Class G Amplifier Power Supply With Predictive Voltage Modes
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Solution Overview
Problem
Conventional Class G amplifiers face challenges in optimizing power dissipation and efficiency due to the complexity and reliability issues associated with multiple power supplies, as well as the risk of distortion and efficiency degradation from improper switching between supply rails.
Innovation Solution
A Class G control circuit and regulator system that uses a multi-mode buck charge pump and inverting charge pump to dynamically adjust power supply voltages based on anticipated signal conditions, minimizing the number of switches and optimizing voltage modes to prevent clipping and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple power supplies are used to optimize power dissipation at lower voltages, then power efficiency is improved, but device complexity and reliability deteriorate
Solution Approach 1:
The patent combines multiple power supply functions into a single regulator that can dynamically switch between different voltage modes. Instead of using separate power supply circuits for each voltage level, the invention merges them into one integrated regulator that provides both lower and higher voltage rails as needed, reducing component count while maintaining power efficiency benefits
Solution Approach 2:
The patent implements dynamic voltage switching where the regulator automatically transitions between different power supply modes based on real-time signal conditions. The controller monitors the input signal and dynamically adjusts the power rail configuration, switching between lower voltage (for efficiency) and higher voltage (for headroom) modes, thereby optimizing power dissipation without requiring multiple static power supplies
2Adaptability or versatility
If the device operates from the higher supply rail for extended periods, then voltage headroom is improved, but power dissipation increases
Solution Approach 1:
The regulator dynamically adjusts the power supply voltage based on the instantaneous signal requirements. When the signal amplitude is low, the system operates from the lower voltage rail to minimize power dissipation. When the signal requires higher headroom to avoid clipping, the controller switches to the higher voltage rail. This dynamic adaptation ensures voltage flexibility is provided only when necessary, thereby reducing overall power dissipation
Solution Approach 2:
The system changes the operating voltage parameter in response to signal conditions. The controller monitors signal amplitude and dynamically adjusts the power rail voltage level, transitioning between lower and higher voltage states. This parameter change allows the system to maintain adequate voltage headroom for signal fidelity while minimizing power dissipation during low-signal conditions
3Reliability
If switching between supply rails is delayed, then distortion due to clipping is reduced, but efficiency deteriorates
Solution Approach 1:
The controller anticipates signal conditions and proactively switches between voltage rails before clipping occurs. By monitoring the input signal in advance and predicting when higher headroom will be needed, the system performs the voltage switch preliminarily, ensuring smooth transition and avoiding distortion. This preliminary action allows efficient operation at lower voltages to be maintained longer while still preventing clipping when needed
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 effectively reduces power dissipation, minimizes component count, and improves reliability by anticipating signal demands and adjusting power supply voltages, thereby enhancing the overall efficiency and reducing distortion in Class G amplifiers.
Implementation Method 1
A Class G control circuit and regulator system that uses a multi-mode buck charge pump and inverting charge pump to dynamically adjust power supply voltages
Data Source
AI summary
A Class G amplifier system including a processing unit configured to receive an input signal and output a delayed processed input signal, a class G amplifier configured to receive the delayed processed input signal, and a power supply. The power supply includes a regulator configured to operate in a plurality of configurations, each configuration outputs a different supply voltage to the class G amplifier and a control circuit configured to receive the input signal and determine the supply voltage required from the regulator when the delayed processed input signal is received at the class G amplifier, and output a signal to the regulator to indicate the required configuration for the required supply voltage.