Tracking Power Supply Audio Amplifiers for Low-Heat Vehicle Audio
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Solution Overview
Problem
Audio power amplifiers in vehicle-mounted systems face inefficiencies, leading to high power consumption and heat dissipation, while requiring a balance between power supply voltage and output signal quality to avoid clipping and distortion.
Innovation Solution
An audio system incorporating a target audio signal generator module, tracking power supply circuit module, and audio power amplifier module, where the tracking power supply circuits generate power supply voltages based on target audio signals to adaptively power audio power amplifiers, reducing power consumption and heat dissipation by optimizing power supply voltage according to audio signal amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high power supply voltage is used to ensure good audio output quality and avoid clipping, then the audio output quality is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic power supply voltage adjustment by introducing a tracking power supply circuit that dynamically changes the power supply voltage based on the instantaneous amplitude of the audio signal. The power supply voltage tracks the signal envelope, providing high voltage only when needed for signal peaks, and reducing voltage during low-signal periods, thus resolving the contradiction between maintaining audio quality and reducing power consumption
Solution Approach 2:
The patent changes the power supply voltage parameter dynamically rather than using a fixed high voltage. The tracking power supply circuit continuously adjusts the voltage parameter according to the audio signal characteristics, allowing the system to operate with optimal voltage levels that adapt to signal requirements, thereby reducing overall power consumption while maintaining output quality
2Power
If a high power supply voltage is used to drive the power amplifier, then the audio output power is improved, but the heat dissipation increases
Solution Approach 1:
The tracking power supply circuit dynamically adjusts the power supply voltage to match the instantaneous signal requirements, providing high voltage only during signal peaks when high output power is needed, and reducing voltage during low-signal periods. This dynamic adjustment reduces the average power dissipation and heat generation while maintaining the ability to deliver high peak output power when required
Solution Approach 2:
The patent converts the potentially harmful effect of continuous high voltage operation (excessive heat dissipation) into a beneficial dynamic tracking system that provides high voltage only when necessary. The tracking mechanism transforms the static harmful high-voltage state into a dynamic system that delivers high power when needed while minimizing heat generation during low-signal periods
3Use of energy by moving object
If a low power supply voltage is used to reduce power consumption, then the power efficiency is improved, but the audio output quality deteriorates due to clipping and distortion
Solution Approach 1:
The tracking power supply circuit provides dynamic voltage adjustment that ensures sufficient voltage is available during signal peaks to prevent clipping and distortion, while reducing voltage during low-signal periods to improve power efficiency. This dynamic tracking approach maintains audio quality by providing adequate voltage when needed without the continuous high voltage that would be required in a static system
Solution Approach 2:
The patent changes the power supply voltage parameter from a fixed low value to a dynamically adjusted value that tracks the signal envelope. This parameter change allows the system to operate at low voltage during most of the time (improving efficiency) while temporarily increasing voltage during signal peaks (maintaining quality), thus resolving the contradiction between power efficiency and audio output quality
4Reliability
If a fixed high power supply voltage is used, then the audio output quality is maintained, but the power loss increases
Solution Approach 1:
The tracking power supply circuit replaces the fixed high voltage approach with a dynamic voltage tracking system that adjusts the power supply voltage to match the instantaneous signal amplitude. This dynamic approach maintains audio output quality by providing high voltage during signal peaks while reducing voltage during low-signal periods, thereby significantly reducing the average power loss compared to continuous high voltage operation
Data Source
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AI summary
The present disclosure provides an audio system. The audio system includes: a target audio signal generator module including a plurality of target audio signal generators, configured to receive an audio signal and a tracking signal and generate a plurality of target audio signals based on the audio signal and tracking signal; a tracking power supply circuit module including a plurality of tracking power supply circuits, configured to receive the plurality of target audio signals and generate a plurality of power supply voltages based on the plurality of target audio signals; an audio power amplifying circuit module including a plurality of audio amplifying circuits, configured to receive the plurality of target audio signals and the plurality of power supply voltages, and amplify the plurality of target audio signals; wherein each of the plurality of tracking power supply circuits provides a corresponding power supply voltage for each of the plurality of audio amplifying circuits.