CN116633276A - Power supply voltage control method, audio power amplification system, electronic equipment and chip - Google Patents

Power supply voltage control method, audio power amplification system, electronic equipment and chip Download PDF

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Publication number
CN116633276A
CN116633276A CN202310720796.7A CN202310720796A CN116633276A CN 116633276 A CN116633276 A CN 116633276A CN 202310720796 A CN202310720796 A CN 202310720796A CN 116633276 A CN116633276 A CN 116633276A
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amplitude
voltage
audio
power amplifier
determining
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程立
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Shanghai Awinic Technology Co Ltd
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Shanghai Awinic Technology Co Ltd
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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
    • H03F1/0216—Continuous control
    • H03F1/0222—Continuous control by using a signal derived from the input signal
    • H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters
    • 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
    • H03F1/32—Modifications of amplifiers to reduce non-linear distortion
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Multimedia (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

The application relates to the technical field of electronics, and discloses a power supply voltage control method, an audio power amplification system, electronic equipment and a chip. The method is applied to an audio power amplifier system and comprises the following steps: acquiring audio data input into an audio power amplifier system; determining an input amplitude of the audio data; determining a control voltage according to the input amplitude; and adjusting the power amplifier supply voltage based on the control voltage to supply power to the power amplifier of the audio power amplifier system based on the power amplifier supply voltage. According to the input amplitude of the audio data, the power supply voltage of the power amplifier of the audio power amplification system is determined, the audio data is amplified according to the power supply voltage, and under the condition that the audio signal is ensured not to generate truncated distortion, the power consumption of the audio power amplification system is reduced, and the conversion efficiency is improved.

Description

Power supply voltage control method, audio power amplification system, electronic equipment and chip
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a power supply voltage control method, an audio power amplifier system, an electronic device, and a chip.
Background
Currently, in audio devices, a power amplifier is generally required to amplify and restore input audio data, and in the operation process of the power amplifier, the power amplifier needs to provide electric energy required by the operation of the audio device. Since the supply voltage of the audio device is limited, the supply voltage is typically boosted to a higher level voltage by a direct current-to-direct current (direct current to direct current convertor, DC-DC) voltage converter to power the power amplifier. To prevent clipping of the power amplifier output signal, resulting in truncated distortion, the power amplifier supply voltage is typically a fixed voltage value above the level of the audio data.
In actual operation, in order to meet the maximum power output of the audio power amplifier, the voltage value of the power supply voltage of the power amplifier is usually a larger fixed voltage value. The input audio data is usually audio data with continuously changing amplitude, and the output power is also different. When the output power is lower, if the voltage value of the power supply voltage of the power amplifier is too high, the power amplifier quiescent operating current can cause larger power consumption loss, and the power amplifier conversion efficiency is reduced.
Disclosure of Invention
The application aims to provide a power supply voltage control method, an audio power amplification system, electronic equipment and a chip.
A first aspect of the present application provides a supply voltage control method applied to an audio power amplifier system, which is characterized by comprising: acquiring audio data input into an audio power amplifier system; determining an input amplitude of the audio data; determining a control voltage corresponding to the input amplitude according to the input amplitude; and determining the power amplifier supply voltage corresponding to the input amplitude based on the control voltage.
According to the power supply voltage control method provided by the application, the power supply voltage of the power amplifier corresponding to the audio data is determined according to the input amplitude of the audio data, and the audio data is amplified according to the power supply voltage of the power amplifier, so that the power consumption of an audio power amplifier system can be reduced and the conversion efficiency can be improved under the condition that the audio data is ensured not to generate truncated distortion.
In a possible implementation manner of the first aspect, determining, according to the input amplitude, a control voltage corresponding to the input amplitude includes: determining an amplitude gain and a voltage residual value of the audio data; determining an output amplitude corresponding to the input amplitude according to the input amplitude and the amplitude gain; determining a required supply voltage based on the output amplitude and the voltage residual value; determining an analog voltage control signal based on the required supply voltage; based on the analog voltage control signal, a control voltage is determined.
In a possible implementation of the first aspect, determining the control voltage based on the analog voltage control signal includes: determining the power supply voltage of an audio power amplifier system; the control voltage is determined based on the analog voltage control signal and a supply voltage of the audio power amplifier system.
It is understood that the power supply voltage of the audio power amplifier system herein refers to the power supply voltage required by the audio power amplifier system.
In a possible implementation manner of the first aspect, determining, based on the control voltage, a power supply voltage of the power amplifier corresponding to the input amplitude includes: determining feedback voltage of a voltage converter of the audio power amplification system, wherein the feedback voltage is equal to reference voltage of the voltage converter of the audio power amplification system; and determining the power amplifier supply voltage based on the feedback voltage and the control voltage.
