CN112039447A - Audio power amplifier integrated circuit and audio equipment - Google Patents
Audio power amplifier integrated circuit and audio equipment Download PDFInfo
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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
- H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
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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
An audio power amplifier integrated circuit and an audio device, wherein, the audio power amplifier integrated circuit is used for amplifying the audio signal outputted by the audio source to drive the audio load, the audio power amplifier integrated circuit comprises a power circuit, an audio power amplifier circuit and a self-adapting circuit, the power circuit is used for outputting the supply voltage; the audio power amplifier circuit is connected with the power circuit and the audio load and is used for receiving the power supply voltage, working and amplifying the audio signal and then outputting a power amplifier signal to drive the audio load; the self-adaptive circuit is connected with the power circuit and the audio power amplifier circuit and is used for sampling the audio signals and increasing the power supply voltage when the amplitude of the audio signals is larger than a set threshold value, so that the technical problems of low integration level and poor power amplifier effect caused by the external power supply in the traditional audio power amplifier method are solved.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to an audio power amplifier integrated circuit and audio equipment.
Background
With the continuous progress of semiconductor technology, analog signals are often quantized and encoded into digital signals for storage and transmission. In the analog audio field, a sound signal is sampled and converted into a digital signal through an analog-to-digital converter, the sound signal is restored, the digital signal is converted into an analog signal through a digital-to-analog conversion circuit, and the sound signal can be obtained after filtering. Generally, the driving capability of the analog-to-digital converter is weak, and the multimedia device needs to be driven after the audio signal is power amplified. In order to output louder sound, the audio equipment needs to continuously increase the voltage at the power output end, and in the prior art, the voltage at the output end of the audio equipment is increased by adopting an external mode of a power supply, so that the integration level is lower, and the power amplification effect is poorer.
Therefore, the traditional audio power amplification method has the technical problems of low integration level and poor power amplification effect due to the external power supply.
Disclosure of Invention
The application aims to provide an audio power amplifier integrated circuit and audio equipment and aims to solve the technical problems that the integration level is low and the power amplifier effect is poor due to the fact that a power supply is external in the traditional audio power amplifier method.
A first aspect of the embodiments of the present application provides an audio power amplifier integrated circuit, configured to amplify an audio signal output by an audio source to drive an audio load, where the audio power amplifier integrated circuit includes:
a power supply circuit for outputting a supply voltage;
the audio power amplifier circuit is connected with the power supply circuit and the audio load and is used for receiving the power supply voltage, working and amplifying the audio signal and then outputting the power amplifier signal to drive the audio load; and
and the self-adaptive circuit is connected with the power supply circuit and the audio power amplifier circuit and is used for sampling the audio signal and increasing the power supply voltage when the amplitude of the audio signal is greater than a set threshold value.
In one embodiment, the method further comprises:
and the anti-sound-breaking control circuit is connected with the audio power amplifier circuit and is used for detecting the audio signal and adjusting the gain of the audio signal when the amplitude of the audio signal is greater than a preset amplitude so as to ensure that the amplitude of the audio signal is less than or equal to the preset amplitude.
In one embodiment, the method further comprises:
and the protection circuit is connected with the power circuit and the audio load and is used for cutting off the output of the power circuit when the audio load is subjected to overcurrent and/or overtemperature.
In one embodiment, the audio power amplifier circuit includes:
the pre-stage amplification circuit is used for receiving the audio signal, pre-amplifying the audio signal and outputting a secondary signal;
the gain amplification circuit is connected with the pre-stage amplification circuit and is used for performing gain amplification on the secondary signal and outputting a gain signal; and
and the power output circuit is connected with the gain amplifying circuit, the power supply circuit and the audio load and is used for receiving the gain signal and outputting the power amplifying signal.
