CN107888150B - Power amplification circuit and method for audio signal and terminal equipment - Google Patents
Power amplification circuit and method for audio signal and terminal equipment Download PDFInfo
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- CN107888150B CN107888150B CN201711217730.7A CN201711217730A CN107888150B CN 107888150 B CN107888150 B CN 107888150B CN 201711217730 A CN201711217730 A CN 201711217730A CN 107888150 B CN107888150 B CN 107888150B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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Abstract
The embodiment of the application discloses a power amplification circuit and method of an audio signal and terminal equipment, relates to the technical field of terminals, and can reduce power loss while resisting interference, so that amplification efficiency in the audio signal amplification process is improved. The specific scheme is as follows: the power amplifier is an AB type power amplifier or an A type power amplifier; the input end of the power supply module is used for connecting an audio signal input device; the output end of the power supply module is connected with the power supply end of the power amplifier and used for inputting working voltage to the power amplifier, the absolute value of the working voltage is controlled to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is in a preset range; the input end of the power amplifier is used for being connected with an audio signal input device and used for carrying out power amplification on the audio signal according to the working voltage.
Description
Technical Field
The present application relates to the field of terminal technologies, and in particular, to a power amplification circuit and method for an audio signal, and a terminal device.
Background
A power amplifying circuit is an amplifying circuit for outputting a large power, and it can drive a load such as a speaker to operate. The power amplification circuit comprises a power supply module and a power amplifier. The power supply module is used for supplying power to the whole power amplification circuit; a power amplifier, generally referred to as "power amplifier," is an amplifier capable of generating maximum power output to drive a load under a given distortion rate.
At present, power amplifiers adopted by a power amplifying circuit are generally a class D power amplifier and a class AB power amplifier.
The class-D power amplifier is a pulse-controlled high-current switching amplifier and has the characteristic of high frequency, and the actual efficiency of the class-D power amplifier can reach about 90%; however, the class D power amplifier is liable to interfere with other signals on the device to which the power amplifier is applied, thereby generating noise, and therefore, the class D power amplifier can be generally disposed only at a position close to the speaker, which makes the layout of the power amplifying circuit in the device have a large limitation.
The AB type power amplifier is an amplifier with better anti-interference capability. However, the efficiency is low, when the class AB power amplifier is used, the power supply module inputs the operating voltage to the class AB power amplifier, almost half of the energy generated by the operating voltage is used for heating of the transistor in the power supply module, and the remaining half of the energy is used for amplifying the audio signal by the class AB power amplifier, so the actual efficiency of the class AB power amplifier in amplifying the audio signal is only about 50%.
Disclosure of Invention
The application provides a power amplification circuit, a power amplification method and terminal equipment of an audio signal, which can reduce power loss while resisting interference, thereby improving amplification efficiency in the amplification process of the audio signal.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect of the present application, there is provided a power amplification circuit for an audio signal, including: a power supply module and a power amplifier. The power amplifier is an AB type power amplifier or an A type power amplifier. The input end of the power supply module is used for connecting an audio signal input device; the output end of the power supply module is connected with the power supply end of the power amplifier and used for inputting working voltage to the power amplifier, the absolute value of the working voltage is controlled to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range. The input end of the power amplifier is used for being connected with an audio signal input device and used for carrying out power amplification on the audio signal according to the working voltage.
In the application, the power amplification circuit of the audio signal adopts an AB type power amplifier or an A type power amplifier, so that the audio signal has better anti-interference capability; in addition, the power supply module can control the working voltage input to the power amplifier to enable the absolute value of the difference between the working voltage and the output voltage of the power amplifier to be within a preset range, and useless thermal power generated by the power supply module is very small at the moment, so that power loss is reduced, and the amplification efficiency in the audio signal amplification process is improved.
In a second aspect of the present application, a power amplification method for an audio signal is provided, which can be applied to a power amplification circuit for an audio signal including a power module and a power amplifier, wherein an input terminal of the power module is connected to an audio signal input device, an output terminal of the power module is connected to a power terminal of the power amplifier, and an input terminal of the power amplifier is connected to the audio signal input device. The power amplification method of the audio signal in the application comprises the following steps: the power supply module inputs working voltage to the power amplifier, and the power amplifier is an AB type power amplifier or an A type power amplifier; the power supply module controls the absolute value of the working voltage to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range, so that the power amplifier amplifies the power of the audio signal according to the working voltage.
In the application, the power amplification circuit of the audio signal adopts an AB type power amplifier or an A type power amplifier, so that the audio signal has better anti-interference capability; in addition, the power supply module can control the working voltage input to the power amplifier to enable the absolute value of the difference between the working voltage and the output voltage of the power amplifier to be within a preset range, and useless thermal power generated by the power supply module is very small at the moment, so that power loss is reduced, and the amplification efficiency in the audio signal amplification process is improved.