It is understood that reference voltage of the voltage converter herein refers to reference voltage inside the voltage converter.
In a possible implementation manner of the first aspect, determining, according to the input amplitude, a control voltage corresponding to the input amplitude further includes: when the audio power amplification system continuously detects N input amplitudes, determining the starting time and the ending time corresponding to each input amplitude, wherein N is an integer greater than 1; determining an ith input amplitude as a first amplitude, and determining an (i+1) th input amplitude as a second amplitude, wherein i is an integer greater than 0 and less than N; when the second amplitude is larger than or equal to the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be smaller than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier power supply voltage corresponding to the second amplitude is smaller than the starting time corresponding to the second amplitude; when the second amplitude is smaller than the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be larger than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier power supply voltage corresponding to the second amplitude is larger than the starting time corresponding to the second amplitude.
In a possible implementation of the first aspect, the analog voltage control signal is a digital control signal of M bits, M being an integer greater than 1.
A second aspect of the present application provides an audio power amplifier system, comprising: the power supply voltage control path is used for acquiring audio data input into the audio power amplification system, determining the input amplitude of the audio data, and determining the control voltage corresponding to the input amplitude according to the input amplitude; the power amplifier power supply voltage module is used for determining the power amplifier power supply voltage based on the control voltage; and the power amplifier is used for amplifying the analog audio signal based on the power amplifier supply voltage and determining the amplified analog audio signal.
In a possible implementation manner of the second aspect, the audio power amplifier system further includes: the delay unit is used for carrying out delay processing on the audio data to obtain delay audio data; a first processing unit for performing audio processing on the delayed audio data; the first digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the audio data subjected to audio processing to obtain an analog audio signal, and inputting the analog audio signal into the power amplifier.
In one possible implementation manner of the second aspect, the power amplifier supply voltage module includes: the resistor network is used for determining the feedback voltage of the voltage converter of the audio power amplifier system; and the voltage converter is used for determining the power amplifier supply voltage based on the feedback voltage and the control voltage.
In a possible implementation of the second aspect, the voltage control path includes: a signal amplitude detector for determining an input amplitude of the audio data; the second processing unit is used for determining the amplitude gain and the voltage residual value of the audio data, and determining the output amplitude corresponding to the input amplitude according to the input amplitude and the amplitude gain; determining a required supply voltage based on the output amplitude and the voltage residual value; determining an analog voltage control signal based on the required supply voltage; the second digital-to-analog conversion module is used for determining the control voltage based on the analog voltage control signal.
A third aspect of the application provides an electronic device comprising a processor and a memory, the memory for storing program instructions, the processor for invoking the program instructions to perform any of the methods of the first aspect above.
A fourth aspect of the application provides a chip comprising a processor and a data interface, the processor reading instructions stored on a memory via the data interface to perform any of the methods of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic diagram of an audio signal truncated distortion;
FIG. 2 shows a schematic diagram of an audio power amplifier system;
FIG. 3 shows a flow chart of a supply voltage control method according to an embodiment of the application;
FIG. 4 illustrates a schematic diagram of acquiring input amplitude in accordance with an embodiment of the present application;
FIG. 5 shows a schematic diagram of waveforms of audio data and delayed audio data, according to an embodiment of the present application;
fig. 6 shows waveforms of audio data and audio data output from the audio power amplifier system 100 according to an embodiment of the present application;
fig. 7 shows a schematic structural diagram of an audio power amplifier system 100 according to an embodiment of the present application;
FIG. 8 shows a schematic diagram of a delay cell according to an embodiment of the application;
FIG. 9 shows a schematic diagram of a signal amplitude detector, according to an embodiment of the application;
FIG. 10 shows a schematic diagram of a digital processing unit, according to an embodiment of the application;
FIG. 11 shows a block diagram of a second digital to analog converter, according to an embodiment of the application;
fig. 12 is a schematic diagram showing a circuit configuration of another second digital-to-analog converter according to an embodiment of the present application.
Detailed Description
Illustrative embodiments of the application include, but are not limited to, a supply voltage control method, an audio power amplifier system, an electronic device, and a chip.
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and thoroughly described with reference to the accompanying drawings.
As described above, in an audio device, a power amplifier is generally required to amplify and restore input audio data, and the power amplifier is required to supply power required for operation of the audio device during operation. Since the supply voltage of the audio device is limited, the supply voltage is typically boosted to a higher level voltage by a DC-DC voltage converter to power the power amplifier. To prevent clipping of the power amplifier output voltage, resulting in truncated distortion, the power amplifier supply voltage is typically a fixed voltage value above the level of the audio data. Referring to the schematic diagram of the truncated distortion of the audio signal shown in fig. 1, the abscissa represents time, the ordinate represents amplitude, M represents audio data, a/-a represents voltage clipping, and the amplitude of the portions of the audio data M from point a to point B and from point C to point D exceeds the voltage clipping, clipping occurs, resulting in truncated distortion of the audio data M.
