Method and system for reducing sound energy consumption based on dynamic adjustment of power supply voltage

Abstract

The invention mainly relates to the technical field of audio processing, provides a method and a system for reducing the energy consumption of a sound box based on dynamic regulation of power supply voltage, and aims to regulate the voltage of a power supply and reduce the energy consumption of the sound box according to the volume of the sound box. Calculating a power amplifier theoretical power supply voltage corresponding to each level of volume according to the power amplifier output power; establishing a corresponding relation between the volume gear and the theoretical power supply voltage of the power amplifier based on a calculation result; after a user sets the volume gear, the actual power supply voltage of the power amplifier is adjusted to the corresponding theoretical power supply voltage according to the corresponding relation between the volume gear and the theoretical power supply voltage of the power amplifier, energy waste caused by fixed voltage power supply is avoided, unnecessary power loss is reduced, and the battery life of equipment is effectively prolonged.

Description

Technical Field

[0001] The present invention mainly relates to the field of audio processing technology, and in particular to a method and system for reducing audio energy consumption based on dynamically adjusting power supply voltage. Background Art

[0002] With the development of IoT technology and artificial intelligence, portable smart speakers have become one of the most popular consumer electronics products on the market. As consumers' demands for sound quality and energy-saving awareness continue to rise, audio quality and battery life have become key concerns. Traditional fixed-step-up power supply methods generally have limitations that restrict sound quality at high power output, such as clipping and peaking, which affect the listening experience. Regarding battery life and energy conservation, although battery technology continues to improve, with breakthroughs in battery capacity and charging time, energy conservation is an enduring concern, and battery capacity is always limited. Therefore, reducing the energy consumption of audio products and improving battery life are crucial.

[0003] Currently, most portable audio products on the market are powered by a Type-C power supply (PSU) and a built-in lithium battery. Type-C supplies 5V, while lithium batteries typically supply 3.7V. To achieve higher sound quality, a boost DC-DC converter is often used to boost the 5V / 3.7V voltage to power the amplifier, for example, to 9V or 12V. When boosting voltage, the higher the output voltage, the lower the efficiency. Therefore, the common fixed output voltage (such as 9V or 12V) approach has a drawback: the amplifier's supply voltage is fixed. When the user demands higher volume, the supply voltage limits the amplifier's output power or prevents it from maintaining low distortion, affecting sound quality. Furthermore, when the user turns down the volume, the supply voltage remains fixed, resulting in lower power conversion efficiency and a certain degree of energy waste. For example, if the user only needs 4W of output power, a 6V PA supply will meet the required sound quality, but the supply voltage remains at 9V or 12V. This low power conversion efficiency results in energy waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and system for reducing the energy consumption of an audio system based on dynamically adjusting the power supply voltage, the purpose of which is to adjust the voltage of the power supply according to the volume of the audio system to reduce the energy consumption of the audio system.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: In one aspect, the present invention provides a method for reducing audio energy consumption by dynamically adjusting a power supply voltage, the method comprising: Measure the power amplifier output power corresponding to each volume level, and calculate the theoretical power supply voltage corresponding to each volume level based on the power amplifier output power; Based on the calculation results, the corresponding relationship between the volume level and the theoretical power supply voltage of the power amplifier is established; After the user sets the volume level, the actual power supply voltage of the power amplifier is adjusted to the corresponding theoretical power supply voltage according to the corresponding relationship between the volume level and the theoretical power supply voltage of the power amplifier.

[0006] Furthermore, the calculation method of the power amplifier theoretical supply voltage is: , The theoretical power supply voltage for the power amplifier, is the output power of the amplifier corresponding to the corresponding volume level. is the power amplifier efficiency factor, is the speaker impedance.

[0007] Furthermore, the output voltage of the Boost DC-DC is adjusted by controlling PWM to supply power to the power amplifier.

[0008] Furthermore, the correspondence between the amplifier output power, the theoretical power supply voltage, and the PWM corresponding to the theoretical power supply voltage corresponding to each volume level is stored in the memory of the audio system. After the user sets the volume level, the processor adjusts the actual power supply voltage of the amplifier to the theoretical power supply voltage under the corresponding volume level by adjusting the PWM of the amplifier input voltage according to the correspondence.

[0009] Furthermore, the audio volume level can be adjusted by setting buttons.

