CN115208325A - Class D power amplifier device and power supply method thereof - Google Patents
Class D power amplifier device and power supply method thereof Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 abstract description 5
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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
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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
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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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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- 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
- H03F3/217—Class D power amplifiers; Switching amplifiers
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- 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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/351—Pulse width modulation being used in an amplifying circuit
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Abstract
The application relates to the technical field of electronics, and discloses a D-type power amplifier device and a power supply method thereof, wherein the D-type power amplifier device comprises: the device comprises a control unit, a switching power supply unit and an amplifying unit; wherein, switching power supply unit includes: a first switching power supply and a second switching power supply; the control unit is connected with the switching power supply unit and the amplifying unit; the control unit is used for determining a switching power supply for supplying power to the amplifying unit in the switching power supply unit according to the sound source amplitude detected within the preset time; the switching power supply unit is connected with the amplifying unit; the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit, and the second switching power supply is used for outputting a voltage higher than the preset threshold value to the amplifying unit, so that the problems of low power amplification efficiency, serious IC heating and poor temperature rise performance of a D-type power amplifier under the condition of small output power are solved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a D-type power amplifier device and a power supply method thereof.
Background
At present, class-D power amplifiers are receiving attention from all aspects due to the trend of green revolution, and have advantages over other types of power amplifiers in small portable audio equipment such as automobile power amplifiers, notebook computer audio systems and professional ultra-high power amplifiers due to the characteristic of high efficiency.
However, a common power supply mode of a class D power amplifier is constant-voltage direct drive, and the high efficiency characteristic of the class D power amplifier cannot be fully exerted in a constant-voltage direct drive mode, so that the conventional class D power amplifier has the problems of low power amplifier efficiency, severe IC heating and poor temperature rise performance under the condition of low output power.
Disclosure of Invention
The invention aims to solve the problems and provides a D-type power amplifier device and a power supply method thereof, which solve the problems of low power amplifier efficiency, serious IC heating and poor temperature rise performance of the D-type power amplifier under the condition of low output power.
In order to solve the above problem, an embodiment of the present application provides a class D power amplifier device, including: the device comprises a control unit, a switching power supply unit and an amplifying unit; wherein, switching power supply unit includes: a first switching power supply and a second switching power supply; the control unit is connected with the switching power supply unit and the amplifying unit; the control unit is used for determining a switching power supply for supplying power to the amplifying unit in the switching power supply unit according to the sound source amplitude detected within the preset time; the switching power supply unit is connected with the amplifying unit; the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit, and the second switching power supply is used for outputting a voltage higher than the preset threshold value to the amplifying unit.
In order to solve the above problem, an embodiment of the present application further provides a power supply method for a class D power amplifier device, including: detecting the amplitude of a sound source within preset time; determining a switching power supply for supplying power to the amplification unit according to the amplitude of the sound source; the switching power supply is a first switching power supply or a second switching power supply, the first switching power supply is used for outputting voltage lower than a preset threshold value, and the second switching power supply is used for outputting voltage higher than the preset threshold value. And outputting the voltage to the amplifying unit by the determined switching power supply.
The power supply method of D class power amplifier device and D class power amplifier device that this application embodiment provided, sound source amplitude in detecting the preset time through the control unit, can obtain the required actual voltage of current amplification unit, because include in the switching power supply unit that the output is less than the first switching power supply of presetting threshold voltage and output is higher than the second switching power supply of presetting threshold voltage, thereby can confirm by which switching power supply in the switching power supply unit to the amplification unit output the voltage that accords with actual demand most, guaranteed that the power amplifier lasts the work in the high efficiency state, D class power amplifier is under the circumstances that output power is little, there is the power amplifier inefficiency, IC generates heat seriously and the temperature rise problem that the performance is poor.
In addition, the control unit is also used for outputting an enable signal and a PWM signal to the switching power supply unit; the PWM signal is used for controlling the voltage output by the switching power supply unit to the amplifying unit; the amplifying unit is used for receiving the analog signal sent by the control unit and amplifying the analog signal.
