CN105305814A - Audio power supply circuit and mobile terminal - Google Patents
Audio power supply circuit and mobile terminal Download PDFInfo
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- CN105305814A CN105305814A CN201510090296.5A CN201510090296A CN105305814A CN 105305814 A CN105305814 A CN 105305814A CN 201510090296 A CN201510090296 A CN 201510090296A CN 105305814 A CN105305814 A CN 105305814A
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Abstract
The invention belongs to the technical field of communication, and provides an audio power supply circuit. The audio power supply circuit is connected with an audio play circuit, and comprises a power supply, a DC-DC conversion circuit, and a voltage regulation and stabilization circuit, wherein the voltage regulation and stabilization circuit is connected between the DC-DC conversion circuit and the audio play circuit for regulating the output voltage of the DC-DC conversion circuit and stabilizing the output voltage after regulation. According to the audio power supply circuit provided by the invention, stability of input voltage of the audio play circuit is improved, the play quality of the audio play circuit can be effectively enhanced, and use experience of a user is enhanced.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of audio power circuit and mobile terminal.
Background technology
Please refer to Fig. 1, the battery of existing mobile terminal can not directly for audio playing circuit be powered, usual needs connect DC-to-DC (DC-DC) change-over circuit 03 between power supply 01 and audio playing circuit 02, and power supply 01 voltage transitions can be the voltage of this audio playing circuit 02 applicable by DC-to-DC change-over circuit 03.And due to the ripple of DC-to-DC change-over circuit 03 own higher, and PSRR (PowerSupplyRejectionRatio, Power Supply Rejection Ratio) is lower, and the voltage that DC-to-DC change-over circuit 03 exports is also unstable.
Simultaneously, along with the development of mobile terminal technology, be limited to the complexity of the functional diversity of mobile terminal own and circuit layout, the DC-DC transfer circuit 03 of existing mobile terminal inside is easily subject to the crosstalk of neighbouring power device, easy generation noise, affects the play quality of audio playing circuit.
Summary of the invention
For overcoming the problem of prior art sound intermediate frequency play quality difference, the embodiment of the present invention provides a kind of audio power circuit on the one hand, and be connected with audio playing circuit, comprise power supply and DC-to-DC change-over circuit, described audio power circuit also comprises:
Being connected between described DC-to-DC change-over circuit and described audio playing circuit, for adjusting the output voltage of DC-to-DC change-over circuit, the described output voltage after adjustment being carried out to Voltage Cortrol and the voltage stabilizing circuit of voltage stabilizing.
On the other hand, the embodiment of the present invention additionally provides a kind of mobile terminal, comprises audio power circuit described above.
The embodiment of the present invention by increasing Voltage Cortrol and voltage stabilizing circuit between described DC-to-DC change-over circuit and described audio playing circuit, described Voltage Cortrol and voltage stabilizing circuit effectively can adjust the output voltage of DC-to-DC change-over circuit, and the output voltage stablized further after adjustment, improve the stability of the input voltage of audio playing circuit, effectively can promote the play quality of audio playing circuit, improve the experience of user.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, 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 structural representation of existing audio power circuit;
Fig. 2 is the structural representation of the audio power circuit of the embodiment of the present invention;
Fig. 3 is the circuit diagram of a kind of implementation of active filter circuit described in the embodiment of the present invention;
Fig. 4 is the circuit diagram of the another kind of implementation of active filter circuit described in the embodiment of the present invention.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Please refer to Fig. 2, it is the structural representation of the audio power circuit of the embodiment of the present invention, it is connected with audio playing circuit 4, comprise power supply 1 and DC-to-DC change-over circuit 2, described audio power circuit also comprises and is connected between described DC-to-DC change-over circuit 2 and described audio playing circuit 4, for adjusting the output voltage of DC-to-DC change-over circuit 2, the described output voltage after adjustment is carried out to Voltage Cortrol and the voltage stabilizing circuit 3 of voltage stabilizing.
In the present embodiment, described DC-to-DC change-over circuit 2 comprises forward voltage output and negative voltage output, is respectively connected with described Voltage Cortrol and voltage stabilizing circuit 3 between described forward voltage output and described audio playing circuit 4, between described negative voltage output and described audio playing circuit 4.
The present embodiment is by accessing Voltage Cortrol and voltage stabilizing circuit 3 at forward voltage output and negative voltage output simultaneously, be conducive to the forward voltage output of Simultaneous Stabilization DC-to-DC change-over circuit 2 and the voltage of negative voltage output, guarantee that the input voltage of audio playing circuit 4 is more stable, improve music quality further.
Described Voltage Cortrol and voltage stabilizing circuit 4 comprise LDO (LowDropOutRegular low pressure difference linear voltage regulator) or active filter circuit.
Active filter circuit comprises a RC filter circuit and discrete amplifying circuit.
A described RC filter circuit comprises the first resistance and the first polar capacitor.
