 as rear class filter circuit that is connected radio circuit feeder ear of power supply circuits output.
Referring to Fig. 3, one end of energy storage inductor L1 is connected with the output of Switching Power Supply, and the other end is connected respectively with one end of the first filter capacitor C1 with described the 3rd filter capacitor C3, the second filter capacitor C2.The equal ground connection of the other end of the first filter capacitor C1, the second filtered electrical C2 appearance and the 3rd filter capacitor C3.
The other end of energy storage inductor L1 is also connected with one end of filter inductance L2, and the other end of filter inductance L2 connects radio circuit feeder ear.
It should be noted that, in the circuit of this raising bluetooth earphone radio-frequency sensitivity that Switching Power Supply, energy storage inductor L1, the first filter capacitor C1 and the second filter capacitor C2 provide at the present embodiment, role and the role of above-mentioned associated electronic components in the circuit of the utility model specific embodiment one are identical.Same, in the present embodiment two, the parameter magnitude of Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and filter inductance L2 is also identical parameters magnitude corresponding to the each associated electronic components with in the utility model specific embodiment one adopting, and repeats no more herein.
Bluetooth earphone duration of work, the interference source that affects bluetooth earphone radio-frequency sensitivity in circuit mainly contains three, the firstth, from the interference of Switching Power Supply, the secondth, from the interference of digital signal in circuit, the 3rd is the noise jamming of the 2.4GHz radiofrequency signal in circuit.For three above-mentioned interference sources, in the utility model embodiment, provide corresponding filter circuit to suppress.
First, the noise jamming that the 3rd filter capacitor C3 as prime filter circuit in the utility model embodiment bis-produces for filtering Switching Power Supply.The first filter capacitor C1 is for the alternating component of filtering Switching Power Supply.Secondly, the second filter capacitor C2 is in order to suppress the interference that in circuit, digital signal produces.Again, as the filter inductance L2 of rear class filter circuit, for the radiofrequency signal of filtering circuit, disturb.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that this specific embodiment two provides, the 3rd filter capacitor C3 that newly increases a 8.2p in existing bluetooth earphone radio frequency powered circuit after energy storage inductor L1 output, the noise jamming of filtering Switching Power Supply output.And in existing bluetooth earphone radio frequency powered circuit the filter inductance L2 of a 15nH in parallel again after the second filter capacitor C2, to be suppressed at the noise jamming of the 2.4GHz radiofrequency signal that in circuit, coupling is come in.
Specific embodiment three
Fig. 4 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment tri-, referring to Fig. 4, in specific embodiment of the utility model three, the structure that connects the prime filter circuit of power supply circuits output is LC type, the rear class filter circuit construction that connects radio circuit feeder ear is LC type, the prime LC type filter circuit being comprised of filter inductance L2 and the 3rd filter capacitor C3; And the rear class LC type filter circuit being formed by the 4th filter capacitor C4 and filter inductance L3.
Referring to Fig. 4, in the present embodiment three, one end of energy storage inductor L1 is connected with the output of Switching Power Supply, and the other end is connected with one end of filter inductance L2.
The other end of filter inductance L2 is connected respectively with one end of filter inductance L3 with the first filter capacitor C3, the second filter capacitor C2, the 3rd filter capacitor C1, the 4th filter capacitor C4, the equal ground connection of the other end of the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and the 4th filter capacitor C4.
The other end of filter inductance L3 is connected with the feeder ear of radio circuit.
It should be noted that, the role in the circuit that in the circuit of this raising bluetooth earphone radio-frequency sensitivity that Switching Power Supply, energy storage inductor L1, the first filter capacitor C1 and the second filter capacitor C2 provide at the present embodiment, role and above-mentioned associated electronic components provide at the utility model specific embodiment one is identical.Same, in the present embodiment, the parameter magnitude of Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and filter inductance L2 is also identical parameters magnitude corresponding to the each associated electronic components with in the utility model specific embodiment one adopting, and repeats no more herein.
