CN104954938A - Power amplifier of earphone - Google Patents

Power amplifier of earphone Download PDF

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Publication number
CN104954938A
CN104954938A CN201510299773.9A CN201510299773A CN104954938A CN 104954938 A CN104954938 A CN 104954938A CN 201510299773 A CN201510299773 A CN 201510299773A CN 104954938 A CN104954938 A CN 104954938A
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CN
China
Prior art keywords
electric capacity
chip
resistance
circuit protection
port
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Granted
Application number
CN201510299773.9A
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Chinese (zh)
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CN104954938B (en
Inventor
苏上丁
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Priority to CN201510299773.9A priority Critical patent/CN104954938B/en
Publication of CN104954938A publication Critical patent/CN104954938A/en
Priority to PCT/CN2016/084744 priority patent/WO2016192674A1/en
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Publication of CN104954938B publication Critical patent/CN104954938B/en
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10Regulating voltage or current
    • G05F1/46Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Power Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

An embodiment of the invention discloses a power amplifier of an earphone. The power amplifier comprises a direct-current power module, a circuit protection module and a voltage feedback module. The direct-current power module is connected with the circuit protection module, the voltage feedback module is connected with the direct-current power module and the circuit protection module, the direct-current power module is used for outputting direct-current voltages to the circuit protection module, the circuit protection module is used for providing working voltages for loads according to direct-current voltages outputted by the circuit protection module and providing overload protection, the voltage feedback module is used for sampling the working voltages outputted by the circuit protection module, and impact response of the working voltages is fed to the direct-current power module when sampled load currents jump to cause the impact response of the working voltages, so that offset voltages can be generated by the direct-current power module, and the impact response of the working voltages can be suppressed. The power amplifier in the embodiment of the invention has the advantages that the load current jumping response capacity can be improved, and accordingly the stability of the working voltages can be guaranteed.