[0010] Furthermore, the audio volume level can be adjusted through the far-field voice function.

[0011] On the other hand, the present invention also provides a system for reducing audio energy consumption based on dynamically adjusting the power supply voltage, the system comprising: a processor, an AC-DC power supply module, a charging management chip, a Boost DC-DC circuit, a power amplifier, and a speaker; The AC-DC power supply module is connected to the input end of the Boost DC-DC circuit through a charging management chip, and the output end of the Boost DC-DC circuit is connected to the power amplifier to supply power to the power amplifier. The processor is connected to the power amplifier and the speaker respectively. The theoretical power supply voltage corresponding to each volume level is stored in the memory. The processor is used to adjust the actual output voltage of the Boost DC-DC to the theoretical power supply voltage according to the theoretical power supply voltage corresponding to each volume level stored in the memory, and drive the speaker to produce sound.

[0012] Furthermore, the processor adjusts the actual power supply voltage of the power amplifier to the theoretical power supply voltage at the corresponding volume level by adjusting the PWM of the power amplifier input voltage.

[0013] Furthermore, the system also includes a far-field voice module, which is connected to the processor through PDM and is used to adjust the volume level of the audio through far-field voice.

[0014] Furthermore, the system also includes a volume adjustment key, which is used to adjust the volume level of the audio through key input.

[0015] Beneficial effects of the invention: The method for reducing audio energy consumption based on dynamic adjustment of the power supply voltage described in the present invention dynamically matches the power supply voltage according to the actual volume demand, avoids the energy waste caused by fixed voltage power supply, reduces unnecessary power loss, and effectively extends the battery life of the device. At the same time, through precise voltage regulation, it ensures that sufficient dynamic amplitude can be provided at different volumes, maintains high-quality audio output, avoids the maximum limitation of output power under fixed voltage output conditions, solves phenomena such as clipping and clipping, and improves the user's listening experience. The system for reducing audio energy consumption based on dynamic adjustment of the power supply voltage described in the present invention, based on the existing audio circuit, realizes the purpose of dynamically adjusting the power supply voltage and thus reducing energy consumption by collecting and processing the matching relationship data between the output power and the power supply voltage through software. It has low computational complexity, simple implementation, almost no delay, and does not increase hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of the method for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to the present invention; Figure 2 A flow chart of a method for dynamic voltage regulation; Figure 3 This is a curve diagram of the output power of the power amplifier and the actual supply voltage; Figure 4 This is a structural block diagram of the system for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to the present invention.

[0017] Figure 5 This is a schematic diagram of the Boost DC-DC circuit structure. DETAILED DESCRIPTION

[0018] The system for reducing audio energy consumption based on dynamic adjustment of power supply voltage of the present invention is as follows Figure 4 As shown, the system includes a lithium battery, a processor (CPU), an AC-DC power module, a charging management chip, a Boost DC-DC circuit, a power amplifier (PA) and a speaker; The AC-DC power supply module supplies power to the audio system through the output port of the charging management chip. The input end of the Boost DC-DC circuit is connected to the charging management chip, and the output end of the Boost DC-DC circuit is connected to the PVDD pin of the power amplifier to supply power to the power amplifier. The power amplifier is connected to the processor and the speaker. The processor stores the theoretical supply voltage corresponding to each volume level and is used to adjust the output voltage intensity of the power supply circuit to the theoretical supply voltage under the corresponding volume level.

[0019] The AC-DC power module is a 5V PSU that connects to the audio product via a Type-C port. The charging management chip features a power path function. The output pins of the charging management chip simultaneously power the audio product system and charge the internal lithium battery through the charging IC. When no external AC-DC power module is connected, the lithium battery powers the audio product system through the charging management chip output port.

[0020] The input of the boost DC-DC circuit is connected to the output pin of the charge management chip, while the output of the boost DC-DC circuit is connected to the PVDD pin of the power amplifier to power the amplifier. The processor controls the entire system, including audio decoding, volume adjustment, PWM signal output control, and the output voltage of the boost DC-DC circuit. The power amplifier and processor are connected via the I2S interface for audio data transmission. The power amplifier is connected to the speaker unit to drive the speaker to produce sound.