In a third aspect of the present application, there is provided a terminal device, including: at least one audio signal output device and a power amplification circuit for an audio signal as in the first aspect or a possible implementation form of the first aspect. The power amplifying circuit of the audio signal is used for driving at least one audio signal output device, so that the at least one audio signal output device outputs the amplified audio signal.
In the application, the terminal equipment not only simplifies the layout of the D-type power amplifier, but also saves the cost; and, the loss of power is reduced, thus has raised the amplification efficiency in the amplification process of the audio signal.
In a fourth aspect of the present application, there is provided an apparatus for power amplification of an audio signal, the apparatus comprising: at least one audio signal output device and a power amplification circuit for an audio signal as in the first aspect or a possible implementation form of the first aspect.
Drawings
Fig. 1 is a schematic diagram illustrating a power amplifying circuit for an audio signal according to an embodiment of the present disclosure;
FIG. 2 is a diagram illustrating an example of operating voltage and output voltage in the prior art;
fig. 3 is a schematic diagram illustrating an example of an operating voltage and an output voltage according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram illustrating another power amplifying circuit for an audio signal according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram illustrating a first power branch according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating an example of a first sine wave signal according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram illustrating an example of a first PWM signal according to an embodiment of the present application;
fig. 8 is a schematic diagram illustrating a second power branch according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of an example of a second sine wave signal provided by an embodiment of the present application;
FIG. 10 is a diagram illustrating an example of a second PWM signal according to an embodiment of the present application;
fig. 11 is a schematic diagram illustrating a power module according to an embodiment of the present disclosure;
fig. 12 is a schematic diagram illustrating another power amplifier circuit for audio signals according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present application;
fig. 14 is a schematic diagram of an example of a terminal device in the prior art;
fig. 15 is a schematic diagram of an example of a terminal device according to an embodiment of the present application;
fig. 16 is a flowchart of a method for amplifying power of an audio signal according to an embodiment of the present disclosure;
fig. 17 is a flowchart of another method for amplifying power of an audio signal according to an embodiment of the present application;
fig. 18 is a flowchart of another method for amplifying power of an audio signal according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first" and "second," and the like, in the description and in the claims of the embodiments of the present application are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first power branch and the second power branch, etc. are used to distinguish between different power branches, rather than to describe a particular sequence of operational instructions. In the description of the embodiments of the present application, the meaning of "a plurality" means two or more unless otherwise specified.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
The embodiment of the application provides a power amplification circuit, a method and a terminal device of an audio signal, which can reduce power loss while resisting interference, thereby improving amplification efficiency in the audio signal amplification process.
In a first embodiment of the present application, fig. 1 illustrates a power amplification circuit for an audio signal provided in an embodiment of the present application. As shown in fig. 1, the power amplification circuit 1 of the audio signal may include: a power supply module 01 and a power amplifier 02.
The input end of the power supply module 01 is used for connecting an audio signal input device; the output end of the power module 01 is connected with the power end of the power amplifier 02, and is used for inputting a working voltage to the power amplifier 02, controlling the absolute value of the working voltage to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier 02, and controlling the absolute value of the difference between the working voltage and the output voltage to be within a preset range.
The power amplifier 02 may be a class AB power amplifier or a class a power amplifier. The input end of the power amplifier 02 is used for connecting an audio signal input device and for performing power amplification on an audio signal according to the working voltage.
Optionally, the power module 01 in this embodiment of the application may be a switching power supply circuit, a buck converter circuit, or a boost chopper circuit.
Optionally, the preset range in the embodiment of the present application may be 0.1V to 0.2V.
For example, the power amplifier is a class AB power amplifier, and the sine wave is taken as an example. In the prior art, as shown in fig. 2, the operating voltage input from the output terminal of the power module to the class AB power amplifier is ± V1, the operating voltage (i.e. output voltage) used by the class AB power amplifier when amplifying the audio signal is ± V2, part a1 in fig. 2 is useless thermal power, part a2 is effective power, and the power amplifier efficiency when amplifying the audio signal is ± V1
In the embodiment of the present application, as shown in fig. 3, the operating voltage input from the output terminal of the power module 01 to the class AB power amplifier is ± V3, the output voltage of the class AB power amplifier is ± V2, and the difference between V3 and V2 is 0.1V, part a3 in fig. 3 (a 3)<a1) For useless heating power, the part a2 is effective power, and the power amplifier efficiency when amplifying audio signal is
Due to a3<a1, it can thus be seen that
That is, when amplifying an audio signal, the power amplification efficiency in the embodiment of the present application is greater than the power amplification efficiency in the prior art.