Fig. 2 shows a schematic diagram of an audio power amplifier system. As shown in fig. 2, the audio power amplifier system 10 includes: a DC-DC voltage converter, an audio power amplifier unit AMP and a speaker. Wherein the DC-DC voltage converter is used for converting the battery voltage V BAT Boosting or stepping down to produce V BST The voltage is supplied to the audio power amplifier unit AMP. Typically, a DC-DC voltage converter generates V BST The voltage is a fixed voltage value, V for satisfying the maximum power output of the audio power amplifier unit AMP BST The voltage needs to be high enough.
However, in practiceIn operation, the input audio data is usually audio data with continuously varying amplitude, and the output power of the audio power amplifier AMP is also different. When the output power is high, V BST The conversion efficiency of the voltage will be correspondingly higher, however, when the output power is lower, V BST The voltage is too high, namely, the voltage difference between the power supply voltage of the power amplifier and the actual working voltage value is too large, the power loss can be large, and the conversion efficiency of the power amplifier is low.
In order to solve the above problems, an embodiment of the present application provides a supply voltage control method, which is applied to an audio power amplifier system, and the method includes: acquiring audio data input into an audio power amplifier system; determining an input amplitude of the audio data; determining a control voltage corresponding to the input amplitude according to the input amplitude; and determining the power amplifier supply voltage corresponding to the input amplitude based on the control voltage. It can be understood that the amplitude of the audio data is continuously changed, and by acquiring the input amplitude of the audio data, the corresponding power amplifier supply voltage can be determined according to the amplitude of the audio signal. For example, assuming that the audio signal amplitude is 3V, the power supply voltage of the power amplifier corresponding to the audio signal is determined to be 4V. For another example, assuming that the amplitude of the audio signal is 5V, the power supply voltage of the power amplifier corresponding to the audio signal is determined to be 6V.
According to the power supply voltage control method provided by the embodiment of the application, the power supply voltage of the power amplifier corresponding to the audio data is determined according to the input amplitude of the audio data, and the audio data is amplified according to the power supply voltage of the power amplifier.
It is understood that, in processing audio data, the power amplifier supply voltage is determined according to the input amplitude of the audio data, and the voltage difference between the actual audio signal amplitude value (the analog audio signal amplitude corresponding to the audio data) is small.
Therefore, according to the power supply voltage control method provided by the embodiment of the application, the corresponding power amplifier power supply voltage is determined according to the input amplitude of the audio data, so that the input amplitude is changed, and the corresponding power amplifier power supply voltage is also changed. It can be understood that the power amplifier supply voltage is not a fixed voltage value, but a voltage value which changes according to an actual working voltage value, so that the voltage difference between the power amplifier supply voltage and the actual working voltage value can be reduced, the power consumption of the audio power amplifier system is reduced under the condition that the audio signal is ensured not to generate truncated distortion, and the conversion efficiency is improved.
In some embodiments, the audio power amplifier system determines an analog voltage control signal corresponding to the input amplitude according to the input amplitude of the audio data, and determines the control voltage based on the analog voltage control signal.
In some embodiments, the audio power amplifier system determines an output amplitude corresponding to the input amplitude from the input amplitude and the amplitude gain, determines a required supply voltage based on the output amplitude and a preset voltage residual value, and determines an analog voltage control signal based on the required supply voltage.
In some embodiments, the audio power amplifier system delays the audio data to obtain delayed audio data; and performing audio processing on the delayed audio data to obtain an analog audio signal.
It can be appreciated that the audio data is delayed, so that the audio data output by the power amplifier in the audio power amplifier system is delayed to the analog voltage control signal, so that the audio power amplifier system determines the power supply voltage of the power amplifier before the audio data is output by the power amplifier, so as to prevent the audio data from generating truncated distortion.
In some embodiments, the audio power amplification system determines a control voltage corresponding to the input amplitude according to the input amplitude, and further includes: when the audio power amplification system continuously detects N input amplitudes, determining the starting time and the ending time corresponding to each input amplitude, wherein N is an integer greater than 1; determining an ith input amplitude as a first amplitude, and determining an (i+1) th input amplitude as a second amplitude, wherein i is an integer greater than 0 and less than N; when the second amplitude is larger than or equal to the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be smaller than the starting time corresponding to the second amplitude, so that the starting time corresponding to the power amplifier power supply voltage corresponding to the second amplitude is smaller than the starting time corresponding to the second amplitude; when the second amplitude is smaller than the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be larger than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier power supply voltage corresponding to the second amplitude is larger than the starting time corresponding to the second amplitude.