[0021] The system also includes a far-field voice module (MIC), a volume control key, and flash memory. The far-field voice module is connected to the processor via a PDM interface. Users can adjust the audio volume using the far-field voice module or the volume control key. The flash memory is used to store the correspondence between volume levels and the theoretical power amplifier supply voltage, as well as other system codes.

[0022] The Boost DC-DC circuit is as follows Figure 5As shown, the input power supply VDD_IN is filtered by a filter circuit consisting of capacitors C5 and C6 in parallel, reducing ripple and noise and providing a stable input to the IN pin of the boost DC-DC circuit. Resistors R5 and R6 form a voltage divider connected to the EN pin of the boost DC-DC chip DA2 to enable the chip. The IN pin of the boost DC-DC chip DA2 is connected to the node after the input voltage is filtered; the GND pin is grounded. Inductor L2 has one end connected to the DA2 input IN pin and one end connected to the DA2 SW pin and the anode of diode VD1. During the boost process, L2 stores energy and releases it to the load during the switching cycle. Diode VD1 is a Schottky diode, with its anode connected to the other end of L2 and its cathode connected to the output. Diode VD1 provides rectification and provides a current path when the switch is off, ensuring the efficient transfer of stored energy in the inductor, avoiding unnecessary energy loss and protecting the circuit from reverse current. The output stage circuit node is connected to a voltage divider circuit composed of resistors R1 and R2, and the voltage divider point is connected to the FB pin of the chip DA2, which is used to feedback the output voltage information and adjust the output. In addition, a PWM signal is connected to an RC circuit through resistors R4, R3 and capacitor C3 (one end of R4 is connected to the PWM signal, and the other end is connected to the connection point of R3 and C3; the other end of R3 is connected to the voltage divider circuit node; the other end of C3 is grounded), which participates in the control and regulation of the output voltage. Output filter capacitors C8 and C9 are connected in parallel at the output end to further filter out the low-frequency ripple in the output voltage and ensure the stability of the output voltage. C7 and R7 form a Snubber circuit connected between SW and the output end (in parallel with diode VD1) to reduce electromagnetic interference. C2 is connected between the negative pole of VD1 and FB to improve the output dynamic response speed. In this embodiment, a sound system powered by a 5V PSU and a lithium battery, with an amplifier in PBTL (Parallel Bridge Tied Load) mode, MONO output, a maximum power of 16W (4Ω load), and far-field voice control is used as an example to illustrate the method of reducing sound energy consumption by dynamically adjusting the power supply voltage according to the present invention.

[0023] like Figure 1 and Figure 2 As shown, the design ideas of the method for reducing audio energy consumption based on dynamic adjustment of power supply voltage described in the present invention are as follows: Step 1: Determine product requirements, such as speaker impedance and output power, number of speakers (MONO, Stereo, 5.1 channels, etc.), and determine hardware solution selection.

[0024] Step 2: Define the volume adjustment levels and use the AP device to test the output power corresponding to each volume setting. For example, 100% volume corresponds to 16W output power.

[0025] Step 3: Determine the theoretical power supply voltage Vpvdd based on the theoretical calculation of the voltage-power relationship of the power amplifier. The theoretical calculation formula of Vpvdd is as follows: , is the rated power at the corresponding volume level, is the power amplifier efficiency factor, is the speaker impedance. The theoretical calculation formula is used to obtain the theoretical power supply voltage value corresponding to each output power level, that is, the theoretical power supply voltage value corresponding to each volume level. Figure 3 Use the power amplifier power and voltage curve shown in the figure to determine the value of Vpvdd. For example, when the output power is 16W and THD ≤ 1%, the corresponding theoretical supply voltage is 12V. The theoretical supply voltage corresponding to other power levels can be determined similarly.

[0026] Step 4: According to the supply voltage requirements of each level, match the parameter values ​​of the boost DC-DC circuit's voltage regulating upper resistor R2, lower resistor R1, and RC circuit.

[0027] In this embodiment, R2 = 82kΩ, R1 = 6.81kΩ, R3 = 18.2kΩ, R4 = 20kΩ, and C1 = 100nF / 16V. The PWM frequency is adjustable from 10kHz to 500kHz.

[0028] Calculate the following formula Figure 5 The Boost DC-DC circuit shown below outputs the PWM duty cycle corresponding to the theoretical supply voltage: Vout=(1+R2 / R1)×Vref+R2×(Vref-Vpwm) / (R3+R4), where: reference voltage Vref=0.8V, pulse width modulation signal voltage Vpwm=D×Vhigh, D is the duty cycle, and PWM signal high level voltage Vhigh=3.3V.