In addition, the switching power supply unit is implemented based on a BUCK circuit.
In addition, the control unit includes: and the DSP digital signal processor is used for presetting time based on the main frequency setting of the DSP.
In addition, a switching power supply for supplying power to an amplification unit according to the amplitude of a sound source is determined, comprising: calculating the output power of the amplifying unit according to the sound source amplitude; judging whether the output power is smaller than a preset threshold value or not; under the condition that the output power is smaller than a preset threshold value, determining that a power supply supplying power to the amplifying unit is a first switching power supply; and under the condition that the output power is greater than the preset threshold value, determining that the power supply supplying power to the amplifying unit is the second switching power supply.
Before the determined switching power supply outputs the voltage to the amplifying unit, the method further includes: and sending an enable signal to the switching power supply, and sending a PWM signal according to the output power, wherein the enable signal is used for driving the switching power supply to output voltage to the amplifying unit, and the PWM signal is used for controlling the voltage output by the switching power supply to the amplifier.
In addition, the preset threshold is set according to the efficiency curve of the class D power amplifier.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a class D power amplifier device according to an embodiment of the present application;
fig. 2 is an exemplary diagram of a class D power amplifier device according to an embodiment of the present application;
fig. 3 is a flowchart of a power supply method of a class D power amplifier device according to an embodiment of the present application;
fig. 4 is a flowchart of an implementation of a class D power amplification method according to an embodiment of the present application.
Detailed Description
It is known from the background art that there is a great need to provide a new class D power amplifier device to solve the problems of low power amplifier efficiency, severe IC heating and poor temperature rise performance of the class D power amplifier in the prior art under the condition of low output power. Moreover, the existing class D power amplifier has the following characteristics: under the condition of a certain supply voltage, the higher the output power of the power amplifier is, the higher the efficiency is; under the condition that the output power of the power amplifier is constant (taking the class-D power amplifier AW83118 as an example, when the output power of the power amplifier is less than 10W), the smaller the power supply voltage is, the higher the efficiency is.
In order to solve the above problem, based on the characteristics of the above class D power amplifier, an embodiment of the present application provides a class D power amplifier device, including: the device comprises a control unit, a switching power supply unit and an amplifying unit; wherein, switching power supply unit includes: a first switching power supply and a second switching power supply; the control unit is connected with the switching power supply unit and the amplifying unit; the control unit is used for determining a switching power supply for supplying power to the amplifying unit in the switching power supply unit according to the sound source amplitude detected within the preset time; the switching power supply unit is connected with the amplifying unit; the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit, and the second switching power supply is used for outputting a voltage higher than the preset threshold value to the amplifying unit.
The utility model provides a D class power amplifier device, detect the sound source amplitude in the preset time through the control unit, can obtain the required actual voltage of current amplification unit, because include the first switching power supply that the output is less than preset threshold voltage and export the second switching power supply that is higher than preset threshold voltage among the switching power supply unit, thereby can confirm by which switching power supply among the switching power supply unit to the amplification unit output the voltage that accords with actual demand most, guaranteed that the power amplifier lasts work at the high efficiency state, D class power amplifier is under the little condition of output power, there is the power amplifier inefficiency, IC generates heat seriously and the poor problem of temperature rise performance.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following describes each embodiment of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in various embodiments of the present application in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
An embodiment of the present application relates to a class D power amplifier device, and the class D power amplifier device includes: control unit, switching power supply unit and amplifying unit, wherein, switching power supply unit includes: a first switching power supply and a second switching power supply; the control unit is connected with the switching power supply unit and the amplifying unit, the class-D power amplifier device is shown in figure 1, the control unit is connected with the switching power supply unit and the amplifying unit, and the control unit is used for determining the switching power supply which supplies power to the amplifying unit in the switching power supply unit according to the sound source amplitude detected within the preset time; the switching power supply unit is connected with the amplifying unit; the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit, and the second switching power supply is used for outputting a voltage higher than the preset threshold value to the amplifying unit.