In one embodiment, the power circuit includes a power chip, a first switch tube, a first adjustable resistor and a second adjustable resistor;
the power chip is connected with the grid electrode of the first switch tube, the drain electrode of the first switch tube is connected with the anode of the diode, the cathode of the diode is connected with the first end of the first capacitor and the first end of the first adjustable resistor, the cathode of the diode is also connected with the audio power amplification circuit, the second end of the first capacitor is grounded, the second end of the first adjustable resistor is connected with the first end of the second adjustable resistor, the common end of the first adjustable resistor and the second adjustable resistor is connected with the power chip, the second end of the second adjustable resistor is grounded, and the source electrode of the first switch tube is grounded.
In one embodiment, the anti-break control circuit includes:
the detection circuit is connected with the audio power amplification circuit and is used for detecting the amplitude of the audio signal;
and the regulating and controlling circuit is connected with the detecting circuit and the audio power amplifying circuit and is used for regulating the gain of the audio signal according to the amplitude of the audio signal.
In one embodiment, the detection circuit comprises a first comparator and a control chip;
the in-phase end of the first comparator is connected with the regulating and controlling circuit, the out-phase end of the first comparator is connected with the audio power amplifier circuit, the output end of the first comparator is connected with the control chip, and the control chip is connected with the regulating and controlling circuit.
In one embodiment, the regulation and control circuit includes a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a second capacitor, a third capacitor, a fourth capacitor, a second comparator, a third comparator, a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
the grid electrode of the second switch tube, the grid electrode of the third switch tube, the grid electrode of the fourth switch tube and the grid electrode of the fifth switch tube are all connected with the control chip, the source electrode of the second switch tube is connected with the in-phase end of the first comparator, the drain electrode of the second switch tube is connected with the drain electrode of the third switch tube and the source electrode of the fourth switch tube, the source electrode of the third switch tube is grounded, the drain electrode of the fourth switch tube is connected with the source electrode of the fifth switch tube and the first end of the second capacitor, the second end of the second capacitor is grounded, the drain electrode of the fifth switch tube is connected with the in-phase end of the second comparator and the in-phase end of the third comparator, the output end of the second comparator and the output end of the third comparator are both connected with the input end of the first amplifier, and the output end of the first amplifier is connected with the grid electrode of the sixth switch tube, the drain electrode of the sixth switch tube is connected with the second end of the first resistor and the first end of the second resistor, the first end of the first resistor is connected with the audio power amplifier circuit, the second end of the second resistor is connected with the first end of the third resistor and the first end of the fourth capacitor, the second end of the third resistor is connected with the audio power amplifier circuit, the source electrode of the sixth switch tube is connected with the second end of the fourth resistor and the first end of the fifth resistor, the first end of the fourth resistor is connected with the audio power amplifier circuit, the second end of the fifth resistor is connected with the second end of the fourth capacitor and the first end of the sixth resistor, and the second end of the sixth resistor is connected with the audio power amplifier circuit.
In one embodiment, the adaptive circuit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a second amplifier;
the grid electrode of the seventh switch tube and the grid electrode of the eighth switch tube are both connected with the audio power amplifier circuit, the source electrode of the seventh switch tube and the source electrode of the eighth switch tube are both connected with the drain electrode of the ninth switch tube, the drain electrode of the ninth switch tube is connected with the grid electrode of the ninth switch tube and the grid electrode of the tenth switch tube, the source electrode of the ninth switch tube is connected with the source electrode of the tenth switch tube, the drain electrode of the tenth switch tube is connected with the source electrode of the eleventh switch tube and the input end of the second amplifier, and the output end of the second amplifier is connected with the power circuit.
The present application provides in a second aspect an audio device comprising:
an audio load; and
the audio power amplifier integrated circuit is used for amplifying the audio signal output by the audio source to drive the audio load.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the audio power amplifier integrated circuit and the audio equipment, the audio power amplifier circuit is arranged to amplify the audio signal, the power supply circuit is arranged to provide power supply voltage for the audio power amplifier circuit, the adaptive circuit is arranged to sample the audio signal, and when the amplitude of the audio signal is larger than a set threshold value, the power supply voltage is increased, so that the effect of improving the driving capability of an audio load is achieved; according to the application, the power supply circuit and the audio power amplifier circuit are subjected to monolithic integration, the output of higher power can be realized only by supplying power by a single power supply in the application process, the amplitude of a signal can be detected, the dynamic adjustment of power amplifier driving voltage and sound breaking prevention control output gain are realized, the hearing sense is comfortable, and the application is wide in high-power output portable multimedia products.