It can be understood that when the input amplitude is detected to be large, an analog voltage control signal is output in advance, and the power amplifier supply voltage corresponding to the input amplitude is determined; when the input amplitude is detected to be smaller, the analog voltage control signal is output in a lagging way, and the power amplifier supply voltage corresponding to the input amplitude is determined. The effects of fast entering and slow exiting can be achieved, and the problem of distortion caused by untimely adjustment of the power supply voltage in the working process of the audio power amplifier can be prevented.
In order to better understand the technical solutions of the embodiments of the present application, some technical solutions of the present application are described in detail below.
Fig. 3 shows a schematic flow chart of a supply voltage control method according to an embodiment of the application. It is understood that the main execution body of each step in the flowchart shown in fig. 3 is the audio power amplifier system 100. In order to simplify the description, the execution subject of each step will not be repeated in the description of each step of the flow shown in fig. 3. As shown in fig. 3, the process includes, but is not limited to, the following steps:
s301: audio data input to the audio power amplifier system 100 is acquired.
In some embodiments, the audio power amplifier system 100 receives a digital audio signal input by an integrated circuit built-in audio bus (I2S) interface as audio data input to the audio power amplifier system 100.
S302: an input amplitude of the audio data is determined.
In some embodiments, the audio power amplification system 100 divides the audio data into sub-audio data of n time intervals, obtains audio amplitudes of the sub-audio data in each time interval, and uses the maximum audio amplitude in each time interval as the input amplitude of the corresponding time interval.
Referring to fig. 4 for exemplary purposes, fig. 4 shows a schematic diagram of obtaining input amplitudes for various time intervals according to an embodiment of the application. As shown in fig. 4, the input signal Vin represents audio data, i.e., a numberWord audio signal, detection time window representing time interval, signal amplitude V amp_in Representing the input amplitude for the corresponding time interval. It will be appreciated that the time window T is detected 1 Is of the input amplitude V of (2) amp_in ＝V amp_in1 I.e. V amp_in1 Is a detection time window T 1 Maximum audio amplitude of the audio data within; v (V) amp_in2 Is a detection time window T 2 Maximum audio amplitude of the audio data within; v (V) amp_in(n-1) Is a detection time window T (n-1) Maximum audio amplitude of the audio data within; detection time window T n Maximum audio amplitude of the audio data within.
In some embodiments, the length of each time interval may be 100us. In other embodiments, the length of each time interval may be 1ms, which is not limited by the present application. It is understood that the number n of time intervals is an integer greater than 0.
It will be appreciated that in the embodiments of the present application, only examples of the input amplitude of the audio data are determined by determining the input amplitude of each time interval. In other alternative embodiments, the input amplitude of the audio data may also be determined by other methods, such as detecting the audio amplitude of the audio data in real time, as an input amplitude, etc., which the present application is not limited to.
S303: and determining a control voltage corresponding to the input amplitude according to the input amplitude.
In some embodiments, the audio power amplifier system 100 is based on the input amplitude V amp_in And a preset amplitude GAIN GAIN, determining a corresponding analog voltage control signal, and determining a control voltage based on the analog voltage control signal.
In some embodiments, the analog voltage control signal may be a multi-bit digital control signal.
In some embodiments, it is assumed that the amplitude of the audio data output by the power amplifier in the audio power amplifier system 100 is V amp_out The amplitude of the audio data of each time interval is the input amplitude V of each time interval of the audio data amp_in Product of the preset amplitude GAIN GAIN, i.e，V amp_out ＝V amp_in * GAIN. It will be appreciated that in order to ensure that the audio data output by the power amplifier is not subject to the power amplifier supply voltage V BST Is limited to generate truncated distortion, and power amplifier supply voltage V BST The audio data required to be greater than the output of the power amplifier has an amplitude V amp_out . Assuming that the required supply voltage required by the audio data output by the power amplifier is the amplitude V of the audio data amp_out Adding a residual voltage value VHR, i.e. V sup ＝V amp_out +V HR Power amplifier supply voltage V BST The required supply voltage V required to be greater than the audio data required by the output of the power amplifier sup The audio power amplifier system 100 determines an analog voltage control signal based on the required supply voltage and determines a corresponding control voltage based on the analog voltage control signal.
It can be appreciated that the voltage margin value V HR The application can be set according to the actual application scene, and the application can be used for measuring the voltage residual value V HR The specific numerical value of (2) is not limited.
In some embodiments, the voltage margin value V HR May be absolute voltage values such as 1V, 2V, etc. In other embodiments, the voltage margin value V HR Also can be a relative voltage, for example 10%. Times.V amp_out Etc., to which the present application is not limited.
Illustratively, taking the example that the analog voltage control signal is a 3-bit digital control signal, referring to table 1, table 1 shows a mapping relationship between the analog voltage control signal and the control voltage according to an embodiment of the present application.