The control unit comprises an SOC Chip (System on Chip) and a DSP Chip (Digital Signal Process), and is used for detecting the amplitude of a sound source within preset time and determining that the first switching power supply supplies power to the amplifying unit according to the amplitude, or the second switching power supply supplies power to the amplifying unit, wherein the preset time is set according to the dominant frequency of the DSP; the control unit is further used for sending an enable signal and a PWM signal to the switching power supply unit after the switching power supply for outputting the voltage to the amplifying unit is determined, and sending the enable signal EN1 and the PWM signal to the first switching power supply under the condition that the switching power supply for outputting the voltage is the first switching power supply; when the switching power supply that outputs the voltage is the second switching power supply, the enable signal EN2 and the PWM signal are transmitted to the second switching power supply. The enabling signal is used for driving the switching power supply unit to output voltage to the amplifying unit; the PWM signal is used to control the voltage output from the switching power supply unit to the amplifying unit. The switching power supply unit is driven by the enable signal and the PWM signal to output a stable voltage to the amplifying unit.
The switching power supply unit comprises a DCDC-1 and a DCDC-2, namely a first switching power supply and a second switching power supply, wherein the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit after receiving the enable signal EN1 and the PWM signal, namely outputting a low voltage; the second switching power supply is used for outputting a voltage higher than a preset threshold value to the amplifying unit, namely outputting a high voltage after receiving the enable signal EN2 and the PWM signal. In addition, the switching power supply unit is implemented based on a BUCK circuit. The control unit selects different switching power supplies to supply power for the amplifying unit according to the amplitude condition, the efficiency of the D-type power amplifier is improved, the two switching power supplies work alternately, heat distribution is dispersed, and temperature rise performance is improved.
The amplifying unit is a D-type amplifier and is used for receiving an analog signal sent by the control voltage, amplifying the analog information based on the voltage transmitted by the switching power supply unit and driving the loudspeaker.
In an example, in order to make the class D power amplifier device clearer, the device is specifically described with reference to fig. 2:
the DSP is used for detecting the amplitude of the sound source and determining a switching power supply DCDC-1 or DCDC-2 for supplying power to a Class-D power amplifier according to the amplitude of the sound source; the SOC is used for sending an enable signal EN and a PWM signal for driving the switching power supply to output stable voltage to the Class-DAmplifier to the DCDC-1 or the DCDC-2 after the switching power supply for supplying power is determined; the SOC is also used for transmitting sound source analog signals OUTL and OUTR to the Class-dam as analog signals of a left channel and a right channel respectively; DCDC-1 and DCDC-2 are used for supplying power to OUT1 (low voltage) or OUT2 (high voltage) of the Class-DAmplifier after receiving the enable signal and the PWM signal transmitted by the SOC.
The embodiment of the application also provides a power supply method of the class-D power amplifier, which is applied to the class-D power amplifier device, and the method comprises the following steps: detecting the amplitude of a sound source within preset time; determining a switching power supply for supplying power to the amplification unit according to the amplitude of the sound source; the switching power supply is a first switching power supply or a second switching power supply, the first switching power supply is used for outputting voltage lower than a preset threshold value, and the second switching power supply is used for outputting voltage higher than the preset threshold value. And outputting the voltage to the amplifying unit by the determined switching power supply.
The implementation details of the power supply method for the class D power amplifier device in this embodiment are specifically described below, and the following contents are only for facilitating understanding of the implementation details of this solution, and are not necessary to implement this solution. The specific process is shown in fig. 3, and may include the following steps:
in step 301, the source amplitude within a preset time is detected. When the sound source amplitude is low, the power consumption required by the amplifying unit is low, and when the sound source amplitude is high, the power consumption required by the amplifying unit is high.