[0029] According to the above formula, when the output Vout is 12V, its corresponding duty cycle is 0. Similarly, the duty cycles corresponding to other theoretical power supply voltage outputs can be calculated.

[0030] Step 5: Based on the above calculations, the corresponding table between volume level, output power, theoretical supply voltage and duty cycle is obtained as shown in Table 1: Table 1 Volume level, output power, theoretical supply voltage, and duty cycle Step 6: storing the correspondence table between the volume level, output power, actual supply voltage and duty cycle in a memory of the audio system; Step 7: After the user sets the volume level using the volume adjustment keys Vol- / Vol+ or far-field voice, the processor controls and adjusts the PWM duty cycle to achieve low-latency regulation of the output voltage of the Boost DC-DC circuit; Step 8: Dynamically adjust the audio power supply voltage to optimize sound quality, reduce energy consumption, and increase lithium battery life.

Claims

1. A method for reducing audio energy consumption based on dynamic adjustment of power supply voltage, characterized in that: The method comprises: Measure the power amplifier output power corresponding to each volume level, and calculate the theoretical power supply voltage corresponding to each volume level based on the power amplifier output power; Based on the calculation results, the corresponding relationship between the volume level and the theoretical power supply voltage of the power amplifier is established; After the user sets the volume level, the actual power supply voltage of the power amplifier is adjusted to the corresponding theoretical power supply voltage according to the corresponding relationship between the volume level and the theoretical power supply voltage of the power amplifier.

2. The method for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 1, characterized in that: The calculation method of the power amplifier theoretical supply voltage is: , The theoretical power supply voltage for the power amplifier, is the output power of the amplifier corresponding to the corresponding volume level. is the power amplifier efficiency factor, is the speaker impedance.

3. The method for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 1, characterized in that: The output voltage of the Boost DC-DC is adjusted by controlling PWM to dynamically power the power amplifier.

4. The method for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 3, characterized in that: The correspondence between the power amplifier output power, theoretical power supply voltage, and PWM corresponding to the theoretical power supply voltage corresponding to each volume level is stored in the memory of the audio system. After the user sets the volume level, the processor adjusts the actual power supply voltage of the power amplifier to the theoretical power supply voltage under the corresponding volume level by adjusting the PWM of the power amplifier input voltage according to the correspondence.

5. The method for reducing audio energy consumption by dynamically adjusting the power supply voltage according to any one of claims 1 to 4, characterized in that: Use the setting button to adjust the audio volume level.

6. The method for reducing audio energy consumption by dynamically adjusting the power supply voltage according to any one of claims 1 to 4, characterized in that: Adjust the audio volume level through the far-field voice function.

7. A system for reducing audio energy consumption based on dynamically adjusting the power supply voltage, for implementing the method for reducing audio energy consumption based on dynamically adjusting the power supply voltage as claimed in any one of claims 1 to 6, characterized in that: The system includes: a processor, an AC-DC power supply module, a charging management chip, a Boost DC-DC circuit, a memory, a power amplifier and a speaker; The AC-DC power supply module is connected to the input end of the Boost DC-DC circuit through the charging management chip, and the output end of the Boost DC-DC circuit is connected to the power amplifier to supply power to the power amplifier. The processor is connected to the power amplifier and the speaker respectively. The theoretical power supply voltage corresponding to each volume level is stored in the memory. The processor is used to adjust the actual output voltage of the Boost DC-DC to the theoretical power supply voltage according to the theoretical power supply voltage corresponding to each volume level stored in the memory, and drive the speaker to produce sound.

8. The system for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 7, characterized in that: The processor adjusts the actual power supply voltage of the power amplifier to the theoretical power supply voltage under the corresponding volume level by adjusting the PWM of the power amplifier input voltage.

9. The system for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 7, characterized in that: The system also includes a far-field voice module, which is connected to the processor via the PDM and is used to adjust the volume level of the audio through far-field voice.

10. The system for reducing audio energy consumption based on dynamic adjustment of power supply voltage according to claim 7, characterized in that: The system further comprises a volume adjustment key, which is used to adjust the volume level of the audio system through key input.

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