The first end of described first resistance is the input of described active filter circuit, second end of described first resistance is that the output of a described RC filter circuit is connected with the input of described discrete amplifying circuit, the anode of described first polar capacitor is connected with the second end of described first resistance, the minus earth of described first polar capacitor.
Described discrete amplifying circuit comprises the second resistance, the second polar capacitor, the 3rd polar capacitor and the first switching tube.
The control end of described switching tube is the input of described discrete amplifying circuit, the hot end of described switching tube is connected with supply voltage with the anode of described second polar capacitor, the minus earth of described second polar capacitor, the anode of the cold end of described switching tube and the first end of described second resistance and described 3rd polar capacitor connects the output into described active filter circuit altogether, and the second end of described second resistance and the negative electrode of described 3rd polar capacitor are connected to ground altogether.
Please refer to Fig. 3, above-mentioned switching tube can be NPN triode Q1, and described first resistance is R1, described first polar capacitor is C1, described second resistance is R2, described second polar capacitor is C2, described 3rd polar capacitor is C3.The ground level of described NPN triode Q1 is the control end of described switching tube, the hot end of the very described switching tube of current collection of described NPN triode Q1, the cold end of the very described switching tube of transmitting of described NPN triode Q1.
In the present embodiment, please refer to Fig. 4, described active filter circuit can also comprise the 2nd RC filter circuit 5 and operational amplification circuit 6.
Described 2nd RC filter circuit 5 comprises the 3rd resistance R3 and quadripolarity electric capacity C4.
The first end of described 3rd resistance R3 is the input of described active filter circuit, second end of described 3rd resistance R3 is that the output of a described RC filter circuit is connected with the input of described operational amplification circuit, the anode of described quadripolarity electric capacity C4 is connected with second end of described 3rd resistance R3, the minus earth of described quadripolarity electric capacity C4.
Described operational amplification circuit 6 is the first operational amplifier.
The inverting input of described first operational amplifier is the input of described operational amplification circuit, the in-phase input end of described first operational amplifier is connected with the output of described first operational amplifier, and the output of described first operational amplifier is the output of described active filter circuit.
The present embodiment effectively can reduce the noise in circuit by use active filter circuit, promote the hi-fi music broadcast performance that terminal is led in existing movement.Make it that there is higher dynamic range, obtain purer sound.
In the present embodiment, described power supply 1 is nickel-cadmium cell, Ni-MH battery or lithium ion battery.
The embodiment of audio power circuit of the present invention by increasing Voltage Cortrol and voltage stabilizing circuit between described DC-to-DC change-over circuit and described audio playing circuit, described Voltage Cortrol and voltage stabilizing circuit effectively can adjust the output voltage of DC-to-DC change-over circuit, and the output voltage stablized further after adjustment, improve the stability of the input voltage of audio playing circuit, effectively can promote the play quality of audio playing circuit, improve the experience of user.
Another embodiment of the present invention provides a kind of mobile terminal, comprise audio power circuit, this audio power circuit is connected with audio playing circuit, comprise power supply and DC-to-DC change-over circuit, described audio power circuit also comprises and is connected between described DC-to-DC change-over circuit and described audio playing circuit, for adjusting the output voltage of DC-to-DC change-over circuit, the described output voltage after adjustment is carried out to Voltage Cortrol and the voltage stabilizing circuit of voltage stabilizing.
Audio power circuit in the present embodiment can also realize all functions in the audio power circuit described in above-described embodiment.
The embodiment of mobile terminal of the present invention by increasing Voltage Cortrol and voltage stabilizing circuit between described DC-to-DC change-over circuit and described audio playing circuit, described Voltage Cortrol and voltage stabilizing circuit effectively can adjust the output voltage of DC-to-DC change-over circuit, and the output voltage stablized further after adjustment, improve the stability of the input voltage of audio playing circuit, effectively can promote the play quality of audio playing circuit, improve the experience of user.
Claims (9)
1. an audio power circuit, is connected with audio playing circuit, comprises power supply and DC-to-DC change-over circuit, it is characterized in that, described audio power circuit also comprises:
Being connected between described DC-to-DC change-over circuit and described audio playing circuit, for adjusting the output voltage of DC-to-DC change-over circuit, the described output voltage after adjustment being carried out to Voltage Cortrol and the voltage stabilizing circuit of voltage stabilizing.
2. audio power circuit as claimed in claim 1, it is characterized in that, described DC-to-DC change-over circuit comprises forward voltage output and negative voltage output, is respectively connected with described Voltage Cortrol and voltage stabilizing circuit between described forward voltage output and described audio playing circuit, between described negative voltage output and described audio playing circuit.
3. audio power circuit as claimed in claim 1 or 2, it is characterized in that, described Voltage Cortrol and voltage stabilizing circuit are low pressure difference linear voltage regulator.
4. audio power circuit as claimed in claim 1 or 2, it is characterized in that, described Voltage Cortrol and voltage stabilizing circuit are active filter circuit.