Wherein DA is<2:0>Representing a 3-bit digital control signal, V C Denotes a control voltage, and VDD denotes a power supply voltage of the audio power amplifier system 100. It will be appreciated that the control voltage V C The expression of (2) may refer to formula (1).
V C ＝k·VDD (1)
Wherein V is C The VDD represents the control voltage, k represents the voltage division coefficient, and k is greater than 0 and less than 1, which represents the power supply voltage of the audio power amplifier system 100. It can be appreciated that if the analog voltage control signal is M bitsDigital control signal DA of (a)<M:0>Then k is 1/2 M Wherein M is an integer greater than 1.
It will be appreciated that the embodiment of the present application is illustrated by taking the example that the analog voltage control signal is a 3-bit digital control signal, and in other embodiments, the analog voltage control signal may be a 4-bit or other multi-bit digital control signal, and the present application does not specifically limit the value of the bit number M of the analog voltage control signal.
TABLE 1 analog voltage control Signal to control Voltage relationship Table
In some embodiments, the audio power amplification system 100 determines a control voltage corresponding to the input amplitude according to the input amplitude, and further includes: when the audio power amplification system 100 continuously detects N input amplitudes, determining a start time and an end time corresponding to each input amplitude, where N is an integer greater than 1; determining an ith input amplitude as a first amplitude, and determining an (i+1) th input amplitude as a second amplitude, wherein i is an integer greater than 0 and less than N; when the second amplitude is larger than or equal to the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be smaller than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier power supply voltage corresponding to the second amplitude is smaller than the starting time corresponding to the second amplitude; when the second amplitude is smaller than the first amplitude, the starting time of the analog voltage control signal corresponding to the second amplitude is controlled to be larger than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier power supply voltage corresponding to the second amplitude is larger than the starting time corresponding to the second amplitude.
It can be understood that when the input amplitude is detected to be large, an analog voltage control signal is output in advance, and the power amplifier supply voltage corresponding to the input amplitude is determined; when the input amplitude is detected to be smaller, the analog voltage control signal is output in a lagging way, and the power amplifier supply voltage corresponding to the input amplitude is determined. The effects of fast entering and slow exiting can be achieved, and the problem of distortion caused by untimely adjustment of the power supply voltage in the working process of the audio power amplifier can be prevented.
It will be appreciated that detecting a change in input amplitude may be detecting an amplitude over a time interval of a certain length, where the input amplitude is considered to be smaller if the input amplitude is continuously lower during the detection time.
S304: and determining the power amplifier supply voltage corresponding to the input amplitude based on the control voltage.
In some embodiments, the audio power amplifier system 100 adjusts the supply voltage of the power amplifier of the audio power amplifier system based on the control voltage and the feedback voltage to obtain the power amplifier supply voltage V BST . It can be appreciated that the supply voltage of the DC-DC converter is the battery voltage V BAT The output voltage of the DC-DC converter is the power amplifier supply voltage V BST 。
In some embodiments, the audio power amplifier system 100 adjusts the power supply voltage of the audio power amplifier system based on the control voltage and the feedback voltage to obtain the power amplifier power supply voltage V BST 。
Illustratively, reference is made to equation (2).
Wherein V is BST Representing the power supply voltage of the power amplifier, V FB Representing the feedback voltage of the DC-DC converter, V C The control voltages are represented by R1, R2, and R3, and the resistances of the resistors R1, R2, and R3 in the resistor network in the audio power amplifier system 100 are represented by the values.
Further deriving equation (2) may yield equation (3).
Wherein V is BST Representing the power supply voltage of the power amplifier, V FB Representing the feedback voltage of the DC-DC converter, V C The control voltages are represented by R1, R2 and R3, and the resistors R1, R2 and R3 in the resistor network in the audio power amplifier system 100Is a resistance value of (a).
It will be appreciated that the feedback voltage of the DC-DC converter is equal to its reference voltage, which is a fixed value. Therefore, the power supply voltage V of the power amplifier BST Can be controlled by a control voltage V C Control, i.e. by controlling the voltage V C Adjusting the power supply voltage of the audio power amplifier system 100 to obtain the power amplifier power supply voltage V BST . When controlling voltage V C When rising, the power amplifier supply voltage V BST Lowering; when controlling voltage V C When reducing, the power amplifier supply voltage V BST Raised.
It can be understood that the values of R1, R2 and R3 determine the power supply voltage V of the power amplifier according to the formula (1) and the formula (3) BST The bit number of the analog voltage control signal determines the power supply voltage V of the power amplifier BST Is used for adjusting the step length.
It will be appreciated that, in other embodiments, the steps shown in fig. 3 may be combined, deleted or replaced with other steps that are beneficial to achieving the object of the present application, for example, the step S301 and the step S302 may be combined into one step according to actual needs, which is not limited herein.
