CN105307085B - A kind of chargeable audio amplification device - Google Patents
A kind of chargeable audio amplification device Download PDFInfo
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- CN105307085B CN105307085B CN201510747252.5A CN201510747252A CN105307085B CN 105307085 B CN105307085 B CN 105307085B CN 201510747252 A CN201510747252 A CN 201510747252A CN 105307085 B CN105307085 B CN 105307085B
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Abstract
The invention discloses a kind of chargeable audio amplification devices, including audio amplifier circuit, the first positive charging end and the first negative charging end, it is characterized in that, it further include the first isolation DC/DC circuit and the second isolation DC/DC circuit, it is described first isolation DC/DC circuit positive output end and negative output terminal connect respectively with the first positive charging end and the first negative charging end, it is described second be isolated DC/DC circuit positive output end and negative output terminal respectively with the power supply of the audio amplifier circuit and connect.It is interfered when this audio amplification device can be effectively reduced TDD current noise, guarantees the result of broadcast of audio.The power consumption of mobile phone when in addition reducing costs and using peripheral hardware audio amplification device.
Description
[technical field]
The present invention relates to a kind of chargeable audio amplification devices.
[background technique]
The mobile phone peripheral hardware sound equipment with charge function is all to be connect using bluetooth with sound equipment currently on the market, iPhone series
Peripheral hardware sound equipment is using digital audio and video signals output direct interface connection, but its method is limited to used in IPhone from main core
Piece has the interface, and peripheral hardware sound equipment is it is necessary that convert digital signals into simulation letter with its audio processing chip authenticated
Number.
Power supply mould is respectively adopted due to the same power input to charge and audio power uses in traditional design scheme
Block, since it must cause audio-frequency unit to have very big power supply noise altogether, even if using the ground and audio portion of charge circuit
The ground divided separates cabling, but due to can all be connected with the topography face of mobile phone after itself and mobile phone connection, noise still can be crosstalked into sound
Frequency part can also have more serious TDD current interference in the case of a 2 g network.
[summary of the invention]
For overcome the deficiencies in the prior art, the present invention provides a kind of chargeable audio amplification devices, so that when this
Audio amplification device charges to mobile communication equipment, and is amplified by the audio signal that tone frequency channel wire receives mobile communication equipment
When, it can be effectively reduced TDD current interference.
A kind of chargeable audio amplification device, including audio amplifier circuit, the first positive charging end and the first negative charging end,
Further include the first isolation DC/DC circuit and second isolation DC/DC circuit, it is described first isolation DC/DC circuit positive output end and
Negative output terminal is connect with the first positive charging end and the first negative charging end respectively, the positive output end of the second isolation DC/DC circuit
With negative output terminal respectively with the power supply of the audio amplifier circuit and connect.
In one embodiment, the chargeable audio amplification device is for charging to mobile communication equipment, institute
Audio amplifier circuit is stated for receiving the audio signal of the mobile communication equipment.
In one embodiment, including multiple grounding ports, the multiple grounding ports are set with the mobile communication respectively
The corresponding grounding ports connection of standby circuit, the multiple grounding ports are connect with the ground of the audio amplifier circuit respectively.
In one embodiment, the audio amplifier circuit is used to receive the audio interface output of the mobile communication equipment
Analog audio signal.
It in one embodiment, further include echo suppression circuit, the echo suppression circuit is used for microphone channel
Signal carries out echo inhibition, and the echo suppression circuit obtains power supply, institute from the positive output end of the second isolation DC/DC circuit
The ground for stating echo suppression circuit is connected with the negative output terminal that described second is isolated DC/DC circuit.
In one embodiment, the first negative charging end connection on the PCBA of the chargeable audio amplification device
Ground wire and the audio amplifier circuit ground wire between interval be not less than 1.5mm.
It in one embodiment, further include third isolation DC/DC circuit, the second positive charging end and the second negative charging end, institute
The positive output end and negative output terminal for stating third isolation DC/DC circuit are connect with the second positive charging end and the second negative charging end respectively.