5. audio power circuit as claimed in claim 4, it is characterized in that, described active filter circuit comprises a RC filter circuit and discrete amplifying circuit;
A described RC filter circuit comprises the first resistance and the first polar capacitor;
The first end of described first resistance is the input of described active filter circuit, second end of described first resistance is that the output of a described RC filter circuit is connected with the input of described discrete amplifying circuit, the anode of described first polar capacitor is connected with the second end of described first resistance, the minus earth of described first polar capacitor;
Described discrete amplifying circuit comprises the second resistance, the second polar capacitor, the 3rd polar capacitor and the first switching tube;
The control end of described switching tube is the input of described discrete amplifying circuit, the hot end of described switching tube is connected with supply voltage with the anode of described second polar capacitor, the minus earth of described second polar capacitor, the anode of the cold end of described switching tube and the first end of described second resistance and described 3rd polar capacitor connects the output into described active filter circuit altogether, and the second end of described second resistance and the negative electrode of described 3rd polar capacitor are connected to ground altogether.
6. audio power circuit as claimed in claim 5, it is characterized in that, described switching tube is NPN triode, the ground level of described NPN triode is the control end of described switching tube, the hot end of the very described switching tube of current collection of described NPN triode, the cold end of the very described switching tube of transmitting of described NPN triode.
7. audio power circuit as claimed in claim 4, it is characterized in that, described active filter circuit comprises the 2nd RC filter circuit and operational amplification circuit;
Described 2nd RC filter circuit comprises the 3rd resistance and quadripolarity electric capacity;
The first end of described 3rd resistance is the input of described active filter circuit, second end of described 3rd resistance is that the output of a described RC filter circuit is connected with the input of described operational amplification circuit, the anode of described quadripolarity electric capacity is connected with the second end of described 3rd resistance, the minus earth of described quadripolarity electric capacity;
Described operational amplification circuit is the first operational amplifier;
The inverting input of described first operational amplifier is the input of described operational amplification circuit, the in-phase input end of described first operational amplifier is connected with the output of described first operational amplifier, and the output of described first operational amplifier is the output of described active filter circuit.
8. the audio power circuit as described in claim 5 or 7, is characterized in that, described power supply is nickel-cadmium cell, Ni-MH battery or lithium ion battery.
9. a mobile terminal, is characterized in that, comprises the audio power circuit described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510090296.5A CN105305814A (en) | 2015-02-27 | 2015-02-27 | Audio power supply circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510090296.5A CN105305814A (en) | 2015-02-27 | 2015-02-27 | Audio power supply circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105305814A true CN105305814A (en) | 2016-02-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510090296.5A Pending CN105305814A (en) | 2015-02-27 | 2015-02-27 | Audio power supply circuit and mobile terminal |
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| CN (1) | CN105305814A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995564A (en) * | 2018-01-25 | 2018-05-04 | 东莞市源康电子有限公司 | A kind of audio amplifier circuit of negative and positive dual power power supply |
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| WO2008127268A2 (en) * | 2006-08-14 | 2008-10-23 | Gct Semiconductor, Inc. | Radio frequency integrated circuit |
| CN101965676A (en) * | 2008-03-12 | 2011-02-02 | 索尼爱立信移动通讯有限公司 | Switch mode electric pressure converter with low current mode reaches the method for carrying out voltage transitions with low current mode |
| CN201742109U (en) * | 2009-11-30 | 2011-02-09 | 成都林海电子有限责任公司 | Portable mobile terminal power supply |
| CN104079068A (en) * | 2014-06-04 | 2014-10-01 | 国家电网公司 | Pilot frequency generation circuit for testing secondary circuit impedance with pilot frequency admittance method |
| CN104123760A (en) * | 2014-06-26 | 2014-10-29 | 天津市松正电动汽车技术股份有限公司 | Electric vehicle signal acquisition circuit |
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2015
- 2015-02-27 CN CN201510090296.5A patent/CN105305814A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008127268A2 (en) * | 2006-08-14 | 2008-10-23 | Gct Semiconductor, Inc. | Radio frequency integrated circuit |
| CN101965676A (en) * | 2008-03-12 | 2011-02-02 | 索尼爱立信移动通讯有限公司 | Switch mode electric pressure converter with low current mode reaches the method for carrying out voltage transitions with low current mode |
| CN201742109U (en) * | 2009-11-30 | 2011-02-09 | 成都林海电子有限责任公司 | Portable mobile terminal power supply |
| CN104079068A (en) * | 2014-06-04 | 2014-10-01 | 国家电网公司 | Pilot frequency generation circuit for testing secondary circuit impedance with pilot frequency admittance method |
| CN104123760A (en) * | 2014-06-26 | 2014-10-29 | 天津市松正电动汽车技术股份有限公司 | Electric vehicle signal acquisition circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107995564A (en) * | 2018-01-25 | 2018-05-04 | 东莞市源康电子有限公司 | A kind of audio amplifier circuit of negative and positive dual power power supply |
| CN107995564B (en) * | 2018-01-25 | 2023-08-08 | 东莞市源康电子有限公司 | Audio amplifying circuit powered by positive and negative dual power supplies |
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Application publication date: 20160203 |
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