In some embodiments, the audio data of the power amplifier of the input audio power amplifier system 100 is an analog audio signal corresponding to the audio data of the input audio power amplifier system 100.
In some embodiments, the audio power amplifier system 100 performs delay processing on the received audio data through a programmable delay buffer to obtain delayed audio data. Wherein the delay time is greater than or equal to the response time of the DC-DC voltage converter in the audio power amplifier system 100.
It can be appreciated that after the audio data is delayed, the audio data output by the power amplifier in the audio power amplifier system 100 can be delayed to the analog voltage control signal, so that the audio power amplifier system 100 has adjusted the DC-DC converter to output the corresponding power supply voltage before the audio data is output by the power amplifier, and thus the audio data is prevented from being truncated.
In some embodiments, delay time T delay May be 10ms. In other embodiments, the delay time T delay Or may be 20ms, as the application is not limited in this regard.
Referring to fig. 5 for exemplary purposes, fig. 5 shows a schematic diagram of waveforms of audio data and delayed audio data, according to an embodiment of the present application. As shown in fig. 5, the audio data Vin is delayed by a delay time T delay After the delay processing of (a), the delayed audio data vin_delay is obtained.
In some embodiments, after audio processing is performed on the delayed audio data, the audio power amplifier system 100 performs digital-to-analog conversion on the processed audio data (digital audio signal) to obtain an analog audio signal.
Wherein audio processing of the delayed audio data includes, but is not limited to, sample rate conversion, audio algorithms, interpolation filtering, DSM conversion, etc., as the present application is not limited in this regard.
In some embodiments, the audio power amplifier system 100 powers the power amplifier based on the power amplifier supply voltage, amplifies the analog audio signal, and outputs the amplified analog audio signal.
Referring to fig. 6, fig. 6 shows a waveform diagram of audio data and audio data output by the audio power amplifier system 100 according to an embodiment of the present application.
When the input amplitude is detected to be large as shown in fig. 6, the power amplifier supply voltage corresponding to the input amplitude is output in advance; when detecting that the input amplitude becomes smaller, the power amplifier power supply voltage corresponding to the input amplitude is output in a lagging mode. It will be appreciated that by advancing and/or retarding the response, distortion problems caused by untimely supply voltage adjustments during operation of the audio power amplifier system 100 may be prevented.
For better understanding of the technical solution of the embodiments of the present application, the following describes the audio power amplifier system 100 provided by the present application in detail with reference to the accompanying drawings.
Fig. 7 shows a schematic structural diagram of an audio power amplifier system 100 according to an embodiment of the present application.
As shown in fig. 7, the audio power amplifier system 100 includes: an audio power amplifier chip 110, a resistor network 120, and a DC-DC converter chip 130. The audio power amplifier chip 110 includes an audio signal path 111, a voltage adaptive control path 112 (as a voltage control path), and a power amplifier 113.
It is understood that the audio power amplifier system 100 includes two chips, i.e., an audio power amplifier chip and a DC-DC converter chip, and may be suitable for more application scenarios.
An audio signal path 111 for acquiring audio data input to the audio power amplifier system; performing delay processing on the audio data to obtain delay audio data; and performing audio processing on the delayed audio data to obtain an analog audio signal.
The audio signal path 111 includes: a delay unit 1111, an audio signal processing unit 1112 (as a first processing unit), and a first digital-to-analog conversion module (DAC 1) 1113.
The delay unit 1111 is configured to perform delay processing on the audio data, to obtain delayed audio data. As shown in the schematic diagram of the delay unit in fig. 8, the delay unit 1111 has an input of the audio data Vin and an output of the delayed audio data vin_delay.
The audio signal processing unit 1112 is configured to perform audio processing on the delayed audio data.
The first digital-to-analog conversion module 1113 is configured to perform digital-to-analog conversion on the processed audio data (digital audio signal) to obtain an analog audio signal, and input the analog audio signal to the power amplifier.
A voltage adaptive control path 112, configured to obtain audio data input to the audio power amplifier system; determining an input amplitude of the audio data; according to the input amplitude of the audio data, a corresponding analog voltage control signal is determined and a control voltage is determined based on the analog voltage control signal.
The voltage adaptive control path 112 includes: a signal amplitude detector 1121, a digital processing unit 1122 (as a second processing unit), and a second digital-to-analog conversion module (DAC 2) 1123.