For example, when the preset range in the embodiment of the present application is 0.1V, the power amplification efficiency is maximum when the audio signal is amplified, and no distortion occurs.
For example, if the output voltage V2 of the class AB power amplifier is 4V and the input operating voltage V3 is 4.1V, the power amplifier efficiency is equal to
The power module 01 is a switching power supply, the power efficiency is about 90%, and the total efficiency when amplifying the audio signal is 97.6% × 90% and 87.8%, it can be seen that when the class AB power amplifier is used to amplify the audio signal, the total efficiency in the embodiment of the present application is greater than that in the prior art (about 50%), and is almost the same as that when the class D power amplifier is used (about 90%).
The embodiment of the application provides a power amplification circuit of an audio signal, which adopts an AB type power amplifier or an A type power amplifier, so that the power amplification circuit has better anti-interference capability; in addition, the power supply module can control the working voltage input to the power amplifier to enable the absolute value of the difference between the working voltage and the output voltage of the power amplifier to be within a preset range, and useless thermal power generated by the power supply module is very small at the moment, so that power loss is reduced, and the amplification efficiency in the audio signal amplification process is improved.
Optionally, in an implementation manner of the embodiment of the present application, with reference to fig. 1, as shown in fig. 4, another power amplifying circuit for an audio signal provided in the embodiment of the present application is shown. Specifically, the power supply module 01 in fig. 4 may include a first power supply branch 10 and a second power supply branch 20, and the power amplifier 02 is a class AB power amplifier.
The input end of the first power supply branch 10 is used for connecting an audio signal input device, and the output end of the first power supply branch 10 is connected with the first power supply end of the class AB power amplifier. The input end of the first power supply branch 10 is configured to input a first working voltage to the class AB power amplifier, and control the first working voltage to be greater than a first output voltage according to the first output voltage of the class AB power amplifier, where an absolute value of a difference between the first working voltage and the first output voltage is within a preset range.
Wherein, the input end of the second power supply branch 20 is used for connecting the audio signal input device, and the output end of the second power supply branch 20 is connected with the second power supply end of the class AB power amplifier. The input end of the second power supply branch 20 is configured to input a second working voltage to the class AB power amplifier, and control an absolute value of the second working voltage to be greater than an absolute value of the second output voltage according to the second output voltage of the class AB power amplifier, where an absolute value of a difference between the second working voltage and the second output voltage is within a preset range.
The input end of the AB type power amplifier is used for being connected with an audio signal input device.
For example, the first power supply branch 10 in the embodiment of the present application may be a positive power supply module, and the first power supply terminal of the class AB power amplifier may be a positive power supply terminal. The first power supply branch 10 inputs a first working voltage + V3 (namely V3, V3>0) to the AB class power amplifier, and controls V3 to be larger than V2 according to the first output voltage + V2 (namely V2, V2 is larger than or equal to 0) of the AB class power amplifier, and the absolute value of the difference between V3 and V2 is within a preset range.
For example, assume that the preset range is 0.1V. The first output voltage of the class AB power amplifier is 4V, and the first working voltage inputted to the class AB power amplifier by the first power supply branch 10 is 4.1V.
For example, the second power supply branch 20 in the embodiment of the present application may be a negative power supply module, and the second power supply terminal of the class AB power amplifier may be a negative power supply terminal. The second power supply branch 20 inputs the second operating voltage-V3 to the class AB power amplifier, and controls the absolute value of-V3 to be greater than the absolute value of-V2 (i.e., V3 is greater than V2) and the absolute value of the difference between-V3 and-V2 to be within a preset range according to the second output voltage-V2 of the class AB power amplifier.
For example, assume that the preset range is 0.1V. The second output voltage of the class AB power amplifier is-4V, and the second working voltage inputted to the class AB power amplifier by the first power supply branch 10 is-4.1V.
Further, the power module 01 in the embodiment of the present application may be a switching power supply circuit. As shown in fig. 5, a first power branch 10 provided by the embodiment of the present application is shown. The first power supply branch 10 includes a forward diode 100, a first comparator 101, a first transistor 102, and a first reduction circuit 103.
A first end of the forward diode 100 is configured to be connected to an audio signal input device, a second end of the forward diode 100 is connected to a first end of the first comparator 101, a second end of the first comparator 101 is connected to a gate of the first transistor 102, a source of the first transistor 102 is connected to a positive power supply Voltage (VCC), a drain of the first transistor 102 is connected to a first end of the first restoring circuit 103, and a second end of the first restoring circuit 103 is connected to a first power supply terminal of the class AB power amplifier.