It in one embodiment, further include CPU, the CPU is obtained from the positive output end of the second isolation DC/DC circuit
Power supply, the negative output terminal that DC/DC circuit is isolated with described second in the ground terminal of the CPU connect.
It in one embodiment, further include rechargeable battery and voltage protection circuit, the input terminal of the voltage protection circuit
It is connect with rechargeable battery, DC/DC circuit and the second isolation is isolated in the output end of the voltage protection circuit with described first respectively
The input terminal of DC/DC circuit connects.
The beneficial effects of the present invention are:
When this audio amplification device to mobile communication equipment charge, and by tone frequency channel wire reception mobile communication equipment audio
When signal amplifies, it can be effectively reduced the interference of TDD current noise, guarantee the result of broadcast of audio.
In addition, use can be saved due to inputting as audio amplification device without using digital signal using analog signal
D/A conversion module necessary to digital signal inputs, reduces costs, while not needing Bluetooth wireless transmission connection, and reducing makes
With the power consumption of mobile phone when peripheral hardware audio amplification device.
[Detailed description of the invention]
Fig. 1 is the schematic diagram of the chargeable audio amplification device of an embodiment of the present invention；
Fig. 2 is the voltage protection circuit schematic diagram of an embodiment of the present invention；
Fig. 3 is the isolation DC/DC circuit diagram of an embodiment of the present invention；
Fig. 4 is the audio amplification device of an embodiment of the present invention and the connection schematic diagram of mobile communication equipment.
[specific embodiment]
The following further describes in detail the preferred embodiments of the invention.
As shown in Figure 1, a kind of chargeable audio amplification device of embodiment, including audio amplifier circuit, first just fill
Electric end, the first negative charging end, the first isolation DC/DC circuit and the second isolation DC/DC circuit, the first isolation DC/DC circuit
Positive output end and negative output terminal connect respectively with the first positive charging end and the first negative charging end, it is described second isolation DC/DC electricity
The positive output end and negative output terminal on road respectively with the power supply of the audio amplifier circuit and connect.
This audio amplification device can charge to mobile communication equipment, and the external audio as mobile communication equipment
The audio signal that the audio interface of mobile communication equipment exports is amplified, is played by amplifying device.
When audio amplification device charges to mobile communication equipment (such as positive charging port and negative charging port difference
It is connect with the positive port of mobile communication equipment and negative terminal mouth), while audio amplification device receives the sound that mobile communication equipment is sent
Frequency signal amplifies, since the power supply and ground of charging are the output of the first isolation DC/DC circuit, audio amplifier circuit
Power supply and ground are the output of the second isolation DC/DC circuit, and therefore, the TDD electric current on mobile communication equipment can't be from charging end
Noise jamming is caused into audio amplifier circuit.
Even if the ground of charging interface is connected to the ground of audio interface in mobile communication equipment, still, when the movement
After communication apparatus is connect with audio amplification device by tone frequency channel wire, when there is TDD current interference in mobile communication equipment, the TDD
Electric current can also flow through in mobile communication equipment, without passing through from audio amplification device, because by isolation DC/DC circuit
Effect, the impedance of audio amplification device side is greater than the impedance in mobile communication equipment for TDD electric current.
Audio amplification device may include that DC/DC circuit, the second positive charging end and the second negative charging end is isolated in third, described
The positive output end and negative output terminal of third isolation DC/DC circuit are connect with the second positive charging end and the second negative charging end respectively.This
Sample audio amplification device can charge to two mobile communication equipments.
Audio amplification device may include rechargeable battery and voltage protection circuit, the input terminal of the voltage protection circuit with
The positive Vbat+ of rechargeable battery is connected with cathode Vbat-, and the output end of the voltage protection circuit is isolated with described first respectively
DC/DC circuit, the second isolation DC/DC circuit are connected with the input terminal of third isolation DC/DC circuit.Voltage protection circuit can rise
To over-voltage, the protection of under-voltage and negative pressure, with the voltage of the input terminal of guarantee isolation DC/DC circuit in the range of setting.At one
In embodiment, voltage protection circuit can use the voltage protection circuit built using TPS25940 chip as core, such as Fig. 2 institute
Show.
