Dual-Rail Audio Amplifier Circuit for Low-Voltage Power Loss Reduction
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Solution Overview
Problem
Existing audio amplifiers in mobile devices experience reduced reliability and increased power loss when the power supply voltage drops below the under voltage lock out (UVLO) threshold, necessitating a boost circuit that causes significant power consumption.
Innovation Solution
An audio amplification circuit with a boost module and dual-rail power supply, where the boost module boosts the input voltage when it falls below a preset value, ensuring stable operation of the pre-module while minimizing power loss by separating high-power and low-power channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a boost circuit is connected in series with the power supply end to increase the voltage value of the input voltage of the audio amplifier, then the audio amplifier can work at low voltage, but a relatively large power loss is caused
Solution Approach 1:
The audio amplifier is divided into two independent power supply channels: a first power supply channel for the pre-module and a second power supply channel for the post-module. The boost module is only connected in series with the first power supply channel, segmenting the power supply system to minimize the impact of voltage boosting on overall power consumption.
Solution Approach 2:
The boost module is selectively applied only to the pre-module's power supply channel rather than the entire audio amplifier system. This local application of voltage boosting ensures that only the necessary portion receives enhanced voltage, reducing unnecessary power loss in the post-module that can operate directly from the battery.
2Reliability
If the power supply voltage drops below the UVLO voltage of the audio amplifier, then the audio amplifier is reset, but reliability of the audio amplifier is reduced
Solution Approach 1:
The boost module proactively boosts the voltage of the first power supply channel before the voltage drops below the UVLO threshold of the audio amplifier. This preliminary voltage enhancement prevents the amplifier from entering reset state, ensuring continuous stable operation without frequent resets.
Solution Approach 2:
The boost module acts as a protective buffer that compensates for battery voltage drops in advance. By maintaining the voltage of the first power supply channel above the UVLO threshold even when battery voltage sags, it cushions the audio amplifier against voltage-related resets and instability.
3Reliability
If a boost module is connected in series with the power supply to ensure stable work at low voltage, then the audio amplifier can work at low voltage, but current consumption increases
Solution Approach 1:
The power supply system is segmented into two independent channels with different voltage management strategies. The first channel uses the boost module for low-voltage compensation, while the second channel draws power directly from the battery, dividing the energy burden and reducing overall current consumption compared to a single-series-boost configuration.
Solution Approach 2:
The system dynamically changes the voltage parameter of the first power supply channel through the boost module when battery voltage drops, while maintaining the second channel at nominal battery voltage. This selective parameter adjustment allows stable operation at low battery voltage without continuously increasing current consumption across the entire system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution maintains stable audio amplifier operation at low voltages with reduced power loss by using a dual-rail power supply, ensuring efficient power output and protecting the amplifier from voltage drops.
Implementation Method 1
the boost module is configured to boost a first voltage signal when a voltage value of the received first voltage signal of the power supply is less than a first preset voltage value to obtain a second voltage signal whose voltage value is a second preset voltage value
Data Source
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AI summary
Provided are an audio amplification circuit, a board, and an electronic device. The circuit includes: a boost module and an audio amplifier, where the audio amplifier includes a pre-module and a post-module; an input end of the boost module is connected to a power supply, an output end of the boost module is connected to an input end of the pre-module, and an input end of the post-module is connected to the power supply; the boost module is configured to boost a first voltage signal when a voltage value of the received first voltage signal of the power supply is less than a first preset voltage value to obtain a second voltage signal whose voltage value is a second preset voltage value, and send the second voltage signal to the input end of the pre-module, where the second preset voltage value is not less than the first preset voltage value. A power loss is reduced by using the circuit.