The forward diode 100 is configured to perform separation processing on the audio signal to obtain a first audio signal.
Illustratively, a sine wave signal is taken as an example. As shown in fig. 6, the forward diode 100 performs a separation process on the sinusoidal signal shown in (1) in fig. 6, and obtains a first sinusoidal signal shown in (2) in fig. 6.
The first comparator 101 is configured to compare the first audio signal to obtain a first Pulse Width Modulation (PWM) signal.
Illustratively, as shown in fig. 5, a third terminal of the first comparator 101 is connected to the first sawtooth generator, and the first comparator 101 is configured to compare the first audio signal with the first sawtooth signal generated by the first sawtooth generator.
Illustratively, as shown in fig. 7, the first comparator 101 compares the first sine wave signal shown in (2) in fig. 6 with the first sawtooth wave signal, and records the first sine wave signal as high level when the first sine wave signal is higher than the first sawtooth wave signal, and records the first sine wave signal as low level when the first sine wave signal is lower than the first sawtooth wave signal, so as to obtain the first PWM signal shown in fig. 7.
The first transistor 102 is configured to amplify the first PWM signal to obtain an amplified first PWM signal; the first transistor 102 is further configured to control a voltage of the amplified first PWM signal to be a first operating voltage according to the first output voltage.
Illustratively, the first transistor 102 may be a Metal-Oxide-Semiconductor (MOS) transistor. The first transistor 102 controls the amplified voltage of the first PWM signal to be the first operating voltage V3 according to the first output voltage V2, V3 is greater than V2, and the absolute value of the difference between V3 and V2 is within a preset range.
In the embodiment of the present application, the first transistor 102 controls the voltage of the amplified first PWM signal to be a first operating voltage, the first operating voltage is greater than the first output voltage, and an absolute value of a difference between the first operating voltage and the first output voltage is within a predetermined range, at this time, the first transistor 102 operates in a saturation region (a voltage drop between a source and a drain of the first transistor 102 is about 0.1V), and useless thermal power is very small.
The first restoring circuit 103 is configured to restore the amplified first PWM signal to obtain an amplified first audio signal; the first restoring circuit 103 is further configured to input the amplified first audio signal of the first operating voltage to the class AB power amplifier.
For example, the first restoring circuit 103 may perform a restoring process such as filtering on the amplified first PWM signal to obtain an amplified first audio signal. The first reduction circuit 103 may include elements such as a forward diode, an inductor, and a capacitor.
As shown in fig. 8, a second power branch 20 provided in the embodiment of the present application is shown. The second power supply branch 20 includes a backward diode 200, a second comparator 201, a second transistor 202, and a second reduction circuit 203.
The first end of the backward diode 200 is used for connecting an audio signal input device, the second end of the backward diode 200 is connected with the first end of the second comparator 201, the second end of the second comparator 201 is connected with the gate of the second transistor 202, the source of the second transistor 202 is connected with negative VCC, the drain of the second transistor 202 is connected with the first end of the second restoring circuit 203, and the second end of the second restoring circuit 203 is connected with the second power supply end of the class AB power amplifier.
The backward diode 200 is configured to separate the audio signal to obtain a second audio signal.
Illustratively, a sine wave signal is taken as an example. As shown in fig. 9, the backward diode 200 performs separation processing on the sine wave signal shown in (1) in fig. 6, and obtains a second sine wave signal shown in fig. 9.
The second comparator 201 is configured to compare the second audio signal to obtain a second PWM signal.
Illustratively, as shown in fig. 8, a third terminal of the second comparator 201 is connected to the second sawtooth wave generator, and the second comparator 201 is configured to compare the second audio signal with a second sawtooth wave signal generated by the second sawtooth wave generator.
Illustratively, as shown in fig. 10, the second comparator 201 compares the second sine wave signal shown in fig. 9 with the second sawtooth wave signal, and records as high level when the second sine wave signal is higher than the second sawtooth wave signal, and records as low level when the second sine wave signal is lower than the second sawtooth wave signal, so as to obtain the second PWM signal shown in fig. 10.
The second transistor 202 is configured to amplify the second PWM signal to obtain an amplified second PWM signal; the second transistor 202 is further configured to control the amplified voltage of the second PWM signal to be a second operating voltage according to the second output voltage.
Illustratively, the second transistor 202 may be a MOS transistor. The second transistor 202 controls the amplified voltage of the second PWM signal to be the second operating voltage-V3-V3 with an absolute value greater than-V2 according to the second output voltage-V2, and the absolute value of the difference between-V3 and-V2 is within a preset range.