Description

A kind of earphone power amplifier
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of earphone power amplifier.
Background technology
USB (Universal Serial Bus is leading to and getting lines crossed) the usual main equipment needs of apparatus interconnection provide USB voltage to from equipment.As the portion portable earphone power amplifier of USB main equipment, except carrying out source of sound input, also there is portable power source function, namely the power module (can be internal battery) utilizing USB main equipment subsidiary, after the process of DC/DC (DC-DC) chip, produce 5V voltage, provide operating voltage (as: 1 ampere) to the USB interconnected from equipment by USB port.In order to the power module damage of the main equipment that prevents connecting line or cause from equipment fault, usual main equipment increases overload protection chip at output port, thus guarantees the safety of main equipment power module.But overload protection chip increases the series impedance of power circuit, thus load current saltus step is made easily to cause the impulse response of operating voltage.
Summary of the invention
The embodiment of the present invention provides a kind of earphone power amplifier.The responding ability of load current saltus step can be improved, keep the stable of operating voltage.
First aspect present invention provides a kind of earphone power amplifier, comprise: DC power supplier, circuit protection module and voltage feedback module, described DC power supplier is connected with described circuit protection module, described voltage feedback module is connected with described DC power supplier and described circuit protection module respectively, described DC power supplier is used for described circuit protection module output dc voltage, the described direct voltage that described circuit protection module is used for exporting according to described circuit protection module provides operating voltage to load, and overload protection is provided, described voltage feedback module is used for sampling to the described operating voltage that described circuit protection module exports, described load current saltus step is obtained when causing the impulse response of described operating voltage when sampling, the impulse response of described operating voltage is fed back to described DC power supplier, bucking voltage is produced to suppress the impulse response of described operating voltage to make described DC power supplier.
In the first possible implementation of first aspect; described DC power supplier comprises DC-DC chip; described DC-DC chip comprises feedback port and output port; described circuit protection module comprises overload protection chip; described overload protection chip comprises output port; described voltage feedback module comprises the first electric capacity, the first resistance, the second resistance and the 3rd resistance, wherein:
One end of described first electric capacity is connected with the described output port of described overload protection chip; the other end of described first electric capacity is connected with one end of described first resistance; the other end of described first resistance is connected with one end of described second resistance, one end of described 3rd resistance and the described feedback port of described DC-DC chip respectively; the other end of described second resistance is connected with the described output port of described DC-DC chip, the other end ground connection of described 3rd resistance.
In conjunction with the first possible implementation of first aspect; in the implementation that the second of first aspect is possible; described circuit protection module also comprises the 4th resistance, and described overload protection chip also comprises input port, enable port and current limliting port, wherein:
The described output port of described DC-DC chip is connected with the described input port of described overload protection chip and described enable port respectively; one end of described 4th resistance is connected with the current limliting port of described overload protection chip, the other end ground connection of described 4th resistance.
In conjunction with the implementation that the second of first aspect is possible, in the third possible implementation of first aspect, described circuit protection module also comprises the second electric capacity and the 3rd electric capacity, wherein:
One end of described second electric capacity is connected with the described input port of described overload protection chip; the other end ground connection of described second electric capacity; one end of described 3rd electric capacity is connected with the described output port of described overload protection chip, the other end ground connection of described 3rd electric capacity.
In conjunction with the first possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, described DC power supplier also comprises inductance and the 5th electric capacity, and described DC-DC chip also comprises input port, first switch port and second switch port, wherein:
The described input port of described DC-DC chip is connected with one end of described inductance and one end of described 5th electric capacity respectively, the other end of described inductance is connected with described first switch port of described DC-DC chip and described second switch port respectively, the other end ground connection of described 5th electric capacity.
In conjunction with the first possible implementation of first aspect, in the 5th kind of possible implementation of first aspect, described voltage feedback module also comprises the 4th electric capacity, one end of described 4th electric capacity is connected with the other end of described first resistance, and the other end of described 4th electric capacity is connected with the described output port of described DC-DC chip.
In conjunction with the first of first aspect and first aspect to the 5th kind of possible implementation, in the 6th kind of possible implementation of first aspect, described first electric capacity is coupling capacitance.
Implement the embodiment of the present invention, DC power supplier is to circuit protection module output dc voltage, the direct voltage that circuit protection module exports according to circuit protection module provides operating voltage to load, and overload protection is provided, voltage feedback module is sampled to the operating voltage that circuit protection module exports, load current saltus step is obtained when causing the impulse response of operating voltage when sampling, the impulse response of operating voltage is fed back to DC power supplier, bucking voltage is produced to suppress the impulse response of operating voltage to make DC power supplier, thus improve the responding ability of load current saltus step, stablizing of safeguard work voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of 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 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 the first embodiment of a kind of earphone power amplifier that the present invention proposes;
Fig. 2 is the structural representation of the second embodiment of a kind of earphone power amplifier that the present invention proposes;
Fig. 3 is the structural representation of the 3rd embodiment of a kind of earphone power amplifier that the present invention proposes.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, Fig. 1 is the structural representation of the first embodiment of a kind of earphone power amplifier that the present invention proposes.As shown in the figure, earphone power amplifier in the embodiment of the present invention comprises DC power supplier 101, circuit protection module 102 and voltage feedback module 103, DC power supplier 101 is connected with circuit protection module 102, voltage feedback module 103 is connected with institute DC power supplier 101 and circuit protection module 103 respectively, DC power supplier 101 is for described circuit protection module output dc voltage, circuit protection module 102 provides operating voltage for the described direct voltage exported according to circuit protection module 102 to load, and overload protection is provided, voltage feedback module 103 is sampled for the described operating voltage exported circuit protection module 102, described load current saltus step is obtained when causing the impulse response of described operating voltage when sampling, the impulse response of described operating voltage is fed back to DC power supplier 101, bucking voltage is produced to suppress the impulse response of described operating voltage to make DC power supplier 101.Thus improve the responding ability of load current saltus step, stablizing of safeguard work voltage.