Drawings
Fig. 1 is a schematic diagram of a structural module of an audio power amplifier integrated circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of an audio power amplifier integrated circuit according to another embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a circuit principle corresponding to the audio power amplifier circuit shown in FIG. 1;
FIG. 4 is a schematic block diagram of the anti-mute control circuit shown in FIG. 2;
FIG. 5 is a schematic circuit diagram of the detection circuit shown in FIG. 4;
FIG. 6 is a schematic circuit diagram of the regulation circuit shown in FIG. 4;
FIG. 7 is a timing diagram illustrating a control process of the anti-mute control circuit shown in FIG. 4;
FIG. 8 is a timing diagram of another control process corresponding to the anti-mute control circuit shown in FIG. 4;
fig. 9 is a schematic circuit diagram corresponding to the adaptive circuit shown in fig. 2.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a schematic diagram of a structural module of an audio power amplifier integrated circuit according to an embodiment of the present application is shown, for convenience of description, only the relevant portions of the embodiment are shown, and the detailed description is as follows:
in one embodiment, an audio power amplifier integrated circuit is used for amplifying an audio signal output by an audio source 107 to drive an audio load 101, and includes a power circuit 102, an audio power amplifier circuit 103, and an adaptive circuit 104.
The power supply circuit 102 is configured to output a supply voltage.
Specifically, the power supply circuit 102 adjusts the power supply voltage output by itself according to the sampling result fed back by the adaptive circuit 104, and increases or decreases the power supply voltage, so as to achieve dynamic balance of the audio power amplifier integrated circuit.
The audio power amplifier circuit 103 is connected to the power circuit 102 and the audio load 101, and is configured to receive the power supply voltage and then operate, and to amplify the audio signal and then output a power amplifier signal to drive the audio load 101.
Specifically, the input end of the audio power amplifier circuit 103 receives an audio signal in a fully differential input manner, so that a common-mode signal of the input end is effectively suppressed, and the sensitivity of noise injection relative to the ground can be reduced; the audio power amplifier circuit 103 amplifies the audio signal and outputs a power amplifier signal to drive the audio load 101; the audio power amplifier circuit 103 receives the power supply voltage, provides its own driving voltage, and adjusts the corresponding power amplifier capability according to the change of the power supply voltage, and the larger the voltage value of the power supply voltage is, the stronger the power amplifier capability of the audio power amplifier circuit 103 is.
The adaptive circuit 104 is connected to the power circuit 102 and the audio power amplifier circuit 103, and is configured to sample an audio signal and increase a power supply voltage when an amplitude of the audio signal is greater than a set threshold.
Specifically, the adaptive circuit 104 samples the audio signal, and when the amplitude of the audio signal is greater than a set threshold, triggers a voltage adaptive function to dynamically adjust the power circuit 102, thereby increasing the power supply voltage, and maximizing the power output of the power circuit 102 while ensuring the efficiency of the power circuit 102.
Referring to fig. 2, a schematic diagram of a structural module of an audio power amplifier integrated circuit according to another embodiment of the present application is shown, for convenience of description, only the relevant portions of the embodiment are shown, and the detailed description is as follows:
in one embodiment, the anti-break control circuit 105 is further included.
The anti-break control circuit 105 is connected to the audio power amplifier circuit 103, and is configured to detect the audio signal, and adjust a gain of the audio signal when the amplitude of the audio signal is greater than a preset amplitude, so as to ensure that the amplitude of the audio signal is less than or equal to the preset amplitude.