The signal amplitude detector 1121 is configured to obtain audio data input to the audio power amplifier system, and determine an input amplitude of the audio data. In some embodiments, signal amplitude detector 1121 receives audio data and determines a toneThe input amplitude of the frequency data. As shown in the schematic diagram of the signal amplitude detector in fig. 9, the input of the signal amplitude detector 1121 is audio data Vin, and the output is the input amplitude V corresponding to the time interval amp_in 。
The digital processing unit 1122 is used for determining a corresponding analog voltage control signal according to the input amplitude of the audio data. In some embodiments, digital processing unit 1122 receives an input amplitude of audio data and an amplitude GAIN GAIN, and generates a corresponding multi-bit digital control signal, i.e., an analog voltage control signal. As shown in the schematic diagram of the digital processing unit in fig. 10, the input of the digital processing unit 1122 is the input amplitude V of the audio data amp_in And amplitude GAIN GAIN, output as multi-bit digital control signal DA<M:0>Wherein M is an integer greater than 0.
The second digital-to-analog conversion module 1123 is configured to determine a control voltage based on the analog voltage control signal. In some embodiments, the second digital-to-analog conversion module 1123 receives the analog voltage control signal and converts the analog voltage control signal to output a corresponding control voltage V C And is sent out of the audio power amplifier chip 110 through the chip pins.
The power amplifier 113 is configured to amplify the analog audio signal based on the power supply voltage and output the amplified analog audio signal. In some embodiments, the power amplifier 113 may be a class AB or class D power amplifier, and receives the analog audio signal generated by the first digital-to-analog converter 1113, determines the amplified analog audio signal, and outputs the amplified analog audio signal to a speaker, and drives the speaker off-chip.
A resistor network 120 for determining the feedback voltage of the DC-DC converter chip 130 (as a voltage converter). In some embodiments, the resistor network 120 receives a control voltage V C And V output from the DC-DC converter chip 130 BST Voltage and correspondingly generate feedback voltage V FB 。
The DC-DC converter chip 130 is configured to adjust a power supply voltage of the audio power amplifier system based on the feedback voltage and the control voltage, to obtain a power amplifier power supply voltage.
In some embodiments, resistor network 120 and DC-DC converter chip 130 formAnd the power amplifier power supply voltage module is used for determining the power amplifier power supply voltage based on the control voltage. In some embodiments, reference is made to the schematic diagram of the second digital to analog converter shown in fig. 11. The second digital-to-analog conversion module 1123 includes: multi-bit digital-to-analog converter (RDAC) 1124, driver (Buffer) 1125, and filter capacitor C F 。
Taking the digital-to-analog converter as a 3-bit digital-to-analog converter as an example, referring to fig. 12, fig. 12 shows a schematic diagram of another second digital-to-analog converter according to an embodiment of the present application.
As shown in fig. 12, the second digital-to-analog conversion module 1123 includes: multi-bit digital-to-analog converter 1124, driver 1125, and filter capacitor C F . The multi-bit digital-to-analog converter 1124 includes: 8 voltage dividing resistors (R), 8 gating switches (S) and 1 3-8 decoders. The voltage dividing resistor divides the power supply voltage VDD of the audio power amplifier system 100 for 8 times; 3-bit digital control signal DA<2:0>Generating 8 control switches S through 3-8 decoders<7:0>Control gating switch to select corresponding voltage output V DAC The method comprises the steps of carrying out a first treatment on the surface of the Filter capacitor C F For pair V DAC Filtering to prevent V DAC Larger fluctuations are produced. V (V) DAC The voltage is passed through the driver 1125 to perform unit operational amplification to generate a control voltage V C I.e. V C ＝V DAC 。
The embodiment of the application also provides an electronic device comprising a processor and a memory, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions to execute the power supply voltage control method. The audio processing method may refer to the power supply voltage control method in the above embodiment, and the disclosure is not repeated here.
The embodiment of the application also provides a chip, which comprises a processor and a data interface, wherein the processor reads instructions stored in the memory through the data interface so as to execute the power supply voltage control method. The audio processing method may refer to the power supply voltage control method in the above embodiment, and the disclosure is not repeated here.
In the drawings, some structural or methodological features may be shown in a particular arrangement and/or order. However, it should be understood that such a particular arrangement and/or ordering may not be required. Rather, in some embodiments, these features may be arranged in a different manner and/or order than shown in the illustrative figures. Additionally, the inclusion of structural or methodological features in a particular figure is not meant to imply that such features are required in all embodiments, and in some embodiments, may not be included or may be combined with other features.
It should be noted that, in the embodiments of the present application, each unit/module mentioned in each device is a logic unit/module, and in physical terms, one logic unit/module may be one physical unit/module, or may be a part of one physical unit/module, or may be implemented by a combination of multiple physical units/modules, where the physical implementation manner of the logic unit/module itself is not the most important, and the combination of functions implemented by the logic unit/module is only a key for solving the technical problem posed by the present application. Furthermore, in order to highlight the innovative part of the present application, the above-described device embodiments of the present application do not introduce units/modules that are less closely related to solving the technical problems posed by the present application, which does not indicate that the above-described device embodiments do not have other units/modules.