Please refer to Fig. 2, Fig. 2 is the structural representation of the first embodiment of a kind of earphone power amplifier that the present invention proposes.As shown in the figure, earphone power amplifier in the embodiment of the present invention comprises DC power supplier, circuit protection module and voltage feedback module, described DC power supplier is connected with described circuit protection module, described voltage feedback module is connected with described DC power supplier and described circuit protection module respectively, described DC power supplier is used for described circuit protection module output dc voltage, the described direct voltage that described circuit protection module is used for exporting according to described circuit protection module provides operating voltage to load, and overload protection is provided, described voltage feedback module is used for sampling to the described operating voltage that described circuit protection module exports, described load current saltus step is obtained when causing the impulse response of described operating voltage when sampling, the impulse response of described operating voltage is fed back to described DC power supplier, bucking voltage is produced to suppress the impulse response of described operating voltage to make described DC power supplier.Thus improve the responding ability of load current saltus step, stablizing of safeguard work voltage.
Optionally; described DC power supplier comprises DC-DC chip; described DC-DC chip comprises feedback port FB and output port; described circuit protection module comprises overload protection chip; described overload protection chip comprises output port, and described voltage feedback module comprises the first electric capacity C1, the first resistance R3, the second resistance R1 and the 3rd resistance R2.
Wherein, one end of described first electric capacity C1 is connected with the described output port of described overload protection chip; the other end of described first electric capacity C1 is connected with one end of described first resistance R3; the other end of described first resistance R3 is connected with one end of described second resistance R1, one end of described 3rd resistance R2 and the described feedback port FB of described DC-DC chip respectively; the other end of described second resistance R1 is connected with the described output port of described DC-DC chip, the other end ground connection of described 3rd resistance R2.
Wherein, described first electric capacity C1 is coupling capacitance.Concrete; voltage feedback module is sampled to the described operating voltage that described circuit protection module exports by the first electric capacity C1; when load current saltus step causes the impulse response of described operating voltage; first electric capacity C1 is because be subject to the impulse response of operating voltage; thus induced current is produced; when induced current is transferred to the feedback port of DC-DC chip, DC power supplier produces bucking voltage to suppress the impulse response of described operating voltage.Thus improve the responding ability of load current saltus step, stablizing of safeguard work voltage.
Please refer to Fig. 3, Fig. 3 is the structural representation of the 3rd embodiment of a kind of earphone power amplifier that the present invention proposes.As shown in the figure, earphone power amplifier in the embodiment of the present invention comprises DC power supplier, circuit protection module and voltage feedback module, described DC power supplier is connected with described circuit protection module, described voltage feedback module is connected with described DC power supplier and described circuit protection module respectively, described DC power supplier is used for described circuit protection module output dc voltage, the described direct voltage that described circuit protection module is used for exporting according to described circuit protection module provides operating voltage to load, and overload protection is provided, described voltage feedback module is used for sampling to the described operating voltage that described circuit protection module exports, described load current saltus step is obtained when causing the impulse response of described operating voltage when sampling, the impulse response of described operating voltage is fed back to described DC power supplier, bucking voltage is produced to suppress the impulse response of described operating voltage to make described DC power supplier.
Optionally; described DC power supplier comprises DC-DC chip; described DC-DC chip comprises feedback port FB and output port; described circuit protection module comprises overload protection chip; described overload protection chip comprises output port OUT, and described voltage feedback module comprises the first electric capacity C1, the first resistance R3, the second resistance R1 and the 3rd resistance R2.
Wherein, one end of described first electric capacity C1 is connected with the described output port OUT of described overload protection chip; the other end of described first electric capacity C1 is connected with one end of described first resistance R3; the other end of described first resistance R3 is connected with one end of described second resistance R1, one end of described 3rd resistance R2 and the described feedback port FB of described DC-DC chip respectively; the other end of described second resistance R1 is connected with the described output port of described DC-DC chip, the other end ground connection of described 3rd resistance R2.
Optionally, described circuit protection module also comprises the 4th resistance R4, and described overload protection chip also comprises input port IN, enable port EN and current limliting port ILIM,
Wherein, the described output port OUT of described DC-DC chip is connected with the described input port IN of described overload protection chip and described enable port EN respectively; one end of described 4th resistance R4 is connected with the current limliting port ILIM of described overload protection chip, the other end ground connection of described 4th resistance R4.
Optionally, described circuit protection module also comprises the second electric capacity C4 and the 3rd electric capacity C5.
Wherein, one end of described second electric capacity C4 is connected with the described input port IN of described overload protection chip; the other end ground connection of described second electric capacity C4, one end of described 3rd electric capacity C5 is connected with the described output port OUT of described overload protection chip, the other end ground connection of described 3rd electric capacity C5.
Optionally, described DC power supplier also comprises inductance L 1 and the 5th electric capacity C6, and described DC-DC chip also comprises input port VIN, the first switch port SW1 and second switch port SW2.
Wherein, the described input port VIN of described DC-DC chip is connected with one end of described inductance L 1 and one end of described 5th electric capacity C6 respectively, the other end of described inductance L 1 is connected with the described first switch port SW1 of described DC-DC chip and described second switch port SW2 respectively, the other end ground connection of described 5th electric capacity C6.
Optionally, described voltage feedback module also comprises the 4th electric capacity C3, and one end of described 4th electric capacity C3 is connected with the other end of described first resistance R3, and the other end of described 4th electric capacity C3 is connected with the described output port of described DC-DC chip.
Wherein, described first electric capacity C1 is coupling capacitance.Concrete; voltage feedback module is sampled to the described operating voltage that described circuit protection module exports by the first electric capacity C1; when load current saltus step causes the impulse response of described operating voltage; first electric capacity C1 is because be subject to the impulse response of operating voltage; thus induced current is produced; when induced current is transferred to the feedback port of DC-DC chip, DC power supplier produces bucking voltage to suppress the impulse response of described operating voltage.
In embodiments of the present invention, DC power supplier is to circuit protection module output dc voltage, the direct voltage that circuit protection module exports according to circuit protection module provides operating voltage to load, and overload protection is provided, voltage feedback module is sampled to the operating voltage that circuit protection module exports, load current saltus step is obtained when causing the impulse response of operating voltage when sampling, the impulse response of operating voltage is fed back to DC power supplier, bucking voltage is produced to suppress the impulse response of operating voltage to make DC power supplier, thus improve the responding ability of load current saltus step, stablizing of safeguard work voltage.
It should be noted that, for each embodiment of the method aforesaid, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, certain some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in specification all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, storage medium can comprise: flash disk, read-only memory are (English: Read-Only Memory, be called for short: ROM), random access device (English: Random Access Memory, RAM), disk or CD etc. be called for short:.
The content download method provided the embodiment of the present invention above and relevant device, system are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (7)