Specifically, the sound break prevention control circuit 105 detects the audio signal, and when the amplitude of the audio signal is detected to be smaller than or equal to the preset amplitude, the audio load 101 is not caused to break; when the amplitude of the audio signal is detected to be larger than the preset amplitude, the power amplifier signal output by the audio power amplifier circuit 103 is easy to generate the condition of topping distortion, so that the audio load 101 is enabled to break sound, in order to avoid the sound breaking phenomenon, the audio power amplifier circuit 103 outputs an adjusting gain signal, the gain of the audio signal is adjusted, the gain of the audio power amplifier circuit 103 is adjusted, in order to ensure that the amplitude of the audio signal is smaller than or equal to the preset amplitude, the integrity of the power amplifier signal is ensured, the audio load 101 is better driven, the tone quality of the audio load 101 is obviously improved, and the audio load 101 is protected from overload damage while the hearing sense is ensured.
In one embodiment, a protection circuit 106 is further included.
The protection circuit 106 is connected to the power circuit 102 and the audio load 101, and is configured to cut off the output of the power circuit 102 when the audio load 101 is over-current and/or over-temperature.
Specifically, the protection circuit 106 includes an overcurrent protection module and an overtemperature protection module, the overcurrent protection module samples the current of the audio load 101, and when the current of the audio load 101 is large, the power supply circuit 102 is turned off to realize overcurrent protection of the circuit; the over-temperature protection module performs over-temperature protection on the circuit, and under the condition of thermal overload, namely when the junction temperature exceeds 160 ℃, the chip in the power circuit 102 is enabled to be closed, the power circuit 102 is turned off, and the over-temperature protection on the circuit is realized.
Please refer to fig. 3, which is a schematic circuit diagram of the audio power amplifier circuit shown in fig. 1, for convenience of description, only the parts related to the present embodiment are shown, and the following details are described below:
in one embodiment, the audio power amplifier circuit 103 includes a pre-amplifier circuit 1031, a gain amplifier circuit 1032 and a power output circuit 1033.
The pre-amplifier circuit 1031 is configured to receive the audio signal, pre-amplify the audio signal, and output a secondary signal.
Specifically, the pre-stage amplification circuit 1031 performs preliminary amplification processing on the audio signal by using a differential amplification circuit, and outputs a secondary signal.
The gain amplifier circuit 1032 is connected to the pre-stage amplifier circuit 1031, and is configured to gain-amplify the secondary signal and output a gain signal.
Specifically, the gain amplifier circuit 1032 receives the secondary signal, performs gain amplification processing on the secondary signal, and outputs a gain signal to the power output circuit 1033 after obtaining an output signal with sufficient gain.
The power output circuit 1033 is connected to the gain amplifier circuit 1032, the power supply circuit 102, and the audio load 101, and is configured to receive the gain signal and output a power amplifier signal.
Specifically, the power output circuit 1033 receives the gain signal, the power supply circuit 102 provides a power supply voltage, and adjusts the magnitude of the power amplifier signal according to the power supply voltage to drive the audio load 101.
In one embodiment, a connector 1034 is further disposed between the gain amplifier circuit 1032 and the power output circuit 1033 for transmitting the gain signal.
In one embodiment, the power circuit 102 includes a power chip U1, a first switch Q1, a first adjustable resistor RP1, and a second adjustable resistor RP 2.
The power chip U1 is connected with the gate of the first switch tube Q1, the drain of the first switch tube Q1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the first end of the first capacitor C1 and the first end of the first adjustable resistor RP1, the cathode of the diode D1 is further connected with the audio power amplifier circuit 102, the second end of the first capacitor C1 is grounded, the second end of the first adjustable resistor RP1 is connected with the first end of the second adjustable resistor RP2, the common connection end of the first adjustable resistor RP1 and the second adjustable resistor RP2 is connected with the power chip U1, the second end of the second adjustable resistor RP2 is grounded, and the source of the first switch tube Q1 is grounded.
The power supply circuit 102 outputs a supply voltage by controlling the on or off state of the first switching tube Q1, where the output supply voltage adopts the following expression:
in the formula, VoutFor supply voltage, VfbFor feedback voltage, R1 is the resistance of the first adjustable resistor, and R2 is the resistance of the second adjustable resistor.