In specific embodiment of the utility model three, the parameter magnitude of the 4th filter capacitor C4 and filter inductance L3 is according to actual bluetooth earphone radio circuit design parameter, and according to the impedance frequency characteristic of electric capacity and inductance, carries out the selection of relevant parameter value.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that this specific embodiment three provides, the prime LC type filter circuit that newly increases a filter inductance L2 and a 3rd filter capacitor C3 composition in existing bluetooth earphone radio frequency powered circuit after energy storage inductor L1 output, the noise jamming of filtering Switching Power Supply output.And in existing bluetooth earphone radio frequency powered circuit the rear class LC type filter circuit of a 4th filter capacitor C4 in parallel and a filter inductance L3 composition again after the second filter capacitor C2, to be suppressed at the noise jamming of the 2.4GHz radiofrequency signal that in circuit, coupling is come in.
Specific embodiment four
Fig. 5 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in the utility model embodiment tetra-, referring to Fig. 5, the structure that connects the prime filter circuit of power supply circuits output is LC type filter circuit, the rear class filter circuit construction that connects radio circuit feeder ear is LC type filter circuit, by filter inductance L2 and the 3rd filter capacitor C3, forms prime LC type filter circuit; And the rear class LC type filter circuit being formed by the 4th filter capacitor C4 and filter inductance L3.
Referring to Fig. 5, in the present embodiment four, one end of energy storage inductor L1 is connected with the output of Switching Power Supply, and the other end is connected with one end of the 3rd filter capacitor C3 and filter inductance L2.
The other end of filter inductance L2 is connected respectively with one end of the first filter capacitor C1, the second filter capacitor C2 and filter inductance L3.
The other end of filter inductance L3 is connected with one end of the 4th filter capacitor C4;
The equal ground connection of the other end of the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and the 4th filter capacitor C4.
The other end of filter inductance L3 is also connected with the feeder ear of radio circuit.
It should be noted that, the role in the circuit that in the circuit of this raising bluetooth earphone radio-frequency sensitivity that Switching Power Supply, energy storage inductor L1, the first filter capacitor C1 and the second filter capacitor C2 provide at the present embodiment, role and above-mentioned associated electronic components provide at the utility model specific embodiment one is identical.Same, in the present embodiment, the parameter magnitude of Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and filter inductance L2 is also identical parameters magnitude corresponding to the each associated electronic components with in the utility model specific embodiment one adopting, and repeats no more herein.
In specific embodiment of the utility model four, the parameter magnitude of the 4th filter capacitor C4 and filter inductance L3 is according to actual bluetooth earphone radio circuit design parameter, and according to the impedance frequency characteristic of electric capacity and inductance, carries out the selection of relevant parameter value.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that this specific embodiment four provides, the prime filter circuit that newly increases a 3rd filter capacitor C3 and a filter inductance L2 composition in existing bluetooth earphone radio frequency powered circuit after energy storage inductor L1 output, the noise jamming of filtering Switching Power Supply output.And in existing bluetooth earphone radio frequency powered circuit the rear class filter circuit of a filter inductance L3 in parallel and a 4th filter capacitor C4 composition again after the second filter capacitor C2, to be suppressed at the noise jamming of the 2.4GHz radiofrequency signal that in circuit, coupling is come in.
Specific embodiment five
Fig. 6 is the circuit diagram that improves bluetooth earphone radio-frequency sensitivity in embodiment five of the present utility model, referring to Fig. 6, the structure that connects the prime filter circuit of power supply circuits output is π type, the rear class filter circuit construction that connects radio circuit feeder ear is π type, and this concrete prime filter circuit and rear class filter circuit are the CLC type circuit in π type.By filter inductance L2, the 3rd filter capacitor C3 and the 4th filter capacitor C4, form prime CLC type filter circuit; And the rear class CLC type filter circuit being formed by the 5th filter capacitor C5, filter inductance L3, the 6th filter capacitor C6.