1. an earphone power amplifier, described earphone power amplifier comprises DC power supplier, circuit protection module and voltage feedback module, it is characterized in that, described DC power supplier is connected with described circuit protection module, described voltage feedback module is connected with described DC power supplier and described circuit protection module respectively, described DC power supplier is used for described circuit protection module output dc voltage, the described direct voltage that described circuit protection module is used for exporting according to described circuit protection module provides operating voltage to load, and overload protection is provided, described voltage feedback module is used for sampling to the described operating voltage that described circuit protection module exports, described load current saltus step is obtained when causing the impulse response of described operating voltage when sampling, the impulse response of described operating voltage is fed back to described DC power supplier, bucking voltage is produced to suppress the impulse response of described operating voltage to make described DC power supplier.
2. earphone power amplifier as claimed in claim 1; it is characterized in that; described DC power supplier comprises DC-DC chip; described DC-DC chip comprises feedback port and output port; described circuit protection module comprises overload protection chip; described overload protection chip comprises output port, and described voltage feedback module comprises the first electric capacity, the first resistance, the second resistance and the 3rd resistance, wherein:
One end of described first electric capacity is connected with the described output port of described overload protection chip; the other end of described first electric capacity is connected with one end of described first resistance; the other end of described first resistance is connected with one end of described second resistance, one end of described 3rd resistance and the described feedback port of described DC-DC chip respectively; the other end of described second resistance is connected with the described output port of described DC-DC chip, the other end ground connection of described 3rd resistance.
3. earphone power amplifier as claimed in claim 2, it is characterized in that, described circuit protection module also comprises the 4th resistance, and described overload protection chip also comprises input port, enable port and current limliting port, wherein:
The described output port of described DC-DC chip is connected with the described input port of described overload protection chip and described enable port respectively; one end of described 4th resistance is connected with the current limliting port of described overload protection chip, the other end ground connection of described 4th resistance.
4. earphone power amplifier as claimed in claim 3, it is characterized in that, described circuit protection module also comprises the second electric capacity and the 3rd electric capacity, wherein:
One end of described second electric capacity is connected with the described input port of described overload protection chip; the other end ground connection of described second electric capacity; one end of described 3rd electric capacity is connected with the described output port of described overload protection chip, the other end ground connection of described 3rd electric capacity.
5. earphone power amplifier as claimed in claim 2, it is characterized in that, described DC power supplier also comprises inductance and the 5th electric capacity, and described DC-DC chip also comprises input port, the first switch port and second switch port, wherein:
The described input port of described DC-DC chip is connected with one end of described inductance and one end of described 5th electric capacity respectively, the other end of described inductance is connected with described first switch port of described DC-DC chip and described second switch port respectively, the other end ground connection of described 5th electric capacity.
6. earphone power amplifier as claimed in claim 2, it is characterized in that, described voltage feedback module also comprises the 4th electric capacity, one end of described 4th electric capacity is connected with the other end of described first resistance, and the other end of described 4th electric capacity is connected with the described output port of described DC-DC chip.
7. the earphone power amplifier as described in claim 2 ~ 6 any one, is characterized in that, described first electric capacity is coupling capacitance.
CN201510299773.9A 2015-06-03 2015-06-03 A kind of earphone power amplifier Active CN104954938B (en)