In this embodiment, the second transistor 202 controls the amplified second PWM signal to have a second operating voltage, an absolute value of the second operating voltage is greater than an absolute value of the second output voltage, and an absolute value of a difference between the second operating voltage and the second output voltage is within a predetermined range, at this time, the second transistor 202 operates in a saturation region (a voltage drop between a source and a drain of the second transistor 202 is about 0.1V), and useless thermal power is very small.
The second restoring circuit 203 is configured to restore the amplified second PWM signal to obtain an amplified second audio signal; the second restoring circuit 203 is further configured to input the amplified second audio signal of the second operating voltage to the class AB power amplifier.
For example, the second restoring circuit 203 may perform a restoring process such as filtering on the amplified second PWM signal to obtain an amplified second audio signal. The second reduction circuit 203 may include elements such as a reverse diode, an inductor, and a capacitor.
In the embodiment of the present application, referring to fig. 5 and fig. 8, as shown in fig. 11, a power module 01 provided in the embodiment of the present application is shown. The power module 01 includes a first power branch 10 and a second power branch 20. The first power supply branch 10 comprises a forward diode 100, a first comparator 101, a first transistor 102 and a first reduction circuit 103. The second power supply branch 20 comprises a backward diode 200, a second comparator 201, a second transistor 202 and a second reduction circuit 203.
The first end of the forward diode 100 is used for connecting an audio signal input device, the second end of the forward diode 100 is connected with the first end of the first comparator 101, the second end of the first comparator 101 is connected with the grid of the first transistor 102, the third end of the first comparator 101 is connected with the first sawtooth generator, the source of the first transistor 102 is connected with positive VCC, the drain of the first transistor 102 is connected with the first end of the first restoring circuit 103, and the second end of the first restoring circuit 103 is used for connecting the first power supply end of the AB-type power amplifier.
The first end of the backward diode 200 is used for connecting an audio signal input device, the second end of the backward diode 200 is connected with the first end of the second comparator 201, the second end of the second comparator 201 is connected with the grid of the second transistor 202, the third end of the second comparator 201 is connected with the second sawtooth generator, the source of the second transistor 202 is connected with negative VCC, the drain of the second transistor 202 is connected with the first end of the second restoring circuit 203, and the second end of the second restoring circuit 203 is used for connecting the second power supply end of the class AB power amplifier.
In the embodiment of the present application, referring to fig. 4 and fig. 11, as shown in fig. 12, another power amplifying circuit for an audio signal provided in the embodiment of the present application is shown. The power amplification circuit 1 for audio signals comprises a power module 01 and an AB power amplifier. The power module 01 includes a first power branch 10 and a second power branch 20. The first power supply branch 10 comprises a forward diode 100, a first comparator 101, a first transistor 102 and a first reduction circuit 103. The second power supply branch 20 comprises a backward diode 200, a second comparator 201, a second transistor 202 and a second reduction circuit 203.
It should be noted that the power module in the embodiment of the present application may also be another switching power module, and the embodiment of the present application is not limited herein.
It should be noted that the "±" symbol in the embodiment of the present application indicates positive or negative, for example, the output voltage is ± V2, which indicates the output voltage is + V2 (i.e., V2) or-V2.
Optionally, in another implementation manner of the embodiment of the present application, the power module 01 may only include the third power supply branch 30, and the power amplifier is a class a power amplifier.
Wherein, the input end of the third power supply branch 30 is used for connecting the audio signal input device, and the output end of the third power supply branch 30 is connected with the power supply end of the class a power amplifier. The input end of the third power supply branch 30 is configured to input a third operating voltage to the class-a power amplifier, and control an absolute value of the third operating voltage to be greater than an absolute value of the third output voltage according to the third output voltage of the class-a power amplifier, where an absolute value of a difference between the third operating voltage and the third output voltage is within a preset range. The input end of the A-type power amplifier is used for being connected with an audio signal input device.
In a second embodiment of the present application, fig. 13 illustrates a terminal device provided in the embodiment of the present application. As shown in fig. 13, the terminal device 1300 may include: at least one audio signal output device 1301 and a power amplification circuit 1 of an audio signal.
The power amplification circuit 1 of the audio signal is used for driving at least one audio signal output device 1301, so that the at least one audio signal output device 1301 outputs the amplified audio signal.
Illustratively, the at least one audio signal output device 1301 may be at least one speaker.
Compared with the prior art, in the terminal device provided by the embodiment of the present application, the layout of the power amplifying circuit 1 for the audio signal is flexible, and is not limited to the vicinity of the speaker, and especially, the effect is better and outstanding when the terminal device includes a plurality of (more than one) speakers. The following detailed description is made with reference to the accompanying drawings. Fig. 14 and 15 show a terminal device 1300 in the related art and a terminal device 1300 in the embodiment of the present application, respectively.