Referring to Fig. 6, in the present embodiment, one end of energy storage inductor L1 is connected with the output of Switching Power Supply, and the other end is connected with one end of filter inductance L2 with the 4th filter capacitor C4.
The other end of filter inductance L2 is connected respectively with one end of the 3rd filter capacitor C3, the first filter capacitor C1, the second filter capacitor C2, the 5th filter capacitor C5, filter inductance L3,
The other end of filter inductance L3 is also connected with one end and the radio circuit feeder ear of the 6th filter capacitor C6 respectively.
The equal ground connection of the other end of the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3, the 4th filter capacitor C4, the 5th filter capacitor C5 and the 6th filter capacitor C6.
It should be noted that, the role in the circuit that in the circuit of this raising bluetooth earphone radio-frequency sensitivity that Switching Power Supply, energy storage inductor L1, the first filter capacitor C1 and the second filter capacitor C2 provide at the present embodiment, role and above-mentioned associated electronic components provide at the utility model specific embodiment one is identical.Same, in the present embodiment, the parameter magnitude of Switching Power Supply, energy storage inductor L1, the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and filter inductance L2 is also identical parameters magnitude corresponding to the each associated electronic components with in the utility model specific embodiment one adopting, and repeats no more herein.
In specific embodiment of the utility model five, the parameter magnitude of the 4th filter capacitor C4, the 5th filter capacitor C5, the 6th filter capacitor C6 and filter inductance L3 is according to actual bluetooth earphone radio circuit design parameter, and according to the impedance frequency characteristic of electric capacity and inductance, carry out the selection of relevant parameter value.
The circuit of this raising bluetooth earphone radio-frequency sensitivity that this specific embodiment five provides, the prime CLC type filter circuit that newly increases a 4th filter capacitor C4, the 3rd filter capacitor C3 and a filter inductance L2 composition in existing bluetooth earphone radio frequency powered circuit after energy storage inductor L1 output, the noise jamming of filtering Switching Power Supply output.And in existing bluetooth earphone radio frequency powered circuit the rear class CLC type filter circuit of in parallel the 5th filter capacitor C5, a filter inductance L3 and a 6th filter capacitor C6 composition again after the second filter capacitor C2, to be suppressed at the noise jamming of the 2.4GHz radiofrequency signal that in circuit, coupling is come in.
It should be emphasized that, the prime filter circuit that connects power supply circuits output in the circuit of raising Bluetooth RF of the present utility model sensitivity can be respectively filter inductance, filter capacitor, LC with the rear class filter circuit that is connected radio circuit feeder ear and the π type filter circuit that formed by inductance and electric capacity in any one, or several combination.Alternatively, π type filter circuit is CLC circuit.
In sum, of the present utility model this at Bluetooth RF power supply circuits compared with existing Bluetooth RF power supply circuits, at the output of existing bluetooth power supply circuits Switching Power Supply and the feeder ear of radio circuit, increase respectively filter circuit, realize circuit leading portion and back segment filtering.Sort circuit of the present utility model is fairly simple, thereby the radio-frequency sensitivity that simultaneously can suppress to the noise jamming of the 2.4GHz radiofrequency signal in bluetooth earphone radio frequency powered circuit raising bluetooth earphone that can be by a relatively large margin, can improve 10dB by the sensitivity of bluetooth earphone according to test the technical solution of the utility model.
The foregoing is only preferred embodiment of the present utility model, be not intended to limit protection range of the present utility model.All any modifications of doing, be equal to replacement, improvement etc. within spirit of the present utility model and principle, be all included in protection range of the present utility model.
Claims (7)
1. one kind is improved the circuit of bluetooth earphone radio-frequency sensitivity, this circuit comprises: radio circuit and provide the power supply circuits of electric power for radio circuit, it is characterized in that, this circuit also comprises the prime filter circuit and the rear class filter circuit that is connected radio circuit feeder ear that connect power supply circuits output.
