Load-Adaptive Class-G Amplifier With Impedance-Based Rail Switching
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Solution Overview
Problem
Conventional class-G amplifiers experience increased power loss and consumption when operating under light load conditions due to high voltage rail switching frequency and larger voltage rail differences, making them inefficient for applications with lower output current and higher output impedance.
Innovation Solution
A class-G amplifier with an impedance detector and power source that adjusts the level and switching frequency of the supply voltage based on output impedance, using a hold time mechanism to optimize power consumption by selecting appropriate voltage rails and adjusting switching frequencies accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional rail switching mechanism is used in class-G amplifier, then power consumption is reduced under heavy load conditions, but power loss increases under light load conditions due to high voltage rail switching frequency and larger voltage rail differences
Solution Approach 1:
The patent implements dynamic adjustment of voltage rail levels and switching frequency based on detected output impedance. The power source dynamically changes the number of voltage rails and their levels according to load conditions, transitioning from fixed conventional rails to adaptive dynamic rails that optimize power efficiency across different operating conditions.
Solution Approach 2:
The patent changes key parameters including voltage rail levels, number of voltage rails, and switching frequency based on detected output impedance. The system adjusts these parameters dynamically - using higher voltage rails for heavy loads and lower voltage rails for light loads - to optimize the balance between power consumption and power loss.
2Speed
If high voltage rail switching frequency is used to improve response speed, then voltage rail adjustment becomes faster, but power loss increases due to frequent switching
Solution Approach 1:
The switching frequency is dynamically adjusted based on output impedance detection. For light load conditions, the system uses lower switching frequency to reduce power loss from frequent switching. For heavy load conditions, higher switching frequency is applied to maintain fast response. This dynamic frequency adjustment resolves the contradiction between speed and energy loss.
Solution Approach 2:
The patent implements periodic impedance detection and corresponding periodic adjustment of voltage rail switching frequency. The system continuously monitors output impedance and adjusts switching parameters in periodic cycles, optimizing the balance between response speed and power loss through rhythmic adaptation to changing load conditions.
Data Source
AI summary
The present invention provides a class-G amplifier, wherein the class-G amplifier includes an amplifier stage, an impedance detector and a power source. In the operations of the class-G amplifier, the amplifier stage is supplied by a supply voltage, and amplifies an input audio signal to generate an output audio signal, and the impedance detector is configured to detect an output impedance of the amplifier stage to generate a detection result, and the power source refers to the detection result to determine a level and a switching frequency of the supply voltage.