Illustratively, as shown in fig. 14, when a terminal device 1300 in the related art includes a plurality of (only two are shown in fig. 14 as an example) speakers (i.e., a speaker 1 and a speaker 2), a corresponding number of power amplification circuits for audio signals (a power amplification circuit 2 for audio signals and a power amplification circuit 3 for audio signals in fig. 14) are required. The power amplification circuit 2 of the audio signal comprises a D-type power amplifier 1, the power amplification circuit 3 of the audio signal comprises a D-type power amplifier 2, the D-type power amplifier 1 is connected with the loudspeaker 1, and the D-type power amplifier 2 is connected with the loudspeaker 2.
Illustratively, as shown in fig. 15, the terminal device 1300 according to the embodiment of the present application may employ one power amplification circuit of an audio signal (power amplification circuit 1 of an audio signal in fig. 15) when there are a plurality of speakers (only two are shown in fig. 15 as an example) (i.e., speaker 1 and speaker 2). The power amplification circuit 1 for the audio signal includes a class AB power amplifier (or a class a power amplifier), and the class AB power amplifier is connected to the speaker 1 and the speaker 2, respectively.
In the prior art, when the terminal device 1300 includes a plurality of (more than one) speakers, because the interference is large when the class D power amplifier is used, the class D power amplifier can only be close to the position of the speaker, and a plurality of class D power amplifiers are required to drive the speakers, the layout of the class D power amplifier in the terminal device 1300 is complicated, and the cost is high.
In the embodiment of the present application, when the terminal device 1300 includes a plurality of speakers, since the class AB power amplifier in the power amplification circuit 1 for audio signals has a strong anti-interference capability, and the class AB power amplifier can be connected to a speaker at a far position to drive the speaker, one class AB power amplifier can drive a plurality of speakers, thereby simplifying the layout of the power amplifiers and saving the cost; in addition, the power module 01 in the power amplification circuit 1 of the audio signal controls the working voltage input to the class AB power amplifier, so that the absolute value of the difference between the working voltage and the output voltage of the class AB power amplifier is within a preset range, and at this time, the useless thermal power generated by the power module 01 is very small, thereby reducing the power loss and improving the amplification efficiency in the amplification process of the audio signal.
In a third embodiment of the present application, fig. 16 illustrates a power amplification method for an audio signal provided in an embodiment of the present application, which can be applied to a power amplification circuit for an audio signal as described in any one of fig. 1, fig. 4, and fig. 12. As shown in fig. 16, the power amplification method of the audio signal includes S1601 and S1602:
s1601, the power supply module inputs working voltage to the power amplifier.
The power amplifier may be a class AB power amplifier or a class a power amplifier.
S1602, the power supply module controls the absolute value of the working voltage to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range.
The power amplifier can amplify the power of the audio signal according to the working voltage.
The embodiment of the application provides a power amplification method of an audio signal, and as the power amplification circuit of the audio signal adopts an AB type power amplifier or an A type power amplifier, the power amplification circuit has better anti-jamming capability; in addition, the power supply module can control the working voltage input to the power amplifier to enable the absolute value of the difference between the working voltage and the output voltage of the power amplifier to be within a preset range, and useless thermal power generated by the power supply module is very small at the moment, so that power loss is reduced, and the amplification efficiency in the audio signal amplification process is improved.
Optionally, in this embodiment of the application, with reference to fig. 16, as shown in fig. 17, the S1601 may be specifically implemented by S1601a and S1601 b:
s1601a, the power module inputs a first working voltage to the AB class power amplifier through the first power supply branch.
And S1601b, inputting a second working voltage to the AB class power amplifier by the power supply module through the second power supply branch.
Correspondingly, in this embodiment of the application, with reference to fig. 16, as shown in fig. 17, the S1602 may specifically be implemented by the S1602a and the S1602 b:
s1602a, the power module controls, through the first power branch, the first working voltage to be greater than the first output voltage according to the first output voltage of the class AB power amplifier, and an absolute value of a difference between the first working voltage and the first output voltage is within a preset range.
S1602b, the power supply module controls, through the second power supply branch, that the absolute value of the second working voltage is greater than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier, and the absolute value of the difference between the second working voltage and the second output voltage is within a preset range.
Optionally, in this embodiment of the application, with reference to fig. 16, as shown in fig. 18, the S1601 may specifically be implemented by S1601 c:
s1601c, the power module inputs a third operating voltage to the class a power amplifier via a third power supply branch.