2. circuit as claimed in claim 1, is characterized in that, described power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Described prime filter circuit is filter inductance, and described rear class filter circuit is the 3rd filter capacitor;
One end of described energy storage inductor is connected with the output of described Switching Power Supply, and one end of the other end and described filter inductance is connected;
The other end of described filter inductance is connected respectively with described the first filter capacitor, the second filter capacitor and one end of the 3rd filter capacitor; The equal ground connection of the other end of described the first filter capacitor, the second filter capacitor and the 3rd filter capacitor;
The other end of described filter inductance is also connected with the feeder ear of described radio circuit.
3. circuit as claimed in claim 1, is characterized in that, described power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Described prime filter circuit is the 3rd filter capacitor, and described rear class filter circuit is filter inductance;
One end of described energy storage inductor is connected with the output of described Switching Power Supply, and the other end is connected respectively with described the first filter capacitor, the second filter capacitor and one end of the 3rd filter capacitor;
The equal ground connection of the other end of described the first filter capacitor, the second filter capacitor and the 3rd filter capacitor;
The other end of described energy storage inductor is also connected with one end of described filter inductance, and the other end of described filter inductance connects radio circuit feeder ear.
4. circuit as claimed in claim 1, is characterized in that, described power supply circuits comprise Switching Power Supply, energy storage inductor, the first filter capacitor, the second filter capacitor; Described prime filter circuit is LC or the π type filter circuit that is comprised of inductance and electric capacity, and described rear class filter circuit is LC or the π type filter circuit that is comprised of inductance and electric capacity;
One end of described energy storage inductor is connected with the output of described Switching Power Supply, and the other end is connected with one end of described prime filter circuit;
The other end of described prime filter circuit is connected respectively with described the first filter capacitor, the second filter capacitor and one end of rear class filter circuit; The equal ground connection of the other end of described the first filter capacitor and the second filter capacitor.
5. the circuit as described in any one in claim 2 to 4, is characterized in that, described the first filter capacitor is microfarad range electric capacity; Described the second filter capacitor is nanofarad range electric capacity; Described energy storage inductor is microhenry level inductance.
6. circuit as claimed in claim 2 or claim 3, is characterized in that, described the 3rd filter capacitor is pico farad level electric capacity, and described filter inductance is nanohenry level inductance.
7. circuit as claimed in claim 6, is characterized in that, described the 3rd filter capacitor is 8.2 pf capacitance value, and described filter inductance is 15 nanohenry inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320605372.8U CN203574839U (en) | 2013-09-27 | 2013-09-27 | Circuit for improving radio-frequency sensitivity of bluetooth earphone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320605372.8U CN203574839U (en) | 2013-09-27 | 2013-09-27 | Circuit for improving radio-frequency sensitivity of bluetooth earphone |
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| CN203574839U true CN203574839U (en) | 2014-04-30 |
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| CN201320605372.8U Expired - Lifetime CN203574839U (en) | 2013-09-27 | 2013-09-27 | Circuit for improving radio-frequency sensitivity of bluetooth earphone |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501479A (en) * | 2013-09-27 | 2014-01-08 | 青岛歌尔声学科技有限公司 | Circuit for improving radio-frequency sensitivity of Bluetooth headset |
| CN108185846A (en) * | 2017-12-29 | 2018-06-22 | 九阳股份有限公司 | A kind of soy bean milk making machine |
-
2013
- 2013-09-27 CN CN201320605372.8U patent/CN203574839U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103501479A (en) * | 2013-09-27 | 2014-01-08 | 青岛歌尔声学科技有限公司 | Circuit for improving radio-frequency sensitivity of Bluetooth headset |
| CN103501479B (en) * | 2013-09-27 | 2018-04-27 | 青岛歌尔声学科技有限公司 | A kind of circuit for improving radio-frequency sensitivity of Bluetooth headset |
| CN108185846A (en) * | 2017-12-29 | 2018-06-22 | 九阳股份有限公司 | A kind of soy bean milk making machine |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |