CN111044780A - Digital audio power amplifier circuit and current sampling control circuit thereof - Google Patents
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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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
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
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- H—ELECTRICITY
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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Abstract
The application discloses digital audio power amplifier circuit and current sampling control circuit thereof, and the current sampling control circuit specifically comprises an input signal selection circuit, a synchronization and filter circuit, an edge detection circuit, a counter stepping control circuit, a pulse counter, a delay circuit and a sampling control unit. The current sampling control circuit finally outputs sampling control signals according to the input edge detection enabling signals, the feedback selection signals, the first feedback signals and the second feedback signals from the output stages of the two analog amplifiers of the digital audio power amplifier circuit, so that the corresponding sampling circuits are controlled to accurately sample the feedback current of the loudspeaker, and the digital audio power amplifier chip carries out over-temperature protection on the loudspeaker according to the feedback current.
Description
Technical Field
The present application relates to the field of audio processing technologies, and more particularly, to a digital audio power amplifier circuit and a current sampling control circuit thereof.
Background
In a digital audio system, in order to avoid burning out caused by over-temperature of a loudspeaker, a power amplifier chip with a loudspeaker protection algorithm can be used. In the model used by the loudspeaker protection algorithm built in the power amplifier chip, the feedback current of the loudspeaker is an important parameter of the loudspeaker, or is one of basic parameters for realizing loudspeaker protection by the model, so that the feedback current of the loudspeaker in a digital audio system needs to be accurately detected.
Disclosure of Invention
In view of this, the present application provides a digital audio power amplifier circuit and a current sampling circuit thereof, which are used for detecting a feedback current of a speaker.
In order to achieve the above object, the following solutions are proposed:
the utility model provides a current sampling control circuit, is applied to digital audio power amplifier circuit, current sampling circuit includes input signal selection circuit, synchronization and filter circuit, border detection circuit, counter step control circuit, pulse counter, delay circuit and sampling control unit, wherein:
the input signal selection circuit is used for receiving an edge detection enabling signal, a feedback selection signal, a first feedback signal and a second feedback signal from the output stages of the two analog amplifiers of the digital audio power amplification circuit and outputting a sampling feedback signal;
the synchronization and filtering circuit is used for receiving the sampling feedback signal and performing synchronization processing and filtering processing;
the edge detection circuit is used for receiving the sampling feedback signals subjected to synchronous processing and filtering processing, carrying out edge detection processing and outputting a plurality of mark signals at different moments in a period width;
the counter stepping control circuit is used for generating an addition indication signal according to the rising edge and the falling edge of the edge detection enable signal and the mark signal;
the pulse counter is used for counting the mark signals according to the edge detection enabling signals and the addition indicating signals and outputting sampling starting signals when the counting result reaches a preset value;
the delay circuit is used for finely adjusting a time node of the sampling start signal;
the sampling control unit is used for outputting a sampling control signal according to the fine-tuned sampling start signal, and the sampling control signal is used for controlling the sampling circuit to sample the feedback current of the loudspeaker driven by the digital audio power amplifier circuit.
Optionally, the sampling feedback signal is the first feedback signal or the second feedback signal selected by the edge detection enable signal and the feedback selection signal
Optionally, the addition indication signal includes a +1 indication signal and a +2 indication signal.
Optionally, the pulse counter outputs the sampling start signal when the pulse counter is full or exceeds a preset value.
Optionally, the preset value includes 255.
Optionally, the input signal of the pulse counter further includes a compensation signal.
Optionally, the apparatus further comprises a synchronous latch circuit, wherein:
the synchronous latch circuit is used for receiving an automatic single-side sampling signal and a periodic clock signal and outputting a mode switching signal to the input signal selection circuit, wherein the mode switching signal is used for controlling the sampling of the feedback current of any resistor of the loudspeaker.
A digital audio power amplifier circuit is applied to a digital audio system and comprises the current sampling control circuit.
According to the technical scheme, the digital audio power amplifier circuit and the current sampling control circuit thereof are disclosed, and the current sampling control circuit specifically comprises an input signal selection circuit, a synchronization and filtering circuit, an edge detection circuit, a counter stepping control circuit, a pulse counter, a delay circuit and a sampling control unit. The current sampling control circuit finally outputs sampling control signals according to the input edge detection enabling signals, the feedback selection signals, the first feedback signals and the second feedback signals from the output stages of the two analog amplifiers of the digital audio power amplifier circuit so as to control the corresponding sampling circuits to accurately sample the feedback current of the loudspeaker, and therefore the digital audio power amplifier chip carries out over-temperature protection on the loudspeaker according to the feedback current
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1a is a current trend diagram of a conventional equivalent model;
FIG. 1b is another current-carrying diagram of the prior art;
FIG. 1c is a schematic diagram of another conventional current profile;
FIG. 1d is a diagram of another conventional current profile;
FIG. 1e is a graph showing the relationship between current and voltage of a conventional horn;
FIG. 1f is a timing diagram of a conventional sampling signal;
fig. 2 is a circuit diagram of a current sampling control circuit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of another current sampling control circuit according to an embodiment of the present application;
FIG. 4 is a circuit diagram of another current sampling control circuit according to an embodiment of the present application;
FIG. 5a is a timing diagram illustrating synchronization, filtering and counting step control according to an embodiment of the present application;
FIG. 5b is a timing diagram of the sample start signal when the signal is not truncated and truncation occurs according to an embodiment of the present application;
FIG. 5c is a timing diagram of the sample start signal processed by the delay circuit;
FIG. 6 is a flow chart of a current sampling control method according to an embodiment of the present application;
fig. 7 is a flowchart of another current sampling control method according to an embodiment of the present application.
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 only a part of the embodiments of the present application, and not all of the embodiments. 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.
For a digital audio power amplifier circuit and a loudspeaker carried by the digital audio power amplifier circuit, an equivalent model is shown in fig. 1a to 1d, and the equivalent model is generally formed by connecting a 4 to 8 ohm resistor and an inductor of 20 to 40 muH in series. Fig. 1a to 1d correspond to current paths for different phases of PWM, respectively.
FIG. 1e is a graph of the current versus voltage of the horn, from which it can be seen that at the mid-point of the phase of the PWM, the instantaneous current I of the hornSPKThe average current I flowing through the horn is at least 4 times in a PWM cycleAVGThe same is true. In the design of the class-D amplifier in the bilateral modulation mode, each PWM period always has an interval, and current flows through the sampling resistor R simultaneouslySA/RSB. Therefore, the value of the current flowing through the horn can be accurately obtained by selecting the sampling of the Sigma-Delta ADC between the low levels of both PWMA and PWMB.
FIG. 1f is a timing diagram of a sampled signal, analyzed by the inventors, of a current sampled signalsample determines the performance of the entire Sigma-Delta ADC sample. If the level can be simultaneously low in the PWMA period and the PWMB period, the over-sampling resistor R is subjected to current samplingSAAnd RSBThe current is sampled, the accurate feedback current of the loudspeaker in a digital domain can be obtained after digital-to-analog conversion, and the feedback current is used as a current parameter to execute a loudspeaker protection algorithm, so that the loudspeaker can be well prevented from being burnt due to over-temperature.
To this end, a current sampling control circuit is provided in particular by the following embodiments to achieve accurate detection of the feedback current.
Example one
Fig. 2 is a schematic circuit structure diagram of a current sampling control circuit according to an embodiment of the present application.
As shown in fig. 2, the current sampling control circuit provided in this embodiment is applied to a digital audio power amplifier circuit, and specifically includes an input signal selection circuit 10, a synchronization and filtering circuit 20, an edge detection circuit 30, a counter step control circuit 40, a pulse counter 50, and a sampling control unit 60.
The input signal selection circuit is used for receiving an edge detection enable signal EN _ CLIP, a feedback selection signal iRcmp _ src, a first feedback signal PWM _ OUTA number and a second feedback signal PWM _ OUTB from output stages of two analog amplifiers of the digital audio power amplification circuit, and outputting a sampling feedback signal PWM _ cmp. The sampling feedback signal is a first feedback signal or a second feedback signal selected by the edge detection enable signal and the feedback selection signal.
The synchronization and filtering circuit 20 is configured to receive the sampling feedback signal, perform synchronization processing and filtering processing, and obtain a processed sampling feedback signal pwm _ in;
the edge detection circuit 30 is configured to receive the sampling feedback signal subjected to the synchronization processing and the filtering processing, perform edge detection processing, and output flag signals pwm _ in _ rtrig, pwm _ in _ ftrig, pwm _ in _ rpls, and pwm _ in _ fpls at a plurality of different times within one cycle width;
the counter stepping control circuit 40 is used for generating an addition indication signal plus2_ flag according to rising edges and falling edges of the edge detection enable signal and the flag signal; the signal includes a +1 control signal and a +2 control signal.
The pulse counter 50 is used for counting the addition indication signal, for example, when the +1 control signal is received, the +1 operation is performed on the original counting basis, and when the +2 control signal is received, the +2 operation is performed on the original counting basis, so as to count the number of the mark signals, and when the counting result meets a preset condition, or the counting result reaches a preset value, the sampling start signal sample _ start is output; the preset value may be selected to be 255 in the present application.
When receiving the sampling start signal SAMPLE _ start, the sampling control unit 60 outputs a sampling control signal SAMPLE to the sampling circuit, so that the sampling circuit SAMPLEs the feedback current of the speaker driven by the digital audio power amplifier circuit, and obtains a current feedback value by sampling.
It can be seen from the above technical solutions that the current sampling control circuit provided in this embodiment is applied to a digital audio power amplifier circuit, and specifically includes an input signal selection circuit, a synchronization and filtering circuit, an edge detection circuit, a counter step control circuit, a pulse counter, a delay circuit, and a sampling control unit. The current sampling control circuit finally outputs sampling control signals according to the input edge detection enabling signals, the feedback selection signals, the first feedback signals and the second feedback signals from the output stages of the two analog amplifiers of the digital audio power amplifier circuit, so that the corresponding sampling circuits are controlled to accurately sample the feedback current of the loudspeaker, and the digital audio power amplifier chip carries out over-temperature protection on the loudspeaker according to the feedback current.
Fig. 3 is a circuit diagram of another current sampling control circuit according to an embodiment of the present application.
As shown in fig. 3, the present embodiment further includes a delay circuit 70, where the delay circuit is configured to perform delay processing on the sampling start signal according to a preset delay parameter, so as to fine-tune the time node at which sampling starts, and implement more accurate sampling. We denote the fine-tuned (or post-fine tuned) sampling start signal as SAMPLE _ p and output it to the sampling control unit, so that the sampling control unit outputs the sampling control signal SAMPLE according to the fine tuned sampling start signal SAMPLE _ p.
According to the requirements of loudspeaker protection, the current sampling of the power amplifier signals in the process of truncation and non-truncation is supported through selection of the signals. By means of the synchronization and filtering circuit, the robustness of the sampling can be enhanced. Compared with analog design, the method can quickly complete verification and occupy less chip area.
The technical scheme of this application can be no matter the signal takes place the truncation or not and can both effectively sample, provides the current parameter that loudspeaker protection algorithm needs. The design of the digital architecture of the application can facilitate the modularization calling, can shorten the verification time and accelerate the iterative design of the chip adopting the technology, and can be widely applied to the digital audio power amplifier chip with current feedback and the chip needing similar related digital signal processing.
In addition, as shown in fig. 4, the current sampling control circuit further includes a synchronous latch circuit 80. The synchronous latch circuit is used for receiving an automatic single-side sampling signal RSA _ RAB _ AUTO and a periodic clock signal PWM _ CLK and outputting a mode switching signal ISN _ AUTO _ SEL to the input signal selection circuit, wherein the mode switching signal is used for controlling the sampling of the feedback current of any sampling resistor of the loudspeaker.
The specific signals in fig. 4 are described in table 1.