When the adaptive circuit 104 detects that the amplitude of the audio signal is greater than a set threshold, the power supply circuit 102 is triggered to switch to the boost mode, and the output of the power amplifier signal is ensured by adjusting the proportion of the R1 to the R2 to adjust the magnitude of the output power supply voltage.
Please refer to fig. 4, which is a schematic diagram of a structural module corresponding to the sound-break-preventing control circuit shown in fig. 2, and for convenience of description, only the parts related to the present embodiment are shown, and the details are as follows:
in one embodiment, the anti-mute control circuit 105 includes a detection circuit 1051 and a regulation circuit 1052.
The detection circuit 1051 is connected with the audio power amplifier circuit 103 and is used for detecting the amplitude of the audio signal.
Please refer to fig. 5, which is a schematic circuit diagram corresponding to the detection circuit shown in fig. 4, for convenience of description, only the parts related to the present embodiment are shown, and the following details are described below:
in one embodiment, the detection circuit 1051 includes a first comparator IC1 and a control chip U2.
Specifically, the in-phase terminal of the first comparator IC1 is connected to the voltage VDD, the out-phase terminal of the first comparator IC1 is connected to the output terminal of the connector 1034 in the audio power amplifier circuit 103, the output terminal of the first comparator IC1 is connected to the control chip U2, and the control chip U2 is connected to the regulation circuit 1052.
Please refer to fig. 6, which is a schematic circuit diagram of the regulation circuit shown in fig. 4, for convenience of description, only the parts related to the present embodiment are shown, and the details are as follows:
in one embodiment, the adjusting circuit 1052 is connected to the detecting circuit 1051 and the audio power amplifier circuit 103, and is configured to adjust the gain of the audio signal according to the amplitude of the audio signal.
Specifically, the regulating circuit 1052 includes a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a second comparator IC2, a third comparator IC3, a first amplifier AM1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
The grid of the second switch tube Q2, the grid of the third switch tube Q3, the grid of the fourth switch tube Q4 and the grid of the fifth switch tube Q5 are all connected with the control chip U2, the source of the second switch tube Q2 is connected with the non-inverting terminal of the first comparator IC1, the drain of the second switch tube Q2 is connected with the drain of the third switch tube Q3 and the source of the fourth switch tube Q4, the source of the third switch tube Q3 is grounded, the drain of the fourth switch tube Q4 is connected with the source of the fifth switch tube Q5 and the first terminal of the second capacitor C2, the second terminal of the second capacitor C2 is grounded, the drain of the fifth switch tube Q5 is connected with the non-inverting terminal of the second comparator IC2 and the non-inverting terminal of the third comparator IC3, the non-inverting terminals of the second comparator IC2 and the third comparator IC3 are respectively connected with the two symmetrical triangular wave amplifier VA and the output terminal VA of the second comparator IC2 and the third comparator IC 599, the output end of the first amplifier AM1 is connected to the gate of a sixth switch Q6, the drain of the sixth switch Q6 is connected to the second end of the first resistor R1 and the first end of the second resistor R2, the first end of the first resistor R1 is connected to the audio power amplifier circuit 103, the second end of the second resistor R2 is connected to the first end of the third resistor R3 and the first end of the fourth capacitor C4, the second end of the third resistor R3 is connected to the audio power amplifier circuit, the source of the sixth switch Q6 is connected to the second end of the fourth resistor R4 and the first end of the fifth resistor R5, the first end of the fourth resistor R4 is connected to the audio power amplifier circuit 103, the second end of the fifth resistor R5 is connected to the second end of the fourth capacitor C4 and the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is connected to the audio power amplifier circuit 103.
Please refer to fig. 7, which is a timing diagram corresponding to the control process of the sound-break-preventing control circuit shown in fig. 4, for convenience of description, only the parts related to the present embodiment are shown, and the following details are described below:
the detection circuit 1051 detects the gain signal of the audio power amplifier circuit 103, when the amplitude of the gain signal is smaller than or equal to a preset amplitude, the potential of the out-phase end of the first comparator IC1 is 1/2VDD, the control chip U2 controls the switching states of the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5, the second switch tube Q2 is turned off, the third switch tube Q3 is turned on, the fourth switch tube Q4 and the fifth switch tube Q5 generate non-overlapping clocks, so that the voltage VNCN of the same-phase end of the second comparator IC2 and the same-phase end of the third comparator IC3 is gradually reduced, and the on-time of the sixth switch tube Q6 is gradually reduced by comparing with the triangular waves VA and VB, and sound breaking of the audio load 101 is not caused.
Please refer to fig. 8, which is a timing diagram corresponding to another control process of the sound-break-preventing control circuit shown in fig. 4, for convenience of description, only the parts related to the present embodiment are shown, and the following details are described below:
the detection circuit 1051 detects the gain signal of the audio power amplifier circuit 103, when the amplitude of the gain signal is greater than a preset amplitude, the potential of the non-inverting terminal of the first comparator IC1 is between 0 potential and VDD potential, the control chip U2 controls the switching states of the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4 and the fifth switch tube Q5, the second switch tube Q2 is turned on and off, the third switch tube Q3 is turned off, the fourth switch tube Q4 and the fifth switch tube Q5 generate non-overlapping clocks, so that the voltage VNCN of the inverting terminal of the second comparator IC2 and the inverting terminal of the third comparator IC3 is gradually increased, and the on-time of the sixth switch tube Q6 is gradually increased by comparing with the triangular waves VA and VB, thereby entering a mute mode, achieving the purpose of dynamically adjusting the gain, and ensuring the integrity of the output signal.
Referring to fig. 9, a schematic diagram of a circuit of the adaptive circuit shown in fig. 2 is shown, for convenience of illustration, only the relevant parts of the embodiment are shown, and the following details are described:
in one embodiment, the adaptive circuit 104 includes a seventh switching tube Q7, an eighth switching tube Q8, a ninth switching tube Q9, a tenth switching tube Q10, an eleventh switching tube Q11, and a second amplifier AM 2.
Specifically, the gate of the seventh switching tube Q7 and the gate of the eighth switching tube Q8 are both connected to the audio power amplifier circuit 103, the source of the seventh switching tube Q7 and the source of the eighth switching tube Q8 are both connected to the drain of the ninth switching tube Q9, the drain of the ninth switching tube Q9 is connected to the gate of the ninth switching tube Q9 and the gate of the tenth switching tube Q10, the source of the ninth switching tube Q9 is connected to the source of the tenth switching tube Q10, the drain of the tenth switching tube Q10 is connected to the source of the eleventh switching tube Q11 and the input of the second amplifier AM2, and the output of the second amplifier AM2 is connected to the power supply circuit 102.
The second-level signal in the audio power amplifier circuit 103 is collected through the grid of the seventh switch tube Q7 and the grid of the eighth switch tube Q8, when the amplitude of the second-level signal is larger than a set threshold value, the power supply circuit 102 is triggered through the output end of the second amplifier AM2 to switch to a boosting mode, and the proportion of the R1 to the R2 is adjusted, so that the size of the output power supply voltage is adjusted, and the output of the power amplifier signal is ensured.
The present application provides in a second aspect an audio device comprising an audio load; and the audio power amplifier integrated circuit.
Wherein the audio load may be a multimedia device. The audio power amplifier integrated circuit is used for amplifying the audio signal output by the audio source so as to drive the audio load.