Correspondingly, in this embodiment of the application, with reference to fig. 16, as shown in fig. 18, the above S1602 may specifically be implemented by the S1602 c:
s1602c, the power supply module controls, through the third power supply branch, that an absolute value of the third working voltage is greater than an absolute value of the third output voltage according to the third output voltage of the class-a power amplifier, and an absolute value of a difference between the third working voltage and the third output voltage is within a preset range.
It should be noted that, for specific description of related method steps in the method for amplifying a power of an audio signal provided in the embodiment of the present application, reference may be made to related description of a power amplifying circuit of an audio signal in the embodiment of the present application, and details are not repeated here.
It should be noted that, in the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A power amplification circuit for an audio signal, comprising:
the power amplifier is an AB type power amplifier or an A type power amplifier, and the power module comprises one power branch or two power branches;
the input end of each power branch of the power module is used for connecting an audio signal input device; for each power supply branch of the power supply module, an output end of each power supply branch is connected with one power supply end of the power amplifier, and is used for inputting a working voltage to the power amplifier, controlling an absolute value of the working voltage to be larger than an absolute value of the output voltage according to the output voltage of the power amplifier, and controlling an absolute value of a difference between the working voltage and the output voltage to be within a preset range;
and the input end of the power amplifier is connected with the audio signal input device and used for carrying out power amplification on the audio signal according to the working voltage of each power supply branch.
2. The power amplifier circuit for audio signals according to claim 1, wherein the power supply module comprises two power supply branches, the two power supply branches are a first power supply branch and a second power supply branch, and the power amplifier is the class AB power amplifier;
the input end of the first power supply branch is used for being connected with the audio signal input device, the output end of the first power supply branch is connected with a first power supply end of the AB class power amplifier, and the first power supply branch is used for inputting a first working voltage to the AB class power amplifier, controlling the first working voltage to be larger than the first output voltage according to the first output voltage of the AB class power amplifier, and the absolute value of the difference between the first working voltage and the first output voltage is within a preset range;
the input end of the second power supply branch is used for connecting the audio signal input device, the output end of the second power supply branch is connected with a second power supply end of the class AB power amplifier, and the second power supply branch is used for inputting a second working voltage to the class AB power amplifier, controlling the absolute value of the second working voltage to be larger than the absolute value of the second output voltage according to the second output voltage of the class AB power amplifier, and controlling the absolute value of the difference between the second working voltage and the second output voltage to be within a preset range;
the input end of the AB class power amplifier is used for being connected with the audio signal input device.
3. The power amplifier circuit for amplifying an audio signal according to claim 1, wherein the power supply module comprises a power supply branch, the power supply branch is a third power supply branch, and the power amplifier is the class a power amplifier;
the input end of the third power supply branch is used for connecting the audio signal input device, the output end of the third power supply branch is connected with the power supply end of the class-A power amplifier, and is used for inputting a third working voltage to the class-A power amplifier, controlling the absolute value of the third working voltage to be larger than the absolute value of the third output voltage according to the third output voltage of the class-A power amplifier, and the absolute value of the difference between the third working voltage and the third output voltage is within a preset range;
the input end of the A-type power amplifier is used for being connected with the audio signal input device.
4. The power amplifier circuit for audio signals according to claim 2, wherein the first power supply branch comprises a forward diode, a first comparator, a first transistor and a first restoring circuit;
the first end of the forward diode is used for connecting the audio signal input device, the second end of the forward diode is connected with the first end of the first comparator, the second end of the first comparator is connected with the grid electrode of the first transistor, the source electrode of the first transistor is connected with a positive power supply voltage VCC, the drain electrode of the first transistor is connected with the first end of the first restoring circuit, and the second end of the first restoring circuit is connected with the first power supply end of the AB class power amplifier;
the forward diode is used for separating the audio signal to obtain a first audio signal;
the first comparator is used for comparing the first audio signal to obtain a first Pulse Width Modulation (PWM) signal;
the first transistor is used for amplifying the first PWM signal to obtain an amplified first PWM signal, and controlling the voltage of the amplified first PWM signal to be a first working voltage according to the first output voltage;
the first restoring circuit is configured to restore the amplified first PWM signal to obtain an amplified first audio signal, and is configured to input the amplified first audio signal of the first operating voltage to the class AB power amplifier.