TABLE 1
Example two
The embodiment provides a digital audio power amplifier circuit, which can be specifically arranged on a chip and is provided with the current sampling control circuit provided by the previous embodiment. The current sampling control circuit specifically comprises an input signal selection circuit, a synchronization and filtering circuit, an edge detection circuit, a counter stepping control circuit, a pulse counter, a delay circuit and a sampling control unit. The current sampling control circuit finally outputs sampling control signals according to the input edge detection enabling signals, the feedback selection signals, the first feedback signals and the second feedback signals from the output stages of the two analog amplifiers of the digital audio power amplifier circuit, so that the corresponding sampling circuits are controlled to accurately sample the feedback current of the loudspeaker, and the digital audio power amplifier chip carries out over-temperature protection on the loudspeaker according to the feedback current.
EXAMPLE III
Fig. 6 is a flowchart of a current sampling control method according to an embodiment of the present application.
As shown in fig. 6, the current sampling control method provided in this embodiment is applied to a digital audio power amplifier circuit, and specifically includes the following steps:
and S1, receiving a plurality of signals in the digital audio power amplifier circuit and outputting a sampling feedback signal.
These signals include an edge detection enable signal EN _ CLIP, a feedback select signal iRcmp _ src, a first feedback signal PWM _ OUTA number and a second feedback signal PWM _ OUTB from output stages of two analog amplifiers of the digital audio power amplifier circuit in the digital audio power amplifier circuit. The sampling feedback signal pwm _ cmp is the first feedback signal or the second feedback signal selected by the edge detection enable signal and the feedback select signal.
And S2, carrying out synchronization processing and filtering processing on the sampling feedback signal.
And performing synchronous processing and filtering processing on the sampling feedback signal to obtain a processed sampling feedback signal pwm _ in.
And S3, performing edge detection processing on the sampling feedback signal.
After the sampling feedback signal is subjected to the synchronization processing and the filtering processing, the sampling feedback signal subjected to the processing is subjected to edge detection processing, and mark signals pwm _ in _ rtrig, pwm _ in _ ftrig, pwm _ in _ rpls and pwm _ in _ fpls at a plurality of different moments within one cycle width are obtained.
And S4, generating an addition indication signal according to the edge detection enable signal and the flag signal.
Specifically, an addition indication signal plus2_ flag is generated according to the rising edge and the falling edge of the edge detection enable signal and the flag signal; the addition indication signal includes a +1 control signal and a +2 control signal.
And S5, outputting a sampling start signal according to the addition instruction signal.
Counting the mark signal based on the accumulated calculation of the addition indicating signal, and outputting a sampling start signal sample _ start when the counting result meets a preset condition or reaches a preset value; the preset value may be selected to be 255 in the present application.
And S6, outputting a sampling control signal according to the sampling start signal.
That is, a sampling control signal SAMPLE is output based on the sampling start signal SAMPLE _ start, and the sampling control signal is used to control the sampling circuit to SAMPLE the feedback current of the loudspeaker driven by the digital audio power amplifier circuit, so as to obtain a current feedback value.
It can be seen from the above technical solutions that the current sampling control circuit provided in this embodiment is applied to a digital audio power amplifier circuit, and specifically includes an input signal selection circuit, a synchronization and filtering circuit, an edge detection circuit, a counter step control circuit, a pulse counter, a delay circuit, and a sampling control unit. The current sampling control circuit finally outputs sampling control signals according to the input edge detection enabling signals, the feedback selection signals, the first feedback signals and the second feedback signals from the output stages of the two analog amplifiers of the digital audio power amplifier circuit, so that the corresponding sampling circuits are controlled to accurately sample the feedback current of the loudspeaker, and the digital audio power amplifier chip carries out over-temperature protection on the loudspeaker according to the feedback current.
Fig. 7 is a flowchart of another current sampling control method according to an embodiment of the present application.
As shown in fig. 7, the following steps are further included after step S5 in this embodiment:
and S51, fine adjustment is carried out on the time node of the sampling start signal.
Specifically, the sampling start signal is delayed according to a preset delay parameter, so that the time node of the sampling start is finely adjusted, and more accurate sampling is realized. We denote the trimmed sample start signal as sample _ p.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. 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 terminal that comprises the element.