It should be noted that the audio device is added with the audio load 101 on the basis of the audio power amplifier integrated circuit, so that the functional description and the principle description of the power circuit 102, the audio power amplifier circuit 103 and the adaptive circuit 104 of the audio power amplifier integrated circuit may refer to the embodiments of fig. 1 to 9, and are not repeated herein.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the audio power amplifier integrated circuit and the audio equipment, the audio power amplifier circuit 103 is arranged to amplify an audio signal, the power supply circuit 102 is arranged to provide power supply voltage for the audio power amplifier circuit 103, the adaptive circuit 104 is arranged to sample the audio signal, and when the amplitude of the audio signal is larger than a set threshold value, the power supply voltage is increased, so that the effect of improving the driving capability of the audio load 101 is achieved; according to the application, the power circuit 102 and the audio power amplifier circuit 103 are integrated in a single chip, the output of larger power can be realized only by supplying power by a single power supply in the application process, the amplitude of a signal can be detected, the dynamic adjustment of power amplifier driving voltage and sound breaking prevention control output gain are realized, the hearing feeling is comfortable, and the application is widely applied to high-power output portable multimedia products.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An audio power amplifier integrated circuit for amplifying an audio signal output by an audio source to drive an audio load, the audio power amplifier integrated circuit comprising:
a power supply circuit for outputting a supply voltage;
the audio power amplifier circuit is connected with the power supply circuit and the audio load and is used for receiving the power supply voltage, working and amplifying the audio signal and then outputting the power amplifier signal to drive the audio load; and
and the self-adaptive circuit is connected with the power supply circuit and the audio power amplifier circuit and is used for sampling the audio signal and increasing the power supply voltage when the amplitude of the audio signal is greater than a set threshold value.
2. The audio power amplifier integrated circuit of claim 1, further comprising:
and the anti-sound-breaking control circuit is connected with the audio power amplifier circuit and is used for detecting the audio signal and adjusting the gain of the audio signal when the amplitude of the audio signal is greater than a preset amplitude so as to ensure that the amplitude of the audio signal is less than or equal to the preset amplitude.
3. The audio power amplifier integrated circuit of claim 1, further comprising:
and the protection circuit is connected with the power circuit and the audio load and is used for cutting off the output of the power circuit when the audio load is subjected to overcurrent and/or overtemperature.
4. The audio power amplifier integrated circuit of claim 1, wherein the audio power amplifier circuit comprises:
the pre-stage amplification circuit is used for receiving the audio signal, pre-amplifying the audio signal and outputting a secondary signal;
the gain amplification circuit is connected with the pre-stage amplification circuit and is used for performing gain amplification on the secondary signal and outputting a gain signal; and
and the power output circuit is connected with the gain amplifying circuit, the power supply circuit and the audio load and is used for receiving the gain signal and outputting the power amplifying signal.
5. The audio power amplifier integrated circuit of claim 1, wherein the power circuit comprises a power chip, a first switch tube, a first adjustable resistor and a second adjustable resistor;
the power chip is connected with the grid electrode of the first switch tube, the drain electrode of the first switch tube is connected with the anode of the diode, the cathode of the diode is connected with the first end of the first capacitor and the first end of the first adjustable resistor, the cathode of the diode is also connected with the audio power amplification circuit, the second end of the first capacitor is grounded, the second end of the first adjustable resistor is connected with the first end of the second adjustable resistor, the common end of the first adjustable resistor and the second adjustable resistor is connected with the power chip, the second end of the second adjustable resistor is grounded, and the source electrode of the first switch tube is grounded.
6. The audio power amplifier integrated circuit of claim 2, wherein the anti-mute control circuit comprises:
the detection circuit is connected with the audio power amplification circuit and is used for detecting the amplitude of the audio signal;
and the regulating and controlling circuit is connected with the detecting circuit and the audio power amplifying circuit and is used for regulating the gain of the audio signal according to the amplitude of the audio signal.
7. The audio power amplifier integrated circuit of claim 6, wherein the detection circuit comprises a first comparator and a control chip;
the in-phase end of the first comparator is connected with the regulating and controlling circuit, the out-phase end of the first comparator is connected with the audio power amplifier circuit, the output end of the first comparator is connected with the control chip, and the control chip is connected with the regulating and controlling circuit.
