Split Audio Amplifier Circuit for Low-Battery UVLO Stability
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Solution Overview
Problem
Existing audio amplification systems in mobile devices face reliability issues when battery power is low, leading to power supply voltage drops below the under voltage lock out (UVLO) threshold, resulting in reset and increased power loss due to the use of boost circuits.
Innovation Solution
An audio amplification circuit is designed with a boost module and an audio amplifier, where the boost module boosts the voltage signal when it falls below a preset value, ensuring stable operation of the pre-module while the post-module remains powered by the supply, reducing current flow through the boost module and associated power loss.
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, 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 modules: pre-module and post-module. The boost module is connected only to the pre-module, not in series with the entire audio amplifier. This segmentation allows the boost function to be applied selectively to only the portion needing voltage boosting, reducing overall power loss while maintaining audio amplifier stability.
2Reliability
If the power supply voltage drops below the UVLO voltage, then the audio amplifier is reset, but reliability is reduced
Solution Approach 1:
The boost module proactively boosts the voltage signal before it reaches the pre-module, ensuring that the pre-module always receives sufficient voltage even when the power supply voltage drops below UVLO. This preliminary voltage boosting action prevents the audio amplifier from being reset and maintains continuous operation.
3Stability of the object's composition
If a boost module is added to ensure stable operation at low voltage, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The boost module serves as an intermediary component between the power supply and the pre-module. It mediates the voltage signal, boosting it only when necessary and only for the pre-module, rather than requiring a complex full-system voltage regulation solution. This reduces overall circuit complexity while maintaining voltage stability.
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 proposed solution ensures stable audio amplification at low voltage levels while minimizing power loss, outperforming traditional methods by reducing current through the boost module and maintaining high power output efficiency.
Implementation Method 1
the boost module boosts the voltage signal when it falls below a preset value
Data Source
AI summary
Provided are an audio amplification circuit, a board, and an electronic device. The circuit includes: a boost circuit and an audio amplifier, where the audio amplifier includes a pre-module and a post-module; an input end of the boost circuit is connected to a power supply, an output end of the boost circuit 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 circuit 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.