The technical solutions provided by the present application are introduced in detail, and specific examples are applied in the description to explain the principles and embodiments of the present application, and the descriptions of the above examples are only used to help understanding the method and the core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. The utility model provides a current sampling control circuit, is applied to digital audio power amplifier circuit, its characterized in that, current sampling circuit includes input signal selection circuit, synchronization and filter circuit, border detection circuit, counter step control circuit, pulse counter and sampling control unit, wherein:
the input signal selection circuit is used for receiving an edge detection enabling signal, a feedback selection signal, a first feedback signal and a second feedback signal from the output stages of the two analog amplifiers of the digital audio power amplification circuit and outputting a sampling feedback signal;
the synchronization and filtering circuit is used for receiving the sampling feedback signal and performing synchronization processing and filtering processing;
the edge detection circuit is used for receiving the sampling feedback signals subjected to synchronous processing and filtering processing, carrying out edge detection processing and outputting a plurality of mark signals at different moments in a period width;
the counter stepping control circuit is used for generating an addition indication signal according to the rising edge and the falling edge of the edge detection enable signal and the mark signal;
the pulse counter is used for counting the mark signals according to the edge detection enabling signals and the addition indicating signals and outputting sampling starting signals when the counting result reaches a preset value;
the sampling control unit is used for outputting a sampling control signal according to the sampling start signal, and the sampling control signal is used for controlling a sampling circuit to sample the feedback current of a loudspeaker driven by the digital audio power amplifier circuit.
2. The power sampling control circuit of claim 1, further comprising a delay circuit, wherein:
the delay circuit is used for finely adjusting the time node of the sampling start signal and outputting the finely adjusted sampling start signal to the sampling control unit;
and the sampling control unit is used for outputting a sampling control signal according to the fine-tuned sampling start signal.
3. The current sampling control circuit of claim 1, wherein the sampling feedback signal is the first feedback signal or the second feedback signal selected by the edge detect enable signal and the feedback select signal.
4. The current sampling control circuit of claim 1, wherein the addition indication signal comprises a +1 indication signal and a +2 indication signal.
5. The current sampling control circuit of claim 1, wherein the preset value comprises 255.
6. The current sampling control circuit of claim 1 wherein the input signal to the pulse counter further comprises a compensation signal.
7. The current sampling control circuit of any one of claims 1-6, further comprising a synchronous latch circuit, wherein:
the synchronous latch circuit is used for receiving an automatic single-side sampling signal and a periodic clock signal and outputting a mode switching signal to the input signal selection circuit, wherein the mode switching signal is used for controlling the sampling of the feedback current of any resistor of the loudspeaker.
8. A chip comprising a digital audio power amplifier circuit, wherein the digital audio power amplifier circuit comprises the current sampling control circuit according to any one of claims 1 to 7.
9. A current sampling control method is applied to a digital audio power amplifier circuit and is characterized by comprising the following steps:
receiving an edge detection enabling signal, a feedback selection signal, a first feedback signal and a second feedback signal from output stages of two analog amplifiers of the digital audio power amplification circuit, and selecting one of the first feedback signal and the second feedback signal as a sampling feedback signal to be output;
carrying out synchronous processing and filtering processing on the sampling feedback signal;
performing edge detection processing on the sampling feedback signals subjected to synchronous processing and filtering processing to obtain a plurality of mark signals at different moments in a period width;
generating an addition indication signal according to the rising edge and the falling edge of the edge detection enable signal and the mark signal;
counting the mark signals according to the edge detection enable signal and the addition indication signal, and outputting a sampling start signal when a counting result reaches a preset value;
and outputting a sampling control signal according to the sampling start signal, wherein the sampling control signal is used for controlling a sampling circuit to sample the feedback current of the loudspeaker driven by the digital audio power amplifier circuit.
10. The current sampling control method according to claim 9, further comprising, after outputting the sampling start signal, the steps of:
fine-tuning a time node of the sampling start signal;
and outputting a sampling control signal according to the fine-tuned sampling start signal.
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