8. The audio power amplifier integrated circuit of claim 7, wherein the regulation circuit comprises a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a second capacitor, a third capacitor, a fourth capacitor, a second comparator, a third comparator, a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;
the grid electrode of the second switch tube, the grid electrode of the third switch tube, the grid electrode of the fourth switch tube and the grid electrode of the fifth switch tube are all connected with the control chip, the source electrode of the second switch tube is connected with the in-phase end of the first comparator, the drain electrode of the second switch tube is connected with the drain electrode of the third switch tube and the source electrode of the fourth switch tube, the source electrode of the third switch tube is grounded, the drain electrode of the fourth switch tube is connected with the source electrode of the fifth switch tube and the first end of the second capacitor, the second end of the second capacitor is grounded, the drain electrode of the fifth switch tube is connected with the in-phase end of the second comparator and the in-phase end of the third comparator, the output end of the second comparator and the output end of the third comparator are both connected with the input end of the first amplifier, and the output end of the first amplifier is connected with the grid electrode of the sixth switch tube, the drain electrode of the sixth switch tube is connected with the second end of the first resistor and the first end of the second resistor, the first end of the first resistor is connected with the audio power amplifier circuit, the second end of the second resistor is connected with the first end of the third resistor and the first end of the fourth capacitor, the second end of the third resistor is connected with the audio power amplifier circuit, the source electrode of the sixth switch tube is connected with the second end of the fourth resistor and the first end of the fifth resistor, the first end of the fourth resistor is connected with the audio power amplifier circuit, the second end of the fifth resistor is connected with the second end of the fourth capacitor and the first end of the sixth resistor, and the second end of the sixth resistor is connected with the audio power amplifier circuit.
9. The audio power amplifier integrated circuit according to claim 1, wherein the adaptive circuit comprises a seventh switching tube, an eighth switching tube, a ninth switching tube, a tenth switching tube, an eleventh switching tube and a second amplifier;
the grid electrode of the seventh switch tube and the grid electrode of the eighth switch tube are both connected with the audio power amplifier circuit, the source electrode of the seventh switch tube and the source electrode of the eighth switch tube are both connected with the drain electrode of the ninth switch tube, the drain electrode of the ninth switch tube is connected with the grid electrode of the ninth switch tube and the grid electrode of the tenth switch tube, the source electrode of the ninth switch tube is connected with the source electrode of the tenth switch tube, the drain electrode of the tenth switch tube is connected with the source electrode of the eleventh switch tube and the input end of the second amplifier, and the output end of the second amplifier is connected with the power circuit.
10. An audio device, comprising:
an audio load; and
the audio power amplifier integrated circuit of any one of claims 1-9 configured to amplify an audio signal output by an audio source to drive the audio load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064217.0A CN112039447A (en) | 2020-09-30 | 2020-09-30 | Audio power amplifier integrated circuit and audio equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064217.0A CN112039447A (en) | 2020-09-30 | 2020-09-30 | Audio power amplifier integrated circuit and audio equipment |
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| Publication Number | Publication Date |
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| CN112039447A true CN112039447A (en) | 2020-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011064217.0A Pending CN112039447A (en) | 2020-09-30 | 2020-09-30 | Audio power amplifier integrated circuit and audio equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115665632A (en) * | 2022-12-21 | 2023-01-31 | 荣耀终端有限公司 | Audio circuit, related device and control method |
| CN116723451A (en) * | 2023-08-10 | 2023-09-08 | 上海海栎创科技股份有限公司 | Playback power supply control circuit and control method |
-
2020
- 2020-09-30 CN CN202011064217.0A patent/CN112039447A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115665632A (en) * | 2022-12-21 | 2023-01-31 | 荣耀终端有限公司 | Audio circuit, related device and control method |
| CN115665632B (en) * | 2022-12-21 | 2023-06-06 | 荣耀终端有限公司 | Audio circuit, related device and control method |
| CN116723451A (en) * | 2023-08-10 | 2023-09-08 | 上海海栎创科技股份有限公司 | Playback power supply control circuit and control method |
| CN116723451B (en) * | 2023-08-10 | 2023-11-03 | 上海海栎创科技股份有限公司 | Playback power supply control circuit and control method |
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