Adaptive Power Supply Circuit for Audio Amplifier Loss Reduction
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Solution Overview
Problem
Existing audio power amplifiers face inefficiencies due to constant power supply voltage, leading to increased conduction and driving losses when output power is low, reducing overall efficiency.
Innovation Solution
A power supply circuit that detects the output power of an audio power amplifier and adjusts the power supply voltage accordingly, selecting a target reference voltage range from multiple predetermined ranges to match the output power, thereby reducing current flow and conduction loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a constant power supply voltage is used to ensure sufficient output power capability, then the audio power amplifier can deliver high output power when needed, but conduction loss and driving loss increase when output power is low, reducing overall efficiency
Solution Approach 1:
The power supply voltage is changed from a constant value to a dynamically adjustable value that adapts to the actual output power requirements. The controller adjusts the power supply voltage in real-time based on the relationship between output power and efficiency, ensuring the amplifier operates at high efficiency across different power levels while maintaining the capability to deliver high output power when needed.
Solution Approach 2:
The power supply voltage parameter is changed from a fixed constant to a variable parameter that can be adjusted according to the actual operating conditions. By changing the voltage level dynamically based on the output power requirements, the system achieves optimal efficiency at different power levels while preserving high power capability when required.
2Device complexity
If a constant power supply voltage is used to simplify the power supply circuit design, then the circuit structure remains simple, but the working efficiency decreases due to increased current flow and conduction loss at low output power
Solution Approach 1:
The power supply system transitions from a static constant voltage design to a dynamic adjustable voltage design. The controller modifies the power supply voltage in real-time according to the actual output power needs, achieving high working efficiency across different operating conditions while adding only minimal control circuitry complexity.
Solution Approach 2:
A feedback mechanism is introduced where the controller monitors the output power level and adjusts the power supply voltage accordingly. This closed-loop control ensures the amplifier operates at optimal efficiency by matching the power supply voltage to the actual power requirements, significantly improving working efficiency without substantially increasing circuit complexity.
3Power
If the power supply voltage is increased to boost output signal amplitude and output power, then the output power capability is enhanced, but the current flow increases leading to higher conduction loss and reduced power supply efficiency
Solution Approach 1:
The power supply voltage is made dynamically adjustable rather than fixed at a high constant value. The controller adjusts the voltage level in real-time based on the actual output power requirements, ensuring high output power capability when needed while minimizing current flow and conduction loss during low-power operation, thereby maintaining high power supply efficiency across all operating conditions.
Solution Approach 2:
The power supply voltage parameter is transformed from a fixed high value to a variable parameter that can be adjusted according to actual needs. By changing the voltage level dynamically, the system achieves optimal balance between output power capability and power supply efficiency, reducing unnecessary current flow and conduction loss while preserving the ability to deliver high output power when required.
Data Source
AI summary
Disclosed are a power supply circuit, power supply method, audio power amplifier and integrated circuit. The power supply circuit applied to an audio power amplifier may include: a measurement sub-circuit used for measuring a voltage of an audio signal input to the audio power amplifier, which corresponds to output power of the audio power amplifier; a control sub-circuit used for determining a target reference voltage range according to a voltage range of the audio signal within a predetermined time period, which is selected from a plurality of predetermined reference voltage ranges, wherein the voltage range of audio signal within the predetermined time period is included in the target reference voltage range; and a power supply sub-circuit used for generating, based on the target reference voltage range, a power supply voltage that matches the output power of the audio power amplifier, so as to supply power to the audio power amplifier.