As shown in figure 3, in one embodiment, the isolation DC/DC circuit of this audio amplification device is all made of LTM8048,
The positive input terminal of LTM8048 passes through the output end b of inductance connection voltage protection circuit, wherein one group of charging port are as follows: positive charging
Port CHARGE_OUT_1P and negative charging port CHARGE_OUT_1N.
In one embodiment, it is that mobile communication equipment is sent that the audio amplifier circuit of this audio amplification device is received
Analog audio signal, i.e., the analog audio signal sent from the common audio interface of mobile communication equipment.
In one embodiment, this audio amplification device further includes echo suppression circuit, and the echo suppression circuit is used for
Echo inhibition is carried out to the signal of microphone channel, the echo suppression circuit is just defeated from the second isolation DC/DC circuit
Outlet obtains power supply, and the negative output terminal that DC/DC circuit is isolated with described second in the ground of the echo suppression circuit connects, echo suppression
Circuit processed does not obtain power supply from the anode of charging end, and ground terminal is not also connect with the ground of charging end, to avoid echo suppression circuit
It is influenced by TDD electric current.The echo suppression circuit obtains power supply from the positive output end of the second isolation DC/DC circuit,
In other words, the supply voltage of echo suppression circuit can be identical as the second isolation voltage of positive output end of DC/DC circuit,
It can be the small voltage after decompression, can achieve the purpose with charging end isolated from power in this way.
The ground wire and the sound of the first negative charging end connection on the PCBA of the chargeable audio amplification device
Interval between the ground wire of frequency amplifying circuit is not less than 1.5mm, the interference to avoid audio signal by TDD electric current.
In one embodiment, the chargeable audio amplification device further includes CPU, when audio amplification device is with more
When a audio input interface, CPU can control which audio input interface audio amplifier circuit selection is connected to, such as select TI
The TS3A44159RGTR single pole double throw analog of company switchs.Positive output end of the CPU from the second isolation DC/DC circuit
Power supply is obtained, the negative output terminal that DC/DC circuit is isolated with described second in the ground terminal of the CPU connects, in other words, CPU's
Supply voltage can be identical as the second isolation voltage of positive output end of DC/DC circuit, is also possible to smaller after decompression
Voltage can achieve the purpose with charging end isolated from power in this way.
As shown in figure 4, in one embodiment, chargeable audio amplification device includes multiple grounding ports, described more
The grounding ports connection corresponding with the circuit of the mobile communication equipment respectively of a grounding ports, the multiple grounding ports difference
It is connect with the ground of the audio amplifier circuit.Due to being connect between audio amplification device and mobile communication equipment with multiple common
Ground terminal, when audio amplification device is powered mobile communication equipment, and audio amplification device receives mobile communication equipment
When audio signal plays out, audio amplification device is smaller by the interference of TDD current noise.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention by
The scope of patent protection that the claims submitted determine.
Claims (8)
1. a kind of chargeable audio amplification device, including audio amplifier circuit, the first positive charging end and the first negative charging end, institute
Chargeable audio amplification device is stated for charging to mobile communication equipment, the audio amplifier circuit is described for receiving
The audio signal of mobile communication equipment, characterized in that further include being arranged in power input and the first positive charging end, the first negative charging
The first isolation DC/DC circuit between end and be arranged between power input and audio amplifier circuit second that DC/DC be isolated is electric
Road, it is described first isolation DC/DC circuit positive output end and negative output terminal respectively with the first positive charging end and the first negative charging end
Connection, it is described second isolation DC/DC circuit positive output end and negative output terminal respectively with the power supply of the audio amplifier circuit and
Ground connection, so that by the effect of the first isolation DC/DC circuit, the second isolation DC/DC circuit, for TDD electric current
For the impedance of audio amplification device side be greater than the impedance in mobile communication equipment, thus the TDD on mobile communication equipment
Electric current will not cause noise jamming to the audio output of audio amplifier circuit.