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CN201510299773.9A CN104954938B (en) 2015-06-03 2015-06-03 A kind of earphone power amplifier
PCT/CN2016/084744 WO2016192674A1 (en) 2015-06-03 2016-06-03 Earphone power amplifier

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CN104954938B CN104954938B (en) 2016-10-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016192674A1 (en) * 2015-06-03 2016-12-08 广东欧珀移动通信有限公司 Earphone power amplifier
CN107741918A (en) * 2017-11-10 2018-02-27 郑州云海信息技术有限公司 A kind of hangers USB2.0 Droop voltage compensating circuits and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112367580A (en) * 2020-10-21 2021-02-12 Oppo广东移动通信有限公司 Noise reduction circuit and earphone
CN113031738B (en) * 2021-03-12 2024-05-07 维沃移动通信有限公司 Chip power supply circuit and method

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US4887298A (en) * 1988-06-15 1989-12-12 Renkus-Heinz Electronic circuit for sensing disconnect or failure of a power output sense line in an audio power system
US5577126A (en) * 1993-10-27 1996-11-19 Klippel; Wolfgang Overload protection circuit for transducers
CN202931256U (en) * 2012-11-23 2013-05-08 宁波金源电气有限公司 Multifunctional power amplifier
CN103135648A (en) * 2013-03-20 2013-06-05 电子科技大学 Low dropout regulator
CN204741555U (en) * 2015-06-03 2015-11-04 广东欧珀移动通信有限公司 Earphone power amplifier

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CN104954938B (en) * 2015-06-03 2016-10-19 广东欧珀移动通信有限公司 A kind of earphone power amplifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887298A (en) * 1988-06-15 1989-12-12 Renkus-Heinz Electronic circuit for sensing disconnect or failure of a power output sense line in an audio power system
US5577126A (en) * 1993-10-27 1996-11-19 Klippel; Wolfgang Overload protection circuit for transducers
CN202931256U (en) * 2012-11-23 2013-05-08 宁波金源电气有限公司 Multifunctional power amplifier
CN103135648A (en) * 2013-03-20 2013-06-05 电子科技大学 Low dropout regulator
CN204741555U (en) * 2015-06-03 2015-11-04 广东欧珀移动通信有限公司 Earphone power amplifier

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2016192674A1 (en) * 2015-06-03 2016-12-08 广东欧珀移动通信有限公司 Earphone power amplifier
CN107741918A (en) * 2017-11-10 2018-02-27 郑州云海信息技术有限公司 A kind of hangers USB2.0 Droop voltage compensating circuits and method

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