In one example, an SDP chip in the control unit detects an average amplitude of the sound source within a preset time, where the preset time is set according to a dominant frequency of the DSP, and the higher the dominant frequency of the DSP is, the shorter the preset time is.
In step 302, determining a switching power supply for supplying power to the amplifying unit according to the sound source amplitude; the switching power supply is a first switching power supply or a second switching power supply, the first switching power supply is used for outputting voltage lower than a preset threshold value, and the second switching power supply is used for outputting voltage higher than the preset threshold value.
In the embodiment of the present application, the specific implementation step of determining the switching power supply for supplying power to the amplifying unit according to the sound source amplitude includes: calculating the output power of the amplifying unit according to the sound source amplitude; judging whether the output power is smaller than a preset threshold value or not; determining a power supply supplying power to the amplifying unit as a first switching power supply under the condition that the output power is smaller than a preset threshold value; and under the condition that the output power is greater than the preset threshold value, determining that a power supply supplying power to the amplifying unit is a second switching power supply. The preset threshold is set according to the efficiency curve of the specific class-D power amplifier.
In step 303, a voltage is output to the amplifying unit by the determined switching power supply.
In one example, taking class D power amplifier AW83118 as an example, when the working power of the power amplifier is calculated in the interval of 10-35W according to the amplitude value of the sound source, the amplifying unit needs high voltage to supply power, so the second switching power supply is selected to output voltage to the amplifying unit; when the working power of the full-frequency sound and the bass sound is in the interval of 0-10W, the power supply voltage is smaller and the efficiency of the class-D power amplifier is higher because the power is constant (smaller than 10W), so that the power amplifier can be ensured to work in a high-efficiency interval only by selecting lower voltage for power supply at the moment, and the first switching power supply is selected to output voltage to the amplifying unit.
It should be noted that, the foregoing power interval is only used for explaining the foregoing content more clearly, and does not limit the power interval in this embodiment at all, and the specific power interval is determined according to the actual situation of the power amplifier.
In the embodiment of the application, before the voltage is output to the amplifying unit by the determined switching power supply, an enable signal is sent to the switching power supply, and a PWM signal is sent according to the output power, wherein the enable signal is used for driving the switching power supply to output the voltage to the amplifying unit, and the PWM signal is used for controlling the voltage output to the amplifying unit by the switching power supply.
In one example, in a case where it is determined that the voltage is output to the amplifying unit by the first switching power supply, the control unit transmits the enable signal EN1 and the PWM signal to the switching power supply; in the case that it is determined that the voltage is output to the amplifying unit by the second switching power supply, the control unit transmits an enable signal EN2 and a PWM signal to the switching power supply; through transmission enable signal and PWM signal, the switch unit can be according to the actual demand output suitable voltage of power amplifier, has guaranteed that the power amplifier is in the high efficiency state always.
In order to make the power supply method of the class D power amplifier device provided in the embodiment of the present application clearer, a detailed description is provided below with reference to fig. 4, and the detailed contents are as follows:
in step 401, the amplitude of the average sound source within a specific time is detected, and the output power of the amplifying unit is calculated.
In step 402, it is determined whether the output power is less than a predetermined threshold.
In step 403, when the output power is greater than the preset threshold, an enable signal EN2 is sent to the second switching power supply, and a PWM signal is sent according to the output power, so that the second switching power supply outputs a high voltage to the amplifying unit.
In step 404, in the case that the output power is smaller than the preset threshold, an enable signal EN2 is sent to the first switching power supply, and a PWM signal is sent according to the output power, so that the first switching power supply outputs a low voltage to the amplifying unit.
In step 405, the sound source analog signal is output to the amplification unit and amplified by the amplification unit.
