Class-G Amplifier Rail Switching for Variable-Impedance Loads
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Solution Overview
Problem
Programmable controllers face challenges in efficiently driving loads with varying impedance values, leading to high power dissipation and cooling issues, especially when multiple channels are used, due to the inability to adequately manage power supply based on load impedance.
Innovation Solution
The implementation of a Class-G amplifier that selects one of multiple power supply rails based on the voltage across the load to minimize power dissipation, allowing it to drive loads with a wide range of impedance values efficiently, while sharing power supplies among multiple channels to reduce system complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed power supply voltage is used to drive loads with varying impedance, then the system is simple to operate, but power dissipation increases significantly
Solution Approach 1:
The patent implements a Class-G amplifier that dynamically switches between multiple power supply voltage levels (e.g., ±15V, ±12V, ±10V, ±5V) based on the instantaneous amplitude of the output signal. This dynamic adaptation allows the amplifier to use lower voltage levels for small signals, significantly reducing power dissipation, while maintaining the ability to handle large signals with higher voltage levels when needed.
2Adaptability or versatility
If multiple output channels are supported, then the system versatility increases, but power dissipation and cooling requirements increase
Solution Approach 1:
The patent segments the power supply system into multiple discrete voltage levels, allowing each output channel to independently select from these segmented power levels based on signal requirements. This segmentation enables multiple channels to share a common power supply infrastructure while each channel optimizes its power consumption individually, reducing total power dissipation across the system.
3Device complexity
If a single high-power power supply is used to support multiple channels, then the system complexity is reduced, but the system size and cooling requirements increase
Solution Approach 1:
The patent creates a universal power supply system where a single multi-rail power supply unit serves multiple output channels simultaneously. Each channel can draw from any combination of the available voltage rails, making the power supply system multi-functional and adaptable to various channel configurations. This approach reduces overall system size compared to having separate power supplies for each channel, while the modular rail structure keeps the design manageable.
4Power
If higher power supply voltage is used to drive low-impedance loads, then the power delivery capability is improved, but power dissipation in the amplifier increases
Solution Approach 1:
The patent changes the operating voltage parameter of the amplifier based on the load impedance and signal requirements. By providing multiple discrete voltage levels and enabling dynamic switching between them, the system optimizes the voltage parameter to match actual demands, delivering high power when needed for low-impedance loads while minimizing power dissipation during normal operation with higher-impedance loads or smaller signal amplitudes.
Data Source
AI summary
A method for providing an analog output signal includes (a) amplifying an analog first internal signal using a first Class-G amplifier to generate an analog first output signal, (b) providing the analog first output signal to a first load, and (c) configuring the first Class-G amplifier for an impedance of the first load by selecting one of a plurality of power supply rails to power the first Class-G amplifier at least partially based on a voltage across the first load. In some embodiments, an impedance of the first load may range from zero to 1,000 ohms.