2. chargeable audio amplification device as described in claim 1, characterized in that described more including multiple grounding ports
The grounding ports connection corresponding with the circuit of the mobile communication equipment respectively of a grounding ports, the multiple grounding ports difference
It is connect with the ground of the audio amplifier circuit.
3. chargeable audio amplification device as claimed in claim 2, characterized in that the audio amplifier circuit is for receiving
The analog audio signal of the audio interface output of the mobile communication equipment.
4. chargeable audio amplification device as described in claim 1, characterized in that it further include echo suppression circuit, it is described
Echo suppression circuit is used to carry out echo inhibition to the signal of microphone channel, and the echo suppression circuit is isolated from described second
The positive output end of DC/DC circuit obtains power supply, and it is defeated that with described second bearing for DC/DC circuit is isolated in the ground of the echo suppression circuit
Outlet connection.
5. chargeable audio amplification device as described in claim 1, characterized in that in the chargeable audio amplification dress
Interval on the PCBA set between the ground wire of the first negative charging end connection and the ground wire of the audio amplifier circuit is not less than
1.5mm。
6. chargeable audio amplification device as described in claim 1, characterized in that further include third isolation DC/DC circuit,
Second positive charging end and the second negative charging end, the positive output end and negative output terminal of third isolation DC/DC circuit are respectively with the
Two positive charging ends are connected with the second negative charging end.
7. chargeable audio amplification device as described in claim 1, characterized in that further include CPU, the CPU is from described
The positive output end of second isolation DC/DC circuit obtains power supply, and DC/DC circuit is isolated with described second in the ground terminal of the CPU
Negative output terminal connection.
8. chargeable audio amplification device as described in claim 1, characterized in that further include rechargeable battery and voltage protection
The input terminal of circuit, the voltage protection circuit is connect with rechargeable battery, the output end of the voltage protection circuit respectively with institute
State the input terminal connection of the first isolation DC/DC circuit and the second isolation DC/DC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510747252.5A CN105307085B (en) | 2015-11-05 | 2015-11-05 | A kind of chargeable audio amplification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510747252.5A CN105307085B (en) | 2015-11-05 | 2015-11-05 | A kind of chargeable audio amplification device |
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| Publication Number | Publication Date |
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| CN105307085A CN105307085A (en) | 2016-02-03 |
| CN105307085B true CN105307085B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510747252.5A Active CN105307085B (en) | 2015-11-05 | 2015-11-05 | A kind of chargeable audio amplification device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020142869A1 (en) * | 2019-01-07 | 2020-07-16 | 深圳市大疆创新科技有限公司 | Power supply control circuit, power supply system, and movable platform |
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| CN103855784A (en) * | 2012-11-29 | 2014-06-11 | 西安思能网络科技有限公司 | Alternating-current space isolation power supply |
| CN104377755A (en) * | 2014-10-10 | 2015-02-25 | 浙江超威创元实业有限公司 | Multifunctional portable power source |
| FR3005506B1 (en) * | 2013-05-13 | 2015-05-01 | Cddic | ANALOGUE POWER MEASURING CIRCUIT |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166587A (en) * | 2011-12-16 | 2013-06-19 | 富泰华工业（深圳）有限公司 | Audio processing circuit |
| CN102694506A (en) * | 2012-06-06 | 2012-09-26 | 国光电器股份有限公司 | Audio-frequency amplifier system powered based on power supply of computer USB (Universal Serial Bus) power source and integration of USB audio card |
| CN103855784A (en) * | 2012-11-29 | 2014-06-11 | 西安思能网络科技有限公司 | Alternating-current space isolation power supply |
| CN103096216A (en) * | 2013-02-07 | 2013-05-08 | 青岛歌尔声学科技有限公司 | Audio processing circuit and earphone |
| FR3005506B1 (en) * | 2013-05-13 | 2015-05-01 | Cddic | ANALOGUE POWER MEASURING CIRCUIT |
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| CN105307085A (en) | 2016-02-03 |
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