The power supply method of the D-type power amplifier device provided by the embodiment of the application has the advantages that the amplitude of the sound source is automatically detected, the voltage is dynamically adjusted through the switching power supply unit based on the BUCK circuit according to the change of the amplitude of the sound source, the D-type power amplifier continuously works in a high-efficiency interval, the problem that the power amplifier is low in efficiency under the condition that the power amplifier is in a low power mode is solved, two switching power supplies are provided for alternately supplying power, the distribution of heat is dispersed, the heating of a chip is reduced, the temperature rise performance is improved, and the customer satisfaction is improved.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
The above-described embodiments are provided to enable persons skilled in the art to make and use the invention, and modifications and variations can be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present application, and therefore the scope of protection of the present application is not limited by the above-described embodiments but should be accorded the full scope of the inventive features set forth in the claims.
Claims (8)
1. A kind of D power amplifier device, characterized by that, comprising: the device comprises a control unit, a switching power supply unit and an amplifying unit; wherein the switching power supply unit includes: a first switching power supply and a second switching power supply;
the control unit is connected with the switching power supply unit and the amplifying unit; the control unit is used for determining a switching power supply which supplies power to the amplifying unit in the switching power supply unit according to the sound source amplitude detected within the preset time;
the switching power supply unit is connected with the amplifying unit; the first switching power supply is used for outputting a voltage lower than a preset threshold value to the amplifying unit, and the second switching power supply is used for outputting a voltage higher than the preset threshold value to the amplifying unit.
2. The class-D power amplifier device according to claim 1, wherein the control unit is further configured to output an enable signal and a PWM signal to the switching power supply unit; the enable signal is used for driving the switching power supply unit to output voltage to the amplifying unit, and the PWM signal is used for controlling the voltage output by the switching power supply unit to the amplifying unit;
the amplifying unit is used for receiving the analog signal sent by the control unit and amplifying the analog signal.
3. The class-D power amplifier device according to claim 1, wherein the switching power supply unit is implemented based on a BUCK circuit.
4. The class-D power amplifier device according to any of claims 1-3, wherein the control unit comprises: and the preset time is set based on the main frequency of the DSP.
5. A power supply method of a class D power amplifier device is characterized by comprising the following steps:
detecting the amplitude of a sound source within preset time;
determining a switching power supply for supplying power to the amplification unit according to the sound source amplitude; the switching power supply is a first switching power supply or a second switching power supply, the first switching power supply is used for outputting a voltage lower than a preset threshold value, and the second switching power supply is used for outputting a voltage higher than the preset threshold value;
and outputting the voltage to the amplifying unit by the determined switching power supply.
6. The power supply method of the class-D power amplifier device according to claim 5, wherein the determining the switching power supply to supply power to the amplifying unit according to the audio source amplitude comprises:
calculating the output power of the amplifying unit according to the sound source amplitude;
judging whether the output power is smaller than a preset threshold value or not;
determining that a power supply supplying power to the amplifying unit is the first switching power supply when the output power is smaller than a preset threshold value;
and determining that the power supply supplying power to the amplifying unit is the second switching power supply under the condition that the output power is greater than a preset threshold value.
7. The method for supplying power to a class-D power amplifier according to claim 6, wherein before the step of outputting the voltage from the determined switching power supply to the amplifying unit, the method further comprises: and sending an enable signal to the switching power supply, and sending a PWM signal according to the output power, wherein the enable signal is used for driving the switching power supply to output voltage to the amplifying unit, and the PWM signal is used for controlling the voltage output by the switching power supply to the amplifying unit.
8. The method according to claim 5, wherein the predetermined threshold is set according to an efficiency curve of the class D power amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210743616.2A CN115208325A (en) | 2022-06-27 | 2022-06-27 | Class D power amplifier device and power supply method thereof |
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| CN202210743616.2A CN115208325A (en) | 2022-06-27 | 2022-06-27 | Class D power amplifier device and power supply method thereof |
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| CN202210743616.2A Pending CN115208325A (en) | 2022-06-27 | 2022-06-27 | Class D power amplifier device and power supply method thereof |
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