It should be noted that in the examples and descriptions of this patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the application has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the application.

Claims (12)

1. The power supply voltage control method is applied to an audio power amplifier system and is characterized by comprising the following steps of:
acquiring audio data input into the audio power amplifier system;
determining an input amplitude of the audio data;
determining a control voltage corresponding to the input amplitude according to the input amplitude;
and determining the power amplifier supply voltage corresponding to the input amplitude based on the control voltage.
2. The method of claim 1, wherein determining the control voltage corresponding to the input amplitude based on the input amplitude comprises:
determining an amplitude gain and a voltage residual value of the audio data;
determining an output amplitude corresponding to the input amplitude according to the input amplitude and the amplitude gain;
determining a demand supply voltage based on the output amplitude and the voltage residual value;
determining an analog voltage control signal based on the required supply voltage;
the control voltage is determined based on the analog voltage control signal.
3. The method of claim 2, wherein the determining the control voltage based on the analog voltage control signal comprises:
determining the power supply voltage of the audio power amplifier system;
and determining the control voltage based on the analog voltage control signal and the power supply voltage of the audio power amplification system.
4. A method according to claim 3, wherein said determining a power amplifier supply voltage corresponding to said input amplitude based on said control voltage comprises:
determining feedback voltage of a voltage converter of the audio power amplification system, wherein the feedback voltage is equal to reference voltage of the voltage converter of the audio power amplification system;
and determining the power amplifier supply voltage based on the feedback voltage and the control voltage.
5. A method according to claim 3, wherein said determining a control voltage corresponding to said input amplitude from said input amplitude further comprises:
when the audio power amplification system continuously detects N input amplitudes, determining the starting time and the ending time corresponding to each input amplitude, wherein N is an integer greater than 1;
determining an ith input amplitude as a first amplitude, and determining an ith+1th input amplitude as a second amplitude, wherein i is an integer greater than 0 and less than N;
when the second amplitude is greater than or equal to the first amplitude, controlling the starting time of the analog voltage control signal corresponding to the second amplitude to be smaller than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier supply voltage corresponding to the second amplitude is smaller than the starting time corresponding to the second amplitude;
and when the second amplitude is smaller than the first amplitude, controlling the starting time of the analog voltage control signal corresponding to the second amplitude to be larger than the starting time corresponding to the second amplitude, so that the starting time of the power amplifier supply voltage corresponding to the second amplitude is larger than the starting time corresponding to the second amplitude.
6. The method of claim 2, wherein the step of determining the position of the substrate comprises,
the analog voltage control signal is a digital control signal of M bits, M being an integer greater than 1.
7. An audio power amplifier system, comprising:
the power supply voltage control path is used for acquiring audio data input into the audio power amplification system, determining the input amplitude of the audio data, and determining the control voltage corresponding to the input amplitude according to the input amplitude;
the power amplifier power supply voltage module is used for determining the power amplifier power supply voltage based on the control voltage;
and the power amplifier is used for amplifying the analog audio signal based on the power amplifier power supply voltage and determining the amplified analog audio signal.
8. The audio power amplifier system of claim 7, further comprising:
the delay unit is used for carrying out delay processing on the audio data to obtain delay audio data;
a first processing unit for performing audio processing on the delayed audio data;
the first digital-to-analog conversion module is used for carrying out digital-to-analog conversion on the audio data subjected to the audio processing to obtain an analog audio signal, and inputting the analog audio signal into the power amplifier.
9. The audio power amplifier system of claim 7, wherein the power amplifier supply voltage module comprises:
the resistor network is used for determining the feedback voltage of the voltage converter of the audio power amplifier system;
and the voltage converter is used for determining the power amplifier supply voltage based on the feedback voltage and the control voltage.
10. The audio power amplifier system of claim 7, wherein the voltage control path comprises:
a signal amplitude detector for determining an input amplitude of the audio data;
the second processing unit is used for determining the amplitude gain and the voltage residual value of the audio data, and determining the output amplitude corresponding to the input amplitude according to the input amplitude and the amplitude gain; determining a demand supply voltage based on the output amplitude and the voltage residual value; determining an analog voltage control signal based on the required supply voltage;
and the second digital-to-analog conversion module is used for determining the control voltage based on the analog voltage control signal.
11. An electronic device comprising a processor and a memory, the memory for storing program instructions, the processor for invoking the program instructions to perform the method of any of claims 1-6.
12. A chip comprising a processor and a data interface, the processor reading instructions stored on a memory via the data interface to perform the method of any one of claims 1 to 6.
CN202310720796.7A 2023-06-16 2023-06-16 Power supply voltage control method, audio power amplification system, electronic equipment and chip Pending CN116633276A (en)

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