5. The power amplifier circuit for audio signals according to claim 2, wherein the second power supply branch comprises a backward diode, a second comparator, a second transistor and a second restoring circuit;
the first end of the backward diode is used for being connected with the audio signal input device, the second end of the backward diode is connected with the first end of the second comparator, the second end of the second comparator is connected with the grid electrode of the second transistor, the source electrode of the second transistor is connected with negative VCC, the drain electrode of the second transistor is connected with the first end of the second reduction circuit, and the second end of the second reduction circuit is connected with the second power supply end of the AB class power amplifier;
the backward diode is used for separating the audio signal to obtain a second audio signal;
the second comparator is used for comparing the second audio signal to obtain a second PWM signal;
the second transistor is used for amplifying the second PWM signal to obtain an amplified second PWM signal, and controlling the voltage of the amplified second PWM signal to be a second working voltage according to the second output voltage;
the second restoring circuit is configured to restore the amplified second PWM signal to obtain an amplified second audio signal, and is configured to input the amplified second audio signal of the second operating voltage to the class AB power amplifier.
6. A power amplification method of an audio signal is applied to a power amplification circuit of the audio signal which comprises a power supply module and a power amplifier, wherein the power amplifier is a class AB power amplifier or a class A power amplifier, the power supply module comprises a power supply branch or two power supply branches, the input end of each power supply branch of the power supply module is connected with an audio signal input device, the output end of each power supply branch of the power supply module is connected with a power supply end of the power amplifier, and the input end of the power amplifier is connected with the audio signal input device, and the method comprises the following steps:
for each power branch of the power supply module, the power supply module inputs an operating voltage to the power amplifier;
the power supply module controls the absolute value of the working voltage to be larger than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range, so that the power amplifier amplifies the power of the audio signal according to the working voltage of each power supply branch.
7. The method of claim 6, wherein the power supply module inputs an operating voltage to the power amplifier, comprising:
the power supply module inputs a first working voltage to the AB class power amplifier through a first power supply branch;
the power supply module inputs a second working voltage to the AB class power amplifier through a second power supply branch;
correspondingly, the power module controls the absolute value of the working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range, including:
the power supply module controls the first working voltage to be larger than the first output voltage according to the first output voltage of the AB class power amplifier through a first power supply branch circuit, and the absolute value of the difference between the first working voltage and the first output voltage is within a preset range;
and the power supply module controls the absolute value of the second working voltage to be greater than the absolute value of the second output voltage according to the second output voltage of the AB type power amplifier through a second power supply branch circuit, and the absolute value of the difference between the second working voltage and the second output voltage is within a preset range.
8. The method of claim 6, wherein the power supply module inputs an operating voltage to the power amplifier, comprising:
the power supply module inputs a third working voltage to the class-A power amplifier through a third power supply branch;
correspondingly, the power module controls the absolute value of the working voltage to be greater than the absolute value of the output voltage according to the output voltage of the power amplifier, and the absolute value of the difference between the working voltage and the output voltage is within a preset range, including:
and the power supply module controls the absolute value of the third working voltage to be greater than the absolute value of the third output voltage according to the third output voltage of the class-A power amplifier through a third power supply branch, and the absolute value of the difference between the third working voltage and the third output voltage is within a preset range.
9. A terminal device, characterized in that the terminal device comprises:
at least one audio signal output device and a power amplification circuit for an audio signal according to any one of claims 1 to 5;
the power amplifying circuit of the audio signal is used for driving the at least one audio signal output device, so that the at least one audio signal output device outputs the amplified audio signal.
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| CN201711217730.7A CN107888150B (en) | 2017-11-28 | 2017-11-28 | Power amplification circuit and method for audio signal and terminal equipment |
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| CN201711217730.7A CN107888150B (en) | 2017-11-28 | 2017-11-28 | Power amplification circuit and method for audio signal and terminal equipment |
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| CN107888150B true CN107888150B (en) | 2020-06-30 |
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| CN2796245Y (en) * | 2005-06-10 | 2006-07-12 | 李达标 | Power amplication circuit for power output wave form capable of automatic tracking input audio frequency signal wave form |
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| CN106817094A (en) * | 2017-01-19 | 2017-06-09 | 中国科学院上海高等研究院 | A kind of radio frequency low-noise amplifier and its implementation |
| JP2018107974A (en) * | 2016-12-27 | 2018-07-05 | パナソニックＩｐマネジメント株式会社 | Switching power supply device and audio device |
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| CN2796245Y (en) * | 2005-06-10 | 2006-07-12 | 李达标 | Power amplication circuit for power output wave form capable of automatic tracking input audio frequency signal wave form |
| US9220067B2 (en) * | 2011-05-02 | 2015-12-22 | Rf Micro Devices, Inc. | Front end radio architecture (FERA) with power management |
| CN203491978U (en) * | 2013-06-27 | 2014-03-19 | 快捷半导体(苏州)有限公司 | Output stage circuit, class AB amplifier and electronic device |
| JP2018107974A (en) * | 2016-12-27 | 2018-07-05 | パナソニックＩｐマネジメント株式会社 | Switching power supply device and audio device |
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